1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_sparc
  44 # include "globals_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "globals_zero.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_arm
  50 # include "globals_arm.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_ppc
  53 # include "globals_ppc.hpp"
  54 #endif
  55 #ifdef TARGET_OS_FAMILY_linux
  56 # include "globals_linux.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_solaris
  59 # include "globals_solaris.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_windows
  62 # include "globals_windows.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_bsd
  65 # include "globals_bsd.hpp"
  66 #endif
  67 #ifdef TARGET_OS_ARCH_linux_x86
  68 # include "globals_linux_x86.hpp"
  69 #endif
  70 #ifdef TARGET_OS_ARCH_linux_sparc
  71 # include "globals_linux_sparc.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_zero
  74 # include "globals_linux_zero.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_solaris_x86
  77 # include "globals_solaris_x86.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_solaris_sparc
  80 # include "globals_solaris_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_windows_x86
  83 # include "globals_windows_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_linux_arm
  86 # include "globals_linux_arm.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_linux_ppc
  89 # include "globals_linux_ppc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_bsd_x86
  92 # include "globals_bsd_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_bsd_zero
  95 # include "globals_bsd_zero.hpp"
  96 #endif
  97 #ifdef COMPILER1
  98 #ifdef TARGET_ARCH_x86
  99 # include "c1_globals_x86.hpp"
 100 #endif
 101 #ifdef TARGET_ARCH_sparc
 102 # include "c1_globals_sparc.hpp"
 103 #endif
 104 #ifdef TARGET_ARCH_arm
 105 # include "c1_globals_arm.hpp"
 106 #endif
 107 #ifdef TARGET_ARCH_ppc
 108 # include "c1_globals_ppc.hpp"
 109 #endif
 110 #ifdef TARGET_OS_FAMILY_linux
 111 # include "c1_globals_linux.hpp"
 112 #endif
 113 #ifdef TARGET_OS_FAMILY_solaris
 114 # include "c1_globals_solaris.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_windows
 117 # include "c1_globals_windows.hpp"
 118 #endif
 119 #ifdef TARGET_OS_FAMILY_bsd
 120 # include "c1_globals_bsd.hpp"
 121 #endif
 122 #endif
 123 #ifdef COMPILER2
 124 #ifdef TARGET_ARCH_x86
 125 # include "c2_globals_x86.hpp"
 126 #endif
 127 #ifdef TARGET_ARCH_sparc
 128 # include "c2_globals_sparc.hpp"
 129 #endif
 130 #ifdef TARGET_ARCH_arm
 131 # include "c2_globals_arm.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_linux
 134 # include "c2_globals_linux.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_solaris
 137 # include "c2_globals_solaris.hpp"
 138 #endif
 139 #ifdef TARGET_OS_FAMILY_windows
 140 # include "c2_globals_windows.hpp"
 141 #endif
 142 #ifdef TARGET_OS_FAMILY_bsd
 143 # include "c2_globals_bsd.hpp"
 144 #endif
 145 #endif
 146 #ifdef SHARK
 147 #ifdef TARGET_ARCH_zero
 148 # include "shark_globals_zero.hpp"
 149 #endif
 150 #endif
 151 
 152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 153 define_pd_global(bool, BackgroundCompilation,        false);
 154 define_pd_global(bool, UseTLAB,                      false);
 155 define_pd_global(bool, CICompileOSR,                 false);
 156 define_pd_global(bool, UseTypeProfile,               false);
 157 define_pd_global(bool, UseOnStackReplacement,        false);
 158 define_pd_global(bool, InlineIntrinsics,             false);
 159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 160 define_pd_global(bool, ProfileInterpreter,           false);
 161 define_pd_global(bool, ProfileTraps,                 false);
 162 define_pd_global(bool, TieredCompilation,            false);
 163 
 164 define_pd_global(intx, CompileThreshold,             0);
 165 define_pd_global(intx, BackEdgeThreshold,            0);
 166 
 167 define_pd_global(intx, OnStackReplacePercentage,     0);
 168 define_pd_global(bool, ResizeTLAB,                   false);
 169 define_pd_global(intx, FreqInlineSize,               0);
 170 define_pd_global(intx, InlineSmallCode,              0);
 171 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 172 define_pd_global(intx, InlineClassNatives,           true);
 173 define_pd_global(intx, InlineUnsafeOps,              true);
 174 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 175 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 176 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 177 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 178 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 179 define_pd_global(bool, NeverActAsServerClassMachine, true);
 180 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 181 #define CI_COMPILER_COUNT 0
 182 #else
 183 
 184 #ifdef COMPILER2
 185 #define CI_COMPILER_COUNT 2
 186 #else
 187 #define CI_COMPILER_COUNT 1
 188 #endif // COMPILER2
 189 
 190 #endif // no compilers
 191 
 192 // string type aliases used only in this file
 193 typedef const char* ccstr;
 194 typedef const char* ccstrlist;   // represents string arguments which accumulate
 195 
 196 enum FlagValueOrigin {
 197   DEFAULT          = 0,
 198   COMMAND_LINE     = 1,
 199   ENVIRON_VAR      = 2,
 200   CONFIG_FILE      = 3,
 201   MANAGEMENT       = 4,
 202   ERGONOMIC        = 5,
 203   ATTACH_ON_DEMAND = 6,
 204   INTERNAL         = 99
 205 };
 206 
 207 struct Flag {
 208   const char *type;
 209   const char *name;
 210   void*       addr;
 211 
 212   NOT_PRODUCT(const char *doc;)
 213 
 214   const char *kind;
 215   FlagValueOrigin origin;
 216 
 217   // points to all Flags static array
 218   static Flag *flags;
 219 
 220   // number of flags
 221   static size_t numFlags;
 222 
 223   static Flag* find_flag(char* name, size_t length, bool allow_locked = false);
 224 
 225   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 226   bool get_bool() const       { return *((bool*) addr); }
 227   void set_bool(bool value)   { *((bool*) addr) = value; }
 228 
 229   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 230   intx get_intx() const       { return *((intx*) addr); }
 231   void set_intx(intx value)   { *((intx*) addr) = value; }
 232 
 233   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 234   uintx get_uintx() const     { return *((uintx*) addr); }
 235   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 236 
 237   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 238   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 239   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 240 
 241   bool is_double() const        { return strcmp(type, "double") == 0; }
 242   double get_double() const     { return *((double*) addr); }
 243   void set_double(double value) { *((double*) addr) = value; }
 244 
 245   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 246   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 247   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 248   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 249 
 250   bool is_unlocker() const;
 251   bool is_unlocked() const;
 252   bool is_writeable() const;
 253   bool is_external() const;
 254 
 255   bool is_unlocker_ext() const;
 256   bool is_unlocked_ext() const;
 257   bool is_writeable_ext() const;
 258   bool is_external_ext() const;
 259 
 260   void get_locked_message(char*, int) const;
 261   void get_locked_message_ext(char*, int) const;
 262 
 263   void print_on(outputStream* st, bool withComments = false );
 264   void print_as_flag(outputStream* st);
 265 };
 266 
 267 // debug flags control various aspects of the VM and are global accessible
 268 
 269 // use FlagSetting to temporarily change some debug flag
 270 // e.g. FlagSetting fs(DebugThisAndThat, true);
 271 // restored to previous value upon leaving scope
 272 class FlagSetting {
 273   bool val;
 274   bool* flag;
 275  public:
 276   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 277   ~FlagSetting()                       { *flag = val; }
 278 };
 279 
 280 
 281 class CounterSetting {
 282   intx* counter;
 283  public:
 284   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 285   ~CounterSetting()         { (*counter)--; }
 286 };
 287 
 288 
 289 class IntFlagSetting {
 290   intx val;
 291   intx* flag;
 292  public:
 293   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 294   ~IntFlagSetting()                       { *flag = val; }
 295 };
 296 
 297 
 298 class DoubleFlagSetting {
 299   double val;
 300   double* flag;
 301  public:
 302   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 303   ~DoubleFlagSetting()                           { *flag = val; }
 304 };
 305 
 306 
 307 class CommandLineFlags {
 308  public:
 309   static bool boolAt(char* name, size_t len, bool* value);
 310   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 311   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 312   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 313 
 314   static bool intxAt(char* name, size_t len, intx* value);
 315   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 316   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 317   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 318 
 319   static bool uintxAt(char* name, size_t len, uintx* value);
 320   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 321   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 322   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 323 
 324   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 325   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 326   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 327   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 328 
 329   static bool doubleAt(char* name, size_t len, double* value);
 330   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 331   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 332   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 333 
 334   static bool ccstrAt(char* name, size_t len, ccstr* value);
 335   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 336   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 337   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 338 
 339   // Returns false if name is not a command line flag.
 340   static bool wasSetOnCmdline(const char* name, bool* value);
 341   static void printSetFlags(outputStream* out);
 342 
 343   static void printFlags(outputStream* out, bool withComments);
 344 
 345   static void verify() PRODUCT_RETURN;
 346 };
 347 
 348 // use this for flags that are true by default in the debug version but
 349 // false in the optimized version, and vice versa
 350 #ifdef ASSERT
 351 #define trueInDebug  true
 352 #define falseInDebug false
 353 #else
 354 #define trueInDebug  false
 355 #define falseInDebug true
 356 #endif
 357 
 358 // use this for flags that are true per default in the product build
 359 // but false in development builds, and vice versa
 360 #ifdef PRODUCT
 361 #define trueInProduct  true
 362 #define falseInProduct false
 363 #else
 364 #define trueInProduct  false
 365 #define falseInProduct true
 366 #endif
 367 
 368 #ifdef JAVASE_EMBEDDED
 369 #define falseInEmbedded false
 370 #else
 371 #define falseInEmbedded true
 372 #endif
 373 
 374 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 375 // product flags are always settable / visible
 376 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 377 
 378 // A flag must be declared with one of the following types:
 379 // bool, intx, uintx, ccstr.
 380 // The type "ccstr" is an alias for "const char*" and is used
 381 // only in this file, because the macrology requires single-token type names.
 382 
 383 // Note: Diagnostic options not meant for VM tuning or for product modes.
 384 // They are to be used for VM quality assurance or field diagnosis
 385 // of VM bugs.  They are hidden so that users will not be encouraged to
 386 // try them as if they were VM ordinary execution options.  However, they
 387 // are available in the product version of the VM.  Under instruction
 388 // from support engineers, VM customers can turn them on to collect
 389 // diagnostic information about VM problems.  To use a VM diagnostic
 390 // option, you must first specify +UnlockDiagnosticVMOptions.
 391 // (This master switch also affects the behavior of -Xprintflags.)
 392 //
 393 // experimental flags are in support of features that are not
 394 //    part of the officially supported product, but are available
 395 //    for experimenting with. They could, for example, be performance
 396 //    features that may not have undergone full or rigorous QA, but which may
 397 //    help performance in some cases and released for experimentation
 398 //    by the community of users and developers. This flag also allows one to
 399 //    be able to build a fully supported product that nonetheless also
 400 //    ships with some unsupported, lightly tested, experimental features.
 401 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 402 //    UnlockExperimentalVMOptions flag, which allows the control and
 403 //    modification of the experimental flags.
 404 //
 405 // Nota bene: neither diagnostic nor experimental options should be used casually,
 406 //    and they are not supported on production loads, except under explicit
 407 //    direction from support engineers.
 408 //
 409 // manageable flags are writeable external product flags.
 410 //    They are dynamically writeable through the JDK management interface
 411 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 412 //    These flags are external exported interface (see CCC).  The list of
 413 //    manageable flags can be queried programmatically through the management
 414 //    interface.
 415 //
 416 //    A flag can be made as "manageable" only if
 417 //    - the flag is defined in a CCC as an external exported interface.
 418 //    - the VM implementation supports dynamic setting of the flag.
 419 //      This implies that the VM must *always* query the flag variable
 420 //      and not reuse state related to the flag state at any given time.
 421 //    - you want the flag to be queried programmatically by the customers.
 422 //
 423 // product_rw flags are writeable internal product flags.
 424 //    They are like "manageable" flags but for internal/private use.
 425 //    The list of product_rw flags are internal/private flags which
 426 //    may be changed/removed in a future release.  It can be set
 427 //    through the management interface to get/set value
 428 //    when the name of flag is supplied.
 429 //
 430 //    A flag can be made as "product_rw" only if
 431 //    - the VM implementation supports dynamic setting of the flag.
 432 //      This implies that the VM must *always* query the flag variable
 433 //      and not reuse state related to the flag state at any given time.
 434 //
 435 // Note that when there is a need to support develop flags to be writeable,
 436 // it can be done in the same way as product_rw.
 437 
 438 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 439                                                                             \
 440   lp64_product(bool, UseCompressedOops, false,                              \
 441             "Use 32-bit object references in 64-bit VM  "                   \
 442             "lp64_product means flag is always constant in 32 bit VM")      \
 443                                                                             \
 444   lp64_product(bool, UseCompressedKlassPointers, false,                     \
 445             "Use 32-bit klass pointers in 64-bit VM  "                      \
 446             "lp64_product means flag is always constant in 32 bit VM")      \
 447                                                                             \
 448   notproduct(bool, CheckCompressedOops, true,                               \
 449             "generate checks in encoding/decoding code in debug VM")        \
 450                                                                             \
 451   product_pd(uintx, HeapBaseMinAddress,                                     \
 452             "OS specific low limit for heap base address")                  \
 453                                                                             \
 454   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 455             "Print compressed oops base address and encoding mode")         \
 456                                                                             \
 457   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 458           "Default object alignment in bytes, 8 is minimum")                \
 459                                                                             \
 460   product(bool, AssumeMP, false,                                            \
 461           "Instruct the VM to assume multiple processors are available")    \
 462                                                                             \
 463   /* UseMembar is theoretically a temp flag used for memory barrier         \
 464    * removal testing.  It was supposed to be removed before FCS but has     \
 465    * been re-added (see 6401008) */                                         \
 466   product_pd(bool, UseMembar,                                               \
 467           "(Unstable) Issues membars on thread state transitions")          \
 468                                                                             \
 469   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 470    * that don't support it.  This will be replaced by processor detection   \
 471    * logic.                                                                 \
 472    */                                                                       \
 473   product(bool, UsePPCLWSYNC, true,                                         \
 474           "Use lwsync instruction if true, else use slower sync")           \
 475                                                                             \
 476   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 477           "Whether to clean the chunk pool asynchronously")                 \
 478                                                                             \
 479   /* Temporary: See 6948537 */                                              \
 480   experimental(bool, UseMemSetInBOT, true,                                  \
 481           "(Unstable) uses memset in BOT updates in GC code")               \
 482                                                                             \
 483   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 484           "Enable normal processing of flags relating to field diagnostics")\
 485                                                                             \
 486   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 487           "Enable normal processing of flags relating to experimental features")\
 488                                                                             \
 489   product(bool, JavaMonitorsInStackTrace, true,                             \
 490           "Print info. about Java monitor locks when the stacks are dumped")\
 491                                                                             \
 492   product_pd(bool, UseLargePages,                                           \
 493           "Use large page memory")                                          \
 494                                                                             \
 495   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 496           "Allocate large pages individually for better affinity")          \
 497                                                                             \
 498   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 499           "Fail large pages individual allocation")                         \
 500                                                                             \
 501   develop(bool, TracePageSizes, false,                                      \
 502           "Trace page size selection and usage.")                           \
 503                                                                             \
 504   product(bool, UseNUMA, false,                                             \
 505           "Use NUMA if available")                                          \
 506                                                                             \
 507   product(bool, UseNUMAInterleaving, false,                                 \
 508           "Interleave memory across NUMA nodes if available")               \
 509                                                                             \
 510   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 511           "Granularity to use for NUMA interleaving on Windows OS")         \
 512                                                                             \
 513   product(bool, ForceNUMA, false,                                           \
 514           "Force NUMA optimizations on single-node/UMA systems")            \
 515                                                                             \
 516   product(intx, NUMAChunkResizeWeight, 20,                                  \
 517           "Percentage (0-100) used to weight the current sample when "      \
 518           "computing exponentially decaying average for "                   \
 519           "AdaptiveNUMAChunkSizing")                                        \
 520                                                                             \
 521   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 522           "Do not reallocate more that this amount per collection")         \
 523                                                                             \
 524   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 525           "Enable adaptive chunk sizing for NUMA")                          \
 526                                                                             \
 527   product(bool, NUMAStats, false,                                           \
 528           "Print NUMA stats in detailed heap information")                  \
 529                                                                             \
 530   product(intx, NUMAPageScanRate, 256,                                      \
 531           "Maximum number of pages to include in the page scan procedure")  \
 532                                                                             \
 533   product_pd(bool, NeedsDeoptSuspend,                                       \
 534           "True for register window machines (sparc/ia64)")                 \
 535                                                                             \
 536   product(intx, UseSSE, 99,                                                 \
 537           "Highest supported SSE instructions set on x86/x64")              \
 538                                                                             \
 539   product(bool, UseAES, false,                                              \
 540           "Control whether AES instructions can be used on x86/x64")        \
 541                                                                             \
 542   product(intx, UseAVX, 99,                                                 \
 543           "Highest supported AVX instructions set on x86/x64")              \
 544                                                                             \
 545   product(bool, UseCLMUL, false,                                            \
 546           "Control whether CLMUL instructions can be used on x86/x64")      \
 547                                                                             \
 548   product(uintx, LargePageSizeInBytes, 0,                                   \
 549           "Large page size (0 to let VM choose the page size")              \
 550                                                                             \
 551   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 552           "Use large pages if max heap is at least this big")               \
 553                                                                             \
 554   product(bool, ForceTimeHighResolution, false,                             \
 555           "Using high time resolution(For Win32 only)")                     \
 556                                                                             \
 557   develop(bool, TraceItables, false,                                        \
 558           "Trace initialization and use of itables")                        \
 559                                                                             \
 560   develop(bool, TracePcPatching, false,                                     \
 561           "Trace usage of frame::patch_pc")                                 \
 562                                                                             \
 563   develop(bool, TraceJumps, false,                                          \
 564           "Trace assembly jumps in thread ring buffer")                     \
 565                                                                             \
 566   develop(bool, TraceRelocator, false,                                      \
 567           "Trace the bytecode relocator")                                   \
 568                                                                             \
 569   develop(bool, TraceLongCompiles, false,                                   \
 570           "Print out every time compilation is longer than "                \
 571           "a given threashold")                                             \
 572                                                                             \
 573   develop(bool, SafepointALot, false,                                       \
 574           "Generates a lot of safepoints. Works with "                      \
 575           "GuaranteedSafepointInterval")                                    \
 576                                                                             \
 577   product_pd(bool, BackgroundCompilation,                                   \
 578           "A thread requesting compilation is not blocked during "          \
 579           "compilation")                                                    \
 580                                                                             \
 581   product(bool, PrintVMQWaitTime, false,                                    \
 582           "Prints out the waiting time in VM operation queue")              \
 583                                                                             \
 584   develop(bool, NoYieldsInMicrolock, false,                                 \
 585           "Disable yields in microlock")                                    \
 586                                                                             \
 587   develop(bool, TraceOopMapGeneration, false,                               \
 588           "Shows oopmap generation")                                        \
 589                                                                             \
 590   product(bool, MethodFlushing, true,                                       \
 591           "Reclamation of zombie and not-entrant methods")                  \
 592                                                                             \
 593   develop(bool, VerifyStack, false,                                         \
 594           "Verify stack of each thread when it is entering a runtime call") \
 595                                                                             \
 596   diagnostic(bool, ForceUnreachable, false,                                 \
 597           "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
 598                                                                             \
 599   notproduct(bool, StressDerivedPointers, false,                            \
 600           "Force scavenge when a derived pointers is detected on stack "    \
 601           "after rtm call")                                                 \
 602                                                                             \
 603   develop(bool, TraceDerivedPointers, false,                                \
 604           "Trace traversal of derived pointers on stack")                   \
 605                                                                             \
 606   notproduct(bool, TraceCodeBlobStacks, false,                              \
 607           "Trace stack-walk of codeblobs")                                  \
 608                                                                             \
 609   product(bool, PrintJNIResolving, false,                                   \
 610           "Used to implement -v:jni")                                       \
 611                                                                             \
 612   notproduct(bool, PrintRewrites, false,                                    \
 613           "Print methods that are being rewritten")                         \
 614                                                                             \
 615   product(bool, UseInlineCaches, true,                                      \
 616           "Use Inline Caches for virtual calls ")                           \
 617                                                                             \
 618   develop(bool, InlineArrayCopy, true,                                      \
 619           "inline arraycopy native that is known to be part of "            \
 620           "base library DLL")                                               \
 621                                                                             \
 622   develop(bool, InlineObjectHash, true,                                     \
 623           "inline Object::hashCode() native that is known to be part "      \
 624           "of base library DLL")                                            \
 625                                                                             \
 626   develop(bool, InlineNatives, true,                                        \
 627           "inline natives that are known to be part of base library DLL")   \
 628                                                                             \
 629   develop(bool, InlineMathNatives, true,                                    \
 630           "inline SinD, CosD, etc.")                                        \
 631                                                                             \
 632   develop(bool, InlineClassNatives, true,                                   \
 633           "inline Class.isInstance, etc")                                   \
 634                                                                             \
 635   develop(bool, InlineThreadNatives, true,                                  \
 636           "inline Thread.currentThread, etc")                               \
 637                                                                             \
 638   develop(bool, InlineUnsafeOps, true,                                      \
 639           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 640                                                                             \
 641   product(bool, CriticalJNINatives, true,                                   \
 642           "check for critical JNI entry points")                            \
 643                                                                             \
 644   notproduct(bool, StressCriticalJNINatives, false,                         \
 645             "Exercise register saving code in critical natives")            \
 646                                                                             \
 647   product(bool, UseSSE42Intrinsics, false,                                  \
 648           "SSE4.2 versions of intrinsics")                                  \
 649                                                                             \
 650   product(bool, UseAESIntrinsics, false,                                    \
 651           "use intrinsics for AES versions of crypto")                      \
 652                                                                             \
 653   develop(bool, TraceCallFixup, false,                                      \
 654           "traces all call fixups")                                         \
 655                                                                             \
 656   develop(bool, DeoptimizeALot, false,                                      \
 657           "deoptimize at every exit from the runtime system")               \
 658                                                                             \
 659   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 660           "a comma separated list of bcis to deoptimize at")                \
 661                                                                             \
 662   product(bool, DeoptimizeRandom, false,                                    \
 663           "deoptimize random frames on random exit from the runtime system")\
 664                                                                             \
 665   notproduct(bool, ZombieALot, false,                                       \
 666           "creates zombies (non-entrant) at exit from the runt. system")    \
 667                                                                             \
 668   product(bool, UnlinkSymbolsALot, false,                                   \
 669           "unlink unreferenced symbols from the symbol table at safepoints")\
 670                                                                             \
 671   notproduct(bool, WalkStackALot, false,                                    \
 672           "trace stack (no print) at every exit from the runtime system")   \
 673                                                                             \
 674   product(bool, Debugging, false,                                           \
 675           "set when executing debug methods in debug.ccp "                  \
 676           "(to prevent triggering assertions)")                             \
 677                                                                             \
 678   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 679           "Enable strict checks that safepoints cannot happen for threads " \
 680           "that used No_Safepoint_Verifier")                                \
