1 /*
   2  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif



  43 #ifdef TARGET_ARCH_sparc
  44 # include "globals_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "globals_zero.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_arm
  50 # include "globals_arm.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_ppc
  53 # include "globals_ppc.hpp"
  54 #endif
  55 #ifdef TARGET_OS_FAMILY_linux
  56 # include "globals_linux.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_solaris
  59 # include "globals_solaris.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_windows
  62 # include "globals_windows.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_aix
  65 # include "globals_aix.hpp"
  66 #endif
  67 #ifdef TARGET_OS_FAMILY_bsd
  68 # include "globals_bsd.hpp"
  69 #endif
  70 #ifdef TARGET_OS_ARCH_linux_x86
  71 # include "globals_linux_x86.hpp"
  72 #endif



  73 #ifdef TARGET_OS_ARCH_linux_sparc
  74 # include "globals_linux_sparc.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_linux_zero
  77 # include "globals_linux_zero.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_solaris_x86
  80 # include "globals_solaris_x86.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_solaris_sparc
  83 # include "globals_solaris_sparc.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_windows_x86
  86 # include "globals_windows_x86.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_linux_arm
  89 # include "globals_linux_arm.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_linux_ppc
  92 # include "globals_linux_ppc.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_aix_ppc
  95 # include "globals_aix_ppc.hpp"
  96 #endif
  97 #ifdef TARGET_OS_ARCH_bsd_x86
  98 # include "globals_bsd_x86.hpp"
  99 #endif
 100 #ifdef TARGET_OS_ARCH_bsd_zero
 101 # include "globals_bsd_zero.hpp"
 102 #endif
 103 #ifdef COMPILER1
 104 #ifdef TARGET_ARCH_x86
 105 # include "c1_globals_x86.hpp"
 106 #endif



 107 #ifdef TARGET_ARCH_sparc
 108 # include "c1_globals_sparc.hpp"
 109 #endif
 110 #ifdef TARGET_ARCH_arm
 111 # include "c1_globals_arm.hpp"
 112 #endif
 113 #ifdef TARGET_ARCH_ppc
 114 # include "c1_globals_ppc.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_linux
 117 # include "c1_globals_linux.hpp"
 118 #endif
 119 #ifdef TARGET_OS_FAMILY_solaris
 120 # include "c1_globals_solaris.hpp"
 121 #endif
 122 #ifdef TARGET_OS_FAMILY_windows
 123 # include "c1_globals_windows.hpp"
 124 #endif
 125 #ifdef TARGET_OS_FAMILY_aix
 126 # include "c1_globals_aix.hpp"
 127 #endif
 128 #ifdef TARGET_OS_FAMILY_bsd
 129 # include "c1_globals_bsd.hpp"
 130 #endif
 131 #endif
 132 #ifdef COMPILER2
 133 #ifdef TARGET_ARCH_x86
 134 # include "c2_globals_x86.hpp"
 135 #endif



 136 #ifdef TARGET_ARCH_sparc
 137 # include "c2_globals_sparc.hpp"
 138 #endif
 139 #ifdef TARGET_ARCH_arm
 140 # include "c2_globals_arm.hpp"
 141 #endif
 142 #ifdef TARGET_ARCH_ppc
 143 # include "c2_globals_ppc.hpp"
 144 #endif
 145 #ifdef TARGET_OS_FAMILY_linux
 146 # include "c2_globals_linux.hpp"
 147 #endif
 148 #ifdef TARGET_OS_FAMILY_solaris
 149 # include "c2_globals_solaris.hpp"
 150 #endif
 151 #ifdef TARGET_OS_FAMILY_windows
 152 # include "c2_globals_windows.hpp"
 153 #endif
 154 #ifdef TARGET_OS_FAMILY_aix
 155 # include "c2_globals_aix.hpp"
 156 #endif
 157 #ifdef TARGET_OS_FAMILY_bsd
 158 # include "c2_globals_bsd.hpp"
 159 #endif
 160 #endif
 161 #ifdef SHARK
 162 #ifdef TARGET_ARCH_zero
 163 # include "shark_globals_zero.hpp"
 164 #endif
 165 #endif
 166 
 167 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 168 define_pd_global(bool, BackgroundCompilation,        false);
 169 define_pd_global(bool, UseTLAB,                      false);
 170 define_pd_global(bool, CICompileOSR,                 false);
 171 define_pd_global(bool, UseTypeProfile,               false);
 172 define_pd_global(bool, UseOnStackReplacement,        false);
 173 define_pd_global(bool, InlineIntrinsics,             false);
 174 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 175 define_pd_global(bool, ProfileInterpreter,           false);
 176 define_pd_global(bool, ProfileTraps,                 false);
 177 define_pd_global(bool, TieredCompilation,            false);
 178 
 179 define_pd_global(intx, CompileThreshold,             0);
 180 define_pd_global(intx, BackEdgeThreshold,            0);
 181 
 182 define_pd_global(intx, OnStackReplacePercentage,     0);
 183 define_pd_global(bool, ResizeTLAB,                   false);
 184 define_pd_global(intx, FreqInlineSize,               0);
 185 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 186 define_pd_global(intx, InlineClassNatives,           true);
 187 define_pd_global(intx, InlineUnsafeOps,              true);
 188 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 189 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 190 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 191 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 192 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 193 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 194 define_pd_global(bool, NeverActAsServerClassMachine, true);
 195 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 196 #define CI_COMPILER_COUNT 0
 197 #else
 198 
 199 #ifdef COMPILER2
 200 #define CI_COMPILER_COUNT 2
 201 #else
 202 #define CI_COMPILER_COUNT 1
 203 #endif // COMPILER2
 204 
 205 #endif // no compilers
 206 
 207 // string type aliases used only in this file
 208 typedef const char* ccstr;
 209 typedef const char* ccstrlist;   // represents string arguments which accumulate
 210 
 211 struct Flag {
 212   enum Flags {
 213     // value origin
 214     DEFAULT          = 0,
 215     COMMAND_LINE     = 1,
 216     ENVIRON_VAR      = 2,
 217     CONFIG_FILE      = 3,
 218     MANAGEMENT       = 4,
 219     ERGONOMIC        = 5,
 220     ATTACH_ON_DEMAND = 6,
 221     INTERNAL         = 7,
 222 
 223     LAST_VALUE_ORIGIN = INTERNAL,
 224     VALUE_ORIGIN_BITS = 4,
 225     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 226 
 227     // flag kind
 228     KIND_PRODUCT            = 1 << 4,
 229     KIND_MANAGEABLE         = 1 << 5,
 230     KIND_DIAGNOSTIC         = 1 << 6,
 231     KIND_EXPERIMENTAL       = 1 << 7,
 232     KIND_NOT_PRODUCT        = 1 << 8,
 233     KIND_DEVELOP            = 1 << 9,
 234     KIND_PLATFORM_DEPENDENT = 1 << 10,
 235     KIND_READ_WRITE         = 1 << 11,
 236     KIND_C1                 = 1 << 12,
 237     KIND_C2                 = 1 << 13,
 238     KIND_ARCH               = 1 << 14,
 239     KIND_SHARK              = 1 << 15,
 240     KIND_LP64_PRODUCT       = 1 << 16,
 241     KIND_COMMERCIAL         = 1 << 17,
 242 
 243     KIND_MASK = ~VALUE_ORIGIN_MASK
 244   };
 245 
 246   const char* _type;
 247   const char* _name;
 248   void* _addr;
 249   NOT_PRODUCT(const char* _doc;)
 250   Flags _flags;
 251 
 252   // points to all Flags static array
 253   static Flag* flags;
 254 
 255   // number of flags
 256   static size_t numFlags;
 257 
 258   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false);
 259   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 260 
 261   void check_writable();
 262 
 263   bool is_bool() const;
 264   bool get_bool() const;
 265   void set_bool(bool value);
 266 
 267   bool is_intx() const;
 268   intx get_intx() const;
 269   void set_intx(intx value);
 270 
 271   bool is_uintx() const;
 272   uintx get_uintx() const;
 273   void set_uintx(uintx value);
 274 
 275   bool is_uint64_t() const;
 276   uint64_t get_uint64_t() const;
 277   void set_uint64_t(uint64_t value);
 278 
 279   bool is_double() const;
 280   double get_double() const;
 281   void set_double(double value);
 282 
 283   bool is_ccstr() const;
 284   bool ccstr_accumulates() const;
 285   ccstr get_ccstr() const;
 286   void set_ccstr(ccstr value);
 287 
 288   Flags get_origin();
 289   void set_origin(Flags origin);
 290 
 291   bool is_default();
 292   bool is_ergonomic();
 293   bool is_command_line();
 294 
 295   bool is_product() const;
 296   bool is_manageable() const;
 297   bool is_diagnostic() const;
 298   bool is_experimental() const;
 299   bool is_notproduct() const;
 300   bool is_develop() const;
 301   bool is_read_write() const;
 302   bool is_commercial() const;
 303 
 304   bool is_constant_in_binary() const;
 305 
 306   bool is_unlocker() const;
 307   bool is_unlocked() const;
 308   bool is_writeable() const;
 309   bool is_external() const;
 310 
 311   bool is_unlocker_ext() const;
 312   bool is_unlocked_ext() const;
 313   bool is_writeable_ext() const;
 314   bool is_external_ext() const;
 315 
 316   void unlock_diagnostic();
 317 
 318   void get_locked_message(char*, int) const;
 319   void get_locked_message_ext(char*, int) const;
 320 
 321   void print_on(outputStream* st, bool withComments = false );
 322   void print_kind(outputStream* st);
 323   void print_as_flag(outputStream* st);
 324 };
 325 
 326 // debug flags control various aspects of the VM and are global accessible
 327 
 328 // use FlagSetting to temporarily change some debug flag
 329 // e.g. FlagSetting fs(DebugThisAndThat, true);
 330 // restored to previous value upon leaving scope
 331 class FlagSetting {
 332   bool val;
 333   bool* flag;
 334  public:
 335   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 336   ~FlagSetting()                       { *flag = val; }
 337 };
 338 
 339 
 340 class CounterSetting {
 341   intx* counter;
 342  public:
 343   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 344   ~CounterSetting()         { (*counter)--; }
 345 };
 346 
 347 
 348 class UIntFlagSetting {
 349   uintx val;
 350   uintx* flag;
 351  public:
 352   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 353   ~UIntFlagSetting()                         { *flag = val; }
 354 };
 355 
 356 
 357 class DoubleFlagSetting {
 358   double val;
 359   double* flag;
 360  public:
 361   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 362   ~DoubleFlagSetting()                           { *flag = val; }
 363 };
 364 
 365 
 366 class CommandLineFlags {
 367  public:
 368   static bool boolAt(const char* name, size_t len, bool* value);
 369   static bool boolAt(const char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 370   static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin);
 371   static bool boolAtPut(const char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 372 
 373   static bool intxAt(const char* name, size_t len, intx* value);
 374   static bool intxAt(const char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 375   static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin);
 376   static bool intxAtPut(const char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 377 
 378   static bool uintxAt(const char* name, size_t len, uintx* value);
 379   static bool uintxAt(const char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 380   static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin);
 381   static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 382 
 383   static bool uint64_tAt(const char* name, size_t len, uint64_t* value);
 384   static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 385   static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin);
 386   static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 387 
 388   static bool doubleAt(const char* name, size_t len, double* value);
 389   static bool doubleAt(const char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 390   static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin);
 391   static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 392 
 393   static bool ccstrAt(const char* name, size_t len, ccstr* value);
 394   static bool ccstrAt(const char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 395   // Contract:  Flag will make private copy of the incoming value.
 396   // Outgoing value is always malloc-ed, and caller MUST call free.
 397   static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin);
 398   static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 399 
 400   // Returns false if name is not a command line flag.
 401   static bool wasSetOnCmdline(const char* name, bool* value);
 402   static void printSetFlags(outputStream* out);
 403 
 404   static void printFlags(outputStream* out, bool withComments);
 405 
 406   static void verify() PRODUCT_RETURN;
 407 };
 408 
 409 // use this for flags that are true by default in the debug version but
 410 // false in the optimized version, and vice versa
 411 #ifdef ASSERT
 412 #define trueInDebug  true
 413 #define falseInDebug false
 414 #else
 415 #define trueInDebug  false
 416 #define falseInDebug true
 417 #endif
 418 
 419 // use this for flags that are true per default in the product build
 420 // but false in development builds, and vice versa
 421 #ifdef PRODUCT
 422 #define trueInProduct  true
 423 #define falseInProduct false
 424 #else
 425 #define trueInProduct  false
 426 #define falseInProduct true
 427 #endif
 428 
 429 #ifdef JAVASE_EMBEDDED
 430 #define falseInEmbedded false
 431 #else
 432 #define falseInEmbedded true
 433 #endif
 434 
 435 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 436 // product flags are always settable / visible
 437 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 438 
 439 // A flag must be declared with one of the following types:
 440 // bool, intx, uintx, ccstr.
 441 // The type "ccstr" is an alias for "const char*" and is used
 442 // only in this file, because the macrology requires single-token type names.
 443 
 444 // Note: Diagnostic options not meant for VM tuning or for product modes.
 445 // They are to be used for VM quality assurance or field diagnosis
 446 // of VM bugs.  They are hidden so that users will not be encouraged to
 447 // try them as if they were VM ordinary execution options.  However, they
 448 // are available in the product version of the VM.  Under instruction
 449 // from support engineers, VM customers can turn them on to collect
 450 // diagnostic information about VM problems.  To use a VM diagnostic
 451 // option, you must first specify +UnlockDiagnosticVMOptions.
 452 // (This master switch also affects the behavior of -Xprintflags.)
 453 //
 454 // experimental flags are in support of features that are not
 455 //    part of the officially supported product, but are available
 456 //    for experimenting with. They could, for example, be performance
 457 //    features that may not have undergone full or rigorous QA, but which may
 458 //    help performance in some cases and released for experimentation
 459 //    by the community of users and developers. This flag also allows one to
 460 //    be able to build a fully supported product that nonetheless also
 461 //    ships with some unsupported, lightly tested, experimental features.
 462 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 463 //    UnlockExperimentalVMOptions flag, which allows the control and
 464 //    modification of the experimental flags.
 465 //
 466 // Nota bene: neither diagnostic nor experimental options should be used casually,
 467 //    and they are not supported on production loads, except under explicit
 468 //    direction from support engineers.
 469 //
 470 // manageable flags are writeable external product flags.
 471 //    They are dynamically writeable through the JDK management interface
 472 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 473 //    These flags are external exported interface (see CCC).  The list of
 474 //    manageable flags can be queried programmatically through the management
 475 //    interface.
 476 //
 477 //    A flag can be made as "manageable" only if
 478 //    - the flag is defined in a CCC as an external exported interface.
 479 //    - the VM implementation supports dynamic setting of the flag.
 480 //      This implies that the VM must *always* query the flag variable
 481 //      and not reuse state related to the flag state at any given time.
 482 //    - you want the flag to be queried programmatically by the customers.
 483 //
 484 // product_rw flags are writeable internal product flags.
 485 //    They are like "manageable" flags but for internal/private use.
 486 //    The list of product_rw flags are internal/private flags which
 487 //    may be changed/removed in a future release.  It can be set
 488 //    through the management interface to get/set value
 489 //    when the name of flag is supplied.
 490 //
 491 //    A flag can be made as "product_rw" only if
 492 //    - the VM implementation supports dynamic setting of the flag.
 493 //      This implies that the VM must *always* query the flag variable
 494 //      and not reuse state related to the flag state at any given time.
 495 //
 496 // Note that when there is a need to support develop flags to be writeable,
 497 // it can be done in the same way as product_rw.
