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, ProfiledCodeHeapSize,         11*M);
 177 define_pd_global(intx, NonProfiledCodeHeapSize,      21*M);
 178 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 179 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 180 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 181 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 182 define_pd_global(bool, NeverActAsServerClassMachine, true);
 183 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 184 #define CI_COMPILER_COUNT 0
 185 #else
 186 
 187 #ifdef COMPILER2
 188 #define CI_COMPILER_COUNT 2
 189 #else
 190 #define CI_COMPILER_COUNT 1
 191 #endif // COMPILER2
 192 
 193 #endif // no compilers
 194 
 195 // string type aliases used only in this file
 196 typedef const char* ccstr;
 197 typedef const char* ccstrlist;   // represents string arguments which accumulate
 198 
 199 struct Flag {
 200   enum Flags {
 201     // value origin
 202     DEFAULT          = 0,
 203     COMMAND_LINE     = 1,
 204     ENVIRON_VAR      = 2,
 205     CONFIG_FILE      = 3,
 206     MANAGEMENT       = 4,
 207     ERGONOMIC        = 5,
 208     ATTACH_ON_DEMAND = 6,
 209     INTERNAL         = 7,
 210 
 211     LAST_VALUE_ORIGIN = INTERNAL,
 212     VALUE_ORIGIN_BITS = 4,
 213     VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS),
 214 
 215     // flag kind
 216     KIND_PRODUCT            = 1 << 4,
 217     KIND_MANAGEABLE         = 1 << 5,
 218     KIND_DIAGNOSTIC         = 1 << 6,
 219     KIND_EXPERIMENTAL       = 1 << 7,
 220     KIND_NOT_PRODUCT        = 1 << 8,
 221     KIND_DEVELOP            = 1 << 9,
 222     KIND_PLATFORM_DEPENDENT = 1 << 10,
 223     KIND_READ_WRITE         = 1 << 11,
 224     KIND_C1                 = 1 << 12,
 225     KIND_C2                 = 1 << 13,
 226     KIND_ARCH               = 1 << 14,
 227     KIND_SHARK              = 1 << 15,
 228     KIND_LP64_PRODUCT       = 1 << 16,
 229     KIND_COMMERCIAL         = 1 << 17,
 230 
 231     KIND_MASK = ~VALUE_ORIGIN_MASK
 232   };
 233 
 234   const char* _type;
 235   const char* _name;
 236   void* _addr;
 237   NOT_PRODUCT(const char* _doc;)
 238   Flags _flags;
 239 
 240   // points to all Flags static array
 241   static Flag* flags;
 242 
 243   // number of flags
 244   static size_t numFlags;
 245 
 246   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
 247   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 248 
 249   void check_writable();
 250 
 251   bool is_bool() const;
 252   bool get_bool() const;
 253   void set_bool(bool value);
 254 
 255   bool is_intx() const;
 256   intx get_intx() const;
 257   void set_intx(intx value);
 258 
 259   bool is_uintx() const;
 260   uintx get_uintx() const;
 261   void set_uintx(uintx value);
 262 
 263   bool is_uint64_t() const;
 264   uint64_t get_uint64_t() const;
 265   void set_uint64_t(uint64_t value);
 266 
 267   bool is_double() const;
 268   double get_double() const;
 269   void set_double(double value);
 270 
 271   bool is_ccstr() const;
 272   bool ccstr_accumulates() const;
 273   ccstr get_ccstr() const;
 274   void set_ccstr(ccstr value);
 275 
 276   Flags get_origin();
 277   void set_origin(Flags origin);
 278 
 279   bool is_default();
 280   bool is_ergonomic();
 281   bool is_command_line();
 282 
 283   bool is_product() const;
 284   bool is_manageable() const;
 285   bool is_diagnostic() const;
 286   bool is_experimental() const;
 287   bool is_notproduct() const;
 288   bool is_develop() const;
 289   bool is_read_write() const;
 290   bool is_commercial() const;
 291 
 292   bool is_constant_in_binary() const;
 293 
 294   bool is_unlocker() const;
 295   bool is_unlocked() const;
 296   bool is_writeable() const;
 297   bool is_external() const;
 298 
 299   bool is_unlocker_ext() const;
 300   bool is_unlocked_ext() const;
 301   bool is_writeable_ext() const;
 302   bool is_external_ext() const;
 303 
 304   void get_locked_message(char*, int) const;
 305   void get_locked_message_ext(char*, int) const;
 306 
 307   void print_on(outputStream* st, bool withComments = false );
 308   void print_kind(outputStream* st);
 309   void print_as_flag(outputStream* st);
 310 };
 311 
 312 // debug flags control various aspects of the VM and are global accessible
 313 
 314 // use FlagSetting to temporarily change some debug flag
 315 // e.g. FlagSetting fs(DebugThisAndThat, true);
 316 // restored to previous value upon leaving scope
 317 class FlagSetting {
 318   bool val;
 319   bool* flag;
 320  public:
 321   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 322   ~FlagSetting()                       { *flag = val; }
 323 };
 324 
 325 
 326 class CounterSetting {
 327   intx* counter;
 328  public:
 329   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 330   ~CounterSetting()         { (*counter)--; }
 331 };
 332 
 333 
 334 class UIntFlagSetting {
 335   uintx val;
 336   uintx* flag;
 337  public:
 338   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 339   ~UIntFlagSetting()                         { *flag = val; }
 340 };
 341 
 342 
 343 class DoubleFlagSetting {
 344   double val;
 345   double* flag;
 346  public:
 347   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 348   ~DoubleFlagSetting()                           { *flag = val; }
 349 };
 350 
 351 
 352 class CommandLineFlags {
 353  public:
 354   static bool boolAt(char* name, size_t len, bool* value);
 355   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 356   static bool boolAtPut(char* name, size_t len, bool* value, Flag::Flags origin);
 357   static bool boolAtPut(char* name, bool* value, Flag::Flags origin)   { return boolAtPut(name, strlen(name), value, origin); }
 358 
 359   static bool intxAt(char* name, size_t len, intx* value);
 360   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 361   static bool intxAtPut(char* name, size_t len, intx* value, Flag::Flags origin);
 362   static bool intxAtPut(char* name, intx* value, Flag::Flags origin)   { return intxAtPut(name, strlen(name), value, origin); }
 363 
 364   static bool uintxAt(char* name, size_t len, uintx* value);
 365   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 366   static bool uintxAtPut(char* name, size_t len, uintx* value, Flag::Flags origin);
 367   static bool uintxAtPut(char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); }
 368 
 369   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 370   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 371   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, Flag::Flags origin);
 372   static bool uint64_tAtPut(char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 373 
 374   static bool doubleAt(char* name, size_t len, double* value);
 375   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 376   static bool doubleAtPut(char* name, size_t len, double* value, Flag::Flags origin);
 377   static bool doubleAtPut(char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); }
 378 
 379   static bool ccstrAt(char* name, size_t len, ccstr* value);
 380   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 381   static bool ccstrAtPut(char* name, size_t len, ccstr* value, Flag::Flags origin);
 382   static bool ccstrAtPut(char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 383 
 384   // Returns false if name is not a command line flag.
 385   static bool wasSetOnCmdline(const char* name, bool* value);
 386   static void printSetFlags(outputStream* out);
 387 
 388   static void printFlags(outputStream* out, bool withComments);
 389 
 390   static void verify() PRODUCT_RETURN;
 391 };
 392 
 393 // use this for flags that are true by default in the debug version but
 394 // false in the optimized version, and vice versa
 395 #ifdef ASSERT
 396 #define trueInDebug  true
 397 #define falseInDebug false
 398 #else
 399 #define trueInDebug  false
 400 #define falseInDebug true
 401 #endif
 402 
 403 // use this for flags that are true per default in the product build
 404 // but false in development builds, and vice versa
 405 #ifdef PRODUCT
 406 #define trueInProduct  true
 407 #define falseInProduct false
 408 #else
 409 #define trueInProduct  false
 410 #define falseInProduct true
 411 #endif
 412 
 413 #ifdef JAVASE_EMBEDDED
 414 #define falseInEmbedded false
 415 #else
 416 #define falseInEmbedded true
 417 #endif
 418 
 419 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 420 // product flags are always settable / visible
 421 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 422 
 423 // A flag must be declared with one of the following types:
 424 // bool, intx, uintx, ccstr.
 425 // The type "ccstr" is an alias for "const char*" and is used
 426 // only in this file, because the macrology requires single-token type names.
 427 
 428 // Note: Diagnostic options not meant for VM tuning or for product modes.
 429 // They are to be used for VM quality assurance or field diagnosis
 430 // of VM bugs.  They are hidden so that users will not be encouraged to
 431 // try them as if they were VM ordinary execution options.  However, they
 432 // are available in the product version of the VM.  Under instruction
 433 // from support engineers, VM customers can turn them on to collect
 434 // diagnostic information about VM problems.  To use a VM diagnostic
 435 // option, you must first specify +UnlockDiagnosticVMOptions.
 436 // (This master switch also affects the behavior of -Xprintflags.)
 437 //
 438 // experimental flags are in support of features that are not
 439 //    part of the officially supported product, but are available
 440 //    for experimenting with. They could, for example, be performance
 441 //    features that may not have undergone full or rigorous QA, but which may
 442 //    help performance in some cases and released for experimentation
 443 //    by the community of users and developers. This flag also allows one to
 444 //    be able to build a fully supported product that nonetheless also
 445 //    ships with some unsupported, lightly tested, experimental features.
 446 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 447 //    UnlockExperimentalVMOptions flag, which allows the control and
 448 //    modification of the experimental flags.
 449 //
 450 // Nota bene: neither diagnostic nor experimental options should be used casually,
 451 //    and they are not supported on production loads, except under explicit
 452 //    direction from support engineers.
 453 //
 454 // manageable flags are writeable external product flags.
 455 //    They are dynamically writeable through the JDK management interface
 456 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 457 //    These flags are external exported interface (see CCC).  The list of
 458 //    manageable flags can be queried programmatically through the management
 459 //    interface.
 460 //
 461 //    A flag can be made as "manageable" only if
 462 //    - the flag is defined in a CCC as an external exported interface.
 463 //    - the VM implementation supports dynamic setting of the flag.
 464 //      This implies that the VM must *always* query the flag variable
 465 //      and not reuse state related to the flag state at any given time.
 466 //    - you want the flag to be queried programmatically by the customers.
 467 //
 468 // product_rw flags are writeable internal product flags.
 469 //    They are like "manageable" flags but for internal/private use.
 470 //    The list of product_rw flags are internal/private flags which
 471 //    may be changed/removed in a future release.  It can be set
 472 //    through the management interface to get/set value
 473 //    when the name of flag is supplied.
 474 //
 475 //    A flag can be made as "product_rw" only if
 476 //    - the VM implementation supports dynamic setting of the flag.
 477 //      This implies that the VM must *always* query the flag variable
 478 //      and not reuse state related to the flag state at any given time.
 479 //
 480 // Note that when there is a need to support develop flags to be writeable,
 481 // it can be done in the same way as product_rw.
 482 
 483 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 484                                                                             \
 485   lp64_product(bool, UseCompressedOops, false,                              \
 486             "Use 32-bit object references in 64-bit VM  "                   \
 487             "lp64_product means flag is always constant in 32 bit VM")      \
 488                                                                             \
 489   lp64_product(bool, UseCompressedClassPointers, false,                     \
 490             "Use 32-bit class pointers in 64-bit VM  "                      \
 491             "lp64_product means flag is always constant in 32 bit VM")      \
 492                                                                             \
 493   notproduct(bool, CheckCompressedOops, true,                               \
 494             "generate checks in encoding/decoding code in debug VM")        \
 495                                                                             \
 496   product_pd(uintx, HeapBaseMinAddress,                                     \
 497             "OS specific low limit for heap base address")                  \
 498                                                                             \
 499   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 500             "Print compressed oops base address and encoding mode")         \
 501                                                                             \
 502   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 503           "Default object alignment in bytes, 8 is minimum")                \
 504                                                                             \
 505   product(bool, AssumeMP, false,                                            \
 506           "Instruct the VM to assume multiple processors are available")    \
 507                                                                             \
 508   /* UseMembar is theoretically a temp flag used for memory barrier         \
 509    * removal testing.  It was supposed to be removed before FCS but has     \
 510    * been re-added (see 6401008) */                                         \
 511   product_pd(bool, UseMembar,                                               \
 512           "(Unstable) Issues membars on thread state transitions")          \
 513                                                                             \
 514   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 515    * that don't support it.  This will be replaced by processor detection   \
 516    * logic.                                                                 \
 517    */                                                                       \
 518   product(bool, UsePPCLWSYNC, true,                                         \
 519           "Use lwsync instruction if true, else use slower sync")           \
 520                                                                             \
 521   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 522           "Whether to clean the chunk pool asynchronously")                 \
 523                                                                             \
 524   /* Temporary: See 6948537 */                                              \
 525   experimental(bool, UseMemSetInBOT, true,                                  \
 526           "(Unstable) uses memset in BOT updates in GC code")               \
 527                                                                             \
 528   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 529           "Enable normal processing of flags relating to field diagnostics")\
 530                                                                             \
 531   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 532           "Enable normal processing of flags relating to experimental features")\
 533                                                                             \
 534   product(bool, JavaMonitorsInStackTrace, true,                             \
 535           "Print info. about Java monitor locks when the stacks are dumped")\
 536                                                                             \
 537   product_pd(bool, UseLargePages,                                           \
 538           "Use large page memory")                                          \
 539                                                                             \
 540   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 541           "Allocate large pages individually for better affinity")          \
 542                                                                             \
 543   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 544           "Fail large pages individual allocation")                         \
 545                                                                             \
 546   develop(bool, TracePageSizes, false,                                      \
 547           "Trace page size selection and usage.")                           \
 548                                                                             \
 549   product(bool, UseNUMA, false,                                             \
 550           "Use NUMA if available")                                          \
 551                                                                             \
 552   product(bool, UseNUMAInterleaving, false,                                 \
 553           "Interleave memory across NUMA nodes if available")               \
 554                                                                             \
 555   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 556           "Granularity to use for NUMA interleaving on Windows OS")         \
 557                                                                             \
 558   product(bool, ForceNUMA, false,                                           \
 559           "Force NUMA optimizations on single-node/UMA systems")            \
 560                                                                             \
 561   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 562           "Percentage (0-100) used to weigh the current sample when "      \
 563           "computing exponentially decaying average for "                   \
 564           "AdaptiveNUMAChunkSizing")                                        \
 565                                                                             \
 566   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 567           "Do not reallocate more that this amount per collection")         \
 568                                                                             \
 569   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 570           "Enable adaptive chunk sizing for NUMA")                          \
 571                                                                             \
 572   product(bool, NUMAStats, false,                                           \
 573           "Print NUMA stats in detailed heap information")                  \
 574                                                                             \
 575   product(uintx, NUMAPageScanRate, 256,                                     \
 576           "Maximum number of pages to include in the page scan procedure")  \
 577                                                                             \
 578   product_pd(bool, NeedsDeoptSuspend,                                       \
 579           "True for register window machines (sparc/ia64)")                 \
 580                                                                             \
 581   product(intx, UseSSE, 99,                                                 \
 582           "Highest supported SSE instructions set on x86/x64")              \
 583                                                                             \
 584   product(bool, UseAES, false,                                               \
 585           "Control whether AES instructions can be used on x86/x64")        \
 586                                                                             \
 587   product(uintx, LargePageSizeInBytes, 0,                                   \
 588           "Large page size (0 to let VM choose the page size")              \
 589                                                                             \
 590   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 591           "Use large pages if max heap is at least this big")               \
 592                                                                             \
 593   product(bool, ForceTimeHighResolution, false,                             \
 594           "Using high time resolution(For Win32 only)")                     \
 595                                                                             \
 596   develop(bool, TraceItables, false,                                        \
 597           "Trace initialization and use of itables")                        \
 598                                                                             \
 599   develop(bool, TracePcPatching, false,                                     \
 600           "Trace usage of frame::patch_pc")                                 \
 601                                                                             \
 602   develop(bool, TraceJumps, false,                                          \
 603           "Trace assembly jumps in thread ring buffer")                     \
 604                                                                             \
 605   develop(bool, TraceRelocator, false,                                      \
 606           "Trace the bytecode relocator")                                   \
 607                                                                             \
 608   develop(bool, TraceLongCompiles, false,                                   \
 609           "Print out every time compilation is longer than "                \
 610           "a given threashold")                                             \
 611                                                                             \
 612   develop(bool, SafepointALot, false,                                       \
 613           "Generates a lot of safepoints. Works with "                      \
 614           "GuaranteedSafepointInterval")                                    \
 615                                                                             \
 616   product_pd(bool, BackgroundCompilation,                                   \
 617           "A thread requesting compilation is not blocked during "          \
 618           "compilation")                                                    \
 619                                                                             \
 620   product(bool, PrintVMQWaitTime, false,                                    \
 621           "Prints out the waiting time in VM operation queue")              \
 622                                                                             \
 623   develop(bool, NoYieldsInMicrolock, false,                                 \
 624           "Disable yields in microlock")                                    \
 625                                                                             \
 626   develop(bool, TraceOopMapGeneration, false,                               \
 627           "Shows oopmap generation")                                        \
 628                                                                             \
 629   product(bool, MethodFlushing, true,                                       \
 630           "Reclamation of zombie and not-entrant methods")                  \
 631                                                                             \
 632   develop(bool, VerifyStack, false,                                         \
 633           "Verify stack of each thread when it is entering a runtime call") \
 634                                                                             \
 635   diagnostic(bool, ForceUnreachable, false,                                 \
 636           "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
 637                                                                             \
 638   notproduct(bool, StressDerivedPointers, false,                            \
 639           "Force scavenge when a derived pointers is detected on stack "    \
 640           "after rtm call")                                                 \
 641                                                                             \
 642   develop(bool, TraceDerivedPointers, false,                                \
 643           "Trace traversal of derived pointers on stack")                   \
 644                                                                             \
 645   notproduct(bool, TraceCodeBlobStacks, false,                              \
 646           "Trace stack-walk of codeblobs")                                  \
 647                                                                             \
 648   product(bool, PrintJNIResolving, false,                                   \
 649           "Used to implement -v:jni")                                       \
 650                                                                             \
 651   notproduct(bool, PrintRewrites, false,                                    \
 652           "Print methods that are being rewritten")                         \
 653                                                                             \
 654   product(bool, UseInlineCaches, true,                                      \
 655           "Use Inline Caches for virtual calls ")                           \
 656                                                                             \
 657   develop(bool, InlineArrayCopy, true,                                      \
 658           "inline arraycopy native that is known to be part of "            \
 659           "base library DLL")                                               \
 660                                                                             \
 661   develop(bool, InlineObjectHash, true,                                     \
 662           "inline Object::hashCode() native that is known to be part "      \
 663           "of base library DLL")                                            \
 664                                                                             \
 665   develop(bool, InlineNatives, true,                                        \
 666           "inline natives that are known to be part of base library DLL")   \
 667                                                                             \
 668   develop(bool, InlineMathNatives, true,                                    \
 669           "inline SinD, CosD, etc.")                                        \
 670                                                                             \
 671   develop(bool, InlineClassNatives, true,                                   \
 672           "inline Class.isInstance, etc")                                   \
 673                                                                             \
 674   develop(bool, InlineThreadNatives, true,                                  \
 675           "inline Thread.currentThread, etc")                               \
 676                                                                             \
 677   develop(bool, InlineUnsafeOps, true,                                      \
 678           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 679                                                                             \
 680   product(bool, CriticalJNINatives, true,                                   \
 681           "check for critical JNI entry points")                            \
 682                                                                             \
 683   notproduct(bool, StressCriticalJNINatives, false,                         \
 684             "Exercise register saving code in critical natives")            \
 685                                                                             \
 686   product(bool, UseSSE42Intrinsics, false,                                  \
 687           "SSE4.2 versions of intrinsics")                                  \
 688                                                                             \
 689   product(bool, UseAESIntrinsics, false,                                    \
 690           "use intrinsics for AES versions of crypto")                      \
 691                                                                             \
 692   product(bool, UseCRC32Intrinsics, false,                                  \
 693           "use intrinsics for java.util.zip.CRC32")                         \
 694                                                                             \
 695   develop(bool, TraceCallFixup, false,                                      \
 696           "traces all call fixups")                                         \
 697                                                                             \
 698   develop(bool, DeoptimizeALot, false,                                      \
 699           "deoptimize at every exit from the runtime system")               \
 700                                                                             \
 701   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 702           "a comma separated list of bcis to deoptimize at")                \
 703                                                                             \
 704   product(bool, DeoptimizeRandom, false,                                    \
 705           "deoptimize random frames on random exit from the runtime system")\
 706                                                                             \
 707   notproduct(bool, ZombieALot, false,                                       \
 708           "creates zombies (non-entrant) at exit from the runt. system")    \
 709                                                                             \
 710   product(bool, UnlinkSymbolsALot, false,                                   \
 711           "unlink unreferenced symbols from the symbol table at safepoints")\
 712                                                                             \
 713   notproduct(bool, WalkStackALot, false,                                    \
 714           "trace stack (no print) at every exit from the runtime system")   \
 715                                                                             \
 716   product(bool, Debugging, false,                                           \
 717           "set when executing debug methods in debug.ccp "                  \
 718           "(to prevent triggering assertions)")                             \
 719                                                                             \
 720   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 721           "Enable strict checks that safepoints cannot happen for threads " \
 722           "that used No_Safepoint_Verifier")                                \
 723                                                                             \
 724   notproduct(bool, VerifyLastFrame, false,                                  \
 725           "Verify oops on last frame on entry to VM")                       \
 726                                                                             \
 727   develop(bool, TraceHandleAllocation, false,                               \
 728           "Prints out warnings when suspicious many handles are allocated") \
 729                                                                             \
 730   product(bool, UseCompilerSafepoints, true,                                \
 731           "Stop at safepoints in compiled code")                            \
 732                                                                             \
 733   product(bool, FailOverToOldVerifier, true,                                \
 734           "fail over to old verifier when split verifier fails")            \
 735                                                                             \
 736   develop(bool, ShowSafepointMsgs, false,                                   \
 737           "Show msg. about safepoint synch.")                               \
 738                                                                             \
 739   product(bool, SafepointTimeout, false,                                    \
 740           "Time out and warn or fail after SafepointTimeoutDelay "          \
 741           "milliseconds if failed to reach safepoint")                      \
 742                                                                             \
 743   develop(bool, DieOnSafepointTimeout, false,                               \
 744           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 745                                                                             \
 746   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 747   /* typically, at most a few retries are needed */                         \
 748   product(intx, SuspendRetryCount, 50,                                      \
 749           "Maximum retry count for an external suspend request")            \
 750                                                                             \
 751   product(intx, SuspendRetryDelay, 5,                                       \
 752           "Milliseconds to delay per retry (* current_retry_count)")        \
 753                                                                             \
 754   product(bool, AssertOnSuspendWaitFailure, false,                          \
 755           "Assert/Guarantee on external suspend wait failure")              \
 756                                                                             \
 757   product(bool, TraceSuspendWaitFailures, false,                            \
 758           "Trace external suspend wait failures")                           \
 759                                                                             \
 760   product(bool, MaxFDLimit, true,                                           \
 761           "Bump the number of file descriptors to max in solaris.")         \
 762                                                                             \