 681                                                                             \
 682   notproduct(bool, VerifyLastFrame, false,                                  \
 683           "Verify oops on last frame on entry to VM")                       \
 684                                                                             \
 685   develop(bool, TraceHandleAllocation, false,                               \
 686           "Prints out warnings when suspicious many handles are allocated") \
 687                                                                             \
 688   product(bool, UseCompilerSafepoints, true,                                \
 689           "Stop at safepoints in compiled code")                            \
 690                                                                             \
 691   product(bool, FailOverToOldVerifier, true,                                \
 692           "fail over to old verifier when split verifier fails")            \
 693                                                                             \
 694   develop(bool, ShowSafepointMsgs, false,                                   \
 695           "Show msg. about safepoint synch.")                               \
 696                                                                             \
 697   product(bool, SafepointTimeout, false,                                    \
 698           "Time out and warn or fail after SafepointTimeoutDelay "          \
 699           "milliseconds if failed to reach safepoint")                      \
 700                                                                             \
 701   develop(bool, DieOnSafepointTimeout, false,                               \
 702           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 703                                                                             \
 704   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 705   /* typically, at most a few retries are needed */                         \
 706   product(intx, SuspendRetryCount, 50,                                      \
 707           "Maximum retry count for an external suspend request")            \
 708                                                                             \
 709   product(intx, SuspendRetryDelay, 5,                                       \
 710           "Milliseconds to delay per retry (* current_retry_count)")        \
 711                                                                             \
 712   product(bool, AssertOnSuspendWaitFailure, false,                          \
 713           "Assert/Guarantee on external suspend wait failure")              \
 714                                                                             \
 715   product(bool, TraceSuspendWaitFailures, false,                            \
 716           "Trace external suspend wait failures")                           \
 717                                                                             \
 718   product(bool, MaxFDLimit, true,                                           \
 719           "Bump the number of file descriptors to max in solaris.")         \
 720                                                                             \
 721   diagnostic(bool, LogEvents, true,                                         \
 722              "Enable the various ring buffer event logs")                   \
 723                                                                             \
 724   diagnostic(intx, LogEventsBufferEntries, 10,                              \
 725              "Enable the various ring buffer event logs")                   \
 726                                                                             \
 727   product(bool, BytecodeVerificationRemote, true,                           \
 728           "Enables the Java bytecode verifier for remote classes")          \
 729                                                                             \
 730   product(bool, BytecodeVerificationLocal, false,                           \
 731           "Enables the Java bytecode verifier for local classes")           \
 732                                                                             \
 733   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 734           "Force exceptions on FP stack under/overflow")                    \
 735                                                                             \
 736   develop(bool, VerifyStackAtCalls, false,                                  \
 737           "Verify that the stack pointer is unchanged after calls")         \
 738                                                                             \
 739   develop(bool, TraceJavaAssertions, false,                                 \
 740           "Trace java language assertions")                                 \
 741                                                                             \
 742   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 743           "temporary - see javaClasses.cpp")                                \
 744                                                                             \
 745   notproduct(bool, PrintMallocFree, false,                                  \
 746           "Trace calls to C heap malloc/free allocation")                   \
 747                                                                             \
 748   product(bool, PrintOopAddress, false,                                     \
 749           "Always print the location of the oop")                           \
 750                                                                             \
 751   notproduct(bool, VerifyCodeCacheOften, false,                             \
 752           "Verify compiled-code cache often")                               \
 753                                                                             \
 754   develop(bool, ZapDeadCompiledLocals, false,                               \
 755           "Zap dead locals in compiler frames")                             \
 756                                                                             \
 757   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 758           "Zap dead locals (old version, zaps all frames when "             \
 759           "entering the VM")                                                \
 760                                                                             \
 761   notproduct(bool, CheckOopishValues, false,                                \
 762           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 763                                                                             \
 764   develop(bool, UseMallocOnly, false,                                       \
 765           "use only malloc/free for allocation (no resource area/arena)")   \
 766                                                                             \
 767   develop(bool, PrintMalloc, false,                                         \
 768           "print all malloc/free calls")                                    \
 769                                                                             \
 770   develop(bool, PrintMallocStatistics, false,                               \
 771           "print malloc/free statistics")                                   \
 772                                                                             \
 773   develop(bool, ZapResourceArea, trueInDebug,                               \
 774           "Zap freed resource/arena space with 0xABABABAB")                 \
 775                                                                             \
 776   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 777           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 778                                                                             \
 779   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 780           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 781                                                                             \
 782   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 783              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 784                                                                             \
 785   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 786           "Zap unused heap space with 0xBAADBABE")                          \
 787                                                                             \
 788   develop(bool, TraceZapUnusedHeapArea, false,                              \
 789           "Trace zapping of unused heap space")                             \
 790                                                                             \
 791   develop(bool, CheckZapUnusedHeapArea, false,                              \
 792           "Check zapping of unused heap space")                             \
 793                                                                             \
 794   develop(bool, ZapFillerObjects, trueInDebug,                              \
 795           "Zap filler objects with 0xDEAFBABE")                             \
 796                                                                             \
 797   develop(bool, PrintVMMessages, true,                                      \
 798           "Print vm messages on console")                                   \
 799                                                                             \
 800   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 801           "Print the time the application has been running")                \
 802                                                                             \
 803   product(bool, PrintGCApplicationStoppedTime, false,                       \
 804           "Print the time the application has been stopped")                \
 805                                                                             \
 806   diagnostic(bool, VerboseVerification, false,                              \
 807              "Display detailed verification details")                       \
 808                                                                             \
 809   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 810           "If > 0, provokes an error after VM initialization; the value"    \
 811           "determines which error to provoke.  See test_error_handler()"    \
 812           "in debug.cpp.")                                                  \
 813                                                                             \
 814   develop(bool, Verbose, false,                                             \
 815           "Prints additional debugging information from other modes")       \
 816                                                                             \
 817   develop(bool, PrintMiscellaneous, false,                                  \
 818           "Prints uncategorized debugging information (requires +Verbose)") \
 819                                                                             \
 820   develop(bool, WizardMode, false,                                          \
 821           "Prints much more debugging information")                         \
 822                                                                             \
 823   product(bool, ShowMessageBoxOnError, false,                               \
 824           "Keep process alive on VM fatal error")                           \
 825                                                                             \
 826   product(bool, CreateMinidumpOnCrash, false,                               \
 827           "Create minidump on VM fatal error")                              \
 828                                                                             \
 829   product_pd(bool, UseOSErrorReporting,                                     \
 830           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 831                                                                             \
 832   product(bool, SuppressFatalErrorMessage, false,                           \
 833           "Do NO Fatal Error report [Avoid deadlock]")                      \
 834                                                                             \
 835   product(ccstrlist, OnError, "",                                           \
 836           "Run user-defined commands on fatal error; see VMError.cpp "      \
 837           "for examples")                                                   \
 838                                                                             \
 839   product(ccstrlist, OnOutOfMemoryError, "",                                \
 840           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 841                                                                             \
 842   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 843           "Dump heap to file before any major stop-world GC")               \
 844                                                                             \
 845   manageable(bool, HeapDumpAfterFullGC, false,                              \
 846           "Dump heap to file after any major stop-world GC")                \
 847                                                                             \
 848   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 849           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 850                                                                             \
 851   manageable(ccstr, HeapDumpPath, NULL,                                     \
 852           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 853           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 854           "in the working directory)")                                      \
 855                                                                             \
 856   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 857           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 858           "when the heap usage is larger than this")                        \
 859                                                                             \
 860   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 861           "Approximate segment size when generating a segmented heap dump") \
 862                                                                             \
 863   develop(bool, BreakAtWarning, false,                                      \
 864           "Execute breakpoint upon encountering VM warning")                \
 865                                                                             \
 866   develop(bool, TraceVMOperation, false,                                    \
 867           "Trace vm operations")                                            \
 868                                                                             \
 869   develop(bool, UseFakeTimers, false,                                       \
 870           "Tells whether the VM should use system time or a fake timer")    \
 871                                                                             \
 872   product(ccstr, NativeMemoryTracking, "off",                               \
 873           "Native memory tracking options")                                 \
 874                                                                             \
 875   diagnostic(bool, PrintNMTStatistics, false,                               \
 876           "Print native memory tracking summary data if it is on")          \
 877                                                                             \
 878   diagnostic(bool, AutoShutdownNMT, true,                                   \
 879           "Automatically shutdown native memory tracking under stress "     \
 880           "situation. When set to false, native memory tracking tries to "  \
 881           "stay alive at the expense of JVM performance")                   \
 882                                                                             \
 883   diagnostic(bool, LogCompilation, false,                                   \
 884           "Log compilation activity in detail to hotspot.log or LogFile")   \
 885                                                                             \
 886   product(bool, PrintCompilation, false,                                    \
 887           "Print compilations")                                             \
 888                                                                             \
 889   diagnostic(bool, TraceNMethodInstalls, false,                             \
 890              "Trace nmethod intallation")                                   \
 891                                                                             \
 892   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 893              "0: do not allow scavengable oops in the code cache; "         \
 894              "1: allow scavenging from the code cache; "                    \
 895              "2: emit as many constants as the compiler can see")           \
 896                                                                             \
 897   product(bool, AlwaysRestoreFPU, false,                                    \
 898           "Restore the FPU control word after every JNI call (expensive)")  \
 899                                                                             \
 900   diagnostic(bool, PrintCompilation2, false,                                \
 901           "Print additional statistics per compilation")                    \
 902                                                                             \
 903   diagnostic(bool, PrintAdapterHandlers, false,                             \
 904           "Print code generated for i2c/c2i adapters")                      \
 905                                                                             \
 906   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 907           "Verify that i2c/c2i adapters are called properly")               \
 908                                                                             \
 909   develop(bool, VerifyAdapterSharing, false,                                \
 910           "Verify that the code for shared adapters is the equivalent")     \
 911                                                                             \
 912   diagnostic(bool, PrintAssembly, false,                                    \
 913           "Print assembly code (using external disassembler.so)")           \
 914                                                                             \
 915   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 916           "Options string passed to disassembler.so")                       \
 917                                                                             \
 918   diagnostic(bool, PrintNMethods, false,                                    \
 919           "Print assembly code for nmethods when generated")                \
 920                                                                             \
 921   diagnostic(bool, PrintNativeNMethods, false,                              \
 922           "Print assembly code for native nmethods when generated")         \
 923                                                                             \
 924   develop(bool, PrintDebugInfo, false,                                      \
 925           "Print debug information for all nmethods when generated")        \
 926                                                                             \
 927   develop(bool, PrintRelocations, false,                                    \
 928           "Print relocation information for all nmethods when generated")   \
 929                                                                             \
 930   develop(bool, PrintDependencies, false,                                   \
 931           "Print dependency information for all nmethods when generated")   \
 932                                                                             \
 933   develop(bool, PrintExceptionHandlers, false,                              \
 934           "Print exception handler tables for all nmethods when generated") \
 935                                                                             \
 936   develop(bool, StressCompiledExceptionHandlers, false,                     \
 937          "Exercise compiled exception handlers")                            \
 938                                                                             \
 939   develop(bool, InterceptOSException, false,                                \
 940           "Starts debugger when an implicit OS (e.g., NULL) "               \
 941           "exception happens")                                              \
 942                                                                             \
 943   product(bool, PrintCodeCache, false,                                      \
 944           "Print the code cache memory usage when exiting")                 \
 945                                                                             \
 946   develop(bool, PrintCodeCache2, false,                                     \
 947           "Print detailed usage info on the code cache when exiting")       \
 948                                                                             \
 949   product(bool, PrintCodeCacheOnCompilation, false,                         \
 950           "Print the code cache memory usage each time a method is compiled") \
 951                                                                             \
 952   diagnostic(bool, PrintStubCode, false,                                    \
 953           "Print generated stub code")                                      \
 954                                                                             \
 955   product(bool, StackTraceInThrowable, true,                                \
 956           "Collect backtrace in throwable when exception happens")          \
 957                                                                             \
 958   product(bool, OmitStackTraceInFastThrow, true,                            \
 959           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 960                                                                             \
 961   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 962           "Prints byte code statictics when dumping profiler output")       \
 963                                                                             \
 964   product(bool, ProfilerRecordPC, false,                                    \
 965           "Collects tick for each 16 byte interval of compiled code")       \
 966                                                                             \
 967   product(bool, ProfileVM, false,                                           \
 968           "Profiles ticks that fall within VM (either in the VM Thread "    \
 969           "or VM code called through stubs)")                               \
 970                                                                             \
 971   product(bool, ProfileIntervals, false,                                    \
 972           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 973                                                                             \
 974   notproduct(bool, ProfilerCheckIntervals, false,                           \
 975           "Collect and print info on spacing of profiler ticks")            \
 976                                                                             \
 977   develop(bool, PrintJVMWarnings, false,                                    \
 978           "Prints warnings for unimplemented JVM functions")                \
 979                                                                             \
 980   product(bool, PrintWarnings, true,                                        \
 981           "Prints JVM warnings to output stream")                           \
 982                                                                             \
 983   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 984           "Prints warnings for stalled SpinLocks")                          \
 985                                                                             \
 986   product(bool, RegisterFinalizersAtInit, true,                             \
 987           "Register finalizable objects at end of Object.<init> or "        \
 988           "after allocation")                                               \
 989                                                                             \
 990   develop(bool, RegisterReferences, true,                                   \
 991           "Tells whether the VM should register soft/weak/final/phantom "   \
 992           "references")                                                     \
 993                                                                             \
 994   develop(bool, IgnoreRewrites, false,                                      \
 995           "Supress rewrites of bytecodes in the oopmap generator. "         \
 996           "This is unsafe!")                                                \
 997                                                                             \
 998   develop(bool, PrintCodeCacheExtension, false,                             \
 999           "Print extension of code cache")                                  \
1000                                                                             \
1001   develop(bool, UsePrivilegedStack, true,                                   \
1002           "Enable the security JVM functions")                              \
1003                                                                             \
1004   develop(bool, ProtectionDomainVerification, true,                         \
1005           "Verifies protection domain before resolution in system "         \
1006           "dictionary")                                                     \
1007                                                                             \
1008   product(bool, ClassUnloading, true,                                       \
1009           "Do unloading of classes")                                        \
1010                                                                             \
1011   develop(bool, DisableStartThread, false,                                  \
1012           "Disable starting of additional Java threads "                    \
1013           "(for debugging only)")                                           \
1014                                                                             \
1015   develop(bool, MemProfiling, false,                                        \
1016           "Write memory usage profiling to log file")                       \
1017                                                                             \
1018   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1019           "Prints the system dictionary at exit")                           \
1020                                                                             \
1021   experimental(intx, PredictedLoadedClassCount, 0,                          \
1022           "Experimental: Tune loaded class cache starting size.")           \
1023                                                                             \
1024   diagnostic(bool, UnsyncloadClass, false,                                  \
1025           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1026           "class loader  must call VM synchronized for findClass "          \
1027           "and defineClass.")                                               \
1028                                                                             \
1029   product(bool, AlwaysLockClassLoader, false,                               \
1030           "Require the VM to acquire the class loader lock before calling " \
1031           "loadClass() even for class loaders registering "                 \
1032           "as parallel capable")                                            \
1033                                                                             \
1034   product(bool, AllowParallelDefineClass, false,                            \
1035           "Allow parallel defineClass requests for class loaders "          \
1036           "registering as parallel capable")                                \
1037                                                                             \
1038   product(bool, MustCallLoadClassInternal, false,                           \
1039           "Call loadClassInternal() rather than loadClass()")               \
1040                                                                             \
1041   product_pd(bool, DontYieldALot,                                           \
1042           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1043                                                                             \
1044   product_pd(bool, ConvertSleepToYield,                                     \
1045           "Converts sleep(0) to thread yield "                              \
1046           "(may be off for SOLARIS to improve GUI)")                        \
1047                                                                             \
1048   product(bool, ConvertYieldToSleep, false,                                 \
1049           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1050           "behavior (SOLARIS only)")                                        \
1051                                                                             \
1052   product(bool, UseBoundThreads, true,                                      \
1053           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1054                                                                             \
1055   develop(bool, UseDetachedThreads, true,                                   \
1056           "Use detached threads that are recycled upon termination "        \
1057           "(for SOLARIS only)")                                             \
1058                                                                             \
1059   product(bool, UseLWPSynchronization, true,                                \
1060           "Use LWP-based instead of libthread-based synchronization "       \
1061           "(SPARC only)")                                                   \
1062                                                                             \
1063   product(ccstr, SyncKnobs, NULL,                                           \
1064           "(Unstable) Various monitor synchronization tunables")            \
1065                                                                             \
1066   product(intx, EmitSync, 0,                                                \
1067           "(Unsafe,Unstable) "                                              \
1068           " Controls emission of inline sync fast-path code")               \
1069                                                                             \
1070   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1071                                                                             \
1072   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1073                                                                             \
1074   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1075                                                                             \
1076   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1077                                                                             \
1078   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1079                                                                             \
1080   product(intx, hashCode, 5,                                                \
1081          "(Unstable) select hashCode generation algorithm" )                \
1082                                                                             \
1083   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1084          "(Unstable, Linux-specific)"                                       \
1085          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1086                                                                             \
1087   product(bool, FilterSpuriousWakeups, true,                                \
1088           "Prevent spurious or premature wakeups from object.wait "         \
1089           "(Solaris only)")                                                 \
1090                                                                             \
1091   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1092   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1093   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1094                                                                             \
1095   develop(bool, UsePthreads, false,                                         \
1096           "Use pthread-based instead of libthread-based synchronization "   \
1097           "(SPARC only)")                                                   \
1098                                                                             \
1099   product(bool, AdjustConcurrency, false,                                   \
1100           "call thr_setconcurrency at thread create time to avoid "         \
1101           "LWP starvation on MP systems (For Solaris Only)")                \
1102                                                                             \
1103   product(bool, ReduceSignalUsage, false,                                   \
1104           "Reduce the use of OS signals in Java and/or the VM")             \
1105                                                                             \
1106   develop_pd(bool, ShareVtableStubs,                                        \
1107           "Share vtable stubs (smaller code but worse branch prediction")   \
1108                                                                             \
1109   develop(bool, LoadLineNumberTables, true,                                 \
1110           "Tells whether the class file parser loads line number tables")   \
1111                                                                             \
1112   develop(bool, LoadLocalVariableTables, true,                              \
1113           "Tells whether the class file parser loads local variable tables")\
