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 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, CMSParallelInitialMarkEnabled, true,                        \
1693           "Use the parallel initial mark.")                                 \
1694                                                                             \
1695   product(bool, CMSParallelRemarkEnabled, true,                             \
1696           "Whether parallel remark enabled (only if ParNewGC)")             \
1697                                                                             \
1698   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1699           "Whether parallel remark of survivor space"                       \
1700           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1701                                                                             \
1702   product(bool, CMSPLABRecordAlways, true,                                  \
1703           "Whether to always record survivor space PLAB bdries"             \
1704           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1705                                                                             \
1706   product(bool, CMSEdenChunksRecordAlways, true,                            \
1707           "Whether to always record eden chunks used for "                  \
1708           "the parallel initial mark or remark of eden" )                   \
1709                                                                             \
1710   product(bool, CMSPrintEdenSurvivorChunks, false,                          \
1711           "Print the eden and the survivor chunks used for the parallel "   \
1712           "initial mark or remark of the eden/survivor spaces")             \
1713                                                                             \
1714   product(bool, CMSConcurrentMTEnabled, true,                               \
1715           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1716                                                                             \
1717   product(bool, CMSPrecleaningEnabled, true,                                \
1718           "Whether concurrent precleaning enabled")                         \
1719                                                                             \
1720   product(uintx, CMSPrecleanIter, 3,                                        \
1721           "Maximum number of precleaning iteration passes")                 \
1722                                                                             \
1723   product(uintx, CMSPrecleanNumerator, 2,                                   \
1724           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1725           " ratio")                                                         \
1726                                                                             \
1727   product(uintx, CMSPrecleanDenominator, 3,                                 \
1728           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1729           " ratio")                                                         \
1730                                                                             \
1731   product(bool, CMSPrecleanRefLists1, true,                                 \
1732           "Preclean ref lists during (initial) preclean phase")             \
1733                                                                             \
1734   product(bool, CMSPrecleanRefLists2, false,                                \
1735           "Preclean ref lists during abortable preclean phase")             \
1736                                                                             \
1737   product(bool, CMSPrecleanSurvivors1, false,                               \
1738           "Preclean survivors during (initial) preclean phase")             \
1739                                                                             \
1740   product(bool, CMSPrecleanSurvivors2, true,                                \
1741           "Preclean survivors during abortable preclean phase")             \
1742                                                                             \
1743   product(uintx, CMSPrecleanThreshold, 1000,                                \
1744           "Don't re-iterate if #dirty cards less than this")                \
1745                                                                             \
1746   product(bool, CMSCleanOnEnter, true,                                      \
1747           "Clean-on-enter optimization for reducing number of dirty cards") \
1748                                                                             \
1749   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1750           "Choose variant (1,2) of verification following remark")          \
1751                                                                             \
1752   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1753           "If Eden used is below this value, don't try to schedule remark") \
1754                                                                             \
1755   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1756           "The Eden occupancy % at which to try and schedule remark pause") \
1757                                                                             \
1758   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1759           "Start sampling Eden top at least before yg occupancy reaches"    \
1760           " 1/<ratio> of the size at which we plan to schedule remark")     \
1761                                                                             \
1762   product(uintx, CMSSamplingGrain, 16*K,                                    \
1763           "The minimum distance between eden samples for CMS (see above)")  \
1764                                                                             \
1765   product(bool, CMSScavengeBeforeRemark, false,                             \
1766           "Attempt scavenge before the CMS remark step")                    \
1767                                                                             \
1768   develop(bool, CMSTraceSweeper, false,                                     \
1769           "Trace some actions of the CMS sweeper")                          \
1770                                                                             \
1771   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1772           "Don't drain below this size per parallel worker/thief")          \
1773                                                                             \
1774   manageable(intx, CMSWaitDuration, 2000,                                   \
1775           "Time in milliseconds that CMS thread waits for young GC")        \
1776                                                                             \
1777   develop(uintx, CMSCheckInterval, 1000,                                    \
1778           "Interval in milliseconds that CMS thread checks if it "          \
1779           "should start a collection cycle")                                \
1780                                                                             \
1781   product(bool, CMSYield, true,                                             \
1782           "Yield between steps of concurrent mark & sweep")                 \
1783                                                                             \
1784   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1785           "Bitmap operations should process at most this many bits"         \
1786           "between yields")                                                 \
1787                                                                             \
1788   product(bool, CMSDumpAtPromotionFailure, false,                           \
1789           "Dump useful information about the state of the CMS old "         \
1790           " generation upon a promotion failure.")                          \
1791                                                                             \
1792   product(bool, CMSPrintChunksInDump, false,                                \
1793           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1794           " more detailed information about the free chunks.")              \
1795                                                                             \
1796   product(bool, CMSPrintObjectsInDump, false,                               \
1797           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1798           " more detailed information about the allocated objects.")        \
1799                                                                             \
1800   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1801           "Verify that all refs across the FLS boundary "                   \
1802           " are to valid objects")                                          \
1803                                                                             \
1804   diagnostic(bool, FLSVerifyLists, false,                                   \
1805           "Do lots of (expensive) FreeListSpace verification")              \
1806                                                                             \
1807   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1808           "Do lots of (expensive) FLS index table verification")            \
1809                                                                             \
1810   develop(bool, FLSVerifyDictionary, false,                                 \
1811           "Do lots of (expensive) FLS dictionary verification")             \
1812                                                                             \
1813   develop(bool, VerifyBlockOffsetArray, false,                              \
1814           "Do (expensive!) block offset array verification")                \
1815                                                                             \
1816   diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false,              \
1817           "Maintain _unallocated_block in BlockOffsetArray"                 \
1818           " (currently applicable only to CMS collector)")                  \
1819                                                                             \
1820   develop(bool, TraceCMSState, false,                                       \
1821           "Trace the state of the CMS collection")                          \
1822                                                                             \
1823   product(intx, RefDiscoveryPolicy, 0,                                      \
1824           "Whether reference-based(0) or referent-based(1)")                \
1825                                                                             \
1826   product(bool, ParallelRefProcEnabled, false,                              \
1827           "Enable parallel reference processing whenever possible")         \
1828                                                                             \
1829   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1830           "Enable balancing of reference processing queues")                \
1831                                                                             \
1832   product(uintx, CMSTriggerRatio, 80,                                       \
1833           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1834           "allocated before a CMS collection cycle commences")              \
1835                                                                             \
1836   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1837           "Percentage CMS generation occupancy at which to "                \
1838           "initiate CMS collection for bootstrapping collection stats")     \
1839                                                                             \
1840   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1841           "Percentage CMS generation occupancy to start a CMS collection "  \
1842           "cycle. A negative value means that CMSTriggerRatio is used")     \
1843                                                                             \
1844   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1845           "Percentage of the (entire) heap occupancy to start a "           \
1846           "concurrent GC cycle. It is used by GCs that trigger a "          \
1847           "concurrent GC cycle based on the occupancy of the entire heap, " \
1848           "not just one of the generations (e.g., G1). A value of 0 "       \
1849           "denotes 'do constant GC cycles'.")                               \
1850                                                                             \
1851   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1852           "Only use occupancy as a crierion for starting a CMS collection") \
1853                                                                             \
1854   product(uintx, CMSIsTooFullPercentage, 98,                                \
1855           "An absolute ceiling above which CMS will always consider the "   \
1856           "unloading of classes when class unloading is enabled")           \
1857                                                                             \
1858   develop(bool, CMSTestInFreeList, false,                                   \
1859           "Check if the coalesced range is already in the "                 \
1860           "free lists as claimed")                                          \
1861                                                                             \
1862   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1863           "Check that all the garbage collected was returned to the "       \
1864           "free lists.")                                                    \
1865                                                                             \
1866   notproduct(bool, ScavengeALot, false,                                     \
1867           "Force scavenge at every Nth exit from the runtime system "       \
1868           "(N=ScavengeALotInterval)")                                       \
1869                                                                             \
1870   develop(bool, FullGCALot, false,                                          \
1871           "Force full gc at every Nth exit from the runtime system "        \
1872           "(N=FullGCALotInterval)")                                         \
1873                                                                             \
1874   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1875           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1876                                                                             \
1877   product(bool, PrintPromotionFailure, false,                               \
1878           "Print additional diagnostic information following "              \
1879           " promotion failure")                                             \
1880                                                                             \
1881   notproduct(bool, PromotionFailureALot, false,                             \
1882           "Use promotion failure handling on every youngest generation "    \
1883           "collection")                                                     \
1884                                                                             \
1885   develop(uintx, PromotionFailureALotCount, 1000,                           \
1886           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1887           "refill attempts (ParNew) or promotion attempts "                 \
1888           "(other young collectors) ")                                      \
1889                                                                             \
1890   develop(uintx, PromotionFailureALotInterval, 5,                           \
1891           "Total collections between promotion failures alot")              \
1892                                                                             \
1893   experimental(uintx, WorkStealingSleepMillis, 1,                           \
1894           "Sleep time when sleep is used for yields")                       \
1895                                                                             \
1896   experimental(uintx, WorkStealingYieldsBeforeSleep, 5000,                  \
1897           "Number of yields before a sleep is done during workstealing")    \
1898                                                                             \
1899   experimental(uintx, WorkStealingHardSpins, 4096,                          \
1900           "Number of iterations in a spin loop between checks on "          \
1901           "time out of hard spin")                                          \
1902                                                                             \
1903   experimental(uintx, WorkStealingSpinToYieldRatio, 10,                     \
1904           "Ratio of hard spins to calls to yield")                          \
1905                                                                             \
1906   develop(uintx, ObjArrayMarkingStride, 512,                                \
1907           "Number of ObjArray elements to push onto the marking stack"      \
1908           "before pushing a continuation entry")                            \
1909                                                                             \
1910   develop(bool, MetadataAllocationFailALot, false,                          \
1911           "Fail metadata allocations at intervals controlled by "           \
1912           "MetadataAllocationFailALotInterval")                             \
1913                                                                             \
1914   develop(uintx, MetadataAllocationFailALotInterval, 1000,                  \
1915           "metadata allocation failure alot interval")                      \
1916                                                                             \
1917   develop(bool, MetaDataDeallocateALot, false,                              \
1918           "Deallocation bunches of metadata at intervals controlled by "    \
1919           "MetaDataAllocateALotInterval")                                   \
1920                                                                             \
1921   develop(uintx, MetaDataDeallocateALotInterval, 100,                       \
1922           "Metadata deallocation alot interval")                            \
1923                                                                             \
1924   develop(bool, TraceMetadataChunkAllocation, false,                        \
1925           "Trace chunk metadata allocations")                               \
1926                                                                             \
1927   product(bool, TraceMetadataHumongousAllocation, false,                    \
1928           "Trace humongous metadata allocations")                           \
1929                                                                             \
1930   develop(bool, TraceMetavirtualspaceAllocation, false,                     \
1931           "Trace virtual space metadata allocations")                       \
1932                                                                             \
1933   notproduct(bool, ExecuteInternalVMTests, false,                           \
1934           "Enable execution of internal VM tests.")                         \
1935                                                                             \
1936   notproduct(bool, VerboseInternalVMTests, false,                           \
1937           "Turn on logging for internal VM tests.")                         \
1938                                                                             \
1939   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1940                                                                             \
1941   product_pd(bool, ResizeTLAB,                                              \
1942           "Dynamically resize tlab size for threads")                       \
1943                                                                             \
1944   product(bool, ZeroTLAB, false,                                            \
1945           "Zero out the newly created TLAB")                                \
1946                                                                             \
1947   product(bool, FastTLABRefill, true,                                       \
1948           "Use fast TLAB refill code")                                      \
1949                                                                             \
