1 /*
   2  * Copyright (c) 1997, 2019, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_aarch64
  44 # include "globals_aarch64.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_sparc
  47 # include "globals_sparc.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_zero
  50 # include "globals_zero.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_arm
  53 # include "globals_arm.hpp"
  54 #endif
  55 #ifdef TARGET_ARCH_ppc
  56 # include "globals_ppc.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_linux
  59 # include "globals_linux.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_solaris
  62 # include "globals_solaris.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_windows
  65 # include "globals_windows.hpp"
  66 #endif
  67 #ifdef TARGET_OS_FAMILY_aix
  68 # include "globals_aix.hpp"
  69 #endif
  70 #ifdef TARGET_OS_FAMILY_bsd
  71 # include "globals_bsd.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_x86
  74 # include "globals_linux_x86.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_linux_aarch64
  77 # include "globals_linux_aarch64.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_linux_sparc
  80 # include "globals_linux_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_linux_zero
  83 # include "globals_linux_zero.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_solaris_x86
  86 # include "globals_solaris_x86.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_solaris_sparc
  89 # include "globals_solaris_sparc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_windows_x86
  92 # include "globals_windows_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_linux_arm
  95 # include "globals_linux_arm.hpp"
  96 #endif
  97 #ifdef TARGET_OS_ARCH_linux_ppc
  98 # include "globals_linux_ppc.hpp"
  99 #endif
 100 #ifdef TARGET_OS_ARCH_aix_ppc
 101 # include "globals_aix_ppc.hpp"
 102 #endif
 103 #ifdef TARGET_OS_ARCH_bsd_x86
 104 # include "globals_bsd_x86.hpp"
 105 #endif
 106 #ifdef TARGET_OS_ARCH_bsd_zero
 107 # include "globals_bsd_zero.hpp"
 108 #endif
 109 #ifdef COMPILER1
 110 #ifdef TARGET_ARCH_x86
 111 # include "c1_globals_x86.hpp"
 112 #endif
 113 #ifdef TARGET_ARCH_aarch64
 114 # include "c1_globals_aarch64.hpp"
 115 #endif
 116 #ifdef TARGET_ARCH_sparc
 117 # include "c1_globals_sparc.hpp"
 118 #endif
 119 #ifdef TARGET_ARCH_arm
 120 # include "c1_globals_arm.hpp"
 121 #endif
 122 #ifdef TARGET_ARCH_ppc
 123 # include "c1_globals_ppc.hpp"
 124 #endif
 125 #ifdef TARGET_OS_FAMILY_linux
 126 # include "c1_globals_linux.hpp"
 127 #endif
 128 #ifdef TARGET_OS_FAMILY_solaris
 129 # include "c1_globals_solaris.hpp"
 130 #endif
 131 #ifdef TARGET_OS_FAMILY_windows
 132 # include "c1_globals_windows.hpp"
 133 #endif
 134 #ifdef TARGET_OS_FAMILY_aix
 135 # include "c1_globals_aix.hpp"
 136 #endif
 137 #ifdef TARGET_OS_FAMILY_bsd
 138 # include "c1_globals_bsd.hpp"
 139 #endif
 140 #endif
 141 #ifdef COMPILER2
 142 #ifdef TARGET_ARCH_x86
 143 # include "c2_globals_x86.hpp"
 144 #endif
 145 #ifdef TARGET_ARCH_aarch64
 146 # include "c2_globals_aarch64.hpp"
 147 #endif
 148 #ifdef TARGET_ARCH_sparc
 149 # include "c2_globals_sparc.hpp"
 150 #endif
 151 #ifdef TARGET_ARCH_arm
 152 # include "c2_globals_arm.hpp"
 153 #endif
 154 #ifdef TARGET_ARCH_ppc
 155 # include "c2_globals_ppc.hpp"
 156 #endif
 157 #ifdef TARGET_OS_FAMILY_linux
 158 # include "c2_globals_linux.hpp"
 159 #endif
 160 #ifdef TARGET_OS_FAMILY_solaris
 161 # include "c2_globals_solaris.hpp"
 162 #endif
 163 #ifdef TARGET_OS_FAMILY_windows
 164 # include "c2_globals_windows.hpp"
 165 #endif
 166 #ifdef TARGET_OS_FAMILY_aix
 167 # include "c2_globals_aix.hpp"
 168 #endif
 169 #ifdef TARGET_OS_FAMILY_bsd
 170 # include "c2_globals_bsd.hpp"
 171 #endif
 172 #endif
 173 #ifdef SHARK
 174 #ifdef TARGET_ARCH_zero
 175 # include "shark_globals_zero.hpp"
 176 #endif
 177 #endif
 178 
 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 180 define_pd_global(bool, BackgroundCompilation,        false);
 181 define_pd_global(bool, UseTLAB,                      false);
 182 define_pd_global(bool, CICompileOSR,                 false);
 183 define_pd_global(bool, UseTypeProfile,               false);
 184 define_pd_global(bool, UseOnStackReplacement,        false);
 185 define_pd_global(bool, InlineIntrinsics,             false);
 186 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 187 define_pd_global(bool, ProfileInterpreter,           false);
 188 define_pd_global(bool, ProfileTraps,                 false);
 189 define_pd_global(bool, TieredCompilation,            false);
 190 
 191 define_pd_global(intx, CompileThreshold,             0);
 192 define_pd_global(intx, BackEdgeThreshold,            0);
 193 
 194 define_pd_global(intx, OnStackReplacePercentage,     0);
 195 define_pd_global(bool, ResizeTLAB,                   false);
 196 define_pd_global(intx, FreqInlineSize,               0);
 197 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 198 define_pd_global(intx, InlineClassNatives,           true);
 199 define_pd_global(intx, InlineUnsafeOps,              true);
 200 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 201 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 202 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 203 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 204 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 205 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 206 define_pd_global(bool, NeverActAsServerClassMachine, true);
 207 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 208 #define CI_COMPILER_COUNT 0
 209 #else
 210 
 211 #ifdef COMPILER2
 212 #define CI_COMPILER_COUNT 2
 213 #else
 214 #define CI_COMPILER_COUNT 1
 215 #endif // COMPILER2
 216 
 217 #endif // no compilers
 218 
 219 #if !INCLUDE_JFR
 220 #define LogJFR false
 221 #endif
 222 
 223 // string type aliases used only in this file
 224 typedef const char* ccstr;
 225 typedef const char* ccstrlist;   // represents string arguments which accumulate
 226 
 227 struct Flag {
 228   enum Flags {
 229     // value origin
 230     DEFAULT          = 0,
 231     COMMAND_LINE     = 1,
 232     ENVIRON_VAR      = 2,
 233     CONFIG_FILE      = 3,
 234     MANAGEMENT       = 4,
 235     ERGONOMIC        = 5,
 236     ATTACH_ON_DEMAND = 6,
 237     INTERNAL         = 7,
 238 
 239     LAST_VALUE_ORIGIN = INTERNAL,
 240     VALUE_ORIGIN_BITS = 4,
 241     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 242 
 243     // flag kind
 244     KIND_PRODUCT            = 1 << 4,
 245     KIND_MANAGEABLE         = 1 << 5,
 246     KIND_DIAGNOSTIC         = 1 << 6,
 247     KIND_EXPERIMENTAL       = 1 << 7,
 248     KIND_NOT_PRODUCT        = 1 << 8,
 249     KIND_DEVELOP            = 1 << 9,
 250     KIND_PLATFORM_DEPENDENT = 1 << 10,
 251     KIND_READ_WRITE         = 1 << 11,
 252     KIND_C1                 = 1 << 12,
 253     KIND_C2                 = 1 << 13,
 254     KIND_ARCH               = 1 << 14,
 255     KIND_SHARK              = 1 << 15,
 256     KIND_LP64_PRODUCT       = 1 << 16,
 257     KIND_COMMERCIAL         = 1 << 17,
 258 
 259     KIND_MASK = ~VALUE_ORIGIN_MASK
 260   };
 261 
 262   const char* _type;
 263   const char* _name;
 264   void* _addr;
 265   NOT_PRODUCT(const char* _doc;)
 266   Flags _flags;
 267 
 268   // points to all Flags static array
 269   static Flag* flags;
 270 
 271   // number of flags
 272   static size_t numFlags;
 273 
 274   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 275   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 276 
 277   void check_writable();
 278 
 279   bool is_bool() const;
 280   bool get_bool() const;
 281   void set_bool(bool value);
 282 
 283   bool is_intx() const;
 284   intx get_intx() const;
 285   void set_intx(intx value);
 286 
 287   bool is_uintx() const;
 288   uintx get_uintx() const;
 289   void set_uintx(uintx value);
 290 
 291   bool is_uint64_t() const;
 292   uint64_t get_uint64_t() const;
 293   void set_uint64_t(uint64_t value);
 294 
 295   bool is_double() const;
 296   double get_double() const;
 297   void set_double(double value);
 298 
 299   bool is_ccstr() const;
 300   bool ccstr_accumulates() const;
 301   ccstr get_ccstr() const;
 302   void set_ccstr(ccstr value);
 303 
 304   Flags get_origin();
 305   void set_origin(Flags origin);
 306 
 307   bool is_default();
 308   bool is_ergonomic();
 309   bool is_command_line();
 310 
 311   bool is_product() const;
 312   bool is_manageable() const;
 313   bool is_diagnostic() const;
 314   bool is_experimental() const;
 315   bool is_notproduct() const;
 316   bool is_develop() const;
 317   bool is_read_write() const;
 318   bool is_commercial() const;
 319 
 320   bool is_constant_in_binary() const;
 321 
 322   bool is_unlocker() const;
 323   bool is_unlocked() const;
 324   bool is_writeable() const;
 325   bool is_external() const;
 326 
 327   bool is_unlocker_ext() const;
 328   bool is_unlocked_ext() const;
 329   bool is_writeable_ext() const;
 330   bool is_external_ext() const;
 331 
 332   void unlock_diagnostic();
 333 
 334   void get_locked_message(char*, int) const;
 335   void get_locked_message_ext(char*, int) const;
 336 
 337   void print_on(outputStream* st, bool withComments = false );
 338   void print_kind(outputStream* st);
 339   void print_as_flag(outputStream* st);
 340 };
 341 
 342 // debug flags control various aspects of the VM and are global accessible
 343 
 344 // use FlagSetting to temporarily change some debug flag
 345 // e.g. FlagSetting fs(DebugThisAndThat, true);
 346 // restored to previous value upon leaving scope
 347 class FlagSetting {
 348   bool val;
 349   bool* flag;
 350  public:
 351   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 352   ~FlagSetting()                       { *flag = val; }
 353 };
 354 
 355 
 356 class CounterSetting {
 357   intx* counter;
 358  public:
 359   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 360   ~CounterSetting()         { (*counter)--; }
 361 };
 362 
 363 
 364 class UIntFlagSetting {
 365   uintx val;
 366   uintx* flag;
 367  public:
 368   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 369   ~UIntFlagSetting()                         { *flag = val; }
 370 };
 371 
 372 
 373 class DoubleFlagSetting {
 374   double val;
 375   double* flag;
 376  public:
 377   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 378   ~DoubleFlagSetting()                           { *flag = val; }
 379 };
 380 
 381 
 382 class CommandLineFlags {
 383  public:
 384   static bool boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false);
 385   static bool boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false)   { return boolAt(name, strlen(name), value, allow_locked, return_flag); }
 386   static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 387   static bool boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 388 
 389   static bool intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false);
 390   static bool intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false)      { return intxAt(name, strlen(name), value, allow_locked, return_flag); }
 391   static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 392   static bool intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 393 
 394   static bool uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false);
 395   static bool uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false)    { return uintxAt(name, strlen(name), value, allow_locked, return_flag); }
 396   static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 397   static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 398 
 399   static bool uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false);
 400   static bool uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); }
 401   static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 402   static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 403 
 404   static bool doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false);
 405   static bool doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false)    { return doubleAt(name, strlen(name), value, allow_locked, return_flag); }
 406   static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 407   static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 408 
 409   static bool ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false);
 410   static bool ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false)    { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); }
 411   // Contract:  Flag will make private copy of the incoming value.
 412   // Outgoing value is always malloc-ed, and caller MUST call free.
 413   static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 414   static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 415 
 416   // Returns false if name is not a command line flag.
 417   static bool wasSetOnCmdline(const char* name, bool* value);
 418   static void printSetFlags(outputStream* out);
 419 
 420   static void printFlags(outputStream* out, bool withComments);
 421 
 422   static void verify() PRODUCT_RETURN;
 423 };
 424 
 425 // use this for flags that are true by default in the debug version but
 426 // false in the optimized version, and vice versa
 427 #ifdef ASSERT
 428 #define trueInDebug  true
 429 #define falseInDebug false
 430 #else
 431 #define trueInDebug  false
 432 #define falseInDebug true
 433 #endif
 434 
 435 // use this for flags that are true per default in the product build
 436 // but false in development builds, and vice versa
 437 #ifdef PRODUCT
 438 #define trueInProduct  true
 439 #define falseInProduct false
 440 #else
 441 #define trueInProduct  false
 442 #define falseInProduct true
 443 #endif
 444 
 445 #ifdef JAVASE_EMBEDDED
 446 #define falseInEmbedded false
 447 #else
 448 #define falseInEmbedded true
 449 #endif
 450 
 451 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 452 // product flags are always settable / visible
 453 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 454 
 455 // A flag must be declared with one of the following types:
 456 // bool, intx, uintx, ccstr.
 457 // The type "ccstr" is an alias for "const char*" and is used
 458 // only in this file, because the macrology requires single-token type names.
 459 
 460 // Note: Diagnostic options not meant for VM tuning or for product modes.
 461 // They are to be used for VM quality assurance or field diagnosis
 462 // of VM bugs.  They are hidden so that users will not be encouraged to
 463 // try them as if they were VM ordinary execution options.  However, they
 464 // are available in the product version of the VM.  Under instruction
 465 // from support engineers, VM customers can turn them on to collect
 466 // diagnostic information about VM problems.  To use a VM diagnostic
 467 // option, you must first specify +UnlockDiagnosticVMOptions.
 468 // (This master switch also affects the behavior of -Xprintflags.)
 469 //
 470 // experimental flags are in support of features that are not
 471 //    part of the officially supported product, but are available
 472 //    for experimenting with. They could, for example, be performance
 473 //    features that may not have undergone full or rigorous QA, but which may
 474 //    help performance in some cases and released for experimentation
 475 //    by the community of users and developers. This flag also allows one to
 476 //    be able to build a fully supported product that nonetheless also
 477 //    ships with some unsupported, lightly tested, experimental features.
 478 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 479 //    UnlockExperimentalVMOptions flag, which allows the control and
 480 //    modification of the experimental flags.
 481 //
 482 // Nota bene: neither diagnostic nor experimental options should be used casually,
 483 //    and they are not supported on production loads, except under explicit
 484 //    direction from support engineers.
 485 //
 486 // manageable flags are writeable external product flags.
 487 //    They are dynamically writeable through the JDK management interface
 488 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 489 //    These flags are external exported interface (see CCC).  The list of
 490 //    manageable flags can be queried programmatically through the management
 491 //    interface.
 492 //
 493 //    A flag can be made as "manageable" only if
 494 //    - the flag is defined in a CCC as an external exported interface.
 495 //    - the VM implementation supports dynamic setting of the flag.
 496 //      This implies that the VM must *always* query the flag variable
 497 //      and not reuse state related to the flag state at any given time.
 498 //    - you want the flag to be queried programmatically by the customers.
 499 //
 500 // product_rw flags are writeable internal product flags.
 501 //    They are like "manageable" flags but for internal/private use.
 502 //    The list of product_rw flags are internal/private flags which
 503 //    may be changed/removed in a future release.  It can be set
 504 //    through the management interface to get/set value
 505 //    when the name of flag is supplied.
 506 //
 507 //    A flag can be made as "product_rw" only if
 508 //    - the VM implementation supports dynamic setting of the flag.
 509 //      This implies that the VM must *always* query the flag variable
 510 //      and not reuse state related to the flag state at any given time.
 511 //
 512 // Note that when there is a need to support develop flags to be writeable,
 513 // it can be done in the same way as product_rw.