1114                                                                             \
1115   develop(bool, LoadLocalVariableTypeTables, true,                          \
1116           "Tells whether the class file parser loads local variable type tables")\
1117                                                                             \
1118   product(bool, AllowUserSignalHandlers, false,                             \
1119           "Do not complain if the application installs signal handlers "    \
1120           "(Solaris & Linux only)")                                         \
1121                                                                             \
1122   product(bool, UseSignalChaining, true,                                    \
1123           "Use signal-chaining to invoke signal handlers installed "        \
1124           "by the application (Solaris & Linux only)")                      \
1125                                                                             \
1126   product(bool, UseAltSigs, false,                                          \
1127           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1128           "internal signals (Solaris only)")                                \
1129                                                                             \
1130   product(bool, AllowJNIEnvProxy, false,                                    \
1131           "Allow JNIEnv proxies for jdbx")                                  \
1132                                                                             \
1133   product(bool, JNIDetachReleasesMonitors, true,                            \
1134           "JNI DetachCurrentThread releases monitors owned by thread")      \
1135                                                                             \
1136   product(bool, RestoreMXCSROnJNICalls, false,                              \
1137           "Restore MXCSR when returning from JNI calls")                    \
1138                                                                             \
1139   product(bool, CheckJNICalls, false,                                       \
1140           "Verify all arguments to JNI calls")                              \
1141                                                                             \
1142   product(bool, UseFastJNIAccessors, true,                                  \
1143           "Use optimized versions of Get<Primitive>Field")                  \
1144                                                                             \
1145   product(bool, EagerXrunInit, false,                                       \
1146           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1147           " but not all -Xrun libraries may support the state of the VM at this time") \
1148                                                                             \
1149   product(bool, PreserveAllAnnotations, false,                              \
1150           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1151                                                                             \
1152   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1153           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1154                                                                             \
1155   product(bool, LazyBootClassLoader, true,                                  \
1156           "Enable/disable lazy opening of boot class path entries")         \
1157                                                                             \
1158   product(bool, UseXMMForArrayCopy, false,                                  \
1159           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1160                                                                             \
1161   product(intx, FieldsAllocationStyle, 1,                                   \
1162           "0 - type based with oops first, 1 - with oops last, "            \
1163           "2 - oops in super and sub classes are together")                 \
1164                                                                             \
1165   product(bool, CompactFields, true,                                        \
1166           "Allocate nonstatic fields in gaps between previous fields")      \
1167                                                                             \
1168   notproduct(bool, PrintCompactFieldsSavings, false,                        \
1169           "Print how many words were saved with CompactFields")             \
1170                                                                             \
1171   notproduct(bool, PrintFieldLayout, false,                                 \
1172           "Print field layout for each class")                              \
1173                                                                             \
1174   product(intx, ContendedPaddingWidth, 128,                                 \
1175           "How many bytes to pad the fields/classes marked @Contended with")\
1176                                                                             \
1177   product(bool, EnableContended, true,                                      \
1178           "Enable @Contended annotation support")                           \
1179                                                                             \
1180   product(bool, RestrictContended, true,                                    \
1181           "Restrict @Contended to trusted classes")                         \
1182                                                                             \
1183   product(bool, UseBiasedLocking, true,                                     \
1184           "Enable biased locking in JVM")                                   \
1185                                                                             \
1186   product(intx, BiasedLockingStartupDelay, 4000,                            \
1187           "Number of milliseconds to wait before enabling biased locking")  \
1188                                                                             \
1189   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1190           "Print statistics of biased locking in JVM")                      \
1191                                                                             \
1192   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1193           "Threshold of number of revocations per type to try to "          \
1194           "rebias all objects in the heap of that type")                    \
1195                                                                             \
1196   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1197           "Threshold of number of revocations per type to permanently "     \
1198           "revoke biases of all objects in the heap of that type")          \
1199                                                                             \
1200   product(intx, BiasedLockingDecayTime, 25000,                              \
1201           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1202           "type after previous bulk rebias")                                \
1203                                                                             \
1204   /* tracing */                                                             \
1205                                                                             \
1206   notproduct(bool, TraceRuntimeCalls, false,                                \
1207           "Trace run-time calls")                                           \
1208                                                                             \
1209   develop(bool, TraceJNICalls, false,                                       \
1210           "Trace JNI calls")                                                \
1211                                                                             \
1212   notproduct(bool, TraceJVMCalls, false,                                    \
1213           "Trace JVM calls")                                                \
1214                                                                             \
1215   product(ccstr, TraceJVMTI, NULL,                                          \
1216           "Trace flags for JVMTI functions and events")                     \
1217                                                                             \
1218   /* This option can change an EMCP method into an obsolete method. */      \
1219   /* This can affect tests that except specific methods to be EMCP. */      \
1220   /* This option should be used with caution. */                            \
1221   product(bool, StressLdcRewrite, false,                                    \
1222           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1223                                                                             \
1224   product(intx, TraceRedefineClasses, 0,                                    \
1225           "Trace level for JVMTI RedefineClasses")                          \
1226                                                                             \
1227   develop(bool, StressMethodComparator, false,                              \
1228           "run the MethodComparator on all loaded methods")                 \
1229                                                                             \
1230   /* change to false by default sometime after Mustang */                   \
1231   product(bool, VerifyMergedCPBytecodes, true,                              \
1232           "Verify bytecodes after RedefineClasses constant pool merging")   \
1233                                                                             \
1234   develop(bool, TraceJNIHandleAllocation, false,                            \
1235           "Trace allocation/deallocation of JNI handle blocks")             \
1236                                                                             \
1237   develop(bool, TraceThreadEvents, false,                                   \
1238           "Trace all thread events")                                        \
1239                                                                             \
1240   develop(bool, TraceBytecodes, false,                                      \
1241           "Trace bytecode execution")                                       \
1242                                                                             \
1243   develop(bool, TraceClassInitialization, false,                            \
1244           "Trace class initialization")                                     \
1245                                                                             \
1246   develop(bool, TraceExceptions, false,                                     \
1247           "Trace exceptions")                                               \
1248                                                                             \
1249   develop(bool, TraceICs, false,                                            \
1250           "Trace inline cache changes")                                     \
1251                                                                             \
1252   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1253           "Trace method invocation counter overflow")                       \
1254                                                                             \
1255   develop(bool, TraceInlineCacheClearing, false,                            \
1256           "Trace clearing of inline caches in nmethods")                    \
1257                                                                             \
1258   develop(bool, TraceDependencies, false,                                   \
1259           "Trace dependencies")                                             \
1260                                                                             \
1261   develop(bool, VerifyDependencies, trueInDebug,                            \
1262          "Exercise and verify the compilation dependency mechanism")        \
1263                                                                             \
1264   develop(bool, TraceNewOopMapGeneration, false,                            \
1265           "Trace OopMapGeneration")                                         \
1266                                                                             \
1267   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1268           "Trace OopMapGeneration: print detailed cell states")             \
1269                                                                             \
1270   develop(bool, TimeOopMap, false,                                          \
1271           "Time calls to GenerateOopMap::compute_map() in sum")             \
1272                                                                             \
1273   develop(bool, TimeOopMap2, false,                                         \
1274           "Time calls to GenerateOopMap::compute_map() individually")       \
1275                                                                             \
1276   develop(bool, TraceMonitorMismatch, false,                                \
1277           "Trace monitor matching failures during OopMapGeneration")        \
1278                                                                             \
1279   develop(bool, TraceOopMapRewrites, false,                                 \
1280           "Trace rewritting of method oops during oop map generation")      \
1281                                                                             \
1282   develop(bool, TraceSafepoint, false,                                      \
1283           "Trace safepoint operations")                                     \
1284                                                                             \
1285   develop(bool, TraceICBuffer, false,                                       \
1286           "Trace usage of IC buffer")                                       \
1287                                                                             \
1288   develop(bool, TraceCompiledIC, false,                                     \
1289           "Trace changes of compiled IC")                                   \
1290                                                                             \
1291   notproduct(bool, TraceZapDeadLocals, false,                               \
1292           "Trace zapping dead locals")                                      \
1293                                                                             \
1294   develop(bool, TraceStartupTime, false,                                    \
1295           "Trace setup time")                                               \
1296                                                                             \
1297   develop(bool, TraceProtectionDomainVerification, false,                   \
1298           "Trace protection domain verifcation")                            \
1299                                                                             \
1300   develop(bool, TraceClearedExceptions, false,                              \
1301           "Prints when an exception is forcibly cleared")                   \
1302                                                                             \
1303   product(bool, TraceClassResolution, false,                                \
1304           "Trace all constant pool resolutions (for debugging)")            \
1305                                                                             \
1306   product(bool, TraceBiasedLocking, false,                                  \
1307           "Trace biased locking in JVM")                                    \
1308                                                                             \
1309   product(bool, TraceMonitorInflation, false,                               \
1310           "Trace monitor inflation in JVM")                                 \
1311                                                                             \
1312   /* gc */                                                                  \
1313                                                                             \
1314   product(bool, UseSerialGC, false,                                         \
1315           "Use the serial garbage collector")                               \
1316                                                                             \
1317   product(bool, UseG1GC, false,                                             \
1318           "Use the Garbage-First garbage collector")                        \
1319                                                                             \
1320   product(bool, UseParallelGC, false,                                       \
1321           "Use the Parallel Scavenge garbage collector")                    \
1322                                                                             \
1323   product(bool, UseParallelOldGC, false,                                    \
1324           "Use the Parallel Old garbage collector")                         \
1325                                                                             \
1326   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1327           "How often should we maximally compact the heap (not allowing "   \
1328           "any dead space)")                                                \
1329                                                                             \
1330   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1331           "The collection count for the first maximum compaction")          \
1332                                                                             \
1333   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1334           "In the Parallel Old garbage collector maximum compaction for "   \
1335           "a system GC")                                                    \
1336                                                                             \
1337   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1338           "The mean used by the par compact dead wood"                      \
1339           "limiter (a number between 0-100).")                              \
1340                                                                             \
1341   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1342           "The standard deviation used by the par compact dead wood"        \
1343           "limiter (a number between 0-100).")                              \
1344                                                                             \
1345   product(uintx, ParallelGCThreads, 0,                                      \
1346           "Number of parallel threads parallel gc will use")                \
1347                                                                             \
1348   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1349           "Dynamically choose the number of parallel threads "              \
1350           "parallel gc will use")                                           \
1351                                                                             \
1352   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1353           "Force dynamic selection of the number of"                        \
1354           "parallel threads parallel gc will use to aid debugging")         \
1355                                                                             \
1356   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1357           "Size of heap (bytes) per GC thread used in calculating the "     \
1358           "number of GC threads")                                           \
1359                                                                             \
1360   product(bool, TraceDynamicGCThreads, false,                               \
1361           "Trace the dynamic GC thread usage")                              \
1362                                                                             \
1363   develop(bool, ParallelOldGCSplitALot, false,                              \
1364           "Provoke splitting (copying data from a young gen space to"       \
1365           "multiple destination spaces)")                                   \
1366                                                                             \
1367   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1368           "How often to provoke splitting a young gen space")               \
1369                                                                             \
1370   product(uintx, ConcGCThreads, 0,                                          \
1371           "Number of threads concurrent gc will use")                       \
1372                                                                             \
1373   product(uintx, YoungPLABSize, 4096,                                       \
1374           "Size of young gen promotion labs (in HeapWords)")                \
1375                                                                             \
1376   product(uintx, OldPLABSize, 1024,                                         \
1377           "Size of old gen promotion labs (in HeapWords)")                  \
1378                                                                             \
1379   product(uintx, GCTaskTimeStampEntries, 200,                               \
1380           "Number of time stamp entries per gc worker thread")              \
1381                                                                             \
1382   product(bool, AlwaysTenure, false,                                        \
1383           "Always tenure objects in eden. (ParallelGC only)")               \
1384                                                                             \
1385   product(bool, NeverTenure, false,                                         \
1386           "Never tenure objects in eden, May tenure on overflow "           \
1387           "(ParallelGC only)")                                              \
1388                                                                             \
1389   product(bool, ScavengeBeforeFullGC, true,                                 \
1390           "Scavenge youngest generation before each full GC, "              \
1391           "used with UseParallelGC")                                        \
1392                                                                             \
1393   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1394           "Allow scavenges to occur when to_space contains objects.")       \
1395                                                                             \
1396   product(bool, UseConcMarkSweepGC, false,                                  \
1397           "Use Concurrent Mark-Sweep GC in the old generation")             \
1398                                                                             \
1399   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1400           "A System.gc() request invokes a concurrent collection;"          \
1401           " (effective only when UseConcMarkSweepGC)")                      \
1402                                                                             \
1403   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1404           "A System.gc() request invokes a concurrent collection and "      \
1405           "also unloads classes during such a concurrent gc cycle "         \
1406           "(effective only when UseConcMarkSweepGC)")                       \
1407                                                                             \
1408   product(bool, GCLockerInvokesConcurrent, false,                           \
1409           "The exit of a JNI CS necessitating a scavenge also"              \
1410           " kicks off a bkgrd concurrent collection")                       \
1411                                                                             \
1412   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1413           "How much the GC can expand the eden by while the GC locker  "    \
1414           "is active (as a percentage)")                                    \
1415                                                                             \
1416   diagnostic(intx, GCLockerRetryAllocationCount, 2,                         \
1417           "Number of times to retry allocations when"                       \
1418           " blocked by the GC locker")                                      \
1419                                                                             \
1420   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1421           "Use Adaptive Free Lists in the CMS generation")                  \
1422                                                                             \
1423   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1424           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1425                                                                             \
1426   develop(bool, RotateCMSCollectionTypes, false,                            \
1427           "Rotate the CMS collections among concurrent and STW")            \
1428                                                                             \
1429   product(bool, UseCMSBestFit, true,                                        \
1430           "Use CMS best fit allocation strategy")                           \
1431                                                                             \
1432   product(bool, UseCMSCollectionPassing, true,                              \
1433           "Use passing of collection from background to foreground")        \
1434                                                                             \
1435   product(bool, UseParNewGC, false,                                         \
1436           "Use parallel threads in the new generation.")                    \
1437                                                                             \
1438   product(bool, ParallelGCVerbose, false,                                   \
1439           "Verbose output for parallel GC.")                                \
1440                                                                             \
1441   product(intx, ParallelGCBufferWastePct, 10,                               \
1442           "wasted fraction of parallel allocation buffer.")                 \
1443                                                                             \
1444   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1445              "Retain parallel allocation buffers across scavenges; "        \
1446              " -- disabled because this currently conflicts with "          \
1447              " parallel card scanning under certain conditions ")           \
1448                                                                             \
1449   product(intx, TargetPLABWastePct, 10,                                     \
1450           "target wasted space in last buffer as pct of overall allocation")\
1451                                                                             \
1452   product(uintx, PLABWeight, 75,                                            \
1453           "Percentage (0-100) used to weight the current sample when"       \
1454           "computing exponentially decaying average for ResizePLAB.")       \
1455                                                                             \
1456   product(bool, ResizePLAB, true,                                           \
1457           "Dynamically resize (survivor space) promotion labs")             \
1458                                                                             \
1459   product(bool, PrintPLAB, false,                                           \
1460           "Print (survivor space) promotion labs sizing decisions")         \
1461                                                                             \
1462   product(intx, ParGCArrayScanChunk, 50,                                    \
1463           "Scan a subset and push remainder, if array is bigger than this") \
1464                                                                             \
1465   product(bool, ParGCUseLocalOverflow, false,                               \
1466           "Instead of a global overflow list, use local overflow stacks")   \
1467                                                                             \
1468   product(bool, ParGCTrimOverflow, true,                                    \
1469           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1470                                                                             \
1471   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1472           "Whether we should simulate work queue overflow in ParNew")       \
1473                                                                             \
1474   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1475           "An `interval' counter that determines how frequently "           \
1476           "we simulate overflow; a smaller number increases frequency")     \
1477                                                                             \
1478   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1479           "The desired number of objects to claim from the overflow list")  \
1480                                                                             \
1481   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1482           "The number of strides per worker thread that we divide up the "  \
1483           "card table scanning work into")                                  \
1484                                                                             \
1485   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1486           "The number of cards in each chunk of the parallel chunks used "  \
1487           "during card table scanning")                                     \
1488                                                                             \
1489   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1490           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1491           "parallel GC.")                                                   \
1492                                                                             \
1493   product(uintx, OldPLABWeight, 50,                                         \
1494           "Percentage (0-100) used to weight the current sample when"       \
1495           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1496                                                                             \
1497   product(bool, ResizeOldPLAB, true,                                        \
1498           "Dynamically resize (old gen) promotion labs")                    \
1499                                                                             \
1500   product(bool, PrintOldPLAB, false,                                        \
1501           "Print (old gen) promotion labs sizing decisions")                \
1502                                                                             \
1503   product(uintx, CMSOldPLABMin, 16,                                         \
1504           "Min size of CMS gen promotion lab caches per worker per blksize")\
1505                                                                             \
1506   product(uintx, CMSOldPLABMax, 1024,                                       \
1507           "Max size of CMS gen promotion lab caches per worker per blksize")\
1508                                                                             \
1509   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1510           "Nominal number of refills of CMS gen promotion lab cache"        \
1511           " per worker per block size")                                     \
1512                                                                             \
1513   product(bool, CMSOldPLABResizeQuicker, false,                             \
1514           "Whether to react on-the-fly during a scavenge to a sudden"       \
1515           " change in block demand rate")                                   \
1516                                                                             \
1517   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1518           "The tolerance of the phase-change detector for on-the-fly"       \
1519           " PLAB resizing during a scavenge")                               \
1520                                                                             \
1521   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1522           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1523           " during a scavenge")                                             \
1524                                                                             \
1525   product(bool, AlwaysPreTouch, false,                                      \
1526           "It forces all freshly committed pages to be pre-touched.")       \
1527                                                                             \
1528   product_pd(intx, CMSYoungGenPerWorker,                                    \
1529           "The maximum size of young gen chosen by default per GC worker "  \
1530           "thread available")                                               \
1531                                                                             \
1532   product(bool, CMSIncrementalMode, false,                                  \
1533           "Whether CMS GC should operate in \"incremental\" mode")          \
1534                                                                             \
1535   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1536           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1537           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1538           "value")                                                          \
1539                                                                             \
1540   product(bool, CMSIncrementalPacing, true,                                 \
1541           "Whether the CMS incremental mode duty cycle should be "          \
1542           "automatically adjusted")                                         \
1543                                                                             \
1544   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1545           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1546           "enabled (a percentage, 0-100)")                                  \
1547                                                                             \