 763   diagnostic(bool, LogEvents, true,                                         \
 764              "Enable the various ring buffer event logs")                   \
 765                                                                             \
 766   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 767              "Enable the various ring buffer event logs")                   \
 768                                                                             \
 769   product(bool, BytecodeVerificationRemote, true,                           \
 770           "Enables the Java bytecode verifier for remote classes")          \
 771                                                                             \
 772   product(bool, BytecodeVerificationLocal, false,                           \
 773           "Enables the Java bytecode verifier for local classes")           \
 774                                                                             \
 775   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 776           "Force exceptions on FP stack under/overflow")                    \
 777                                                                             \
 778   develop(bool, VerifyStackAtCalls, false,                                  \
 779           "Verify that the stack pointer is unchanged after calls")         \
 780                                                                             \
 781   develop(bool, TraceJavaAssertions, false,                                 \
 782           "Trace java language assertions")                                 \
 783                                                                             \
 784   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 785           "temporary - see javaClasses.cpp")                                \
 786                                                                             \
 787   notproduct(bool, PrintMallocFree, false,                                  \
 788           "Trace calls to C heap malloc/free allocation")                   \
 789                                                                             \
 790   product(bool, PrintOopAddress, false,                                     \
 791           "Always print the location of the oop")                           \
 792                                                                             \
 793   notproduct(bool, VerifyCodeCacheOften, false,                             \
 794           "Verify compiled-code cache often")                               \
 795                                                                             \
 796   develop(bool, ZapDeadCompiledLocals, false,                               \
 797           "Zap dead locals in compiler frames")                             \
 798                                                                             \
 799   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 800           "Zap dead locals (old version, zaps all frames when "             \
 801           "entering the VM")                                                \
 802                                                                             \
 803   notproduct(bool, CheckOopishValues, false,                                \
 804           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 805                                                                             \
 806   develop(bool, UseMallocOnly, false,                                       \
 807           "use only malloc/free for allocation (no resource area/arena)")   \
 808                                                                             \
 809   develop(bool, PrintMalloc, false,                                         \
 810           "print all malloc/free calls")                                    \
 811                                                                             \
 812   develop(bool, PrintMallocStatistics, false,                               \
 813           "print malloc/free statistics")                                   \
 814                                                                             \
 815   develop(bool, ZapResourceArea, trueInDebug,                               \
 816           "Zap freed resource/arena space with 0xABABABAB")                 \
 817                                                                             \
 818   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 819           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 820                                                                             \
 821   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 822           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 823                                                                             \
 824   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 825              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 826                                                                             \
 827   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 828           "Zap unused heap space with 0xBAADBABE")                          \
 829                                                                             \
 830   develop(bool, TraceZapUnusedHeapArea, false,                              \
 831           "Trace zapping of unused heap space")                             \
 832                                                                             \
 833   develop(bool, CheckZapUnusedHeapArea, false,                              \
 834           "Check zapping of unused heap space")                             \
 835                                                                             \
 836   develop(bool, ZapFillerObjects, trueInDebug,                              \
 837           "Zap filler objects with 0xDEAFBABE")                             \
 838                                                                             \
 839   develop(bool, PrintVMMessages, true,                                      \
 840           "Print vm messages on console")                                   \
 841                                                                             \
 842   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 843           "Print the time the application has been running")                \
 844                                                                             \
 845   product(bool, PrintGCApplicationStoppedTime, false,                       \
 846           "Print the time the application has been stopped")                \
 847                                                                             \
 848   diagnostic(bool, VerboseVerification, false,                              \
 849              "Display detailed verification details")                       \
 850                                                                             \
 851   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 852           "If > 0, provokes an error after VM initialization; the value"    \
 853           "determines which error to provoke.  See test_error_handler()"    \
 854           "in debug.cpp.")                                                  \
 855                                                                             \
 856   develop(bool, Verbose, false,                                             \
 857           "Prints additional debugging information from other modes")       \
 858                                                                             \
 859   develop(bool, PrintMiscellaneous, false,                                  \
 860           "Prints uncategorized debugging information (requires +Verbose)") \
 861                                                                             \
 862   develop(bool, WizardMode, false,                                          \
 863           "Prints much more debugging information")                         \
 864                                                                             \
 865   product(bool, ShowMessageBoxOnError, false,                               \
 866           "Keep process alive on VM fatal error")                           \
 867                                                                             \
 868   product(bool, CreateMinidumpOnCrash, false,                               \
 869           "Create minidump on VM fatal error")                              \
 870                                                                             \
 871   product_pd(bool, UseOSErrorReporting,                                     \
 872           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 873                                                                             \
 874   product(bool, SuppressFatalErrorMessage, false,                           \
 875           "Do NO Fatal Error report [Avoid deadlock]")                      \
 876                                                                             \
 877   product(ccstrlist, OnError, "",                                           \
 878           "Run user-defined commands on fatal error; see VMError.cpp "      \
 879           "for examples")                                                   \
 880                                                                             \
 881   product(ccstrlist, OnOutOfMemoryError, "",                                \
 882           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 883                                                                             \
 884   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 885           "Dump heap to file before any major stop-world GC")               \
 886                                                                             \
 887   manageable(bool, HeapDumpAfterFullGC, false,                              \
 888           "Dump heap to file after any major stop-world GC")                \
 889                                                                             \
 890   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 891           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 892                                                                             \
 893   manageable(ccstr, HeapDumpPath, NULL,                                     \
 894           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 895           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 896           "in the working directory)")                                      \
 897                                                                             \
 898   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 899           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 900           "when the heap usage is larger than this")                        \
 901                                                                             \
 902   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 903           "Approximate segment size when generating a segmented heap dump") \
 904                                                                             \
 905   develop(bool, BreakAtWarning, false,                                      \
 906           "Execute breakpoint upon encountering VM warning")                \
 907                                                                             \
 908   develop(bool, TraceVMOperation, false,                                    \
 909           "Trace vm operations")                                            \
 910                                                                             \
 911   develop(bool, UseFakeTimers, false,                                       \
 912           "Tells whether the VM should use system time or a fake timer")    \
 913                                                                             \
 914   product(ccstr, NativeMemoryTracking, "off",                               \
 915           "Native memory tracking options")                                 \
 916                                                                             \
 917   diagnostic(bool, PrintNMTStatistics, false,                               \
 918           "Print native memory tracking summary data if it is on")          \
 919                                                                             \
 920   diagnostic(bool, AutoShutdownNMT, true,                                   \
 921           "Automatically shutdown native memory tracking under stress "     \
 922           "situation. When set to false, native memory tracking tries to "  \
 923           "stay alive at the expense of JVM performance")                   \
 924                                                                             \
 925   diagnostic(bool, LogCompilation, false,                                   \
 926           "Log compilation activity in detail to LogFile")                  \
 927                                                                             \
 928   product(bool, PrintCompilation, false,                                    \
 929           "Print compilations")                                             \
 930                                                                             \
 931   diagnostic(bool, TraceNMethodInstalls, false,                             \
 932              "Trace nmethod intallation")                                   \
 933                                                                             \
 934   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 935              "0: do not allow scavengable oops in the code cache; "         \
 936              "1: allow scavenging from the code cache; "                    \
 937              "2: emit as many constants as the compiler can see")           \
 938                                                                             \
 939   product(bool, AlwaysRestoreFPU, false,                                    \
 940           "Restore the FPU control word after every JNI call (expensive)")  \
 941                                                                             \
 942   diagnostic(bool, PrintCompilation2, false,                                \
 943           "Print additional statistics per compilation")                    \
 944                                                                             \
 945   diagnostic(bool, PrintAdapterHandlers, false,                             \
 946           "Print code generated for i2c/c2i adapters")                      \
 947                                                                             \
 948   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 949           "Verify that i2c/c2i adapters are called properly")               \
 950                                                                             \
 951   develop(bool, VerifyAdapterSharing, false,                                \
 952           "Verify that the code for shared adapters is the equivalent")     \
 953                                                                             \
 954   diagnostic(bool, PrintAssembly, false,                                    \
 955           "Print assembly code (using external disassembler.so)")           \
 956                                                                             \
 957   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 958           "Options string passed to disassembler.so")                       \
 959                                                                             \
 960   diagnostic(bool, PrintNMethods, false,                                    \
 961           "Print assembly code for nmethods when generated")                \
 962                                                                             \
 963   diagnostic(bool, PrintNativeNMethods, false,                              \
 964           "Print assembly code for native nmethods when generated")         \
 965                                                                             \
 966   develop(bool, PrintDebugInfo, false,                                      \
 967           "Print debug information for all nmethods when generated")        \
 968                                                                             \
 969   develop(bool, PrintRelocations, false,                                    \
 970           "Print relocation information for all nmethods when generated")   \
 971                                                                             \
 972   develop(bool, PrintDependencies, false,                                   \
 973           "Print dependency information for all nmethods when generated")   \
 974                                                                             \
 975   develop(bool, PrintExceptionHandlers, false,                              \
 976           "Print exception handler tables for all nmethods when generated") \
 977                                                                             \
 978   develop(bool, StressCompiledExceptionHandlers, false,                     \
 979          "Exercise compiled exception handlers")                            \
 980                                                                             \
 981   develop(bool, InterceptOSException, false,                                \
 982           "Starts debugger when an implicit OS (e.g., NULL) "               \
 983           "exception happens")                                              \
 984                                                                             \
 985   product(bool, PrintCodeCache, false,                                      \
 986           "Print the code cache memory usage when exiting")                 \
 987                                                                             \
 988   develop(bool, PrintCodeCache2, false,                                     \
 989           "Print detailed usage info on the code cache when exiting")       \
 990                                                                             \
 991   product(bool, PrintCodeCacheOnCompilation, false,                         \
 992           "Print the code cache memory usage each time a method is compiled") \
 993                                                                             \
 994   diagnostic(bool, PrintStubCode, false,                                    \
 995           "Print generated stub code")                                      \
 996                                                                             \
 997   product(bool, StackTraceInThrowable, true,                                \
 998           "Collect backtrace in throwable when exception happens")          \
 999                                                                             \
1000   product(bool, OmitStackTraceInFastThrow, true,                            \
1001           "Omit backtraces for some 'hot' exceptions in optimized code")    \
1002                                                                             \
1003   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
1004           "Prints byte code statictics when dumping profiler output")       \
1005                                                                             \
1006   product(bool, ProfilerRecordPC, false,                                    \
1007           "Collects tick for each 16 byte interval of compiled code")       \
1008                                                                             \
1009   product(bool, ProfileVM, false,                                           \
1010           "Profiles ticks that fall within VM (either in the VM Thread "    \
1011           "or VM code called through stubs)")                               \
1012                                                                             \
1013   product(bool, ProfileIntervals, false,                                    \
1014           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
1015                                                                             \
1016   notproduct(bool, ProfilerCheckIntervals, false,                           \
1017           "Collect and print info on spacing of profiler ticks")            \
1018                                                                             \
1019   develop(bool, PrintJVMWarnings, false,                                    \
1020           "Prints warnings for unimplemented JVM functions")                \
1021                                                                             \
1022   product(bool, PrintWarnings, true,                                        \
1023           "Prints JVM warnings to output stream")                           \
1024                                                                             \
1025   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
1026           "Prints warnings for stalled SpinLocks")                          \
1027                                                                             \
1028   product(bool, RegisterFinalizersAtInit, true,                             \
1029           "Register finalizable objects at end of Object.<init> or "        \
1030           "after allocation")                                               \
1031                                                                             \
1032   develop(bool, RegisterReferences, true,                                   \
1033           "Tells whether the VM should register soft/weak/final/phantom "   \
1034           "references")                                                     \
1035                                                                             \
1036   develop(bool, IgnoreRewrites, false,                                      \
1037           "Supress rewrites of bytecodes in the oopmap generator. "         \
1038           "This is unsafe!")                                                \
1039                                                                             \
1040   develop(bool, PrintCodeCacheExtension, false,                             \
1041           "Print extension of code cache")                                  \
1042                                                                             \
1043   develop(bool, UsePrivilegedStack, true,                                   \
1044           "Enable the security JVM functions")                              \
1045                                                                             \
1046   develop(bool, ProtectionDomainVerification, true,                         \
1047           "Verifies protection domain before resolution in system "         \
1048           "dictionary")                                                     \
1049                                                                             \
1050   product(bool, ClassUnloading, true,                                       \
1051           "Do unloading of classes")                                        \
1052                                                                             \
1053   develop(bool, DisableStartThread, false,                                  \
1054           "Disable starting of additional Java threads "                    \
1055           "(for debugging only)")                                           \
1056                                                                             \
1057   develop(bool, MemProfiling, false,                                        \
1058           "Write memory usage profiling to log file")                       \
1059                                                                             \
1060   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1061           "Prints the system dictionary at exit")                           \
1062                                                                             \
1063   experimental(intx, PredictedLoadedClassCount, 0,                          \
1064           "Experimental: Tune loaded class cache starting size.")           \
1065                                                                             \
1066   diagnostic(bool, UnsyncloadClass, false,                                  \
1067           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1068           "class loader  must call VM synchronized for findClass "          \
1069           "and defineClass.")                                               \
1070                                                                             \
1071   product(bool, AlwaysLockClassLoader, false,                               \
1072           "Require the VM to acquire the class loader lock before calling " \
1073           "loadClass() even for class loaders registering "                 \
1074           "as parallel capable")                                            \
1075                                                                             \
1076   product(bool, AllowParallelDefineClass, false,                            \
1077           "Allow parallel defineClass requests for class loaders "          \
1078           "registering as parallel capable")                                \
1079                                                                             \
1080   product(bool, MustCallLoadClassInternal, false,                           \
1081           "Call loadClassInternal() rather than loadClass()")               \
1082                                                                             \
1083   product_pd(bool, DontYieldALot,                                           \
1084           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1085                                                                             \
1086   product_pd(bool, ConvertSleepToYield,                                     \
1087           "Converts sleep(0) to thread yield "                              \
1088           "(may be off for SOLARIS to improve GUI)")                        \
1089                                                                             \
1090   product(bool, ConvertYieldToSleep, false,                                 \
1091           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1092           "behavior (SOLARIS only)")                                        \
1093                                                                             \
1094   product(bool, UseBoundThreads, true,                                      \
1095           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1096                                                                             \
1097   develop(bool, UseDetachedThreads, true,                                   \
1098           "Use detached threads that are recycled upon termination "        \
1099           "(for SOLARIS only)")                                             \
1100                                                                             \
1101   product(bool, UseLWPSynchronization, true,                                \
1102           "Use LWP-based instead of libthread-based synchronization "       \
1103           "(SPARC only)")                                                   \
1104                                                                             \
1105   product(ccstr, SyncKnobs, NULL,                                           \
1106           "(Unstable) Various monitor synchronization tunables")            \
1107                                                                             \
1108   product(intx, EmitSync, 0,                                                \
1109           "(Unsafe,Unstable) "                                              \
1110           " Controls emission of inline sync fast-path code")               \
1111                                                                             \
1112   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1113                                                                             \
1114   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1115                                                                             \
1116   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1117                                                                             \
1118   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1119                                                                             \
1120   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1121                                                                             \
1122   product(intx, hashCode, 5,                                                \
1123          "(Unstable) select hashCode generation algorithm" )                \
1124                                                                             \
1125   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1126          "(Unstable, Linux-specific)"                                       \
1127          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1128                                                                             \
1129   product(bool, FilterSpuriousWakeups, true,                                \
1130           "Prevent spurious or premature wakeups from object.wait "         \
1131           "(Solaris only)")                                                 \
1132                                                                             \
1133   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1134   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1135   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1136                                                                             \
1137   develop(bool, UsePthreads, false,                                         \
1138           "Use pthread-based instead of libthread-based synchronization "   \
1139           "(SPARC only)")                                                   \
1140                                                                             \
1141   product(bool, AdjustConcurrency, false,                                   \
1142           "call thr_setconcurrency at thread create time to avoid "         \
1143           "LWP starvation on MP systems (For Solaris Only)")                \
1144                                                                             \
1145   product(bool, ReduceSignalUsage, false,                                   \
1146           "Reduce the use of OS signals in Java and/or the VM")             \
1147                                                                             \
1148   develop_pd(bool, ShareVtableStubs,                                        \
1149           "Share vtable stubs (smaller code but worse branch prediction")   \
1150                                                                             \
1151   develop(bool, LoadLineNumberTables, true,                                 \
1152           "Tells whether the class file parser loads line number tables")   \
1153                                                                             \
1154   develop(bool, LoadLocalVariableTables, true,                              \
1155           "Tells whether the class file parser loads local variable tables")\
1156                                                                             \
1157   develop(bool, LoadLocalVariableTypeTables, true,                          \
1158           "Tells whether the class file parser loads local variable type tables")\
1159                                                                             \
1160   product(bool, AllowUserSignalHandlers, false,                             \
1161           "Do not complain if the application installs signal handlers "    \
1162           "(Solaris & Linux only)")                                         \
1163                                                                             \
1164   product(bool, UseSignalChaining, true,                                    \
1165           "Use signal-chaining to invoke signal handlers installed "        \
1166           "by the application (Solaris & Linux only)")                      \
1167                                                                             \
1168   product(bool, UseAltSigs, false,                                          \
1169           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1170           "internal signals (Solaris only)")                                \
1171                                                                             \
1172   product(bool, AllowJNIEnvProxy, false,                                    \
1173           "Allow JNIEnv proxies for jdbx")                                  \
1174                                                                             \
1175   product(bool, JNIDetachReleasesMonitors, true,                            \
1176           "JNI DetachCurrentThread releases monitors owned by thread")      \
1177                                                                             \
1178   product(bool, RestoreMXCSROnJNICalls, false,                              \
1179           "Restore MXCSR when returning from JNI calls")                    \
1180                                                                             \
1181   product(bool, CheckJNICalls, false,                                       \
1182           "Verify all arguments to JNI calls")                              \
1183                                                                             \
1184   product(bool, UseFastJNIAccessors, true,                                  \
1185           "Use optimized versions of Get<Primitive>Field")                  \
1186                                                                             \
1187   product(bool, EagerXrunInit, false,                                       \
1188           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1189           " but not all -Xrun libraries may support the state of the VM at this time") \
1190                                                                             \
1191   product(bool, PreserveAllAnnotations, false,                              \
1192           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1193                                                                             \
1194   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1195           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1196                                                                             \