1950   product(bool, PrintTLAB, false,                                           \
1951           "Print various TLAB related information")                         \
1952                                                                             \
1953   product(bool, TLABStats, true,                                            \
1954           "Print various TLAB related information")                         \
1955                                                                             \
1956   EMBEDDED_ONLY(product(bool, LowMemoryProtection, true,                    \
1957           "Enable LowMemoryProtection"))                                    \
1958                                                                             \
1959   product_pd(bool, NeverActAsServerClassMachine,                            \
1960           "Never act like a server-class machine")                          \
1961                                                                             \
1962   product(bool, AlwaysActAsServerClassMachine, false,                       \
1963           "Always act like a server-class machine")                         \
1964                                                                             \
1965   product_pd(uint64_t, MaxRAM,                                              \
1966           "Real memory size (in bytes) used to set maximum heap size")      \
1967                                                                             \
1968   product(uintx, ErgoHeapSizeLimit, 0,                                      \
1969           "Maximum ergonomically set heap size (in bytes); zero means use " \
1970           "MaxRAM / MaxRAMFraction")                                        \
1971                                                                             \
1972   product(uintx, MaxRAMFraction, 4,                                         \
1973           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1974           "size")                                                           \
1975                                                                             \
1976   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1977           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1978           "size; deprecated: to be renamed to MaxRAMFraction")              \
1979                                                                             \
1980   product(uintx, MinRAMFraction, 2,                                         \
1981           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
1982           "size on systems with small physical memory size")                \
1983                                                                             \
1984   product(uintx, InitialRAMFraction, 64,                                    \
1985           "Fraction (1/n) of real memory used for initial heap size")       \
1986                                                                             \
1987   develop(uintx, MaxVirtMemFraction, 2,                                     \
1988           "Maximum fraction (1/n) of virtual memory used for ergonomically" \
1989           "determining maximum heap size")                                  \
1990                                                                             \
1991   product(bool, UseAutoGCSelectPolicy, false,                               \
1992           "Use automatic collection selection policy")                      \
1993                                                                             \
1994   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1995           "Automatic GC selection pause threshhold in ms")                  \
1996                                                                             \
1997   product(bool, UseAdaptiveSizePolicy, true,                                \
1998           "Use adaptive generation sizing policies")                        \
1999                                                                             \
2000   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
2001           "Use adaptive survivor sizing policies")                          \
2002                                                                             \
2003   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
2004           "Use adaptive young-old sizing policies at minor collections")    \
2005                                                                             \
2006   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
2007           "Use adaptive young-old sizing policies at major collections")    \
2008                                                                             \
2009   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
2010           "Use statistics from System.GC for adaptive size policy")         \
2011                                                                             \
2012   product(bool, UseAdaptiveGCBoundary, false,                               \
2013           "Allow young-old boundary to move")                               \
2014                                                                             \
2015   develop(bool, TraceAdaptiveGCBoundary, false,                             \
2016           "Trace young-old boundary moves")                                 \
2017                                                                             \
2018   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
2019           "Resize the virtual spaces of the young or old generations")      \
2020                                                                             \
2021   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
2022           "Policy for changeing generation size for throughput goals")      \
2023                                                                             \
2024   product(uintx, AdaptiveSizePausePolicy, 0,                                \
2025           "Policy for changing generation size for pause goals")            \
2026                                                                             \
2027   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
2028           "Adjust tenured generation to achive a minor pause goal")         \
2029                                                                             \
2030   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
2031           "Adjust young generation to achive a major pause goal")           \
2032                                                                             \
2033   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
2034           "Number of steps where heuristics is used before data is used")   \
2035                                                                             \
2036   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
2037           "Number of collections before the adaptive sizing is started")    \
2038                                                                             \
2039   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
2040           "Collection interval for printing information; zero means never") \
2041                                                                             \
2042   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
2043           "Use adaptive minimum footprint as a goal")                       \
2044                                                                             \
2045   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
2046           "Weight given to exponential resizing, between 0 and 100")        \
2047                                                                             \
2048   product(uintx, AdaptiveTimeWeight,       25,                              \
2049           "Weight given to time in adaptive policy, between 0 and 100")     \
2050                                                                             \
2051   product(uintx, PausePadding, 1,                                           \
2052           "How much buffer to keep for pause time")                         \
2053                                                                             \
2054   product(uintx, PromotedPadding, 3,                                        \
2055           "How much buffer to keep for promotion failure")                  \
2056                                                                             \
2057   product(uintx, SurvivorPadding, 3,                                        \
2058           "How much buffer to keep for survivor overflow")                  \
2059                                                                             \
2060   product(uintx, ThresholdTolerance, 10,                                    \
2061           "Allowed collection cost difference between generations")         \
2062                                                                             \
2063   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
2064           "If collection costs are within margin, reduce both by full "     \
2065           "delta")                                                          \
2066                                                                             \
2067   product(uintx, YoungGenerationSizeIncrement, 20,                          \
2068           "Adaptive size percentage change in young generation")            \
2069                                                                             \
2070   product(uintx, YoungGenerationSizeSupplement, 80,                         \
2071           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
2072                                                                             \
2073   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
2074           "Decay factor to YoungedGenerationSizeSupplement")                \
2075                                                                             \
2076   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
2077           "Adaptive size percentage change in tenured generation")          \
2078                                                                             \
2079   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
2080           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
2081                                                                             \
2082   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
2083           "Decay factor to TenuredGenerationSizeIncrement")                 \
2084                                                                             \
2085   product(uintx, MaxGCPauseMillis, max_uintx,                               \
2086           "Adaptive size policy maximum GC pause time goal in msec, "       \
2087           "or (G1 Only) the max. GC time per MMU time slice")               \
2088                                                                             \
2089   product(uintx, GCPauseIntervalMillis, 0,                                  \
2090           "Time slice for MMU specification")                               \
2091                                                                             \
2092   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
2093           "Adaptive size policy maximum GC minor pause time goal in msec")  \
2094                                                                             \
2095   product(uintx, GCTimeRatio, 99,                                           \
2096           "Adaptive size policy application time to GC time ratio")         \
2097                                                                             \
2098   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
2099           "Adaptive size scale down factor for shrinking")                  \
2100                                                                             \
2101   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
2102           "Adaptive size decays the major cost for long major intervals")   \
2103                                                                             \
2104   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
2105           "Time scale over which major costs decay")                        \
2106                                                                             \
2107   product(uintx, MinSurvivorRatio, 3,                                       \
2108           "Minimum ratio of young generation/survivor space size")          \
2109                                                                             \
2110   product(uintx, InitialSurvivorRatio, 8,                                   \
2111           "Initial ratio of eden/survivor space size")                      \
2112                                                                             \
2113   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2114           "Estimate of footprint other than Java Heap")                     \
2115                                                                             \
2116   product(bool, UseGCOverheadLimit, true,                                   \
2117           "Use policy to limit of proportion of time spent in GC "          \
2118           "before an OutOfMemory error is thrown")                          \
2119                                                                             \
2120   product(uintx, GCTimeLimit, 98,                                           \
2121           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2122           "error is thrown (used with GCHeapFreeLimit)")                    \
2123                                                                             \
2124   product(uintx, GCHeapFreeLimit, 2,                                        \
2125           "Minimum percentage of free space after a full GC before an "     \
2126           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2127                                                                             \
2128   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2129           "Number of consecutive collections before gc time limit fires")   \
2130                                                                             \
2131   product(bool, PrintAdaptiveSizePolicy, false,                             \
2132           "Print information about AdaptiveSizePolicy")                     \
2133                                                                             \
2134   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2135           "How far ahead to prefetch destination area (<= 0 means off)")    \
2136                                                                             \
2137   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2138           "How far ahead to prefetch scan area (<= 0 means off)")           \
2139                                                                             \
2140   product(intx, PrefetchFieldsAhead, -1,                                    \
2141           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2142                                                                             \
2143   diagnostic(bool, VerifySilently, false,                                   \
2144           "Don't print print the verification progress")                    \
2145                                                                             \
2146   diagnostic(bool, VerifyDuringStartup, false,                              \
2147           "Verify memory system before executing any Java code "            \
2148           "during VM initialization")                                       \
2149                                                                             \
2150   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2151           "Verify system before exiting")                                   \
2152                                                                             \
2153   diagnostic(bool, VerifyBeforeGC, false,                                   \
2154           "Verify memory system before GC")                                 \
2155                                                                             \
2156   diagnostic(bool, VerifyAfterGC, false,                                    \
2157           "Verify memory system after GC")                                  \
2158                                                                             \
2159   diagnostic(bool, VerifyDuringGC, false,                                   \
2160           "Verify memory system during GC (between phases)")                \
2161                                                                             \
2162   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2163           "Enable parallel memory system verification")                     \
2164                                                                             \
2165   diagnostic(bool, DeferInitialCardMark, false,                             \
2166           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2167            "may arise from new_pre_store_barrier")                          \
2168                                                                             \
2169   diagnostic(bool, VerifyRememberedSets, false,                             \
2170           "Verify GC remembered sets")                                      \
2171                                                                             \
2172   diagnostic(bool, VerifyObjectStartArray, true,                            \
2173           "Verify GC object start array if verify before/after")            \
2174                                                                             \
2175   product(bool, DisableExplicitGC, false,                                   \
2176           "Tells whether calling System.gc() does a full GC")               \
2177                                                                             \
2178   notproduct(bool, CheckMemoryInitialization, false,                        \
2179           "Checks memory initialization")                                   \
2180                                                                             \
2181   product(bool, CollectGen0First, false,                                    \
2182           "Collect youngest generation before each full GC")                \
2183                                                                             \
2184   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2185           "Bind CMS Thread to CPU if possible")                             \
2186                                                                             \
2187   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2188           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2189                                                                             \
2190   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2191           "Bind GCTaskThreads to CPUs if possible")                         \
2192                                                                             \
2193   product(bool, UseGCTaskAffinity, false,                                   \
2194           "Use worker affinity when asking for GCTasks")                    \
2195                                                                             \
2196   product(uintx, ProcessDistributionStride, 4,                              \
2197           "Stride through processors when distributing processes")          \
2198                                                                             \
2199   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2200           "number of times the coordinator GC thread will sleep while "     \
2201           "yielding before giving up and resuming GC")                      \
2202                                                                             \
2203   product(uintx, CMSYieldSleepCount, 0,                                     \
2204           "number of times a GC thread (minus the coordinator) "            \
2205           "will sleep while yielding before giving up and resuming GC")     \
2206                                                                             \
2207   /* gc tracing */                                                          \
2208   manageable(bool, PrintGC, false,                                          \
2209           "Print message at garbage collect")                               \
2210                                                                             \
2211   manageable(bool, PrintGCDetails, false,                                   \
2212           "Print more details at garbage collect")                          \