1548   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1549           "Percentage (0-100) used to add conservatism when computing the " \
1550           "duty cycle")                                                     \
1551                                                                             \
1552   product(uintx, CMSIncrementalOffset, 0,                                   \
1553           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1554           " is shifted to the right within the period between young GCs")   \
1555                                                                             \
1556   product(uintx, CMSExpAvgFactor, 50,                                       \
1557           "Percentage (0-100) used to weight the current sample when"       \
1558           "computing exponential averages for CMS statistics.")             \
1559                                                                             \
1560   product(uintx, CMS_FLSWeight, 75,                                         \
1561           "Percentage (0-100) used to weight the current sample when"       \
1562           "computing exponentially decating averages for CMS FLS statistics.") \
1563                                                                             \
1564   product(uintx, CMS_FLSPadding, 1,                                         \
1565           "The multiple of deviation from mean to use for buffering"        \
1566           "against volatility in free list demand.")                        \
1567                                                                             \
1568   product(uintx, FLSCoalescePolicy, 2,                                      \
1569           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1570                                                                             \
1571   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1572           "CMS: Larger free blocks are always available for coalescing")    \
1573                                                                             \
1574   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1575           "CMS: the smaller the percentage the greater the coalition force")\
1576                                                                             \
1577   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1578           "CMS: the factor by which to inflate estimated demand of small"   \
1579           " block sizes to prevent coalescing with an adjoining block")     \
1580                                                                             \
1581   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1582           "CMS: the factor by which to inflate estimated demand of large"   \
1583           " block sizes to prevent coalescing with an adjoining block")     \
1584                                                                             \
1585   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1586           "CMS: the factor by which to inflate estimated demand of small"   \
1587           " block sizes to prevent splitting to supply demand for smaller"  \
1588           " blocks")                                                        \
1589                                                                             \
1590   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1591           "CMS: the factor by which to inflate estimated demand of large"   \
1592           " block sizes to prevent splitting to supply demand for smaller"  \
1593           " blocks")                                                        \
1594                                                                             \
1595   product(bool, CMSExtrapolateSweep, false,                                 \
1596           "CMS: cushion for block demand during sweep")                     \
1597                                                                             \
1598   product(uintx, CMS_SweepWeight, 75,                                       \
1599           "Percentage (0-100) used to weight the current sample when "      \
1600           "computing exponentially decaying average for inter-sweep "       \
1601           "duration")                                                       \
1602                                                                             \
1603   product(uintx, CMS_SweepPadding, 1,                                       \
1604           "The multiple of deviation from mean to use for buffering "       \
1605           "against volatility in inter-sweep duration.")                    \
1606                                                                             \
1607   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1608           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1609           "duration exceeds this threhold in milliseconds")                 \
1610                                                                             \
1611   develop(bool, CMSTraceIncrementalMode, false,                             \
1612           "Trace CMS incremental mode")                                     \
1613                                                                             \
1614   develop(bool, CMSTraceIncrementalPacing, false,                           \
1615           "Trace CMS incremental mode pacing computation")                  \
1616                                                                             \
1617   develop(bool, CMSTraceThreadState, false,                                 \
1618           "Trace the CMS thread state (enable the trace_state() method)")   \
1619                                                                             \
1620   product(bool, CMSClassUnloadingEnabled, true,                             \
1621           "Whether class unloading enabled when using CMS GC")              \
1622                                                                             \
1623   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1624           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1625           " for which classes may not be unloaded")                         \
1626                                                                             \
1627   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1628           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1629                                                                             \
1630   product(bool, UseCMSCompactAtFullCollection, true,                        \
1631           "Use mark sweep compact at full collections")                     \
1632                                                                             \
1633   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1634           "Number of CMS full collection done before compaction if > 0")    \
1635                                                                             \
1636   develop(intx, CMSDictionaryChoice, 0,                                     \
1637           "Use BinaryTreeDictionary as default in the CMS generation")      \
1638                                                                             \
1639   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1640           "Replenish an indexed free list with this number of chunks")      \
1641                                                                             \
1642   product(bool, CMSReplenishIntermediate, true,                             \
1643           "Replenish all intermediate free-list caches")                    \
1644                                                                             \
1645   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1646           "When satisfying batched demand, split blocks from the "          \
1647           "IndexedFreeList whose size is a multiple of requested size")     \
1648                                                                             \
1649   product(bool, CMSLoopWarn, false,                                         \
1650           "Warn in case of excessive CMS looping")                          \
1651                                                                             \
1652   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1653           "Whether preserved marks should be restored early")               \
1654                                                                             \
1655   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1656           "Size of marking stack")                                          \
1657                                                                             \
1658   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1659           "Max size of marking stack")                                      \
1660                                                                             \
1661   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1662           "Whether we should simulate frequent marking stack / work queue"  \
1663           " overflow")                                                      \
1664                                                                             \
1665   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1666           "An `interval' counter that determines how frequently"            \
1667           " we simulate overflow; a smaller number increases frequency")    \
1668                                                                             \
1669   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1670           "(Temporary, subject to experimentation)"                         \
1671           "Maximum number of abortable preclean iterations, if > 0")        \
1672                                                                             \
1673   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1674           "(Temporary, subject to experimentation)"                         \
1675           "Maximum time in abortable preclean in ms")                       \
1676                                                                             \
1677   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1678           "(Temporary, subject to experimentation)"                         \
1679           "Nominal minimum work per abortable preclean iteration")          \
1680                                                                             \
1681   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1682           "(Temporary, subject to experimentation)"                         \
1683           " Time that we sleep between iterations when not given"           \
1684           " enough work per iteration")                                     \
1685                                                                             \
1686   product(uintx, CMSRescanMultiple, 32,                                     \
1687           "Size (in cards) of CMS parallel rescan task")                    \
1688                                                                             \
1689   product(uintx, CMSConcMarkMultiple, 32,                                   \
1690           "Size (in cards) of CMS concurrent MT marking task")              \
1691                                                                             \
1692   product(bool, CMSAbortSemantics, false,                                   \
1693           "Whether abort-on-overflow semantics is implemented")             \
1694                                                                             \
1695   product(bool, CMSParallelRemarkEnabled, true,                             \
1696           "Whether parallel remark enabled (only if ParNewGC)")             \
1697                                                                             \
1698   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1699           "Whether parallel remark of survivor space"                       \
1700           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1701                                                                             \
1702   product(bool, CMSPLABRecordAlways, true,                                  \
1703           "Whether to always record survivor space PLAB bdries"             \
1704           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1705                                                                             \
1706   product(bool, CMSConcurrentMTEnabled, true,                               \
1707           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1708                                                                             \
1709   product(bool, CMSPrecleaningEnabled, true,                                \
1710           "Whether concurrent precleaning enabled")                         \
1711                                                                             \
1712   product(uintx, CMSPrecleanIter, 3,                                        \
1713           "Maximum number of precleaning iteration passes")                 \
1714                                                                             \
1715   product(uintx, CMSPrecleanNumerator, 2,                                   \
1716           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1717           " ratio")                                                         \
1718                                                                             \
1719   product(uintx, CMSPrecleanDenominator, 3,                                 \
1720           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1721           " ratio")                                                         \
1722                                                                             \
1723   product(bool, CMSPrecleanRefLists1, true,                                 \
1724           "Preclean ref lists during (initial) preclean phase")             \
1725                                                                             \
1726   product(bool, CMSPrecleanRefLists2, false,                                \
1727           "Preclean ref lists during abortable preclean phase")             \
1728                                                                             \
1729   product(bool, CMSPrecleanSurvivors1, false,                               \
1730           "Preclean survivors during (initial) preclean phase")             \
1731                                                                             \
1732   product(bool, CMSPrecleanSurvivors2, true,                                \
1733           "Preclean survivors during abortable preclean phase")             \
1734                                                                             \
1735   product(uintx, CMSPrecleanThreshold, 1000,                                \
1736           "Don't re-iterate if #dirty cards less than this")                \
1737                                                                             \
1738   product(bool, CMSCleanOnEnter, true,                                      \
1739           "Clean-on-enter optimization for reducing number of dirty cards") \
1740                                                                             \
1741   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1742           "Choose variant (1,2) of verification following remark")          \
1743                                                                             \
1744   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1745           "If Eden used is below this value, don't try to schedule remark") \
1746                                                                             \
1747   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1748           "The Eden occupancy % at which to try and schedule remark pause") \
1749                                                                             \
1750   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1751           "Start sampling Eden top at least before yg occupancy reaches"    \
1752           " 1/<ratio> of the size at which we plan to schedule remark")     \
1753                                                                             \
1754   product(uintx, CMSSamplingGrain, 16*K,                                    \
1755           "The minimum distance between eden samples for CMS (see above)")  \
1756                                                                             \
1757   product(bool, CMSScavengeBeforeRemark, false,                             \
1758           "Attempt scavenge before the CMS remark step")                    \
1759                                                                             \
1760   develop(bool, CMSTraceSweeper, false,                                     \
1761           "Trace some actions of the CMS sweeper")                          \
1762                                                                             \
1763   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1764           "Don't drain below this size per parallel worker/thief")          \
1765                                                                             \
1766   manageable(intx, CMSWaitDuration, 2000,                                   \
1767           "Time in milliseconds that CMS thread waits for young GC")        \
1768                                                                             \
1769   develop(uintx, CMSCheckInterval, 1000,                                    \
1770           "Interval in milliseconds that CMS thread checks if it "          \
1771           "should start a collection cycle")                                \
1772                                                                             \
1773   product(bool, CMSYield, true,                                             \
1774           "Yield between steps of concurrent mark & sweep")                 \
1775                                                                             \
1776   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1777           "Bitmap operations should process at most this many bits"         \
1778           "between yields")                                                 \
1779                                                                             \
1780   product(bool, CMSDumpAtPromotionFailure, false,                           \
1781           "Dump useful information about the state of the CMS old "         \
1782           " generation upon a promotion failure.")                          \
1783                                                                             \
1784   product(bool, CMSPrintChunksInDump, false,                                \
1785           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1786           " more detailed information about the free chunks.")              \
1787                                                                             \
1788   product(bool, CMSPrintObjectsInDump, false,                               \
1789           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1790           " more detailed information about the allocated objects.")        \
1791                                                                             \
1792   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1793           "Verify that all refs across the FLS boundary "                   \
1794           " are to valid objects")                                          \
1795                                                                             \
1796   diagnostic(bool, FLSVerifyLists, false,                                   \
1797           "Do lots of (expensive) FreeListSpace verification")              \
1798                                                                             \
1799   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1800           "Do lots of (expensive) FLS index table verification")            \
1801                                                                             \
1802   develop(bool, FLSVerifyDictionary, false,                                 \
1803           "Do lots of (expensive) FLS dictionary verification")             \
1804                                                                             \
1805   develop(bool, VerifyBlockOffsetArray, false,                              \
1806           "Do (expensive!) block offset array verification")                \
1807                                                                             \
1808   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1809           "Maintain _unallocated_block in BlockOffsetArray"                 \
1810           " (currently applicable only to CMS collector)")                  \
1811                                                                             \
1812   develop(bool, TraceCMSState, false,                                       \
1813           "Trace the state of the CMS collection")                          \
1814                                                                             \
1815   product(intx, RefDiscoveryPolicy, 0,                                      \
1816           "Whether reference-based(0) or referent-based(1)")                \
1817                                                                             \
1818   product(bool, ParallelRefProcEnabled, false,                              \
1819           "Enable parallel reference processing whenever possible")         \
1820                                                                             \
1821   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1822           "Enable balancing of reference processing queues")                \
1823                                                                             \
1824   product(uintx, CMSTriggerRatio, 80,                                       \
1825           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1826           "allocated before a CMS collection cycle commences")              \
1827                                                                             \
1828   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1829           "Percentage CMS generation occupancy at which to "                \
1830           "initiate CMS collection for bootstrapping collection stats")     \
1831                                                                             \
1832   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1833           "Percentage CMS generation occupancy to start a CMS collection "  \
1834           "cycle. A negative value means that CMSTriggerRatio is used")     \
1835                                                                             \
1836   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1837           "Percentage of the (entire) heap occupancy to start a "           \
1838           "concurrent GC cycle. It is used by GCs that trigger a "          \
1839           "concurrent GC cycle based on the occupancy of the entire heap, " \
1840           "not just one of the generations (e.g., G1). A value of 0 "       \
1841           "denotes 'do constant GC cycles'.")                               \
1842                                                                             \
1843   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1844           "Only use occupancy as a crierion for starting a CMS collection") \
1845                                                                             \
1846   product(intx, CMSIsTooFullPercentage, 98,                                 \
1847           "An absolute ceiling above which CMS will always consider the "   \
1848           "unloading of classes when class unloading is enabled")           \
1849                                                                             \
1850   develop(bool, CMSTestInFreeList, false,                                   \
1851           "Check if the coalesced range is already in the "                 \
1852           "free lists as claimed")                                          \
1853                                                                             \
1854   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1855           "Check that all the garbage collected was returned to the "       \
1856           "free lists.")                                                    \
1857                                                                             \
1858   notproduct(bool, ScavengeALot, false,                                     \
1859           "Force scavenge at every Nth exit from the runtime system "       \
1860           "(N=ScavengeALotInterval)")                                       \
1861                                                                             \
1862   develop(bool, FullGCALot, false,                                          \
1863           "Force full gc at every Nth exit from the runtime system "        \
1864           "(N=FullGCALotInterval)")                                         \
1865                                                                             \
1866   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1867           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1868                                                                             \
1869   product(bool, PrintPromotionFailure, false,                               \
1870           "Print additional diagnostic information following "              \
1871           " promotion failure")                                             \
1872                                                                             \
1873   notproduct(bool, PromotionFailureALot, false,                             \
1874           "Use promotion failure handling on every youngest generation "    \
1875           "collection")                                                     \
1876                                                                             \
1877   develop(uintx, PromotionFailureALotCount, 1000,                           \
1878           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1879           "refill attempts (ParNew) or promotion attempts "                 \
1880           "(other young collectors) ")                                      \
1881                                                                             \
1882   develop(uintx, PromotionFailureALotInterval, 5,                           \
1883           "Total collections between promotion failures alot")              \
1884                                                                             \
1885   experimental(intx, WorkStealingSleepMillis, 1,                            \
1886           "Sleep time when sleep is used for yields")                       \
1887                                                                             \
1888   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1889           "Number of yields before a sleep is done during workstealing")    \
1890                                                                             \
1891   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1892           "Number of iterations in a spin loop between checks on "          \
1893           "time out of hard spin")                                          \
1894                                                                             \
1895   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1896           "Ratio of hard spins to calls to yield")                          \
1897                                                                             \
1898   develop(uintx, ObjArrayMarkingStride, 512,                                \
1899           "Number of ObjArray elements to push onto the marking stack"      \
1900           "before pushing a continuation entry")                            \
1901                                                                             \
1902   develop(bool, MetadataAllocationFailALot, false,                          \
1903           "Fail metadata allocations at intervals controlled by "           \
1904           "MetadataAllocationFailALotInterval")                             \
1905                                                                             \
1906   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1907           "metadata allocation failure alot interval")                      \
1908                                                                             \
1909   develop(bool, MetaDataDeallocateALot, false,                              \
1910           "Deallocation bunches of metadata at intervals controlled by "    \
1911           "MetaDataAllocateALotInterval")                                   \
1912                                                                             \
1913   develop(uintx, MetaDataDeallocateALotInterval, 100,                       \
1914           "Metadata deallocation alot interval")                            \
1915                                                                             \
1916   develop(bool, TraceMetadataChunkAllocation, false,                        \
1917           "Trace chunk metadata allocations")                               \
1918                                                                             \
1919   product(bool, TraceMetadataHumongousAllocation, false,                    \
1920           "Trace humongous metadata allocations")                           \
1921                                                                             \
1922   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1923           "Trace virtual space metadata allocations")                       \
1924                                                                             \
1925   notproduct(bool, ExecuteInternalVMTests, false,                           \
1926           "Enable execution of internal VM tests.")                         \
1927                                                                             \
1928   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1929                                                                             \
1930   product_pd(bool, ResizeTLAB,                                              \
1931           "Dynamically resize tlab size for threads")                       \
1932                                                                             \
1933   product(bool, ZeroTLAB, false,                                            \
1934           "Zero out the newly created TLAB")                                \
1935                                                                             \
1936   product(bool, FastTLABRefill, true,                                       \
1937           "Use fast TLAB refill code")                                      \
1938                                                                             \
1939   product(bool, PrintTLAB, false,                                           \
1940           "Print various TLAB related information")                         \
1941                                                                             \
1942   product(bool, TLABStats, true,                                            \
1943           "Print various TLAB related information")                         \
1944                                                                             \
1945   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
1946           "Enable LowMemoryProtection"))                                    \
1947                                                                             \
1948   product_pd(bool, NeverActAsServerClassMachine,                            \
1949           "Never act like a server-class machine")                          \
1950                                                                             \
1951   product(bool, AlwaysActAsServerClassMachine, false,                       \
1952           "Always act like a server-class machine")                         \
1953                                                                             \
1954   product_pd(uint64_t, MaxRAM,                                              \
1955           "Real memory size (in bytes) used to set maximum heap size")      \
1956                                                                             \
1957   product(uintx, ErgoHeapSizeLimit, 0,                                      \
1958           "Maximum ergonomically set heap size (in bytes); zero means use " \
1959           "MaxRAM / MaxRAMFraction")                                        \
1960                                                                             \
1961   product(uintx, MaxRAMFraction, 4,                                         \
1962           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1963           "size")                                                           \
1964                                                                             \
1965   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1966           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1967           "size; deprecated: to be renamed to MaxRAMFraction")              \
1968                                                                             \
1969   product(uintx, MinRAMFraction, 2,                                         \
1970           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
1971           "size on systems with small physical memory size")                \
1972                                                                             \
1973   product(uintx, InitialRAMFraction, 64,                                    \
1974           "Fraction (1/n) of real memory used for initial heap size")       \
1975                                                                             \
1976   develop(uintx, MaxVirtMemFraction, 2,                                     \
1977           "Maximum fraction (1/n) of virtual memory used for ergonomically" \
1978           "determining maximum heap size")                                  \
1979                                                                             \
1980   product(bool, UseAutoGCSelectPolicy, false,                               \
1981           "Use automatic collection selection policy")                      \
1982                                                                             \
1983   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1984           "Automatic GC selection pause threshhold in ms")                  \
1985                                                                             \
1986   product(bool, UseAdaptiveSizePolicy, true,                                \
1987           "Use adaptive generation sizing policies")                        \
1988                                                                             \
1989   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1990           "Use adaptive survivor sizing policies")                          \
1991                                                                             \
1992   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1993           "Use adaptive young-old sizing policies at minor collections")    \
1994                                                                             \
1995   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1996           "Use adaptive young-old sizing policies at major collections")    \
1997                                                                             \
1998   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1999           "Use statistics from System.GC for adaptive size policy")         \
2000                                                                             \
2001   product(bool, UseAdaptiveGCBoundary, false,                               \
2002           "Allow young-old boundary to move")                               \
2003                                                                             \
2004   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2005           "Trace young-old boundary moves")                                 \
2006                                                                             \
2007   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2008           "Resize the virtual spaces of the young or old generations")      \
2009                                                                             \
2010   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2011           "Policy for changeing generation size for throughput goals")      \
2012                                                                             \
2013   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2014           "Policy for changing generation size for pause goals")            \
2015                                                                             \
2016   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2017           "Adjust tenured generation to achive a minor pause goal")         \
2018                                                                             \
2019   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2020           "Adjust young generation to achive a major pause goal")           \
2021                                                                             \
2022   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2023           "Number of steps where heuristics is used before data is used")   \
2024                                                                             \
2025   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2026           "Number of collections before the adaptive sizing is started")    \
2027                                                                             \
2028   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2029           "Collecton interval for printing information; zero => never")     \
2030                                                                             \
2031   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2032           "Use adaptive minimum footprint as a goal")                       \
2033                                                                             \
2034   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2035           "Weight given to exponential resizing, between 0 and 100")        \
2036                                                                             \
2037   product(uintx, AdaptiveTimeWeight,       25,                              \
2038           "Weight given to time in adaptive policy, between 0 and 100")     \
2039                                                                             \
2040   product(uintx, PausePadding, 1,                                           \
2041           "How much buffer to keep for pause time")                         \
2042                                                                             \
2043   product(uintx, PromotedPadding, 3,                                        \
2044           "How much buffer to keep for promotion failure")                  \
2045                                                                             \
2046   product(uintx, SurvivorPadding, 3,                                        \
2047           "How much buffer to keep for survivor overflow")                  \
2048                                                                             \
2049   product(uintx, ThresholdTolerance, 10,                                    \
2050           "Allowed collection cost difference between generations")         \
2051                                                                             \
2052   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2053           "If collection costs are within margin, reduce both by full "     \
2054           "delta")                                                          \
2055                                                                             \
2056   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2057           "Adaptive size percentage change in young generation")            \
2058                                                                             \
2059   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2060           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2061                                                                             \
2062   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2063           "Decay factor to YoungedGenerationSizeSupplement")                \
2064                                                                             \
2065   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2066           "Adaptive size percentage change in tenured generation")          \
2067                                                                             \
2068   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2069           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2070                                                                             \
2071   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2072           "Decay factor to TenuredGenerationSizeIncrement")                 \
2073                                                                             \
2074   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2075           "Adaptive size policy maximum GC pause time goal in msec, "       \
2076           "or (G1 Only) the max. GC time per MMU time slice")               \
2077                                                                             \
2078   product(uintx, GCPauseIntervalMillis, 0,                                  \
2079           "Time slice for MMU specification")                               \
2080                                                                             \
2081   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2082           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2083                                                                             \
2084   product(uintx, GCTimeRatio, 99,                                           \
2085           "Adaptive size policy application time to GC time ratio")         \
2086                                                                             \
2087   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2088           "Adaptive size scale down factor for shrinking")                  \
2089                                                                             \
2090   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2091           "Adaptive size decays the major cost for long major intervals")   \
2092                                                                             \
2093   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2094           "Time scale over which major costs decay")                        \
2095                                                                             \
2096   product(uintx, MinSurvivorRatio, 3,                                       \
2097           "Minimum ratio of young generation/survivor space size")          \
2098                                                                             \
2099   product(uintx, InitialSurvivorRatio, 8,                                   \
2100           "Initial ratio of eden/survivor space size")                      \
2101                                                                             \
2102   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2103           "Estimate of footprint other than Java Heap")                     \
2104                                                                             \
2105   product(bool, UseGCOverheadLimit, true,                                   \
2106           "Use policy to limit of proportion of time spent in GC "          \
2107           "before an OutOfMemory error is thrown")                          \
2108                                                                             \
2109   product(uintx, GCTimeLimit, 98,                                           \
2110           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2111           "error is thrown (used with GCHeapFreeLimit)")                    \
2112                                                                             \
2113   product(uintx, GCHeapFreeLimit, 2,                                        \
2114           "Minimum percentage of free space after a full GC before an "     \
2115           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2116                                                                             \
2117   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2118           "Number of consecutive collections before gc time limit fires")   \
2119                                                                             \
2120   product(bool, PrintAdaptiveSizePolicy, false,                             \
2121           "Print information about AdaptiveSizePolicy")                     \
2122                                                                             \
2123   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2124           "How far ahead to prefetch destination area (<= 0 means off)")    \
2125                                                                             \
2126   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2127           "How far ahead to prefetch scan area (<= 0 means off)")           \
2128                                                                             \
2129   product(intx, PrefetchFieldsAhead, -1,                                    \
2130           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2131                                                                             \
2132   diagnostic(bool, VerifySilently, false,                                   \
2133           "Don't print print the verification progress")                    \
2134                                                                             \
2135   diagnostic(bool, VerifyDuringStartup, false,                              \
2136           "Verify memory system before executing any Java code "            \
2137           "during VM initialization")                                       \
2138                                                                             \
2139   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2140           "Verify system before exiting")                                   \
2141                                                                             \
2142   diagnostic(bool, VerifyBeforeGC, false,                                   \
2143           "Verify memory system before GC")                                 \
2144                                                                             \
2145   diagnostic(bool, VerifyAfterGC, false,                                    \
2146           "Verify memory system after GC")                                  \
2147                                                                             \
2148   diagnostic(bool, VerifyDuringGC, false,                                   \
2149           "Verify memory system during GC (between phases)")                \
2150                                                                             \
2151   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2152           "Enable parallel memory system verification")                     \
2153                                                                             \
2154   diagnostic(bool, DeferInitialCardMark, false,                             \
2155           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2156            "may arise from new_pre_store_barrier")                          \
2157                                                                             \
2158   diagnostic(bool, VerifyRememberedSets, false,                             \
2159           "Verify GC remembered sets")                                      \
2160                                                                             \
2161   diagnostic(bool, VerifyObjectStartArray, true,                            \
2162           "Verify GC object start array if verify before/after")            \
2163                                                                             \
2164   product(bool, DisableExplicitGC, false,                                   \
2165           "Tells whether calling System.gc() does a full GC")               \
2166                                                                             \
2167   notproduct(bool, CheckMemoryInitialization, false,                        \
2168           "Checks memory initialization")                                   \
2169                                                                             \
2170   product(bool, CollectGen0First, false,                                    \
2171           "Collect youngest generation before each full GC")                \
2172                                                                             \
2173   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2174           "Bind CMS Thread to CPU if possible")                             \
2175                                                                             \
2176   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2177           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2178                                                                             \
2179   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2180           "Bind GCTaskThreads to CPUs if possible")                         \
2181                                                                             \
2182   product(bool, UseGCTaskAffinity, false,                                   \
2183           "Use worker affinity when asking for GCTasks")                    \
2184                                                                             \
2185   product(uintx, ProcessDistributionStride, 4,                              \
2186           "Stride through processors when distributing processes")          \
2187                                                                             \
2188   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2189           "number of times the coordinator GC thread will sleep while "     \
2190           "yielding before giving up and resuming GC")                      \
2191                                                                             \
2192   product(uintx, CMSYieldSleepCount, 0,                                     \
2193           "number of times a GC thread (minus the coordinator) "            \
2194           "will sleep while yielding before giving up and resuming GC")     \
2195                                                                             \
2196   /* gc tracing */                                                          \
2197   manageable(bool, PrintGC, false,                                          \
2198           "Print message at garbage collect")                               \
2199                                                                             \
2200   manageable(bool, PrintGCDetails, false,                                   \
2201           "Print more details at garbage collect")                          \
2202                                                                             \
2203   manageable(bool, PrintGCDateStamps, false,                                \
2204           "Print date stamps at garbage collect")                           \
2205                                                                             \
2206   manageable(bool, PrintGCTimeStamps, false,                                \
2207           "Print timestamps at garbage collect")                            \
2208                                                                             \
2209   product(bool, PrintGCTaskTimeStamps, false,                               \
2210           "Print timestamps for individual gc worker thread tasks")         \
2211                                                                             \
2212   develop(intx, ConcGCYieldTimeout, 0,                                      \
2213           "If non-zero, assert that GC threads yield within this # of ms.") \
2214                                                                             \
2215   notproduct(bool, TraceMarkSweep, false,                                   \
2216           "Trace mark sweep")                                               \
2217                                                                             \
2218   product(bool, PrintReferenceGC, false,                                    \
2219           "Print times spent handling reference objects during GC "         \
2220           " (enabled only when PrintGCDetails)")                            \
2221                                                                             \
2222   develop(bool, TraceReferenceGC, false,                                    \
2223           "Trace handling of soft/weak/final/phantom references")           \
2224                                                                             \
2225   develop(bool, TraceFinalizerRegistration, false,                          \
2226          "Trace registration of final references")                          \
2227                                                                             \
2228   notproduct(bool, TraceScavenge, false,                                    \
2229           "Trace scavenge")                                                 \
2230                                                                             \
2231   product_rw(bool, TraceClassLoading, false,                                \
2232           "Trace all classes loaded")                                       \
2233                                                                             \
2234   product(bool, TraceClassLoadingPreorder, false,                           \
2235           "Trace all classes loaded in order referenced (not loaded)")      \
2236                                                                             \
2237   product_rw(bool, TraceClassUnloading, false,                              \
2238           "Trace unloading of classes")                                     \
2239                                                                             \
2240   product_rw(bool, TraceLoaderConstraints, false,                           \
2241           "Trace loader constraints")                                       \
2242                                                                             \
2243   develop(bool, TraceClassLoaderData, false,                                \
2244           "Trace class loader loader_data lifetime")                        \
2245                                                                             \
2246   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2247           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2248           "Initial size of the boot class loader data metaspace")           \
2249                                                                             \
2250   product(bool, TraceGen0Time, false,                                       \
2251           "Trace accumulated time for Gen 0 collection")                    \
2252                                                                             \
2253   product(bool, TraceGen1Time, false,                                       \
2254           "Trace accumulated time for Gen 1 collection")                    \
2255                                                                             \
2256   product(bool, PrintTenuringDistribution, false,                           \
2257           "Print tenuring age information")                                 \
2258                                                                             \
2259   product_rw(bool, PrintHeapAtGC, false,                                    \
2260           "Print heap layout before and after each GC")                     \
2261                                                                             \
2262   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2263           "Prints extended information about the layout of the heap "       \
2264           "when -XX:+PrintHeapAtGC is set")                                 \
2265                                                                             \
2266   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2267           "Print heap layout in response to SIGBREAK")                      \
2268                                                                             \
2269   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2270           "Print a class histogram before any major stop-world GC")         \
2271                                                                             \
2272   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2273           "Print a class histogram after any major stop-world GC")          \
2274                                                                             \
2275   manageable(bool, PrintClassHistogram, false,                              \
2276           "Print a histogram of class instances")                           \
2277                                                                             \
2278   develop(bool, TraceWorkGang, false,                                       \
2279           "Trace activities of work gangs")                                 \
2280                                                                             \
2281   product(bool, TraceParallelOldGCTasks, false,                             \
2282           "Trace multithreaded GC activity")                                \
2283                                                                             \
2284   develop(bool, TraceBlockOffsetTable, false,                               \
2285           "Print BlockOffsetTable maps")                                    \
2286                                                                             \
2287   develop(bool, TraceCardTableModRefBS, false,                              \
2288           "Print CardTableModRefBS maps")                                   \
2289                                                                             \
2290   develop(bool, TraceGCTaskManager, false,                                  \
2291           "Trace actions of the GC task manager")                           \
2292                                                                             \
2293   develop(bool, TraceGCTaskQueue, false,                                    \
2294           "Trace actions of the GC task queues")                            \
2295                                                                             \
2296   diagnostic(bool, TraceGCTaskThread, false,                                \
2297           "Trace actions of the GC task threads")                           \
2298                                                                             \
2299   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2300           "Print the time taken by each parallel old gc phase."             \
2301           "PrintGCDetails must also be enabled.")                           \
2302                                                                             \
2303   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2304           "Trace parallel old gc marking phase")                            \
2305                                                                             \
2306   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2307           "Trace parallel old gc summary phase")                            \
2308                                                                             \
2309   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2310           "Trace parallel old gc compaction phase")                         \
2311                                                                             \
2312   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2313           "Trace parallel old gc dense prefix computation")                 \
2314                                                                             \
2315   develop(bool, IgnoreLibthreadGPFault, false,                              \
2316           "Suppress workaround for libthread GP fault")                     \
2317                                                                             \
2318   product(bool, PrintJNIGCStalls, false,                                    \
2319           "Print diagnostic message when GC is stalled"                     \
2320           "by JNI critical section")                                        \
2321                                                                             \
2322   /* GC log rotation setting */                                             \
2323                                                                             \
2324   product(bool, UseGCLogFileRotation, false,                                \
2325           "Prevent large gclog file for long running app. "                 \
2326           "Requires -Xloggc:<filename>")                                    \
2327                                                                             \
2328   product(uintx, NumberOfGCLogFiles, 0,                                     \
2329           "Number of gclog files in rotation, "                             \
2330           "Default: 0, no rotation")                                        \
2331                                                                             \
2332   product(uintx, GCLogFileSize, 0,                                          \
2333           "GC log file size, Default: 0 bytes, no rotation "                \
2334           "Only valid with UseGCLogFileRotation")                           \
2335                                                                             \
2336   /* JVMTI heap profiling */                                                \
2337                                                                             \
2338   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2339           "Trace JVMTI object tagging calls")                               \
2340                                                                             \
2341   diagnostic(bool, VerifyBeforeIteration, false,                            \
2342           "Verify memory system before JVMTI iteration")                    \
2343                                                                             \
2344   /* compiler interface */                                                  \
2345                                                                             \
2346   develop(bool, CIPrintCompilerName, false,                                 \
2347           "when CIPrint is active, print the name of the active compiler")  \
2348                                                                             \
2349   develop(bool, CIPrintCompileQueue, false,                                 \
2350           "display the contents of the compile queue whenever a "           \
2351           "compilation is enqueued")                                        \
2352                                                                             \
2353   develop(bool, CIPrintRequests, false,                                     \
2354           "display every request for compilation")                          \
2355                                                                             \
2356   product(bool, CITime, false,                                              \
2357           "collect timing information for compilation")                     \
2358                                                                             \
2359   develop(bool, CITimeEach, false,                                          \
2360           "display timing information after each successful compilation")   \
2361                                                                             \
2362   develop(bool, CICountOSR, false,                                          \
2363           "use a separate counter when assigning ids to osr compilations")  \
2364                                                                             \
2365   develop(bool, CICompileNatives, true,                                     \
2366           "compile native methods if supported by the compiler")            \
2367                                                                             \
2368   develop_pd(bool, CICompileOSR,                                            \
2369           "compile on stack replacement methods if supported by the "       \
2370           "compiler")                                                       \
2371                                                                             \
2372   develop(bool, CIPrintMethodCodes, false,                                  \
2373           "print method bytecodes of the compiled code")                    \
2374                                                                             \
2375   develop(bool, CIPrintTypeFlow, false,                                     \
2376           "print the results of ciTypeFlow analysis")                       \
2377                                                                             \
2378   develop(bool, CITraceTypeFlow, false,                                     \
2379           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2380                                                                             \
2381   develop(intx, OSROnlyBCI, -1,                                             \
2382           "OSR only at this bci.  Negative values mean exclude that bci")   \
2383                                                                             \
2384   /* compiler */                                                            \
2385                                                                             \
2386   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2387           "Number of compiler threads to run")                              \
2388                                                                             \
2389   product(intx, CompilationPolicyChoice, 0,                                 \
2390           "which compilation policy (0/1)")                                 \
2391                                                                             \
2392   develop(bool, UseStackBanging, true,                                      \
2393           "use stack banging for stack overflow checks (required for "      \
2394           "proper StackOverflow handling; disable only to measure cost "    \
2395           "of stackbanging)")                                               \
2396                                                                             \
2397   develop(bool, UseStrictFP, true,                                          \
2398           "use strict fp if modifier strictfp is set")                      \
2399                                                                             \
2400   develop(bool, GenerateSynchronizationCode, true,                          \
2401           "generate locking/unlocking code for synchronized methods and "   \
2402           "monitors")                                                       \
2403                                                                             \
2404   develop(bool, GenerateCompilerNullChecks, true,                           \
2405           "Generate explicit null checks for loads/stores/calls")           \
2406                                                                             \
2407   develop(bool, GenerateRangeChecks, true,                                  \
2408           "Generate range checks for array accesses")                       \
2409                                                                             \
2410   develop_pd(bool, ImplicitNullChecks,                                      \
2411           "generate code for implicit null checks")                         \
2412                                                                             \
2413   product(bool, PrintSafepointStatistics, false,                            \
2414           "print statistics about safepoint synchronization")               \
2415                                                                             \
2416   product(intx, PrintSafepointStatisticsCount, 300,                         \
2417           "total number of safepoint statistics collected "                 \
2418           "before printing them out")                                       \
2419                                                                             \
2420   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2421           "print safepoint statistics only when safepoint takes"            \
2422           " more than PrintSafepointSatisticsTimeout in millis")            \
2423                                                                             \
