1 /*
   2  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP
  26 #define SHARE_VM_RUNTIME_GLOBALS_HPP
  27 
  28 #include "utilities/debug.hpp"
  29 
  30 // use this for flags that are true per default in the tiered build
  31 // but false in non-tiered builds, and vice versa
  32 #ifdef TIERED
  33 #define  trueInTiered true
  34 #define falseInTiered false
  35 #else
  36 #define  trueInTiered false
  37 #define falseInTiered true
  38 #endif
  39 
  40 #ifdef TARGET_ARCH_x86
  41 # include "globals_x86.hpp"
  42 #endif
  43 #ifdef TARGET_ARCH_sparc
  44 # include "globals_sparc.hpp"
  45 #endif
  46 #ifdef TARGET_ARCH_zero
  47 # include "globals_zero.hpp"
  48 #endif
  49 #ifdef TARGET_ARCH_arm
  50 # include "globals_arm.hpp"
  51 #endif
  52 #ifdef TARGET_ARCH_ppc
  53 # include "globals_ppc.hpp"
  54 #endif
  55 #ifdef TARGET_OS_FAMILY_linux
  56 # include "globals_linux.hpp"
  57 #endif
  58 #ifdef TARGET_OS_FAMILY_solaris
  59 # include "globals_solaris.hpp"
  60 #endif
  61 #ifdef TARGET_OS_FAMILY_windows
  62 # include "globals_windows.hpp"
  63 #endif
  64 #ifdef TARGET_OS_FAMILY_bsd
  65 # include "globals_bsd.hpp"
  66 #endif
  67 #ifdef TARGET_OS_ARCH_linux_x86
  68 # include "globals_linux_x86.hpp"
  69 #endif
  70 #ifdef TARGET_OS_ARCH_linux_sparc
  71 # include "globals_linux_sparc.hpp"
  72 #endif
  73 #ifdef TARGET_OS_ARCH_linux_zero
  74 # include "globals_linux_zero.hpp"
  75 #endif
  76 #ifdef TARGET_OS_ARCH_solaris_x86
  77 # include "globals_solaris_x86.hpp"
  78 #endif
  79 #ifdef TARGET_OS_ARCH_solaris_sparc
  80 # include "globals_solaris_sparc.hpp"
  81 #endif
  82 #ifdef TARGET_OS_ARCH_windows_x86
  83 # include "globals_windows_x86.hpp"
  84 #endif
  85 #ifdef TARGET_OS_ARCH_linux_arm
  86 # include "globals_linux_arm.hpp"
  87 #endif
  88 #ifdef TARGET_OS_ARCH_linux_ppc
  89 # include "globals_linux_ppc.hpp"
  90 #endif
  91 #ifdef TARGET_OS_ARCH_bsd_x86
  92 # include "globals_bsd_x86.hpp"
  93 #endif
  94 #ifdef TARGET_OS_ARCH_bsd_zero
  95 # include "globals_bsd_zero.hpp"
  96 #endif
  97 #ifdef COMPILER1
  98 #ifdef TARGET_ARCH_x86
  99 # include "c1_globals_x86.hpp"
 100 #endif
 101 #ifdef TARGET_ARCH_sparc
 102 # include "c1_globals_sparc.hpp"
 103 #endif
 104 #ifdef TARGET_ARCH_arm
 105 # include "c1_globals_arm.hpp"
 106 #endif
 107 #ifdef TARGET_ARCH_ppc
 108 # include "c1_globals_ppc.hpp"
 109 #endif
 110 #ifdef TARGET_OS_FAMILY_linux
 111 # include "c1_globals_linux.hpp"
 112 #endif
 113 #ifdef TARGET_OS_FAMILY_solaris
 114 # include "c1_globals_solaris.hpp"
 115 #endif
 116 #ifdef TARGET_OS_FAMILY_windows
 117 # include "c1_globals_windows.hpp"
 118 #endif
 119 #ifdef TARGET_OS_FAMILY_bsd
 120 # include "c1_globals_bsd.hpp"
 121 #endif
 122 #endif
 123 #ifdef COMPILER2
 124 #ifdef TARGET_ARCH_x86
 125 # include "c2_globals_x86.hpp"
 126 #endif
 127 #ifdef TARGET_ARCH_sparc
 128 # include "c2_globals_sparc.hpp"
 129 #endif
 130 #ifdef TARGET_ARCH_arm
 131 # include "c2_globals_arm.hpp"
 132 #endif
 133 #ifdef TARGET_OS_FAMILY_linux
 134 # include "c2_globals_linux.hpp"
 135 #endif
 136 #ifdef TARGET_OS_FAMILY_solaris
 137 # include "c2_globals_solaris.hpp"
 138 #endif
 139 #ifdef TARGET_OS_FAMILY_windows
 140 # include "c2_globals_windows.hpp"
 141 #endif
 142 #ifdef TARGET_OS_FAMILY_bsd
 143 # include "c2_globals_bsd.hpp"
 144 #endif
 145 #endif
 146 #ifdef SHARK
 147 #ifdef TARGET_ARCH_zero
 148 # include "shark_globals_zero.hpp"
 149 #endif
 150 #endif
 151 
 152 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
 153 define_pd_global(bool, BackgroundCompilation,        false);
 154 define_pd_global(bool, UseTLAB,                      false);
 155 define_pd_global(bool, CICompileOSR,                 false);
 156 define_pd_global(bool, UseTypeProfile,               false);
 157 define_pd_global(bool, UseOnStackReplacement,        false);
 158 define_pd_global(bool, InlineIntrinsics,             false);
 159 define_pd_global(bool, PreferInterpreterNativeStubs, true);
 160 define_pd_global(bool, ProfileInterpreter,           false);
 161 define_pd_global(bool, ProfileTraps,                 false);
 162 define_pd_global(bool, TieredCompilation,            false);
 163 
 164 define_pd_global(intx, CompileThreshold,             0);
 165 define_pd_global(intx, BackEdgeThreshold,            0);
 166 
 167 define_pd_global(intx, OnStackReplacePercentage,     0);
 168 define_pd_global(bool, ResizeTLAB,                   false);
 169 define_pd_global(intx, FreqInlineSize,               0);
 170 define_pd_global(intx, InlineSmallCode,              0);
 171 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
 172 define_pd_global(intx, InlineClassNatives,           true);
 173 define_pd_global(intx, InlineUnsafeOps,              true);
 174 define_pd_global(intx, InitialCodeCacheSize,         160*K);
 175 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
 176 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
 177 define_pd_global(intx, CodeCacheMinBlockLength,      1);
 178 define_pd_global(intx, CodeCacheMinimumUseSpace,     200*K);
 179 define_pd_global(uintx,MetaspaceSize,    ScaleForWordSize(4*M));
 180 define_pd_global(bool, NeverActAsServerClassMachine, true);
 181 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
 182 #define CI_COMPILER_COUNT 0
 183 #else
 184 
 185 #ifdef COMPILER2
 186 #define CI_COMPILER_COUNT 2
 187 #else
 188 #define CI_COMPILER_COUNT 1
 189 #endif // COMPILER2
 190 
 191 #endif // no compilers
 192 
 193 // string type aliases used only in this file
 194 typedef const char* ccstr;
 195 typedef const char* ccstrlist;   // represents string arguments which accumulate
 196 
 197 enum FlagValueOrigin {
 198   DEFAULT          = 0,
 199   COMMAND_LINE     = 1,
 200   ENVIRON_VAR      = 2,
 201   CONFIG_FILE      = 3,
 202   MANAGEMENT       = 4,
 203   ERGONOMIC        = 5,
 204   ATTACH_ON_DEMAND = 6,
 205   INTERNAL         = 99
 206 };
 207 
 208 struct Flag {
 209   const char *type;
 210   const char *name;
 211   void*       addr;
 212 
 213   NOT_PRODUCT(const char *doc;)
 214 
 215   const char *kind;
 216   FlagValueOrigin origin;
 217 
 218   // points to all Flags static array
 219   static Flag *flags;
 220 
 221   // number of flags
 222   static size_t numFlags;
 223 
 224   static Flag* find_flag(const char* name, size_t length, bool allow_locked = false);
 225   static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false);
 226 
 227   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 228   bool get_bool() const       { return *((bool*) addr); }
 229   void set_bool(bool value)   { *((bool*) addr) = value; }
 230 
 231   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 232   intx get_intx() const       { return *((intx*) addr); }
 233   void set_intx(intx value)   { *((intx*) addr) = value; }
 234 
 235   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 236   uintx get_uintx() const     { return *((uintx*) addr); }
 237   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 238 
 239   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 240   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 241   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 242 
 243   bool is_double() const        { return strcmp(type, "double") == 0; }
 244   double get_double() const     { return *((double*) addr); }
 245   void set_double(double value) { *((double*) addr) = value; }
 246 
 247   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 248   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 249   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 250   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 251 
 252   bool is_unlocker() const;
 253   bool is_unlocked() const;
 254   bool is_writeable() const;
 255   bool is_external() const;
 256 
 257   bool is_unlocker_ext() const;
 258   bool is_unlocked_ext() const;
 259   bool is_writeable_ext() const;
 260   bool is_external_ext() const;
 261 
 262   void get_locked_message(char*, int) const;
 263   void get_locked_message_ext(char*, int) const;
 264 
 265   void print_on(outputStream* st, bool withComments = false );
 266   void print_as_flag(outputStream* st);
 267 };
 268 
 269 // debug flags control various aspects of the VM and are global accessible
 270 
 271 // use FlagSetting to temporarily change some debug flag
 272 // e.g. FlagSetting fs(DebugThisAndThat, true);
 273 // restored to previous value upon leaving scope
 274 class FlagSetting {
 275   bool val;
 276   bool* flag;
 277  public:
 278   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 279   ~FlagSetting()                       { *flag = val; }
 280 };
 281 
 282 
 283 class CounterSetting {
 284   intx* counter;
 285  public:
 286   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 287   ~CounterSetting()         { (*counter)--; }
 288 };
 289 
 290 
 291 class UIntFlagSetting {
 292   uintx val;
 293   uintx* flag;
 294  public:
 295   UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; }
 296   ~UIntFlagSetting()                         { *flag = val; }
 297 };
 298 
 299 
 300 class DoubleFlagSetting {
 301   double val;
 302   double* flag;
 303  public:
 304   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 305   ~DoubleFlagSetting()                           { *flag = val; }
 306 };
 307 
 308 
 309 class CommandLineFlags {
 310  public:
 311   static bool boolAt(char* name, size_t len, bool* value);
 312   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 313   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 314   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 315 
 316   static bool intxAt(char* name, size_t len, intx* value);
 317   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 318   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 319   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 320 
 321   static bool uintxAt(char* name, size_t len, uintx* value);
 322   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 323   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 324   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 325 
 326   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 327   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 328   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 329   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 330 
 331   static bool doubleAt(char* name, size_t len, double* value);
 332   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 333   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 334   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 335 
 336   static bool ccstrAt(char* name, size_t len, ccstr* value);
 337   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 338   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 339   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 340 
 341   // Returns false if name is not a command line flag.
 342   static bool wasSetOnCmdline(const char* name, bool* value);
 343   static void printSetFlags(outputStream* out);
 344 
 345   static void printFlags(outputStream* out, bool withComments);
 346 
 347   static void verify() PRODUCT_RETURN;
 348 };
 349 
 350 // use this for flags that are true by default in the debug version but
 351 // false in the optimized version, and vice versa
 352 #ifdef ASSERT
 353 #define trueInDebug  true
 354 #define falseInDebug false
 355 #else
 356 #define trueInDebug  false
 357 #define falseInDebug true
 358 #endif
 359 
 360 // use this for flags that are true per default in the product build
 361 // but false in development builds, and vice versa
 362 #ifdef PRODUCT
 363 #define trueInProduct  true
 364 #define falseInProduct false
 365 #else
 366 #define trueInProduct  false
 367 #define falseInProduct true
 368 #endif
 369 
 370 #ifdef JAVASE_EMBEDDED
 371 #define falseInEmbedded false
 372 #else
 373 #define falseInEmbedded true
 374 #endif
 375 
 376 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 377 // product flags are always settable / visible
 378 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 379 
 380 // A flag must be declared with one of the following types:
 381 // bool, intx, uintx, ccstr.
 382 // The type "ccstr" is an alias for "const char*" and is used
 383 // only in this file, because the macrology requires single-token type names.
 384 
 385 // Note: Diagnostic options not meant for VM tuning or for product modes.
 386 // They are to be used for VM quality assurance or field diagnosis
 387 // of VM bugs.  They are hidden so that users will not be encouraged to
 388 // try them as if they were VM ordinary execution options.  However, they
 389 // are available in the product version of the VM.  Under instruction
 390 // from support engineers, VM customers can turn them on to collect
 391 // diagnostic information about VM problems.  To use a VM diagnostic
 392 // option, you must first specify +UnlockDiagnosticVMOptions.
 393 // (This master switch also affects the behavior of -Xprintflags.)
 394 //
 395 // experimental flags are in support of features that are not
 396 //    part of the officially supported product, but are available
 397 //    for experimenting with. They could, for example, be performance
 398 //    features that may not have undergone full or rigorous QA, but which may
 399 //    help performance in some cases and released for experimentation
 400 //    by the community of users and developers. This flag also allows one to
 401 //    be able to build a fully supported product that nonetheless also
 402 //    ships with some unsupported, lightly tested, experimental features.
 403 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 404 //    UnlockExperimentalVMOptions flag, which allows the control and
 405 //    modification of the experimental flags.
 406 //
 407 // Nota bene: neither diagnostic nor experimental options should be used casually,
 408 //    and they are not supported on production loads, except under explicit
 409 //    direction from support engineers.
 410 //
 411 // manageable flags are writeable external product flags.
 412 //    They are dynamically writeable through the JDK management interface
 413 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 414 //    These flags are external exported interface (see CCC).  The list of
 415 //    manageable flags can be queried programmatically through the management
 416 //    interface.
 417 //
 418 //    A flag can be made as "manageable" only if
 419 //    - the flag is defined in a CCC as an external exported interface.
 420 //    - the VM implementation supports dynamic setting of the flag.
 421 //      This implies that the VM must *always* query the flag variable
 422 //      and not reuse state related to the flag state at any given time.
 423 //    - you want the flag to be queried programmatically by the customers.
 424 //
 425 // product_rw flags are writeable internal product flags.
 426 //    They are like "manageable" flags but for internal/private use.
 427 //    The list of product_rw flags are internal/private flags which
 428 //    may be changed/removed in a future release.  It can be set
 429 //    through the management interface to get/set value
 430 //    when the name of flag is supplied.
 431 //
 432 //    A flag can be made as "product_rw" only if
 433 //    - the VM implementation supports dynamic setting of the flag.
 434 //      This implies that the VM must *always* query the flag variable
 435 //      and not reuse state related to the flag state at any given time.
 436 //
 437 // Note that when there is a need to support develop flags to be writeable,
 438 // it can be done in the same way as product_rw.
 439 
 440 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 441                                                                             \
 442   lp64_product(bool, UseCompressedOops, false,                              \
 443             "Use 32-bit object references in 64-bit VM  "                   \
 444             "lp64_product means flag is always constant in 32 bit VM")      \
 445                                                                             \
 446   lp64_product(bool, UseCompressedKlassPointers, false,                     \
 447             "Use 32-bit klass pointers in 64-bit VM  "                      \
 448             "lp64_product means flag is always constant in 32 bit VM")      \
 449                                                                             \
 450   notproduct(bool, CheckCompressedOops, true,                               \
 451             "generate checks in encoding/decoding code in debug VM")        \
 452                                                                             \
 453   product_pd(uintx, HeapBaseMinAddress,                                     \
 454             "OS specific low limit for heap base address")                  \
 455                                                                             \
 456   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 457             "Print compressed oops base address and encoding mode")         \
 458                                                                             \
 459   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 460           "Default object alignment in bytes, 8 is minimum")                \
 461                                                                             \
 462   product(bool, AssumeMP, false,                                            \
 463           "Instruct the VM to assume multiple processors are available")    \
 464                                                                             \
 465   /* UseMembar is theoretically a temp flag used for memory barrier         \
 466    * removal testing.  It was supposed to be removed before FCS but has     \
 467    * been re-added (see 6401008) */                                         \
 468   product_pd(bool, UseMembar,                                               \
 469           "(Unstable) Issues membars on thread state transitions")          \
 470                                                                             \
 471   /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms    \
 472    * that don't support it.  This will be replaced by processor detection   \
 473    * logic.                                                                 \
 474    */                                                                       \
 475   product(bool, UsePPCLWSYNC, true,                                         \
 476           "Use lwsync instruction if true, else use slower sync")           \
 477                                                                             \
 478   develop(bool, CleanChunkPoolAsync, falseInEmbedded,                       \
 479           "Whether to clean the chunk pool asynchronously")                 \
 480                                                                             \
 481   /* Temporary: See 6948537 */                                              \
 482   experimental(bool, UseMemSetInBOT, true,                                  \
 483           "(Unstable) uses memset in BOT updates in GC code")               \
 484                                                                             \
 485   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 486           "Enable normal processing of flags relating to field diagnostics")\
 487                                                                             \
 488   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 489           "Enable normal processing of flags relating to experimental features")\
 490                                                                             \
 491   product(bool, JavaMonitorsInStackTrace, true,                             \
 492           "Print info. about Java monitor locks when the stacks are dumped")\
 493                                                                             \
 494   product_pd(bool, UseLargePages,                                           \
 495           "Use large page memory")                                          \
 496                                                                             \
 497   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 498           "Allocate large pages individually for better affinity")          \
 499                                                                             \
 500   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 501           "Fail large pages individual allocation")                         \
 502                                                                             \
 503   develop(bool, TracePageSizes, false,                                      \
 504           "Trace page size selection and usage.")                           \
 505                                                                             \
 506   product(bool, UseNUMA, false,                                             \
 507           "Use NUMA if available")                                          \
 508                                                                             \
 509   product(bool, UseNUMAInterleaving, false,                                 \
 510           "Interleave memory across NUMA nodes if available")               \
 511                                                                             \
 512   product(uintx, NUMAInterleaveGranularity, 2*M,                            \
 513           "Granularity to use for NUMA interleaving on Windows OS")         \
 514                                                                             \
 515   product(bool, ForceNUMA, false,                                           \
 516           "Force NUMA optimizations on single-node/UMA systems")            \
 517                                                                             \
 518   product(uintx, NUMAChunkResizeWeight, 20,                                 \
 519           "Percentage (0-100) used to weigh the current sample when "      \
 520           "computing exponentially decaying average for "                   \
 521           "AdaptiveNUMAChunkSizing")                                        \
 522                                                                             \
 523   product(uintx, NUMASpaceResizeRate, 1*G,                                  \
 524           "Do not reallocate more that this amount per collection")         \
 525                                                                             \
 526   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 527           "Enable adaptive chunk sizing for NUMA")                          \
 528                                                                             \
 529   product(bool, NUMAStats, false,                                           \
 530           "Print NUMA stats in detailed heap information")                  \
 531                                                                             \
 532   product(uintx, NUMAPageScanRate, 256,                                     \
 533           "Maximum number of pages to include in the page scan procedure")  \
 534                                                                             \
 535   product_pd(bool, NeedsDeoptSuspend,                                       \
 536           "True for register window machines (sparc/ia64)")                 \
 537                                                                             \
 538   product(intx, UseSSE, 99,                                                 \
 539           "Highest supported SSE instructions set on x86/x64")              \
 540                                                                             \
 541   product(bool, UseAES, false,                                               \
 542           "Control whether AES instructions can be used on x86/x64")        \
 543                                                                             \
 544   product(uintx, LargePageSizeInBytes, 0,                                   \
 545           "Large page size (0 to let VM choose the page size")              \
 546                                                                             \
 547   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 548           "Use large pages if max heap is at least this big")               \
 549                                                                             \
 550   product(bool, ForceTimeHighResolution, false,                             \
 551           "Using high time resolution(For Win32 only)")                     \
 552                                                                             \
 553   develop(bool, TraceItables, false,                                        \
 554           "Trace initialization and use of itables")                        \
 555                                                                             \
 556   develop(bool, TracePcPatching, false,                                     \
 557           "Trace usage of frame::patch_pc")                                 \
 558                                                                             \
 559   develop(bool, TraceJumps, false,                                          \
 560           "Trace assembly jumps in thread ring buffer")                     \
 561                                                                             \
 562   develop(bool, TraceRelocator, false,                                      \
 563           "Trace the bytecode relocator")                                   \
 564                                                                             \
 565   develop(bool, TraceLongCompiles, false,                                   \
 566           "Print out every time compilation is longer than "                \
 567           "a given threashold")                                             \
 568                                                                             \
 569   develop(bool, SafepointALot, false,                                       \
 570           "Generates a lot of safepoints. Works with "                      \
 571           "GuaranteedSafepointInterval")                                    \
 572                                                                             \
 573   product_pd(bool, BackgroundCompilation,                                   \
 574           "A thread requesting compilation is not blocked during "          \
 575           "compilation")                                                    \
 576                                                                             \
 577   product(bool, PrintVMQWaitTime, false,                                    \
 578           "Prints out the waiting time in VM operation queue")              \
 579                                                                             \
 580   develop(bool, NoYieldsInMicrolock, false,                                 \
 581           "Disable yields in microlock")                                    \
 582                                                                             \
 583   develop(bool, TraceOopMapGeneration, false,                               \
 584           "Shows oopmap generation")                                        \
 585                                                                             \
 586   product(bool, MethodFlushing, true,                                       \
 587           "Reclamation of zombie and not-entrant methods")                  \
 588                                                                             \
 589   develop(bool, VerifyStack, false,                                         \
 590           "Verify stack of each thread when it is entering a runtime call") \
 591                                                                             \
 592   diagnostic(bool, ForceUnreachable, false,                                 \
 593           "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \
 594                                                                             \
 595   notproduct(bool, StressDerivedPointers, false,                            \
 596           "Force scavenge when a derived pointers is detected on stack "    \
 597           "after rtm call")                                                 \
 598                                                                             \
 599   develop(bool, TraceDerivedPointers, false,                                \
 600           "Trace traversal of derived pointers on stack")                   \
 601                                                                             \
 602   notproduct(bool, TraceCodeBlobStacks, false,                              \
 603           "Trace stack-walk of codeblobs")                                  \
 604                                                                             \
 605   product(bool, PrintJNIResolving, false,                                   \
 606           "Used to implement -v:jni")                                       \
 607                                                                             \
 608   notproduct(bool, PrintRewrites, false,                                    \
 609           "Print methods that are being rewritten")                         \
 610                                                                             \
 611   product(bool, UseInlineCaches, true,                                      \
 612           "Use Inline Caches for virtual calls ")                           \
 613                                                                             \
 614   develop(bool, InlineArrayCopy, true,                                      \
 615           "inline arraycopy native that is known to be part of "            \
 616           "base library DLL")                                               \
 617                                                                             \
 618   develop(bool, InlineObjectHash, true,                                     \
 619           "inline Object::hashCode() native that is known to be part "      \
 620           "of base library DLL")                                            \
 621                                                                             \
 622   develop(bool, InlineNatives, true,                                        \
 623           "inline natives that are known to be part of base library DLL")   \
 624                                                                             \
 625   develop(bool, InlineMathNatives, true,                                    \
 626           "inline SinD, CosD, etc.")                                        \
 627                                                                             \
 628   develop(bool, InlineClassNatives, true,                                   \
 629           "inline Class.isInstance, etc")                                   \
 630                                                                             \
 631   develop(bool, InlineThreadNatives, true,                                  \
 632           "inline Thread.currentThread, etc")                               \
 633                                                                             \
 634   develop(bool, InlineUnsafeOps, true,                                      \
 635           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 636                                                                             \
 637   product(bool, CriticalJNINatives, true,                                   \
 638           "check for critical JNI entry points")                            \
 639                                                                             \
 640   notproduct(bool, StressCriticalJNINatives, false,                         \
 641             "Exercise register saving code in critical natives")            \
 642                                                                             \
 643   product(bool, UseSSE42Intrinsics, false,                                  \
 644           "SSE4.2 versions of intrinsics")                                  \
 645                                                                             \
 646   product(bool, UseAESIntrinsics, false,                                    \
 647           "use intrinsics for AES versions of crypto")                      \
 648                                                                             \
 649   product(bool, UseCRC32Intrinsics, false,                                  \
 650           "use intrinsics for java.util.zip.CRC32")                         \
 651                                                                             \
 652   develop(bool, TraceCallFixup, false,                                      \
 653           "traces all call fixups")                                         \
 654                                                                             \
 655   develop(bool, DeoptimizeALot, false,                                      \
 656           "deoptimize at every exit from the runtime system")               \
 657                                                                             \
 658   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 659           "a comma separated list of bcis to deoptimize at")                \
 660                                                                             \
 661   product(bool, DeoptimizeRandom, false,                                    \
 662           "deoptimize random frames on random exit from the runtime system")\
 663                                                                             \
 664   notproduct(bool, ZombieALot, false,                                       \
 665           "creates zombies (non-entrant) at exit from the runt. system")    \
 666                                                                             \
 667   product(bool, UnlinkSymbolsALot, false,                                   \
 668           "unlink unreferenced symbols from the symbol table at safepoints")\
 669                                                                             \
 670   notproduct(bool, WalkStackALot, false,                                    \
 671           "trace stack (no print) at every exit from the runtime system")   \
 672                                                                             \
 673   product(bool, Debugging, false,                                           \
 674           "set when executing debug methods in debug.ccp "                  \
 675           "(to prevent triggering assertions)")                             \
 676                                                                             \
 677   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 678           "Enable strict checks that safepoints cannot happen for threads " \
 679           "that used No_Safepoint_Verifier")                                \
 680                                                                             \
 681   notproduct(bool, VerifyLastFrame, false,                                  \
 682           "Verify oops on last frame on entry to VM")                       \
 683                                                                             \
 684   develop(bool, TraceHandleAllocation, false,                               \
 685           "Prints out warnings when suspicious many handles are allocated") \
 686                                                                             \
 687   product(bool, UseCompilerSafepoints, true,                                \
 688           "Stop at safepoints in compiled code")                            \
 689                                                                             \
 690   product(bool, FailOverToOldVerifier, true,                                \
 691           "fail over to old verifier when split verifier fails")            \
 692                                                                             \
 693   develop(bool, ShowSafepointMsgs, false,                                   \
 694           "Show msg. about safepoint synch.")                               \
 695                                                                             \
 696   product(bool, SafepointTimeout, false,                                    \
 697           "Time out and warn or fail after SafepointTimeoutDelay "          \
 698           "milliseconds if failed to reach safepoint")                      \
 699                                                                             \
 700   develop(bool, DieOnSafepointTimeout, false,                               \
 701           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 702                                                                             \
 703   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 704   /* typically, at most a few retries are needed */                         \
 705   product(intx, SuspendRetryCount, 50,                                      \
 706           "Maximum retry count for an external suspend request")            \
 707                                                                             \
 708   product(intx, SuspendRetryDelay, 5,                                       \
 709           "Milliseconds to delay per retry (* current_retry_count)")        \
 710                                                                             \
 711   product(bool, AssertOnSuspendWaitFailure, false,                          \
 712           "Assert/Guarantee on external suspend wait failure")              \
 713                                                                             \
 714   product(bool, TraceSuspendWaitFailures, false,                            \
 715           "Trace external suspend wait failures")                           \
 716                                                                             \
 717   product(bool, MaxFDLimit, true,                                           \
 718           "Bump the number of file descriptors to max in solaris.")         \
 719                                                                             \
 720   diagnostic(bool, LogEvents, true,                                         \
 721              "Enable the various ring buffer event logs")                   \
 722                                                                             \
 723   diagnostic(uintx, LogEventsBufferEntries, 10,                             \
 724              "Enable the various ring buffer event logs")                   \
 725                                                                             \
 726   product(bool, BytecodeVerificationRemote, true,                           \
 727           "Enables the Java bytecode verifier for remote classes")          \
 728                                                                             \
 729   product(bool, BytecodeVerificationLocal, false,                           \
 730           "Enables the Java bytecode verifier for local classes")           \
 731                                                                             \
 732   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 733           "Force exceptions on FP stack under/overflow")                    \
 734                                                                             \
 735   develop(bool, VerifyStackAtCalls, false,                                  \
 736           "Verify that the stack pointer is unchanged after calls")         \
 737                                                                             \
 738   develop(bool, TraceJavaAssertions, false,                                 \
 739           "Trace java language assertions")                                 \
 740                                                                             \
 741   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 742           "temporary - see javaClasses.cpp")                                \
 743                                                                             \
 744   notproduct(bool, PrintMallocFree, false,                                  \
 745           "Trace calls to C heap malloc/free allocation")                   \
 746                                                                             \
 747   product(bool, PrintOopAddress, false,                                     \
 748           "Always print the location of the oop")                           \
 749                                                                             \
 750   notproduct(bool, VerifyCodeCacheOften, false,                             \
 751           "Verify compiled-code cache often")                               \
 752                                                                             \
 753   develop(bool, ZapDeadCompiledLocals, false,                               \
 754           "Zap dead locals in compiler frames")                             \
 755                                                                             \
 756   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 757           "Zap dead locals (old version, zaps all frames when "             \
 758           "entering the VM")                                                \
 759                                                                             \
 760   notproduct(bool, CheckOopishValues, false,                                \
 761           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 762                                                                             \
 763   develop(bool, UseMallocOnly, false,                                       \
 764           "use only malloc/free for allocation (no resource area/arena)")   \
 765                                                                             \
 766   develop(bool, PrintMalloc, false,                                         \
 767           "print all malloc/free calls")                                    \
 768                                                                             \
 769   develop(bool, PrintMallocStatistics, false,                               \
 770           "print malloc/free statistics")                                   \
 771                                                                             \
 772   develop(bool, ZapResourceArea, trueInDebug,                               \
 773           "Zap freed resource/arena space with 0xABABABAB")                 \
 774                                                                             \
 775   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 776           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 777                                                                             \
 778   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 779           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 780                                                                             \
 781   notproduct(bool, ZapStackSegments, trueInDebug,                           \
 782              "Zap allocated/freed Stack segments with 0xFADFADED")          \
 783                                                                             \
 784   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 785           "Zap unused heap space with 0xBAADBABE")                          \
 786                                                                             \
 787   develop(bool, TraceZapUnusedHeapArea, false,                              \
 788           "Trace zapping of unused heap space")                             \
 789                                                                             \
 790   develop(bool, CheckZapUnusedHeapArea, false,                              \
 791           "Check zapping of unused heap space")                             \
 792                                                                             \
 793   develop(bool, ZapFillerObjects, trueInDebug,                              \
 794           "Zap filler objects with 0xDEAFBABE")                             \
 795                                                                             \
 796   develop(bool, PrintVMMessages, true,                                      \
 797           "Print vm messages on console")                                   \
 798                                                                             \
 799   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 800           "Print the time the application has been running")                \
 801                                                                             \
 802   product(bool, PrintGCApplicationStoppedTime, false,                       \
 803           "Print the time the application has been stopped")                \
 804                                                                             \
 805   diagnostic(bool, VerboseVerification, false,                              \
 806              "Display detailed verification details")                       \
 807                                                                             \
 808   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 809           "If > 0, provokes an error after VM initialization; the value"    \
 810           "determines which error to provoke.  See test_error_handler()"    \
 811           "in debug.cpp.")                                                  \
 812                                                                             \
 813   develop(bool, Verbose, false,                                             \
 814           "Prints additional debugging information from other modes")       \
 815                                                                             \
 816   develop(bool, PrintMiscellaneous, false,                                  \
 817           "Prints uncategorized debugging information (requires +Verbose)") \
 818                                                                             \
 819   develop(bool, WizardMode, false,                                          \
 820           "Prints much more debugging information")                         \
 821                                                                             \
 822   product(bool, ShowMessageBoxOnError, false,                               \
 823           "Keep process alive on VM fatal error")                           \
 824                                                                             \
 825   product(bool, CreateMinidumpOnCrash, false,                               \
 826           "Create minidump on VM fatal error")                              \
 827                                                                             \
 828   product_pd(bool, UseOSErrorReporting,                                     \
 829           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 830                                                                             \
 831   product(bool, SuppressFatalErrorMessage, false,                           \
 832           "Do NO Fatal Error report [Avoid deadlock]")                      \
 833                                                                             \
 834   product(ccstrlist, OnError, "",                                           \
 835           "Run user-defined commands on fatal error; see VMError.cpp "      \
 836           "for examples")                                                   \
 837                                                                             \
 838   product(ccstrlist, OnOutOfMemoryError, "",                                \
 839           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 840                                                                             \
 841   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 842           "Dump heap to file before any major stop-world GC")               \
 843                                                                             \
 844   manageable(bool, HeapDumpAfterFullGC, false,                              \
 845           "Dump heap to file after any major stop-world GC")                \
 846                                                                             \
 847   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 848           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 849                                                                             \
 850   manageable(ccstr, HeapDumpPath, NULL,                                     \
 851           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 852           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 853           "in the working directory)")                                      \
 854                                                                             \
 855   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 856           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 857           "when the heap usage is larger than this")                        \
 858                                                                             \
 859   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 860           "Approximate segment size when generating a segmented heap dump") \
 861                                                                             \
 862   develop(bool, BreakAtWarning, false,                                      \
 863           "Execute breakpoint upon encountering VM warning")                \
 864                                                                             \
 865   develop(bool, TraceVMOperation, false,                                    \
 866           "Trace vm operations")                                            \
 867                                                                             \
 868   develop(bool, UseFakeTimers, false,                                       \
 869           "Tells whether the VM should use system time or a fake timer")    \
 870                                                                             \
 871   product(ccstr, NativeMemoryTracking, "off",                               \
 872           "Native memory tracking options")                                 \
 873                                                                             \
 874   diagnostic(bool, PrintNMTStatistics, false,                               \
 875           "Print native memory tracking summary data if it is on")          \
 876                                                                             \
 877   diagnostic(bool, AutoShutdownNMT, true,                                   \
 878           "Automatically shutdown native memory tracking under stress "     \
 879           "situation. When set to false, native memory tracking tries to "  \
 880           "stay alive at the expense of JVM performance")                   \
 881                                                                             \
 882   diagnostic(bool, LogCompilation, false,                                   \
 883           "Log compilation activity in detail to hotspot.log or LogFile")   \
 884                                                                             \
 885   product(bool, PrintCompilation, false,                                    \
 886           "Print compilations")                                             \
 887                                                                             \
 888   diagnostic(bool, TraceNMethodInstalls, false,                             \
 889              "Trace nmethod intallation")                                   \
 890                                                                             \
 891   diagnostic(intx, ScavengeRootsInCode, 2,                                  \
 892              "0: do not allow scavengable oops in the code cache; "         \
 893              "1: allow scavenging from the code cache; "                    \
 894              "2: emit as many constants as the compiler can see")           \
 895                                                                             \
 896   product(bool, AlwaysRestoreFPU, false,                                    \
 897           "Restore the FPU control word after every JNI call (expensive)")  \
 898                                                                             \
 899   diagnostic(bool, PrintCompilation2, false,                                \
 900           "Print additional statistics per compilation")                    \
 901                                                                             \
 902   diagnostic(bool, PrintAdapterHandlers, false,                             \
 903           "Print code generated for i2c/c2i adapters")                      \
 904                                                                             \
 905   diagnostic(bool, VerifyAdapterCalls, trueInDebug,                         \
 906           "Verify that i2c/c2i adapters are called properly")               \
 907                                                                             \
 908   develop(bool, VerifyAdapterSharing, false,                                \
 909           "Verify that the code for shared adapters is the equivalent")     \
 910                                                                             \
 911   diagnostic(bool, PrintAssembly, false,                                    \
 912           "Print assembly code (using external disassembler.so)")           \
 913                                                                             \
 914   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 915           "Options string passed to disassembler.so")                       \
 916                                                                             \
 917   diagnostic(bool, PrintNMethods, false,                                    \
 918           "Print assembly code for nmethods when generated")                \
 919                                                                             \
 920   diagnostic(bool, PrintNativeNMethods, false,                              \
 921           "Print assembly code for native nmethods when generated")         \
 922                                                                             \
 923   develop(bool, PrintDebugInfo, false,                                      \
 924           "Print debug information for all nmethods when generated")        \
 925                                                                             \
 926   develop(bool, PrintRelocations, false,                                    \
 927           "Print relocation information for all nmethods when generated")   \
 928                                                                             \
 929   develop(bool, PrintDependencies, false,                                   \
 930           "Print dependency information for all nmethods when generated")   \
 931                                                                             \
 932   develop(bool, PrintExceptionHandlers, false,                              \
 933           "Print exception handler tables for all nmethods when generated") \
 934                                                                             \
 935   develop(bool, StressCompiledExceptionHandlers, false,                     \
 936          "Exercise compiled exception handlers")                            \
 937                                                                             \
 938   develop(bool, InterceptOSException, false,                                \
 939           "Starts debugger when an implicit OS (e.g., NULL) "               \
 940           "exception happens")                                              \
 941                                                                             \
 942   product(bool, PrintCodeCache, false,                                      \
 943           "Print the code cache memory usage when exiting")                 \
 944                                                                             \
 945   develop(bool, PrintCodeCache2, false,                                     \
 946           "Print detailed usage info on the code cache when exiting")       \
 947                                                                             \
 948   product(bool, PrintCodeCacheOnCompilation, false,                         \
 949           "Print the code cache memory usage each time a method is compiled") \
 950                                                                             \
 951   diagnostic(bool, PrintStubCode, false,                                    \
 952           "Print generated stub code")                                      \
 953                                                                             \
 954   product(bool, StackTraceInThrowable, true,                                \
 955           "Collect backtrace in throwable when exception happens")          \
 956                                                                             \
 957   product(bool, OmitStackTraceInFastThrow, true,                            \
 958           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 959                                                                             \
 960   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 961           "Prints byte code statictics when dumping profiler output")       \
 962                                                                             \
 963   product(bool, ProfilerRecordPC, false,                                    \
 964           "Collects tick for each 16 byte interval of compiled code")       \
 965                                                                             \
 966   product(bool, ProfileVM, false,                                           \
 967           "Profiles ticks that fall within VM (either in the VM Thread "    \
 968           "or VM code called through stubs)")                               \
 969                                                                             \
 970   product(bool, ProfileIntervals, false,                                    \
 971           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 972                                                                             \
 973   notproduct(bool, ProfilerCheckIntervals, false,                           \
 974           "Collect and print info on spacing of profiler ticks")            \
 975                                                                             \
 976   develop(bool, PrintJVMWarnings, false,                                    \
 977           "Prints warnings for unimplemented JVM functions")                \
 978                                                                             \
 979   product(bool, PrintWarnings, true,                                        \
 980           "Prints JVM warnings to output stream")                           \
 981                                                                             \
 982   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 983           "Prints warnings for stalled SpinLocks")                          \
 984                                                                             \
 985   product(bool, RegisterFinalizersAtInit, true,                             \
 986           "Register finalizable objects at end of Object.<init> or "        \
 987           "after allocation")                                               \
 988                                                                             \
 989   develop(bool, RegisterReferences, true,                                   \
 990           "Tells whether the VM should register soft/weak/final/phantom "   \
 991           "references")                                                     \
 992                                                                             \
 993   develop(bool, IgnoreRewrites, false,                                      \
 994           "Supress rewrites of bytecodes in the oopmap generator. "         \
 995           "This is unsafe!")                                                \
 996                                                                             \
 997   develop(bool, PrintCodeCacheExtension, false,                             \
 998           "Print extension of code cache")                                  \
 999                                                                             \
1000   develop(bool, UsePrivilegedStack, true,                                   \
1001           "Enable the security JVM functions")                              \
1002                                                                             \
1003   develop(bool, ProtectionDomainVerification, true,                         \
1004           "Verifies protection domain before resolution in system "         \
1005           "dictionary")                                                     \
1006                                                                             \
1007   product(bool, ClassUnloading, true,                                       \
1008           "Do unloading of classes")                                        \
1009                                                                             \
1010   develop(bool, DisableStartThread, false,                                  \
1011           "Disable starting of additional Java threads "                    \
1012           "(for debugging only)")                                           \
1013                                                                             \
1014   develop(bool, MemProfiling, false,                                        \
1015           "Write memory usage profiling to log file")                       \
1016                                                                             \
1017   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
1018           "Prints the system dictionary at exit")                           \
1019                                                                             \
1020   experimental(intx, PredictedLoadedClassCount, 0,                          \
1021           "Experimental: Tune loaded class cache starting size.")           \
1022                                                                             \
1023   diagnostic(bool, UnsyncloadClass, false,                                  \
1024           "Unstable: VM calls loadClass unsynchronized. Custom "            \
1025           "class loader  must call VM synchronized for findClass "          \
1026           "and defineClass.")                                               \
1027                                                                             \
1028   product(bool, AlwaysLockClassLoader, false,                               \
1029           "Require the VM to acquire the class loader lock before calling " \
1030           "loadClass() even for class loaders registering "                 \
1031           "as parallel capable")                                            \
1032                                                                             \
1033   product(bool, AllowParallelDefineClass, false,                            \
1034           "Allow parallel defineClass requests for class loaders "          \
1035           "registering as parallel capable")                                \
1036                                                                             \
1037   product(bool, MustCallLoadClassInternal, false,                           \
1038           "Call loadClassInternal() rather than loadClass()")               \
1039                                                                             \
1040   product_pd(bool, DontYieldALot,                                           \
1041           "Throw away obvious excess yield calls (for SOLARIS only)")       \
1042                                                                             \
1043   product_pd(bool, ConvertSleepToYield,                                     \
1044           "Converts sleep(0) to thread yield "                              \
1045           "(may be off for SOLARIS to improve GUI)")                        \
1046                                                                             \
1047   product(bool, ConvertYieldToSleep, false,                                 \
1048           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
1049           "behavior (SOLARIS only)")                                        \
1050                                                                             \
1051   product(bool, UseBoundThreads, true,                                      \
1052           "Bind user level threads to kernel threads (for SOLARIS only)")   \
1053                                                                             \
1054   develop(bool, UseDetachedThreads, true,                                   \
1055           "Use detached threads that are recycled upon termination "        \
1056           "(for SOLARIS only)")                                             \
1057                                                                             \
1058   product(bool, UseLWPSynchronization, true,                                \
1059           "Use LWP-based instead of libthread-based synchronization "       \
1060           "(SPARC only)")                                                   \
1061                                                                             \
1062   product(ccstr, SyncKnobs, NULL,                                           \
1063           "(Unstable) Various monitor synchronization tunables")            \
1064                                                                             \
1065   product(intx, EmitSync, 0,                                                \
1066           "(Unsafe,Unstable) "                                              \
1067           " Controls emission of inline sync fast-path code")               \
1068                                                                             \
1069   product(intx, MonitorBound, 0, "Bound Monitor population")                \
1070                                                                             \
1071   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
1072                                                                             \
1073   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
1074                                                                             \
1075   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
1076                                                                             \
1077   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
1078                                                                             \
1079   product(intx, hashCode, 5,                                                \
1080          "(Unstable) select hashCode generation algorithm" )                \
1081                                                                             \
1082   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
1083          "(Unstable, Linux-specific)"                                       \
1084          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
1085                                                                             \
1086   product(bool, FilterSpuriousWakeups, true,                                \
1087           "Prevent spurious or premature wakeups from object.wait "         \
1088           "(Solaris only)")                                                 \
1089                                                                             \
1090   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
1091   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
1092   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
1093                                                                             \
1094   develop(bool, UsePthreads, false,                                         \
1095           "Use pthread-based instead of libthread-based synchronization "   \
1096           "(SPARC only)")                                                   \
1097                                                                             \
1098   product(bool, AdjustConcurrency, false,                                   \
1099           "call thr_setconcurrency at thread create time to avoid "         \
1100           "LWP starvation on MP systems (For Solaris Only)")                \
1101                                                                             \
1102   product(bool, ReduceSignalUsage, false,                                   \
1103           "Reduce the use of OS signals in Java and/or the VM")             \
1104                                                                             \
1105   develop_pd(bool, ShareVtableStubs,                                        \
1106           "Share vtable stubs (smaller code but worse branch prediction")   \
1107                                                                             \
1108   develop(bool, LoadLineNumberTables, true,                                 \
1109           "Tells whether the class file parser loads line number tables")   \
1110                                                                             \
1111   develop(bool, LoadLocalVariableTables, true,                              \
1112           "Tells whether the class file parser loads local variable tables")\
1113                                                                             \
1114   develop(bool, LoadLocalVariableTypeTables, true,                          \
1115           "Tells whether the class file parser loads local variable type tables")\
1116                                                                             \
1117   product(bool, AllowUserSignalHandlers, false,                             \
1118           "Do not complain if the application installs signal handlers "    \
1119           "(Solaris & Linux only)")                                         \
1120                                                                             \
1121   product(bool, UseSignalChaining, true,                                    \
1122           "Use signal-chaining to invoke signal handlers installed "        \
1123           "by the application (Solaris & Linux only)")                      \
1124                                                                             \
1125   product(bool, UseAltSigs, false,                                          \
1126           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1127           "internal signals (Solaris only)")                                \
1128                                                                             \
1129   product(bool, AllowJNIEnvProxy, false,                                    \
1130           "Allow JNIEnv proxies for jdbx")                                  \
1131                                                                             \
1132   product(bool, JNIDetachReleasesMonitors, true,                            \
1133           "JNI DetachCurrentThread releases monitors owned by thread")      \
1134                                                                             \
1135   product(bool, RestoreMXCSROnJNICalls, false,                              \
1136           "Restore MXCSR when returning from JNI calls")                    \
1137                                                                             \
1138   product(bool, CheckJNICalls, false,                                       \
1139           "Verify all arguments to JNI calls")                              \
1140                                                                             \
1141   product(bool, UseFastJNIAccessors, true,                                  \
1142           "Use optimized versions of Get<Primitive>Field")                  \
1143                                                                             \
1144   product(bool, EagerXrunInit, false,                                       \
1145           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1146           " but not all -Xrun libraries may support the state of the VM at this time") \
1147                                                                             \
1148   product(bool, PreserveAllAnnotations, false,                              \
1149           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1150                                                                             \
1151   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1152           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1153                                                                             \
1154   product(bool, LazyBootClassLoader, true,                                  \
1155           "Enable/disable lazy opening of boot class path entries")         \
1156                                                                             \
1157   product(bool, UseXMMForArrayCopy, false,                                  \
1158           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1159                                                                             \
1160   product(intx, FieldsAllocationStyle, 1,                                   \
1161           "0 - type based with oops first, 1 - with oops last, "            \
1162           "2 - oops in super and sub classes are together")                 \
1163                                                                             \
1164   product(bool, CompactFields, true,                                        \
1165           "Allocate nonstatic fields in gaps between previous fields")      \
1166                                                                             \
1167   notproduct(bool, PrintFieldLayout, false,                                 \
1168           "Print field layout for each class")                              \
1169                                                                             \
1170   product(intx, ContendedPaddingWidth, 128,                                 \
1171           "How many bytes to pad the fields/classes marked @Contended with")\
1172                                                                             \
1173   product(bool, EnableContended, true,                                      \
1174           "Enable @Contended annotation support")                           \
1175                                                                             \
1176   product(bool, RestrictContended, true,                                    \
1177           "Restrict @Contended to trusted classes")                         \
1178                                                                             \
1179   product(bool, UseBiasedLocking, true,                                     \
1180           "Enable biased locking in JVM")                                   \
1181                                                                             \
1182   product(intx, BiasedLockingStartupDelay, 4000,                            \
1183           "Number of milliseconds to wait before enabling biased locking")  \
1184                                                                             \
1185   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1186           "Print statistics of biased locking in JVM")                      \
1187                                                                             \
1188   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1189           "Threshold of number of revocations per type to try to "          \
1190           "rebias all objects in the heap of that type")                    \
1191                                                                             \
1192   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1193           "Threshold of number of revocations per type to permanently "     \
1194           "revoke biases of all objects in the heap of that type")          \
1195                                                                             \
1196   product(intx, BiasedLockingDecayTime, 25000,                              \
1197           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1198           "type after previous bulk rebias")                                \
1199                                                                             \
1200   /* tracing */                                                             \
1201                                                                             \
1202   notproduct(bool, TraceRuntimeCalls, false,                                \
1203           "Trace run-time calls")                                           \
1204                                                                             \
1205   develop(bool, TraceJNICalls, false,                                       \
1206           "Trace JNI calls")                                                \
1207                                                                             \
1208   notproduct(bool, TraceJVMCalls, false,                                    \
1209           "Trace JVM calls")                                                \
1210                                                                             \
1211   product(ccstr, TraceJVMTI, NULL,                                          \
1212           "Trace flags for JVMTI functions and events")                     \
1213                                                                             \
1214   /* This option can change an EMCP method into an obsolete method. */      \
1215   /* This can affect tests that except specific methods to be EMCP. */      \
1216   /* This option should be used with caution. */                            \
1217   product(bool, StressLdcRewrite, false,                                    \
1218           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1219                                                                             \
1220   product(intx, TraceRedefineClasses, 0,                                    \
1221           "Trace level for JVMTI RedefineClasses")                          \
1222                                                                             \
1223   develop(bool, StressMethodComparator, false,                              \
1224           "run the MethodComparator on all loaded methods")                 \
1225                                                                             \
1226   /* change to false by default sometime after Mustang */                   \
1227   product(bool, VerifyMergedCPBytecodes, true,                              \
1228           "Verify bytecodes after RedefineClasses constant pool merging")   \
1229                                                                             \
1230   develop(bool, TraceJNIHandleAllocation, false,                            \
1231           "Trace allocation/deallocation of JNI handle blocks")             \
1232                                                                             \
1233   develop(bool, TraceThreadEvents, false,                                   \
1234           "Trace all thread events")                                        \
1235                                                                             \
1236   develop(bool, TraceBytecodes, false,                                      \
1237           "Trace bytecode execution")                                       \
1238                                                                             \
1239   develop(bool, TraceClassInitialization, false,                            \
1240           "Trace class initialization")                                     \
1241                                                                             \
1242   develop(bool, TraceExceptions, false,                                     \
1243           "Trace exceptions")                                               \
1244                                                                             \
1245   develop(bool, TraceICs, false,                                            \
1246           "Trace inline cache changes")                                     \
1247                                                                             \
1248   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1249           "Trace method invocation counter overflow")                       \
1250                                                                             \
1251   develop(bool, TraceInlineCacheClearing, false,                            \
1252           "Trace clearing of inline caches in nmethods")                    \
1253                                                                             \
1254   develop(bool, TraceDependencies, false,                                   \
1255           "Trace dependencies")                                             \
1256                                                                             \
1257   develop(bool, VerifyDependencies, trueInDebug,                            \
1258          "Exercise and verify the compilation dependency mechanism")        \
1259                                                                             \
1260   develop(bool, TraceNewOopMapGeneration, false,                            \
1261           "Trace OopMapGeneration")                                         \
1262                                                                             \
1263   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1264           "Trace OopMapGeneration: print detailed cell states")             \
1265                                                                             \
1266   develop(bool, TimeOopMap, false,                                          \
1267           "Time calls to GenerateOopMap::compute_map() in sum")             \
1268                                                                             \
1269   develop(bool, TimeOopMap2, false,                                         \
1270           "Time calls to GenerateOopMap::compute_map() individually")       \
1271                                                                             \
1272   develop(bool, TraceMonitorMismatch, false,                                \
1273           "Trace monitor matching failures during OopMapGeneration")        \
1274                                                                             \
1275   develop(bool, TraceOopMapRewrites, false,                                 \
1276           "Trace rewritting of method oops during oop map generation")      \
1277                                                                             \
1278   develop(bool, TraceSafepoint, false,                                      \
1279           "Trace safepoint operations")                                     \
1280                                                                             \
1281   develop(bool, TraceICBuffer, false,                                       \
1282           "Trace usage of IC buffer")                                       \
1283                                                                             \
1284   develop(bool, TraceCompiledIC, false,                                     \
1285           "Trace changes of compiled IC")                                   \
1286                                                                             \
1287   notproduct(bool, TraceZapDeadLocals, false,                               \
1288           "Trace zapping dead locals")                                      \
1289                                                                             \
1290   develop(bool, TraceStartupTime, false,                                    \
1291           "Trace setup time")                                               \
1292                                                                             \
1293   develop(bool, TraceProtectionDomainVerification, false,                   \
1294           "Trace protection domain verifcation")                            \
1295                                                                             \
1296   develop(bool, TraceClearedExceptions, false,                              \
1297           "Prints when an exception is forcibly cleared")                   \
1298                                                                             \
1299   product(bool, TraceClassResolution, false,                                \
1300           "Trace all constant pool resolutions (for debugging)")            \
1301                                                                             \
1302   product(bool, TraceBiasedLocking, false,                                  \
1303           "Trace biased locking in JVM")                                    \
1304                                                                             \
1305   product(bool, TraceMonitorInflation, false,                               \
1306           "Trace monitor inflation in JVM")                                 \
1307                                                                             \
1308   /* gc */                                                                  \
1309                                                                             \
1310   product(bool, UseSerialGC, false,                                         \
1311           "Use the serial garbage collector")                               \
1312                                                                             \
1313   product(bool, UseG1GC, false,                                             \
1314           "Use the Garbage-First garbage collector")                        \
1315                                                                             \
1316   product(bool, UseParallelGC, false,                                       \
1317           "Use the Parallel Scavenge garbage collector")                    \
1318                                                                             \
1319   product(bool, UseParallelOldGC, false,                                    \
1320           "Use the Parallel Old garbage collector")                         \
1321                                                                             \
1322   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1323           "How often should we maximally compact the heap (not allowing "   \
1324           "any dead space)")                                                \
1325                                                                             \
1326   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1327           "The collection count for the first maximum compaction")          \
1328                                                                             \
1329   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1330           "In the Parallel Old garbage collector maximum compaction for "   \
1331           "a system GC")                                                    \
1332                                                                             \
1333   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1334           "The mean used by the par compact dead wood"                      \
1335           "limiter (a number between 0-100).")                              \
1336                                                                             \
1337   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1338           "The standard deviation used by the par compact dead wood"        \
1339           "limiter (a number between 0-100).")                              \
1340                                                                             \
1341   product(uintx, ParallelGCThreads, 0,                                      \
1342           "Number of parallel threads parallel gc will use")                \
1343                                                                             \
1344   product(bool, UseDynamicNumberOfGCThreads, false,                         \
1345           "Dynamically choose the number of parallel threads "              \
1346           "parallel gc will use")                                           \
1347                                                                             \
1348   diagnostic(bool, ForceDynamicNumberOfGCThreads, false,                    \
1349           "Force dynamic selection of the number of"                        \
1350           "parallel threads parallel gc will use to aid debugging")         \
1351                                                                             \
1352   product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M),               \
1353           "Size of heap (bytes) per GC thread used in calculating the "     \
1354           "number of GC threads")                                           \
1355                                                                             \
1356   product(bool, TraceDynamicGCThreads, false,                               \
1357           "Trace the dynamic GC thread usage")                              \
1358                                                                             \
1359   develop(bool, ParallelOldGCSplitALot, false,                              \
1360           "Provoke splitting (copying data from a young gen space to"       \
1361           "multiple destination spaces)")                                   \
1362                                                                             \
1363   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1364           "How often to provoke splitting a young gen space")               \
1365                                                                             \
1366   product(uintx, ConcGCThreads, 0,                                          \
1367           "Number of threads concurrent gc will use")                       \
1368                                                                             \
1369   product(uintx, YoungPLABSize, 4096,                                       \
1370           "Size of young gen promotion labs (in HeapWords)")                \
1371                                                                             \
1372   product(uintx, OldPLABSize, 1024,                                         \
1373           "Size of old gen promotion labs (in HeapWords)")                  \
1374                                                                             \
1375   product(uintx, GCTaskTimeStampEntries, 200,                               \
1376           "Number of time stamp entries per gc worker thread")              \
1377                                                                             \
1378   product(bool, AlwaysTenure, false,                                        \
1379           "Always tenure objects in eden. (ParallelGC only)")               \
1380                                                                             \
1381   product(bool, NeverTenure, false,                                         \
1382           "Never tenure objects in eden, May tenure on overflow "           \
1383           "(ParallelGC only)")                                              \
1384                                                                             \
1385   product(bool, ScavengeBeforeFullGC, true,                                 \
1386           "Scavenge youngest generation before each full GC, "              \
1387           "used with UseParallelGC")                                        \
1388                                                                             \
1389   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1390           "Allow scavenges to occur when to_space contains objects.")       \
1391                                                                             \
1392   product(bool, UseConcMarkSweepGC, false,                                  \
1393           "Use Concurrent Mark-Sweep GC in the old generation")             \
1394                                                                             \
1395   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1396           "A System.gc() request invokes a concurrent collection;"          \
1397           " (effective only when UseConcMarkSweepGC)")                      \
1398                                                                             \
1399   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1400           "A System.gc() request invokes a concurrent collection and "      \
1401           "also unloads classes during such a concurrent gc cycle "         \
1402           "(effective only when UseConcMarkSweepGC)")                       \
1403                                                                             \
1404   product(bool, GCLockerInvokesConcurrent, false,                           \
1405           "The exit of a JNI CS necessitating a scavenge also"              \
1406           " kicks off a bkgrd concurrent collection")                       \
1407                                                                             \
1408   product(uintx, GCLockerEdenExpansionPercent, 5,                           \
1409           "How much the GC can expand the eden by while the GC locker  "    \
1410           "is active (as a percentage)")                                    \
1411                                                                             \
1412   diagnostic(intx, GCLockerRetryAllocationCount, 2,                         \
1413           "Number of times to retry allocations when"                       \
1414           " blocked by the GC locker")                                      \
1415                                                                             \
1416   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1417           "Use Adaptive Free Lists in the CMS generation")                  \
1418                                                                             \
1419   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1420           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1421                                                                             \
1422   develop(bool, RotateCMSCollectionTypes, false,                            \
1423           "Rotate the CMS collections among concurrent and STW")            \
1424                                                                             \
1425   product(bool, UseCMSBestFit, true,                                        \
1426           "Use CMS best fit allocation strategy")                           \
1427                                                                             \
1428   product(bool, UseCMSCollectionPassing, true,                              \
1429           "Use passing of collection from background to foreground")        \
1430                                                                             \
1431   product(bool, UseParNewGC, false,                                         \
1432           "Use parallel threads in the new generation.")                    \
1433                                                                             \
1434   product(bool, ParallelGCVerbose, false,                                   \
1435           "Verbose output for parallel GC.")                                \
1436                                                                             \
1437   product(uintx, ParallelGCBufferWastePct, 10,                              \
1438           "Wasted fraction of parallel allocation buffer.")                 \
1439                                                                             \
1440   diagnostic(bool, ParallelGCRetainPLAB, false,                             \
1441              "Retain parallel allocation buffers across scavenges; "        \
1442              " -- disabled because this currently conflicts with "          \
1443              " parallel card scanning under certain conditions ")           \
1444                                                                             \
1445   product(uintx, TargetPLABWastePct, 10,                                    \
1446           "Target wasted space in last buffer as percent of overall "       \
1447           "allocation")                                                     \
1448                                                                             \
1449   product(uintx, PLABWeight, 75,                                            \
1450           "Percentage (0-100) used to weight the current sample when"       \
1451           "computing exponentially decaying average for ResizePLAB.")       \
1452                                                                             \
1453   product(bool, ResizePLAB, true,                                           \
1454           "Dynamically resize (survivor space) promotion labs")             \
1455                                                                             \
1456   product(bool, PrintPLAB, false,                                           \
1457           "Print (survivor space) promotion labs sizing decisions")         \
1458                                                                             \
1459   product(intx, ParGCArrayScanChunk, 50,                                    \
1460           "Scan a subset and push remainder, if array is bigger than this") \
1461                                                                             \
1462   product(bool, ParGCUseLocalOverflow, false,                               \
1463           "Instead of a global overflow list, use local overflow stacks")   \
1464                                                                             \
1465   product(bool, ParGCTrimOverflow, true,                                    \
1466           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1467                                                                             \
1468   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1469           "Whether we should simulate work queue overflow in ParNew")       \
1470                                                                             \
1471   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1472           "An `interval' counter that determines how frequently "           \
1473           "we simulate overflow; a smaller number increases frequency")     \
1474                                                                             \
1475   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1476           "The desired number of objects to claim from the overflow list")  \
1477                                                                             \
1478   diagnostic(uintx, ParGCStridesPerThread, 2,                               \
1479           "The number of strides per worker thread that we divide up the "  \
1480           "card table scanning work into")                                  \
1481                                                                             \
1482   diagnostic(intx, ParGCCardsPerStrideChunk, 256,                           \
1483           "The number of cards in each chunk of the parallel chunks used "  \
1484           "during card table scanning")                                     \
1485                                                                             \
1486   product(uintx, CMSParPromoteBlocksToClaim, 16,                            \
1487           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1488           "parallel GC.")                                                   \
1489                                                                             \
1490   product(uintx, OldPLABWeight, 50,                                         \
1491           "Percentage (0-100) used to weight the current sample when"       \
1492           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1493                                                                             \
1494   product(bool, ResizeOldPLAB, true,                                        \
1495           "Dynamically resize (old gen) promotion labs")                    \
1496                                                                             \
1497   product(bool, PrintOldPLAB, false,                                        \
1498           "Print (old gen) promotion labs sizing decisions")                \
1499                                                                             \
1500   product(uintx, CMSOldPLABMin, 16,                                         \
1501           "Min size of CMS gen promotion lab caches per worker per blksize")\
1502                                                                             \
1503   product(uintx, CMSOldPLABMax, 1024,                                       \
1504           "Max size of CMS gen promotion lab caches per worker per blksize")\
1505                                                                             \
1506   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1507           "Nominal number of refills of CMS gen promotion lab cache"        \
1508           " per worker per block size")                                     \
1509                                                                             \
1510   product(bool, CMSOldPLABResizeQuicker, false,                             \
1511           "Whether to react on-the-fly during a scavenge to a sudden"       \
1512           " change in block demand rate")                                   \
1513                                                                             \
1514   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1515           "The tolerance of the phase-change detector for on-the-fly"       \
1516           " PLAB resizing during a scavenge")                               \
1517                                                                             \
1518   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1519           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1520           " during a scavenge")                                             \
1521                                                                             \
1522   product(bool, AlwaysPreTouch, false,                                      \
1523           "It forces all freshly committed pages to be pre-touched.")       \
1524                                                                             \
1525   product_pd(uintx, CMSYoungGenPerWorker,                                   \
1526           "The maximum size of young gen chosen by default per GC worker "  \
1527           "thread available")                                               \
1528                                                                             \
1529   product(bool, CMSIncrementalMode, false,                                  \
1530           "Whether CMS GC should operate in \"incremental\" mode")          \
1531                                                                             \
1532   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1533           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1534           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1535           "value")                                                          \
1536                                                                             \
1537   product(bool, CMSIncrementalPacing, true,                                 \
1538           "Whether the CMS incremental mode duty cycle should be "          \
1539           "automatically adjusted")                                         \
1540                                                                             \
1541   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1542           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1543           "enabled (a percentage, 0-100)")                                  \
1544                                                                             \
1545   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1546           "Percentage (0-100) used to add conservatism when computing the " \
1547           "duty cycle")                                                     \
1548                                                                             \
1549   product(uintx, CMSIncrementalOffset, 0,                                   \
1550           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1551           " is shifted to the right within the period between young GCs")   \
1552                                                                             \
1553   product(uintx, CMSExpAvgFactor, 50,                                       \
1554           "Percentage (0-100) used to weight the current sample when"       \
1555           "computing exponential averages for CMS statistics.")             \
1556                                                                             \
1557   product(uintx, CMS_FLSWeight, 75,                                         \
1558           "Percentage (0-100) used to weight the current sample when"       \
1559           "computing exponentially decating averages for CMS FLS statistics.") \
1560                                                                             \
1561   product(uintx, CMS_FLSPadding, 1,                                         \
1562           "The multiple of deviation from mean to use for buffering"        \
1563           "against volatility in free list demand.")                        \
1564                                                                             \
1565   product(uintx, FLSCoalescePolicy, 2,                                      \
1566           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1567                                                                             \
1568   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1569           "CMS: Larger free blocks are always available for coalescing")    \
1570                                                                             \
1571   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1572           "CMS: the smaller the percentage the greater the coalition force")\
1573                                                                             \
1574   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1575           "CMS: the factor by which to inflate estimated demand of small"   \
1576           " block sizes to prevent coalescing with an adjoining block")     \
1577                                                                             \
1578   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1579           "CMS: the factor by which to inflate estimated demand of large"   \
1580           " block sizes to prevent coalescing with an adjoining block")     \
1581                                                                             \
1582   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1583           "CMS: the factor by which to inflate estimated demand of small"   \
1584           " block sizes to prevent splitting to supply demand for smaller"  \
1585           " blocks")                                                        \
1586                                                                             \
1587   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1588           "CMS: the factor by which to inflate estimated demand of large"   \
1589           " block sizes to prevent splitting to supply demand for smaller"  \
1590           " blocks")                                                        \
1591                                                                             \
1592   product(bool, CMSExtrapolateSweep, false,                                 \
1593           "CMS: cushion for block demand during sweep")                     \
1594                                                                             \
1595   product(uintx, CMS_SweepWeight, 75,                                       \
1596           "Percentage (0-100) used to weight the current sample when "      \
1597           "computing exponentially decaying average for inter-sweep "       \
1598           "duration")                                                       \
1599                                                                             \
1600   product(uintx, CMS_SweepPadding, 1,                                       \
1601           "The multiple of deviation from mean to use for buffering "       \
1602           "against volatility in inter-sweep duration.")                    \
1603                                                                             \
1604   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1605           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1606           "duration exceeds this threhold in milliseconds")                 \
1607                                                                             \
1608   develop(bool, CMSTraceIncrementalMode, false,                             \
1609           "Trace CMS incremental mode")                                     \
1610                                                                             \
1611   develop(bool, CMSTraceIncrementalPacing, false,                           \
1612           "Trace CMS incremental mode pacing computation")                  \
1613                                                                             \
1614   develop(bool, CMSTraceThreadState, false,                                 \
1615           "Trace the CMS thread state (enable the trace_state() method)")   \
1616                                                                             \
1617   product(bool, CMSClassUnloadingEnabled, true,                             \
1618           "Whether class unloading enabled when using CMS GC")              \
1619                                                                             \
1620   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1621           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1622           " for which classes may not be unloaded")                         \
1623                                                                             \
1624   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1625           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1626                                                                             \
1627   product(bool, UseCMSCompactAtFullCollection, true,                        \
1628           "Use mark sweep compact at full collections")                     \
1629                                                                             \
1630   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1631           "Number of CMS full collection done before compaction if > 0")    \
1632                                                                             \
1633   develop(intx, CMSDictionaryChoice, 0,                                     \
1634           "Use BinaryTreeDictionary as default in the CMS generation")      \
1635                                                                             \
1636   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1637           "Replenish an indexed free list with this number of chunks")      \
1638                                                                             \
1639   product(bool, CMSReplenishIntermediate, true,                             \
1640           "Replenish all intermediate free-list caches")                    \
1641                                                                             \
1642   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1643           "When satisfying batched demand, split blocks from the "          \
1644           "IndexedFreeList whose size is a multiple of requested size")     \
1645                                                                             \
1646   product(bool, CMSLoopWarn, false,                                         \
1647           "Warn in case of excessive CMS looping")                          \
1648                                                                             \
1649   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1650           "Whether preserved marks should be restored early")               \
1651                                                                             \
1652   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1653           "Size of marking stack")                                          \
1654                                                                             \
1655   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1656           "Max size of marking stack")                                      \
1657                                                                             \
1658   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1659           "Whether we should simulate frequent marking stack / work queue"  \
1660           " overflow")                                                      \
1661                                                                             \
1662   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1663           "An `interval' counter that determines how frequently"            \
1664           " we simulate overflow; a smaller number increases frequency")    \
1665                                                                             \
1666   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1667           "(Temporary, subject to experimentation)"                         \
1668           "Maximum number of abortable preclean iterations, if > 0")        \
1669                                                                             \
1670   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1671           "(Temporary, subject to experimentation)"                         \
1672           "Maximum time in abortable preclean in ms")                       \
1673                                                                             \
1674   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1675           "(Temporary, subject to experimentation)"                         \
1676           "Nominal minimum work per abortable preclean iteration")          \
1677                                                                             \
1678   manageable(intx, CMSAbortablePrecleanWaitMillis, 100,                     \
1679           "(Temporary, subject to experimentation)"                         \
1680           " Time that we sleep between iterations when not given"           \
1681           " enough work per iteration")                                     \
1682                                                                             \
1683   product(uintx, CMSRescanMultiple, 32,                                     \
1684           "Size (in cards) of CMS parallel rescan task")                    \
1685                                                                             \
1686   product(uintx, CMSConcMarkMultiple, 32,                                   \
1687           "Size (in cards) of CMS concurrent MT marking task")              \
1688                                                                             \
1689   product(bool, CMSAbortSemantics, false,                                   \
1690           "Whether abort-on-overflow semantics is implemented")             \
1691                                                                             \
1692   product(bool, CMSParallelRemarkEnabled, true,                             \
1693           "Whether parallel remark enabled (only if ParNewGC)")             \
1694                                                                             \
1695   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1696           "Whether parallel remark of survivor space"                       \
1697           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1698                                                                             \
1699   product(bool, CMSPLABRecordAlways, true,                                  \
1700           "Whether to always record survivor space PLAB bdries"             \
1701           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1702                                                                             \
1703   product(bool, CMSConcurrentMTEnabled, true,                               \
1704           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1705                                                                             \
1706   product(bool, CMSPrecleaningEnabled, true,                                \
1707           "Whether concurrent precleaning enabled")                         \
1708                                                                             \
1709   product(uintx, CMSPrecleanIter, 3,                                        \
1710           "Maximum number of precleaning iteration passes")                 \
1711                                                                             \
1712   product(uintx, CMSPrecleanNumerator, 2,                                   \
1713           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1714           " ratio")                                                         \
1715                                                                             \
1716   product(uintx, CMSPrecleanDenominator, 3,                                 \
1717           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1718           " ratio")                                                         \
1719                                                                             \
1720   product(bool, CMSPrecleanRefLists1, true,                                 \
1721           "Preclean ref lists during (initial) preclean phase")             \
1722                                                                             \
1723   product(bool, CMSPrecleanRefLists2, false,                                \
1724           "Preclean ref lists during abortable preclean phase")             \
1725                                                                             \
1726   product(bool, CMSPrecleanSurvivors1, false,                               \
1727           "Preclean survivors during (initial) preclean phase")             \
1728                                                                             \
1729   product(bool, CMSPrecleanSurvivors2, true,                                \
1730           "Preclean survivors during abortable preclean phase")             \
1731                                                                             \
1732   product(uintx, CMSPrecleanThreshold, 1000,                                \
1733           "Don't re-iterate if #dirty cards less than this")                \
1734                                                                             \
1735   product(bool, CMSCleanOnEnter, true,                                      \
1736           "Clean-on-enter optimization for reducing number of dirty cards") \
1737                                                                             \
1738   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1739           "Choose variant (1,2) of verification following remark")          \
1740                                                                             \
1741   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1742           "If Eden used is below this value, don't try to schedule remark") \
1743                                                                             \
1744   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1745           "The Eden occupancy % at which to try and schedule remark pause") \
1746                                                                             \
1747   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1748           "Start sampling Eden top at least before yg occupancy reaches"    \
1749           " 1/<ratio> of the size at which we plan to schedule remark")     \
1750                                                                             \
1751   product(uintx, CMSSamplingGrain, 16*K,                                    \
1752           "The minimum distance between eden samples for CMS (see above)")  \
1753                                                                             \
1754   product(bool, CMSScavengeBeforeRemark, false,                             \
1755           "Attempt scavenge before the CMS remark step")                    \
1756                                                                             \
1757   develop(bool, CMSTraceSweeper, false,                                     \
1758           "Trace some actions of the CMS sweeper")                          \
1759                                                                             \
1760   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1761           "Don't drain below this size per parallel worker/thief")          \
1762                                                                             \
1763   manageable(intx, CMSWaitDuration, 2000,                                   \
1764           "Time in milliseconds that CMS thread waits for young GC")        \
1765                                                                             \
1766   develop(uintx, CMSCheckInterval, 1000,                                    \
1767           "Interval in milliseconds that CMS thread checks if it "          \
1768           "should start a collection cycle")                                \
1769                                                                             \
1770   product(bool, CMSYield, true,                                             \
1771           "Yield between steps of concurrent mark & sweep")                 \
1772                                                                             \
1773   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1774           "Bitmap operations should process at most this many bits"         \
1775           "between yields")                                                 \
1776                                                                             \
1777   product(bool, CMSDumpAtPromotionFailure, false,                           \
1778           "Dump useful information about the state of the CMS old "         \
1779           " generation upon a promotion failure.")                          \
1780                                                                             \
1781   product(bool, CMSPrintChunksInDump, false,                                \
1782           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1783           " more detailed information about the free chunks.")              \
1784                                                                             \
1785   product(bool, CMSPrintObjectsInDump, false,                               \
1786           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1787           " more detailed information about the allocated objects.")        \
1788                                                                             \
1789   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1790           "Verify that all refs across the FLS boundary "                   \
1791           " are to valid objects")                                          \
1792                                                                             \
1793   diagnostic(bool, FLSVerifyLists, false,                                   \
1794           "Do lots of (expensive) FreeListSpace verification")              \
1795                                                                             \
1796   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1797           "Do lots of (expensive) FLS index table verification")            \
1798                                                                             \
1799   develop(bool, FLSVerifyDictionary, false,                                 \
1800           "Do lots of (expensive) FLS dictionary verification")             \
1801                                                                             \
1802   develop(bool, VerifyBlockOffsetArray, false,                              \
1803           "Do (expensive!) block offset array verification")                \
1804                                                                             \
1805   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1806           "Maintain _unallocated_block in BlockOffsetArray"                 \
1807           " (currently applicable only to CMS collector)")                  \
1808                                                                             \
1809   develop(bool, TraceCMSState, false,                                       \
1810           "Trace the state of the CMS collection")                          \
1811                                                                             \
1812   product(intx, RefDiscoveryPolicy, 0,                                      \
1813           "Whether reference-based(0) or referent-based(1)")                \
1814                                                                             \
1815   product(bool, ParallelRefProcEnabled, false,                              \
1816           "Enable parallel reference processing whenever possible")         \
1817                                                                             \
1818   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1819           "Enable balancing of reference processing queues")                \
1820                                                                             \
1821   product(uintx, CMSTriggerRatio, 80,                                       \
1822           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1823           "allocated before a CMS collection cycle commences")              \
1824                                                                             \
1825   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1826           "Percentage CMS generation occupancy at which to "                \
1827           "initiate CMS collection for bootstrapping collection stats")     \
1828                                                                             \
1829   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1830           "Percentage CMS generation occupancy to start a CMS collection "  \
1831           "cycle. A negative value means that CMSTriggerRatio is used")     \
1832                                                                             \
1833   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1834           "Percentage of the (entire) heap occupancy to start a "           \
1835           "concurrent GC cycle. It is used by GCs that trigger a "          \
1836           "concurrent GC cycle based on the occupancy of the entire heap, " \
1837           "not just one of the generations (e.g., G1). A value of 0 "       \
1838           "denotes 'do constant GC cycles'.")                               \
1839                                                                             \
1840   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1841           "Only use occupancy as a crierion for starting a CMS collection") \
1842                                                                             \
1843   product(uintx, CMSIsTooFullPercentage, 98,                                \
1844           "An absolute ceiling above which CMS will always consider the "   \
1845           "unloading of classes when class unloading is enabled")           \
1846                                                                             \
1847   develop(bool, CMSTestInFreeList, false,                                   \
1848           "Check if the coalesced range is already in the "                 \
1849           "free lists as claimed")                                          \
1850                                                                             \
1851   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1852           "Check that all the garbage collected was returned to the "       \
1853           "free lists.")                                                    \
1854                                                                             \
1855   notproduct(bool, ScavengeALot, false,                                     \
1856           "Force scavenge at every Nth exit from the runtime system "       \
1857           "(N=ScavengeALotInterval)")                                       \
1858                                                                             \
1859   develop(bool, FullGCALot, false,                                          \
1860           "Force full gc at every Nth exit from the runtime system "        \
1861           "(N=FullGCALotInterval)")                                         \
1862                                                                             \
1863   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1864           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1865                                                                             \
1866   product(bool, PrintPromotionFailure, false,                               \
1867           "Print additional diagnostic information following "              \
1868           " promotion failure")                                             \
1869                                                                             \
1870   notproduct(bool, PromotionFailureALot, false,                             \
1871           "Use promotion failure handling on every youngest generation "    \
1872           "collection")                                                     \
1873                                                                             \
1874   develop(uintx, PromotionFailureALotCount, 1000,                           \
1875           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1876           "refill attempts (ParNew) or promotion attempts "                 \
1877           "(other young collectors) ")                                      \
1878                                                                             \
1879   develop(uintx, PromotionFailureALotInterval, 5,                           \
1880           "Total collections between promotion failures alot")              \
1881                                                                             \
1882   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1883           "Sleep time when sleep is used for yields")                       \
1884                                                                             \
1885   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1886           "Number of yields before a sleep is done during workstealing")    \
1887                                                                             \
1888   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1889           "Number of iterations in a spin loop between checks on "          \
1890           "time out of hard spin")                                          \
1891                                                                             \
1892   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1893           "Ratio of hard spins to calls to yield")                          \
1894                                                                             \
1895   develop(uintx, ObjArrayMarkingStride, 512,                                \
1896           "Number of ObjArray elements to push onto the marking stack"      \
1897           "before pushing a continuation entry")                            \
1898                                                                             \
1899   develop(bool, MetadataAllocationFailALot, false,                          \
1900           "Fail metadata allocations at intervals controlled by "           \
1901           "MetadataAllocationFailALotInterval")                             \
1902                                                                             \
1903   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1904           "metadata allocation failure alot interval")                      \
1905                                                                             \
1906   develop(bool, MetaDataDeallocateALot, false,                              \
1907           "Deallocation bunches of metadata at intervals controlled by "    \
1908           "MetaDataAllocateALotInterval")                                   \
1909                                                                             \
1910   develop(uintx, MetaDataDeallocateALotInterval, 100,                       \
1911           "Metadata deallocation alot interval")                            \
1912                                                                             \
1913   develop(bool, TraceMetadataChunkAllocation, false,                        \
1914           "Trace chunk metadata allocations")                               \
1915                                                                             \
1916   product(bool, TraceMetadataHumongousAllocation, false,                    \
1917           "Trace humongous metadata allocations")                           \
1918                                                                             \
1919   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1920           "Trace virtual space metadata allocations")                       \
1921                                                                             \
1922   notproduct(bool, ExecuteInternalVMTests, false,                           \
1923           "Enable execution of internal VM tests.")                         \
1924                                                                             \
1925   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1926                                                                             \
1927   product_pd(bool, ResizeTLAB,                                              \
1928           "Dynamically resize tlab size for threads")                       \
1929                                                                             \
1930   product(bool, ZeroTLAB, false,                                            \
1931           "Zero out the newly created TLAB")                                \
1932                                                                             \
1933   product(bool, FastTLABRefill, true,                                       \
1934           "Use fast TLAB refill code")                                      \
1935                                                                             \
1936   product(bool, PrintTLAB, false,                                           \
1937           "Print various TLAB related information")                         \
1938                                                                             \
1939   product(bool, TLABStats, true,                                            \
1940           "Print various TLAB related information")                         \
1941                                                                             \
1942   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
1943           "Enable LowMemoryProtection"))                                    \
1944                                                                             \
1945   product_pd(bool, NeverActAsServerClassMachine,                            \
1946           "Never act like a server-class machine")                          \
1947                                                                             \
1948   product(bool, AlwaysActAsServerClassMachine, false,                       \
1949           "Always act like a server-class machine")                         \
1950                                                                             \
1951   product_pd(uint64_t, MaxRAM,                                              \
1952           "Real memory size (in bytes) used to set maximum heap size")      \
1953                                                                             \
1954   product(uintx, ErgoHeapSizeLimit, 0,                                      \
1955           "Maximum ergonomically set heap size (in bytes); zero means use " \
1956           "MaxRAM / MaxRAMFraction")                                        \
1957                                                                             \
1958   product(uintx, MaxRAMFraction, 4,                                         \
1959           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1960           "size")                                                           \
1961                                                                             \
1962   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1963           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1964           "size; deprecated: to be renamed to MaxRAMFraction")              \
1965                                                                             \
1966   product(uintx, MinRAMFraction, 2,                                         \
1967           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
1968           "size on systems with small physical memory size")                \
1969                                                                             \
1970   product(uintx, InitialRAMFraction, 64,                                    \
1971           "Fraction (1/n) of real memory used for initial heap size")       \
1972                                                                             \
1973   develop(uintx, MaxVirtMemFraction, 2,                                     \
1974           "Maximum fraction (1/n) of virtual memory used for ergonomically" \
1975           "determining maximum heap size")                                  \
1976                                                                             \
1977   product(bool, UseAutoGCSelectPolicy, false,                               \
1978           "Use automatic collection selection policy")                      \
1979                                                                             \
1980   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1981           "Automatic GC selection pause threshhold in ms")                  \
1982                                                                             \
1983   product(bool, UseAdaptiveSizePolicy, true,                                \
1984           "Use adaptive generation sizing policies")                        \
1985                                                                             \
1986   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1987           "Use adaptive survivor sizing policies")                          \
1988                                                                             \
1989   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1990           "Use adaptive young-old sizing policies at minor collections")    \
1991                                                                             \
1992   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1993           "Use adaptive young-old sizing policies at major collections")    \
1994                                                                             \
1995   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1996           "Use statistics from System.GC for adaptive size policy")         \
1997                                                                             \
1998   product(bool, UseAdaptiveGCBoundary, false,                               \
1999           "Allow young-old boundary to move")                               \
2000                                                                             \
2001   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2002           "Trace young-old boundary moves")                                 \
2003                                                                             \
2004   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2005           "Resize the virtual spaces of the young or old generations")      \
2006                                                                             \
2007   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2008           "Policy for changeing generation size for throughput goals")      \
2009                                                                             \
2010   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2011           "Policy for changing generation size for pause goals")            \
2012                                                                             \
2013   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2014           "Adjust tenured generation to achive a minor pause goal")         \
2015                                                                             \
2016   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2017           "Adjust young generation to achive a major pause goal")           \
2018                                                                             \
2019   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2020           "Number of steps where heuristics is used before data is used")   \
2021                                                                             \
2022   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2023           "Number of collections before the adaptive sizing is started")    \
2024                                                                             \
2025   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2026           "Collection interval for printing information; zero means never") \
2027                                                                             \
2028   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2029           "Use adaptive minimum footprint as a goal")                       \
2030                                                                             \
2031   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2032           "Weight given to exponential resizing, between 0 and 100")        \
2033                                                                             \
2034   product(uintx, AdaptiveTimeWeight,       25,                              \
2035           "Weight given to time in adaptive policy, between 0 and 100")     \
2036                                                                             \
2037   product(uintx, PausePadding, 1,                                           \
2038           "How much buffer to keep for pause time")                         \
2039                                                                             \
2040   product(uintx, PromotedPadding, 3,                                        \
2041           "How much buffer to keep for promotion failure")                  \
2042                                                                             \
2043   product(uintx, SurvivorPadding, 3,                                        \
2044           "How much buffer to keep for survivor overflow")                  \
2045                                                                             \
2046   product(uintx, ThresholdTolerance, 10,                                    \
2047           "Allowed collection cost difference between generations")         \
2048                                                                             \
2049   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2050           "If collection costs are within margin, reduce both by full "     \
2051           "delta")                                                          \
2052                                                                             \
2053   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2054           "Adaptive size percentage change in young generation")            \
2055                                                                             \
2056   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2057           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2058                                                                             \
2059   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2060           "Decay factor to YoungedGenerationSizeSupplement")                \
2061                                                                             \
2062   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2063           "Adaptive size percentage change in tenured generation")          \
2064                                                                             \
2065   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2066           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2067                                                                             \
2068   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2069           "Decay factor to TenuredGenerationSizeIncrement")                 \
2070                                                                             \
2071   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2072           "Adaptive size policy maximum GC pause time goal in msec, "       \
2073           "or (G1 Only) the max. GC time per MMU time slice")               \
2074                                                                             \
2075   product(uintx, GCPauseIntervalMillis, 0,                                  \
2076           "Time slice for MMU specification")                               \
2077                                                                             \
2078   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2079           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2080                                                                             \
2081   product(uintx, GCTimeRatio, 99,                                           \
2082           "Adaptive size policy application time to GC time ratio")         \
2083                                                                             \
2084   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2085           "Adaptive size scale down factor for shrinking")                  \
2086                                                                             \
2087   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2088           "Adaptive size decays the major cost for long major intervals")   \
2089                                                                             \
2090   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2091           "Time scale over which major costs decay")                        \
2092                                                                             \
2093   product(uintx, MinSurvivorRatio, 3,                                       \
2094           "Minimum ratio of young generation/survivor space size")          \
2095                                                                             \
2096   product(uintx, InitialSurvivorRatio, 8,                                   \
2097           "Initial ratio of eden/survivor space size")                      \
2098                                                                             \
2099   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2100           "Estimate of footprint other than Java Heap")                     \
2101                                                                             \
2102   product(bool, UseGCOverheadLimit, true,                                   \
2103           "Use policy to limit of proportion of time spent in GC "          \
2104           "before an OutOfMemory error is thrown")                          \
2105                                                                             \
2106   product(uintx, GCTimeLimit, 98,                                           \
2107           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2108           "error is thrown (used with GCHeapFreeLimit)")                    \
2109                                                                             \
2110   product(uintx, GCHeapFreeLimit, 2,                                        \
2111           "Minimum percentage of free space after a full GC before an "     \
2112           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2113                                                                             \
2114   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2115           "Number of consecutive collections before gc time limit fires")   \
2116                                                                             \
2117   product(bool, PrintAdaptiveSizePolicy, false,                             \
2118           "Print information about AdaptiveSizePolicy")                     \
2119                                                                             \
2120   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2121           "How far ahead to prefetch destination area (<= 0 means off)")    \
2122                                                                             \
2123   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2124           "How far ahead to prefetch scan area (<= 0 means off)")           \
2125                                                                             \
2126   product(intx, PrefetchFieldsAhead, -1,                                    \
2127           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2128                                                                             \
2129   diagnostic(bool, VerifySilently, false,                                   \
2130           "Don't print print the verification progress")                    \
2131                                                                             \
2132   diagnostic(bool, VerifyDuringStartup, false,                              \
2133           "Verify memory system before executing any Java code "            \
2134           "during VM initialization")                                       \
2135                                                                             \
2136   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2137           "Verify system before exiting")                                   \
2138                                                                             \
2139   diagnostic(bool, VerifyBeforeGC, false,                                   \
2140           "Verify memory system before GC")                                 \
2141                                                                             \
2142   diagnostic(bool, VerifyAfterGC, false,                                    \
2143           "Verify memory system after GC")                                  \
2144                                                                             \
2145   diagnostic(bool, VerifyDuringGC, false,                                   \
2146           "Verify memory system during GC (between phases)")                \
2147                                                                             \
2148   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2149           "Enable parallel memory system verification")                     \
2150                                                                             \
2151   diagnostic(bool, DeferInitialCardMark, false,                             \
2152           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2153            "may arise from new_pre_store_barrier")                          \
2154                                                                             \
2155   diagnostic(bool, VerifyRememberedSets, false,                             \
2156           "Verify GC remembered sets")                                      \
2157                                                                             \
2158   diagnostic(bool, VerifyObjectStartArray, true,                            \
2159           "Verify GC object start array if verify before/after")            \
2160                                                                             \
2161   product(bool, DisableExplicitGC, false,                                   \
2162           "Tells whether calling System.gc() does a full GC")               \
2163                                                                             \
2164   notproduct(bool, CheckMemoryInitialization, false,                        \
2165           "Checks memory initialization")                                   \
2166                                                                             \
2167   product(bool, CollectGen0First, false,                                    \
2168           "Collect youngest generation before each full GC")                \
2169                                                                             \
2170   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2171           "Bind CMS Thread to CPU if possible")                             \
2172                                                                             \
2173   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2174           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2175                                                                             \
2176   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2177           "Bind GCTaskThreads to CPUs if possible")                         \
2178                                                                             \
2179   product(bool, UseGCTaskAffinity, false,                                   \
2180           "Use worker affinity when asking for GCTasks")                    \
2181                                                                             \
2182   product(uintx, ProcessDistributionStride, 4,                              \
2183           "Stride through processors when distributing processes")          \
2184                                                                             \
2185   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2186           "number of times the coordinator GC thread will sleep while "     \
2187           "yielding before giving up and resuming GC")                      \
2188                                                                             \
2189   product(uintx, CMSYieldSleepCount, 0,                                     \
2190           "number of times a GC thread (minus the coordinator) "            \
2191           "will sleep while yielding before giving up and resuming GC")     \
2192                                                                             \
2193   /* gc tracing */                                                          \
2194   manageable(bool, PrintGC, false,                                          \
2195           "Print message at garbage collect")                               \
2196                                                                             \
2197   manageable(bool, PrintGCDetails, false,                                   \
2198           "Print more details at garbage collect")                          \
2199                                                                             \
2200   manageable(bool, PrintGCDateStamps, false,                                \
2201           "Print date stamps at garbage collect")                           \
2202                                                                             \
2203   manageable(bool, PrintGCTimeStamps, false,                                \
2204           "Print timestamps at garbage collect")                            \
2205                                                                             \
2206   product(bool, PrintGCTaskTimeStamps, false,                               \
2207           "Print timestamps for individual gc worker thread tasks")         \
2208                                                                             \
2209   develop(intx, ConcGCYieldTimeout, 0,                                      \
2210           "If non-zero, assert that GC threads yield within this # of ms.") \
2211                                                                             \
2212   notproduct(bool, TraceMarkSweep, false,                                   \
2213           "Trace mark sweep")                                               \
2214                                                                             \
2215   product(bool, PrintReferenceGC, false,                                    \
2216           "Print times spent handling reference objects during GC "         \
2217           " (enabled only when PrintGCDetails)")                            \
2218                                                                             \
2219   develop(bool, TraceReferenceGC, false,                                    \
2220           "Trace handling of soft/weak/final/phantom references")           \
2221                                                                             \
2222   develop(bool, TraceFinalizerRegistration, false,                          \
2223          "Trace registration of final references")                          \
2224                                                                             \
2225   notproduct(bool, TraceScavenge, false,                                    \
2226           "Trace scavenge")                                                 \
2227                                                                             \
2228   product_rw(bool, TraceClassLoading, false,                                \
2229           "Trace all classes loaded")                                       \
2230                                                                             \
2231   product(bool, TraceClassLoadingPreorder, false,                           \
2232           "Trace all classes loaded in order referenced (not loaded)")      \
2233                                                                             \
2234   product_rw(bool, TraceClassUnloading, false,                              \
2235           "Trace unloading of classes")                                     \
2236                                                                             \
2237   product_rw(bool, TraceLoaderConstraints, false,                           \
2238           "Trace loader constraints")                                       \
2239                                                                             \
2240   develop(bool, TraceClassLoaderData, false,                                \
2241           "Trace class loader loader_data lifetime")                        \
2242                                                                             \
2243   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2244           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2245           "Initial size of the boot class loader data metaspace")           \
2246                                                                             \
2247   product(bool, TraceGen0Time, false,                                       \
2248           "Trace accumulated time for Gen 0 collection")                    \
2249                                                                             \
2250   product(bool, TraceGen1Time, false,                                       \
2251           "Trace accumulated time for Gen 1 collection")                    \
2252                                                                             \
2253   product(bool, PrintTenuringDistribution, false,                           \
2254           "Print tenuring age information")                                 \
2255                                                                             \
2256   product_rw(bool, PrintHeapAtGC, false,                                    \
2257           "Print heap layout before and after each GC")                     \
2258                                                                             \
2259   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2260           "Prints extended information about the layout of the heap "       \
2261           "when -XX:+PrintHeapAtGC is set")                                 \
2262                                                                             \
2263   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2264           "Print heap layout in response to SIGBREAK")                      \
2265                                                                             \
2266   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2267           "Print a class histogram before any major stop-world GC")         \
2268                                                                             \
2269   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2270           "Print a class histogram after any major stop-world GC")          \
2271                                                                             \
2272   manageable(bool, PrintClassHistogram, false,                              \
2273           "Print a histogram of class instances")                           \
2274                                                                             \
2275   develop(bool, TraceWorkGang, false,                                       \
2276           "Trace activities of work gangs")                                 \
2277                                                                             \
2278   product(bool, TraceParallelOldGCTasks, false,                             \
2279           "Trace multithreaded GC activity")                                \
2280                                                                             \
2281   develop(bool, TraceBlockOffsetTable, false,                               \
2282           "Print BlockOffsetTable maps")                                    \
2283                                                                             \
2284   develop(bool, TraceCardTableModRefBS, false,                              \
2285           "Print CardTableModRefBS maps")                                   \
2286                                                                             \
2287   develop(bool, TraceGCTaskManager, false,                                  \
2288           "Trace actions of the GC task manager")                           \
2289                                                                             \
2290   develop(bool, TraceGCTaskQueue, false,                                    \
2291           "Trace actions of the GC task queues")                            \
2292                                                                             \
2293   diagnostic(bool, TraceGCTaskThread, false,                                \
2294           "Trace actions of the GC task threads")                           \
2295                                                                             \
2296   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2297           "Print the time taken by each parallel old gc phase."             \
2298           "PrintGCDetails must also be enabled.")                           \
2299                                                                             \
2300   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2301           "Trace parallel old gc marking phase")                            \
2302                                                                             \
2303   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2304           "Trace parallel old gc summary phase")                            \
2305                                                                             \
2306   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2307           "Trace parallel old gc compaction phase")                         \
2308                                                                             \
2309   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2310           "Trace parallel old gc dense prefix computation")                 \
2311                                                                             \
2312   develop(bool, IgnoreLibthreadGPFault, false,                              \
2313           "Suppress workaround for libthread GP fault")                     \
2314                                                                             \
2315   product(bool, PrintJNIGCStalls, false,                                    \
2316           "Print diagnostic message when GC is stalled"                     \
2317           "by JNI critical section")                                        \
2318                                                                             \
2319   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2320           "The percentage of the used heap that the instances of a class "  \
2321           "must occupy for the class to generate a trace event.")           \
2322                                                                             \
2323   /* GC log rotation setting */                                             \
2324                                                                             \
2325   product(bool, UseGCLogFileRotation, false,                                \
2326           "Prevent large gclog file for long running app. "                 \
2327           "Requires -Xloggc:<filename>")                                    \
2328                                                                             \
2329   product(uintx, NumberOfGCLogFiles, 0,                                     \
2330           "Number of gclog files in rotation, "                             \
2331           "Default: 0, no rotation")                                        \
2332                                                                             \
2333   product(uintx, GCLogFileSize, 0,                                          \
2334           "GC log file size, Default: 0 bytes, no rotation "                \
2335           "Only valid with UseGCLogFileRotation")                           \
2336                                                                             \
2337   /* JVMTI heap profiling */                                                \
2338                                                                             \
2339   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2340           "Trace JVMTI object tagging calls")                               \
2341                                                                             \
2342   diagnostic(bool, VerifyBeforeIteration, false,                            \
2343           "Verify memory system before JVMTI iteration")                    \
2344                                                                             \
2345   /* compiler interface */                                                  \
2346                                                                             \
2347   develop(bool, CIPrintCompilerName, false,                                 \
2348           "when CIPrint is active, print the name of the active compiler")  \
2349                                                                             \
2350   develop(bool, CIPrintCompileQueue, false,                                 \
2351           "display the contents of the compile queue whenever a "           \
2352           "compilation is enqueued")                                        \
2353                                                                             \
2354   develop(bool, CIPrintRequests, false,                                     \
2355           "display every request for compilation")                          \
2356                                                                             \
2357   product(bool, CITime, false,                                              \
2358           "collect timing information for compilation")                     \
2359                                                                             \
2360   develop(bool, CITimeEach, false,                                          \
2361           "display timing information after each successful compilation")   \
2362                                                                             \
2363   develop(bool, CICountOSR, false,                                          \
2364           "use a separate counter when assigning ids to osr compilations")  \
2365                                                                             \
2366   develop(bool, CICompileNatives, true,                                     \
2367           "compile native methods if supported by the compiler")            \
2368                                                                             \
2369   develop_pd(bool, CICompileOSR,                                            \
2370           "compile on stack replacement methods if supported by the "       \
2371           "compiler")                                                       \
2372                                                                             \
2373   develop(bool, CIPrintMethodCodes, false,                                  \
2374           "print method bytecodes of the compiled code")                    \
2375                                                                             \
2376   develop(bool, CIPrintTypeFlow, false,                                     \
2377           "print the results of ciTypeFlow analysis")                       \
2378                                                                             \
2379   develop(bool, CITraceTypeFlow, false,                                     \
2380           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2381                                                                             \
2382   develop(intx, OSROnlyBCI, -1,                                             \
2383           "OSR only at this bci.  Negative values mean exclude that bci")   \
2384                                                                             \
2385   /* compiler */                                                            \
2386                                                                             \
2387   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2388           "Number of compiler threads to run")                              \
2389                                                                             \
2390   product(intx, CompilationPolicyChoice, 0,                                 \
2391           "which compilation policy (0/1)")                                 \
2392                                                                             \
2393   develop(bool, UseStackBanging, true,                                      \
2394           "use stack banging for stack overflow checks (required for "      \
2395           "proper StackOverflow handling; disable only to measure cost "    \
2396           "of stackbanging)")                                               \
2397                                                                             \
2398   develop(bool, UseStrictFP, true,                                          \
2399           "use strict fp if modifier strictfp is set")                      \
2400                                                                             \
2401   develop(bool, GenerateSynchronizationCode, true,                          \
2402           "generate locking/unlocking code for synchronized methods and "   \
2403           "monitors")                                                       \
2404                                                                             \
2405   develop(bool, GenerateCompilerNullChecks, true,                           \
2406           "Generate explicit null checks for loads/stores/calls")           \
2407                                                                             \
2408   develop(bool, GenerateRangeChecks, true,                                  \
2409           "Generate range checks for array accesses")                       \
2410                                                                             \
2411   develop_pd(bool, ImplicitNullChecks,                                      \
2412           "generate code for implicit null checks")                         \
2413                                                                             \
2414   product(bool, PrintSafepointStatistics, false,                            \
2415           "print statistics about safepoint synchronization")               \
2416                                                                             \
2417   product(intx, PrintSafepointStatisticsCount, 300,                         \
2418           "total number of safepoint statistics collected "                 \
2419           "before printing them out")                                       \
2420                                                                             \
2421   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2422           "print safepoint statistics only when safepoint takes"            \
2423           " more than PrintSafepointSatisticsTimeout in millis")            \
2424                                                                             \
2425   product(bool, TraceSafepointCleanupTime, false,                           \
2426           "print the break down of clean up tasks performed during"         \
2427           " safepoint")                                                     \
2428                                                                             \
2429   product(bool, Inline, true,                                               \
2430           "enable inlining")                                                \
2431                                                                             \
2432   product(bool, ClipInlining, true,                                         \
2433           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2434                                                                             \
2435   develop(bool, UseCHA, true,                                               \
2436           "enable CHA")                                                     \
2437                                                                             \
2438   product(bool, UseTypeProfile, true,                                       \
2439           "Check interpreter profile for historically monomorphic calls")   \
2440                                                                             \
2441   notproduct(bool, TimeCompiler, false,                                     \
2442           "time the compiler")                                              \
2443                                                                             \
2444   diagnostic(bool, PrintInlining, false,                                    \
2445           "prints inlining optimizations")                                  \
2446                                                                             \
2447   product(bool, UsePopCountInstruction, false,                              \
2448           "Use population count instruction")                               \
2449                                                                             \
2450   develop(bool, EagerInitialization, false,                                 \
2451           "Eagerly initialize classes if possible")                         \
2452                                                                             \
2453   develop(bool, TraceMethodReplacement, false,                              \
2454           "Print when methods are replaced do to recompilation")            \
2455                                                                             \
2456   develop(bool, PrintMethodFlushing, false,                                 \
2457           "print the nmethods being flushed")                               \
2458                                                                             \
2459   develop(bool, UseRelocIndex, false,                                       \
2460          "use an index to speed random access to relocations")              \
2461                                                                             \
2462   develop(bool, StressCodeBuffers, false,                                   \
2463          "Exercise code buffer expansion and other rare state changes")     \
2464                                                                             \
2465   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2466          "Generate extra debugging info for non-safepoints in nmethods")    \
2467                                                                             \
2468   product(bool, PrintVMOptions, false,                                      \
2469          "Print flags that appeared on the command line")                   \
2470                                                                             \
2471   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2472          "Ignore unrecognized VM options")                                  \
2473                                                                             \
2474   product(bool, PrintCommandLineFlags, false,                               \
2475          "Print flags specified on command line or set by ergonomics")      \
2476                                                                             \
2477   product(bool, PrintFlagsInitial, false,                                   \
2478          "Print all VM flags before argument processing and exit VM")       \
2479                                                                             \
2480   product(bool, PrintFlagsFinal, false,                                     \
2481          "Print all VM flags after argument and ergonomic processing")      \
2482                                                                             \
2483   notproduct(bool, PrintFlagsWithComments, false,                           \
2484          "Print all VM flags with default values and descriptions and exit")\
2485                                                                             \
2486   diagnostic(bool, SerializeVMOutput, true,                                 \
2487          "Use a mutex to serialize output to tty and hotspot.log")          \
2488                                                                             \
2489   diagnostic(bool, DisplayVMOutput, true,                                   \
2490          "Display all VM output on the tty, independently of LogVMOutput")  \
2491                                                                             \
2492   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2493          "Save VM output to hotspot.log, or to LogFile")                    \
2494                                                                             \
2495   diagnostic(ccstr, LogFile, NULL,                                          \
2496          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2497                                                                             \
2498   product(ccstr, ErrorFile, NULL,                                           \
2499          "If an error occurs, save the error data to this file "            \
2500          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2501                                                                             \
2502   product(bool, DisplayVMOutputToStderr, false,                             \
2503          "If DisplayVMOutput is true, display all VM output to stderr")     \
2504                                                                             \
2505   product(bool, DisplayVMOutputToStdout, false,                             \
2506          "If DisplayVMOutput is true, display all VM output to stdout")     \
2507                                                                             \
2508   product(bool, UseHeavyMonitors, false,                                    \
2509           "use heavyweight instead of lightweight Java monitors")           \
2510                                                                             \
2511   product(bool, PrintStringTableStatistics, false,                          \
2512           "print statistics about the StringTable and SymbolTable")         \
2513                                                                             \
2514   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2515           "print histogram of the symbol table")                            \
2516                                                                             \
2517   notproduct(bool, ExitVMOnVerifyError, false,                              \
2518           "standard exit from VM if bytecode verify error "                 \
2519           "(only in debug mode)")                                           \
2520                                                                             \
2521   notproduct(ccstr, AbortVMOnException, NULL,                               \
2522           "Call fatal if this exception is thrown.  Example: "              \
2523           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2524                                                                             \
2525   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2526           "Call fatal if the exception pointed by AbortVMOnException "      \
2527           "has this message.")                                              \
2528                                                                             \
2529   develop(bool, DebugVtables, false,                                        \
2530           "add debugging code to vtable dispatch")                          \
2531                                                                             \
2532   develop(bool, PrintVtables, false,                                        \
2533           "print vtables when printing klass")                              \
2534                                                                             \
2535   notproduct(bool, PrintVtableStats, false,                                 \
2536           "print vtables stats at end of run")                              \
2537                                                                             \
2538   develop(bool, TraceCreateZombies, false,                                  \
2539           "trace creation of zombie nmethods")                              \
2540                                                                             \
2541   notproduct(bool, IgnoreLockingAssertions, false,                          \
2542           "disable locking assertions (for speed)")                         \
2543                                                                             \
2544   product(bool, RangeCheckElimination, true,                                \
2545           "Eliminate range checks")                                         \
2546                                                                             \
2547   develop_pd(bool, UncommonNullCast,                                        \
2548           "track occurrences of null in casts; adjust compiler tactics")    \
2549                                                                             \
2550   develop(bool, TypeProfileCasts,  true,                                    \
2551           "treat casts like calls for purposes of type profiling")          \
2552                                                                             \
2553   develop(bool, DelayCompilationDuringStartup, true,                        \
2554           "Delay invoking the compiler until main application class is "    \
2555           "loaded")                                                         \
2556                                                                             \
2557   develop(bool, CompileTheWorld, false,                                     \
2558           "Compile all methods in all classes in bootstrap class path "     \
2559           "(stress test)")                                                  \
2560                                                                             \
2561   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2562           "Preload all classes used by a class before start loading")       \
2563                                                                             \
2564   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2565           "Force a safepoint every n compiles so sweeper can keep up")      \
2566                                                                             \
2567   develop(bool, FillDelaySlots, true,                                       \
2568           "Fill delay slots (on SPARC only)")                               \
2569                                                                             \
2570   develop(bool, TimeLivenessAnalysis, false,                                \
2571           "Time computation of bytecode liveness analysis")                 \
2572                                                                             \
2573   develop(bool, TraceLivenessGen, false,                                    \
2574           "Trace the generation of liveness analysis information")          \
2575                                                                             \
2576   notproduct(bool, TraceLivenessQuery, false,                               \
2577           "Trace queries of liveness analysis information")                 \
2578                                                                             \
2579   notproduct(bool, CollectIndexSetStatistics, false,                        \
2580           "Collect information about IndexSets")                            \
2581                                                                             \
2582   develop(bool, UseLoopSafepoints, true,                                    \
2583           "Generate Safepoint nodes in every loop")                         \
2584                                                                             \
2585   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2586           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2587           "Inline allocations larger than this in doublewords must go slow")\
2588                                                                             \
2589   product(bool, AggressiveOpts, false,                                      \
2590           "Enable aggressive optimizations - see arguments.cpp")            \
2591                                                                             \
2592   product(bool, UseStringCache, false,                                      \
2593           "Enable String cache capabilities on String.java")                \
2594                                                                             \
2595   /* statistics */                                                          \
2596   develop(bool, CountCompiledCalls, false,                                  \
2597           "counts method invocations")                                      \
2598                                                                             \
2599   notproduct(bool, CountRuntimeCalls, false,                                \
2600           "counts VM runtime calls")                                        \
2601                                                                             \
2602   develop(bool, CountJNICalls, false,                                       \
2603           "counts jni method invocations")                                  \
2604                                                                             \
2605   notproduct(bool, CountJVMCalls, false,                                    \
2606           "counts jvm method invocations")                                  \
2607                                                                             \
2608   notproduct(bool, CountRemovableExceptions, false,                         \
2609           "count exceptions that could be replaced by branches due to "     \
2610           "inlining")                                                       \
2611                                                                             \
2612   notproduct(bool, ICMissHistogram, false,                                  \
2613           "produce histogram of IC misses")                                 \
2614                                                                             \
2615   notproduct(bool, PrintClassStatistics, false,                             \
2616           "prints class statistics at end of run")                          \
2617                                                                             \
2618   notproduct(bool, PrintMethodStatistics, false,                            \
2619           "prints method statistics at end of run")                         \
2620                                                                             \
2621   /* interpreter */                                                         \
2622   develop(bool, ClearInterpreterLocals, false,                              \
2623           "Always clear local variables of interpreter activations upon "   \
2624           "entry")                                                          \
2625                                                                             \
2626   product_pd(bool, RewriteBytecodes,                                        \
2627           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2628                                                                             \
2629   product_pd(bool, RewriteFrequentPairs,                                    \
2630           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2631                                                                             \
2632   diagnostic(bool, PrintInterpreter, false,                                 \
2633           "Prints the generated interpreter code")                          \
2634                                                                             \
2635   product(bool, UseInterpreter, true,                                       \
2636           "Use interpreter for non-compiled methods")                       \
2637                                                                             \
2638   develop(bool, UseFastSignatureHandlers, true,                             \
2639           "Use fast signature handlers for native calls")                   \
2640                                                                             \
2641   product(bool, UseLoopCounter, true,                                       \
2642           "Increment invocation counter on backward branch")                \
2643                                                                             \
2644   product(bool, UseFastEmptyMethods, true,                                  \
2645           "Use fast method entry code for empty methods")                   \
2646                                                                             \
2647   product(bool, UseFastAccessorMethods, true,                               \
2648           "Use fast method entry code for accessor methods")                \
2649                                                                             \
2650   product_pd(bool, UseOnStackReplacement,                                   \
2651            "Use on stack replacement, calls runtime if invoc. counter "     \
2652            "overflows in loop")                                             \
2653                                                                             \
2654   notproduct(bool, TraceOnStackReplacement, false,                          \
2655           "Trace on stack replacement")                                     \
2656                                                                             \
2657   product_pd(bool, PreferInterpreterNativeStubs,                            \
2658           "Use always interpreter stubs for native methods invoked via "    \
2659           "interpreter")                                                    \
2660                                                                             \
2661   develop(bool, CountBytecodes, false,                                      \
2662           "Count number of bytecodes executed")                             \
2663                                                                             \
2664   develop(bool, PrintBytecodeHistogram, false,                              \
2665           "Print histogram of the executed bytecodes")                      \
2666                                                                             \
2667   develop(bool, PrintBytecodePairHistogram, false,                          \
2668           "Print histogram of the executed bytecode pairs")                 \
2669                                                                             \
2670   diagnostic(bool, PrintSignatureHandlers, false,                           \
2671           "Print code generated for native method signature handlers")      \
2672                                                                             \
2673   develop(bool, VerifyOops, false,                                          \
2674           "Do plausibility checks for oops")                                \
2675                                                                             \
2676   develop(bool, CheckUnhandledOops, false,                                  \
2677           "Check for unhandled oops in VM code")                            \
2678                                                                             \
2679   develop(bool, VerifyJNIFields, trueInDebug,                               \
2680           "Verify jfieldIDs for instance fields")                           \
2681                                                                             \
2682   notproduct(bool, VerifyJNIEnvThread, false,                               \
2683           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2684           "from JNI")                                                       \
2685                                                                             \
2686   develop(bool, VerifyFPU, false,                                           \
2687           "Verify FPU state (check for NaN's, etc.)")                       \
2688                                                                             \
2689   develop(bool, VerifyThread, false,                                        \
2690           "Watch the thread register for corruption (SPARC only)")          \
2691                                                                             \
2692   develop(bool, VerifyActivationFrameSize, false,                           \
2693           "Verify that activation frame didn't become smaller than its "    \
2694           "minimal size")                                                   \
2695                                                                             \
2696   develop(bool, TraceFrequencyInlining, false,                              \
2697           "Trace frequency based inlining")                                 \
2698                                                                             \
2699   develop_pd(bool, InlineIntrinsics,                                        \
2700            "Inline intrinsics that can be statically resolved")             \
2701                                                                             \
2702   product_pd(bool, ProfileInterpreter,                                      \
2703            "Profile at the bytecode level during interpretation")           \
2704                                                                             \
2705   develop_pd(bool, ProfileTraps,                                            \
2706           "Profile deoptimization traps at the bytecode level")             \
2707                                                                             \
2708   product(intx, ProfileMaturityPercentage, 20,                              \
2709           "number of method invocations/branches (expressed as % of "       \
2710           "CompileThreshold) before using the method's profile")            \
2711                                                                             \
2712   develop(bool, PrintMethodData, false,                                     \
2713            "Print the results of +ProfileInterpreter at end of run")        \
2714                                                                             \
2715   develop(bool, VerifyDataPointer, trueInDebug,                             \
2716           "Verify the method data pointer during interpreter profiling")    \
2717                                                                             \
2718   develop(bool, VerifyCompiledCode, false,                                  \
2719           "Include miscellaneous runtime verifications in nmethod code; "   \
2720           "default off because it disturbs nmethod size heuristics")        \
2721                                                                             \
2722   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2723           "Manually make GC thread crash then dump java stack trace;  "     \
2724           "Test only")                                                      \
2725                                                                             \
2726   /* compilation */                                                         \
2727   product(bool, UseCompiler, true,                                          \
2728           "use compilation")                                                \
2729                                                                             \
2730   develop(bool, TraceCompilationPolicy, false,                              \
2731           "Trace compilation policy")                                       \
2732                                                                             \
2733   develop(bool, TimeCompilationPolicy, false,                               \
2734           "Time the compilation policy")                                    \
2735                                                                             \
2736   product(bool, UseCounterDecay, true,                                      \
2737            "adjust recompilation counters")                                 \
2738                                                                             \
2739   develop(intx, CounterHalfLifeTime,    30,                                 \
2740           "half-life time of invocation counters (in secs)")                \
2741                                                                             \
2742   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2743           "Min. ms. between invocation of CounterDecay")                    \
2744                                                                             \
2745   product(bool, AlwaysCompileLoopMethods, false,                            \
2746           "when using recompilation, never interpret methods "              \
2747           "containing loops")                                               \
2748                                                                             \
2749   product(bool, DontCompileHugeMethods, true,                               \
2750           "don't compile methods > HugeMethodLimit")                        \
2751                                                                             \
2752   /* Bytecode escape analysis estimation. */                                \
2753   product(bool, EstimateArgEscape, true,                                    \
2754           "Analyze bytecodes to estimate escape state of arguments")        \
2755                                                                             \
2756   product(intx, BCEATraceLevel, 0,                                          \
2757           "How much tracing to do of bytecode escape analysis estimates")   \
2758                                                                             \
2759   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2760           "Maximum number of nested calls that are analyzed by BC EA.")     \
2761                                                                             \
2762   product(intx, MaxBCEAEstimateSize, 150,                                   \
2763           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2764                                                                             \
2765   product(intx,  AllocatePrefetchStyle, 1,                                  \
2766           "0 = no prefetch, "                                               \
2767           "1 = prefetch instructions for each allocation, "                 \
2768           "2 = use TLAB watermark to gate allocation prefetch, "            \
2769           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2770                                                                             \
2771   product(intx,  AllocatePrefetchDistance, -1,                              \
2772           "Distance to prefetch ahead of allocation pointer")               \
2773                                                                             \
2774   product(intx,  AllocatePrefetchLines, 3,                                  \
2775           "Number of lines to prefetch ahead of array allocation pointer")  \
2776                                                                             \
2777   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2778           "Number of lines to prefetch ahead of instance allocation pointer") \
2779                                                                             \
2780   product(intx,  AllocatePrefetchStepSize, 16,                              \
2781           "Step size in bytes of sequential prefetch instructions")         \
2782                                                                             \
2783   product(intx,  AllocatePrefetchInstr, 0,                                  \
2784           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2785                                                                             \
2786   /* deoptimization */                                                      \
2787   develop(bool, TraceDeoptimization, false,                                 \
2788           "Trace deoptimization")                                           \
2789                                                                             \
2790   develop(bool, DebugDeoptimization, false,                                 \
2791           "Tracing various information while debugging deoptimization")     \
2792                                                                             \
2793   product(intx, SelfDestructTimer, 0,                                       \
2794           "Will cause VM to terminate after a given time (in minutes) "     \
2795           "(0 means off)")                                                  \
2796                                                                             \
2797   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2798           "Max. no. of lines in the stack trace for Java exceptions "       \
2799           "(0 means all)")                                                  \
2800                                                                             \
2801   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2802           "Guarantee a safepoint (at least) every so many milliseconds "    \
2803           "(0 means none)"))                                                \
2804                                                                             \
2805   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2806           "Guarantee a safepoint (at least) every so many milliseconds "    \
2807           "(0 means none)"))                                                \
2808                                                                             \
2809   product(intx, SafepointTimeoutDelay, 10000,                               \
2810           "Delay in milliseconds for option SafepointTimeout")              \
2811                                                                             \
2812   product(intx, NmethodSweepFraction, 16,                                   \
2813           "Number of invocations of sweeper to cover all nmethods")         \
2814                                                                             \
2815   product(intx, NmethodSweepCheckInterval, 5,                               \
2816           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2817                                                                             \
2818   notproduct(bool, LogSweeper, false,                                       \
2819             "Keep a ring buffer of sweeper activity")                       \
2820                                                                             \
2821   notproduct(intx, SweeperLogEntries, 1024,                                 \
2822             "Number of records in the ring buffer of sweeper activity")     \
2823                                                                             \
2824   notproduct(intx, MemProfilingInterval, 500,                               \
2825           "Time between each invocation of the MemProfiler")                \
2826                                                                             \
2827   develop(intx, MallocCatchPtr, -1,                                         \
2828           "Hit breakpoint when mallocing/freeing this pointer")             \
2829                                                                             \
2830   notproduct(intx, AssertRepeat, 1,                                         \
2831           "number of times to evaluate expression in assert "               \
2832           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2833                                                                             \
2834   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2835           "List of assertions (file:line) to muzzle")                       \
2836                                                                             \
2837   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2838           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2839           "is used")                                                        \
2840                                                                             \
2841   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2842           "Threshold for total handle allocation when "                     \
2843           "+TraceHandleAllocation is used")                                 \
2844                                                                             \
2845   develop(intx, StackPrintLimit, 100,                                       \
2846           "number of stack frames to print in VM-level stack dump")         \
2847                                                                             \
2848   notproduct(intx, MaxElementPrintSize, 256,                                \
2849           "maximum number of elements to print")                            \
2850                                                                             \
2851   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2852           "maximum number of subklasses to print when printing klass")      \
2853                                                                             \
2854   product(intx, MaxInlineLevel, 9,                                          \
2855           "maximum number of nested calls that are inlined")                \
2856                                                                             \
2857   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2858           "maximum number of nested recursive calls that are inlined")      \
2859                                                                             \
2860   product_pd(intx, InlineSmallCode,                                         \
2861           "Only inline already compiled methods if their code size is "     \
2862           "less than this")                                                 \
2863                                                                             \
2864   product(intx, MaxInlineSize, 35,                                          \
2865           "maximum bytecode size of a method to be inlined")                \
2866                                                                             \
2867   product_pd(intx, FreqInlineSize,                                          \
2868           "maximum bytecode size of a frequent method to be inlined")       \
2869                                                                             \
2870   product(intx, MaxTrivialSize, 6,                                          \
2871           "maximum bytecode size of a trivial method to be inlined")        \
2872                                                                             \
2873   product(intx, MinInliningThreshold, 250,                                  \
2874           "min. invocation count a method needs to have to be inlined")     \
2875                                                                             \
2876   develop(intx, MethodHistogramCutoff, 100,                                 \
2877           "cutoff value for method invoc. histogram (+CountCalls)")         \
2878                                                                             \
2879   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2880           "# of interpreted methods to show in profile")                    \
2881                                                                             \
2882   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2883           "# of compiled methods to show in profile")                       \
2884                                                                             \
2885   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2886           "# of stub methods to show in profile")                           \
2887                                                                             \
2888   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2889           "# of runtime stub nodes to show in profile")                     \
2890                                                                             \
2891   product(intx, ProfileIntervalsTicks, 100,                                 \
2892           "# of ticks between printing of interval profile "                \
2893           "(+ProfileIntervals)")                                            \
2894                                                                             \
2895   notproduct(intx, ScavengeALotInterval,     1,                             \
2896           "Interval between which scavenge will occur with +ScavengeALot")  \
2897                                                                             \
2898   notproduct(intx, FullGCALotInterval,     1,                               \
2899           "Interval between which full gc will occur with +FullGCALot")     \
2900                                                                             \
2901   notproduct(intx, FullGCALotStart,     0,                                  \
2902           "For which invocation to start FullGCAlot")                       \
2903                                                                             \
2904   notproduct(intx, FullGCALotDummies,  32*K,                                \
2905           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2906           "to move")                                                        \
2907                                                                             \
2908   develop(intx, DontYieldALotInterval,    10,                               \
2909           "Interval between which yields will be dropped (milliseconds)")   \
2910                                                                             \
2911   develop(intx, MinSleepInterval,     1,                                    \
2912           "Minimum sleep() interval (milliseconds) when "                   \
2913           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2914                                                                             \
2915   develop(intx, ProfilerPCTickThreshold,    15,                             \
2916           "Number of ticks in a PC buckets to be a hotspot")                \
2917                                                                             \
2918   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2919           "Number of exits until DeoptimizeALot kicks in")                  \
2920                                                                             \
2921   notproduct(intx, ZombieALotInterval,     5,                               \
2922           "Number of exits until ZombieALot kicks in")                      \
2923                                                                             \
2924   develop(bool, StressNonEntrant, false,                                    \
2925           "Mark nmethods non-entrant at registration")                      \
2926                                                                             \
2927   diagnostic(intx, MallocVerifyInterval,     0,                             \
2928           "if non-zero, verify C heap after every N calls to "              \
2929           "malloc/realloc/free")                                            \
2930                                                                             \
2931   diagnostic(intx, MallocVerifyStart,     0,                                \
2932           "if non-zero, start verifying C heap after Nth call to "          \
2933           "malloc/realloc/free")                                            \
2934                                                                             \
2935   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2936           "if non-zero, max # of Words that malloc/realloc can allocate "   \
2937           "(for testing only)")                                             \
2938                                                                             \
2939   product(intx, TypeProfileWidth,     2,                                    \
2940           "number of receiver types to record in call/cast profile")        \
2941                                                                             \
2942   develop(intx, BciProfileWidth,      2,                                    \
2943           "number of return bci's to record in ret profile")                \
2944                                                                             \
2945   product(intx, PerMethodRecompilationCutoff, 400,                          \
2946           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2947                                                                             \
2948   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
2949           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2950                                                                             \
2951   product(intx, PerMethodTrapLimit,  100,                                   \
2952           "Limit on traps (of one kind) in a method (includes inlines)")    \
2953                                                                             \
2954   product(intx, PerBytecodeTrapLimit,  4,                                   \
2955           "Limit on traps (of one kind) at a particular BCI")               \
2956                                                                             \
2957   develop(intx, InlineFrequencyRatio,    20,                                \
2958           "Ratio of call site execution to caller method invocation")       \
2959                                                                             \
2960   develop_pd(intx, InlineFrequencyCount,                                    \
2961           "Count of call site execution necessary to trigger frequent "     \
2962           "inlining")                                                       \
2963                                                                             \
2964   develop(intx, InlineThrowCount,    50,                                    \
2965           "Force inlining of interpreted methods that throw this often")    \
2966                                                                             \
2967   develop(intx, InlineThrowMaxSize,   200,                                  \
2968           "Force inlining of throwing methods smaller than this")           \
2969                                                                             \
2970   develop(intx, ProfilerNodeSize,  1024,                                    \
2971           "Size in K to allocate for the Profile Nodes of each thread")     \
2972                                                                             \
2973   product_pd(intx, PreInflateSpin,                                          \
2974           "Number of times to spin wait before inflation")                  \
2975                                                                             \
2976   /* gc parameters */                                                       \
2977   product(uintx, InitialHeapSize, 0,                                        \
2978           "Initial heap size (in bytes); zero means use ergonomics")        \
2979                                                                             \
2980   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
2981           "Maximum heap size (in bytes)")                                   \
2982                                                                             \
2983   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
2984           "Initial tenured generation size (in bytes)")                     \
2985                                                                             \
2986   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
2987           "Initial new generation size (in bytes)")                         \
2988                                                                             \
2989   product(uintx, MaxNewSize, max_uintx,                                     \
2990           "Maximum new generation size (in bytes), max_uintx means set "    \
2991           "ergonomically")                                                  \
2992                                                                             \
2993   product(uintx, PretenureSizeThreshold, 0,                                 \
2994           "Maximum size in bytes of objects allocated in DefNew "           \
2995           "generation; zero means no maximum")                              \
2996                                                                             \
2997   product(uintx, TLABSize, 0,                                               \
2998           "Starting TLAB size (in bytes); zero means set ergonomically")    \
2999                                                                             \
3000   product(uintx, MinTLABSize, 2*K,                                          \
3001           "Minimum allowed TLAB size (in bytes)")                           \
3002                                                                             \
3003   product(uintx, TLABAllocationWeight, 35,                                  \
3004           "Allocation averaging weight")                                    \
3005                                                                             \
3006   product(uintx, TLABWasteTargetPercent, 1,                                 \
3007           "Percentage of Eden that can be wasted")                          \
3008                                                                             \
3009   product(uintx, TLABRefillWasteFraction,    64,                            \
3010           "Max TLAB waste at a refill (internal fragmentation)")            \
3011                                                                             \
3012   product(uintx, TLABWasteIncrement,    4,                                  \
3013           "Increment allowed waste at slow allocation")                     \
3014                                                                             \
3015   product(uintx, SurvivorRatio, 8,                                          \
3016           "Ratio of eden/survivor space size")                              \
3017                                                                             \
3018   product(uintx, NewRatio, 2,                                               \
3019           "Ratio of new/old generation sizes")                              \
3020                                                                             \
3021   product_pd(uintx, NewSizeThreadIncrease,                                  \
3022           "Additional size added to desired new generation size per "       \
3023           "non-daemon thread (in bytes)")                                   \
3024                                                                             \
3025   product_pd(uintx, MetaspaceSize,                                          \
3026           "Initial size of Metaspaces (in bytes)")                          \
3027                                                                             \
3028   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3029           "Maximum size of Metaspaces (in bytes)")                          \
3030                                                                             \
3031   product(uintx, ClassMetaspaceSize, 2*M,                                   \
3032           "Maximum size of InstanceKlass area in Metaspace used for "       \
3033           "UseCompressedKlassPointers")                                     \
3034                                                                             \
3035   product(uintx, MinHeapFreeRatio,    40,                                   \
3036           "Min percentage of heap free after GC to avoid expansion")        \
3037                                                                             \
3038   product(uintx, MaxHeapFreeRatio,    70,                                   \
3039           "Max percentage of heap free after GC to avoid shrinking")        \
3040                                                                             \
3041   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3042           "Number of milliseconds per MB of free space in the heap")        \
3043                                                                             \
3044   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3045           "Min change in heap space due to GC (in bytes)")                  \
3046                                                                             \
3047   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3048           "Min expansion of Metaspace (in bytes)")                          \
3049                                                                             \
3050   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3051           "Min percentage of Metaspace free after GC to avoid expansion")   \
3052                                                                             \
3053   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3054           "Max percentage of Metaspace free after GC to avoid shrinking")   \
3055                                                                             \
3056   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3057           "Max expansion of Metaspace without full GC (in bytes)")          \
3058                                                                             \
3059   product(uintx, QueuedAllocationWarningCount, 0,                           \
3060           "Number of times an allocation that queues behind a GC "          \
3061           "will retry before printing a warning")                           \
3062                                                                             \
3063   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3064           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3065                                                                             \
3066   diagnostic(intx, VerifyGCLevel,     0,                                    \
3067           "Generation level at which to start +VerifyBefore/AfterGC")       \
3068                                                                             \
3069   product(uintx, MaxTenuringThreshold,    15,                               \
3070           "Maximum value for tenuring threshold")                           \
3071                                                                             \
3072   product(uintx, InitialTenuringThreshold,    7,                            \
3073           "Initial value for tenuring threshold")                           \
3074                                                                             \
3075   product(uintx, TargetSurvivorRatio,    50,                                \
3076           "Desired percentage of survivor space used after scavenge")       \
3077                                                                             \
3078   product(uintx, MarkSweepDeadRatio,     5,                                 \
3079           "Percentage (0-100) of the old gen allowed as dead wood."         \
3080           "Serial mark sweep treats this as both the min and max value."    \
3081           "CMS uses this value only if it falls back to mark sweep."        \
3082           "Par compact uses a variable scale based on the density of the"   \
3083           "generation and treats this as the max value when the heap is"    \
3084           "either completely full or completely empty.  Par compact also"   \
3085           "has a smaller default value; see arguments.cpp.")                \
3086                                                                             \
3087   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3088           "How often should we fully compact the heap (ignoring the dead "  \
3089           "space parameters)")                                              \
3090                                                                             \
3091   product(intx, PrintCMSStatistics, 0,                                      \
3092           "Statistics for CMS")                                             \
3093                                                                             \
3094   product(bool, PrintCMSInitiationStatistics, false,                        \
3095           "Statistics for initiating a CMS collection")                     \
3096                                                                             \
3097   product(intx, PrintFLSStatistics, 0,                                      \
3098           "Statistics for CMS' FreeListSpace")                              \
3099                                                                             \
3100   product(intx, PrintFLSCensus, 0,                                          \
3101           "Census for CMS' FreeListSpace")                                  \
3102                                                                             \
3103   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3104           "Delay in ms between expansion and allocation")                   \
3105                                                                             \
3106   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3107           "Delay in ms in scheduling GC workers")                           \
3108                                                                             \
3109   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3110           "(Unstable) Number of times to iterate in safepoint loop "        \
3111           " before blocking VM threads ")                                   \
3112                                                                             \
3113   product(intx, DeferPollingPageLoopCount,     -1,                          \
3114           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3115           "before changing safepoint polling page to RO ")                  \
3116                                                                             \
3117   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3118                                                                             \
3119   product(bool, PSChunkLargeArrays, true,                                   \
3120           "true: process large arrays in chunks")                           \
3121                                                                             \
3122   product(uintx, GCDrainStackTargetSize, 64,                                \
3123           "how many entries we'll try to leave on the stack during "        \
3124           "parallel GC")                                                    \
3125                                                                             \
3126   /* stack parameters */                                                    \
3127   product_pd(intx, StackYellowPages,                                        \
3128           "Number of yellow zone (recoverable overflows) pages")            \
3129                                                                             \
3130   product_pd(intx, StackRedPages,                                           \
3131           "Number of red zone (unrecoverable overflows) pages")             \
3132                                                                             \
3133   product_pd(intx, StackShadowPages,                                        \
3134           "Number of shadow zone (for overflow checking) pages"             \
3135           " this should exceed the depth of the VM and native call stack")  \
3136                                                                             \
3137   product_pd(intx, ThreadStackSize,                                         \
3138           "Thread Stack Size (in Kbytes)")                                  \
3139                                                                             \
3140   product_pd(intx, VMThreadStackSize,                                       \
3141           "Non-Java Thread Stack Size (in Kbytes)")                         \
3142                                                                             \
3143   product_pd(intx, CompilerThreadStackSize,                                 \
3144           "Compiler Thread Stack Size (in Kbytes)")                         \
3145                                                                             \
3146   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3147           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3148                                                                             \
3149   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3150           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3151           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3152           "disable this feature")                                           \
3153                                                                             \
3154   /* code cache parameters */                                               \
3155   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3156           "Code cache segment size (in bytes) - smallest unit of "          \
3157           "allocation")                                                     \
3158                                                                             \
3159   develop_pd(intx, CodeEntryAlignment,                                      \
3160           "Code entry alignment for generated code (in bytes)")             \
3161                                                                             \
3162   product_pd(intx, OptoLoopAlignment,                                       \
3163           "Align inner loops to zero relative to this modulus")             \
3164                                                                             \
3165   product_pd(uintx, InitialCodeCacheSize,                                   \
3166           "Initial code cache size (in bytes)")                             \
3167                                                                             \
3168   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3169           "Minimum code cache size (in bytes) required to start VM.")       \
3170                                                                             \
3171   product_pd(uintx, ReservedCodeCacheSize,                                  \
3172           "Reserved code cache size (in bytes) - maximum code cache size")  \
3173                                                                             \
3174   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3175           "When less than X space left, we stop compiling.")                \
3176                                                                             \
3177   product_pd(uintx, CodeCacheExpansionSize,                                 \
3178           "Code cache expansion size (in bytes)")                           \
3179                                                                             \
3180   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3181           "Minimum number of segments in a code cache block.")              \
3182                                                                             \
3183   notproduct(bool, ExitOnFullCodeCache, false,                              \
3184           "Exit the VM if we fill the code cache.")                         \
3185                                                                             \
3186   product(bool, UseCodeCacheFlushing, true,                                 \
3187           "Attempt to clean the code cache before shutting off compiler")   \
3188                                                                             \
3189   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3190           "Min number of seconds between code cache cleaning sessions")     \
3191                                                                             \
3192   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3193           "When less than X space left, start code cache cleaning")         \
3194                                                                             \
3195   product(uintx, CodeCacheFlushingFraction, 2,                              \
3196           "Fraction of the code cache that is flushed when full")           \
3197                                                                             \
3198   /* interpreter debugging */                                               \
3199   develop(intx, BinarySwitchThreshold, 5,                                   \
3200           "Minimal number of lookupswitch entries for rewriting to binary " \
3201           "switch")                                                         \
3202                                                                             \
3203   develop(intx, StopInterpreterAt, 0,                                       \
3204           "Stops interpreter execution at specified bytecode number")       \
3205                                                                             \
3206   develop(intx, TraceBytecodesAt, 0,                                        \
3207           "Traces bytecodes starting with specified bytecode number")       \
3208                                                                             \
3209   /* compiler interface */                                                  \
3210   develop(intx, CIStart, 0,                                                 \
3211           "the id of the first compilation to permit")                      \
3212                                                                             \
3213   develop(intx, CIStop,    -1,                                              \
3214           "the id of the last compilation to permit")                       \
3215                                                                             \
3216   develop(intx, CIStartOSR,     0,                                          \
3217           "the id of the first osr compilation to permit "                  \
3218           "(CICountOSR must be on)")                                        \
3219                                                                             \
3220   develop(intx, CIStopOSR,    -1,                                           \
3221           "the id of the last osr compilation to permit "                   \
3222           "(CICountOSR must be on)")                                        \
3223                                                                             \
3224   develop(intx, CIBreakAtOSR,    -1,                                        \
3225           "id of osr compilation to break at")                              \
3226                                                                             \
3227   develop(intx, CIBreakAt,    -1,                                           \
3228           "id of compilation to break at")                                  \
3229                                                                             \
3230   product(ccstrlist, CompileOnly, "",                                       \
3231           "List of methods (pkg/class.name) to restrict compilation to")    \
3232                                                                             \
3233   product(ccstr, CompileCommandFile, NULL,                                  \
3234           "Read compiler commands from this file [.hotspot_compiler]")      \
3235                                                                             \
3236   product(ccstrlist, CompileCommand, "",                                    \
3237           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3238                                                                             \
3239   develop(bool, ReplayCompiles, false,                                      \
3240           "Enable replay of compilations from ReplayDataFile")              \
3241                                                                             \
3242   product(ccstr, ReplayDataFile, NULL,                                      \
3243           "File containing compilation replay information"                  \
3244           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3245                                                                             \
3246   develop(intx, ReplaySuppressInitializers, 2,                              \
3247           "Controls handling of class initialization during replay"         \
3248           "0 - don't do anything special"                                   \
3249           "1 - treat all class initializers as empty"                       \
3250           "2 - treat class initializers for application classes as empty"   \
3251           "3 - allow all class initializers to run during bootstrap but"    \
3252           "    pretend they are empty after starting replay")               \
3253                                                                             \
3254   develop(bool, ReplayIgnoreInitErrors, false,                              \
3255           "Ignore exceptions thrown during initialization for replay")      \
3256                                                                             \
3257   product(bool, DumpReplayDataOnError, true,                                \
3258           "Record replay data for crashing compiler threads")               \
3259                                                                             \
3260   product(bool, CICompilerCountPerCPU, false,                               \
3261           "1 compiler thread for log(N CPUs)")                              \
3262                                                                             \
3263   develop(intx, CIFireOOMAt,    -1,                                         \
3264           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3265           "(non-negative value throws OOM after this many CI accesses "     \
3266           "in each compile)")                                               \
3267   notproduct(intx, CICrashAt, -1,                                           \
3268           "id of compilation to trigger assert in compiler thread for "     \
3269           "the purpose of testing, e.g. generation of replay data")         \
3270   notproduct(bool, CIObjectFactoryVerify, false,                            \
3271           "enable potentially expensive verification in ciObjectFactory")   \
3272                                                                             \
3273   /* Priorities */                                                          \
3274   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3275                                                                             \
3276   product(intx, ThreadPriorityPolicy, 0,                                    \
3277           "0 : Normal.                                                     "\
3278           "    VM chooses priorities that are appropriate for normal       "\
3279           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3280           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3281           "    map to lower native priority values. On Windows applications"\
3282           "    are allowed to use higher native priorities. However, with  "\
3283           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3284           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3285           "    interfere with system threads. On Linux thread priorities   "\
3286           "    are ignored because the OS does not support static priority "\
3287           "    in SCHED_OTHER scheduling class which is the only choice for"\
3288           "    non-root, non-realtime applications.                        "\
3289           "1 : Aggressive.                                                 "\
3290           "    Java thread priorities map over to the entire range of      "\
3291           "    native thread priorities. Higher Java thread priorities map "\
3292           "    to higher native thread priorities. This policy should be   "\
3293           "    used with care, as sometimes it can cause performance       "\
3294           "    degradation in the application and/or the entire system. On "\
3295           "    Linux this policy requires root privilege.")                 \
3296                                                                             \
3297   product(bool, ThreadPriorityVerbose, false,                               \
3298           "Print priority changes")                                         \
3299                                                                             \
3300   product(intx, DefaultThreadPriority, -1,                                  \
3301           "The native priority at which threads run if not elsewhere "      \
3302           "specified (-1 means no change)")                                 \
3303                                                                             \
3304   product(intx, CompilerThreadPriority, -1,                                 \
3305           "The native priority at which compiler threads should run "       \
3306           "(-1 means no change)")                                           \
3307                                                                             \
3308   product(intx, VMThreadPriority, -1,                                       \
3309           "The native priority at which the VM thread should run "          \
3310           "(-1 means no change)")                                           \
3311                                                                             \
3312   product(bool, CompilerThreadHintNoPreempt, true,                          \
3313           "(Solaris only) Give compiler threads an extra quanta")           \
3314                                                                             \
3315   product(bool, VMThreadHintNoPreempt, false,                               \
3316           "(Solaris only) Give VM thread an extra quanta")                  \
3317                                                                             \
3318   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3319   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3320   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3321   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3322   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3323   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3324   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3325   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3326   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3327   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3328                                                                             \
3329   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3330           "Java thread priority 10 maps to critical scheduling priority")   \
3331                                                                             \
3332   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3333           "Compiler thread(s) run at critical scheduling priority")         \
3334                                                                             \
3335   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3336           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3337                                                                             \
3338   /* compiler debugging */                                                  \
3339   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3340           "First class to consider when using +CompileTheWorld")            \
3341                                                                             \
3342   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3343           "Last class to consider when using +CompileTheWorld")             \
3344                                                                             \
3345   develop(intx, NewCodeParameter,      0,                                   \
3346           "Testing Only: Create a dedicated integer parameter before "      \
3347           "putback")                                                        \
3348                                                                             \
3349   /* new oopmap storage allocation */                                       \
3350   develop(intx, MinOopMapAllocation,     8,                                 \
3351           "Minimum number of OopMap entries in an OopMapSet")               \
3352                                                                             \
3353   /* Background Compilation */                                              \
3354   develop(intx, LongCompileThreshold,     50,                               \
3355           "Used with +TraceLongCompiles")                                   \
3356                                                                             \
3357   product(intx, StarvationMonitorInterval,    200,                          \
3358           "Pause between each check in ms")                                 \
3359                                                                             \
3360   /* recompilation */                                                       \
3361   product_pd(intx, CompileThreshold,                                        \
3362           "number of interpreted method invocations before (re-)compiling") \
3363                                                                             \
3364   product_pd(intx, BackEdgeThreshold,                                       \
3365           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3366                                                                             \
3367   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3368           "Interpreter (tier 0) invocation notification frequency.")        \
3369                                                                             \
3370   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3371           "C1 without MDO (tier 2) invocation notification frequency.")     \
3372                                                                             \
3373   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3374           "C1 with MDO profiling (tier 3) invocation notification "         \
3375           "frequency.")                                                     \
3376                                                                             \
3377   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3378           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3379                                                                             \
3380   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3381           "Interpreter (tier 0) invocation notification frequency.")        \
3382                                                                             \
3383   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3384           "C1 without MDO (tier 2) invocation notification frequency.")     \
3385                                                                             \
3386   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3387           "C1 with MDO profiling (tier 3) invocation notification "         \
3388           "frequency.")                                                     \
3389                                                                             \
3390   product(intx, Tier2CompileThreshold, 0,                                   \
3391           "threshold at which tier 2 compilation is invoked")               \
3392                                                                             \
3393   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3394           "Back edge threshold at which tier 2 compilation is invoked")     \
3395                                                                             \
3396   product(intx, Tier3InvocationThreshold, 200,                              \
3397           "Compile if number of method invocations crosses this "           \
3398           "threshold")                                                      \
3399                                                                             \
3400   product(intx, Tier3MinInvocationThreshold, 100,                           \
3401           "Minimum invocation to compile at tier 3")                        \
3402                                                                             \
3403   product(intx, Tier3CompileThreshold, 2000,                                \
3404           "Threshold at which tier 3 compilation is invoked (invocation "   \
3405           "minimum must be satisfied.")                                     \
3406                                                                             \
3407   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3408           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3409                                                                             \
3410   product(intx, Tier4InvocationThreshold, 5000,                             \
3411           "Compile if number of method invocations crosses this "           \
3412           "threshold")                                                      \
3413                                                                             \
3414   product(intx, Tier4MinInvocationThreshold, 600,                           \
3415           "Minimum invocation to compile at tier 4")                        \
3416                                                                             \
3417   product(intx, Tier4CompileThreshold, 15000,                               \
3418           "Threshold at which tier 4 compilation is invoked (invocation "   \
3419           "minimum must be satisfied.")                                     \
3420                                                                             \
3421   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3422           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3423                                                                             \
3424   product(intx, Tier3DelayOn, 5,                                            \
3425           "If C2 queue size grows over this amount per compiler thread "    \
3426           "stop compiling at tier 3 and start compiling at tier 2")         \
3427                                                                             \
3428   product(intx, Tier3DelayOff, 2,                                           \
3429           "If C2 queue size is less than this amount per compiler thread "  \
3430           "allow methods compiled at tier 2 transition to tier 3")          \
3431                                                                             \
3432   product(intx, Tier3LoadFeedback, 5,                                       \
3433           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3434           "reaches this amount per compiler thread")                        \
3435                                                                             \
3436   product(intx, Tier4LoadFeedback, 3,                                       \
3437           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3438           "reaches this amount per compiler thread")                        \
3439                                                                             \
3440   product(intx, TieredCompileTaskTimeout, 50,                               \
3441           "Kill compile task if method was not used within "                \
3442           "given timeout in milliseconds")                                  \
3443                                                                             \
3444   product(intx, TieredStopAtLevel, 4,                                       \
3445           "Stop at given compilation level")                                \
3446                                                                             \
3447   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3448           "Start profiling in interpreter if the counters exceed tier 3"    \
3449           "thresholds by the specified percentage")                         \
3450                                                                             \
3451   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3452           "Increase the compile threshold for C1 compilation if the code"   \
3453           "cache is filled by the specified percentage.")                   \
3454                                                                             \
3455   product(intx, TieredRateUpdateMinTime, 1,                                 \
3456           "Minimum rate sampling interval (in milliseconds)")               \
3457                                                                             \
3458   product(intx, TieredRateUpdateMaxTime, 25,                                \
3459           "Maximum rate sampling interval (in milliseconds)")               \
3460                                                                             \
3461   product_pd(bool, TieredCompilation,                                       \
3462           "Enable tiered compilation")                                      \
3463                                                                             \
3464   product(bool, PrintTieredEvents, false,                                   \
3465           "Print tiered events notifications")                              \
3466                                                                             \
3467   product_pd(intx, OnStackReplacePercentage,                                \
3468           "NON_TIERED number of method invocations/branches (expressed as %"\
3469           "of CompileThreshold) before (re-)compiling OSR code")            \
3470                                                                             \
3471   product(intx, InterpreterProfilePercentage, 33,                           \
3472           "NON_TIERED number of method invocations/branches (expressed as %"\
3473           "of CompileThreshold) before profiling in the interpreter")       \
3474                                                                             \
3475   develop(intx, MaxRecompilationSearchLength,    10,                        \
3476           "max. # frames to inspect searching for recompilee")              \
3477                                                                             \
3478   develop(intx, MaxInterpretedSearchLength,     3,                          \
3479           "max. # interp. frames to skip when searching for recompilee")    \
3480                                                                             \
3481   develop(intx, DesiredMethodLimit,  8000,                                  \
3482           "desired max. method size (in bytecodes) after inlining")         \
3483                                                                             \
3484   develop(intx, HugeMethodLimit,  8000,                                     \
3485           "don't compile methods larger than this if "                      \
3486           "+DontCompileHugeMethods")                                        \
3487                                                                             \
3488   /* New JDK 1.4 reflection implementation */                               \
3489                                                                             \
3490   develop(bool, UseNewReflection, true,                                     \
3491           "Temporary flag for transition to reflection based on dynamic "   \
3492           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3493           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3494           "changes were needed")                                            \
3495                                                                             \
3496   develop(bool, VerifyReflectionBytecodes, false,                           \
3497           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3498           "in situations like that described in 4486457 or for "            \
3499           "constructors generated for serialization, so can not be enabled "\
3500           "in product.")                                                    \
3501                                                                             \
3502   product(bool, ReflectionWrapResolutionErrors, true,                       \
3503           "Temporary flag for transition to AbstractMethodError wrapped "   \
3504           "in InvocationTargetException. See 6531596")                      \
3505                                                                             \
3506                                                                             \
3507   develop(intx, FastSuperclassLimit, 8,                                     \
3508           "Depth of hardwired instanceof accelerator array")                \
3509                                                                             \
3510   /* Properties for Java libraries  */                                      \
3511                                                                             \
3512   product(uintx, MaxDirectMemorySize, 0,                                    \
3513           "Maximum total size of NIO direct-buffer allocations")            \
3514                                                                             \
3515   /* temporary developer defined flags  */                                  \
3516                                                                             \
3517   diagnostic(bool, UseNewCode, false,                                       \
3518           "Testing Only: Use the new version while testing")                \
3519                                                                             \
3520   diagnostic(bool, UseNewCode2, false,                                      \
3521           "Testing Only: Use the new version while testing")                \
3522                                                                             \
3523   diagnostic(bool, UseNewCode3, false,                                      \
3524           "Testing Only: Use the new version while testing")                \
3525                                                                             \
3526   /* flags for performance data collection */                               \
3527                                                                             \
3528   product(bool, UsePerfData, falseInEmbedded,                               \
3529           "Flag to disable jvmstat instrumentation for performance testing" \
3530           "and problem isolation purposes.")                                \
3531                                                                             \
3532   product(bool, PerfDataSaveToFile, false,                                  \
3533           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3534                                                                             \
3535   product(ccstr, PerfDataSaveFile, NULL,                                    \
3536           "Save PerfData memory to the specified absolute pathname,"        \
3537            "%p in the file name if present will be replaced by pid")        \
3538                                                                             \
3539   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3540           "Data sampling interval in milliseconds")                         \
3541                                                                             \
3542   develop(bool, PerfTraceDataCreation, false,                               \
3543           "Trace creation of Performance Data Entries")                     \
3544                                                                             \
3545   develop(bool, PerfTraceMemOps, false,                                     \
3546           "Trace PerfMemory create/attach/detach calls")                    \
3547                                                                             \
3548   product(bool, PerfDisableSharedMem, false,                                \
3549           "Store performance data in standard memory")                      \
3550                                                                             \
3551   product(intx, PerfDataMemorySize, 32*K,                                   \
3552           "Size of performance data memory region. Will be rounded "        \
3553           "up to a multiple of the native os page size.")                   \
3554                                                                             \
3555   product(intx, PerfMaxStringConstLength, 1024,                             \
3556           "Maximum PerfStringConstant string length before truncation")     \
3557                                                                             \
3558   product(bool, PerfAllowAtExitRegistration, false,                         \
3559           "Allow registration of atexit() methods")                         \
3560                                                                             \
3561   product(bool, PerfBypassFileSystemCheck, false,                           \
3562           "Bypass Win32 file system criteria checks (Windows Only)")        \
3563                                                                             \
3564   product(intx, UnguardOnExecutionViolation, 0,                             \
3565           "Unguard page and retry on no-execute fault (Win32 only)"         \
3566           "0=off, 1=conservative, 2=aggressive")                            \
3567                                                                             \
3568   /* Serviceability Support */                                              \
3569                                                                             \
3570   product(bool, ManagementServer, false,                                    \
3571           "Create JMX Management Server")                                   \
3572                                                                             \
3573   product(bool, DisableAttachMechanism, false,                              \
3574          "Disable mechanism that allows tools to attach to this VM")        \
3575                                                                             \
3576   product(bool, StartAttachListener, false,                                 \
3577           "Always start Attach Listener at VM startup")                     \
3578                                                                             \
3579   manageable(bool, PrintConcurrentLocks, false,                             \
3580           "Print java.util.concurrent locks in thread dump")                \
3581                                                                             \
3582   product(bool, TransmitErrorReport, false,                                 \
3583           "Enable error report transmission on erroneous termination")      \
3584                                                                             \
3585   product(ccstr, ErrorReportServer, NULL,                                   \
3586           "Override built-in error report server address")                  \
3587                                                                             \
3588   /* Shared spaces */                                                       \
3589                                                                             \
3590   product(bool, UseSharedSpaces, true,                                      \
3591           "Use shared spaces for metadata")                                 \
3592                                                                             \
3593   product(bool, RequireSharedSpaces, false,                                 \
3594           "Require shared spaces for metadata")                             \
3595                                                                             \
3596   product(bool, DumpSharedSpaces, false,                                    \
3597            "Special mode: JVM reads a class list, loads classes, builds "   \
3598             "shared spaces, and dumps the shared spaces to a file to be "   \
3599             "used in future JVM runs.")                                     \
3600                                                                             \
3601   product(bool, PrintSharedSpaces, false,                                   \
3602           "Print usage of shared spaces")                                   \
3603                                                                             \
3604   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3605           "Size of read-write space for metadata (in bytes)")               \
3606                                                                             \
3607   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3608           "Size of read-only space for metadata (in bytes)")                \
3609                                                                             \
3610   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3611           "Size of the shared miscellaneous data area (in bytes)")          \
3612                                                                             \
3613   product(uintx, SharedMiscCodeSize,    120*K,                              \
3614           "Size of the shared miscellaneous code area (in bytes)")          \
3615                                                                             \
3616   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3617           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3618           "Address to allocate shared memory region for class data")        \
3619                                                                             \
3620   diagnostic(bool, EnableInvokeDynamic, true,                               \
3621           "support JSR 292 (method handles, invokedynamic, "                \
3622           "anonymous classes")                                              \
3623                                                                             \
3624   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3625           "Print generated stub code for method handles")                   \
3626                                                                             \
3627   develop(bool, TraceMethodHandles, false,                                  \
3628           "trace internal method handle operations")                        \
3629                                                                             \
3630   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3631           "perform extra checks when constructing method handles")          \
3632                                                                             \
3633   diagnostic(bool, ShowHiddenFrames, false,                                 \
3634           "show method handle implementation frames (usually hidden)")      \
3635                                                                             \
3636   experimental(bool, TrustFinalNonStaticFields, false,                      \
3637           "trust final non-static declarations for constant folding")       \
3638                                                                             \
3639   experimental(bool, FoldStableValues, true,                                \
3640           "Private flag to control optimizations for stable variables")     \
3641                                                                             \
3642   develop(bool, VerifyStable, true,                                         \
3643           "Verify stable property (0/NULL => non_0/non_NULL)")              \
3644                                                                             \
3645   develop(bool, TraceStableFieldUpdates, true,                              \
3646           "Trace updates to stable fields")                                 \
3647                                                                             \
3648   develop(bool, TraceInvokeDynamic, false,                                  \
3649           "trace internal invoke dynamic operations")                       \
3650                                                                             \
3651   diagnostic(bool, PauseAtStartup,      false,                              \
3652           "Causes the VM to pause at startup time and wait for the pause "  \
3653           "file to be removed (default: ./vm.paused.<pid>)")                \
3654                                                                             \
3655   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3656           "The file to create and for whose removal to await when pausing " \
3657           "at startup. (default: ./vm.paused.<pid>)")                       \
3658                                                                             \
3659   diagnostic(bool, PauseAtExit, false,                                      \
3660           "Pause and wait for keypress on exit if a debugger is attached")  \
3661                                                                             \
3662   product(bool, ExtendedDTraceProbes,    false,                             \
3663           "Enable performance-impacting dtrace probes")                     \
3664                                                                             \
3665   product(bool, DTraceMethodProbes, false,                                  \
3666           "Enable dtrace probes for method-entry and method-exit")          \
3667                                                                             \
3668   product(bool, DTraceAllocProbes, false,                                   \
3669           "Enable dtrace probes for object allocation")                     \
3670                                                                             \
3671   product(bool, DTraceMonitorProbes, false,                                 \
3672           "Enable dtrace probes for monitor events")                        \
3673                                                                             \
3674   product(bool, RelaxAccessControlCheck, false,                             \
3675           "Relax the access control checks in the verifier")                \
3676                                                                             \
3677   diagnostic(bool, PrintDTraceDOF, false,                                   \
3678              "Print the DTrace DOF passed to the system for JSDT probes")   \
3679                                                                             \
3680   product(uintx, StringTableSize, defaultStringTableSize,                   \
3681           "Number of buckets in the interned String table")                 \
3682                                                                             \
3683   develop(bool, TraceDefaultMethods, false,                                 \
3684           "Trace the default method processing steps")                      \
3685                                                                             \
3686   develop(bool, ParseAllGenericSignatures, false,                           \
3687           "Parse all generic signatures while classloading")                \
3688                                                                             \
3689   develop(bool, VerifyGenericSignatures, false,                             \
3690           "Abort VM on erroneous or inconsistent generic signatures")       \
3691                                                                             \
3692   product(bool, ParseGenericDefaults, false,                                \
3693           "Parse generic signatures for default method handling")           \
3694                                                                             \
3695   product(bool, UseVMInterruptibleIO, false,                                \
3696           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3697           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3698           " of this flag is true for JDK 6 and earlier")                    \
3699                                                                             \
3700   diagnostic(bool, WhiteBoxAPI, false,                                      \
3701           "Enable internal testing APIs")                                   \
3702                                                                             \
3703   product(bool, PrintGCCause, true,                                         \
3704           "Include GC cause in GC logging")                                 \
3705                                                                             \
3706   product(bool , AllowNonVirtualCalls, false,                               \
3707           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3708                                                                             \
3709   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3710           "Override the default location of the CDS archive file")          \
3711                                                                             \
3712   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3713           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3714           "Allocation less than this value will be allocated "              \
3715           "using malloc. Larger allocations will use mmap.")                \
3716                                                                             \
3717   product(bool, EnableTracing, false,                                       \
3718           "Enable event-based tracing")                                     \
3719   product(bool, UseLockedTracing, false,                                    \
3720           "Use locked-tracing when doing event-based tracing")
3721 
3722 
3723 /*
3724  *  Macros for factoring of globals
3725  */
3726 
3727 // Interface macros
3728 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3729 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3730 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3731 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3732 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3733 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3734 #ifdef PRODUCT
3735 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3736 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3737 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3738 #else
3739 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3740 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3741 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3742 #endif
3743 // Special LP64 flags, product only needed for now.
3744 #ifdef _LP64
3745 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3746 #else
3747 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3748 #endif // _LP64
3749 
3750 // Implementation macros
3751 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3752 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3753 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3754 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3755 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3756 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3757 #ifdef PRODUCT
3758 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3759 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3760 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3761 #else
3762 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3763 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3764 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3765 #endif
3766 #ifdef _LP64
3767 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3768 #else
3769 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3770 #endif // _LP64
3771 
3772 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)
3773 
3774 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3775 
3776 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3777 
3778 // Extensions
3779 
3780 #include "runtime/globals_ext.hpp"
3781 
3782 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP
--- EOF ---