2213                                                                             \
2214   manageable(bool, PrintGCDateStamps, false,                                \
2215           "Print date stamps at garbage collect")                           \
2216                                                                             \
2217   manageable(bool, PrintGCTimeStamps, false,                                \
2218           "Print timestamps at garbage collect")                            \
2219                                                                             \
2220   product(bool, PrintGCTaskTimeStamps, false,                               \
2221           "Print timestamps for individual gc worker thread tasks")         \
2222                                                                             \
2223   develop(intx, ConcGCYieldTimeout, 0,                                      \
2224           "If non-zero, assert that GC threads yield within this # of ms.") \
2225                                                                             \
2226   notproduct(bool, TraceMarkSweep, false,                                   \
2227           "Trace mark sweep")                                               \
2228                                                                             \
2229   product(bool, PrintReferenceGC, false,                                    \
2230           "Print times spent handling reference objects during GC "         \
2231           " (enabled only when PrintGCDetails)")                            \
2232                                                                             \
2233   develop(bool, TraceReferenceGC, false,                                    \
2234           "Trace handling of soft/weak/final/phantom references")           \
2235                                                                             \
2236   develop(bool, TraceFinalizerRegistration, false,                          \
2237          "Trace registration of final references")                          \
2238                                                                             \
2239   notproduct(bool, TraceScavenge, false,                                    \
2240           "Trace scavenge")                                                 \
2241                                                                             \
2242   product_rw(bool, TraceClassLoading, false,                                \
2243           "Trace all classes loaded")                                       \
2244                                                                             \
2245   product(bool, TraceClassLoadingPreorder, false,                           \
2246           "Trace all classes loaded in order referenced (not loaded)")      \
2247                                                                             \
2248   product_rw(bool, TraceClassUnloading, false,                              \
2249           "Trace unloading of classes")                                     \
2250                                                                             \
2251   product_rw(bool, TraceLoaderConstraints, false,                           \
2252           "Trace loader constraints")                                       \
2253                                                                             \
2254   develop(bool, TraceClassLoaderData, false,                                \
2255           "Trace class loader loader_data lifetime")                        \
2256                                                                             \
2257   product(uintx, InitialBootClassLoaderMetaspaceSize,                       \
2258           NOT_LP64(2200*K) LP64_ONLY(4*M),                                  \
2259           "Initial size of the boot class loader data metaspace")           \
2260                                                                             \
2261   product(bool, TraceGen0Time, false,                                       \
2262           "Trace accumulated time for Gen 0 collection")                    \
2263                                                                             \
2264   product(bool, TraceGen1Time, false,                                       \
2265           "Trace accumulated time for Gen 1 collection")                    \
2266                                                                             \
2267   product(bool, PrintTenuringDistribution, false,                           \
2268           "Print tenuring age information")                                 \
2269                                                                             \
2270   product_rw(bool, PrintHeapAtGC, false,                                    \
2271           "Print heap layout before and after each GC")                     \
2272                                                                             \
2273   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2274           "Prints extended information about the layout of the heap "       \
2275           "when -XX:+PrintHeapAtGC is set")                                 \
2276                                                                             \
2277   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2278           "Print heap layout in response to SIGBREAK")                      \
2279                                                                             \
2280   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2281           "Print a class histogram before any major stop-world GC")         \
2282                                                                             \
2283   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2284           "Print a class histogram after any major stop-world GC")          \
2285                                                                             \
2286   manageable(bool, PrintClassHistogram, false,                              \
2287           "Print a histogram of class instances")                           \
2288                                                                             \
2289   develop(bool, TraceWorkGang, false,                                       \
2290           "Trace activities of work gangs")                                 \
2291                                                                             \
2292   product(bool, TraceParallelOldGCTasks, false,                             \
2293           "Trace multithreaded GC activity")                                \
2294                                                                             \
2295   develop(bool, TraceBlockOffsetTable, false,                               \
2296           "Print BlockOffsetTable maps")                                    \
2297                                                                             \
2298   develop(bool, TraceCardTableModRefBS, false,                              \
2299           "Print CardTableModRefBS maps")                                   \
2300                                                                             \
2301   develop(bool, TraceGCTaskManager, false,                                  \
2302           "Trace actions of the GC task manager")                           \
2303                                                                             \
2304   develop(bool, TraceGCTaskQueue, false,                                    \
2305           "Trace actions of the GC task queues")                            \
2306                                                                             \
2307   diagnostic(bool, TraceGCTaskThread, false,                                \
2308           "Trace actions of the GC task threads")                           \
2309                                                                             \
2310   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2311           "Print the time taken by each parallel old gc phase."             \
2312           "PrintGCDetails must also be enabled.")                           \
2313                                                                             \
2314   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2315           "Trace parallel old gc marking phase")                            \
2316                                                                             \
2317   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2318           "Trace parallel old gc summary phase")                            \
2319                                                                             \
2320   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2321           "Trace parallel old gc compaction phase")                         \
2322                                                                             \
2323   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2324           "Trace parallel old gc dense prefix computation")                 \
2325                                                                             \
2326   develop(bool, IgnoreLibthreadGPFault, false,                              \
2327           "Suppress workaround for libthread GP fault")                     \
2328                                                                             \
2329   product(bool, PrintJNIGCStalls, false,                                    \
2330           "Print diagnostic message when GC is stalled"                     \
2331           "by JNI critical section")                                        \
2332                                                                             \
2333   experimental(double, ObjectCountCutOffPercent, 0.5,                       \
2334           "The percentage of the used heap that the instances of a class "  \
2335           "must occupy for the class to generate a trace event.")           \
2336                                                                             \
2337   /* GC log rotation setting */                                             \
2338                                                                             \
2339   product(bool, UseGCLogFileRotation, false,                                \
2340           "Prevent large gclog file for long running app. "                 \
2341           "Requires -Xloggc:<filename>")                                    \
2342                                                                             \
2343   product(uintx, NumberOfGCLogFiles, 0,                                     \
2344           "Number of gclog files in rotation, "                             \
2345           "Default: 0, no rotation")                                        \
2346                                                                             \
2347   product(uintx, GCLogFileSize, 0,                                          \
2348           "GC log file size, Default: 0 bytes, no rotation "                \
2349           "Only valid with UseGCLogFileRotation")                           \
2350                                                                             \
2351   /* JVMTI heap profiling */                                                \
2352                                                                             \
2353   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2354           "Trace JVMTI object tagging calls")                               \
2355                                                                             \
2356   diagnostic(bool, VerifyBeforeIteration, false,                            \
2357           "Verify memory system before JVMTI iteration")                    \
2358                                                                             \
2359   /* compiler interface */                                                  \
2360                                                                             \
2361   develop(bool, CIPrintCompilerName, false,                                 \
2362           "when CIPrint is active, print the name of the active compiler")  \
2363                                                                             \
2364   develop(bool, CIPrintCompileQueue, false,                                 \
2365           "display the contents of the compile queue whenever a "           \
2366           "compilation is enqueued")                                        \
2367                                                                             \
2368   develop(bool, CIPrintRequests, false,                                     \
2369           "display every request for compilation")                          \
2370                                                                             \
2371   product(bool, CITime, false,                                              \
2372           "collect timing information for compilation")                     \
2373                                                                             \
2374   develop(bool, CITimeEach, false,                                          \
2375           "display timing information after each successful compilation")   \
2376                                                                             \
2377   develop(bool, CICountOSR, false,                                          \
2378           "use a separate counter when assigning ids to osr compilations")  \
2379                                                                             \
2380   develop(bool, CICompileNatives, true,                                     \
2381           "compile native methods if supported by the compiler")            \
2382                                                                             \
2383   develop_pd(bool, CICompileOSR,                                            \
2384           "compile on stack replacement methods if supported by the "       \
2385           "compiler")                                                       \
2386                                                                             \
2387   develop(bool, CIPrintMethodCodes, false,                                  \
2388           "print method bytecodes of the compiled code")                    \
2389                                                                             \
2390   develop(bool, CIPrintTypeFlow, false,                                     \
2391           "print the results of ciTypeFlow analysis")                       \
2392                                                                             \
2393   develop(bool, CITraceTypeFlow, false,                                     \
2394           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2395                                                                             \
2396   develop(intx, OSROnlyBCI, -1,                                             \
2397           "OSR only at this bci.  Negative values mean exclude that bci")   \
2398                                                                             \
2399   /* compiler */                                                            \
2400                                                                             \
2401   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2402           "Number of compiler threads to run")                              \
2403                                                                             \
2404   product(intx, CompilationPolicyChoice, 0,                                 \
2405           "which compilation policy (0/1)")                                 \
2406                                                                             \
2407   develop(bool, UseStackBanging, true,                                      \
2408           "use stack banging for stack overflow checks (required for "      \
2409           "proper StackOverflow handling; disable only to measure cost "    \
2410           "of stackbanging)")                                               \
2411                                                                             \
2412   develop(bool, UseStrictFP, true,                                          \
2413           "use strict fp if modifier strictfp is set")                      \
2414                                                                             \
2415   develop(bool, GenerateSynchronizationCode, true,                          \
2416           "generate locking/unlocking code for synchronized methods and "   \
2417           "monitors")                                                       \
2418                                                                             \
2419   develop(bool, GenerateCompilerNullChecks, true,                           \
2420           "Generate explicit null checks for loads/stores/calls")           \
2421                                                                             \
2422   develop(bool, GenerateRangeChecks, true,                                  \
2423           "Generate range checks for array accesses")                       \
2424                                                                             \
2425   develop_pd(bool, ImplicitNullChecks,                                      \
2426           "generate code for implicit null checks")                         \
2427                                                                             \
2428   product(bool, PrintSafepointStatistics, false,                            \
2429           "print statistics about safepoint synchronization")               \
2430                                                                             \
2431   product(intx, PrintSafepointStatisticsCount, 300,                         \
2432           "total number of safepoint statistics collected "                 \
2433           "before printing them out")                                       \
2434                                                                             \
2435   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2436           "print safepoint statistics only when safepoint takes"            \
2437           " more than PrintSafepointSatisticsTimeout in millis")            \
2438                                                                             \
2439   product(bool, TraceSafepointCleanupTime, false,                           \
2440           "print the break down of clean up tasks performed during"         \
2441           " safepoint")                                                     \
2442                                                                             \
2443   product(bool, Inline, true,                                               \
2444           "enable inlining")                                                \
2445                                                                             \
2446   product(bool, ClipInlining, true,                                         \
2447           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2448                                                                             \
2449   develop(bool, UseCHA, true,                                               \
2450           "enable CHA")                                                     \
2451                                                                             \
2452   product(bool, UseTypeProfile, true,                                       \
2453           "Check interpreter profile for historically monomorphic calls")   \
2454                                                                             \
2455   notproduct(bool, TimeCompiler, false,                                     \
2456           "time the compiler")                                              \
2457                                                                             \
2458   diagnostic(bool, PrintInlining, false,                                    \
2459           "prints inlining optimizations")                                  \
2460                                                                             \
2461   product(bool, UsePopCountInstruction, false,                              \
2462           "Use population count instruction")                               \
2463                                                                             \
2464   develop(bool, EagerInitialization, false,                                 \
2465           "Eagerly initialize classes if possible")                         \
2466                                                                             \
2467   develop(bool, TraceMethodReplacement, false,                              \
2468           "Print when methods are replaced do to recompilation")            \