2424   product(bool, TraceSafepointCleanupTime, false,                           \
2425           "print the break down of clean up tasks performed during"         \
2426           " safepoint")                                                     \
2427                                                                             \
2428   product(bool, Inline, true,                                               \
2429           "enable inlining")                                                \
2430                                                                             \
2431   product(bool, ClipInlining, true,                                         \
2432           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2433                                                                             \
2434   develop(bool, UseCHA, true,                                               \
2435           "enable CHA")                                                     \
2436                                                                             \
2437   product(bool, UseTypeProfile, true,                                       \
2438           "Check interpreter profile for historically monomorphic calls")   \
2439                                                                             \
2440   notproduct(bool, TimeCompiler, false,                                     \
2441           "time the compiler")                                              \
2442                                                                             \
2443   diagnostic(bool, PrintInlining, false,                                    \
2444           "prints inlining optimizations")                                  \
2445                                                                             \
2446   product(bool, UsePopCountInstruction, false,                              \
2447           "Use population count instruction")                               \
2448                                                                             \
2449   develop(bool, EagerInitialization, false,                                 \
2450           "Eagerly initialize classes if possible")                         \
2451                                                                             \
2452   develop(bool, TraceMethodReplacement, false,                              \
2453           "Print when methods are replaced do to recompilation")            \
2454                                                                             \
2455   develop(bool, PrintMethodFlushing, false,                                 \
2456           "print the nmethods being flushed")                               \
2457                                                                             \
2458   develop(bool, UseRelocIndex, false,                                       \
2459          "use an index to speed random access to relocations")              \
2460                                                                             \
2461   develop(bool, StressCodeBuffers, false,                                   \
2462          "Exercise code buffer expansion and other rare state changes")     \
2463                                                                             \
2464   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2465          "Generate extra debugging info for non-safepoints in nmethods")    \
2466                                                                             \
2467   product(bool, PrintVMOptions, false,                                      \
2468          "Print flags that appeared on the command line")                   \
2469                                                                             \
2470   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2471          "Ignore unrecognized VM options")                                  \
2472                                                                             \
2473   product(bool, PrintCommandLineFlags, false,                               \
2474          "Print flags specified on command line or set by ergonomics")      \
2475                                                                             \
2476   product(bool, PrintFlagsInitial, false,                                   \
2477          "Print all VM flags before argument processing and exit VM")       \
2478                                                                             \
2479   product(bool, PrintFlagsFinal, false,                                     \
2480          "Print all VM flags after argument and ergonomic processing")      \
2481                                                                             \
2482   notproduct(bool, PrintFlagsWithComments, false,                           \
2483          "Print all VM flags with default values and descriptions and exit")\
2484                                                                             \
2485   diagnostic(bool, SerializeVMOutput, true,                                 \
2486          "Use a mutex to serialize output to tty and hotspot.log")          \
2487                                                                             \
2488   diagnostic(bool, DisplayVMOutput, true,                                   \
2489          "Display all VM output on the tty, independently of LogVMOutput")  \
2490                                                                             \
2491   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2492          "Save VM output to hotspot.log, or to LogFile")                    \
2493                                                                             \
2494   diagnostic(ccstr, LogFile, NULL,                                          \
2495          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2496                                                                             \
2497   product(ccstr, ErrorFile, NULL,                                           \
2498          "If an error occurs, save the error data to this file "            \
2499          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2500                                                                             \
2501   product(bool, DisplayVMOutputToStderr, false,                             \
2502          "If DisplayVMOutput is true, display all VM output to stderr")     \
2503                                                                             \
2504   product(bool, DisplayVMOutputToStdout, false,                             \
2505          "If DisplayVMOutput is true, display all VM output to stdout")     \
2506                                                                             \
2507   product(bool, UseHeavyMonitors, false,                                    \
2508           "use heavyweight instead of lightweight Java monitors")           \
2509                                                                             \
2510   product(bool, PrintStringTableStatistics, false,                          \
2511           "print statistics about the StringTable and SymbolTable")         \
2512                                                                             \
2513   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2514           "print histogram of the symbol table")                            \
2515                                                                             \
2516   notproduct(bool, ExitVMOnVerifyError, false,                              \
2517           "standard exit from VM if bytecode verify error "                 \
2518           "(only in debug mode)")                                           \
2519                                                                             \
2520   notproduct(ccstr, AbortVMOnException, NULL,                               \
2521           "Call fatal if this exception is thrown.  Example: "              \
2522           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2523                                                                             \
2524   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2525           "Call fatal if the exception pointed by AbortVMOnException "      \
2526           "has this message.")                                              \
2527                                                                             \
2528   develop(bool, DebugVtables, false,                                        \
2529           "add debugging code to vtable dispatch")                          \
2530                                                                             \
2531   develop(bool, PrintVtables, false,                                        \
2532           "print vtables when printing klass")                              \
2533                                                                             \
2534   notproduct(bool, PrintVtableStats, false,                                 \
2535           "print vtables stats at end of run")                              \
2536                                                                             \
2537   develop(bool, TraceCreateZombies, false,                                  \
2538           "trace creation of zombie nmethods")                              \
2539                                                                             \
2540   notproduct(bool, IgnoreLockingAssertions, false,                          \
2541           "disable locking assertions (for speed)")                         \
2542                                                                             \
2543   product(bool, RangeCheckElimination, true,                                \
2544           "Eliminate range checks")                                         \
2545                                                                             \
2546   develop_pd(bool, UncommonNullCast,                                        \
2547           "track occurrences of null in casts; adjust compiler tactics")    \
2548                                                                             \
2549   develop(bool, TypeProfileCasts,  true,                                    \
2550           "treat casts like calls for purposes of type profiling")          \
2551                                                                             \
2552   develop(bool, DelayCompilationDuringStartup, true,                        \
2553           "Delay invoking the compiler until main application class is "    \
2554           "loaded")                                                         \
2555                                                                             \
2556   develop(bool, CompileTheWorld, false,                                     \
2557           "Compile all methods in all classes in bootstrap class path "     \
2558           "(stress test)")                                                  \
2559                                                                             \
2560   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2561           "Preload all classes used by a class before start loading")       \
2562                                                                             \
2563   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2564           "Force a safepoint every n compiles so sweeper can keep up")      \
2565                                                                             \
2566   develop(bool, FillDelaySlots, true,                                       \
2567           "Fill delay slots (on SPARC only)")                               \
2568                                                                             \
2569   develop(bool, TimeLivenessAnalysis, false,                                \
2570           "Time computation of bytecode liveness analysis")                 \
2571                                                                             \
2572   develop(bool, TraceLivenessGen, false,                                    \
2573           "Trace the generation of liveness analysis information")          \
2574                                                                             \
2575   notproduct(bool, TraceLivenessQuery, false,                               \
2576           "Trace queries of liveness analysis information")                 \
2577                                                                             \
2578   notproduct(bool, CollectIndexSetStatistics, false,                        \
2579           "Collect information about IndexSets")                            \
2580                                                                             \
2581   develop(bool, UseLoopSafepoints, true,                                    \
2582           "Generate Safepoint nodes in every loop")                         \
2583                                                                             \
2584   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2585           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2586           "Inline allocations larger than this in doublewords must go slow")\
2587                                                                             \
2588   product(bool, AggressiveOpts, false,                                      \
2589           "Enable aggressive optimizations - see arguments.cpp")            \
2590                                                                             \
2591   product(bool, UseStringCache, false,                                      \
2592           "Enable String cache capabilities on String.java")                \
2593                                                                             \
2594   /* statistics */                                                          \
2595   develop(bool, CountCompiledCalls, false,                                  \
2596           "counts method invocations")                                      \
2597                                                                             \
2598   notproduct(bool, CountRuntimeCalls, false,                                \
2599           "counts VM runtime calls")                                        \
2600                                                                             \
2601   develop(bool, CountJNICalls, false,                                       \
2602           "counts jni method invocations")                                  \
2603                                                                             \
2604   notproduct(bool, CountJVMCalls, false,                                    \
2605           "counts jvm method invocations")                                  \
2606                                                                             \
2607   notproduct(bool, CountRemovableExceptions, false,                         \
2608           "count exceptions that could be replaced by branches due to "     \
2609           "inlining")                                                       \
2610                                                                             \
2611   notproduct(bool, ICMissHistogram, false,                                  \
2612           "produce histogram of IC misses")                                 \
2613                                                                             \
2614   notproduct(bool, PrintClassStatistics, false,                             \
2615           "prints class statistics at end of run")                          \
2616                                                                             \
2617   notproduct(bool, PrintMethodStatistics, false,                            \
2618           "prints method statistics at end of run")                         \
2619                                                                             \
2620   /* interpreter */                                                         \
2621   develop(bool, ClearInterpreterLocals, false,                              \
2622           "Always clear local variables of interpreter activations upon "   \
2623           "entry")                                                          \
2624                                                                             \
2625   product_pd(bool, RewriteBytecodes,                                        \
2626           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2627                                                                             \
2628   product_pd(bool, RewriteFrequentPairs,                                    \
2629           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2630                                                                             \
2631   diagnostic(bool, PrintInterpreter, false,                                 \
2632           "Prints the generated interpreter code")                          \
2633                                                                             \
2634   product(bool, UseInterpreter, true,                                       \
2635           "Use interpreter for non-compiled methods")                       \
2636                                                                             \
2637   develop(bool, UseFastSignatureHandlers, true,                             \
2638           "Use fast signature handlers for native calls")                   \
2639                                                                             \
2640   product(bool, UseLoopCounter, true,                                       \
2641           "Increment invocation counter on backward branch")                \
2642                                                                             \
2643   product(bool, UseFastEmptyMethods, true,                                  \
2644           "Use fast method entry code for empty methods")                   \
2645                                                                             \
2646   product(bool, UseFastAccessorMethods, true,                               \
2647           "Use fast method entry code for accessor methods")                \
2648                                                                             \
2649   product_pd(bool, UseOnStackReplacement,                                   \
2650            "Use on stack replacement, calls runtime if invoc. counter "     \
2651            "overflows in loop")                                             \
2652                                                                             \
2653   notproduct(bool, TraceOnStackReplacement, false,                          \
2654           "Trace on stack replacement")                                     \
2655                                                                             \
2656   product_pd(bool, PreferInterpreterNativeStubs,                            \
2657           "Use always interpreter stubs for native methods invoked via "    \
2658           "interpreter")                                                    \
2659                                                                             \
2660   develop(bool, CountBytecodes, false,                                      \
2661           "Count number of bytecodes executed")                             \
2662                                                                             \
2663   develop(bool, PrintBytecodeHistogram, false,                              \
2664           "Print histogram of the executed bytecodes")                      \
2665                                                                             \
2666   develop(bool, PrintBytecodePairHistogram, false,                          \
2667           "Print histogram of the executed bytecode pairs")                 \
2668                                                                             \
2669   diagnostic(bool, PrintSignatureHandlers, false,                           \
2670           "Print code generated for native method signature handlers")      \
2671                                                                             \
2672   develop(bool, VerifyOops, false,                                          \
2673           "Do plausibility checks for oops")                                \
2674                                                                             \
2675   develop(bool, CheckUnhandledOops, false,                                  \
2676           "Check for unhandled oops in VM code")                            \
2677                                                                             \
2678   develop(bool, VerifyJNIFields, trueInDebug,                               \
2679           "Verify jfieldIDs for instance fields")                           \
2680                                                                             \
2681   notproduct(bool, VerifyJNIEnvThread, false,                               \
2682           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2683           "from JNI")                                                       \
2684                                                                             \
2685   develop(bool, VerifyFPU, false,                                           \
2686           "Verify FPU state (check for NaN's, etc.)")                       \
2687                                                                             \
2688   develop(bool, VerifyThread, false,                                        \
2689           "Watch the thread register for corruption (SPARC only)")          \
2690                                                                             \
2691   develop(bool, VerifyActivationFrameSize, false,                           \
2692           "Verify that activation frame didn't become smaller than its "    \
2693           "minimal size")                                                   \
2694                                                                             \
2695   develop(bool, TraceFrequencyInlining, false,                              \
2696           "Trace frequency based inlining")                                 \
2697                                                                             \
2698   develop_pd(bool, InlineIntrinsics,                                        \
2699            "Inline intrinsics that can be statically resolved")             \
2700                                                                             \
2701   product_pd(bool, ProfileInterpreter,                                      \
2702            "Profile at the bytecode level during interpretation")           \
2703                                                                             \
2704   develop_pd(bool, ProfileTraps,                                            \
2705           "Profile deoptimization traps at the bytecode level")             \
2706                                                                             \
2707   product(intx, ProfileMaturityPercentage, 20,                              \
2708           "number of method invocations/branches (expressed as % of "       \
2709           "CompileThreshold) before using the method's profile")            \
2710                                                                             \
2711   develop(bool, PrintMethodData, false,                                     \
2712            "Print the results of +ProfileInterpreter at end of run")        \
2713                                                                             \
2714   develop(bool, VerifyDataPointer, trueInDebug,                             \
2715           "Verify the method data pointer during interpreter profiling")    \
2716                                                                             \
2717   develop(bool, VerifyCompiledCode, false,                                  \
2718           "Include miscellaneous runtime verifications in nmethod code; "   \
2719           "default off because it disturbs nmethod size heuristics")        \
2720                                                                             \
2721   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2722           "Manually make GC thread crash then dump java stack trace;  "     \
2723           "Test only")                                                      \
2724                                                                             \
2725   /* compilation */                                                         \
2726   product(bool, UseCompiler, true,                                          \
2727           "use compilation")                                                \
2728                                                                             \
2729   develop(bool, TraceCompilationPolicy, false,                              \
2730           "Trace compilation policy")                                       \
2731                                                                             \
2732   develop(bool, TimeCompilationPolicy, false,                               \
2733           "Time the compilation policy")                                    \
2734                                                                             \
2735   product(bool, UseCounterDecay, true,                                      \
2736            "adjust recompilation counters")                                 \
2737                                                                             \
2738   develop(intx, CounterHalfLifeTime,    30,                                 \
2739           "half-life time of invocation counters (in secs)")                \
2740                                                                             \
2741   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2742           "Min. ms. between invocation of CounterDecay")                    \
2743                                                                             \
2744   product(bool, AlwaysCompileLoopMethods, false,                            \
2745           "when using recompilation, never interpret methods "              \
2746           "containing loops")                                               \
2747                                                                             \
2748   product(bool, DontCompileHugeMethods, true,                               \
2749           "don't compile methods > HugeMethodLimit")                        \
2750                                                                             \
2751   /* Bytecode escape analysis estimation. */                                \
2752   product(bool, EstimateArgEscape, true,                                    \
2753           "Analyze bytecodes to estimate escape state of arguments")        \
2754                                                                             \
2755   product(intx, BCEATraceLevel, 0,                                          \
2756           "How much tracing to do of bytecode escape analysis estimates")   \
2757                                                                             \
2758   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2759           "Maximum number of nested calls that are analyzed by BC EA.")     \
2760                                                                             \
2761   product(intx, MaxBCEAEstimateSize, 150,                                   \
2762           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2763                                                                             \
2764   product(intx,  AllocatePrefetchStyle, 1,                                  \
2765           "0 = no prefetch, "                                               \
2766           "1 = prefetch instructions for each allocation, "                 \
2767           "2 = use TLAB watermark to gate allocation prefetch, "            \
2768           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2769                                                                             \
2770   product(intx,  AllocatePrefetchDistance, -1,                              \
2771           "Distance to prefetch ahead of allocation pointer")               \
2772                                                                             \
2773   product(intx,  AllocatePrefetchLines, 3,                                  \
2774           "Number of lines to prefetch ahead of array allocation pointer")  \
2775                                                                             \
2776   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2777           "Number of lines to prefetch ahead of instance allocation pointer") \
2778                                                                             \
2779   product(intx,  AllocatePrefetchStepSize, 16,                              \
2780           "Step size in bytes of sequential prefetch instructions")         \
2781                                                                             \
2782   product(intx,  AllocatePrefetchInstr, 0,                                  \
2783           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2784                                                                             \
2785   /* deoptimization */                                                      \
2786   develop(bool, TraceDeoptimization, false,                                 \
2787           "Trace deoptimization")                                           \
2788                                                                             \
2789   develop(bool, DebugDeoptimization, false,                                 \
2790           "Tracing various information while debugging deoptimization")     \
2791                                                                             \
2792   product(intx, SelfDestructTimer, 0,                                       \
2793           "Will cause VM to terminate after a given time (in minutes) "     \
2794           "(0 means off)")                                                  \
2795                                                                             \
2796   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2797           "Max. no. of lines in the stack trace for Java exceptions "       \
2798           "(0 means all)")                                                  \
2799                                                                             \
2800   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2801           "Guarantee a safepoint (at least) every so many milliseconds "    \
2802           "(0 means none)"))                                                \
2803                                                                             \
2804   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2805           "Guarantee a safepoint (at least) every so many milliseconds "    \
2806           "(0 means none)"))                                                \
2807                                                                             \
2808   product(intx, SafepointTimeoutDelay, 10000,                               \
2809           "Delay in milliseconds for option SafepointTimeout")              \
2810                                                                             \
2811   product(intx, NmethodSweepFraction, 16,                                   \
2812           "Number of invocations of sweeper to cover all nmethods")         \
2813                                                                             \
2814   product(intx, NmethodSweepCheckInterval, 5,                               \
2815           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2816                                                                             \
2817   notproduct(bool, LogSweeper, false,                                       \
2818             "Keep a ring buffer of sweeper activity")                       \
2819                                                                             \
2820   notproduct(intx, SweeperLogEntries, 1024,                                 \
2821             "Number of records in the ring buffer of sweeper activity")     \
2822                                                                             \
2823   notproduct(intx, MemProfilingInterval, 500,                               \
2824           "Time between each invocation of the MemProfiler")                \
2825                                                                             \
2826   develop(intx, MallocCatchPtr, -1,                                         \
2827           "Hit breakpoint when mallocing/freeing this pointer")             \
2828                                                                             \
2829   notproduct(intx, AssertRepeat, 1,                                         \
2830           "number of times to evaluate expression in assert "               \
2831           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2832                                                                             \
2833   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2834           "List of assertions (file:line) to muzzle")                       \
2835                                                                             \
2836   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2837           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2838           "is used")                                                        \
2839                                                                             \
2840   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2841           "Threshold for total handle allocation when "                     \
2842           "+TraceHandleAllocation is used")                                 \
2843                                                                             \
2844   develop(intx, StackPrintLimit, 100,                                       \
2845           "number of stack frames to print in VM-level stack dump")         \
2846                                                                             \
2847   notproduct(intx, MaxElementPrintSize, 256,                                \
2848           "maximum number of elements to print")                            \
2849                                                                             \
2850   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2851           "maximum number of subklasses to print when printing klass")      \
2852                                                                             \
2853   product(intx, MaxInlineLevel, 9,                                          \
2854           "maximum number of nested calls that are inlined")                \
2855                                                                             \
2856   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2857           "maximum number of nested recursive calls that are inlined")      \
2858                                                                             \
2859   product_pd(intx, InlineSmallCode,                                         \
2860           "Only inline already compiled methods if their code size is "     \
2861           "less than this")                                                 \
2862                                                                             \
2863   product(intx, MaxInlineSize, 35,                                          \
2864           "maximum bytecode size of a method to be inlined")                \
2865                                                                             \
2866   product_pd(intx, FreqInlineSize,                                          \
2867           "maximum bytecode size of a frequent method to be inlined")       \
2868                                                                             \
2869   product(intx, MaxTrivialSize, 6,                                          \
2870           "maximum bytecode size of a trivial method to be inlined")        \
2871                                                                             \
2872   product(intx, MinInliningThreshold, 250,                                  \
2873           "min. invocation count a method needs to have to be inlined")     \
2874                                                                             \
2875   develop(intx, MethodHistogramCutoff, 100,                                 \
2876           "cutoff value for method invoc. histogram (+CountCalls)")         \
2877                                                                             \
2878   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2879           "# of interpreted methods to show in profile")                    \
2880                                                                             \
2881   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2882           "# of compiled methods to show in profile")                       \
2883                                                                             \
2884   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2885           "# of stub methods to show in profile")                           \
2886                                                                             \
2887   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2888           "# of runtime stub nodes to show in profile")                     \
2889                                                                             \
2890   product(intx, ProfileIntervalsTicks, 100,                                 \
2891           "# of ticks between printing of interval profile "                \
2892           "(+ProfileIntervals)")                                            \
2893                                                                             \
2894   notproduct(intx, ScavengeALotInterval,     1,                             \
2895           "Interval between which scavenge will occur with +ScavengeALot")  \
2896                                                                             \
2897   notproduct(intx, FullGCALotInterval,     1,                               \
2898           "Interval between which full gc will occur with +FullGCALot")     \
2899                                                                             \
2900   notproduct(intx, FullGCALotStart,     0,                                  \
2901           "For which invocation to start FullGCAlot")                       \
2902                                                                             \
2903   notproduct(intx, FullGCALotDummies,  32*K,                                \
2904           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2905           "to move")                                                        \
2906                                                                             \
2907   develop(intx, DontYieldALotInterval,    10,                               \
2908           "Interval between which yields will be dropped (milliseconds)")   \
2909                                                                             \
2910   develop(intx, MinSleepInterval,     1,                                    \
2911           "Minimum sleep() interval (milliseconds) when "                   \
2912           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2913                                                                             \
2914   develop(intx, ProfilerPCTickThreshold,    15,                             \
2915           "Number of ticks in a PC buckets to be a hotspot")                \
2916                                                                             \
2917   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2918           "Number of exits until DeoptimizeALot kicks in")                  \
2919                                                                             \
2920   notproduct(intx, ZombieALotInterval,     5,                               \
2921           "Number of exits until ZombieALot kicks in")                      \
2922                                                                             \
2923   develop(bool, StressNonEntrant, false,                                    \
2924           "Mark nmethods non-entrant at registration")                      \
2925                                                                             \
2926   diagnostic(intx, MallocVerifyInterval,     0,                             \
2927           "if non-zero, verify C heap after every N calls to "              \
2928           "malloc/realloc/free")                                            \
2929                                                                             \
2930   diagnostic(intx, MallocVerifyStart,     0,                                \
2931           "if non-zero, start verifying C heap after Nth call to "          \
2932           "malloc/realloc/free")                                            \
2933                                                                             \
2934   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2935           "if non-zero, max # of Words that malloc/realloc can allocate "   \
2936           "(for testing only)")                                             \
2937                                                                             \
2938   product(intx, TypeProfileWidth,     2,                                    \
2939           "number of receiver types to record in call/cast profile")        \
2940                                                                             \
2941   develop(intx, BciProfileWidth,      2,                                    \
2942           "number of return bci's to record in ret profile")                \
2943                                                                             \
2944   product(intx, PerMethodRecompilationCutoff, 400,                          \
2945           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2946                                                                             \
2947   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
2948           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2949                                                                             \
2950   product(intx, PerMethodTrapLimit,  100,                                   \
2951           "Limit on traps (of one kind) in a method (includes inlines)")    \
2952                                                                             \
2953   product(intx, PerBytecodeTrapLimit,  4,                                   \
2954           "Limit on traps (of one kind) at a particular BCI")               \
2955                                                                             \
2956   develop(intx, InlineFrequencyRatio,    20,                                \
2957           "Ratio of call site execution to caller method invocation")       \
2958                                                                             \
2959   develop_pd(intx, InlineFrequencyCount,                                    \
2960           "Count of call site execution necessary to trigger frequent "     \
2961           "inlining")                                                       \
2962                                                                             \
2963   develop(intx, InlineThrowCount,    50,                                    \
2964           "Force inlining of interpreted methods that throw this often")    \
2965                                                                             \
2966   develop(intx, InlineThrowMaxSize,   200,                                  \
2967           "Force inlining of throwing methods smaller than this")           \
2968                                                                             \
2969   develop(intx, ProfilerNodeSize,  1024,                                    \
2970           "Size in K to allocate for the Profile Nodes of each thread")     \
2971                                                                             \
2972   product_pd(intx, PreInflateSpin,                                          \
2973           "Number of times to spin wait before inflation")                  \
2974                                                                             \
2975   /* gc parameters */                                                       \
2976   product(uintx, InitialHeapSize, 0,                                        \
2977           "Initial heap size (in bytes); zero means use ergonomics")        \
2978                                                                             \
2979   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
2980           "Maximum heap size (in bytes)")                                   \
2981                                                                             \
2982   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
2983           "Initial tenured generation size (in bytes)")                     \
2984                                                                             \
2985   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
2986           "Initial new generation size (in bytes)")                         \
2987                                                                             \
2988   product(uintx, MaxNewSize, max_uintx,                                     \
2989           "Maximum new generation size (in bytes), max_uintx means set "    \
2990           "ergonomically")                                                  \
2991                                                                             \
2992   product(uintx, PretenureSizeThreshold, 0,                                 \
2993           "Maximum size in bytes of objects allocated in DefNew "           \
2994           "generation; zero means no maximum")                              \
2995                                                                             \
2996   product(uintx, TLABSize, 0,                                               \
2997           "Starting TLAB size (in bytes); zero means set ergonomically")    \
2998                                                                             \
2999   product(uintx, MinTLABSize, 2*K,                                          \
3000           "Minimum allowed TLAB size (in bytes)")                           \
3001                                                                             \
3002   product(uintx, TLABAllocationWeight, 35,                                  \
3003           "Allocation averaging weight")                                    \
3004                                                                             \
3005   product(uintx, TLABWasteTargetPercent, 1,                                 \
3006           "Percentage of Eden that can be wasted")                          \
3007                                                                             \
3008   product(uintx, TLABRefillWasteFraction,    64,                            \
3009           "Max TLAB waste at a refill (internal fragmentation)")            \
3010                                                                             \
3011   product(uintx, TLABWasteIncrement,    4,                                  \
3012           "Increment allowed waste at slow allocation")                     \
3013                                                                             \
3014   product(uintx, SurvivorRatio, 8,                                          \
3015           "Ratio of eden/survivor space size")                              \
3016                                                                             \
3017   product(uintx, NewRatio, 2,                                               \
3018           "Ratio of new/old generation sizes")                              \
3019                                                                             \
3020   product_pd(uintx, NewSizeThreadIncrease,                                  \
3021           "Additional size added to desired new generation size per "       \
3022           "non-daemon thread (in bytes)")                                   \
3023                                                                             \
3024   product_pd(uintx, MetaspaceSize,                                          \
3025           "Initial size of Metaspaces (in bytes)")                          \
3026                                                                             \
3027   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3028           "Maximum size of Metaspaces (in bytes)")                          \
3029                                                                             \
3030   product(uintx, ClassMetaspaceSize, 2*M,                                   \
3031           "Maximum size of InstanceKlass area in Metaspace used for "       \
3032           "UseCompressedKlassPointers")                                     \
3033                                                                             \
3034   product(uintx, MinHeapFreeRatio,    40,                                   \
3035           "Min percentage of heap free after GC to avoid expansion")        \
3036                                                                             \
3037   product(uintx, MaxHeapFreeRatio,    70,                                   \
3038           "Max percentage of heap free after GC to avoid shrinking")        \
3039                                                                             \
3040   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3041           "Number of milliseconds per MB of free space in the heap")        \
3042                                                                             \
3043   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3044           "Min change in heap space due to GC (in bytes)")                  \
3045                                                                             \
3046   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3047           "Min expansion of Metaspace (in bytes)")                          \
3048                                                                             \
3049   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3050           "Min percentage of Metaspace free after GC to avoid expansion")   \
3051                                                                             \
3052   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3053           "Max percentage of Metaspace free after GC to avoid shrinking")   \
3054                                                                             \
3055   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3056           "Max expansion of Metaspace without full GC (in bytes)")          \
3057                                                                             \
3058   product(intx, QueuedAllocationWarningCount, 0,                            \
3059           "Number of times an allocation that queues behind a GC "          \
3060           "will retry before printing a warning")                           \
3061                                                                             \
3062   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3063           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3064                                                                             \
3065   diagnostic(intx, VerifyGCLevel,     0,                                    \
3066           "Generation level at which to start +VerifyBefore/AfterGC")       \
3067                                                                             \
3068   product(uintx, MaxTenuringThreshold,    15,                               \
3069           "Maximum value for tenuring threshold")                           \
3070                                                                             \
3071   product(uintx, InitialTenuringThreshold,    7,                            \
3072           "Initial value for tenuring threshold")                           \
3073                                                                             \
3074   product(uintx, TargetSurvivorRatio,    50,                                \
3075           "Desired percentage of survivor space used after scavenge")       \
3076                                                                             \
3077   product(uintx, MarkSweepDeadRatio,     5,                                 \
3078           "Percentage (0-100) of the old gen allowed as dead wood."         \
3079           "Serial mark sweep treats this as both the min and max value."    \
3080           "CMS uses this value only if it falls back to mark sweep."        \
3081           "Par compact uses a variable scale based on the density of the"   \
3082           "generation and treats this as the max value when the heap is"    \
3083           "either completely full or completely empty.  Par compact also"   \
3084           "has a smaller default value; see arguments.cpp.")                \
3085                                                                             \
3086   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
3087           "How often should we fully compact the heap (ignoring the dead "  \
3088           "space parameters)")                                              \
3089                                                                             \
3090   product(intx, PrintCMSStatistics, 0,                                      \
3091           "Statistics for CMS")                                             \
3092                                                                             \
3093   product(bool, PrintCMSInitiationStatistics, false,                        \
3094           "Statistics for initiating a CMS collection")                     \
3095                                                                             \
3096   product(intx, PrintFLSStatistics, 0,                                      \
3097           "Statistics for CMS' FreeListSpace")                              \
3098                                                                             \
3099   product(intx, PrintFLSCensus, 0,                                          \
3100           "Census for CMS' FreeListSpace")                                  \
3101                                                                             \
3102   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3103           "Delay in ms between expansion and allocation")                   \
3104                                                                             \
3105   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3106           "Delay in ms in scheduling GC workers")                           \
3107                                                                             \
3108   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3109           "(Unstable) Number of times to iterate in safepoint loop "        \
3110           " before blocking VM threads ")                                   \
3111                                                                             \
3112   product(intx, DeferPollingPageLoopCount,     -1,                          \
3113           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3114           "before changing safepoint polling page to RO ")                  \
3115                                                                             \
3116   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3117                                                                             \
3118   product(bool, PSChunkLargeArrays, true,                                   \
3119           "true: process large arrays in chunks")                           \
3120                                                                             \
3121   product(uintx, GCDrainStackTargetSize, 64,                                \
3122           "how many entries we'll try to leave on the stack during "        \
3123           "parallel GC")                                                    \
3124                                                                             \
3125   /* stack parameters */                                                    \
3126   product_pd(intx, StackYellowPages,                                        \
3127           "Number of yellow zone (recoverable overflows) pages")            \
3128                                                                             \
3129   product_pd(intx, StackRedPages,                                           \
3130           "Number of red zone (unrecoverable overflows) pages")             \
3131                                                                             \
3132   product_pd(intx, StackShadowPages,                                        \
3133           "Number of shadow zone (for overflow checking) pages"             \
3134           " this should exceed the depth of the VM and native call stack")  \
3135                                                                             \
3136   product_pd(intx, ThreadStackSize,                                         \
3137           "Thread Stack Size (in Kbytes)")                                  \
3138                                                                             \
3139   product_pd(intx, VMThreadStackSize,                                       \
3140           "Non-Java Thread Stack Size (in Kbytes)")                         \
3141                                                                             \
3142   product_pd(intx, CompilerThreadStackSize,                                 \
3143           "Compiler Thread Stack Size (in Kbytes)")                         \
3144                                                                             \
3145   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3146           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3147                                                                             \
3148   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3149           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3150           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3151           "disable this feature")                                           \
3152                                                                             \
3153   /* code cache parameters */                                               \
3154   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3155           "Code cache segment size (in bytes) - smallest unit of "          \
3156           "allocation")                                                     \
3157                                                                             \
3158   develop_pd(intx, CodeEntryAlignment,                                      \
3159           "Code entry alignment for generated code (in bytes)")             \
3160                                                                             \
3161   product_pd(intx, OptoLoopAlignment,                                       \
3162           "Align inner loops to zero relative to this modulus")             \
3163                                                                             \
3164   product_pd(uintx, InitialCodeCacheSize,                                   \
3165           "Initial code cache size (in bytes)")                             \
3166                                                                             \
3167   product_pd(uintx, ReservedCodeCacheSize,                                  \
3168           "Reserved code cache size (in bytes) - maximum code cache size")  \
3169                                                                             \
3170   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3171           "When less than X space left, we stop compiling.")                \
3172                                                                             \
3173   product_pd(uintx, CodeCacheExpansionSize,                                 \
3174           "Code cache expansion size (in bytes)")                           \
3175                                                                             \
3176   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3177           "Minimum number of segments in a code cache block.")              \
3178                                                                             \
3179   notproduct(bool, ExitOnFullCodeCache, false,                              \
3180           "Exit the VM if we fill the code cache.")                         \
3181                                                                             \
3182   product(bool, UseCodeCacheFlushing, true,                                 \
3183           "Attempt to clean the code cache before shutting off compiler")   \
3184                                                                             \
3185   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3186           "Min number of seconds between code cache cleaning sessions")     \
3187                                                                             \
3188   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3189           "When less than X space left, start code cache cleaning")         \
3190                                                                             \
3191   product(uintx, CodeCacheFlushingFraction, 2,                              \
3192           "Fraction of the code cache that is flushed when full")           \
3193                                                                             \
3194   /* interpreter debugging */                                               \
3195   develop(intx, BinarySwitchThreshold, 5,                                   \
3196           "Minimal number of lookupswitch entries for rewriting to binary " \
3197           "switch")                                                         \
3198                                                                             \
3199   develop(intx, StopInterpreterAt, 0,                                       \
3200           "Stops interpreter execution at specified bytecode number")       \
3201                                                                             \
3202   develop(intx, TraceBytecodesAt, 0,                                        \
3203           "Traces bytecodes starting with specified bytecode number")       \
3204                                                                             \
3205   /* compiler interface */                                                  \
3206   develop(intx, CIStart, 0,                                                 \
3207           "the id of the first compilation to permit")                      \
3208                                                                             \
3209   develop(intx, CIStop,    -1,                                              \
3210           "the id of the last compilation to permit")                       \
3211                                                                             \
3212   develop(intx, CIStartOSR,     0,                                          \
3213           "the id of the first osr compilation to permit "                  \
3214           "(CICountOSR must be on)")                                        \
3215                                                                             \
3216   develop(intx, CIStopOSR,    -1,                                           \
3217           "the id of the last osr compilation to permit "                   \
3218           "(CICountOSR must be on)")                                        \
3219                                                                             \
3220   develop(intx, CIBreakAtOSR,    -1,                                        \
3221           "id of osr compilation to break at")                              \
3222                                                                             \
3223   develop(intx, CIBreakAt,    -1,                                           \
3224           "id of compilation to break at")                                  \
3225                                                                             \
3226   product(ccstrlist, CompileOnly, "",                                       \
3227           "List of methods (pkg/class.name) to restrict compilation to")    \
3228                                                                             \
3229   product(ccstr, CompileCommandFile, NULL,                                  \
3230           "Read compiler commands from this file [.hotspot_compiler]")      \
3231                                                                             \
3232   product(ccstrlist, CompileCommand, "",                                    \
3233           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3234                                                                             \
3235   develop(bool, ReplayCompiles, false,                                      \
3236           "Enable replay of compilations from ReplayDataFile")              \
3237                                                                             \
3238   product(ccstr, ReplayDataFile, NULL,                                      \
3239           "File containing compilation replay information"                  \
3240           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3241                                                                             \
3242   develop(intx, ReplaySuppressInitializers, 2,                              \
3243           "Controls handling of class initialization during replay"         \
3244           "0 - don't do anything special"                                   \
3245           "1 - treat all class initializers as empty"                       \
3246           "2 - treat class initializers for application classes as empty"   \
3247           "3 - allow all class initializers to run during bootstrap but"    \
3248           "    pretend they are empty after starting replay")               \
3249                                                                             \
3250   develop(bool, ReplayIgnoreInitErrors, false,                              \
3251           "Ignore exceptions thrown during initialization for replay")      \
3252                                                                             \
3253   product(bool, DumpReplayDataOnError, true,                                \
3254           "Record replay data for crashing compiler threads")               \
3255                                                                             \
3256   product(bool, CICompilerCountPerCPU, false,                               \
3257           "1 compiler thread for log(N CPUs)")                              \
3258                                                                             \
3259   develop(intx, CIFireOOMAt,    -1,                                         \
3260           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3261           "(non-negative value throws OOM after this many CI accesses "     \
3262           "in each compile)")                                               \
3263   notproduct(intx, CICrashAt, -1,                                           \
3264           "id of compilation to trigger assert in compiler thread for "     \
3265           "the purpose of testing, e.g. generation of replay data")         \
3266   notproduct(bool, CIObjectFactoryVerify, false,                            \
3267           "enable potentially expensive verification in ciObjectFactory")   \
3268                                                                             \
3269   /* Priorities */                                                          \
3270   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3271                                                                             \
3272   product(intx, ThreadPriorityPolicy, 0,                                    \
3273           "0 : Normal.                                                     "\
3274           "    VM chooses priorities that are appropriate for normal       "\
3275           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3276           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3277           "    map to lower native priority values. On Windows applications"\
3278           "    are allowed to use higher native priorities. However, with  "\
3279           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3280           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3281           "    interfere with system threads. On Linux thread priorities   "\
3282           "    are ignored because the OS does not support static priority "\
3283           "    in SCHED_OTHER scheduling class which is the only choice for"\
3284           "    non-root, non-realtime applications.                        "\
3285           "1 : Aggressive.                                                 "\
3286           "    Java thread priorities map over to the entire range of      "\
3287           "    native thread priorities. Higher Java thread priorities map "\
3288           "    to higher native thread priorities. This policy should be   "\
3289           "    used with care, as sometimes it can cause performance       "\
3290           "    degradation in the application and/or the entire system. On "\
3291           "    Linux this policy requires root privilege.")                 \
3292                                                                             \
3293   product(bool, ThreadPriorityVerbose, false,                               \
3294           "Print priority changes")                                         \
3295                                                                             \
3296   product(intx, DefaultThreadPriority, -1,                                  \
3297           "The native priority at which threads run if not elsewhere "      \
3298           "specified (-1 means no change)")                                 \
3299                                                                             \
3300   product(intx, CompilerThreadPriority, -1,                                 \
3301           "The native priority at which compiler threads should run "       \
3302           "(-1 means no change)")                                           \
3303                                                                             \
3304   product(intx, VMThreadPriority, -1,                                       \
3305           "The native priority at which the VM thread should run "          \
3306           "(-1 means no change)")                                           \
3307                                                                             \
3308   product(bool, CompilerThreadHintNoPreempt, true,                          \
3309           "(Solaris only) Give compiler threads an extra quanta")           \
3310                                                                             \
3311   product(bool, VMThreadHintNoPreempt, false,                               \
3312           "(Solaris only) Give VM thread an extra quanta")                  \
3313                                                                             \
3314   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3315   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3316   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3317   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3318   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3319   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3320   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3321   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3322   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3323   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3324                                                                             \
3325   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3326           "Java thread priority 10 maps to critical scheduling priority")   \
3327                                                                             \
3328   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3329           "Compiler thread(s) run at critical scheduling priority")         \
3330                                                                             \
3331   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3332           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3333                                                                             \
3334   /* compiler debugging */                                                  \
3335   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3336           "First class to consider when using +CompileTheWorld")            \
3337                                                                             \
3338   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3339           "Last class to consider when using +CompileTheWorld")             \
3340                                                                             \
3341   develop(intx, NewCodeParameter,      0,                                   \
3342           "Testing Only: Create a dedicated integer parameter before "      \
3343           "putback")                                                        \
3344                                                                             \
3345   /* new oopmap storage allocation */                                       \
3346   develop(intx, MinOopMapAllocation,     8,                                 \
3347           "Minimum number of OopMap entries in an OopMapSet")               \
3348                                                                             \
3349   /* Background Compilation */                                              \
3350   develop(intx, LongCompileThreshold,     50,                               \
3351           "Used with +TraceLongCompiles")                                   \
3352                                                                             \
3353   product(intx, StarvationMonitorInterval,    200,                          \
3354           "Pause between each check in ms")                                 \
3355                                                                             \
3356   /* recompilation */                                                       \
3357   product_pd(intx, CompileThreshold,                                        \
3358           "number of interpreted method invocations before (re-)compiling") \
3359                                                                             \
3360   product_pd(intx, BackEdgeThreshold,                                       \
3361           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3362                                                                             \
3363   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3364           "Interpreter (tier 0) invocation notification frequency.")        \
3365                                                                             \
3366   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3367           "C1 without MDO (tier 2) invocation notification frequency.")     \
3368                                                                             \
3369   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3370           "C1 with MDO profiling (tier 3) invocation notification "         \
3371           "frequency.")                                                     \
3372                                                                             \
3373   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3374           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3375                                                                             \
3376   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3377           "Interpreter (tier 0) invocation notification frequency.")        \
3378                                                                             \
3379   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3380           "C1 without MDO (tier 2) invocation notification frequency.")     \
3381                                                                             \
3382   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3383           "C1 with MDO profiling (tier 3) invocation notification "         \
3384           "frequency.")                                                     \
3385                                                                             \
3386   product(intx, Tier2CompileThreshold, 0,                                   \
3387           "threshold at which tier 2 compilation is invoked")               \
3388                                                                             \
3389   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3390           "Back edge threshold at which tier 2 compilation is invoked")     \
3391                                                                             \
3392   product(intx, Tier3InvocationThreshold, 200,                              \
3393           "Compile if number of method invocations crosses this "           \
3394           "threshold")                                                      \
3395                                                                             \
3396   product(intx, Tier3MinInvocationThreshold, 100,                           \
3397           "Minimum invocation to compile at tier 3")                        \
3398                                                                             \
3399   product(intx, Tier3CompileThreshold, 2000,                                \
3400           "Threshold at which tier 3 compilation is invoked (invocation "   \
3401           "minimum must be satisfied.")                                     \
3402                                                                             \
3403   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3404           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3405                                                                             \
3406   product(intx, Tier4InvocationThreshold, 5000,                             \
3407           "Compile if number of method invocations crosses this "           \
3408           "threshold")                                                      \
3409                                                                             \
3410   product(intx, Tier4MinInvocationThreshold, 600,                           \
3411           "Minimum invocation to compile at tier 4")                        \
3412                                                                             \
3413   product(intx, Tier4CompileThreshold, 15000,                               \
3414           "Threshold at which tier 4 compilation is invoked (invocation "   \
3415           "minimum must be satisfied.")                                     \
3416                                                                             \
3417   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3418           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3419                                                                             \
3420   product(intx, Tier3DelayOn, 5,                                            \
3421           "If C2 queue size grows over this amount per compiler thread "    \
3422           "stop compiling at tier 3 and start compiling at tier 2")         \
3423                                                                             \
3424   product(intx, Tier3DelayOff, 2,                                           \
3425           "If C2 queue size is less than this amount per compiler thread "  \
3426           "allow methods compiled at tier 2 transition to tier 3")          \
3427                                                                             \
3428   product(intx, Tier3LoadFeedback, 5,                                       \
3429           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3430           "reaches this amount per compiler thread")                        \
3431                                                                             \
3432   product(intx, Tier4LoadFeedback, 3,                                       \
3433           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3434           "reaches this amount per compiler thread")                        \
3435                                                                             \
3436   product(intx, TieredCompileTaskTimeout, 50,                               \
3437           "Kill compile task if method was not used within "                \
3438           "given timeout in milliseconds")                                  \
3439                                                                             \
3440   product(intx, TieredStopAtLevel, 4,                                       \
3441           "Stop at given compilation level")                                \
3442                                                                             \
3443   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3444           "Start profiling in interpreter if the counters exceed tier 3"    \
3445           "thresholds by the specified percentage")                         \
3446                                                                             \
3447   product(intx, TieredRateUpdateMinTime, 1,                                 \
3448           "Minimum rate sampling interval (in milliseconds)")               \
3449                                                                             \
3450   product(intx, TieredRateUpdateMaxTime, 25,                                \
3451           "Maximum rate sampling interval (in milliseconds)")               \
3452                                                                             \
3453   product_pd(bool, TieredCompilation,                                       \
3454           "Enable tiered compilation")                                      \
3455                                                                             \
3456   product(bool, PrintTieredEvents, false,                                   \
3457           "Print tiered events notifications")                              \
3458                                                                             \
3459   product_pd(intx, OnStackReplacePercentage,                                \
3460           "NON_TIERED number of method invocations/branches (expressed as %"\
3461           "of CompileThreshold) before (re-)compiling OSR code")            \
3462                                                                             \
3463   product(intx, InterpreterProfilePercentage, 33,                           \
3464           "NON_TIERED number of method invocations/branches (expressed as %"\
3465           "of CompileThreshold) before profiling in the interpreter")       \
3466                                                                             \
3467   develop(intx, MaxRecompilationSearchLength,    10,                        \
3468           "max. # frames to inspect searching for recompilee")              \
3469                                                                             \
3470   develop(intx, MaxInterpretedSearchLength,     3,                          \
3471           "max. # interp. frames to skip when searching for recompilee")    \
3472                                                                             \
3473   develop(intx, DesiredMethodLimit,  8000,                                  \
3474           "desired max. method size (in bytecodes) after inlining")         \
3475                                                                             \
3476   develop(intx, HugeMethodLimit,  8000,                                     \
3477           "don't compile methods larger than this if "                      \
3478           "+DontCompileHugeMethods")                                        \
3479                                                                             \
3480   /* New JDK 1.4 reflection implementation */                               \
3481                                                                             \
3482   develop(bool, UseNewReflection, true,                                     \
3483           "Temporary flag for transition to reflection based on dynamic "   \
3484           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3485           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3486           "changes were needed")                                            \
3487                                                                             \
3488   develop(bool, VerifyReflectionBytecodes, false,                           \
3489           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3490           "in situations like that described in 4486457 or for "            \
3491           "constructors generated for serialization, so can not be enabled "\
3492           "in product.")                                                    \
3493                                                                             \
3494   product(bool, ReflectionWrapResolutionErrors, true,                       \
3495           "Temporary flag for transition to AbstractMethodError wrapped "   \
3496           "in InvocationTargetException. See 6531596")                      \
3497                                                                             \
3498                                                                             \
3499   develop(intx, FastSuperclassLimit, 8,                                     \
3500           "Depth of hardwired instanceof accelerator array")                \
3501                                                                             \
3502   /* Properties for Java libraries  */                                      \
3503                                                                             \
3504   product(uintx, MaxDirectMemorySize, 0,                                    \
3505           "Maximum total size of NIO direct-buffer allocations")            \
3506                                                                             \
3507   /* temporary developer defined flags  */                                  \
3508                                                                             \
3509   diagnostic(bool, UseNewCode, false,                                       \
3510           "Testing Only: Use the new version while testing")                \
3511                                                                             \
3512   diagnostic(bool, UseNewCode2, false,                                      \
3513           "Testing Only: Use the new version while testing")                \
3514                                                                             \
3515   diagnostic(bool, UseNewCode3, false,                                      \
3516           "Testing Only: Use the new version while testing")                \
3517                                                                             \
3518   /* flags for performance data collection */                               \
3519                                                                             \
3520   product(bool, UsePerfData, falseInEmbedded,                               \
3521           "Flag to disable jvmstat instrumentation for performance testing" \
3522           "and problem isolation purposes.")                                \
3523                                                                             \
3524   product(bool, PerfDataSaveToFile, false,                                  \
3525           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3526                                                                             \
3527   product(ccstr, PerfDataSaveFile, NULL,                                    \
3528           "Save PerfData memory to the specified absolute pathname,"        \
3529            "%p in the file name if present will be replaced by pid")        \
3530                                                                             \
3531   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3532           "Data sampling interval in milliseconds")                         \
3533                                                                             \
3534   develop(bool, PerfTraceDataCreation, false,                               \
3535           "Trace creation of Performance Data Entries")                     \
3536                                                                             \
3537   develop(bool, PerfTraceMemOps, false,                                     \
3538           "Trace PerfMemory create/attach/detach calls")                    \
3539                                                                             \
3540   product(bool, PerfDisableSharedMem, false,                                \
3541           "Store performance data in standard memory")                      \
3542                                                                             \
3543   product(intx, PerfDataMemorySize, 32*K,                                   \
3544           "Size of performance data memory region. Will be rounded "        \
3545           "up to a multiple of the native os page size.")                   \
3546                                                                             \
3547   product(intx, PerfMaxStringConstLength, 1024,                             \
3548           "Maximum PerfStringConstant string length before truncation")     \
3549                                                                             \
3550   product(bool, PerfAllowAtExitRegistration, false,                         \
3551           "Allow registration of atexit() methods")                         \
3552                                                                             \
3553   product(bool, PerfBypassFileSystemCheck, false,                           \
3554           "Bypass Win32 file system criteria checks (Windows Only)")        \
3555                                                                             \
3556   product(intx, UnguardOnExecutionViolation, 0,                             \
3557           "Unguard page and retry on no-execute fault (Win32 only)"         \
3558           "0=off, 1=conservative, 2=aggressive")                            \
3559                                                                             \
3560   /* Serviceability Support */                                              \
3561                                                                             \
3562   product(bool, ManagementServer, false,                                    \
3563           "Create JMX Management Server")                                   \
3564                                                                             \
3565   product(bool, DisableAttachMechanism, false,                              \
3566          "Disable mechanism that allows tools to attach to this VM")        \
3567                                                                             \
3568   product(bool, StartAttachListener, false,                                 \
3569           "Always start Attach Listener at VM startup")                     \
3570                                                                             \
3571   manageable(bool, PrintConcurrentLocks, false,                             \
3572           "Print java.util.concurrent locks in thread dump")                \
3573                                                                             \
3574   product(bool, TransmitErrorReport, false,                                 \
3575           "Enable error report transmission on erroneous termination")      \
3576                                                                             \
3577   product(ccstr, ErrorReportServer, NULL,                                   \
3578           "Override built-in error report server address")                  \
3579                                                                             \
3580   /* Shared spaces */                                                       \
3581                                                                             \
3582   product(bool, UseSharedSpaces, true,                                      \
3583           "Use shared spaces for metadata")                                 \
3584                                                                             \
3585   product(bool, RequireSharedSpaces, false,                                 \
3586           "Require shared spaces for metadata")                             \
3587                                                                             \
3588   product(bool, DumpSharedSpaces, false,                                    \
3589            "Special mode: JVM reads a class list, loads classes, builds "   \
3590             "shared spaces, and dumps the shared spaces to a file to be "   \
3591             "used in future JVM runs.")                                     \
3592                                                                             \
3593   product(bool, PrintSharedSpaces, false,                                   \
3594           "Print usage of shared spaces")                                   \
3595                                                                             \
3596   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3597           "Size of read-write space for metadata (in bytes)")               \
3598                                                                             \
3599   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3600           "Size of read-only space for metadata (in bytes)")                \
3601                                                                             \
3602   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3603           "Size of the shared miscellaneous data area (in bytes)")          \
3604                                                                             \
3605   product(uintx, SharedMiscCodeSize,    120*K,                              \
3606           "Size of the shared miscellaneous code area (in bytes)")          \
3607                                                                             \
3608   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3609           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3610           "Address to allocate shared memory region for class data")        \
3611                                                                             \
3612   diagnostic(bool, EnableInvokeDynamic, true,                               \
3613           "support JSR 292 (method handles, invokedynamic, "                \
3614           "anonymous classes")                                              \
3615                                                                             \
3616   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3617           "Print generated stub code for method handles")                   \
3618                                                                             \
3619   develop(bool, TraceMethodHandles, false,                                  \
3620           "trace internal method handle operations")                        \
3621                                                                             \
3622   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3623           "perform extra checks when constructing method handles")          \
3624                                                                             \
3625   diagnostic(bool, ShowHiddenFrames, false,                                 \
3626           "show method handle implementation frames (usually hidden)")      \
3627                                                                             \
3628   experimental(bool, TrustFinalNonStaticFields, false,                      \
3629           "trust final non-static declarations for constant folding")       \
3630                                                                             \
3631   develop(bool, TraceInvokeDynamic, false,                                  \
3632           "trace internal invoke dynamic operations")                       \
3633                                                                             \
3634   diagnostic(bool, PauseAtStartup,      false,                              \
3635           "Causes the VM to pause at startup time and wait for the pause "  \
3636           "file to be removed (default: ./vm.paused.<pid>)")                \
3637                                                                             \
3638   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3639           "The file to create and for whose removal to await when pausing " \
3640           "at startup. (default: ./vm.paused.<pid>)")                       \
3641                                                                             \
3642   diagnostic(bool, PauseAtExit, false,                                      \
3643           "Pause and wait for keypress on exit if a debugger is attached")  \
3644                                                                             \
3645   product(bool, ExtendedDTraceProbes,    false,                             \
3646           "Enable performance-impacting dtrace probes")                     \
3647                                                                             \
3648   product(bool, DTraceMethodProbes, false,                                  \
3649           "Enable dtrace probes for method-entry and method-exit")          \
3650                                                                             \
3651   product(bool, DTraceAllocProbes, false,                                   \
3652           "Enable dtrace probes for object allocation")                     \
3653                                                                             \
3654   product(bool, DTraceMonitorProbes, false,                                 \
3655           "Enable dtrace probes for monitor events")                        \
3656                                                                             \
3657   product(bool, RelaxAccessControlCheck, false,                             \
3658           "Relax the access control checks in the verifier")                \
3659                                                                             \
3660   diagnostic(bool, PrintDTraceDOF, false,                                   \
3661              "Print the DTrace DOF passed to the system for JSDT probes")   \
3662                                                                             \
3663   product(uintx, StringTableSize, defaultStringTableSize,                   \
3664           "Number of buckets in the interned String table")                 \
3665                                                                             \
3666   develop(bool, TraceDefaultMethods, false,                                 \
3667           "Trace the default method processing steps")                      \
3668                                                                             \
3669   develop(bool, ParseAllGenericSignatures, false,                           \
3670           "Parse all generic signatures while classloading")                \
3671                                                                             \
3672   develop(bool, VerifyGenericSignatures, false,                             \
3673           "Abort VM on erroneous or inconsistent generic signatures")       \
3674                                                                             \
3675   product(bool, UseVMInterruptibleIO, false,                                \
3676           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3677           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3678           " of this flag is true for JDK 6 and earlier")                    \
3679                                                                             \
3680   diagnostic(bool, WhiteBoxAPI, false,                                      \
3681           "Enable internal testing APIs")                                   \
3682                                                                             \
3683   product(bool, PrintGCCause, true,                                         \
3684           "Include GC cause in GC logging")                                 \
3685                                                                             \
3686   product(bool , AllowNonVirtualCalls, false,                               \
3687           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3688                                                                             \
3689   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3690           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3691           "Allocation less than this value will be allocated "              \
3692           "using malloc. Larger allocations will use mmap.")
3693 
3694 /*
3695  *  Macros for factoring of globals
3696  */
3697 
3698 // Interface macros
3699 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3700 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3701 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3702 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3703 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3704 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3705 #ifdef PRODUCT
3706 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3707 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3708 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3709 #else
3710 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3711 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3712 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3713 #endif
3714 // Special LP64 flags, product only needed for now.
3715 #ifdef _LP64
3716 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3717 #else
3718 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3719 #endif // _LP64
3720 
3721 // Implementation macros
3722 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3723 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3724 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3725 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3726 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3727 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3728 #ifdef PRODUCT
3729 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3730 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3731 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3732 #else
3733 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3734 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3735 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3736 #endif
3737 #ifdef _LP64
3738 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3739 #else
3740 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3741 #endif // _LP64
3742 
3743 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)
3744 
3745 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3746 
3747 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3748 
3749 // Extensions
3750 
3751 #include "runtime/globals_ext.hpp"
3752 
3753 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP