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_aarch64
  44 # include "globals_aarch64.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_sparc
  47 # include "globals_sparc.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_zero
  50 # include "globals_zero.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_arm
  53 # include "globals_arm.hpp"
  54 #endif
  55 #ifdef TARGET_ARCH_ppc
  56 # include "globals_ppc.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_linux
  59 # include "globals_linux.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_solaris
  62 # include "globals_solaris.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_windows
  65 # include "globals_windows.hpp"
  66 #endif
  67 #ifdef TARGET_OS_FAMILY_aix
  68 # include "globals_aix.hpp"
  69 #endif
  70 #ifdef TARGET_OS_FAMILY_bsd
  71 # include "globals_bsd.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_x86
  74 # include "globals_linux_x86.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_linux_aarch64
  77 # include "globals_linux_aarch64.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_linux_sparc
  80 # include "globals_linux_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_linux_zero
  83 # include "globals_linux_zero.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_solaris_x86
  86 # include "globals_solaris_x86.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_solaris_sparc
  89 # include "globals_solaris_sparc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_windows_x86
  92 # include "globals_windows_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_linux_arm
  95 # include "globals_linux_arm.hpp"
  96 #endif
  97 #ifdef TARGET_OS_ARCH_linux_ppc
  98 # include "globals_linux_ppc.hpp"
  99 #endif
 100 #ifdef TARGET_OS_ARCH_aix_ppc
 101 # include "globals_aix_ppc.hpp"
 102 #endif
 103 #ifdef TARGET_OS_ARCH_bsd_x86
 104 # include "globals_bsd_x86.hpp"
 105 #endif
 106 #ifdef TARGET_OS_ARCH_bsd_zero
 107 # include "globals_bsd_zero.hpp"
 108 #endif
 109 #ifdef COMPILER1
 110 #ifdef TARGET_ARCH_x86
 111 # include "c1_globals_x86.hpp"
 112 #endif
 113 #ifdef TARGET_ARCH_aarch64
 114 # include "c1_globals_aarch64.hpp"
 115 #endif
 116 #ifdef TARGET_ARCH_sparc
 117 # include "c1_globals_sparc.hpp"
 118 #endif
 119 #ifdef TARGET_ARCH_arm
 120 # include "c1_globals_arm.hpp"
 121 #endif
 122 #ifdef TARGET_ARCH_ppc
 123 # include "c1_globals_ppc.hpp"
 124 #endif
 125 #ifdef TARGET_OS_FAMILY_linux
 126 # include "c1_globals_linux.hpp"
 127 #endif
 128 #ifdef TARGET_OS_FAMILY_solaris
 129 # include "c1_globals_solaris.hpp"
 130 #endif
 131 #ifdef TARGET_OS_FAMILY_windows
 132 # include "c1_globals_windows.hpp"
 133 #endif
 134 #ifdef TARGET_OS_FAMILY_aix
 135 # include "c1_globals_aix.hpp"
 136 #endif
 137 #ifdef TARGET_OS_FAMILY_bsd
 138 # include "c1_globals_bsd.hpp"
 139 #endif
 140 #endif
 141 #ifdef COMPILER2
 142 #ifdef TARGET_ARCH_x86
 143 # include "c2_globals_x86.hpp"
 144 #endif
 145 #ifdef TARGET_ARCH_aarch64
 146 # include "c2_globals_aarch64.hpp"
 147 #endif
 148 #ifdef TARGET_ARCH_sparc
 149 # include "c2_globals_sparc.hpp"
 150 #endif
 151 #ifdef TARGET_ARCH_arm
 152 # include "c2_globals_arm.hpp"
 153 #endif
 154 #ifdef TARGET_ARCH_ppc
 155 # include "c2_globals_ppc.hpp"
 156 #endif
 157 #ifdef TARGET_OS_FAMILY_linux
 158 # include "c2_globals_linux.hpp"
 159 #endif
 160 #ifdef TARGET_OS_FAMILY_solaris
 161 # include "c2_globals_solaris.hpp"
 162 #endif
 163 #ifdef TARGET_OS_FAMILY_windows
 164 # include "c2_globals_windows.hpp"
 165 #endif
 166 #ifdef TARGET_OS_FAMILY_aix
 167 # include "c2_globals_aix.hpp"
 168 #endif
 169 #ifdef TARGET_OS_FAMILY_bsd
 170 # include "c2_globals_bsd.hpp"
 171 #endif
 172 #endif
 173 #ifdef SHARK
 174 #ifdef TARGET_ARCH_zero
 175 # include "shark_globals_zero.hpp"
 176 #endif
 177 #endif
 178 
 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 180 define_pd_global(bool, BackgroundCompilation,        false);
 181 define_pd_global(bool, UseTLAB,                      false);
 182 define_pd_global(bool, CICompileOSR,                 false);
 183 define_pd_global(bool, UseTypeProfile,               false);
 184 define_pd_global(bool, UseOnStackReplacement,        false);
 185 define_pd_global(bool, InlineIntrinsics,             false);
 186 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 187 define_pd_global(bool, ProfileInterpreter,           false);
 188 define_pd_global(bool, ProfileTraps,                 false);
 189 define_pd_global(bool, TieredCompilation,            false);
 190 
 191 define_pd_global(intx, CompileThreshold,             0);
 192 define_pd_global(intx, BackEdgeThreshold,            0);
 193 
 194 define_pd_global(intx, OnStackReplacePercentage,     0);
 195 define_pd_global(bool, ResizeTLAB,                   false);
 196 define_pd_global(intx, FreqInlineSize,               0);
 197 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 198 define_pd_global(intx, InlineClassNatives,           true);
 199 define_pd_global(intx, InlineUnsafeOps,              true);
 200 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 201 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 202 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 203 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 204 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 205 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 206 define_pd_global(bool, NeverActAsServerClassMachine, true);
 207 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 208 #define CI_COMPILER_COUNT 0
 209 #else
 210 
 211 #ifdef COMPILER2
 212 #define CI_COMPILER_COUNT 2
 213 #else
 214 #define CI_COMPILER_COUNT 1
 215 #endif // COMPILER2
 216 
 217 #endif // no compilers
 218 
 219 // string type aliases used only in this file
 220 typedef const char* ccstr;
 221 typedef const char* ccstrlist;   // represents string arguments which accumulate
 222 
 223 struct Flag {
 224   enum Flags {
 225     // value origin
 226     DEFAULT          = 0,
 227     COMMAND_LINE     = 1,
 228     ENVIRON_VAR      = 2,
 229     CONFIG_FILE      = 3,
 230     MANAGEMENT       = 4,
 231     ERGONOMIC        = 5,
 232     ATTACH_ON_DEMAND = 6,
 233     INTERNAL         = 7,
 234 
 235     LAST_VALUE_ORIGIN = INTERNAL,
 236     VALUE_ORIGIN_BITS = 4,
 237     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 238 
 239     // flag kind
 240     KIND_PRODUCT            = 1 << 4,
 241     KIND_MANAGEABLE         = 1 << 5,
 242     KIND_DIAGNOSTIC         = 1 << 6,
 243     KIND_EXPERIMENTAL       = 1 << 7,
 244     KIND_NOT_PRODUCT        = 1 << 8,
 245     KIND_DEVELOP            = 1 << 9,
 246     KIND_PLATFORM_DEPENDENT = 1 << 10,
 247     KIND_READ_WRITE         = 1 << 11,
 248     KIND_C1                 = 1 << 12,
 249     KIND_C2                 = 1 << 13,
 250     KIND_ARCH               = 1 << 14,
 251     KIND_SHARK              = 1 << 15,
 252     KIND_LP64_PRODUCT       = 1 << 16,
 253     KIND_COMMERCIAL         = 1 << 17,
 254 
 255     KIND_MASK = ~VALUE_ORIGIN_MASK
 256   };
 257 
 258   const char* _type;
 259   const char* _name;
 260   void* _addr;
 261   NOT_PRODUCT(const char* _doc;)
 262   Flags _flags;
 263 
 264   // points to all Flags static array
 265   static Flag* flags;
 266 
 267   // number of flags
 268   static size_t numFlags;
 269 
 270   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 271   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 272 
 273   void check_writable();
 274 
 275   bool is_bool() const;
 276   bool get_bool() const;
 277   void set_bool(bool value);
 278 
 279   bool is_intx() const;
 280   intx get_intx() const;
 281   void set_intx(intx value);
 282 
 283   bool is_uintx() const;
 284   uintx get_uintx() const;
 285   void set_uintx(uintx value);
 286 
 287   bool is_uint64_t() const;
 288   uint64_t get_uint64_t() const;
 289   void set_uint64_t(uint64_t value);
 290 
 291   bool is_double() const;
 292   double get_double() const;
 293   void set_double(double value);
 294 
 295   bool is_ccstr() const;
 296   bool ccstr_accumulates() const;
 297   ccstr get_ccstr() const;
 298   void set_ccstr(ccstr value);
 299 
 300   Flags get_origin();
 301   void set_origin(Flags origin);
 302 
 303   bool is_default();
 304   bool is_ergonomic();
 305   bool is_command_line();
 306 
 307   bool is_product() const;
 308   bool is_manageable() const;
 309   bool is_diagnostic() const;
 310   bool is_experimental() const;
 311   bool is_notproduct() const;
 312   bool is_develop() const;
 313   bool is_read_write() const;
 314   bool is_commercial() const;
 315 
 316   bool is_constant_in_binary() const;
 317 
 318   bool is_unlocker() const;
 319   bool is_unlocked() const;
 320   bool is_writeable() const;
 321   bool is_external() const;
 322 
 323   bool is_unlocker_ext() const;
 324   bool is_unlocked_ext() const;
 325   bool is_writeable_ext() const;
 326   bool is_external_ext() const;
 327 
 328   void unlock_diagnostic();
 329 
 330   void get_locked_message(char*, int) const;
 331   void get_locked_message_ext(char*, int) const;
 332 
 333   void print_on(outputStream* st, bool withComments = false );
 334   void print_kind(outputStream* st);
 335   void print_as_flag(outputStream* st);
 336 };
 337 
 338 // debug flags control various aspects of the VM and are global accessible
 339 
 340 // use FlagSetting to temporarily change some debug flag
 341 // e.g. FlagSetting fs(DebugThisAndThat, true);
 342 // restored to previous value upon leaving scope
 343 class FlagSetting {
 344   bool val;
 345   bool* flag;
 346  public:
 347   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 348   ~FlagSetting()                       { *flag = val; }
 349 };
 350 
 351 
 352 class CounterSetting {
 353   intx* counter;
 354  public:
 355   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 356   ~CounterSetting()         { (*counter)--; }
 357 };
 358 
 359 
 360 class UIntFlagSetting {
 361   uintx val;
 362   uintx* flag;
 363  public:
 364   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 365   ~UIntFlagSetting()                         { *flag = val; }
 366 };
 367 
 368 
 369 class DoubleFlagSetting {
 370   double val;
 371   double* flag;
 372  public:
 373   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 374   ~DoubleFlagSetting()                           { *flag = val; }
 375 };
 376 
 377 
 378 class CommandLineFlags {
 379  public:
 380   static bool boolAt(const char* name, size_t len, bool* value);
 381   static bool boolAt(const char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 382   static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 383   static bool boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 384 
 385   static bool intxAt(const char* name, size_t len, intx* value);
 386   static bool intxAt(const char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 387   static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 388   static bool intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 389 
 390   static bool uintxAt(const char* name, size_t len, uintx* value);
 391   static bool uintxAt(const char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 392   static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 393   static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 394 
 395   static bool uint64_tAt(const char* name, size_t len, uint64_t* value);
 396   static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 397   static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 398   static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 399 
 400   static bool doubleAt(const char* name, size_t len, double* value);
 401   static bool doubleAt(const char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 402   static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 403   static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 404 
 405   static bool ccstrAt(const char* name, size_t len, ccstr* value);
 406   static bool ccstrAt(const char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 407   // Contract:  Flag will make private copy of the incoming value.
 408   // Outgoing value is always malloc-ed, and caller MUST call free.
 409   static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 410   static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 411 
 412   // Returns false if name is not a command line flag.
 413   static bool wasSetOnCmdline(const char* name, bool* value);
 414   static void printSetFlags(outputStream* out);
 415 
 416   static void printFlags(outputStream* out, bool withComments);
 417 
 418   static void verify() PRODUCT_RETURN;
 419 };
 420 
 421 // use this for flags that are true by default in the debug version but
 422 // false in the optimized version, and vice versa
 423 #ifdef ASSERT
 424 #define trueInDebug  true
 425 #define falseInDebug false
 426 #else
 427 #define trueInDebug  false
 428 #define falseInDebug true
 429 #endif
 430 
 431 // use this for flags that are true per default in the product build
 432 // but false in development builds, and vice versa
 433 #ifdef PRODUCT
 434 #define trueInProduct  true
 435 #define falseInProduct false
 436 #else
 437 #define trueInProduct  false
 438 #define falseInProduct true
 439 #endif
 440 
 441 #ifdef JAVASE_EMBEDDED
 442 #define falseInEmbedded false
 443 #else
 444 #define falseInEmbedded true
 445 #endif
 446 
 447 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 448 // product flags are always settable / visible
 449 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 450 
 451 // A flag must be declared with one of the following types:
 452 // bool, intx, uintx, ccstr.
 453 // The type "ccstr" is an alias for "const char*" and is used
 454 // only in this file, because the macrology requires single-token type names.
 455 
 456 // Note: Diagnostic options not meant for VM tuning or for product modes.
 457 // They are to be used for VM quality assurance or field diagnosis
 458 // of VM bugs.  They are hidden so that users will not be encouraged to
 459 // try them as if they were VM ordinary execution options.  However, they
 460 // are available in the product version of the VM.  Under instruction
 461 // from support engineers, VM customers can turn them on to collect
 462 // diagnostic information about VM problems.  To use a VM diagnostic
 463 // option, you must first specify +UnlockDiagnosticVMOptions.
 464 // (This master switch also affects the behavior of -Xprintflags.)
 465 //
 466 // experimental flags are in support of features that are not
 467 //    part of the officially supported product, but are available
 468 //    for experimenting with. They could, for example, be performance
 469 //    features that may not have undergone full or rigorous QA, but which may
 470 //    help performance in some cases and released for experimentation
 471 //    by the community of users and developers. This flag also allows one to
 472 //    be able to build a fully supported product that nonetheless also
 473 //    ships with some unsupported, lightly tested, experimental features.
 474 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 475 //    UnlockExperimentalVMOptions flag, which allows the control and
 476 //    modification of the experimental flags.
 477 //
 478 // Nota bene: neither diagnostic nor experimental options should be used casually,
 479 //    and they are not supported on production loads, except under explicit
 480 //    direction from support engineers.
 481 //
 482 // manageable flags are writeable external product flags.
 483 //    They are dynamically writeable through the JDK management interface
 484 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 485 //    These flags are external exported interface (see CCC).  The list of
 486 //    manageable flags can be queried programmatically through the management
 487 //    interface.
 488 //
 489 //    A flag can be made as "manageable" only if
 490 //    - the flag is defined in a CCC as an external exported interface.
 491 //    - the VM implementation supports dynamic setting of the flag.
 492 //      This implies that the VM must *always* query the flag variable
 493 //      and not reuse state related to the flag state at any given time.
 494 //    - you want the flag to be queried programmatically by the customers.
 495 //
 496 // product_rw flags are writeable internal product flags.
 497 //    They are like "manageable" flags but for internal/private use.
 498 //    The list of product_rw flags are internal/private flags which
 499 //    may be changed/removed in a future release.  It can be set
 500 //    through the management interface to get/set value
 501 //    when the name of flag is supplied.
 502 //
 503 //    A flag can be made as "product_rw" only if
 504 //    - the VM implementation supports dynamic setting of the flag.
 505 //      This implies that the VM must *always* query the flag variable
 506 //      and not reuse state related to the flag state at any given time.
 507 //
 508 // Note that when there is a need to support develop flags to be writeable,
 509 // it can be done in the same way as product_rw.
 510 
 511 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 512                                                                             \
 513   lp64_product(bool, UseCompressedOops, false,                              \
 514           "Use 32-bit object references in 64-bit VM. "                     \
 515           "lp64_product means flag is always constant in 32 bit VM")        \
 516                                                                             \
 517   lp64_product(bool, UseCompressedClassPointers, false,                     \
 518           "Use 32-bit class pointers in 64-bit VM. "                        \
 519           "lp64_product means flag is always constant in 32 bit VM")        \
 520                                                                             \
 521   notproduct(bool, CheckCompressedOops, true,                               \
 522           "Generate checks in encoding/decoding code in debug VM")          \
 523                                                                             \
 524   product_pd(uintx, HeapBaseMinAddress,                                     \
 525           "OS specific low limit for heap base address")                    \
 526                                                                             \
 527   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 528           "Print compressed oops base address and encoding mode")           \
 529                                                                             \
 530   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 531           "Default object alignment in bytes, 8 is minimum")                \
 532                                                                             \
 533   product(bool, AssumeMP, false,                                            \
 534           "Instruct the VM to assume multiple processors are available")    \
 535                                                                             \
 536   /* UseMembar is theoretically a temp flag used for memory barrier         \
 537    * removal testing.  It was supposed to be removed before FCS but has     \
 538    * been re-added (see 6401008) */                                         \
 539   product_pd(bool, UseMembar,                                               \
 540           "(Unstable) Issues membars on thread state transitions")          \
 541                                                                             \
 542   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 543           "Clean the chunk pool asynchronously")                            \
 544                                                                             \
 545   /* Temporary: See 6948537 */                                              \
 546   experimental(bool, UseMemSetInBOT, true,                                  \
 547           "(Unstable) uses memset in BOT updates in GC code")               \
 548                                                                             \
 549   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 550           "Enable normal processing of flags relating to field diagnostics")\
 551                                                                             \
 552   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 553           "Enable normal processing of flags relating to experimental "     \
 554           "features")                                                       \
 555                                                                             \
 556   product(bool, JavaMonitorsInStackTrace, true,                             \
 557           "Print information about Java monitor locks when the stacks are"  \
 558           "dumped")                                                         \
 559                                                                             \
 560   product_pd(bool, UseLargePages,                                           \
 561           "Use large page memory")                                          \
 562                                                                             \
 563   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 564           "Allocate large pages individually for better affinity")          \
 565                                                                             \
 566   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 567           "Fail large pages individual allocation")                         \
 568                                                                             \
 569   product(bool, UseLargePagesInMetaspace, false,                            \
 570           "Use large page memory in metaspace. "                            \
 571           "Only used if UseLargePages is enabled.")                         \
 572                                                                             \
 573   develop(bool, TracePageSizes, false,                                      \
 574           "Trace page size selection and usage")                            \
 575                                                                             \
 576   product(bool, UseNUMA, false,                                             \
 577           "Use NUMA if available")                                          \
 578                                                                             \
 579   product(bool, UseNUMAInterleaving, false,                                 \
 580           "Interleave memory across NUMA nodes if available")               \
 581                                                                             \
 582   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 583           "Granularity to use for NUMA interleaving on Windows OS")         \
 584                                                                             \
 585   product(bool, ForceNUMA, false,                                           \
 586           "Force NUMA optimizations on single-node/UMA systems")            \
 587                                                                             \
 588   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 589           "Percentage (0-100) used to weigh the current sample when "       \
 590           "computing exponentially decaying average for "                   \
 591           "AdaptiveNUMAChunkSizing")                                        \
 592                                                                             \
 593   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 594           "Do not reallocate more than this amount per collection")         \
 595                                                                             \
 596   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 597           "Enable adaptive chunk sizing for NUMA")                          \
 598                                                                             \
 599   product(bool, NUMAStats, false,                                           \
 600           "Print NUMA stats in detailed heap information")                  \
 601                                                                             \
 602   product(uintx, NUMAPageScanRate, 256,                                     \
 603           "Maximum number of pages to include in the page scan procedure")  \
 604                                                                             \
 605   product_pd(bool, NeedsDeoptSuspend,                                       \
 606           "True for register window machines (sparc/ia64)")                 \
 607                                                                             \
 608   product(intx, UseSSE, 99,                                                 \
 609           "Highest supported SSE instructions set on x86/x64")              \
 610                                                                             \
 611   product(bool, UseAES, false,                                              \
 612           "Control whether AES instructions can be used on x86/x64")        \
 613                                                                             \
 614   product(bool, UseSHA, false,                                              \
 615           "Control whether SHA instructions can be used on SPARC")          \
 616                                                                             \
 617   product(bool, UseGHASHIntrinsics, false,                                  \
 618           "Use intrinsics for GHASH versions of crypto")                    \
 619                                                                             \
 620   product(uintx, LargePageSizeInBytes, 0,                                   \
 621           "Large page size (0 to let VM choose the page size)")             \
 622                                                                             \
 623   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 624           "Use large pages if maximum heap is at least this big")           \
 625                                                                             \
 626   product(bool, ForceTimeHighResolution, false,                             \
 627           "Using high time resolution (for Win32 only)")                    \
 628                                                                             \
 629   develop(bool, TraceItables, false,                                        \
 630           "Trace initialization and use of itables")                        \
 631                                                                             \
 632   develop(bool, TracePcPatching, false,                                     \
 633           "Trace usage of frame::patch_pc")                                 \
 634                                                                             \
 635   develop(bool, TraceJumps, false,                                          \
 636           "Trace assembly jumps in thread ring buffer")                     \
 637                                                                             \
 638   develop(bool, TraceRelocator, false,                                      \
 639           "Trace the bytecode relocator")                                   \
 640                                                                             \
 641   develop(bool, TraceLongCompiles, false,                                   \
 642           "Print out every time compilation is longer than "                \
 643           "a given threshold")                                              \
 644                                                                             \
 645   develop(bool, SafepointALot, false,                                       \
 646           "Generate a lot of safepoints. This works with "                  \
 647           "GuaranteedSafepointInterval")                                    \
 648                                                                             \
 649   product_pd(bool, BackgroundCompilation,                                   \
 650           "A thread requesting compilation is not blocked during "          \
 651           "compilation")                                                    \
 652                                                                             \
 653   product(bool, PrintVMQWaitTime, false,                                    \
 654           "Print out the waiting time in VM operation queue")               \
 655                                                                             \
 656   develop(bool, NoYieldsInMicrolock, false,                                 \
 657           "Disable yields in microlock")                                    \
 658                                                                             \
 659   develop(bool, TraceOopMapGeneration, false,                               \
 660           "Show OopMapGeneration")                                          \
 661                                                                             \
 662   product(bool, MethodFlushing, true,                                       \
 663           "Reclamation of zombie and not-entrant methods")                  \
 664                                                                             \
 665   develop(bool, VerifyStack, false,                                         \
 666           "Verify stack of each thread when it is entering a runtime call") \
 667                                                                             \
 668   diagnostic(bool, ForceUnreachable, false,                                 \
 669           "Make all non code cache addresses to be unreachable by "         \
 670           "forcing use of 64bit literal fixups")                            \
 671                                                                             \
 672   notproduct(bool, StressDerivedPointers, false,                            \
 673           "Force scavenge when a derived pointer is detected on stack "     \
 674           "after rtm call")                                                 \
 675                                                                             \
 676   develop(bool, TraceDerivedPointers, false,                                \
 677           "Trace traversal of derived pointers on stack")                   \
 678                                                                             \
 679   notproduct(bool, TraceCodeBlobStacks, false,                              \
 680           "Trace stack-walk of codeblobs")                                  \
 681                                                                             \
 682   product(bool, PrintJNIResolving, false,                                   \
 683           "Used to implement -v:jni")                                       \
 684                                                                             \
 685   notproduct(bool, PrintRewrites, false,                                    \
 686           "Print methods that are being rewritten")                         \
 687                                                                             \
 688   product(bool, UseInlineCaches, true,                                      \
 689           "Use Inline Caches for virtual calls ")                           \
 690                                                                             \
 691   develop(bool, InlineArrayCopy, true,                                      \
 692           "Inline arraycopy native that is known to be part of "            \
 693           "base library DLL")                                               \
 694                                                                             \
 695   develop(bool, InlineObjectHash, true,                                     \
 696           "Inline Object::hashCode() native that is known to be part "      \
 697           "of base library DLL")                                            \
 698                                                                             \
 699   develop(bool, InlineNatives, true,                                        \
 700           "Inline natives that are known to be part of base library DLL")   \
 701                                                                             \
 702   develop(bool, InlineMathNatives, true,                                    \
 703           "Inline SinD, CosD, etc.")                                        \
 704                                                                             \
 705   develop(bool, InlineClassNatives, true,                                   \
 706           "Inline Class.isInstance, etc")                                   \
 707                                                                             \
 708   develop(bool, InlineThreadNatives, true,                                  \
 709           "Inline Thread.currentThread, etc")                               \
 710                                                                             \
 711   develop(bool, InlineUnsafeOps, true,                                      \
 712           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 713                                                                             \
 714   product(bool, CriticalJNINatives, true,                                   \
 715           "Check for critical JNI entry points")                            \
 716                                                                             \
 717   notproduct(bool, StressCriticalJNINatives, false,                         \
 718           "Exercise register saving code in critical natives")              \
 719                                                                             \
 720   product(bool, UseSSE42Intrinsics, false,                                  \
 721           "SSE4.2 versions of intrinsics")                                  \
 722                                                                             \
 723   product(bool, UseAESIntrinsics, false,                                    \
 724           "Use intrinsics for AES versions of crypto")                      \
 725                                                                             \
 726   product(bool, UseSHA1Intrinsics, false,                                   \
 727           "Use intrinsics for SHA-1 crypto hash function")                  \
 728                                                                             \
 729   product(bool, UseSHA256Intrinsics, false,                                 \
 730           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions")   \
 731                                                                             \
 732   product(bool, UseSHA512Intrinsics, false,                                 \
 733           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions")   \
 734                                                                             \
 735   product(bool, UseCRC32Intrinsics, false,                                  \
 736           "use intrinsics for java.util.zip.CRC32")                         \
 737                                                                             \
 738   develop(bool, TraceCallFixup, false,                                      \
 739           "Trace all call fixups")                                          \
 740                                                                             \
 741   develop(bool, DeoptimizeALot, false,                                      \
 742           "Deoptimize at every exit from the runtime system")               \
 743                                                                             \
 744   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 745           "A comma separated list of bcis to deoptimize at")                \
 746                                                                             \
 747   product(bool, DeoptimizeRandom, false,                                    \
 748           "Deoptimize random frames on random exit from the runtime system")\
 749                                                                             \
 750   notproduct(bool, ZombieALot, false,                                       \
 751           "Create zombies (non-entrant) at exit from the runtime system")   \
 752                                                                             \
 753   product(bool, UnlinkSymbolsALot, false,                                   \
 754           "Unlink unreferenced symbols from the symbol table at safepoints")\
 755                                                                             \
 756   notproduct(bool, WalkStackALot, false,                                    \
 757           "Trace stack (no print) at every exit from the runtime system")   \
 758                                                                             \
 759   product(bool, Debugging, false,                                           \
 760           "Set when executing debug methods in debug.cpp "                  \
 761           "(to prevent triggering assertions)")                             \
 762                                                                             \
 763   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 764           "Enable strict checks that safepoints cannot happen for threads " \
 765           "that use No_Safepoint_Verifier")                                 \
 766                                                                             \
 767   notproduct(bool, VerifyLastFrame, false,                                  \
 768           "Verify oops on last frame on entry to VM")                       \
 769                                                                             \
 770   develop(bool, TraceHandleAllocation, false,                               \
 771           "Print out warnings when suspiciously many handles are allocated")\
 772                                                                             \
 773   product(bool, UseCompilerSafepoints, true,                                \
 774           "Stop at safepoints in compiled code")                            \
 775                                                                             \
 776   product(bool, FailOverToOldVerifier, true,                                \
 777           "Fail over to old verifier when split verifier fails")            \
 778                                                                             \
 779   develop(bool, ShowSafepointMsgs, false,                                   \
 780           "Show message about safepoint synchronization")                   \
 781                                                                             \
 782   product(bool, SafepointTimeout, false,                                    \
 783           "Time out and warn or fail after SafepointTimeoutDelay "          \
 784           "milliseconds if failed to reach safepoint")                      \
 785                                                                             \
 786   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 787           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 788                                                                             \
 789   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 790   /* typically, at most a few retries are needed */                         \
 791   product(intx, SuspendRetryCount, 50,                                      \
 792           "Maximum retry count for an external suspend request")            \
 793                                                                             \
 794   product(intx, SuspendRetryDelay, 5,                                       \
 795           "Milliseconds to delay per retry (* current_retry_count)")        \
 796                                                                             \
 797   product(bool, AssertOnSuspendWaitFailure, false,                          \
 798           "Assert/Guarantee on external suspend wait failure")              \
 799                                                                             \
 800   product(bool, TraceSuspendWaitFailures, false,                            \
 801           "Trace external suspend wait failures")                           \
 802                                                                             \
 803   product(bool, MaxFDLimit, true,                                           \
 804           "Bump the number of file descriptors to maximum in Solaris")      \
 805                                                                             \
 806   diagnostic(bool, LogEvents, true,                                         \
 807           "Enable the various ring buffer event logs")                      \
 808                                                                             \
 809   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 810           "Number of ring buffer event logs")                               \
 811                                                                             \
 812   product(bool, BytecodeVerificationRemote, true,                           \
 813           "Enable the Java bytecode verifier for remote classes")           \
 814                                                                             \
 815   product(bool, BytecodeVerificationLocal, false,                           \
 816           "Enable the Java bytecode verifier for local classes")            \
 817                                                                             \
 818   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 819           "Force exceptions on FP stack under/overflow")                    \
 820                                                                             \
 821   develop(bool, VerifyStackAtCalls, false,                                  \
 822           "Verify that the stack pointer is unchanged after calls")         \
 823                                                                             \
 824   develop(bool, TraceJavaAssertions, false,                                 \
 825           "Trace java language assertions")                                 \
 826                                                                             \
 827   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 828           "Temporary - see javaClasses.cpp")                                \
 829                                                                             \
 830   notproduct(bool, PrintMallocFree, false,                                  \
 831           "Trace calls to C heap malloc/free allocation")                   \
 832                                                                             \
 833   product(bool, PrintOopAddress, false,                                     \
 834           "Always print the location of the oop")                           \
 835                                                                             \
 836   notproduct(bool, VerifyCodeCacheOften, false,                             \
 837           "Verify compiled-code cache often")                               \
 838                                                                             \
 839   develop(bool, ZapDeadCompiledLocals, false,                               \
 840           "Zap dead locals in compiler frames")                             \
 841                                                                             \
 842   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 843           "Zap dead locals (old version, zaps all frames when "             \
 844           "entering the VM")                                                \
 845                                                                             \
 846   notproduct(bool, CheckOopishValues, false,                                \
 847           "Warn if value contains oop (requires ZapDeadLocals)")            \
 848                                                                             \
 849   develop(bool, UseMallocOnly, false,                                       \
 850           "Use only malloc/free for allocation (no resource area/arena)")   \
 851                                                                             \
 852   develop(bool, PrintMalloc, false,                                         \
 853           "Print all malloc/free calls")                                    \
 854                                                                             \
 855   develop(bool, PrintMallocStatistics, false,                               \
 856           "Print malloc/free statistics")                                   \
 857                                                                             \
 858   develop(bool, ZapResourceArea, trueInDebug,                               \
 859           "Zap freed resource/arena space with 0xABABABAB")                 \
 860                                                                             \
 861   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 862           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 863                                                                             \
 864   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 865           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 866                                                                             \
 867   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 868           "Zap allocated/freed stack segments with 0xFADFADED")             \
 869                                                                             \
 870   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 871           "Zap unused heap space with 0xBAADBABE")                          \
 872                                                                             \
 873   develop(bool, TraceZapUnusedHeapArea, false,                              \
 874           "Trace zapping of unused heap space")                             \
 875                                                                             \
 876   develop(bool, CheckZapUnusedHeapArea, false,                              \
 877           "Check zapping of unused heap space")                             \
 878                                                                             \
 879   develop(bool, ZapFillerObjects, trueInDebug,                              \
 880           "Zap filler objects with 0xDEAFBABE")                             \
 881                                                                             \
 882   develop(bool, PrintVMMessages, true,                                      \
 883           "Print VM messages on console")                                   \
 884                                                                             \
 885   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 886           "Print the time the application has been running")                \
 887                                                                             \
 888   product(bool, PrintGCApplicationStoppedTime, false,                       \
 889           "Print the time the application has been stopped")                \
 890                                                                             \
 891   diagnostic(bool, VerboseVerification, false,                              \
 892           "Display detailed verification details")                          \
 893                                                                             \
 894   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 895           "If > 0, provokes an error after VM initialization; the value "   \
 896           "determines which error to provoke. See test_error_handler() "    \
 897           "in debug.cpp.")                                                  \
 898                                                                             \
 899   develop(bool, Verbose, false,                                             \
 900           "Print additional debugging information from other modes")        \
 901                                                                             \
 902   develop(bool, PrintMiscellaneous, false,                                  \
 903           "Print uncategorized debugging information (requires +Verbose)")  \
 904                                                                             \
 905   develop(bool, WizardMode, false,                                          \
 906           "Print much more debugging information")                          \
 907                                                                             \
 908   product(bool, ShowMessageBoxOnError, false,                               \
 909           "Keep process alive on VM fatal error")                           \
 910                                                                             \
 911   product(bool, CreateMinidumpOnCrash, false,                               \
 912           "Create minidump on VM fatal error")                              \
 913                                                                             \
 914   product_pd(bool, UseOSErrorReporting,                                     \
 915           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 916                                                                             \
 917   product(bool, SuppressFatalErrorMessage, false,                           \
 918           "Report NO fatal error message (avoid deadlock)")                 \
 919                                                                             \
 920   product(ccstrlist, OnError, "",                                           \
 921           "Run user-defined commands on fatal error; see VMError.cpp "      \
 922           "for examples")                                                   \
 923                                                                             \
 924   product(ccstrlist, OnOutOfMemoryError, "",                                \
 925           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 926                                                                             \
 927   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 928           "Dump heap to file before any major stop-the-world GC")           \
 929                                                                             \
 930   manageable(bool, HeapDumpAfterFullGC, false,                              \
 931           "Dump heap to file after any major stop-the-world GC")            \
 932                                                                             \
 933   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 934           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 935                                                                             \
 936   manageable(ccstr, HeapDumpPath, NULL,                                     \
 937           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 938           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 939           "in the working directory)")                                      \
 940                                                                             \
 941   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 942           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 943           "when the heap usage is larger than this")                        \
 944                                                                             \
 945   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 946           "Approximate segment size when generating a segmented heap dump") \
 947                                                                             \
 948   develop(bool, BreakAtWarning, false,                                      \
 949           "Execute breakpoint upon encountering VM warning")                \
 950                                                                             \
 951   develop(bool, TraceVMOperation, false,                                    \
 952           "Trace VM operations")                                            \
 953                                                                             \
 954   develop(bool, UseFakeTimers, false,                                       \
 955           "Tell whether the VM should use system time or a fake timer")     \
 956                                                                             \
 957   product(ccstr, NativeMemoryTracking, "off",                               \
 958           "Native memory tracking options")                                 \
 959                                                                             \
 960   diagnostic(bool, PrintNMTStatistics, false,                               \
 961           "Print native memory tracking summary data if it is on")          \
 962                                                                             \
 963   diagnostic(bool, LogCompilation, false,                                   \
 964           "Log compilation activity in detail to LogFile")                  \
 965                                                                             \
 966   product(bool, PrintCompilation, false,                                    \
 967           "Print compilations")                                             \
 968                                                                             \
 969   diagnostic(bool, TraceNMethodInstalls, false,                             \
 970           "Trace nmethod installation")                                     \
 971                                                                             \
 972   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 973           "0: do not allow scavengable oops in the code cache; "            \
 974           "1: allow scavenging from the code cache; "                       \
 975           "2: emit as many constants as the compiler can see")              \
 976                                                                             \
 977   product(bool, AlwaysRestoreFPU, false,                                    \
 978           "Restore the FPU control word after every JNI call (expensive)")  \
 979                                                                             \
 980   diagnostic(bool, PrintCompilation2, false,                                \
 981           "Print additional statistics per compilation")                    \
 982                                                                             \
 983   diagnostic(bool, PrintAdapterHandlers, false,                             \
 984           "Print code generated for i2c/c2i adapters")                      \
 985                                                                             \
 986   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 987           "Verify that i2c/c2i adapters are called properly")               \
 988                                                                             \
 989   develop(bool, VerifyAdapterSharing, false,                                \
 990           "Verify that the code for shared adapters is the equivalent")     \
 991                                                                             \
 992   diagnostic(bool, PrintAssembly, false,                                    \
 993           "Print assembly code (using external disassembler.so)")           \
 994                                                                             \
 995   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 996           "Print options string passed to disassembler.so")                 \
 997                                                                             \
 998   diagnostic(bool, PrintNMethods, false,                                    \
 999           "Print assembly code for nmethods when generated")                \
1000                                                                             \
1001   diagnostic(bool, PrintNativeNMethods, false,                              \
1002           "Print assembly code for native nmethods when generated")         \
1003                                                                             \
1004   develop(bool, PrintDebugInfo, false,                                      \
1005           "Print debug information for all nmethods when generated")        \
1006                                                                             \
1007   develop(bool, PrintRelocations, false,                                    \
1008           "Print relocation information for all nmethods when generated")   \
1009                                                                             \
1010   develop(bool, PrintDependencies, false,                                   \
1011           "Print dependency information for all nmethods when generated")   \
1012                                                                             \
1013   develop(bool, PrintExceptionHandlers, false,                              \
1014           "Print exception handler tables for all nmethods when generated") \
1015                                                                             \
1016   develop(bool, StressCompiledExceptionHandlers, false,                     \
1017           "Exercise compiled exception handlers")                           \
1018                                                                             \
1019   develop(bool, InterceptOSException, false,                                \
1020           "Start debugger when an implicit OS (e.g. NULL) "                 \
1021           "exception happens")                                              \
1022                                                                             \
1023   product(bool, PrintCodeCache, false,                                      \
1024           "Print the code cache memory usage when exiting")                 \
1025                                                                             \
1026   develop(bool, PrintCodeCache2, false,                                     \
1027           "Print detailed usage information on the code cache when exiting")\
1028                                                                             \
1029   product(bool, PrintCodeCacheOnCompilation, false,                         \
1030           "Print the code cache memory usage each time a method is "        \
1031           "compiled")                                                       \
1032                                                                             \
1033   diagnostic(bool, PrintStubCode, false,                                    \
1034           "Print generated stub code")                                      \
1035                                                                             \
1036   product(bool, StackTraceInThrowable, true,                                \
1037           "Collect backtrace in throwable when exception happens")          \
1038                                                                             \
1039   product(bool, OmitStackTraceInFastThrow, true,                            \
1040           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1041                                                                             \
1042   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1043           "Print bytecode statistics when dumping profiler output")         \
1044                                                                             \
1045   product(bool, ProfilerRecordPC, false,                                    \
1046           "Collect ticks for each 16 byte interval of compiled code")       \
1047                                                                             \
1048   product(bool, ProfileVM, false,                                           \
1049           "Profile ticks that fall within VM (either in the VM Thread "     \
1050           "or VM code called through stubs)")                               \
1051                                                                             \
1052   product(bool, ProfileIntervals, false,                                    \
1053           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1054                                                                             \
1055   notproduct(bool, ProfilerCheckIntervals, false,                           \
1056           "Collect and print information on spacing of profiler ticks")     \
1057                                                                             \
1058   develop(bool, PrintJVMWarnings, false,                                    \
1059           "Print warnings for unimplemented JVM functions")                 \
1060                                                                             \
1061   product(bool, PrintWarnings, true,                                        \
1062           "Print JVM warnings to output stream")                            \
1063                                                                             \
1064   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1065           "Print warnings for stalled SpinLocks")                           \
1066                                                                             \
1067   product(bool, RegisterFinalizersAtInit, true,                             \
1068           "Register finalizable objects at end of Object.<init> or "        \
1069           "after allocation")                                               \
1070                                                                             \
1071   develop(bool, RegisterReferences, true,                                   \
1072           "Tell whether the VM should register soft/weak/final/phantom "    \
1073           "references")                                                     \
1074                                                                             \
1075   develop(bool, IgnoreRewrites, false,                                      \
1076           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1077           "This is unsafe!")                                                \
1078                                                                             \
1079   develop(bool, PrintCodeCacheExtension, false,                             \
1080           "Print extension of code cache")                                  \
1081                                                                             \
1082   develop(bool, UsePrivilegedStack, true,                                   \
1083           "Enable the security JVM functions")                              \
1084                                                                             \
1085   develop(bool, ProtectionDomainVerification, true,                         \
1086           "Verify protection domain before resolution in system dictionary")\
1087                                                                             \
1088   product(bool, ClassUnloading, true,                                       \
1089           "Do unloading of classes")                                        \
1090                                                                             \
1091   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1092           "Do unloading of classes with a concurrent marking cycle")        \
1093                                                                             \
1094   develop(bool, DisableStartThread, false,                                  \
1095           "Disable starting of additional Java threads "                    \
1096           "(for debugging only)")                                           \
1097                                                                             \
1098   develop(bool, MemProfiling, false,                                        \
1099           "Write memory usage profiling to log file")                       \
1100                                                                             \
1101   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1102           "Print the system dictionary at exit")                            \
1103                                                                             \
1104   experimental(intx, PredictedLoadedClassCount, 0,                          \
1105           "Experimental: Tune loaded class cache starting size")            \
1106                                                                             \
1107   diagnostic(bool, UnsyncloadClass, false,                                  \
1108           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1109           "class loader must call VM synchronized for findClass "           \
1110           "and defineClass.")                                               \
1111                                                                             \
1112   product(bool, AlwaysLockClassLoader, false,                               \
1113           "Require the VM to acquire the class loader lock before calling " \
1114           "loadClass() even for class loaders registering "                 \
1115           "as parallel capable")                                            \
1116                                                                             \
1117   product(bool, AllowParallelDefineClass, false,                            \
1118           "Allow parallel defineClass requests for class loaders "          \
1119           "registering as parallel capable")                                \
1120                                                                             \
1121   product(bool, MustCallLoadClassInternal, false,                           \
1122           "Call loadClassInternal() rather than loadClass()")               \
1123                                                                             \
1124   product_pd(bool, DontYieldALot,                                           \
1125           "Throw away obvious excess yield calls (for Solaris only)")       \
1126                                                                             \
1127   product_pd(bool, ConvertSleepToYield,                                     \
1128           "Convert sleep(0) to thread yield "                               \
1129           "(may be off for Solaris to improve GUI)")                        \
1130                                                                             \
1131   product(bool, ConvertYieldToSleep, false,                                 \
1132           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1133           "behavior (Solaris only)")                                        \
1134                                                                             \
1135   product(bool, UseBoundThreads, true,                                      \
1136           "Bind user level threads to kernel threads (for Solaris only)")   \
1137                                                                             \
1138   develop(bool, UseDetachedThreads, true,                                   \
1139           "Use detached threads that are recycled upon termination "        \
1140           "(for Solaris only)")                                             \
1141                                                                             \
1142   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
1143                "Disable the use of stack guard pages if the JVM is loaded " \
1144                "on the primordial process thread")                          \
1145                                                                             \
1146   product(bool, UseLWPSynchronization, true,                                \
1147           "Use LWP-based instead of libthread-based synchronization "       \
1148           "(SPARC only)")                                                   \
1149                                                                             \
1150   product(ccstr, SyncKnobs, NULL,                                           \
1151           "(Unstable) Various monitor synchronization tunables")            \
1152                                                                             \
1153   product(intx, EmitSync, 0,                                                \
1154           "(Unsafe, Unstable) "                                             \
1155           "Control emission of inline sync fast-path code")                 \
1156                                                                             \
1157   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1158                                                                             \
1159   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1160                                                                             \
1161   product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1162                                                                             \
1163   product(intx, SyncVerbose, 0, "(Unstable)")                               \
1164                                                                             \
1165   product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")                    \
1166                                                                             \
1167   product(intx, hashCode, 5,                                                \
1168           "(Unstable) select hashCode generation algorithm")                \
1169                                                                             \
1170   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1171           "(Unstable, Linux-specific) "                                     \
1172           "avoid NPTL-FUTEX hang pthread_cond_timedwait")                   \
1173                                                                             \
1174   product(bool, FilterSpuriousWakeups, true,                                \
1175           "Prevent spurious or premature wakeups from object.wait "         \
1176           "(Solaris only)")                                                 \
1177                                                                             \
1178   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1179                                                                             \
1180   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1181                                                                             \
1182   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1183                                                                             \
1184   develop(bool, UsePthreads, false,                                         \
1185           "Use pthread-based instead of libthread-based synchronization "   \
1186           "(SPARC only)")                                                   \
1187                                                                             \
1188   product(bool, AdjustConcurrency, false,                                   \
1189           "Call thr_setconcurrency at thread creation time to avoid "       \
1190           "LWP starvation on MP systems (for Solaris Only)")                \
1191                                                                             \
1192   product(bool, ReduceSignalUsage, false,                                   \
1193           "Reduce the use of OS signals in Java and/or the VM")             \
1194                                                                             \
1195   develop_pd(bool, ShareVtableStubs,                                        \
1196           "Share vtable stubs (smaller code but worse branch prediction")   \
1197                                                                             \
1198   develop(bool, LoadLineNumberTables, true,                                 \
1199           "Tell whether the class file parser loads line number tables")    \
1200                                                                             \
1201   develop(bool, LoadLocalVariableTables, true,                              \
1202           "Tell whether the class file parser loads local variable tables") \
1203                                                                             \
1204   develop(bool, LoadLocalVariableTypeTables, true,                          \
1205           "Tell whether the class file parser loads local variable type"    \
1206           "tables")                                                         \
1207                                                                             \
1208   product(bool, AllowUserSignalHandlers, false,                             \
1209           "Do not complain if the application installs signal handlers "    \
1210           "(Solaris & Linux only)")                                         \
1211                                                                             \
1212   product(bool, UseSignalChaining, true,                                    \
1213           "Use signal-chaining to invoke signal handlers installed "        \
1214           "by the application (Solaris & Linux only)")                      \
1215                                                                             \
1216   product(bool, UseAltSigs, false,                                          \
1217           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1218           "internal signals (Solaris only)")                                \
1219                                                                             \
1220   product(bool, AllowJNIEnvProxy, false,                                    \
1221           "Allow JNIEnv proxies for jdbx")                                  \
1222                                                                             \
1223   product(bool, JNIDetachReleasesMonitors, true,                            \
1224           "JNI DetachCurrentThread releases monitors owned by thread")      \
1225                                                                             \
1226   product(bool, RestoreMXCSROnJNICalls, false,                              \
1227           "Restore MXCSR when returning from JNI calls")                    \
1228                                                                             \
1229   product(bool, CheckJNICalls, false,                                       \
1230           "Verify all arguments to JNI calls")                              \
1231                                                                             \
1232   product(bool, CheckEndorsedAndExtDirs, false,                             \
1233           "Verify the endorsed and extension directories are not used")     \
1234                                                                             \
1235   product(bool, UseFastJNIAccessors, true,                                  \
1236           "Use optimized versions of Get<Primitive>Field")                  \
1237                                                                             \
1238   product(intx, MaxJNILocalCapacity, 65536,                                 \
1239           "Maximum allowable local JNI handle capacity to "                 \
1240           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1241           "where <= 0 is unlimited, default: 65536")                        \
1242                                                                             \
1243   product(bool, EagerXrunInit, false,                                       \
1244           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1245           "but not all -Xrun libraries may support the state of the VM "    \
1246           "at this time")                                                   \
1247                                                                             \
1248   product(bool, PreserveAllAnnotations, false,                              \
1249           "Preserve RuntimeInvisibleAnnotations as well "                   \
1250           "as RuntimeVisibleAnnotations")                                   \
1251                                                                             \
1252   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1253           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1254                                                                             \
1255   product(bool, LazyBootClassLoader, true,                                  \
1256           "Enable/disable lazy opening of boot class path entries")         \
1257                                                                             \
1258   product(bool, UseXMMForArrayCopy, false,                                  \
1259           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1260                                                                             \
1261   product(intx, FieldsAllocationStyle, 1,                                   \
1262           "0 - type based with oops first, 1 - with oops last, "            \
1263           "2 - oops in super and sub classes are together")                 \
1264                                                                             \
1265   product(bool, CompactFields, true,                                        \
1266           "Allocate nonstatic fields in gaps between previous fields")      \
1267                                                                             \
1268   notproduct(bool, PrintFieldLayout, false,                                 \
1269           "Print field layout for each class")                              \
1270                                                                             \
1271   product(intx, ContendedPaddingWidth, 128,                                 \
1272           "How many bytes to pad the fields/classes marked @Contended with")\
1273                                                                             \
1274   product(bool, EnableContended, true,                                      \
1275           "Enable @Contended annotation support")                           \
1276                                                                             \
1277   product(bool, RestrictContended, true,                                    \
1278           "Restrict @Contended to trusted classes")                         \
1279                                                                             \
1280   product(bool, UseBiasedLocking, true,                                     \
1281           "Enable biased locking in JVM")                                   \
1282                                                                             \
1283   product(intx, BiasedLockingStartupDelay, 4000,                            \
1284           "Number of milliseconds to wait before enabling biased locking")  \
1285                                                                             \
1286   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1287           "Print statistics of biased locking in JVM")                      \
1288                                                                             \
1289   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1290           "Threshold of number of revocations per type to try to "          \
1291           "rebias all objects in the heap of that type")                    \
1292                                                                             \
1293   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1294           "Threshold of number of revocations per type to permanently "     \
1295           "revoke biases of all objects in the heap of that type")          \
1296                                                                             \
1297   product(intx, BiasedLockingDecayTime, 25000,                              \
1298           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1299           "type after previous bulk rebias")                                \
1300                                                                             \
1301   product(bool, ExitOnOutOfMemoryError, false,                              \
1302           "JVM exits on the first occurrence of an out-of-memory error")    \
1303                                                                             \
1304   product(bool, CrashOnOutOfMemoryError, false,                             \
1305           "JVM aborts, producing an error log and core/mini dump, on the "  \
1306           "first occurrence of an out-of-memory error")                     \
1307                                                                             \
1308   /* tracing */                                                             \
1309                                                                             \
1310   notproduct(bool, TraceRuntimeCalls, false,                                \
1311           "Trace run-time calls")                                           \
1312                                                                             \
1313   develop(bool, TraceJNICalls, false,                                       \
1314           "Trace JNI calls")                                                \
1315                                                                             \
1316   develop(bool, StressRewriter, false,                                      \
1317           "Stress linktime bytecode rewriting")                             \
1318                                                                             \
1319   notproduct(bool, TraceJVMCalls, false,                                    \
1320           "Trace JVM calls")                                                \
1321                                                                             \
1322   product(ccstr, TraceJVMTI, NULL,                                          \
1323           "Trace flags for JVMTI functions and events")                     \
1324                                                                             \
1325   /* This option can change an EMCP method into an obsolete method. */      \
1326   /* This can affect tests that except specific methods to be EMCP. */      \
1327   /* This option should be used with caution. */                            \
1328   product(bool, StressLdcRewrite, false,                                    \
1329           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1330                                                                             \
1331   product(intx, TraceRedefineClasses, 0,                                    \
1332           "Trace level for JVMTI RedefineClasses")                          \
1333                                                                             \
1334   develop(bool, StressMethodComparator, false,                              \
1335           "Run the MethodComparator on all loaded methods")                 \
1336                                                                             \
1337   /* change to false by default sometime after Mustang */                   \
1338   product(bool, VerifyMergedCPBytecodes, true,                              \
1339           "Verify bytecodes after RedefineClasses constant pool merging")   \
1340                                                                             \
1341   develop(bool, TraceJNIHandleAllocation, false,                            \
1342           "Trace allocation/deallocation of JNI handle blocks")             \
1343                                                                             \
1344   develop(bool, TraceThreadEvents, false,                                   \
1345           "Trace all thread events")                                        \
1346                                                                             \
1347   develop(bool, TraceBytecodes, false,                                      \
1348           "Trace bytecode execution")                                       \
1349                                                                             \
1350   develop(bool, TraceClassInitialization, false,                            \
1351           "Trace class initialization")                                     \
1352                                                                             \
1353   develop(bool, TraceExceptions, false,                                     \
1354           "Trace exceptions")                                               \
1355                                                                             \
1356   develop(bool, TraceICs, false,                                            \
1357           "Trace inline cache changes")                                     \
1358                                                                             \
1359   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1360           "Trace method invocation counter overflow")                       \
1361                                                                             \
1362   develop(bool, TraceInlineCacheClearing, false,                            \
1363           "Trace clearing of inline caches in nmethods")                    \
1364                                                                             \
1365   develop(bool, TraceDependencies, false,                                   \
1366           "Trace dependencies")                                             \
1367                                                                             \
1368   develop(bool, VerifyDependencies, trueInDebug,                            \
1369           "Exercise and verify the compilation dependency mechanism")       \
1370                                                                             \
1371   develop(bool, TraceNewOopMapGeneration, false,                            \
1372           "Trace OopMapGeneration")                                         \
1373                                                                             \
1374   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1375           "Trace OopMapGeneration: print detailed cell states")             \
1376                                                                             \
1377   develop(bool, TimeOopMap, false,                                          \
1378           "Time calls to GenerateOopMap::compute_map() in sum")             \
1379                                                                             \
1380   develop(bool, TimeOopMap2, false,                                         \
1381           "Time calls to GenerateOopMap::compute_map() individually")       \
1382                                                                             \
1383   develop(bool, TraceMonitorMismatch, false,                                \
1384           "Trace monitor matching failures during OopMapGeneration")        \
1385                                                                             \
1386   develop(bool, TraceOopMapRewrites, false,                                 \
1387           "Trace rewriting of method oops during oop map generation")       \
1388                                                                             \
1389   develop(bool, TraceSafepoint, false,                                      \
1390           "Trace safepoint operations")                                     \
1391                                                                             \
1392   develop(bool, TraceICBuffer, false,                                       \
1393           "Trace usage of IC buffer")                                       \
1394                                                                             \
1395   develop(bool, TraceCompiledIC, false,                                     \
1396           "Trace changes of compiled IC")                                   \
1397                                                                             \
1398   notproduct(bool, TraceZapDeadLocals, false,                               \
1399           "Trace zapping dead locals")                                      \
1400                                                                             \
1401   develop(bool, TraceStartupTime, false,                                    \
1402           "Trace setup time")                                               \
1403                                                                             \
1404   develop(bool, TraceProtectionDomainVerification, false,                   \
1405           "Trace protection domain verification")                           \
1406                                                                             \
1407   develop(bool, TraceClearedExceptions, false,                              \
1408           "Print when an exception is forcibly cleared")                    \
1409                                                                             \
1410   product(bool, TraceClassResolution, false,                                \
1411           "Trace all constant pool resolutions (for debugging)")            \
1412                                                                             \
1413   product(bool, TraceBiasedLocking, false,                                  \
1414           "Trace biased locking in JVM")                                    \
1415                                                                             \
1416   product(bool, TraceMonitorInflation, false,                               \
1417           "Trace monitor inflation in JVM")                                 \
1418                                                                             \
1419   /* gc */                                                                  \
1420                                                                             \
1421   product(bool, UseSerialGC, false,                                         \
1422           "Use the Serial garbage collector")                               \
1423                                                                             \
1424   product(bool, UseG1GC, false,                                             \
1425           "Use the Garbage-First garbage collector")                        \
1426                                                                             \
1427   product(bool, UseParallelGC, false,                                       \
1428           "Use the Parallel Scavenge garbage collector")                    \
1429                                                                             \
1430   product(bool, UseParallelOldGC, false,                                    \
1431           "Use the Parallel Old garbage collector")                         \
1432                                                                             \
1433   product(bool, UseShenandoahGC, false,                                     \
1434           "Use the Shenandoah garbage collector")                           \
1435                                                                             \
1436   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1437           "How often should we maximally compact the heap (not allowing "   \
1438           "any dead space)")                                                \
1439                                                                             \
1440   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1441           "The collection count for the first maximum compaction")          \
1442                                                                             \
1443   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1444           "Use maximum compaction in the Parallel Old garbage collector "   \
1445           "for a system GC")                                                \
1446                                                                             \
1447   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1448           "The mean used by the parallel compact dead wood "                \
1449           "limiter (a number between 0-100)")                               \
1450                                                                             \
1451   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1452           "The standard deviation used by the parallel compact dead wood "  \
1453           "limiter (a number between 0-100)")                               \
1454                                                                             \
1455   product(uintx, ParallelGCThreads, 0,                                      \
1456           "Number of parallel threads parallel gc will use")                \
1457                                                                             \
1458   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1459           "Dynamically choose the number of parallel threads "              \
1460           "parallel gc will use")                                           \
1461                                                                             \
1462   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1463           "Force dynamic selection of the number of "                       \
1464           "parallel threads parallel gc will use to aid debugging")         \
1465                                                                             \
1466   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1467           "Size of heap (bytes) per GC thread used in calculating the "     \
1468           "number of GC threads")                                           \
1469                                                                             \
1470   product(bool, TraceDynamicGCThreads, false,                               \
1471           "Trace the dynamic GC thread usage")                              \
1472                                                                             \
1473   develop(bool, ParallelOldGCSplitALot, false,                              \
1474           "Provoke splitting (copying data from a young gen space to "      \
1475           "multiple destination spaces)")                                   \
1476                                                                             \
1477   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1478           "How often to provoke splitting a young gen space")               \
1479                                                                             \
1480   product(uintx, ConcGCThreads, 0,                                          \
1481           "Number of threads concurrent gc will use")                       \
1482                                                                             \
1483   product(uintx, YoungPLABSize, 4096,                                       \
1484           "Size of young gen promotion LAB's (in HeapWords)")               \
1485                                                                             \
1486   product(uintx, OldPLABSize, 1024,                                         \
1487           "Size of old gen promotion LAB's (in HeapWords)")                 \
1488                                                                             \
1489   product(uintx, GCTaskTimeStampEntries, 200,                               \
1490           "Number of time stamp entries per gc worker thread")              \
1491                                                                             \
1492   product(bool, AlwaysTenure, false,                                        \
1493           "Always tenure objects in eden (ParallelGC only)")                \
1494                                                                             \
1495   product(bool, NeverTenure, false,                                         \
1496           "Never tenure objects in eden, may tenure on overflow "           \
1497           "(ParallelGC only)")                                              \
1498                                                                             \
1499   product(bool, ScavengeBeforeFullGC, true,                                 \
1500           "Scavenge youngest generation before each full GC, "              \
1501           "used with UseParallelGC")                                        \
1502                                                                             \
1503   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1504           "Allow scavenges to occur when to-space contains objects")        \
1505                                                                             \
1506   product(bool, UseConcMarkSweepGC, false,                                  \
1507           "Use Concurrent Mark-Sweep GC in the old generation")             \
1508                                                                             \
1509   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1510           "A System.gc() request invokes a concurrent collection; "         \
1511           "(effective only when UseConcMarkSweepGC)")                       \
1512                                                                             \
1513   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1514           "A System.gc() request invokes a concurrent collection and "      \
1515           "also unloads classes during such a concurrent gc cycle "         \
1516           "(effective only when UseConcMarkSweepGC)")                       \
1517                                                                             \
1518   product(bool, GCLockerInvokesConcurrent, false,                           \
1519           "The exit of a JNI critical section necessitating a scavenge, "   \
1520           "also kicks off a background concurrent collection")              \
1521                                                                             \
1522   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1523           "How much the GC can expand the eden by while the GC locker "     \
1524           "is active (as a percentage)")                                    \
1525                                                                             \
1526   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1527           "Number of times to retry allocations when "                      \
1528           "blocked by the GC locker")                                       \
1529                                                                             \
1530   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1531           "Use adaptive free lists in the CMS generation")                  \
1532                                                                             \
1533   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1534           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1535                                                                             \
1536   develop(bool, RotateCMSCollectionTypes, false,                            \
1537           "Rotate the CMS collections among concurrent and STW")            \
1538                                                                             \
1539   product(bool, UseCMSBestFit, true,                                        \
1540           "Use CMS best fit allocation strategy")                           \
1541                                                                             \
1542   product(bool, UseCMSCollectionPassing, true,                              \
1543           "Use passing of collection from background to foreground")        \
1544                                                                             \
1545   product(bool, UseParNewGC, false,                                         \
1546           "Use parallel threads in the new generation")                     \
1547                                                                             \
1548   product(bool, ParallelGCVerbose, false,                                   \
1549           "Verbose output for parallel gc")                                 \
1550                                                                             \
1551   product(uintx, ParallelGCBufferWastePct, 10,                              \
1552           "Wasted fraction of parallel allocation buffer")                  \
1553                                                                             \
1554   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1555           "Retain parallel allocation buffers across scavenges; "           \
1556           "it is disabled because this currently conflicts with "           \
1557           "parallel card scanning under certain conditions.")               \
1558                                                                             \
1559   product(uintx, TargetPLABWastePct, 10,                                    \
1560           "Target wasted space in last buffer as percent of overall "       \
1561           "allocation")                                                     \
1562                                                                             \
1563   product(uintx, PLABWeight, 75,                                            \
1564           "Percentage (0-100) used to weigh the current sample when "       \
1565           "computing exponentially decaying average for ResizePLAB")        \
1566                                                                             \
1567   product(bool, ResizePLAB, true,                                           \
1568           "Dynamically resize (survivor space) promotion LAB's")            \
1569                                                                             \
1570   product(bool, PrintPLAB, false,                                           \
1571           "Print (survivor space) promotion LAB's sizing decisions")        \
1572                                                                             \
1573   product(intx, ParGCArrayScanChunk, 50,                                    \
1574           "Scan a subset of object array and push remainder, if array is "  \
1575           "bigger than this")                                               \
1576                                                                             \
1577   product(bool, ParGCUseLocalOverflow, false,                               \
1578           "Instead of a global overflow list, use local overflow stacks")   \
1579                                                                             \
1580   product(bool, ParGCTrimOverflow, true,                                    \
1581           "Eagerly trim the local overflow lists "                          \
1582           "(when ParGCUseLocalOverflow)")                                   \
1583                                                                             \
1584   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1585           "Simulate work queue overflow in ParNew")                         \
1586                                                                             \
1587   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1588           "An `interval' counter that determines how frequently "           \
1589           "we simulate overflow; a smaller number increases frequency")     \
1590                                                                             \
1591   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1592           "The desired number of objects to claim from the overflow list")  \
1593                                                                             \
1594   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1595           "The number of strides per worker thread that we divide up the "  \
1596           "card table scanning work into")                                  \
1597                                                                             \
1598   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1599           "The number of cards in each chunk of the parallel chunks used "  \
1600           "during card table scanning")                                     \
1601                                                                             \
1602   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1603           "Number of blocks to attempt to claim when refilling CMS LAB's "  \
1604           "for parallel GC")                                                \
1605                                                                             \
1606   product(uintx, OldPLABWeight, 50,                                         \
1607           "Percentage (0-100) used to weight the current sample when "      \
1608           "computing exponentially decaying average for resizing "          \
1609           "CMSParPromoteBlocksToClaim")                                     \
1610                                                                             \
1611   product(bool, ResizeOldPLAB, true,                                        \
1612           "Dynamically resize (old gen) promotion LAB's")                   \
1613                                                                             \
1614   product(bool, PrintOldPLAB, false,                                        \
1615           "Print (old gen) promotion LAB's sizing decisions")               \
1616                                                                             \
1617   product(uintx, CMSOldPLABMin, 16,                                         \
1618           "Minimum size of CMS gen promotion LAB caches per worker "        \
1619           "per block size")                                                 \
1620                                                                             \
1621   product(uintx, CMSOldPLABMax, 1024,                                       \
1622           "Maximum size of CMS gen promotion LAB caches per worker "        \
1623           "per block size")                                                 \
1624                                                                             \
1625   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1626           "Nominal number of refills of CMS gen promotion LAB cache "       \
1627           "per worker per block size")                                      \
1628                                                                             \
1629   product(bool, CMSOldPLABResizeQuicker, false,                             \
1630           "React on-the-fly during a scavenge to a sudden "                 \
1631           "change in block demand rate")                                    \
1632                                                                             \
1633   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1634           "The tolerance of the phase-change detector for on-the-fly "      \
1635           "PLAB resizing during a scavenge")                                \
1636                                                                             \
1637   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1638           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1639           "during a scavenge")                                              \
1640                                                                             \
1641   product(bool, AlwaysPreTouch, false,                                      \
1642           "Force all freshly committed pages to be pre-touched")            \
1643                                                                             \
1644   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1645           "The maximum size of young gen chosen by default per GC worker "  \
1646           "thread available")                                               \
1647                                                                             \
1648   product(bool, CMSIncrementalMode, false,                                  \
1649           "Whether CMS GC should operate in \"incremental\" mode")          \
1650                                                                             \
1651   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1652           "Percentage (0-100) of CMS incremental mode duty cycle. If "      \
1653           "CMSIncrementalPacing is enabled, then this is just the initial " \
1654           "value.")                                                         \
1655                                                                             \
1656   product(bool, CMSIncrementalPacing, true,                                 \
1657           "Whether the CMS incremental mode duty cycle should be "          \
1658           "automatically adjusted")                                         \
1659                                                                             \
1660   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1661           "Minimum percentage (0-100) of the CMS incremental duty cycle "   \
1662           "used when CMSIncrementalPacing is enabled")                      \
1663                                                                             \
1664   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1665           "Percentage (0-100) used to add conservatism when computing the " \
1666           "duty cycle")                                                     \
1667                                                                             \
1668   product(uintx, CMSIncrementalOffset, 0,                                   \
1669           "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1670           "is shifted to the right within the period between young GCs")    \
1671                                                                             \
1672   product(uintx, CMSExpAvgFactor, 50,                                       \
1673           "Percentage (0-100) used to weigh the current sample when "       \
1674           "computing exponential averages for CMS statistics")              \
1675                                                                             \
1676   product(uintx, CMS_FLSWeight, 75,                                         \
1677           "Percentage (0-100) used to weigh the current sample when "       \
1678           "computing exponentially decaying averages for CMS FLS "          \
1679           "statistics")                                                     \
1680                                                                             \
1681   product(uintx, CMS_FLSPadding, 1,                                         \
1682           "The multiple of deviation from mean to use for buffering "       \
1683           "against volatility in free list demand")                         \
1684                                                                             \
1685   product(uintx, FLSCoalescePolicy, 2,                                      \
1686           "CMS: aggressiveness level for coalescing, increasing "           \
1687           "from 0 to 4")                                                    \
1688                                                                             \
1689   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1690           "CMS: larger free blocks are always available for coalescing")    \
1691                                                                             \
1692   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1693           "CMS: the smaller the percentage the greater the coalescing "     \
1694           "force")                                                          \
1695                                                                             \
1696   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1697           "CMS: the factor by which to inflate estimated demand of small "  \
1698           "block sizes to prevent coalescing with an adjoining block")      \
1699                                                                             \
1700   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1701           "CMS: the factor by which to inflate estimated demand of large "  \
1702           "block sizes to prevent coalescing with an adjoining block")      \
1703                                                                             \
1704   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1705           "CMS: the factor by which to inflate estimated demand of small "  \
1706           "block sizes to prevent splitting to supply demand for smaller "  \
1707           "blocks")                                                         \
1708                                                                             \
1709   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1710           "CMS: the factor by which to inflate estimated demand of large "  \
1711           "block sizes to prevent splitting to supply demand for smaller "  \
1712           "blocks")                                                         \
1713                                                                             \
1714   product(bool, CMSExtrapolateSweep, false,                                 \
1715           "CMS: cushion for block demand during sweep")                     \
1716                                                                             \
1717   product(uintx, CMS_SweepWeight, 75,                                       \
1718           "Percentage (0-100) used to weight the current sample when "      \
1719           "computing exponentially decaying average for inter-sweep "       \
1720           "duration")                                                       \
1721                                                                             \
1722   product(uintx, CMS_SweepPadding, 1,                                       \
1723           "The multiple of deviation from mean to use for buffering "       \
1724           "against volatility in inter-sweep duration")                     \
1725                                                                             \
1726   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1727           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1728           "duration exceeds this threshold in milliseconds")                \
1729                                                                             \
1730   develop(bool, CMSTraceIncrementalMode, false,                             \
1731           "Trace CMS incremental mode")                                     \
1732                                                                             \
1733   develop(bool, CMSTraceIncrementalPacing, false,                           \
1734           "Trace CMS incremental mode pacing computation")                  \
1735                                                                             \
1736   develop(bool, CMSTraceThreadState, false,                                 \
1737           "Trace the CMS thread state (enable the trace_state() method)")   \
1738                                                                             \
1739   product(bool, CMSClassUnloadingEnabled, true,                             \
1740           "Whether class unloading enabled when using CMS GC")              \
1741                                                                             \
1742   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1743           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1744           "count for which classes may not be unloaded")                    \
1745                                                                             \
1746   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1747           "Compact when asked to collect CMS gen with "                     \
1748           "clear_all_soft_refs()")                                          \
1749                                                                             \
1750   product(bool, UseCMSCompactAtFullCollection, true,                        \
1751           "Use Mark-Sweep-Compact algorithm at full collections")           \
1752                                                                             \
1753   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1754           "Number of CMS full collection done before compaction if > 0")    \
1755                                                                             \
1756   develop(intx, CMSDictionaryChoice, 0,                                     \
1757           "Use BinaryTreeDictionary as default in the CMS generation")      \
1758                                                                             \
1759   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1760           "Replenish an indexed free list with this number of chunks")      \
1761                                                                             \
1762   product(bool, CMSReplenishIntermediate, true,                             \
1763           "Replenish all intermediate free-list caches")                    \
1764                                                                             \
1765   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1766           "When satisfying batched demand, split blocks from the "          \
1767           "IndexedFreeList whose size is a multiple of requested size")     \
1768                                                                             \
1769   product(bool, CMSLoopWarn, false,                                         \
1770           "Warn in case of excessive CMS looping")                          \
1771                                                                             \
1772   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1773           "Restore preserved marks early")                                  \
1774                                                                             \
1775   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1776           "Size of marking stack")                                          \
1777                                                                             \
1778   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1779           "Maximum size of marking stack")                                  \
1780                                                                             \
1781   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1782           "Simulate frequent marking stack / work queue overflow")          \
1783                                                                             \
1784   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1785           "An \"interval\" counter that determines how frequently "         \
1786           "to simulate overflow; a smaller number increases frequency")     \
1787                                                                             \
1788   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1789           "(Temporary, subject to experimentation) "                        \
1790           "Maximum number of abortable preclean iterations, if > 0")        \
1791                                                                             \
1792   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1793           "(Temporary, subject to experimentation) "                        \
1794           "Maximum time in abortable preclean (in milliseconds)")           \
1795                                                                             \
1796   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1797           "(Temporary, subject to experimentation) "                        \
1798           "Nominal minimum work per abortable preclean iteration")          \
1799                                                                             \
1800   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1801           "(Temporary, subject to experimentation) "                        \
1802           "Time that we sleep between iterations when not given "           \
1803           "enough work per iteration")                                      \
1804                                                                             \
1805   product(uintx, CMSRescanMultiple, 32,                                     \
1806           "Size (in cards) of CMS parallel rescan task")                    \
1807                                                                             \
1808   product(uintx, CMSConcMarkMultiple, 32,                                   \
1809           "Size (in cards) of CMS concurrent MT marking task")              \
1810                                                                             \
1811   product(bool, CMSAbortSemantics, false,                                   \
1812           "Whether abort-on-overflow semantics is implemented")             \
1813                                                                             \
1814   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1815           "Use the parallel initial mark.")                                 \
1816                                                                             \
1817   product(bool, CMSParallelRemarkEnabled, true,                             \
1818           "Whether parallel remark enabled (only if ParNewGC)")             \
1819                                                                             \
1820   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1821           "Whether parallel remark of survivor space "                      \
1822           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1823                                                                             \
1824   product(bool, CMSPLABRecordAlways, true,                                  \
1825           "Always record survivor space PLAB boundaries (effective only "   \
1826           "if CMSParallelSurvivorRemarkEnabled)")                           \
1827                                                                             \
1828   product(bool, CMSEdenChunksRecordAlways, true,                            \
1829           "Always record eden chunks used for the parallel initial mark "   \
1830           "or remark of eden")                                              \
1831                                                                             \
1832   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1833           "Print the eden and the survivor chunks used for the parallel "   \
1834           "initial mark or remark of the eden/survivor spaces")             \
1835                                                                             \
1836   product(bool, CMSConcurrentMTEnabled, true,                               \
1837           "Whether multi-threaded concurrent work enabled "                 \
1838           "(effective only if ParNewGC)")                                   \
1839                                                                             \
1840   product(bool, CMSPrecleaningEnabled, true,                                \
1841           "Whether concurrent precleaning enabled")                         \
1842                                                                             \
1843   product(uintx, CMSPrecleanIter, 3,                                        \
1844           "Maximum number of precleaning iteration passes")                 \
1845                                                                             \
1846   product(uintx, CMSPrecleanNumerator, 2,                                   \
1847           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1848           "ratio")                                                          \
1849                                                                             \
1850   product(uintx, CMSPrecleanDenominator, 3,                                 \
1851           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1852           "ratio")                                                          \
1853                                                                             \
1854   product(bool, CMSPrecleanRefLists1, true,                                 \
1855           "Preclean ref lists during (initial) preclean phase")             \
1856                                                                             \
1857   product(bool, CMSPrecleanRefLists2, false,                                \
1858           "Preclean ref lists during abortable preclean phase")             \
1859                                                                             \
1860   product(bool, CMSPrecleanSurvivors1, false,                               \
1861           "Preclean survivors during (initial) preclean phase")             \
1862                                                                             \
1863   product(bool, CMSPrecleanSurvivors2, true,                                \
1864           "Preclean survivors during abortable preclean phase")             \
1865                                                                             \
1866   product(uintx, CMSPrecleanThreshold, 1000,                                \
1867           "Do not iterate again if number of dirty cards is less than this")\
1868                                                                             \
1869   product(bool, CMSCleanOnEnter, true,                                      \
1870           "Clean-on-enter optimization for reducing number of dirty cards") \
1871                                                                             \
1872   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1873           "Choose variant (1,2) of verification following remark")          \
1874                                                                             \
1875   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1876           "If Eden size is below this, do not try to schedule remark")      \
1877                                                                             \
1878   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1879           "The Eden occupancy percentage (0-100) at which "                 \
1880           "to try and schedule remark pause")                               \
1881                                                                             \
1882   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1883           "Start sampling eden top at least before young gen "              \
1884           "occupancy reaches 1/<ratio> of the size at which "               \
1885           "we plan to schedule remark")                                     \
1886                                                                             \
1887   product(uintx, CMSSamplingGrain, 16*K,                                    \
1888           "The minimum distance between eden samples for CMS (see above)")  \
1889                                                                             \
1890   product(bool, CMSScavengeBeforeRemark, false,                             \
1891           "Attempt scavenge before the CMS remark step")                    \
1892                                                                             \
1893   develop(bool, CMSTraceSweeper, false,                                     \
1894           "Trace some actions of the CMS sweeper")                          \
1895                                                                             \
1896   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1897           "Don't drain below this size per parallel worker/thief")          \
1898                                                                             \
1899   manageable(intx, CMSWaitDuration, 2000,                                   \
1900           "Time in milliseconds that CMS thread waits for young GC")        \
1901                                                                             \
1902   develop(uintx, CMSCheckInterval, 1000,                                    \
1903           "Interval in milliseconds that CMS thread checks if it "          \
1904           "should start a collection cycle")                                \
1905                                                                             \
1906   product(bool, CMSYield, true,                                             \
1907           "Yield between steps of CMS")                                     \
1908                                                                             \
1909   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1910           "Bitmap operations should process at most this many bits "        \
1911           "between yields")                                                 \
1912                                                                             \
1913   product(bool, CMSDumpAtPromotionFailure, false,                           \
1914           "Dump useful information about the state of the CMS old "         \
1915           "generation upon a promotion failure")                            \
1916                                                                             \
1917   product(bool, CMSPrintChunksInDump, false,                                \
1918           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1919           "more detailed information about the free chunks")                \
1920                                                                             \
1921   product(bool, CMSPrintObjectsInDump, false,                               \
1922           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1923           "more detailed information about the allocated objects")          \
1924                                                                             \
1925   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1926           "Verify that all references across the FLS boundary "             \
1927           "are to valid objects")                                           \
1928                                                                             \
1929   diagnostic(bool, FLSVerifyLists, false,                                   \
1930           "Do lots of (expensive) FreeListSpace verification")              \
1931                                                                             \
1932   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1933           "Do lots of (expensive) FLS index table verification")            \
1934                                                                             \
1935   develop(bool, FLSVerifyDictionary, false,                                 \
1936           "Do lots of (expensive) FLS dictionary verification")             \
1937                                                                             \
1938   develop(bool, VerifyBlockOffsetArray, false,                              \
1939           "Do (expensive) block offset array verification")                 \
1940                                                                             \
1941   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1942           "Maintain _unallocated_block in BlockOffsetArray "                \
1943           "(currently applicable only to CMS collector)")                   \
1944                                                                             \
1945   develop(bool, TraceCMSState, false,                                       \
1946           "Trace the state of the CMS collection")                          \
1947                                                                             \
1948   product(intx, RefDiscoveryPolicy, 0,                                      \
1949           "Select type of reference discovery policy: "                     \
1950           "reference-based(0) or referent-based(1)")                        \
1951                                                                             \
1952   product(bool, ParallelRefProcEnabled, false,                              \
1953           "Enable parallel reference processing whenever possible")         \
1954                                                                             \
1955   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1956           "Enable balancing of reference processing queues")                \
1957                                                                             \
1958   product(uintx, CMSTriggerRatio, 80,                                       \
1959           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1960           "allocated before a CMS collection cycle commences")              \
1961                                                                             \
1962   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1963           "Percentage CMS generation occupancy at which to "                \
1964           "initiate CMS collection for bootstrapping collection stats")     \
1965                                                                             \
1966   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1967           "Percentage CMS generation occupancy to start a CMS collection "  \
1968           "cycle. A negative value means that CMSTriggerRatio is used")     \
1969                                                                             \
1970   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1971           "Percentage of the (entire) heap occupancy to start a "           \
1972           "concurrent GC cycle. It is used by GCs that trigger a "          \
1973           "concurrent GC cycle based on the occupancy of the entire heap, " \
1974           "not just one of the generations (e.g., G1). A value of 0 "       \
1975           "denotes 'do constant GC cycles'.")                               \
1976                                                                             \
1977   manageable(intx, CMSTriggerInterval, -1,                                  \
1978           "Commence a CMS collection cycle (at least) every so many "       \
1979           "milliseconds (0 permanently, -1 disabled)")                      \
1980                                                                             \
1981   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1982           "Only use occupancy as a criterion for starting a CMS collection")\
1983                                                                             \
1984   product(uintx, CMSIsTooFullPercentage, 98,                                \
1985           "An absolute ceiling above which CMS will always consider the "   \
1986           "unloading of classes when class unloading is enabled")           \
1987                                                                             \
1988   develop(bool, CMSTestInFreeList, false,                                   \
1989           "Check if the coalesced range is already in the "                 \
1990           "free lists as claimed")                                          \
1991                                                                             \
1992   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1993           "Check that all the garbage collected was returned to the "       \
1994           "free lists")                                                     \
1995                                                                             \
1996   notproduct(bool, ScavengeALot, false,                                     \
1997           "Force scavenge at every Nth exit from the runtime system "       \
1998           "(N=ScavengeALotInterval)")                                       \
1999                                                                             \
2000   develop(bool, FullGCALot, false,                                          \
2001           "Force full gc at every Nth exit from the runtime system "        \
2002           "(N=FullGCALotInterval)")                                         \
2003                                                                             \
2004   notproduct(bool, GCALotAtAllSafepoints, false,                            \
2005           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
2006                                                                             \
2007   product(bool, PrintPromotionFailure, false,                               \
2008           "Print additional diagnostic information following "              \
2009           "promotion failure")                                              \
2010                                                                             \
2011   notproduct(bool, PromotionFailureALot, false,                             \
2012           "Use promotion failure handling on every youngest generation "    \
2013           "collection")                                                     \
2014                                                                             \
2015   develop(uintx, PromotionFailureALotCount, 1000,                           \
2016           "Number of promotion failures occurring at ParGCAllocBuffer "     \
2017           "refill attempts (ParNew) or promotion attempts "                 \
2018           "(other young collectors)")                                       \
2019                                                                             \
2020   develop(uintx, PromotionFailureALotInterval, 5,                           \
2021           "Total collections between promotion failures alot")              \
2022                                                                             \
2023   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2024           "Sleep time when sleep is used for yields")                       \
2025                                                                             \
2026   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2027           "Number of yields before a sleep is done during workstealing")    \
2028                                                                             \
2029   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2030           "Number of iterations in a spin loop between checks on "          \
2031           "time out of hard spin")                                          \
2032                                                                             \
2033   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2034           "Ratio of hard spins to calls to yield")                          \
2035                                                                             \
2036   develop(uintx, ObjArrayMarkingStride, 512,                                \
2037           "Number of object array elements to push onto the marking stack " \
2038           "before pushing a continuation entry")                            \
2039                                                                             \
2040   develop(bool, MetadataAllocationFailALot, false,                          \
2041           "Fail metadata allocations at intervals controlled by "           \
2042           "MetadataAllocationFailALotInterval")                             \
2043                                                                             \
2044   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2045           "Metadata allocation failure a lot interval")                     \
2046                                                                             \
2047   develop(bool, TraceMetadataChunkAllocation, false,                        \
2048           "Trace chunk metadata allocations")                               \
2049                                                                             \
2050   product(bool, TraceMetadataHumongousAllocation, false,                    \
2051           "Trace humongous metadata allocations")                           \
2052                                                                             \
2053   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2054           "Trace virtual space metadata allocations")                       \
2055                                                                             \
2056   notproduct(bool, ExecuteInternalVMTests, false,                           \
2057           "Enable execution of internal VM tests")                          \
2058                                                                             \
2059   notproduct(bool, VerboseInternalVMTests, false,                           \
2060           "Turn on logging for internal VM tests.")                         \
2061                                                                             \
2062   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2063                                                                             \
2064   product_pd(bool, ResizeTLAB,                                              \
2065           "Dynamically resize TLAB size for threads")                       \
2066                                                                             \
2067   product(bool, ZeroTLAB, false,                                            \
2068           "Zero out the newly created TLAB")                                \
2069                                                                             \
2070   product(bool, FastTLABRefill, true,                                       \
2071           "Use fast TLAB refill code")                                      \
2072                                                                             \
2073   product(bool, PrintTLAB, false,                                           \
2074           "Print various TLAB related information")                         \
2075                                                                             \
2076   product(bool, TLABStats, true,                                            \
2077           "Provide more detailed and expensive TLAB statistics "            \
2078           "(with PrintTLAB)")                                               \
2079                                                                             \
2080   product_pd(bool, NeverActAsServerClassMachine,                            \
2081           "Never act like a server-class machine")                          \
2082                                                                             \
2083   product(bool, AlwaysActAsServerClassMachine, false,                       \
2084           "Always act like a server-class machine")                         \
2085                                                                             \
2086   product_pd(uint64_t, MaxRAM,                                              \
2087           "Real memory size (in bytes) used to set maximum heap size")      \
2088                                                                             \
2089   product(bool, AggressiveHeap, false,                                      \
2090           "Optimize heap options for long-running memory intensive apps")   \
2091                                                                             \
2092   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2093           "Maximum ergonomically set heap size (in bytes); zero means use " \
2094           "MaxRAM * MaxRAMPercentage / 100")                                \
2095                                                                             \
2096   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2097           "Use CGroup memory limit as physical memory limit for heap "      \
2098           "sizing"                                                          \
2099           "Deprecated, replaced by container support")                      \
2100                                                                             \
2101   diagnostic(bool, PrintContainerInfo, false,                               \
2102           "Print container related information")                            \
2103                                                                             \
2104   diagnostic(bool, PrintActiveCpus, false,                                  \
2105            "Print the number of CPUs detected in os::active_processor_count") \
2106                                                                             \
2107   product(uintx, MaxRAMFraction, 4,                                         \
2108           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2109           "size")                                                           \
2110                                                                             \
2111   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2112           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2113           "size; deprecated: to be renamed to MaxRAMFraction")              \
2114                                                                             \
2115   product(uintx, MinRAMFraction, 2,                                         \
2116           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2117           "size on systems with small physical memory size")                \
2118                                                                             \
2119   product(uintx, InitialRAMFraction, 64,                                    \
2120           "Fraction (1/n) of real memory used for initial heap size")       \
2121                                                                             \
2122   product(double, MaxRAMPercentage, 25.0,                                   \
2123           "Maximum percentage of real memory used for maximum heap size")   \
2124                                                                             \
2125   product(double, MinRAMPercentage, 50.0,                                   \
2126           "Minimum percentage of real memory used for maximum heap"         \
2127           "size on systems with small physical memory size")                \
2128                                                                             \
2129   product(double, InitialRAMPercentage, 1.5625,                             \
2130           "Percentage of real memory used for initial heap size")           \
2131                                                                             \
2132   product(intx, ActiveProcessorCount, -1,                                   \
2133           "Specify the CPU count the VM should use and report as active")   \
2134                                                                             \
2135   develop(uintx, MaxVirtMemFraction, 2,                                     \
2136           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2137           "determining maximum heap size")                                  \
2138                                                                             \
2139   product(bool, UseAutoGCSelectPolicy, false,                               \
2140           "Use automatic collection selection policy")                      \
2141                                                                             \
2142   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2143           "Automatic GC selection pause threshold in milliseconds")         \
2144                                                                             \
2145   product(bool, UseAdaptiveSizePolicy, true,                                \
2146           "Use adaptive generation sizing policies")                        \
2147                                                                             \
2148   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2149           "Use adaptive survivor sizing policies")                          \
2150                                                                             \
2151   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2152           "Use adaptive young-old sizing policies at minor collections")    \
2153                                                                             \
2154   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2155           "Use adaptive young-old sizing policies at major collections")    \
2156                                                                             \
2157   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2158           "Include statistics from System.gc() for adaptive size policy")   \
2159                                                                             \
2160   product(bool, UseAdaptiveGCBoundary, false,                               \
2161           "Allow young-old boundary to move")                               \
2162                                                                             \
2163   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2164           "Trace young-old boundary moves")                                 \
2165                                                                             \
2166   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2167           "Resize the virtual spaces of the young or old generations")      \
2168                                                                             \
2169   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2170           "Policy for changing generation size for throughput goals")       \
2171                                                                             \
2172   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2173           "Policy for changing generation size for pause goals")            \
2174                                                                             \
2175   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2176           "Adjust tenured generation to achieve a minor pause goal")        \
2177                                                                             \
2178   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2179           "Adjust young generation to achieve a major pause goal")          \
2180                                                                             \
2181   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2182           "Number of steps where heuristics is used before data is used")   \
2183                                                                             \
2184   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2185           "Number of collections before the adaptive sizing is started")    \
2186                                                                             \
2187   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2188           "Collection interval for printing information; zero means never") \
2189                                                                             \
2190   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2191           "Use adaptive minimum footprint as a goal")                       \
2192                                                                             \
2193   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2194           "Weight given to exponential resizing, between 0 and 100")        \
2195                                                                             \
2196   product(uintx, AdaptiveTimeWeight,       25,                              \
2197           "Weight given to time in adaptive policy, between 0 and 100")     \
2198                                                                             \
2199   product(uintx, PausePadding, 1,                                           \
2200           "How much buffer to keep for pause time")                         \
2201                                                                             \
2202   product(uintx, PromotedPadding, 3,                                        \
2203           "How much buffer to keep for promotion failure")                  \
2204                                                                             \
2205   product(uintx, SurvivorPadding, 3,                                        \
2206           "How much buffer to keep for survivor overflow")                  \
2207                                                                             \
2208   product(uintx, ThresholdTolerance, 10,                                    \
2209           "Allowed collection cost difference between generations")         \
2210                                                                             \
2211   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2212           "If collection costs are within margin, reduce both by full "     \
2213           "delta")                                                          \
2214                                                                             \
2215   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2216           "Adaptive size percentage change in young generation")            \
2217                                                                             \
2218   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2219           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2220                                                                             \
2221   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2222           "Decay factor to YoungedGenerationSizeSupplement")                \
2223                                                                             \
2224   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2225           "Adaptive size percentage change in tenured generation")          \
2226                                                                             \
2227   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2228           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2229                                                                             \
2230   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2231           "Decay factor to TenuredGenerationSizeIncrement")                 \
2232                                                                             \
2233   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2234           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2235           "or (G1 Only) the maximum GC time per MMU time slice")            \
2236                                                                             \
2237   product(uintx, GCPauseIntervalMillis, 0,                                  \
2238           "Time slice for MMU specification")                               \
2239                                                                             \
2240   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2241           "Adaptive size policy maximum GC minor pause time goal "          \
2242           "in millisecond")                                                 \
2243                                                                             \
2244   product(uintx, GCTimeRatio, 99,                                           \
2245           "Adaptive size policy application time to GC time ratio")         \
2246                                                                             \
2247   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2248           "Adaptive size scale down factor for shrinking")                  \
2249                                                                             \
2250   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2251           "Adaptive size decays the major cost for long major intervals")   \
2252                                                                             \
2253   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2254           "Time scale over which major costs decay")                        \
2255                                                                             \
2256   product(uintx, MinSurvivorRatio, 3,                                       \
2257           "Minimum ratio of young generation/survivor space size")          \
2258                                                                             \
2259   product(uintx, InitialSurvivorRatio, 8,                                   \
2260           "Initial ratio of young generation/survivor space size")          \
2261                                                                             \
2262   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2263           "Estimate of footprint other than Java Heap")                     \
2264                                                                             \
2265   product(bool, UseGCOverheadLimit, true,                                   \
2266           "Use policy to limit of proportion of time spent in GC "          \
2267           "before an OutOfMemory error is thrown")                          \
2268                                                                             \
2269   product(uintx, GCTimeLimit, 98,                                           \
2270           "Limit of the proportion of time spent in GC before "             \
2271           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2272                                                                             \
2273   product(uintx, GCHeapFreeLimit, 2,                                        \
2274           "Minimum percentage of free space after a full GC before an "     \
2275           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2276                                                                             \
2277   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2278           "Number of consecutive collections before gc time limit fires")   \
2279                                                                             \
2280   product(bool, PrintAdaptiveSizePolicy, false,                             \
2281           "Print information about AdaptiveSizePolicy")                     \
2282                                                                             \
2283   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2284           "How far ahead to prefetch destination area (<= 0 means off)")    \
2285                                                                             \
2286   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2287           "How far ahead to prefetch scan area (<= 0 means off)")           \
2288                                                                             \
2289   product(intx, PrefetchFieldsAhead, -1,                                    \
2290           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2291                                                                             \
2292   diagnostic(bool, VerifySilently, false,                                   \
2293           "Do not print the verification progress")                         \
2294                                                                             \
2295   diagnostic(bool, VerifyDuringStartup, false,                              \
2296           "Verify memory system before executing any Java code "            \
2297           "during VM initialization")                                       \
2298                                                                             \
2299   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2300           "Verify system before exiting")                                   \
2301                                                                             \
2302   diagnostic(bool, VerifyBeforeGC, false,                                   \
2303           "Verify memory system before GC")                                 \
2304                                                                             \
2305   diagnostic(bool, VerifyAfterGC, false,                                    \
2306           "Verify memory system after GC")                                  \
2307                                                                             \
2308   diagnostic(bool, VerifyDuringGC, false,                                   \
2309           "Verify memory system during GC (between phases)")                \
2310                                                                             \
2311   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2312           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2313           "are enabled. One or more sub-systems can be specified "          \
2314           "in a comma separated string. Sub-systems are: "                  \
2315           "threads, heap, symbol_table, string_table, codecache, "          \
2316           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2317           "c-heap, codecache_oops")                                         \
2318                                                                             \
2319   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2320           "Enable parallel memory system verification")                     \
2321                                                                             \
2322   diagnostic(bool, DeferInitialCardMark, false,                             \
2323           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2324           "may arise from new_pre_store_barrier")                           \
2325                                                                             \
2326   diagnostic(bool, VerifyRememberedSets, false,                             \
2327           "Verify GC remembered sets")                                      \
2328                                                                             \
2329   diagnostic(bool, VerifyObjectStartArray, true,                            \
2330           "Verify GC object start array if verify before/after")            \
2331                                                                             \
2332   product(bool, DisableExplicitGC, false,                                   \
2333           "Ignore calls to System.gc()")                                    \
2334                                                                             \
2335   notproduct(bool, CheckMemoryInitialization, false,                        \
2336           "Check memory initialization")                                    \
2337                                                                             \
2338   product(bool, CollectGen0First, false,                                    \
2339           "Collect youngest generation before each full GC")                \
2340                                                                             \
2341   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2342           "Bind CMS Thread to CPU if possible")                             \
2343                                                                             \
2344   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2345           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2346                                                                             \
2347   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2348           "Bind GCTaskThreads to CPUs if possible")                         \
2349                                                                             \
2350   product(bool, UseGCTaskAffinity, false,                                   \
2351           "Use worker affinity when asking for GCTasks")                    \
2352                                                                             \
2353   product(uintx, ProcessDistributionStride, 4,                              \
2354           "Stride through processors when distributing processes")          \
2355                                                                             \
2356   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2357           "Number of times the coordinator GC thread will sleep while "     \
2358           "yielding before giving up and resuming GC")                      \
2359                                                                             \
2360   product(uintx, CMSYieldSleepCount, 0,                                     \
2361           "Number of times a GC thread (minus the coordinator) "            \
2362           "will sleep while yielding before giving up and resuming GC")     \
2363                                                                             \
2364   /* gc tracing */                                                          \
2365   manageable(bool, PrintGC, false,                                          \
2366           "Print message at garbage collection")                            \
2367                                                                             \
2368   manageable(bool, PrintGCDetails, false,                                   \
2369           "Print more details at garbage collection")                       \
2370                                                                             \
2371   manageable(bool, PrintGCDateStamps, false,                                \
2372           "Print date stamps at garbage collection")                        \
2373                                                                             \
2374   manageable(bool, PrintGCTimeStamps, false,                                \
2375           "Print timestamps at garbage collection")                         \
2376                                                                             \
2377   manageable(bool, PrintGCID, false,                                        \
2378           "Print an identifier for each garbage collection")                \
2379                                                                             \
2380   product(bool, PrintGCTaskTimeStamps, false,                               \
2381           "Print timestamps for individual gc worker thread tasks")         \
2382                                                                             \
2383   develop(intx, ConcGCYieldTimeout, 0,                                      \
2384           "If non-zero, assert that GC threads yield within this "          \
2385           "number of milliseconds")                                         \
2386                                                                             \
2387   notproduct(bool, TraceMarkSweep, false,                                   \
2388           "Trace mark sweep")                                               \
2389                                                                             \
2390   product(bool, PrintReferenceGC, false,                                    \
2391           "Print times spent handling reference objects during GC "         \
2392           "(enabled only when PrintGCDetails)")                             \
2393                                                                             \
2394   develop(bool, TraceReferenceGC, false,                                    \
2395           "Trace handling of soft/weak/final/phantom references")           \
2396                                                                             \
2397   develop(bool, TraceFinalizerRegistration, false,                          \
2398           "Trace registration of final references")                         \
2399                                                                             \
2400   notproduct(bool, TraceScavenge, false,                                    \
2401           "Trace scavenge")                                                 \
2402                                                                             \
2403   product(bool, IgnoreEmptyClassPaths, false,                               \
2404           "Ignore empty path elements in -classpath")                       \
2405                                                                             \
2406   product(bool, TraceClassPaths, false,                                     \
2407           "Trace processing of class paths")                                \
2408                                                                             \
2409   product_rw(bool, TraceClassLoading, false,                                \
2410           "Trace all classes loaded")                                       \
2411                                                                             \
2412   product(bool, TraceClassLoadingPreorder, false,                           \
2413           "Trace all classes loaded in order referenced (not loaded)")      \
2414                                                                             \
2415   product_rw(bool, TraceClassUnloading, false,                              \
2416           "Trace unloading of classes")                                     \
2417                                                                             \
2418   product_rw(bool, TraceLoaderConstraints, false,                           \
2419           "Trace loader constraints")                                       \
2420                                                                             \
2421   develop(bool, TraceClassLoaderData, false,                                \
2422           "Trace class loader loader_data lifetime")                        \
2423                                                                             \
2424   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2425           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2426           "Initial size of the boot class loader data metaspace")           \
2427                                                                             \
2428   product(bool, TraceGen0Time, false,                                       \
2429           "Trace accumulated time for Gen 0 collection")                    \
2430                                                                             \
2431   product(bool, TraceGen1Time, false,                                       \
2432           "Trace accumulated time for Gen 1 collection")                    \
2433                                                                             \
2434   product(bool, PrintTenuringDistribution, false,                           \
2435           "Print tenuring age information")                                 \
2436                                                                             \
2437   product_rw(bool, PrintHeapAtGC, false,                                    \
2438           "Print heap layout before and after each GC")                     \
2439                                                                             \
2440   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2441           "Print extended information about the layout of the heap "        \
2442           "when -XX:+PrintHeapAtGC is set")                                 \
2443                                                                             \
2444   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2445           "Print heap layout in response to SIGBREAK")                      \
2446                                                                             \
2447   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2448           "Print a class histogram before any major stop-world GC")         \
2449                                                                             \
2450   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2451           "Print a class histogram after any major stop-world GC")          \
2452                                                                             \
2453   manageable(bool, PrintClassHistogram, false,                              \
2454           "Print a histogram of class instances")                           \
2455                                                                             \
2456   develop(bool, TraceWorkGang, false,                                       \
2457           "Trace activities of work gangs")                                 \
2458                                                                             \
2459   product(bool, TraceParallelOldGCTasks, false,                             \
2460           "Trace multithreaded GC activity")                                \
2461                                                                             \
2462   develop(bool, TraceBlockOffsetTable, false,                               \
2463           "Print BlockOffsetTable maps")                                    \
2464                                                                             \
2465   develop(bool, TraceCardTableModRefBS, false,                              \
2466           "Print CardTableModRefBS maps")                                   \
2467                                                                             \
2468   develop(bool, TraceGCTaskManager, false,                                  \
2469           "Trace actions of the GC task manager")                           \
2470                                                                             \
2471   develop(bool, TraceGCTaskQueue, false,                                    \
2472           "Trace actions of the GC task queues")                            \
2473                                                                             \
2474   diagnostic(bool, TraceGCTaskThread, false,                                \
2475           "Trace actions of the GC task threads")                           \
2476                                                                             \
2477   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2478           "Print the time taken by each phase in ParallelOldGC "            \
2479           "(PrintGCDetails must also be enabled)")                          \
2480                                                                             \
2481   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2482           "Trace marking phase in ParallelOldGC")                           \
2483                                                                             \
2484   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2485           "Trace summary phase in ParallelOldGC")                           \
2486                                                                             \
2487   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2488           "Trace compaction phase in ParallelOldGC")                        \
2489                                                                             \
2490   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2491           "Trace dense prefix computation for ParallelOldGC")               \
2492                                                                             \
2493   develop(bool, IgnoreLibthreadGPFault, false,                              \
2494           "Suppress workaround for libthread GP fault")                     \
2495                                                                             \
2496   product(bool, PrintJNIGCStalls, false,                                    \
2497           "Print diagnostic message when GC is stalled "                    \
2498           "by JNI critical section")                                        \
2499                                                                             \
2500   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2501           "The percentage of the used heap that the instances of a class "  \
2502           "must occupy for the class to generate a trace event")            \
2503                                                                             \
2504   /* GC log rotation setting */                                             \
2505                                                                             \
2506   product(bool, UseGCLogFileRotation, false,                                \
2507           "Rotate gclog files (for long running applications). It requires "\
2508           "-Xloggc:<filename>")                                             \
2509                                                                             \
2510   product(uintx, NumberOfGCLogFiles, 0,                                     \
2511           "Number of gclog files in rotation "                              \
2512           "(default: 0, no rotation)")                                      \
2513                                                                             \
2514   product(uintx, GCLogFileSize, 8*K,                                        \
2515           "GC log file size, requires UseGCLogFileRotation. "               \
2516           "Set to 0 to only trigger rotation via jcmd")                     \
2517                                                                             \
2518   /* JVMTI heap profiling */                                                \
2519                                                                             \
2520   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2521           "Trace JVMTI object tagging calls")                               \
2522                                                                             \
2523   diagnostic(bool, VerifyBeforeIteration, false,                            \
2524           "Verify memory system before JVMTI iteration")                    \
2525                                                                             \
2526   /* compiler interface */                                                  \
2527                                                                             \
2528   develop(bool, CIPrintCompilerName, false,                                 \
2529           "when CIPrint is active, print the name of the active compiler")  \
2530                                                                             \
2531   develop(bool, CIPrintCompileQueue, false,                                 \
2532           "display the contents of the compile queue whenever a "           \
2533           "compilation is enqueued")                                        \
2534                                                                             \
2535   develop(bool, CIPrintRequests, false,                                     \
2536           "display every request for compilation")                          \
2537                                                                             \
2538   product(bool, CITime, false,                                              \
2539           "collect timing information for compilation")                     \
2540                                                                             \
2541   develop(bool, CITimeEach, false,                                          \
2542           "display timing information after each successful compilation")   \
2543                                                                             \
2544   develop(bool, CICountOSR, false,                                          \
2545           "use a separate counter when assigning ids to osr compilations")  \
2546                                                                             \
2547   develop(bool, CICompileNatives, true,                                     \
2548           "compile native methods if supported by the compiler")            \
2549                                                                             \
2550   develop_pd(bool, CICompileOSR,                                            \
2551           "compile on stack replacement methods if supported by the "       \
2552           "compiler")                                                       \
2553                                                                             \
2554   develop(bool, CIPrintMethodCodes, false,                                  \
2555           "print method bytecodes of the compiled code")                    \
2556                                                                             \
2557   develop(bool, CIPrintTypeFlow, false,                                     \
2558           "print the results of ciTypeFlow analysis")                       \
2559                                                                             \
2560   develop(bool, CITraceTypeFlow, false,                                     \
2561           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2562                                                                             \
2563   develop(intx, OSROnlyBCI, -1,                                             \
2564           "OSR only at this bci.  Negative values mean exclude that bci")   \
2565                                                                             \
2566   /* compiler */                                                            \
2567                                                                             \
2568   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2569           "Number of compiler threads to run")                              \
2570                                                                             \
2571   product(intx, CompilationPolicyChoice, 0,                                 \
2572           "which compilation policy (0/1)")                                 \
2573                                                                             \
2574   develop(bool, UseStackBanging, true,                                      \
2575           "use stack banging for stack overflow checks (required for "      \
2576           "proper StackOverflow handling; disable only to measure cost "    \
2577           "of stackbanging)")                                               \
2578                                                                             \
2579   develop(bool, UseStrictFP, true,                                          \
2580           "use strict fp if modifier strictfp is set")                      \
2581                                                                             \
2582   develop(bool, GenerateSynchronizationCode, true,                          \
2583           "generate locking/unlocking code for synchronized methods and "   \
2584           "monitors")                                                       \
2585                                                                             \
2586   develop(bool, GenerateCompilerNullChecks, true,                           \
2587           "Generate explicit null checks for loads/stores/calls")           \
2588                                                                             \
2589   develop(bool, GenerateRangeChecks, true,                                  \
2590           "Generate range checks for array accesses")                       \
2591                                                                             \
2592   develop_pd(bool, ImplicitNullChecks,                                      \
2593           "Generate code for implicit null checks")                         \
2594                                                                             \
2595   product_pd(bool, TrapBasedNullChecks,                                     \
2596           "Generate code for null checks that uses a cmp and trap "         \
2597           "instruction raising SIGTRAP.  This is only used if an access to" \
2598           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2599           "ImplicitNullChecks don't work (PPC64).")                         \
2600                                                                             \
2601   product(bool, PrintSafepointStatistics, false,                            \
2602           "Print statistics about safepoint synchronization")               \
2603                                                                             \
2604   product(intx, PrintSafepointStatisticsCount, 300,                         \
2605           "Total number of safepoint statistics collected "                 \
2606           "before printing them out")                                       \
2607                                                                             \
2608   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2609           "Print safepoint statistics only when safepoint takes "           \
2610           "more than PrintSafepointSatisticsTimeout in millis")             \
2611                                                                             \
2612   product(bool, TraceSafepointCleanupTime, false,                           \
2613           "Print the break down of clean up tasks performed during "        \
2614           "safepoint")                                                      \
2615                                                                             \
2616   product(bool, Inline, true,                                               \
2617           "Enable inlining")                                                \
2618                                                                             \
2619   product(bool, ClipInlining, true,                                         \
2620           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2621                                                                             \
2622   develop(bool, UseCHA, true,                                               \
2623           "Enable CHA")                                                     \
2624                                                                             \
2625   product(bool, UseTypeProfile, true,                                       \
2626           "Check interpreter profile for historically monomorphic calls")   \
2627                                                                             \
2628   notproduct(bool, TimeCompiler, false,                                     \
2629           "Time the compiler")                                              \
2630                                                                             \
2631   diagnostic(bool, PrintInlining, false,                                    \
2632           "Print inlining optimizations")                                   \
2633                                                                             \
2634   product(bool, UsePopCountInstruction, false,                              \
2635           "Use population count instruction")                               \
2636                                                                             \
2637   develop(bool, EagerInitialization, false,                                 \
2638           "Eagerly initialize classes if possible")                         \
2639                                                                             \
2640   develop(bool, TraceMethodReplacement, false,                              \
2641           "Print when methods are replaced do to recompilation")            \
2642                                                                             \
2643   develop(bool, PrintMethodFlushing, false,                                 \
2644           "Print the nmethods being flushed")                               \
2645                                                                             \
2646   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2647           "print statistics about method flushing")                         \
2648                                                                             \
2649   develop(bool, UseRelocIndex, false,                                       \
2650           "Use an index to speed random access to relocations")             \
2651                                                                             \
2652   develop(bool, StressCodeBuffers, false,                                   \
2653           "Exercise code buffer expansion and other rare state changes")    \
2654                                                                             \
2655   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2656           "Generate extra debugging information for non-safepoints in "     \
2657           "nmethods")                                                       \
2658                                                                             \
2659   product(bool, PrintVMOptions, false,                                      \
2660           "Print flags that appeared on the command line")                  \
2661                                                                             \
2662   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2663           "Ignore unrecognized VM options")                                 \
2664                                                                             \
2665   product(bool, PrintCommandLineFlags, false,                               \
2666           "Print flags specified on command line or set by ergonomics")     \
2667                                                                             \
2668   product(bool, PrintFlagsInitial, false,                                   \
2669           "Print all VM flags before argument processing and exit VM")      \
2670                                                                             \
2671   product(bool, PrintFlagsFinal, false,                                     \
2672           "Print all VM flags after argument and ergonomic processing")     \
2673                                                                             \
2674   notproduct(bool, PrintFlagsWithComments, false,                           \
2675           "Print all VM flags with default values and descriptions and "    \
2676           "exit")                                                           \
2677                                                                             \
2678   diagnostic(bool, SerializeVMOutput, true,                                 \
2679           "Use a mutex to serialize output to tty and LogFile")             \
2680                                                                             \
2681   diagnostic(bool, DisplayVMOutput, true,                                   \
2682           "Display all VM output on the tty, independently of LogVMOutput") \
2683                                                                             \
2684   diagnostic(bool, LogVMOutput, false,                                      \
2685           "Save VM output to LogFile")                                      \
2686                                                                             \
2687   diagnostic(ccstr, LogFile, NULL,                                          \
2688           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2689           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2690                                                                             \
2691   product(ccstr, ErrorFile, NULL,                                           \
2692           "If an error occurs, save the error data to this file "           \
2693           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2694                                                                             \
2695   product(bool, DisplayVMOutputToStderr, false,                             \
2696           "If DisplayVMOutput is true, display all VM output to stderr")    \
2697                                                                             \
2698   product(bool, DisplayVMOutputToStdout, false,                             \
2699           "If DisplayVMOutput is true, display all VM output to stdout")    \
2700                                                                             \
2701   product(bool, UseHeavyMonitors, false,                                    \
2702           "use heavyweight instead of lightweight Java monitors")           \
2703                                                                             \
2704   product(bool, PrintStringTableStatistics, false,                          \
2705           "print statistics about the StringTable and SymbolTable")         \
2706                                                                             \
2707   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2708           "verify StringTable contents at exit")                            \
2709                                                                             \
2710   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2711           "print histogram of the symbol table")                            \
2712                                                                             \
2713   notproduct(bool, ExitVMOnVerifyError, false,                              \
2714           "standard exit from VM if bytecode verify error "                 \
2715           "(only in debug mode)")                                           \
2716                                                                             \
2717   notproduct(ccstr, AbortVMOnException, NULL,                               \
2718           "Call fatal if this exception is thrown.  Example: "              \
2719           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2720                                                                             \
2721   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2722           "Call fatal if the exception pointed by AbortVMOnException "      \
2723           "has this message")                                               \
2724                                                                             \
2725   develop(bool, DebugVtables, false,                                        \
2726           "add debugging code to vtable dispatch")                          \
2727                                                                             \
2728   develop(bool, PrintVtables, false,                                        \
2729           "print vtables when printing klass")                              \
2730                                                                             \
2731   notproduct(bool, PrintVtableStats, false,                                 \
2732           "print vtables stats at end of run")                              \
2733                                                                             \
2734   develop(bool, TraceCreateZombies, false,                                  \
2735           "trace creation of zombie nmethods")                              \
2736                                                                             \
2737   notproduct(bool, IgnoreLockingAssertions, false,                          \
2738           "disable locking assertions (for speed)")                         \
2739                                                                             \
2740   product(bool, RangeCheckElimination, true,                                \
2741           "Eliminate range checks")                                         \
2742                                                                             \
2743   develop_pd(bool, UncommonNullCast,                                        \
2744           "track occurrences of null in casts; adjust compiler tactics")    \
2745                                                                             \
2746   develop(bool, TypeProfileCasts,  true,                                    \
2747           "treat casts like calls for purposes of type profiling")          \
2748                                                                             \
2749   develop(bool, DelayCompilationDuringStartup, true,                        \
2750           "Delay invoking the compiler until main application class is "    \
2751           "loaded")                                                         \
2752                                                                             \
2753   develop(bool, CompileTheWorld, false,                                     \
2754           "Compile all methods in all classes in bootstrap class path "     \
2755           "(stress test)")                                                  \
2756                                                                             \
2757   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2758           "Preload all classes used by a class before start loading")       \
2759                                                                             \
2760   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2761           "Force a safepoint every n compiles so sweeper can keep up")      \
2762                                                                             \
2763   develop(bool, FillDelaySlots, true,                                       \
2764           "Fill delay slots (on SPARC only)")                               \
2765                                                                             \
2766   develop(bool, TimeLivenessAnalysis, false,                                \
2767           "Time computation of bytecode liveness analysis")                 \
2768                                                                             \
2769   develop(bool, TraceLivenessGen, false,                                    \
2770           "Trace the generation of liveness analysis information")          \
2771                                                                             \
2772   notproduct(bool, TraceLivenessQuery, false,                               \
2773           "Trace queries of liveness analysis information")                 \
2774                                                                             \
2775   notproduct(bool, CollectIndexSetStatistics, false,                        \
2776           "Collect information about IndexSets")                            \
2777                                                                             \
2778   develop(bool, UseLoopSafepoints, true,                                    \
2779           "Generate Safepoint nodes in every loop")                         \
2780                                                                             \
2781   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2782           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2783           "Inline allocations larger than this in doublewords must go slow")\
2784                                                                             \
2785   product(bool, AggressiveOpts, false,                                      \
2786           "Enable aggressive optimizations - see arguments.cpp")            \
2787                                                                             \
2788   product_pd(uintx, TypeProfileLevel,                                       \
2789           "=XYZ, with Z: Type profiling of arguments at call; "             \
2790                      "Y: Type profiling of return value at call; "          \
2791                      "X: Type profiling of parameters to methods; "         \
2792           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2793                                                                             \
2794   product(intx, TypeProfileArgsLimit,     2,                                \
2795           "max number of call arguments to consider for type profiling")    \
2796                                                                             \
2797   product(intx, TypeProfileParmsLimit,    2,                                \
2798           "max number of incoming parameters to consider for type profiling"\
2799           ", -1 for all")                                                   \
2800                                                                             \
2801   /* statistics */                                                          \
2802   develop(bool, CountCompiledCalls, false,                                  \
2803           "Count method invocations")                                       \
2804                                                                             \
2805   notproduct(bool, CountRuntimeCalls, false,                                \
2806           "Count VM runtime calls")                                         \
2807                                                                             \
2808   develop(bool, CountJNICalls, false,                                       \
2809           "Count jni method invocations")                                   \
2810                                                                             \
2811   notproduct(bool, CountJVMCalls, false,                                    \
2812           "Count jvm method invocations")                                   \
2813                                                                             \
2814   notproduct(bool, CountRemovableExceptions, false,                         \
2815           "Count exceptions that could be replaced by branches due to "     \
2816           "inlining")                                                       \
2817                                                                             \
2818   notproduct(bool, ICMissHistogram, false,                                  \
2819           "Produce histogram of IC misses")                                 \
2820                                                                             \
2821   notproduct(bool, PrintClassStatistics, false,                             \
2822           "Print class statistics at end of run")                           \
2823                                                                             \
2824   notproduct(bool, PrintMethodStatistics, false,                            \
2825           "Print method statistics at end of run")                          \
2826                                                                             \
2827   /* interpreter */                                                         \
2828   develop(bool, ClearInterpreterLocals, false,                              \
2829           "Always clear local variables of interpreter activations upon "   \
2830           "entry")                                                          \
2831                                                                             \
2832   product_pd(bool, RewriteBytecodes,                                        \
2833           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2834                                                                             \
2835   product_pd(bool, RewriteFrequentPairs,                                    \
2836           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2837                                                                             \
2838   diagnostic(bool, PrintInterpreter, false,                                 \
2839           "Print the generated interpreter code")                           \
2840                                                                             \
2841   product(bool, UseInterpreter, true,                                       \
2842           "Use interpreter for non-compiled methods")                       \
2843                                                                             \
2844   develop(bool, UseFastSignatureHandlers, true,                             \
2845           "Use fast signature handlers for native calls")                   \
2846                                                                             \
2847   product(bool, UseLoopCounter, true,                                       \
2848           "Increment invocation counter on backward branch")                \
2849                                                                             \
2850   product(bool, UseFastEmptyMethods, true,                                  \
2851           "Use fast method entry code for empty methods")                   \
2852                                                                             \
2853   product(bool, UseFastAccessorMethods, true,                               \
2854           "Use fast method entry code for accessor methods")                \
2855                                                                             \
2856   product_pd(bool, UseOnStackReplacement,                                   \
2857           "Use on stack replacement, calls runtime if invoc. counter "      \
2858           "overflows in loop")                                              \
2859                                                                             \
2860   notproduct(bool, TraceOnStackReplacement, false,                          \
2861           "Trace on stack replacement")                                     \
2862                                                                             \
2863   product_pd(bool, PreferInterpreterNativeStubs,                            \
2864           "Use always interpreter stubs for native methods invoked via "    \
2865           "interpreter")                                                    \
2866                                                                             \
2867   develop(bool, CountBytecodes, false,                                      \
2868           "Count number of bytecodes executed")                             \
2869                                                                             \
2870   develop(bool, PrintBytecodeHistogram, false,                              \
2871           "Print histogram of the executed bytecodes")                      \
2872                                                                             \
2873   develop(bool, PrintBytecodePairHistogram, false,                          \
2874           "Print histogram of the executed bytecode pairs")                 \
2875                                                                             \
2876   diagnostic(bool, PrintSignatureHandlers, false,                           \
2877           "Print code generated for native method signature handlers")      \
2878                                                                             \
2879   develop(bool, VerifyOops, false,                                          \
2880           "Do plausibility checks for oops")                                \
2881                                                                             \
2882   develop(bool, CheckUnhandledOops, false,                                  \
2883           "Check for unhandled oops in VM code")                            \
2884                                                                             \
2885   develop(bool, VerifyJNIFields, trueInDebug,                               \
2886           "Verify jfieldIDs for instance fields")                           \
2887                                                                             \
2888   notproduct(bool, VerifyJNIEnvThread, false,                               \
2889           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2890           "from JNI")                                                       \
2891                                                                             \
2892   develop(bool, VerifyFPU, false,                                           \
2893           "Verify FPU state (check for NaN's, etc.)")                       \
2894                                                                             \
2895   develop(bool, VerifyThread, false,                                        \
2896           "Watch the thread register for corruption (SPARC only)")          \
2897                                                                             \
2898   develop(bool, VerifyActivationFrameSize, false,                           \
2899           "Verify that activation frame didn't become smaller than its "    \
2900           "minimal size")                                                   \
2901                                                                             \
2902   develop(bool, TraceFrequencyInlining, false,                              \
2903           "Trace frequency based inlining")                                 \
2904                                                                             \
2905   develop_pd(bool, InlineIntrinsics,                                        \
2906           "Inline intrinsics that can be statically resolved")              \
2907                                                                             \
2908   product_pd(bool, ProfileInterpreter,                                      \
2909           "Profile at the bytecode level during interpretation")            \
2910                                                                             \
2911   develop(bool, TraceProfileInterpreter, false,                             \
2912           "Trace profiling at the bytecode level during interpretation. "   \
2913           "This outputs the profiling information collected to improve "    \
2914           "jit compilation.")                                               \
2915                                                                             \
2916   develop_pd(bool, ProfileTraps,                                            \
2917           "Profile deoptimization traps at the bytecode level")             \
2918                                                                             \
2919   product(intx, ProfileMaturityPercentage, 20,                              \
2920           "number of method invocations/branches (expressed as % of "       \
2921           "CompileThreshold) before using the method's profile")            \
2922                                                                             \
2923   develop(bool, PrintMethodData, false,                                     \
2924           "Print the results of +ProfileInterpreter at end of run")         \
2925                                                                             \
2926   develop(bool, VerifyDataPointer, trueInDebug,                             \
2927           "Verify the method data pointer during interpreter profiling")    \
2928                                                                             \
2929   develop(bool, VerifyCompiledCode, false,                                  \
2930           "Include miscellaneous runtime verifications in nmethod code; "   \
2931           "default off because it disturbs nmethod size heuristics")        \
2932                                                                             \
2933   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2934           "Manually make GC thread crash then dump java stack trace;  "     \
2935           "Test only")                                                      \
2936                                                                             \
2937   /* compilation */                                                         \
2938   product(bool, UseCompiler, true,                                          \
2939           "Use Just-In-Time compilation")                                   \
2940                                                                             \
2941   develop(bool, TraceCompilationPolicy, false,                              \
2942           "Trace compilation policy")                                       \
2943                                                                             \
2944   develop(bool, TimeCompilationPolicy, false,                               \
2945           "Time the compilation policy")                                    \
2946                                                                             \
2947   product(bool, UseCounterDecay, true,                                      \
2948           "Adjust recompilation counters")                                  \
2949                                                                             \
2950   develop(intx, CounterHalfLifeTime,    30,                                 \
2951           "Half-life time of invocation counters (in seconds)")             \
2952                                                                             \
2953   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2954           "The minimum interval (in milliseconds) between invocation of "   \
2955           "CounterDecay")                                                   \
2956                                                                             \
2957   product(bool, AlwaysCompileLoopMethods, false,                            \
2958           "When using recompilation, never interpret methods "              \
2959           "containing loops")                                               \
2960                                                                             \
2961   product(bool, DontCompileHugeMethods, true,                               \
2962           "Do not compile methods > HugeMethodLimit")                       \
2963                                                                             \
2964   /* Bytecode escape analysis estimation. */                                \
2965   product(bool, EstimateArgEscape, true,                                    \
2966           "Analyze bytecodes to estimate escape state of arguments")        \
2967                                                                             \
2968   product(intx, BCEATraceLevel, 0,                                          \
2969           "How much tracing to do of bytecode escape analysis estimates")   \
2970                                                                             \
2971   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2972           "Maximum number of nested calls that are analyzed by BC EA")      \
2973                                                                             \
2974   product(intx, MaxBCEAEstimateSize, 150,                                   \
2975           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2976                                                                             \
2977   product(intx,  AllocatePrefetchStyle, 1,                                  \
2978           "0 = no prefetch, "                                               \
2979           "1 = prefetch instructions for each allocation, "                 \
2980           "2 = use TLAB watermark to gate allocation prefetch, "            \
2981           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2982                                                                             \
2983   product(intx,  AllocatePrefetchDistance, -1,                              \
2984           "Distance to prefetch ahead of allocation pointer")               \
2985                                                                             \
2986   product(intx,  AllocatePrefetchLines, 3,                                  \
2987           "Number of lines to prefetch ahead of array allocation pointer")  \
2988                                                                             \
2989   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2990           "Number of lines to prefetch ahead of instance allocation "       \
2991           "pointer")                                                        \
2992                                                                             \
2993   product(intx,  AllocatePrefetchStepSize, 16,                              \
2994           "Step size in bytes of sequential prefetch instructions")         \
2995                                                                             \
2996   product(intx,  AllocatePrefetchInstr, 0,                                  \
2997           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2998                                                                             \
2999   /* deoptimization */                                                      \
3000   develop(bool, TraceDeoptimization, false,                                 \
3001           "Trace deoptimization")                                           \
3002                                                                             \
3003   develop(bool, DebugDeoptimization, false,                                 \
3004           "Tracing various information while debugging deoptimization")     \
3005                                                                             \
3006   product(intx, SelfDestructTimer, 0,                                       \
3007           "Will cause VM to terminate after a given time (in minutes) "     \
3008           "(0 means off)")                                                  \
3009                                                                             \
3010   product(intx, MaxJavaStackTraceDepth, 1024,                               \
3011           "The maximum number of lines in the stack trace for Java "        \
3012           "exceptions (0 means all)")                                       \
3013                                                                             \
3014   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3015           "Guarantee a safepoint (at least) every so many milliseconds "    \
3016           "(0 means none)"))                                                \
3017                                                                             \
3018   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3019           "Guarantee a safepoint (at least) every so many milliseconds "    \
3020           "(0 means none)"))                                                \
3021                                                                             \
3022   product(intx, SafepointTimeoutDelay, 10000,                               \
3023           "Delay in milliseconds for option SafepointTimeout")              \
3024                                                                             \
3025   product(intx, NmethodSweepFraction, 16,                                   \
3026           "Number of invocations of sweeper to cover all nmethods")         \
3027                                                                             \
3028   product(intx, NmethodSweepCheckInterval, 5,                               \
3029           "Compilers wake up every n seconds to possibly sweep nmethods")   \
3030                                                                             \
3031   product(intx, NmethodSweepActivity, 10,                                   \
3032           "Removes cold nmethods from code cache if > 0. Higher values "    \
3033           "result in more aggressive sweeping")                             \
3034                                                                             \
3035   notproduct(bool, LogSweeper, false,                                       \
3036           "Keep a ring buffer of sweeper activity")                         \
3037                                                                             \
3038   notproduct(intx, SweeperLogEntries, 1024,                                 \
3039           "Number of records in the ring buffer of sweeper activity")       \
3040                                                                             \
3041   notproduct(intx, MemProfilingInterval, 500,                               \
3042           "Time between each invocation of the MemProfiler")                \
3043                                                                             \
3044   develop(intx, MallocCatchPtr, -1,                                         \
3045           "Hit breakpoint when mallocing/freeing this pointer")             \
3046                                                                             \
3047   notproduct(intx, AssertRepeat, 1,                                         \
3048           "number of times to evaluate expression in assert "               \
3049           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
3050                                                                             \
3051   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3052           "List of assertions (file:line) to muzzle")                       \
3053                                                                             \
3054   notproduct(uintx, HandleAllocationLimit, 1024,                            \
3055           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3056           "is used")                                                        \
3057                                                                             \
3058   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
3059           "Threshold for total handle allocation when "                     \
3060           "+TraceHandleAllocation is used")                                 \
3061                                                                             \
3062   develop(intx, StackPrintLimit, 100,                                       \
3063           "number of stack frames to print in VM-level stack dump")         \
3064                                                                             \
3065   notproduct(intx, MaxElementPrintSize, 256,                                \
3066           "maximum number of elements to print")                            \
3067                                                                             \
3068   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3069           "maximum number of subklasses to print when printing klass")      \
3070                                                                             \
3071   product(intx, MaxInlineLevel, 9,                                          \
3072           "maximum number of nested calls that are inlined")                \
3073                                                                             \
3074   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3075           "maximum number of nested recursive calls that are inlined")      \
3076                                                                             \
3077   develop(intx, MaxForceInlineLevel, 100,                                   \
3078           "maximum number of nested calls that are forced for inlining "    \
3079           "(using CompilerOracle or marked w/ @ForceInline)")               \
3080                                                                             \
3081   product_pd(intx, InlineSmallCode,                                         \
3082           "Only inline already compiled methods if their code size is "     \
3083           "less than this")                                                 \
3084                                                                             \
3085   product(intx, MaxInlineSize, 35,                                          \
3086           "The maximum bytecode size of a method to be inlined")            \
3087                                                                             \
3088   product_pd(intx, FreqInlineSize,                                          \
3089           "The maximum bytecode size of a frequent method to be inlined")   \
3090                                                                             \
3091   product(intx, MaxTrivialSize, 6,                                          \
3092           "The maximum bytecode size of a trivial method to be inlined")    \
3093                                                                             \
3094   product(intx, MinInliningThreshold, 250,                                  \
3095           "The minimum invocation count a method needs to have to be "      \
3096           "inlined")                                                        \
3097                                                                             \
3098   develop(intx, MethodHistogramCutoff, 100,                                 \
3099           "The cutoff value for method invocation histogram (+CountCalls)") \
3100                                                                             \
3101   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3102           "Number of interpreted methods to show in profile")               \
3103                                                                             \
3104   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3105           "Number of compiled methods to show in profile")                  \
3106                                                                             \
3107   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3108           "Number of stub methods to show in profile")                      \
3109                                                                             \
3110   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3111           "Number of runtime stub nodes to show in profile")                \
3112                                                                             \
3113   product(intx, ProfileIntervalsTicks, 100,                                 \
3114           "Number of ticks between printing of interval profile "           \
3115           "(+ProfileIntervals)")                                            \
3116                                                                             \
3117   notproduct(intx, ScavengeALotInterval,     1,                             \
3118           "Interval between which scavenge will occur with +ScavengeALot")  \
3119                                                                             \
3120   notproduct(intx, FullGCALotInterval,     1,                               \
3121           "Interval between which full gc will occur with +FullGCALot")     \
3122                                                                             \
3123   notproduct(intx, FullGCALotStart,     0,                                  \
3124           "For which invocation to start FullGCAlot")                       \
3125                                                                             \
3126   notproduct(intx, FullGCALotDummies,  32*K,                                \
3127           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3128           "to move")                                                        \
3129                                                                             \
3130   develop(intx, DontYieldALotInterval,    10,                               \
3131           "Interval between which yields will be dropped (milliseconds)")   \
3132                                                                             \
3133   develop(intx, MinSleepInterval,     1,                                    \
3134           "Minimum sleep() interval (milliseconds) when "                   \
3135           "ConvertSleepToYield is off (used for Solaris)")                  \
3136                                                                             \
3137   develop(intx, ProfilerPCTickThreshold,    15,                             \
3138           "Number of ticks in a PC buckets to be a hotspot")                \
3139                                                                             \
3140   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3141           "Number of exits until DeoptimizeALot kicks in")                  \
3142                                                                             \
3143   notproduct(intx, ZombieALotInterval,     5,                               \
3144           "Number of exits until ZombieALot kicks in")                      \
3145                                                                             \
3146   diagnostic(intx, MallocVerifyInterval,     0,                             \
3147           "If non-zero, verify C heap after every N calls to "              \
3148           "malloc/realloc/free")                                            \
3149                                                                             \
3150   diagnostic(intx, MallocVerifyStart,     0,                                \
3151           "If non-zero, start verifying C heap after Nth call to "          \
3152           "malloc/realloc/free")                                            \
3153                                                                             \
3154   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3155           "If non-zero, maximum number of words that malloc/realloc can "   \
3156           "allocate (for testing only)")                                    \
3157                                                                             \
3158   product(intx, TypeProfileWidth,     2,                                    \
3159           "Number of receiver types to record in call/cast profile")        \
3160                                                                             \
3161   develop(intx, BciProfileWidth,      2,                                    \
3162           "Number of return bci's to record in ret profile")                \
3163                                                                             \
3164   product(intx, PerMethodRecompilationCutoff, 400,                          \
3165           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3166                                                                             \
3167   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3168           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3169                                                                             \
3170   product(intx, PerMethodTrapLimit,  100,                                   \
3171           "Limit on traps (of one kind) in a method (includes inlines)")    \
3172                                                                             \
3173   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3174           "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3175                                                                             \
3176   product(intx, PerBytecodeTrapLimit,  4,                                   \
3177           "Limit on traps (of one kind) at a particular BCI")               \
3178                                                                             \
3179   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3180           "Extra method data trap entries for speculation")                 \
3181                                                                             \
3182   develop(intx, InlineFrequencyRatio,    20,                                \
3183           "Ratio of call site execution to caller method invocation")       \
3184                                                                             \
3185   develop_pd(intx, InlineFrequencyCount,                                    \
3186           "Count of call site execution necessary to trigger frequent "     \
3187           "inlining")                                                       \
3188                                                                             \
3189   develop(intx, InlineThrowCount,    50,                                    \
3190           "Force inlining of interpreted methods that throw this often")    \
3191                                                                             \
3192   develop(intx, InlineThrowMaxSize,   200,                                  \
3193           "Force inlining of throwing methods smaller than this")           \
3194                                                                             \
3195   develop(intx, ProfilerNodeSize,  1024,                                    \
3196           "Size in K to allocate for the Profile Nodes of each thread")     \
3197                                                                             \
3198   product_pd(intx, PreInflateSpin,                                          \
3199           "Number of times to spin wait before inflation")                  \
3200                                                                             \
3201   /* gc parameters */                                                       \
3202   product(uintx, InitialHeapSize, 0,                                        \
3203           "Initial heap size (in bytes); zero means use ergonomics")        \
3204                                                                             \
3205   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3206           "Maximum heap size (in bytes)")                                   \
3207                                                                             \
3208   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3209           "Initial tenured generation size (in bytes)")                     \
3210                                                                             \
3211   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3212           "Initial new generation size (in bytes)")                         \
3213                                                                             \
3214   product(uintx, MaxNewSize, max_uintx,                                     \
3215           "Maximum new generation size (in bytes), max_uintx means set "    \
3216           "ergonomically")                                                  \
3217                                                                             \
3218   product(uintx, PretenureSizeThreshold, 0,                                 \
3219           "Maximum size in bytes of objects allocated in DefNew "           \
3220           "generation; zero means no maximum")                              \
3221                                                                             \
3222   product(uintx, TLABSize, 0,                                               \
3223           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3224                                                                             \
3225   product(uintx, MinTLABSize, 2*K,                                          \
3226           "Minimum allowed TLAB size (in bytes)")                           \
3227                                                                             \
3228   product(uintx, TLABAllocationWeight, 35,                                  \
3229           "Allocation averaging weight")                                    \
3230                                                                             \
3231   product(uintx, TLABWasteTargetPercent, 1,                                 \
3232           "Percentage of Eden that can be wasted")                          \
3233                                                                             \
3234   product(uintx, TLABRefillWasteFraction,    64,                            \
3235           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3236                                                                             \
3237   product(uintx, TLABWasteIncrement,    4,                                  \
3238           "Increment allowed waste at slow allocation")                     \
3239                                                                             \
3240   product(uintx, SurvivorRatio, 8,                                          \
3241           "Ratio of eden/survivor space size")                              \
3242                                                                             \
3243   product(uintx, NewRatio, 2,                                               \
3244           "Ratio of old/new generation sizes")                              \
3245                                                                             \
3246   product_pd(uintx, NewSizeThreadIncrease,                                  \
3247           "Additional size added to desired new generation size per "       \
3248           "non-daemon thread (in bytes)")                                   \
3249                                                                             \
3250   product_pd(uintx, MetaspaceSize,                                          \
3251           "Initial size of Metaspaces (in bytes)")                          \
3252                                                                             \
3253   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3254           "Maximum size of Metaspaces (in bytes)")                          \
3255                                                                             \
3256   product(uintx, CompressedClassSpaceSize, 1*G,                             \
3257           "Maximum size of class area in Metaspace when compressed "        \
3258           "class pointers are used")                                        \
3259                                                                             \
3260   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3261           "The minimum percentage of heap free after GC to avoid expansion."\
3262           " For most GCs this applies to the old generation. In G1 and"     \
3263           " ParallelGC it applies to the whole heap.")                      \
3264                                                                             \
3265   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3266           "The maximum percentage of heap free after GC to avoid shrinking."\
3267           " For most GCs this applies to the old generation. In G1 and"     \
3268           " ParallelGC it applies to the whole heap.")                      \
3269                                                                             \
3270   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3271           "Number of milliseconds per MB of free space in the heap")        \
3272                                                                             \
3273   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3274           "The minimum change in heap space due to GC (in bytes)")          \
3275                                                                             \
3276   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3277           "The minimum expansion of Metaspace (in bytes)")                  \
3278                                                                             \
3279   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3280           "The minimum percentage of Metaspace free after GC to avoid "     \
3281           "expansion")                                                      \
3282                                                                             \
3283   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3284           "The maximum percentage of Metaspace free after GC to avoid "     \
3285           "shrinking")                                                      \
3286                                                                             \
3287   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3288           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3289                                                                             \
3290   product(uintx, QueuedAllocationWarningCount, 0,                           \
3291           "Number of times an allocation that queues behind a GC "          \
3292           "will retry before printing a warning")                           \
3293                                                                             \
3294   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3295           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3296                                                                             \
3297   diagnostic(intx, VerifyGCLevel,     0,                                    \
3298           "Generation level at which to start +VerifyBefore/AfterGC")       \
3299                                                                             \
3300   product(uintx, MaxTenuringThreshold,    15,                               \
3301           "Maximum value for tenuring threshold")                           \
3302                                                                             \
3303   product(uintx, InitialTenuringThreshold,    7,                            \
3304           "Initial value for tenuring threshold")                           \
3305                                                                             \
3306   product(uintx, TargetSurvivorRatio,    50,                                \
3307           "Desired percentage of survivor space used after scavenge")       \
3308                                                                             \
3309   product(uintx, MarkSweepDeadRatio,     5,                                 \
3310           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3311           "Serial mark sweep treats this as both the minimum and maximum "  \
3312           "value. "                                                         \
3313           "CMS uses this value only if it falls back to mark sweep. "       \
3314           "Par compact uses a variable scale based on the density of the "  \
3315           "generation and treats this as the maximum value when the heap "  \
3316           "is either completely full or completely empty.  Par compact "    \
3317           "also has a smaller default value; see arguments.cpp.")           \
3318                                                                             \
3319   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3320           "How often should we fully compact the heap (ignoring the dead "  \
3321           "space parameters)")                                              \
3322                                                                             \
3323   product(intx, PrintCMSStatistics, 0,                                      \
3324           "Statistics for CMS")                                             \
3325                                                                             \
3326   product(bool, PrintCMSInitiationStatistics, false,                        \
3327           "Statistics for initiating a CMS collection")                     \
3328                                                                             \
3329   product(intx, PrintFLSStatistics, 0,                                      \
3330           "Statistics for CMS' FreeListSpace")                              \
3331                                                                             \
3332   product(intx, PrintFLSCensus, 0,                                          \
3333           "Census for CMS' FreeListSpace")                                  \
3334                                                                             \
3335   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3336           "Delay between expansion and allocation (in milliseconds)")       \
3337                                                                             \
3338   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3339           "Delay in scheduling GC workers (in milliseconds)")               \
3340                                                                             \
3341   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3342           "(Unstable) Number of times to iterate in safepoint loop "        \
3343           "before blocking VM threads ")                                    \
3344                                                                             \
3345   product(intx, DeferPollingPageLoopCount,     -1,                          \
3346           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3347           "before changing safepoint polling page to RO ")                  \
3348                                                                             \
3349   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3350                                                                             \
3351   product(bool, PSChunkLargeArrays, true,                                   \
3352           "Process large arrays in chunks")                                 \
3353                                                                             \
3354   product(uintx, GCDrainStackTargetSize, 64,                                \
3355           "Number of entries we will try to leave on the stack "            \
3356           "during parallel gc")                                             \
3357                                                                             \
3358   /* stack parameters */                                                    \
3359   product_pd(intx, StackYellowPages,                                        \
3360           "Number of yellow zone (recoverable overflows) pages")            \
3361                                                                             \
3362   product_pd(intx, StackRedPages,                                           \
3363           "Number of red zone (unrecoverable overflows) pages")             \
3364                                                                             \
3365   product_pd(intx, StackShadowPages,                                        \
3366           "Number of shadow zone (for overflow checking) pages "            \
3367           "this should exceed the depth of the VM and native call stack")   \
3368                                                                             \
3369   product_pd(intx, ThreadStackSize,                                         \
3370           "Thread Stack Size (in Kbytes)")                                  \
3371                                                                             \
3372   product_pd(intx, VMThreadStackSize,                                       \
3373           "Non-Java Thread Stack Size (in Kbytes)")                         \
3374                                                                             \
3375   product_pd(intx, CompilerThreadStackSize,                                 \
3376           "Compiler Thread Stack Size (in Kbytes)")                         \
3377                                                                             \
3378   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3379           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3380                                                                             \
3381   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3382           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3383           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3384           "disable this feature")                                           \
3385                                                                             \
3386   /* code cache parameters */                                               \
3387   /* ppc64 has large code-entry alignment. */                               \
3388   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64),                  \
3389           "Code cache segment size (in bytes) - smallest unit of "          \
3390           "allocation")                                                     \
3391                                                                             \
3392   develop_pd(intx, CodeEntryAlignment,                                      \
3393           "Code entry alignment for generated code (in bytes)")             \
3394                                                                             \
3395   product_pd(intx, OptoLoopAlignment,                                       \
3396           "Align inner loops to zero relative to this modulus")             \
3397                                                                             \
3398   product_pd(uintx, InitialCodeCacheSize,                                   \
3399           "Initial code cache size (in bytes)")                             \
3400                                                                             \
3401   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3402           "Minimum code cache size (in bytes) required to start VM.")       \
3403                                                                             \
3404   product_pd(uintx, ReservedCodeCacheSize,                                  \
3405           "Reserved code cache size (in bytes) - maximum code cache size")  \
3406                                                                             \
3407   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3408           "When less than X space left, we stop compiling")                 \
3409                                                                             \
3410   product_pd(uintx, CodeCacheExpansionSize,                                 \
3411           "Code cache expansion size (in bytes)")                           \
3412                                                                             \
3413   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3414           "Minimum number of segments in a code cache block")               \
3415                                                                             \
3416   notproduct(bool, ExitOnFullCodeCache, false,                              \
3417           "Exit the VM if we fill the code cache")                          \
3418                                                                             \
3419   product(bool, UseCodeCacheFlushing, true,                                 \
3420           "Remove cold/old nmethods from the code cache")                   \
3421                                                                             \
3422   /* interpreter debugging */                                               \
3423   develop(intx, BinarySwitchThreshold, 5,                                   \
3424           "Minimal number of lookupswitch entries for rewriting to binary " \
3425           "switch")                                                         \
3426                                                                             \
3427   develop(intx, StopInterpreterAt, 0,                                       \
3428           "Stop interpreter execution at specified bytecode number")        \
3429                                                                             \
3430   develop(intx, TraceBytecodesAt, 0,                                        \
3431           "Trace bytecodes starting with specified bytecode number")        \
3432                                                                             \
3433   /* compiler interface */                                                  \
3434   develop(intx, CIStart, 0,                                                 \
3435           "The id of the first compilation to permit")                      \
3436                                                                             \
3437   develop(intx, CIStop, max_jint,                                           \
3438           "The id of the last compilation to permit")                       \
3439                                                                             \
3440   develop(intx, CIStartOSR, 0,                                              \
3441           "The id of the first osr compilation to permit "                  \
3442           "(CICountOSR must be on)")                                        \
3443                                                                             \
3444   develop(intx, CIStopOSR, max_jint,                                        \
3445           "The id of the last osr compilation to permit "                   \
3446           "(CICountOSR must be on)")                                        \
3447                                                                             \
3448   develop(intx, CIBreakAtOSR, -1,                                           \
3449           "The id of osr compilation to break at")                          \
3450                                                                             \
3451   develop(intx, CIBreakAt, -1,                                              \
3452           "The id of compilation to break at")                              \
3453                                                                             \
3454   product(ccstrlist, CompileOnly, "",                                       \
3455           "List of methods (pkg/class.name) to restrict compilation to")    \
3456                                                                             \
3457   product(ccstr, CompileCommandFile, NULL,                                  \
3458           "Read compiler commands from this file [.hotspot_compiler]")      \
3459                                                                             \
3460   product(ccstrlist, CompileCommand, "",                                    \
3461           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3462                                                                             \
3463   develop(bool, ReplayCompiles, false,                                      \
3464           "Enable replay of compilations from ReplayDataFile")              \
3465                                                                             \
3466   product(ccstr, ReplayDataFile, NULL,                                      \
3467           "File containing compilation replay information"                  \
3468           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3469                                                                             \
3470    product(ccstr, InlineDataFile, NULL,                                     \
3471           "File containing inlining replay information"                     \
3472           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3473                                                                             \
3474   develop(intx, ReplaySuppressInitializers, 2,                              \
3475           "Control handling of class initialization during replay: "        \
3476           "0 - don't do anything special; "                                 \
3477           "1 - treat all class initializers as empty; "                     \
3478           "2 - treat class initializers for application classes as empty; " \
3479           "3 - allow all class initializers to run during bootstrap but "   \
3480           "    pretend they are empty after starting replay")               \
3481                                                                             \
3482   develop(bool, ReplayIgnoreInitErrors, false,                              \
3483           "Ignore exceptions thrown during initialization for replay")      \
3484                                                                             \
3485   product(bool, DumpReplayDataOnError, true,                                \
3486           "Record replay data for crashing compiler threads")               \
3487                                                                             \
3488   product(bool, CICompilerCountPerCPU, false,                               \
3489           "1 compiler thread for log(N CPUs)")                              \
3490                                                                             \
3491   develop(intx, CIFireOOMAt,    -1,                                         \
3492           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3493           "(non-negative value throws OOM after this many CI accesses "     \
3494           "in each compile)")                                               \
3495   notproduct(intx, CICrashAt, -1,                                           \
3496           "id of compilation to trigger assert in compiler thread for "     \
3497           "the purpose of testing, e.g. generation of replay data")         \
3498   notproduct(bool, CIObjectFactoryVerify, false,                            \
3499           "enable potentially expensive verification in ciObjectFactory")   \
3500                                                                             \
3501   /* Priorities */                                                          \
3502   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3503                                                                             \
3504   product(intx, ThreadPriorityPolicy, 0,                                    \
3505           "0 : Normal.                                                     "\
3506           "    VM chooses priorities that are appropriate for normal       "\
3507           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3508           "    to normal native priority. Java priorities below "           \
3509           "    NORM_PRIORITY map to lower native priority values. On       "\
3510           "    Windows applications are allowed to use higher native       "\
3511           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3512           "    not use the highest possible native priority,               "\
3513           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3514           "    system threads. On Linux thread priorities are ignored      "\
3515           "    because the OS does not support static priority in          "\
3516           "    SCHED_OTHER scheduling class which is the only choice for   "\
3517           "    non-root, non-realtime applications.                        "\
3518           "1 : Aggressive.                                                 "\
3519           "    Java thread priorities map over to the entire range of      "\
3520           "    native thread priorities. Higher Java thread priorities map "\
3521           "    to higher native thread priorities. This policy should be   "\
3522           "    used with care, as sometimes it can cause performance       "\
3523           "    degradation in the application and/or the entire system. On "\
3524           "    Linux this policy requires root privilege.")                 \
3525                                                                             \
3526   product(bool, ThreadPriorityVerbose, false,                               \
3527           "Print priority changes")                                         \
3528                                                                             \
3529   product(intx, DefaultThreadPriority, -1,                                  \
3530           "The native priority at which threads run if not elsewhere "      \
3531           "specified (-1 means no change)")                                 \
3532                                                                             \
3533   product(intx, CompilerThreadPriority, -1,                                 \
3534           "The native priority at which compiler threads should run "       \
3535           "(-1 means no change)")                                           \
3536                                                                             \
3537   product(intx, VMThreadPriority, -1,                                       \
3538           "The native priority at which the VM thread should run "          \
3539           "(-1 means no change)")                                           \
3540                                                                             \
3541   product(bool, CompilerThreadHintNoPreempt, true,                          \
3542           "(Solaris only) Give compiler threads an extra quanta")           \
3543                                                                             \
3544   product(bool, VMThreadHintNoPreempt, false,                               \
3545           "(Solaris only) Give VM thread an extra quanta")                  \
3546                                                                             \
3547   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3548           "Map Java priorities to OS priorities")                           \
3549                                                                             \
3550   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3551           "Map Java priorities to OS priorities")                           \
3552                                                                             \
3553   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3554           "Map Java priorities to OS priorities")                           \
3555                                                                             \
3556   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3557           "Map Java priorities to OS priorities")                           \
3558                                                                             \
3559   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3560           "Map Java priorities to OS priorities")                           \
3561                                                                             \
3562   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3563           "Map Java priorities to OS priorities")                           \
3564                                                                             \
3565   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3566           "Map Java priorities to OS priorities")                           \
3567                                                                             \
3568   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3569           "Map Java priorities to OS priorities")                           \
3570                                                                             \
3571   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3572           "Map Java priorities to OS priorities")                           \
3573                                                                             \
3574   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3575           "Map Java priorities to OS priorities")                           \
3576                                                                             \
3577   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3578           "Java thread priority 10 maps to critical scheduling priority")   \
3579                                                                             \
3580   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3581           "Compiler thread(s) run at critical scheduling priority")         \
3582                                                                             \
3583   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3584           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3585                                                                             \
3586   /* compiler debugging */                                                  \
3587   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3588           "First class to consider when using +CompileTheWorld")            \
3589                                                                             \
3590   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3591           "Last class to consider when using +CompileTheWorld")             \
3592                                                                             \
3593   develop(intx, NewCodeParameter,      0,                                   \
3594           "Testing Only: Create a dedicated integer parameter before "      \
3595           "putback")                                                        \
3596                                                                             \
3597   /* new oopmap storage allocation */                                       \
3598   develop(intx, MinOopMapAllocation,     8,                                 \
3599           "Minimum number of OopMap entries in an OopMapSet")               \
3600                                                                             \
3601   /* Background Compilation */                                              \
3602   develop(intx, LongCompileThreshold,     50,                               \
3603           "Used with +TraceLongCompiles")                                   \
3604                                                                             \
3605   product(intx, StarvationMonitorInterval,    200,                          \
3606           "Pause between each check (in milliseconds)")                     \
3607                                                                             \
3608   /* recompilation */                                                       \
3609   product_pd(intx, CompileThreshold,                                        \
3610           "number of interpreted method invocations before (re-)compiling") \
3611                                                                             \
3612   product_pd(intx, BackEdgeThreshold,                                       \
3613           "Interpreter Back edge threshold at which an OSR compilation is " \
3614           "invoked")                                                        \
3615                                                                             \
3616   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3617           "Interpreter (tier 0) invocation notification frequency")         \
3618                                                                             \
3619   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3620           "C1 without MDO (tier 2) invocation notification frequency")      \
3621                                                                             \
3622   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3623           "C1 with MDO profiling (tier 3) invocation notification "         \
3624           "frequency")                                                      \
3625                                                                             \
3626   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3627           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3628                                                                             \
3629   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3630           "Interpreter (tier 0) invocation notification frequency")         \
3631                                                                             \
3632   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3633           "C1 without MDO (tier 2) invocation notification frequency")      \
3634                                                                             \
3635   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3636           "C1 with MDO profiling (tier 3) invocation notification "         \
3637           "frequency")                                                      \
3638                                                                             \
3639   product(intx, Tier2CompileThreshold, 0,                                   \
3640           "threshold at which tier 2 compilation is invoked")               \
3641                                                                             \
3642   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3643           "Back edge threshold at which tier 2 compilation is invoked")     \
3644                                                                             \
3645   product(intx, Tier3InvocationThreshold, 200,                              \
3646           "Compile if number of method invocations crosses this "           \
3647           "threshold")                                                      \
3648                                                                             \
3649   product(intx, Tier3MinInvocationThreshold, 100,                           \
3650           "Minimum invocation to compile at tier 3")                        \
3651                                                                             \
3652   product(intx, Tier3CompileThreshold, 2000,                                \
3653           "Threshold at which tier 3 compilation is invoked (invocation "   \
3654           "minimum must be satisfied")                                      \
3655                                                                             \
3656   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3657           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3658                                                                             \
3659   product(intx, Tier4InvocationThreshold, 5000,                             \
3660           "Compile if number of method invocations crosses this "           \
3661           "threshold")                                                      \
3662                                                                             \
3663   product(intx, Tier4MinInvocationThreshold, 600,                           \
3664           "Minimum invocation to compile at tier 4")                        \
3665                                                                             \
3666   product(intx, Tier4CompileThreshold, 15000,                               \
3667           "Threshold at which tier 4 compilation is invoked (invocation "   \
3668           "minimum must be satisfied")                                      \
3669                                                                             \
3670   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3671           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3672                                                                             \
3673   product(intx, Tier3DelayOn, 5,                                            \
3674           "If C2 queue size grows over this amount per compiler thread "    \
3675           "stop compiling at tier 3 and start compiling at tier 2")         \
3676                                                                             \
3677   product(intx, Tier3DelayOff, 2,                                           \
3678           "If C2 queue size is less than this amount per compiler thread "  \
3679           "allow methods compiled at tier 2 transition to tier 3")          \
3680                                                                             \
3681   product(intx, Tier3LoadFeedback, 5,                                       \
3682           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3683           "reaches this amount per compiler thread")                        \
3684                                                                             \
3685   product(intx, Tier4LoadFeedback, 3,                                       \
3686           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3687           "reaches this amount per compiler thread")                        \
3688                                                                             \
3689   product(intx, TieredCompileTaskTimeout, 50,                               \
3690           "Kill compile task if method was not used within "                \
3691           "given timeout in milliseconds")                                  \
3692                                                                             \
3693   product(intx, TieredStopAtLevel, 4,                                       \
3694           "Stop at given compilation level")                                \
3695                                                                             \
3696   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3697           "Start profiling in interpreter if the counters exceed tier 3 "   \
3698           "thresholds by the specified percentage")                         \
3699                                                                             \
3700   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3701           "Increase the compile threshold for C1 compilation if the code "  \
3702           "cache is filled by the specified percentage")                    \
3703                                                                             \
3704   product(intx, TieredRateUpdateMinTime, 1,                                 \
3705           "Minimum rate sampling interval (in milliseconds)")               \
3706                                                                             \
3707   product(intx, TieredRateUpdateMaxTime, 25,                                \
3708           "Maximum rate sampling interval (in milliseconds)")               \
3709                                                                             \
3710   product_pd(bool, TieredCompilation,                                       \
3711           "Enable tiered compilation")                                      \
3712                                                                             \
3713   product(bool, PrintTieredEvents, false,                                   \
3714           "Print tiered events notifications")                              \
3715                                                                             \
3716   product_pd(intx, OnStackReplacePercentage,                                \
3717           "NON_TIERED number of method invocations/branches (expressed as " \
3718           "% of CompileThreshold) before (re-)compiling OSR code")          \
3719                                                                             \
3720   product(intx, InterpreterProfilePercentage, 33,                           \
3721           "NON_TIERED number of method invocations/branches (expressed as " \
3722           "% of CompileThreshold) before profiling in the interpreter")     \
3723                                                                             \
3724   develop(intx, MaxRecompilationSearchLength,    10,                        \
3725           "The maximum number of frames to inspect when searching for "     \
3726           "recompilee")                                                     \
3727                                                                             \
3728   develop(intx, MaxInterpretedSearchLength,     3,                          \
3729           "The maximum number of interpreted frames to skip when searching "\
3730           "for recompilee")                                                 \
3731                                                                             \
3732   develop(intx, DesiredMethodLimit,  8000,                                  \
3733           "The desired maximum method size (in bytecodes) after inlining")  \
3734                                                                             \
3735   develop(intx, HugeMethodLimit,  8000,                                     \
3736           "Don't compile methods larger than this if "                      \
3737           "+DontCompileHugeMethods")                                        \
3738                                                                             \
3739   /* New JDK 1.4 reflection implementation */                               \
3740                                                                             \
3741   develop(bool, UseNewReflection, true,                                     \
3742           "Temporary flag for transition to reflection based on dynamic "   \
3743           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3744           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3745           "changes were needed")                                            \
3746                                                                             \
3747   develop(bool, VerifyReflectionBytecodes, false,                           \
3748           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3749           "in situations like that described in 4486457 or for "            \
3750           "constructors generated for serialization, so can not be enabled "\
3751           "in product.")                                                    \
3752                                                                             \
3753   product(bool, ReflectionWrapResolutionErrors, true,                       \
3754           "Temporary flag for transition to AbstractMethodError wrapped "   \
3755           "in InvocationTargetException. See 6531596")                      \
3756                                                                             \
3757   develop(intx, FastSuperclassLimit, 8,                                     \
3758           "Depth of hardwired instanceof accelerator array")                \
3759                                                                             \
3760   /* Properties for Java libraries  */                                      \
3761                                                                             \
3762   product(uintx, MaxDirectMemorySize, 0,                                    \
3763           "Maximum total size of NIO direct-buffer allocations")            \
3764                                                                             \
3765   /* temporary developer defined flags  */                                  \
3766                                                                             \
3767   diagnostic(bool, UseNewCode, false,                                       \
3768           "Testing Only: Use the new version while testing")                \
3769                                                                             \
3770   diagnostic(bool, UseNewCode2, false,                                      \
3771           "Testing Only: Use the new version while testing")                \
3772                                                                             \
3773   diagnostic(bool, UseNewCode3, false,                                      \
3774           "Testing Only: Use the new version while testing")                \
3775                                                                             \
3776   /* flags for performance data collection */                               \
3777                                                                             \
3778   product(bool, UsePerfData, falseInEmbedded,                               \
3779           "Flag to disable jvmstat instrumentation for performance testing "\
3780           "and problem isolation purposes")                                 \
3781                                                                             \
3782   product(bool, PerfDataSaveToFile, false,                                  \
3783           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3784                                                                             \
3785   product(ccstr, PerfDataSaveFile, NULL,                                    \
3786           "Save PerfData memory to the specified absolute pathname. "       \
3787           "The string %p in the file name (if present) "                    \
3788           "will be replaced by pid")                                        \
3789                                                                             \
3790   product(intx, PerfDataSamplingInterval, 50,                               \
3791           "Data sampling interval (in milliseconds)")                       \
3792                                                                             \
3793   develop(bool, PerfTraceDataCreation, false,                               \
3794           "Trace creation of Performance Data Entries")                     \
3795                                                                             \
3796   develop(bool, PerfTraceMemOps, false,                                     \
3797           "Trace PerfMemory create/attach/detach calls")                    \
3798                                                                             \
3799   product(bool, PerfDisableSharedMem, false,                                \
3800           "Store performance data in standard memory")                      \
3801                                                                             \
3802   product(intx, PerfDataMemorySize, 32*K,                                   \
3803           "Size of performance data memory region. Will be rounded "        \
3804           "up to a multiple of the native os page size.")                   \
3805                                                                             \
3806   product(intx, PerfMaxStringConstLength, 1024,                             \
3807           "Maximum PerfStringConstant string length before truncation")     \
3808                                                                             \
3809   product(bool, PerfAllowAtExitRegistration, false,                         \
3810           "Allow registration of atexit() methods")                         \
3811                                                                             \
3812   product(bool, PerfBypassFileSystemCheck, false,                           \
3813           "Bypass Win32 file system criteria checks (Windows Only)")        \
3814                                                                             \
3815   product(intx, UnguardOnExecutionViolation, 0,                             \
3816           "Unguard page and retry on no-execute fault (Win32 only) "        \
3817           "0=off, 1=conservative, 2=aggressive")                            \
3818                                                                             \
3819   /* Serviceability Support */                                              \
3820                                                                             \
3821   product(bool, ManagementServer, false,                                    \
3822           "Create JMX Management Server")                                   \
3823                                                                             \
3824   product(bool, DisableAttachMechanism, false,                              \
3825           "Disable mechanism that allows tools to attach to this VM")       \
3826                                                                             \
3827   product(bool, StartAttachListener, false,                                 \
3828           "Always start Attach Listener at VM startup")                     \
3829                                                                             \
3830   manageable(bool, PrintConcurrentLocks, false,                             \
3831           "Print java.util.concurrent locks in thread dump")                \
3832                                                                             \
3833   product(bool, TransmitErrorReport, false,                                 \
3834           "Enable error report transmission on erroneous termination")      \
3835                                                                             \
3836   product(ccstr, ErrorReportServer, NULL,                                   \
3837           "Override built-in error report server address")                  \
3838                                                                             \
3839   /* Shared spaces */                                                       \
3840                                                                             \
3841   product(bool, UseSharedSpaces, true,                                      \
3842           "Use shared spaces for metadata")                                 \
3843                                                                             \
3844   product(bool, VerifySharedSpaces, false,                                  \
3845           "Verify shared spaces (false for default archive, true for "      \
3846           "archive specified by -XX:SharedArchiveFile)")                    \
3847                                                                             \
3848   product(bool, RequireSharedSpaces, false,                                 \
3849           "Require shared spaces for metadata")                             \
3850                                                                             \
3851   product(bool, DumpSharedSpaces, false,                                    \
3852           "Special mode: JVM reads a class list, loads classes, builds "    \
3853           "shared spaces, and dumps the shared spaces to a file to be "     \
3854           "used in future JVM runs")                                        \
3855                                                                             \
3856   product(bool, PrintSharedSpaces, false,                                   \
3857           "Print usage of shared spaces")                                   \
3858                                                                             \
3859   product(bool, PrintSharedArchiveAndExit, false,                           \
3860           "Print shared archive file contents")                             \
3861                                                                             \
3862   product(bool, PrintSharedDictionary, false,                               \
3863           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3864           "dictionary")                                                     \
3865                                                                             \
3866   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3867           "Size of read-write space for metadata (in bytes)")               \
3868                                                                             \
3869   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3870           "Size of read-only space for metadata (in bytes)")                \
3871                                                                             \
3872   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3873           "Size of the shared miscellaneous data area (in bytes)")          \
3874                                                                             \
3875   product(uintx, SharedMiscCodeSize,    AARCH64_ONLY(192*K) NOT_AARCH64(120*K), \
3876           "Size of the shared miscellaneous code area (in bytes)")          \
3877                                                                             \
3878   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3879           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3880           "Address to allocate shared memory region for class data")        \
3881                                                                             \
3882   diagnostic(bool, EnableInvokeDynamic, true,                               \
3883           "support JSR 292 (method handles, invokedynamic, "                \
3884           "anonymous classes")                                              \
3885                                                                             \
3886   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3887           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3888           "classes. Just exclude them from the shared dictionary.")         \
3889                                                                             \
3890   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3891           "Print generated stub code for method handles")                   \
3892                                                                             \
3893   develop(bool, TraceMethodHandles, false,                                  \
3894           "trace internal method handle operations")                        \
3895                                                                             \
3896   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3897           "perform extra checks when constructing method handles")          \
3898                                                                             \
3899   diagnostic(bool, ShowHiddenFrames, false,                                 \
3900           "show method handle implementation frames (usually hidden)")      \
3901                                                                             \
3902   experimental(bool, TrustFinalNonStaticFields, false,                      \
3903           "trust final non-static declarations for constant folding")       \
3904                                                                             \
3905   diagnostic(bool, FoldStableValues, true,                                  \
3906           "Optimize loads from stable fields (marked w/ @Stable)")          \
3907                                                                             \
3908   develop(bool, TraceInvokeDynamic, false,                                  \
3909           "trace internal invoke dynamic operations")                       \
3910                                                                             \
3911   diagnostic(bool, PauseAtStartup,      false,                              \
3912           "Causes the VM to pause at startup time and wait for the pause "  \
3913           "file to be removed (default: ./vm.paused.<pid>)")                \
3914                                                                             \
3915   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3916           "The file to create and for whose removal to await when pausing " \
3917           "at startup. (default: ./vm.paused.<pid>)")                       \
3918                                                                             \
3919   diagnostic(bool, PauseAtExit, false,                                      \
3920           "Pause and wait for keypress on exit if a debugger is attached")  \
3921                                                                             \
3922   product(bool, ExtendedDTraceProbes,    false,                             \
3923           "Enable performance-impacting dtrace probes")                     \
3924                                                                             \
3925   product(bool, DTraceMethodProbes, false,                                  \
3926           "Enable dtrace probes for method-entry and method-exit")          \
3927                                                                             \
3928   product(bool, DTraceAllocProbes, false,                                   \
3929           "Enable dtrace probes for object allocation")                     \
3930                                                                             \
3931   product(bool, DTraceMonitorProbes, false,                                 \
3932           "Enable dtrace probes for monitor events")                        \
3933                                                                             \
3934   product(bool, RelaxAccessControlCheck, false,                             \
3935           "Relax the access control checks in the verifier")                \
3936                                                                             \
3937   diagnostic(bool, PrintDTraceDOF, false,                                   \
3938           "Print the DTrace DOF passed to the system for JSDT probes")      \
3939                                                                             \
3940   product(uintx, StringTableSize, defaultStringTableSize,                   \
3941           "Number of buckets in the interned String table")                 \
3942                                                                             \
3943   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3944           "Number of buckets in the JVM internal Symbol table")             \
3945                                                                             \
3946   product(bool, UseStringDeduplication, false,                              \
3947           "Use string deduplication")                                       \
3948                                                                             \
3949   product(bool, PrintStringDeduplicationStatistics, false,                  \
3950           "Print string deduplication statistics")                          \
3951                                                                             \
3952   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3953           "A string must reach this age (or be promoted to an old region) " \
3954           "to be considered for deduplication")                             \
3955                                                                             \
3956   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3957           "Force table resize every time the table is scanned")             \
3958                                                                             \
3959   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3960           "Force table rehash every time the table is scanned")             \
3961                                                                             \
3962   develop(bool, TraceDefaultMethods, false,                                 \
3963           "Trace the default method processing steps")                      \
3964                                                                             \
3965   develop(bool, VerifyGenericSignatures, false,                             \
3966           "Abort VM on erroneous or inconsistent generic signatures")       \
3967                                                                             \
3968   product(bool, UseVMInterruptibleIO, false,                                \
3969           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3970           "EINTR for I/O operations results in OS_INTRPT. The default "     \
3971           "value of this flag is true for JDK 6 and earlier")               \
3972                                                                             \
3973   diagnostic(bool, WhiteBoxAPI, false,                                      \
3974           "Enable internal testing APIs")                                   \
3975                                                                             \
3976   product(bool, PrintGCCause, true,                                         \
3977           "Include GC cause in GC logging")                                 \
3978                                                                             \
3979   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3980            "Default survivor space alignment in bytes")                     \
3981                                                                             \
3982   product(bool , AllowNonVirtualCalls, false,                               \
3983           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3984                                                                             \
3985   product(ccstr, DumpLoadedClassList, NULL,                                 \
3986           "Dump the names all loaded classes, that could be stored into "   \
3987           "the CDS archive, in the specified file")                         \
3988                                                                             \
3989   product(ccstr, SharedClassListFile, NULL,                                 \
3990           "Override the default CDS class list")                            \
3991                                                                             \
3992   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3993           "Override the default location of the CDS archive file")          \
3994                                                                             \
3995   product(ccstr, ExtraSharedClassListFile, NULL,                            \
3996           "Extra classlist for building the CDS archive file")              \
3997                                                                             \
3998   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3999           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
4000           "Allocation less than this value will be allocated "              \
4001           "using malloc. Larger allocations will use mmap.")                \
4002                                                                             \
4003   product(bool, EnableTracing, false,                                       \
4004           "Enable event-based tracing")                                     \
4005                                                                             \
4006   product(bool, UseLockedTracing, false,                                    \
4007           "Use locked-tracing when doing event-based tracing")              \
4008                                                                             \
4009   product_pd(bool, PreserveFramePointer,                                    \
4010              "Use the FP register for holding the frame pointer "           \
4011              "and not as a general purpose register.")
4012 
4013 /*
4014  *  Macros for factoring of globals
4015  */
4016 
4017 // Interface macros
4018 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4019 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4020 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4021 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4022 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4023 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4024 #ifdef PRODUCT
4025 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4026 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4027 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4028 #else
4029 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4030 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4031 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4032 #endif
4033 // Special LP64 flags, product only needed for now.
4034 #ifdef _LP64
4035 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4036 #else
4037 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4038 #endif // _LP64
4039 
4040 // Implementation macros
4041 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4042 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4043 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4044 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4045 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4046 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4047 #ifdef PRODUCT
4048 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4049 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4050 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4051 #else
4052 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4053 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4054 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4055 #endif
4056 #ifdef _LP64
4057 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4058 #else
4059 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4060 #endif // _LP64
4061 
4062 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)
4063 
4064 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
4065 
4066 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
4067 
4068 // Extensions
4069 
4070 #include "runtime/globals_ext.hpp"
4071 
4072 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---