2469                                                                             \
2470   develop(bool, PrintMethodFlushing, false,                                 \
2471           "print the nmethods being flushed")                               \
2472                                                                             \
2473   develop(bool, UseRelocIndex, false,                                       \
2474          "use an index to speed random access to relocations")              \
2475                                                                             \
2476   develop(bool, StressCodeBuffers, false,                                   \
2477          "Exercise code buffer expansion and other rare state changes")     \
2478                                                                             \
2479   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2480          "Generate extra debugging info for non-safepoints in nmethods")    \
2481                                                                             \
2482   product(bool, PrintVMOptions, false,                                      \
2483          "Print flags that appeared on the command line")                   \
2484                                                                             \
2485   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2486          "Ignore unrecognized VM options")                                  \
2487                                                                             \
2488   product(bool, PrintCommandLineFlags, false,                               \
2489          "Print flags specified on command line or set by ergonomics")      \
2490                                                                             \
2491   product(bool, PrintFlagsInitial, false,                                   \
2492          "Print all VM flags before argument processing and exit VM")       \
2493                                                                             \
2494   product(bool, PrintFlagsFinal, false,                                     \
2495          "Print all VM flags after argument and ergonomic processing")      \
2496                                                                             \
2497   notproduct(bool, PrintFlagsWithComments, false,                           \
2498          "Print all VM flags with default values and descriptions and exit")\
2499                                                                             \
2500   diagnostic(bool, SerializeVMOutput, true,                                 \
2501          "Use a mutex to serialize output to tty and LogFile")              \
2502                                                                             \
2503   diagnostic(bool, DisplayVMOutput, true,                                   \
2504          "Display all VM output on the tty, independently of LogVMOutput")  \
2505                                                                             \
2506   diagnostic(bool, LogVMOutput, false,                                      \
2507          "Save VM output to LogFile")                                       \
2508                                                                             \
2509   diagnostic(ccstr, LogFile, NULL,                                          \
2510          "If LogVMOutput or LogCompilation is on, save VM output to "       \
2511          "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)") \
2512                                                                             \
2513   product(ccstr, ErrorFile, NULL,                                           \
2514          "If an error occurs, save the error data to this file "            \
2515          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2516                                                                             \
2517   product(bool, DisplayVMOutputToStderr, false,                             \
2518          "If DisplayVMOutput is true, display all VM output to stderr")     \
2519                                                                             \
2520   product(bool, DisplayVMOutputToStdout, false,                             \
2521          "If DisplayVMOutput is true, display all VM output to stdout")     \
2522                                                                             \
2523   product(bool, UseHeavyMonitors, false,                                    \
2524           "use heavyweight instead of lightweight Java monitors")           \
2525                                                                             \
2526   product(bool, PrintStringTableStatistics, false,                          \
2527           "print statistics about the StringTable and SymbolTable")         \
2528                                                                             \
2529   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2530           "print histogram of the symbol table")                            \
2531                                                                             \
2532   notproduct(bool, ExitVMOnVerifyError, false,                              \
2533           "standard exit from VM if bytecode verify error "                 \
2534           "(only in debug mode)")                                           \
2535                                                                             \
2536   notproduct(ccstr, AbortVMOnException, NULL,                               \
2537           "Call fatal if this exception is thrown.  Example: "              \
2538           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2539                                                                             \
2540   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2541           "Call fatal if the exception pointed by AbortVMOnException "      \
2542           "has this message.")                                              \
2543                                                                             \
2544   develop(bool, DebugVtables, false,                                        \
2545           "add debugging code to vtable dispatch")                          \
2546                                                                             \
2547   develop(bool, PrintVtables, false,                                        \
2548           "print vtables when printing klass")                              \
2549                                                                             \
2550   notproduct(bool, PrintVtableStats, false,                                 \
2551           "print vtables stats at end of run")                              \
2552                                                                             \
2553   develop(bool, TraceCreateZombies, false,                                  \
2554           "trace creation of zombie nmethods")                              \
2555                                                                             \
2556   notproduct(bool, IgnoreLockingAssertions, false,                          \
2557           "disable locking assertions (for speed)")                         \
2558                                                                             \
2559   product(bool, RangeCheckElimination, true,                                \
2560           "Eliminate range checks")                                         \
2561                                                                             \
2562   develop_pd(bool, UncommonNullCast,                                        \
2563           "track occurrences of null in casts; adjust compiler tactics")    \
2564                                                                             \
2565   develop(bool, TypeProfileCasts,  true,                                    \
2566           "treat casts like calls for purposes of type profiling")          \
2567                                                                             \
2568   develop(bool, DelayCompilationDuringStartup, true,                        \
2569           "Delay invoking the compiler until main application class is "    \
2570           "loaded")                                                         \
2571                                                                             \
2572   develop(bool, CompileTheWorld, false,                                     \
2573           "Compile all methods in all classes in bootstrap class path "     \
2574           "(stress test)")                                                  \
2575                                                                             \
2576   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2577           "Preload all classes used by a class before start loading")       \
2578                                                                             \
2579   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2580           "Force a safepoint every n compiles so sweeper can keep up")      \
2581                                                                             \
2582   develop(bool, FillDelaySlots, true,                                       \
2583           "Fill delay slots (on SPARC only)")                               \
2584                                                                             \
2585   develop(bool, TimeLivenessAnalysis, false,                                \
2586           "Time computation of bytecode liveness analysis")                 \
2587                                                                             \
2588   develop(bool, TraceLivenessGen, false,                                    \
2589           "Trace the generation of liveness analysis information")          \
2590                                                                             \
2591   notproduct(bool, TraceLivenessQuery, false,                               \
2592           "Trace queries of liveness analysis information")                 \
2593                                                                             \
2594   notproduct(bool, CollectIndexSetStatistics, false,                        \
2595           "Collect information about IndexSets")                            \
2596                                                                             \
2597   develop(bool, UseLoopSafepoints, true,                                    \
2598           "Generate Safepoint nodes in every loop")                         \
2599                                                                             \
2600   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2601           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2602           "Inline allocations larger than this in doublewords must go slow")\
2603                                                                             \
2604   product(bool, AggressiveOpts, false,                                      \
2605           "Enable aggressive optimizations - see arguments.cpp")            \
2606                                                                             \
2607   /* statistics */                                                          \
2608   develop(bool, CountCompiledCalls, false,                                  \
2609           "counts method invocations")                                      \
2610                                                                             \
2611   notproduct(bool, CountRuntimeCalls, false,                                \
2612           "counts VM runtime calls")                                        \
2613                                                                             \
2614   develop(bool, CountJNICalls, false,                                       \
2615           "counts jni method invocations")                                  \
2616                                                                             \
2617   notproduct(bool, CountJVMCalls, false,                                    \
2618           "counts jvm method invocations")                                  \
2619                                                                             \
2620   notproduct(bool, CountRemovableExceptions, false,                         \
2621           "count exceptions that could be replaced by branches due to "     \
2622           "inlining")                                                       \
2623                                                                             \
2624   notproduct(bool, ICMissHistogram, false,                                  \
2625           "produce histogram of IC misses")                                 \
2626                                                                             \
2627   notproduct(bool, PrintClassStatistics, false,                             \
2628           "prints class statistics at end of run")                          \
2629                                                                             \
2630   notproduct(bool, PrintMethodStatistics, false,                            \
2631           "prints method statistics at end of run")                         \
2632                                                                             \
2633   /* interpreter */                                                         \
2634   develop(bool, ClearInterpreterLocals, false,                              \
2635           "Always clear local variables of interpreter activations upon "   \
2636           "entry")                                                          \
2637                                                                             \
2638   product_pd(bool, RewriteBytecodes,                                        \
2639           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2640                                                                             \
2641   product_pd(bool, RewriteFrequentPairs,                                    \
2642           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2643                                                                             \
2644   diagnostic(bool, PrintInterpreter, false,                                 \
2645           "Prints the generated interpreter code")                          \
2646                                                                             \
2647   product(bool, UseInterpreter, true,                                       \
2648           "Use interpreter for non-compiled methods")                       \
2649                                                                             \
2650   develop(bool, UseFastSignatureHandlers, true,                             \
2651           "Use fast signature handlers for native calls")                   \
2652                                                                             \
2653   product(bool, UseLoopCounter, true,                                       \
2654           "Increment invocation counter on backward branch")                \
2655                                                                             \
2656   product(bool, UseFastEmptyMethods, true,                                  \
2657           "Use fast method entry code for empty methods")                   \
2658                                                                             \
2659   product(bool, UseFastAccessorMethods, true,                               \
2660           "Use fast method entry code for accessor methods")                \
2661                                                                             \
2662   product_pd(bool, UseOnStackReplacement,                                   \
2663            "Use on stack replacement, calls runtime if invoc. counter "     \
2664            "overflows in loop")                                             \
2665                                                                             \
2666   notproduct(bool, TraceOnStackReplacement, false,                          \
2667           "Trace on stack replacement")                                     \
2668                                                                             \
2669   product_pd(bool, PreferInterpreterNativeStubs,                            \
2670           "Use always interpreter stubs for native methods invoked via "    \
2671           "interpreter")                                                    \
2672                                                                             \
2673   develop(bool, CountBytecodes, false,                                      \
2674           "Count number of bytecodes executed")                             \
2675                                                                             \
2676   develop(bool, PrintBytecodeHistogram, false,                              \
2677           "Print histogram of the executed bytecodes")                      \
2678                                                                             \
2679   develop(bool, PrintBytecodePairHistogram, false,                          \
2680           "Print histogram of the executed bytecode pairs")                 \
2681                                                                             \
2682   diagnostic(bool, PrintSignatureHandlers, false,                           \
2683           "Print code generated for native method signature handlers")      \
2684                                                                             \
2685   develop(bool, VerifyOops, false,                                          \
2686           "Do plausibility checks for oops")                                \
2687                                                                             \
2688   develop(bool, CheckUnhandledOops, false,                                  \
2689           "Check for unhandled oops in VM code")                            \
2690                                                                             \
2691   develop(bool, VerifyJNIFields, trueInDebug,                               \
2692           "Verify jfieldIDs for instance fields")                           \
2693                                                                             \
2694   notproduct(bool, VerifyJNIEnvThread, false,                               \
2695           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2696           "from JNI")                                                       \
2697                                                                             \
2698   develop(bool, VerifyFPU, false,                                           \
2699           "Verify FPU state (check for NaN's, etc.)")                       \
2700                                                                             \
2701   develop(bool, VerifyThread, false,                                        \
2702           "Watch the thread register for corruption (SPARC only)")          \
2703                                                                             \
2704   develop(bool, VerifyActivationFrameSize, false,                           \
2705           "Verify that activation frame didn't become smaller than its "    \
2706           "minimal size")                                                   \
2707                                                                             \
2708   develop(bool, TraceFrequencyInlining, false,                              \
2709           "Trace frequency based inlining")                                 \
2710                                                                             \
2711   develop_pd(bool, InlineIntrinsics,                                        \
2712            "Inline intrinsics that can be statically resolved")             \
2713                                                                             \
2714   product_pd(bool, ProfileInterpreter,                                      \
2715            "Profile at the bytecode level during interpretation")           \
2716                                                                             \
2717   develop_pd(bool, ProfileTraps,                                            \
2718           "Profile deoptimization traps at the bytecode level")             \
2719                                                                             \
2720   product(intx, ProfileMaturityPercentage, 20,                              \
2721           "number of method invocations/branches (expressed as % of "       \
2722           "CompileThreshold) before using the method's profile")            \
2723                                                                             \