 498 
 499 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 500                                                                             \
 501   lp64_product(bool, UseCompressedOops, false,                              \
 502           "Use 32-bit object references in 64-bit VM. "                     \
 503           "lp64_product means flag is always constant in 32 bit VM")        \
 504                                                                             \
 505   lp64_product(bool, UseCompressedClassPointers, false,                     \
 506           "Use 32-bit class pointers in 64-bit VM. "                        \
 507           "lp64_product means flag is always constant in 32 bit VM")        \
 508                                                                             \
 509   notproduct(bool, CheckCompressedOops, true,                               \
 510           "Generate checks in encoding/decoding code in debug VM")          \
 511                                                                             \
 512   product_pd(uintx, HeapBaseMinAddress,                                     \
 513           "OS specific low limit for heap base address")                    \
 514                                                                             \
 515   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 516           "Print compressed oops base address and encoding mode")           \
 517                                                                             \
 518   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 519           "Default object alignment in bytes, 8 is minimum")                \
 520                                                                             \
 521   product(bool, AssumeMP, false,                                            \
 522           "Instruct the VM to assume multiple processors are available")    \
 523                                                                             \
 524   /* UseMembar is theoretically a temp flag used for memory barrier         \
 525    * removal testing.  It was supposed to be removed before FCS but has     \
 526    * been re-added (see 6401008) */                                         \
 527   product_pd(bool, UseMembar,                                               \
 528           "(Unstable) Issues membars on thread state transitions")          \
 529                                                                             \
 530   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 531           "Clean the chunk pool asynchronously")                            \
 532                                                                             \
 533   /* Temporary: See 6948537 */                                              \
 534   experimental(bool, UseMemSetInBOT, true,                                  \
 535           "(Unstable) uses memset in BOT updates in GC code")               \
 536                                                                             \
 537   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 538           "Enable normal processing of flags relating to field diagnostics")\
 539                                                                             \
 540   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 541           "Enable normal processing of flags relating to experimental "     \
 542           "features")                                                       \
 543                                                                             \
 544   product(bool, JavaMonitorsInStackTrace, true,                             \
 545           "Print information about Java monitor locks when the stacks are"  \
 546           "dumped")                                                         \
 547                                                                             \
 548   product_pd(bool, UseLargePages,                                           \
 549           "Use large page memory")                                          \
 550                                                                             \
 551   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 552           "Allocate large pages individually for better affinity")          \
 553                                                                             \
 554   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 555           "Fail large pages individual allocation")                         \
 556                                                                             \
 557   product(bool, UseLargePagesInMetaspace, false,                            \
 558           "Use large page memory in metaspace. "                            \
 559           "Only used if UseLargePages is enabled.")                         \
 560                                                                             \
 561   develop(bool, TracePageSizes, false,                                      \
 562           "Trace page size selection and usage")                            \
 563                                                                             \
 564   product(bool, UseNUMA, false,                                             \
 565           "Use NUMA if available")                                          \
 566                                                                             \
 567   product(bool, UseNUMAInterleaving, false,                                 \
 568           "Interleave memory across NUMA nodes if available")               \
 569                                                                             \
 570   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 571           "Granularity to use for NUMA interleaving on Windows OS")         \
 572                                                                             \
 573   product(bool, ForceNUMA, false,                                           \
 574           "Force NUMA optimizations on single-node/UMA systems")            \
 575                                                                             \
 576   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 577           "Percentage (0-100) used to weigh the current sample when "       \
 578           "computing exponentially decaying average for "                   \
 579           "AdaptiveNUMAChunkSizing")                                        \
 580                                                                             \
 581   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 582           "Do not reallocate more than this amount per collection")         \
 583                                                                             \
 584   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 585           "Enable adaptive chunk sizing for NUMA")                          \
 586                                                                             \
 587   product(bool, NUMAStats, false,                                           \
 588           "Print NUMA stats in detailed heap information")                  \
 589                                                                             \
 590   product(uintx, NUMAPageScanRate, 256,                                     \
 591           "Maximum number of pages to include in the page scan procedure")  \
 592                                                                             \
 593   product_pd(bool, NeedsDeoptSuspend,                                       \
 594           "True for register window machines (sparc/ia64)")                 \
 595                                                                             \
 596   product(intx, UseSSE, 99,                                                 \
 597           "Highest supported SSE instructions set on x86/x64")              \
 598                                                                             \
 599   product(bool, UseAES, false,                                              \
 600           "Control whether AES instructions can be used on x86/x64")        \
 601                                                                             \
 602   product(bool, UseSHA, false,                                              \
 603           "Control whether SHA instructions can be used on SPARC")          \
 604                                                                             \
 605   product(bool, UseGHASHIntrinsics, false,                                  \
 606           "Use intrinsics for GHASH versions of crypto")                    \
 607                                                                             \
 608   product(uintx, LargePageSizeInBytes, 0,                                   \
 609           "Large page size (0 to let VM choose the page size)")             \
 610                                                                             \
 611   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 612           "Use large pages if maximum heap is at least this big")           \
 613                                                                             \
 614   product(bool, ForceTimeHighResolution, false,                             \
 615           "Using high time resolution (for Win32 only)")                    \
 616                                                                             \
 617   develop(bool, TraceItables, false,                                        \
 618           "Trace initialization and use of itables")                        \
 619                                                                             \
 620   develop(bool, TracePcPatching, false,                                     \
 621           "Trace usage of frame::patch_pc")                                 \
 622                                                                             \
 623   develop(bool, TraceJumps, false,                                          \
 624           "Trace assembly jumps in thread ring buffer")                     \
 625                                                                             \
 626   develop(bool, TraceRelocator, false,                                      \
 627           "Trace the bytecode relocator")                                   \
 628                                                                             \
 629   develop(bool, TraceLongCompiles, false,                                   \
 630           "Print out every time compilation is longer than "                \
 631           "a given threshold")                                              \
 632                                                                             \
 633   develop(bool, SafepointALot, false,                                       \
 634           "Generate a lot of safepoints. This works with "                  \
 635           "GuaranteedSafepointInterval")                                    \
 636                                                                             \
 637   product_pd(bool, BackgroundCompilation,                                   \
 638           "A thread requesting compilation is not blocked during "          \
 639           "compilation")                                                    \
 640                                                                             \
 641   product(bool, PrintVMQWaitTime, false,                                    \
 642           "Print out the waiting time in VM operation queue")               \
 643                                                                             \
 644   develop(bool, NoYieldsInMicrolock, false,                                 \
 645           "Disable yields in microlock")                                    \
 646                                                                             \
 647   develop(bool, TraceOopMapGeneration, false,                               \
 648           "Show OopMapGeneration")                                          \
 649                                                                             \
 650   product(bool, MethodFlushing, true,                                       \
 651           "Reclamation of zombie and not-entrant methods")                  \
 652                                                                             \
 653   develop(bool, VerifyStack, false,                                         \
 654           "Verify stack of each thread when it is entering a runtime call") \
 655                                                                             \
 656   diagnostic(bool, ForceUnreachable, false,                                 \
 657           "Make all non code cache addresses to be unreachable by "         \
 658           "forcing use of 64bit literal fixups")                            \
 659                                                                             \
 660   notproduct(bool, StressDerivedPointers, false,                            \
 661           "Force scavenge when a derived pointer is detected on stack "     \
 662           "after rtm call")                                                 \
 663                                                                             \
 664   develop(bool, TraceDerivedPointers, false,                                \
 665           "Trace traversal of derived pointers on stack")                   \
 666                                                                             \
 667   notproduct(bool, TraceCodeBlobStacks, false,                              \
 668           "Trace stack-walk of codeblobs")                                  \
 669                                                                             \
 670   product(bool, PrintJNIResolving, false,                                   \
 671           "Used to implement -v:jni")                                       \
 672                                                                             \
 673   notproduct(bool, PrintRewrites, false,                                    \
 674           "Print methods that are being rewritten")                         \
 675                                                                             \
 676   product(bool, UseInlineCaches, true,                                      \
 677           "Use Inline Caches for virtual calls ")                           \
 678                                                                             \
 679   develop(bool, InlineArrayCopy, true,                                      \
 680           "Inline arraycopy native that is known to be part of "            \
 681           "base library DLL")                                               \
 682                                                                             \
 683   develop(bool, InlineObjectHash, true,                                     \
 684           "Inline Object::hashCode() native that is known to be part "      \
 685           "of base library DLL")                                            \
 686                                                                             \
 687   develop(bool, InlineNatives, true,                                        \
 688           "Inline natives that are known to be part of base library DLL")   \
 689                                                                             \
 690   develop(bool, InlineMathNatives, true,                                    \
 691           "Inline SinD, CosD, etc.")                                        \
 692                                                                             \
 693   develop(bool, InlineClassNatives, true,                                   \
 694           "Inline Class.isInstance, etc")                                   \
 695                                                                             \
 696   develop(bool, InlineThreadNatives, true,                                  \
 697           "Inline Thread.currentThread, etc")                               \
 698                                                                             \
 699   develop(bool, InlineUnsafeOps, true,                                      \
 700           "Inline memory ops (native methods) from sun.misc.Unsafe")        \
 701                                                                             \
 702   product(bool, CriticalJNINatives, true,                                   \
 703           "Check for critical JNI entry points")                            \
 704                                                                             \
 705   notproduct(bool, StressCriticalJNINatives, false,                         \
 706           "Exercise register saving code in critical natives")              \
 707                                                                             \
 708   product(bool, UseSSE42Intrinsics, false,                                  \
 709           "SSE4.2 versions of intrinsics")                                  \
 710                                                                             \
 711   product(bool, UseAESIntrinsics, false,                                    \
 712           "Use intrinsics for AES versions of crypto")                      \
 713                                                                             \
 714   product(bool, UseSHA1Intrinsics, false,                                   \
 715           "Use intrinsics for SHA-1 crypto hash function")                  \
 716                                                                             \
 717   product(bool, UseSHA256Intrinsics, false,                                 \
 718           "Use intrinsics for SHA-224 and SHA-256 crypto hash functions")   \
 719                                                                             \
 720   product(bool, UseSHA512Intrinsics, false,                                 \
 721           "Use intrinsics for SHA-384 and SHA-512 crypto hash functions")   \
 722                                                                             \
 723   product(bool, UseCRC32Intrinsics, false,                                  \
 724           "use intrinsics for java.util.zip.CRC32")                         \
 725                                                                             \
 726   develop(bool, TraceCallFixup, false,                                      \
 727           "Trace all call fixups")                                          \
 728                                                                             \
 729   develop(bool, DeoptimizeALot, false,                                      \
 730           "Deoptimize at every exit from the runtime system")               \
 731                                                                             \
 732   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 733           "A comma separated list of bcis to deoptimize at")                \
 734                                                                             \
 735   product(bool, DeoptimizeRandom, false,                                    \
 736           "Deoptimize random frames on random exit from the runtime system")\
 737                                                                             \
 738   notproduct(bool, ZombieALot, false,                                       \
 739           "Create zombies (non-entrant) at exit from the runtime system")   \
 740                                                                             \
 741   product(bool, UnlinkSymbolsALot, false,                                   \
 742           "Unlink unreferenced symbols from the symbol table at safepoints")\
 743                                                                             \
 744   notproduct(bool, WalkStackALot, false,                                    \
 745           "Trace stack (no print) at every exit from the runtime system")   \
 746                                                                             \
 747   product(bool, Debugging, false,                                           \
 748           "Set when executing debug methods in debug.cpp "                  \
 749           "(to prevent triggering assertions)")                             \
 750                                                                             \
 751   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 752           "Enable strict checks that safepoints cannot happen for threads " \
 753           "that use No_Safepoint_Verifier")                                 \
 754                                                                             \
 755   notproduct(bool, VerifyLastFrame, false,                                  \
 756           "Verify oops on last frame on entry to VM")                       \
 757                                                                             \
 758   develop(bool, TraceHandleAllocation, false,                               \
 759           "Print out warnings when suspiciously many handles are allocated")\
 760                                                                             \
 761   product(bool, UseCompilerSafepoints, true,                                \
 762           "Stop at safepoints in compiled code")                            \
 763                                                                             \
 764   product(bool, FailOverToOldVerifier, true,                                \
 765           "Fail over to old verifier when split verifier fails")            \
 766                                                                             \
 767   develop(bool, ShowSafepointMsgs, false,                                   \
 768           "Show message about safepoint synchronization")                   \
 769                                                                             \
 770   product(bool, SafepointTimeout, false,                                    \
 771           "Time out and warn or fail after SafepointTimeoutDelay "          \
 772           "milliseconds if failed to reach safepoint")                      \
 773                                                                             \
 774   diagnostic(bool, AbortVMOnSafepointTimeout, false,                        \
 775           "Abort upon failure to reach safepoint (see SafepointTimeout)")   \
 776                                                                             \
 777   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 778   /* typically, at most a few retries are needed */                         \
 779   product(intx, SuspendRetryCount, 50,                                      \
 780           "Maximum retry count for an external suspend request")            \
 781                                                                             \
 782   product(intx, SuspendRetryDelay, 5,                                       \
 783           "Milliseconds to delay per retry (* current_retry_count)")        \
 784                                                                             \
 785   product(bool, AssertOnSuspendWaitFailure, false,                          \
 786           "Assert/Guarantee on external suspend wait failure")              \
 787                                                                             \
 788   product(bool, TraceSuspendWaitFailures, false,                            \
 789           "Trace external suspend wait failures")                           \
 790                                                                             \
 791   product(bool, MaxFDLimit, true,                                           \
 792           "Bump the number of file descriptors to maximum in Solaris")      \
 793                                                                             \
 794   diagnostic(bool, LogEvents, true,                                         \
 795           "Enable the various ring buffer event logs")                      \
 796                                                                             \
 797   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 798           "Number of ring buffer event logs")                               \
 799                                                                             \
 800   product(bool, BytecodeVerificationRemote, true,                           \
 801           "Enable the Java bytecode verifier for remote classes")           \
 802                                                                             \
 803   product(bool, BytecodeVerificationLocal, false,                           \
 804           "Enable the Java bytecode verifier for local classes")            \
 805                                                                             \
 806   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 807           "Force exceptions on FP stack under/overflow")                    \
 808                                                                             \
 809   develop(bool, VerifyStackAtCalls, false,                                  \
 810           "Verify that the stack pointer is unchanged after calls")         \
 811                                                                             \
 812   develop(bool, TraceJavaAssertions, false,                                 \
 813           "Trace java language assertions")                                 \
 814                                                                             \
 815   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 816           "Temporary - see javaClasses.cpp")                                \
 817                                                                             \
 818   notproduct(bool, PrintMallocFree, false,                                  \
 819           "Trace calls to C heap malloc/free allocation")                   \
 820                                                                             \
 821   product(bool, PrintOopAddress, false,                                     \
 822           "Always print the location of the oop")                           \
 823                                                                             \
 824   notproduct(bool, VerifyCodeCacheOften, false,                             \
 825           "Verify compiled-code cache often")                               \
 826                                                                             \
 827   develop(bool, ZapDeadCompiledLocals, false,                               \
 828           "Zap dead locals in compiler frames")                             \
 829                                                                             \
 830   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 831           "Zap dead locals (old version, zaps all frames when "             \
 832           "entering the VM")                                                \
 833                                                                             \
 834   notproduct(bool, CheckOopishValues, false,                                \
 835           "Warn if value contains oop (requires ZapDeadLocals)")            \
 836                                                                             \
 837   develop(bool, UseMallocOnly, false,                                       \
 838           "Use only malloc/free for allocation (no resource area/arena)")   \
 839                                                                             \
 840   develop(bool, PrintMalloc, false,                                         \
 841           "Print all malloc/free calls")                                    \
 842                                                                             \
 843   develop(bool, PrintMallocStatistics, false,                               \
 844           "Print malloc/free statistics")                                   \
 845                                                                             \
 846   develop(bool, ZapResourceArea, trueInDebug,                               \
 847           "Zap freed resource/arena space with 0xABABABAB")                 \
 848                                                                             \
 849   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 850           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 851                                                                             \
 852   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 853           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 854                                                                             \
 855   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 856           "Zap allocated/freed stack segments with 0xFADFADED")             \
 857                                                                             \
 858   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 859           "Zap unused heap space with 0xBAADBABE")                          \
 860                                                                             \
 861   develop(bool, TraceZapUnusedHeapArea, false,                              \
 862           "Trace zapping of unused heap space")                             \
 863                                                                             \
 864   develop(bool, CheckZapUnusedHeapArea, false,                              \
 865           "Check zapping of unused heap space")                             \
 866                                                                             \
 867   develop(bool, ZapFillerObjects, trueInDebug,                              \
 868           "Zap filler objects with 0xDEAFBABE")                             \
 869                                                                             \
 870   develop(bool, PrintVMMessages, true,                                      \
 871           "Print VM messages on console")                                   \
 872                                                                             \
 873   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 874           "Print the time the application has been running")                \
 875                                                                             \
 876   product(bool, PrintGCApplicationStoppedTime, false,                       \
 877           "Print the time the application has been stopped")                \
 878                                                                             \
 879   diagnostic(bool, VerboseVerification, false,                              \
 880           "Display detailed verification details")                          \
 881                                                                             \
 882   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 883           "If > 0, provokes an error after VM initialization; the value "   \
 884           "determines which error to provoke. See test_error_handler() "    \
 885           "in debug.cpp.")                                                  \
 886                                                                             \
 887   develop(bool, Verbose, false,                                             \
 888           "Print additional debugging information from other modes")        \
 889                                                                             \
 890   develop(bool, PrintMiscellaneous, false,                                  \
 891           "Print uncategorized debugging information (requires +Verbose)")  \
 892                                                                             \
 893   develop(bool, WizardMode, false,                                          \
 894           "Print much more debugging information")                          \
 895                                                                             \
 896   product(bool, ShowMessageBoxOnError, false,                               \
 897           "Keep process alive on VM fatal error")                           \
 898                                                                             \
 899   product(bool, CreateMinidumpOnCrash, false,                               \
 900           "Create minidump on VM fatal error")                              \
 901                                                                             \
 902   product_pd(bool, UseOSErrorReporting,                                     \
 903           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 904                                                                             \
 905   product(bool, SuppressFatalErrorMessage, false,                           \
 906           "Report NO fatal error message (avoid deadlock)")                 \
 907                                                                             \
 908   product(ccstrlist, OnError, "",                                           \
 909           "Run user-defined commands on fatal error; see VMError.cpp "      \
 910           "for examples")                                                   \
 911                                                                             \
 912   product(ccstrlist, OnOutOfMemoryError, "",                                \
 913           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 914                                                                             \
 915   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 916           "Dump heap to file before any major stop-the-world GC")           \
 917                                                                             \
 918   manageable(bool, HeapDumpAfterFullGC, false,                              \
 919           "Dump heap to file after any major stop-the-world GC")            \
 920                                                                             \
 921   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 922           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 923                                                                             \
 924   manageable(ccstr, HeapDumpPath, NULL,                                     \
 925           "When HeapDumpOnOutOfMemoryError is on, the path (filename or "   \
 926           "directory) of the dump file (defaults to java_pid<pid>.hprof "   \
 927           "in the working directory)")                                      \
 928                                                                             \
 929   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 930           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 931           "when the heap usage is larger than this")                        \
 932                                                                             \
 933   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 934           "Approximate segment size when generating a segmented heap dump") \
 935                                                                             \
 936   develop(bool, BreakAtWarning, false,                                      \
 937           "Execute breakpoint upon encountering VM warning")                \
 938                                                                             \
 939   develop(bool, TraceVMOperation, false,                                    \
 940           "Trace VM operations")                                            \
 941                                                                             \
 942   develop(bool, UseFakeTimers, false,                                       \
 943           "Tell whether the VM should use system time or a fake timer")     \
 944                                                                             \
 945   product(ccstr, NativeMemoryTracking, "off",                               \
 946           "Native memory tracking options")                                 \
 947                                                                             \
 948   diagnostic(bool, PrintNMTStatistics, false,                               \
 949           "Print native memory tracking summary data if it is on")          \
 950                                                                             \
 951   diagnostic(bool, LogCompilation, false,                                   \
 952           "Log compilation activity in detail to LogFile")                  \
 953                                                                             \
 954   product(bool, PrintCompilation, false,                                    \
 955           "Print compilations")                                             \
 956                                                                             \
 957   diagnostic(bool, TraceNMethodInstalls, false,                             \
 958           "Trace nmethod installation")                                     \
 959                                                                             \
 960   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 961           "0: do not allow scavengable oops in the code cache; "            \
 962           "1: allow scavenging from the code cache; "                       \
 963           "2: emit as many constants as the compiler can see")              \
 964                                                                             \
 965   product(bool, AlwaysRestoreFPU, false,                                    \
 966           "Restore the FPU control word after every JNI call (expensive)")  \
 967                                                                             \
 968   diagnostic(bool, PrintCompilation2, false,                                \
 969           "Print additional statistics per compilation")                    \
 970                                                                             \
 971   diagnostic(bool, PrintAdapterHandlers, false,                             \
 972           "Print code generated for i2c/c2i adapters")                      \
 973                                                                             \
 974   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 975           "Verify that i2c/c2i adapters are called properly")               \
 976                                                                             \
 977   develop(bool, VerifyAdapterSharing, false,                                \
 978           "Verify that the code for shared adapters is the equivalent")     \
 979                                                                             \
 980   diagnostic(bool, PrintAssembly, false,                                    \
 981           "Print assembly code (using external disassembler.so)")           \
 982                                                                             \
 983   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 984           "Print options string passed to disassembler.so")                 \
 985                                                                             \
 986   diagnostic(bool, PrintNMethods, false,                                    \
 987           "Print assembly code for nmethods when generated")                \
 988                                                                             \
 989   diagnostic(bool, PrintNativeNMethods, false,                              \
 990           "Print assembly code for native nmethods when generated")         \
 991                                                                             \
 992   develop(bool, PrintDebugInfo, false,                                      \
 993           "Print debug information for all nmethods when generated")        \
 994                                                                             \
 995   develop(bool, PrintRelocations, false,                                    \
 996           "Print relocation information for all nmethods when generated")   \
 997                                                                             \
 998   develop(bool, PrintDependencies, false,                                   \
 999           "Print dependency information for all nmethods when generated")   \
1000                                                                             \
1001   develop(bool, PrintExceptionHandlers, false,                              \
1002           "Print exception handler tables for all nmethods when generated") \
1003                                                                             \
1004   develop(bool, StressCompiledExceptionHandlers, false,                     \
1005           "Exercise compiled exception handlers")                           \
1006                                                                             \
1007   develop(bool, InterceptOSException, false,                                \
1008           "Start debugger when an implicit OS (e.g. NULL) "                 \
1009           "exception happens")                                              \
1010                                                                             \
1011   product(bool, PrintCodeCache, false,                                      \
1012           "Print the code cache memory usage when exiting")                 \
1013                                                                             \
1014   develop(bool, PrintCodeCache2, false,                                     \
1015           "Print detailed usage information on the code cache when exiting")\
1016                                                                             \
1017   product(bool, PrintCodeCacheOnCompilation, false,                         \
1018           "Print the code cache memory usage each time a method is "        \
1019           "compiled")                                                       \
1020                                                                             \
1021   diagnostic(bool, PrintStubCode, false,                                    \
1022           "Print generated stub code")                                      \
1023                                                                             \
1024   product(bool, StackTraceInThrowable, true,                                \
1025           "Collect backtrace in throwable when exception happens")          \
1026                                                                             \
1027   product(bool, OmitStackTraceInFastThrow, true,                            \
1028           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1029                                                                             \
1030   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1031           "Print bytecode statistics when dumping profiler output")         \
1032                                                                             \
1033   product(bool, ProfilerRecordPC, false,                                    \
1034           "Collect ticks for each 16 byte interval of compiled code")       \
1035                                                                             \
1036   product(bool, ProfileVM, false,                                           \
1037           "Profile ticks that fall within VM (either in the VM Thread "     \
1038           "or VM code called through stubs)")                               \
1039                                                                             \
1040   product(bool, ProfileIntervals, false,                                    \
1041           "Print profiles for each interval (see ProfileIntervalsTicks)")   \
1042                                                                             \
1043   notproduct(bool, ProfilerCheckIntervals, false,                           \
1044           "Collect and print information on spacing of profiler ticks")     \
1045                                                                             \
1046   develop(bool, PrintJVMWarnings, false,                                    \
1047           "Print warnings for unimplemented JVM functions")                 \
1048                                                                             \
1049   product(bool, PrintWarnings, true,                                        \
1050           "Print JVM warnings to output stream")                            \
1051                                                                             \
1052   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1053           "Print warnings for stalled SpinLocks")                           \
1054                                                                             \
1055   product(bool, RegisterFinalizersAtInit, true,                             \
1056           "Register finalizable objects at end of Object.<init> or "        \
1057           "after allocation")                                               \
1058                                                                             \
1059   develop(bool, RegisterReferences, true,                                   \
1060           "Tell whether the VM should register soft/weak/final/phantom "    \
1061           "references")                                                     \
1062                                                                             \
1063   develop(bool, IgnoreRewrites, false,                                      \
1064           "Suppress rewrites of bytecodes in the oopmap generator. "        \
1065           "This is unsafe!")                                                \
1066                                                                             \
1067   develop(bool, PrintCodeCacheExtension, false,                             \
1068           "Print extension of code cache")                                  \
1069                                                                             \
1070   develop(bool, UsePrivilegedStack, true,                                   \
1071           "Enable the security JVM functions")                              \
1072                                                                             \
1073   develop(bool, ProtectionDomainVerification, true,                         \
1074           "Verify protection domain before resolution in system dictionary")\
1075                                                                             \
1076   product(bool, ClassUnloading, true,                                       \
1077           "Do unloading of classes")                                        \
1078                                                                             \
1079   product(bool, ClassUnloadingWithConcurrentMark, true,                     \
1080           "Do unloading of classes with a concurrent marking cycle")        \
1081                                                                             \
1082   develop(bool, DisableStartThread, false,                                  \
1083           "Disable starting of additional Java threads "                    \
1084           "(for debugging only)")                                           \
1085                                                                             \
1086   develop(bool, MemProfiling, false,                                        \
1087           "Write memory usage profiling to log file")                       \
1088                                                                             \
1089   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1090           "Print the system dictionary at exit")                            \
1091                                                                             \
1092   experimental(intx, PredictedLoadedClassCount, 0,                          \
1093           "Experimental: Tune loaded class cache starting size")            \
1094                                                                             \
1095   diagnostic(bool, UnsyncloadClass, false,                                  \
1096           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1097           "class loader must call VM synchronized for findClass "           \
1098           "and defineClass.")                                               \
1099                                                                             \
1100   product(bool, AlwaysLockClassLoader, false,                               \
1101           "Require the VM to acquire the class loader lock before calling " \
1102           "loadClass() even for class loaders registering "                 \
1103           "as parallel capable")                                            \
1104                                                                             \
1105   product(bool, AllowParallelDefineClass, false,                            \
1106           "Allow parallel defineClass requests for class loaders "          \
1107           "registering as parallel capable")                                \
1108                                                                             \
1109   product(bool, MustCallLoadClassInternal, false,                           \
1110           "Call loadClassInternal() rather than loadClass()")               \
1111                                                                             \
1112   product_pd(bool, DontYieldALot,                                           \
1113           "Throw away obvious excess yield calls (for Solaris only)")       \
1114                                                                             \
1115   product_pd(bool, ConvertSleepToYield,                                     \
1116           "Convert sleep(0) to thread yield "                               \
1117           "(may be off for Solaris to improve GUI)")                        \
1118                                                                             \
1119   product(bool, ConvertYieldToSleep, false,                                 \
1120           "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \
1121           "behavior (Solaris only)")                                        \
1122                                                                             \
1123   product(bool, UseBoundThreads, true,                                      \
1124           "Bind user level threads to kernel threads (for Solaris only)")   \
1125                                                                             \
1126   develop(bool, UseDetachedThreads, true,                                   \
1127           "Use detached threads that are recycled upon termination "        \
1128           "(for Solaris only)")                                             \
1129                                                                             \
1130   experimental(bool, DisablePrimordialThreadGuardPages, false,              \
1131                "Disable the use of stack guard pages if the JVM is loaded " \
1132                "on the primordial process thread")                          \
1133                                                                             \
1134   product(bool, UseLWPSynchronization, true,                                \
1135           "Use LWP-based instead of libthread-based synchronization "       \
1136           "(SPARC only)")                                                   \
1137                                                                             \
1138   product(ccstr, SyncKnobs, NULL,                                           \
1139           "(Unstable) Various monitor synchronization tunables")            \
1140                                                                             \
1141   product(intx, EmitSync, 0,                                                \
1142           "(Unsafe, Unstable) "                                             \
1143           "Control emission of inline sync fast-path code")                 \
1144                                                                             \
1145   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1146                                                                             \
1147   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1148                                                                             \
1149   product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \
1150                                                                             \
1151   product(intx, SyncVerbose, 0, "(Unstable)")                               \
1152                                                                             \
1153   product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)")                    \
1154                                                                             \
1155   product(intx, hashCode, 5,                                                \
1156           "(Unstable) select hashCode generation algorithm")                \
1157                                                                             \
1158   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1159           "(Unstable, Linux-specific) "                                     \
1160           "avoid NPTL-FUTEX hang pthread_cond_timedwait")                   \
1161                                                                             \
1162   product(bool, FilterSpuriousWakeups, true,                                \
1163           "Prevent spurious or premature wakeups from object.wait "         \
1164           "(Solaris only)")                                                 \
1165                                                                             \
1166   experimental(intx, NativeMonitorTimeout, -1, "(Unstable)")                \
1167                                                                             \
1168   experimental(intx, NativeMonitorFlags, 0, "(Unstable)")                   \
1169                                                                             \
1170   experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)")              \
1171                                                                             \
1172   develop(bool, UsePthreads, false,                                         \
1173           "Use pthread-based instead of libthread-based synchronization "   \
1174           "(SPARC only)")                                                   \
1175                                                                             \
1176   product(bool, AdjustConcurrency, false,                                   \
1177           "Call thr_setconcurrency at thread creation time to avoid "       \
1178           "LWP starvation on MP systems (for Solaris Only)")                \
1179                                                                             \
1180   product(bool, ReduceSignalUsage, false,                                   \
1181           "Reduce the use of OS signals in Java and/or the VM")             \
1182                                                                             \
1183   develop_pd(bool, ShareVtableStubs,                                        \
1184           "Share vtable stubs (smaller code but worse branch prediction")   \
1185                                                                             \
1186   develop(bool, LoadLineNumberTables, true,                                 \
1187           "Tell whether the class file parser loads line number tables")    \
1188                                                                             \
1189   develop(bool, LoadLocalVariableTables, true,                              \
1190           "Tell whether the class file parser loads local variable tables") \
1191                                                                             \
1192   develop(bool, LoadLocalVariableTypeTables, true,                          \
1193           "Tell whether the class file parser loads local variable type"    \
1194           "tables")                                                         \
1195                                                                             \
1196   product(bool, AllowUserSignalHandlers, false,                             \
1197           "Do not complain if the application installs signal handlers "    \
1198           "(Solaris & Linux only)")                                         \
1199                                                                             \
1200   product(bool, UseSignalChaining, true,                                    \
1201           "Use signal-chaining to invoke signal handlers installed "        \
1202           "by the application (Solaris & Linux only)")                      \
1203                                                                             \
1204   product(bool, UseAltSigs, false,                                          \
1205           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1206           "internal signals (Solaris only)")                                \
1207                                                                             \
1208   product(bool, AllowJNIEnvProxy, false,                                    \
1209           "Allow JNIEnv proxies for jdbx")                                  \
1210                                                                             \
1211   product(bool, JNIDetachReleasesMonitors, true,                            \
1212           "JNI DetachCurrentThread releases monitors owned by thread")      \
1213                                                                             \
1214   product(bool, RestoreMXCSROnJNICalls, false,                              \
1215           "Restore MXCSR when returning from JNI calls")                    \
1216                                                                             \
1217   product(bool, CheckJNICalls, false,                                       \
1218           "Verify all arguments to JNI calls")                              \
1219                                                                             \
1220   product(bool, CheckEndorsedAndExtDirs, false,                             \
1221           "Verify the endorsed and extension directories are not used")     \
1222                                                                             \
1223   product(bool, UseFastJNIAccessors, true,                                  \
1224           "Use optimized versions of Get<Primitive>Field")                  \
1225                                                                             \
1226   product(intx, MaxJNILocalCapacity, 65536,                                 \
1227           "Maximum allowable local JNI handle capacity to "                 \
1228           "EnsureLocalCapacity() and PushLocalFrame(), "                    \
1229           "where <= 0 is unlimited, default: 65536")                        \
1230                                                                             \
1231   product(bool, EagerXrunInit, false,                                       \
1232           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1233           "but not all -Xrun libraries may support the state of the VM "    \
1234           "at this time")                                                   \
1235                                                                             \
1236   product(bool, PreserveAllAnnotations, false,                              \
1237           "Preserve RuntimeInvisibleAnnotations as well "                   \
1238           "as RuntimeVisibleAnnotations")                                   \
1239                                                                             \
1240   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1241           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1242                                                                             \
1243   product(bool, LazyBootClassLoader, true,                                  \
1244           "Enable/disable lazy opening of boot class path entries")         \
1245                                                                             \
1246   product(bool, UseXMMForArrayCopy, false,                                  \
1247           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1248                                                                             \
1249   product(intx, FieldsAllocationStyle, 1,                                   \
1250           "0 - type based with oops first, 1 - with oops last, "            \
1251           "2 - oops in super and sub classes are together")                 \
1252                                                                             \
1253   product(bool, CompactFields, true,                                        \
1254           "Allocate nonstatic fields in gaps between previous fields")      \
1255                                                                             \
1256   notproduct(bool, PrintFieldLayout, false,                                 \
1257           "Print field layout for each class")                              \
1258                                                                             \
1259   product(intx, ContendedPaddingWidth, 128,                                 \
1260           "How many bytes to pad the fields/classes marked @Contended with")\
1261                                                                             \
1262   product(bool, EnableContended, true,                                      \
1263           "Enable @Contended annotation support")                           \
1264                                                                             \
1265   product(bool, RestrictContended, true,                                    \
1266           "Restrict @Contended to trusted classes")                         \
1267                                                                             \
1268   product(bool, UseBiasedLocking, true,                                     \
1269           "Enable biased locking in JVM")                                   \
1270                                                                             \
1271   product(intx, BiasedLockingStartupDelay, 4000,                            \
1272           "Number of milliseconds to wait before enabling biased locking")  \
1273                                                                             \
1274   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1275           "Print statistics of biased locking in JVM")                      \
1276                                                                             \
1277   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1278           "Threshold of number of revocations per type to try to "          \
1279           "rebias all objects in the heap of that type")                    \
1280                                                                             \
1281   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1282           "Threshold of number of revocations per type to permanently "     \
1283           "revoke biases of all objects in the heap of that type")          \
1284                                                                             \
1285   product(intx, BiasedLockingDecayTime, 25000,                              \
1286           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1287           "type after previous bulk rebias")                                \
1288                                                                             \
1289   product(bool, ExitOnOutOfMemoryError, false,                              \
1290           "JVM exits on the first occurrence of an out-of-memory error")    \
1291                                                                             \
1292   product(bool, CrashOnOutOfMemoryError, false,                             \
1293           "JVM aborts, producing an error log and core/mini dump, on the "  \
1294           "first occurrence of an out-of-memory error")                     \
1295                                                                             \
1296   /* tracing */                                                             \
1297                                                                             \
1298   notproduct(bool, TraceRuntimeCalls, false,                                \
1299           "Trace run-time calls")                                           \
1300                                                                             \
1301   develop(bool, TraceJNICalls, false,                                       \
1302           "Trace JNI calls")                                                \
1303                                                                             \
1304   develop(bool, StressRewriter, false,                                      \
1305           "Stress linktime bytecode rewriting")                             \
1306                                                                             \
1307   notproduct(bool, TraceJVMCalls, false,                                    \
1308           "Trace JVM calls")                                                \
1309                                                                             \
1310   product(ccstr, TraceJVMTI, NULL,                                          \
1311           "Trace flags for JVMTI functions and events")                     \
1312                                                                             \
1313   /* This option can change an EMCP method into an obsolete method. */      \
1314   /* This can affect tests that except specific methods to be EMCP. */      \
1315   /* This option should be used with caution. */                            \
1316   product(bool, StressLdcRewrite, false,                                    \
1317           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1318                                                                             \
1319   product(intx, TraceRedefineClasses, 0,                                    \
1320           "Trace level for JVMTI RedefineClasses")                          \
1321                                                                             \
1322   develop(bool, StressMethodComparator, false,                              \
1323           "Run the MethodComparator on all loaded methods")                 \
1324                                                                             \
1325   /* change to false by default sometime after Mustang */                   \
1326   product(bool, VerifyMergedCPBytecodes, true,                              \
1327           "Verify bytecodes after RedefineClasses constant pool merging")   \
1328                                                                             \
1329   develop(bool, TraceJNIHandleAllocation, false,                            \
1330           "Trace allocation/deallocation of JNI handle blocks")             \
1331                                                                             \
1332   develop(bool, TraceThreadEvents, false,                                   \
1333           "Trace all thread events")                                        \
1334                                                                             \
1335   develop(bool, TraceBytecodes, false,                                      \
1336           "Trace bytecode execution")                                       \
1337                                                                             \
1338   develop(bool, TraceClassInitialization, false,                            \
1339           "Trace class initialization")                                     \
1340                                                                             \
1341   develop(bool, TraceExceptions, false,                                     \
1342           "Trace exceptions")                                               \
1343                                                                             \
1344   develop(bool, TraceICs, false,                                            \
1345           "Trace inline cache changes")                                     \
1346                                                                             \
1347   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1348           "Trace method invocation counter overflow")                       \
1349                                                                             \
1350   develop(bool, TraceInlineCacheClearing, false,                            \
1351           "Trace clearing of inline caches in nmethods")                    \
1352                                                                             \
1353   develop(bool, TraceDependencies, false,                                   \
1354           "Trace dependencies")                                             \
1355                                                                             \
1356   develop(bool, VerifyDependencies, trueInDebug,                            \
1357           "Exercise and verify the compilation dependency mechanism")       \
1358                                                                             \
1359   develop(bool, TraceNewOopMapGeneration, false,                            \
1360           "Trace OopMapGeneration")                                         \
1361                                                                             \
1362   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1363           "Trace OopMapGeneration: print detailed cell states")             \
1364                                                                             \
1365   develop(bool, TimeOopMap, false,                                          \
1366           "Time calls to GenerateOopMap::compute_map() in sum")             \
1367                                                                             \
1368   develop(bool, TimeOopMap2, false,                                         \
1369           "Time calls to GenerateOopMap::compute_map() individually")       \
1370                                                                             \
1371   develop(bool, TraceMonitorMismatch, false,                                \
1372           "Trace monitor matching failures during OopMapGeneration")        \
1373                                                                             \
1374   develop(bool, TraceOopMapRewrites, false,                                 \
1375           "Trace rewriting of method oops during oop map generation")       \
1376                                                                             \
1377   develop(bool, TraceSafepoint, false,                                      \
1378           "Trace safepoint operations")                                     \
1379                                                                             \
1380   develop(bool, TraceICBuffer, false,                                       \
1381           "Trace usage of IC buffer")                                       \
1382                                                                             \
1383   develop(bool, TraceCompiledIC, false,                                     \
1384           "Trace changes of compiled IC")                                   \
1385                                                                             \
1386   notproduct(bool, TraceZapDeadLocals, false,                               \
1387           "Trace zapping dead locals")                                      \
1388                                                                             \
1389   develop(bool, TraceStartupTime, false,                                    \
1390           "Trace setup time")                                               \
1391                                                                             \
1392   develop(bool, TraceProtectionDomainVerification, false,                   \
1393           "Trace protection domain verification")                           \
1394                                                                             \
1395   develop(bool, TraceClearedExceptions, false,                              \
1396           "Print when an exception is forcibly cleared")                    \
1397                                                                             \
1398   product(bool, TraceClassResolution, false,                                \
1399           "Trace all constant pool resolutions (for debugging)")            \
1400                                                                             \
1401   product(bool, TraceBiasedLocking, false,                                  \
1402           "Trace biased locking in JVM")                                    \
1403                                                                             \
1404   product(bool, TraceMonitorInflation, false,                               \
1405           "Trace monitor inflation in JVM")                                 \
1406                                                                             \
1407   /* gc */                                                                  \
1408                                                                             \
1409   product(bool, UseSerialGC, false,                                         \
1410           "Use the Serial garbage collector")                               \
1411                                                                             \
1412   product(bool, UseG1GC, false,                                             \
1413           "Use the Garbage-First garbage collector")                        \
1414                                                                             \
1415   product(bool, UseParallelGC, false,                                       \
1416           "Use the Parallel Scavenge garbage collector")                    \
1417                                                                             \
1418   product(bool, UseParallelOldGC, false,                                    \
1419           "Use the Parallel Old garbage collector")                         \
1420                                                                             \



1421   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1422           "How often should we maximally compact the heap (not allowing "   \
1423           "any dead space)")                                                \
1424                                                                             \
1425   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1426           "The collection count for the first maximum compaction")          \
1427                                                                             \
1428   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1429           "Use maximum compaction in the Parallel Old garbage collector "   \
1430           "for a system GC")                                                \
1431                                                                             \
1432   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1433           "The mean used by the parallel compact dead wood "                \
1434           "limiter (a number between 0-100)")                               \
1435                                                                             \
1436   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1437           "The standard deviation used by the parallel compact dead wood "  \
1438           "limiter (a number between 0-100)")                               \
1439                                                                             \
1440   product(uintx, ParallelGCThreads, 0,                                      \
1441           "Number of parallel threads parallel gc will use")                \
1442                                                                             \
1443   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1444           "Dynamically choose the number of parallel threads "              \
1445           "parallel gc will use")                                           \
1446                                                                             \
1447   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1448           "Force dynamic selection of the number of "                       \
1449           "parallel threads parallel gc will use to aid debugging")         \
1450                                                                             \
1451   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1452           "Size of heap (bytes) per GC thread used in calculating the "     \
1453           "number of GC threads")                                           \
1454                                                                             \
1455   product(bool, TraceDynamicGCThreads, false,                               \
1456           "Trace the dynamic GC thread usage")                              \
1457                                                                             \
1458   develop(bool, ParallelOldGCSplitALot, false,                              \
1459           "Provoke splitting (copying data from a young gen space to "      \
1460           "multiple destination spaces)")                                   \
1461                                                                             \
1462   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1463           "How often to provoke splitting a young gen space")               \
1464                                                                             \
1465   product(uintx, ConcGCThreads, 0,                                          \
1466           "Number of threads concurrent gc will use")                       \
1467                                                                             \
1468   product(uintx, YoungPLABSize, 4096,                                       \
1469           "Size of young gen promotion LAB's (in HeapWords)")               \
1470                                                                             \
1471   product(uintx, OldPLABSize, 1024,                                         \
1472           "Size of old gen promotion LAB's (in HeapWords)")                 \
1473                                                                             \
1474   product(uintx, GCTaskTimeStampEntries, 200,                               \
1475           "Number of time stamp entries per gc worker thread")              \
1476                                                                             \
1477   product(bool, AlwaysTenure, false,                                        \
1478           "Always tenure objects in eden (ParallelGC only)")                \
1479                                                                             \
1480   product(bool, NeverTenure, false,                                         \
1481           "Never tenure objects in eden, may tenure on overflow "           \
1482           "(ParallelGC only)")                                              \
1483                                                                             \
1484   product(bool, ScavengeBeforeFullGC, true,                                 \
1485           "Scavenge youngest generation before each full GC, "              \
1486           "used with UseParallelGC")                                        \
1487                                                                             \
1488   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1489           "Allow scavenges to occur when to-space contains objects")        \
1490                                                                             \
1491   product(bool, UseConcMarkSweepGC, false,                                  \
1492           "Use Concurrent Mark-Sweep GC in the old generation")             \
1493                                                                             \
1494   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1495           "A System.gc() request invokes a concurrent collection; "         \
1496           "(effective only when UseConcMarkSweepGC)")                       \
1497                                                                             \
1498   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1499           "A System.gc() request invokes a concurrent collection and "      \
1500           "also unloads classes during such a concurrent gc cycle "         \
1501           "(effective only when UseConcMarkSweepGC)")                       \
1502                                                                             \
1503   product(bool, GCLockerInvokesConcurrent, false,                           \
1504           "The exit of a JNI critical section necessitating a scavenge, "   \
1505           "also kicks off a background concurrent collection")              \
1506                                                                             \
1507   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1508           "How much the GC can expand the eden by while the GC locker "     \
1509           "is active (as a percentage)")                                    \
1510                                                                             \
1511   diagnostic(uintx, GCLockerRetryAllocationCount, 2,                        \
1512           "Number of times to retry allocations when "                      \
1513           "blocked by the GC locker")                                       \
1514                                                                             \
1515   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1516           "Use adaptive free lists in the CMS generation")                  \
1517                                                                             \
1518   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1519           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1520                                                                             \
1521   develop(bool, RotateCMSCollectionTypes, false,                            \
1522           "Rotate the CMS collections among concurrent and STW")            \
1523                                                                             \
1524   product(bool, UseCMSBestFit, true,                                        \
1525           "Use CMS best fit allocation strategy")                           \
1526                                                                             \
1527   product(bool, UseCMSCollectionPassing, true,                              \
1528           "Use passing of collection from background to foreground")        \
1529                                                                             \
1530   product(bool, UseParNewGC, false,                                         \
1531           "Use parallel threads in the new generation")                     \
1532                                                                             \
1533   product(bool, ParallelGCVerbose, false,                                   \
1534           "Verbose output for parallel gc")                                 \
1535                                                                             \
1536   product(uintx, ParallelGCBufferWastePct, 10,                              \
1537           "Wasted fraction of parallel allocation buffer")                  \
1538                                                                             \
1539   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1540           "Retain parallel allocation buffers across scavenges; "           \
1541           "it is disabled because this currently conflicts with "           \
1542           "parallel card scanning under certain conditions.")               \
1543                                                                             \
1544   product(uintx, TargetPLABWastePct, 10,                                    \
1545           "Target wasted space in last buffer as percent of overall "       \
1546           "allocation")                                                     \
1547                                                                             \
1548   product(uintx, PLABWeight, 75,                                            \
1549           "Percentage (0-100) used to weigh the current sample when "       \
1550           "computing exponentially decaying average for ResizePLAB")        \
1551                                                                             \
1552   product(bool, ResizePLAB, true,                                           \
1553           "Dynamically resize (survivor space) promotion LAB's")            \
1554                                                                             \
1555   product(bool, PrintPLAB, false,                                           \
1556           "Print (survivor space) promotion LAB's sizing decisions")        \
1557                                                                             \
1558   product(intx, ParGCArrayScanChunk, 50,                                    \
1559           "Scan a subset of object array and push remainder, if array is "  \
1560           "bigger than this")                                               \
1561                                                                             \
1562   product(bool, ParGCUseLocalOverflow, false,                               \
1563           "Instead of a global overflow list, use local overflow stacks")   \
1564                                                                             \
1565   product(bool, ParGCTrimOverflow, true,                                    \
1566           "Eagerly trim the local overflow lists "                          \
1567           "(when ParGCUseLocalOverflow)")                                   \
1568                                                                             \
1569   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1570           "Simulate work queue overflow in ParNew")                         \
1571                                                                             \
1572   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1573           "An `interval' counter that determines how frequently "           \
1574           "we simulate overflow; a smaller number increases frequency")     \
1575                                                                             \
1576   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1577           "The desired number of objects to claim from the overflow list")  \
1578                                                                             \
1579   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1580           "The number of strides per worker thread that we divide up the "  \
1581           "card table scanning work into")                                  \
1582                                                                             \
1583   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1584           "The number of cards in each chunk of the parallel chunks used "  \
1585           "during card table scanning")                                     \
1586                                                                             \
1587   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1588           "Number of blocks to attempt to claim when refilling CMS LAB's "  \
1589           "for parallel GC")                                                \
1590                                                                             \
1591   product(uintx, OldPLABWeight, 50,                                         \
1592           "Percentage (0-100) used to weight the current sample when "      \
1593           "computing exponentially decaying average for resizing "          \
1594           "CMSParPromoteBlocksToClaim")                                     \
1595                                                                             \
1596   product(bool, ResizeOldPLAB, true,                                        \
1597           "Dynamically resize (old gen) promotion LAB's")                   \
1598                                                                             \
1599   product(bool, PrintOldPLAB, false,                                        \
1600           "Print (old gen) promotion LAB's sizing decisions")               \
1601                                                                             \
1602   product(uintx, CMSOldPLABMin, 16,                                         \
1603           "Minimum size of CMS gen promotion LAB caches per worker "        \
1604           "per block size")                                                 \
1605                                                                             \
1606   product(uintx, CMSOldPLABMax, 1024,                                       \
1607           "Maximum size of CMS gen promotion LAB caches per worker "        \
1608           "per block size")                                                 \
1609                                                                             \
1610   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1611           "Nominal number of refills of CMS gen promotion LAB cache "       \
1612           "per worker per block size")                                      \
1613                                                                             \
1614   product(bool, CMSOldPLABResizeQuicker, false,                             \
1615           "React on-the-fly during a scavenge to a sudden "                 \
1616           "change in block demand rate")                                    \
1617                                                                             \
1618   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1619           "The tolerance of the phase-change detector for on-the-fly "      \
1620           "PLAB resizing during a scavenge")                                \
1621                                                                             \
1622   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1623           "The gain in the feedback loop for on-the-fly PLAB resizing "     \
1624           "during a scavenge")                                              \
1625                                                                             \
1626   product(bool, AlwaysPreTouch, false,                                      \
1627           "Force all freshly committed pages to be pre-touched")            \
1628                                                                             \
1629   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1630           "The maximum size of young gen chosen by default per GC worker "  \
1631           "thread available")                                               \
1632                                                                             \
1633   product(bool, CMSIncrementalMode, false,                                  \
1634           "Whether CMS GC should operate in \"incremental\" mode")          \
1635                                                                             \
1636   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1637           "Percentage (0-100) of CMS incremental mode duty cycle. If "      \
1638           "CMSIncrementalPacing is enabled, then this is just the initial " \
1639           "value.")                                                         \
1640                                                                             \
1641   product(bool, CMSIncrementalPacing, true,                                 \
1642           "Whether the CMS incremental mode duty cycle should be "          \
1643           "automatically adjusted")                                         \
1644                                                                             \
1645   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1646           "Minimum percentage (0-100) of the CMS incremental duty cycle "   \
1647           "used when CMSIncrementalPacing is enabled")                      \
1648                                                                             \
1649   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1650           "Percentage (0-100) used to add conservatism when computing the " \
1651           "duty cycle")                                                     \
1652                                                                             \
1653   product(uintx, CMSIncrementalOffset, 0,                                   \
1654           "Percentage (0-100) by which the CMS incremental mode duty cycle "\
1655           "is shifted to the right within the period between young GCs")    \
1656                                                                             \
1657   product(uintx, CMSExpAvgFactor, 50,                                       \
1658           "Percentage (0-100) used to weigh the current sample when "       \
1659           "computing exponential averages for CMS statistics")              \
1660                                                                             \
1661   product(uintx, CMS_FLSWeight, 75,                                         \
1662           "Percentage (0-100) used to weigh the current sample when "       \
1663           "computing exponentially decaying averages for CMS FLS "          \
1664           "statistics")                                                     \
1665                                                                             \
1666   product(uintx, CMS_FLSPadding, 1,                                         \
1667           "The multiple of deviation from mean to use for buffering "       \
1668           "against volatility in free list demand")                         \
1669                                                                             \
1670   product(uintx, FLSCoalescePolicy, 2,                                      \
1671           "CMS: aggressiveness level for coalescing, increasing "           \
1672           "from 0 to 4")                                                    \
1673                                                                             \
1674   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1675           "CMS: larger free blocks are always available for coalescing")    \
1676                                                                             \
1677   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1678           "CMS: the smaller the percentage the greater the coalescing "     \
1679           "force")                                                          \
1680                                                                             \
1681   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1682           "CMS: the factor by which to inflate estimated demand of small "  \
1683           "block sizes to prevent coalescing with an adjoining block")      \
1684                                                                             \
1685   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1686           "CMS: the factor by which to inflate estimated demand of large "  \
1687           "block sizes to prevent coalescing with an adjoining block")      \
1688                                                                             \
1689   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1690           "CMS: the factor by which to inflate estimated demand of small "  \
1691           "block sizes to prevent splitting to supply demand for smaller "  \
1692           "blocks")                                                         \
1693                                                                             \
1694   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1695           "CMS: the factor by which to inflate estimated demand of large "  \
1696           "block sizes to prevent splitting to supply demand for smaller "  \
1697           "blocks")                                                         \
1698                                                                             \
1699   product(bool, CMSExtrapolateSweep, false,                                 \
1700           "CMS: cushion for block demand during sweep")                     \
1701                                                                             \
1702   product(uintx, CMS_SweepWeight, 75,                                       \
1703           "Percentage (0-100) used to weight the current sample when "      \
1704           "computing exponentially decaying average for inter-sweep "       \
1705           "duration")                                                       \
1706                                                                             \
1707   product(uintx, CMS_SweepPadding, 1,                                       \
1708           "The multiple of deviation from mean to use for buffering "       \
1709           "against volatility in inter-sweep duration")                     \
1710                                                                             \
1711   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1712           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1713           "duration exceeds this threshold in milliseconds")                \
1714                                                                             \
1715   develop(bool, CMSTraceIncrementalMode, false,                             \
1716           "Trace CMS incremental mode")                                     \
1717                                                                             \
1718   develop(bool, CMSTraceIncrementalPacing, false,                           \
1719           "Trace CMS incremental mode pacing computation")                  \
1720                                                                             \
1721   develop(bool, CMSTraceThreadState, false,                                 \
1722           "Trace the CMS thread state (enable the trace_state() method)")   \
1723                                                                             \
1724   product(bool, CMSClassUnloadingEnabled, true,                             \
1725           "Whether class unloading enabled when using CMS GC")              \
1726                                                                             \
1727   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1728           "When CMS class unloading is enabled, the maximum CMS cycle "     \
1729           "count for which classes may not be unloaded")                    \
1730                                                                             \
1731   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1732           "Compact when asked to collect CMS gen with "                     \
1733           "clear_all_soft_refs()")                                          \
1734                                                                             \
1735   product(bool, UseCMSCompactAtFullCollection, true,                        \
1736           "Use Mark-Sweep-Compact algorithm at full collections")           \
1737                                                                             \
1738   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1739           "Number of CMS full collection done before compaction if > 0")    \
1740                                                                             \
1741   develop(intx, CMSDictionaryChoice, 0,                                     \
1742           "Use BinaryTreeDictionary as default in the CMS generation")      \
1743                                                                             \
1744   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1745           "Replenish an indexed free list with this number of chunks")      \
1746                                                                             \
1747   product(bool, CMSReplenishIntermediate, true,                             \
1748           "Replenish all intermediate free-list caches")                    \
1749                                                                             \
1750   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1751           "When satisfying batched demand, split blocks from the "          \
1752           "IndexedFreeList whose size is a multiple of requested size")     \
1753                                                                             \
1754   product(bool, CMSLoopWarn, false,                                         \
1755           "Warn in case of excessive CMS looping")                          \
1756                                                                             \
1757   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1758           "Restore preserved marks early")                                  \
1759                                                                             \
1760   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1761           "Size of marking stack")                                          \
1762                                                                             \
1763   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1764           "Maximum size of marking stack")                                  \
1765                                                                             \
1766   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1767           "Simulate frequent marking stack / work queue overflow")          \
1768                                                                             \
1769   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1770           "An \"interval\" counter that determines how frequently "         \
1771           "to simulate overflow; a smaller number increases frequency")     \
1772                                                                             \
1773   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1774           "(Temporary, subject to experimentation) "                        \
1775           "Maximum number of abortable preclean iterations, if > 0")        \
1776                                                                             \
1777   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1778           "(Temporary, subject to experimentation) "                        \
1779           "Maximum time in abortable preclean (in milliseconds)")           \
1780                                                                             \
1781   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1782           "(Temporary, subject to experimentation) "                        \
1783           "Nominal minimum work per abortable preclean iteration")          \
1784                                                                             \
1785   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1786           "(Temporary, subject to experimentation) "                        \
1787           "Time that we sleep between iterations when not given "           \
1788           "enough work per iteration")                                      \
1789                                                                             \
1790   product(uintx, CMSRescanMultiple, 32,                                     \
1791           "Size (in cards) of CMS parallel rescan task")                    \
1792                                                                             \
1793   product(uintx, CMSConcMarkMultiple, 32,                                   \
1794           "Size (in cards) of CMS concurrent MT marking task")              \
1795                                                                             \
1796   product(bool, CMSAbortSemantics, false,                                   \
1797           "Whether abort-on-overflow semantics is implemented")             \
1798                                                                             \
1799   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1800           "Use the parallel initial mark.")                                 \
1801                                                                             \
1802   product(bool, CMSParallelRemarkEnabled, true,                             \
1803           "Whether parallel remark enabled (only if ParNewGC)")             \
1804                                                                             \
1805   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1806           "Whether parallel remark of survivor space "                      \
1807           "enabled (effective only if CMSParallelRemarkEnabled)")           \
1808                                                                             \
1809   product(bool, CMSPLABRecordAlways, true,                                  \
1810           "Always record survivor space PLAB boundaries (effective only "   \
1811           "if CMSParallelSurvivorRemarkEnabled)")                           \
1812                                                                             \
1813   product(bool, CMSEdenChunksRecordAlways, true,                            \
1814           "Always record eden chunks used for the parallel initial mark "   \
1815           "or remark of eden")                                              \
1816                                                                             \
1817   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1818           "Print the eden and the survivor chunks used for the parallel "   \
1819           "initial mark or remark of the eden/survivor spaces")             \
1820                                                                             \
1821   product(bool, CMSConcurrentMTEnabled, true,                               \
1822           "Whether multi-threaded concurrent work enabled "                 \
1823           "(effective only if ParNewGC)")                                   \
1824                                                                             \
1825   product(bool, CMSPrecleaningEnabled, true,                                \
1826           "Whether concurrent precleaning enabled")                         \
1827                                                                             \
1828   product(uintx, CMSPrecleanIter, 3,                                        \
1829           "Maximum number of precleaning iteration passes")                 \
1830                                                                             \
1831   product(uintx, CMSPrecleanNumerator, 2,                                   \
1832           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1833           "ratio")                                                          \
1834                                                                             \
1835   product(uintx, CMSPrecleanDenominator, 3,                                 \
1836           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \
1837           "ratio")                                                          \
1838                                                                             \
1839   product(bool, CMSPrecleanRefLists1, true,                                 \
1840           "Preclean ref lists during (initial) preclean phase")             \
1841                                                                             \
1842   product(bool, CMSPrecleanRefLists2, false,                                \
1843           "Preclean ref lists during abortable preclean phase")             \
1844                                                                             \
1845   product(bool, CMSPrecleanSurvivors1, false,                               \
1846           "Preclean survivors during (initial) preclean phase")             \
1847                                                                             \
1848   product(bool, CMSPrecleanSurvivors2, true,                                \
1849           "Preclean survivors during abortable preclean phase")             \
1850                                                                             \
1851   product(uintx, CMSPrecleanThreshold, 1000,                                \
1852           "Do not iterate again if number of dirty cards is less than this")\
1853                                                                             \
1854   product(bool, CMSCleanOnEnter, true,                                      \
1855           "Clean-on-enter optimization for reducing number of dirty cards") \
1856                                                                             \
1857   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1858           "Choose variant (1,2) of verification following remark")          \
1859                                                                             \
1860   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1861           "If Eden size is below this, do not try to schedule remark")      \
1862                                                                             \
1863   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1864           "The Eden occupancy percentage (0-100) at which "                 \
1865           "to try and schedule remark pause")                               \
1866                                                                             \
1867   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1868           "Start sampling eden top at least before young gen "              \
1869           "occupancy reaches 1/<ratio> of the size at which "               \
1870           "we plan to schedule remark")                                     \
1871                                                                             \
1872   product(uintx, CMSSamplingGrain, 16*K,                                    \
1873           "The minimum distance between eden samples for CMS (see above)")  \
1874                                                                             \
1875   product(bool, CMSScavengeBeforeRemark, false,                             \
1876           "Attempt scavenge before the CMS remark step")                    \
1877                                                                             \
1878   develop(bool, CMSTraceSweeper, false,                                     \
1879           "Trace some actions of the CMS sweeper")                          \
1880                                                                             \
1881   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1882           "Don't drain below this size per parallel worker/thief")          \
1883                                                                             \
1884   manageable(intx, CMSWaitDuration, 2000,                                   \
1885           "Time in milliseconds that CMS thread waits for young GC")        \
1886                                                                             \
1887   develop(uintx, CMSCheckInterval, 1000,                                    \
1888           "Interval in milliseconds that CMS thread checks if it "          \
1889           "should start a collection cycle")                                \
1890                                                                             \
1891   product(bool, CMSYield, true,                                             \
1892           "Yield between steps of CMS")                                     \
1893                                                                             \
1894   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1895           "Bitmap operations should process at most this many bits "        \
1896           "between yields")                                                 \
1897                                                                             \
1898   product(bool, CMSDumpAtPromotionFailure, false,                           \
1899           "Dump useful information about the state of the CMS old "         \
1900           "generation upon a promotion failure")                            \
1901                                                                             \
1902   product(bool, CMSPrintChunksInDump, false,                                \
1903           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1904           "more detailed information about the free chunks")                \
1905                                                                             \
1906   product(bool, CMSPrintObjectsInDump, false,                               \
1907           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1908           "more detailed information about the allocated objects")          \
1909                                                                             \
1910   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1911           "Verify that all references across the FLS boundary "             \
1912           "are to valid objects")                                           \
1913                                                                             \
1914   diagnostic(bool, FLSVerifyLists, false,                                   \
1915           "Do lots of (expensive) FreeListSpace verification")              \
1916                                                                             \
1917   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1918           "Do lots of (expensive) FLS index table verification")            \
1919                                                                             \
1920   develop(bool, FLSVerifyDictionary, false,                                 \
1921           "Do lots of (expensive) FLS dictionary verification")             \
1922                                                                             \
1923   develop(bool, VerifyBlockOffsetArray, false,                              \
1924           "Do (expensive) block offset array verification")                 \
1925                                                                             \
1926   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1927           "Maintain _unallocated_block in BlockOffsetArray "                \
1928           "(currently applicable only to CMS collector)")                   \
1929                                                                             \
1930   develop(bool, TraceCMSState, false,                                       \
1931           "Trace the state of the CMS collection")                          \
1932                                                                             \
1933   product(intx, RefDiscoveryPolicy, 0,                                      \
1934           "Select type of reference discovery policy: "                     \
1935           "reference-based(0) or referent-based(1)")                        \
1936                                                                             \
1937   product(bool, ParallelRefProcEnabled, false,                              \
1938           "Enable parallel reference processing whenever possible")         \
1939                                                                             \
1940   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1941           "Enable balancing of reference processing queues")                \
1942                                                                             \
1943   product(uintx, CMSTriggerRatio, 80,                                       \
1944           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1945           "allocated before a CMS collection cycle commences")              \
1946                                                                             \
1947   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1948           "Percentage CMS generation occupancy at which to "                \
1949           "initiate CMS collection for bootstrapping collection stats")     \
1950                                                                             \
1951   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1952           "Percentage CMS generation occupancy to start a CMS collection "  \
1953           "cycle. A negative value means that CMSTriggerRatio is used")     \
1954                                                                             \
1955   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1956           "Percentage of the (entire) heap occupancy to start a "           \
1957           "concurrent GC cycle. It is used by GCs that trigger a "          \
1958           "concurrent GC cycle based on the occupancy of the entire heap, " \
1959           "not just one of the generations (e.g., G1). A value of 0 "       \
1960           "denotes 'do constant GC cycles'.")                               \
1961                                                                             \
1962   manageable(intx, CMSTriggerInterval, -1,                                  \
1963           "Commence a CMS collection cycle (at least) every so many "       \
1964           "milliseconds (0 permanently, -1 disabled)")                      \
1965                                                                             \
1966   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1967           "Only use occupancy as a criterion for starting a CMS collection")\
1968                                                                             \
1969   product(uintx, CMSIsTooFullPercentage, 98,                                \
1970           "An absolute ceiling above which CMS will always consider the "   \
1971           "unloading of classes when class unloading is enabled")           \
1972                                                                             \
1973   develop(bool, CMSTestInFreeList, false,                                   \
1974           "Check if the coalesced range is already in the "                 \
1975           "free lists as claimed")                                          \
1976                                                                             \
1977   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1978           "Check that all the garbage collected was returned to the "       \
1979           "free lists")                                                     \
1980                                                                             \
1981   notproduct(bool, ScavengeALot, false,                                     \
1982           "Force scavenge at every Nth exit from the runtime system "       \
1983           "(N=ScavengeALotInterval)")                                       \
1984                                                                             \
1985   develop(bool, FullGCALot, false,                                          \
1986           "Force full gc at every Nth exit from the runtime system "        \
1987           "(N=FullGCALotInterval)")                                         \
1988                                                                             \
1989   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1990           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1991                                                                             \
1992   product(bool, PrintPromotionFailure, false,                               \
1993           "Print additional diagnostic information following "              \
1994           "promotion failure")                                              \
1995                                                                             \
1996   notproduct(bool, PromotionFailureALot, false,                             \
1997           "Use promotion failure handling on every youngest generation "    \
1998           "collection")                                                     \
1999                                                                             \
2000   develop(uintx, PromotionFailureALotCount, 1000,                           \
2001           "Number of promotion failures occurring at ParGCAllocBuffer "     \
2002           "refill attempts (ParNew) or promotion attempts "                 \
2003           "(other young collectors)")                                       \
2004                                                                             \
2005   develop(uintx, PromotionFailureALotInterval, 5,                           \
2006           "Total collections between promotion failures alot")              \
2007                                                                             \
2008   experimental(uintx, WorkStealingSleepMillis, 1,                           \
2009           "Sleep time when sleep is used for yields")                       \
2010                                                                             \
2011   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
