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