2724   develop(bool, PrintMethodData, false,                                     \
2725            "Print the results of +ProfileInterpreter at end of run")        \
2726                                                                             \
2727   develop(bool, VerifyDataPointer, trueInDebug,                             \
2728           "Verify the method data pointer during interpreter profiling")    \
2729                                                                             \
2730   develop(bool, VerifyCompiledCode, false,                                  \
2731           "Include miscellaneous runtime verifications in nmethod code; "   \
2732           "default off because it disturbs nmethod size heuristics")        \
2733                                                                             \
2734   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2735           "Manually make GC thread crash then dump java stack trace;  "     \
2736           "Test only")                                                      \
2737                                                                             \
2738   /* compilation */                                                         \
2739   product(bool, UseCompiler, true,                                          \
2740           "use compilation")                                                \
2741                                                                             \
2742   develop(bool, TraceCompilationPolicy, false,                              \
2743           "Trace compilation policy")                                       \
2744                                                                             \
2745   develop(bool, TimeCompilationPolicy, false,                               \
2746           "Time the compilation policy")                                    \
2747                                                                             \
2748   product(bool, UseCounterDecay, true,                                      \
2749            "adjust recompilation counters")                                 \
2750                                                                             \
2751   develop(intx, CounterHalfLifeTime,    30,                                 \
2752           "half-life time of invocation counters (in secs)")                \
2753                                                                             \
2754   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2755           "Min. ms. between invocation of CounterDecay")                    \
2756                                                                             \
2757   product(bool, AlwaysCompileLoopMethods, false,                            \
2758           "when using recompilation, never interpret methods "              \
2759           "containing loops")                                               \
2760                                                                             \
2761   product(bool, DontCompileHugeMethods, true,                               \
2762           "don't compile methods > HugeMethodLimit")                        \
2763                                                                             \
2764   /* Bytecode escape analysis estimation. */                                \
2765   product(bool, EstimateArgEscape, true,                                    \
2766           "Analyze bytecodes to estimate escape state of arguments")        \
2767                                                                             \
2768   product(intx, BCEATraceLevel, 0,                                          \
2769           "How much tracing to do of bytecode escape analysis estimates")   \
2770                                                                             \
2771   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2772           "Maximum number of nested calls that are analyzed by BC EA.")     \
2773                                                                             \
2774   product(intx, MaxBCEAEstimateSize, 150,                                   \
2775           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2776                                                                             \
2777   product(intx,  AllocatePrefetchStyle, 1,                                  \
2778           "0 = no prefetch, "                                               \
2779           "1 = prefetch instructions for each allocation, "                 \
2780           "2 = use TLAB watermark to gate allocation prefetch, "            \
2781           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2782                                                                             \
2783   product(intx,  AllocatePrefetchDistance, -1,                              \
2784           "Distance to prefetch ahead of allocation pointer")               \
2785                                                                             \
2786   product(intx,  AllocatePrefetchLines, 3,                                  \
2787           "Number of lines to prefetch ahead of array allocation pointer")  \
2788                                                                             \
2789   product(intx,  AllocateInstancePrefetchLines, 1,                          \
2790           "Number of lines to prefetch ahead of instance allocation pointer") \
2791                                                                             \
2792   product(intx,  AllocatePrefetchStepSize, 16,                              \
2793           "Step size in bytes of sequential prefetch instructions")         \
2794                                                                             \
2795   product(intx,  AllocatePrefetchInstr, 0,                                  \
2796           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2797                                                                             \
2798   /* deoptimization */                                                      \
2799   develop(bool, TraceDeoptimization, false,                                 \
2800           "Trace deoptimization")                                           \
2801                                                                             \
2802   develop(bool, DebugDeoptimization, false,                                 \
2803           "Tracing various information while debugging deoptimization")     \
2804                                                                             \
2805   product(intx, SelfDestructTimer, 0,                                       \
2806           "Will cause VM to terminate after a given time (in minutes) "     \
2807           "(0 means off)")                                                  \
2808                                                                             \
2809   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2810           "Max. no. of lines in the stack trace for Java exceptions "       \
2811           "(0 means all)")                                                  \
2812                                                                             \
2813   NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000,          \
2814           "Guarantee a safepoint (at least) every so many milliseconds "    \
2815           "(0 means none)"))                                                \
2816                                                                             \
2817   EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0,               \
2818           "Guarantee a safepoint (at least) every so many milliseconds "    \
2819           "(0 means none)"))                                                \
2820                                                                             \
2821   product(intx, SafepointTimeoutDelay, 10000,                               \
2822           "Delay in milliseconds for option SafepointTimeout")              \
2823                                                                             \
2824   product(intx, NmethodSweepFraction, 16,                                   \
2825           "Number of invocations of sweeper to cover all nmethods")         \
2826                                                                             \
2827   product(intx, NmethodSweepCheckInterval, 5,                               \
2828           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2829                                                                             \
2830   notproduct(bool, LogSweeper, false,                                       \
2831             "Keep a ring buffer of sweeper activity")                       \
2832                                                                             \
2833   notproduct(intx, SweeperLogEntries, 1024,                                 \
2834             "Number of records in the ring buffer of sweeper activity")     \
2835                                                                             \
2836   notproduct(intx, MemProfilingInterval, 500,                               \
2837           "Time between each invocation of the MemProfiler")                \
2838                                                                             \
2839   develop(intx, MallocCatchPtr, -1,                                         \
2840           "Hit breakpoint when mallocing/freeing this pointer")             \
2841                                                                             \
2842   notproduct(intx, AssertRepeat, 1,                                         \
2843           "number of times to evaluate expression in assert "               \
2844           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2845                                                                             \
2846   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2847           "List of assertions (file:line) to muzzle")                       \
2848                                                                             \
2849   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2850           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2851           "is used")                                                        \
2852                                                                             \
2853   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2854           "Threshold for total handle allocation when "                     \
2855           "+TraceHandleAllocation is used")                                 \
2856                                                                             \
2857   develop(intx, StackPrintLimit, 100,                                       \
2858           "number of stack frames to print in VM-level stack dump")         \
2859                                                                             \
2860   notproduct(intx, MaxElementPrintSize, 256,                                \
2861           "maximum number of elements to print")                            \
2862                                                                             \
2863   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2864           "maximum number of subklasses to print when printing klass")      \
2865                                                                             \
2866   product(intx, MaxInlineLevel, 9,                                          \
2867           "maximum number of nested calls that are inlined")                \
2868                                                                             \
2869   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2870           "maximum number of nested recursive calls that are inlined")      \
2871                                                                             \
2872   product_pd(intx, InlineSmallCode,                                         \
2873           "Only inline already compiled methods if their code size is "     \
2874           "less than this")                                                 \
2875                                                                             \
2876   product(intx, MaxInlineSize, 35,                                          \
2877           "maximum bytecode size of a method to be inlined")                \
2878                                                                             \
2879   product_pd(intx, FreqInlineSize,                                          \
2880           "maximum bytecode size of a frequent method to be inlined")       \
2881                                                                             \
2882   product(intx, MaxTrivialSize, 6,                                          \
2883           "maximum bytecode size of a trivial method to be inlined")        \
2884                                                                             \
2885   product(intx, MinInliningThreshold, 250,                                  \
2886           "min. invocation count a method needs to have to be inlined")     \
2887                                                                             \
2888   develop(intx, MethodHistogramCutoff, 100,                                 \
2889           "cutoff value for method invoc. histogram (+CountCalls)")         \
2890                                                                             \
2891   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2892           "# of interpreted methods to show in profile")                    \
2893                                                                             \
2894   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2895           "# of compiled methods to show in profile")                       \
2896                                                                             \
2897   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2898           "# of stub methods to show in profile")                           \
2899                                                                             \
2900   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2901           "# of runtime stub nodes to show in profile")                     \
2902                                                                             \
2903   product(intx, ProfileIntervalsTicks, 100,                                 \
2904           "# of ticks between printing of interval profile "                \
2905           "(+ProfileIntervals)")                                            \
2906                                                                             \
2907   notproduct(intx, ScavengeALotInterval,     1,                             \
2908           "Interval between which scavenge will occur with +ScavengeALot")  \
2909                                                                             \
2910   notproduct(intx, FullGCALotInterval,     1,                               \
2911           "Interval between which full gc will occur with +FullGCALot")     \
2912                                                                             \
2913   notproduct(intx, FullGCALotStart,     0,                                  \
2914           "For which invocation to start FullGCAlot")                       \
2915                                                                             \
2916   notproduct(intx, FullGCALotDummies,  32*K,                                \
2917           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2918           "to move")                                                        \
2919                                                                             \
2920   develop(intx, DontYieldALotInterval,    10,                               \
2921           "Interval between which yields will be dropped (milliseconds)")   \
2922                                                                             \
2923   develop(intx, MinSleepInterval,     1,                                    \
2924           "Minimum sleep() interval (milliseconds) when "                   \
2925           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2926                                                                             \
2927   develop(intx, ProfilerPCTickThreshold,    15,                             \
2928           "Number of ticks in a PC buckets to be a hotspot")                \
2929                                                                             \
2930   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2931           "Number of exits until DeoptimizeALot kicks in")                  \
2932                                                                             \
2933   notproduct(intx, ZombieALotInterval,     5,                               \
2934           "Number of exits until ZombieALot kicks in")                      \
2935                                                                             \
2936   develop(bool, StressNonEntrant, false,                                    \
2937           "Mark nmethods non-entrant at registration")                      \
2938                                                                             \
2939   diagnostic(intx, MallocVerifyInterval,     0,                             \
2940           "if non-zero, verify C heap after every N calls to "              \
2941           "malloc/realloc/free")                                            \
2942                                                                             \
2943   diagnostic(intx, MallocVerifyStart,     0,                                \
2944           "if non-zero, start verifying C heap after Nth call to "          \
2945           "malloc/realloc/free")                                            \
2946                                                                             \
2947   diagnostic(uintx, MallocMaxTestWords,     0,                              \
2948           "if non-zero, max # of Words that malloc/realloc can allocate "   \
2949           "(for testing only)")                                             \
2950                                                                             \
2951   product(intx, TypeProfileWidth,     2,                                    \
2952           "number of receiver types to record in call/cast profile")        \
2953                                                                             \
2954   develop(intx, BciProfileWidth,      2,                                    \
2955           "number of return bci's to record in ret profile")                \
2956                                                                             \
2957   product(intx, PerMethodRecompilationCutoff, 400,                          \
2958           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2959                                                                             \
2960   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
2961           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2962                                                                             \
2963   product(intx, PerMethodTrapLimit,  100,                                   \
2964           "Limit on traps (of one kind) in a method (includes inlines)")    \
2965                                                                             \
2966   product(intx, PerBytecodeTrapLimit,  4,                                   \
2967           "Limit on traps (of one kind) at a particular BCI")               \
2968                                                                             \
2969   develop(intx, InlineFrequencyRatio,    20,                                \
2970           "Ratio of call site execution to caller method invocation")       \
2971                                                                             \
2972   develop_pd(intx, InlineFrequencyCount,                                    \
2973           "Count of call site execution necessary to trigger frequent "     \
2974           "inlining")                                                       \
2975                                                                             \
2976   develop(intx, InlineThrowCount,    50,                                    \
2977           "Force inlining of interpreted methods that throw this often")    \
2978                                                                             \
2979   develop(intx, InlineThrowMaxSize,   200,                                  \
2980           "Force inlining of throwing methods smaller than this")           \
2981                                                                             \
2982   develop(intx, ProfilerNodeSize,  1024,                                    \