1197   product(bool, LazyBootClassLoader, true,                                  \
1198           "Enable/disable lazy opening of boot class path entries")         \
1199                                                                             \
1200   product(bool, UseXMMForArrayCopy, false,                                  \
1201           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1202                                                                             \
1203   product(intx, FieldsAllocationStyle, 1,                                   \
1204           "0 - type based with oops first, 1 - with oops last, "            \
1205           "2 - oops in super and sub classes are together")                 \
1206                                                                             \
1207   product(bool, CompactFields, true,                                        \
1208           "Allocate nonstatic fields in gaps between previous fields")      \
1209                                                                             \
1210   notproduct(bool, PrintFieldLayout, false,                                 \
1211           "Print field layout for each class")                              \
1212                                                                             \
1213   product(intx, ContendedPaddingWidth, 128,                                 \
1214           "How many bytes to pad the fields/classes marked @Contended with")\
1215                                                                             \
1216   product(bool, EnableContended, true,                                      \
1217           "Enable @Contended annotation support")                           \
1218                                                                             \
1219   product(bool, RestrictContended, true,                                    \
1220           "Restrict @Contended to trusted classes")                         \
1221                                                                             \
1222   product(bool, UseBiasedLocking, true,                                     \
1223           "Enable biased locking in JVM")                                   \
1224                                                                             \
1225   product(intx, BiasedLockingStartupDelay, 4000,                            \
1226           "Number of milliseconds to wait before enabling biased locking")  \
1227                                                                             \
1228   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1229           "Print statistics of biased locking in JVM")                      \
1230                                                                             \
1231   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1232           "Threshold of number of revocations per type to try to "          \
1233           "rebias all objects in the heap of that type")                    \
1234                                                                             \
1235   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1236           "Threshold of number of revocations per type to permanently "     \
1237           "revoke biases of all objects in the heap of that type")          \
1238                                                                             \
1239   product(intx, BiasedLockingDecayTime, 25000,                              \
1240           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1241           "type after previous bulk rebias")                                \
1242                                                                             \
1243   /* tracing */                                                             \
1244                                                                             \
1245   notproduct(bool, TraceRuntimeCalls, false,                                \
1246           "Trace run-time calls")                                           \
1247                                                                             \
1248   develop(bool, TraceJNICalls, false,                                       \
1249           "Trace JNI calls")                                                \
1250                                                                             \
1251   notproduct(bool, TraceJVMCalls, false,                                    \
1252           "Trace JVM calls")                                                \
1253                                                                             \
1254   product(ccstr, TraceJVMTI, NULL,                                          \
1255           "Trace flags for JVMTI functions and events")                     \
1256                                                                             \
1257   /* This option can change an EMCP method into an obsolete method. */      \
1258   /* This can affect tests that except specific methods to be EMCP. */      \
1259   /* This option should be used with caution. */                            \
1260   product(bool, StressLdcRewrite, false,                                    \
1261           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1262                                                                             \
1263   product(intx, TraceRedefineClasses, 0,                                    \
1264           "Trace level for JVMTI RedefineClasses")                          \
1265                                                                             \
1266   develop(bool, StressMethodComparator, false,                              \
1267           "run the MethodComparator on all loaded methods")                 \
1268                                                                             \
1269   /* change to false by default sometime after Mustang */                   \
1270   product(bool, VerifyMergedCPBytecodes, true,                              \
1271           "Verify bytecodes after RedefineClasses constant pool merging")   \
1272                                                                             \
1273   develop(bool, TraceJNIHandleAllocation, false,                            \
1274           "Trace allocation/deallocation of JNI handle blocks")             \
1275                                                                             \
1276   develop(bool, TraceThreadEvents, false,                                   \
1277           "Trace all thread events")                                        \
1278                                                                             \
1279   develop(bool, TraceBytecodes, false,                                      \
1280           "Trace bytecode execution")                                       \
1281                                                                             \
1282   develop(bool, TraceClassInitialization, false,                            \
1283           "Trace class initialization")                                     \
1284                                                                             \
1285   develop(bool, TraceExceptions, false,                                     \
1286           "Trace exceptions")                                               \
1287                                                                             \
1288   develop(bool, TraceICs, false,                                            \
1289           "Trace inline cache changes")                                     \
1290                                                                             \
1291   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1292           "Trace method invocation counter overflow")                       \
1293                                                                             \
1294   develop(bool, TraceInlineCacheClearing, false,                            \
1295           "Trace clearing of inline caches in nmethods")                    \
1296                                                                             \
1297   develop(bool, TraceDependencies, false,                                   \
1298           "Trace dependencies")                                             \
1299                                                                             \
1300   develop(bool, VerifyDependencies, trueInDebug,                            \
1301          "Exercise and verify the compilation dependency mechanism")        \
1302                                                                             \
1303   develop(bool, TraceNewOopMapGeneration, false,                            \
1304           "Trace OopMapGeneration")                                         \
1305                                                                             \
1306   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1307           "Trace OopMapGeneration: print detailed cell states")             \
1308                                                                             \
1309   develop(bool, TimeOopMap, false,                                          \
1310           "Time calls to GenerateOopMap::compute_map() in sum")             \
1311                                                                             \
1312   develop(bool, TimeOopMap2, false,                                         \
1313           "Time calls to GenerateOopMap::compute_map() individually")       \
1314                                                                             \
1315   develop(bool, TraceMonitorMismatch, false,                                \
1316           "Trace monitor matching failures during OopMapGeneration")        \
1317                                                                             \
1318   develop(bool, TraceOopMapRewrites, false,                                 \
1319           "Trace rewritting of method oops during oop map generation")      \
1320                                                                             \
1321   develop(bool, TraceSafepoint, false,                                      \
1322           "Trace safepoint operations")                                     \
1323                                                                             \
1324   develop(bool, TraceICBuffer, false,                                       \
1325           "Trace usage of IC buffer")                                       \
1326                                                                             \
1327   develop(bool, TraceCompiledIC, false,                                     \
1328           "Trace changes of compiled IC")                                   \
1329                                                                             \
1330   notproduct(bool, TraceZapDeadLocals, false,                               \
1331           "Trace zapping dead locals")                                      \
1332                                                                             \
1333   develop(bool, TraceStartupTime, false,                                    \
1334           "Trace setup time")                                               \
1335                                                                             \
1336   develop(bool, TraceProtectionDomainVerification, false,                   \
1337           "Trace protection domain verifcation")                            \
1338                                                                             \
1339   develop(bool, TraceClearedExceptions, false,                              \
1340           "Prints when an exception is forcibly cleared")                   \
1341                                                                             \
1342   product(bool, TraceClassResolution, false,                                \
1343           "Trace all constant pool resolutions (for debugging)")            \
1344                                                                             \
1345   product(bool, TraceBiasedLocking, false,                                  \
1346           "Trace biased locking in JVM")                                    \
1347                                                                             \
1348   product(bool, TraceMonitorInflation, false,                               \
1349           "Trace monitor inflation in JVM")                                 \
1350                                                                             \
1351   /* gc */                                                                  \
1352                                                                             \
1353   product(bool, UseSerialGC, false,                                         \
1354           "Use the serial garbage collector")                               \
1355                                                                             \
1356   product(bool, UseG1GC, false,                                             \
1357           "Use the Garbage-First garbage collector")                        \
1358                                                                             \
1359   product(bool, UseParallelGC, false,                                       \
1360           "Use the Parallel Scavenge garbage collector")                    \
1361                                                                             \
1362   product(bool, UseParallelOldGC, false,                                    \
1363           "Use the Parallel Old garbage collector")                         \
1364                                                                             \
1365   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1366           "How often should we maximally compact the heap (not allowing "   \
1367           "any dead space)")                                                \
1368                                                                             \
1369   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1370           "The collection count for the first maximum compaction")          \
1371                                                                             \
1372   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1373           "In the Parallel Old garbage collector maximum compaction for "   \
1374           "a system GC")                                                    \
1375                                                                             \
1376   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1377           "The mean used by the par compact dead wood"                      \
1378           "limiter (a number between 0-100).")                              \
1379                                                                             \
1380   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1381           "The standard deviation used by the par compact dead wood"        \
1382           "limiter (a number between 0-100).")                              \
1383                                                                             \
1384   product(uintx, ParallelGCThreads, 0,                                      \
1385           "Number of parallel threads parallel gc will use")                \
1386                                                                             \
1387   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1388           "Dynamically choose the number of parallel threads "              \
1389           "parallel gc will use")                                           \
1390                                                                             \
1391   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1392           "Force dynamic selection of the number of"                        \
1393           "parallel threads parallel gc will use to aid debugging")         \
1394                                                                             \
1395   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1396           "Size of heap (bytes) per GC thread used in calculating the "     \
1397           "number of GC threads")                                           \
1398                                                                             \
1399   product(bool, TraceDynamicGCThreads, false,                               \
1400           "Trace the dynamic GC thread usage")                              \
1401                                                                             \
1402   develop(bool, ParallelOldGCSplitALot, false,                              \
1403           "Provoke splitting (copying data from a young gen space to"       \
1404           "multiple destination spaces)")                                   \
1405                                                                             \
1406   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1407           "How often to provoke splitting a young gen space")               \
1408                                                                             \
1409   product(uintx, ConcGCThreads, 0,                                          \
1410           "Number of threads concurrent gc will use")                       \
1411                                                                             \
1412   product(uintx, YoungPLABSize, 4096,                                       \
1413           "Size of young gen promotion labs (in HeapWords)")                \
1414                                                                             \
1415   product(uintx, OldPLABSize, 1024,                                         \
1416           "Size of old gen promotion labs (in HeapWords)")                  \
1417                                                                             \
1418   product(uintx, GCTaskTimeStampEntries, 200,                               \
1419           "Number of time stamp entries per gc worker thread")              \
1420                                                                             \
1421   product(bool, AlwaysTenure, false,                                        \
1422           "Always tenure objects in eden. (ParallelGC only)")               \
1423                                                                             \
1424   product(bool, NeverTenure, false,                                         \
1425           "Never tenure objects in eden, May tenure on overflow "           \
1426           "(ParallelGC only)")                                              \
1427                                                                             \
1428   product(bool, ScavengeBeforeFullGC, true,                                 \
1429           "Scavenge youngest generation before each full GC, "              \
1430           "used with UseParallelGC")                                        \
1431                                                                             \
1432   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1433           "Allow scavenges to occur when to_space contains objects.")       \
1434                                                                             \
1435   product(bool, UseConcMarkSweepGC, false,                                  \
1436           "Use Concurrent Mark-Sweep GC in the old generation")             \
1437                                                                             \
1438   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1439           "A System.gc() request invokes a concurrent collection;"          \
1440           " (effective only when UseConcMarkSweepGC)")                      \
1441                                                                             \
1442   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1443           "A System.gc() request invokes a concurrent collection and "      \
1444           "also unloads classes during such a concurrent gc cycle "         \
1445           "(effective only when UseConcMarkSweepGC)")                       \
1446                                                                             \
1447   product(bool, GCLockerInvokesConcurrent, false,                           \
1448           "The exit of a JNI CS necessitating a scavenge also"              \
1449           " kicks off a bkgrd concurrent collection")                       \
1450                                                                             \
1451   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1452           "How much the GC can expand the eden by while the GC locker  "    \
1453           "is active (as a percentage)")                                    \
1454                                                                             \
1455   diagnostic(intx, GCLockerRetryAllocationCount, 2,                         \
1456           "Number of times to retry allocations when"                       \
1457           " blocked by the GC locker")                                      \
1458                                                                             \
1459   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1460           "Use Adaptive Free Lists in the CMS generation")                  \
1461                                                                             \
1462   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1463           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1464                                                                             \
1465   develop(bool, RotateCMSCollectionTypes, false,                            \
1466           "Rotate the CMS collections among concurrent and STW")            \
1467                                                                             \
1468   product(bool, UseCMSBestFit, true,                                        \
1469           "Use CMS best fit allocation strategy")                           \
1470                                                                             \
1471   product(bool, UseCMSCollectionPassing, true,                              \
1472           "Use passing of collection from background to foreground")        \
1473                                                                             \
1474   product(bool, UseParNewGC, false,                                         \
1475           "Use parallel threads in the new generation.")                    \
1476                                                                             \
1477   product(bool, ParallelGCVerbose, false,                                   \
1478           "Verbose output for parallel GC.")                                \
1479                                                                             \
1480   product(uintx, ParallelGCBufferWastePct, 10,                              \
1481           "Wasted fraction of parallel allocation buffer.")                 \
1482                                                                             \
1483   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1484              "Retain parallel allocation buffers across scavenges; "        \
1485              " -- disabled because this currently conflicts with "          \
1486              " parallel card scanning under certain conditions ")           \
1487                                                                             \
1488   product(uintx, TargetPLABWastePct, 10,                                    \
1489           "Target wasted space in last buffer as percent of overall "       \
1490           "allocation")                                                     \
1491                                                                             \
1492   product(uintx, PLABWeight, 75,                                            \
1493           "Percentage (0-100) used to weight the current sample when"       \
1494           "computing exponentially decaying average for ResizePLAB.")       \
1495                                                                             \
1496   product(bool, ResizePLAB, true,                                           \
1497           "Dynamically resize (survivor space) promotion labs")             \
1498                                                                             \
1499   product(bool, PrintPLAB, false,                                           \
1500           "Print (survivor space) promotion labs sizing decisions")         \
1501                                                                             \
1502   product(intx, ParGCArrayScanChunk, 50,                                    \
1503           "Scan a subset and push remainder, if array is bigger than this") \
1504                                                                             \
1505   product(bool, ParGCUseLocalOverflow, false,                               \
1506           "Instead of a global overflow list, use local overflow stacks")   \
1507                                                                             \
1508   product(bool, ParGCTrimOverflow, true,                                    \
1509           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1510                                                                             \
1511   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1512           "Whether we should simulate work queue overflow in ParNew")       \
1513                                                                             \
1514   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1515           "An `interval' counter that determines how frequently "           \
1516           "we simulate overflow; a smaller number increases frequency")     \
1517                                                                             \
1518   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1519           "The desired number of objects to claim from the overflow list")  \
1520                                                                             \
1521   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1522           "The number of strides per worker thread that we divide up the "  \
1523           "card table scanning work into")                                  \
1524                                                                             \
1525   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1526           "The number of cards in each chunk of the parallel chunks used "  \
1527           "during card table scanning")                                     \
1528                                                                             \
1529   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1530           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1531           "parallel GC.")                                                   \
1532                                                                             \
1533   product(uintx, OldPLABWeight, 50,                                         \
1534           "Percentage (0-100) used to weight the current sample when"       \
1535           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1536                                                                             \
1537   product(bool, ResizeOldPLAB, true,                                        \
1538           "Dynamically resize (old gen) promotion labs")                    \
1539                                                                             \
1540   product(bool, PrintOldPLAB, false,                                        \
1541           "Print (old gen) promotion labs sizing decisions")                \
1542                                                                             \
1543   product(uintx, CMSOldPLABMin, 16,                                         \
1544           "Min size of CMS gen promotion lab caches per worker per blksize")\
1545                                                                             \
1546   product(uintx, CMSOldPLABMax, 1024,                                       \
1547           "Max size of CMS gen promotion lab caches per worker per blksize")\
1548                                                                             \
1549   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1550           "Nominal number of refills of CMS gen promotion lab cache"        \
1551           " per worker per block size")                                     \
1552                                                                             \
1553   product(bool, CMSOldPLABResizeQuicker, false,                             \
1554           "Whether to react on-the-fly during a scavenge to a sudden"       \
1555           " change in block demand rate")                                   \
1556                                                                             \
1557   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1558           "The tolerance of the phase-change detector for on-the-fly"       \
1559           " PLAB resizing during a scavenge")                               \
1560                                                                             \
1561   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1562           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1563           " during a scavenge")                                             \
1564                                                                             \
1565   product(bool, AlwaysPreTouch, false,                                      \
1566           "It forces all freshly committed pages to be pre-touched.")       \
1567                                                                             \
1568   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1569           "The maximum size of young gen chosen by default per GC worker "  \
1570           "thread available")                                               \
1571                                                                             \
1572   product(bool, CMSIncrementalMode, false,                                  \
1573           "Whether CMS GC should operate in \"incremental\" mode")          \
1574                                                                             \
1575   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1576           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1577           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1578           "value")                                                          \
1579                                                                             \
1580   product(bool, CMSIncrementalPacing, true,                                 \
1581           "Whether the CMS incremental mode duty cycle should be "          \
1582           "automatically adjusted")                                         \
1583                                                                             \
1584   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1585           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1586           "enabled (a percentage, 0-100)")                                  \
1587                                                                             \
1588   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1589           "Percentage (0-100) used to add conservatism when computing the " \
1590           "duty cycle")                                                     \
1591                                                                             \
1592   product(uintx, CMSIncrementalOffset, 0,                                   \
1593           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1594           " is shifted to the right within the period between young GCs")   \
1595                                                                             \
1596   product(uintx, CMSExpAvgFactor, 50,                                       \
1597           "Percentage (0-100) used to weight the current sample when"       \
1598           "computing exponential averages for CMS statistics.")             \
1599                                                                             \
1600   product(uintx, CMS_FLSWeight, 75,                                         \
1601           "Percentage (0-100) used to weight the current sample when"       \
1602           "computing exponentially decating averages for CMS FLS statistics.") \
1603                                                                             \
1604   product(uintx, CMS_FLSPadding, 1,                                         \
1605           "The multiple of deviation from mean to use for buffering"        \
1606           "against volatility in free list demand.")                        \
1607                                                                             \
1608   product(uintx, FLSCoalescePolicy, 2,                                      \
1609           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1610                                                                             \
1611   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1612           "CMS: Larger free blocks are always available for coalescing")    \
1613                                                                             \
1614   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1615           "CMS: the smaller the percentage the greater the coalition force")\
1616                                                                             \
1617   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1618           "CMS: the factor by which to inflate estimated demand of small"   \
1619           " block sizes to prevent coalescing with an adjoining block")     \
1620                                                                             \
1621   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1622           "CMS: the factor by which to inflate estimated demand of large"   \
1623           " block sizes to prevent coalescing with an adjoining block")     \
1624                                                                             \
1625   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1626           "CMS: the factor by which to inflate estimated demand of small"   \
1627           " block sizes to prevent splitting to supply demand for smaller"  \
1628           " blocks")                                                        \
1629                                                                             \
1630   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1631           "CMS: the factor by which to inflate estimated demand of large"   \
1632           " block sizes to prevent splitting to supply demand for smaller"  \