 514 
 515 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 516                                                                             \
 517   lp64_product(bool, UseCompressedOops, false,                              \
 518           "Use 32-bit object references in 64-bit VM. "                     \
 519           "lp64_product means flag is always constant in 32 bit VM")        \
 520                                                                             \
 521   lp64_product(bool, UseCompressedClassPointers, false,                     \
 522           "Use 32-bit class pointers in 64-bit VM. "                        \
 523           "lp64_product means flag is always constant in 32 bit VM")        \
 524                                                                             \
 525   notproduct(bool, CheckCompressedOops, true,                               \
 526           "Generate checks in encoding/decoding code in debug VM")          \
 527                                                                             \
 528   product_pd(uintx, HeapBaseMinAddress,                                     \
 529           "OS specific low limit for heap base address")                    \
 530                                                                             \
 531   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 532           "Print compressed oops base address and encoding mode")           \
 533                                                                             \
 534   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 535           "Default object alignment in bytes, 8 is minimum")                \
 536                                                                             \
 537   product(bool, AssumeMP, false,                                            \
 538           "Instruct the VM to assume multiple processors are available")    \
 539                                                                             \
 540   /* UseMembar is theoretically a temp flag used for memory barrier         \
 541    * removal testing.  It was supposed to be removed before FCS but has     \
 542    * been re-added (see 6401008) */                                         \
 543   product_pd(bool, UseMembar,                                               \
 544           "(Unstable) Issues membars on thread state transitions")          \
 545                                                                             \
 546   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 547           "Clean the chunk pool asynchronously")                            \
 548                                                                             \
 549   /* Temporary: See 6948537 */                                              \
 550   experimental(bool, UseMemSetInBOT, true,                                  \
 551           "(Unstable) uses memset in BOT updates in GC code")               \
 552                                                                             \
 553   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 554           "Enable normal processing of flags relating to field diagnostics")\
 555                                                                             \
 556   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 557           "Enable normal processing of flags relating to experimental "     \
 558           "features")                                                       \
 559                                                                             \
 560   product(bool, JavaMonitorsInStackTrace, true,                             \
 561           "Print information about Java monitor locks when the stacks are"  \
 562           "dumped")                                                         \
 563                                                                             \
 564   product_pd(bool, UseLargePages,                                           \
 565           "Use large page memory")                                          \
 566                                                                             \
 567   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 568           "Allocate large pages individually for better affinity")          \
 569                                                                             \
 570   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 571           "Fail large pages individual allocation")                         \
 572                                                                             \
 573   product(bool, UseLargePagesInMetaspace, false,                            \
 574           "Use large page memory in metaspace. "                            \
 575           "Only used if UseLargePages is enabled.")                         \
 576                                                                             \
 577   develop(bool, TracePageSizes, false,                                      \
 578           "Trace page size selection and usage")                            \
 579                                                                             \
 580   product(bool, UseNUMA, false,                                             \
 581           "Use NUMA if available")                                          \
 582                                                                             \
 583   product(bool, UseNUMAInterleaving, false,                                 \
 584           "Interleave memory across NUMA nodes if available")               \
 585                                                                             \
 586   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 587           "Granularity to use for NUMA interleaving on Windows OS")         \
 588                                                                             \
 589   product(bool, ForceNUMA, false,                                           \
 590           "Force NUMA optimizations on single-node/UMA systems")            \
 591                                                                             \
 592   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 593           "Percentage (0-100) used to weigh the current sample when "       \
 594           "computing exponentially decaying average for "                   \
 595           "AdaptiveNUMAChunkSizing")                                        \
 596                                                                             \
 597   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 598           "Do not reallocate more than this amount per collection")         \
 599                                                                             \
 600   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 601           "Enable adaptive chunk sizing for NUMA")                          \
 602                                                                             \
 603   product(bool, NUMAStats, false,                                           \
 604           "Print NUMA stats in detailed heap information")                  \
 605                                                                             \
 606   product(uintx, NUMAPageScanRate, 256,                                     \
 607           "Maximum number of pages to include in the page scan procedure")  \
 608                                                                             \
 609   product_pd(bool, NeedsDeoptSuspend,                                       \
 610           "True for register window machines (sparc/ia64)")                 \
 611                                                                             \
 612   product(intx, UseSSE, 99,                                                 \
 613           "Highest supported SSE instructions set on x86/x64")              \
 614                                                                             \
 615   product(bool, UseAES, false,                                              \
 616           "Control whether AES instructions can be used on x86/x64")        \
 617                                                                             \
 618   product(bool, UseSHA, false,                                              \
 619           "Control whether SHA instructions can be used on SPARC")          \
 620                                                                             \
 621   product(bool, UseGHASHIntrinsics, false,                                  \
 622           "Use intrinsics for GHASH versions of crypto")                    \
 623                                                                             \
 624   product(uintx, LargePageSizeInBytes, 0,                                   \
 625           "Large page size (0 to let VM choose the page size)")             \
 626                                                                             \
 627   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 628           "Use large pages if maximum heap is at least this big")           \
 629                                                                             \
 630   product(bool, ForceTimeHighResolution, false,                             \
 631           "Using high time resolution (for Win32 only)")                    \
 632                                                                             \
 633   develop(bool, TraceItables, false,                                        \
 634           "Trace initialization and use of itables")                        \
 635                                                                             \
 636   develop(bool, TracePcPatching, false,                                     \
 637           "Trace usage of frame::patch_pc")                                 \
 638                                                                             \
 639   develop(bool, TraceJumps, false,                                          \
 640           "Trace assembly jumps in thread ring buffer")                     \
 641                                                                             \
 642   develop(bool, TraceRelocator, false,                                      \
 643           "Trace the bytecode relocator")                                   \
 644                                                                             \
 645   develop(bool, TraceLongCompiles, false,                                   \
 646           "Print out every time compilation is longer than "                \
 647           "a given threshold")                                              \
 648                                                                             \
 649   develop(bool, SafepointALot, false,                                       \
 650           "Generate a lot of safepoints. This works with "                  \
 651           "GuaranteedSafepointInterval")                                    \
 652                                                                             \
 653   product_pd(bool, BackgroundCompilation,                                   \
 654           "A thread requesting compilation is not blocked during "          \
 655           "compilation")                                                    \
 656                                                                             \
 657   product(bool, PrintVMQWaitTime, false,                                    \
 658           "Print out the waiting time in VM operation queue")               \
 659                                                                             \
 660   develop(bool, NoYieldsInMicrolock, false,                                 \
 661           "Disable yields in microlock")                                    \
 662                                                                             \
 663   develop(bool, TraceOopMapGeneration, false,                               \
 664           "Show OopMapGeneration")                                          \
 665                                                                             \
 666   product(bool, MethodFlushing, true,                                       \
 667           "Reclamation of zombie and not-entrant methods")                  \
 668                                                                             \
 669   develop(bool, VerifyStack, false,                                         \
 670           "Verify stack of each thread when it is entering a runtime call") \
 671                                                                             \
 672   diagnostic(bool, ForceUnreachable, false,                                 \
 673           "Make all non code cache addresses to be unreachable by "         \
 674           "forcing use of 64bit literal fixups")                            \
 675                                                                             \
 676   notproduct(bool, StressDerivedPointers, false,                            \
 677           "Force scavenge when a derived pointer is detected on stack "     \
 678           "after rtm call")                                                 \
 679                                                                             \
 680   develop(bool, TraceDerivedPointers, false,                                \
 681           "Trace traversal of derived pointers on stack")                   \
 682                                                                             \
 683   notproduct(bool, TraceCodeBlobStacks, false,                              \
 684           "Trace stack-walk of codeblobs")                                  \
 685                                                                             \
 686   product(bool, PrintJNIResolving, false,                                   \
 687           "Used to implement -v:jni")                                       \
 688                                                                             \
 689   notproduct(bool, PrintRewrites, false,                                    \
 690           "Print methods that are being rewritten")                         \
 691                                                                             \
 692   product(bool, UseInlineCaches, true,                                      \
 693           "Use Inline Caches for virtual calls ")                           \
 694                                                                             \
 695   develop(bool, InlineArrayCopy, true,                                      \
 696           "Inline arraycopy native that is known to be part of "            \
 697           "base library DLL")                                               \
 698                                                                             \
 699   develop(bool, InlineObjectHash, true,                                     \
 700           "Inline Object::hashCode() native that is known to be part "      \
 701           "of base library DLL")                                            \
 702                                                                             \
 703   develop(bool, InlineNatives, true,                                        \
 704           "Inline natives that are known to be part of base library DLL")   \
 705                                                                             \
 706   develop(bool, InlineMathNatives, true,                                    \
 707           "Inline SinD, CosD, etc.")                                        \
 708                                                                             \
 709   develop(bool, InlineClassNatives, true,                                   \
 710           "Inline Class.isInstance, etc")                                   \
 711                                                                             \
 712   develop(bool, InlineThreadNatives, true,                                  \
 713           "Inline Thread.currentThread, etc")                               \
 714                                                                             \
 715   develop(bool, InlineUnsafeOps, true,                                      \
 716           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 717                                                                             \
 718   product(bool, CriticalJNINatives, true,                                   \
 719           "Check for critical JNI entry points")                            \
 720                                                                             \
 721   notproduct(bool, StressCriticalJNINatives, false,                         \
 722           "Exercise register saving code in critical natives")              \
 723                                                                             \
 724   product(bool, UseSSE42Intrinsics, false,                                  \
 725           "SSE4.2 versions of intrinsics")                                  \
 726                                                                             \
 727   product(bool, UseAESIntrinsics, false,                                    \
 728           "Use intrinsics for AES versions of crypto")                      \
 729                                                                             \
 730   product(bool, UseSHA1Intrinsics, false,                                   \
 731           "Use intrinsics for SHA-1 crypto hash function")                  \
 732                                                                             \
 733   product(bool, UseSHA256Intrinsics, false,                                 \
 734           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions")   \
 735                                                                             \
 736   product(bool, UseSHA512Intrinsics, false,                                 \
 737           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions")   \
 738                                                                             \
 739   product(bool, UseCRC32Intrinsics, false,                                  \
 740           "use intrinsics for java.util.zip.CRC32")                         \
 741                                                                             \
 742   develop(bool, TraceCallFixup, false,                                      \
 743           "Trace all call fixups")                                          \
 744                                                                             \
 745   develop(bool, DeoptimizeALot, false,                                      \
 746           "Deoptimize at every exit from the runtime system")               \
 747                                                                             \
 748   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 749           "A comma separated list of bcis to deoptimize at")                \
 750                                                                             \
 751   product(bool, DeoptimizeRandom, false,                                    \
 752           "Deoptimize random frames on random exit from the runtime system")\
 753                                                                             \
 754   notproduct(bool, ZombieALot, false,                                       \
 755           "Create zombies (non-entrant) at exit from the runtime system")   \
 756                                                                             \
 757   product(bool, UnlinkSymbolsALot, false,                                   \
 758           "Unlink unreferenced symbols from the symbol table at safepoints")\
 759                                                                             \
 760   notproduct(bool, WalkStackALot, false,                                    \
 761           "Trace stack (no print) at every exit from the runtime system")   \
 762                                                                             \
 763   product(bool, Debugging, false,                                           \
 764           "Set when executing debug methods in debug.cpp "                  \
 765           "(to prevent triggering assertions)")                             \
 766                                                                             \
 767   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 768           "Enable strict checks that safepoints cannot happen for threads " \
 769           "that use No_Safepoint_Verifier")                                 \
 770                                                                             \
 771   notproduct(bool, VerifyLastFrame, false,                                  \
 772           "Verify oops on last frame on entry to VM")                       \
 773                                                                             \
 774   develop(bool, TraceHandleAllocation, false,                               \
 775           "Print out warnings when suspiciously many handles are allocated")\
 776                                                                             \
 777   product(bool, UseCompilerSafepoints, true,                                \
 778           "Stop at safepoints in compiled code")                            \
 779                                                                             \
 780   product(bool, FailOverToOldVerifier, true,                                \
 781           "Fail over to old verifier when split verifier fails")            \
 782                                                                             \
 783   develop(bool, ShowSafepointMsgs, false,                                   \
 784           "Show message about safepoint synchronization")                   \
 785                                                                             \
 786   product(bool, SafepointTimeout, false,                                    \
 787           "Time out and warn or fail after SafepointTimeoutDelay "          \
 788           "milliseconds if failed to reach safepoint")                      \
 789                                                                             \
 790   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 791           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 792                                                                             \
 793   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 794   /* typically, at most a few retries are needed */                         \
 795   product(intx, SuspendRetryCount, 50,                                      \
 796           "Maximum retry count for an external suspend request")            \
 797                                                                             \
 798   product(intx, SuspendRetryDelay, 5,                                       \
 799           "Milliseconds to delay per retry (* current_retry_count)")        \
 800                                                                             \
 801   product(bool, AssertOnSuspendWaitFailure, false,                          \
 802           "Assert/Guarantee on external suspend wait failure")              \
 803                                                                             \
 804   product(bool, TraceSuspendWaitFailures, false,                            \
 805           "Trace external suspend wait failures")                           \
 806                                                                             \
 807   product(bool, MaxFDLimit, true,                                           \
 808           "Bump the number of file descriptors to maximum in Solaris")      \
 809                                                                             \
 810   diagnostic(bool, LogEvents, true,                                         \
 811           "Enable the various ring buffer event logs")                      \
 812                                                                             \
 813   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 814           "Number of ring buffer event logs")                               \
 815                                                                             \
 816   product(bool, BytecodeVerificationRemote, true,                           \
 817           "Enable the Java bytecode verifier for remote classes")           \
 818                                                                             \
 819   product(bool, BytecodeVerificationLocal, false,                           \
 820           "Enable the Java bytecode verifier for local classes")            \
 821                                                                             \
 822   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 823           "Force exceptions on FP stack under/overflow")                    \
 824                                                                             \
 825   develop(bool, VerifyStackAtCalls, false,                                  \
 826           "Verify that the stack pointer is unchanged after calls")         \
 827                                                                             \
 828   develop(bool, TraceJavaAssertions, false,                                 \
 829           "Trace java language assertions")                                 \
 830                                                                             \
 831   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 832           "Temporary - see javaClasses.cpp")                                \
 833                                                                             \
 834   notproduct(bool, PrintMallocFree, false,                                  \
 835           "Trace calls to C heap malloc/free allocation")                   \
 836                                                                             \
 837   product(bool, PrintOopAddress, false,                                     \
 838           "Always print the location of the oop")                           \
 839                                                                             \
 840   notproduct(bool, VerifyCodeCacheOften, false,                             \
 841           "Verify compiled-code cache often")                               \
 842                                                                             \
 843   develop(bool, ZapDeadCompiledLocals, false,                               \
 844           "Zap dead locals in compiler frames")                             \
 845                                                                             \
 846   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 847           "Zap dead locals (old version, zaps all frames when "             \
 848           "entering the VM")                                                \
 849                                                                             \
 850   notproduct(bool, CheckOopishValues, false,                                \
 851           "Warn if value contains oop (requires ZapDeadLocals)")            \
 852                                                                             \
 853   develop(bool, UseMallocOnly, false,                                       \
 854           "Use only malloc/free for allocation (no resource area/arena)")   \
 855                                                                             \
 856   develop(bool, PrintMalloc, false,                                         \
 857           "Print all malloc/free calls")                                    \
 858                                                                             \
 859   develop(bool, PrintMallocStatistics, false,                               \
 860           "Print malloc/free statistics")                                   \
 861                                                                             \
 862   develop(bool, ZapResourceArea, trueInDebug,                               \
 863           "Zap freed resource/arena space with 0xABABABAB")                 \
 864                                                                             \
 865   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 866           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 867                                                                             \
 868   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 869           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 870                                                                             \
 871   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 872           "Zap allocated/freed stack segments with 0xFADFADED")             \
 873                                                                             \
 874   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 875           "Zap unused heap space with 0xBAADBABE")                          \
 876                                                                             \
 877   develop(bool, TraceZapUnusedHeapArea, false,                              \
 878           "Trace zapping of unused heap space")                             \
 879                                                                             \
 880   develop(bool, CheckZapUnusedHeapArea, false,                              \
 881           "Check zapping of unused heap space")                             \
 882                                                                             \
 883   develop(bool, ZapFillerObjects, trueInDebug,                              \
 884           "Zap filler objects with 0xDEAFBABE")                             \
 885                                                                             \
 886   develop(bool, PrintVMMessages, true,                                      \
 887           "Print VM messages on console")                                   \
 888                                                                             \
 889   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 890           "Print the time the application has been running")                \
 891                                                                             \
 892   product(bool, PrintGCApplicationStoppedTime, false,                       \
 893           "Print the time the application has been stopped")                \
 894                                                                             \
 895   diagnostic(bool, VerboseVerification, false,                              \
 896           "Display detailed verification details")                          \
 897                                                                             \
 898   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 899           "If > 0, provokes an error after VM initialization; the value "   \
 900           "determines which error to provoke. See test_error_handler() "    \
 901           "in debug.cpp.")                                                  \
 902                                                                             \
 903   develop(bool, Verbose, false,                                             \
 904           "Print additional debugging information from other modes")        \
 905                                                                             \
 906   develop(bool, PrintMiscellaneous, false,                                  \
 907           "Print uncategorized debugging information (requires +Verbose)")  \
 908                                                                             \
 909   develop(bool, WizardMode, false,                                          \
 910           "Print much more debugging information")                          \
 911                                                                             \
 912   product(bool, ShowMessageBoxOnError, false,                               \
 913           "Keep process alive on VM fatal error")                           \
 914                                                                             \
 915   product(bool, CreateMinidumpOnCrash, false,                               \
 916           "Create minidump on VM fatal error")                              \
 917                                                                             \
 918   product_pd(bool, UseOSErrorReporting,                                     \
 919           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 920                                                                             \
 921   product(bool, SuppressFatalErrorMessage, false,                           \
 922           "Report NO fatal error message (avoid deadlock)")                 \
 923                                                                             \
 924   product(ccstrlist, OnError, "",                                           \
 925           "Run user-defined commands on fatal error; see VMError.cpp "      \
 926           "for examples")                                                   \
 927                                                                             \
 928   product(ccstrlist, OnOutOfMemoryError, "",                                \
 929           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 930                                                                             \
 931   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 932           "Dump heap to file before any major stop-the-world GC")           \
 933                                                                             \
 934   manageable(bool, HeapDumpAfterFullGC, false,                              \
 935           "Dump heap to file after any major stop-the-world GC")            \
 936                                                                             \
 937   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 938           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 939                                                                             \
 940   manageable(ccstr, HeapDumpPath, NULL,                                     \
 941           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 942           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 943           "in the working directory)")                                      \
 944                                                                             \
 945   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 946           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 947           "when the heap usage is larger than this")                        \
 948                                                                             \
 949   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 950           "Approximate segment size when generating a segmented heap dump") \
 951                                                                             \
 952   develop(bool, BreakAtWarning, false,                                      \
 953           "Execute breakpoint upon encountering VM warning")                \
 954                                                                             \
 955   develop(bool, TraceVMOperation, false,                                    \
 956           "Trace VM operations")                                            \
 957                                                                             \
 958   develop(bool, UseFakeTimers, false,                                       \
 959           "Tell whether the VM should use system time or a fake timer")     \
 960                                                                             \
 961   product(ccstr, NativeMemoryTracking, "off",                               \
 962           "Native memory tracking options")                                 \
 963                                                                             \
 964   diagnostic(bool, PrintNMTStatistics, false,                               \
 965           "Print native memory tracking summary data if it is on")          \
 966                                                                             \
 967   diagnostic(bool, LogCompilation, false,                                   \
 968           "Log compilation activity in detail to LogFile")                  \
 969                                                                             \
 970   product(bool, PrintCompilation, false,                                    \
 971           "Print compilations")                                             \
 972                                                                             \
 973   diagnostic(bool, TraceNMethodInstalls, false,                             \
 974           "Trace nmethod installation")                                     \
 975                                                                             \
 976   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 977           "0: do not allow scavengable oops in the code cache; "            \
 978           "1: allow scavenging from the code cache; "                       \
 979           "2: emit as many constants as the compiler can see")              \
 980                                                                             \
 981   product(bool, AlwaysRestoreFPU, false,                                    \
 982           "Restore the FPU control word after every JNI call (expensive)")  \
 983                                                                             \
 984   diagnostic(bool, PrintCompilation2, false,                                \
 985           "Print additional statistics per compilation")                    \
 986                                                                             \
 987   diagnostic(bool, PrintAdapterHandlers, false,                             \
 988           "Print code generated for i2c/c2i adapters")                      \
 989                                                                             \
 990   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 991           "Verify that i2c/c2i adapters are called properly")               \
 992                                                                             \
 993   develop(bool, VerifyAdapterSharing, false,                                \
 994           "Verify that the code for shared adapters is the equivalent")     \
 995                                                                             \
 996   diagnostic(bool, PrintAssembly, false,                                    \
 997           "Print assembly code (using external disassembler.so)")           \
 998                                                                             \
 999   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
1000           "Print options string passed to disassembler.so")                 \
1001                                                                             \
1002   diagnostic(bool, PrintNMethods, false,                                    \
1003           "Print assembly code for nmethods when generated")                \
1004                                                                             \
1005   diagnostic(bool, PrintNativeNMethods, false,                              \
1006           "Print assembly code for native nmethods when generated")         \
1007                                                                             \
1008   develop(bool, PrintDebugInfo, false,                                      \
1009           "Print debug information for all nmethods when generated")        \
1010                                                                             \
1011   develop(bool, PrintRelocations, false,                                    \
1012           "Print relocation information for all nmethods when generated")   \
1013                                                                             \
1014   develop(bool, PrintDependencies, false,                                   \
1015           "Print dependency information for all nmethods when generated")   \
1016                                                                             \
1017   develop(bool, PrintExceptionHandlers, false,                              \
1018           "Print exception handler tables for all nmethods when generated") \
1019                                                                             \
1020   develop(bool, StressCompiledExceptionHandlers, false,                     \
1021           "Exercise compiled exception handlers")                           \
1022                                                                             \
1023   develop(bool, InterceptOSException, false,                                \
1024           "Start debugger when an implicit OS (e.g. NULL) "                 \
1025           "exception happens")                                              \
1026                                                                             \
1027   product(bool, PrintCodeCache, false,                                      \
1028           "Print the code cache memory usage when exiting")                 \
1029                                                                             \
1030   develop(bool, PrintCodeCache2, false,                                     \
1031           "Print detailed usage information on the code cache when exiting")\
1032                                                                             \
1033   product(bool, PrintCodeCacheOnCompilation, false,                         \
1034           "Print the code cache memory usage each time a method is "        \
1035           "compiled")                                                       \
1036                                                                             \
1037   diagnostic(bool, PrintStubCode, false,                                    \
1038           "Print generated stub code")                                      \
1039                                                                             \
1040   product(bool, StackTraceInThrowable, true,                                \
1041           "Collect backtrace in throwable when exception happens")          \
1042                                                                             \
1043   product(bool, OmitStackTraceInFastThrow, true,                            \
1044           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1045                                                                             \
1046   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1047           "Print bytecode statistics when dumping profiler output")         \
1048                                                                             \
1049   product(bool, ProfilerRecordPC, false,                                    \
1050           "Collect ticks for each 16 byte interval of compiled code")       \
1051                                                                             \
1052   product(bool, ProfileVM, false,                                           \
1053           "Profile ticks that fall within VM (either in the VM Thread "     \
1054           "or VM code called through stubs)")                               \
1055                                                                             \
1056   product(bool, ProfileIntervals, false,                                    \
1057           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1058                                                                             \
1059   notproduct(bool, ProfilerCheckIntervals, false,                           \
1060           "Collect and print information on spacing of profiler ticks")     \
1061                                                                             \
1062   develop(bool, PrintJVMWarnings, false,                                    \
1063           "Print warnings for unimplemented JVM functions")                 \
1064                                                                             \
1065   product(bool, PrintWarnings, true,                                        \
1066           "Print JVM warnings to output stream")                            \
1067                                                                             \
1068   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1069           "Print warnings for stalled SpinLocks")                           \
1070                                                                             \
1071   product(bool, RegisterFinalizersAtInit, true,                             \
1072           "Register finalizable objects at end of Object.<init> or "        \
1073           "after allocation")                                               \
1074                                                                             \
1075   develop(bool, RegisterReferences, true,                                   \
1076           "Tell whether the VM should register soft/weak/final/phantom "    \
1077           "references")                                                     \
1078                                                                             \
1079   develop(bool, IgnoreRewrites, false,                                      \
1080           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1081           "This is unsafe!")                                                \
1082                                                                             \
1083   develop(bool, PrintCodeCacheExtension, false,                             \
1084           "Print extension of code cache")                                  \
1085                                                                             \
1086   develop(bool, UsePrivilegedStack, true,                                   \
1087           "Enable the security JVM functions")                              \
1088                                                                             \
1089   develop(bool, ProtectionDomainVerification, true,                         \
1090           "Verify protection domain before resolution in system dictionary")\
1091                                                                             \
1092   product(bool, ClassUnloading, true,                                       \
1093           "Do unloading of classes")                                        \
1094                                                                             \
1095   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1096           "Do unloading of classes with a concurrent marking cycle")        \
1097                                                                             \
1098   develop(bool, DisableStartThread, false,                                  \
1099           "Disable starting of additional Java threads "                    \
1100           "(for debugging only)")                                           \
1101                                                                             \
1102   develop(bool, MemProfiling, false,                                        \
1103           "Write memory usage profiling to log file")                       \
1104                                                                             \
1105   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1106           "Print the system dictionary at exit")                            \
1107                                                                             \
1108   experimental(intx, PredictedLoadedClassCount, 0,                          \
1109           "Experimental: Tune loaded class cache starting size")            \
1110                                                                             \
1111   diagnostic(bool, UnsyncloadClass, false,                                  \
1112           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1113           "class loader must call VM synchronized for findClass "           \
1114           "and defineClass.")                                               \
1115                                                                             \
1116   product(bool, AlwaysLockClassLoader, false,                               \
1117           "Require the VM to acquire the class loader lock before calling " \
1118           "loadClass() even for class loaders registering "                 \
1119           "as parallel capable")                                            \
1120                                                                             \
1121   product(bool, AllowParallelDefineClass, false,                            \
1122           "Allow parallel defineClass requests for class loaders "          \
1123           "registering as parallel capable")                                \
1124                                                                             \
1125   product(bool, MustCallLoadClassInternal, false,                           \
1126           "Call loadClassInternal() rather than loadClass()")               \
1127                                                                             \
1128   product_pd(bool, DontYieldALot,                                           \
1129           "Throw away obvious excess yield calls (for Solaris only)")       \
1130                                                                             \
1131   product_pd(bool, ConvertSleepToYield,                                     \
1132           "Convert sleep(0) to thread yield "                               \
1133           "(may be off for Solaris to improve GUI)")                        \
1134                                                                             \
1135   product(bool, ConvertYieldToSleep, false,                                 \
1136           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1137           "behavior (Solaris only)")                                        \
1138                                                                             \
1139   product(bool, UseBoundThreads, true,                                      \
1140           "Bind user level threads to kernel threads (for Solaris only)")   \
1141                                                                             \
1142   develop(bool, UseDetachedThreads, true,                                   \
1143           "Use detached threads that are recycled upon termination "        \
1144           "(for Solaris only)")                                             \
1145                                                                             \
1146   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
1147                "Disable the use of stack guard pages if the JVM is loaded " \
1148                "on the primordial process thread")                          \
1149                                                                             \
1150   product(bool, UseLWPSynchronization, true,                                \
1151           "Use LWP-based instead of libthread-based synchronization "       \
1152           "(SPARC only)")                                                   \
1153                                                                             \
1154   product(ccstr, SyncKnobs, NULL,                                           \
1155           "(Unstable) Various monitor synchronization tunables")            \
1156                                                                             \
1157   product(intx, EmitSync, 0,                                                \
1158           "(Unsafe, Unstable) "                                             \
1159           "Control emission of inline sync fast-path code")                 \
1160                                                                             \
1161   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1162                                                                             \
1163   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1164                                                                             \
1165   product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1166                                                                             \
1167   product(intx, SyncVerbose, 0, "(Unstable)")                               \
1168                                                                             \
1169   product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")                    \
1170                                                                             \
1171   product(intx, hashCode, 5,                                                \
1172           "(Unstable) select hashCode generation algorithm")                \
1173                                                                             \
1174   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1175           "(Unstable, Linux-specific) "                                     \
1176           "avoid NPTL-FUTEX hang pthread_cond_timedwait")                   \
1177                                                                             \
1178   product(bool, FilterSpuriousWakeups, true,                                \
1179           "Prevent spurious or premature wakeups from object.wait "         \
1180           "(Solaris only)")                                                 \
1181                                                                             \
1182   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1183                                                                             \
1184   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1185                                                                             \
1186   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1187                                                                             \
1188   develop(bool, UsePthreads, false,                                         \
1189           "Use pthread-based instead of libthread-based synchronization "   \
1190           "(SPARC only)")                                                   \
1191                                                                             \
1192   product(bool, AdjustConcurrency, false,                                   \
1193           "Call thr_setconcurrency at thread creation time to avoid "       \
1194           "LWP starvation on MP systems (for Solaris Only)")                \
1195                                                                             \
1196   product(bool, ReduceSignalUsage, false,                                   \
1197           "Reduce the use of OS signals in Java and/or the VM")             \
1198                                                                             \
1199   develop(bool, LoadLineNumberTables, true,                                 \
1200           "Tell whether the class file parser loads line number tables")    \
1201                                                                             \
1202   develop(bool, LoadLocalVariableTables, true,                              \
1203           "Tell whether the class file parser loads local variable tables") \
1204                                                                             \
1205   develop(bool, LoadLocalVariableTypeTables, true,                          \
1206           "Tell whether the class file parser loads local variable type"    \
1207           "tables")                                                         \
1208                                                                             \
1209   product(bool, AllowUserSignalHandlers, false,                             \
1210           "Do not complain if the application installs signal handlers "    \
1211           "(Solaris & Linux only)")                                         \
1212                                                                             \
1213   product(bool, UseSignalChaining, true,                                    \
1214           "Use signal-chaining to invoke signal handlers installed "        \
1215           "by the application (Solaris & Linux only)")                      \
1216                                                                             \
1217   product(bool, UseAltSigs, false,                                          \
1218           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1219           "internal signals (Solaris only)")                                \
1220                                                                             \
1221   product(bool, AllowJNIEnvProxy, false,                                    \
1222           "Allow JNIEnv proxies for jdbx")                                  \
1223                                                                             \
1224   product(bool, JNIDetachReleasesMonitors, true,                            \
1225           "JNI DetachCurrentThread releases monitors owned by thread")      \
1226                                                                             \
1227   product(bool, RestoreMXCSROnJNICalls, false,                              \
1228           "Restore MXCSR when returning from JNI calls")                    \
1229                                                                             \
1230   product(bool, CheckJNICalls, false,                                       \
1231           "Verify all arguments to JNI calls")                              \
1232                                                                             \
1233   product(bool, CheckEndorsedAndExtDirs, false,                             \
1234           "Verify the endorsed and extension directories are not used")     \
1235                                                                             \
1236   product(bool, UseFastJNIAccessors, true,                                  \
1237           "Use optimized versions of Get<Primitive>Field")                  \
1238                                                                             \
1239   product(intx, MaxJNILocalCapacity, 65536,                                 \
1240           "Maximum allowable local JNI handle capacity to "                 \
1241           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1242           "where <= 0 is unlimited, default: 65536")                        \
1243                                                                             \
1244   product(bool, EagerXrunInit, false,                                       \
1245           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1246           "but not all -Xrun libraries may support the state of the VM "    \
1247           "at this time")                                                   \
1248                                                                             \
1249   product(bool, PreserveAllAnnotations, false,                              \
1250           "Preserve RuntimeInvisibleAnnotations as well "                   \
1251           "as RuntimeVisibleAnnotations")                                   \
1252                                                                             \
1253   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1254           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1255                                                                             \
1256   product(bool, LazyBootClassLoader, true,                                  \
1257           "Enable/disable lazy opening of boot class path entries")         \
1258                                                                             \
1259   product(bool, UseXMMForArrayCopy, false,                                  \
1260           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1261                                                                             \
1262   product(intx, FieldsAllocationStyle, 1,                                   \
1263           "0 - type based with oops first, 1 - with oops last, "            \
1264           "2 - oops in super and sub classes are together")                 \
1265                                                                             \
1266   product(bool, CompactFields, true,                                        \
1267           "Allocate nonstatic fields in gaps between previous fields")      \
1268                                                                             \
1269   notproduct(bool, PrintFieldLayout, false,                                 \
1270           "Print field layout for each class")                              \
1271                                                                             \
1272   product(intx, ContendedPaddingWidth, 128,                                 \
1273           "How many bytes to pad the fields/classes marked @Contended with")\
1274                                                                             \
1275   product(bool, EnableContended, true,                                      \
1276           "Enable @Contended annotation support")                           \
1277                                                                             \
1278   product(bool, RestrictContended, true,                                    \
1279           "Restrict @Contended to trusted classes")                         \
1280                                                                             \
1281   product(bool, UseBiasedLocking, true,                                     \
1282           "Enable biased locking in JVM")                                   \
1283                                                                             \
1284   product(intx, BiasedLockingStartupDelay, 4000,                            \
1285           "Number of milliseconds to wait before enabling biased locking")  \
1286                                                                             \
1287   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1288           "Print statistics of biased locking in JVM")                      \
1289                                                                             \
1290   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1291           "Threshold of number of revocations per type to try to "          \
1292           "rebias all objects in the heap of that type")                    \
1293                                                                             \
1294   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1295           "Threshold of number of revocations per type to permanently "     \
1296           "revoke biases of all objects in the heap of that type")          \
1297                                                                             \
1298   product(intx, BiasedLockingDecayTime, 25000,                              \
1299           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1300           "type after previous bulk rebias")                                \
1301                                                                             \
1302   product(bool, ExitOnOutOfMemoryError, false,                              \
1303           "JVM exits on the first occurrence of an out-of-memory error")    \
1304                                                                             \
1305   product(bool, CrashOnOutOfMemoryError, false,                             \
1306           "JVM aborts, producing an error log and core/mini dump, on the "  \
1307           "first occurrence of an out-of-memory error")                     \
1308                                                                             \
1309   /* tracing */                                                             \
1310                                                                             \
1311   notproduct(bool, TraceRuntimeCalls, false,                                \
1312           "Trace run-time calls")                                           \
1313                                                                             \
1314   develop(bool, TraceJNICalls, false,                                       \
1315           "Trace JNI calls")                                                \
1316                                                                             \
1317   develop(bool, StressRewriter, false,                                      \
1318           "Stress linktime bytecode rewriting")                             \
1319                                                                             \
1320   notproduct(bool, TraceJVMCalls, false,                                    \
1321           "Trace JVM calls")                                                \
1322                                                                             \
1323   product(ccstr, TraceJVMTI, NULL,                                          \
1324           "Trace flags for JVMTI functions and events")                     \
1325                                                                             \
1326   /* This option can change an EMCP method into an obsolete method. */      \
1327   /* This can affect tests that except specific methods to be EMCP. */      \
1328   /* This option should be used with caution. */                            \
1329   product(bool, StressLdcRewrite, false,                                    \
1330           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1331                                                                             \
1332   product(intx, TraceRedefineClasses, 0,                                    \
1333           "Trace level for JVMTI RedefineClasses")                          \
1334                                                                             \
1335   develop(bool, StressMethodComparator, false,                              \
1336           "Run the MethodComparator on all loaded methods")                 \
1337                                                                             \
1338   /* change to false by default sometime after Mustang */                   \
1339   product(bool, VerifyMergedCPBytecodes, true,                              \
1340           "Verify bytecodes after RedefineClasses constant pool merging")   \
1341                                                                             \
1342   develop(bool, TraceJNIHandleAllocation, false,                            \
1343           "Trace allocation/deallocation of JNI handle blocks")             \
1344                                                                             \
1345   develop(bool, TraceThreadEvents, false,                                   \
1346           "Trace all thread events")                                        \
1347                                                                             \
1348   develop(bool, TraceBytecodes, false,                                      \
1349           "Trace bytecode execution")                                       \
1350                                                                             \
1351   develop(bool, TraceClassInitialization, false,                            \
1352           "Trace class initialization")                                     \
1353                                                                             \
1354   develop(bool, TraceExceptions, false,                                     \
1355           "Trace exceptions")                                               \
1356                                                                             \
1357   develop(bool, TraceICs, false,                                            \
1358           "Trace inline cache changes")                                     \
1359                                                                             \
1360   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1361           "Trace method invocation counter overflow")                       \
1362                                                                             \
1363   develop(bool, TraceInlineCacheClearing, false,                            \
1364           "Trace clearing of inline caches in nmethods")                    \
1365                                                                             \
1366   develop(bool, TraceDependencies, false,                                   \
1367           "Trace dependencies")                                             \
1368                                                                             \
1369   develop(bool, VerifyDependencies, trueInDebug,                            \
1370           "Exercise and verify the compilation dependency mechanism")       \
1371                                                                             \
1372   develop(bool, TraceNewOopMapGeneration, false,                            \
1373           "Trace OopMapGeneration")                                         \
1374                                                                             \
1375   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1376           "Trace OopMapGeneration: print detailed cell states")             \
1377                                                                             \
1378   develop(bool, TimeOopMap, false,                                          \
1379           "Time calls to GenerateOopMap::compute_map() in sum")             \
1380                                                                             \
1381   develop(bool, TimeOopMap2, false,                                         \
1382           "Time calls to GenerateOopMap::compute_map() individually")       \
1383                                                                             \
1384   develop(bool, TraceMonitorMismatch, false,                                \
1385           "Trace monitor matching failures during OopMapGeneration")        \
1386                                                                             \
1387   develop(bool, TraceOopMapRewrites, false,                                 \
1388           "Trace rewriting of method oops during oop map generation")       \
1389                                                                             \
1390   develop(bool, TraceSafepoint, false,                                      \
1391           "Trace safepoint operations")                                     \
1392                                                                             \
1393   develop(bool, TraceICBuffer, false,                                       \
1394           "Trace usage of IC buffer")                                       \
1395                                                                             \
1396   develop(bool, TraceCompiledIC, false,                                     \
1397           "Trace changes of compiled IC")                                   \
1398                                                                             \
1399   notproduct(bool, TraceZapDeadLocals, false,                               \
1400           "Trace zapping dead locals")                                      \
1401                                                                             \
1402   develop(bool, TraceStartupTime, false,                                    \
1403           "Trace setup time")                                               \
1404                                                                             \
1405   develop(bool, TraceProtectionDomainVerification, false,                   \
1406           "Trace protection domain verification")                           \
1407                                                                             \
1408   develop(bool, TraceClearedExceptions, false,                              \
1409           "Print when an exception is forcibly cleared")                    \
1410                                                                             \
1411   product(bool, TraceClassResolution, false,                                \
1412           "Trace all constant pool resolutions (for debugging)")            \
1413                                                                             \
1414   product(bool, TraceBiasedLocking, false,                                  \
1415           "Trace biased locking in JVM")                                    \
1416                                                                             \
1417   product(bool, TraceMonitorInflation, false,                               \
1418           "Trace monitor inflation in JVM")                                 \
1419                                                                             \
1420   /* gc */                                                                  \
1421                                                                             \
1422   product(bool, UseSerialGC, false,                                         \
1423           "Use the Serial garbage collector")                               \
1424                                                                             \
1425   product(bool, UseG1GC, false,                                             \
1426           "Use the Garbage-First garbage collector")                        \
1427                                                                             \
1428   product(bool, UseParallelGC, false,                                       \
1429           "Use the Parallel Scavenge garbage collector")                    \
1430                                                                             \
1431   product(bool, UseParallelOldGC, false,                                    \
1432           "Use the Parallel Old garbage collector")                         \
1433                                                                             \
1434   product(bool, UseShenandoahGC, false,                                     \
1435           "Use the Shenandoah garbage collector")                           \
1436                                                                             \
1437   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1438           "How often should we maximally compact the heap (not allowing "   \
1439           "any dead space)")                                                \
1440                                                                             \
1441   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1442           "The collection count for the first maximum compaction")          \
1443                                                                             \
1444   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1445           "Use maximum compaction in the Parallel Old garbage collector "   \
1446           "for a system GC")                                                \
1447                                                                             \
1448   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1449           "The mean used by the parallel compact dead wood "                \
1450           "limiter (a number between 0-100)")                               \
1451                                                                             \
1452   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1453           "The standard deviation used by the parallel compact dead wood "  \
1454           "limiter (a number between 0-100)")                               \
1455                                                                             \
1456   product(uintx, ParallelGCThreads, 0,                                      \
1457           "Number of parallel threads parallel gc will use")                \
1458                                                                             \
1459   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1460           "Dynamically choose the number of parallel threads "              \
1461           "parallel gc will use")                                           \
1462                                                                             \
1463   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1464           "Force dynamic selection of the number of "                       \
1465           "parallel threads parallel gc will use to aid debugging")         \
1466                                                                             \
1467   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1468           "Size of heap (bytes) per GC thread used in calculating the "     \
1469           "number of GC threads")                                           \
1470                                                                             \
1471   product(bool, TraceDynamicGCThreads, false,                               \
1472           "Trace the dynamic GC thread usage")                              \
1473                                                                             \
1474   develop(bool, ParallelOldGCSplitALot, false,                              \
1475           "Provoke splitting (copying data from a young gen space to "      \
1476           "multiple destination spaces)")                                   \
1477                                                                             \
1478   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1479           "How often to provoke splitting a young gen space")               \
1480                                                                             \
1481   product(uintx, ConcGCThreads, 0,                                          \
1482           "Number of threads concurrent gc will use")                       \
1483                                                                             \
1484   product(uintx, YoungPLABSize, 4096,                                       \
1485           "Size of young gen promotion LAB's (in HeapWords)")               \
1486                                                                             \
1487   product(uintx, OldPLABSize, 1024,                                         \
1488           "Size of old gen promotion LAB's (in HeapWords)")                 \
1489                                                                             \
1490   product(uintx, GCTaskTimeStampEntries, 200,                               \
1491           "Number of time stamp entries per gc worker thread")              \
1492                                                                             \
1493   product(bool, AlwaysTenure, false,                                        \
1494           "Always tenure objects in eden (ParallelGC only)")                \
1495                                                                             \
1496   product(bool, NeverTenure, false,                                         \
1497           "Never tenure objects in eden, may tenure on overflow "           \
1498           "(ParallelGC only)")                                              \
1499                                                                             \
1500   product(bool, ScavengeBeforeFullGC, true,                                 \
1501           "Scavenge youngest generation before each full GC, "              \
1502           "used with UseParallelGC")                                        \
1503                                                                             \
1504   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1505           "Allow scavenges to occur when to-space contains objects")        \
1506                                                                             \
1507   product(bool, UseConcMarkSweepGC, false,                                  \
1508           "Use Concurrent Mark-Sweep GC in the old generation")             \
1509                                                                             \
1510   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1511           "A System.gc() request invokes a concurrent collection; "         \
1512           "(effective only when UseConcMarkSweepGC)")                       \
1513                                                                             \
1514   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1515           "A System.gc() request invokes a concurrent collection and "      \
1516           "also unloads classes during such a concurrent gc cycle "         \
1517           "(effective only when UseConcMarkSweepGC)")                       \
1518                                                                             \
1519   product(bool, GCLockerInvokesConcurrent, false,                           \
1520           "The exit of a JNI critical section necessitating a scavenge, "   \
1521           "also kicks off a background concurrent collection")              \
1522                                                                             \
1523   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1524           "How much the GC can expand the eden by while the GC locker "     \
1525           "is active (as a percentage)")                                    \
1526                                                                             \
1527   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1528           "Number of times to retry allocations when "                      \
1529           "blocked by the GC locker")                                       \
1530                                                                             \
1531   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1532           "Use adaptive free lists in the CMS generation")                  \
1533                                                                             \
1534   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1535           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1536                                                                             \
1537   develop(bool, RotateCMSCollectionTypes, false,                            \
1538           "Rotate the CMS collections among concurrent and STW")            \
1539                                                                             \
1540   product(bool, UseCMSBestFit, true,                                        \
1541           "Use CMS best fit allocation strategy")                           \
1542                                                                             \
1543   product(bool, UseCMSCollectionPassing, true,                              \
1544           "Use passing of collection from background to foreground")        \
1545                                                                             \
1546   product(bool, UseParNewGC, false,                                         \
1547           "Use parallel threads in the new generation")                     \
1548                                                                             \
1549   product(bool, ParallelGCVerbose, false,                                   \
1550           "Verbose output for parallel gc")                                 \
1551                                                                             \
1552   product(uintx, ParallelGCBufferWastePct, 10,                              \
1553           "Wasted fraction of parallel allocation buffer")                  \
1554                                                                             \
1555   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1556           "Retain parallel allocation buffers across scavenges; "           \
1557           "it is disabled because this currently conflicts with "           \
1558           "parallel card scanning under certain conditions.")               \
1559                                                                             \
1560   product(uintx, TargetPLABWastePct, 10,                                    \
1561           "Target wasted space in last buffer as percent of overall "       \
1562           "allocation")                                                     \
1563                                                                             \
1564   product(uintx, PLABWeight, 75,                                            \
1565           "Percentage (0-100) used to weigh the current sample when "       \
1566           "computing exponentially decaying average for ResizePLAB")        \
1567                                                                             \
1568   product(bool, ResizePLAB, true,                                           \
1569           "Dynamically resize (survivor space) promotion LAB's")            \
1570                                                                             \
1571   product(bool, PrintPLAB, false,                                           \
1572           "Print (survivor space) promotion LAB's sizing decisions")        \
1573                                                                             \
1574   product(intx, ParGCArrayScanChunk, 50,                                    \
1575           "Scan a subset of object array and push remainder, if array is "  \
1576           "bigger than this")                                               \
1577                                                                             \
1578   product(bool, ParGCUseLocalOverflow, false,                               \
1579           "Instead of a global overflow list, use local overflow stacks")   \
1580                                                                             \
1581   product(bool, ParGCTrimOverflow, true,                                    \
1582           "Eagerly trim the local overflow lists "                          \
1583           "(when ParGCUseLocalOverflow)")                                   \
1584                                                                             \
1585   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1586           "Simulate work queue overflow in ParNew")                         \
1587                                                                             \
1588   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1589           "An `interval' counter that determines how frequently "           \
1590           "we simulate overflow; a smaller number increases frequency")     \
1591                                                                             \
1592   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1593           "The desired number of objects to claim from the overflow list")  \
1594                                                                             \
1595   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1596           "The number of strides per worker thread that we divide up the "  \
1597           "card table scanning work into")                                  \
1598                                                                             \
1599   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1600           "The number of cards in each chunk of the parallel chunks used "  \
1601           "during card table scanning")                                     \
1602                                                                             \
1603   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1604           "Number of blocks to attempt to claim when refilling CMS LAB's "  \
1605           "for parallel GC")                                                \
1606                                                                             \
1607   product(uintx, OldPLABWeight, 50,                                         \
1608           "Percentage (0-100) used to weight the current sample when "      \
1609           "computing exponentially decaying average for resizing "          \
1610           "CMSParPromoteBlocksToClaim")                                     \
1611                                                                             \
1612   product(bool, ResizeOldPLAB, true,                                        \
1613           "Dynamically resize (old gen) promotion LAB's")                   \
1614                                                                             \
1615   product(bool, PrintOldPLAB, false,                                        \
1616           "Print (old gen) promotion LAB's sizing decisions")               \
1617                                                                             \
1618   product(uintx, CMSOldPLABMin, 16,                                         \
1619           "Minimum size of CMS gen promotion LAB caches per worker "        \
1620           "per block size")                                                 \
1621                                                                             \
1622   product(uintx, CMSOldPLABMax, 1024,                                       \
1623           "Maximum size of CMS gen promotion LAB caches per worker "        \
1624           "per block size")                                                 \
1625                                                                             \
1626   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1627           "Nominal number of refills of CMS gen promotion LAB cache "       \
1628           "per worker per block size")                                      \
1629                                                                             \
1630   product(bool, CMSOldPLABResizeQuicker, false,                             \
1631           "React on-the-fly during a scavenge to a sudden "                 \
1632           "change in block demand rate")                                    \
1633                                                                             \
1634   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1635           "The tolerance of the phase-change detector for on-the-fly "      \
1636           "PLAB resizing during a scavenge")                                \
1637                                                                             \
1638   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1639           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1640           "during a scavenge")                                              \
1641                                                                             \
1642   product(bool, AlwaysPreTouch, false,                                      \
1643           "Force all freshly committed pages to be pre-touched")            \
1644                                                                             \
1645   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1646           "The maximum size of young gen chosen by default per GC worker "  \
1647           "thread available")                                               \
1648                                                                             \
1649   product(bool, CMSIncrementalMode, false,                                  \
1650           "Whether CMS GC should operate in \"incremental\" mode")          \
1651                                                                             \
1652   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1653           "Percentage (0-100) of CMS incremental mode duty cycle. If "      \
1654           "CMSIncrementalPacing is enabled, then this is just the initial " \
1655           "value.")                                                         \
1656                                                                             \
1657   product(bool, CMSIncrementalPacing, true,                                 \
1658           "Whether the CMS incremental mode duty cycle should be "          \
1659           "automatically adjusted")                                         \
1660                                                                             \
1661   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1662           "Minimum percentage (0-100) of the CMS incremental duty cycle "   \
1663           "used when CMSIncrementalPacing is enabled")                      \
1664                                                                             \
1665   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1666           "Percentage (0-100) used to add conservatism when computing the " \
1667           "duty cycle")                                                     \
1668                                                                             \
1669   product(uintx, CMSIncrementalOffset, 0,                                   \
1670           "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1671           "is shifted to the right within the period between young GCs")    \
1672                                                                             \
1673   product(uintx, CMSExpAvgFactor, 50,                                       \
1674           "Percentage (0-100) used to weigh the current sample when "       \
1675           "computing exponential averages for CMS statistics")              \
1676                                                                             \
1677   product(uintx, CMS_FLSWeight, 75,                                         \
1678           "Percentage (0-100) used to weigh the current sample when "       \
1679           "computing exponentially decaying averages for CMS FLS "          \
1680           "statistics")                                                     \
1681                                                                             \
1682   product(uintx, CMS_FLSPadding, 1,                                         \
1683           "The multiple of deviation from mean to use for buffering "       \
1684           "against volatility in free list demand")                         \
1685                                                                             \
1686   product(uintx, FLSCoalescePolicy, 2,                                      \
1687           "CMS: aggressiveness level for coalescing, increasing "           \
1688           "from 0 to 4")                                                    \
1689                                                                             \
1690   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1691           "CMS: larger free blocks are always available for coalescing")    \
1692                                                                             \
1693   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1694           "CMS: the smaller the percentage the greater the coalescing "     \
1695           "force")                                                          \
1696                                                                             \
1697   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1698           "CMS: the factor by which to inflate estimated demand of small "  \
1699           "block sizes to prevent coalescing with an adjoining block")      \
1700                                                                             \
1701   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1702           "CMS: the factor by which to inflate estimated demand of large "  \
1703           "block sizes to prevent coalescing with an adjoining block")      \
1704                                                                             \
1705   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1706           "CMS: the factor by which to inflate estimated demand of small "  \
1707           "block sizes to prevent splitting to supply demand for smaller "  \
1708           "blocks")                                                         \
1709                                                                             \
1710   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1711           "CMS: the factor by which to inflate estimated demand of large "  \
1712           "block sizes to prevent splitting to supply demand for smaller "  \
1713           "blocks")                                                         \
1714                                                                             \
1715   product(bool, CMSExtrapolateSweep, false,                                 \
1716           "CMS: cushion for block demand during sweep")                     \
1717                                                                             \
1718   product(uintx, CMS_SweepWeight, 75,                                       \
1719           "Percentage (0-100) used to weight the current sample when "      \
1720           "computing exponentially decaying average for inter-sweep "       \
1721           "duration")                                                       \
1722                                                                             \
1723   product(uintx, CMS_SweepPadding, 1,                                       \
1724           "The multiple of deviation from mean to use for buffering "       \
1725           "against volatility in inter-sweep duration")                     \
1726                                                                             \
1727   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1728           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1729           "duration exceeds this threshold in milliseconds")                \
1730                                                                             \
1731   develop(bool, CMSTraceIncrementalMode, false,                             \
1732           "Trace CMS incremental mode")                                     \
1733                                                                             \
1734   develop(bool, CMSTraceIncrementalPacing, false,                           \
1735           "Trace CMS incremental mode pacing computation")                  \
1736                                                                             \
1737   develop(bool, CMSTraceThreadState, false,                                 \
1738           "Trace the CMS thread state (enable the trace_state() method)")   \
1739                                                                             \
1740   product(bool, CMSClassUnloadingEnabled, true,                             \
1741           "Whether class unloading enabled when using CMS GC")              \
1742                                                                             \
1743   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1744           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1745           "count for which classes may not be unloaded")                    \
1746                                                                             \
1747   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1748           "Compact when asked to collect CMS gen with "                     \
1749           "clear_all_soft_refs()")                                          \
1750                                                                             \
1751   product(bool, UseCMSCompactAtFullCollection, true,                        \
1752           "Use Mark-Sweep-Compact algorithm at full collections")           \
1753                                                                             \
1754   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1755           "Number of CMS full collection done before compaction if > 0")    \
1756                                                                             \
1757   develop(intx, CMSDictionaryChoice, 0,                                     \
1758           "Use BinaryTreeDictionary as default in the CMS generation")      \
1759                                                                             \
1760   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1761           "Replenish an indexed free list with this number of chunks")      \
1762                                                                             \
1763   product(bool, CMSReplenishIntermediate, true,                             \
1764           "Replenish all intermediate free-list caches")                    \
1765                                                                             \
1766   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1767           "When satisfying batched demand, split blocks from the "          \
1768           "IndexedFreeList whose size is a multiple of requested size")     \
1769                                                                             \
1770   product(bool, CMSLoopWarn, false,                                         \
1771           "Warn in case of excessive CMS looping")                          \
1772                                                                             \
1773   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1774           "Restore preserved marks early")                                  \
1775                                                                             \
1776   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1777           "Size of marking stack")                                          \
1778                                                                             \
1779   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1780           "Maximum size of marking stack")                                  \
1781                                                                             \
1782   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1783           "Simulate frequent marking stack / work queue overflow")          \
1784                                                                             \
1785   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1786           "An \"interval\" counter that determines how frequently "         \
1787           "to simulate overflow; a smaller number increases frequency")     \
1788                                                                             \
1789   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1790           "(Temporary, subject to experimentation) "                        \
1791           "Maximum number of abortable preclean iterations, if > 0")        \
1792                                                                             \
1793   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1794           "(Temporary, subject to experimentation) "                        \
1795           "Maximum time in abortable preclean (in milliseconds)")           \
1796                                                                             \
1797   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1798           "(Temporary, subject to experimentation) "                        \
1799           "Nominal minimum work per abortable preclean iteration")          \
1800                                                                             \
1801   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1802           "(Temporary, subject to experimentation) "                        \
1803           "Time that we sleep between iterations when not given "           \
1804           "enough work per iteration")                                      \
1805                                                                             \
1806   product(uintx, CMSRescanMultiple, 32,                                     \
1807           "Size (in cards) of CMS parallel rescan task")                    \
1808                                                                             \
1809   product(uintx, CMSConcMarkMultiple, 32,                                   \
1810           "Size (in cards) of CMS concurrent MT marking task")              \
1811                                                                             \
1812   product(bool, CMSAbortSemantics, false,                                   \
1813           "Whether abort-on-overflow semantics is implemented")             \
1814                                                                             \
1815   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1816           "Use the parallel initial mark.")                                 \
1817                                                                             \
1818   product(bool, CMSParallelRemarkEnabled, true,                             \
1819           "Whether parallel remark enabled (only if ParNewGC)")             \
1820                                                                             \
1821   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1822           "Whether parallel remark of survivor space "                      \
1823           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1824                                                                             \
1825   product(bool, CMSPLABRecordAlways, true,                                  \
1826           "Always record survivor space PLAB boundaries (effective only "   \
1827           "if CMSParallelSurvivorRemarkEnabled)")                           \
1828                                                                             \
1829   product(bool, CMSEdenChunksRecordAlways, true,                            \
1830           "Always record eden chunks used for the parallel initial mark "   \
1831           "or remark of eden")                                              \
1832                                                                             \
1833   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1834           "Print the eden and the survivor chunks used for the parallel "   \
1835           "initial mark or remark of the eden/survivor spaces")             \
1836                                                                             \
1837   product(bool, CMSConcurrentMTEnabled, true,                               \
1838           "Whether multi-threaded concurrent work enabled "                 \
1839           "(effective only if ParNewGC)")                                   \
1840                                                                             \
1841   product(bool, CMSPrecleaningEnabled, true,                                \
1842           "Whether concurrent precleaning enabled")                         \
1843                                                                             \
1844   product(uintx, CMSPrecleanIter, 3,                                        \
1845           "Maximum number of precleaning iteration passes")                 \
1846                                                                             \
1847   product(uintx, CMSPrecleanNumerator, 2,                                   \
1848           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1849           "ratio")                                                          \
1850                                                                             \
1851   product(uintx, CMSPrecleanDenominator, 3,                                 \
1852           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1853           "ratio")                                                          \
1854                                                                             \
1855   product(bool, CMSPrecleanRefLists1, true,                                 \
1856           "Preclean ref lists during (initial) preclean phase")             \
1857                                                                             \
1858   product(bool, CMSPrecleanRefLists2, false,                                \
1859           "Preclean ref lists during abortable preclean phase")             \
1860                                                                             \
1861   product(bool, CMSPrecleanSurvivors1, false,                               \
1862           "Preclean survivors during (initial) preclean phase")             \
1863                                                                             \
1864   product(bool, CMSPrecleanSurvivors2, true,                                \
1865           "Preclean survivors during abortable preclean phase")             \
1866                                                                             \
1867   product(uintx, CMSPrecleanThreshold, 1000,                                \
1868           "Do not iterate again if number of dirty cards is less than this")\
1869                                                                             \
1870   product(bool, CMSCleanOnEnter, true,                                      \
1871           "Clean-on-enter optimization for reducing number of dirty cards") \
1872                                                                             \
1873   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1874           "Choose variant (1,2) of verification following remark")          \
1875                                                                             \
1876   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1877           "If Eden size is below this, do not try to schedule remark")      \
1878                                                                             \
1879   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1880           "The Eden occupancy percentage (0-100) at which "                 \
1881           "to try and schedule remark pause")                               \
1882                                                                             \
1883   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1884           "Start sampling eden top at least before young gen "              \
1885           "occupancy reaches 1/<ratio> of the size at which "               \
1886           "we plan to schedule remark")                                     \
1887                                                                             \
1888   product(uintx, CMSSamplingGrain, 16*K,                                    \
1889           "The minimum distance between eden samples for CMS (see above)")  \
1890                                                                             \
1891   product(bool, CMSScavengeBeforeRemark, false,                             \
1892           "Attempt scavenge before the CMS remark step")                    \
1893                                                                             \
1894   develop(bool, CMSTraceSweeper, false,                                     \
1895           "Trace some actions of the CMS sweeper")                          \
1896                                                                             \
1897   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1898           "Don't drain below this size per parallel worker/thief")          \
1899                                                                             \
1900   manageable(intx, CMSWaitDuration, 2000,                                   \
1901           "Time in milliseconds that CMS thread waits for young GC")        \
1902                                                                             \
1903   develop(uintx, CMSCheckInterval, 1000,                                    \
1904           "Interval in milliseconds that CMS thread checks if it "          \
1905           "should start a collection cycle")                                \
1906                                                                             \
1907   product(bool, CMSYield, true,                                             \
1908           "Yield between steps of CMS")                                     \
1909                                                                             \
1910   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1911           "Bitmap operations should process at most this many bits "        \
1912           "between yields")                                                 \
1913                                                                             \
1914   product(bool, CMSDumpAtPromotionFailure, false,                           \
1915           "Dump useful information about the state of the CMS old "         \
1916           "generation upon a promotion failure")                            \
1917                                                                             \
1918   product(bool, CMSPrintChunksInDump, false,                                \
1919           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1920           "more detailed information about the free chunks")                \
1921                                                                             \
1922   product(bool, CMSPrintObjectsInDump, false,                               \
1923           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1924           "more detailed information about the allocated objects")          \
1925                                                                             \
1926   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1927           "Verify that all references across the FLS boundary "             \
1928           "are to valid objects")                                           \
1929                                                                             \
1930   diagnostic(bool, FLSVerifyLists, false,                                   \
1931           "Do lots of (expensive) FreeListSpace verification")              \
1932                                                                             \
1933   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1934           "Do lots of (expensive) FLS index table verification")            \
1935                                                                             \
1936   develop(bool, FLSVerifyDictionary, false,                                 \
1937           "Do lots of (expensive) FLS dictionary verification")             \
1938                                                                             \
1939   develop(bool, VerifyBlockOffsetArray, false,                              \
1940           "Do (expensive) block offset array verification")                 \
1941                                                                             \
1942   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1943           "Maintain _unallocated_block in BlockOffsetArray "                \
1944           "(currently applicable only to CMS collector)")                   \
1945                                                                             \
1946   develop(bool, TraceCMSState, false,                                       \
1947           "Trace the state of the CMS collection")                          \
1948                                                                             \
1949   product(intx, RefDiscoveryPolicy, 0,                                      \
1950           "Select type of reference discovery policy: "                     \
1951           "reference-based(0) or referent-based(1)")                        \
1952                                                                             \
1953   product(bool, ParallelRefProcEnabled, false,                              \
1954           "Enable parallel reference processing whenever possible")         \
1955                                                                             \
1956   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1957           "Enable balancing of reference processing queues")                \
1958                                                                             \
1959   product(uintx, CMSTriggerRatio, 80,                                       \
1960           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1961           "allocated before a CMS collection cycle commences")              \
1962                                                                             \
1963   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1964           "Percentage CMS generation occupancy at which to "                \
1965           "initiate CMS collection for bootstrapping collection stats")     \
1966                                                                             \
1967   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1968           "Percentage CMS generation occupancy to start a CMS collection "  \
1969           "cycle. A negative value means that CMSTriggerRatio is used")     \
1970                                                                             \
1971   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1972           "Percentage of the (entire) heap occupancy to start a "           \
1973           "concurrent GC cycle. It is used by GCs that trigger a "          \
1974           "concurrent GC cycle based on the occupancy of the entire heap, " \
1975           "not just one of the generations (e.g., G1). A value of 0 "       \
1976           "denotes 'do constant GC cycles'.")                               \
1977                                                                             \
1978   manageable(intx, CMSTriggerInterval, -1,                                  \
1979           "Commence a CMS collection cycle (at least) every so many "       \
1980           "milliseconds (0 permanently, -1 disabled)")                      \
1981                                                                             \
1982   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1983           "Only use occupancy as a criterion for starting a CMS collection")\
1984                                                                             \
1985   product(uintx, CMSIsTooFullPercentage, 98,                                \
1986           "An absolute ceiling above which CMS will always consider the "   \
1987           "unloading of classes when class unloading is enabled")           \
1988                                                                             \
1989   develop(bool, CMSTestInFreeList, false,                                   \
1990           "Check if the coalesced range is already in the "                 \
1991           "free lists as claimed")                                          \
1992                                                                             \
1993   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1994           "Check that all the garbage collected was returned to the "       \
1995           "free lists")                                                     \
1996                                                                             \
1997   notproduct(bool, ScavengeALot, false,                                     \
1998           "Force scavenge at every Nth exit from the runtime system "       \
1999           "(N=ScavengeALotInterval)")                                       \
2000                                                                             \
2001   develop(bool, FullGCALot, false,                                          \
2002           "Force full gc at every Nth exit from the runtime system "        \
2003           "(N=FullGCALotInterval)")                                         \
2004                                                                             \
2005   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2006           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2007                                                                             \
2008   product(bool, PrintPromotionFailure, false,                               \
2009           "Print additional diagnostic information following "              \
2010           "promotion failure")                                              \
2011                                                                             \
2012   notproduct(bool, PromotionFailureALot, false,                             \
2013           "Use promotion failure handling on every youngest generation "    \
2014           "collection")                                                     \
2015                                                                             \
2016   develop(uintx, PromotionFailureALotCount, 1000,                           \
2017           "Number of promotion failures occurring at ParGCAllocBuffer "     \
2018           "refill attempts (ParNew) or promotion attempts "                 \
2019           "(other young collectors)")                                       \
2020                                                                             \
2021   develop(uintx, PromotionFailureALotInterval, 5,                           \
2022           "Total collections between promotion failures alot")              \
2023                                                                             \
2024   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2025           "Sleep time when sleep is used for yields")                       \
2026                                                                             \
2027   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2028           "Number of yields before a sleep is done during workstealing")    \
2029                                                                             \
2030   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2031           "Number of iterations in a spin loop between checks on "          \
2032           "time out of hard spin")                                          \
2033                                                                             \
2034   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2035           "Ratio of hard spins to calls to yield")                          \
2036                                                                             \
2037   develop(uintx, ObjArrayMarkingStride, 512,                                \
2038           "Number of object array elements to push onto the marking stack " \
2039           "before pushing a continuation entry")                            \
2040                                                                             \
2041   develop(bool, MetadataAllocationFailALot, false,                          \
2042           "Fail metadata allocations at intervals controlled by "           \
2043           "MetadataAllocationFailALotInterval")                             \
2044                                                                             \
2045   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2046           "Metadata allocation failure a lot interval")                     \
2047                                                                             \
2048   develop(bool, TraceMetadataChunkAllocation, false,                        \
2049           "Trace chunk metadata allocations")                               \
2050                                                                             \
2051   product(bool, TraceMetadataHumongousAllocation, false,                    \
2052           "Trace humongous metadata allocations")                           \
2053                                                                             \
2054   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2055           "Trace virtual space metadata allocations")                       \
2056                                                                             \
2057   notproduct(bool, ExecuteInternalVMTests, false,                           \
2058           "Enable execution of internal VM tests")                          \
2059                                                                             \
2060   notproduct(bool, VerboseInternalVMTests, false,                           \
2061           "Turn on logging for internal VM tests.")                         \
2062                                                                             \
2063   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2064                                                                             \
2065   product_pd(bool, ResizeTLAB,                                              \
2066           "Dynamically resize TLAB size for threads")                       \
2067                                                                             \
2068   product(bool, ZeroTLAB, false,                                            \
2069           "Zero out the newly created TLAB")                                \
2070                                                                             \
2071   product(bool, FastTLABRefill, true,                                       \
2072           "Use fast TLAB refill code")                                      \
2073                                                                             \
2074   product(bool, PrintTLAB, false,                                           \
2075           "Print various TLAB related information")                         \
2076                                                                             \
2077   product(bool, TLABStats, true,                                            \
2078           "Provide more detailed and expensive TLAB statistics "            \
2079           "(with PrintTLAB)")                                               \
2080                                                                             \
2081   product_pd(bool, NeverActAsServerClassMachine,                            \
2082           "Never act like a server-class machine")                          \
2083                                                                             \
2084   product(bool, AlwaysActAsServerClassMachine, false,                       \
2085           "Always act like a server-class machine")                         \
2086                                                                             \
2087   product_pd(uint64_t, MaxRAM,                                              \
2088           "Real memory size (in bytes) used to set maximum heap size")      \
2089                                                                             \
2090   product(bool, AggressiveHeap, false,                                      \
2091           "Optimize heap options for long-running memory intensive apps")   \
2092                                                                             \
2093   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2094           "Maximum ergonomically set heap size (in bytes); zero means use " \
2095           "MaxRAM * MaxRAMPercentage / 100")                                \
2096                                                                             \
2097   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2098           "Use CGroup memory limit as physical memory limit for heap "      \
2099           "sizing"                                                          \
2100           "Deprecated, replaced by container support")                      \
2101                                                                             \
2102   diagnostic(bool, PrintContainerInfo, false,                               \
2103           "Print container related information")                            \
2104                                                                             \
2105   diagnostic(bool, PrintActiveCpus, false,                                  \
2106            "Print the number of CPUs detected in os::active_processor_count") \
2107                                                                             \
2108   product(uintx, MaxRAMFraction, 4,                                         \
2109           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2110           "size")                                                           \
2111                                                                             \
2112   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2113           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2114           "size; deprecated: to be renamed to MaxRAMFraction")              \
2115                                                                             \
2116   product(uintx, MinRAMFraction, 2,                                         \
2117           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2118           "size on systems with small physical memory size")                \
2119                                                                             \
2120   product(uintx, InitialRAMFraction, 64,                                    \
2121           "Fraction (1/n) of real memory used for initial heap size")       \
2122                                                                             \
2123   product(double, MaxRAMPercentage, 25.0,                                   \
2124           "Maximum percentage of real memory used for maximum heap size")   \
2125                                                                             \
2126   product(double, MinRAMPercentage, 50.0,                                   \
2127           "Minimum percentage of real memory used for maximum heap"         \
2128           "size on systems with small physical memory size")                \
2129                                                                             \
2130   product(double, InitialRAMPercentage, 1.5625,                             \
2131           "Percentage of real memory used for initial heap size")           \
2132                                                                             \
2133   product(intx, ActiveProcessorCount, -1,                                   \
2134           "Specify the CPU count the VM should use and report as active")   \
2135                                                                             \
2136   develop(uintx, MaxVirtMemFraction, 2,                                     \
2137           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2138           "determining maximum heap size")                                  \
2139                                                                             \
2140   product(bool, UseAutoGCSelectPolicy, false,                               \
2141           "Use automatic collection selection policy")                      \
2142                                                                             \
2143   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2144           "Automatic GC selection pause threshold in milliseconds")         \
2145                                                                             \
2146   product(bool, UseAdaptiveSizePolicy, true,                                \
2147           "Use adaptive generation sizing policies")                        \
2148                                                                             \
2149   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2150           "Use adaptive survivor sizing policies")                          \
2151                                                                             \
2152   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2153           "Use adaptive young-old sizing policies at minor collections")    \
2154                                                                             \
2155   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2156           "Use adaptive young-old sizing policies at major collections")    \
2157                                                                             \
2158   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2159           "Include statistics from System.gc() for adaptive size policy")   \
2160                                                                             \
2161   product(bool, UseAdaptiveGCBoundary, false,                               \
2162           "Allow young-old boundary to move")                               \
2163                                                                             \
2164   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2165           "Trace young-old boundary moves")                                 \
2166                                                                             \
2167   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2168           "Resize the virtual spaces of the young or old generations")      \
2169                                                                             \
2170   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2171           "Policy for changing generation size for throughput goals")       \
2172                                                                             \
2173   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2174           "Policy for changing generation size for pause goals")            \
2175                                                                             \
2176   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2177           "Adjust tenured generation to achieve a minor pause goal")        \
2178                                                                             \
2179   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2180           "Adjust young generation to achieve a major pause goal")          \
2181                                                                             \
2182   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2183           "Number of steps where heuristics is used before data is used")   \
2184                                                                             \
2185   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2186           "Number of collections before the adaptive sizing is started")    \
2187                                                                             \
2188   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2189           "Collection interval for printing information; zero means never") \
2190                                                                             \
2191   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2192           "Use adaptive minimum footprint as a goal")                       \
2193                                                                             \
2194   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2195           "Weight given to exponential resizing, between 0 and 100")        \
2196                                                                             \
2197   product(uintx, AdaptiveTimeWeight,       25,                              \
2198           "Weight given to time in adaptive policy, between 0 and 100")     \
2199                                                                             \
2200   product(uintx, PausePadding, 1,                                           \
2201           "How much buffer to keep for pause time")                         \
2202                                                                             \
2203   product(uintx, PromotedPadding, 3,                                        \
2204           "How much buffer to keep for promotion failure")                  \
2205                                                                             \
2206   product(uintx, SurvivorPadding, 3,                                        \
2207           "How much buffer to keep for survivor overflow")                  \
2208                                                                             \
2209   product(uintx, ThresholdTolerance, 10,                                    \
2210           "Allowed collection cost difference between generations")         \
2211                                                                             \
2212   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2213           "If collection costs are within margin, reduce both by full "     \
2214           "delta")                                                          \
2215                                                                             \
2216   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2217           "Adaptive size percentage change in young generation")            \
2218                                                                             \
2219   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2220           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2221                                                                             \
2222   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2223           "Decay factor to YoungedGenerationSizeSupplement")                \
2224                                                                             \
2225   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2226           "Adaptive size percentage change in tenured generation")          \
2227                                                                             \
2228   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2229           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2230                                                                             \
2231   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2232           "Decay factor to TenuredGenerationSizeIncrement")                 \
2233                                                                             \
2234   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2235           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2236           "or (G1 Only) the maximum GC time per MMU time slice")            \
2237                                                                             \
2238   product(uintx, GCPauseIntervalMillis, 0,                                  \
2239           "Time slice for MMU specification")                               \
2240                                                                             \
2241   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2242           "Adaptive size policy maximum GC minor pause time goal "          \
2243           "in millisecond")                                                 \
2244                                                                             \
2245   product(uintx, GCTimeRatio, 99,                                           \
2246           "Adaptive size policy application time to GC time ratio")         \
2247                                                                             \
2248   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2249           "Adaptive size scale down factor for shrinking")                  \
2250                                                                             \
2251   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2252           "Adaptive size decays the major cost for long major intervals")   \
2253                                                                             \
2254   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2255           "Time scale over which major costs decay")                        \
2256                                                                             \
2257   product(uintx, MinSurvivorRatio, 3,                                       \
2258           "Minimum ratio of young generation/survivor space size")          \
2259                                                                             \
2260   product(uintx, InitialSurvivorRatio, 8,                                   \
2261           "Initial ratio of young generation/survivor space size")          \
2262                                                                             \
2263   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2264           "Estimate of footprint other than Java Heap")                     \
2265                                                                             \
2266   product(bool, UseGCOverheadLimit, true,                                   \
2267           "Use policy to limit of proportion of time spent in GC "          \
2268           "before an OutOfMemory error is thrown")                          \
2269                                                                             \
2270   product(uintx, GCTimeLimit, 98,                                           \
2271           "Limit of the proportion of time spent in GC before "             \
2272           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2273                                                                             \
2274   product(uintx, GCHeapFreeLimit, 2,                                        \
2275           "Minimum percentage of free space after a full GC before an "     \
2276           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2277                                                                             \
2278   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2279           "Number of consecutive collections before gc time limit fires")   \
2280                                                                             \
2281   product(bool, PrintAdaptiveSizePolicy, false,                             \
2282           "Print information about AdaptiveSizePolicy")                     \
2283                                                                             \
2284   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2285           "How far ahead to prefetch destination area (<= 0 means off)")    \
2286                                                                             \
2287   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2288           "How far ahead to prefetch scan area (<= 0 means off)")           \
2289                                                                             \
2290   product(intx, PrefetchFieldsAhead, -1,                                    \
2291           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2292                                                                             \
2293   diagnostic(bool, VerifySilently, false,                                   \
2294           "Do not print the verification progress")                         \
2295                                                                             \
2296   diagnostic(bool, VerifyDuringStartup, false,                              \
2297           "Verify memory system before executing any Java code "            \
2298           "during VM initialization")                                       \
2299                                                                             \
2300   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2301           "Verify system before exiting")                                   \
2302                                                                             \
2303   diagnostic(bool, VerifyBeforeGC, false,                                   \
2304           "Verify memory system before GC")                                 \
2305                                                                             \
2306   diagnostic(bool, VerifyAfterGC, false,                                    \
2307           "Verify memory system after GC")                                  \
2308                                                                             \
2309   diagnostic(bool, VerifyDuringGC, false,                                   \
2310           "Verify memory system during GC (between phases)")                \
2311                                                                             \
2312   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2313           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2314           "are enabled. One or more sub-systems can be specified "          \
2315           "in a comma separated string. Sub-systems are: "                  \
2316           "threads, heap, symbol_table, string_table, codecache, "          \
2317           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2318           "c-heap, codecache_oops")                                         \
2319                                                                             \
2320   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2321           "Enable parallel memory system verification")                     \
2322                                                                             \
2323   diagnostic(bool, DeferInitialCardMark, false,                             \
2324           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2325           "may arise from new_pre_store_barrier")                           \
2326                                                                             \
2327   diagnostic(bool, VerifyRememberedSets, false,                             \
2328           "Verify GC remembered sets")                                      \
2329                                                                             \
2330   diagnostic(bool, VerifyObjectStartArray, true,                            \
2331           "Verify GC object start array if verify before/after")            \
2332                                                                             \
2333   product(bool, DisableExplicitGC, false,                                   \
2334           "Ignore calls to System.gc()")                                    \
2335                                                                             \
2336   notproduct(bool, CheckMemoryInitialization, false,                        \
2337           "Check memory initialization")                                    \
2338                                                                             \
2339   product(bool, CollectGen0First, false,                                    \
2340           "Collect youngest generation before each full GC")                \
2341                                                                             \
2342   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2343           "Bind CMS Thread to CPU if possible")                             \
2344                                                                             \
2345   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2346           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2347                                                                             \
2348   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2349           "Bind GCTaskThreads to CPUs if possible")                         \
2350                                                                             \
2351   product(bool, UseGCTaskAffinity, false,                                   \
2352           "Use worker affinity when asking for GCTasks")                    \
2353                                                                             \
2354   product(uintx, ProcessDistributionStride, 4,                              \
2355           "Stride through processors when distributing processes")          \
2356                                                                             \
2357   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2358           "Number of times the coordinator GC thread will sleep while "     \
2359           "yielding before giving up and resuming GC")                      \
2360                                                                             \
2361   product(uintx, CMSYieldSleepCount, 0,                                     \
2362           "Number of times a GC thread (minus the coordinator) "            \
2363           "will sleep while yielding before giving up and resuming GC")     \
2364                                                                             \
2365   /* gc tracing */                                                          \
2366   manageable(bool, PrintGC, false,                                          \
2367           "Print message at garbage collection")                            \
2368                                                                             \
2369   manageable(bool, PrintGCDetails, false,                                   \
2370           "Print more details at garbage collection")                       \
2371                                                                             \
2372   manageable(bool, PrintGCDateStamps, false,                                \
2373           "Print date stamps at garbage collection")                        \
2374                                                                             \
2375   manageable(bool, PrintGCTimeStamps, false,                                \
2376           "Print timestamps at garbage collection")                         \
2377                                                                             \
2378   manageable(bool, PrintGCID, false,                                        \
2379           "Print an identifier for each garbage collection")                \
2380                                                                             \
2381   product(bool, PrintGCTaskTimeStamps, false,                               \
2382           "Print timestamps for individual gc worker thread tasks")         \
2383                                                                             \
2384   develop(intx, ConcGCYieldTimeout, 0,                                      \
2385           "If non-zero, assert that GC threads yield within this "          \
2386           "number of milliseconds")                                         \
2387                                                                             \
2388   notproduct(bool, TraceMarkSweep, false,                                   \
2389           "Trace mark sweep")                                               \
2390                                                                             \
2391   product(bool, PrintReferenceGC, false,                                    \
2392           "Print times spent handling reference objects during GC "         \
2393           "(enabled only when PrintGCDetails)")                             \
2394                                                                             \
2395   develop(bool, TraceReferenceGC, false,                                    \
2396           "Trace handling of soft/weak/final/phantom references")           \
2397                                                                             \
2398   develop(bool, TraceFinalizerRegistration, false,                          \
2399           "Trace registration of final references")                         \
2400                                                                             \
2401   notproduct(bool, TraceScavenge, false,                                    \
2402           "Trace scavenge")                                                 \
2403                                                                             \
2404   product(bool, IgnoreEmptyClassPaths, false,                               \
2405           "Ignore empty path elements in -classpath")                       \
2406                                                                             \
2407   product(bool, TraceClassPaths, false,                                     \
2408           "Trace processing of class paths")                                \
2409                                                                             \
2410   product_rw(bool, TraceClassLoading, false,                                \
2411           "Trace all classes loaded")                                       \
2412                                                                             \
2413   product(bool, TraceClassLoadingPreorder, false,                           \
2414           "Trace all classes loaded in order referenced (not loaded)")      \
2415                                                                             \
2416   product_rw(bool, TraceClassUnloading, false,                              \
2417           "Trace unloading of classes")                                     \
2418                                                                             \
2419   product_rw(bool, TraceLoaderConstraints, false,                           \
2420           "Trace loader constraints")                                       \
2421                                                                             \
2422   develop(bool, TraceClassLoaderData, false,                                \
2423           "Trace class loader loader_data lifetime")                        \
2424                                                                             \
2425   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2426           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2427           "Initial size of the boot class loader data metaspace")           \
2428                                                                             \
2429   product(bool, TraceGen0Time, false,                                       \
2430           "Trace accumulated time for Gen 0 collection")                    \
2431                                                                             \
2432   product(bool, TraceGen1Time, false,                                       \
2433           "Trace accumulated time for Gen 1 collection")                    \
2434                                                                             \
2435   product(bool, PrintTenuringDistribution, false,                           \
2436           "Print tenuring age information")                                 \
2437                                                                             \
2438   product_rw(bool, PrintHeapAtGC, false,                                    \
2439           "Print heap layout before and after each GC")                     \
2440                                                                             \
2441   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2442           "Print extended information about the layout of the heap "        \
2443           "when -XX:+PrintHeapAtGC is set")                                 \
2444                                                                             \
2445   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2446           "Print heap layout in response to SIGBREAK")                      \
2447                                                                             \
2448   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2449           "Print a class histogram before any major stop-world GC")         \
2450                                                                             \
2451   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2452           "Print a class histogram after any major stop-world GC")          \
2453                                                                             \
2454   manageable(bool, PrintClassHistogram, false,                              \
2455           "Print a histogram of class instances")                           \
2456                                                                             \
2457   develop(bool, TraceWorkGang, false,                                       \
2458           "Trace activities of work gangs")                                 \
2459                                                                             \
2460   product(bool, TraceParallelOldGCTasks, false,                             \
2461           "Trace multithreaded GC activity")                                \
2462                                                                             \
2463   develop(bool, TraceBlockOffsetTable, false,                               \
2464           "Print BlockOffsetTable maps")                                    \
2465                                                                             \
2466   develop(bool, TraceCardTableModRefBS, false,                              \
2467           "Print CardTableModRefBS maps")                                   \
2468                                                                             \
2469   develop(bool, TraceGCTaskManager, false,                                  \
2470           "Trace actions of the GC task manager")                           \
2471                                                                             \
2472   develop(bool, TraceGCTaskQueue, false,                                    \
2473           "Trace actions of the GC task queues")                            \
2474                                                                             \
2475   diagnostic(bool, TraceGCTaskThread, false,                                \
2476           "Trace actions of the GC task threads")                           \
2477                                                                             \
2478   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2479           "Print the time taken by each phase in ParallelOldGC "            \
2480           "(PrintGCDetails must also be enabled)")                          \
2481                                                                             \
2482   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2483           "Trace marking phase in ParallelOldGC")                           \
2484                                                                             \
2485   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2486           "Trace summary phase in ParallelOldGC")                           \
2487                                                                             \
2488   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2489           "Trace compaction phase in ParallelOldGC")                        \
2490                                                                             \
2491   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2492           "Trace dense prefix computation for ParallelOldGC")               \
2493                                                                             \
2494   develop(bool, IgnoreLibthreadGPFault, false,                              \
2495           "Suppress workaround for libthread GP fault")                     \
2496                                                                             \
2497   product(bool, PrintJNIGCStalls, false,                                    \
2498           "Print diagnostic message when GC is stalled "                    \
2499           "by JNI critical section")                                        \
2500                                                                             \
2501   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2502           "The percentage of the used heap that the instances of a class "  \
2503           "must occupy for the class to generate a trace event")            \
2504                                                                             \
2505   /* GC log rotation setting */                                             \
2506                                                                             \
2507   product(bool, UseGCLogFileRotation, false,                                \
2508           "Rotate gclog files (for long running applications). It requires "\
2509           "-Xloggc:<filename>")                                             \
2510                                                                             \
2511   product(uintx, NumberOfGCLogFiles, 0,                                     \
2512           "Number of gclog files in rotation "                              \
2513           "(default: 0, no rotation)")                                      \
2514                                                                             \
2515   product(uintx, GCLogFileSize, 8*K,                                        \
2516           "GC log file size, requires UseGCLogFileRotation. "               \
2517           "Set to 0 to only trigger rotation via jcmd")                     \
2518                                                                             \
2519   /* JVMTI heap profiling */                                                \
2520                                                                             \
2521   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2522           "Trace JVMTI object tagging calls")                               \
2523                                                                             \
2524   diagnostic(bool, VerifyBeforeIteration, false,                            \
2525           "Verify memory system before JVMTI iteration")                    \
2526                                                                             \
2527   /* compiler interface */                                                  \
2528                                                                             \
2529   develop(bool, CIPrintCompilerName, false,                                 \
2530           "when CIPrint is active, print the name of the active compiler")  \
2531                                                                             \
2532   develop(bool, CIPrintCompileQueue, false,                                 \
2533           "display the contents of the compile queue whenever a "           \
2534           "compilation is enqueued")                                        \
2535                                                                             \
2536   develop(bool, CIPrintRequests, false,                                     \
2537           "display every request for compilation")                          \
2538                                                                             \
2539   product(bool, CITime, false,                                              \
2540           "collect timing information for compilation")                     \
2541                                                                             \
2542   develop(bool, CITimeEach, false,                                          \
2543           "display timing information after each successful compilation")   \
2544                                                                             \
2545   develop(bool, CICountOSR, false,                                          \
2546           "use a separate counter when assigning ids to osr compilations")  \
2547                                                                             \
2548   develop(bool, CICompileNatives, true,                                     \
2549           "compile native methods if supported by the compiler")            \
2550                                                                             \
2551   develop_pd(bool, CICompileOSR,                                            \
2552           "compile on stack replacement methods if supported by the "       \
2553           "compiler")                                                       \
2554                                                                             \
2555   develop(bool, CIPrintMethodCodes, false,                                  \
2556           "print method bytecodes of the compiled code")                    \
2557                                                                             \
2558   develop(bool, CIPrintTypeFlow, false,                                     \
2559           "print the results of ciTypeFlow analysis")                       \
2560                                                                             \
2561   develop(bool, CITraceTypeFlow, false,                                     \
2562           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2563                                                                             \
2564   develop(intx, OSROnlyBCI, -1,                                             \
2565           "OSR only at this bci.  Negative values mean exclude that bci")   \
2566                                                                             \
2567   /* compiler */                                                            \
2568                                                                             \
2569   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2570           "Number of compiler threads to run")                              \
2571                                                                             \
2572   product(intx, CompilationPolicyChoice, 0,                                 \
2573           "which compilation policy (0/1)")                                 \
2574                                                                             \
2575   develop(bool, UseStackBanging, true,                                      \
2576           "use stack banging for stack overflow checks (required for "      \
2577           "proper StackOverflow handling; disable only to measure cost "    \
2578           "of stackbanging)")                                               \
2579                                                                             \
2580   develop(bool, UseStrictFP, true,                                          \
2581           "use strict fp if modifier strictfp is set")                      \
2582                                                                             \
2583   develop(bool, GenerateSynchronizationCode, true,                          \
2584           "generate locking/unlocking code for synchronized methods and "   \
2585           "monitors")                                                       \
2586                                                                             \
2587   develop(bool, GenerateCompilerNullChecks, true,                           \
2588           "Generate explicit null checks for loads/stores/calls")           \
2589                                                                             \
2590   develop(bool, GenerateRangeChecks, true,                                  \
2591           "Generate range checks for array accesses")                       \
2592                                                                             \
2593   develop_pd(bool, ImplicitNullChecks,                                      \
2594           "Generate code for implicit null checks")                         \
2595                                                                             \
2596   product_pd(bool, TrapBasedNullChecks,                                     \
2597           "Generate code for null checks that uses a cmp and trap "         \
2598           "instruction raising SIGTRAP.  This is only used if an access to" \
2599           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2600           "ImplicitNullChecks don't work (PPC64).")                         \
2601                                                                             \
2602   product(bool, PrintSafepointStatistics, false,                            \
2603           "Print statistics about safepoint synchronization")               \
2604                                                                             \
2605   product(intx, PrintSafepointStatisticsCount, 300,                         \
2606           "Total number of safepoint statistics collected "                 \
2607           "before printing them out")                                       \
2608                                                                             \
2609   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2610           "Print safepoint statistics only when safepoint takes "           \
2611           "more than PrintSafepointSatisticsTimeout in millis")             \
2612                                                                             \
2613   product(bool, TraceSafepointCleanupTime, false,                           \
2614           "Print the break down of clean up tasks performed during "        \
2615           "safepoint")                                                      \
2616                                                                             \
2617   product(bool, Inline, true,                                               \
2618           "Enable inlining")                                                \
2619                                                                             \
2620   product(bool, ClipInlining, true,                                         \
2621           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2622                                                                             \
2623   develop(bool, UseCHA, true,                                               \
2624           "Enable CHA")                                                     \
2625                                                                             \
2626   product(bool, UseTypeProfile, true,                                       \
2627           "Check interpreter profile for historically monomorphic calls")   \
2628                                                                             \
2629   notproduct(bool, TimeCompiler, false,                                     \
2630           "Time the compiler")                                              \
2631                                                                             \
2632   diagnostic(bool, PrintInlining, false,                                    \
2633           "Print inlining optimizations")                                   \
2634                                                                             \
2635   product(bool, UsePopCountInstruction, false,                              \
2636           "Use population count instruction")                               \
2637                                                                             \
2638   develop(bool, EagerInitialization, false,                                 \
2639           "Eagerly initialize classes if possible")                         \
2640                                                                             \
2641   develop(bool, TraceMethodReplacement, false,                              \
2642           "Print when methods are replaced do to recompilation")            \
2643                                                                             \
2644   develop(bool, PrintMethodFlushing, false,                                 \
2645           "Print the nmethods being flushed")                               \
2646                                                                             \
2647   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2648           "print statistics about method flushing")                         \
2649                                                                             \
2650   develop(bool, UseRelocIndex, false,                                       \
2651           "Use an index to speed random access to relocations")             \
2652                                                                             \
2653   develop(bool, StressCodeBuffers, false,                                   \
2654           "Exercise code buffer expansion and other rare state changes")    \
2655                                                                             \
2656   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2657           "Generate extra debugging information for non-safepoints in "     \
2658           "nmethods")                                                       \
2659                                                                             \
2660   product(bool, PrintVMOptions, false,                                      \
2661           "Print flags that appeared on the command line")                  \
2662                                                                             \
2663   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2664           "Ignore unrecognized VM options")                                 \
2665                                                                             \
2666   product(bool, PrintCommandLineFlags, false,                               \
2667           "Print flags specified on command line or set by ergonomics")     \
2668                                                                             \
2669   product(bool, PrintFlagsInitial, false,                                   \
2670           "Print all VM flags before argument processing and exit VM")      \
2671                                                                             \
2672   product(bool, PrintFlagsFinal, false,                                     \
2673           "Print all VM flags after argument and ergonomic processing")     \
2674                                                                             \
2675   notproduct(bool, PrintFlagsWithComments, false,                           \
2676           "Print all VM flags with default values and descriptions and "    \
2677           "exit")                                                           \
2678                                                                             \
2679   diagnostic(bool, SerializeVMOutput, true,                                 \
2680           "Use a mutex to serialize output to tty and LogFile")             \
2681                                                                             \
2682   diagnostic(bool, DisplayVMOutput, true,                                   \
2683           "Display all VM output on the tty, independently of LogVMOutput") \
2684                                                                             \
2685   diagnostic(bool, LogVMOutput, false,                                      \
2686           "Save VM output to LogFile")                                      \
2687                                                                             \
2688   diagnostic(ccstr, LogFile, NULL,                                          \
2689           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2690           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2691                                                                             \
2692   product(ccstr, ErrorFile, NULL,                                           \
2693           "If an error occurs, save the error data to this file "           \
2694           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2695                                                                             \
2696   product(bool, DisplayVMOutputToStderr, false,                             \
2697           "If DisplayVMOutput is true, display all VM output to stderr")    \
2698                                                                             \
2699   product(bool, DisplayVMOutputToStdout, false,                             \
2700           "If DisplayVMOutput is true, display all VM output to stdout")    \
2701                                                                             \
2702   product(bool, UseHeavyMonitors, false,                                    \
2703           "use heavyweight instead of lightweight Java monitors")           \
2704                                                                             \
2705   product(bool, PrintStringTableStatistics, false,                          \
2706           "print statistics about the StringTable and SymbolTable")         \
2707                                                                             \
2708   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2709           "verify StringTable contents at exit")                            \
2710                                                                             \
2711   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2712           "print histogram of the symbol table")                            \
2713                                                                             \
2714   notproduct(bool, ExitVMOnVerifyError, false,                              \
2715           "standard exit from VM if bytecode verify error "                 \
2716           "(only in debug mode)")                                           \
2717                                                                             \
2718   notproduct(ccstr, AbortVMOnException, NULL,                               \
2719           "Call fatal if this exception is thrown.  Example: "              \
2720           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2721                                                                             \
2722   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2723           "Call fatal if the exception pointed by AbortVMOnException "      \
2724           "has this message")                                               \
2725                                                                             \
2726   develop(bool, DebugVtables, false,                                        \
2727           "add debugging code to vtable dispatch")                          \
2728                                                                             \
2729   develop(bool, PrintVtables, false,                                        \
2730           "print vtables when printing klass")                              \
2731                                                                             \
2732   notproduct(bool, PrintVtableStats, false,                                 \
2733           "print vtables stats at end of run")                              \
2734                                                                             \
2735   develop(bool, TraceCreateZombies, false,                                  \
2736           "trace creation of zombie nmethods")                              \
2737                                                                             \
2738   notproduct(bool, IgnoreLockingAssertions, false,                          \
2739           "disable locking assertions (for speed)")                         \
2740                                                                             \
2741   product(bool, RangeCheckElimination, true,                                \
2742           "Eliminate range checks")                                         \
2743                                                                             \
2744   develop_pd(bool, UncommonNullCast,                                        \
2745           "track occurrences of null in casts; adjust compiler tactics")    \
2746                                                                             \
2747   develop(bool, TypeProfileCasts,  true,                                    \
2748           "treat casts like calls for purposes of type profiling")          \
2749                                                                             \
2750   develop(bool, DelayCompilationDuringStartup, true,                        \
2751           "Delay invoking the compiler until main application class is "    \
2752           "loaded")                                                         \
2753                                                                             \
2754   develop(bool, CompileTheWorld, false,                                     \
2755           "Compile all methods in all classes in bootstrap class path "     \
2756           "(stress test)")                                                  \
2757                                                                             \
2758   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2759           "Preload all classes used by a class before start loading")       \
2760                                                                             \
2761   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2762           "Force a safepoint every n compiles so sweeper can keep up")      \
2763                                                                             \
2764   develop(bool, FillDelaySlots, true,                                       \
2765           "Fill delay slots (on SPARC only)")                               \
2766                                                                             \
2767   develop(bool, TimeLivenessAnalysis, false,                                \
2768           "Time computation of bytecode liveness analysis")                 \
2769                                                                             \
2770   develop(bool, TraceLivenessGen, false,                                    \
2771           "Trace the generation of liveness analysis information")          \
2772                                                                             \
2773   notproduct(bool, TraceLivenessQuery, false,                               \
2774           "Trace queries of liveness analysis information")                 \
2775                                                                             \
2776   notproduct(bool, CollectIndexSetStatistics, false,                        \
2777           "Collect information about IndexSets")                            \
2778                                                                             \
2779   develop(bool, UseLoopSafepoints, true,                                    \
2780           "Generate Safepoint nodes in every loop")                         \
2781                                                                             \
2782   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2783           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2784           "Inline allocations larger than this in doublewords must go slow")\
2785                                                                             \
2786   product(bool, AggressiveOpts, false,                                      \
2787           "Enable aggressive optimizations - see arguments.cpp")            \
2788                                                                             \
2789   product_pd(uintx, TypeProfileLevel,                                       \
2790           "=XYZ, with Z: Type profiling of arguments at call; "             \
2791                      "Y: Type profiling of return value at call; "          \
2792                      "X: Type profiling of parameters to methods; "         \
2793           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2794                                                                             \
2795   product(intx, TypeProfileArgsLimit,     2,                                \
2796           "max number of call arguments to consider for type profiling")    \
2797                                                                             \
2798   product(intx, TypeProfileParmsLimit,    2,                                \
2799           "max number of incoming parameters to consider for type profiling"\
2800           ", -1 for all")                                                   \
2801                                                                             \
2802   /* statistics */                                                          \
2803   develop(bool, CountCompiledCalls, false,                                  \
2804           "Count method invocations")                                       \
2805                                                                             \
2806   notproduct(bool, CountRuntimeCalls, false,                                \
2807           "Count VM runtime calls")                                         \
2808                                                                             \
2809   develop(bool, CountJNICalls, false,                                       \
2810           "Count jni method invocations")                                   \
2811                                                                             \
2812   notproduct(bool, CountJVMCalls, false,                                    \
2813           "Count jvm method invocations")                                   \
2814                                                                             \
2815   notproduct(bool, CountRemovableExceptions, false,                         \
2816           "Count exceptions that could be replaced by branches due to "     \
2817           "inlining")                                                       \
2818                                                                             \
2819   notproduct(bool, ICMissHistogram, false,                                  \
2820           "Produce histogram of IC misses")                                 \
2821                                                                             \
2822   notproduct(bool, PrintClassStatistics, false,                             \
2823           "Print class statistics at end of run")                           \
2824                                                                             \
2825   notproduct(bool, PrintMethodStatistics, false,                            \
2826           "Print method statistics at end of run")                          \
2827                                                                             \
2828   /* interpreter */                                                         \
2829   develop(bool, ClearInterpreterLocals, false,                              \
2830           "Always clear local variables of interpreter activations upon "   \
2831           "entry")                                                          \
2832                                                                             \
2833   product_pd(bool, RewriteBytecodes,                                        \
2834           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2835                                                                             \
2836   product_pd(bool, RewriteFrequentPairs,                                    \
2837           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2838                                                                             \
2839   diagnostic(bool, PrintInterpreter, false,                                 \
2840           "Print the generated interpreter code")                           \
2841                                                                             \
2842   product(bool, UseInterpreter, true,                                       \
2843           "Use interpreter for non-compiled methods")                       \
2844                                                                             \
2845   develop(bool, UseFastSignatureHandlers, true,                             \
2846           "Use fast signature handlers for native calls")                   \
2847                                                                             \
2848   product(bool, UseLoopCounter, true,                                       \
2849           "Increment invocation counter on backward branch")                \
2850                                                                             \
2851   product(bool, UseFastEmptyMethods, true,                                  \
2852           "Use fast method entry code for empty methods")                   \
2853                                                                             \
2854   product(bool, UseFastAccessorMethods, true,                               \
2855           "Use fast method entry code for accessor methods")                \
2856                                                                             \
2857   product_pd(bool, UseOnStackReplacement,                                   \
2858           "Use on stack replacement, calls runtime if invoc. counter "      \
2859           "overflows in loop")                                              \
2860                                                                             \
2861   notproduct(bool, TraceOnStackReplacement, false,                          \
2862           "Trace on stack replacement")                                     \
2863                                                                             \
2864   product_pd(bool, PreferInterpreterNativeStubs,                            \
2865           "Use always interpreter stubs for native methods invoked via "    \
2866           "interpreter")                                                    \
2867                                                                             \
2868   develop(bool, CountBytecodes, false,                                      \
2869           "Count number of bytecodes executed")                             \
2870                                                                             \
2871   develop(bool, PrintBytecodeHistogram, false,                              \
2872           "Print histogram of the executed bytecodes")                      \
2873                                                                             \
2874   develop(bool, PrintBytecodePairHistogram, false,                          \
2875           "Print histogram of the executed bytecode pairs")                 \
2876                                                                             \
2877   diagnostic(bool, PrintSignatureHandlers, false,                           \
2878           "Print code generated for native method signature handlers")      \
2879                                                                             \
2880   develop(bool, VerifyOops, false,                                          \
2881           "Do plausibility checks for oops")                                \
2882                                                                             \
2883   develop(bool, CheckUnhandledOops, false,                                  \
2884           "Check for unhandled oops in VM code")                            \
2885                                                                             \
2886   develop(bool, VerifyJNIFields, trueInDebug,                               \
2887           "Verify jfieldIDs for instance fields")                           \
2888                                                                             \
2889   notproduct(bool, VerifyJNIEnvThread, false,                               \
2890           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2891           "from JNI")                                                       \
2892                                                                             \
2893   develop(bool, VerifyFPU, false,                                           \
2894           "Verify FPU state (check for NaN's, etc.)")                       \
2895                                                                             \
2896   develop(bool, VerifyThread, false,                                        \
2897           "Watch the thread register for corruption (SPARC only)")          \
2898                                                                             \
2899   develop(bool, VerifyActivationFrameSize, false,                           \
2900           "Verify that activation frame didn't become smaller than its "    \
2901           "minimal size")                                                   \
2902                                                                             \
2903   develop(bool, TraceFrequencyInlining, false,                              \
2904           "Trace frequency based inlining")                                 \
2905                                                                             \
2906   develop_pd(bool, InlineIntrinsics,                                        \
2907           "Inline intrinsics that can be statically resolved")              \
2908                                                                             \
2909   product_pd(bool, ProfileInterpreter,                                      \
2910           "Profile at the bytecode level during interpretation")            \
2911                                                                             \
2912   develop(bool, TraceProfileInterpreter, false,                             \
2913           "Trace profiling at the bytecode level during interpretation. "   \
2914           "This outputs the profiling information collected to improve "    \
2915           "jit compilation.")                                               \
2916                                                                             \
2917   develop_pd(bool, ProfileTraps,                                            \
2918           "Profile deoptimization traps at the bytecode level")             \
2919                                                                             \
2920   product(intx, ProfileMaturityPercentage, 20,                              \
2921           "number of method invocations/branches (expressed as % of "       \
2922           "CompileThreshold) before using the method's profile")            \
2923                                                                             \
2924   develop(bool, PrintMethodData, false,                                     \
2925           "Print the results of +ProfileInterpreter at end of run")         \
2926                                                                             \
2927   develop(bool, VerifyDataPointer, trueInDebug,                             \
2928           "Verify the method data pointer during interpreter profiling")    \
2929                                                                             \
2930   develop(bool, VerifyCompiledCode, false,                                  \
2931           "Include miscellaneous runtime verifications in nmethod code; "   \
2932           "default off because it disturbs nmethod size heuristics")        \
2933                                                                             \
2934   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2935           "Manually make GC thread crash then dump java stack trace;  "     \
2936           "Test only")                                                      \
2937                                                                             \
2938   /* compilation */                                                         \
2939   product(bool, UseCompiler, true,                                          \
2940           "Use Just-In-Time compilation")                                   \
2941                                                                             \
2942   develop(bool, TraceCompilationPolicy, false,                              \
2943           "Trace compilation policy")                                       \
2944                                                                             \
2945   develop(bool, TimeCompilationPolicy, false,                               \
2946           "Time the compilation policy")                                    \
2947                                                                             \
2948   product(bool, UseCounterDecay, true,                                      \
2949           "Adjust recompilation counters")                                  \
2950                                                                             \
2951   develop(intx, CounterHalfLifeTime,    30,                                 \
2952           "Half-life time of invocation counters (in seconds)")             \
2953                                                                             \
2954   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2955           "The minimum interval (in milliseconds) between invocation of "   \
2956           "CounterDecay")                                                   \
2957                                                                             \
2958   product(bool, AlwaysCompileLoopMethods, false,                            \
2959           "When using recompilation, never interpret methods "              \
2960           "containing loops")                                               \
2961                                                                             \
2962   product(bool, DontCompileHugeMethods, true,                               \
2963           "Do not compile methods > HugeMethodLimit")                       \
2964                                                                             \
2965   /* Bytecode escape analysis estimation. */                                \
2966   product(bool, EstimateArgEscape, true,                                    \
2967           "Analyze bytecodes to estimate escape state of arguments")        \
2968                                                                             \
2969   product(intx, BCEATraceLevel, 0,                                          \
2970           "How much tracing to do of bytecode escape analysis estimates")   \
2971                                                                             \
2972   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2973           "Maximum number of nested calls that are analyzed by BC EA")      \
2974                                                                             \
2975   product(intx, MaxBCEAEstimateSize, 150,                                   \
2976           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2977                                                                             \
2978   product(intx,  AllocatePrefetchStyle, 1,                                  \
2979           "0 = no prefetch, "                                               \
2980           "1 = prefetch instructions for each allocation, "                 \
2981           "2 = use TLAB watermark to gate allocation prefetch, "            \
2982           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2983                                                                             \
2984   product(intx,  AllocatePrefetchDistance, -1,                              \
2985           "Distance to prefetch ahead of allocation pointer")               \
2986                                                                             \
2987   product(intx,  AllocatePrefetchLines, 3,                                  \
2988           "Number of lines to prefetch ahead of array allocation pointer")  \
2989                                                                             \
2990   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2991           "Number of lines to prefetch ahead of instance allocation "       \
2992           "pointer")                                                        \
2993                                                                             \
2994   product(intx,  AllocatePrefetchStepSize, 16,                              \
2995           "Step size in bytes of sequential prefetch instructions")         \
2996                                                                             \
2997   product(intx,  AllocatePrefetchInstr, 0,                                  \
2998           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2999                                                                             \
3000   /* deoptimization */                                                      \
3001   develop(bool, TraceDeoptimization, false,                                 \
3002           "Trace deoptimization")                                           \
3003                                                                             \
3004   develop(bool, DebugDeoptimization, false,                                 \
3005           "Tracing various information while debugging deoptimization")     \
3006                                                                             \
3007   product(intx, SelfDestructTimer, 0,                                       \
3008           "Will cause VM to terminate after a given time (in minutes) "     \
3009           "(0 means off)")                                                  \
3010                                                                             \
3011   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3012           "The maximum number of lines in the stack trace for Java "        \
3013           "exceptions (0 means all)")                                       \
3014                                                                             \
3015   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3016           "Guarantee a safepoint (at least) every so many milliseconds "    \
3017           "(0 means none)"))                                                \
3018                                                                             \
3019   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3020           "Guarantee a safepoint (at least) every so many milliseconds "    \
3021           "(0 means none)"))                                                \
3022                                                                             \
3023   product(intx, SafepointTimeoutDelay, 10000,                               \
3024           "Delay in milliseconds for option SafepointTimeout")              \
3025                                                                             \
3026   product(intx, NmethodSweepFraction, 16,                                   \
3027           "Number of invocations of sweeper to cover all nmethods")         \
3028                                                                             \
3029   product(intx, NmethodSweepCheckInterval, 5,                               \
3030           "Compilers wake up every n seconds to possibly sweep nmethods")   \
3031                                                                             \
3032   product(intx, NmethodSweepActivity, 10,                                   \
3033           "Removes cold nmethods from code cache if > 0. Higher values "    \
3034           "result in more aggressive sweeping")                             \
3035                                                                             \
3036   notproduct(bool, LogSweeper, false,                                       \
3037           "Keep a ring buffer of sweeper activity")                         \
3038                                                                             \
3039   notproduct(intx, SweeperLogEntries, 1024,                                 \
3040           "Number of records in the ring buffer of sweeper activity")       \
3041                                                                             \
3042   notproduct(intx, MemProfilingInterval, 500,                               \
3043           "Time between each invocation of the MemProfiler")                \
3044                                                                             \
3045   develop(intx, MallocCatchPtr, -1,                                         \
3046           "Hit breakpoint when mallocing/freeing this pointer")             \
3047                                                                             \
3048   notproduct(intx, AssertRepeat, 1,                                         \
3049           "number of times to evaluate expression in assert "               \
3050           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
3051                                                                             \
3052   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3053           "List of assertions (file:line) to muzzle")                       \
3054                                                                             \
3055   notproduct(uintx, HandleAllocationLimit, 1024,                            \
3056           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3057           "is used")                                                        \
3058                                                                             \
3059   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
3060           "Threshold for total handle allocation when "                     \
3061           "+TraceHandleAllocation is used")                                 \
3062                                                                             \
3063   develop(intx, StackPrintLimit, 100,                                       \
3064           "number of stack frames to print in VM-level stack dump")         \
3065                                                                             \
3066   notproduct(intx, MaxElementPrintSize, 256,                                \
3067           "maximum number of elements to print")                            \
3068                                                                             \
3069   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3070           "maximum number of subklasses to print when printing klass")      \
3071                                                                             \
3072   product(intx, MaxInlineLevel, 9,                                          \
3073           "maximum number of nested calls that are inlined")                \
3074                                                                             \
3075   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3076           "maximum number of nested recursive calls that are inlined")      \
3077                                                                             \
3078   develop(intx, MaxForceInlineLevel, 100,                                   \
3079           "maximum number of nested calls that are forced for inlining "    \
3080           "(using CompilerOracle or marked w/ @ForceInline)")               \
3081                                                                             \
3082   product_pd(intx, InlineSmallCode,                                         \
3083           "Only inline already compiled methods if their code size is "     \
3084           "less than this")                                                 \
3085                                                                             \
3086   product(intx, MaxInlineSize, 35,                                          \
3087           "The maximum bytecode size of a method to be inlined")            \
3088                                                                             \
3089   product_pd(intx, FreqInlineSize,                                          \
3090           "The maximum bytecode size of a frequent method to be inlined")   \
3091                                                                             \
3092   product(intx, MaxTrivialSize, 6,                                          \
3093           "The maximum bytecode size of a trivial method to be inlined")    \
3094                                                                             \
3095   product(intx, MinInliningThreshold, 250,                                  \
3096           "The minimum invocation count a method needs to have to be "      \
3097           "inlined")                                                        \
3098                                                                             \
3099   develop(intx, MethodHistogramCutoff, 100,                                 \
3100           "The cutoff value for method invocation histogram (+CountCalls)") \
3101                                                                             \
3102   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3103           "Number of interpreted methods to show in profile")               \
3104                                                                             \
3105   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3106           "Number of compiled methods to show in profile")                  \
3107                                                                             \
3108   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3109           "Number of stub methods to show in profile")                      \
3110                                                                             \
3111   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3112           "Number of runtime stub nodes to show in profile")                \
3113                                                                             \
3114   product(intx, ProfileIntervalsTicks, 100,                                 \
3115           "Number of ticks between printing of interval profile "           \
3116           "(+ProfileIntervals)")                                            \
3117                                                                             \
3118   notproduct(intx, ScavengeALotInterval,     1,                             \
3119           "Interval between which scavenge will occur with +ScavengeALot")  \
3120                                                                             \
3121   notproduct(intx, FullGCALotInterval,     1,                               \
3122           "Interval between which full gc will occur with +FullGCALot")     \
3123                                                                             \
3124   notproduct(intx, FullGCALotStart,     0,                                  \
3125           "For which invocation to start FullGCAlot")                       \
3126                                                                             \
3127   notproduct(intx, FullGCALotDummies,  32*K,                                \
3128           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3129           "to move")                                                        \
3130                                                                             \
3131   develop(intx, DontYieldALotInterval,    10,                               \
3132           "Interval between which yields will be dropped (milliseconds)")   \
3133                                                                             \
3134   develop(intx, MinSleepInterval,     1,                                    \
3135           "Minimum sleep() interval (milliseconds) when "                   \
3136           "ConvertSleepToYield is off (used for Solaris)")                  \
3137                                                                             \
3138   develop(intx, ProfilerPCTickThreshold,    15,                             \
3139           "Number of ticks in a PC buckets to be a hotspot")                \
3140                                                                             \
3141   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3142           "Number of exits until DeoptimizeALot kicks in")                  \
3143                                                                             \
3144   notproduct(intx, ZombieALotInterval,     5,                               \
3145           "Number of exits until ZombieALot kicks in")                      \
3146                                                                             \
3147   diagnostic(intx, MallocVerifyInterval,     0,                             \
3148           "If non-zero, verify C heap after every N calls to "              \
3149           "malloc/realloc/free")                                            \
3150                                                                             \
3151   diagnostic(intx, MallocVerifyStart,     0,                                \
3152           "If non-zero, start verifying C heap after Nth call to "          \
3153           "malloc/realloc/free")                                            \
3154                                                                             \
3155   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3156           "If non-zero, maximum number of words that malloc/realloc can "   \
3157           "allocate (for testing only)")                                    \
3158                                                                             \
3159   product(intx, TypeProfileWidth,     2,                                    \
3160           "Number of receiver types to record in call/cast profile")        \
3161                                                                             \
3162   develop(intx, BciProfileWidth,      2,                                    \
3163           "Number of return bci's to record in ret profile")                \
3164                                                                             \
3165   product(intx, PerMethodRecompilationCutoff, 400,                          \
3166           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3167                                                                             \
3168   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3169           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3170                                                                             \
3171   product(intx, PerMethodTrapLimit,  100,                                   \
3172           "Limit on traps (of one kind) in a method (includes inlines)")    \
3173                                                                             \
3174   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3175           "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3176                                                                             \
3177   product(intx, PerBytecodeTrapLimit,  4,                                   \
3178           "Limit on traps (of one kind) at a particular BCI")               \
3179                                                                             \
3180   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3181           "Extra method data trap entries for speculation")                 \
3182                                                                             \
3183   develop(intx, InlineFrequencyRatio,    20,                                \
3184           "Ratio of call site execution to caller method invocation")       \
3185                                                                             \
3186   develop_pd(intx, InlineFrequencyCount,                                    \
3187           "Count of call site execution necessary to trigger frequent "     \
3188           "inlining")                                                       \
3189                                                                             \
3190   develop(intx, InlineThrowCount,    50,                                    \
3191           "Force inlining of interpreted methods that throw this often")    \
3192                                                                             \
3193   develop(intx, InlineThrowMaxSize,   200,                                  \
3194           "Force inlining of throwing methods smaller than this")           \
3195                                                                             \
3196   develop(intx, ProfilerNodeSize,  1024,                                    \
3197           "Size in K to allocate for the Profile Nodes of each thread")     \
3198                                                                             \
3199   product_pd(intx, PreInflateSpin,                                          \
3200           "Number of times to spin wait before inflation")                  \
3201                                                                             \
3202   /* gc parameters */                                                       \
3203   product(uintx, InitialHeapSize, 0,                                        \
3204           "Initial heap size (in bytes); zero means use ergonomics")        \
3205                                                                             \
3206   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3207           "Maximum heap size (in bytes)")                                   \
3208                                                                             \
3209   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3210           "Initial tenured generation size (in bytes)")                     \
3211                                                                             \
3212   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3213           "Initial new generation size (in bytes)")                         \
3214                                                                             \
3215   product(uintx, MaxNewSize, max_uintx,                                     \
3216           "Maximum new generation size (in bytes), max_uintx means set "    \
3217           "ergonomically")                                                  \
3218                                                                             \
3219   product(uintx, PretenureSizeThreshold, 0,                                 \
3220           "Maximum size in bytes of objects allocated in DefNew "           \
3221           "generation; zero means no maximum")                              \
3222                                                                             \
3223   product(uintx, TLABSize, 0,                                               \
3224           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3225                                                                             \
3226   product(uintx, MinTLABSize, 2*K,                                          \
3227           "Minimum allowed TLAB size (in bytes)")                           \
3228                                                                             \
3229   product(uintx, TLABAllocationWeight, 35,                                  \
3230           "Allocation averaging weight")                                    \
3231                                                                             \
3232   product(uintx, TLABWasteTargetPercent, 1,                                 \
3233           "Percentage of Eden that can be wasted")                          \
3234                                                                             \
3235   product(uintx, TLABRefillWasteFraction,    64,                            \
3236           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3237                                                                             \
3238   product(uintx, TLABWasteIncrement,    4,                                  \
3239           "Increment allowed waste at slow allocation")                     \
3240                                                                             \
3241   product(uintx, SurvivorRatio, 8,                                          \
3242           "Ratio of eden/survivor space size")                              \
3243                                                                             \
3244   product(uintx, NewRatio, 2,                                               \
3245           "Ratio of old/new generation sizes")                              \
3246                                                                             \
3247   product_pd(uintx, NewSizeThreadIncrease,                                  \
3248           "Additional size added to desired new generation size per "       \
3249           "non-daemon thread (in bytes)")                                   \
3250                                                                             \
3251   product_pd(uintx, MetaspaceSize,                                          \
3252           "Initial size of Metaspaces (in bytes)")                          \
3253                                                                             \
3254   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3255           "Maximum size of Metaspaces (in bytes)")                          \
3256                                                                             \
3257   product(uintx, CompressedClassSpaceSize, 1*G,                             \
3258           "Maximum size of class area in Metaspace when compressed "        \
3259           "class pointers are used")                                        \
3260                                                                             \
3261   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3262           "The minimum percentage of heap free after GC to avoid expansion."\
3263           " For most GCs this applies to the old generation. In G1 and"     \
3264           " ParallelGC it applies to the whole heap.")                      \
3265                                                                             \
3266   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3267           "The maximum percentage of heap free after GC to avoid shrinking."\
3268           " For most GCs this applies to the old generation. In G1 and"     \
3269           " ParallelGC it applies to the whole heap.")                      \
3270                                                                             \
3271   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3272           "Number of milliseconds per MB of free space in the heap")        \
3273                                                                             \
3274   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3275           "The minimum change in heap space due to GC (in bytes)")          \
3276                                                                             \
3277   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3278           "The minimum expansion of Metaspace (in bytes)")                  \
3279                                                                             \
3280   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3281           "The minimum percentage of Metaspace free after GC to avoid "     \
3282           "expansion")                                                      \
3283                                                                             \
3284   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3285           "The maximum percentage of Metaspace free after GC to avoid "     \
3286           "shrinking")                                                      \
3287                                                                             \
3288   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3289           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3290                                                                             \
3291   product(uintx, QueuedAllocationWarningCount, 0,                           \
3292           "Number of times an allocation that queues behind a GC "          \
3293           "will retry before printing a warning")                           \
3294                                                                             \
3295   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3296           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3297                                                                             \
3298   diagnostic(intx, VerifyGCLevel,     0,                                    \
3299           "Generation level at which to start +VerifyBefore/AfterGC")       \
3300                                                                             \
3301   product(uintx, MaxTenuringThreshold,    15,                               \
3302           "Maximum value for tenuring threshold")                           \
3303                                                                             \
3304   product(uintx, InitialTenuringThreshold,    7,                            \
3305           "Initial value for tenuring threshold")                           \
3306                                                                             \
3307   product(uintx, TargetSurvivorRatio,    50,                                \
3308           "Desired percentage of survivor space used after scavenge")       \
3309                                                                             \
3310   product(uintx, MarkSweepDeadRatio,     5,                                 \
3311           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3312           "Serial mark sweep treats this as both the minimum and maximum "  \
3313           "value. "                                                         \
3314           "CMS uses this value only if it falls back to mark sweep. "       \
3315           "Par compact uses a variable scale based on the density of the "  \
3316           "generation and treats this as the maximum value when the heap "  \
3317           "is either completely full or completely empty.  Par compact "    \
3318           "also has a smaller default value; see arguments.cpp.")           \
3319                                                                             \
3320   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3321           "How often should we fully compact the heap (ignoring the dead "  \
3322           "space parameters)")                                              \
3323                                                                             \
3324   product(intx, PrintCMSStatistics, 0,                                      \
3325           "Statistics for CMS")                                             \
3326                                                                             \
3327   product(bool, PrintCMSInitiationStatistics, false,                        \
3328           "Statistics for initiating a CMS collection")                     \
3329                                                                             \
3330   product(intx, PrintFLSStatistics, 0,                                      \
3331           "Statistics for CMS' FreeListSpace")                              \
3332                                                                             \
3333   product(intx, PrintFLSCensus, 0,                                          \
3334           "Census for CMS' FreeListSpace")                                  \
3335                                                                             \
3336   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3337           "Delay between expansion and allocation (in milliseconds)")       \
3338                                                                             \
3339   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3340           "Delay in scheduling GC workers (in milliseconds)")               \
3341                                                                             \
3342   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3343           "(Unstable) Number of times to iterate in safepoint loop "        \
3344           "before blocking VM threads ")                                    \
3345                                                                             \
3346   product(intx, DeferPollingPageLoopCount,     -1,                          \
3347           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3348           "before changing safepoint polling page to RO ")                  \
3349                                                                             \
3350   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3351                                                                             \
3352   product(bool, PSChunkLargeArrays, true,                                   \
3353           "Process large arrays in chunks")                                 \
3354                                                                             \
3355   product(uintx, GCDrainStackTargetSize, 64,                                \
3356           "Number of entries we will try to leave on the stack "            \
3357           "during parallel gc")                                             \
3358                                                                             \
3359   /* stack parameters */                                                    \
3360   product_pd(intx, StackYellowPages,                                        \
3361           "Number of yellow zone (recoverable overflows) pages")            \
3362                                                                             \
3363   product_pd(intx, StackRedPages,                                           \
3364           "Number of red zone (unrecoverable overflows) pages")             \
3365                                                                             \
3366   product_pd(intx, StackShadowPages,                                        \
3367           "Number of shadow zone (for overflow checking) pages "            \
3368           "this should exceed the depth of the VM and native call stack")   \
3369                                                                             \
3370   product_pd(intx, ThreadStackSize,                                         \
3371           "Thread Stack Size (in Kbytes)")                                  \
3372                                                                             \
3373   product_pd(intx, VMThreadStackSize,                                       \
3374           "Non-Java Thread Stack Size (in Kbytes)")                         \
3375                                                                             \
3376   product_pd(intx, CompilerThreadStackSize,                                 \
3377           "Compiler Thread Stack Size (in Kbytes)")                         \
3378                                                                             \
3379   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3380           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3381                                                                             \
3382   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3383           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3384           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3385           "disable this feature")                                           \
3386                                                                             \
3387   /* code cache parameters */                                               \
3388   /* ppc64 has large code-entry alignment. */                               \
3389   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64),                  \
3390           "Code cache segment size (in bytes) - smallest unit of "          \
3391           "allocation")                                                     \
3392                                                                             \
3393   develop_pd(intx, CodeEntryAlignment,                                      \
3394           "Code entry alignment for generated code (in bytes)")             \
3395                                                                             \
3396   product_pd(intx, OptoLoopAlignment,                                       \
3397           "Align inner loops to zero relative to this modulus")             \
3398                                                                             \
3399   product_pd(uintx, InitialCodeCacheSize,                                   \
3400           "Initial code cache size (in bytes)")                             \
3401                                                                             \
3402   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3403           "Minimum code cache size (in bytes) required to start VM.")       \
3404                                                                             \
3405   product_pd(uintx, ReservedCodeCacheSize,                                  \
3406           "Reserved code cache size (in bytes) - maximum code cache size")  \
3407                                                                             \
3408   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3409           "When less than X space left, we stop compiling")                 \
3410                                                                             \
3411   product_pd(uintx, CodeCacheExpansionSize,                                 \
3412           "Code cache expansion size (in bytes)")                           \
3413                                                                             \
3414   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3415           "Minimum number of segments in a code cache block")               \
3416                                                                             \
3417   notproduct(bool, ExitOnFullCodeCache, false,                              \
3418           "Exit the VM if we fill the code cache")                          \
3419                                                                             \
3420   product(bool, UseCodeCacheFlushing, true,                                 \
3421           "Remove cold/old nmethods from the code cache")                   \
3422                                                                             \
3423   /* interpreter debugging */                                               \
3424   develop(intx, BinarySwitchThreshold, 5,                                   \
3425           "Minimal number of lookupswitch entries for rewriting to binary " \
3426           "switch")                                                         \
3427                                                                             \
3428   develop(intx, StopInterpreterAt, 0,                                       \
3429           "Stop interpreter execution at specified bytecode number")        \
3430                                                                             \
3431   develop(intx, TraceBytecodesAt, 0,                                        \
3432           "Trace bytecodes starting with specified bytecode number")        \
3433                                                                             \
3434   /* compiler interface */                                                  \
3435   develop(intx, CIStart, 0,                                                 \
3436           "The id of the first compilation to permit")                      \
3437                                                                             \
3438   develop(intx, CIStop, max_jint,                                           \
3439           "The id of the last compilation to permit")                       \
3440                                                                             \
3441   develop(intx, CIStartOSR, 0,                                              \
3442           "The id of the first osr compilation to permit "                  \
3443           "(CICountOSR must be on)")                                        \
3444                                                                             \
3445   develop(intx, CIStopOSR, max_jint,                                        \
3446           "The id of the last osr compilation to permit "                   \
3447           "(CICountOSR must be on)")                                        \
3448                                                                             \
3449   develop(intx, CIBreakAtOSR, -1,                                           \
3450           "The id of osr compilation to break at")                          \
3451                                                                             \
3452   develop(intx, CIBreakAt, -1,                                              \
3453           "The id of compilation to break at")                              \
3454                                                                             \
3455   product(ccstrlist, CompileOnly, "",                                       \
3456           "List of methods (pkg/class.name) to restrict compilation to")    \
3457                                                                             \
3458   product(ccstr, CompileCommandFile, NULL,                                  \
3459           "Read compiler commands from this file [.hotspot_compiler]")      \
3460                                                                             \
3461   product(ccstrlist, CompileCommand, "",                                    \
3462           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3463                                                                             \
3464   develop(bool, ReplayCompiles, false,                                      \
3465           "Enable replay of compilations from ReplayDataFile")              \
3466                                                                             \
3467   product(ccstr, ReplayDataFile, NULL,                                      \
3468           "File containing compilation replay information"                  \
3469           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3470                                                                             \
3471    product(ccstr, InlineDataFile, NULL,                                     \
3472           "File containing inlining replay information"                     \
3473           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3474                                                                             \
3475   develop(intx, ReplaySuppressInitializers, 2,                              \
3476           "Control handling of class initialization during replay: "        \
3477           "0 - don't do anything special; "                                 \
3478           "1 - treat all class initializers as empty; "                     \
3479           "2 - treat class initializers for application classes as empty; " \
3480           "3 - allow all class initializers to run during bootstrap but "   \
3481           "    pretend they are empty after starting replay")               \
3482                                                                             \
3483   develop(bool, ReplayIgnoreInitErrors, false,                              \
3484           "Ignore exceptions thrown during initialization for replay")      \
3485                                                                             \
3486   product(bool, DumpReplayDataOnError, true,                                \
3487           "Record replay data for crashing compiler threads")               \
3488                                                                             \
3489   product(bool, CICompilerCountPerCPU, false,                               \
3490           "1 compiler thread for log(N CPUs)")                              \
3491                                                                             \
3492   develop(intx, CIFireOOMAt,    -1,                                         \
3493           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3494           "(non-negative value throws OOM after this many CI accesses "     \
3495           "in each compile)")                                               \
3496   notproduct(intx, CICrashAt, -1,                                           \
3497           "id of compilation to trigger assert in compiler thread for "     \
3498           "the purpose of testing, e.g. generation of replay data")         \
3499   notproduct(bool, CIObjectFactoryVerify, false,                            \
3500           "enable potentially expensive verification in ciObjectFactory")   \
3501                                                                             \
3502   /* Priorities */                                                          \
3503   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3504                                                                             \
3505   product(intx, ThreadPriorityPolicy, 0,                                    \
3506           "0 : Normal.                                                     "\
3507           "    VM chooses priorities that are appropriate for normal       "\
3508           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3509           "    to normal native priority. Java priorities below "           \
3510           "    NORM_PRIORITY map to lower native priority values. On       "\
3511           "    Windows applications are allowed to use higher native       "\
3512           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3513           "    not use the highest possible native priority,               "\
3514           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3515           "    system threads. On Linux thread priorities are ignored      "\
3516           "    because the OS does not support static priority in          "\
3517           "    SCHED_OTHER scheduling class which is the only choice for   "\
3518           "    non-root, non-realtime applications.                        "\
3519           "1 : Aggressive.                                                 "\
3520           "    Java thread priorities map over to the entire range of      "\
3521           "    native thread priorities. Higher Java thread priorities map "\
3522           "    to higher native thread priorities. This policy should be   "\
3523           "    used with care, as sometimes it can cause performance       "\
3524           "    degradation in the application and/or the entire system. On "\
3525           "    Linux this policy requires root privilege.")                 \
3526                                                                             \
3527   product(bool, ThreadPriorityVerbose, false,                               \
3528           "Print priority changes")                                         \
3529                                                                             \
3530   product(intx, DefaultThreadPriority, -1,                                  \
3531           "The native priority at which threads run if not elsewhere "      \
3532           "specified (-1 means no change)")                                 \
3533                                                                             \
3534   product(intx, CompilerThreadPriority, -1,                                 \
3535           "The native priority at which compiler threads should run "       \
3536           "(-1 means no change)")                                           \
3537                                                                             \
3538   product(intx, VMThreadPriority, -1,                                       \
3539           "The native priority at which the VM thread should run "          \
3540           "(-1 means no change)")                                           \
3541                                                                             \
3542   product(bool, CompilerThreadHintNoPreempt, true,                          \
3543           "(Solaris only) Give compiler threads an extra quanta")           \
3544                                                                             \
3545   product(bool, VMThreadHintNoPreempt, false,                               \
3546           "(Solaris only) Give VM thread an extra quanta")                  \
3547                                                                             \
3548   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3549           "Map Java priorities to OS priorities")                           \
3550                                                                             \
3551   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3552           "Map Java priorities to OS priorities")                           \
3553                                                                             \
3554   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3555           "Map Java priorities to OS priorities")                           \
3556                                                                             \
3557   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3558           "Map Java priorities to OS priorities")                           \
3559                                                                             \
3560   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3561           "Map Java priorities to OS priorities")                           \
3562                                                                             \
3563   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3564           "Map Java priorities to OS priorities")                           \
3565                                                                             \
3566   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3567           "Map Java priorities to OS priorities")                           \
3568                                                                             \
3569   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3570           "Map Java priorities to OS priorities")                           \
3571                                                                             \
3572   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3573           "Map Java priorities to OS priorities")                           \
3574                                                                             \
3575   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3576           "Map Java priorities to OS priorities")                           \
3577                                                                             \
3578   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3579           "Java thread priority 10 maps to critical scheduling priority")   \
3580                                                                             \
3581   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3582           "Compiler thread(s) run at critical scheduling priority")         \
3583                                                                             \
3584   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3585           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3586                                                                             \
3587   /* compiler debugging */                                                  \
3588   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3589           "First class to consider when using +CompileTheWorld")            \
3590                                                                             \
3591   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3592           "Last class to consider when using +CompileTheWorld")             \
3593                                                                             \
3594   develop(intx, NewCodeParameter,      0,                                   \
3595           "Testing Only: Create a dedicated integer parameter before "      \
3596           "putback")                                                        \
3597                                                                             \
3598   /* new oopmap storage allocation */                                       \
3599   develop(intx, MinOopMapAllocation,     8,                                 \
3600           "Minimum number of OopMap entries in an OopMapSet")               \
3601                                                                             \
3602   /* Background Compilation */                                              \
3603   develop(intx, LongCompileThreshold,     50,                               \
3604           "Used with +TraceLongCompiles")                                   \
3605                                                                             \
3606   product(intx, StarvationMonitorInterval,    200,                          \
3607           "Pause between each check (in milliseconds)")                     \
3608                                                                             \
3609   /* recompilation */                                                       \
3610   product_pd(intx, CompileThreshold,                                        \
3611           "number of interpreted method invocations before (re-)compiling") \
3612                                                                             \
3613   product_pd(intx, BackEdgeThreshold,                                       \
3614           "Interpreter Back edge threshold at which an OSR compilation is " \
3615           "invoked")                                                        \
3616                                                                             \
3617   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3618           "Interpreter (tier 0) invocation notification frequency")         \
3619                                                                             \
3620   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3621           "C1 without MDO (tier 2) invocation notification frequency")      \
3622                                                                             \
3623   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3624           "C1 with MDO profiling (tier 3) invocation notification "         \
3625           "frequency")                                                      \
3626                                                                             \
3627   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3628           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3629                                                                             \
3630   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3631           "Interpreter (tier 0) invocation notification frequency")         \
3632                                                                             \
3633   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3634           "C1 without MDO (tier 2) invocation notification frequency")      \
3635                                                                             \
3636   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3637           "C1 with MDO profiling (tier 3) invocation notification "         \
3638           "frequency")                                                      \
3639                                                                             \
3640   product(intx, Tier2CompileThreshold, 0,                                   \
3641           "threshold at which tier 2 compilation is invoked")               \
3642                                                                             \
3643   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3644           "Back edge threshold at which tier 2 compilation is invoked")     \
3645                                                                             \
3646   product(intx, Tier3InvocationThreshold, 200,                              \
3647           "Compile if number of method invocations crosses this "           \
3648           "threshold")                                                      \
3649                                                                             \
3650   product(intx, Tier3MinInvocationThreshold, 100,                           \
3651           "Minimum invocation to compile at tier 3")                        \
3652                                                                             \
3653   product(intx, Tier3CompileThreshold, 2000,                                \
3654           "Threshold at which tier 3 compilation is invoked (invocation "   \
3655           "minimum must be satisfied")                                      \
3656                                                                             \
3657   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3658           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3659                                                                             \
3660   product(intx, Tier4InvocationThreshold, 5000,                             \
3661           "Compile if number of method invocations crosses this "           \
3662           "threshold")                                                      \
3663                                                                             \
3664   product(intx, Tier4MinInvocationThreshold, 600,                           \
3665           "Minimum invocation to compile at tier 4")                        \
3666                                                                             \
3667   product(intx, Tier4CompileThreshold, 15000,                               \
3668           "Threshold at which tier 4 compilation is invoked (invocation "   \
3669           "minimum must be satisfied")                                      \
3670                                                                             \
3671   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3672           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3673                                                                             \
3674   product(intx, Tier3DelayOn, 5,                                            \
3675           "If C2 queue size grows over this amount per compiler thread "    \
3676           "stop compiling at tier 3 and start compiling at tier 2")         \
3677                                                                             \
3678   product(intx, Tier3DelayOff, 2,                                           \
3679           "If C2 queue size is less than this amount per compiler thread "  \
3680           "allow methods compiled at tier 2 transition to tier 3")          \
3681                                                                             \
3682   product(intx, Tier3LoadFeedback, 5,                                       \
3683           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3684           "reaches this amount per compiler thread")                        \
3685                                                                             \
3686   product(intx, Tier4LoadFeedback, 3,                                       \
3687           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3688           "reaches this amount per compiler thread")                        \
3689                                                                             \
3690   product(intx, TieredCompileTaskTimeout, 50,                               \
3691           "Kill compile task if method was not used within "                \
3692           "given timeout in milliseconds")                                  \
3693                                                                             \
3694   product(intx, TieredStopAtLevel, 4,                                       \
3695           "Stop at given compilation level")                                \
3696                                                                             \
3697   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3698           "Start profiling in interpreter if the counters exceed tier 3 "   \
3699           "thresholds by the specified percentage")                         \
3700                                                                             \
3701   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3702           "Increase the compile threshold for C1 compilation if the code "  \
3703           "cache is filled by the specified percentage")                    \
3704                                                                             \
3705   product(intx, TieredRateUpdateMinTime, 1,                                 \
3706           "Minimum rate sampling interval (in milliseconds)")               \
3707                                                                             \
3708   product(intx, TieredRateUpdateMaxTime, 25,                                \
3709           "Maximum rate sampling interval (in milliseconds)")               \
3710                                                                             \
3711   product_pd(bool, TieredCompilation,                                       \
3712           "Enable tiered compilation")                                      \
3713                                                                             \
3714   product(bool, PrintTieredEvents, false,                                   \
3715           "Print tiered events notifications")                              \
3716                                                                             \
3717   product_pd(intx, OnStackReplacePercentage,                                \
3718           "NON_TIERED number of method invocations/branches (expressed as " \
3719           "% of CompileThreshold) before (re-)compiling OSR code")          \
3720                                                                             \
3721   product(intx, InterpreterProfilePercentage, 33,                           \
3722           "NON_TIERED number of method invocations/branches (expressed as " \
3723           "% of CompileThreshold) before profiling in the interpreter")     \
3724                                                                             \
3725   develop(intx, MaxRecompilationSearchLength,    10,                        \
3726           "The maximum number of frames to inspect when searching for "     \
3727           "recompilee")                                                     \
3728                                                                             \
3729   develop(intx, MaxInterpretedSearchLength,     3,                          \
3730           "The maximum number of interpreted frames to skip when searching "\
3731           "for recompilee")                                                 \
3732                                                                             \
3733   develop(intx, DesiredMethodLimit,  8000,                                  \
3734           "The desired maximum method size (in bytecodes) after inlining")  \
3735                                                                             \
3736   develop(intx, HugeMethodLimit,  8000,                                     \
3737           "Don't compile methods larger than this if "                      \
3738           "+DontCompileHugeMethods")                                        \
3739                                                                             \
3740   /* New JDK 1.4 reflection implementation */                               \
3741                                                                             \
3742   develop(bool, UseNewReflection, true,                                     \
3743           "Temporary flag for transition to reflection based on dynamic "   \
3744           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3745           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3746           "changes were needed")                                            \
3747                                                                             \
3748   develop(bool, VerifyReflectionBytecodes, false,                           \
3749           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3750           "in situations like that described in 4486457 or for "            \
3751           "constructors generated for serialization, so can not be enabled "\
3752           "in product.")                                                    \
3753                                                                             \
3754   product(bool, ReflectionWrapResolutionErrors, true,                       \
3755           "Temporary flag for transition to AbstractMethodError wrapped "   \
3756           "in InvocationTargetException. See 6531596")                      \
3757                                                                             \
3758   develop(intx, FastSuperclassLimit, 8,                                     \
3759           "Depth of hardwired instanceof accelerator array")                \
3760                                                                             \
3761   /* Properties for Java libraries  */                                      \
3762                                                                             \
3763   product(uintx, MaxDirectMemorySize, 0,                                    \
3764           "Maximum total size of NIO direct-buffer allocations")            \
3765                                                                             \
3766   /* temporary developer defined flags  */                                  \
3767                                                                             \
3768   diagnostic(bool, UseNewCode, false,                                       \
3769           "Testing Only: Use the new version while testing")                \
3770                                                                             \
3771   diagnostic(bool, UseNewCode2, false,                                      \
3772           "Testing Only: Use the new version while testing")                \
3773                                                                             \
3774   diagnostic(bool, UseNewCode3, false,                                      \
3775           "Testing Only: Use the new version while testing")                \
3776                                                                             \
3777   /* flags for performance data collection */                               \
3778                                                                             \
3779   product(bool, UsePerfData, falseInEmbedded,                               \
3780           "Flag to disable jvmstat instrumentation for performance testing "\
3781           "and problem isolation purposes")                                 \
3782                                                                             \
3783   product(bool, PerfDataSaveToFile, false,                                  \
3784           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3785                                                                             \
3786   product(ccstr, PerfDataSaveFile, NULL,                                    \
3787           "Save PerfData memory to the specified absolute pathname. "       \
3788           "The string %p in the file name (if present) "                    \
3789           "will be replaced by pid")                                        \
3790                                                                             \
3791   product(intx, PerfDataSamplingInterval, 50,                               \
3792           "Data sampling interval (in milliseconds)")                       \
3793                                                                             \
3794   develop(bool, PerfTraceDataCreation, false,                               \
3795           "Trace creation of Performance Data Entries")                     \
3796                                                                             \
3797   develop(bool, PerfTraceMemOps, false,                                     \
3798           "Trace PerfMemory create/attach/detach calls")                    \
3799                                                                             \
3800   product(bool, PerfDisableSharedMem, false,                                \
3801           "Store performance data in standard memory")                      \
3802                                                                             \
3803   product(intx, PerfDataMemorySize, 32*K,                                   \
3804           "Size of performance data memory region. Will be rounded "        \
3805           "up to a multiple of the native os page size.")                   \
3806                                                                             \
3807   product(intx, PerfMaxStringConstLength, 1024,                             \
3808           "Maximum PerfStringConstant string length before truncation")     \
3809                                                                             \
3810   product(bool, PerfAllowAtExitRegistration, false,                         \
3811           "Allow registration of atexit() methods")                         \
3812                                                                             \
3813   product(bool, PerfBypassFileSystemCheck, false,                           \
3814           "Bypass Win32 file system criteria checks (Windows Only)")        \
3815                                                                             \
3816   product(intx, UnguardOnExecutionViolation, 0,                             \
3817           "Unguard page and retry on no-execute fault (Win32 only) "        \
3818           "0=off, 1=conservative, 2=aggressive")                            \
3819                                                                             \
3820   /* Serviceability Support */                                              \
3821                                                                             \
3822   product(bool, ManagementServer, false,                                    \
3823           "Create JMX Management Server")                                   \
3824                                                                             \
3825   product(bool, DisableAttachMechanism, false,                              \
3826           "Disable mechanism that allows tools to attach to this VM")       \
3827                                                                             \
3828   product(bool, StartAttachListener, false,                                 \
3829           "Always start Attach Listener at VM startup")                     \
3830                                                                             \
3831   manageable(bool, PrintConcurrentLocks, false,                             \
3832           "Print java.util.concurrent locks in thread dump")                \
3833                                                                             \
3834   product(bool, TransmitErrorReport, false,                                 \
3835           "Enable error report transmission on erroneous termination")      \
3836                                                                             \
3837   product(ccstr, ErrorReportServer, NULL,                                   \
3838           "Override built-in error report server address")                  \
3839                                                                             \
3840   /* Shared spaces */                                                       \
3841                                                                             \
3842   product(bool, UseSharedSpaces, true,                                      \
3843           "Use shared spaces for metadata")                                 \
3844                                                                             \
3845   product(bool, VerifySharedSpaces, false,                                  \
3846           "Verify shared spaces (false for default archive, true for "      \
3847           "archive specified by -XX:SharedArchiveFile)")                    \
3848                                                                             \
3849   product(bool, RequireSharedSpaces, false,                                 \
3850           "Require shared spaces for metadata")                             \
3851                                                                             \
3852   product(bool, DumpSharedSpaces, false,                                    \
3853           "Special mode: JVM reads a class list, loads classes, builds "    \
3854           "shared spaces, and dumps the shared spaces to a file to be "     \
3855           "used in future JVM runs")                                        \
3856                                                                             \
3857   product(bool, PrintSharedSpaces, false,                                   \
3858           "Print usage of shared spaces")                                   \
3859                                                                             \
3860   product(bool, PrintSharedArchiveAndExit, false,                           \
3861           "Print shared archive file contents")                             \
3862                                                                             \
3863   product(bool, PrintSharedDictionary, false,                               \
3864           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3865           "dictionary")                                                     \
3866                                                                             \
3867   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3868           "Size of read-write space for metadata (in bytes)")               \
3869                                                                             \
3870   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3871           "Size of read-only space for metadata (in bytes)")                \
3872                                                                             \
3873   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3874           "Size of the shared miscellaneous data area (in bytes)")          \
3875                                                                             \
3876   product(uintx, SharedMiscCodeSize,    AARCH64_ONLY(192*K) NOT_AARCH64(120*K), \
3877           "Size of the shared miscellaneous code area (in bytes)")          \
3878                                                                             \
3879   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3880           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3881           "Address to allocate shared memory region for class data")        \
3882                                                                             \
3883   diagnostic(bool, EnableInvokeDynamic, true,                               \
3884           "support JSR 292 (method handles, invokedynamic, "                \
3885           "anonymous classes")                                              \
3886                                                                             \
3887   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3888           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3889           "classes. Just exclude them from the shared dictionary.")         \
3890                                                                             \
3891   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3892           "Print generated stub code for method handles")                   \
3893                                                                             \
3894   develop(bool, TraceMethodHandles, false,                                  \
3895           "trace internal method handle operations")                        \
3896                                                                             \
3897   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3898           "perform extra checks when constructing method handles")          \
3899                                                                             \
3900   diagnostic(bool, ShowHiddenFrames, false,                                 \
3901           "show method handle implementation frames (usually hidden)")      \
3902                                                                             \
3903   experimental(bool, TrustFinalNonStaticFields, false,                      \
3904           "trust final non-static declarations for constant folding")       \
3905                                                                             \
3906   diagnostic(bool, FoldStableValues, true,                                  \
3907           "Optimize loads from stable fields (marked w/ @Stable)")          \
3908                                                                             \
3909   develop(bool, TraceInvokeDynamic, false,                                  \
3910           "trace internal invoke dynamic operations")                       \
3911                                                                             \
3912   diagnostic(bool, PauseAtStartup,      false,                              \
3913           "Causes the VM to pause at startup time and wait for the pause "  \
3914           "file to be removed (default: ./vm.paused.<pid>)")                \
3915                                                                             \
3916   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3917           "The file to create and for whose removal to await when pausing " \
3918           "at startup. (default: ./vm.paused.<pid>)")                       \
3919                                                                             \
3920   diagnostic(bool, PauseAtExit, false,                                      \
3921           "Pause and wait for keypress on exit if a debugger is attached")  \
3922                                                                             \
3923   product(bool, ExtendedDTraceProbes,    false,                             \
3924           "Enable performance-impacting dtrace probes")                     \
3925                                                                             \
3926   product(bool, DTraceMethodProbes, false,                                  \
3927           "Enable dtrace probes for method-entry and method-exit")          \
3928                                                                             \
3929   product(bool, DTraceAllocProbes, false,                                   \
3930           "Enable dtrace probes for object allocation")                     \
3931                                                                             \
3932   product(bool, DTraceMonitorProbes, false,                                 \
3933           "Enable dtrace probes for monitor events")                        \
3934                                                                             \
3935   product(bool, RelaxAccessControlCheck, false,                             \
3936           "Relax the access control checks in the verifier")                \
3937                                                                             \
3938   diagnostic(bool, PrintDTraceDOF, false,                                   \
3939           "Print the DTrace DOF passed to the system for JSDT probes")      \
3940                                                                             \
3941   product(uintx, StringTableSize, defaultStringTableSize,                   \
3942           "Number of buckets in the interned String table")                 \
3943                                                                             \
3944   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3945           "Number of buckets in the JVM internal Symbol table")             \
3946                                                                             \
3947   product(bool, UseStringDeduplication, false,                              \
3948           "Use string deduplication")                                       \
3949                                                                             \
3950   product(bool, PrintStringDeduplicationStatistics, false,                  \
3951           "Print string deduplication statistics")                          \
3952                                                                             \
3953   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3954           "A string must reach this age (or be promoted to an old region) " \
3955           "to be considered for deduplication")                             \
3956                                                                             \
3957   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3958           "Force table resize every time the table is scanned")             \
3959                                                                             \
3960   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3961           "Force table rehash every time the table is scanned")             \
3962                                                                             \
3963   develop(bool, TraceDefaultMethods, false,                                 \
3964           "Trace the default method processing steps")                      \
3965                                                                             \
3966   develop(bool, VerifyGenericSignatures, false,                             \
3967           "Abort VM on erroneous or inconsistent generic signatures")       \
3968                                                                             \
3969   product(bool, UseVMInterruptibleIO, false,                                \
3970           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3971           "EINTR for I/O operations results in OS_INTRPT. The default "     \
3972           "value of this flag is true for JDK 6 and earlier")               \
3973                                                                             \
3974   diagnostic(bool, WhiteBoxAPI, false,                                      \
3975           "Enable internal testing APIs")                                   \
3976                                                                             \
3977   product(bool, PrintGCCause, true,                                         \
3978           "Include GC cause in GC logging")                                 \
3979                                                                             \
3980   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3981            "Default survivor space alignment in bytes")                     \
3982                                                                             \
3983   product(bool , AllowNonVirtualCalls, false,                               \
3984           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3985                                                                             \
3986   product(ccstr, DumpLoadedClassList, NULL,                                 \
3987           "Dump the names all loaded classes, that could be stored into "   \
3988           "the CDS archive, in the specified file")                         \
3989                                                                             \
3990   product(ccstr, SharedClassListFile, NULL,                                 \
3991           "Override the default CDS class list")                            \
3992                                                                             \
3993   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3994           "Override the default location of the CDS archive file")          \
3995                                                                             \
3996   product(ccstr, ExtraSharedClassListFile, NULL,                            \
3997           "Extra classlist for building the CDS archive file")              \
3998                                                                             \
3999   experimental(uintx, ArrayAllocatorMallocLimit,                            \
4000           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
4001           "Allocation less than this value will be allocated "              \
4002           "using malloc. Larger allocations will use mmap.")                \
4003                                                                             \
4004   product_pd(bool, PreserveFramePointer,                                    \
4005              "Use the FP register for holding the frame pointer "           \
4006              "and not as a general purpose register.")                      \
4007                                                                             \
4008   product(bool, EnableTracing, false,                                       \
4009           "Enable event-based tracing"                                      \
4010           "Deprecated: use FlightRecorder instead")                         \
4011                                                                             \
4012   product(bool, UseLockedTracing, false,                                    \
4013           "Use locked-tracing when doing event-based tracing"               \
4014           "Deprecated: use FlightRecorder instead")                         \
4015                                                                             \
4016   JFR_ONLY(product(bool, FlightRecorder, false,                             \
4017           "Enable Flight Recorder"))                                        \
4018                                                                             \
4019   JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL,                      \
4020           "Flight Recorder options"))                                       \
4021                                                                             \
4022   JFR_ONLY(product(ccstr, StartFlightRecording, NULL,                       \
4023           "Start flight recording with options"))                           \
4024                                                                             \
4025   JFR_ONLY(product(bool, UnlockCommercialFeatures, false,                   \
4026           "This flag is ignored. Left for compatibility"))                  \
4027                                                                             \
4028   experimental(bool, UseFastUnorderedTimeStamps, false,                     \
4029           "Use platform unstable time where supported for timestamps only") \
4030                                                                             \
4031   JFR_ONLY(product(bool, LogJFR, false,                                     \
4032           "Enable JFR logging (consider +Verbose)"))                        \
4033 
4034 /*
4035  *  Macros for factoring of globals
4036  */
4037 
4038 // Interface macros
4039 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4040 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4041 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4042 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4043 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4044 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4045 #ifdef PRODUCT
4046 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4047 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4048 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4049 #else
4050 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4051 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4052 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4053 #endif
4054 // Special LP64 flags, product only needed for now.
4055 #ifdef _LP64
4056 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4057 #else
4058 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4059 #endif // _LP64
4060 
4061 // Implementation macros
4062 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4063 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4064 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4065 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4066 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4067 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4068 #ifdef PRODUCT
4069 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4070 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4071 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4072 #else
4073 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4074 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4075 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4076 #endif
4077 #ifdef _LP64
4078 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4079 #else
4080 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4081 #endif // _LP64
4082 
4083 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG)
4084 
4085 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
4086 
4087 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
4088 
4089 // Extensions
4090 
4091 #include "runtime/globals_ext.hpp"
4092 
4093 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---