2012           "Number of yields before a sleep is done during workstealing")    \
2013                                                                             \
2014   experimental(uintx, WorkStealingHardSpins, 4096,                          \
2015           "Number of iterations in a spin loop between checks on "          \
2016           "time out of hard spin")                                          \
2017                                                                             \
2018   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
2019           "Ratio of hard spins to calls to yield")                          \
2020                                                                             \
2021   develop(uintx, ObjArrayMarkingStride, 512,                                \
2022           "Number of object array elements to push onto the marking stack " \
2023           "before pushing a continuation entry")                            \
2024                                                                             \
2025   develop(bool, MetadataAllocationFailALot, false,                          \
2026           "Fail metadata allocations at intervals controlled by "           \
2027           "MetadataAllocationFailALotInterval")                             \
2028                                                                             \
2029   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
2030           "Metadata allocation failure a lot interval")                     \
2031                                                                             \
2032   develop(bool, TraceMetadataChunkAllocation, false,                        \
2033           "Trace chunk metadata allocations")                               \
2034                                                                             \
2035   product(bool, TraceMetadataHumongousAllocation, false,                    \
2036           "Trace humongous metadata allocations")                           \
2037                                                                             \
2038   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
2039           "Trace virtual space metadata allocations")                       \
2040                                                                             \
2041   notproduct(bool, ExecuteInternalVMTests, false,                           \
2042           "Enable execution of internal VM tests")                          \
2043                                                                             \
2044   notproduct(bool, VerboseInternalVMTests, false,                           \
2045           "Turn on logging for internal VM tests.")                         \
2046                                                                             \
2047   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
2048                                                                             \
2049   product_pd(bool, ResizeTLAB,                                              \
2050           "Dynamically resize TLAB size for threads")                       \
2051                                                                             \
2052   product(bool, ZeroTLAB, false,                                            \
2053           "Zero out the newly created TLAB")                                \
2054                                                                             \
2055   product(bool, FastTLABRefill, true,                                       \
2056           "Use fast TLAB refill code")                                      \
2057                                                                             \
2058   product(bool, PrintTLAB, false,                                           \
2059           "Print various TLAB related information")                         \
2060                                                                             \
2061   product(bool, TLABStats, true,                                            \
2062           "Provide more detailed and expensive TLAB statistics "            \
2063           "(with PrintTLAB)")                                               \
2064                                                                             \
2065   product_pd(bool, NeverActAsServerClassMachine,                            \
2066           "Never act like a server-class machine")                          \
2067                                                                             \
2068   product(bool, AlwaysActAsServerClassMachine, false,                       \
2069           "Always act like a server-class machine")                         \
2070                                                                             \
2071   product_pd(uint64_t, MaxRAM,                                              \
2072           "Real memory size (in bytes) used to set maximum heap size")      \
2073                                                                             \
2074   product(bool, AggressiveHeap, false,                                      \
2075           "Optimize heap options for long-running memory intensive apps")   \
2076                                                                             \
2077   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2078           "Maximum ergonomically set heap size (in bytes); zero means use " \
2079           "MaxRAM * MaxRAMPercentage / 100")                                \
2080                                                                             \
2081   experimental(bool, UseCGroupMemoryLimitForHeap, false,                    \
2082           "Use CGroup memory limit as physical memory limit for heap "      \
2083           "sizing"                                                          \
2084           "Deprecated, replaced by container support")                      \
2085                                                                             \
2086   diagnostic(bool, PrintContainerInfo, false,                               \
2087           "Print container related information")                            \
2088                                                                             \
2089   diagnostic(bool, PrintActiveCpus, false,                                  \
2090            "Print the number of CPUs detected in os::active_processor_count") \
2091                                                                             \
2092   product(uintx, MaxRAMFraction, 4,                                         \
2093           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2094           "size")                                                           \
2095                                                                             \
2096   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2097           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2098           "size; deprecated: to be renamed to MaxRAMFraction")              \
2099                                                                             \
2100   product(uintx, MinRAMFraction, 2,                                         \
2101           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2102           "size on systems with small physical memory size")                \
2103                                                                             \
2104   product(uintx, InitialRAMFraction, 64,                                    \
2105           "Fraction (1/n) of real memory used for initial heap size")       \
2106                                                                             \
2107   product(double, MaxRAMPercentage, 25.0,                                   \
2108           "Maximum percentage of real memory used for maximum heap size")   \
2109                                                                             \
2110   product(double, MinRAMPercentage, 50.0,                                   \
2111           "Minimum percentage of real memory used for maximum heap"         \
2112           "size on systems with small physical memory size")                \
2113                                                                             \
2114   product(double, InitialRAMPercentage, 1.5625,                             \
2115           "Percentage of real memory used for initial heap size")           \
2116                                                                             \
2117   product(intx, ActiveProcessorCount, -1,                                   \
2118           "Specify the CPU count the VM should use and report as active")   \
2119                                                                             \
2120   develop(uintx, MaxVirtMemFraction, 2,                                     \
2121           "Maximum fraction (1/n) of virtual memory used for ergonomically "\
2122           "determining maximum heap size")                                  \
2123                                                                             \
2124   product(bool, UseAutoGCSelectPolicy, false,                               \
2125           "Use automatic collection selection policy")                      \
2126                                                                             \
2127   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2128           "Automatic GC selection pause threshold in milliseconds")         \
2129                                                                             \
2130   product(bool, UseAdaptiveSizePolicy, true,                                \
2131           "Use adaptive generation sizing policies")                        \
2132                                                                             \
2133   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2134           "Use adaptive survivor sizing policies")                          \
2135                                                                             \
2136   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2137           "Use adaptive young-old sizing policies at minor collections")    \
2138                                                                             \
2139   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2140           "Use adaptive young-old sizing policies at major collections")    \
2141                                                                             \
2142   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2143           "Include statistics from System.gc() for adaptive size policy")   \
2144                                                                             \
2145   product(bool, UseAdaptiveGCBoundary, false,                               \
2146           "Allow young-old boundary to move")                               \
2147                                                                             \
2148   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2149           "Trace young-old boundary moves")                                 \
2150                                                                             \
2151   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2152           "Resize the virtual spaces of the young or old generations")      \
2153                                                                             \
2154   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2155           "Policy for changing generation size for throughput goals")       \
2156                                                                             \
2157   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2158           "Policy for changing generation size for pause goals")            \
2159                                                                             \
2160   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2161           "Adjust tenured generation to achieve a minor pause goal")        \
2162                                                                             \
2163   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2164           "Adjust young generation to achieve a major pause goal")          \
2165                                                                             \
2166   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2167           "Number of steps where heuristics is used before data is used")   \
2168                                                                             \
2169   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2170           "Number of collections before the adaptive sizing is started")    \
2171                                                                             \
2172   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2173           "Collection interval for printing information; zero means never") \
2174                                                                             \
2175   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2176           "Use adaptive minimum footprint as a goal")                       \
2177                                                                             \
2178   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2179           "Weight given to exponential resizing, between 0 and 100")        \
2180                                                                             \
2181   product(uintx, AdaptiveTimeWeight,       25,                              \
2182           "Weight given to time in adaptive policy, between 0 and 100")     \
2183                                                                             \
2184   product(uintx, PausePadding, 1,                                           \
2185           "How much buffer to keep for pause time")                         \
2186                                                                             \
2187   product(uintx, PromotedPadding, 3,                                        \
2188           "How much buffer to keep for promotion failure")                  \
2189                                                                             \
2190   product(uintx, SurvivorPadding, 3,                                        \
2191           "How much buffer to keep for survivor overflow")                  \
2192                                                                             \
2193   product(uintx, ThresholdTolerance, 10,                                    \
2194           "Allowed collection cost difference between generations")         \
2195                                                                             \
2196   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2197           "If collection costs are within margin, reduce both by full "     \
2198           "delta")                                                          \
2199                                                                             \
2200   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2201           "Adaptive size percentage change in young generation")            \
2202                                                                             \
2203   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2204           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2205                                                                             \
2206   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2207           "Decay factor to YoungedGenerationSizeSupplement")                \
2208                                                                             \
2209   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2210           "Adaptive size percentage change in tenured generation")          \
2211                                                                             \
2212   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2213           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2214                                                                             \
2215   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2216           "Decay factor to TenuredGenerationSizeIncrement")                 \
2217                                                                             \
2218   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2219           "Adaptive size policy maximum GC pause time goal in millisecond, "\
2220           "or (G1 Only) the maximum GC time per MMU time slice")            \
2221                                                                             \
2222   product(uintx, GCPauseIntervalMillis, 0,                                  \
2223           "Time slice for MMU specification")                               \
2224                                                                             \
2225   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2226           "Adaptive size policy maximum GC minor pause time goal "          \
2227           "in millisecond")                                                 \
2228                                                                             \
2229   product(uintx, GCTimeRatio, 99,                                           \
2230           "Adaptive size policy application time to GC time ratio")         \
2231                                                                             \
2232   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2233           "Adaptive size scale down factor for shrinking")                  \
2234                                                                             \
2235   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2236           "Adaptive size decays the major cost for long major intervals")   \
2237                                                                             \
2238   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2239           "Time scale over which major costs decay")                        \
2240                                                                             \
2241   product(uintx, MinSurvivorRatio, 3,                                       \
2242           "Minimum ratio of young generation/survivor space size")          \
2243                                                                             \
2244   product(uintx, InitialSurvivorRatio, 8,                                   \
2245           "Initial ratio of young generation/survivor space size")          \
2246                                                                             \
2247   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2248           "Estimate of footprint other than Java Heap")                     \
2249                                                                             \
2250   product(bool, UseGCOverheadLimit, true,                                   \
2251           "Use policy to limit of proportion of time spent in GC "          \
2252           "before an OutOfMemory error is thrown")                          \
2253                                                                             \
2254   product(uintx, GCTimeLimit, 98,                                           \
2255           "Limit of the proportion of time spent in GC before "             \
2256           "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)")      \
2257                                                                             \
2258   product(uintx, GCHeapFreeLimit, 2,                                        \
2259           "Minimum percentage of free space after a full GC before an "     \
2260           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2261                                                                             \
2262   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2263           "Number of consecutive collections before gc time limit fires")   \
2264                                                                             \
2265   product(bool, PrintAdaptiveSizePolicy, false,                             \
2266           "Print information about AdaptiveSizePolicy")                     \
2267                                                                             \
2268   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2269           "How far ahead to prefetch destination area (<= 0 means off)")    \
2270                                                                             \
2271   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2272           "How far ahead to prefetch scan area (<= 0 means off)")           \
2273                                                                             \
2274   product(intx, PrefetchFieldsAhead, -1,                                    \
2275           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2276                                                                             \
2277   diagnostic(bool, VerifySilently, false,                                   \
2278           "Do not print the verification progress")                         \
2279                                                                             \
2280   diagnostic(bool, VerifyDuringStartup, false,                              \
2281           "Verify memory system before executing any Java code "            \
2282           "during VM initialization")                                       \
2283                                                                             \
2284   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2285           "Verify system before exiting")                                   \
2286                                                                             \
2287   diagnostic(bool, VerifyBeforeGC, false,                                   \
2288           "Verify memory system before GC")                                 \
2289                                                                             \
2290   diagnostic(bool, VerifyAfterGC, false,                                    \
2291           "Verify memory system after GC")                                  \
2292                                                                             \
2293   diagnostic(bool, VerifyDuringGC, false,                                   \
2294           "Verify memory system during GC (between phases)")                \
2295                                                                             \
2296   diagnostic(ccstrlist, VerifySubSet, "",                                   \
2297           "Memory sub-systems to verify when Verify*GC flag(s) "            \
2298           "are enabled. One or more sub-systems can be specified "          \
2299           "in a comma separated string. Sub-systems are: "                  \
2300           "threads, heap, symbol_table, string_table, codecache, "          \
2301           "dictionary, classloader_data_graph, metaspace, jni_handles, "    \
2302           "c-heap, codecache_oops")                                         \
2303                                                                             \
2304   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2305           "Enable parallel memory system verification")                     \
2306                                                                             \
2307   diagnostic(bool, DeferInitialCardMark, false,                             \
2308           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2309           "may arise from new_pre_store_barrier")                           \
2310                                                                             \
2311   diagnostic(bool, VerifyRememberedSets, false,                             \
2312           "Verify GC remembered sets")                                      \
2313                                                                             \
2314   diagnostic(bool, VerifyObjectStartArray, true,                            \
2315           "Verify GC object start array if verify before/after")            \
2316                                                                             \
2317   product(bool, DisableExplicitGC, false,                                   \
2318           "Ignore calls to System.gc()")                                    \
2319                                                                             \
2320   notproduct(bool, CheckMemoryInitialization, false,                        \
2321           "Check memory initialization")                                    \
2322                                                                             \
2323   product(bool, CollectGen0First, false,                                    \
2324           "Collect youngest generation before each full GC")                \
2325                                                                             \
2326   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2327           "Bind CMS Thread to CPU if possible")                             \
2328                                                                             \
2329   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2330           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2331                                                                             \
2332   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2333           "Bind GCTaskThreads to CPUs if possible")                         \
2334                                                                             \
2335   product(bool, UseGCTaskAffinity, false,                                   \
2336           "Use worker affinity when asking for GCTasks")                    \
2337                                                                             \
2338   product(uintx, ProcessDistributionStride, 4,                              \
2339           "Stride through processors when distributing processes")          \
2340                                                                             \
2341   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2342           "Number of times the coordinator GC thread will sleep while "     \
2343           "yielding before giving up and resuming GC")                      \
2344                                                                             \
2345   product(uintx, CMSYieldSleepCount, 0,                                     \
2346           "Number of times a GC thread (minus the coordinator) "            \
2347           "will sleep while yielding before giving up and resuming GC")     \
2348                                                                             \
2349   /* gc tracing */                                                          \
2350   manageable(bool, PrintGC, false,                                          \
2351           "Print message at garbage collection")                            \
2352                                                                             \
2353   manageable(bool, PrintGCDetails, false,                                   \
2354           "Print more details at garbage collection")                       \
2355                                                                             \
2356   manageable(bool, PrintGCDateStamps, false,                                \
2357           "Print date stamps at garbage collection")                        \
2358                                                                             \
2359   manageable(bool, PrintGCTimeStamps, false,                                \
2360           "Print timestamps at garbage collection")                         \
2361                                                                             \
2362   manageable(bool, PrintGCID, false,                                        \
2363           "Print an identifier for each garbage collection")                \
2364                                                                             \
2365   product(bool, PrintGCTaskTimeStamps, false,                               \
2366           "Print timestamps for individual gc worker thread tasks")         \
2367                                                                             \
2368   develop(intx, ConcGCYieldTimeout, 0,                                      \
2369           "If non-zero, assert that GC threads yield within this "          \
2370           "number of milliseconds")                                         \
2371                                                                             \
2372   notproduct(bool, TraceMarkSweep, false,                                   \
2373           "Trace mark sweep")                                               \
2374                                                                             \
2375   product(bool, PrintReferenceGC, false,                                    \
2376           "Print times spent handling reference objects during GC "         \
2377           "(enabled only when PrintGCDetails)")                             \
2378                                                                             \
2379   develop(bool, TraceReferenceGC, false,                                    \
2380           "Trace handling of soft/weak/final/phantom references")           \
2381                                                                             \
2382   develop(bool, TraceFinalizerRegistration, false,                          \
2383           "Trace registration of final references")                         \
2384                                                                             \
2385   notproduct(bool, TraceScavenge, false,                                    \
2386           "Trace scavenge")                                                 \
2387                                                                             \
2388   product(bool, IgnoreEmptyClassPaths, false,                               \
2389           "Ignore empty path elements in -classpath")                       \
2390                                                                             \
2391   product(bool, TraceClassPaths, false,                                     \
2392           "Trace processing of class paths")                                \
2393                                                                             \
2394   product_rw(bool, TraceClassLoading, false,                                \
2395           "Trace all classes loaded")                                       \
2396                                                                             \
2397   product(bool, TraceClassLoadingPreorder, false,                           \
2398           "Trace all classes loaded in order referenced (not loaded)")      \
2399                                                                             \
2400   product_rw(bool, TraceClassUnloading, false,                              \
2401           "Trace unloading of classes")                                     \
2402                                                                             \
2403   product_rw(bool, TraceLoaderConstraints, false,                           \
2404           "Trace loader constraints")                                       \
2405                                                                             \
2406   develop(bool, TraceClassLoaderData, false,                                \
2407           "Trace class loader loader_data lifetime")                        \
2408                                                                             \
2409   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2410           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2411           "Initial size of the boot class loader data metaspace")           \
2412                                                                             \
2413   product(bool, TraceGen0Time, false,                                       \
2414           "Trace accumulated time for Gen 0 collection")                    \
2415                                                                             \
2416   product(bool, TraceGen1Time, false,                                       \
2417           "Trace accumulated time for Gen 1 collection")                    \
2418                                                                             \
2419   product(bool, PrintTenuringDistribution, false,                           \
2420           "Print tenuring age information")                                 \
2421                                                                             \
2422   product_rw(bool, PrintHeapAtGC, false,                                    \
2423           "Print heap layout before and after each GC")                     \
2424                                                                             \
2425   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2426           "Print extended information about the layout of the heap "        \
2427           "when -XX:+PrintHeapAtGC is set")                                 \
2428                                                                             \
2429   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2430           "Print heap layout in response to SIGBREAK")                      \
2431                                                                             \
2432   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2433           "Print a class histogram before any major stop-world GC")         \
2434                                                                             \
2435   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2436           "Print a class histogram after any major stop-world GC")          \
2437                                                                             \
2438   manageable(bool, PrintClassHistogram, false,                              \
2439           "Print a histogram of class instances")                           \
2440                                                                             \
2441   develop(bool, TraceWorkGang, false,                                       \
2442           "Trace activities of work gangs")                                 \
2443                                                                             \
2444   product(bool, TraceParallelOldGCTasks, false,                             \
2445           "Trace multithreaded GC activity")                                \
2446                                                                             \
2447   develop(bool, TraceBlockOffsetTable, false,                               \
2448           "Print BlockOffsetTable maps")                                    \
2449                                                                             \
2450   develop(bool, TraceCardTableModRefBS, false,                              \
2451           "Print CardTableModRefBS maps")                                   \
2452                                                                             \
2453   develop(bool, TraceGCTaskManager, false,                                  \
2454           "Trace actions of the GC task manager")                           \
2455                                                                             \
2456   develop(bool, TraceGCTaskQueue, false,                                    \
2457           "Trace actions of the GC task queues")                            \
2458                                                                             \
2459   diagnostic(bool, TraceGCTaskThread, false,                                \
2460           "Trace actions of the GC task threads")                           \
2461                                                                             \
2462   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2463           "Print the time taken by each phase in ParallelOldGC "            \
2464           "(PrintGCDetails must also be enabled)")                          \
2465                                                                             \
2466   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2467           "Trace marking phase in ParallelOldGC")                           \
2468                                                                             \
2469   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2470           "Trace summary phase in ParallelOldGC")                           \
2471                                                                             \
2472   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2473           "Trace compaction phase in ParallelOldGC")                        \
2474                                                                             \
2475   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2476           "Trace dense prefix computation for ParallelOldGC")               \
2477                                                                             \
2478   develop(bool, IgnoreLibthreadGPFault, false,                              \
2479           "Suppress workaround for libthread GP fault")                     \
2480                                                                             \
2481   product(bool, PrintJNIGCStalls, false,                                    \
2482           "Print diagnostic message when GC is stalled "                    \
2483           "by JNI critical section")                                        \
2484                                                                             \
2485   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2486           "The percentage of the used heap that the instances of a class "  \
2487           "must occupy for the class to generate a trace event")            \
2488                                                                             \
2489   /* GC log rotation setting */                                             \
2490                                                                             \
2491   product(bool, UseGCLogFileRotation, false,                                \
2492           "Rotate gclog files (for long running applications). It requires "\
2493           "-Xloggc:<filename>")                                             \
2494                                                                             \
2495   product(uintx, NumberOfGCLogFiles, 0,                                     \
2496           "Number of gclog files in rotation "                              \
2497           "(default: 0, no rotation)")                                      \
2498                                                                             \
2499   product(uintx, GCLogFileSize, 8*K,                                        \
2500           "GC log file size, requires UseGCLogFileRotation. "               \
2501           "Set to 0 to only trigger rotation via jcmd")                     \
2502                                                                             \
2503   /* JVMTI heap profiling */                                                \
2504                                                                             \
2505   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2506           "Trace JVMTI object tagging calls")                               \
2507                                                                             \
2508   diagnostic(bool, VerifyBeforeIteration, false,                            \
2509           "Verify memory system before JVMTI iteration")                    \
2510                                                                             \
2511   /* compiler interface */                                                  \
2512                                                                             \
2513   develop(bool, CIPrintCompilerName, false,                                 \
2514           "when CIPrint is active, print the name of the active compiler")  \
2515                                                                             \
2516   develop(bool, CIPrintCompileQueue, false,                                 \
2517           "display the contents of the compile queue whenever a "           \
2518           "compilation is enqueued")                                        \
2519                                                                             \
2520   develop(bool, CIPrintRequests, false,                                     \
2521           "display every request for compilation")                          \
2522                                                                             \
2523   product(bool, CITime, false,                                              \
2524           "collect timing information for compilation")                     \
2525                                                                             \
2526   develop(bool, CITimeEach, false,                                          \
2527           "display timing information after each successful compilation")   \
2528                                                                             \
2529   develop(bool, CICountOSR, false,                                          \
2530           "use a separate counter when assigning ids to osr compilations")  \
2531                                                                             \
2532   develop(bool, CICompileNatives, true,                                     \
2533           "compile native methods if supported by the compiler")            \
2534                                                                             \
2535   develop_pd(bool, CICompileOSR,                                            \
2536           "compile on stack replacement methods if supported by the "       \
2537           "compiler")                                                       \
2538                                                                             \
2539   develop(bool, CIPrintMethodCodes, false,                                  \
2540           "print method bytecodes of the compiled code")                    \
2541                                                                             \
2542   develop(bool, CIPrintTypeFlow, false,                                     \
2543           "print the results of ciTypeFlow analysis")                       \
2544                                                                             \
2545   develop(bool, CITraceTypeFlow, false,                                     \
2546           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2547                                                                             \
2548   develop(intx, OSROnlyBCI, -1,                                             \
2549           "OSR only at this bci.  Negative values mean exclude that bci")   \
2550                                                                             \
2551   /* compiler */                                                            \
2552                                                                             \
2553   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2554           "Number of compiler threads to run")                              \
2555                                                                             \
2556   product(intx, CompilationPolicyChoice, 0,                                 \
2557           "which compilation policy (0/1)")                                 \
2558                                                                             \
2559   develop(bool, UseStackBanging, true,                                      \
2560           "use stack banging for stack overflow checks (required for "      \
2561           "proper StackOverflow handling; disable only to measure cost "    \
2562           "of stackbanging)")                                               \
2563                                                                             \
2564   develop(bool, UseStrictFP, true,                                          \
2565           "use strict fp if modifier strictfp is set")                      \
2566                                                                             \
2567   develop(bool, GenerateSynchronizationCode, true,                          \
2568           "generate locking/unlocking code for synchronized methods and "   \
2569           "monitors")                                                       \
2570                                                                             \
2571   develop(bool, GenerateCompilerNullChecks, true,                           \
2572           "Generate explicit null checks for loads/stores/calls")           \
2573                                                                             \
2574   develop(bool, GenerateRangeChecks, true,                                  \
2575           "Generate range checks for array accesses")                       \
2576                                                                             \
2577   develop_pd(bool, ImplicitNullChecks,                                      \
2578           "Generate code for implicit null checks")                         \
2579                                                                             \
2580   product_pd(bool, TrapBasedNullChecks,                                     \
2581           "Generate code for null checks that uses a cmp and trap "         \
2582           "instruction raising SIGTRAP.  This is only used if an access to" \
2583           "null (+offset) will not raise a SIGSEGV, i.e.,"                  \
2584           "ImplicitNullChecks don't work (PPC64).")                         \
2585                                                                             \
2586   product(bool, PrintSafepointStatistics, false,                            \
2587           "Print statistics about safepoint synchronization")               \
2588                                                                             \
2589   product(intx, PrintSafepointStatisticsCount, 300,                         \
2590           "Total number of safepoint statistics collected "                 \
2591           "before printing them out")                                       \
2592                                                                             \
2593   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2594           "Print safepoint statistics only when safepoint takes "           \
2595           "more than PrintSafepointSatisticsTimeout in millis")             \
2596                                                                             \
2597   product(bool, TraceSafepointCleanupTime, false,                           \
2598           "Print the break down of clean up tasks performed during "        \
2599           "safepoint")                                                      \
2600                                                                             \
2601   product(bool, Inline, true,                                               \
2602           "Enable inlining")                                                \
2603                                                                             \
2604   product(bool, ClipInlining, true,                                         \
2605           "Clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2606                                                                             \
2607   develop(bool, UseCHA, true,                                               \
2608           "Enable CHA")                                                     \
2609                                                                             \
2610   product(bool, UseTypeProfile, true,                                       \
2611           "Check interpreter profile for historically monomorphic calls")   \
2612                                                                             \
2613   notproduct(bool, TimeCompiler, false,                                     \
2614           "Time the compiler")                                              \
2615                                                                             \
2616   diagnostic(bool, PrintInlining, false,                                    \
2617           "Print inlining optimizations")                                   \
2618                                                                             \
2619   product(bool, UsePopCountInstruction, false,                              \
2620           "Use population count instruction")                               \
2621                                                                             \
2622   develop(bool, EagerInitialization, false,                                 \
2623           "Eagerly initialize classes if possible")                         \
2624                                                                             \
2625   develop(bool, TraceMethodReplacement, false,                              \
2626           "Print when methods are replaced do to recompilation")            \
2627                                                                             \
2628   develop(bool, PrintMethodFlushing, false,                                 \
2629           "Print the nmethods being flushed")                               \
2630                                                                             \
2631   diagnostic(bool, PrintMethodFlushingStatistics, false,                    \
2632           "print statistics about method flushing")                         \
2633                                                                             \
2634   develop(bool, UseRelocIndex, false,                                       \
2635           "Use an index to speed random access to relocations")             \
2636                                                                             \
2637   develop(bool, StressCodeBuffers, false,                                   \
2638           "Exercise code buffer expansion and other rare state changes")    \
2639                                                                             \
2640   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2641           "Generate extra debugging information for non-safepoints in "     \
2642           "nmethods")                                                       \
2643                                                                             \
2644   product(bool, PrintVMOptions, false,                                      \
2645           "Print flags that appeared on the command line")                  \
2646                                                                             \
2647   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2648           "Ignore unrecognized VM options")                                 \
2649                                                                             \
2650   product(bool, PrintCommandLineFlags, false,                               \
2651           "Print flags specified on command line or set by ergonomics")     \
2652                                                                             \
2653   product(bool, PrintFlagsInitial, false,                                   \
2654           "Print all VM flags before argument processing and exit VM")      \
2655                                                                             \
2656   product(bool, PrintFlagsFinal, false,                                     \
2657           "Print all VM flags after argument and ergonomic processing")     \
2658                                                                             \
2659   notproduct(bool, PrintFlagsWithComments, false,                           \
2660           "Print all VM flags with default values and descriptions and "    \
2661           "exit")                                                           \
2662                                                                             \
2663   diagnostic(bool, SerializeVMOutput, true,                                 \
2664           "Use a mutex to serialize output to tty and LogFile")             \
2665                                                                             \
2666   diagnostic(bool, DisplayVMOutput, true,                                   \
2667           "Display all VM output on the tty, independently of LogVMOutput") \
2668                                                                             \
2669   diagnostic(bool, LogVMOutput, false,                                      \
2670           "Save VM output to LogFile")                                      \
2671                                                                             \
2672   diagnostic(ccstr, LogFile, NULL,                                          \
2673           "If LogVMOutput or LogCompilation is on, save VM output to "      \
2674           "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\
2675                                                                             \
2676   product(ccstr, ErrorFile, NULL,                                           \
2677           "If an error occurs, save the error data to this file "           \
2678           "[default: ./hs_err_pid%p.log] (%p replaced with pid)")           \
2679                                                                             \
2680   product(bool, DisplayVMOutputToStderr, false,                             \
2681           "If DisplayVMOutput is true, display all VM output to stderr")    \
2682                                                                             \
2683   product(bool, DisplayVMOutputToStdout, false,                             \
2684           "If DisplayVMOutput is true, display all VM output to stdout")    \
2685                                                                             \
2686   product(bool, UseHeavyMonitors, false,                                    \
2687           "use heavyweight instead of lightweight Java monitors")           \
2688                                                                             \
2689   product(bool, PrintStringTableStatistics, false,                          \
2690           "print statistics about the StringTable and SymbolTable")         \
2691                                                                             \
2692   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2693           "verify StringTable contents at exit")                            \
2694                                                                             \
2695   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2696           "print histogram of the symbol table")                            \
2697                                                                             \
2698   notproduct(bool, ExitVMOnVerifyError, false,                              \
2699           "standard exit from VM if bytecode verify error "                 \
2700           "(only in debug mode)")                                           \
2701                                                                             \
2702   notproduct(ccstr, AbortVMOnException, NULL,                               \
2703           "Call fatal if this exception is thrown.  Example: "              \
2704           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2705                                                                             \
2706   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2707           "Call fatal if the exception pointed by AbortVMOnException "      \
2708           "has this message")                                               \
2709                                                                             \
2710   develop(bool, DebugVtables, false,                                        \
2711           "add debugging code to vtable dispatch")                          \
2712                                                                             \
2713   develop(bool, PrintVtables, false,                                        \
2714           "print vtables when printing klass")                              \
2715                                                                             \
2716   notproduct(bool, PrintVtableStats, false,                                 \
2717           "print vtables stats at end of run")                              \
2718                                                                             \
2719   develop(bool, TraceCreateZombies, false,                                  \
2720           "trace creation of zombie nmethods")                              \
2721                                                                             \
2722   notproduct(bool, IgnoreLockingAssertions, false,                          \
2723           "disable locking assertions (for speed)")                         \
2724                                                                             \
2725   product(bool, RangeCheckElimination, true,                                \
2726           "Eliminate range checks")                                         \
2727                                                                             \
2728   develop_pd(bool, UncommonNullCast,                                        \
2729           "track occurrences of null in casts; adjust compiler tactics")    \
2730                                                                             \
2731   develop(bool, TypeProfileCasts,  true,                                    \
2732           "treat casts like calls for purposes of type profiling")          \
2733                                                                             \
2734   develop(bool, DelayCompilationDuringStartup, true,                        \
2735           "Delay invoking the compiler until main application class is "    \
2736           "loaded")                                                         \
2737                                                                             \
2738   develop(bool, CompileTheWorld, false,                                     \
2739           "Compile all methods in all classes in bootstrap class path "     \
2740           "(stress test)")                                                  \
2741                                                                             \
2742   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2743           "Preload all classes used by a class before start loading")       \
2744                                                                             \
2745   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2746           "Force a safepoint every n compiles so sweeper can keep up")      \
2747                                                                             \
2748   develop(bool, FillDelaySlots, true,                                       \
2749           "Fill delay slots (on SPARC only)")                               \
2750                                                                             \
2751   develop(bool, TimeLivenessAnalysis, false,                                \
2752           "Time computation of bytecode liveness analysis")                 \
2753                                                                             \
2754   develop(bool, TraceLivenessGen, false,                                    \
2755           "Trace the generation of liveness analysis information")          \
2756                                                                             \
2757   notproduct(bool, TraceLivenessQuery, false,                               \
2758           "Trace queries of liveness analysis information")                 \
2759                                                                             \
2760   notproduct(bool, CollectIndexSetStatistics, false,                        \
2761           "Collect information about IndexSets")                            \
2762                                                                             \
2763   develop(bool, UseLoopSafepoints, true,                                    \
2764           "Generate Safepoint nodes in every loop")                         \
2765                                                                             \
2766   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2767           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2768           "Inline allocations larger than this in doublewords must go slow")\
2769                                                                             \
2770   product(bool, AggressiveOpts, false,                                      \
2771           "Enable aggressive optimizations - see arguments.cpp")            \
2772                                                                             \
2773   product_pd(uintx, TypeProfileLevel,                                       \
2774           "=XYZ, with Z: Type profiling of arguments at call; "             \
2775                      "Y: Type profiling of return value at call; "          \
2776                      "X: Type profiling of parameters to methods; "         \
2777           "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods")             \
2778                                                                             \
2779   product(intx, TypeProfileArgsLimit,     2,                                \
2780           "max number of call arguments to consider for type profiling")    \
2781                                                                             \
2782   product(intx, TypeProfileParmsLimit,    2,                                \
2783           "max number of incoming parameters to consider for type profiling"\
2784           ", -1 for all")                                                   \
2785                                                                             \
2786   /* statistics */                                                          \
2787   develop(bool, CountCompiledCalls, false,                                  \
2788           "Count method invocations")                                       \
2789                                                                             \
2790   notproduct(bool, CountRuntimeCalls, false,                                \
2791           "Count VM runtime calls")                                         \
2792                                                                             \
2793   develop(bool, CountJNICalls, false,                                       \
2794           "Count jni method invocations")                                   \
2795                                                                             \
2796   notproduct(bool, CountJVMCalls, false,                                    \
2797           "Count jvm method invocations")                                   \
2798                                                                             \
2799   notproduct(bool, CountRemovableExceptions, false,                         \
2800           "Count exceptions that could be replaced by branches due to "     \
2801           "inlining")                                                       \
2802                                                                             \
2803   notproduct(bool, ICMissHistogram, false,                                  \
2804           "Produce histogram of IC misses")                                 \
2805                                                                             \
2806   notproduct(bool, PrintClassStatistics, false,                             \
2807           "Print class statistics at end of run")                           \
2808                                                                             \
2809   notproduct(bool, PrintMethodStatistics, false,                            \
2810           "Print method statistics at end of run")                          \
2811                                                                             \
2812   /* interpreter */                                                         \
2813   develop(bool, ClearInterpreterLocals, false,                              \
2814           "Always clear local variables of interpreter activations upon "   \
2815           "entry")                                                          \
2816                                                                             \
2817   product_pd(bool, RewriteBytecodes,                                        \
2818           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2819                                                                             \
2820   product_pd(bool, RewriteFrequentPairs,                                    \
2821           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2822                                                                             \
2823   diagnostic(bool, PrintInterpreter, false,                                 \
2824           "Print the generated interpreter code")                           \
2825                                                                             \
2826   product(bool, UseInterpreter, true,                                       \
2827           "Use interpreter for non-compiled methods")                       \
2828                                                                             \
2829   develop(bool, UseFastSignatureHandlers, true,                             \
2830           "Use fast signature handlers for native calls")                   \
2831                                                                             \
2832   product(bool, UseLoopCounter, true,                                       \
2833           "Increment invocation counter on backward branch")                \
2834                                                                             \
2835   product(bool, UseFastEmptyMethods, true,                                  \
2836           "Use fast method entry code for empty methods")                   \
2837                                                                             \
2838   product(bool, UseFastAccessorMethods, true,                               \
2839           "Use fast method entry code for accessor methods")                \
2840                                                                             \
2841   product_pd(bool, UseOnStackReplacement,                                   \
2842           "Use on stack replacement, calls runtime if invoc. counter "      \
2843           "overflows in loop")                                              \
2844                                                                             \
2845   notproduct(bool, TraceOnStackReplacement, false,                          \
2846           "Trace on stack replacement")                                     \
2847                                                                             \
2848   product_pd(bool, PreferInterpreterNativeStubs,                            \
2849           "Use always interpreter stubs for native methods invoked via "    \
2850           "interpreter")                                                    \
2851                                                                             \
2852   develop(bool, CountBytecodes, false,                                      \
2853           "Count number of bytecodes executed")                             \
2854                                                                             \
2855   develop(bool, PrintBytecodeHistogram, false,                              \
2856           "Print histogram of the executed bytecodes")                      \
2857                                                                             \
2858   develop(bool, PrintBytecodePairHistogram, false,                          \
2859           "Print histogram of the executed bytecode pairs")                 \
2860                                                                             \
2861   diagnostic(bool, PrintSignatureHandlers, false,                           \
2862           "Print code generated for native method signature handlers")      \
2863                                                                             \
2864   develop(bool, VerifyOops, false,                                          \
2865           "Do plausibility checks for oops")                                \
2866                                                                             \
2867   develop(bool, CheckUnhandledOops, false,                                  \
2868           "Check for unhandled oops in VM code")                            \
2869                                                                             \
2870   develop(bool, VerifyJNIFields, trueInDebug,                               \
2871           "Verify jfieldIDs for instance fields")                           \
2872                                                                             \
2873   notproduct(bool, VerifyJNIEnvThread, false,                               \
2874           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2875           "from JNI")                                                       \
2876                                                                             \
2877   develop(bool, VerifyFPU, false,                                           \
2878           "Verify FPU state (check for NaN's, etc.)")                       \
2879                                                                             \
2880   develop(bool, VerifyThread, false,                                        \
2881           "Watch the thread register for corruption (SPARC only)")          \
2882                                                                             \
2883   develop(bool, VerifyActivationFrameSize, false,                           \
2884           "Verify that activation frame didn't become smaller than its "    \
2885           "minimal size")                                                   \
2886                                                                             \
2887   develop(bool, TraceFrequencyInlining, false,                              \
2888           "Trace frequency based inlining")                                 \
2889                                                                             \
2890   develop_pd(bool, InlineIntrinsics,                                        \
2891           "Inline intrinsics that can be statically resolved")              \
2892                                                                             \
2893   product_pd(bool, ProfileInterpreter,                                      \
2894           "Profile at the bytecode level during interpretation")            \
2895                                                                             \
2896   develop(bool, TraceProfileInterpreter, false,                             \
2897           "Trace profiling at the bytecode level during interpretation. "   \
2898           "This outputs the profiling information collected to improve "    \
2899           "jit compilation.")                                               \
2900                                                                             \
2901   develop_pd(bool, ProfileTraps,                                            \
2902           "Profile deoptimization traps at the bytecode level")             \
2903                                                                             \
2904   product(intx, ProfileMaturityPercentage, 20,                              \
2905           "number of method invocations/branches (expressed as % of "       \
2906           "CompileThreshold) before using the method's profile")            \
2907                                                                             \
2908   develop(bool, PrintMethodData, false,                                     \
2909           "Print the results of +ProfileInterpreter at end of run")         \
2910                                                                             \
2911   develop(bool, VerifyDataPointer, trueInDebug,                             \
2912           "Verify the method data pointer during interpreter profiling")    \
2913                                                                             \
2914   develop(bool, VerifyCompiledCode, false,                                  \
2915           "Include miscellaneous runtime verifications in nmethod code; "   \
2916           "default off because it disturbs nmethod size heuristics")        \
2917                                                                             \
2918   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2919           "Manually make GC thread crash then dump java stack trace;  "     \
2920           "Test only")                                                      \
2921                                                                             \
2922   /* compilation */                                                         \
2923   product(bool, UseCompiler, true,                                          \
2924           "Use Just-In-Time compilation")                                   \
2925                                                                             \
2926   develop(bool, TraceCompilationPolicy, false,                              \
2927           "Trace compilation policy")                                       \
2928                                                                             \
2929   develop(bool, TimeCompilationPolicy, false,                               \
2930           "Time the compilation policy")                                    \
2931                                                                             \
2932   product(bool, UseCounterDecay, true,                                      \
2933           "Adjust recompilation counters")                                  \
2934                                                                             \
2935   develop(intx, CounterHalfLifeTime,    30,                                 \
2936           "Half-life time of invocation counters (in seconds)")             \
2937                                                                             \
2938   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2939           "The minimum interval (in milliseconds) between invocation of "   \
2940           "CounterDecay")                                                   \
2941                                                                             \
2942   product(bool, AlwaysCompileLoopMethods, false,                            \
2943           "When using recompilation, never interpret methods "              \
2944           "containing loops")                                               \
2945                                                                             \
2946   product(bool, DontCompileHugeMethods, true,                               \
2947           "Do not compile methods > HugeMethodLimit")                       \
2948                                                                             \
2949   /* Bytecode escape analysis estimation. */                                \
2950   product(bool, EstimateArgEscape, true,                                    \
2951           "Analyze bytecodes to estimate escape state of arguments")        \
2952                                                                             \
2953   product(intx, BCEATraceLevel, 0,                                          \
2954           "How much tracing to do of bytecode escape analysis estimates")   \
2955                                                                             \
2956   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2957           "Maximum number of nested calls that are analyzed by BC EA")      \
2958                                                                             \
2959   product(intx, MaxBCEAEstimateSize, 150,                                   \
2960           "Maximum bytecode size of a method to be analyzed by BC EA")      \
2961                                                                             \
2962   product(intx,  AllocatePrefetchStyle, 1,                                  \
2963           "0 = no prefetch, "                                               \
2964           "1 = prefetch instructions for each allocation, "                 \
2965           "2 = use TLAB watermark to gate allocation prefetch, "            \
2966           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2967                                                                             \
2968   product(intx,  AllocatePrefetchDistance, -1,                              \
2969           "Distance to prefetch ahead of allocation pointer")               \
2970                                                                             \
2971   product(intx,  AllocatePrefetchLines, 3,                                  \
2972           "Number of lines to prefetch ahead of array allocation pointer")  \
2973                                                                             \
2974   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2975           "Number of lines to prefetch ahead of instance allocation "       \
2976           "pointer")                                                        \
2977                                                                             \
2978   product(intx,  AllocatePrefetchStepSize, 16,                              \
2979           "Step size in bytes of sequential prefetch instructions")         \
2980                                                                             \
2981   product(intx,  AllocatePrefetchInstr, 0,                                  \
2982           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2983                                                                             \
2984   /* deoptimization */                                                      \
2985   develop(bool, TraceDeoptimization, false,                                 \
2986           "Trace deoptimization")                                           \
2987                                                                             \
2988   develop(bool, DebugDeoptimization, false,                                 \
2989           "Tracing various information while debugging deoptimization")     \
2990                                                                             \
2991   product(intx, SelfDestructTimer, 0,                                       \
2992           "Will cause VM to terminate after a given time (in minutes) "     \
2993           "(0 means off)")                                                  \
2994                                                                             \
2995   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2996           "The maximum number of lines in the stack trace for Java "        \
2997           "exceptions (0 means all)")                                       \
2998                                                                             \
2999   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
3000           "Guarantee a safepoint (at least) every so many milliseconds "    \
3001           "(0 means none)"))                                                \
3002                                                                             \
3003   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
3004           "Guarantee a safepoint (at least) every so many milliseconds "    \
3005           "(0 means none)"))                                                \
3006                                                                             \
3007   product(intx, SafepointTimeoutDelay, 10000,                               \
3008           "Delay in milliseconds for option SafepointTimeout")              \
3009                                                                             \
3010   product(intx, NmethodSweepFraction, 16,                                   \
3011           "Number of invocations of sweeper to cover all nmethods")         \
3012                                                                             \
3013   product(intx, NmethodSweepCheckInterval, 5,                               \
3014           "Compilers wake up every n seconds to possibly sweep nmethods")   \
3015                                                                             \
3016   product(intx, NmethodSweepActivity, 10,                                   \
3017           "Removes cold nmethods from code cache if > 0. Higher values "    \
3018           "result in more aggressive sweeping")                             \
3019                                                                             \
3020   notproduct(bool, LogSweeper, false,                                       \
3021           "Keep a ring buffer of sweeper activity")                         \
3022                                                                             \
3023   notproduct(intx, SweeperLogEntries, 1024,                                 \
3024           "Number of records in the ring buffer of sweeper activity")       \
3025                                                                             \
3026   notproduct(intx, MemProfilingInterval, 500,                               \
3027           "Time between each invocation of the MemProfiler")                \
3028                                                                             \
3029   develop(intx, MallocCatchPtr, -1,                                         \
3030           "Hit breakpoint when mallocing/freeing this pointer")             \
3031                                                                             \
3032   notproduct(intx, AssertRepeat, 1,                                         \
3033           "number of times to evaluate expression in assert "               \
3034           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
3035                                                                             \
3036   notproduct(ccstrlist, SuppressErrorAt, "",                                \
3037           "List of assertions (file:line) to muzzle")                       \
3038                                                                             \
3039   notproduct(uintx, HandleAllocationLimit, 1024,                            \
3040           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
3041           "is used")                                                        \
3042                                                                             \
3043   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
3044           "Threshold for total handle allocation when "                     \
3045           "+TraceHandleAllocation is used")                                 \
3046                                                                             \
3047   develop(intx, StackPrintLimit, 100,                                       \
3048           "number of stack frames to print in VM-level stack dump")         \
3049                                                                             \
3050   notproduct(intx, MaxElementPrintSize, 256,                                \
3051           "maximum number of elements to print")                            \
3052                                                                             \
3053   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
3054           "maximum number of subklasses to print when printing klass")      \
3055                                                                             \
3056   product(intx, MaxInlineLevel, 9,                                          \
3057           "maximum number of nested calls that are inlined")                \
3058                                                                             \
3059   product(intx, MaxRecursiveInlineLevel, 1,                                 \
3060           "maximum number of nested recursive calls that are inlined")      \
3061                                                                             \
3062   develop(intx, MaxForceInlineLevel, 100,                                   \
3063           "maximum number of nested calls that are forced for inlining "    \
3064           "(using CompilerOracle or marked w/ @ForceInline)")               \
3065                                                                             \
3066   product_pd(intx, InlineSmallCode,                                         \
3067           "Only inline already compiled methods if their code size is "     \
3068           "less than this")                                                 \
3069                                                                             \
3070   product(intx, MaxInlineSize, 35,                                          \
3071           "The maximum bytecode size of a method to be inlined")            \
3072                                                                             \
3073   product_pd(intx, FreqInlineSize,                                          \
3074           "The maximum bytecode size of a frequent method to be inlined")   \
3075                                                                             \
3076   product(intx, MaxTrivialSize, 6,                                          \
3077           "The maximum bytecode size of a trivial method to be inlined")    \
3078                                                                             \
3079   product(intx, MinInliningThreshold, 250,                                  \
3080           "The minimum invocation count a method needs to have to be "      \
3081           "inlined")                                                        \
3082                                                                             \
3083   develop(intx, MethodHistogramCutoff, 100,                                 \
3084           "The cutoff value for method invocation histogram (+CountCalls)") \
3085                                                                             \
3086   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
3087           "Number of interpreted methods to show in profile")               \
3088                                                                             \
3089   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
3090           "Number of compiled methods to show in profile")                  \
3091                                                                             \
3092   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
3093           "Number of stub methods to show in profile")                      \
3094                                                                             \
3095   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
3096           "Number of runtime stub nodes to show in profile")                \
3097                                                                             \
3098   product(intx, ProfileIntervalsTicks, 100,                                 \
3099           "Number of ticks between printing of interval profile "           \
3100           "(+ProfileIntervals)")                                            \
3101                                                                             \
3102   notproduct(intx, ScavengeALotInterval,     1,                             \
3103           "Interval between which scavenge will occur with +ScavengeALot")  \
3104                                                                             \
3105   notproduct(intx, FullGCALotInterval,     1,                               \
3106           "Interval between which full gc will occur with +FullGCALot")     \
3107                                                                             \
3108   notproduct(intx, FullGCALotStart,     0,                                  \
3109           "For which invocation to start FullGCAlot")                       \
3110                                                                             \
3111   notproduct(intx, FullGCALotDummies,  32*K,                                \
3112           "Dummy object allocated with +FullGCALot, forcing all objects "   \
3113           "to move")                                                        \
3114                                                                             \
3115   develop(intx, DontYieldALotInterval,    10,                               \
3116           "Interval between which yields will be dropped (milliseconds)")   \
3117                                                                             \
3118   develop(intx, MinSleepInterval,     1,                                    \
3119           "Minimum sleep() interval (milliseconds) when "                   \
3120           "ConvertSleepToYield is off (used for Solaris)")                  \
3121                                                                             \
3122   develop(intx, ProfilerPCTickThreshold,    15,                             \
3123           "Number of ticks in a PC buckets to be a hotspot")                \
3124                                                                             \
3125   notproduct(intx, DeoptimizeALotInterval,     5,                           \
3126           "Number of exits until DeoptimizeALot kicks in")                  \
3127                                                                             \
3128   notproduct(intx, ZombieALotInterval,     5,                               \
3129           "Number of exits until ZombieALot kicks in")                      \
3130                                                                             \
3131   diagnostic(intx, MallocVerifyInterval,     0,                             \
3132           "If non-zero, verify C heap after every N calls to "              \
3133           "malloc/realloc/free")                                            \
3134                                                                             \
3135   diagnostic(intx, MallocVerifyStart,     0,                                \
3136           "If non-zero, start verifying C heap after Nth call to "          \
3137           "malloc/realloc/free")                                            \
3138                                                                             \
3139   diagnostic(uintx, MallocMaxTestWords,     0,                              \
3140           "If non-zero, maximum number of words that malloc/realloc can "   \
3141           "allocate (for testing only)")                                    \
3142                                                                             \
3143   product(intx, TypeProfileWidth,     2,                                    \
3144           "Number of receiver types to record in call/cast profile")        \
3145                                                                             \
3146   develop(intx, BciProfileWidth,      2,                                    \
3147           "Number of return bci's to record in ret profile")                \
3148                                                                             \
3149   product(intx, PerMethodRecompilationCutoff, 400,                          \
3150           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3151                                                                             \
3152   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3153           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3154                                                                             \
3155   product(intx, PerMethodTrapLimit,  100,                                   \
3156           "Limit on traps (of one kind) in a method (includes inlines)")    \
3157                                                                             \
3158   experimental(intx, PerMethodSpecTrapLimit,  5000,                         \
3159           "Limit on speculative traps (of one kind) in a method (includes inlines)") \
3160                                                                             \
3161   product(intx, PerBytecodeTrapLimit,  4,                                   \
3162           "Limit on traps (of one kind) at a particular BCI")               \
3163                                                                             \
3164   experimental(intx, SpecTrapLimitExtraEntries,  3,                         \
3165           "Extra method data trap entries for speculation")                 \
3166                                                                             \
3167   develop(intx, InlineFrequencyRatio,    20,                                \
3168           "Ratio of call site execution to caller method invocation")       \
3169                                                                             \
3170   develop_pd(intx, InlineFrequencyCount,                                    \
3171           "Count of call site execution necessary to trigger frequent "     \
3172           "inlining")                                                       \
3173                                                                             \
3174   develop(intx, InlineThrowCount,    50,                                    \
3175           "Force inlining of interpreted methods that throw this often")    \
3176                                                                             \
3177   develop(intx, InlineThrowMaxSize,   200,                                  \
3178           "Force inlining of throwing methods smaller than this")           \
3179                                                                             \
3180   develop(intx, ProfilerNodeSize,  1024,                                    \
3181           "Size in K to allocate for the Profile Nodes of each thread")     \
3182                                                                             \
3183   product_pd(intx, PreInflateSpin,                                          \
3184           "Number of times to spin wait before inflation")                  \
3185                                                                             \
3186   /* gc parameters */                                                       \
3187   product(uintx, InitialHeapSize, 0,                                        \
3188           "Initial heap size (in bytes); zero means use ergonomics")        \
3189                                                                             \
3190   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3191           "Maximum heap size (in bytes)")                                   \
3192                                                                             \
3193   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3194           "Initial tenured generation size (in bytes)")                     \
3195                                                                             \
3196   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3197           "Initial new generation size (in bytes)")                         \
3198                                                                             \
3199   product(uintx, MaxNewSize, max_uintx,                                     \
3200           "Maximum new generation size (in bytes), max_uintx means set "    \
3201           "ergonomically")                                                  \
3202                                                                             \
3203   product(uintx, PretenureSizeThreshold, 0,                                 \
3204           "Maximum size in bytes of objects allocated in DefNew "           \
3205           "generation; zero means no maximum")                              \
3206                                                                             \
3207   product(uintx, TLABSize, 0,                                               \
3208           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3209                                                                             \
3210   product(uintx, MinTLABSize, 2*K,                                          \
3211           "Minimum allowed TLAB size (in bytes)")                           \
3212                                                                             \
3213   product(uintx, TLABAllocationWeight, 35,                                  \
3214           "Allocation averaging weight")                                    \
3215                                                                             \
3216   product(uintx, TLABWasteTargetPercent, 1,                                 \
3217           "Percentage of Eden that can be wasted")                          \
3218                                                                             \
3219   product(uintx, TLABRefillWasteFraction,    64,                            \
3220           "Maximum TLAB waste at a refill (internal fragmentation)")        \
3221                                                                             \
3222   product(uintx, TLABWasteIncrement,    4,                                  \
3223           "Increment allowed waste at slow allocation")                     \
3224                                                                             \
3225   product(uintx, SurvivorRatio, 8,                                          \
3226           "Ratio of eden/survivor space size")                              \
3227                                                                             \
3228   product(uintx, NewRatio, 2,                                               \
3229           "Ratio of old/new generation sizes")                              \
3230                                                                             \
3231   product_pd(uintx, NewSizeThreadIncrease,                                  \
3232           "Additional size added to desired new generation size per "       \
3233           "non-daemon thread (in bytes)")                                   \
3234                                                                             \
3235   product_pd(uintx, MetaspaceSize,                                          \
3236           "Initial size of Metaspaces (in bytes)")                          \
3237                                                                             \
3238   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3239           "Maximum size of Metaspaces (in bytes)")                          \
3240                                                                             \
3241   product(uintx, CompressedClassSpaceSize, 1*G,                             \
3242           "Maximum size of class area in Metaspace when compressed "        \
3243           "class pointers are used")                                        \
3244                                                                             \
3245   manageable(uintx, MinHeapFreeRatio, 40,                                   \
3246           "The minimum percentage of heap free after GC to avoid expansion."\
3247           " For most GCs this applies to the old generation. In G1 and"     \
3248           " ParallelGC it applies to the whole heap.")                      \
3249                                                                             \
3250   manageable(uintx, MaxHeapFreeRatio, 70,                                   \
3251           "The maximum percentage of heap free after GC to avoid shrinking."\
3252           " For most GCs this applies to the old generation. In G1 and"     \
3253           " ParallelGC it applies to the whole heap.")                      \
3254                                                                             \
3255   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3256           "Number of milliseconds per MB of free space in the heap")        \
3257                                                                             \
3258   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3259           "The minimum change in heap space due to GC (in bytes)")          \
3260                                                                             \
3261   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3262           "The minimum expansion of Metaspace (in bytes)")                  \
3263                                                                             \
3264   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3265           "The minimum percentage of Metaspace free after GC to avoid "     \
3266           "expansion")                                                      \
3267                                                                             \
3268   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3269           "The maximum percentage of Metaspace free after GC to avoid "     \
3270           "shrinking")                                                      \
3271                                                                             \
3272   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3273           "The maximum expansion of Metaspace without full GC (in bytes)")  \
3274                                                                             \
3275   product(uintx, QueuedAllocationWarningCount, 0,                           \
3276           "Number of times an allocation that queues behind a GC "          \
3277           "will retry before printing a warning")                           \
3278                                                                             \
3279   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3280           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3281                                                                             \
3282   diagnostic(intx, VerifyGCLevel,     0,                                    \
3283           "Generation level at which to start +VerifyBefore/AfterGC")       \
3284                                                                             \
3285   product(uintx, MaxTenuringThreshold,    15,                               \
3286           "Maximum value for tenuring threshold")                           \
3287                                                                             \
3288   product(uintx, InitialTenuringThreshold,    7,                            \
3289           "Initial value for tenuring threshold")                           \
3290                                                                             \
3291   product(uintx, TargetSurvivorRatio,    50,                                \
3292           "Desired percentage of survivor space used after scavenge")       \
3293                                                                             \
3294   product(uintx, MarkSweepDeadRatio,     5,                                 \
3295           "Percentage (0-100) of the old gen allowed as dead wood. "        \
3296           "Serial mark sweep treats this as both the minimum and maximum "  \
3297           "value. "                                                         \
3298           "CMS uses this value only if it falls back to mark sweep. "       \
3299           "Par compact uses a variable scale based on the density of the "  \
3300           "generation and treats this as the maximum value when the heap "  \
3301           "is either completely full or completely empty.  Par compact "    \
3302           "also has a smaller default value; see arguments.cpp.")           \
3303                                                                             \
3304   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3305           "How often should we fully compact the heap (ignoring the dead "  \
3306           "space parameters)")                                              \
3307                                                                             \
3308   product(intx, PrintCMSStatistics, 0,                                      \
3309           "Statistics for CMS")                                             \
3310                                                                             \
3311   product(bool, PrintCMSInitiationStatistics, false,                        \
3312           "Statistics for initiating a CMS collection")                     \
3313                                                                             \
3314   product(intx, PrintFLSStatistics, 0,                                      \
3315           "Statistics for CMS' FreeListSpace")                              \
3316                                                                             \
3317   product(intx, PrintFLSCensus, 0,                                          \
3318           "Census for CMS' FreeListSpace")                                  \
3319                                                                             \
3320   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3321           "Delay between expansion and allocation (in milliseconds)")       \
3322                                                                             \
3323   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3324           "Delay in scheduling GC workers (in milliseconds)")               \
3325                                                                             \
3326   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3327           "(Unstable) Number of times to iterate in safepoint loop "        \
3328           "before blocking VM threads ")                                    \
3329                                                                             \
3330   product(intx, DeferPollingPageLoopCount,     -1,                          \
3331           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3332           "before changing safepoint polling page to RO ")                  \
3333                                                                             \
3334   product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)")               \
3335                                                                             \
3336   product(bool, PSChunkLargeArrays, true,                                   \
3337           "Process large arrays in chunks")                                 \
3338                                                                             \
3339   product(uintx, GCDrainStackTargetSize, 64,                                \
3340           "Number of entries we will try to leave on the stack "            \
3341           "during parallel gc")                                             \
3342                                                                             \
3343   /* stack parameters */                                                    \
3344   product_pd(intx, StackYellowPages,                                        \
3345           "Number of yellow zone (recoverable overflows) pages")            \
3346                                                                             \
3347   product_pd(intx, StackRedPages,                                           \
3348           "Number of red zone (unrecoverable overflows) pages")             \
3349                                                                             \
3350   product_pd(intx, StackShadowPages,                                        \
3351           "Number of shadow zone (for overflow checking) pages "            \
3352           "this should exceed the depth of the VM and native call stack")   \
3353                                                                             \
3354   product_pd(intx, ThreadStackSize,                                         \
3355           "Thread Stack Size (in Kbytes)")                                  \
3356                                                                             \
3357   product_pd(intx, VMThreadStackSize,                                       \
3358           "Non-Java Thread Stack Size (in Kbytes)")                         \
3359                                                                             \
3360   product_pd(intx, CompilerThreadStackSize,                                 \
3361           "Compiler Thread Stack Size (in Kbytes)")                         \
3362                                                                             \
3363   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3364           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3365                                                                             \
3366   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3367           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3368           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3369           "disable this feature")                                           \
3370                                                                             \
3371   /* code cache parameters */                                               \
3372   /* ppc64 has large code-entry alignment. */                               \
3373   develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64),                  \
3374           "Code cache segment size (in bytes) - smallest unit of "          \
3375           "allocation")                                                     \
3376                                                                             \
3377   develop_pd(intx, CodeEntryAlignment,                                      \
3378           "Code entry alignment for generated code (in bytes)")             \
3379                                                                             \
3380   product_pd(intx, OptoLoopAlignment,                                       \
3381           "Align inner loops to zero relative to this modulus")             \
3382                                                                             \
3383   product_pd(uintx, InitialCodeCacheSize,                                   \
3384           "Initial code cache size (in bytes)")                             \
3385                                                                             \
3386   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3387           "Minimum code cache size (in bytes) required to start VM.")       \
3388                                                                             \
3389   product_pd(uintx, ReservedCodeCacheSize,                                  \
3390           "Reserved code cache size (in bytes) - maximum code cache size")  \
3391                                                                             \
3392   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3393           "When less than X space left, we stop compiling")                 \
3394                                                                             \
3395   product_pd(uintx, CodeCacheExpansionSize,                                 \
3396           "Code cache expansion size (in bytes)")                           \
3397                                                                             \
3398   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3399           "Minimum number of segments in a code cache block")               \
3400                                                                             \
3401   notproduct(bool, ExitOnFullCodeCache, false,                              \
3402           "Exit the VM if we fill the code cache")                          \
3403                                                                             \
3404   product(bool, UseCodeCacheFlushing, true,                                 \
3405           "Remove cold/old nmethods from the code cache")                   \
3406                                                                             \
3407   /* interpreter debugging */                                               \
3408   develop(intx, BinarySwitchThreshold, 5,                                   \
3409           "Minimal number of lookupswitch entries for rewriting to binary " \
3410           "switch")                                                         \
3411                                                                             \
3412   develop(intx, StopInterpreterAt, 0,                                       \
3413           "Stop interpreter execution at specified bytecode number")        \
3414                                                                             \
3415   develop(intx, TraceBytecodesAt, 0,                                        \
3416           "Trace bytecodes starting with specified bytecode number")        \
3417                                                                             \
3418   /* compiler interface */                                                  \
3419   develop(intx, CIStart, 0,                                                 \
3420           "The id of the first compilation to permit")                      \
3421                                                                             \
3422   develop(intx, CIStop, max_jint,                                           \
3423           "The id of the last compilation to permit")                       \
3424                                                                             \
3425   develop(intx, CIStartOSR, 0,                                              \
3426           "The id of the first osr compilation to permit "                  \
3427           "(CICountOSR must be on)")                                        \
3428                                                                             \
3429   develop(intx, CIStopOSR, max_jint,                                        \
3430           "The id of the last osr compilation to permit "                   \
3431           "(CICountOSR must be on)")                                        \
3432                                                                             \
3433   develop(intx, CIBreakAtOSR, -1,                                           \
3434           "The id of osr compilation to break at")                          \
3435                                                                             \
3436   develop(intx, CIBreakAt, -1,                                              \
3437           "The id of compilation to break at")                              \
3438                                                                             \
3439   product(ccstrlist, CompileOnly, "",                                       \
3440           "List of methods (pkg/class.name) to restrict compilation to")    \
3441                                                                             \
3442   product(ccstr, CompileCommandFile, NULL,                                  \
3443           "Read compiler commands from this file [.hotspot_compiler]")      \
3444                                                                             \
3445   product(ccstrlist, CompileCommand, "",                                    \
3446           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3447                                                                             \
3448   develop(bool, ReplayCompiles, false,                                      \
3449           "Enable replay of compilations from ReplayDataFile")              \
3450                                                                             \
3451   product(ccstr, ReplayDataFile, NULL,                                      \
3452           "File containing compilation replay information"                  \
3453           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3454                                                                             \
3455    product(ccstr, InlineDataFile, NULL,                                     \
3456           "File containing inlining replay information"                     \
3457           "[default: ./inline_pid%p.log] (%p replaced with pid)")           \
3458                                                                             \
3459   develop(intx, ReplaySuppressInitializers, 2,                              \
3460           "Control handling of class initialization during replay: "        \
3461           "0 - don't do anything special; "                                 \
3462           "1 - treat all class initializers as empty; "                     \
3463           "2 - treat class initializers for application classes as empty; " \
3464           "3 - allow all class initializers to run during bootstrap but "   \
3465           "    pretend they are empty after starting replay")               \
3466                                                                             \
3467   develop(bool, ReplayIgnoreInitErrors, false,                              \
3468           "Ignore exceptions thrown during initialization for replay")      \
3469                                                                             \
3470   product(bool, DumpReplayDataOnError, true,                                \
3471           "Record replay data for crashing compiler threads")               \
3472                                                                             \
3473   product(bool, CICompilerCountPerCPU, false,                               \
3474           "1 compiler thread for log(N CPUs)")                              \
3475                                                                             \
3476   develop(intx, CIFireOOMAt,    -1,                                         \
3477           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3478           "(non-negative value throws OOM after this many CI accesses "     \
3479           "in each compile)")                                               \
3480   notproduct(intx, CICrashAt, -1,                                           \
3481           "id of compilation to trigger assert in compiler thread for "     \
3482           "the purpose of testing, e.g. generation of replay data")         \
3483   notproduct(bool, CIObjectFactoryVerify, false,                            \
3484           "enable potentially expensive verification in ciObjectFactory")   \
3485                                                                             \
3486   /* Priorities */                                                          \
3487   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3488                                                                             \
3489   product(intx, ThreadPriorityPolicy, 0,                                    \
3490           "0 : Normal.                                                     "\
3491           "    VM chooses priorities that are appropriate for normal       "\
3492           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3493           "    to normal native priority. Java priorities below "           \
3494           "    NORM_PRIORITY map to lower native priority values. On       "\
3495           "    Windows applications are allowed to use higher native       "\
3496           "    priorities. However, with ThreadPriorityPolicy=0, VM will   "\
3497           "    not use the highest possible native priority,               "\
3498           "    THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with     "\
3499           "    system threads. On Linux thread priorities are ignored      "\
3500           "    because the OS does not support static priority in          "\
3501           "    SCHED_OTHER scheduling class which is the only choice for   "\
3502           "    non-root, non-realtime applications.                        "\
3503           "1 : Aggressive.                                                 "\
3504           "    Java thread priorities map over to the entire range of      "\
3505           "    native thread priorities. Higher Java thread priorities map "\
3506           "    to higher native thread priorities. This policy should be   "\
3507           "    used with care, as sometimes it can cause performance       "\
3508           "    degradation in the application and/or the entire system. On "\
3509           "    Linux this policy requires root privilege.")                 \
3510                                                                             \
3511   product(bool, ThreadPriorityVerbose, false,                               \
3512           "Print priority changes")                                         \
3513                                                                             \
3514   product(intx, DefaultThreadPriority, -1,                                  \
3515           "The native priority at which threads run if not elsewhere "      \
3516           "specified (-1 means no change)")                                 \
3517                                                                             \
3518   product(intx, CompilerThreadPriority, -1,                                 \
3519           "The native priority at which compiler threads should run "       \
3520           "(-1 means no change)")                                           \
3521                                                                             \
3522   product(intx, VMThreadPriority, -1,                                       \
3523           "The native priority at which the VM thread should run "          \
3524           "(-1 means no change)")                                           \
3525                                                                             \
3526   product(bool, CompilerThreadHintNoPreempt, true,                          \
3527           "(Solaris only) Give compiler threads an extra quanta")           \
3528                                                                             \
3529   product(bool, VMThreadHintNoPreempt, false,                               \
3530           "(Solaris only) Give VM thread an extra quanta")                  \
3531                                                                             \
3532   product(intx, JavaPriority1_To_OSPriority, -1,                            \
3533           "Map Java priorities to OS priorities")                           \
3534                                                                             \
3535   product(intx, JavaPriority2_To_OSPriority, -1,                            \
3536           "Map Java priorities to OS priorities")                           \
3537                                                                             \
3538   product(intx, JavaPriority3_To_OSPriority, -1,                            \
3539           "Map Java priorities to OS priorities")                           \
3540                                                                             \
3541   product(intx, JavaPriority4_To_OSPriority, -1,                            \
3542           "Map Java priorities to OS priorities")                           \
3543                                                                             \
3544   product(intx, JavaPriority5_To_OSPriority, -1,                            \
3545           "Map Java priorities to OS priorities")                           \
3546                                                                             \
3547   product(intx, JavaPriority6_To_OSPriority, -1,                            \
3548           "Map Java priorities to OS priorities")                           \
3549                                                                             \
3550   product(intx, JavaPriority7_To_OSPriority, -1,                            \
3551           "Map Java priorities to OS priorities")                           \
3552                                                                             \
3553   product(intx, JavaPriority8_To_OSPriority, -1,                            \
3554           "Map Java priorities to OS priorities")                           \
3555                                                                             \
3556   product(intx, JavaPriority9_To_OSPriority, -1,                            \
3557           "Map Java priorities to OS priorities")                           \
3558                                                                             \
3559   product(intx, JavaPriority10_To_OSPriority,-1,                            \
3560           "Map Java priorities to OS priorities")                           \
3561                                                                             \
3562   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3563           "Java thread priority 10 maps to critical scheduling priority")   \
3564                                                                             \
3565   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3566           "Compiler thread(s) run at critical scheduling priority")         \
3567                                                                             \
3568   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3569           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3570                                                                             \
3571   /* compiler debugging */                                                  \
3572   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3573           "First class to consider when using +CompileTheWorld")            \
3574                                                                             \
3575   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3576           "Last class to consider when using +CompileTheWorld")             \
3577                                                                             \
3578   develop(intx, NewCodeParameter,      0,                                   \
3579           "Testing Only: Create a dedicated integer parameter before "      \
3580           "putback")                                                        \
3581                                                                             \
3582   /* new oopmap storage allocation */                                       \
3583   develop(intx, MinOopMapAllocation,     8,                                 \
3584           "Minimum number of OopMap entries in an OopMapSet")               \
3585                                                                             \
3586   /* Background Compilation */                                              \
3587   develop(intx, LongCompileThreshold,     50,                               \
3588           "Used with +TraceLongCompiles")                                   \
3589                                                                             \
3590   product(intx, StarvationMonitorInterval,    200,                          \
3591           "Pause between each check (in milliseconds)")                     \
3592                                                                             \
3593   /* recompilation */                                                       \
3594   product_pd(intx, CompileThreshold,                                        \
3595           "number of interpreted method invocations before (re-)compiling") \
3596                                                                             \
3597   product_pd(intx, BackEdgeThreshold,                                       \
3598           "Interpreter Back edge threshold at which an OSR compilation is " \
3599           "invoked")                                                        \
3600                                                                             \
3601   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3602           "Interpreter (tier 0) invocation notification frequency")         \
3603                                                                             \
3604   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3605           "C1 without MDO (tier 2) invocation notification frequency")      \
3606                                                                             \
3607   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3608           "C1 with MDO profiling (tier 3) invocation notification "         \
3609           "frequency")                                                      \
3610                                                                             \
3611   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3612           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3613                                                                             \
3614   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3615           "Interpreter (tier 0) invocation notification frequency")         \
3616                                                                             \
3617   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3618           "C1 without MDO (tier 2) invocation notification frequency")      \
3619                                                                             \
3620   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3621           "C1 with MDO profiling (tier 3) invocation notification "         \
3622           "frequency")                                                      \
3623                                                                             \
3624   product(intx, Tier2CompileThreshold, 0,                                   \
3625           "threshold at which tier 2 compilation is invoked")               \
3626                                                                             \
3627   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3628           "Back edge threshold at which tier 2 compilation is invoked")     \
3629                                                                             \
3630   product(intx, Tier3InvocationThreshold, 200,                              \
3631           "Compile if number of method invocations crosses this "           \
3632           "threshold")                                                      \
3633                                                                             \
3634   product(intx, Tier3MinInvocationThreshold, 100,                           \
3635           "Minimum invocation to compile at tier 3")                        \
3636                                                                             \
3637   product(intx, Tier3CompileThreshold, 2000,                                \
3638           "Threshold at which tier 3 compilation is invoked (invocation "   \
3639           "minimum must be satisfied")                                      \
3640                                                                             \
3641   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3642           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3643                                                                             \
3644   product(intx, Tier4InvocationThreshold, 5000,                             \
3645           "Compile if number of method invocations crosses this "           \
3646           "threshold")                                                      \
3647                                                                             \
3648   product(intx, Tier4MinInvocationThreshold, 600,                           \
3649           "Minimum invocation to compile at tier 4")                        \
3650                                                                             \
3651   product(intx, Tier4CompileThreshold, 15000,                               \
3652           "Threshold at which tier 4 compilation is invoked (invocation "   \
3653           "minimum must be satisfied")                                      \
3654                                                                             \
3655   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3656           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3657                                                                             \
3658   product(intx, Tier3DelayOn, 5,                                            \
3659           "If C2 queue size grows over this amount per compiler thread "    \
3660           "stop compiling at tier 3 and start compiling at tier 2")         \
3661                                                                             \
3662   product(intx, Tier3DelayOff, 2,                                           \
3663           "If C2 queue size is less than this amount per compiler thread "  \
3664           "allow methods compiled at tier 2 transition to tier 3")          \
3665                                                                             \
3666   product(intx, Tier3LoadFeedback, 5,                                       \
3667           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3668           "reaches this amount per compiler thread")                        \
3669                                                                             \
3670   product(intx, Tier4LoadFeedback, 3,                                       \
3671           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3672           "reaches this amount per compiler thread")                        \
3673                                                                             \
3674   product(intx, TieredCompileTaskTimeout, 50,                               \
3675           "Kill compile task if method was not used within "                \
3676           "given timeout in milliseconds")                                  \
3677                                                                             \
3678   product(intx, TieredStopAtLevel, 4,                                       \
3679           "Stop at given compilation level")                                \
3680                                                                             \
3681   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3682           "Start profiling in interpreter if the counters exceed tier 3 "   \
3683           "thresholds by the specified percentage")                         \
3684                                                                             \
3685   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3686           "Increase the compile threshold for C1 compilation if the code "  \
3687           "cache is filled by the specified percentage")                    \
3688                                                                             \
3689   product(intx, TieredRateUpdateMinTime, 1,                                 \
3690           "Minimum rate sampling interval (in milliseconds)")               \
3691                                                                             \
3692   product(intx, TieredRateUpdateMaxTime, 25,                                \
3693           "Maximum rate sampling interval (in milliseconds)")               \
3694                                                                             \
3695   product_pd(bool, TieredCompilation,                                       \
3696           "Enable tiered compilation")                                      \
3697                                                                             \
3698   product(bool, PrintTieredEvents, false,                                   \
3699           "Print tiered events notifications")                              \
3700                                                                             \
3701   product_pd(intx, OnStackReplacePercentage,                                \
3702           "NON_TIERED number of method invocations/branches (expressed as " \
3703           "% of CompileThreshold) before (re-)compiling OSR code")          \
3704                                                                             \
3705   product(intx, InterpreterProfilePercentage, 33,                           \
3706           "NON_TIERED number of method invocations/branches (expressed as " \
3707           "% of CompileThreshold) before profiling in the interpreter")     \
3708                                                                             \
3709   develop(intx, MaxRecompilationSearchLength,    10,                        \
3710           "The maximum number of frames to inspect when searching for "     \
3711           "recompilee")                                                     \
3712                                                                             \
3713   develop(intx, MaxInterpretedSearchLength,     3,                          \
3714           "The maximum number of interpreted frames to skip when searching "\
3715           "for recompilee")                                                 \
3716                                                                             \
3717   develop(intx, DesiredMethodLimit,  8000,                                  \
3718           "The desired maximum method size (in bytecodes) after inlining")  \
3719                                                                             \
3720   develop(intx, HugeMethodLimit,  8000,                                     \
3721           "Don't compile methods larger than this if "                      \
3722           "+DontCompileHugeMethods")                                        \
3723                                                                             \
3724   /* New JDK 1.4 reflection implementation */                               \
3725                                                                             \
3726   develop(bool, UseNewReflection, true,                                     \
3727           "Temporary flag for transition to reflection based on dynamic "   \
3728           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3729           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3730           "changes were needed")                                            \
3731                                                                             \
3732   develop(bool, VerifyReflectionBytecodes, false,                           \
3733           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3734           "in situations like that described in 4486457 or for "            \
3735           "constructors generated for serialization, so can not be enabled "\
3736           "in product.")                                                    \
3737                                                                             \
3738   product(bool, ReflectionWrapResolutionErrors, true,                       \
3739           "Temporary flag for transition to AbstractMethodError wrapped "   \
3740           "in InvocationTargetException. See 6531596")                      \
3741                                                                             \
3742   develop(intx, FastSuperclassLimit, 8,                                     \
3743           "Depth of hardwired instanceof accelerator array")                \
3744                                                                             \
3745   /* Properties for Java libraries  */                                      \
3746                                                                             \
3747   product(uintx, MaxDirectMemorySize, 0,                                    \
3748           "Maximum total size of NIO direct-buffer allocations")            \
3749                                                                             \
3750   /* temporary developer defined flags  */                                  \
3751                                                                             \
3752   diagnostic(bool, UseNewCode, false,                                       \
3753           "Testing Only: Use the new version while testing")                \
3754                                                                             \
3755   diagnostic(bool, UseNewCode2, false,                                      \
3756           "Testing Only: Use the new version while testing")                \
3757                                                                             \
3758   diagnostic(bool, UseNewCode3, false,                                      \
3759           "Testing Only: Use the new version while testing")                \
3760                                                                             \
3761   /* flags for performance data collection */                               \
3762                                                                             \
3763   product(bool, UsePerfData, falseInEmbedded,                               \
3764           "Flag to disable jvmstat instrumentation for performance testing "\
3765           "and problem isolation purposes")                                 \
3766                                                                             \
3767   product(bool, PerfDataSaveToFile, false,                                  \
3768           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3769                                                                             \
3770   product(ccstr, PerfDataSaveFile, NULL,                                    \
3771           "Save PerfData memory to the specified absolute pathname. "       \
3772           "The string %p in the file name (if present) "                    \
3773           "will be replaced by pid")                                        \
3774                                                                             \
3775   product(intx, PerfDataSamplingInterval, 50,                               \
3776           "Data sampling interval (in milliseconds)")                       \
3777                                                                             \
3778   develop(bool, PerfTraceDataCreation, false,                               \
3779           "Trace creation of Performance Data Entries")                     \
3780                                                                             \
3781   develop(bool, PerfTraceMemOps, false,                                     \
3782           "Trace PerfMemory create/attach/detach calls")                    \
3783                                                                             \
3784   product(bool, PerfDisableSharedMem, false,                                \
3785           "Store performance data in standard memory")                      \
3786                                                                             \
3787   product(intx, PerfDataMemorySize, 32*K,                                   \
3788           "Size of performance data memory region. Will be rounded "        \
3789           "up to a multiple of the native os page size.")                   \
3790                                                                             \
3791   product(intx, PerfMaxStringConstLength, 1024,                             \
3792           "Maximum PerfStringConstant string length before truncation")     \
3793                                                                             \
3794   product(bool, PerfAllowAtExitRegistration, false,                         \
3795           "Allow registration of atexit() methods")                         \
3796                                                                             \
3797   product(bool, PerfBypassFileSystemCheck, false,                           \
3798           "Bypass Win32 file system criteria checks (Windows Only)")        \
3799                                                                             \
3800   product(intx, UnguardOnExecutionViolation, 0,                             \
3801           "Unguard page and retry on no-execute fault (Win32 only) "        \
3802           "0=off, 1=conservative, 2=aggressive")                            \
3803                                                                             \
3804   /* Serviceability Support */                                              \
3805                                                                             \
3806   product(bool, ManagementServer, false,                                    \
3807           "Create JMX Management Server")                                   \
3808                                                                             \
3809   product(bool, DisableAttachMechanism, false,                              \
3810           "Disable mechanism that allows tools to attach to this VM")       \
3811                                                                             \
3812   product(bool, StartAttachListener, false,                                 \
3813           "Always start Attach Listener at VM startup")                     \
3814                                                                             \
3815   manageable(bool, PrintConcurrentLocks, false,                             \
3816           "Print java.util.concurrent locks in thread dump")                \
3817                                                                             \
3818   product(bool, TransmitErrorReport, false,                                 \
3819           "Enable error report transmission on erroneous termination")      \
3820                                                                             \
3821   product(ccstr, ErrorReportServer, NULL,                                   \
3822           "Override built-in error report server address")                  \
3823                                                                             \
3824   /* Shared spaces */                                                       \
3825                                                                             \
3826   product(bool, UseSharedSpaces, true,                                      \
3827           "Use shared spaces for metadata")                                 \
3828                                                                             \
3829   product(bool, VerifySharedSpaces, false,                                  \
3830           "Verify shared spaces (false for default archive, true for "      \
3831           "archive specified by -XX:SharedArchiveFile)")                    \
3832                                                                             \
3833   product(bool, RequireSharedSpaces, false,                                 \
3834           "Require shared spaces for metadata")                             \
3835                                                                             \
3836   product(bool, DumpSharedSpaces, false,                                    \
3837           "Special mode: JVM reads a class list, loads classes, builds "    \
3838           "shared spaces, and dumps the shared spaces to a file to be "     \
3839           "used in future JVM runs")                                        \
3840                                                                             \
3841   product(bool, PrintSharedSpaces, false,                                   \
3842           "Print usage of shared spaces")                                   \
3843                                                                             \
3844   product(bool, PrintSharedArchiveAndExit, false,                           \
3845           "Print shared archive file contents")                             \
3846                                                                             \
3847   product(bool, PrintSharedDictionary, false,                               \
3848           "If PrintSharedArchiveAndExit is true, also print the shared "    \
3849           "dictionary")                                                     \
3850                                                                             \
3851   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3852           "Size of read-write space for metadata (in bytes)")               \
3853                                                                             \
3854   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3855           "Size of read-only space for metadata (in bytes)")                \
3856                                                                             \
3857   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3858           "Size of the shared miscellaneous data area (in bytes)")          \
3859                                                                             \
3860   product(uintx, SharedMiscCodeSize,    120*K,                              \
3861           "Size of the shared miscellaneous code area (in bytes)")          \
3862                                                                             \
3863   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3864           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3865           "Address to allocate shared memory region for class data")        \
3866                                                                             \
3867   diagnostic(bool, EnableInvokeDynamic, true,                               \
3868           "support JSR 292 (method handles, invokedynamic, "                \
3869           "anonymous classes")                                              \
3870                                                                             \
3871   diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false,              \
3872           "Do not quit -Xshare:dump even if we encounter unverifiable "     \
3873           "classes. Just exclude them from the shared dictionary.")         \
3874                                                                             \
3875   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3876           "Print generated stub code for method handles")                   \
3877                                                                             \
3878   develop(bool, TraceMethodHandles, false,                                  \
3879           "trace internal method handle operations")                        \
3880                                                                             \
3881   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3882           "perform extra checks when constructing method handles")          \
3883                                                                             \
3884   diagnostic(bool, ShowHiddenFrames, false,                                 \
3885           "show method handle implementation frames (usually hidden)")      \
3886                                                                             \
3887   experimental(bool, TrustFinalNonStaticFields, false,                      \
3888           "trust final non-static declarations for constant folding")       \
3889                                                                             \
3890   diagnostic(bool, FoldStableValues, true,                                  \
3891           "Optimize loads from stable fields (marked w/ @Stable)")          \
3892                                                                             \
3893   develop(bool, TraceInvokeDynamic, false,                                  \
3894           "trace internal invoke dynamic operations")                       \
3895                                                                             \
3896   diagnostic(bool, PauseAtStartup,      false,                              \
3897           "Causes the VM to pause at startup time and wait for the pause "  \
3898           "file to be removed (default: ./vm.paused.<pid>)")                \
3899                                                                             \
3900   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3901           "The file to create and for whose removal to await when pausing " \
3902           "at startup. (default: ./vm.paused.<pid>)")                       \
3903                                                                             \
3904   diagnostic(bool, PauseAtExit, false,                                      \
3905           "Pause and wait for keypress on exit if a debugger is attached")  \
3906                                                                             \
3907   product(bool, ExtendedDTraceProbes,    false,                             \
3908           "Enable performance-impacting dtrace probes")                     \
3909                                                                             \
3910   product(bool, DTraceMethodProbes, false,                                  \
3911           "Enable dtrace probes for method-entry and method-exit")          \
3912                                                                             \
3913   product(bool, DTraceAllocProbes, false,                                   \
3914           "Enable dtrace probes for object allocation")                     \
3915                                                                             \
3916   product(bool, DTraceMonitorProbes, false,                                 \
3917           "Enable dtrace probes for monitor events")                        \
3918                                                                             \
3919   product(bool, RelaxAccessControlCheck, false,                             \
3920           "Relax the access control checks in the verifier")                \
3921                                                                             \
3922   diagnostic(bool, PrintDTraceDOF, false,                                   \
3923           "Print the DTrace DOF passed to the system for JSDT probes")      \
3924                                                                             \
3925   product(uintx, StringTableSize, defaultStringTableSize,                   \
3926           "Number of buckets in the interned String table")                 \
3927                                                                             \
3928   experimental(uintx, SymbolTableSize, defaultSymbolTableSize,              \
3929           "Number of buckets in the JVM internal Symbol table")             \
3930                                                                             \
3931   product(bool, UseStringDeduplication, false,                              \
3932           "Use string deduplication")                                       \
3933                                                                             \
3934   product(bool, PrintStringDeduplicationStatistics, false,                  \
3935           "Print string deduplication statistics")                          \
3936                                                                             \
3937   product(uintx, StringDeduplicationAgeThreshold, 3,                        \
3938           "A string must reach this age (or be promoted to an old region) " \
3939           "to be considered for deduplication")                             \
3940                                                                             \
3941   diagnostic(bool, StringDeduplicationResizeALot, false,                    \
3942           "Force table resize every time the table is scanned")             \
3943                                                                             \
3944   diagnostic(bool, StringDeduplicationRehashALot, false,                    \
3945           "Force table rehash every time the table is scanned")             \
3946                                                                             \
3947   develop(bool, TraceDefaultMethods, false,                                 \
3948           "Trace the default method processing steps")                      \
3949                                                                             \
3950   develop(bool, VerifyGenericSignatures, false,                             \
3951           "Abort VM on erroneous or inconsistent generic signatures")       \
3952                                                                             \
3953   product(bool, UseVMInterruptibleIO, false,                                \
3954           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3955           "EINTR for I/O operations results in OS_INTRPT. The default "     \
3956           "value of this flag is true for JDK 6 and earlier")               \
3957                                                                             \
3958   diagnostic(bool, WhiteBoxAPI, false,                                      \
3959           "Enable internal testing APIs")                                   \
3960                                                                             \
3961   product(bool, PrintGCCause, true,                                         \
3962           "Include GC cause in GC logging")                                 \
3963                                                                             \
3964   experimental(intx, SurvivorAlignmentInBytes, 0,                           \
3965            "Default survivor space alignment in bytes")                     \
3966                                                                             \
3967   product(bool , AllowNonVirtualCalls, false,                               \
3968           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3969                                                                             \
3970   product(ccstr, DumpLoadedClassList, NULL,                                 \
3971           "Dump the names all loaded classes, that could be stored into "   \
3972           "the CDS archive, in the specified file")                         \
3973                                                                             \
3974   product(ccstr, SharedClassListFile, NULL,                                 \
3975           "Override the default CDS class list")                            \
3976                                                                             \
3977   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3978           "Override the default location of the CDS archive file")          \
3979                                                                             \
3980   product(ccstr, ExtraSharedClassListFile, NULL,                            \
3981           "Extra classlist for building the CDS archive file")              \
3982                                                                             \
3983   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3984           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3985           "Allocation less than this value will be allocated "              \
3986           "using malloc. Larger allocations will use mmap.")                \
3987                                                                             \
3988   product(bool, EnableTracing, false,                                       \
3989           "Enable event-based tracing")                                     \
3990                                                                             \
3991   product(bool, UseLockedTracing, false,                                    \
3992           "Use locked-tracing when doing event-based tracing")              \
3993                                                                             \
3994   product_pd(bool, PreserveFramePointer,                                    \
3995              "Use the FP register for holding the frame pointer "           \
3996              "and not as a general purpose register.")
3997 
3998 /*
3999  *  Macros for factoring of globals
4000  */
4001 
4002 // Interface macros
4003 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
4004 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
4005 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
4006 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
4007 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
4008 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
4009 #ifdef PRODUCT
4010 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
4011 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
4012 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
4013 #else
4014 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
4015 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
4016 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
4017 #endif
4018 // Special LP64 flags, product only needed for now.
4019 #ifdef _LP64
4020 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
4021 #else
4022 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
4023 #endif // _LP64
4024 
4025 // Implementation macros
4026 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
4027 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
4028 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
4029 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
4030 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
4031 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
4032 #ifdef PRODUCT
4033 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
4034 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
4035 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
4036 #else
4037 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
4038 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
4039 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
4040 #endif
4041 #ifdef _LP64
4042 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
4043 #else
4044 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
4045 #endif // _LP64
4046 
4047 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)
4048 
4049 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
4050 
4051 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
4052 
4053 // Extensions
4054 
4055 #include "runtime/globals_ext.hpp"
4056 
4057 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---