1633           " blocks")                                                        \
1634                                                                             \
1635   product(bool, CMSExtrapolateSweep, false,                                 \
1636           "CMS: cushion for block demand during sweep")                     \
1637                                                                             \
1638   product(uintx, CMS_SweepWeight, 75,                                       \
1639           "Percentage (0-100) used to weight the current sample when "      \
1640           "computing exponentially decaying average for inter-sweep "       \
1641           "duration")                                                       \
1642                                                                             \
1643   product(uintx, CMS_SweepPadding, 1,                                       \
1644           "The multiple of deviation from mean to use for buffering "       \
1645           "against volatility in inter-sweep duration.")                    \
1646                                                                             \
1647   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1648           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1649           "duration exceeds this threhold in milliseconds")                 \
1650                                                                             \
1651   develop(bool, CMSTraceIncrementalMode, false,                             \
1652           "Trace CMS incremental mode")                                     \
1653                                                                             \
1654   develop(bool, CMSTraceIncrementalPacing, false,                           \
1655           "Trace CMS incremental mode pacing computation")                  \
1656                                                                             \
1657   develop(bool, CMSTraceThreadState, false,                                 \
1658           "Trace the CMS thread state (enable the trace_state() method)")   \
1659                                                                             \
1660   product(bool, CMSClassUnloadingEnabled, true,                             \
1661           "Whether class unloading enabled when using CMS GC")              \
1662                                                                             \
1663   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1664           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1665           " for which classes may not be unloaded")                         \
1666                                                                             \
1667   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1668           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1669                                                                             \
1670   product(bool, UseCMSCompactAtFullCollection, true,                        \
1671           "Use mark sweep compact at full collections")                     \
1672                                                                             \
1673   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1674           "Number of CMS full collection done before compaction if > 0")    \
1675                                                                             \
1676   develop(intx, CMSDictionaryChoice, 0,                                     \
1677           "Use BinaryTreeDictionary as default in the CMS generation")      \
1678                                                                             \
1679   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1680           "Replenish an indexed free list with this number of chunks")      \
1681                                                                             \
1682   product(bool, CMSReplenishIntermediate, true,                             \
1683           "Replenish all intermediate free-list caches")                    \
1684                                                                             \
1685   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1686           "When satisfying batched demand, split blocks from the "          \
1687           "IndexedFreeList whose size is a multiple of requested size")     \
1688                                                                             \
1689   product(bool, CMSLoopWarn, false,                                         \
1690           "Warn in case of excessive CMS looping")                          \
1691                                                                             \
1692   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1693           "Whether preserved marks should be restored early")               \
1694                                                                             \
1695   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1696           "Size of marking stack")                                          \
1697                                                                             \
1698   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1699           "Max size of marking stack")                                      \
1700                                                                             \
1701   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1702           "Whether we should simulate frequent marking stack / work queue"  \
1703           " overflow")                                                      \
1704                                                                             \
1705   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1706           "An `interval' counter that determines how frequently"            \
1707           " we simulate overflow; a smaller number increases frequency")    \
1708                                                                             \
1709   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1710           "(Temporary, subject to experimentation)"                         \
1711           "Maximum number of abortable preclean iterations, if > 0")        \
1712                                                                             \
1713   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1714           "(Temporary, subject to experimentation)"                         \
1715           "Maximum time in abortable preclean in ms")                       \
1716                                                                             \
1717   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1718           "(Temporary, subject to experimentation)"                         \
1719           "Nominal minimum work per abortable preclean iteration")          \
1720                                                                             \
1721   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1722           "(Temporary, subject to experimentation)"                         \
1723           " Time that we sleep between iterations when not given"           \
1724           " enough work per iteration")                                     \
1725                                                                             \
1726   product(uintx, CMSRescanMultiple, 32,                                     \
1727           "Size (in cards) of CMS parallel rescan task")                    \
1728                                                                             \
1729   product(uintx, CMSConcMarkMultiple, 32,                                   \
1730           "Size (in cards) of CMS concurrent MT marking task")              \
1731                                                                             \
1732   product(bool, CMSAbortSemantics, false,                                   \
1733           "Whether abort-on-overflow semantics is implemented")             \
1734                                                                             \
1735   product(bool, CMSParallelInitialMarkEnabled, true,                        \
1736           "Use the parallel initial mark.")                                 \
1737                                                                             \
1738   product(bool, CMSParallelRemarkEnabled, true,                             \
1739           "Whether parallel remark enabled (only if ParNewGC)")             \
1740                                                                             \
1741   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1742           "Whether parallel remark of survivor space"                       \
1743           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1744                                                                             \
1745   product(bool, CMSPLABRecordAlways, true,                                  \
1746           "Whether to always record survivor space PLAB bdries"             \
1747           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1748                                                                             \
1749   product(bool, CMSEdenChunksRecordAlways, true,                            \
1750           "Whether to always record eden chunks used for "                  \
1751           "the parallel initial mark or remark of eden" )                   \
1752                                                                             \
1753   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1754           "Print the eden and the survivor chunks used for the parallel "   \
1755           "initial mark or remark of the eden/survivor spaces")             \
1756                                                                             \
1757   product(bool, CMSConcurrentMTEnabled, true,                               \
1758           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1759                                                                             \
1760   product(bool, CMSPrecleaningEnabled, true,                                \
1761           "Whether concurrent precleaning enabled")                         \
1762                                                                             \
1763   product(uintx, CMSPrecleanIter, 3,                                        \
1764           "Maximum number of precleaning iteration passes")                 \
1765                                                                             \
1766   product(uintx, CMSPrecleanNumerator, 2,                                   \
1767           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1768           " ratio")                                                         \
1769                                                                             \
1770   product(uintx, CMSPrecleanDenominator, 3,                                 \
1771           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1772           " ratio")                                                         \
1773                                                                             \
1774   product(bool, CMSPrecleanRefLists1, true,                                 \
1775           "Preclean ref lists during (initial) preclean phase")             \
1776                                                                             \
1777   product(bool, CMSPrecleanRefLists2, false,                                \
1778           "Preclean ref lists during abortable preclean phase")             \
1779                                                                             \
1780   product(bool, CMSPrecleanSurvivors1, false,                               \
1781           "Preclean survivors during (initial) preclean phase")             \
1782                                                                             \
1783   product(bool, CMSPrecleanSurvivors2, true,                                \
1784           "Preclean survivors during abortable preclean phase")             \
1785                                                                             \
1786   product(uintx, CMSPrecleanThreshold, 1000,                                \
1787           "Don't re-iterate if #dirty cards less than this")                \
1788                                                                             \
1789   product(bool, CMSCleanOnEnter, true,                                      \
1790           "Clean-on-enter optimization for reducing number of dirty cards") \
1791                                                                             \
1792   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1793           "Choose variant (1,2) of verification following remark")          \
1794                                                                             \
1795   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1796           "If Eden used is below this value, don't try to schedule remark") \
1797                                                                             \
1798   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1799           "The Eden occupancy % at which to try and schedule remark pause") \
1800                                                                             \
1801   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1802           "Start sampling Eden top at least before yg occupancy reaches"    \
1803           " 1/<ratio> of the size at which we plan to schedule remark")     \
1804                                                                             \
1805   product(uintx, CMSSamplingGrain, 16*K,                                    \
1806           "The minimum distance between eden samples for CMS (see above)")  \
1807                                                                             \
1808   product(bool, CMSScavengeBeforeRemark, false,                             \
1809           "Attempt scavenge before the CMS remark step")                    \
1810                                                                             \
1811   develop(bool, CMSTraceSweeper, false,                                     \
1812           "Trace some actions of the CMS sweeper")                          \
1813                                                                             \
1814   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1815           "Don't drain below this size per parallel worker/thief")          \
1816                                                                             \
1817   manageable(intx, CMSWaitDuration, 2000,                                   \
1818           "Time in milliseconds that CMS thread waits for young GC")        \
1819                                                                             \
1820   develop(uintx, CMSCheckInterval, 1000,                                    \
1821           "Interval in milliseconds that CMS thread checks if it "          \
1822           "should start a collection cycle")                                \
1823                                                                             \
1824   product(bool, CMSYield, true,                                             \
1825           "Yield between steps of concurrent mark & sweep")                 \
1826                                                                             \
1827   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1828           "Bitmap operations should process at most this many bits"         \
1829           "between yields")                                                 \
1830                                                                             \
1831   product(bool, CMSDumpAtPromotionFailure, false,                           \
1832           "Dump useful information about the state of the CMS old "         \
1833           " generation upon a promotion failure.")                          \
1834                                                                             \
1835   product(bool, CMSPrintChunksInDump, false,                                \
1836           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1837           " more detailed information about the free chunks.")              \
1838                                                                             \
1839   product(bool, CMSPrintObjectsInDump, false,                               \
1840           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1841           " more detailed information about the allocated objects.")        \
1842                                                                             \
1843   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1844           "Verify that all refs across the FLS boundary "                   \
1845           " are to valid objects")                                          \
1846                                                                             \
1847   diagnostic(bool, FLSVerifyLists, false,                                   \
1848           "Do lots of (expensive) FreeListSpace verification")              \
1849                                                                             \
1850   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1851           "Do lots of (expensive) FLS index table verification")            \
1852                                                                             \
1853   develop(bool, FLSVerifyDictionary, false,                                 \
1854           "Do lots of (expensive) FLS dictionary verification")             \
1855                                                                             \
1856   develop(bool, VerifyBlockOffsetArray, false,                              \
1857           "Do (expensive!) block offset array verification")                \
1858                                                                             \
1859   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1860           "Maintain _unallocated_block in BlockOffsetArray"                 \
1861           " (currently applicable only to CMS collector)")                  \
1862                                                                             \
1863   develop(bool, TraceCMSState, false,                                       \
1864           "Trace the state of the CMS collection")                          \
1865                                                                             \
1866   product(intx, RefDiscoveryPolicy, 0,                                      \
1867           "Whether reference-based(0) or referent-based(1)")                \
1868                                                                             \
1869   product(bool, ParallelRefProcEnabled, false,                              \
1870           "Enable parallel reference processing whenever possible")         \
1871                                                                             \
1872   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1873           "Enable balancing of reference processing queues")                \
1874                                                                             \
1875   product(uintx, CMSTriggerRatio, 80,                                       \
1876           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1877           "allocated before a CMS collection cycle commences")              \
1878                                                                             \
1879   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1880           "Percentage CMS generation occupancy at which to "                \
1881           "initiate CMS collection for bootstrapping collection stats")     \
1882                                                                             \
1883   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1884           "Percentage CMS generation occupancy to start a CMS collection "  \
1885           "cycle. A negative value means that CMSTriggerRatio is used")     \
1886                                                                             \
1887   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1888           "Percentage of the (entire) heap occupancy to start a "           \
1889           "concurrent GC cycle. It is used by GCs that trigger a "          \
1890           "concurrent GC cycle based on the occupancy of the entire heap, " \
1891           "not just one of the generations (e.g., G1). A value of 0 "       \
1892           "denotes 'do constant GC cycles'.")                               \
1893                                                                             \
1894   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1895           "Only use occupancy as a crierion for starting a CMS collection") \
1896                                                                             \
1897   product(uintx, CMSIsTooFullPercentage, 98,                                \
1898           "An absolute ceiling above which CMS will always consider the "   \
1899           "unloading of classes when class unloading is enabled")           \
1900                                                                             \
1901   develop(bool, CMSTestInFreeList, false,                                   \
1902           "Check if the coalesced range is already in the "                 \
1903           "free lists as claimed")                                          \
1904                                                                             \
1905   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1906           "Check that all the garbage collected was returned to the "       \
1907           "free lists.")                                                    \
1908                                                                             \
1909   notproduct(bool, ScavengeALot, false,                                     \
1910           "Force scavenge at every Nth exit from the runtime system "       \
1911           "(N=ScavengeALotInterval)")                                       \
1912                                                                             \
1913   develop(bool, FullGCALot, false,                                          \
1914           "Force full gc at every Nth exit from the runtime system "        \
1915           "(N=FullGCALotInterval)")                                         \
1916                                                                             \
1917   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1918           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1919                                                                             \
1920   product(bool, PrintPromotionFailure, false,                               \
1921           "Print additional diagnostic information following "              \
1922           " promotion failure")                                             \
1923                                                                             \
1924   notproduct(bool, PromotionFailureALot, false,                             \
1925           "Use promotion failure handling on every youngest generation "    \
1926           "collection")                                                     \
1927                                                                             \
1928   develop(uintx, PromotionFailureALotCount, 1000,                           \
1929           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1930           "refill attempts (ParNew) or promotion attempts "                 \
1931           "(other young collectors) ")                                      \
1932                                                                             \
1933   develop(uintx, PromotionFailureALotInterval, 5,                           \
1934           "Total collections between promotion failures alot")              \
1935                                                                             \
1936   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1937           "Sleep time when sleep is used for yields")                       \
1938                                                                             \
1939   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1940           "Number of yields before a sleep is done during workstealing")    \
1941                                                                             \
1942   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1943           "Number of iterations in a spin loop between checks on "          \
1944           "time out of hard spin")                                          \
1945                                                                             \
1946   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1947           "Ratio of hard spins to calls to yield")                          \
1948                                                                             \
1949   develop(uintx, ObjArrayMarkingStride, 512,                                \
1950           "Number of ObjArray elements to push onto the marking stack"      \
1951           "before pushing a continuation entry")                            \
1952                                                                             \
1953   develop(bool, MetadataAllocationFailALot, false,                          \
1954           "Fail metadata allocations at intervals controlled by "           \
1955           "MetadataAllocationFailALotInterval")                             \
1956                                                                             \
1957   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1958           "metadata allocation failure alot interval")                      \
1959                                                                             \
1960   develop(bool, MetaDataDeallocateALot, false,                              \
1961           "Deallocation bunches of metadata at intervals controlled by "    \
1962           "MetaDataAllocateALotInterval")                                   \
1963                                                                             \
1964   develop(uintx, MetaDataDeallocateALotInterval, 100,                       \
1965           "Metadata deallocation alot interval")                            \
1966                                                                             \
1967   develop(bool, TraceMetadataChunkAllocation, false,                        \
1968           "Trace chunk metadata allocations")                               \
1969                                                                             \
1970   product(bool, TraceMetadataHumongousAllocation, false,                    \
1971           "Trace humongous metadata allocations")                           \
1972                                                                             \
1973   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1974           "Trace virtual space metadata allocations")                       \
1975                                                                             \
1976   notproduct(bool, ExecuteInternalVMTests, false,                           \
1977           "Enable execution of internal VM tests.")                         \
1978                                                                             \
1979   notproduct(bool, VerboseInternalVMTests, false,                           \
1980           "Turn on logging for internal VM tests.")                         \
1981                                                                             \
1982   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1983                                                                             \
1984   product_pd(bool, ResizeTLAB,                                              \
1985           "Dynamically resize tlab size for threads")                       \
1986                                                                             \
1987   product(bool, ZeroTLAB, false,                                            \
1988           "Zero out the newly created TLAB")                                \
1989                                                                             \
1990   product(bool, FastTLABRefill, true,                                       \
1991           "Use fast TLAB refill code")                                      \
1992                                                                             \
1993   product(bool, PrintTLAB, false,                                           \
1994           "Print various TLAB related information")                         \
1995                                                                             \
1996   product(bool, TLABStats, true,                                            \
1997           "Print various TLAB related information")                         \
1998                                                                             \
1999   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
2000           "Enable LowMemoryProtection"))                                    \
2001                                                                             \
2002   product_pd(bool, NeverActAsServerClassMachine,                            \
2003           "Never act like a server-class machine")                          \
2004                                                                             \
2005   product(bool, AlwaysActAsServerClassMachine, false,                       \
2006           "Always act like a server-class machine")                         \
2007                                                                             \
2008   product_pd(uint64_t, MaxRAM,                                              \
2009           "Real memory size (in bytes) used to set maximum heap size")      \
2010                                                                             \
2011   product(uintx, ErgoHeapSizeLimit, 0,                                      \
2012           "Maximum ergonomically set heap size (in bytes); zero means use " \
2013           "MaxRAM / MaxRAMFraction")                                        \
2014                                                                             \
2015   product(uintx, MaxRAMFraction, 4,                                         \
2016           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2017           "size")                                                           \
2018                                                                             \
2019   product(uintx, DefaultMaxRAMFraction, 4,                                  \
2020           "Maximum fraction (1/n) of real memory used for maximum heap "    \
2021           "size; deprecated: to be renamed to MaxRAMFraction")              \
2022                                                                             \
2023   product(uintx, MinRAMFraction, 2,                                         \
2024           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
2025           "size on systems with small physical memory size")                \
2026                                                                             \
2027   product(uintx, InitialRAMFraction, 64,                                    \
2028           "Fraction (1/n) of real memory used for initial heap size")       \
2029                                                                             \
2030   develop(uintx, MaxVirtMemFraction, 2,                                     \
2031           "Maximum fraction (1/n) of virtual memory used for ergonomically" \
2032           "determining maximum heap size")                                  \
2033                                                                             \
2034   product(bool, UseAutoGCSelectPolicy, false,                               \
2035           "Use automatic collection selection policy")                      \
2036                                                                             \
2037   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
2038           "Automatic GC selection pause threshhold in ms")                  \
2039                                                                             \
2040   product(bool, UseAdaptiveSizePolicy, true,                                \
2041           "Use adaptive generation sizing policies")                        \
2042                                                                             \
2043   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2044           "Use adaptive survivor sizing policies")                          \
2045                                                                             \
2046   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2047           "Use adaptive young-old sizing policies at minor collections")    \
2048                                                                             \
2049   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2050           "Use adaptive young-old sizing policies at major collections")    \
2051                                                                             \
2052   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2053           "Use statistics from System.GC for adaptive size policy")         \
2054                                                                             \
2055   product(bool, UseAdaptiveGCBoundary, false,                               \
2056           "Allow young-old boundary to move")                               \
2057                                                                             \
2058   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2059           "Trace young-old boundary moves")                                 \
2060                                                                             \
2061   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2062           "Resize the virtual spaces of the young or old generations")      \
2063                                                                             \
2064   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2065           "Policy for changeing generation size for throughput goals")      \
2066                                                                             \
2067   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2068           "Policy for changing generation size for pause goals")            \
2069                                                                             \
2070   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2071           "Adjust tenured generation to achive a minor pause goal")         \
