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_bsd
  65 # include "globals_bsd.hpp"
  66 #endif
  67 #ifdef TARGET_OS_ARCH_linux_x86
  68 # include "globals_linux_x86.hpp"
  69 #endif
  70 #ifdef TARGET_OS_ARCH_linux_sparc
  71 # include "globals_linux_sparc.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_zero
  74 # include "globals_linux_zero.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_solaris_x86
  77 # include "globals_solaris_x86.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_solaris_sparc
  80 # include "globals_solaris_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_windows_x86
  83 # include "globals_windows_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_linux_arm
  86 # include "globals_linux_arm.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_linux_ppc
  89 # include "globals_linux_ppc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_bsd_x86
  92 # include "globals_bsd_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_bsd_zero
  95 # include "globals_bsd_zero.hpp"
  96 #endif
  97 #ifdef COMPILER1
  98 #ifdef TARGET_ARCH_x86
  99 # include "c1_globals_x86.hpp"
 100 #endif
 101 #ifdef TARGET_ARCH_sparc
 102 # include "c1_globals_sparc.hpp"
 103 #endif
 104 #ifdef TARGET_ARCH_arm
 105 # include "c1_globals_arm.hpp"
 106 #endif
 107 #ifdef TARGET_ARCH_ppc
 108 # include "c1_globals_ppc.hpp"
 109 #endif
 110 #ifdef TARGET_OS_FAMILY_linux
 111 # include "c1_globals_linux.hpp"
 112 #endif
 113 #ifdef TARGET_OS_FAMILY_solaris
 114 # include "c1_globals_solaris.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_windows
 117 # include "c1_globals_windows.hpp"
 118 #endif
 119 #ifdef TARGET_OS_FAMILY_bsd
 120 # include "c1_globals_bsd.hpp"
 121 #endif
 122 #endif
 123 #ifdef COMPILER2
 124 #ifdef TARGET_ARCH_x86
 125 # include "c2_globals_x86.hpp"
 126 #endif
 127 #ifdef TARGET_ARCH_sparc
 128 # include "c2_globals_sparc.hpp"
 129 #endif
 130 #ifdef TARGET_ARCH_arm
 131 # include "c2_globals_arm.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_linux
 134 # include "c2_globals_linux.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_solaris
 137 # include "c2_globals_solaris.hpp"
 138 #endif
 139 #ifdef TARGET_OS_FAMILY_windows
 140 # include "c2_globals_windows.hpp"
 141 #endif
 142 #ifdef TARGET_OS_FAMILY_bsd
 143 # include "c2_globals_bsd.hpp"
 144 #endif
 145 #endif
 146 #ifdef SHARK
 147 #ifdef TARGET_ARCH_zero
 148 # include "shark_globals_zero.hpp"
 149 #endif
 150 #endif
 151 
 152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 153 define_pd_global(bool, BackgroundCompilation,        false);
 154 define_pd_global(bool, UseTLAB,                      false);
 155 define_pd_global(bool, CICompileOSR,                 false);
 156 define_pd_global(bool, UseTypeProfile,               false);
 157 define_pd_global(bool, UseOnStackReplacement,        false);
 158 define_pd_global(bool, InlineIntrinsics,             false);
 159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 160 define_pd_global(bool, ProfileInterpreter,           false);
 161 define_pd_global(bool, ProfileTraps,                 false);
 162 define_pd_global(bool, TieredCompilation,            false);
 163 
 164 define_pd_global(intx, CompileThreshold,             0);
 165 define_pd_global(intx, BackEdgeThreshold,            0);
 166 
 167 define_pd_global(intx, OnStackReplacePercentage,     0);
 168 define_pd_global(bool, ResizeTLAB,                   false);
 169 define_pd_global(intx, FreqInlineSize,               0);
 170 define_pd_global(intx, InlineSmallCode,              0);
 171 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 172 define_pd_global(intx, InlineClassNatives,           true);
 173 define_pd_global(intx, InlineUnsafeOps,              true);
 174 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 175 define_pd_global(intx, ReservedCodeCacheSize,        32*M);


 176 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 177 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 178 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 179 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 180 define_pd_global(bool, NeverActAsServerClassMachine, true);
 181 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 182 #define CI_COMPILER_COUNT 0
 183 #else
 184 
 185 #ifdef COMPILER2
 186 #define CI_COMPILER_COUNT 2
 187 #else
 188 #define CI_COMPILER_COUNT 1
 189 #endif // COMPILER2
 190 
 191 #endif // no compilers
 192 
 193 // string type aliases used only in this file
 194 typedef const char* ccstr;
 195 typedef const char* ccstrlist;   // represents string arguments which accumulate
 196 
 197 struct Flag {
 198   enum Flags {
 199     // value origin
 200     DEFAULT          = 0,
 201     COMMAND_LINE     = 1,
 202     ENVIRON_VAR      = 2,
 203     CONFIG_FILE      = 3,
 204     MANAGEMENT       = 4,
 205     ERGONOMIC        = 5,
 206     ATTACH_ON_DEMAND = 6,
 207     INTERNAL         = 7,
 208 
 209     LAST_VALUE_ORIGIN = INTERNAL,
 210     VALUE_ORIGIN_BITS = 4,
 211     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 212 
 213     // flag kind
 214     KIND_PRODUCT            = 1 << 4,
 215     KIND_MANAGEABLE         = 1 << 5,
 216     KIND_DIAGNOSTIC         = 1 << 6,
 217     KIND_EXPERIMENTAL       = 1 << 7,
 218     KIND_NOT_PRODUCT        = 1 << 8,
 219     KIND_DEVELOP            = 1 << 9,
 220     KIND_PLATFORM_DEPENDENT = 1 << 10,
 221     KIND_READ_WRITE         = 1 << 11,
 222     KIND_C1                 = 1 << 12,
 223     KIND_C2                 = 1 << 13,
 224     KIND_ARCH               = 1 << 14,
 225     KIND_SHARK              = 1 << 15,
 226     KIND_LP64_PRODUCT       = 1 << 16,
 227     KIND_COMMERCIAL         = 1 << 17,
 228 
 229     KIND_MASK = ~VALUE_ORIGIN_MASK
 230   };
 231 
 232   const char* _type;
 233   const char* _name;
 234   void* _addr;
 235   NOT_PRODUCT(const char* _doc;)
 236   Flags _flags;
 237 
 238   // points to all Flags static array
 239   static Flag* flags;
 240 
 241   // number of flags
 242   static size_t numFlags;
 243 
 244   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
 245   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 246 
 247   void check_writable();
 248 
 249   bool is_bool() const;
 250   bool get_bool() const;
 251   void set_bool(bool value);
 252 
 253   bool is_intx() const;
 254   intx get_intx() const;
 255   void set_intx(intx value);
 256 
 257   bool is_uintx() const;
 258   uintx get_uintx() const;
 259   void set_uintx(uintx value);
 260 
 261   bool is_uint64_t() const;
 262   uint64_t get_uint64_t() const;
 263   void set_uint64_t(uint64_t value);
 264 
 265   bool is_double() const;
 266   double get_double() const;
 267   void set_double(double value);
 268 
 269   bool is_ccstr() const;
 270   bool ccstr_accumulates() const;
 271   ccstr get_ccstr() const;
 272   void set_ccstr(ccstr value);
 273 
 274   Flags get_origin();
 275   void set_origin(Flags origin);
 276 
 277   bool is_default();
 278   bool is_ergonomic();
 279   bool is_command_line();
 280 
 281   bool is_product() const;
 282   bool is_manageable() const;
 283   bool is_diagnostic() const;
 284   bool is_experimental() const;
 285   bool is_notproduct() const;
 286   bool is_develop() const;
 287   bool is_read_write() const;
 288   bool is_commercial() const;
 289 
 290   bool is_constant_in_binary() const;
 291 
 292   bool is_unlocker() const;
 293   bool is_unlocked() const;
 294   bool is_writeable() const;
 295   bool is_external() const;
 296 
 297   bool is_unlocker_ext() const;
 298   bool is_unlocked_ext() const;
 299   bool is_writeable_ext() const;
 300   bool is_external_ext() const;
 301 
 302   void get_locked_message(char*, int) const;
 303   void get_locked_message_ext(char*, int) const;
 304 
 305   void print_on(outputStream* st, bool withComments = false );
 306   void print_kind(outputStream* st);
 307   void print_as_flag(outputStream* st);
 308 };
 309 
 310 // debug flags control various aspects of the VM and are global accessible
 311 
 312 // use FlagSetting to temporarily change some debug flag
 313 // e.g. FlagSetting fs(DebugThisAndThat, true);
 314 // restored to previous value upon leaving scope
 315 class FlagSetting {
 316   bool val;
 317   bool* flag;
 318  public:
 319   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 320   ~FlagSetting()                       { *flag = val; }
 321 };
 322 
 323 
 324 class CounterSetting {
 325   intx* counter;
 326  public:
 327   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 328   ~CounterSetting()         { (*counter)--; }
 329 };
 330 
 331 
 332 class UIntFlagSetting {
 333   uintx val;
 334   uintx* flag;
 335  public:
 336   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 337   ~UIntFlagSetting()                         { *flag = val; }
 338 };
 339 
 340 
 341 class DoubleFlagSetting {
 342   double val;
 343   double* flag;
 344  public:
 345   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 346   ~DoubleFlagSetting()                           { *flag = val; }
 347 };
 348 
 349 
 350 class CommandLineFlags {
 351  public:
 352   static bool boolAt(char* name, size_t len, bool* value);
 353   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 354   static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
 355   static bool boolAtPut(char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 356 
 357   static bool intxAt(char* name, size_t len, intx* value);
 358   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 359   static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
 360   static bool intxAtPut(char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 361 
 362   static bool uintxAt(char* name, size_t len, uintx* value);
 363   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 364   static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
 365   static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 366 
 367   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 368   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 369   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
 370   static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 371 
 372   static bool doubleAt(char* name, size_t len, double* value);
 373   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 374   static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
 375   static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 376 
 377   static bool ccstrAt(char* name, size_t len, ccstr* value);
 378   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 379   static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
 380   static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 381 
 382   // Returns false if name is not a command line flag.
 383   static bool wasSetOnCmdline(const char* name, bool* value);
 384   static void printSetFlags(outputStream* out);
 385 
 386   static void printFlags(outputStream* out, bool withComments);
 387 
 388   static void verify() PRODUCT_RETURN;
 389 };
 390 
 391 // use this for flags that are true by default in the debug version but
 392 // false in the optimized version, and vice versa
 393 #ifdef ASSERT
 394 #define trueInDebug  true
 395 #define falseInDebug false
 396 #else
 397 #define trueInDebug  false
 398 #define falseInDebug true
 399 #endif
 400 
 401 // use this for flags that are true per default in the product build
 402 // but false in development builds, and vice versa
 403 #ifdef PRODUCT
 404 #define trueInProduct  true
 405 #define falseInProduct false
 406 #else
 407 #define trueInProduct  false
 408 #define falseInProduct true
 409 #endif
 410 
 411 #ifdef JAVASE_EMBEDDED
 412 #define falseInEmbedded false
 413 #else
 414 #define falseInEmbedded true
 415 #endif
 416 
 417 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 418 // product flags are always settable / visible
 419 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 420 
 421 // A flag must be declared with one of the following types:
 422 // bool, intx, uintx, ccstr.
 423 // The type "ccstr" is an alias for "const char*" and is used
 424 // only in this file, because the macrology requires single-token type names.
 425 
 426 // Note: Diagnostic options not meant for VM tuning or for product modes.
 427 // They are to be used for VM quality assurance or field diagnosis
 428 // of VM bugs.  They are hidden so that users will not be encouraged to
 429 // try them as if they were VM ordinary execution options.  However, they
 430 // are available in the product version of the VM.  Under instruction
 431 // from support engineers, VM customers can turn them on to collect
 432 // diagnostic information about VM problems.  To use a VM diagnostic
 433 // option, you must first specify +UnlockDiagnosticVMOptions.
 434 // (This master switch also affects the behavior of -Xprintflags.)
 435 //
 436 // experimental flags are in support of features that are not
 437 //    part of the officially supported product, but are available
 438 //    for experimenting with. They could, for example, be performance
 439 //    features that may not have undergone full or rigorous QA, but which may
 440 //    help performance in some cases and released for experimentation
 441 //    by the community of users and developers. This flag also allows one to
 442 //    be able to build a fully supported product that nonetheless also
 443 //    ships with some unsupported, lightly tested, experimental features.
 444 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 445 //    UnlockExperimentalVMOptions flag, which allows the control and
 446 //    modification of the experimental flags.
 447 //
 448 // Nota bene: neither diagnostic nor experimental options should be used casually,
 449 //    and they are not supported on production loads, except under explicit
 450 //    direction from support engineers.
 451 //
 452 // manageable flags are writeable external product flags.
 453 //    They are dynamically writeable through the JDK management interface
 454 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 455 //    These flags are external exported interface (see CCC).  The list of
 456 //    manageable flags can be queried programmatically through the management
 457 //    interface.
 458 //
 459 //    A flag can be made as "manageable" only if
 460 //    - the flag is defined in a CCC as an external exported interface.
 461 //    - the VM implementation supports dynamic setting of the flag.
 462 //      This implies that the VM must *always* query the flag variable
 463 //      and not reuse state related to the flag state at any given time.
 464 //    - you want the flag to be queried programmatically by the customers.
 465 //
 466 // product_rw flags are writeable internal product flags.
 467 //    They are like "manageable" flags but for internal/private use.
 468 //    The list of product_rw flags are internal/private flags which
 469 //    may be changed/removed in a future release.  It can be set
 470 //    through the management interface to get/set value
 471 //    when the name of flag is supplied.
 472 //
 473 //    A flag can be made as "product_rw" only if
 474 //    - the VM implementation supports dynamic setting of the flag.
 475 //      This implies that the VM must *always* query the flag variable
 476 //      and not reuse state related to the flag state at any given time.
 477 //
 478 // Note that when there is a need to support develop flags to be writeable,
 479 // it can be done in the same way as product_rw.
 480 
 481 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 482                                                                             \
 483   lp64_product(bool, UseCompressedOops, false,                              \
 484             "Use 32-bit object references in 64-bit VM  "                   \
 485             "lp64_product means flag is always constant in 32 bit VM")      \
 486                                                                             \
 487   lp64_product(bool, UseCompressedClassPointers, false,                     \
 488             "Use 32-bit class pointers in 64-bit VM  "                      \
 489             "lp64_product means flag is always constant in 32 bit VM")      \
 490                                                                             \
 491   notproduct(bool, CheckCompressedOops, true,                               \
 492             "generate checks in encoding/decoding code in debug VM")        \
 493                                                                             \
 494   product_pd(uintx, HeapBaseMinAddress,                                     \
 495             "OS specific low limit for heap base address")                  \
 496                                                                             \
 497   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 498             "Print compressed oops base address and encoding mode")         \
 499                                                                             \
 500   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 501           "Default object alignment in bytes, 8 is minimum")                \
 502                                                                             \
 503   product(bool, AssumeMP, false,                                            \
 504           "Instruct the VM to assume multiple processors are available")    \
 505                                                                             \
 506   /* UseMembar is theoretically a temp flag used for memory barrier         \
 507    * removal testing.  It was supposed to be removed before FCS but has     \
 508    * been re-added (see 6401008) */                                         \
 509   product_pd(bool, UseMembar,                                               \
 510           "(Unstable) Issues membars on thread state transitions")          \
 511                                                                             \
 512   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 513    * that don't support it.  This will be replaced by processor detection   \
 514    * logic.                                                                 \
 515    */                                                                       \
 516   product(bool, UsePPCLWSYNC, true,                                         \
 517           "Use lwsync instruction if true, else use slower sync")           \
 518                                                                             \
 519   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 520           "Whether to clean the chunk pool asynchronously")                 \
 521                                                                             \
 522   /* Temporary: See 6948537 */                                              \
 523   experimental(bool, UseMemSetInBOT, true,                                  \
 524           "(Unstable) uses memset in BOT updates in GC code")               \
 525                                                                             \
 526   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 527           "Enable normal processing of flags relating to field diagnostics")\
 528                                                                             \
 529   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 530           "Enable normal processing of flags relating to experimental features")\
 531                                                                             \
 532   product(bool, JavaMonitorsInStackTrace, true,                             \
 533           "Print info. about Java monitor locks when the stacks are dumped")\
 534                                                                             \
 535   product_pd(bool, UseLargePages,                                           \
 536           "Use large page memory")                                          \
 537                                                                             \
 538   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 539           "Allocate large pages individually for better affinity")          \
 540                                                                             \
 541   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 542           "Fail large pages individual allocation")                         \
 543                                                                             \
 544   develop(bool, TracePageSizes, false,                                      \
 545           "Trace page size selection and usage.")                           \
 546                                                                             \
 547   product(bool, UseNUMA, false,                                             \
 548           "Use NUMA if available")                                          \
 549                                                                             \
 550   product(bool, UseNUMAInterleaving, false,                                 \
 551           "Interleave memory across NUMA nodes if available")               \
 552                                                                             \
 553   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 554           "Granularity to use for NUMA interleaving on Windows OS")         \
 555                                                                             \
 556   product(bool, ForceNUMA, false,                                           \
 557           "Force NUMA optimizations on single-node/UMA systems")            \
 558                                                                             \
 559   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 560           "Percentage (0-100) used to weigh the current sample when "      \
 561           "computing exponentially decaying average for "                   \
 562           "AdaptiveNUMAChunkSizing")                                        \
 563                                                                             \
 564   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 565           "Do not reallocate more that this amount per collection")         \
 566                                                                             \
 567   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 568           "Enable adaptive chunk sizing for NUMA")                          \
 569                                                                             \
 570   product(bool, NUMAStats, false,                                           \
 571           "Print NUMA stats in detailed heap information")                  \
 572                                                                             \
 573   product(uintx, NUMAPageScanRate, 256,                                     \
 574           "Maximum number of pages to include in the page scan procedure")  \
 575                                                                             \
 576   product_pd(bool, NeedsDeoptSuspend,                                       \
 577           "True for register window machines (sparc/ia64)")                 \
 578                                                                             \
 579   product(intx, UseSSE, 99,                                                 \
 580           "Highest supported SSE instructions set on x86/x64")              \
 581                                                                             \
 582   product(bool, UseAES, false,                                               \
 583           "Control whether AES instructions can be used on x86/x64")        \
 584                                                                             \
 585   product(uintx, LargePageSizeInBytes, 0,                                   \
 586           "Large page size (0 to let VM choose the page size")              \
 587                                                                             \
 588   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 589           "Use large pages if max heap is at least this big")               \
 590                                                                             \
 591   product(bool, ForceTimeHighResolution, false,                             \
 592           "Using high time resolution(For Win32 only)")                     \
 593                                                                             \
 594   develop(bool, TraceItables, false,                                        \
 595           "Trace initialization and use of itables")                        \
 596                                                                             \
 597   develop(bool, TracePcPatching, false,                                     \
 598           "Trace usage of frame::patch_pc")                                 \
 599                                                                             \
 600   develop(bool, TraceJumps, false,                                          \
 601           "Trace assembly jumps in thread ring buffer")                     \
 602                                                                             \
 603   develop(bool, TraceRelocator, false,                                      \
 604           "Trace the bytecode relocator")                                   \
 605                                                                             \
 606   develop(bool, TraceLongCompiles, false,                                   \
 607           "Print out every time compilation is longer than "                \
 608           "a given threashold")                                             \
 609                                                                             \
 610   develop(bool, SafepointALot, false,                                       \
 611           "Generates a lot of safepoints. Works with "                      \
 612           "GuaranteedSafepointInterval")                                    \
 613                                                                             \
 614   product_pd(bool, BackgroundCompilation,                                   \
 615           "A thread requesting compilation is not blocked during "          \
 616           "compilation")                                                    \
 617                                                                             \
 618   product(bool, PrintVMQWaitTime, false,                                    \
 619           "Prints out the waiting time in VM operation queue")              \
 620                                                                             \
 621   develop(bool, NoYieldsInMicrolock, false,                                 \
 622           "Disable yields in microlock")                                    \
 623                                                                             \
 624   develop(bool, TraceOopMapGeneration, false,                               \
 625           "Shows oopmap generation")                                        \
 626                                                                             \
 627   product(bool, MethodFlushing, true,                                       \
 628           "Reclamation of zombie and not-entrant methods")                  \
 629                                                                             \
 630   develop(bool, VerifyStack, false,                                         \
 631           "Verify stack of each thread when it is entering a runtime call") \
 632                                                                             \
 633   diagnostic(bool, ForceUnreachable, false,                                 \
 634           "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
 635                                                                             \
 636   notproduct(bool, StressDerivedPointers, false,                            \
 637           "Force scavenge when a derived pointers is detected on stack "    \
 638           "after rtm call")                                                 \
 639                                                                             \
 640   develop(bool, TraceDerivedPointers, false,                                \
 641           "Trace traversal of derived pointers on stack")                   \
 642                                                                             \
 643   notproduct(bool, TraceCodeBlobStacks, false,                              \
 644           "Trace stack-walk of codeblobs")                                  \
 645                                                                             \
 646   product(bool, PrintJNIResolving, false,                                   \
 647           "Used to implement -v:jni")                                       \
 648                                                                             \
 649   notproduct(bool, PrintRewrites, false,                                    \
 650           "Print methods that are being rewritten")                         \
 651                                                                             \
 652   product(bool, UseInlineCaches, true,                                      \
 653           "Use Inline Caches for virtual calls ")                           \
 654                                                                             \
 655   develop(bool, InlineArrayCopy, true,                                      \
 656           "inline arraycopy native that is known to be part of "            \
 657           "base library DLL")                                               \
 658                                                                             \
 659   develop(bool, InlineObjectHash, true,                                     \
 660           "inline Object::hashCode() native that is known to be part "      \
 661           "of base library DLL")                                            \
 662                                                                             \
 663   develop(bool, InlineNatives, true,                                        \
 664           "inline natives that are known to be part of base library DLL")   \
 665                                                                             \
 666   develop(bool, InlineMathNatives, true,                                    \
 667           "inline SinD, CosD, etc.")                                        \
 668                                                                             \
 669   develop(bool, InlineClassNatives, true,                                   \
 670           "inline Class.isInstance, etc")                                   \
 671                                                                             \
 672   develop(bool, InlineThreadNatives, true,                                  \
 673           "inline Thread.currentThread, etc")                               \
 674                                                                             \
 675   develop(bool, InlineUnsafeOps, true,                                      \
 676           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 677                                                                             \
 678   product(bool, CriticalJNINatives, true,                                   \
 679           "check for critical JNI entry points")                            \
 680                                                                             \
 681   notproduct(bool, StressCriticalJNINatives, false,                         \
 682             "Exercise register saving code in critical natives")            \
 683                                                                             \
 684   product(bool, UseSSE42Intrinsics, false,                                  \
 685           "SSE4.2 versions of intrinsics")                                  \
 686                                                                             \
 687   product(bool, UseAESIntrinsics, false,                                    \
 688           "use intrinsics for AES versions of crypto")                      \
 689                                                                             \
 690   product(bool, UseCRC32Intrinsics, false,                                  \
 691           "use intrinsics for java.util.zip.CRC32")                         \
 692                                                                             \
 693   develop(bool, TraceCallFixup, false,                                      \
 694           "traces all call fixups")                                         \
 695                                                                             \
 696   develop(bool, DeoptimizeALot, false,                                      \
 697           "deoptimize at every exit from the runtime system")               \
 698                                                                             \
 699   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 700           "a comma separated list of bcis to deoptimize at")                \
 701                                                                             \
 702   product(bool, DeoptimizeRandom, false,                                    \
 703           "deoptimize random frames on random exit from the runtime system")\
 704                                                                             \
 705   notproduct(bool, ZombieALot, false,                                       \
 706           "creates zombies (non-entrant) at exit from the runt. system")    \
 707                                                                             \
 708   product(bool, UnlinkSymbolsALot, false,                                   \
 709           "unlink unreferenced symbols from the symbol table at safepoints")\
 710                                                                             \
 711   notproduct(bool, WalkStackALot, false,                                    \
 712           "trace stack (no print) at every exit from the runtime system")   \
 713                                                                             \
 714   product(bool, Debugging, false,                                           \
 715           "set when executing debug methods in debug.ccp "                  \
 716           "(to prevent triggering assertions)")                             \
 717                                                                             \
 718   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 719           "Enable strict checks that safepoints cannot happen for threads " \
 720           "that used No_Safepoint_Verifier")                                \
 721                                                                             \
 722   notproduct(bool, VerifyLastFrame, false,                                  \
 723           "Verify oops on last frame on entry to VM")                       \
 724                                                                             \
 725   develop(bool, TraceHandleAllocation, false,                               \
 726           "Prints out warnings when suspicious many handles are allocated") \
 727                                                                             \
 728   product(bool, UseCompilerSafepoints, true,                                \
 729           "Stop at safepoints in compiled code")                            \
 730                                                                             \
 731   product(bool, FailOverToOldVerifier, true,                                \
 732           "fail over to old verifier when split verifier fails")            \
 733                                                                             \
 734   develop(bool, ShowSafepointMsgs, false,                                   \
 735           "Show msg. about safepoint synch.")                               \
 736                                                                             \
 737   product(bool, SafepointTimeout, false,                                    \
 738           "Time out and warn or fail after SafepointTimeoutDelay "          \
 739           "milliseconds if failed to reach safepoint")                      \
 740                                                                             \
 741   develop(bool, DieOnSafepointTimeout, false,                               \
 742           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 743                                                                             \
 744   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 745   /* typically, at most a few retries are needed */                         \
 746   product(intx, SuspendRetryCount, 50,                                      \
 747           "Maximum retry count for an external suspend request")            \
 748                                                                             \
 749   product(intx, SuspendRetryDelay, 5,                                       \
 750           "Milliseconds to delay per retry (* current_retry_count)")        \
 751                                                                             \
 752   product(bool, AssertOnSuspendWaitFailure, false,                          \
 753           "Assert/Guarantee on external suspend wait failure")              \
 754                                                                             \
 755   product(bool, TraceSuspendWaitFailures, false,                            \
 756           "Trace external suspend wait failures")                           \
 757                                                                             \
 758   product(bool, MaxFDLimit, true,                                           \
 759           "Bump the number of file descriptors to max in solaris.")         \
 760                                                                             \
 761   diagnostic(bool, LogEvents, true,                                         \
 762              "Enable the various ring buffer event logs")                   \
 763                                                                             \
 764   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 765              "Enable the various ring buffer event logs")                   \
 766                                                                             \
 767   product(bool, BytecodeVerificationRemote, true,                           \
 768           "Enables the Java bytecode verifier for remote classes")          \
 769                                                                             \
 770   product(bool, BytecodeVerificationLocal, false,                           \
 771           "Enables the Java bytecode verifier for local classes")           \
 772                                                                             \
 773   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 774           "Force exceptions on FP stack under/overflow")                    \
 775                                                                             \
 776   develop(bool, VerifyStackAtCalls, false,                                  \
 777           "Verify that the stack pointer is unchanged after calls")         \
 778                                                                             \
 779   develop(bool, TraceJavaAssertions, false,                                 \
 780           "Trace java language assertions")                                 \
 781                                                                             \
 782   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 783           "temporary - see javaClasses.cpp")                                \
 784                                                                             \
 785   notproduct(bool, PrintMallocFree, false,                                  \
 786           "Trace calls to C heap malloc/free allocation")                   \
 787                                                                             \
 788   product(bool, PrintOopAddress, false,                                     \
 789           "Always print the location of the oop")                           \
 790                                                                             \
 791   notproduct(bool, VerifyCodeCacheOften, false,                             \
 792           "Verify compiled-code cache often")                               \
 793                                                                             \
 794   develop(bool, ZapDeadCompiledLocals, false,                               \
 795           "Zap dead locals in compiler frames")                             \
 796                                                                             \
 797   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 798           "Zap dead locals (old version, zaps all frames when "             \
 799           "entering the VM")                                                \
 800                                                                             \
 801   notproduct(bool, CheckOopishValues, false,                                \
 802           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 803                                                                             \
 804   develop(bool, UseMallocOnly, false,                                       \
 805           "use only malloc/free for allocation (no resource area/arena)")   \
 806                                                                             \
 807   develop(bool, PrintMalloc, false,                                         \
 808           "print all malloc/free calls")                                    \
 809                                                                             \
 810   develop(bool, PrintMallocStatistics, false,                               \
 811           "print malloc/free statistics")                                   \
 812                                                                             \
 813   develop(bool, ZapResourceArea, trueInDebug,                               \
 814           "Zap freed resource/arena space with 0xABABABAB")                 \
 815                                                                             \
 816   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 817           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 818                                                                             \
 819   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 820           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 821                                                                             \
 822   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 823              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 824                                                                             \
 825   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 826           "Zap unused heap space with 0xBAADBABE")                          \
 827                                                                             \
 828   develop(bool, TraceZapUnusedHeapArea, false,                              \
 829           "Trace zapping of unused heap space")                             \
 830                                                                             \
 831   develop(bool, CheckZapUnusedHeapArea, false,                              \
 832           "Check zapping of unused heap space")                             \
 833                                                                             \
 834   develop(bool, ZapFillerObjects, trueInDebug,                              \
 835           "Zap filler objects with 0xDEAFBABE")                             \
 836                                                                             \
 837   develop(bool, PrintVMMessages, true,                                      \
 838           "Print vm messages on console")                                   \
 839                                                                             \
 840   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 841           "Print the time the application has been running")                \
 842                                                                             \
 843   product(bool, PrintGCApplicationStoppedTime, false,                       \
 844           "Print the time the application has been stopped")                \
 845                                                                             \
 846   diagnostic(bool, VerboseVerification, false,                              \
 847              "Display detailed verification details")                       \
 848                                                                             \
 849   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 850           "If > 0, provokes an error after VM initialization; the value"    \
 851           "determines which error to provoke.  See test_error_handler()"    \
 852           "in debug.cpp.")                                                  \
 853                                                                             \
 854   develop(bool, Verbose, false,                                             \
 855           "Prints additional debugging information from other modes")       \
 856                                                                             \
 857   develop(bool, PrintMiscellaneous, false,                                  \
 858           "Prints uncategorized debugging information (requires +Verbose)") \
 859                                                                             \
 860   develop(bool, WizardMode, false,                                          \
 861           "Prints much more debugging information")                         \
 862                                                                             \
 863   product(bool, ShowMessageBoxOnError, false,                               \
 864           "Keep process alive on VM fatal error")                           \
 865                                                                             \
 866   product(bool, CreateMinidumpOnCrash, false,                               \
 867           "Create minidump on VM fatal error")                              \
 868                                                                             \
 869   product_pd(bool, UseOSErrorReporting,                                     \
 870           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 871                                                                             \
 872   product(bool, SuppressFatalErrorMessage, false,                           \
 873           "Do NO Fatal Error report [Avoid deadlock]")                      \
 874                                                                             \
 875   product(ccstrlist, OnError, "",                                           \
 876           "Run user-defined commands on fatal error; see VMError.cpp "      \
 877           "for examples")                                                   \
 878                                                                             \
 879   product(ccstrlist, OnOutOfMemoryError, "",                                \
 880           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 881                                                                             \
 882   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 883           "Dump heap to file before any major stop-world GC")               \
 884                                                                             \
 885   manageable(bool, HeapDumpAfterFullGC, false,                              \
 886           "Dump heap to file after any major stop-world GC")                \
 887                                                                             \
 888   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 889           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 890                                                                             \
 891   manageable(ccstr, HeapDumpPath, NULL,                                     \
 892           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 893           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 894           "in the working directory)")                                      \
 895                                                                             \
 896   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 897           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 898           "when the heap usage is larger than this")                        \
 899                                                                             \
 900   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 901           "Approximate segment size when generating a segmented heap dump") \
 902                                                                             \
 903   develop(bool, BreakAtWarning, false,                                      \
 904           "Execute breakpoint upon encountering VM warning")                \
 905                                                                             \
 906   develop(bool, TraceVMOperation, false,                                    \
 907           "Trace vm operations")                                            \
 908                                                                             \
 909   develop(bool, UseFakeTimers, false,                                       \
 910           "Tells whether the VM should use system time or a fake timer")    \
 911                                                                             \
 912   product(ccstr, NativeMemoryTracking, "off",                               \
 913           "Native memory tracking options")                                 \
 914                                                                             \
 915   diagnostic(bool, PrintNMTStatistics, false,                               \
 916           "Print native memory tracking summary data if it is on")          \
 917                                                                             \
 918   diagnostic(bool, AutoShutdownNMT, true,                                   \
 919           "Automatically shutdown native memory tracking under stress "     \
 920           "situation. When set to false, native memory tracking tries to "  \
 921           "stay alive at the expense of JVM performance")                   \
 922                                                                             \
 923   diagnostic(bool, LogCompilation, false,                                   \
 924           "Log compilation activity in detail to LogFile")                  \
 925                                                                             \
 926   product(bool, PrintCompilation, false,                                    \
 927           "Print compilations")                                             \
 928                                                                             \
 929   diagnostic(bool, TraceNMethodInstalls, false,                             \
 930              "Trace nmethod intallation")                                   \
 931                                                                             \
 932   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 933              "0: do not allow scavengable oops in the code cache; "         \
 934              "1: allow scavenging from the code cache; "                    \
 935              "2: emit as many constants as the compiler can see")           \
 936                                                                             \
 937   product(bool, AlwaysRestoreFPU, false,                                    \
 938           "Restore the FPU control word after every JNI call (expensive)")  \
 939                                                                             \
 940   diagnostic(bool, PrintCompilation2, false,                                \
 941           "Print additional statistics per compilation")                    \
 942                                                                             \
 943   diagnostic(bool, PrintAdapterHandlers, false,                             \
 944           "Print code generated for i2c/c2i adapters")                      \
 945                                                                             \
 946   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 947           "Verify that i2c/c2i adapters are called properly")               \
 948                                                                             \
 949   develop(bool, VerifyAdapterSharing, false,                                \
 950           "Verify that the code for shared adapters is the equivalent")     \
 951                                                                             \
 952   diagnostic(bool, PrintAssembly, false,                                    \
 953           "Print assembly code (using external disassembler.so)")           \
 954                                                                             \
 955   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 956           "Options string passed to disassembler.so")                       \
 957                                                                             \
 958   diagnostic(bool, PrintNMethods, false,                                    \
 959           "Print assembly code for nmethods when generated")                \
 960                                                                             \
 961   diagnostic(bool, PrintNativeNMethods, false,                              \
 962           "Print assembly code for native nmethods when generated")         \
 963                                                                             \
 964   develop(bool, PrintDebugInfo, false,                                      \
 965           "Print debug information for all nmethods when generated")        \
 966                                                                             \
 967   develop(bool, PrintRelocations, false,                                    \
 968           "Print relocation information for all nmethods when generated")   \
 969                                                                             \
 970   develop(bool, PrintDependencies, false,                                   \
 971           "Print dependency information for all nmethods when generated")   \
 972                                                                             \
 973   develop(bool, PrintExceptionHandlers, false,                              \
 974           "Print exception handler tables for all nmethods when generated") \
 975                                                                             \
 976   develop(bool, StressCompiledExceptionHandlers, false,                     \
 977          "Exercise compiled exception handlers")                            \
 978                                                                             \
 979   develop(bool, InterceptOSException, false,                                \
 980           "Starts debugger when an implicit OS (e.g., NULL) "               \
 981           "exception happens")                                              \
 982                                                                             \
 983   product(bool, PrintCodeCache, false,                                      \
 984           "Print the code cache memory usage when exiting")                 \
 985                                                                             \
 986   develop(bool, PrintCodeCache2, false,                                     \
 987           "Print detailed usage info on the code cache when exiting")       \
 988                                                                             \
 989   product(bool, PrintCodeCacheOnCompilation, false,                         \
 990           "Print the code cache memory usage each time a method is compiled") \
 991                                                                             \
 992   diagnostic(bool, PrintStubCode, false,                                    \
 993           "Print generated stub code")                                      \
 994                                                                             \
 995   product(bool, StackTraceInThrowable, true,                                \
 996           "Collect backtrace in throwable when exception happens")          \
 997                                                                             \
 998   product(bool, OmitStackTraceInFastThrow, true,                            \
 999           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1000                                                                             \
1001   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1002           "Prints byte code statictics when dumping profiler output")       \
1003                                                                             \
1004   product(bool, ProfilerRecordPC, false,                                    \
1005           "Collects tick for each 16 byte interval of compiled code")       \
1006                                                                             \
1007   product(bool, ProfileVM, false,                                           \
1008           "Profiles ticks that fall within VM (either in the VM Thread "    \
1009           "or VM code called through stubs)")                               \
1010                                                                             \
1011   product(bool, ProfileIntervals, false,                                    \
1012           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
1013                                                                             \
1014   notproduct(bool, ProfilerCheckIntervals, false,                           \
1015           "Collect and print info on spacing of profiler ticks")            \
1016                                                                             \
1017   develop(bool, PrintJVMWarnings, false,                                    \
1018           "Prints warnings for unimplemented JVM functions")                \
1019                                                                             \
1020   product(bool, PrintWarnings, true,                                        \
1021           "Prints JVM warnings to output stream")                           \
1022                                                                             \
1023   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1024           "Prints warnings for stalled SpinLocks")                          \
1025                                                                             \
1026   product(bool, RegisterFinalizersAtInit, true,                             \
1027           "Register finalizable objects at end of Object.<init> or "        \
1028           "after allocation")                                               \
1029                                                                             \
1030   develop(bool, RegisterReferences, true,                                   \
1031           "Tells whether the VM should register soft/weak/final/phantom "   \
1032           "references")                                                     \
1033                                                                             \
1034   develop(bool, IgnoreRewrites, false,                                      \
1035           "Supress rewrites of bytecodes in the oopmap generator. "         \
1036           "This is unsafe!")                                                \
1037                                                                             \
1038   develop(bool, PrintCodeCacheExtension, false,                             \
1039           "Print extension of code cache")                                  \
1040                                                                             \
1041   develop(bool, UsePrivilegedStack, true,                                   \
1042           "Enable the security JVM functions")                              \
1043                                                                             \
1044   develop(bool, ProtectionDomainVerification, true,                         \
1045           "Verifies protection domain before resolution in system "         \
1046           "dictionary")                                                     \
1047                                                                             \
1048   product(bool, ClassUnloading, true,                                       \
1049           "Do unloading of classes")                                        \
1050                                                                             \
1051   develop(bool, DisableStartThread, false,                                  \
1052           "Disable starting of additional Java threads "                    \
1053           "(for debugging only)")                                           \
1054                                                                             \
1055   develop(bool, MemProfiling, false,                                        \
1056           "Write memory usage profiling to log file")                       \
1057                                                                             \
1058   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1059           "Prints the system dictionary at exit")                           \
1060                                                                             \
1061   experimental(intx, PredictedLoadedClassCount, 0,                          \
1062           "Experimental: Tune loaded class cache starting size.")           \
1063                                                                             \
1064   diagnostic(bool, UnsyncloadClass, false,                                  \
1065           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1066           "class loader  must call VM synchronized for findClass "          \
1067           "and defineClass.")                                               \
1068                                                                             \
1069   product(bool, AlwaysLockClassLoader, false,                               \
1070           "Require the VM to acquire the class loader lock before calling " \
1071           "loadClass() even for class loaders registering "                 \
1072           "as parallel capable")                                            \
1073                                                                             \
1074   product(bool, AllowParallelDefineClass, false,                            \
1075           "Allow parallel defineClass requests for class loaders "          \
1076           "registering as parallel capable")                                \
1077                                                                             \
1078   product(bool, MustCallLoadClassInternal, false,                           \
1079           "Call loadClassInternal() rather than loadClass()")               \
1080                                                                             \
1081   product_pd(bool, DontYieldALot,                                           \
1082           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1083                                                                             \
1084   product_pd(bool, ConvertSleepToYield,                                     \
1085           "Converts sleep(0) to thread yield "                              \
1086           "(may be off for SOLARIS to improve GUI)")                        \
1087                                                                             \
1088   product(bool, ConvertYieldToSleep, false,                                 \
1089           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1090           "behavior (SOLARIS only)")                                        \
1091                                                                             \
1092   product(bool, UseBoundThreads, true,                                      \
1093           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1094                                                                             \
1095   develop(bool, UseDetachedThreads, true,                                   \
1096           "Use detached threads that are recycled upon termination "        \
1097           "(for SOLARIS only)")                                             \
1098                                                                             \
1099   product(bool, UseLWPSynchronization, true,                                \
1100           "Use LWP-based instead of libthread-based synchronization "       \
1101           "(SPARC only)")                                                   \
1102                                                                             \
1103   product(ccstr, SyncKnobs, NULL,                                           \
1104           "(Unstable) Various monitor synchronization tunables")            \
1105                                                                             \
1106   product(intx, EmitSync, 0,                                                \
1107           "(Unsafe,Unstable) "                                              \
1108           " Controls emission of inline sync fast-path code")               \
1109                                                                             \
1110   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1111                                                                             \
1112   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1113                                                                             \
1114   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1115                                                                             \
1116   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1117                                                                             \
1118   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1119                                                                             \
1120   product(intx, hashCode, 5,                                                \
1121          "(Unstable) select hashCode generation algorithm" )                \
1122                                                                             \
1123   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1124          "(Unstable, Linux-specific)"                                       \
1125          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1126                                                                             \
1127   product(bool, FilterSpuriousWakeups, true,                                \
1128           "Prevent spurious or premature wakeups from object.wait "         \
1129           "(Solaris only)")                                                 \
1130                                                                             \
1131   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1132   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1133   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1134                                                                             \
1135   develop(bool, UsePthreads, false,                                         \
1136           "Use pthread-based instead of libthread-based synchronization "   \
1137           "(SPARC only)")                                                   \
1138                                                                             \
1139   product(bool, AdjustConcurrency, false,                                   \
1140           "call thr_setconcurrency at thread create time to avoid "         \
1141           "LWP starvation on MP systems (For Solaris Only)")                \
1142                                                                             \
1143   product(bool, ReduceSignalUsage, false,                                   \
1144           "Reduce the use of OS signals in Java and/or the VM")             \
1145                                                                             \
1146   develop_pd(bool, ShareVtableStubs,                                        \
1147           "Share vtable stubs (smaller code but worse branch prediction")   \
1148                                                                             \
1149   develop(bool, LoadLineNumberTables, true,                                 \
1150           "Tells whether the class file parser loads line number tables")   \
1151                                                                             \
1152   develop(bool, LoadLocalVariableTables, true,                              \
1153           "Tells whether the class file parser loads local variable tables")\
1154                                                                             \
1155   develop(bool, LoadLocalVariableTypeTables, true,                          \
1156           "Tells whether the class file parser loads local variable type tables")\
1157                                                                             \
1158   product(bool, AllowUserSignalHandlers, false,                             \
1159           "Do not complain if the application installs signal handlers "    \
1160           "(Solaris & Linux only)")                                         \
1161                                                                             \
1162   product(bool, UseSignalChaining, true,                                    \
1163           "Use signal-chaining to invoke signal handlers installed "        \
1164           "by the application (Solaris & Linux only)")                      \
1165                                                                             \
1166   product(bool, UseAltSigs, false,                                          \
1167           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1168           "internal signals (Solaris only)")                                \
1169                                                                             \
1170   product(bool, AllowJNIEnvProxy, false,                                    \
1171           "Allow JNIEnv proxies for jdbx")                                  \
1172                                                                             \
1173   product(bool, JNIDetachReleasesMonitors, true,                            \
1174           "JNI DetachCurrentThread releases monitors owned by thread")      \
1175                                                                             \
1176   product(bool, RestoreMXCSROnJNICalls, false,                              \
1177           "Restore MXCSR when returning from JNI calls")                    \
1178                                                                             \
1179   product(bool, CheckJNICalls, false,                                       \
1180           "Verify all arguments to JNI calls")                              \
1181                                                                             \
1182   product(bool, UseFastJNIAccessors, true,                                  \
1183           "Use optimized versions of Get<Primitive>Field")                  \
1184                                                                             \
1185   product(bool, EagerXrunInit, false,                                       \
1186           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1187           " but not all -Xrun libraries may support the state of the VM at this time") \
1188                                                                             \
1189   product(bool, PreserveAllAnnotations, false,                              \
1190           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1191                                                                             \
1192   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1193           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1194                                                                             \
1195   product(bool, LazyBootClassLoader, true,                                  \
1196           "Enable/disable lazy opening of boot class path entries")         \
1197                                                                             \
1198   product(bool, UseXMMForArrayCopy, false,                                  \
1199           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1200                                                                             \
1201   product(intx, FieldsAllocationStyle, 1,                                   \
1202           "0 - type based with oops first, 1 - with oops last, "            \
1203           "2 - oops in super and sub classes are together")                 \
1204                                                                             \
1205   product(bool, CompactFields, true,                                        \
1206           "Allocate nonstatic fields in gaps between previous fields")      \
1207                                                                             \
1208   notproduct(bool, PrintFieldLayout, false,                                 \
1209           "Print field layout for each class")                              \
1210                                                                             \
1211   product(intx, ContendedPaddingWidth, 128,                                 \
1212           "How many bytes to pad the fields/classes marked @Contended with")\
1213                                                                             \
1214   product(bool, EnableContended, true,                                      \
1215           "Enable @Contended annotation support")                           \
1216                                                                             \
1217   product(bool, RestrictContended, true,                                    \
1218           "Restrict @Contended to trusted classes")                         \
1219                                                                             \
1220   product(bool, UseBiasedLocking, true,                                     \
1221           "Enable biased locking in JVM")                                   \
1222                                                                             \
1223   product(intx, BiasedLockingStartupDelay, 4000,                            \
1224           "Number of milliseconds to wait before enabling biased locking")  \
1225                                                                             \
1226   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1227           "Print statistics of biased locking in JVM")                      \
1228                                                                             \
1229   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1230           "Threshold of number of revocations per type to try to "          \
1231           "rebias all objects in the heap of that type")                    \
1232                                                                             \
1233   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1234           "Threshold of number of revocations per type to permanently "     \
1235           "revoke biases of all objects in the heap of that type")          \
1236                                                                             \
1237   product(intx, BiasedLockingDecayTime, 25000,                              \
1238           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1239           "type after previous bulk rebias")                                \
1240                                                                             \
1241   /* tracing */                                                             \
1242                                                                             \
1243   notproduct(bool, TraceRuntimeCalls, false,                                \
1244           "Trace run-time calls")                                           \
1245                                                                             \
1246   develop(bool, TraceJNICalls, false,                                       \
1247           "Trace JNI calls")                                                \
1248                                                                             \
1249   notproduct(bool, TraceJVMCalls, false,                                    \
1250           "Trace JVM calls")                                                \
1251                                                                             \
1252   product(ccstr, TraceJVMTI, NULL,                                          \
1253           "Trace flags for JVMTI functions and events")                     \
1254                                                                             \
1255   /* This option can change an EMCP method into an obsolete method. */      \
1256   /* This can affect tests that except specific methods to be EMCP. */      \
1257   /* This option should be used with caution. */                            \
1258   product(bool, StressLdcRewrite, false,                                    \
1259           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1260                                                                             \
1261   product(intx, TraceRedefineClasses, 0,                                    \
1262           "Trace level for JVMTI RedefineClasses")                          \
1263                                                                             \
1264   develop(bool, StressMethodComparator, false,                              \
1265           "run the MethodComparator on all loaded methods")                 \
1266                                                                             \
1267   /* change to false by default sometime after Mustang */                   \
1268   product(bool, VerifyMergedCPBytecodes, true,                              \
1269           "Verify bytecodes after RedefineClasses constant pool merging")   \
1270                                                                             \
1271   develop(bool, TraceJNIHandleAllocation, false,                            \
1272           "Trace allocation/deallocation of JNI handle blocks")             \
1273                                                                             \
1274   develop(bool, TraceThreadEvents, false,                                   \
1275           "Trace all thread events")                                        \
1276                                                                             \
1277   develop(bool, TraceBytecodes, false,                                      \
1278           "Trace bytecode execution")                                       \
1279                                                                             \
1280   develop(bool, TraceClassInitialization, false,                            \
1281           "Trace class initialization")                                     \
1282                                                                             \
1283   develop(bool, TraceExceptions, false,                                     \
1284           "Trace exceptions")                                               \
1285                                                                             \
1286   develop(bool, TraceICs, false,                                            \
1287           "Trace inline cache changes")                                     \
1288                                                                             \
1289   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1290           "Trace method invocation counter overflow")                       \
1291                                                                             \
1292   develop(bool, TraceInlineCacheClearing, false,                            \
1293           "Trace clearing of inline caches in nmethods")                    \
1294                                                                             \
1295   develop(bool, TraceDependencies, false,                                   \
1296           "Trace dependencies")                                             \
1297                                                                             \
1298   develop(bool, VerifyDependencies, trueInDebug,                            \
1299          "Exercise and verify the compilation dependency mechanism")        \
1300                                                                             \
1301   develop(bool, TraceNewOopMapGeneration, false,                            \
1302           "Trace OopMapGeneration")                                         \
1303                                                                             \
1304   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1305           "Trace OopMapGeneration: print detailed cell states")             \
1306                                                                             \
1307   develop(bool, TimeOopMap, false,                                          \
1308           "Time calls to GenerateOopMap::compute_map() in sum")             \
1309                                                                             \
1310   develop(bool, TimeOopMap2, false,                                         \
1311           "Time calls to GenerateOopMap::compute_map() individually")       \
1312                                                                             \
1313   develop(bool, TraceMonitorMismatch, false,                                \
1314           "Trace monitor matching failures during OopMapGeneration")        \
1315                                                                             \
1316   develop(bool, TraceOopMapRewrites, false,                                 \
1317           "Trace rewritting of method oops during oop map generation")      \
1318                                                                             \
1319   develop(bool, TraceSafepoint, false,                                      \
1320           "Trace safepoint operations")                                     \
1321                                                                             \
1322   develop(bool, TraceICBuffer, false,                                       \
1323           "Trace usage of IC buffer")                                       \
1324                                                                             \
1325   develop(bool, TraceCompiledIC, false,                                     \
1326           "Trace changes of compiled IC")                                   \
1327                                                                             \
1328   notproduct(bool, TraceZapDeadLocals, false,                               \
1329           "Trace zapping dead locals")                                      \
1330                                                                             \
1331   develop(bool, TraceStartupTime, false,                                    \
1332           "Trace setup time")                                               \
1333                                                                             \
1334   develop(bool, TraceProtectionDomainVerification, false,                   \
1335           "Trace protection domain verifcation")                            \
1336                                                                             \
1337   develop(bool, TraceClearedExceptions, false,                              \
1338           "Prints when an exception is forcibly cleared")                   \
1339                                                                             \
1340   product(bool, TraceClassResolution, false,                                \
1341           "Trace all constant pool resolutions (for debugging)")            \
1342                                                                             \
1343   product(bool, TraceBiasedLocking, false,                                  \
1344           "Trace biased locking in JVM")                                    \
1345                                                                             \
1346   product(bool, TraceMonitorInflation, false,                               \
1347           "Trace monitor inflation in JVM")                                 \
1348                                                                             \
1349   /* gc */                                                                  \
1350                                                                             \
1351   product(bool, UseSerialGC, false,                                         \
1352           "Use the serial garbage collector")                               \
1353                                                                             \
1354   product(bool, UseG1GC, false,                                             \
1355           "Use the Garbage-First garbage collector")                        \
1356                                                                             \
1357   product(bool, UseParallelGC, false,                                       \
1358           "Use the Parallel Scavenge garbage collector")                    \
1359                                                                             \
1360   product(bool, UseParallelOldGC, false,                                    \
1361           "Use the Parallel Old garbage collector")                         \
1362                                                                             \
1363   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1364           "How often should we maximally compact the heap (not allowing "   \
1365           "any dead space)")                                                \
1366                                                                             \
1367   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1368           "The collection count for the first maximum compaction")          \
1369                                                                             \
1370   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1371           "In the Parallel Old garbage collector maximum compaction for "   \
1372           "a system GC")                                                    \
1373                                                                             \
1374   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1375           "The mean used by the par compact dead wood"                      \
1376           "limiter (a number between 0-100).")                              \
1377                                                                             \
1378   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1379           "The standard deviation used by the par compact dead wood"        \
1380           "limiter (a number between 0-100).")                              \
1381                                                                             \
1382   product(uintx, ParallelGCThreads, 0,                                      \
1383           "Number of parallel threads parallel gc will use")                \
1384                                                                             \
1385   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1386           "Dynamically choose the number of parallel threads "              \
1387           "parallel gc will use")                                           \
1388                                                                             \
1389   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1390           "Force dynamic selection of the number of"                        \
1391           "parallel threads parallel gc will use to aid debugging")         \
1392                                                                             \
1393   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1394           "Size of heap (bytes) per GC thread used in calculating the "     \
1395           "number of GC threads")                                           \
1396                                                                             \
1397   product(bool, TraceDynamicGCThreads, false,                               \
1398           "Trace the dynamic GC thread usage")                              \
1399                                                                             \
1400   develop(bool, ParallelOldGCSplitALot, false,                              \
1401           "Provoke splitting (copying data from a young gen space to"       \
1402           "multiple destination spaces)")                                   \
1403                                                                             \
1404   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1405           "How often to provoke splitting a young gen space")               \
1406                                                                             \
1407   product(uintx, ConcGCThreads, 0,                                          \
1408           "Number of threads concurrent gc will use")                       \
1409                                                                             \
1410   product(uintx, YoungPLABSize, 4096,                                       \
1411           "Size of young gen promotion labs (in HeapWords)")                \
1412                                                                             \
1413   product(uintx, OldPLABSize, 1024,                                         \
1414           "Size of old gen promotion labs (in HeapWords)")                  \
1415                                                                             \
1416   product(uintx, GCTaskTimeStampEntries, 200,                               \
1417           "Number of time stamp entries per gc worker thread")              \
1418                                                                             \
1419   product(bool, AlwaysTenure, false,                                        \
1420           "Always tenure objects in eden. (ParallelGC only)")               \
1421                                                                             \
1422   product(bool, NeverTenure, false,                                         \
1423           "Never tenure objects in eden, May tenure on overflow "           \
1424           "(ParallelGC only)")                                              \
1425                                                                             \
1426   product(bool, ScavengeBeforeFullGC, true,                                 \
1427           "Scavenge youngest generation before each full GC, "              \
1428           "used with UseParallelGC")                                        \
1429                                                                             \
1430   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1431           "Allow scavenges to occur when to_space contains objects.")       \
1432                                                                             \
1433   product(bool, UseConcMarkSweepGC, false,                                  \
1434           "Use Concurrent Mark-Sweep GC in the old generation")             \
1435                                                                             \
1436   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1437           "A System.gc() request invokes a concurrent collection;"          \
1438           " (effective only when UseConcMarkSweepGC)")                      \
1439                                                                             \
1440   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1441           "A System.gc() request invokes a concurrent collection and "      \
1442           "also unloads classes during such a concurrent gc cycle "         \
1443           "(effective only when UseConcMarkSweepGC)")                       \
1444                                                                             \
1445   product(bool, GCLockerInvokesConcurrent, false,                           \
1446           "The exit of a JNI CS necessitating a scavenge also"              \
1447           " kicks off a bkgrd concurrent collection")                       \
1448                                                                             \
1449   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1450           "How much the GC can expand the eden by while the GC locker  "    \
1451           "is active (as a percentage)")                                    \
1452                                                                             \
1453   diagnostic(intx, GCLockerRetryAllocationCount, 2,                         \
1454           "Number of times to retry allocations when"                       \
1455           " blocked by the GC locker")                                      \
1456                                                                             \
1457   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1458           "Use Adaptive Free Lists in the CMS generation")                  \
1459                                                                             \
1460   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1461           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1462                                                                             \
1463   develop(bool, RotateCMSCollectionTypes, false,                            \
1464           "Rotate the CMS collections among concurrent and STW")            \
1465                                                                             \
1466   product(bool, UseCMSBestFit, true,                                        \
1467           "Use CMS best fit allocation strategy")                           \
1468                                                                             \
1469   product(bool, UseCMSCollectionPassing, true,                              \
1470           "Use passing of collection from background to foreground")        \
1471                                                                             \
1472   product(bool, UseParNewGC, false,                                         \
1473           "Use parallel threads in the new generation.")                    \
1474                                                                             \
1475   product(bool, ParallelGCVerbose, false,                                   \
1476           "Verbose output for parallel GC.")                                \
1477                                                                             \
1478   product(uintx, ParallelGCBufferWastePct, 10,                              \
1479           "Wasted fraction of parallel allocation buffer.")                 \
1480                                                                             \
1481   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1482              "Retain parallel allocation buffers across scavenges; "        \
1483              " -- disabled because this currently conflicts with "          \
1484              " parallel card scanning under certain conditions ")           \
1485                                                                             \
1486   product(uintx, TargetPLABWastePct, 10,                                    \
1487           "Target wasted space in last buffer as percent of overall "       \
1488           "allocation")                                                     \
1489                                                                             \
1490   product(uintx, PLABWeight, 75,                                            \
1491           "Percentage (0-100) used to weight the current sample when"       \
1492           "computing exponentially decaying average for ResizePLAB.")       \
1493                                                                             \
1494   product(bool, ResizePLAB, true,                                           \
1495           "Dynamically resize (survivor space) promotion labs")             \
1496                                                                             \
1497   product(bool, PrintPLAB, false,                                           \
1498           "Print (survivor space) promotion labs sizing decisions")         \
1499                                                                             \
1500   product(intx, ParGCArrayScanChunk, 50,                                    \
1501           "Scan a subset and push remainder, if array is bigger than this") \
1502                                                                             \
1503   product(bool, ParGCUseLocalOverflow, false,                               \
1504           "Instead of a global overflow list, use local overflow stacks")   \
1505                                                                             \
1506   product(bool, ParGCTrimOverflow, true,                                    \
1507           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1508                                                                             \
1509   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1510           "Whether we should simulate work queue overflow in ParNew")       \
1511                                                                             \
1512   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1513           "An `interval' counter that determines how frequently "           \
1514           "we simulate overflow; a smaller number increases frequency")     \
1515                                                                             \
1516   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1517           "The desired number of objects to claim from the overflow list")  \
1518                                                                             \
1519   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1520           "The number of strides per worker thread that we divide up the "  \
1521           "card table scanning work into")                                  \
1522                                                                             \
1523   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1524           "The number of cards in each chunk of the parallel chunks used "  \
1525           "during card table scanning")                                     \
1526                                                                             \
1527   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1528           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1529           "parallel GC.")                                                   \
1530                                                                             \
1531   product(uintx, OldPLABWeight, 50,                                         \
1532           "Percentage (0-100) used to weight the current sample when"       \
1533           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1534                                                                             \
1535   product(bool, ResizeOldPLAB, true,                                        \
1536           "Dynamically resize (old gen) promotion labs")                    \
1537                                                                             \
1538   product(bool, PrintOldPLAB, false,                                        \
1539           "Print (old gen) promotion labs sizing decisions")                \
1540                                                                             \
1541   product(uintx, CMSOldPLABMin, 16,                                         \
1542           "Min size of CMS gen promotion lab caches per worker per blksize")\
1543                                                                             \
1544   product(uintx, CMSOldPLABMax, 1024,                                       \
1545           "Max size of CMS gen promotion lab caches per worker per blksize")\
1546                                                                             \
1547   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1548           "Nominal number of refills of CMS gen promotion lab cache"        \
1549           " per worker per block size")                                     \
1550                                                                             \
1551   product(bool, CMSOldPLABResizeQuicker, false,                             \
1552           "Whether to react on-the-fly during a scavenge to a sudden"       \
1553           " change in block demand rate")                                   \
1554                                                                             \
1555   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1556           "The tolerance of the phase-change detector for on-the-fly"       \
1557           " PLAB resizing during a scavenge")                               \
1558                                                                             \
1559   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1560           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1561           " during a scavenge")                                             \
1562                                                                             \
1563   product(bool, AlwaysPreTouch, false,                                      \
1564           "It forces all freshly committed pages to be pre-touched.")       \
1565                                                                             \
1566   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1567           "The maximum size of young gen chosen by default per GC worker "  \
1568           "thread available")                                               \
1569                                                                             \
1570   product(bool, CMSIncrementalMode, false,                                  \
1571           "Whether CMS GC should operate in \"incremental\" mode")          \
1572                                                                             \
1573   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1574           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1575           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1576           "value")                                                          \
1577                                                                             \
1578   product(bool, CMSIncrementalPacing, true,                                 \
1579           "Whether the CMS incremental mode duty cycle should be "          \
1580           "automatically adjusted")                                         \
1581                                                                             \
1582   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1583           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1584           "enabled (a percentage, 0-100)")                                  \
1585                                                                             \
1586   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1587           "Percentage (0-100) used to add conservatism when computing the " \
1588           "duty cycle")                                                     \
1589                                                                             \
1590   product(uintx, CMSIncrementalOffset, 0,                                   \
1591           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1592           " is shifted to the right within the period between young GCs")   \
1593                                                                             \
1594   product(uintx, CMSExpAvgFactor, 50,                                       \
1595           "Percentage (0-100) used to weight the current sample when"       \
1596           "computing exponential averages for CMS statistics.")             \
1597                                                                             \
1598   product(uintx, CMS_FLSWeight, 75,                                         \
1599           "Percentage (0-100) used to weight the current sample when"       \
1600           "computing exponentially decating averages for CMS FLS statistics.") \
1601                                                                             \
1602   product(uintx, CMS_FLSPadding, 1,                                         \
1603           "The multiple of deviation from mean to use for buffering"        \
1604           "against volatility in free list demand.")                        \
1605                                                                             \
1606   product(uintx, FLSCoalescePolicy, 2,                                      \
1607           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1608                                                                             \
1609   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1610           "CMS: Larger free blocks are always available for coalescing")    \
1611                                                                             \
1612   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1613           "CMS: the smaller the percentage the greater the coalition force")\
1614                                                                             \
1615   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1616           "CMS: the factor by which to inflate estimated demand of small"   \
1617           " block sizes to prevent coalescing with an adjoining block")     \
1618                                                                             \
1619   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1620           "CMS: the factor by which to inflate estimated demand of large"   \
1621           " block sizes to prevent coalescing with an adjoining block")     \
1622                                                                             \
1623   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1624           "CMS: the factor by which to inflate estimated demand of small"   \
1625           " block sizes to prevent splitting to supply demand for smaller"  \
1626           " blocks")                                                        \
1627                                                                             \
1628   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1629           "CMS: the factor by which to inflate estimated demand of large"   \
1630           " block sizes to prevent splitting to supply demand for smaller"  \
1631           " blocks")                                                        \
1632                                                                             \
1633   product(bool, CMSExtrapolateSweep, false,                                 \
1634           "CMS: cushion for block demand during sweep")                     \
1635                                                                             \
1636   product(uintx, CMS_SweepWeight, 75,                                       \
1637           "Percentage (0-100) used to weight the current sample when "      \
1638           "computing exponentially decaying average for inter-sweep "       \
1639           "duration")                                                       \
1640                                                                             \
1641   product(uintx, CMS_SweepPadding, 1,                                       \
1642           "The multiple of deviation from mean to use for buffering "       \
1643           "against volatility in inter-sweep duration.")                    \
1644                                                                             \
1645   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1646           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1647           "duration exceeds this threhold in milliseconds")                 \
1648                                                                             \
1649   develop(bool, CMSTraceIncrementalMode, false,                             \
1650           "Trace CMS incremental mode")                                     \
1651                                                                             \
1652   develop(bool, CMSTraceIncrementalPacing, false,                           \
1653           "Trace CMS incremental mode pacing computation")                  \
1654                                                                             \
1655   develop(bool, CMSTraceThreadState, false,                                 \
1656           "Trace the CMS thread state (enable the trace_state() method)")   \
1657                                                                             \
1658   product(bool, CMSClassUnloadingEnabled, true,                             \
1659           "Whether class unloading enabled when using CMS GC")              \
1660                                                                             \
1661   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1662           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1663           " for which classes may not be unloaded")                         \
1664                                                                             \
1665   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1666           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1667                                                                             \
1668   product(bool, UseCMSCompactAtFullCollection, true,                        \
1669           "Use mark sweep compact at full collections")                     \
1670                                                                             \
1671   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1672           "Number of CMS full collection done before compaction if > 0")    \
1673                                                                             \
1674   develop(intx, CMSDictionaryChoice, 0,                                     \
1675           "Use BinaryTreeDictionary as default in the CMS generation")      \
1676                                                                             \
1677   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1678           "Replenish an indexed free list with this number of chunks")      \
1679                                                                             \
1680   product(bool, CMSReplenishIntermediate, true,                             \
1681           "Replenish all intermediate free-list caches")                    \
1682                                                                             \
1683   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1684           "When satisfying batched demand, split blocks from the "          \
1685           "IndexedFreeList whose size is a multiple of requested size")     \
1686                                                                             \
1687   product(bool, CMSLoopWarn, false,                                         \
1688           "Warn in case of excessive CMS looping")                          \
1689                                                                             \
1690   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1691           "Whether preserved marks should be restored early")               \
1692                                                                             \
1693   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1694           "Size of marking stack")                                          \
1695                                                                             \
1696   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1697           "Max size of marking stack")                                      \
1698                                                                             \
1699   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1700           "Whether we should simulate frequent marking stack / work queue"  \
1701           " overflow")                                                      \
1702                                                                             \
1703   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1704           "An `interval' counter that determines how frequently"            \
1705           " we simulate overflow; a smaller number increases frequency")    \
1706                                                                             \
1707   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1708           "(Temporary, subject to experimentation)"                         \
1709           "Maximum number of abortable preclean iterations, if > 0")        \
1710                                                                             \
1711   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1712           "(Temporary, subject to experimentation)"                         \
1713           "Maximum time in abortable preclean in ms")                       \
1714                                                                             \
1715   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1716           "(Temporary, subject to experimentation)"                         \
1717           "Nominal minimum work per abortable preclean iteration")          \
1718                                                                             \
1719   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1720           "(Temporary, subject to experimentation)"                         \
1721           " Time that we sleep between iterations when not given"           \
1722           " enough work per iteration")                                     \
1723                                                                             \
1724   product(uintx, CMSRescanMultiple, 32,                                     \
1725           "Size (in cards) of CMS parallel rescan task")                    \
1726                                                                             \
1727   product(uintx, CMSConcMarkMultiple, 32,                                   \
1728           "Size (in cards) of CMS concurrent MT marking task")              \
1729                                                                             \
1730   product(bool, CMSAbortSemantics, false,                                   \
1731           "Whether abort-on-overflow semantics is implemented")             \
1732                                                                             \
1733   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1734           "Use the parallel initial mark.")                                 \
1735                                                                             \
1736   product(bool, CMSParallelRemarkEnabled, true,                             \
1737           "Whether parallel remark enabled (only if ParNewGC)")             \
1738                                                                             \
1739   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1740           "Whether parallel remark of survivor space"                       \
1741           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1742                                                                             \
1743   product(bool, CMSPLABRecordAlways, true,                                  \
1744           "Whether to always record survivor space PLAB bdries"             \
1745           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1746                                                                             \
1747   product(bool, CMSEdenChunksRecordAlways, true,                            \
1748           "Whether to always record eden chunks used for "                  \
1749           "the parallel initial mark or remark of eden" )                   \
1750                                                                             \
1751   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1752           "Print the eden and the survivor chunks used for the parallel "   \
1753           "initial mark or remark of the eden/survivor spaces")             \
1754                                                                             \
1755   product(bool, CMSConcurrentMTEnabled, true,                               \
1756           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1757                                                                             \
1758   product(bool, CMSPrecleaningEnabled, true,                                \
1759           "Whether concurrent precleaning enabled")                         \
1760                                                                             \
1761   product(uintx, CMSPrecleanIter, 3,                                        \
1762           "Maximum number of precleaning iteration passes")                 \
1763                                                                             \
1764   product(uintx, CMSPrecleanNumerator, 2,                                   \
1765           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1766           " ratio")                                                         \
1767                                                                             \
1768   product(uintx, CMSPrecleanDenominator, 3,                                 \
1769           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1770           " ratio")                                                         \
1771                                                                             \
1772   product(bool, CMSPrecleanRefLists1, true,                                 \
1773           "Preclean ref lists during (initial) preclean phase")             \
1774                                                                             \
1775   product(bool, CMSPrecleanRefLists2, false,                                \
1776           "Preclean ref lists during abortable preclean phase")             \
1777                                                                             \
1778   product(bool, CMSPrecleanSurvivors1, false,                               \
1779           "Preclean survivors during (initial) preclean phase")             \
1780                                                                             \
1781   product(bool, CMSPrecleanSurvivors2, true,                                \
1782           "Preclean survivors during abortable preclean phase")             \
1783                                                                             \
1784   product(uintx, CMSPrecleanThreshold, 1000,                                \
1785           "Don't re-iterate if #dirty cards less than this")                \
1786                                                                             \
1787   product(bool, CMSCleanOnEnter, true,                                      \
1788           "Clean-on-enter optimization for reducing number of dirty cards") \
1789                                                                             \
1790   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1791           "Choose variant (1,2) of verification following remark")          \
1792                                                                             \
1793   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1794           "If Eden used is below this value, don't try to schedule remark") \
1795                                                                             \
1796   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1797           "The Eden occupancy % at which to try and schedule remark pause") \
1798                                                                             \
1799   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1800           "Start sampling Eden top at least before yg occupancy reaches"    \
1801           " 1/<ratio> of the size at which we plan to schedule remark")     \
1802                                                                             \
1803   product(uintx, CMSSamplingGrain, 16*K,                                    \
1804           "The minimum distance between eden samples for CMS (see above)")  \
1805                                                                             \
1806   product(bool, CMSScavengeBeforeRemark, false,                             \
1807           "Attempt scavenge before the CMS remark step")                    \
1808                                                                             \
1809   develop(bool, CMSTraceSweeper, false,                                     \
1810           "Trace some actions of the CMS sweeper")                          \
1811                                                                             \
1812   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1813           "Don't drain below this size per parallel worker/thief")          \
1814                                                                             \
1815   manageable(intx, CMSWaitDuration, 2000,                                   \
1816           "Time in milliseconds that CMS thread waits for young GC")        \
1817                                                                             \
1818   develop(uintx, CMSCheckInterval, 1000,                                    \
1819           "Interval in milliseconds that CMS thread checks if it "          \
1820           "should start a collection cycle")                                \
1821                                                                             \
1822   product(bool, CMSYield, true,                                             \
1823           "Yield between steps of concurrent mark & sweep")                 \
1824                                                                             \
1825   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1826           "Bitmap operations should process at most this many bits"         \
1827           "between yields")                                                 \
1828                                                                             \
1829   product(bool, CMSDumpAtPromotionFailure, false,                           \
1830           "Dump useful information about the state of the CMS old "         \
1831           " generation upon a promotion failure.")                          \
1832                                                                             \
1833   product(bool, CMSPrintChunksInDump, false,                                \
1834           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1835           " more detailed information about the free chunks.")              \
1836                                                                             \
1837   product(bool, CMSPrintObjectsInDump, false,                               \
1838           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1839           " more detailed information about the allocated objects.")        \
1840                                                                             \
1841   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1842           "Verify that all refs across the FLS boundary "                   \
1843           " are to valid objects")                                          \
1844                                                                             \
1845   diagnostic(bool, FLSVerifyLists, false,                                   \
1846           "Do lots of (expensive) FreeListSpace verification")              \
1847                                                                             \
1848   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1849           "Do lots of (expensive) FLS index table verification")            \
1850                                                                             \
1851   develop(bool, FLSVerifyDictionary, false,                                 \
1852           "Do lots of (expensive) FLS dictionary verification")             \
1853                                                                             \
1854   develop(bool, VerifyBlockOffsetArray, false,                              \
1855           "Do (expensive!) block offset array verification")                \
1856                                                                             \
1857   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1858           "Maintain _unallocated_block in BlockOffsetArray"                 \
1859           " (currently applicable only to CMS collector)")                  \
1860                                                                             \
1861   develop(bool, TraceCMSState, false,                                       \
1862           "Trace the state of the CMS collection")                          \
1863                                                                             \
1864   product(intx, RefDiscoveryPolicy, 0,                                      \
1865           "Whether reference-based(0) or referent-based(1)")                \
1866                                                                             \
1867   product(bool, ParallelRefProcEnabled, false,                              \
1868           "Enable parallel reference processing whenever possible")         \
1869                                                                             \
1870   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1871           "Enable balancing of reference processing queues")                \
1872                                                                             \
1873   product(uintx, CMSTriggerRatio, 80,                                       \
1874           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1875           "allocated before a CMS collection cycle commences")              \
1876                                                                             \
1877   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1878           "Percentage CMS generation occupancy at which to "                \
1879           "initiate CMS collection for bootstrapping collection stats")     \
1880                                                                             \
1881   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1882           "Percentage CMS generation occupancy to start a CMS collection "  \
1883           "cycle. A negative value means that CMSTriggerRatio is used")     \
1884                                                                             \
1885   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1886           "Percentage of the (entire) heap occupancy to start a "           \
1887           "concurrent GC cycle. It is used by GCs that trigger a "          \
1888           "concurrent GC cycle based on the occupancy of the entire heap, " \
1889           "not just one of the generations (e.g., G1). A value of 0 "       \
1890           "denotes 'do constant GC cycles'.")                               \
1891                                                                             \
1892   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1893           "Only use occupancy as a crierion for starting a CMS collection") \
1894                                                                             \
1895   product(uintx, CMSIsTooFullPercentage, 98,                                \
1896           "An absolute ceiling above which CMS will always consider the "   \
1897           "unloading of classes when class unloading is enabled")           \
1898                                                                             \
1899   develop(bool, CMSTestInFreeList, false,                                   \
1900           "Check if the coalesced range is already in the "                 \
1901           "free lists as claimed")                                          \
1902                                                                             \
1903   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1904           "Check that all the garbage collected was returned to the "       \
1905           "free lists.")                                                    \
1906                                                                             \
1907   notproduct(bool, ScavengeALot, false,                                     \
1908           "Force scavenge at every Nth exit from the runtime system "       \
1909           "(N=ScavengeALotInterval)")                                       \
1910                                                                             \
1911   develop(bool, FullGCALot, false,                                          \
1912           "Force full gc at every Nth exit from the runtime system "        \
1913           "(N=FullGCALotInterval)")                                         \
1914                                                                             \
1915   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1916           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1917                                                                             \
1918   product(bool, PrintPromotionFailure, false,                               \
1919           "Print additional diagnostic information following "              \
1920           " promotion failure")                                             \
1921                                                                             \
1922   notproduct(bool, PromotionFailureALot, false,                             \
1923           "Use promotion failure handling on every youngest generation "    \
1924           "collection")                                                     \
1925                                                                             \
1926   develop(uintx, PromotionFailureALotCount, 1000,                           \
1927           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1928           "refill attempts (ParNew) or promotion attempts "                 \
1929           "(other young collectors) ")                                      \
1930                                                                             \
1931   develop(uintx, PromotionFailureALotInterval, 5,                           \
1932           "Total collections between promotion failures alot")              \
1933                                                                             \
1934   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1935           "Sleep time when sleep is used for yields")                       \
1936                                                                             \
1937   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1938           "Number of yields before a sleep is done during workstealing")    \
1939                                                                             \
1940   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1941           "Number of iterations in a spin loop between checks on "          \
1942           "time out of hard spin")                                          \
1943                                                                             \
1944   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1945           "Ratio of hard spins to calls to yield")                          \
1946                                                                             \
1947   develop(uintx, ObjArrayMarkingStride, 512,                                \
1948           "Number of ObjArray elements to push onto the marking stack"      \
1949           "before pushing a continuation entry")                            \
1950                                                                             \
1951   develop(bool, MetadataAllocationFailALot, false,                          \
1952           "Fail metadata allocations at intervals controlled by "           \
1953           "MetadataAllocationFailALotInterval")                             \
1954                                                                             \
1955   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1956           "metadata allocation failure alot interval")                      \
1957                                                                             \
1958   develop(bool, MetaDataDeallocateALot, false,                              \
1959           "Deallocation bunches of metadata at intervals controlled by "    \
1960           "MetaDataAllocateALotInterval")                                   \
1961                                                                             \
1962   develop(uintx, MetaDataDeallocateALotInterval, 100,                       \
1963           "Metadata deallocation alot interval")                            \
1964                                                                             \
1965   develop(bool, TraceMetadataChunkAllocation, false,                        \
1966           "Trace chunk metadata allocations")                               \
1967                                                                             \
1968   product(bool, TraceMetadataHumongousAllocation, false,                    \
1969           "Trace humongous metadata allocations")                           \
1970                                                                             \
1971   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1972           "Trace virtual space metadata allocations")                       \
1973                                                                             \
1974   notproduct(bool, ExecuteInternalVMTests, false,                           \
1975           "Enable execution of internal VM tests.")                         \
1976                                                                             \
1977   notproduct(bool, VerboseInternalVMTests, false,                           \
1978           "Turn on logging for internal VM tests.")                         \
1979                                                                             \
1980   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1981                                                                             \
1982   product_pd(bool, ResizeTLAB,                                              \
1983           "Dynamically resize tlab size for threads")                       \
1984                                                                             \
1985   product(bool, ZeroTLAB, false,                                            \
1986           "Zero out the newly created TLAB")                                \
1987                                                                             \
1988   product(bool, FastTLABRefill, true,                                       \
1989           "Use fast TLAB refill code")                                      \
1990                                                                             \
1991   product(bool, PrintTLAB, false,                                           \
1992           "Print various TLAB related information")                         \
1993                                                                             \
1994   product(bool, TLABStats, true,                                            \
1995           "Print various TLAB related information")                         \
1996                                                                             \
1997   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
1998           "Enable LowMemoryProtection"))                                    \
1999                                                                             \
2000   product_pd(bool, NeverActAsServerClassMachine,                            \
2001           "Never act like a server-class machine")                          \
2002                                                                             \
2003   product(bool, AlwaysActAsServerClassMachine, false,                       \
2004           "Always act like a server-class machine")                         \
2005                                                                             \
2006   product_pd(uint64_t, MaxRAM,                                              \
2007           "Real memory size (in bytes) used to set maximum heap size")      \
2008                                                                             \
2009   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2010           "Maximum ergonomically set heap size (in bytes); zero means use " \
2011           "MaxRAM / MaxRAMFraction")                                        \
2012                                                                             \
2013   product(uintx, MaxRAMFraction, 4,                                         \
2014           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2015           "size")                                                           \
2016                                                                             \
2017   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2018           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2019           "size; deprecated: to be renamed to MaxRAMFraction")              \
2020                                                                             \
2021   product(uintx, MinRAMFraction, 2,                                         \
2022           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2023           "size on systems with small physical memory size")                \
2024                                                                             \
2025   product(uintx, InitialRAMFraction, 64,                                    \
2026           "Fraction (1/n) of real memory used for initial heap size")       \
2027                                                                             \
2028   develop(uintx, MaxVirtMemFraction, 2,                                     \
2029           "Maximum fraction (1/n) of virtual memory used for ergonomically" \
2030           "determining maximum heap size")                                  \
2031                                                                             \
2032   product(bool, UseAutoGCSelectPolicy, false,                               \
2033           "Use automatic collection selection policy")                      \
2034                                                                             \
2035   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2036           "Automatic GC selection pause threshhold in ms")                  \
2037                                                                             \
2038   product(bool, UseAdaptiveSizePolicy, true,                                \
2039           "Use adaptive generation sizing policies")                        \
2040                                                                             \
2041   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2042           "Use adaptive survivor sizing policies")                          \
2043                                                                             \
2044   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2045           "Use adaptive young-old sizing policies at minor collections")    \
2046                                                                             \
2047   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2048           "Use adaptive young-old sizing policies at major collections")    \
2049                                                                             \
2050   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2051           "Use statistics from System.GC for adaptive size policy")         \
2052                                                                             \
2053   product(bool, UseAdaptiveGCBoundary, false,                               \
2054           "Allow young-old boundary to move")                               \
2055                                                                             \
2056   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2057           "Trace young-old boundary moves")                                 \
2058                                                                             \
2059   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2060           "Resize the virtual spaces of the young or old generations")      \
2061                                                                             \
2062   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2063           "Policy for changeing generation size for throughput goals")      \
2064                                                                             \
2065   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2066           "Policy for changing generation size for pause goals")            \
2067                                                                             \
2068   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2069           "Adjust tenured generation to achive a minor pause goal")         \
2070                                                                             \
2071   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2072           "Adjust young generation to achive a major pause goal")           \
2073                                                                             \
2074   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2075           "Number of steps where heuristics is used before data is used")   \
2076                                                                             \
2077   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2078           "Number of collections before the adaptive sizing is started")    \
2079                                                                             \
2080   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2081           "Collection interval for printing information; zero means never") \
2082                                                                             \
2083   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2084           "Use adaptive minimum footprint as a goal")                       \
2085                                                                             \
2086   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2087           "Weight given to exponential resizing, between 0 and 100")        \
2088                                                                             \
2089   product(uintx, AdaptiveTimeWeight,       25,                              \
2090           "Weight given to time in adaptive policy, between 0 and 100")     \
2091                                                                             \
2092   product(uintx, PausePadding, 1,                                           \
2093           "How much buffer to keep for pause time")                         \
2094                                                                             \
2095   product(uintx, PromotedPadding, 3,                                        \
2096           "How much buffer to keep for promotion failure")                  \
2097                                                                             \
2098   product(uintx, SurvivorPadding, 3,                                        \
2099           "How much buffer to keep for survivor overflow")                  \
2100                                                                             \
2101   product(uintx, ThresholdTolerance, 10,                                    \
2102           "Allowed collection cost difference between generations")         \
2103                                                                             \
2104   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2105           "If collection costs are within margin, reduce both by full "     \
2106           "delta")                                                          \
2107                                                                             \
2108   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2109           "Adaptive size percentage change in young generation")            \
2110                                                                             \
2111   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2112           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2113                                                                             \
2114   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2115           "Decay factor to YoungedGenerationSizeSupplement")                \
2116                                                                             \
2117   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2118           "Adaptive size percentage change in tenured generation")          \
2119                                                                             \
2120   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2121           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2122                                                                             \
2123   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2124           "Decay factor to TenuredGenerationSizeIncrement")                 \
2125                                                                             \
2126   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2127           "Adaptive size policy maximum GC pause time goal in msec, "       \
2128           "or (G1 Only) the max. GC time per MMU time slice")               \
2129                                                                             \
2130   product(uintx, GCPauseIntervalMillis, 0,                                  \
2131           "Time slice for MMU specification")                               \
2132                                                                             \
2133   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2134           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2135                                                                             \
2136   product(uintx, GCTimeRatio, 99,                                           \
2137           "Adaptive size policy application time to GC time ratio")         \
2138                                                                             \
2139   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2140           "Adaptive size scale down factor for shrinking")                  \
2141                                                                             \
2142   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2143           "Adaptive size decays the major cost for long major intervals")   \
2144                                                                             \
2145   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2146           "Time scale over which major costs decay")                        \
2147                                                                             \
2148   product(uintx, MinSurvivorRatio, 3,                                       \
2149           "Minimum ratio of young generation/survivor space size")          \
2150                                                                             \
2151   product(uintx, InitialSurvivorRatio, 8,                                   \
2152           "Initial ratio of eden/survivor space size")                      \
2153                                                                             \
2154   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2155           "Estimate of footprint other than Java Heap")                     \
2156                                                                             \
2157   product(bool, UseGCOverheadLimit, true,                                   \
2158           "Use policy to limit of proportion of time spent in GC "          \
2159           "before an OutOfMemory error is thrown")                          \
2160                                                                             \
2161   product(uintx, GCTimeLimit, 98,                                           \
2162           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2163           "error is thrown (used with GCHeapFreeLimit)")                    \
2164                                                                             \
2165   product(uintx, GCHeapFreeLimit, 2,                                        \
2166           "Minimum percentage of free space after a full GC before an "     \
2167           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2168                                                                             \
2169   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2170           "Number of consecutive collections before gc time limit fires")   \
2171                                                                             \
2172   product(bool, PrintAdaptiveSizePolicy, false,                             \
2173           "Print information about AdaptiveSizePolicy")                     \
2174                                                                             \
2175   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2176           "How far ahead to prefetch destination area (<= 0 means off)")    \
2177                                                                             \
2178   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2179           "How far ahead to prefetch scan area (<= 0 means off)")           \
2180                                                                             \
2181   product(intx, PrefetchFieldsAhead, -1,                                    \
2182           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2183                                                                             \
2184   diagnostic(bool, VerifySilently, false,                                   \
2185           "Don't print print the verification progress")                    \
2186                                                                             \
2187   diagnostic(bool, VerifyDuringStartup, false,                              \
2188           "Verify memory system before executing any Java code "            \
2189           "during VM initialization")                                       \
2190                                                                             \
2191   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2192           "Verify system before exiting")                                   \
2193                                                                             \
2194   diagnostic(bool, VerifyBeforeGC, false,                                   \
2195           "Verify memory system before GC")                                 \
2196                                                                             \
2197   diagnostic(bool, VerifyAfterGC, false,                                    \
2198           "Verify memory system after GC")                                  \
2199                                                                             \
2200   diagnostic(bool, VerifyDuringGC, false,                                   \
2201           "Verify memory system during GC (between phases)")                \
2202                                                                             \
2203   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2204           "Enable parallel memory system verification")                     \
2205                                                                             \
2206   diagnostic(bool, DeferInitialCardMark, false,                             \
2207           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2208            "may arise from new_pre_store_barrier")                          \
2209                                                                             \
2210   diagnostic(bool, VerifyRememberedSets, false,                             \
2211           "Verify GC remembered sets")                                      \
2212                                                                             \
2213   diagnostic(bool, VerifyObjectStartArray, true,                            \
2214           "Verify GC object start array if verify before/after")            \
2215                                                                             \
2216   product(bool, DisableExplicitGC, false,                                   \
2217           "Tells whether calling System.gc() does a full GC")               \
2218                                                                             \
2219   notproduct(bool, CheckMemoryInitialization, false,                        \
2220           "Checks memory initialization")                                   \
2221                                                                             \
2222   product(bool, CollectGen0First, false,                                    \
2223           "Collect youngest generation before each full GC")                \
2224                                                                             \
2225   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2226           "Bind CMS Thread to CPU if possible")                             \
2227                                                                             \
2228   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2229           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2230                                                                             \
2231   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2232           "Bind GCTaskThreads to CPUs if possible")                         \
2233                                                                             \
2234   product(bool, UseGCTaskAffinity, false,                                   \
2235           "Use worker affinity when asking for GCTasks")                    \
2236                                                                             \
2237   product(uintx, ProcessDistributionStride, 4,                              \
2238           "Stride through processors when distributing processes")          \
2239                                                                             \
2240   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2241           "number of times the coordinator GC thread will sleep while "     \
2242           "yielding before giving up and resuming GC")                      \
2243                                                                             \
2244   product(uintx, CMSYieldSleepCount, 0,                                     \
2245           "number of times a GC thread (minus the coordinator) "            \
2246           "will sleep while yielding before giving up and resuming GC")     \
2247                                                                             \
2248   /* gc tracing */                                                          \
2249   manageable(bool, PrintGC, false,                                          \
2250           "Print message at garbage collect")                               \
2251                                                                             \
2252   manageable(bool, PrintGCDetails, false,                                   \
2253           "Print more details at garbage collect")                          \
2254                                                                             \
2255   manageable(bool, PrintGCDateStamps, false,                                \
2256           "Print date stamps at garbage collect")                           \
2257                                                                             \
2258   manageable(bool, PrintGCTimeStamps, false,                                \
2259           "Print timestamps at garbage collect")                            \
2260                                                                             \
2261   product(bool, PrintGCTaskTimeStamps, false,                               \
2262           "Print timestamps for individual gc worker thread tasks")         \
2263                                                                             \
2264   develop(intx, ConcGCYieldTimeout, 0,                                      \
2265           "If non-zero, assert that GC threads yield within this # of ms.") \
2266                                                                             \
2267   notproduct(bool, TraceMarkSweep, false,                                   \
2268           "Trace mark sweep")                                               \
2269                                                                             \
2270   product(bool, PrintReferenceGC, false,                                    \
2271           "Print times spent handling reference objects during GC "         \
2272           " (enabled only when PrintGCDetails)")                            \
2273                                                                             \
2274   develop(bool, TraceReferenceGC, false,                                    \
2275           "Trace handling of soft/weak/final/phantom references")           \
2276                                                                             \
2277   develop(bool, TraceFinalizerRegistration, false,                          \
2278          "Trace registration of final references")                          \
2279                                                                             \
2280   notproduct(bool, TraceScavenge, false,                                    \
2281           "Trace scavenge")                                                 \
2282                                                                             \
2283   product_rw(bool, TraceClassLoading, false,                                \
2284           "Trace all classes loaded")                                       \
2285                                                                             \
2286   product(bool, TraceClassLoadingPreorder, false,                           \
2287           "Trace all classes loaded in order referenced (not loaded)")      \
2288                                                                             \
2289   product_rw(bool, TraceClassUnloading, false,                              \
2290           "Trace unloading of classes")                                     \
2291                                                                             \
2292   product_rw(bool, TraceLoaderConstraints, false,                           \
2293           "Trace loader constraints")                                       \
2294                                                                             \
2295   develop(bool, TraceClassLoaderData, false,                                \
2296           "Trace class loader loader_data lifetime")                        \
2297                                                                             \
2298   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2299           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2300           "Initial size of the boot class loader data metaspace")           \
2301                                                                             \
2302   product(bool, TraceGen0Time, false,                                       \
2303           "Trace accumulated time for Gen 0 collection")                    \
2304                                                                             \
2305   product(bool, TraceGen1Time, false,                                       \
2306           "Trace accumulated time for Gen 1 collection")                    \
2307                                                                             \
2308   product(bool, PrintTenuringDistribution, false,                           \
2309           "Print tenuring age information")                                 \
2310                                                                             \
2311   product_rw(bool, PrintHeapAtGC, false,                                    \
2312           "Print heap layout before and after each GC")                     \
2313                                                                             \
2314   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2315           "Prints extended information about the layout of the heap "       \
2316           "when -XX:+PrintHeapAtGC is set")                                 \
2317                                                                             \
2318   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2319           "Print heap layout in response to SIGBREAK")                      \
2320                                                                             \
2321   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2322           "Print a class histogram before any major stop-world GC")         \
2323                                                                             \
2324   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2325           "Print a class histogram after any major stop-world GC")          \
2326                                                                             \
2327   manageable(bool, PrintClassHistogram, false,                              \
2328           "Print a histogram of class instances")                           \
2329                                                                             \
2330   develop(bool, TraceWorkGang, false,                                       \
2331           "Trace activities of work gangs")                                 \
2332                                                                             \
2333   product(bool, TraceParallelOldGCTasks, false,                             \
2334           "Trace multithreaded GC activity")                                \
2335                                                                             \
2336   develop(bool, TraceBlockOffsetTable, false,                               \
2337           "Print BlockOffsetTable maps")                                    \
2338                                                                             \
2339   develop(bool, TraceCardTableModRefBS, false,                              \
2340           "Print CardTableModRefBS maps")                                   \
2341                                                                             \
2342   develop(bool, TraceGCTaskManager, false,                                  \
2343           "Trace actions of the GC task manager")                           \
2344                                                                             \
2345   develop(bool, TraceGCTaskQueue, false,                                    \
2346           "Trace actions of the GC task queues")                            \
2347                                                                             \
2348   diagnostic(bool, TraceGCTaskThread, false,                                \
2349           "Trace actions of the GC task threads")                           \
2350                                                                             \
2351   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2352           "Print the time taken by each parallel old gc phase."             \
2353           "PrintGCDetails must also be enabled.")                           \
2354                                                                             \
2355   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2356           "Trace parallel old gc marking phase")                            \
2357                                                                             \
2358   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2359           "Trace parallel old gc summary phase")                            \
2360                                                                             \
2361   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2362           "Trace parallel old gc compaction phase")                         \
2363                                                                             \
2364   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2365           "Trace parallel old gc dense prefix computation")                 \
2366                                                                             \
2367   develop(bool, IgnoreLibthreadGPFault, false,                              \
2368           "Suppress workaround for libthread GP fault")                     \
2369                                                                             \
2370   product(bool, PrintJNIGCStalls, false,                                    \
2371           "Print diagnostic message when GC is stalled"                     \
2372           "by JNI critical section")                                        \
2373                                                                             \
2374   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2375           "The percentage of the used heap that the instances of a class "  \
2376           "must occupy for the class to generate a trace event.")           \
2377                                                                             \
2378   /* GC log rotation setting */                                             \
2379                                                                             \
2380   product(bool, UseGCLogFileRotation, false,                                \
2381           "Prevent large gclog file for long running app. "                 \
2382           "Requires -Xloggc:<filename>")                                    \
2383                                                                             \
2384   product(uintx, NumberOfGCLogFiles, 0,                                     \
2385           "Number of gclog files in rotation, "                             \
2386           "Default: 0, no rotation")                                        \
2387                                                                             \
2388   product(uintx, GCLogFileSize, 0,                                          \
2389           "GC log file size, Default: 0 bytes, no rotation "                \
2390           "Only valid with UseGCLogFileRotation")                           \
2391                                                                             \
2392   /* JVMTI heap profiling */                                                \
2393                                                                             \
2394   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2395           "Trace JVMTI object tagging calls")                               \
2396                                                                             \
2397   diagnostic(bool, VerifyBeforeIteration, false,                            \
2398           "Verify memory system before JVMTI iteration")                    \
2399                                                                             \
2400   /* compiler interface */                                                  \
2401                                                                             \
2402   develop(bool, CIPrintCompilerName, false,                                 \
2403           "when CIPrint is active, print the name of the active compiler")  \
2404                                                                             \
2405   develop(bool, CIPrintCompileQueue, false,                                 \
2406           "display the contents of the compile queue whenever a "           \
2407           "compilation is enqueued")                                        \
2408                                                                             \
2409   develop(bool, CIPrintRequests, false,                                     \
2410           "display every request for compilation")                          \
2411                                                                             \
2412   product(bool, CITime, false,                                              \
2413           "collect timing information for compilation")                     \
2414                                                                             \
2415   develop(bool, CITimeEach, false,                                          \
2416           "display timing information after each successful compilation")   \
2417                                                                             \
2418   develop(bool, CICountOSR, false,                                          \
2419           "use a separate counter when assigning ids to osr compilations")  \
2420                                                                             \
2421   develop(bool, CICompileNatives, true,                                     \
2422           "compile native methods if supported by the compiler")            \
2423                                                                             \
2424   develop_pd(bool, CICompileOSR,                                            \
2425           "compile on stack replacement methods if supported by the "       \
2426           "compiler")                                                       \
2427                                                                             \
2428   develop(bool, CIPrintMethodCodes, false,                                  \
2429           "print method bytecodes of the compiled code")                    \
2430                                                                             \
2431   develop(bool, CIPrintTypeFlow, false,                                     \
2432           "print the results of ciTypeFlow analysis")                       \
2433                                                                             \
2434   develop(bool, CITraceTypeFlow, false,                                     \
2435           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2436                                                                             \
2437   develop(intx, OSROnlyBCI, -1,                                             \
2438           "OSR only at this bci.  Negative values mean exclude that bci")   \
2439                                                                             \
2440   /* compiler */                                                            \
2441                                                                             \
2442   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2443           "Number of compiler threads to run")                              \
2444                                                                             \
2445   product(intx, CompilationPolicyChoice, 0,                                 \
2446           "which compilation policy (0/1)")                                 \
2447                                                                             \
2448   develop(bool, UseStackBanging, true,                                      \
2449           "use stack banging for stack overflow checks (required for "      \
2450           "proper StackOverflow handling; disable only to measure cost "    \
2451           "of stackbanging)")                                               \
2452                                                                             \
2453   develop(bool, UseStrictFP, true,                                          \
2454           "use strict fp if modifier strictfp is set")                      \
2455                                                                             \
2456   develop(bool, GenerateSynchronizationCode, true,                          \
2457           "generate locking/unlocking code for synchronized methods and "   \
2458           "monitors")                                                       \
2459                                                                             \
2460   develop(bool, GenerateCompilerNullChecks, true,                           \
2461           "Generate explicit null checks for loads/stores/calls")           \
2462                                                                             \
2463   develop(bool, GenerateRangeChecks, true,                                  \
2464           "Generate range checks for array accesses")                       \
2465                                                                             \
2466   develop_pd(bool, ImplicitNullChecks,                                      \
2467           "generate code for implicit null checks")                         \
2468                                                                             \
2469   product(bool, PrintSafepointStatistics, false,                            \
2470           "print statistics about safepoint synchronization")               \
2471                                                                             \
2472   product(intx, PrintSafepointStatisticsCount, 300,                         \
2473           "total number of safepoint statistics collected "                 \
2474           "before printing them out")                                       \
2475                                                                             \
2476   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2477           "print safepoint statistics only when safepoint takes"            \
2478           " more than PrintSafepointSatisticsTimeout in millis")            \
2479                                                                             \
2480   product(bool, TraceSafepointCleanupTime, false,                           \
2481           "print the break down of clean up tasks performed during"         \
2482           " safepoint")                                                     \
2483                                                                             \
2484   product(bool, Inline, true,                                               \
2485           "enable inlining")                                                \
2486                                                                             \
2487   product(bool, ClipInlining, true,                                         \
2488           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2489                                                                             \
2490   develop(bool, UseCHA, true,                                               \
2491           "enable CHA")                                                     \
2492                                                                             \
2493   product(bool, UseTypeProfile, true,                                       \
2494           "Check interpreter profile for historically monomorphic calls")   \
2495                                                                             \
2496   notproduct(bool, TimeCompiler, false,                                     \
2497           "time the compiler")                                              \
2498                                                                             \
2499   diagnostic(bool, PrintInlining, false,                                    \
2500           "prints inlining optimizations")                                  \
2501                                                                             \
2502   product(bool, UsePopCountInstruction, false,                              \
2503           "Use population count instruction")                               \
2504                                                                             \
2505   develop(bool, EagerInitialization, false,                                 \
2506           "Eagerly initialize classes if possible")                         \
2507                                                                             \
2508   develop(bool, TraceMethodReplacement, false,                              \
2509           "Print when methods are replaced do to recompilation")            \
2510                                                                             \
2511   develop(bool, PrintMethodFlushing, false,                                 \
2512           "print the nmethods being flushed")                               \
2513                                                                             \
2514   develop(bool, UseRelocIndex, false,                                       \
2515          "use an index to speed random access to relocations")              \
2516                                                                             \
2517   develop(bool, StressCodeBuffers, false,                                   \
2518          "Exercise code buffer expansion and other rare state changes")     \
2519                                                                             \
2520   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2521          "Generate extra debugging info for non-safepoints in nmethods")    \
2522                                                                             \
2523   product(bool, PrintVMOptions, false,                                      \
2524          "Print flags that appeared on the command line")                   \
2525                                                                             \
2526   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2527          "Ignore unrecognized VM options")                                  \
2528                                                                             \
2529   product(bool, PrintCommandLineFlags, false,                               \
2530          "Print flags specified on command line or set by ergonomics")      \
2531                                                                             \
2532   product(bool, PrintFlagsInitial, false,                                   \
2533          "Print all VM flags before argument processing and exit VM")       \
2534                                                                             \
2535   product(bool, PrintFlagsFinal, false,                                     \
2536          "Print all VM flags after argument and ergonomic processing")      \
2537                                                                             \
2538   notproduct(bool, PrintFlagsWithComments, false,                           \
2539          "Print all VM flags with default values and descriptions and exit")\
2540                                                                             \
2541   diagnostic(bool, SerializeVMOutput, true,                                 \
2542          "Use a mutex to serialize output to tty and LogFile")              \
2543                                                                             \
2544   diagnostic(bool, DisplayVMOutput, true,                                   \
2545          "Display all VM output on the tty, independently of LogVMOutput")  \
2546                                                                             \
2547   diagnostic(bool, LogVMOutput, false,                                      \
2548          "Save VM output to LogFile")                                       \
2549                                                                             \
2550   diagnostic(ccstr, LogFile, NULL,                                          \
2551          "If LogVMOutput or LogCompilation is on, save VM output to "       \
2552          "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)") \
2553                                                                             \
2554   product(ccstr, ErrorFile, NULL,                                           \
2555          "If an error occurs, save the error data to this file "            \
2556          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2557                                                                             \
2558   product(bool, DisplayVMOutputToStderr, false,                             \
2559          "If DisplayVMOutput is true, display all VM output to stderr")     \
2560                                                                             \
2561   product(bool, DisplayVMOutputToStdout, false,                             \
2562          "If DisplayVMOutput is true, display all VM output to stdout")     \
2563                                                                             \
2564   product(bool, UseHeavyMonitors, false,                                    \
2565           "use heavyweight instead of lightweight Java monitors")           \
2566                                                                             \
2567   product(bool, PrintStringTableStatistics, false,                          \
2568           "print statistics about the StringTable and SymbolTable")         \
2569                                                                             \
2570   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2571           "verify StringTable contents at exit")                            \
2572                                                                             \
2573   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2574           "print histogram of the symbol table")                            \
2575                                                                             \
2576   notproduct(bool, ExitVMOnVerifyError, false,                              \
2577           "standard exit from VM if bytecode verify error "                 \
2578           "(only in debug mode)")                                           \
2579                                                                             \
2580   notproduct(ccstr, AbortVMOnException, NULL,                               \
2581           "Call fatal if this exception is thrown.  Example: "              \
2582           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2583                                                                             \
2584   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2585           "Call fatal if the exception pointed by AbortVMOnException "      \
2586           "has this message.")                                              \
2587                                                                             \
2588   develop(bool, DebugVtables, false,                                        \
2589           "add debugging code to vtable dispatch")                          \
2590                                                                             \
2591   develop(bool, PrintVtables, false,                                        \
2592           "print vtables when printing klass")                              \
2593                                                                             \
2594   notproduct(bool, PrintVtableStats, false,                                 \
2595           "print vtables stats at end of run")                              \
2596                                                                             \
2597   develop(bool, TraceCreateZombies, false,                                  \
2598           "trace creation of zombie nmethods")                              \
2599                                                                             \
2600   notproduct(bool, IgnoreLockingAssertions, false,                          \
2601           "disable locking assertions (for speed)")                         \
2602                                                                             \
2603   product(bool, RangeCheckElimination, true,                                \
2604           "Eliminate range checks")                                         \
2605                                                                             \
2606   develop_pd(bool, UncommonNullCast,                                        \
2607           "track occurrences of null in casts; adjust compiler tactics")    \
2608                                                                             \
2609   develop(bool, TypeProfileCasts,  true,                                    \
2610           "treat casts like calls for purposes of type profiling")          \
2611                                                                             \
2612   develop(bool, DelayCompilationDuringStartup, true,                        \
2613           "Delay invoking the compiler until main application class is "    \
2614           "loaded")                                                         \
2615                                                                             \
2616   develop(bool, CompileTheWorld, false,                                     \
2617           "Compile all methods in all classes in bootstrap class path "     \
2618           "(stress test)")                                                  \
2619                                                                             \
2620   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2621           "Preload all classes used by a class before start loading")       \
2622                                                                             \
2623   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2624           "Force a safepoint every n compiles so sweeper can keep up")      \
2625                                                                             \
2626   develop(bool, FillDelaySlots, true,                                       \
2627           "Fill delay slots (on SPARC only)")                               \
2628                                                                             \
2629   develop(bool, TimeLivenessAnalysis, false,                                \
2630           "Time computation of bytecode liveness analysis")                 \
2631                                                                             \
2632   develop(bool, TraceLivenessGen, false,                                    \
2633           "Trace the generation of liveness analysis information")          \
2634                                                                             \
2635   notproduct(bool, TraceLivenessQuery, false,                               \
2636           "Trace queries of liveness analysis information")                 \
2637                                                                             \
2638   notproduct(bool, CollectIndexSetStatistics, false,                        \
2639           "Collect information about IndexSets")                            \
2640                                                                             \
2641   develop(bool, UseLoopSafepoints, true,                                    \
2642           "Generate Safepoint nodes in every loop")                         \
2643                                                                             \
2644   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2645           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2646           "Inline allocations larger than this in doublewords must go slow")\
2647                                                                             \
2648   product(bool, AggressiveOpts, false,                                      \
2649           "Enable aggressive optimizations - see arguments.cpp")            \
2650                                                                             \
2651   /* statistics */                                                          \
2652   develop(bool, CountCompiledCalls, false,                                  \
2653           "counts method invocations")                                      \
2654                                                                             \
2655   notproduct(bool, CountRuntimeCalls, false,                                \
2656           "counts VM runtime calls")                                        \
2657                                                                             \
2658   develop(bool, CountJNICalls, false,                                       \
2659           "counts jni method invocations")                                  \
2660                                                                             \
2661   notproduct(bool, CountJVMCalls, false,                                    \
2662           "counts jvm method invocations")                                  \
2663                                                                             \
2664   notproduct(bool, CountRemovableExceptions, false,                         \
2665           "count exceptions that could be replaced by branches due to "     \
2666           "inlining")                                                       \
2667                                                                             \
2668   notproduct(bool, ICMissHistogram, false,                                  \
2669           "produce histogram of IC misses")                                 \
2670                                                                             \
2671   notproduct(bool, PrintClassStatistics, false,                             \
2672           "prints class statistics at end of run")                          \
2673                                                                             \
2674   notproduct(bool, PrintMethodStatistics, false,                            \
2675           "prints method statistics at end of run")                         \
2676                                                                             \
2677   /* interpreter */                                                         \
2678   develop(bool, ClearInterpreterLocals, false,                              \
2679           "Always clear local variables of interpreter activations upon "   \
2680           "entry")                                                          \
2681                                                                             \
2682   product_pd(bool, RewriteBytecodes,                                        \
2683           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2684                                                                             \
2685   product_pd(bool, RewriteFrequentPairs,                                    \
2686           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2687                                                                             \
2688   diagnostic(bool, PrintInterpreter, false,                                 \
2689           "Prints the generated interpreter code")                          \
2690                                                                             \
2691   product(bool, UseInterpreter, true,                                       \
2692           "Use interpreter for non-compiled methods")                       \
2693                                                                             \
2694   develop(bool, UseFastSignatureHandlers, true,                             \
2695           "Use fast signature handlers for native calls")                   \
2696                                                                             \
2697   product(bool, UseLoopCounter, true,                                       \
2698           "Increment invocation counter on backward branch")                \
2699                                                                             \
2700   product(bool, UseFastEmptyMethods, true,                                  \
2701           "Use fast method entry code for empty methods")                   \
2702                                                                             \
2703   product(bool, UseFastAccessorMethods, true,                               \
2704           "Use fast method entry code for accessor methods")                \
2705                                                                             \
2706   product_pd(bool, UseOnStackReplacement,                                   \
2707            "Use on stack replacement, calls runtime if invoc. counter "     \
2708            "overflows in loop")                                             \
2709                                                                             \
2710   notproduct(bool, TraceOnStackReplacement, false,                          \
2711           "Trace on stack replacement")                                     \
2712                                                                             \
2713   product_pd(bool, PreferInterpreterNativeStubs,                            \
2714           "Use always interpreter stubs for native methods invoked via "    \
2715           "interpreter")                                                    \
2716                                                                             \
2717   develop(bool, CountBytecodes, false,                                      \
2718           "Count number of bytecodes executed")                             \
2719                                                                             \
2720   develop(bool, PrintBytecodeHistogram, false,                              \
2721           "Print histogram of the executed bytecodes")                      \
2722                                                                             \
2723   develop(bool, PrintBytecodePairHistogram, false,                          \
2724           "Print histogram of the executed bytecode pairs")                 \
2725                                                                             \
2726   diagnostic(bool, PrintSignatureHandlers, false,                           \
2727           "Print code generated for native method signature handlers")      \
2728                                                                             \
2729   develop(bool, VerifyOops, false,                                          \
2730           "Do plausibility checks for oops")                                \
2731                                                                             \
2732   develop(bool, CheckUnhandledOops, false,                                  \
2733           "Check for unhandled oops in VM code")                            \
2734                                                                             \
2735   develop(bool, VerifyJNIFields, trueInDebug,                               \
2736           "Verify jfieldIDs for instance fields")                           \
2737                                                                             \
2738   notproduct(bool, VerifyJNIEnvThread, false,                               \
2739           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2740           "from JNI")                                                       \
2741                                                                             \
2742   develop(bool, VerifyFPU, false,                                           \
2743           "Verify FPU state (check for NaN's, etc.)")                       \
2744                                                                             \
2745   develop(bool, VerifyThread, false,                                        \
2746           "Watch the thread register for corruption (SPARC only)")          \
2747                                                                             \
2748   develop(bool, VerifyActivationFrameSize, false,                           \
2749           "Verify that activation frame didn't become smaller than its "    \
2750           "minimal size")                                                   \
2751                                                                             \
2752   develop(bool, TraceFrequencyInlining, false,                              \
2753           "Trace frequency based inlining")                                 \
2754                                                                             \
2755   develop_pd(bool, InlineIntrinsics,                                        \
2756            "Inline intrinsics that can be statically resolved")             \
2757                                                                             \
2758   product_pd(bool, ProfileInterpreter,                                      \
2759            "Profile at the bytecode level during interpretation")           \
2760                                                                             \
2761   develop_pd(bool, ProfileTraps,                                            \
2762           "Profile deoptimization traps at the bytecode level")             \
2763                                                                             \
2764   product(intx, ProfileMaturityPercentage, 20,                              \
2765           "number of method invocations/branches (expressed as % of "       \
2766           "CompileThreshold) before using the method's profile")            \
2767                                                                             \
2768   develop(bool, PrintMethodData, false,                                     \
2769            "Print the results of +ProfileInterpreter at end of run")        \
2770                                                                             \
2771   develop(bool, VerifyDataPointer, trueInDebug,                             \
2772           "Verify the method data pointer during interpreter profiling")    \
2773                                                                             \
2774   develop(bool, VerifyCompiledCode, false,                                  \
2775           "Include miscellaneous runtime verifications in nmethod code; "   \
2776           "default off because it disturbs nmethod size heuristics")        \
2777                                                                             \
2778   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2779           "Manually make GC thread crash then dump java stack trace;  "     \
2780           "Test only")                                                      \
2781                                                                             \
2782   /* compilation */                                                         \
2783   product(bool, UseCompiler, true,                                          \
2784           "use compilation")                                                \
2785                                                                             \
2786   develop(bool, TraceCompilationPolicy, false,                              \
2787           "Trace compilation policy")                                       \
2788                                                                             \
2789   develop(bool, TimeCompilationPolicy, false,                               \
2790           "Time the compilation policy")                                    \
2791                                                                             \
2792   product(bool, UseCounterDecay, true,                                      \
2793            "adjust recompilation counters")                                 \
2794                                                                             \
2795   develop(intx, CounterHalfLifeTime,    30,                                 \
2796           "half-life time of invocation counters (in secs)")                \
2797                                                                             \
2798   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2799           "Min. ms. between invocation of CounterDecay")                    \
2800                                                                             \
2801   product(bool, AlwaysCompileLoopMethods, false,                            \
2802           "when using recompilation, never interpret methods "              \
2803           "containing loops")                                               \
2804                                                                             \
2805   product(bool, DontCompileHugeMethods, true,                               \
2806           "don't compile methods > HugeMethodLimit")                        \
2807                                                                             \
2808   /* Bytecode escape analysis estimation. */                                \
2809   product(bool, EstimateArgEscape, true,                                    \
2810           "Analyze bytecodes to estimate escape state of arguments")        \
2811                                                                             \
2812   product(intx, BCEATraceLevel, 0,                                          \
2813           "How much tracing to do of bytecode escape analysis estimates")   \
2814                                                                             \
2815   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2816           "Maximum number of nested calls that are analyzed by BC EA.")     \
2817                                                                             \
2818   product(intx, MaxBCEAEstimateSize, 150,                                   \
2819           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2820                                                                             \
2821   product(intx,  AllocatePrefetchStyle, 1,                                  \
2822           "0 = no prefetch, "                                               \
2823           "1 = prefetch instructions for each allocation, "                 \
2824           "2 = use TLAB watermark to gate allocation prefetch, "            \
2825           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2826                                                                             \
2827   product(intx,  AllocatePrefetchDistance, -1,                              \
2828           "Distance to prefetch ahead of allocation pointer")               \
2829                                                                             \
2830   product(intx,  AllocatePrefetchLines, 3,                                  \
2831           "Number of lines to prefetch ahead of array allocation pointer")  \
2832                                                                             \
2833   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2834           "Number of lines to prefetch ahead of instance allocation pointer") \
2835                                                                             \
2836   product(intx,  AllocatePrefetchStepSize, 16,                              \
2837           "Step size in bytes of sequential prefetch instructions")         \
2838                                                                             \
2839   product(intx,  AllocatePrefetchInstr, 0,                                  \
2840           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2841                                                                             \
2842   /* deoptimization */                                                      \
2843   develop(bool, TraceDeoptimization, false,                                 \
2844           "Trace deoptimization")                                           \
2845                                                                             \
2846   develop(bool, DebugDeoptimization, false,                                 \
2847           "Tracing various information while debugging deoptimization")     \
2848                                                                             \
2849   product(intx, SelfDestructTimer, 0,                                       \
2850           "Will cause VM to terminate after a given time (in minutes) "     \
2851           "(0 means off)")                                                  \
2852                                                                             \
2853   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2854           "Max. no. of lines in the stack trace for Java exceptions "       \
2855           "(0 means all)")                                                  \
2856                                                                             \
2857   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2858           "Guarantee a safepoint (at least) every so many milliseconds "    \
2859           "(0 means none)"))                                                \
2860                                                                             \
2861   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2862           "Guarantee a safepoint (at least) every so many milliseconds "    \
2863           "(0 means none)"))                                                \
2864                                                                             \
2865   product(intx, SafepointTimeoutDelay, 10000,                               \
2866           "Delay in milliseconds for option SafepointTimeout")              \
2867                                                                             \
2868   product(intx, NmethodSweepFraction, 16,                                   \
2869           "Number of invocations of sweeper to cover all nmethods")         \
2870                                                                             \
2871   product(intx, NmethodSweepCheckInterval, 5,                               \
2872           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2873                                                                             \
2874   product(intx, NmethodSweepActivity, 10,                                   \
2875           "Removes cold nmethods from code cache if > 0. Higher values "    \
2876           "result in more aggressive sweeping")                             \
2877                                                                             \
2878   notproduct(bool, LogSweeper, false,                                       \
2879             "Keep a ring buffer of sweeper activity")                       \
2880                                                                             \
2881   notproduct(intx, SweeperLogEntries, 1024,                                 \
2882             "Number of records in the ring buffer of sweeper activity")     \
2883                                                                             \
2884   notproduct(intx, MemProfilingInterval, 500,                               \
2885           "Time between each invocation of the MemProfiler")                \
2886                                                                             \
2887   develop(intx, MallocCatchPtr, -1,                                         \
2888           "Hit breakpoint when mallocing/freeing this pointer")             \
2889                                                                             \
2890   notproduct(intx, AssertRepeat, 1,                                         \
2891           "number of times to evaluate expression in assert "               \
2892           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2893                                                                             \
2894   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2895           "List of assertions (file:line) to muzzle")                       \
2896                                                                             \
2897   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2898           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2899           "is used")                                                        \
2900                                                                             \
2901   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2902           "Threshold for total handle allocation when "                     \
2903           "+TraceHandleAllocation is used")                                 \
2904                                                                             \
2905   develop(intx, StackPrintLimit, 100,                                       \
2906           "number of stack frames to print in VM-level stack dump")         \
2907                                                                             \
2908   notproduct(intx, MaxElementPrintSize, 256,                                \
2909           "maximum number of elements to print")                            \
2910                                                                             \
2911   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2912           "maximum number of subklasses to print when printing klass")      \
2913                                                                             \
2914   product(intx, MaxInlineLevel, 9,                                          \
2915           "maximum number of nested calls that are inlined")                \
2916                                                                             \
2917   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2918           "maximum number of nested recursive calls that are inlined")      \
2919                                                                             \
2920   product_pd(intx, InlineSmallCode,                                         \
2921           "Only inline already compiled methods if their code size is "     \
2922           "less than this")                                                 \
2923                                                                             \
2924   product(intx, MaxInlineSize, 35,                                          \
2925           "maximum bytecode size of a method to be inlined")                \
2926                                                                             \
2927   product_pd(intx, FreqInlineSize,                                          \
2928           "maximum bytecode size of a frequent method to be inlined")       \
2929                                                                             \
2930   product(intx, MaxTrivialSize, 6,                                          \
2931           "maximum bytecode size of a trivial method to be inlined")        \
2932                                                                             \
2933   product(intx, MinInliningThreshold, 250,                                  \
2934           "min. invocation count a method needs to have to be inlined")     \
2935                                                                             \
2936   develop(intx, MethodHistogramCutoff, 100,                                 \
2937           "cutoff value for method invoc. histogram (+CountCalls)")         \
2938                                                                             \
2939   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2940           "# of interpreted methods to show in profile")                    \
2941                                                                             \
2942   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2943           "# of compiled methods to show in profile")                       \
2944                                                                             \
2945   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2946           "# of stub methods to show in profile")                           \
2947                                                                             \
2948   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2949           "# of runtime stub nodes to show in profile")                     \
2950                                                                             \
2951   product(intx, ProfileIntervalsTicks, 100,                                 \
2952           "# of ticks between printing of interval profile "                \
2953           "(+ProfileIntervals)")                                            \
2954                                                                             \
2955   notproduct(intx, ScavengeALotInterval,     1,                             \
2956           "Interval between which scavenge will occur with +ScavengeALot")  \
2957                                                                             \
2958   notproduct(intx, FullGCALotInterval,     1,                               \
2959           "Interval between which full gc will occur with +FullGCALot")     \
2960                                                                             \
2961   notproduct(intx, FullGCALotStart,     0,                                  \
2962           "For which invocation to start FullGCAlot")                       \
2963                                                                             \
2964   notproduct(intx, FullGCALotDummies,  32*K,                                \
2965           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2966           "to move")                                                        \
2967                                                                             \
2968   develop(intx, DontYieldALotInterval,    10,                               \
2969           "Interval between which yields will be dropped (milliseconds)")   \
2970                                                                             \
2971   develop(intx, MinSleepInterval,     1,                                    \
2972           "Minimum sleep() interval (milliseconds) when "                   \
2973           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2974                                                                             \
2975   develop(intx, ProfilerPCTickThreshold,    15,                             \
2976           "Number of ticks in a PC buckets to be a hotspot")                \
2977                                                                             \
2978   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2979           "Number of exits until DeoptimizeALot kicks in")                  \
2980                                                                             \
2981   notproduct(intx, ZombieALotInterval,     5,                               \
2982           "Number of exits until ZombieALot kicks in")                      \
2983                                                                             \
2984   develop(bool, StressNonEntrant, false,                                    \
2985           "Mark nmethods non-entrant at registration")                      \
2986                                                                             \
2987   diagnostic(intx, MallocVerifyInterval,     0,                             \
2988           "if non-zero, verify C heap after every N calls to "              \
2989           "malloc/realloc/free")                                            \
2990                                                                             \
2991   diagnostic(intx, MallocVerifyStart,     0,                                \
2992           "if non-zero, start verifying C heap after Nth call to "          \
2993           "malloc/realloc/free")                                            \
2994                                                                             \
2995   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2996           "if non-zero, max # of Words that malloc/realloc can allocate "   \
2997           "(for testing only)")                                             \
2998                                                                             \
2999   product(intx, TypeProfileWidth,     2,                                    \
3000           "number of receiver types to record in call/cast profile")        \
3001                                                                             \
3002   develop(intx, BciProfileWidth,      2,                                    \
3003           "number of return bci's to record in ret profile")                \
3004                                                                             \
3005   product(intx, PerMethodRecompilationCutoff, 400,                          \
3006           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3007                                                                             \
3008   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3009           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3010                                                                             \
3011   product(intx, PerMethodTrapLimit,  100,                                   \
3012           "Limit on traps (of one kind) in a method (includes inlines)")    \
3013                                                                             \
3014   product(intx, PerBytecodeTrapLimit,  4,                                   \
3015           "Limit on traps (of one kind) at a particular BCI")               \
3016                                                                             \
3017   develop(intx, InlineFrequencyRatio,    20,                                \
3018           "Ratio of call site execution to caller method invocation")       \
3019                                                                             \
3020   develop_pd(intx, InlineFrequencyCount,                                    \
3021           "Count of call site execution necessary to trigger frequent "     \
3022           "inlining")                                                       \
3023                                                                             \
3024   develop(intx, InlineThrowCount,    50,                                    \
3025           "Force inlining of interpreted methods that throw this often")    \
3026                                                                             \
3027   develop(intx, InlineThrowMaxSize,   200,                                  \
3028           "Force inlining of throwing methods smaller than this")           \
3029                                                                             \
3030   develop(intx, ProfilerNodeSize,  1024,                                    \
3031           "Size in K to allocate for the Profile Nodes of each thread")     \
3032                                                                             \
3033   product_pd(intx, PreInflateSpin,                                          \
3034           "Number of times to spin wait before inflation")                  \
3035                                                                             \
3036   /* gc parameters */                                                       \
3037   product(uintx, InitialHeapSize, 0,                                        \
3038           "Initial heap size (in bytes); zero means use ergonomics")        \
3039                                                                             \
3040   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3041           "Maximum heap size (in bytes)")                                   \
3042                                                                             \
3043   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3044           "Initial tenured generation size (in bytes)")                     \
3045                                                                             \
3046   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3047           "Initial new generation size (in bytes)")                         \
3048                                                                             \
3049   product(uintx, MaxNewSize, max_uintx,                                     \
3050           "Maximum new generation size (in bytes), max_uintx means set "    \
3051           "ergonomically")                                                  \
3052                                                                             \
3053   product(uintx, PretenureSizeThreshold, 0,                                 \
3054           "Maximum size in bytes of objects allocated in DefNew "           \
3055           "generation; zero means no maximum")                              \
3056                                                                             \
3057   product(uintx, TLABSize, 0,                                               \
3058           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3059                                                                             \
3060   product(uintx, MinTLABSize, 2*K,                                          \
3061           "Minimum allowed TLAB size (in bytes)")                           \
3062                                                                             \
3063   product(uintx, TLABAllocationWeight, 35,                                  \
3064           "Allocation averaging weight")                                    \
3065                                                                             \
3066   product(uintx, TLABWasteTargetPercent, 1,                                 \
3067           "Percentage of Eden that can be wasted")                          \
3068                                                                             \
3069   product(uintx, TLABRefillWasteFraction,    64,                            \
3070           "Max TLAB waste at a refill (internal fragmentation)")            \
3071                                                                             \
3072   product(uintx, TLABWasteIncrement,    4,                                  \
3073           "Increment allowed waste at slow allocation")                     \
3074                                                                             \
3075   product(uintx, SurvivorRatio, 8,                                          \
3076           "Ratio of eden/survivor space size")                              \
3077                                                                             \
3078   product(uintx, NewRatio, 2,                                               \
3079           "Ratio of new/old generation sizes")                              \
3080                                                                             \
3081   product_pd(uintx, NewSizeThreadIncrease,                                  \
3082           "Additional size added to desired new generation size per "       \
3083           "non-daemon thread (in bytes)")                                   \
3084                                                                             \
3085   product_pd(uintx, MetaspaceSize,                                          \
3086           "Initial size of Metaspaces (in bytes)")                          \
3087                                                                             \
3088   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3089           "Maximum size of Metaspaces (in bytes)")                          \
3090                                                                             \
3091   product(uintx, CompressedClassSpaceSize, 1*G,                             \
3092           "Maximum size of class area in Metaspace when compressed "        \
3093           "class pointers are used")                                        \
3094                                                                             \
3095   product(uintx, MinHeapFreeRatio,    40,                                   \
3096           "Min percentage of heap free after GC to avoid expansion")        \
3097                                                                             \
3098   product(uintx, MaxHeapFreeRatio,    70,                                   \
3099           "Max percentage of heap free after GC to avoid shrinking")        \
3100                                                                             \
3101   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3102           "Number of milliseconds per MB of free space in the heap")        \
3103                                                                             \
3104   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3105           "Min change in heap space due to GC (in bytes)")                  \
3106                                                                             \
3107   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3108           "Min expansion of Metaspace (in bytes)")                          \
3109                                                                             \
3110   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3111           "Min percentage of Metaspace free after GC to avoid expansion")   \
3112                                                                             \
3113   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3114           "Max percentage of Metaspace free after GC to avoid shrinking")   \
3115                                                                             \
3116   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3117           "Max expansion of Metaspace without full GC (in bytes)")          \
3118                                                                             \
3119   product(uintx, QueuedAllocationWarningCount, 0,                           \
3120           "Number of times an allocation that queues behind a GC "          \
3121           "will retry before printing a warning")                           \
3122                                                                             \
3123   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3124           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3125                                                                             \
3126   diagnostic(intx, VerifyGCLevel,     0,                                    \
3127           "Generation level at which to start +VerifyBefore/AfterGC")       \
3128                                                                             \
3129   product(uintx, MaxTenuringThreshold,    15,                               \
3130           "Maximum value for tenuring threshold")                           \
3131                                                                             \
3132   product(uintx, InitialTenuringThreshold,    7,                            \
3133           "Initial value for tenuring threshold")                           \
3134                                                                             \
3135   product(uintx, TargetSurvivorRatio,    50,                                \
3136           "Desired percentage of survivor space used after scavenge")       \
3137                                                                             \
3138   product(uintx, MarkSweepDeadRatio,     5,                                 \
3139           "Percentage (0-100) of the old gen allowed as dead wood."         \
3140           "Serial mark sweep treats this as both the min and max value."    \
3141           "CMS uses this value only if it falls back to mark sweep."        \
3142           "Par compact uses a variable scale based on the density of the"   \
3143           "generation and treats this as the max value when the heap is"    \
3144           "either completely full or completely empty.  Par compact also"   \
3145           "has a smaller default value; see arguments.cpp.")                \
3146                                                                             \
3147   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3148           "How often should we fully compact the heap (ignoring the dead "  \
3149           "space parameters)")                                              \
3150                                                                             \
3151   product(intx, PrintCMSStatistics, 0,                                      \
3152           "Statistics for CMS")                                             \
3153                                                                             \
3154   product(bool, PrintCMSInitiationStatistics, false,                        \
3155           "Statistics for initiating a CMS collection")                     \
3156                                                                             \
3157   product(intx, PrintFLSStatistics, 0,                                      \
3158           "Statistics for CMS' FreeListSpace")                              \
3159                                                                             \
3160   product(intx, PrintFLSCensus, 0,                                          \
3161           "Census for CMS' FreeListSpace")                                  \
3162                                                                             \
3163   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3164           "Delay in ms between expansion and allocation")                   \
3165                                                                             \
3166   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3167           "Delay in ms in scheduling GC workers")                           \
3168                                                                             \
3169   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3170           "(Unstable) Number of times to iterate in safepoint loop "        \
3171           " before blocking VM threads ")                                   \
3172                                                                             \
3173   product(intx, DeferPollingPageLoopCount,     -1,                          \
3174           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3175           "before changing safepoint polling page to RO ")                  \
3176                                                                             \
3177   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3178                                                                             \
3179   product(bool, PSChunkLargeArrays, true,                                   \
3180           "true: process large arrays in chunks")                           \
3181                                                                             \
3182   product(uintx, GCDrainStackTargetSize, 64,                                \
3183           "how many entries we'll try to leave on the stack during "        \
3184           "parallel GC")                                                    \
3185                                                                             \
3186   /* stack parameters */                                                    \
3187   product_pd(intx, StackYellowPages,                                        \
3188           "Number of yellow zone (recoverable overflows) pages")            \
3189                                                                             \
3190   product_pd(intx, StackRedPages,                                           \
3191           "Number of red zone (unrecoverable overflows) pages")             \
3192                                                                             \
3193   product_pd(intx, StackShadowPages,                                        \
3194           "Number of shadow zone (for overflow checking) pages"             \
3195           " this should exceed the depth of the VM and native call stack")  \
3196                                                                             \
3197   product_pd(intx, ThreadStackSize,                                         \
3198           "Thread Stack Size (in Kbytes)")                                  \
3199                                                                             \
3200   product_pd(intx, VMThreadStackSize,                                       \
3201           "Non-Java Thread Stack Size (in Kbytes)")                         \
3202                                                                             \
3203   product_pd(intx, CompilerThreadStackSize,                                 \
3204           "Compiler Thread Stack Size (in Kbytes)")                         \
3205                                                                             \
3206   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3207           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3208                                                                             \
3209   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3210           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3211           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3212           "disable this feature")                                           \
3213                                                                             \
3214   /* code cache parameters */                                               \
3215   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3216           "Code cache segment size (in bytes) - smallest unit of "          \
3217           "allocation")                                                     \
3218                                                                             \
3219   develop_pd(intx, CodeEntryAlignment,                                      \
3220           "Code entry alignment for generated code (in bytes)")             \
3221                                                                             \
3222   product_pd(intx, OptoLoopAlignment,                                       \
3223           "Align inner loops to zero relative to this modulus")             \
3224                                                                             \
3225   product_pd(uintx, InitialCodeCacheSize,                                   \
3226           "Initial code cache size (in bytes)")                             \
3227                                                                             \
3228   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3229           "Minimum code cache size (in bytes) required to start VM.")       \
3230                                                                             \
3231   product_pd(uintx, ReservedCodeCacheSize,                                  \
3232           "Reserved code cache size (in bytes) - maximum code cache size")  \






3233                                                                             \
3234   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3235           "When less than X space left, we stop compiling.")                \
3236                                                                             \
3237   product_pd(uintx, CodeCacheExpansionSize,                                 \
3238           "Code cache expansion size (in bytes)")                           \
3239                                                                             \
3240   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3241           "Minimum number of segments in a code cache block.")              \
3242                                                                             \
3243   notproduct(bool, ExitOnFullCodeCache, false,                              \
3244           "Exit the VM if we fill the code cache.")                         \
3245                                                                             \
3246   product(bool, UseCodeCacheFlushing, true,                                 \
3247           "Attempt to clean the code cache before shutting off compiler")   \
3248                                                                             \
3249   /* interpreter debugging */                                               \
3250   develop(intx, BinarySwitchThreshold, 5,                                   \
3251           "Minimal number of lookupswitch entries for rewriting to binary " \
3252           "switch")                                                         \
3253                                                                             \
3254   develop(intx, StopInterpreterAt, 0,                                       \
3255           "Stops interpreter execution at specified bytecode number")       \
3256                                                                             \
3257   develop(intx, TraceBytecodesAt, 0,                                        \
3258           "Traces bytecodes starting with specified bytecode number")       \
3259                                                                             \
3260   /* compiler interface */                                                  \
3261   develop(intx, CIStart, 0,                                                 \
3262           "the id of the first compilation to permit")                      \
3263                                                                             \
3264   develop(intx, CIStop,    -1,                                              \
3265           "the id of the last compilation to permit")                       \
3266                                                                             \
3267   develop(intx, CIStartOSR,     0,                                          \
3268           "the id of the first osr compilation to permit "                  \
3269           "(CICountOSR must be on)")                                        \
3270                                                                             \
3271   develop(intx, CIStopOSR,    -1,                                           \
3272           "the id of the last osr compilation to permit "                   \
3273           "(CICountOSR must be on)")                                        \
3274                                                                             \
3275   develop(intx, CIBreakAtOSR,    -1,                                        \
3276           "id of osr compilation to break at")                              \
3277                                                                             \
3278   develop(intx, CIBreakAt,    -1,                                           \
3279           "id of compilation to break at")                                  \
3280                                                                             \
3281   product(ccstrlist, CompileOnly, "",                                       \
3282           "List of methods (pkg/class.name) to restrict compilation to")    \
3283                                                                             \
3284   product(ccstr, CompileCommandFile, NULL,                                  \
3285           "Read compiler commands from this file [.hotspot_compiler]")      \
3286                                                                             \
3287   product(ccstrlist, CompileCommand, "",                                    \
3288           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3289                                                                             \
3290   develop(bool, ReplayCompiles, false,                                      \
3291           "Enable replay of compilations from ReplayDataFile")              \
3292                                                                             \
3293   product(ccstr, ReplayDataFile, NULL,                                      \
3294           "File containing compilation replay information"                  \
3295           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3296                                                                             \
3297   develop(intx, ReplaySuppressInitializers, 2,                              \
3298           "Controls handling of class initialization during replay"         \
3299           "0 - don't do anything special"                                   \
3300           "1 - treat all class initializers as empty"                       \
3301           "2 - treat class initializers for application classes as empty"   \
3302           "3 - allow all class initializers to run during bootstrap but"    \
3303           "    pretend they are empty after starting replay")               \
3304                                                                             \
3305   develop(bool, ReplayIgnoreInitErrors, false,                              \
3306           "Ignore exceptions thrown during initialization for replay")      \
3307                                                                             \
3308   product(bool, DumpReplayDataOnError, true,                                \
3309           "Record replay data for crashing compiler threads")               \
3310                                                                             \
3311   product(bool, CICompilerCountPerCPU, false,                               \
3312           "1 compiler thread for log(N CPUs)")                              \
3313                                                                             \
3314   develop(intx, CIFireOOMAt,    -1,                                         \
3315           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3316           "(non-negative value throws OOM after this many CI accesses "     \
3317           "in each compile)")                                               \
3318   notproduct(intx, CICrashAt, -1,                                           \
3319           "id of compilation to trigger assert in compiler thread for "     \
3320           "the purpose of testing, e.g. generation of replay data")         \
3321   notproduct(bool, CIObjectFactoryVerify, false,                            \
3322           "enable potentially expensive verification in ciObjectFactory")   \
3323                                                                             \
3324   /* Priorities */                                                          \
3325   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3326                                                                             \
3327   product(intx, ThreadPriorityPolicy, 0,                                    \
3328           "0 : Normal.                                                     "\
3329           "    VM chooses priorities that are appropriate for normal       "\
3330           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3331           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3332           "    map to lower native priority values. On Windows applications"\
3333           "    are allowed to use higher native priorities. However, with  "\
3334           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3335           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3336           "    interfere with system threads. On Linux thread priorities   "\
3337           "    are ignored because the OS does not support static priority "\
3338           "    in SCHED_OTHER scheduling class which is the only choice for"\
3339           "    non-root, non-realtime applications.                        "\
3340           "1 : Aggressive.                                                 "\
3341           "    Java thread priorities map over to the entire range of      "\
3342           "    native thread priorities. Higher Java thread priorities map "\
3343           "    to higher native thread priorities. This policy should be   "\
3344           "    used with care, as sometimes it can cause performance       "\
3345           "    degradation in the application and/or the entire system. On "\
3346           "    Linux this policy requires root privilege.")                 \
3347                                                                             \
3348   product(bool, ThreadPriorityVerbose, false,                               \
3349           "Print priority changes")                                         \
3350                                                                             \
3351   product(intx, DefaultThreadPriority, -1,                                  \
3352           "The native priority at which threads run if not elsewhere "      \
3353           "specified (-1 means no change)")                                 \
3354                                                                             \
3355   product(intx, CompilerThreadPriority, -1,                                 \
3356           "The native priority at which compiler threads should run "       \
3357           "(-1 means no change)")                                           \
3358                                                                             \
3359   product(intx, VMThreadPriority, -1,                                       \
3360           "The native priority at which the VM thread should run "          \
3361           "(-1 means no change)")                                           \
3362                                                                             \
3363   product(bool, CompilerThreadHintNoPreempt, true,                          \
3364           "(Solaris only) Give compiler threads an extra quanta")           \
3365                                                                             \
3366   product(bool, VMThreadHintNoPreempt, false,                               \
3367           "(Solaris only) Give VM thread an extra quanta")                  \
3368                                                                             \
3369   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3370   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3371   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3372   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3373   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3374   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3375   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3376   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3377   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3378   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3379                                                                             \
3380   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3381           "Java thread priority 10 maps to critical scheduling priority")   \
3382                                                                             \
3383   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3384           "Compiler thread(s) run at critical scheduling priority")         \
3385                                                                             \
3386   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3387           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3388                                                                             \
3389   /* compiler debugging */                                                  \
3390   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3391           "First class to consider when using +CompileTheWorld")            \
3392                                                                             \
3393   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3394           "Last class to consider when using +CompileTheWorld")             \
3395                                                                             \
3396   develop(intx, NewCodeParameter,      0,                                   \
3397           "Testing Only: Create a dedicated integer parameter before "      \
3398           "putback")                                                        \
3399                                                                             \
3400   /* new oopmap storage allocation */                                       \
3401   develop(intx, MinOopMapAllocation,     8,                                 \
3402           "Minimum number of OopMap entries in an OopMapSet")               \
3403                                                                             \
3404   /* Background Compilation */                                              \
3405   develop(intx, LongCompileThreshold,     50,                               \
3406           "Used with +TraceLongCompiles")                                   \
3407                                                                             \
3408   product(intx, StarvationMonitorInterval,    200,                          \
3409           "Pause between each check in ms")                                 \
3410                                                                             \
3411   /* recompilation */                                                       \
3412   product_pd(intx, CompileThreshold,                                        \
3413           "number of interpreted method invocations before (re-)compiling") \
3414                                                                             \
3415   product_pd(intx, BackEdgeThreshold,                                       \
3416           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3417                                                                             \
3418   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3419           "Interpreter (tier 0) invocation notification frequency.")        \
3420                                                                             \
3421   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3422           "C1 without MDO (tier 2) invocation notification frequency.")     \
3423                                                                             \
3424   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3425           "C1 with MDO profiling (tier 3) invocation notification "         \
3426           "frequency.")                                                     \
3427                                                                             \
3428   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3429           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3430                                                                             \
3431   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3432           "Interpreter (tier 0) invocation notification frequency.")        \
3433                                                                             \
3434   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3435           "C1 without MDO (tier 2) invocation notification frequency.")     \
3436                                                                             \
3437   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3438           "C1 with MDO profiling (tier 3) invocation notification "         \
3439           "frequency.")                                                     \
3440                                                                             \
3441   product(intx, Tier2CompileThreshold, 0,                                   \
3442           "threshold at which tier 2 compilation is invoked")               \
3443                                                                             \
3444   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3445           "Back edge threshold at which tier 2 compilation is invoked")     \
3446                                                                             \
3447   product(intx, Tier3InvocationThreshold, 200,                              \
3448           "Compile if number of method invocations crosses this "           \
3449           "threshold")                                                      \
3450                                                                             \
3451   product(intx, Tier3MinInvocationThreshold, 100,                           \
3452           "Minimum invocation to compile at tier 3")                        \
3453                                                                             \
3454   product(intx, Tier3CompileThreshold, 2000,                                \
3455           "Threshold at which tier 3 compilation is invoked (invocation "   \
3456           "minimum must be satisfied.")                                     \
3457                                                                             \
3458   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3459           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3460                                                                             \
3461   product(intx, Tier4InvocationThreshold, 5000,                             \
3462           "Compile if number of method invocations crosses this "           \
3463           "threshold")                                                      \
3464                                                                             \
3465   product(intx, Tier4MinInvocationThreshold, 600,                           \
3466           "Minimum invocation to compile at tier 4")                        \
3467                                                                             \
3468   product(intx, Tier4CompileThreshold, 15000,                               \
3469           "Threshold at which tier 4 compilation is invoked (invocation "   \
3470           "minimum must be satisfied.")                                     \
3471                                                                             \
3472   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3473           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3474                                                                             \
3475   product(intx, Tier3DelayOn, 5,                                            \
3476           "If C2 queue size grows over this amount per compiler thread "    \
3477           "stop compiling at tier 3 and start compiling at tier 2")         \
3478                                                                             \
3479   product(intx, Tier3DelayOff, 2,                                           \
3480           "If C2 queue size is less than this amount per compiler thread "  \
3481           "allow methods compiled at tier 2 transition to tier 3")          \
3482                                                                             \
3483   product(intx, Tier3LoadFeedback, 5,                                       \
3484           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3485           "reaches this amount per compiler thread")                        \
3486                                                                             \
3487   product(intx, Tier4LoadFeedback, 3,                                       \
3488           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3489           "reaches this amount per compiler thread")                        \
3490                                                                             \
3491   product(intx, TieredCompileTaskTimeout, 50,                               \
3492           "Kill compile task if method was not used within "                \
3493           "given timeout in milliseconds")                                  \
3494                                                                             \
3495   product(intx, TieredStopAtLevel, 4,                                       \
3496           "Stop at given compilation level")                                \
3497                                                                             \
3498   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3499           "Start profiling in interpreter if the counters exceed tier 3"    \
3500           "thresholds by the specified percentage")                         \
3501                                                                             \
3502   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3503           "Increase the compile threshold for C1 compilation if the code"   \
3504           "cache is filled by the specified percentage.")                   \
3505                                                                             \
3506   product(intx, TieredRateUpdateMinTime, 1,                                 \
3507           "Minimum rate sampling interval (in milliseconds)")               \
3508                                                                             \
3509   product(intx, TieredRateUpdateMaxTime, 25,                                \
3510           "Maximum rate sampling interval (in milliseconds)")               \
3511                                                                             \
3512   product_pd(bool, TieredCompilation,                                       \
3513           "Enable tiered compilation")                                      \
3514                                                                             \
3515   product(bool, PrintTieredEvents, false,                                   \
3516           "Print tiered events notifications")                              \
3517                                                                             \
3518   product_pd(intx, OnStackReplacePercentage,                                \
3519           "NON_TIERED number of method invocations/branches (expressed as %"\
3520           "of CompileThreshold) before (re-)compiling OSR code")            \
3521                                                                             \
3522   product(intx, InterpreterProfilePercentage, 33,                           \
3523           "NON_TIERED number of method invocations/branches (expressed as %"\
3524           "of CompileThreshold) before profiling in the interpreter")       \
3525                                                                             \
3526   develop(intx, MaxRecompilationSearchLength,    10,                        \
3527           "max. # frames to inspect searching for recompilee")              \
3528                                                                             \
3529   develop(intx, MaxInterpretedSearchLength,     3,                          \
3530           "max. # interp. frames to skip when searching for recompilee")    \
3531                                                                             \
3532   develop(intx, DesiredMethodLimit,  8000,                                  \
3533           "desired max. method size (in bytecodes) after inlining")         \
3534                                                                             \
3535   develop(intx, HugeMethodLimit,  8000,                                     \
3536           "don't compile methods larger than this if "                      \
3537           "+DontCompileHugeMethods")                                        \
3538                                                                             \
3539   /* New JDK 1.4 reflection implementation */                               \
3540                                                                             \
3541   develop(bool, UseNewReflection, true,                                     \
3542           "Temporary flag for transition to reflection based on dynamic "   \
3543           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3544           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3545           "changes were needed")                                            \
3546                                                                             \
3547   develop(bool, VerifyReflectionBytecodes, false,                           \
3548           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3549           "in situations like that described in 4486457 or for "            \
3550           "constructors generated for serialization, so can not be enabled "\
3551           "in product.")                                                    \
3552                                                                             \
3553   product(bool, ReflectionWrapResolutionErrors, true,                       \
3554           "Temporary flag for transition to AbstractMethodError wrapped "   \
3555           "in InvocationTargetException. See 6531596")                      \
3556                                                                             \
3557   develop(bool, VerifyLambdaBytecodes, false,                               \
3558           "Force verification of jdk 8 lambda metafactory bytecodes.")      \
3559                                                                             \
3560   develop(intx, FastSuperclassLimit, 8,                                     \
3561           "Depth of hardwired instanceof accelerator array")                \
3562                                                                             \
3563   /* Properties for Java libraries  */                                      \
3564                                                                             \
3565   product(uintx, MaxDirectMemorySize, 0,                                    \
3566           "Maximum total size of NIO direct-buffer allocations")            \
3567                                                                             \
3568   /* temporary developer defined flags  */                                  \
3569                                                                             \
3570   diagnostic(bool, UseNewCode, false,                                       \
3571           "Testing Only: Use the new version while testing")                \
3572                                                                             \
3573   diagnostic(bool, UseNewCode2, false,                                      \
3574           "Testing Only: Use the new version while testing")                \
3575                                                                             \
3576   diagnostic(bool, UseNewCode3, false,                                      \
3577           "Testing Only: Use the new version while testing")                \
3578                                                                             \
3579   /* flags for performance data collection */                               \
3580                                                                             \
3581   product(bool, UsePerfData, falseInEmbedded,                               \
3582           "Flag to disable jvmstat instrumentation for performance testing" \
3583           "and problem isolation purposes.")                                \
3584                                                                             \
3585   product(bool, PerfDataSaveToFile, false,                                  \
3586           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3587                                                                             \
3588   product(ccstr, PerfDataSaveFile, NULL,                                    \
3589           "Save PerfData memory to the specified absolute pathname,"        \
3590            "%p in the file name if present will be replaced by pid")        \
3591                                                                             \
3592   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3593           "Data sampling interval in milliseconds")                         \
3594                                                                             \
3595   develop(bool, PerfTraceDataCreation, false,                               \
3596           "Trace creation of Performance Data Entries")                     \
3597                                                                             \
3598   develop(bool, PerfTraceMemOps, false,                                     \
3599           "Trace PerfMemory create/attach/detach calls")                    \
3600                                                                             \
3601   product(bool, PerfDisableSharedMem, false,                                \
3602           "Store performance data in standard memory")                      \
3603                                                                             \
3604   product(intx, PerfDataMemorySize, 32*K,                                   \
3605           "Size of performance data memory region. Will be rounded "        \
3606           "up to a multiple of the native os page size.")                   \
3607                                                                             \
3608   product(intx, PerfMaxStringConstLength, 1024,                             \
3609           "Maximum PerfStringConstant string length before truncation")     \
3610                                                                             \
3611   product(bool, PerfAllowAtExitRegistration, false,                         \
3612           "Allow registration of atexit() methods")                         \
3613                                                                             \
3614   product(bool, PerfBypassFileSystemCheck, false,                           \
3615           "Bypass Win32 file system criteria checks (Windows Only)")        \
3616                                                                             \
3617   product(intx, UnguardOnExecutionViolation, 0,                             \
3618           "Unguard page and retry on no-execute fault (Win32 only)"         \
3619           "0=off, 1=conservative, 2=aggressive")                            \
3620                                                                             \
3621   /* Serviceability Support */                                              \
3622                                                                             \
3623   product(bool, ManagementServer, false,                                    \
3624           "Create JMX Management Server")                                   \
3625                                                                             \
3626   product(bool, DisableAttachMechanism, false,                              \
3627          "Disable mechanism that allows tools to attach to this VM")        \
3628                                                                             \
3629   product(bool, StartAttachListener, false,                                 \
3630           "Always start Attach Listener at VM startup")                     \
3631                                                                             \
3632   manageable(bool, PrintConcurrentLocks, false,                             \
3633           "Print java.util.concurrent locks in thread dump")                \
3634                                                                             \
3635   product(bool, TransmitErrorReport, false,                                 \
3636           "Enable error report transmission on erroneous termination")      \
3637                                                                             \
3638   product(ccstr, ErrorReportServer, NULL,                                   \
3639           "Override built-in error report server address")                  \
3640                                                                             \
3641   /* Shared spaces */                                                       \
3642                                                                             \
3643   product(bool, UseSharedSpaces, true,                                      \
3644           "Use shared spaces for metadata")                                 \
3645                                                                             \
3646   product(bool, RequireSharedSpaces, false,                                 \
3647           "Require shared spaces for metadata")                             \
3648                                                                             \
3649   product(bool, DumpSharedSpaces, false,                                    \
3650            "Special mode: JVM reads a class list, loads classes, builds "   \
3651             "shared spaces, and dumps the shared spaces to a file to be "   \
3652             "used in future JVM runs.")                                     \
3653                                                                             \
3654   product(bool, PrintSharedSpaces, false,                                   \
3655           "Print usage of shared spaces")                                   \
3656                                                                             \
3657   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3658           "Size of read-write space for metadata (in bytes)")               \
3659                                                                             \
3660   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3661           "Size of read-only space for metadata (in bytes)")                \
3662                                                                             \
3663   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3664           "Size of the shared miscellaneous data area (in bytes)")          \
3665                                                                             \
3666   product(uintx, SharedMiscCodeSize,    120*K,                              \
3667           "Size of the shared miscellaneous code area (in bytes)")          \
3668                                                                             \
3669   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3670           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3671           "Address to allocate shared memory region for class data")        \
3672                                                                             \
3673   diagnostic(bool, EnableInvokeDynamic, true,                               \
3674           "support JSR 292 (method handles, invokedynamic, "                \
3675           "anonymous classes")                                              \
3676                                                                             \
3677   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3678           "Print generated stub code for method handles")                   \
3679                                                                             \
3680   develop(bool, TraceMethodHandles, false,                                  \
3681           "trace internal method handle operations")                        \
3682                                                                             \
3683   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3684           "perform extra checks when constructing method handles")          \
3685                                                                             \
3686   diagnostic(bool, ShowHiddenFrames, false,                                 \
3687           "show method handle implementation frames (usually hidden)")      \
3688                                                                             \
3689   experimental(bool, TrustFinalNonStaticFields, false,                      \
3690           "trust final non-static declarations for constant folding")       \
3691                                                                             \
3692   experimental(bool, FoldStableValues, false,                               \
3693           "Private flag to control optimizations for stable variables")     \
3694                                                                             \
3695   develop(bool, TraceInvokeDynamic, false,                                  \
3696           "trace internal invoke dynamic operations")                       \
3697                                                                             \
3698   diagnostic(bool, PauseAtStartup,      false,                              \
3699           "Causes the VM to pause at startup time and wait for the pause "  \
3700           "file to be removed (default: ./vm.paused.<pid>)")                \
3701                                                                             \
3702   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3703           "The file to create and for whose removal to await when pausing " \
3704           "at startup. (default: ./vm.paused.<pid>)")                       \
3705                                                                             \
3706   diagnostic(bool, PauseAtExit, false,                                      \
3707           "Pause and wait for keypress on exit if a debugger is attached")  \
3708                                                                             \
3709   product(bool, ExtendedDTraceProbes,    false,                             \
3710           "Enable performance-impacting dtrace probes")                     \
3711                                                                             \
3712   product(bool, DTraceMethodProbes, false,                                  \
3713           "Enable dtrace probes for method-entry and method-exit")          \
3714                                                                             \
3715   product(bool, DTraceAllocProbes, false,                                   \
3716           "Enable dtrace probes for object allocation")                     \
3717                                                                             \
3718   product(bool, DTraceMonitorProbes, false,                                 \
3719           "Enable dtrace probes for monitor events")                        \
3720                                                                             \
3721   product(bool, RelaxAccessControlCheck, false,                             \
3722           "Relax the access control checks in the verifier")                \
3723                                                                             \
3724   diagnostic(bool, PrintDTraceDOF, false,                                   \
3725              "Print the DTrace DOF passed to the system for JSDT probes")   \
3726                                                                             \
3727   product(uintx, StringTableSize, defaultStringTableSize,                   \
3728           "Number of buckets in the interned String table")                 \
3729                                                                             \
3730   develop(bool, TraceDefaultMethods, false,                                 \
3731           "Trace the default method processing steps")                      \
3732                                                                             \
3733   develop(bool, VerifyGenericSignatures, false,                             \
3734           "Abort VM on erroneous or inconsistent generic signatures")       \
3735                                                                             \
3736   product(bool, UseVMInterruptibleIO, false,                                \
3737           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3738           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3739           " of this flag is true for JDK 6 and earlier")                    \
3740                                                                             \
3741   diagnostic(bool, WhiteBoxAPI, false,                                      \
3742           "Enable internal testing APIs")                                   \
3743                                                                             \
3744   product(bool, PrintGCCause, true,                                         \
3745           "Include GC cause in GC logging")                                 \
3746                                                                             \
3747   product(bool , AllowNonVirtualCalls, false,                               \
3748           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3749                                                                             \
3750   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3751           "Override the default location of the CDS archive file")          \
3752                                                                             \
3753   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3754           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3755           "Allocation less than this value will be allocated "              \
3756           "using malloc. Larger allocations will use mmap.")                \
3757                                                                             \
3758   product(bool, EnableTracing, false,                                       \
3759           "Enable event-based tracing")                                     \
3760   product(bool, UseLockedTracing, false,                                    \
3761           "Use locked-tracing when doing event-based tracing")
3762 
3763 
3764 /*
3765  *  Macros for factoring of globals
3766  */
3767 
3768 // Interface macros
3769 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
3770 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
3771 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
3772 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3773 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
3774 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
3775 #ifdef PRODUCT
3776 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
3777 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
3778 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
3779 #else
3780 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
3781 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
3782 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
3783 #endif
3784 // Special LP64 flags, product only needed for now.
3785 #ifdef _LP64
3786 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3787 #else
3788 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3789 #endif // _LP64
3790 
3791 // Implementation macros
3792 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
3793 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
3794 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
3795 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3796 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
3797 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
3798 #ifdef PRODUCT
3799 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
3800 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
3801 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
3802 #else
3803 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
3804 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
3805 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
3806 #endif
3807 #ifdef _LP64
3808 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3809 #else
3810 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3811 #endif // _LP64
3812 
3813 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)
3814 
3815 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3816 
3817 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3818 
3819 // Extensions
3820 
3821 #include "runtime/globals_ext.hpp"
3822 
3823 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---