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