2072                                                                             \
2073   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2074           "Adjust young generation to achive a major pause goal")           \
2075                                                                             \
2076   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2077           "Number of steps where heuristics is used before data is used")   \
2078                                                                             \
2079   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2080           "Number of collections before the adaptive sizing is started")    \
2081                                                                             \
2082   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2083           "Collection interval for printing information; zero means never") \
2084                                                                             \
2085   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2086           "Use adaptive minimum footprint as a goal")                       \
2087                                                                             \
2088   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2089           "Weight given to exponential resizing, between 0 and 100")        \
2090                                                                             \
2091   product(uintx, AdaptiveTimeWeight,       25,                              \
2092           "Weight given to time in adaptive policy, between 0 and 100")     \
2093                                                                             \
2094   product(uintx, PausePadding, 1,                                           \
2095           "How much buffer to keep for pause time")                         \
2096                                                                             \
2097   product(uintx, PromotedPadding, 3,                                        \
2098           "How much buffer to keep for promotion failure")                  \
2099                                                                             \
2100   product(uintx, SurvivorPadding, 3,                                        \
2101           "How much buffer to keep for survivor overflow")                  \
2102                                                                             \
2103   product(uintx, ThresholdTolerance, 10,                                    \
2104           "Allowed collection cost difference between generations")         \
2105                                                                             \
2106   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2107           "If collection costs are within margin, reduce both by full "     \
2108           "delta")                                                          \
2109                                                                             \
2110   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2111           "Adaptive size percentage change in young generation")            \
2112                                                                             \
2113   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2114           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2115                                                                             \
2116   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2117           "Decay factor to YoungedGenerationSizeSupplement")                \
2118                                                                             \
2119   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2120           "Adaptive size percentage change in tenured generation")          \
2121                                                                             \
2122   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2123           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2124                                                                             \
2125   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2126           "Decay factor to TenuredGenerationSizeIncrement")                 \
2127                                                                             \
2128   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2129           "Adaptive size policy maximum GC pause time goal in msec, "       \
2130           "or (G1 Only) the max. GC time per MMU time slice")               \
2131                                                                             \
2132   product(uintx, GCPauseIntervalMillis, 0,                                  \
2133           "Time slice for MMU specification")                               \
2134                                                                             \
2135   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2136           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2137                                                                             \
2138   product(uintx, GCTimeRatio, 99,                                           \
2139           "Adaptive size policy application time to GC time ratio")         \
2140                                                                             \
2141   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2142           "Adaptive size scale down factor for shrinking")                  \
2143                                                                             \
2144   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2145           "Adaptive size decays the major cost for long major intervals")   \
2146                                                                             \
2147   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2148           "Time scale over which major costs decay")                        \
2149                                                                             \
2150   product(uintx, MinSurvivorRatio, 3,                                       \
2151           "Minimum ratio of young generation/survivor space size")          \
2152                                                                             \
2153   product(uintx, InitialSurvivorRatio, 8,                                   \
2154           "Initial ratio of eden/survivor space size")                      \
2155                                                                             \
2156   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2157           "Estimate of footprint other than Java Heap")                     \
2158                                                                             \
2159   product(bool, UseGCOverheadLimit, true,                                   \
2160           "Use policy to limit of proportion of time spent in GC "          \
2161           "before an OutOfMemory error is thrown")                          \
2162                                                                             \
2163   product(uintx, GCTimeLimit, 98,                                           \
2164           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2165           "error is thrown (used with GCHeapFreeLimit)")                    \
2166                                                                             \
2167   product(uintx, GCHeapFreeLimit, 2,                                        \
2168           "Minimum percentage of free space after a full GC before an "     \
2169           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2170                                                                             \
2171   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2172           "Number of consecutive collections before gc time limit fires")   \
2173                                                                             \
2174   product(bool, PrintAdaptiveSizePolicy, false,                             \
2175           "Print information about AdaptiveSizePolicy")                     \
2176                                                                             \
2177   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2178           "How far ahead to prefetch destination area (<= 0 means off)")    \
2179                                                                             \
2180   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2181           "How far ahead to prefetch scan area (<= 0 means off)")           \
2182                                                                             \
2183   product(intx, PrefetchFieldsAhead, -1,                                    \
2184           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2185                                                                             \
2186   diagnostic(bool, VerifySilently, false,                                   \
2187           "Don't print print the verification progress")                    \
2188                                                                             \
2189   diagnostic(bool, VerifyDuringStartup, false,                              \
2190           "Verify memory system before executing any Java code "            \
2191           "during VM initialization")                                       \
2192                                                                             \
2193   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2194           "Verify system before exiting")                                   \
2195                                                                             \
2196   diagnostic(bool, VerifyBeforeGC, false,                                   \
2197           "Verify memory system before GC")                                 \
2198                                                                             \
2199   diagnostic(bool, VerifyAfterGC, false,                                    \
2200           "Verify memory system after GC")                                  \
2201                                                                             \
2202   diagnostic(bool, VerifyDuringGC, false,                                   \
2203           "Verify memory system during GC (between phases)")                \
2204                                                                             \
2205   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2206           "Enable parallel memory system verification")                     \
2207                                                                             \
2208   diagnostic(bool, DeferInitialCardMark, false,                             \
2209           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2210            "may arise from new_pre_store_barrier")                          \
2211                                                                             \
2212   diagnostic(bool, VerifyRememberedSets, false,                             \
2213           "Verify GC remembered sets")                                      \
2214                                                                             \
2215   diagnostic(bool, VerifyObjectStartArray, true,                            \
2216           "Verify GC object start array if verify before/after")            \
2217                                                                             \
2218   product(bool, DisableExplicitGC, false,                                   \
2219           "Tells whether calling System.gc() does a full GC")               \
2220                                                                             \
2221   notproduct(bool, CheckMemoryInitialization, false,                        \
2222           "Checks memory initialization")                                   \
2223                                                                             \
2224   product(bool, CollectGen0First, false,                                    \
2225           "Collect youngest generation before each full GC")                \
2226                                                                             \
2227   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2228           "Bind CMS Thread to CPU if possible")                             \
2229                                                                             \
2230   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2231           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2232                                                                             \
2233   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2234           "Bind GCTaskThreads to CPUs if possible")                         \
2235                                                                             \
2236   product(bool, UseGCTaskAffinity, false,                                   \
2237           "Use worker affinity when asking for GCTasks")                    \
2238                                                                             \
2239   product(uintx, ProcessDistributionStride, 4,                              \
2240           "Stride through processors when distributing processes")          \
2241                                                                             \
2242   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2243           "number of times the coordinator GC thread will sleep while "     \
2244           "yielding before giving up and resuming GC")                      \
2245                                                                             \
2246   product(uintx, CMSYieldSleepCount, 0,                                     \
2247           "number of times a GC thread (minus the coordinator) "            \
2248           "will sleep while yielding before giving up and resuming GC")     \
2249                                                                             \
2250   /* gc tracing */                                                          \
2251   manageable(bool, PrintGC, false,                                          \
2252           "Print message at garbage collect")                               \
2253                                                                             \
2254   manageable(bool, PrintGCDetails, false,                                   \
2255           "Print more details at garbage collect")                          \
2256                                                                             \
2257   manageable(bool, PrintGCDateStamps, false,                                \
2258           "Print date stamps at garbage collect")                           \
2259                                                                             \
2260   manageable(bool, PrintGCTimeStamps, false,                                \
2261           "Print timestamps at garbage collect")                            \
2262                                                                             \
2263   product(bool, PrintGCTaskTimeStamps, false,                               \
2264           "Print timestamps for individual gc worker thread tasks")         \
2265                                                                             \
2266   develop(intx, ConcGCYieldTimeout, 0,                                      \
2267           "If non-zero, assert that GC threads yield within this # of ms.") \
2268                                                                             \
2269   notproduct(bool, TraceMarkSweep, false,                                   \
2270           "Trace mark sweep")                                               \
2271                                                                             \
2272   product(bool, PrintReferenceGC, false,                                    \
2273           "Print times spent handling reference objects during GC "         \
2274           " (enabled only when PrintGCDetails)")                            \
2275                                                                             \
2276   develop(bool, TraceReferenceGC, false,                                    \
2277           "Trace handling of soft/weak/final/phantom references")           \
2278                                                                             \
2279   develop(bool, TraceFinalizerRegistration, false,                          \
2280          "Trace registration of final references")                          \
2281                                                                             \
2282   notproduct(bool, TraceScavenge, false,                                    \
2283           "Trace scavenge")                                                 \
2284                                                                             \
2285   product_rw(bool, TraceClassLoading, false,                                \
2286           "Trace all classes loaded")                                       \
2287                                                                             \
2288   product(bool, TraceClassLoadingPreorder, false,                           \
2289           "Trace all classes loaded in order referenced (not loaded)")      \
2290                                                                             \
2291   product_rw(bool, TraceClassUnloading, false,                              \
2292           "Trace unloading of classes")                                     \
2293                                                                             \
2294   product_rw(bool, TraceLoaderConstraints, false,                           \
2295           "Trace loader constraints")                                       \
2296                                                                             \
2297   develop(bool, TraceClassLoaderData, false,                                \
2298           "Trace class loader loader_data lifetime")                        \
2299                                                                             \
2300   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2301           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2302           "Initial size of the boot class loader data metaspace")           \
2303                                                                             \
2304   product(bool, TraceGen0Time, false,                                       \
2305           "Trace accumulated time for Gen 0 collection")                    \
2306                                                                             \
2307   product(bool, TraceGen1Time, false,                                       \
2308           "Trace accumulated time for Gen 1 collection")                    \
2309                                                                             \
2310   product(bool, PrintTenuringDistribution, false,                           \
2311           "Print tenuring age information")                                 \
2312                                                                             \
2313   product_rw(bool, PrintHeapAtGC, false,                                    \
2314           "Print heap layout before and after each GC")                     \
2315                                                                             \
2316   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2317           "Prints extended information about the layout of the heap "       \
2318           "when -XX:+PrintHeapAtGC is set")                                 \
2319                                                                             \
2320   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2321           "Print heap layout in response to SIGBREAK")                      \
2322                                                                             \
2323   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2324           "Print a class histogram before any major stop-world GC")         \
2325                                                                             \
2326   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2327           "Print a class histogram after any major stop-world GC")          \
2328                                                                             \
2329   manageable(bool, PrintClassHistogram, false,                              \
2330           "Print a histogram of class instances")                           \
2331                                                                             \
2332   develop(bool, TraceWorkGang, false,                                       \
2333           "Trace activities of work gangs")                                 \
2334                                                                             \
2335   product(bool, TraceParallelOldGCTasks, false,                             \
2336           "Trace multithreaded GC activity")                                \
2337                                                                             \
2338   develop(bool, TraceBlockOffsetTable, false,                               \
2339           "Print BlockOffsetTable maps")                                    \
2340                                                                             \
2341   develop(bool, TraceCardTableModRefBS, false,                              \
2342           "Print CardTableModRefBS maps")                                   \
2343                                                                             \
2344   develop(bool, TraceGCTaskManager, false,                                  \
2345           "Trace actions of the GC task manager")                           \
2346                                                                             \
2347   develop(bool, TraceGCTaskQueue, false,                                    \
2348           "Trace actions of the GC task queues")                            \
2349                                                                             \
2350   diagnostic(bool, TraceGCTaskThread, false,                                \
2351           "Trace actions of the GC task threads")                           \
2352                                                                             \
2353   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2354           "Print the time taken by each parallel old gc phase."             \
2355           "PrintGCDetails must also be enabled.")                           \
2356                                                                             \
2357   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2358           "Trace parallel old gc marking phase")                            \
2359                                                                             \
2360   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2361           "Trace parallel old gc summary phase")                            \
2362                                                                             \
2363   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2364           "Trace parallel old gc compaction phase")                         \
2365                                                                             \
2366   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2367           "Trace parallel old gc dense prefix computation")                 \
2368                                                                             \
2369   develop(bool, IgnoreLibthreadGPFault, false,                              \
2370           "Suppress workaround for libthread GP fault")                     \
2371                                                                             \
2372   product(bool, PrintJNIGCStalls, false,                                    \
2373           "Print diagnostic message when GC is stalled"                     \
2374           "by JNI critical section")                                        \
2375                                                                             \
2376   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2377           "The percentage of the used heap that the instances of a class "  \
2378           "must occupy for the class to generate a trace event.")           \
2379                                                                             \
2380   /* GC log rotation setting */                                             \
2381                                                                             \
2382   product(bool, UseGCLogFileRotation, false,                                \
2383           "Prevent large gclog file for long running app. "                 \
2384           "Requires -Xloggc:<filename>")                                    \
2385                                                                             \
2386   product(uintx, NumberOfGCLogFiles, 0,                                     \
2387           "Number of gclog files in rotation, "                             \
2388           "Default: 0, no rotation")                                        \
2389                                                                             \
2390   product(uintx, GCLogFileSize, 0,                                          \
2391           "GC log file size, Default: 0 bytes, no rotation "                \
2392           "Only valid with UseGCLogFileRotation")                           \
2393                                                                             \
2394   /* JVMTI heap profiling */                                                \
2395                                                                             \
2396   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2397           "Trace JVMTI object tagging calls")                               \
2398                                                                             \
2399   diagnostic(bool, VerifyBeforeIteration, false,                            \
2400           "Verify memory system before JVMTI iteration")                    \
2401                                                                             \
2402   /* compiler interface */                                                  \
2403                                                                             \
2404   develop(bool, CIPrintCompilerName, false,                                 \
2405           "when CIPrint is active, print the name of the active compiler")  \
2406                                                                             \
2407   develop(bool, CIPrintCompileQueue, false,                                 \
2408           "display the contents of the compile queue whenever a "           \
2409           "compilation is enqueued")                                        \
2410                                                                             \
2411   develop(bool, CIPrintRequests, false,                                     \
2412           "display every request for compilation")                          \
2413                                                                             \
2414   product(bool, CITime, false,                                              \
2415           "collect timing information for compilation")                     \
2416                                                                             \
2417   develop(bool, CITimeEach, false,                                          \
2418           "display timing information after each successful compilation")   \
2419                                                                             \
2420   develop(bool, CICountOSR, false,                                          \
2421           "use a separate counter when assigning ids to osr compilations")  \
2422                                                                             \
2423   develop(bool, CICompileNatives, true,                                     \
2424           "compile native methods if supported by the compiler")            \
2425                                                                             \
2426   develop_pd(bool, CICompileOSR,                                            \
2427           "compile on stack replacement methods if supported by the "       \
2428           "compiler")                                                       \
2429                                                                             \
2430   develop(bool, CIPrintMethodCodes, false,                                  \
2431           "print method bytecodes of the compiled code")                    \
2432                                                                             \
2433   develop(bool, CIPrintTypeFlow, false,                                     \
2434           "print the results of ciTypeFlow analysis")                       \
2435                                                                             \
2436   develop(bool, CITraceTypeFlow, false,                                     \
2437           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2438                                                                             \
2439   develop(intx, OSROnlyBCI, -1,                                             \
2440           "OSR only at this bci.  Negative values mean exclude that bci")   \
2441                                                                             \
2442   /* compiler */                                                            \
2443                                                                             \
2444   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2445           "Number of compiler threads to run")                              \
2446                                                                             \
2447   product(intx, CompilationPolicyChoice, 0,                                 \
2448           "which compilation policy (0/1)")                                 \
2449                                                                             \
2450   develop(bool, UseStackBanging, true,                                      \
2451           "use stack banging for stack overflow checks (required for "      \
2452           "proper StackOverflow handling; disable only to measure cost "    \
2453           "of stackbanging)")                                               \
2454                                                                             \
2455   develop(bool, UseStrictFP, true,                                          \
2456           "use strict fp if modifier strictfp is set")                      \
2457                                                                             \
2458   develop(bool, GenerateSynchronizationCode, true,                          \
2459           "generate locking/unlocking code for synchronized methods and "   \
2460           "monitors")                                                       \
2461                                                                             \
2462   develop(bool, GenerateCompilerNullChecks, true,                           \
2463           "Generate explicit null checks for loads/stores/calls")           \
2464                                                                             \
2465   develop(bool, GenerateRangeChecks, true,                                  \
2466           "Generate range checks for array accesses")                       \
2467                                                                             \
2468   develop_pd(bool, ImplicitNullChecks,                                      \
2469           "generate code for implicit null checks")                         \
2470                                                                             \
2471   product(bool, PrintSafepointStatistics, false,                            \
2472           "print statistics about safepoint synchronization")               \
2473                                                                             \
2474   product(intx, PrintSafepointStatisticsCount, 300,                         \
2475           "total number of safepoint statistics collected "                 \
2476           "before printing them out")                                       \
2477                                                                             \
2478   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2479           "print safepoint statistics only when safepoint takes"            \
2480           " more than PrintSafepointSatisticsTimeout in millis")            \
2481                                                                             \
2482   product(bool, TraceSafepointCleanupTime, false,                           \
2483           "print the break down of clean up tasks performed during"         \
2484           " safepoint")                                                     \
2485                                                                             \
2486   product(bool, Inline, true,                                               \
2487           "enable inlining")                                                \
2488                                                                             \
2489   product(bool, ClipInlining, true,                                         \
2490           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2491                                                                             \
2492   develop(bool, UseCHA, true,                                               \
2493           "enable CHA")                                                     \
2494                                                                             \
2495   product(bool, UseTypeProfile, true,                                       \
2496           "Check interpreter profile for historically monomorphic calls")   \
2497                                                                             \
2498   notproduct(bool, TimeCompiler, false,                                     \
2499           "time the compiler")                                              \
2500                                                                             \
2501   diagnostic(bool, PrintInlining, false,                                    \
2502           "prints inlining optimizations")                                  \
2503                                                                             \
2504   product(bool, UsePopCountInstruction, false,                              \
2505           "Use population count instruction")                               \
2506                                                                             \