2983           "Size in K to allocate for the Profile Nodes of each thread")     \
2984                                                                             \
2985   product_pd(intx, PreInflateSpin,                                          \
2986           "Number of times to spin wait before inflation")                  \
2987                                                                             \
2988   /* gc parameters */                                                       \
2989   product(uintx, InitialHeapSize, 0,                                        \
2990           "Initial heap size (in bytes); zero means use ergonomics")        \
2991                                                                             \
2992   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
2993           "Maximum heap size (in bytes)")                                   \
2994                                                                             \
2995   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
2996           "Initial tenured generation size (in bytes)")                     \
2997                                                                             \
2998   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
2999           "Initial new generation size (in bytes)")                         \
3000                                                                             \
3001   product(uintx, MaxNewSize, max_uintx,                                     \
3002           "Maximum new generation size (in bytes), max_uintx means set "    \
3003           "ergonomically")                                                  \
3004                                                                             \
3005   product(uintx, PretenureSizeThreshold, 0,                                 \
3006           "Maximum size in bytes of objects allocated in DefNew "           \
3007           "generation; zero means no maximum")                              \
3008                                                                             \
3009   product(uintx, TLABSize, 0,                                               \
3010           "Starting TLAB size (in bytes); zero means set ergonomically")    \
3011                                                                             \
3012   product(uintx, MinTLABSize, 2*K,                                          \
3013           "Minimum allowed TLAB size (in bytes)")                           \
3014                                                                             \
3015   product(uintx, TLABAllocationWeight, 35,                                  \
3016           "Allocation averaging weight")                                    \
3017                                                                             \
3018   product(uintx, TLABWasteTargetPercent, 1,                                 \
3019           "Percentage of Eden that can be wasted")                          \
3020                                                                             \
3021   product(uintx, TLABRefillWasteFraction,    64,                            \
3022           "Max TLAB waste at a refill (internal fragmentation)")            \
3023                                                                             \
3024   product(uintx, TLABWasteIncrement,    4,                                  \
3025           "Increment allowed waste at slow allocation")                     \
3026                                                                             \
3027   product(uintx, SurvivorRatio, 8,                                          \
3028           "Ratio of eden/survivor space size")                              \
3029                                                                             \
3030   product(uintx, NewRatio, 2,                                               \
3031           "Ratio of new/old generation sizes")                              \
3032                                                                             \
3033   product_pd(uintx, NewSizeThreadIncrease,                                  \
3034           "Additional size added to desired new generation size per "       \
3035           "non-daemon thread (in bytes)")                                   \
3036                                                                             \
3037   product_pd(uintx, MetaspaceSize,                                          \
3038           "Initial size of Metaspaces (in bytes)")                          \
3039                                                                             \
3040   product(uintx, MaxMetaspaceSize, max_uintx,                               \
3041           "Maximum size of Metaspaces (in bytes)")                          \
3042                                                                             \
3043   product(uintx, ClassMetaspaceSize, 1*G,                                   \
3044           "Maximum size of InstanceKlass area in Metaspace used for "       \
3045           "UseCompressedKlassPointers")                                     \
3046                                                                             \
3047   product(uintx, MinHeapFreeRatio,    40,                                   \
3048           "Min percentage of heap free after GC to avoid expansion")        \
3049                                                                             \
3050   product(uintx, MaxHeapFreeRatio,    70,                                   \
3051           "Max percentage of heap free after GC to avoid shrinking")        \
3052                                                                             \
3053   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3054           "Number of milliseconds per MB of free space in the heap")        \
3055                                                                             \
3056   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3057           "Min change in heap space due to GC (in bytes)")                  \
3058                                                                             \
3059   product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K),            \
3060           "Min expansion of Metaspace (in bytes)")                          \
3061                                                                             \
3062   product(uintx, MinMetaspaceFreeRatio,    40,                              \
3063           "Min percentage of Metaspace free after GC to avoid expansion")   \
3064                                                                             \
3065   product(uintx, MaxMetaspaceFreeRatio,    70,                              \
3066           "Max percentage of Metaspace free after GC to avoid shrinking")   \
3067                                                                             \
3068   product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M),              \
3069           "Max expansion of Metaspace without full GC (in bytes)")          \
3070                                                                             \
3071   product(uintx, QueuedAllocationWarningCount, 0,                           \
3072           "Number of times an allocation that queues behind a GC "          \
3073           "will retry before printing a warning")                           \
3074                                                                             \
3075   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3076           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3077                                                                             \
3078   diagnostic(intx, VerifyGCLevel,     0,                                    \
3079           "Generation level at which to start +VerifyBefore/AfterGC")       \
3080                                                                             \
3081   product(uintx, MaxTenuringThreshold,    15,                               \
3082           "Maximum value for tenuring threshold")                           \
3083                                                                             \
3084   product(uintx, InitialTenuringThreshold,    7,                            \
3085           "Initial value for tenuring threshold")                           \
3086                                                                             \
3087   product(uintx, TargetSurvivorRatio,    50,                                \
3088           "Desired percentage of survivor space used after scavenge")       \
3089                                                                             \
3090   product(uintx, MarkSweepDeadRatio,     5,                                 \
3091           "Percentage (0-100) of the old gen allowed as dead wood."         \
3092           "Serial mark sweep treats this as both the min and max value."    \
3093           "CMS uses this value only if it falls back to mark sweep."        \
3094           "Par compact uses a variable scale based on the density of the"   \
3095           "generation and treats this as the max value when the heap is"    \
3096           "either completely full or completely empty.  Par compact also"   \
3097           "has a smaller default value; see arguments.cpp.")                \
3098                                                                             \
3099   product(uintx, MarkSweepAlwaysCompactCount,     4,                        \
3100           "How often should we fully compact the heap (ignoring the dead "  \
3101           "space parameters)")                                              \
3102                                                                             \
3103   product(intx, PrintCMSStatistics, 0,                                      \
3104           "Statistics for CMS")                                             \
3105                                                                             \
3106   product(bool, PrintCMSInitiationStatistics, false,                        \
3107           "Statistics for initiating a CMS collection")                     \
3108                                                                             \
3109   product(intx, PrintFLSStatistics, 0,                                      \
3110           "Statistics for CMS' FreeListSpace")                              \
3111                                                                             \
3112   product(intx, PrintFLSCensus, 0,                                          \
3113           "Census for CMS' FreeListSpace")                                  \
3114                                                                             \
3115   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3116           "Delay in ms between expansion and allocation")                   \
3117                                                                             \
3118   develop(uintx, GCWorkerDelayMillis, 0,                                    \
3119           "Delay in ms in scheduling GC workers")                           \
3120                                                                             \
3121   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3122           "(Unstable) Number of times to iterate in safepoint loop "        \
3123           " before blocking VM threads ")                                   \
3124                                                                             \
3125   product(intx, DeferPollingPageLoopCount,     -1,                          \
3126           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3127           "before changing safepoint polling page to RO ")                  \
3128                                                                             \
3129   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3130                                                                             \
3131   product(bool, PSChunkLargeArrays, true,                                   \
3132           "true: process large arrays in chunks")                           \
3133                                                                             \
3134   product(uintx, GCDrainStackTargetSize, 64,                                \
3135           "how many entries we'll try to leave on the stack during "        \
3136           "parallel GC")                                                    \
3137                                                                             \
3138   /* stack parameters */                                                    \
3139   product_pd(intx, StackYellowPages,                                        \
3140           "Number of yellow zone (recoverable overflows) pages")            \
3141                                                                             \
3142   product_pd(intx, StackRedPages,                                           \
3143           "Number of red zone (unrecoverable overflows) pages")             \
3144                                                                             \
3145   product_pd(intx, StackShadowPages,                                        \
3146           "Number of shadow zone (for overflow checking) pages"             \
3147           " this should exceed the depth of the VM and native call stack")  \
3148                                                                             \
3149   product_pd(intx, ThreadStackSize,                                         \
3150           "Thread Stack Size (in Kbytes)")                                  \
3151                                                                             \
3152   product_pd(intx, VMThreadStackSize,                                       \
3153           "Non-Java Thread Stack Size (in Kbytes)")                         \
3154                                                                             \
3155   product_pd(intx, CompilerThreadStackSize,                                 \
3156           "Compiler Thread Stack Size (in Kbytes)")                         \
3157                                                                             \
3158   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3159           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3160                                                                             \
3161   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3162           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3163           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3164           "disable this feature")                                           \
3165                                                                             \
3166   /* code cache parameters */                                               \
3167   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3168           "Code cache segment size (in bytes) - smallest unit of "          \
3169           "allocation")                                                     \
3170                                                                             \
3171   develop_pd(intx, CodeEntryAlignment,                                      \
3172           "Code entry alignment for generated code (in bytes)")             \
3173                                                                             \
3174   product_pd(intx, OptoLoopAlignment,                                       \
3175           "Align inner loops to zero relative to this modulus")             \
3176                                                                             \
3177   product_pd(uintx, InitialCodeCacheSize,                                   \
3178           "Initial code cache size (in bytes)")                             \
3179                                                                             \
3180   develop_pd(uintx, CodeCacheMinimumUseSpace,                               \
3181           "Minimum code cache size (in bytes) required to start VM.")       \
3182                                                                             \
3183   product_pd(uintx, ReservedCodeCacheSize,                                  \
3184           "Reserved code cache size (in bytes) - maximum code cache size")  \
3185                                                                             \
3186   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3187           "When less than X space left, we stop compiling.")                \
3188                                                                             \
3189   product_pd(uintx, CodeCacheExpansionSize,                                 \
3190           "Code cache expansion size (in bytes)")                           \
3191                                                                             \
3192   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3193           "Minimum number of segments in a code cache block.")              \
3194                                                                             \
3195   notproduct(bool, ExitOnFullCodeCache, false,                              \
3196           "Exit the VM if we fill the code cache.")                         \
3197                                                                             \
3198   product(bool, UseCodeCacheFlushing, true,                                 \
3199           "Attempt to clean the code cache before shutting off compiler")   \
3200                                                                             \
3201   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3202           "Min number of seconds between code cache cleaning sessions")     \
3203                                                                             \
3204   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3205           "When less than X space left, start code cache cleaning")         \
3206                                                                             \
3207   product(uintx, CodeCacheFlushingFraction, 2,                              \
3208           "Fraction of the code cache that is flushed when full")           \
3209                                                                             \
3210   /* interpreter debugging */                                               \
3211   develop(intx, BinarySwitchThreshold, 5,                                   \
3212           "Minimal number of lookupswitch entries for rewriting to binary " \
3213           "switch")                                                         \
3214                                                                             \
3215   develop(intx, StopInterpreterAt, 0,                                       \
3216           "Stops interpreter execution at specified bytecode number")       \
3217                                                                             \
3218   develop(intx, TraceBytecodesAt, 0,                                        \
3219           "Traces bytecodes starting with specified bytecode number")       \
3220                                                                             \
3221   /* compiler interface */                                                  \
3222   develop(intx, CIStart, 0,                                                 \
3223           "the id of the first compilation to permit")                      \
3224                                                                             \
3225   develop(intx, CIStop,    -1,                                              \
3226           "the id of the last compilation to permit")                       \
3227                                                                             \
3228   develop(intx, CIStartOSR,     0,                                          \
3229           "the id of the first osr compilation to permit "                  \
3230           "(CICountOSR must be on)")                                        \
3231                                                                             \
3232   develop(intx, CIStopOSR,    -1,                                           \
3233           "the id of the last osr compilation to permit "                   \
3234           "(CICountOSR must be on)")                                        \
3235                                                                             \
3236   develop(intx, CIBreakAtOSR,    -1,                                        \
3237           "id of osr compilation to break at")                              \
3238                                                                             \
3239   develop(intx, CIBreakAt,    -1,                                           \