2507   develop(bool, EagerInitialization, false,                                 \
2508           "Eagerly initialize classes if possible")                         \
2509                                                                             \
2510   develop(bool, TraceMethodReplacement, false,                              \
2511           "Print when methods are replaced do to recompilation")            \
2512                                                                             \
2513   develop(bool, PrintMethodFlushing, false,                                 \
2514           "print the nmethods being flushed")                               \
2515                                                                             \
2516   develop(bool, UseRelocIndex, false,                                       \
2517          "use an index to speed random access to relocations")              \
2518                                                                             \
2519   develop(bool, StressCodeBuffers, false,                                   \
2520          "Exercise code buffer expansion and other rare state changes")     \
2521                                                                             \
2522   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2523          "Generate extra debugging info for non-safepoints in nmethods")    \
2524                                                                             \
2525   product(bool, PrintVMOptions, false,                                      \
2526          "Print flags that appeared on the command line")                   \
2527                                                                             \
2528   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2529          "Ignore unrecognized VM options")                                  \
2530                                                                             \
2531   product(bool, PrintCommandLineFlags, false,                               \
2532          "Print flags specified on command line or set by ergonomics")      \
2533                                                                             \
2534   product(bool, PrintFlagsInitial, false,                                   \
2535          "Print all VM flags before argument processing and exit VM")       \
2536                                                                             \
2537   product(bool, PrintFlagsFinal, false,                                     \
2538          "Print all VM flags after argument and ergonomic processing")      \
2539                                                                             \
2540   notproduct(bool, PrintFlagsWithComments, false,                           \
2541          "Print all VM flags with default values and descriptions and exit")\
2542                                                                             \
2543   diagnostic(bool, SerializeVMOutput, true,                                 \
2544          "Use a mutex to serialize output to tty and LogFile")              \
2545                                                                             \
2546   diagnostic(bool, DisplayVMOutput, true,                                   \
2547          "Display all VM output on the tty, independently of LogVMOutput")  \
2548                                                                             \
2549   diagnostic(bool, LogVMOutput, false,                                      \
2550          "Save VM output to LogFile")                                       \
2551                                                                             \
2552   diagnostic(ccstr, LogFile, NULL,                                          \
2553          "If LogVMOutput or LogCompilation is on, save VM output to "       \
2554          "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)") \
2555                                                                             \
2556   product(ccstr, ErrorFile, NULL,                                           \
2557          "If an error occurs, save the error data to this file "            \
2558          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2559                                                                             \
2560   product(bool, DisplayVMOutputToStderr, false,                             \
2561          "If DisplayVMOutput is true, display all VM output to stderr")     \
2562                                                                             \
2563   product(bool, DisplayVMOutputToStdout, false,                             \
2564          "If DisplayVMOutput is true, display all VM output to stdout")     \
2565                                                                             \
2566   product(bool, UseHeavyMonitors, false,                                    \
2567           "use heavyweight instead of lightweight Java monitors")           \
2568                                                                             \
2569   product(bool, PrintStringTableStatistics, false,                          \
2570           "print statistics about the StringTable and SymbolTable")         \
2571                                                                             \
2572   diagnostic(bool, VerifyStringTableAtExit, false,                          \
2573           "verify StringTable contents at exit")                            \
2574                                                                             \
2575   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2576           "print histogram of the symbol table")                            \
2577                                                                             \
2578   notproduct(bool, ExitVMOnVerifyError, false,                              \
2579           "standard exit from VM if bytecode verify error "                 \
2580           "(only in debug mode)")                                           \
2581                                                                             \
2582   notproduct(ccstr, AbortVMOnException, NULL,                               \
2583           "Call fatal if this exception is thrown.  Example: "              \
2584           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2585                                                                             \
2586   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2587           "Call fatal if the exception pointed by AbortVMOnException "      \
2588           "has this message.")                                              \
2589                                                                             \
2590   develop(bool, DebugVtables, false,                                        \
2591           "add debugging code to vtable dispatch")                          \
2592                                                                             \
2593   develop(bool, PrintVtables, false,                                        \
2594           "print vtables when printing klass")                              \
2595                                                                             \
2596   notproduct(bool, PrintVtableStats, false,                                 \
2597           "print vtables stats at end of run")                              \
2598                                                                             \
2599   develop(bool, TraceCreateZombies, false,                                  \
2600           "trace creation of zombie nmethods")                              \
2601                                                                             \
2602   notproduct(bool, IgnoreLockingAssertions, false,                          \
2603           "disable locking assertions (for speed)")                         \
2604                                                                             \
2605   product(bool, RangeCheckElimination, true,                                \
2606           "Eliminate range checks")                                         \
2607                                                                             \
2608   develop_pd(bool, UncommonNullCast,                                        \
2609           "track occurrences of null in casts; adjust compiler tactics")    \
2610                                                                             \
2611   develop(bool, TypeProfileCasts,  true,                                    \
2612           "treat casts like calls for purposes of type profiling")          \
2613                                                                             \
2614   develop(bool, DelayCompilationDuringStartup, true,                        \
2615           "Delay invoking the compiler until main application class is "    \
2616           "loaded")                                                         \
2617                                                                             \
2618   develop(bool, CompileTheWorld, false,                                     \
2619           "Compile all methods in all classes in bootstrap class path "     \
2620           "(stress test)")                                                  \
2621                                                                             \
2622   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2623           "Preload all classes used by a class before start loading")       \
2624                                                                             \
2625   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2626           "Force a safepoint every n compiles so sweeper can keep up")      \
2627                                                                             \
2628   develop(bool, FillDelaySlots, true,                                       \
2629           "Fill delay slots (on SPARC only)")                               \
2630                                                                             \
2631   develop(bool, TimeLivenessAnalysis, false,                                \
2632           "Time computation of bytecode liveness analysis")                 \
2633                                                                             \
2634   develop(bool, TraceLivenessGen, false,                                    \
2635           "Trace the generation of liveness analysis information")          \
2636                                                                             \
2637   notproduct(bool, TraceLivenessQuery, false,                               \
2638           "Trace queries of liveness analysis information")                 \
2639                                                                             \
2640   notproduct(bool, CollectIndexSetStatistics, false,                        \
2641           "Collect information about IndexSets")                            \
2642                                                                             \
2643   develop(bool, UseLoopSafepoints, true,                                    \
2644           "Generate Safepoint nodes in every loop")                         \
2645                                                                             \
2646   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2647           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2648           "Inline allocations larger than this in doublewords must go slow")\
2649                                                                             \
2650   product(bool, AggressiveOpts, false,                                      \
2651           "Enable aggressive optimizations - see arguments.cpp")            \
2652                                                                             \
2653   /* statistics */                                                          \
2654   develop(bool, CountCompiledCalls, false,                                  \
2655           "counts method invocations")                                      \
2656                                                                             \
2657   notproduct(bool, CountRuntimeCalls, false,                                \
2658           "counts VM runtime calls")                                        \
2659                                                                             \
2660   develop(bool, CountJNICalls, false,                                       \
2661           "counts jni method invocations")                                  \
2662                                                                             \
2663   notproduct(bool, CountJVMCalls, false,                                    \
2664           "counts jvm method invocations")                                  \
2665                                                                             \
2666   notproduct(bool, CountRemovableExceptions, false,                         \
2667           "count exceptions that could be replaced by branches due to "     \
2668           "inlining")                                                       \
2669                                                                             \
2670   notproduct(bool, ICMissHistogram, false,                                  \
2671           "produce histogram of IC misses")                                 \
2672                                                                             \
2673   notproduct(bool, PrintClassStatistics, false,                             \
2674           "prints class statistics at end of run")                          \
2675                                                                             \
2676   notproduct(bool, PrintMethodStatistics, false,                            \
2677           "prints method statistics at end of run")                         \
2678                                                                             \
2679   /* interpreter */                                                         \
2680   develop(bool, ClearInterpreterLocals, false,                              \
2681           "Always clear local variables of interpreter activations upon "   \
2682           "entry")                                                          \
2683                                                                             \
2684   product_pd(bool, RewriteBytecodes,                                        \
2685           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2686                                                                             \
2687   product_pd(bool, RewriteFrequentPairs,                                    \
2688           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2689                                                                             \
2690   diagnostic(bool, PrintInterpreter, false,                                 \
2691           "Prints the generated interpreter code")                          \
2692                                                                             \
2693   product(bool, UseInterpreter, true,                                       \
2694           "Use interpreter for non-compiled methods")                       \
2695                                                                             \
2696   develop(bool, UseFastSignatureHandlers, true,                             \
2697           "Use fast signature handlers for native calls")                   \
2698                                                                             \
2699   product(bool, UseLoopCounter, true,                                       \
2700           "Increment invocation counter on backward branch")                \
2701                                                                             \
2702   product(bool, UseFastEmptyMethods, true,                                  \
2703           "Use fast method entry code for empty methods")                   \
2704                                                                             \
2705   product(bool, UseFastAccessorMethods, true,                               \
2706           "Use fast method entry code for accessor methods")                \
2707                                                                             \
2708   product_pd(bool, UseOnStackReplacement,                                   \
2709            "Use on stack replacement, calls runtime if invoc. counter "     \
2710            "overflows in loop")                                             \
2711                                                                             \
2712   notproduct(bool, TraceOnStackReplacement, false,                          \
2713           "Trace on stack replacement")                                     \
2714                                                                             \
2715   product_pd(bool, PreferInterpreterNativeStubs,                            \
2716           "Use always interpreter stubs for native methods invoked via "    \
2717           "interpreter")                                                    \
2718                                                                             \
2719   develop(bool, CountBytecodes, false,                                      \
2720           "Count number of bytecodes executed")                             \
2721                                                                             \
2722   develop(bool, PrintBytecodeHistogram, false,                              \
2723           "Print histogram of the executed bytecodes")                      \
2724                                                                             \
2725   develop(bool, PrintBytecodePairHistogram, false,                          \
2726           "Print histogram of the executed bytecode pairs")                 \
2727                                                                             \
2728   diagnostic(bool, PrintSignatureHandlers, false,                           \
2729           "Print code generated for native method signature handlers")      \
2730                                                                             \
2731   develop(bool, VerifyOops, false,                                          \
2732           "Do plausibility checks for oops")                                \
2733                                                                             \
2734   develop(bool, CheckUnhandledOops, false,                                  \
2735           "Check for unhandled oops in VM code")                            \
2736                                                                             \
2737   develop(bool, VerifyJNIFields, trueInDebug,                               \
2738           "Verify jfieldIDs for instance fields")                           \
2739                                                                             \
2740   notproduct(bool, VerifyJNIEnvThread, false,                               \
2741           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2742           "from JNI")                                                       \
2743                                                                             \
2744   develop(bool, VerifyFPU, false,                                           \
2745           "Verify FPU state (check for NaN's, etc.)")                       \
2746                                                                             \
2747   develop(bool, VerifyThread, false,                                        \
2748           "Watch the thread register for corruption (SPARC only)")          \
2749                                                                             \
2750   develop(bool, VerifyActivationFrameSize, false,                           \
2751           "Verify that activation frame didn't become smaller than its "    \
2752           "minimal size")                                                   \
2753                                                                             \
2754   develop(bool, TraceFrequencyInlining, false,                              \
2755           "Trace frequency based inlining")                                 \
2756                                                                             \
2757   develop_pd(bool, InlineIntrinsics,                                        \
2758            "Inline intrinsics that can be statically resolved")             \
2759                                                                             \
2760   product_pd(bool, ProfileInterpreter,                                      \
2761            "Profile at the bytecode level during interpretation")           \
2762                                                                             \
2763   develop_pd(bool, ProfileTraps,                                            \
2764           "Profile deoptimization traps at the bytecode level")             \
2765                                                                             \
2766   product(intx, ProfileMaturityPercentage, 20,                              \
2767           "number of method invocations/branches (expressed as % of "       \
2768           "CompileThreshold) before using the method's profile")            \
2769                                                                             \
2770   develop(bool, PrintMethodData, false,                                     \
2771            "Print the results of +ProfileInterpreter at end of run")        \
2772                                                                             \
2773   develop(bool, VerifyDataPointer, trueInDebug,                             \
2774           "Verify the method data pointer during interpreter profiling")    \
2775                                                                             \
2776   develop(bool, VerifyCompiledCode, false,                                  \
2777           "Include miscellaneous runtime verifications in nmethod code; "   \
2778           "default off because it disturbs nmethod size heuristics")        \
2779                                                                             \
2780   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2781           "Manually make GC thread crash then dump java stack trace;  "     \
2782           "Test only")                                                      \
2783                                                                             \
2784   /* compilation */                                                         \
2785   product(bool, UseCompiler, true,                                          \
2786           "use compilation")                                                \
2787                                                                             \
2788   develop(bool, TraceCompilationPolicy, false,                              \
2789           "Trace compilation policy")                                       \
2790                                                                             \
2791   develop(bool, TimeCompilationPolicy, false,                               \
2792           "Time the compilation policy")                                    \
2793                                                                             \
2794   product(bool, UseCounterDecay, true,                                      \
2795            "adjust recompilation counters")                                 \
2796                                                                             \
2797   develop(intx, CounterHalfLifeTime,    30,                                 \
2798           "half-life time of invocation counters (in secs)")                \
2799                                                                             \
2800   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2801           "Min. ms. between invocation of CounterDecay")                    \
2802                                                                             \
2803   product(bool, AlwaysCompileLoopMethods, false,                            \
2804           "when using recompilation, never interpret methods "              \
2805           "containing loops")                                               \
2806                                                                             \
2807   product(bool, DontCompileHugeMethods, true,                               \
2808           "don't compile methods > HugeMethodLimit")                        \
2809                                                                             \
2810   /* Bytecode escape analysis estimation. */                                \
2811   product(bool, EstimateArgEscape, true,                                    \
2812           "Analyze bytecodes to estimate escape state of arguments")        \
2813                                                                             \
2814   product(intx, BCEATraceLevel, 0,                                          \
2815           "How much tracing to do of bytecode escape analysis estimates")   \
2816                                                                             \
2817   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2818           "Maximum number of nested calls that are analyzed by BC EA.")     \
2819                                                                             \
2820   product(intx, MaxBCEAEstimateSize, 150,                                   \
2821           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2822                                                                             \
2823   product(intx,  AllocatePrefetchStyle, 1,                                  \
2824           "0 = no prefetch, "                                               \
2825           "1 = prefetch instructions for each allocation, "                 \
2826           "2 = use TLAB watermark to gate allocation prefetch, "            \
2827           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2828                                                                             \
2829   product(intx,  AllocatePrefetchDistance, -1,                              \
2830           "Distance to prefetch ahead of allocation pointer")               \
2831                                                                             \
2832   product(intx,  AllocatePrefetchLines, 3,                                  \
2833           "Number of lines to prefetch ahead of array allocation pointer")  \
2834                                                                             \
2835   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2836           "Number of lines to prefetch ahead of instance allocation pointer") \
2837                                                                             \
2838   product(intx,  AllocatePrefetchStepSize, 16,                              \
2839           "Step size in bytes of sequential prefetch instructions")         \
2840                                                                             \
2841   product(intx,  AllocatePrefetchInstr, 0,                                  \
2842           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2843                                                                             \
2844   /* deoptimization */                                                      \
2845   develop(bool, TraceDeoptimization, false,                                 \
2846           "Trace deoptimization")                                           \
2847                                                                             \
2848   develop(bool, DebugDeoptimization, false,                                 \
2849           "Tracing various information while debugging deoptimization")     \
2850                                                                             \
2851   product(intx, SelfDestructTimer, 0,                                       \
2852           "Will cause VM to terminate after a given time (in minutes) "     \
2853           "(0 means off)")                                                  \
2854                                                                             \
2855   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2856           "Max. no. of lines in the stack trace for Java exceptions "       \
2857           "(0 means all)")                                                  \
2858                                                                             \
2859   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2860           "Guarantee a safepoint (at least) every so many milliseconds "    \
2861           "(0 means none)"))                                                \
2862                                                                             \
2863   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2864           "Guarantee a safepoint (at least) every so many milliseconds "    \
2865           "(0 means none)"))                                                \
2866                                                                             \
2867   product(intx, SafepointTimeoutDelay, 10000,                               \
2868           "Delay in milliseconds for option SafepointTimeout")              \
2869                                                                             \
2870   product(intx, NmethodSweepFraction, 16,                                   \
2871           "Number of invocations of sweeper to cover all nmethods")         \
2872                                                                             \
2873   product(intx, NmethodSweepCheckInterval, 5,                               \
2874           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2875                                                                             \
2876   product(intx, NmethodSweepActivity, 10,                                   \
2877           "Removes cold nmethods from code cache if > 0. Higher values "    \
2878           "result in more aggressive sweeping")                             \
2879                                                                             \
2880   notproduct(bool, LogSweeper, false,                                       \
2881             "Keep a ring buffer of sweeper activity")                       \
2882                                                                             \
2883   notproduct(intx, SweeperLogEntries, 1024,                                 \
2884             "Number of records in the ring buffer of sweeper activity")     \
2885                                                                             \
2886   notproduct(intx, MemProfilingInterval, 500,                               \
2887           "Time between each invocation of the MemProfiler")                \
2888                                                                             \
2889   develop(intx, MallocCatchPtr, -1,                                         \
2890           "Hit breakpoint when mallocing/freeing this pointer")             \
2891                                                                             \
2892   notproduct(intx, AssertRepeat, 1,                                         \
2893           "number of times to evaluate expression in assert "               \
2894           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2895                                                                             \
2896   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2897           "List of assertions (file:line) to muzzle")                       \
2898                                                                             \
2899   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2900           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2901           "is used")                                                        \
2902                                                                             \
2903   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2904           "Threshold for total handle allocation when "                     \
2905           "+TraceHandleAllocation is used")                                 \
2906                                                                             \
2907   develop(intx, StackPrintLimit, 100,                                       \
2908           "number of stack frames to print in VM-level stack dump")         \
2909                                                                             \
2910   notproduct(intx, MaxElementPrintSize, 256,                                \
2911           "maximum number of elements to print")                            \
2912                                                                             \
2913   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2914           "maximum number of subklasses to print when printing klass")      \
2915                                                                             \
2916   product(intx, MaxInlineLevel, 9,                                          \
2917           "maximum number of nested calls that are inlined")                \
2918                                                                             \
2919   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2920           "maximum number of nested recursive calls that are inlined")      \
2921                                                                             \
2922   product_pd(intx, InlineSmallCode,                                         \
2923           "Only inline already compiled methods if their code size is "     \
2924           "less than this")                                                 \
2925                                                                             \
2926   product(intx, MaxInlineSize, 35,                                          \
2927           "maximum bytecode size of a method to be inlined")                \
2928                                                                             \
2929   product_pd(intx, FreqInlineSize,                                          \
2930           "maximum bytecode size of a frequent method to be inlined")       \
2931                                                                             \
2932   product(intx, MaxTrivialSize, 6,                                          \
2933           "maximum bytecode size of a trivial method to be inlined")        \
2934                                                                             \
2935   product(intx, MinInliningThreshold, 250,                                  \
2936           "min. invocation count a method needs to have to be inlined")     \
2937                                                                             \
2938   develop(intx, MethodHistogramCutoff, 100,                                 \
2939           "cutoff value for method invoc. histogram (+CountCalls)")         \
2940                                                                             \
2941   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2942           "# of interpreted methods to show in profile")                    \
2943                                                                             \
2944   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2945           "# of compiled methods to show in profile")                       \
2946                                                                             \
2947   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2948           "# of stub methods to show in profile")                           \
2949                                                                             \
2950   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2951           "# of runtime stub nodes to show in profile")                     \
2952                                                                             \
2953   product(intx, ProfileIntervalsTicks, 100,                                 \
2954           "# of ticks between printing of interval profile "                \
2955           "(+ProfileIntervals)")                                            \
2956                                                                             \
2957   notproduct(intx, ScavengeALotInterval,     1,                             \
2958           "Interval between which scavenge will occur with +ScavengeALot")  \
2959                                                                             \
2960   notproduct(intx, FullGCALotInterval,     1,                               \
2961           "Interval between which full gc will occur with +FullGCALot")     \
2962                                                                             \
2963   notproduct(intx, FullGCALotStart,     0,                                  \
2964           "For which invocation to start FullGCAlot")                       \
2965                                                                             \
2966   notproduct(intx, FullGCALotDummies,  32*K,                                \
2967           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2968           "to move")                                                        \
2969                                                                             \
2970   develop(intx, DontYieldALotInterval,    10,                               \
2971           "Interval between which yields will be dropped (milliseconds)")   \
2972                                                                             \
2973   develop(intx, MinSleepInterval,     1,                                    \
2974           "Minimum sleep() interval (milliseconds) when "                   \
2975           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2976                                                                             \
2977   develop(intx, ProfilerPCTickThreshold,    15,                             \
2978           "Number of ticks in a PC buckets to be a hotspot")                \
2979                                                                             \
2980   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2981           "Number of exits until DeoptimizeALot kicks in")                  \
2982                                                                             \
2983   notproduct(intx, ZombieALotInterval,     5,                               \
2984           "Number of exits until ZombieALot kicks in")                      \
2985                                                                             \
2986   develop(bool, StressNonEntrant, false,                                    \
2987           "Mark nmethods non-entrant at registration")                      \
2988                                                                             \
2989   diagnostic(intx, MallocVerifyInterval,     0,                             \
2990           "if non-zero, verify C heap after every N calls to "              \
2991           "malloc/realloc/free")                                            \
2992                                                                             \
2993   diagnostic(intx, MallocVerifyStart,     0,                                \
2994           "if non-zero, start verifying C heap after Nth call to "          \
2995           "malloc/realloc/free")                                            \
2996                                                                             \
2997   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2998           "if non-zero, max # of Words that malloc/realloc can allocate "   \
2999           "(for testing only)")                                             \
3000                                                                             \
3001   product(intx, TypeProfileWidth,     2,                                    \
3002           "number of receiver types to record in call/cast profile")        \
3003                                                                             \
3004   develop(intx, BciProfileWidth,      2,                                    \
3005           "number of return bci's to record in ret profile")                \
3006                                                                             \
3007   product(intx, PerMethodRecompilationCutoff, 400,                          \
3008           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
3009                                                                             \
3010   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
3011           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
3012                                                                             \
3013   product(intx, PerMethodTrapLimit,  100,                                   \
3014           "Limit on traps (of one kind) in a method (includes inlines)")    \
3015                                                                             \
3016   product(intx, PerBytecodeTrapLimit,  4,                                   \
3017           "Limit on traps (of one kind) at a particular BCI")               \
3018                                                                             \
3019   develop(intx, InlineFrequencyRatio,    20,                                \
3020           "Ratio of call site execution to caller method invocation")       \
3021                                                                             \
3022   develop_pd(intx, InlineFrequencyCount,                                    \
3023           "Count of call site execution necessary to trigger frequent "     \
3024           "inlining")                                                       \
3025                                                                             \
3026   develop(intx, InlineThrowCount,    50,                                    \
3027           "Force inlining of interpreted methods that throw this often")    \
3028                                                                             \
3029   develop(intx, InlineThrowMaxSize,   200,                                  \
3030           "Force inlining of throwing methods smaller than this")           \
3031                                                                             \
3032   develop(intx, ProfilerNodeSize,  1024,                                    \
3033           "Size in K to allocate for the Profile Nodes of each thread")     \
3034                                                                             \
3035   product_pd(intx, PreInflateSpin,                                          \
3036           "Number of times to spin wait before inflation")                  \
3037                                                                             \
3038   /* gc parameters */                                                       \
3039   product(uintx, InitialHeapSize, 0,                                        \
3040           "Initial heap size (in bytes); zero means use ergonomics")        \
3041                                                                             \
3042   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
3043           "Maximum heap size (in bytes)")                                   \
3044                                                                             \
3045   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
3046           "Initial tenured generation size (in bytes)")                     \
3047                                                                             \
3048   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
3049           "Initial new generation size (in bytes)")                         \
3050                                                                             \
3051   product(uintx, MaxNewSize, max_uintx,                                     \
3052           "Maximum new generation size (in bytes), max_uintx means set "    \
3053           "ergonomically")                                                  \
3054                                                                             \
3055   product(uintx, PretenureSizeThreshold, 0,                                 \
3056           "Maximum size in bytes of objects allocated in DefNew "           \
3057           "generation; zero means no maximum")                              \
3058                                                                             \
3059   product(uintx, TLABSize, 0,                                               \
3060           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3061                                                                             \
3062   product(uintx, MinTLABSize, 2*K,                                          \
3063           "Minimum allowed TLAB size (in bytes)")                           \
3064                                                                             \
3065   product(uintx, TLABAllocationWeight, 35,                                  \
3066           "Allocation averaging weight")                                    \
3067                                                                             \
3068   product(uintx, TLABWasteTargetPercent, 1,                                 \
3069           "Percentage of Eden that can be wasted")                          \
3070                                                                             \
3071   product(uintx, TLABRefillWasteFraction,    64,                            \
3072           "Max TLAB waste at a refill (internal fragmentation)")            \
3073                                                                             \
3074   product(uintx, TLABWasteIncrement,    4,                                  \
3075           "Increment allowed waste at slow allocation")                     \
3076                                                                             \
3077   product(uintx, SurvivorRatio, 8,                                          \
3078           "Ratio of eden/survivor space size")                              \
3079                                                                             \
3080   product(uintx, NewRatio, 2,                                               \
3081           "Ratio of new/old generation sizes")                              \
3082                                                                             \
3083   product_pd(uintx, NewSizeThreadIncrease,                                  \
3084           "Additional size added to desired new generation size per "       \
3085           "non-daemon thread (in bytes)")                                   \
3086                                                                             \
3087   product_pd(uintx, MetaspaceSize,                                          \
3088           "Initial size of Metaspaces (in bytes)")                          \
3089                                                                             \
3090   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3091           "Maximum size of Metaspaces (in bytes)")                          \
3092                                                                             \
3093   product(uintx, CompressedClassSpaceSize, 1*G,                             \
3094           "Maximum size of class area in Metaspace when compressed "        \
3095           "class pointers are used")                                        \
3096                                                                             \
3097   product(uintx, MinHeapFreeRatio,    40,                                   \
3098           "Min percentage of heap free after GC to avoid expansion")        \
3099                                                                             \
3100   product(uintx, MaxHeapFreeRatio,    70,                                   \
3101           "Max percentage of heap free after GC to avoid shrinking")        \
3102                                                                             \
3103   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3104           "Number of milliseconds per MB of free space in the heap")        \
3105                                                                             \
3106   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3107           "Min change in heap space due to GC (in bytes)")                  \
3108                                                                             \
3109   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3110           "Min expansion of Metaspace (in bytes)")                          \
3111                                                                             \
3112   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3113           "Min percentage of Metaspace free after GC to avoid expansion")   \
3114                                                                             \
3115   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3116           "Max percentage of Metaspace free after GC to avoid shrinking")   \
3117                                                                             \
3118   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3119           "Max expansion of Metaspace without full GC (in bytes)")          \
3120                                                                             \
3121   product(uintx, QueuedAllocationWarningCount, 0,                           \
3122           "Number of times an allocation that queues behind a GC "          \
3123           "will retry before printing a warning")                           \
3124                                                                             \
3125   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3126           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3127                                                                             \
3128   diagnostic(intx, VerifyGCLevel,     0,                                    \
3129           "Generation level at which to start +VerifyBefore/AfterGC")       \
3130                                                                             \
3131   product(uintx, MaxTenuringThreshold,    15,                               \
3132           "Maximum value for tenuring threshold")                           \
3133                                                                             \
3134   product(uintx, InitialTenuringThreshold,    7,                            \
3135           "Initial value for tenuring threshold")                           \
3136                                                                             \
3137   product(uintx, TargetSurvivorRatio,    50,                                \
3138           "Desired percentage of survivor space used after scavenge")       \
3139                                                                             \
3140   product(uintx, MarkSweepDeadRatio,     5,                                 \
3141           "Percentage (0-100) of the old gen allowed as dead wood."         \
3142           "Serial mark sweep treats this as both the min and max value."    \
3143           "CMS uses this value only if it falls back to mark sweep."        \
3144           "Par compact uses a variable scale based on the density of the"   \
3145           "generation and treats this as the max value when the heap is"    \
3146           "either completely full or completely empty.  Par compact also"   \
3147           "has a smaller default value; see arguments.cpp.")                \
3148                                                                             \
3149   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3150           "How often should we fully compact the heap (ignoring the dead "  \
3151           "space parameters)")                                              \
3152                                                                             \
3153   product(intx, PrintCMSStatistics, 0,                                      \
3154           "Statistics for CMS")                                             \
3155                                                                             \
3156   product(bool, PrintCMSInitiationStatistics, false,                        \
3157           "Statistics for initiating a CMS collection")                     \
3158                                                                             \
3159   product(intx, PrintFLSStatistics, 0,                                      \
3160           "Statistics for CMS' FreeListSpace")                              \
3161                                                                             \
3162   product(intx, PrintFLSCensus, 0,                                          \
3163           "Census for CMS' FreeListSpace")                                  \
3164                                                                             \
3165   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3166           "Delay in ms between expansion and allocation")                   \
3167                                                                             \
3168   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3169           "Delay in ms in scheduling GC workers")                           \
3170                                                                             \
3171   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3172           "(Unstable) Number of times to iterate in safepoint loop "        \
3173           " before blocking VM threads ")                                   \
3174                                                                             \
3175   product(intx, DeferPollingPageLoopCount,     -1,                          \
3176           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3177           "before changing safepoint polling page to RO ")                  \
3178                                                                             \
3179   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3180                                                                             \
3181   product(bool, PSChunkLargeArrays, true,                                   \
3182           "true: process large arrays in chunks")                           \
3183                                                                             \
3184   product(uintx, GCDrainStackTargetSize, 64,                                \
3185           "how many entries we'll try to leave on the stack during "        \
3186           "parallel GC")                                                    \
3187                                                                             \
3188   /* stack parameters */                                                    \
3189   product_pd(intx, StackYellowPages,                                        \
3190           "Number of yellow zone (recoverable overflows) pages")            \
3191                                                                             \
3192   product_pd(intx, StackRedPages,                                           \
3193           "Number of red zone (unrecoverable overflows) pages")             \
3194                                                                             \
3195   product_pd(intx, StackShadowPages,                                        \
3196           "Number of shadow zone (for overflow checking) pages"             \
3197           " this should exceed the depth of the VM and native call stack")  \
3198                                                                             \
3199   product_pd(intx, ThreadStackSize,                                         \
3200           "Thread Stack Size (in Kbytes)")                                  \
3201                                                                             \
3202   product_pd(intx, VMThreadStackSize,                                       \
3203           "Non-Java Thread Stack Size (in Kbytes)")                         \
3204                                                                             \
3205   product_pd(intx, CompilerThreadStackSize,                                 \
3206           "Compiler Thread Stack Size (in Kbytes)")                         \
3207                                                                             \
3208   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3209           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3210                                                                             \
3211   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3212           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3213           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3214           "disable this feature")                                           \
3215                                                                             \
3216   /* code cache parameters */                                               \
3217   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3218           "Code cache segment size (in bytes) - smallest unit of "          \
3219           "allocation")                                                     \
3220                                                                             \
3221   develop_pd(intx, CodeEntryAlignment,                                      \
3222           "Code entry alignment for generated code (in bytes)")             \
3223                                                                             \
3224   product_pd(intx, OptoLoopAlignment,                                       \
3225           "Align inner loops to zero relative to this modulus")             \
3226                                                                             \
3227   product_pd(uintx, InitialCodeCacheSize,                                   \
3228           "Initial code cache size (in bytes)")                             \
3229                                                                             \
3230   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3231           "Minimum code cache size (in bytes) required to start VM.")       \
3232                                                                             \
3233   product_pd(uintx, ReservedCodeCacheSize,                                  \
3234           "Reserved code cache size (in bytes) - maximum code cache size")  \
3235                                                                             \
3236   product_pd(uintx, NonProfiledCodeHeapSize,                                \
3237           "Size of code heap with non-profiled methods (in bytes)")         \
3238                                                                             \
3239   product_pd(uintx, ProfiledCodeHeapSize,                                   \
3240           "Size of code heap with profiled methods (in bytes)")             \
3241                                                                             \
3242   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3243           "When less than X space left, we stop compiling.")                \
3244                                                                             \
3245   product_pd(uintx, CodeCacheExpansionSize,                                 \
3246           "Code cache expansion size (in bytes)")                           \
3247                                                                             \
3248   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3249           "Minimum number of segments in a code cache block.")              \
3250                                                                             \
3251   notproduct(bool, ExitOnFullCodeCache, false,                              \
3252           "Exit the VM if we fill the code cache.")                         \
3253                                                                             \
3254   product(bool, UseCodeCacheFlushing, true,                                 \
3255           "Attempt to clean the code cache before shutting off compiler")   \
3256                                                                             \
3257   /* interpreter debugging */                                               \
3258   develop(intx, BinarySwitchThreshold, 5,                                   \
3259           "Minimal number of lookupswitch entries for rewriting to binary " \
3260           "switch")                                                         \
3261                                                                             \
3262   develop(intx, StopInterpreterAt, 0,                                       \
3263           "Stops interpreter execution at specified bytecode number")       \
3264                                                                             \
3265   develop(intx, TraceBytecodesAt, 0,                                        \
3266           "Traces bytecodes starting with specified bytecode number")       \
3267                                                                             \
3268   /* compiler interface */                                                  \
3269   develop(intx, CIStart, 0,                                                 \
3270           "the id of the first compilation to permit")                      \
3271                                                                             \
3272   develop(intx, CIStop,    -1,                                              \
3273           "the id of the last compilation to permit")                       \
3274                                                                             \
3275   develop(intx, CIStartOSR,     0,                                          \
3276           "the id of the first osr compilation to permit "                  \
3277           "(CICountOSR must be on)")                                        \
3278                                                                             \
3279   develop(intx, CIStopOSR,    -1,                                           \
3280           "the id of the last osr compilation to permit "                   \
3281           "(CICountOSR must be on)")                                        \
3282                                                                             \
3283   develop(intx, CIBreakAtOSR,    -1,                                        \
3284           "id of osr compilation to break at")                              \
3285                                                                             \
3286   develop(intx, CIBreakAt,    -1,                                           \
3287           "id of compilation to break at")                                  \
3288                                                                             \
3289   product(ccstrlist, CompileOnly, "",                                       \
3290           "List of methods (pkg/class.name) to restrict compilation to")    \
3291                                                                             \
3292   product(ccstr, CompileCommandFile, NULL,                                  \
3293           "Read compiler commands from this file [.hotspot_compiler]")      \
3294                                                                             \
3295   product(ccstrlist, CompileCommand, "",                                    \
3296           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3297                                                                             \
3298   develop(bool, ReplayCompiles, false,                                      \
3299           "Enable replay of compilations from ReplayDataFile")              \
3300                                                                             \
3301   product(ccstr, ReplayDataFile, NULL,                                      \
3302           "File containing compilation replay information"                  \
3303           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3304                                                                             \
3305   develop(intx, ReplaySuppressInitializers, 2,                              \
3306           "Controls handling of class initialization during replay"         \
3307           "0 - don't do anything special"                                   \
3308           "1 - treat all class initializers as empty"                       \
3309           "2 - treat class initializers for application classes as empty"   \
3310           "3 - allow all class initializers to run during bootstrap but"    \
3311           "    pretend they are empty after starting replay")               \
3312                                                                             \
3313   develop(bool, ReplayIgnoreInitErrors, false,                              \
3314           "Ignore exceptions thrown during initialization for replay")      \
3315                                                                             \
3316   product(bool, DumpReplayDataOnError, true,                                \
3317           "Record replay data for crashing compiler threads")               \
3318                                                                             \
3319   product(bool, CICompilerCountPerCPU, false,                               \
3320           "1 compiler thread for log(N CPUs)")                              \
3321                                                                             \
3322   develop(intx, CIFireOOMAt,    -1,                                         \
3323           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3324           "(non-negative value throws OOM after this many CI accesses "     \
3325           "in each compile)")                                               \
3326   notproduct(intx, CICrashAt, -1,                                           \
3327           "id of compilation to trigger assert in compiler thread for "     \
3328           "the purpose of testing, e.g. generation of replay data")         \
3329   notproduct(bool, CIObjectFactoryVerify, false,                            \
3330           "enable potentially expensive verification in ciObjectFactory")   \
3331                                                                             \
3332   /* Priorities */                                                          \
3333   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3334                                                                             \
3335   product(intx, ThreadPriorityPolicy, 0,                                    \
3336           "0 : Normal.                                                     "\
3337           "    VM chooses priorities that are appropriate for normal       "\
3338           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3339           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3340           "    map to lower native priority values. On Windows applications"\
3341           "    are allowed to use higher native priorities. However, with  "\
3342           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3343           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3344           "    interfere with system threads. On Linux thread priorities   "\
3345           "    are ignored because the OS does not support static priority "\
3346           "    in SCHED_OTHER scheduling class which is the only choice for"\
3347           "    non-root, non-realtime applications.                        "\
3348           "1 : Aggressive.                                                 "\
3349           "    Java thread priorities map over to the entire range of      "\
3350           "    native thread priorities. Higher Java thread priorities map "\
3351           "    to higher native thread priorities. This policy should be   "\
3352           "    used with care, as sometimes it can cause performance       "\
3353           "    degradation in the application and/or the entire system. On "\
3354           "    Linux this policy requires root privilege.")                 \
3355                                                                             \
3356   product(bool, ThreadPriorityVerbose, false,                               \
3357           "Print priority changes")                                         \
3358                                                                             \
3359   product(intx, DefaultThreadPriority, -1,                                  \
3360           "The native priority at which threads run if not elsewhere "      \
3361           "specified (-1 means no change)")                                 \
3362                                                                             \
3363   product(intx, CompilerThreadPriority, -1,                                 \
3364           "The native priority at which compiler threads should run "       \
3365           "(-1 means no change)")                                           \
3366                                                                             \
3367   product(intx, VMThreadPriority, -1,                                       \
3368           "The native priority at which the VM thread should run "          \
3369           "(-1 means no change)")                                           \
3370                                                                             \
3371   product(bool, CompilerThreadHintNoPreempt, true,                          \
3372           "(Solaris only) Give compiler threads an extra quanta")           \
3373                                                                             \
3374   product(bool, VMThreadHintNoPreempt, false,                               \
3375           "(Solaris only) Give VM thread an extra quanta")                  \
3376                                                                             \
3377   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3378   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3379   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3380   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3381   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3382   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3383   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3384   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3385   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3386   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3387                                                                             \
3388   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3389           "Java thread priority 10 maps to critical scheduling priority")   \
3390                                                                             \
3391   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3392           "Compiler thread(s) run at critical scheduling priority")         \
3393                                                                             \
3394   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3395           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3396                                                                             \
3397   /* compiler debugging */                                                  \
3398   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3399           "First class to consider when using +CompileTheWorld")            \
3400                                                                             \
3401   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3402           "Last class to consider when using +CompileTheWorld")             \
3403                                                                             \
3404   develop(intx, NewCodeParameter,      0,                                   \
3405           "Testing Only: Create a dedicated integer parameter before "      \
3406           "putback")                                                        \
3407                                                                             \
3408   /* new oopmap storage allocation */                                       \
3409   develop(intx, MinOopMapAllocation,     8,                                 \
3410           "Minimum number of OopMap entries in an OopMapSet")               \
3411                                                                             \
3412   /* Background Compilation */                                              \
3413   develop(intx, LongCompileThreshold,     50,                               \
3414           "Used with +TraceLongCompiles")                                   \
3415                                                                             \
3416   product(intx, StarvationMonitorInterval,    200,                          \
3417           "Pause between each check in ms")                                 \
3418                                                                             \
3419   /* recompilation */                                                       \
3420   product_pd(intx, CompileThreshold,                                        \
3421           "number of interpreted method invocations before (re-)compiling") \
3422                                                                             \
3423   product_pd(intx, BackEdgeThreshold,                                       \
3424           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3425                                                                             \
3426   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3427           "Interpreter (tier 0) invocation notification frequency.")        \
3428                                                                             \
3429   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3430           "C1 without MDO (tier 2) invocation notification frequency.")     \
3431                                                                             \
3432   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3433           "C1 with MDO profiling (tier 3) invocation notification "         \
3434           "frequency.")                                                     \
3435                                                                             \
3436   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3437           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3438                                                                             \
3439   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3440           "Interpreter (tier 0) invocation notification frequency.")        \
3441                                                                             \
3442   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3443           "C1 without MDO (tier 2) invocation notification frequency.")     \
3444                                                                             \
3445   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3446           "C1 with MDO profiling (tier 3) invocation notification "         \
3447           "frequency.")                                                     \
3448                                                                             \
3449   product(intx, Tier2CompileThreshold, 0,                                   \
3450           "threshold at which tier 2 compilation is invoked")               \
3451                                                                             \
3452   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3453           "Back edge threshold at which tier 2 compilation is invoked")     \
3454                                                                             \
3455   product(intx, Tier3InvocationThreshold, 200,                              \
3456           "Compile if number of method invocations crosses this "           \
3457           "threshold")                                                      \
3458                                                                             \
3459   product(intx, Tier3MinInvocationThreshold, 100,                           \
3460           "Minimum invocation to compile at tier 3")                        \
3461                                                                             \
3462   product(intx, Tier3CompileThreshold, 2000,                                \
3463           "Threshold at which tier 3 compilation is invoked (invocation "   \
3464           "minimum must be satisfied.")                                     \
3465                                                                             \
3466   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3467           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3468                                                                             \
3469   product(intx, Tier4InvocationThreshold, 5000,                             \
3470           "Compile if number of method invocations crosses this "           \
3471           "threshold")                                                      \
3472                                                                             \
3473   product(intx, Tier4MinInvocationThreshold, 600,                           \
3474           "Minimum invocation to compile at tier 4")                        \
3475                                                                             \
3476   product(intx, Tier4CompileThreshold, 15000,                               \
3477           "Threshold at which tier 4 compilation is invoked (invocation "   \
3478           "minimum must be satisfied.")                                     \
3479                                                                             \
3480   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3481           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3482                                                                             \
3483   product(intx, Tier3DelayOn, 5,                                            \
3484           "If C2 queue size grows over this amount per compiler thread "    \
3485           "stop compiling at tier 3 and start compiling at tier 2")         \
3486                                                                             \
3487   product(intx, Tier3DelayOff, 2,                                           \
3488           "If C2 queue size is less than this amount per compiler thread "  \
3489           "allow methods compiled at tier 2 transition to tier 3")          \
3490                                                                             \
3491   product(intx, Tier3LoadFeedback, 5,                                       \
3492           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3493           "reaches this amount per compiler thread")                        \
3494                                                                             \
3495   product(intx, Tier4LoadFeedback, 3,                                       \
3496           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3497           "reaches this amount per compiler thread")                        \
3498                                                                             \
3499   product(intx, TieredCompileTaskTimeout, 50,                               \
3500           "Kill compile task if method was not used within "                \
3501           "given timeout in milliseconds")                                  \
3502                                                                             \
3503   product(intx, TieredStopAtLevel, 4,                                       \
3504           "Stop at given compilation level")                                \
3505                                                                             \
3506   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3507           "Start profiling in interpreter if the counters exceed tier 3"    \
3508           "thresholds by the specified percentage")                         \
3509                                                                             \
3510   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3511           "Increase the compile threshold for C1 compilation if the code"   \
3512           "cache is filled by the specified percentage.")                   \
3513                                                                             \
3514   product(intx, TieredRateUpdateMinTime, 1,                                 \
3515           "Minimum rate sampling interval (in milliseconds)")               \
3516                                                                             \
3517   product(intx, TieredRateUpdateMaxTime, 25,                                \
3518           "Maximum rate sampling interval (in milliseconds)")               \
3519                                                                             \
3520   product_pd(bool, TieredCompilation,                                       \
3521           "Enable tiered compilation")                                      \
3522                                                                             \
3523   product(bool, PrintTieredEvents, false,                                   \
3524           "Print tiered events notifications")                              \
3525                                                                             \
3526   product_pd(intx, OnStackReplacePercentage,                                \
3527           "NON_TIERED number of method invocations/branches (expressed as %"\
3528           "of CompileThreshold) before (re-)compiling OSR code")            \
3529                                                                             \
3530   product(intx, InterpreterProfilePercentage, 33,                           \
3531           "NON_TIERED number of method invocations/branches (expressed as %"\
3532           "of CompileThreshold) before profiling in the interpreter")       \
3533                                                                             \
3534   develop(intx, MaxRecompilationSearchLength,    10,                        \
3535           "max. # frames to inspect searching for recompilee")              \
3536                                                                             \
3537   develop(intx, MaxInterpretedSearchLength,     3,                          \
3538           "max. # interp. frames to skip when searching for recompilee")    \
3539                                                                             \
3540   develop(intx, DesiredMethodLimit,  8000,                                  \
3541           "desired max. method size (in bytecodes) after inlining")         \
3542                                                                             \
3543   develop(intx, HugeMethodLimit,  8000,                                     \
3544           "don't compile methods larger than this if "                      \
3545           "+DontCompileHugeMethods")                                        \
3546                                                                             \
3547   /* New JDK 1.4 reflection implementation */                               \
3548                                                                             \
3549   develop(bool, UseNewReflection, true,                                     \
3550           "Temporary flag for transition to reflection based on dynamic "   \
3551           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3552           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3553           "changes were needed")                                            \
3554                                                                             \
3555   develop(bool, VerifyReflectionBytecodes, false,                           \
3556           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3557           "in situations like that described in 4486457 or for "            \
3558           "constructors generated for serialization, so can not be enabled "\
3559           "in product.")                                                    \
3560                                                                             \
3561   product(bool, ReflectionWrapResolutionErrors, true,                       \
3562           "Temporary flag for transition to AbstractMethodError wrapped "   \
3563           "in InvocationTargetException. See 6531596")                      \
3564                                                                             \
3565   develop(bool, VerifyLambdaBytecodes, false,                               \
3566           "Force verification of jdk 8 lambda metafactory bytecodes.")      \
3567                                                                             \
3568   develop(intx, FastSuperclassLimit, 8,                                     \
3569           "Depth of hardwired instanceof accelerator array")                \
3570                                                                             \
3571   /* Properties for Java libraries  */                                      \
3572                                                                             \
3573   product(uintx, MaxDirectMemorySize, 0,                                    \
3574           "Maximum total size of NIO direct-buffer allocations")            \
3575                                                                             \
3576   /* temporary developer defined flags  */                                  \
3577                                                                             \
3578   diagnostic(bool, UseNewCode, false,                                       \
3579           "Testing Only: Use the new version while testing")                \
3580                                                                             \
3581   diagnostic(bool, UseNewCode2, false,                                      \
3582           "Testing Only: Use the new version while testing")                \
3583                                                                             \
3584   diagnostic(bool, UseNewCode3, false,                                      \
3585           "Testing Only: Use the new version while testing")                \
3586                                                                             \
3587   /* flags for performance data collection */                               \
3588                                                                             \
3589   product(bool, UsePerfData, falseInEmbedded,                               \
3590           "Flag to disable jvmstat instrumentation for performance testing" \
3591           "and problem isolation purposes.")                                \
3592                                                                             \
3593   product(bool, PerfDataSaveToFile, false,                                  \
3594           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3595                                                                             \
3596   product(ccstr, PerfDataSaveFile, NULL,                                    \
3597           "Save PerfData memory to the specified absolute pathname,"        \
3598            "%p in the file name if present will be replaced by pid")        \
3599                                                                             \
3600   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3601           "Data sampling interval in milliseconds")                         \
3602                                                                             \
3603   develop(bool, PerfTraceDataCreation, false,                               \
3604           "Trace creation of Performance Data Entries")                     \
3605                                                                             \
3606   develop(bool, PerfTraceMemOps, false,                                     \
3607           "Trace PerfMemory create/attach/detach calls")                    \
3608                                                                             \
3609   product(bool, PerfDisableSharedMem, false,                                \
3610           "Store performance data in standard memory")                      \
3611                                                                             \
3612   product(intx, PerfDataMemorySize, 32*K,                                   \
3613           "Size of performance data memory region. Will be rounded "        \
3614           "up to a multiple of the native os page size.")                   \
3615                                                                             \
3616   product(intx, PerfMaxStringConstLength, 1024,                             \
3617           "Maximum PerfStringConstant string length before truncation")     \
3618                                                                             \
3619   product(bool, PerfAllowAtExitRegistration, false,                         \
3620           "Allow registration of atexit() methods")                         \
3621                                                                             \
3622   product(bool, PerfBypassFileSystemCheck, false,                           \
3623           "Bypass Win32 file system criteria checks (Windows Only)")        \
3624                                                                             \
3625   product(intx, UnguardOnExecutionViolation, 0,                             \
3626           "Unguard page and retry on no-execute fault (Win32 only)"         \
3627           "0=off, 1=conservative, 2=aggressive")                            \
3628                                                                             \
3629   /* Serviceability Support */                                              \
3630                                                                             \
3631   product(bool, ManagementServer, false,                                    \
3632           "Create JMX Management Server")                                   \
3633                                                                             \
3634   product(bool, DisableAttachMechanism, false,                              \
3635          "Disable mechanism that allows tools to attach to this VM")        \
3636                                                                             \
3637   product(bool, StartAttachListener, false,                                 \
3638           "Always start Attach Listener at VM startup")                     \
3639                                                                             \
3640   manageable(bool, PrintConcurrentLocks, false,                             \
3641           "Print java.util.concurrent locks in thread dump")                \
3642                                                                             \
3643   product(bool, TransmitErrorReport, false,                                 \
3644           "Enable error report transmission on erroneous termination")      \
3645                                                                             \
3646   product(ccstr, ErrorReportServer, NULL,                                   \
3647           "Override built-in error report server address")                  \
3648                                                                             \
3649   /* Shared spaces */                                                       \
3650                                                                             \
3651   product(bool, UseSharedSpaces, true,                                      \
3652           "Use shared spaces for metadata")                                 \
3653                                                                             \
3654   product(bool, RequireSharedSpaces, false,                                 \
3655           "Require shared spaces for metadata")                             \
3656                                                                             \
3657   product(bool, DumpSharedSpaces, false,                                    \
3658            "Special mode: JVM reads a class list, loads classes, builds "   \
3659             "shared spaces, and dumps the shared spaces to a file to be "   \
3660             "used in future JVM runs.")                                     \
3661                                                                             \
3662   product(bool, PrintSharedSpaces, false,                                   \
3663           "Print usage of shared spaces")                                   \
3664                                                                             \
3665   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3666           "Size of read-write space for metadata (in bytes)")               \
3667                                                                             \
3668   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3669           "Size of read-only space for metadata (in bytes)")                \
3670                                                                             \
3671   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3672           "Size of the shared miscellaneous data area (in bytes)")          \
3673                                                                             \
3674   product(uintx, SharedMiscCodeSize,    120*K,                              \
3675           "Size of the shared miscellaneous code area (in bytes)")          \
3676                                                                             \
3677   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3678           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3679           "Address to allocate shared memory region for class data")        \
3680                                                                             \
3681   diagnostic(bool, EnableInvokeDynamic, true,                               \
3682           "support JSR 292 (method handles, invokedynamic, "                \
3683           "anonymous classes")                                              \
3684                                                                             \
3685   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3686           "Print generated stub code for method handles")                   \
3687                                                                             \
3688   develop(bool, TraceMethodHandles, false,                                  \
3689           "trace internal method handle operations")                        \
3690                                                                             \
3691   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3692           "perform extra checks when constructing method handles")          \
3693                                                                             \
3694   diagnostic(bool, ShowHiddenFrames, false,                                 \
3695           "show method handle implementation frames (usually hidden)")      \
3696                                                                             \
3697   experimental(bool, TrustFinalNonStaticFields, false,                      \
3698           "trust final non-static declarations for constant folding")       \
3699                                                                             \
3700   experimental(bool, FoldStableValues, false,                               \
3701           "Private flag to control optimizations for stable variables")     \
3702                                                                             \
3703   develop(bool, TraceInvokeDynamic, false,                                  \
3704           "trace internal invoke dynamic operations")                       \
3705                                                                             \
3706   diagnostic(bool, PauseAtStartup,      false,                              \
3707           "Causes the VM to pause at startup time and wait for the pause "  \
3708           "file to be removed (default: ./vm.paused.<pid>)")                \
3709                                                                             \
3710   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3711           "The file to create and for whose removal to await when pausing " \
3712           "at startup. (default: ./vm.paused.<pid>)")                       \
3713                                                                             \
3714   diagnostic(bool, PauseAtExit, false,                                      \
3715           "Pause and wait for keypress on exit if a debugger is attached")  \
3716                                                                             \
3717   product(bool, ExtendedDTraceProbes,    false,                             \
3718           "Enable performance-impacting dtrace probes")                     \
3719                                                                             \
3720   product(bool, DTraceMethodProbes, false,                                  \
3721           "Enable dtrace probes for method-entry and method-exit")          \
3722                                                                             \
3723   product(bool, DTraceAllocProbes, false,                                   \
3724           "Enable dtrace probes for object allocation")                     \
3725                                                                             \
3726   product(bool, DTraceMonitorProbes, false,                                 \
3727           "Enable dtrace probes for monitor events")                        \
3728                                                                             \
3729   product(bool, RelaxAccessControlCheck, false,                             \
3730           "Relax the access control checks in the verifier")                \
3731                                                                             \
3732   diagnostic(bool, PrintDTraceDOF, false,                                   \
3733              "Print the DTrace DOF passed to the system for JSDT probes")   \
3734                                                                             \
3735   product(uintx, StringTableSize, defaultStringTableSize,                   \
3736           "Number of buckets in the interned String table")                 \
3737                                                                             \
3738   develop(bool, TraceDefaultMethods, false,                                 \
3739           "Trace the default method processing steps")                      \
3740                                                                             \
3741   develop(bool, VerifyGenericSignatures, false,                             \
3742           "Abort VM on erroneous or inconsistent generic signatures")       \
3743                                                                             \
3744   product(bool, UseVMInterruptibleIO, false,                                \
3745           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3746           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3747           " of this flag is true for JDK 6 and earlier")                    \
3748                                                                             \
3749   diagnostic(bool, WhiteBoxAPI, false,                                      \
3750           "Enable internal testing APIs")                                   \
3751                                                                             \
3752   product(bool, PrintGCCause, true,                                         \
3753           "Include GC cause in GC logging")                                 \
3754                                                                             \
3755   product(bool , AllowNonVirtualCalls, false,                               \
3756           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3757                                                                             \
3758   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3759           "Override the default location of the CDS archive file")          \
3760                                                                             \
3761   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3762           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3763           "Allocation less than this value will be allocated "              \
3764           "using malloc. Larger allocations will use mmap.")                \
3765                                                                             \
3766   product(bool, EnableTracing, false,                                       \
3767           "Enable event-based tracing")                                     \
3768   product(bool, UseLockedTracing, false,                                    \
3769           "Use locked-tracing when doing event-based tracing")
3770 
3771 
3772 /*
3773  *  Macros for factoring of globals
3774  */
3775 
3776 // Interface macros
3777 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)      extern "C" type name;
3778 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)          extern "C" type name;
3779 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc)   extern "C" type name;
3780 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3781 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc)   extern "C" type name;
3782 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc)   extern "C" type name;
3783 #ifdef PRODUCT
3784 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type CONST_##name; const type name = value;
3785 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type CONST_##name; const type name = pd_##name;
3786 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type CONST_##name;
3787 #else
3788 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)    extern "C" type name;
3789 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)        extern "C" type name;
3790 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)   extern "C" type name;
3791 #endif
3792 // Special LP64 flags, product only needed for now.
3793 #ifdef _LP64
3794 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3795 #else
3796 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3797 #endif // _LP64
3798 
3799 // Implementation macros
3800 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)      type name = value;
3801 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)          type name = pd_##name;
3802 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc)   type name = value;
3803 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3804 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc)   type name = value;
3805 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc)   type name = value;
3806 #ifdef PRODUCT
3807 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type CONST_##name = value;
3808 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type CONST_##name = pd_##name;
3809 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type CONST_##name = value;
3810 #else
3811 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc)    type name = value;
3812 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)        type name = pd_##name;
3813 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)   type name = value;
3814 #endif
3815 #ifdef _LP64
3816 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value;
3817 #else
3818 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3819 #endif // _LP64
3820 
3821 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)
3822 
3823 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3824 
3825 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3826 
3827 // Extensions
3828 
3829 #include "runtime/globals_ext.hpp"
3830 
3831 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---