3240           "id of compilation to break at")                                  \
3241                                                                             \
3242   product(ccstrlist, CompileOnly, "",                                       \
3243           "List of methods (pkg/class.name) to restrict compilation to")    \
3244                                                                             \
3245   product(ccstr, CompileCommandFile, NULL,                                  \
3246           "Read compiler commands from this file [.hotspot_compiler]")      \
3247                                                                             \
3248   product(ccstrlist, CompileCommand, "",                                    \
3249           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3250                                                                             \
3251   develop(bool, ReplayCompiles, false,                                      \
3252           "Enable replay of compilations from ReplayDataFile")              \
3253                                                                             \
3254   product(ccstr, ReplayDataFile, NULL,                                      \
3255           "File containing compilation replay information"                  \
3256           "[default: ./replay_pid%p.log] (%p replaced with pid)")           \
3257                                                                             \
3258   develop(intx, ReplaySuppressInitializers, 2,                              \
3259           "Controls handling of class initialization during replay"         \
3260           "0 - don't do anything special"                                   \
3261           "1 - treat all class initializers as empty"                       \
3262           "2 - treat class initializers for application classes as empty"   \
3263           "3 - allow all class initializers to run during bootstrap but"    \
3264           "    pretend they are empty after starting replay")               \
3265                                                                             \
3266   develop(bool, ReplayIgnoreInitErrors, false,                              \
3267           "Ignore exceptions thrown during initialization for replay")      \
3268                                                                             \
3269   product(bool, DumpReplayDataOnError, true,                                \
3270           "Record replay data for crashing compiler threads")               \
3271                                                                             \
3272   product(bool, CICompilerCountPerCPU, false,                               \
3273           "1 compiler thread for log(N CPUs)")                              \
3274                                                                             \
3275   develop(intx, CIFireOOMAt,    -1,                                         \
3276           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3277           "(non-negative value throws OOM after this many CI accesses "     \
3278           "in each compile)")                                               \
3279   notproduct(intx, CICrashAt, -1,                                           \
3280           "id of compilation to trigger assert in compiler thread for "     \
3281           "the purpose of testing, e.g. generation of replay data")         \
3282   notproduct(bool, CIObjectFactoryVerify, false,                            \
3283           "enable potentially expensive verification in ciObjectFactory")   \
3284                                                                             \
3285   /* Priorities */                                                          \
3286   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3287                                                                             \
3288   product(intx, ThreadPriorityPolicy, 0,                                    \
3289           "0 : Normal.                                                     "\
3290           "    VM chooses priorities that are appropriate for normal       "\
3291           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3292           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3293           "    map to lower native priority values. On Windows applications"\
3294           "    are allowed to use higher native priorities. However, with  "\
3295           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3296           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3297           "    interfere with system threads. On Linux thread priorities   "\
3298           "    are ignored because the OS does not support static priority "\
3299           "    in SCHED_OTHER scheduling class which is the only choice for"\
3300           "    non-root, non-realtime applications.                        "\
3301           "1 : Aggressive.                                                 "\
3302           "    Java thread priorities map over to the entire range of      "\
3303           "    native thread priorities. Higher Java thread priorities map "\
3304           "    to higher native thread priorities. This policy should be   "\
3305           "    used with care, as sometimes it can cause performance       "\
3306           "    degradation in the application and/or the entire system. On "\
3307           "    Linux this policy requires root privilege.")                 \
3308                                                                             \
3309   product(bool, ThreadPriorityVerbose, false,                               \
3310           "Print priority changes")                                         \
3311                                                                             \
3312   product(intx, DefaultThreadPriority, -1,                                  \
3313           "The native priority at which threads run if not elsewhere "      \
3314           "specified (-1 means no change)")                                 \
3315                                                                             \
3316   product(intx, CompilerThreadPriority, -1,                                 \
3317           "The native priority at which compiler threads should run "       \
3318           "(-1 means no change)")                                           \
3319                                                                             \
3320   product(intx, VMThreadPriority, -1,                                       \
3321           "The native priority at which the VM thread should run "          \
3322           "(-1 means no change)")                                           \
3323                                                                             \
3324   product(bool, CompilerThreadHintNoPreempt, true,                          \
3325           "(Solaris only) Give compiler threads an extra quanta")           \
3326                                                                             \
3327   product(bool, VMThreadHintNoPreempt, false,                               \
3328           "(Solaris only) Give VM thread an extra quanta")                  \
3329                                                                             \
3330   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3331   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3332   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3333   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3334   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3335   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3336   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3337   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3338   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3339   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3340                                                                             \
3341   experimental(bool, UseCriticalJavaThreadPriority, false,                  \
3342           "Java thread priority 10 maps to critical scheduling priority")   \
3343                                                                             \
3344   experimental(bool, UseCriticalCompilerThreadPriority, false,              \
3345           "Compiler thread(s) run at critical scheduling priority")         \
3346                                                                             \
3347   experimental(bool, UseCriticalCMSThreadPriority, false,                   \
3348           "ConcurrentMarkSweep thread runs at critical scheduling priority")\
3349                                                                             \
3350   /* compiler debugging */                                                  \
3351   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3352           "First class to consider when using +CompileTheWorld")            \
3353                                                                             \
3354   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3355           "Last class to consider when using +CompileTheWorld")             \
3356                                                                             \
3357   develop(intx, NewCodeParameter,      0,                                   \
3358           "Testing Only: Create a dedicated integer parameter before "      \
3359           "putback")                                                        \
3360                                                                             \
3361   /* new oopmap storage allocation */                                       \
3362   develop(intx, MinOopMapAllocation,     8,                                 \
3363           "Minimum number of OopMap entries in an OopMapSet")               \
3364                                                                             \
3365   /* Background Compilation */                                              \
3366   develop(intx, LongCompileThreshold,     50,                               \
3367           "Used with +TraceLongCompiles")                                   \
3368                                                                             \
3369   product(intx, StarvationMonitorInterval,    200,                          \
3370           "Pause between each check in ms")                                 \
3371                                                                             \
3372   /* recompilation */                                                       \
3373   product_pd(intx, CompileThreshold,                                        \
3374           "number of interpreted method invocations before (re-)compiling") \
3375                                                                             \
3376   product_pd(intx, BackEdgeThreshold,                                       \
3377           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3378                                                                             \
3379   product(intx, Tier0InvokeNotifyFreqLog, 7,                                \
3380           "Interpreter (tier 0) invocation notification frequency.")        \
3381                                                                             \
3382   product(intx, Tier2InvokeNotifyFreqLog, 11,                               \
3383           "C1 without MDO (tier 2) invocation notification frequency.")     \
3384                                                                             \
3385   product(intx, Tier3InvokeNotifyFreqLog, 10,                               \
3386           "C1 with MDO profiling (tier 3) invocation notification "         \
3387           "frequency.")                                                     \
3388                                                                             \
3389   product(intx, Tier23InlineeNotifyFreqLog, 20,                             \
3390           "Inlinee invocation (tiers 2 and 3) notification frequency")      \
3391                                                                             \
3392   product(intx, Tier0BackedgeNotifyFreqLog, 10,                             \
3393           "Interpreter (tier 0) invocation notification frequency.")        \
3394                                                                             \
3395   product(intx, Tier2BackedgeNotifyFreqLog, 14,                             \
3396           "C1 without MDO (tier 2) invocation notification frequency.")     \
3397                                                                             \
3398   product(intx, Tier3BackedgeNotifyFreqLog, 13,                             \
3399           "C1 with MDO profiling (tier 3) invocation notification "         \
3400           "frequency.")                                                     \
3401                                                                             \
3402   product(intx, Tier2CompileThreshold, 0,                                   \
3403           "threshold at which tier 2 compilation is invoked")               \
3404                                                                             \
3405   product(intx, Tier2BackEdgeThreshold, 0,                                  \
3406           "Back edge threshold at which tier 2 compilation is invoked")     \
3407                                                                             \
3408   product(intx, Tier3InvocationThreshold, 200,                              \
3409           "Compile if number of method invocations crosses this "           \
3410           "threshold")                                                      \
3411                                                                             \
3412   product(intx, Tier3MinInvocationThreshold, 100,                           \
3413           "Minimum invocation to compile at tier 3")                        \
3414                                                                             \
3415   product(intx, Tier3CompileThreshold, 2000,                                \
3416           "Threshold at which tier 3 compilation is invoked (invocation "   \
3417           "minimum must be satisfied.")                                     \
3418                                                                             \
3419   product(intx, Tier3BackEdgeThreshold,  60000,                             \
3420           "Back edge threshold at which tier 3 OSR compilation is invoked") \
3421                                                                             \
3422   product(intx, Tier4InvocationThreshold, 5000,                             \
3423           "Compile if number of method invocations crosses this "           \
3424           "threshold")                                                      \
3425                                                                             \
3426   product(intx, Tier4MinInvocationThreshold, 600,                           \
3427           "Minimum invocation to compile at tier 4")                        \
3428                                                                             \
3429   product(intx, Tier4CompileThreshold, 15000,                               \
3430           "Threshold at which tier 4 compilation is invoked (invocation "   \
3431           "minimum must be satisfied.")                                     \
3432                                                                             \
3433   product(intx, Tier4BackEdgeThreshold, 40000,                              \
3434           "Back edge threshold at which tier 4 OSR compilation is invoked") \
3435                                                                             \
3436   product(intx, Tier3DelayOn, 5,                                            \
3437           "If C2 queue size grows over this amount per compiler thread "    \
3438           "stop compiling at tier 3 and start compiling at tier 2")         \
3439                                                                             \
3440   product(intx, Tier3DelayOff, 2,                                           \
3441           "If C2 queue size is less than this amount per compiler thread "  \
3442           "allow methods compiled at tier 2 transition to tier 3")          \
3443                                                                             \
3444   product(intx, Tier3LoadFeedback, 5,                                       \
3445           "Tier 3 thresholds will increase twofold when C1 queue size "     \
3446           "reaches this amount per compiler thread")                        \
3447                                                                             \
3448   product(intx, Tier4LoadFeedback, 3,                                       \
3449           "Tier 4 thresholds will increase twofold when C2 queue size "     \
3450           "reaches this amount per compiler thread")                        \
3451                                                                             \
3452   product(intx, TieredCompileTaskTimeout, 50,                               \
3453           "Kill compile task if method was not used within "                \
3454           "given timeout in milliseconds")                                  \
3455                                                                             \
3456   product(intx, TieredStopAtLevel, 4,                                       \
3457           "Stop at given compilation level")                                \
3458                                                                             \
3459   product(intx, Tier0ProfilingStartPercentage, 200,                         \
3460           "Start profiling in interpreter if the counters exceed tier 3"    \
3461           "thresholds by the specified percentage")                         \
3462                                                                             \
3463   product(uintx, IncreaseFirstTierCompileThresholdAt, 50,                   \
3464           "Increase the compile threshold for C1 compilation if the code"   \
3465           "cache is filled by the specified percentage.")                   \
3466                                                                             \
3467   product(intx, TieredRateUpdateMinTime, 1,                                 \
3468           "Minimum rate sampling interval (in milliseconds)")               \
3469                                                                             \
3470   product(intx, TieredRateUpdateMaxTime, 25,                                \
3471           "Maximum rate sampling interval (in milliseconds)")               \
3472                                                                             \
3473   product_pd(bool, TieredCompilation,                                       \
3474           "Enable tiered compilation")                                      \
3475                                                                             \
3476   product(bool, PrintTieredEvents, false,                                   \
3477           "Print tiered events notifications")                              \
3478                                                                             \
3479   product_pd(intx, OnStackReplacePercentage,                                \
3480           "NON_TIERED number of method invocations/branches (expressed as %"\
3481           "of CompileThreshold) before (re-)compiling OSR code")            \
3482                                                                             \
3483   product(intx, InterpreterProfilePercentage, 33,                           \
3484           "NON_TIERED number of method invocations/branches (expressed as %"\
3485           "of CompileThreshold) before profiling in the interpreter")       \
3486                                                                             \
3487   develop(intx, MaxRecompilationSearchLength,    10,                        \
3488           "max. # frames to inspect searching for recompilee")              \
3489                                                                             \
3490   develop(intx, MaxInterpretedSearchLength,     3,                          \
3491           "max. # interp. frames to skip when searching for recompilee")    \
3492                                                                             \
3493   develop(intx, DesiredMethodLimit,  8000,                                  \
3494           "desired max. method size (in bytecodes) after inlining")         \
3495                                                                             \
3496   develop(intx, HugeMethodLimit,  8000,                                     \
3497           "don't compile methods larger than this if "                      \
3498           "+DontCompileHugeMethods")                                        \
3499                                                                             \
3500   /* New JDK 1.4 reflection implementation */                               \
3501                                                                             \
3502   develop(bool, UseNewReflection, true,                                     \
3503           "Temporary flag for transition to reflection based on dynamic "   \
3504           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3505           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3506           "changes were needed")                                            \
3507                                                                             \
3508   develop(bool, VerifyReflectionBytecodes, false,                           \
3509           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3510           "in situations like that described in 4486457 or for "            \
3511           "constructors generated for serialization, so can not be enabled "\
3512           "in product.")                                                    \
3513                                                                             \
3514   product(bool, ReflectionWrapResolutionErrors, true,                       \
3515           "Temporary flag for transition to AbstractMethodError wrapped "   \
3516           "in InvocationTargetException. See 6531596")                      \
3517                                                                             \
3518   develop(bool, VerifyLambdaBytecodes, false,                               \
3519           "Force verification of jdk 8 lambda metafactory bytecodes.")      \
3520                                                                             \
3521   develop(intx, FastSuperclassLimit, 8,                                     \
3522           "Depth of hardwired instanceof accelerator array")                \
3523                                                                             \
3524   /* Properties for Java libraries  */                                      \
3525                                                                             \
3526   product(uintx, MaxDirectMemorySize, 0,                                    \
3527           "Maximum total size of NIO direct-buffer allocations")            \
3528                                                                             \
3529   /* temporary developer defined flags  */                                  \
3530                                                                             \
3531   diagnostic(bool, UseNewCode, false,                                       \
3532           "Testing Only: Use the new version while testing")                \
3533                                                                             \
3534   diagnostic(bool, UseNewCode2, false,                                      \
3535           "Testing Only: Use the new version while testing")                \
3536                                                                             \
3537   diagnostic(bool, UseNewCode3, false,                                      \
3538           "Testing Only: Use the new version while testing")                \
3539                                                                             \
3540   /* flags for performance data collection */                               \
3541                                                                             \
3542   product(bool, UsePerfData, falseInEmbedded,                               \
3543           "Flag to disable jvmstat instrumentation for performance testing" \
3544           "and problem isolation purposes.")                                \
3545                                                                             \
3546   product(bool, PerfDataSaveToFile, false,                                  \
3547           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3548                                                                             \
3549   product(ccstr, PerfDataSaveFile, NULL,                                    \
3550           "Save PerfData memory to the specified absolute pathname,"        \
3551            "%p in the file name if present will be replaced by pid")        \
3552                                                                             \
3553   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3554           "Data sampling interval in milliseconds")                         \
3555                                                                             \
3556   develop(bool, PerfTraceDataCreation, false,                               \
3557           "Trace creation of Performance Data Entries")                     \
3558                                                                             \
3559   develop(bool, PerfTraceMemOps, false,                                     \
3560           "Trace PerfMemory create/attach/detach calls")                    \
3561                                                                             \
3562   product(bool, PerfDisableSharedMem, false,                                \
3563           "Store performance data in standard memory")                      \
3564                                                                             \
3565   product(intx, PerfDataMemorySize, 32*K,                                   \
3566           "Size of performance data memory region. Will be rounded "        \
3567           "up to a multiple of the native os page size.")                   \
3568                                                                             \
3569   product(intx, PerfMaxStringConstLength, 1024,                             \
3570           "Maximum PerfStringConstant string length before truncation")     \
3571                                                                             \
3572   product(bool, PerfAllowAtExitRegistration, false,                         \
3573           "Allow registration of atexit() methods")                         \
3574                                                                             \
3575   product(bool, PerfBypassFileSystemCheck, false,                           \
3576           "Bypass Win32 file system criteria checks (Windows Only)")        \
3577                                                                             \
3578   product(intx, UnguardOnExecutionViolation, 0,                             \
3579           "Unguard page and retry on no-execute fault (Win32 only)"         \
3580           "0=off, 1=conservative, 2=aggressive")                            \
3581                                                                             \
3582   /* Serviceability Support */                                              \
3583                                                                             \
3584   product(bool, ManagementServer, false,                                    \
3585           "Create JMX Management Server")                                   \
3586                                                                             \
3587   product(bool, DisableAttachMechanism, false,                              \
3588          "Disable mechanism that allows tools to attach to this VM")        \
3589                                                                             \
3590   product(bool, StartAttachListener, false,                                 \
3591           "Always start Attach Listener at VM startup")                     \
3592                                                                             \
3593   manageable(bool, PrintConcurrentLocks, false,                             \
3594           "Print java.util.concurrent locks in thread dump")                \
3595                                                                             \
3596   product(bool, TransmitErrorReport, false,                                 \
3597           "Enable error report transmission on erroneous termination")      \
3598                                                                             \
3599   product(ccstr, ErrorReportServer, NULL,                                   \
3600           "Override built-in error report server address")                  \
3601                                                                             \
3602   /* Shared spaces */                                                       \
3603                                                                             \
3604   product(bool, UseSharedSpaces, true,                                      \
3605           "Use shared spaces for metadata")                                 \
3606                                                                             \
3607   product(bool, RequireSharedSpaces, false,                                 \
3608           "Require shared spaces for metadata")                             \
3609                                                                             \
3610   product(bool, DumpSharedSpaces, false,                                    \
3611            "Special mode: JVM reads a class list, loads classes, builds "   \
3612             "shared spaces, and dumps the shared spaces to a file to be "   \
3613             "used in future JVM runs.")                                     \
3614                                                                             \
3615   product(bool, PrintSharedSpaces, false,                                   \
3616           "Print usage of shared spaces")                                   \
3617                                                                             \
3618   product(uintx, SharedReadWriteSize,  NOT_LP64(12*M) LP64_ONLY(16*M),      \
3619           "Size of read-write space for metadata (in bytes)")               \
3620                                                                             \
3621   product(uintx, SharedReadOnlySize,  NOT_LP64(12*M) LP64_ONLY(16*M),       \
3622           "Size of read-only space for metadata (in bytes)")                \
3623                                                                             \
3624   product(uintx, SharedMiscDataSize,    NOT_LP64(2*M) LP64_ONLY(4*M),       \
3625           "Size of the shared miscellaneous data area (in bytes)")          \
3626                                                                             \
3627   product(uintx, SharedMiscCodeSize,    120*K,                              \
3628           "Size of the shared miscellaneous code area (in bytes)")          \
3629                                                                             \
3630   product(uintx, SharedBaseAddress, LP64_ONLY(32*G)                         \
3631           NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)),                           \
3632           "Address to allocate shared memory region for class data")        \
3633                                                                             \
3634   diagnostic(bool, EnableInvokeDynamic, true,                               \
3635           "support JSR 292 (method handles, invokedynamic, "                \
3636           "anonymous classes")                                              \
3637                                                                             \
3638   diagnostic(bool, PrintMethodHandleStubs, false,                           \
3639           "Print generated stub code for method handles")                   \
3640                                                                             \
3641   develop(bool, TraceMethodHandles, false,                                  \
3642           "trace internal method handle operations")                        \
3643                                                                             \
3644   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3645           "perform extra checks when constructing method handles")          \
3646                                                                             \
3647   diagnostic(bool, ShowHiddenFrames, false,                                 \
3648           "show method handle implementation frames (usually hidden)")      \
3649                                                                             \
3650   experimental(bool, TrustFinalNonStaticFields, false,                      \
3651           "trust final non-static declarations for constant folding")       \
3652                                                                             \
3653   experimental(bool, FoldStableValues, false,                               \
3654           "Private flag to control optimizations for stable variables")     \
3655                                                                             \
3656   develop(bool, TraceInvokeDynamic, false,                                  \
3657           "trace internal invoke dynamic operations")                       \
3658                                                                             \
3659   diagnostic(bool, PauseAtStartup,      false,                              \
3660           "Causes the VM to pause at startup time and wait for the pause "  \
3661           "file to be removed (default: ./vm.paused.<pid>)")                \
3662                                                                             \
3663   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3664           "The file to create and for whose removal to await when pausing " \
3665           "at startup. (default: ./vm.paused.<pid>)")                       \
3666                                                                             \
3667   diagnostic(bool, PauseAtExit, false,                                      \
3668           "Pause and wait for keypress on exit if a debugger is attached")  \
3669                                                                             \
3670   product(bool, ExtendedDTraceProbes,    false,                             \
3671           "Enable performance-impacting dtrace probes")                     \
3672                                                                             \
3673   product(bool, DTraceMethodProbes, false,                                  \
3674           "Enable dtrace probes for method-entry and method-exit")          \
3675                                                                             \
3676   product(bool, DTraceAllocProbes, false,                                   \
3677           "Enable dtrace probes for object allocation")                     \
3678                                                                             \
3679   product(bool, DTraceMonitorProbes, false,                                 \
3680           "Enable dtrace probes for monitor events")                        \
3681                                                                             \
3682   product(bool, RelaxAccessControlCheck, false,                             \
3683           "Relax the access control checks in the verifier")                \
3684                                                                             \
3685   diagnostic(bool, PrintDTraceDOF, false,                                   \
3686              "Print the DTrace DOF passed to the system for JSDT probes")   \
3687                                                                             \
3688   product(uintx, StringTableSize, defaultStringTableSize,                   \
3689           "Number of buckets in the interned String table")                 \
3690                                                                             \
3691   develop(bool, TraceDefaultMethods, false,                                 \
3692           "Trace the default method processing steps")                      \
3693                                                                             \
3694   develop(bool, VerifyGenericSignatures, false,                             \
3695           "Abort VM on erroneous or inconsistent generic signatures")       \
3696                                                                             \
3697   product(bool, UseVMInterruptibleIO, false,                                \
3698           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3699           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3700           " of this flag is true for JDK 6 and earlier")                    \
3701                                                                             \
3702   diagnostic(bool, WhiteBoxAPI, false,                                      \
3703           "Enable internal testing APIs")                                   \
3704                                                                             \
3705   product(bool, PrintGCCause, true,                                         \
3706           "Include GC cause in GC logging")                                 \
3707                                                                             \
3708   product(bool , AllowNonVirtualCalls, false,                               \
3709           "Obey the ACC_SUPER flag and allow invokenonvirtual calls")       \
3710                                                                             \
3711   diagnostic(ccstr, SharedArchiveFile, NULL,                                \
3712           "Override the default location of the CDS archive file")          \
3713                                                                             \
3714   experimental(uintx, ArrayAllocatorMallocLimit,                            \
3715           SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx),                        \
3716           "Allocation less than this value will be allocated "              \
3717           "using malloc. Larger allocations will use mmap.")                \
3718                                                                             \
3719   product(bool, EnableTracing, false,                                       \
3720           "Enable event-based tracing")                                     \
3721   product(bool, UseLockedTracing, false,                                    \
3722           "Use locked-tracing when doing event-based tracing")
3723 
3724 
3725 /*
3726  *  Macros for factoring of globals
3727  */
3728 
3729 // Interface macros
3730 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3731 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3732 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3733 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3734 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3735 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3736 #ifdef PRODUCT
3737 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3738 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3739 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3740 #else
3741 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3742 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3743 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3744 #endif
3745 // Special LP64 flags, product only needed for now.
3746 #ifdef _LP64
3747 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3748 #else
3749 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3750 #endif // _LP64
3751 
3752 // Implementation macros
3753 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3754 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3755 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3756 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3757 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3758 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3759 #ifdef PRODUCT
3760 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3761 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3762 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3763 #else
3764 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3765 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3766 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3767 #endif
3768 #ifdef _LP64
3769 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3770 #else
3771 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3772 #endif // _LP64
3773 
3774 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)
3775 
3776 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)
3777 
3778 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG)
3779 
3780 // Extensions
3781 
3782 #include "runtime/globals_ext.hpp"
3783 
3784 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP