1 /*
   2  * Copyright (c) 1997, 2010, 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 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK)
  26 define_pd_global(bool, BackgroundCompilation,        false);
  27 define_pd_global(bool, UseTLAB,                      false);
  28 define_pd_global(bool, CICompileOSR,                 false);
  29 define_pd_global(bool, UseTypeProfile,               false);
  30 define_pd_global(bool, UseOnStackReplacement,        false);
  31 define_pd_global(bool, InlineIntrinsics,             false);
  32 define_pd_global(bool, PreferInterpreterNativeStubs, true);
  33 define_pd_global(bool, ProfileInterpreter,           false);
  34 define_pd_global(bool, ProfileTraps,                 false);
  35 define_pd_global(bool, TieredCompilation,            false);
  36 
  37 define_pd_global(intx, CompileThreshold,             0);
  38 define_pd_global(intx, Tier2CompileThreshold,        0);
  39 define_pd_global(intx, Tier3CompileThreshold,        0);
  40 define_pd_global(intx, Tier4CompileThreshold,        0);
  41 
  42 define_pd_global(intx, BackEdgeThreshold,            0);
  43 define_pd_global(intx, Tier2BackEdgeThreshold,       0);
  44 define_pd_global(intx, Tier3BackEdgeThreshold,       0);
  45 define_pd_global(intx, Tier4BackEdgeThreshold,       0);
  46 
  47 define_pd_global(intx, OnStackReplacePercentage,     0);
  48 define_pd_global(bool, ResizeTLAB,                   false);
  49 define_pd_global(intx, FreqInlineSize,               0);
  50 define_pd_global(intx, InlineSmallCode,              0);
  51 define_pd_global(intx, NewSizeThreadIncrease,        4*K);
  52 define_pd_global(intx, InlineClassNatives,           true);
  53 define_pd_global(intx, InlineUnsafeOps,              true);
  54 define_pd_global(intx, InitialCodeCacheSize,         160*K);
  55 define_pd_global(intx, ReservedCodeCacheSize,        32*M);
  56 define_pd_global(intx, CodeCacheExpansionSize,       32*K);
  57 define_pd_global(intx, CodeCacheMinBlockLength,      1);
  58 define_pd_global(uintx,PermSize,    ScaleForWordSize(4*M));
  59 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M));
  60 define_pd_global(bool, NeverActAsServerClassMachine, true);
  61 define_pd_global(uint64_t,MaxRAM,                    1ULL*G);
  62 #define CI_COMPILER_COUNT 0
  63 #else
  64 
  65 #ifdef COMPILER2
  66 #define CI_COMPILER_COUNT 2
  67 #else
  68 #define CI_COMPILER_COUNT 1
  69 #endif // COMPILER2
  70 
  71 #endif // no compilers
  72 
  73 
  74 // string type aliases used only in this file
  75 typedef const char* ccstr;
  76 typedef const char* ccstrlist;   // represents string arguments which accumulate
  77 
  78 enum FlagValueOrigin {
  79   DEFAULT          = 0,
  80   COMMAND_LINE     = 1,
  81   ENVIRON_VAR      = 2,
  82   CONFIG_FILE      = 3,
  83   MANAGEMENT       = 4,
  84   ERGONOMIC        = 5,
  85   ATTACH_ON_DEMAND = 6,
  86   INTERNAL         = 99
  87 };
  88 
  89 struct Flag {
  90   const char *type;
  91   const char *name;
  92   void*       addr;
  93 
  94   NOT_PRODUCT(const char *doc;)
  95 
  96   const char *kind;
  97   FlagValueOrigin origin;
  98 
  99   // points to all Flags static array
 100   static Flag *flags;
 101 
 102   // number of flags
 103   static size_t numFlags;
 104 
 105   static Flag* find_flag(char* name, size_t length);
 106 
 107   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 108   bool get_bool() const       { return *((bool*) addr); }
 109   void set_bool(bool value)   { *((bool*) addr) = value; }
 110 
 111   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 112   intx get_intx() const       { return *((intx*) addr); }
 113   void set_intx(intx value)   { *((intx*) addr) = value; }
 114 
 115   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 116   uintx get_uintx() const     { return *((uintx*) addr); }
 117   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 118 
 119   bool is_uint64_t() const          { return strcmp(type, "uint64_t") == 0; }
 120   uint64_t get_uint64_t() const     { return *((uint64_t*) addr); }
 121   void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; }
 122 
 123   bool is_double() const        { return strcmp(type, "double") == 0; }
 124   double get_double() const     { return *((double*) addr); }
 125   void set_double(double value) { *((double*) addr) = value; }
 126 
 127   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 128   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 129   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 130   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 131 
 132   bool is_unlocker() const;
 133   bool is_unlocked() const;
 134   bool is_writeable() const;
 135   bool is_external() const;
 136 
 137   void print_on(outputStream* st, bool withComments = false );
 138   void print_as_flag(outputStream* st);
 139 };
 140 
 141 // debug flags control various aspects of the VM and are global accessible
 142 
 143 // use FlagSetting to temporarily change some debug flag
 144 // e.g. FlagSetting fs(DebugThisAndThat, true);
 145 // restored to previous value upon leaving scope
 146 class FlagSetting {
 147   bool val;
 148   bool* flag;
 149  public:
 150   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 151   ~FlagSetting()                       { *flag = val; }
 152 };
 153 
 154 
 155 class CounterSetting {
 156   intx* counter;
 157  public:
 158   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 159   ~CounterSetting()         { (*counter)--; }
 160 };
 161 
 162 
 163 class IntFlagSetting {
 164   intx val;
 165   intx* flag;
 166  public:
 167   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 168   ~IntFlagSetting()                       { *flag = val; }
 169 };
 170 
 171 
 172 class DoubleFlagSetting {
 173   double val;
 174   double* flag;
 175  public:
 176   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 177   ~DoubleFlagSetting()                           { *flag = val; }
 178 };
 179 
 180 
 181 class CommandLineFlags {
 182  public:
 183   static bool boolAt(char* name, size_t len, bool* value);
 184   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 185   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 186   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 187 
 188   static bool intxAt(char* name, size_t len, intx* value);
 189   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 190   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 191   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 192 
 193   static bool uintxAt(char* name, size_t len, uintx* value);
 194   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 195   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 196   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 197 
 198   static bool uint64_tAt(char* name, size_t len, uint64_t* value);
 199   static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); }
 200   static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin);
 201   static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); }
 202 
 203   static bool doubleAt(char* name, size_t len, double* value);
 204   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 205   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 206   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 207 
 208   static bool ccstrAt(char* name, size_t len, ccstr* value);
 209   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 210   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 211   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 212 
 213   // Returns false if name is not a command line flag.
 214   static bool wasSetOnCmdline(const char* name, bool* value);
 215   static void printSetFlags();
 216 
 217   static void printFlags(bool withComments = false );
 218 
 219   static void verify() PRODUCT_RETURN;
 220 };
 221 
 222 // use this for flags that are true by default in the debug version but
 223 // false in the optimized version, and vice versa
 224 #ifdef ASSERT
 225 #define trueInDebug  true
 226 #define falseInDebug false
 227 #else
 228 #define trueInDebug  false
 229 #define falseInDebug true
 230 #endif
 231 
 232 // use this for flags that are true per default in the product build
 233 // but false in development builds, and vice versa
 234 #ifdef PRODUCT
 235 #define trueInProduct  true
 236 #define falseInProduct false
 237 #else
 238 #define trueInProduct  false
 239 #define falseInProduct true
 240 #endif
 241 
 242 // use this for flags that are true per default in the tiered build
 243 // but false in non-tiered builds, and vice versa
 244 #ifdef TIERED
 245 #define  trueInTiered true
 246 #define falseInTiered false
 247 #else
 248 #define  trueInTiered false
 249 #define falseInTiered true
 250 #endif
 251 
 252 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 253 // product flags are always settable / visible
 254 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 255 
 256 // A flag must be declared with one of the following types:
 257 // bool, intx, uintx, ccstr.
 258 // The type "ccstr" is an alias for "const char*" and is used
 259 // only in this file, because the macrology requires single-token type names.
 260 
 261 // Note: Diagnostic options not meant for VM tuning or for product modes.
 262 // They are to be used for VM quality assurance or field diagnosis
 263 // of VM bugs.  They are hidden so that users will not be encouraged to
 264 // try them as if they were VM ordinary execution options.  However, they
 265 // are available in the product version of the VM.  Under instruction
 266 // from support engineers, VM customers can turn them on to collect
 267 // diagnostic information about VM problems.  To use a VM diagnostic
 268 // option, you must first specify +UnlockDiagnosticVMOptions.
 269 // (This master switch also affects the behavior of -Xprintflags.)
 270 //
 271 // experimental flags are in support of features that are not
 272 //    part of the officially supported product, but are available
 273 //    for experimenting with. They could, for example, be performance
 274 //    features that may not have undergone full or rigorous QA, but which may
 275 //    help performance in some cases and released for experimentation
 276 //    by the community of users and developers. This flag also allows one to
 277 //    be able to build a fully supported product that nonetheless also
 278 //    ships with some unsupported, lightly tested, experimental features.
 279 //    Like the UnlockDiagnosticVMOptions flag above, there is a corresponding
 280 //    UnlockExperimentalVMOptions flag, which allows the control and
 281 //    modification of the experimental flags.
 282 //
 283 // manageable flags are writeable external product flags.
 284 //    They are dynamically writeable through the JDK management interface
 285 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 286 //    These flags are external exported interface (see CCC).  The list of
 287 //    manageable flags can be queried programmatically through the management
 288 //    interface.
 289 //
 290 //    A flag can be made as "manageable" only if
 291 //    - the flag is defined in a CCC as an external exported interface.
 292 //    - the VM implementation supports dynamic setting of the flag.
 293 //      This implies that the VM must *always* query the flag variable
 294 //      and not reuse state related to the flag state at any given time.
 295 //    - you want the flag to be queried programmatically by the customers.
 296 //
 297 // product_rw flags are writeable internal product flags.
 298 //    They are like "manageable" flags but for internal/private use.
 299 //    The list of product_rw flags are internal/private flags which
 300 //    may be changed/removed in a future release.  It can be set
 301 //    through the management interface to get/set value
 302 //    when the name of flag is supplied.
 303 //
 304 //    A flag can be made as "product_rw" only if
 305 //    - the VM implementation supports dynamic setting of the flag.
 306 //      This implies that the VM must *always* query the flag variable
 307 //      and not reuse state related to the flag state at any given time.
 308 //
 309 // Note that when there is a need to support develop flags to be writeable,
 310 // it can be done in the same way as product_rw.
 311 
 312 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \
 313                                                                             \
 314   lp64_product(bool, UseCompressedOops, false,                              \
 315             "Use 32-bit object references in 64-bit VM. "                   \
 316             "lp64_product means flag is always constant in 32 bit VM")      \
 317                                                                             \
 318   notproduct(bool, CheckCompressedOops, true,                               \
 319             "generate checks in encoding/decoding code in debug VM")        \
 320                                                                             \
 321   product_pd(uintx, HeapBaseMinAddress,                                     \
 322             "OS specific low limit for heap base address")                  \
 323                                                                             \
 324   diagnostic(bool, PrintCompressedOopsMode, false,                          \
 325             "Print compressed oops base address and encoding mode")         \
 326                                                                             \
 327   lp64_product(intx, ObjectAlignmentInBytes, 8,                             \
 328           "Default object alignment in bytes, 8 is minimum")                \
 329                                                                             \
 330   /* UseMembar is theoretically a temp flag used for memory barrier         \
 331    * removal testing.  It was supposed to be removed before FCS but has     \
 332    * been re-added (see 6401008) */                                         \
 333   product(bool, UseMembar, false,                                           \
 334           "(Unstable) Issues membars on thread state transitions")          \
 335                                                                             \
 336   /* Temporary: See 6948537 */                                             \
 337   experimental(bool, UseMemSetInBOT, true,                                  \
 338           "(Unstable) uses memset in BOT updates in GC code")               \
 339                                                                             \
 340   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 341           "Enable normal processing of flags relating to field diagnostics")\
 342                                                                             \
 343   experimental(bool, UnlockExperimentalVMOptions, false,                    \
 344           "Enable normal processing of flags relating to experimental features")\
 345                                                                             \
 346   product(bool, JavaMonitorsInStackTrace, true,                             \
 347           "Print info. about Java monitor locks when the stacks are dumped")\
 348                                                                             \
 349   product_pd(bool, UseLargePages,                                           \
 350           "Use large page memory")                                          \
 351                                                                             \
 352   product_pd(bool, UseLargePagesIndividualAllocation,                       \
 353           "Allocate large pages individually for better affinity")          \
 354                                                                             \
 355   develop(bool, LargePagesIndividualAllocationInjectError, false,           \
 356           "Fail large pages individual allocation")                         \
 357                                                                             \
 358   develop(bool, TracePageSizes, false,                                      \
 359           "Trace page size selection and usage.")                           \
 360                                                                             \
 361   product(bool, UseNUMA, false,                                             \
 362           "Use NUMA if available")                                          \
 363                                                                             \
 364   product(bool, ForceNUMA, false,                                           \
 365           "Force NUMA optimizations on single-node/UMA systems")            \
 366                                                                             \
 367   product(intx, NUMAChunkResizeWeight, 20,                                  \
 368           "Percentage (0-100) used to weight the current sample when "      \
 369           "computing exponentially decaying average for "                   \
 370           "AdaptiveNUMAChunkSizing")                                        \
 371                                                                             \
 372   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 373           "Do not reallocate more that this amount per collection")         \
 374                                                                             \
 375   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 376           "Enable adaptive chunk sizing for NUMA")                          \
 377                                                                             \
 378   product(bool, NUMAStats, false,                                           \
 379           "Print NUMA stats in detailed heap information")                  \
 380                                                                             \
 381   product(intx, NUMAPageScanRate, 256,                                      \
 382           "Maximum number of pages to include in the page scan procedure")  \
 383                                                                             \
 384   product_pd(bool, NeedsDeoptSuspend,                                       \
 385           "True for register window machines (sparc/ia64)")                 \
 386                                                                             \
 387   product(intx, UseSSE, 99,                                                 \
 388           "Highest supported SSE instructions set on x86/x64")              \
 389                                                                             \
 390   product(uintx, LargePageSizeInBytes, 0,                                   \
 391           "Large page size (0 to let VM choose the page size")              \
 392                                                                             \
 393   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 394           "Use large pages if max heap is at least this big")               \
 395                                                                             \
 396   product(bool, ForceTimeHighResolution, false,                             \
 397           "Using high time resolution(For Win32 only)")                     \
 398                                                                             \
 399   develop(bool, TraceItables, false,                                        \
 400           "Trace initialization and use of itables")                        \
 401                                                                             \
 402   develop(bool, TracePcPatching, false,                                     \
 403           "Trace usage of frame::patch_pc")                                 \
 404                                                                             \
 405   develop(bool, TraceJumps, false,                                          \
 406           "Trace assembly jumps in thread ring buffer")                     \
 407                                                                             \
 408   develop(bool, TraceRelocator, false,                                      \
 409           "Trace the bytecode relocator")                                   \
 410                                                                             \
 411   develop(bool, TraceLongCompiles, false,                                   \
 412           "Print out every time compilation is longer than "                \
 413           "a given threashold")                                             \
 414                                                                             \
 415   develop(bool, SafepointALot, false,                                       \
 416           "Generates a lot of safepoints. Works with "                      \
 417           "GuaranteedSafepointInterval")                                    \
 418                                                                             \
 419   product_pd(bool, BackgroundCompilation,                                   \
 420           "A thread requesting compilation is not blocked during "          \
 421           "compilation")                                                    \
 422                                                                             \
 423   product(bool, PrintVMQWaitTime, false,                                    \
 424           "Prints out the waiting time in VM operation queue")              \
 425                                                                             \
 426   develop(bool, BailoutToInterpreterForThrows, false,                       \
 427           "Compiled methods which throws/catches exceptions will be "       \
 428           "deopt and intp.")                                                \
 429                                                                             \
 430   develop(bool, NoYieldsInMicrolock, false,                                 \
 431           "Disable yields in microlock")                                    \
 432                                                                             \
 433   develop(bool, TraceOopMapGeneration, false,                               \
 434           "Shows oopmap generation")                                        \
 435                                                                             \
 436   product(bool, MethodFlushing, true,                                       \
 437           "Reclamation of zombie and not-entrant methods")                  \
 438                                                                             \
 439   develop(bool, VerifyStack, false,                                         \
 440           "Verify stack of each thread when it is entering a runtime call") \
 441                                                                             \
 442   develop(bool, ForceUnreachable, false,                                    \
 443           "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
 444                                                                             \
 445   notproduct(bool, StressDerivedPointers, false,                            \
 446           "Force scavenge when a derived pointers is detected on stack "    \
 447           "after rtm call")                                                 \
 448                                                                             \
 449   develop(bool, TraceDerivedPointers, false,                                \
 450           "Trace traversal of derived pointers on stack")                   \
 451                                                                             \
 452   notproduct(bool, TraceCodeBlobStacks, false,                              \
 453           "Trace stack-walk of codeblobs")                                  \
 454                                                                             \
 455   product(bool, PrintJNIResolving, false,                                   \
 456           "Used to implement -v:jni")                                       \
 457                                                                             \
 458   notproduct(bool, PrintRewrites, false,                                    \
 459           "Print methods that are being rewritten")                         \
 460                                                                             \
 461   product(bool, UseInlineCaches, true,                                      \
 462           "Use Inline Caches for virtual calls ")                           \
 463                                                                             \
 464   develop(bool, InlineArrayCopy, true,                                      \
 465           "inline arraycopy native that is known to be part of "            \
 466           "base library DLL")                                               \
 467                                                                             \
 468   develop(bool, InlineObjectHash, true,                                     \
 469           "inline Object::hashCode() native that is known to be part "      \
 470           "of base library DLL")                                            \
 471                                                                             \
 472   develop(bool, InlineObjectCopy, true,                                     \
 473           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 474                                                                             \
 475   develop(bool, InlineNatives, true,                                        \
 476           "inline natives that are known to be part of base library DLL")   \
 477                                                                             \
 478   develop(bool, InlineMathNatives, true,                                    \
 479           "inline SinD, CosD, etc.")                                        \
 480                                                                             \
 481   develop(bool, InlineClassNatives, true,                                   \
 482           "inline Class.isInstance, etc")                                   \
 483                                                                             \
 484   develop(bool, InlineAtomicLong, true,                                     \
 485           "inline sun.misc.AtomicLong")                                     \
 486                                                                             \
 487   develop(bool, InlineThreadNatives, true,                                  \
 488           "inline Thread.currentThread, etc")                               \
 489                                                                             \
 490   develop(bool, InlineReflectionGetCallerClass, true,                       \
 491           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 492           "of base library DLL")                                            \
 493                                                                             \
 494   develop(bool, InlineUnsafeOps, true,                                      \
 495           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 496                                                                             \
 497   develop(bool, ConvertCmpD2CmpF, true,                                     \
 498           "Convert cmpD to cmpF when one input is constant in float range") \
 499                                                                             \
 500   develop(bool, ConvertFloat2IntClipping, true,                             \
 501           "Convert float2int clipping idiom to integer clipping")           \
 502                                                                             \
 503   develop(bool, SpecialStringCompareTo, true,                               \
 504           "special version of string compareTo")                            \
 505                                                                             \
 506   develop(bool, SpecialStringIndexOf, true,                                 \
 507           "special version of string indexOf")                              \
 508                                                                             \
 509   develop(bool, SpecialStringEquals, true,                                  \
 510           "special version of string equals")                               \
 511                                                                             \
 512   develop(bool, SpecialArraysEquals, true,                                  \
 513           "special version of Arrays.equals(char[],char[])")                \
 514                                                                             \
 515   product(bool, UseSSE42Intrinsics, false,                                  \
 516           "SSE4.2 versions of intrinsics")                                  \
 517                                                                             \
 518   develop(bool, TraceCallFixup, false,                                      \
 519           "traces all call fixups")                                         \
 520                                                                             \
 521   develop(bool, DeoptimizeALot, false,                                      \
 522           "deoptimize at every exit from the runtime system")               \
 523                                                                             \
 524   notproduct(ccstrlist, DeoptimizeOnlyAt, "",                               \
 525           "a comma separated list of bcis to deoptimize at")                \
 526                                                                             \
 527   product(bool, DeoptimizeRandom, false,                                    \
 528           "deoptimize random frames on random exit from the runtime system")\
 529                                                                             \
 530   notproduct(bool, ZombieALot, false,                                       \
 531           "creates zombies (non-entrant) at exit from the runt. system")    \
 532                                                                             \
 533   notproduct(bool, WalkStackALot, false,                                    \
 534           "trace stack (no print) at every exit from the runtime system")   \
 535                                                                             \
 536   develop(bool, Debugging, false,                                           \
 537           "set when executing debug methods in debug.ccp "                  \
 538           "(to prevent triggering assertions)")                             \
 539                                                                             \
 540   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 541           "Enable strict checks that safepoints cannot happen for threads " \
 542           "that used No_Safepoint_Verifier")                                \
 543                                                                             \
 544   notproduct(bool, VerifyLastFrame, false,                                  \
 545           "Verify oops on last frame on entry to VM")                       \
 546                                                                             \
 547   develop(bool, TraceHandleAllocation, false,                               \
 548           "Prints out warnings when suspicious many handles are allocated") \
 549                                                                             \
 550   product(bool, UseCompilerSafepoints, true,                                \
 551           "Stop at safepoints in compiled code")                            \
 552                                                                             \
 553   product(bool, UseSplitVerifier, true,                                     \
 554           "use split verifier with StackMapTable attributes")               \
 555                                                                             \
 556   product(bool, FailOverToOldVerifier, true,                                \
 557           "fail over to old verifier when split verifier fails")            \
 558                                                                             \
 559   develop(bool, ShowSafepointMsgs, false,                                   \
 560           "Show msg. about safepoint synch.")                               \
 561                                                                             \
 562   product(bool, SafepointTimeout, false,                                    \
 563           "Time out and warn or fail after SafepointTimeoutDelay "          \
 564           "milliseconds if failed to reach safepoint")                      \
 565                                                                             \
 566   develop(bool, DieOnSafepointTimeout, false,                               \
 567           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 568                                                                             \
 569   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 570   /* typically, at most a few retries are needed */                         \
 571   product(intx, SuspendRetryCount, 50,                                      \
 572           "Maximum retry count for an external suspend request")            \
 573                                                                             \
 574   product(intx, SuspendRetryDelay, 5,                                       \
 575           "Milliseconds to delay per retry (* current_retry_count)")        \
 576                                                                             \
 577   product(bool, AssertOnSuspendWaitFailure, false,                          \
 578           "Assert/Guarantee on external suspend wait failure")              \
 579                                                                             \
 580   product(bool, TraceSuspendWaitFailures, false,                            \
 581           "Trace external suspend wait failures")                           \
 582                                                                             \
 583   product(bool, MaxFDLimit, true,                                           \
 584           "Bump the number of file descriptors to max in solaris.")         \
 585                                                                             \
 586   notproduct(bool, LogEvents, trueInDebug,                                  \
 587           "Enable Event log")                                               \
 588                                                                             \
 589   product(bool, BytecodeVerificationRemote, true,                           \
 590           "Enables the Java bytecode verifier for remote classes")          \
 591                                                                             \
 592   product(bool, BytecodeVerificationLocal, false,                           \
 593           "Enables the Java bytecode verifier for local classes")           \
 594                                                                             \
 595   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 596           "Force exceptions on FP stack under/overflow")                    \
 597                                                                             \
 598   develop(bool, SoftMatchFailure, trueInProduct,                            \
 599           "If the DFA fails to match a node, print a message and bail out") \
 600                                                                             \
 601   develop(bool, VerifyStackAtCalls, false,                                  \
 602           "Verify that the stack pointer is unchanged after calls")         \
 603                                                                             \
 604   develop(bool, TraceJavaAssertions, false,                                 \
 605           "Trace java language assertions")                                 \
 606                                                                             \
 607   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 608           "temporary - see javaClasses.cpp")                                \
 609                                                                             \
 610   notproduct(bool, PrintMallocFree, false,                                  \
 611           "Trace calls to C heap malloc/free allocation")                   \
 612                                                                             \
 613   product(bool, PrintOopAddress, false,                                     \
 614           "Always print the location of the oop")                           \
 615                                                                             \
 616   notproduct(bool, VerifyCodeCacheOften, false,                             \
 617           "Verify compiled-code cache often")                               \
 618                                                                             \
 619   develop(bool, ZapDeadCompiledLocals, false,                               \
 620           "Zap dead locals in compiler frames")                             \
 621                                                                             \
 622   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 623           "Zap dead locals (old version, zaps all frames when "             \
 624           "entering the VM")                                                \
 625                                                                             \
 626   notproduct(bool, CheckOopishValues, false,                                \
 627           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 628                                                                             \
 629   develop(bool, UseMallocOnly, false,                                       \
 630           "use only malloc/free for allocation (no resource area/arena)")   \
 631                                                                             \
 632   develop(bool, PrintMalloc, false,                                         \
 633           "print all malloc/free calls")                                    \
 634                                                                             \
 635   develop(bool, ZapResourceArea, trueInDebug,                               \
 636           "Zap freed resource/arena space with 0xABABABAB")                 \
 637                                                                             \
 638   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 639           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 640                                                                             \
 641   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 642           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 643                                                                             \
 644   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 645           "Zap unused heap space with 0xBAADBABE")                          \
 646                                                                             \
 647   develop(bool, TraceZapUnusedHeapArea, false,                              \
 648           "Trace zapping of unused heap space")                             \
 649                                                                             \
 650   develop(bool, CheckZapUnusedHeapArea, false,                              \
 651           "Check zapping of unused heap space")                             \
 652                                                                             \
 653   develop(bool, ZapFillerObjects, trueInDebug,                              \
 654           "Zap filler objects with 0xDEAFBABE")                             \
 655                                                                             \
 656   develop(bool, PrintVMMessages, true,                                      \
 657           "Print vm messages on console")                                   \
 658                                                                             \
 659   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 660           "Print the time the application has been running")                \
 661                                                                             \
 662   product(bool, PrintGCApplicationStoppedTime, false,                       \
 663           "Print the time the application has been stopped")                \
 664                                                                             \
 665   notproduct(uintx, ErrorHandlerTest, 0,                                    \
 666           "If > 0, provokes an error after VM initialization; the value"    \
 667           "determines which error to provoke.  See test_error_handler()"    \
 668           "in debug.cpp.")                                                  \
 669                                                                             \
 670   develop(bool, Verbose, false,                                             \
 671           "Prints additional debugging information from other modes")       \
 672                                                                             \
 673   develop(bool, PrintMiscellaneous, false,                                  \
 674           "Prints uncategorized debugging information (requires +Verbose)") \
 675                                                                             \
 676   develop(bool, WizardMode, false,                                          \
 677           "Prints much more debugging information")                         \
 678                                                                             \
 679   product(bool, ShowMessageBoxOnError, false,                               \
 680           "Keep process alive on VM fatal error")                           \
 681                                                                             \
 682   product_pd(bool, UseOSErrorReporting,                                     \
 683           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 684                                                                             \
 685   product(bool, SuppressFatalErrorMessage, false,                           \
 686           "Do NO Fatal Error report [Avoid deadlock]")                      \
 687                                                                             \
 688   product(ccstrlist, OnError, "",                                           \
 689           "Run user-defined commands on fatal error; see VMError.cpp "      \
 690           "for examples")                                                   \
 691                                                                             \
 692   product(ccstrlist, OnOutOfMemoryError, "",                                \
 693           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 694                                                                             \
 695   manageable(bool, HeapDumpBeforeFullGC, false,                             \
 696           "Dump heap to file before any major stop-world GC")               \
 697                                                                             \
 698   manageable(bool, HeapDumpAfterFullGC, false,                              \
 699           "Dump heap to file after any major stop-world GC")                \
 700                                                                             \
 701   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 702           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 703                                                                             \
 704   manageable(ccstr, HeapDumpPath, NULL,                                     \
 705           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 706           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 707           "in the working directory)")                                      \
 708                                                                             \
 709   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 710           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 711           "when the heap usage is larger than this")                        \
 712                                                                             \
 713   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 714           "Approximate segment size when generating a segmented heap dump") \
 715                                                                             \
 716   develop(bool, BreakAtWarning, false,                                      \
 717           "Execute breakpoint upon encountering VM warning")                \
 718                                                                             \
 719   product_pd(bool, UseVectoredExceptions,                                   \
 720           "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
 721                                                                             \
 722   develop(bool, TraceVMOperation, false,                                    \
 723           "Trace vm operations")                                            \
 724                                                                             \
 725   develop(bool, UseFakeTimers, false,                                       \
 726           "Tells whether the VM should use system time or a fake timer")    \
 727                                                                             \
 728   diagnostic(bool, LogCompilation, false,                                   \
 729           "Log compilation activity in detail to hotspot.log or LogFile")   \
 730                                                                             \
 731   product(bool, PrintCompilation, false,                                    \
 732           "Print compilations")                                             \
 733                                                                             \
 734   diagnostic(bool, TraceNMethodInstalls, false,                             \
 735              "Trace nmethod intallation")                                   \
 736                                                                             \
 737   diagnostic(intx, ScavengeRootsInCode, 0,                                  \
 738              "0: do not allow scavengable oops in the code cache; "         \
 739              "1: allow scavenging from the code cache; "                    \
 740              "2: emit as many constants as the compiler can see")           \
 741                                                                             \
 742   diagnostic(bool, TraceOSRBreakpoint, false,                               \
 743              "Trace OSR Breakpoint ")                                       \
 744                                                                             \
 745   diagnostic(bool, TraceCompileTriggered, false,                            \
 746              "Trace compile triggered")                                     \
 747                                                                             \
 748   diagnostic(bool, TraceTriggers, false,                                    \
 749              "Trace triggers")                                              \
 750                                                                             \
 751   product(bool, AlwaysRestoreFPU, false,                                    \
 752           "Restore the FPU control word after every JNI call (expensive)")  \
 753                                                                             \
 754   notproduct(bool, PrintCompilation2, false,                                \
 755           "Print additional statistics per compilation")                    \
 756                                                                             \
 757   diagnostic(bool, PrintAdapterHandlers, false,                             \
 758           "Print code generated for i2c/c2i adapters")                      \
 759                                                                             \
 760   develop(bool, VerifyAdapterSharing, false,                                \
 761           "Verify that the code for shared adapters is the equivalent")     \
 762                                                                             \
 763   diagnostic(bool, PrintAssembly, false,                                    \
 764           "Print assembly code (using external disassembler.so)")           \
 765                                                                             \
 766   diagnostic(ccstr, PrintAssemblyOptions, NULL,                             \
 767           "Options string passed to disassembler.so")                       \
 768                                                                             \
 769   diagnostic(bool, PrintNMethods, false,                                    \
 770           "Print assembly code for nmethods when generated")                \
 771                                                                             \
 772   diagnostic(bool, PrintNativeNMethods, false,                              \
 773           "Print assembly code for native nmethods when generated")         \
 774                                                                             \
 775   develop(bool, PrintDebugInfo, false,                                      \
 776           "Print debug information for all nmethods when generated")        \
 777                                                                             \
 778   develop(bool, PrintRelocations, false,                                    \
 779           "Print relocation information for all nmethods when generated")   \
 780                                                                             \
 781   develop(bool, PrintDependencies, false,                                   \
 782           "Print dependency information for all nmethods when generated")   \
 783                                                                             \
 784   develop(bool, PrintExceptionHandlers, false,                              \
 785           "Print exception handler tables for all nmethods when generated") \
 786                                                                             \
 787   develop(bool, InterceptOSException, false,                                \
 788           "Starts debugger when an implicit OS (e.g., NULL) "               \
 789           "exception happens")                                              \
 790                                                                             \
 791   notproduct(bool, PrintCodeCache, false,                                   \
 792           "Print the compiled_code cache when exiting")                     \
 793                                                                             \
 794   develop(bool, PrintCodeCache2, false,                                     \
 795           "Print detailed info on the compiled_code cache when exiting")    \
 796                                                                             \
 797   diagnostic(bool, PrintStubCode, false,                                    \
 798           "Print generated stub code")                                      \
 799                                                                             \
 800   product(bool, StackTraceInThrowable, true,                                \
 801           "Collect backtrace in throwable when exception happens")          \
 802                                                                             \
 803   product(bool, OmitStackTraceInFastThrow, true,                            \
 804           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 805                                                                             \
 806   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 807           "Prints byte code statictics when dumping profiler output")       \
 808                                                                             \
 809   product(bool, ProfilerRecordPC, false,                                    \
 810           "Collects tick for each 16 byte interval of compiled code")       \
 811                                                                             \
 812   product(bool, ProfileVM, false,                                           \
 813           "Profiles ticks that fall within VM (either in the VM Thread "    \
 814           "or VM code called through stubs)")                               \
 815                                                                             \
 816   product(bool, ProfileIntervals, false,                                    \
 817           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 818                                                                             \
 819   notproduct(bool, ProfilerCheckIntervals, false,                           \
 820           "Collect and print info on spacing of profiler ticks")            \
 821                                                                             \
 822   develop(bool, PrintJVMWarnings, false,                                    \
 823           "Prints warnings for unimplemented JVM functions")                \
 824                                                                             \
 825   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 826           "Prints warnings for stalled SpinLocks")                          \
 827                                                                             \
 828   develop(bool, InitializeJavaLangSystem, true,                             \
 829           "Initialize java.lang.System - turn off for individual "          \
 830           "method debugging")                                               \
 831                                                                             \
 832   develop(bool, InitializeJavaLangString, true,                             \
 833           "Initialize java.lang.String - turn off for individual "          \
 834           "method debugging")                                               \
 835                                                                             \
 836   develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
 837           "Initialize various error and exception classes - turn off for "  \
 838           "individual method debugging")                                    \
 839                                                                             \
 840   product(bool, RegisterFinalizersAtInit, true,                             \
 841           "Register finalizable objects at end of Object.<init> or "        \
 842           "after allocation")                                               \
 843                                                                             \
 844   develop(bool, RegisterReferences, true,                                   \
 845           "Tells whether the VM should register soft/weak/final/phantom "   \
 846           "references")                                                     \
 847                                                                             \
 848   develop(bool, IgnoreRewrites, false,                                      \
 849           "Supress rewrites of bytecodes in the oopmap generator. "         \
 850           "This is unsafe!")                                                \
 851                                                                             \
 852   develop(bool, PrintCodeCacheExtension, false,                             \
 853           "Print extension of code cache")                                  \
 854                                                                             \
 855   develop(bool, UsePrivilegedStack, true,                                   \
 856           "Enable the security JVM functions")                              \
 857                                                                             \
 858   develop(bool, IEEEPrecision, true,                                        \
 859           "Enables IEEE precision (for INTEL only)")                        \
 860                                                                             \
 861   develop(bool, ProtectionDomainVerification, true,                         \
 862           "Verifies protection domain before resolution in system "         \
 863           "dictionary")                                                     \
 864                                                                             \
 865   product(bool, ClassUnloading, true,                                       \
 866           "Do unloading of classes")                                        \
 867                                                                             \
 868   diagnostic(bool, LinkWellKnownClasses, false,                             \
 869           "Resolve a well known class as soon as its name is seen")         \
 870                                                                             \
 871   develop(bool, DisableStartThread, false,                                  \
 872           "Disable starting of additional Java threads "                    \
 873           "(for debugging only)")                                           \
 874                                                                             \
 875   develop(bool, MemProfiling, false,                                        \
 876           "Write memory usage profiling to log file")                       \
 877                                                                             \
 878   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 879           "Prints the system dictionary at exit")                           \
 880                                                                             \
 881   diagnostic(bool, UnsyncloadClass, false,                                  \
 882           "Unstable: VM calls loadClass unsynchronized. Custom "            \
 883           "class loader  must call VM synchronized for findClass "          \
 884           "and defineClass.")                                               \
 885                                                                             \
 886   product(bool, AlwaysLockClassLoader, false,                               \
 887           "Require the VM to acquire the class loader lock before calling " \
 888           "loadClass() even for class loaders registering "                 \
 889           "as parallel capable")                                            \
 890                                                                             \
 891   product(bool, AllowParallelDefineClass, false,                            \
 892           "Allow parallel defineClass requests for class loaders "          \
 893           "registering as parallel capable")                                \
 894                                                                             \
 895   product(bool, MustCallLoadClassInternal, false,                           \
 896           "Call loadClassInternal() rather than loadClass()")               \
 897                                                                             \
 898   product_pd(bool, DontYieldALot,                                           \
 899           "Throw away obvious excess yield calls (for SOLARIS only)")       \
 900                                                                             \
 901   product_pd(bool, ConvertSleepToYield,                                     \
 902           "Converts sleep(0) to thread yield "                              \
 903           "(may be off for SOLARIS to improve GUI)")                        \
 904                                                                             \
 905   product(bool, ConvertYieldToSleep, false,                                 \
 906           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
 907           "behavior (SOLARIS only)")                                        \
 908                                                                             \
 909   product(bool, UseBoundThreads, true,                                      \
 910           "Bind user level threads to kernel threads (for SOLARIS only)")   \
 911                                                                             \
 912   develop(bool, UseDetachedThreads, true,                                   \
 913           "Use detached threads that are recycled upon termination "        \
 914           "(for SOLARIS only)")                                             \
 915                                                                             \
 916   product(bool, UseLWPSynchronization, true,                                \
 917           "Use LWP-based instead of libthread-based synchronization "       \
 918           "(SPARC only)")                                                   \
 919                                                                             \
 920   product(ccstr, SyncKnobs, NULL,                                           \
 921           "(Unstable) Various monitor synchronization tunables")            \
 922                                                                             \
 923   product(intx, EmitSync, 0,                                                \
 924           "(Unsafe,Unstable) "                                              \
 925           " Controls emission of inline sync fast-path code")               \
 926                                                                             \
 927   product(intx, AlwaysInflate, 0, "(Unstable) Force inflation")             \
 928                                                                             \
 929   product(intx, MonitorBound, 0, "Bound Monitor population")                \
 930                                                                             \
 931   product(bool, MonitorInUseLists, false, "Track Monitors for Deflation")   \
 932                                                                             \
 933   product(intx, Atomics, 0,                                                 \
 934           "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
 935                                                                             \
 936   product(intx, FenceInstruction, 0,                                        \
 937           "(Unsafe,Unstable) Experimental")                                 \
 938                                                                             \
 939   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
 940                                                                             \
 941   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
 942                                                                             \
 943   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
 944                                                                             \
 945   product(intx, hashCode, 0,                                                \
 946          "(Unstable) select hashCode generation algorithm" )                \
 947                                                                             \
 948   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
 949          "(Unstable, Linux-specific)"                                       \
 950          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
 951                                                                             \
 952   product(bool, FilterSpuriousWakeups, true,                                \
 953           "Prevent spurious or premature wakeups from object.wait "         \
 954           "(Solaris only)")                                                 \
 955                                                                             \
 956   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
 957   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
 958   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
 959                                                                             \
 960   develop(bool, UsePthreads, false,                                         \
 961           "Use pthread-based instead of libthread-based synchronization "   \
 962           "(SPARC only)")                                                   \
 963                                                                             \
 964   product(bool, AdjustConcurrency, false,                                   \
 965           "call thr_setconcurrency at thread create time to avoid "         \
 966           "LWP starvation on MP systems (For Solaris Only)")                \
 967                                                                             \
 968   develop(bool, UpdateHotSpotCompilerFileOnError, true,                     \
 969           "Should the system attempt to update the compiler file when "     \
 970           "an error occurs?")                                               \
 971                                                                             \
 972   product(bool, ReduceSignalUsage, false,                                   \
 973           "Reduce the use of OS signals in Java and/or the VM")             \
 974                                                                             \
 975   notproduct(bool, ValidateMarkSweep, false,                                \
 976           "Do extra validation during MarkSweep collection")                \
 977                                                                             \
 978   notproduct(bool, RecordMarkSweepCompaction, false,                        \
 979           "Enable GC-to-GC recording and querying of compaction during "    \
 980           "MarkSweep")                                                      \
 981                                                                             \
 982   develop_pd(bool, ShareVtableStubs,                                        \
 983           "Share vtable stubs (smaller code but worse branch prediction")   \
 984                                                                             \
 985   develop(bool, LoadLineNumberTables, true,                                 \
 986           "Tells whether the class file parser loads line number tables")   \
 987                                                                             \
 988   develop(bool, LoadLocalVariableTables, true,                              \
 989           "Tells whether the class file parser loads local variable tables")\
 990                                                                             \
 991   develop(bool, LoadLocalVariableTypeTables, true,                          \
 992           "Tells whether the class file parser loads local variable type tables")\
 993                                                                             \
 994   product(bool, AllowUserSignalHandlers, false,                             \
 995           "Do not complain if the application installs signal handlers "    \
 996           "(Solaris & Linux only)")                                         \
 997                                                                             \
 998   product(bool, UseSignalChaining, true,                                    \
 999           "Use signal-chaining to invoke signal handlers installed "        \
1000           "by the application (Solaris & Linux only)")                      \
1001                                                                             \
1002   product(bool, UseAltSigs, false,                                          \
1003           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
1004           "internal signals (Solaris only)")                                \
1005                                                                             \
1006   product(bool, UseSpinning, false,                                         \
1007           "Use spinning in monitor inflation and before entry")             \
1008                                                                             \
1009   product(bool, PreSpinYield, false,                                        \
1010           "Yield before inner spinning loop")                               \
1011                                                                             \
1012   product(bool, PostSpinYield, true,                                        \
1013           "Yield after inner spinning loop")                                \
1014                                                                             \
1015   product(bool, AllowJNIEnvProxy, false,                                    \
1016           "Allow JNIEnv proxies for jdbx")                                  \
1017                                                                             \
1018   product(bool, JNIDetachReleasesMonitors, true,                            \
1019           "JNI DetachCurrentThread releases monitors owned by thread")      \
1020                                                                             \
1021   product(bool, RestoreMXCSROnJNICalls, false,                              \
1022           "Restore MXCSR when returning from JNI calls")                    \
1023                                                                             \
1024   product(bool, CheckJNICalls, false,                                       \
1025           "Verify all arguments to JNI calls")                              \
1026                                                                             \
1027   product(bool, UseFastJNIAccessors, true,                                  \
1028           "Use optimized versions of Get<Primitive>Field")                  \
1029                                                                             \
1030   product(bool, EagerXrunInit, false,                                       \
1031           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
1032           " but not all -Xrun libraries may support the state of the VM at this time") \
1033                                                                             \
1034   product(bool, PreserveAllAnnotations, false,                              \
1035           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
1036                                                                             \
1037   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
1038           "Number of OutOfMemoryErrors preallocated with backtrace")        \
1039                                                                             \
1040   product(bool, LazyBootClassLoader, true,                                  \
1041           "Enable/disable lazy opening of boot class path entries")         \
1042                                                                             \
1043   diagnostic(bool, UseIncDec, true,                                         \
1044           "Use INC, DEC instructions on x86")                               \
1045                                                                             \
1046   product(bool, UseNewLongLShift, false,                                    \
1047           "Use optimized bitwise shift left")                               \
1048                                                                             \
1049   product(bool, UseStoreImmI16, true,                                       \
1050           "Use store immediate 16-bits value instruction on x86")           \
1051                                                                             \
1052   product(bool, UseAddressNop, false,                                       \
1053           "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
1054                                                                             \
1055   product(bool, UseXmmLoadAndClearUpper, true,                              \
1056           "Load low part of XMM register and clear upper part")             \
1057                                                                             \
1058   product(bool, UseXmmRegToRegMoveAll, false,                               \
1059           "Copy all XMM register bits when moving value between registers") \
1060                                                                             \
1061   product(bool, UseXmmI2D, false,                                           \
1062           "Use SSE2 CVTDQ2PD instruction to convert Integer to Double")     \
1063                                                                             \
1064   product(bool, UseXmmI2F, false,                                           \
1065           "Use SSE2 CVTDQ2PS instruction to convert Integer to Float")      \
1066                                                                             \
1067   product(bool, UseXMMForArrayCopy, false,                                  \
1068           "Use SSE2 MOVQ instruction for Arraycopy")                        \
1069                                                                             \
1070   product(bool, UseUnalignedLoadStores, false,                              \
1071           "Use SSE2 MOVDQU instruction for Arraycopy")                      \
1072                                                                             \
1073   product(intx, FieldsAllocationStyle, 1,                                   \
1074           "0 - type based with oops first, 1 - with oops last, "            \
1075           "2 - oops in super and sub classes are together")                 \
1076                                                                             \
1077   product(bool, CompactFields, true,                                        \
1078           "Allocate nonstatic fields in gaps between previous fields")      \
1079                                                                             \
1080   notproduct(bool, PrintCompactFieldsSavings, false,                        \
1081           "Print how many words were saved with CompactFields")             \
1082                                                                             \
1083   product(bool, UseBiasedLocking, true,                                     \
1084           "Enable biased locking in JVM")                                   \
1085                                                                             \
1086   product(intx, BiasedLockingStartupDelay, 4000,                            \
1087           "Number of milliseconds to wait before enabling biased locking")  \
1088                                                                             \
1089   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
1090           "Print statistics of biased locking in JVM")                      \
1091                                                                             \
1092   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
1093           "Threshold of number of revocations per type to try to "          \
1094           "rebias all objects in the heap of that type")                    \
1095                                                                             \
1096   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
1097           "Threshold of number of revocations per type to permanently "     \
1098           "revoke biases of all objects in the heap of that type")          \
1099                                                                             \
1100   product(intx, BiasedLockingDecayTime, 25000,                              \
1101           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
1102           "type after previous bulk rebias")                                \
1103                                                                             \
1104   /* tracing */                                                             \
1105                                                                             \
1106   notproduct(bool, TraceRuntimeCalls, false,                                \
1107           "Trace run-time calls")                                           \
1108                                                                             \
1109   develop(bool, TraceJNICalls, false,                                       \
1110           "Trace JNI calls")                                                \
1111                                                                             \
1112   notproduct(bool, TraceJVMCalls, false,                                    \
1113           "Trace JVM calls")                                                \
1114                                                                             \
1115   product(ccstr, TraceJVMTI, NULL,                                          \
1116           "Trace flags for JVMTI functions and events")                     \
1117                                                                             \
1118   product(bool, ForceFullGCJVMTIEpilogues, false,                           \
1119           "Force 'Full GC' was done semantics for JVMTI GC epilogues")      \
1120                                                                             \
1121   /* This option can change an EMCP method into an obsolete method. */      \
1122   /* This can affect tests that except specific methods to be EMCP. */      \
1123   /* This option should be used with caution. */                            \
1124   product(bool, StressLdcRewrite, false,                                    \
1125           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1126                                                                             \
1127   product(intx, TraceRedefineClasses, 0,                                    \
1128           "Trace level for JVMTI RedefineClasses")                          \
1129                                                                             \
1130   develop(bool, StressMethodComparator, false,                              \
1131           "run the MethodComparator on all loaded methods")                 \
1132                                                                             \
1133   /* change to false by default sometime after Mustang */                   \
1134   product(bool, VerifyMergedCPBytecodes, true,                              \
1135           "Verify bytecodes after RedefineClasses constant pool merging")   \
1136                                                                             \
1137   develop(bool, TraceJNIHandleAllocation, false,                            \
1138           "Trace allocation/deallocation of JNI handle blocks")             \
1139                                                                             \
1140   develop(bool, TraceThreadEvents, false,                                   \
1141           "Trace all thread events")                                        \
1142                                                                             \
1143   develop(bool, TraceBytecodes, false,                                      \
1144           "Trace bytecode execution")                                       \
1145                                                                             \
1146   develop(bool, TraceClassInitialization, false,                            \
1147           "Trace class initialization")                                     \
1148                                                                             \
1149   develop(bool, TraceExceptions, false,                                     \
1150           "Trace exceptions")                                               \
1151                                                                             \
1152   develop(bool, TraceICs, false,                                            \
1153           "Trace inline cache changes")                                     \
1154                                                                             \
1155   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1156           "Trace method invocation counter overflow")                       \
1157                                                                             \
1158   develop(bool, TraceInlineCacheClearing, false,                            \
1159           "Trace clearing of inline caches in nmethods")                    \
1160                                                                             \
1161   develop(bool, TraceDependencies, false,                                   \
1162           "Trace dependencies")                                             \
1163                                                                             \
1164   develop(bool, VerifyDependencies, trueInDebug,                            \
1165          "Exercise and verify the compilation dependency mechanism")        \
1166                                                                             \
1167   develop(bool, TraceNewOopMapGeneration, false,                            \
1168           "Trace OopMapGeneration")                                         \
1169                                                                             \
1170   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1171           "Trace OopMapGeneration: print detailed cell states")             \
1172                                                                             \
1173   develop(bool, TimeOopMap, false,                                          \
1174           "Time calls to GenerateOopMap::compute_map() in sum")             \
1175                                                                             \
1176   develop(bool, TimeOopMap2, false,                                         \
1177           "Time calls to GenerateOopMap::compute_map() individually")       \
1178                                                                             \
1179   develop(bool, TraceMonitorMismatch, false,                                \
1180           "Trace monitor matching failures during OopMapGeneration")        \
1181                                                                             \
1182   develop(bool, TraceOopMapRewrites, false,                                 \
1183           "Trace rewritting of method oops during oop map generation")      \
1184                                                                             \
1185   develop(bool, TraceSafepoint, false,                                      \
1186           "Trace safepoint operations")                                     \
1187                                                                             \
1188   develop(bool, TraceICBuffer, false,                                       \
1189           "Trace usage of IC buffer")                                       \
1190                                                                             \
1191   develop(bool, TraceCompiledIC, false,                                     \
1192           "Trace changes of compiled IC")                                   \
1193                                                                             \
1194   notproduct(bool, TraceZapDeadLocals, false,                               \
1195           "Trace zapping dead locals")                                      \
1196                                                                             \
1197   develop(bool, TraceStartupTime, false,                                    \
1198           "Trace setup time")                                               \
1199                                                                             \
1200   develop(bool, TraceHPI, false,                                            \
1201           "Trace Host Porting Interface (HPI)")                             \
1202                                                                             \
1203   product(ccstr, HPILibPath, NULL,                                          \
1204           "Specify alternate path to HPI library")                          \
1205                                                                             \
1206   develop(bool, TraceProtectionDomainVerification, false,                   \
1207           "Trace protection domain verifcation")                            \
1208                                                                             \
1209   develop(bool, TraceClearedExceptions, false,                              \
1210           "Prints when an exception is forcibly cleared")                   \
1211                                                                             \
1212   product(bool, TraceClassResolution, false,                                \
1213           "Trace all constant pool resolutions (for debugging)")            \
1214                                                                             \
1215   product(bool, TraceBiasedLocking, false,                                  \
1216           "Trace biased locking in JVM")                                    \
1217                                                                             \
1218   product(bool, TraceMonitorInflation, false,                               \
1219           "Trace monitor inflation in JVM")                                 \
1220                                                                             \
1221   /* assembler */                                                           \
1222   product(bool, Use486InstrsOnly, false,                                    \
1223           "Use 80486 Compliant instruction subset")                         \
1224                                                                             \
1225   /* gc */                                                                  \
1226                                                                             \
1227   product(bool, UseSerialGC, false,                                         \
1228           "Use the serial garbage collector")                               \
1229                                                                             \
1230   product(bool, UseG1GC, false,                                             \
1231           "Use the Garbage-First garbage collector")                        \
1232                                                                             \
1233   product(bool, UseParallelGC, false,                                       \
1234           "Use the Parallel Scavenge garbage collector")                    \
1235                                                                             \
1236   product(bool, UseParallelOldGC, false,                                    \
1237           "Use the Parallel Old garbage collector")                         \
1238                                                                             \
1239   product(bool, UseParallelOldGCCompacting, true,                           \
1240           "In the Parallel Old garbage collector use parallel compaction")  \
1241                                                                             \
1242   product(bool, UseParallelDensePrefixUpdate, true,                         \
1243           "In the Parallel Old garbage collector use parallel dense"        \
1244           " prefix update")                                                 \
1245                                                                             \
1246   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1247           "How often should we maximally compact the heap (not allowing "   \
1248           "any dead space)")                                                \
1249                                                                             \
1250   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1251           "The collection count for the first maximum compaction")          \
1252                                                                             \
1253   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1254           "In the Parallel Old garbage collector maximum compaction for "   \
1255           "a system GC")                                                    \
1256                                                                             \
1257   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1258           "The mean used by the par compact dead wood"                      \
1259           "limiter (a number between 0-100).")                              \
1260                                                                             \
1261   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1262           "The standard deviation used by the par compact dead wood"        \
1263           "limiter (a number between 0-100).")                              \
1264                                                                             \
1265   product(bool, UseParallelOldGCDensePrefix, true,                          \
1266           "Use a dense prefix with the Parallel Old garbage collector")     \
1267                                                                             \
1268   product(uintx, ParallelGCThreads, 0,                                      \
1269           "Number of parallel threads parallel gc will use")                \
1270                                                                             \
1271   develop(bool, ParallelOldGCSplitALot, false,                              \
1272           "Provoke splitting (copying data from a young gen space to"       \
1273           "multiple destination spaces)")                                   \
1274                                                                             \
1275   develop(uintx, ParallelOldGCSplitInterval, 3,                             \
1276           "How often to provoke splitting a young gen space")               \
1277                                                                             \
1278   develop(bool, TraceRegionTasksQueuing, false,                             \
1279           "Trace the queuing of the region tasks")                          \
1280                                                                             \
1281   product(uintx, ConcGCThreads, 0,                                          \
1282           "Number of threads concurrent gc will use")                       \
1283                                                                             \
1284   product(uintx, YoungPLABSize, 4096,                                       \
1285           "Size of young gen promotion labs (in HeapWords)")                \
1286                                                                             \
1287   product(uintx, OldPLABSize, 1024,                                         \
1288           "Size of old gen promotion labs (in HeapWords)")                  \
1289                                                                             \
1290   product(uintx, GCTaskTimeStampEntries, 200,                               \
1291           "Number of time stamp entries per gc worker thread")              \
1292                                                                             \
1293   product(bool, AlwaysTenure, false,                                        \
1294           "Always tenure objects in eden. (ParallelGC only)")               \
1295                                                                             \
1296   product(bool, NeverTenure, false,                                         \
1297           "Never tenure objects in eden, May tenure on overflow "           \
1298           "(ParallelGC only)")                                              \
1299                                                                             \
1300   product(bool, ScavengeBeforeFullGC, true,                                 \
1301           "Scavenge youngest generation before each full GC, "              \
1302           "used with UseParallelGC")                                        \
1303                                                                             \
1304   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1305           "Allow scavenges to occur when to_space contains objects.")       \
1306                                                                             \
1307   product(bool, UseConcMarkSweepGC, false,                                  \
1308           "Use Concurrent Mark-Sweep GC in the old generation")             \
1309                                                                             \
1310   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1311           "A System.gc() request invokes a concurrent collection;"          \
1312           " (effective only when UseConcMarkSweepGC)")                      \
1313                                                                             \
1314   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1315           "A System.gc() request invokes a concurrent collection and "      \
1316           "also unloads classes during such a concurrent gc cycle "         \
1317           "(effective only when UseConcMarkSweepGC)")                       \
1318                                                                             \
1319   product(bool, GCLockerInvokesConcurrent, false,                           \
1320           "The exit of a JNI CS necessitating a scavenge also"              \
1321           " kicks off a bkgrd concurrent collection")                       \
1322                                                                             \
1323   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1324           "Use Adaptive Free Lists in the CMS generation")                  \
1325                                                                             \
1326   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1327           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1328                                                                             \
1329   develop(bool, RotateCMSCollectionTypes, false,                            \
1330           "Rotate the CMS collections among concurrent and STW")            \
1331                                                                             \
1332   product(bool, UseCMSBestFit, true,                                        \
1333           "Use CMS best fit allocation strategy")                           \
1334                                                                             \
1335   product(bool, UseCMSCollectionPassing, true,                              \
1336           "Use passing of collection from background to foreground")        \
1337                                                                             \
1338   product(bool, UseParNewGC, false,                                         \
1339           "Use parallel threads in the new generation.")                    \
1340                                                                             \
1341   product(bool, ParallelGCVerbose, false,                                   \
1342           "Verbose output for parallel GC.")                                \
1343                                                                             \
1344   product(intx, ParallelGCBufferWastePct, 10,                               \
1345           "wasted fraction of parallel allocation buffer.")                 \
1346                                                                             \
1347   product(bool, ParallelGCRetainPLAB, true,                                 \
1348           "Retain parallel allocation buffers across scavenges.")           \
1349                                                                             \
1350   product(intx, TargetPLABWastePct, 10,                                     \
1351           "target wasted space in last buffer as pct of overall allocation")\
1352                                                                             \
1353   product(uintx, PLABWeight, 75,                                            \
1354           "Percentage (0-100) used to weight the current sample when"       \
1355           "computing exponentially decaying average for ResizePLAB.")       \
1356                                                                             \
1357   product(bool, ResizePLAB, true,                                           \
1358           "Dynamically resize (survivor space) promotion labs")             \
1359                                                                             \
1360   product(bool, PrintPLAB, false,                                           \
1361           "Print (survivor space) promotion labs sizing decisions")         \
1362                                                                             \
1363   product(intx, ParGCArrayScanChunk, 50,                                    \
1364           "Scan a subset and push remainder, if array is bigger than this") \
1365                                                                             \
1366   product(bool, ParGCUseLocalOverflow, false,                               \
1367           "Instead of a global overflow list, use local overflow stacks")   \
1368                                                                             \
1369   product(bool, ParGCTrimOverflow, true,                                    \
1370           "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \
1371                                                                             \
1372   notproduct(bool, ParGCWorkQueueOverflowALot, false,                       \
1373           "Whether we should simulate work queue overflow in ParNew")       \
1374                                                                             \
1375   notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000,                   \
1376           "An `interval' counter that determines how frequently "           \
1377           "we simulate overflow; a smaller number increases frequency")     \
1378                                                                             \
1379   product(uintx, ParGCDesiredObjsFromOverflowList, 20,                      \
1380           "The desired number of objects to claim from the overflow list")  \
1381                                                                             \
1382   product(uintx, CMSParPromoteBlocksToClaim, 16,                             \
1383           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1384           "parallel GC.")                                                   \
1385                                                                             \
1386   product(uintx, OldPLABWeight, 50,                                         \
1387           "Percentage (0-100) used to weight the current sample when"       \
1388           "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \
1389                                                                             \
1390   product(bool, ResizeOldPLAB, true,                                        \
1391           "Dynamically resize (old gen) promotion labs")                    \
1392                                                                             \
1393   product(bool, PrintOldPLAB, false,                                        \
1394           "Print (old gen) promotion labs sizing decisions")                \
1395                                                                             \
1396   product(uintx, CMSOldPLABMin, 16,                                         \
1397           "Min size of CMS gen promotion lab caches per worker per blksize")\
1398                                                                             \
1399   product(uintx, CMSOldPLABMax, 1024,                                       \
1400           "Max size of CMS gen promotion lab caches per worker per blksize")\
1401                                                                             \
1402   product(uintx, CMSOldPLABNumRefills, 4,                                   \
1403           "Nominal number of refills of CMS gen promotion lab cache"        \
1404           " per worker per block size")                                     \
1405                                                                             \
1406   product(bool, CMSOldPLABResizeQuicker, false,                             \
1407           "Whether to react on-the-fly during a scavenge to a sudden"       \
1408           " change in block demand rate")                                   \
1409                                                                             \
1410   product(uintx, CMSOldPLABToleranceFactor, 4,                              \
1411           "The tolerance of the phase-change detector for on-the-fly"       \
1412           " PLAB resizing during a scavenge")                               \
1413                                                                             \
1414   product(uintx, CMSOldPLABReactivityFactor, 2,                             \
1415           "The gain in the feedback loop for on-the-fly PLAB resizing"      \
1416           " during a scavenge")                                             \
1417                                                                             \
1418   product(uintx, CMSOldPLABReactivityCeiling, 10,                           \
1419           "The clamping of the gain in the feedback loop for on-the-fly"    \
1420           " PLAB resizing during a scavenge")                               \
1421                                                                             \
1422   product(bool, AlwaysPreTouch, false,                                      \
1423           "It forces all freshly committed pages to be pre-touched.")       \
1424                                                                             \
1425   product(bool, CMSUseOldDefaults, false,                                   \
1426           "A flag temporarily introduced to allow reverting to some "       \
1427           "older default settings; older as of 6.0")                        \
1428                                                                             \
1429   product(intx, CMSYoungGenPerWorker, 16*M,                                 \
1430           "The amount of young gen chosen by default per GC worker "        \
1431           "thread available")                                               \
1432                                                                             \
1433   product(bool, GCOverheadReporting, false,                                 \
1434          "Enables the GC overhead reporting facility")                      \
1435                                                                             \
1436   product(intx, GCOverheadReportingPeriodMS, 100,                           \
1437           "Reporting period for conc GC overhead reporting, in ms ")        \
1438                                                                             \
1439   product(bool, CMSIncrementalMode, false,                                  \
1440           "Whether CMS GC should operate in \"incremental\" mode")          \
1441                                                                             \
1442   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1443           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1444           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1445           "value")                                                          \
1446                                                                             \
1447   product(bool, CMSIncrementalPacing, true,                                 \
1448           "Whether the CMS incremental mode duty cycle should be "          \
1449           "automatically adjusted")                                         \
1450                                                                             \
1451   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1452           "Lower bound on the duty cycle when CMSIncrementalPacing is "     \
1453           "enabled (a percentage, 0-100)")                                  \
1454                                                                             \
1455   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1456           "Percentage (0-100) used to add conservatism when computing the " \
1457           "duty cycle")                                                     \
1458                                                                             \
1459   product(uintx, CMSIncrementalOffset, 0,                                   \
1460           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1461           " is shifted to the right within the period between young GCs")   \
1462                                                                             \
1463   product(uintx, CMSExpAvgFactor, 50,                                       \
1464           "Percentage (0-100) used to weight the current sample when"       \
1465           "computing exponential averages for CMS statistics.")             \
1466                                                                             \
1467   product(uintx, CMS_FLSWeight, 75,                                         \
1468           "Percentage (0-100) used to weight the current sample when"       \
1469           "computing exponentially decating averages for CMS FLS statistics.") \
1470                                                                             \
1471   product(uintx, CMS_FLSPadding, 1,                                         \
1472           "The multiple of deviation from mean to use for buffering"        \
1473           "against volatility in free list demand.")                        \
1474                                                                             \
1475   product(uintx, FLSCoalescePolicy, 2,                                      \
1476           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1477                                                                             \
1478   product(bool, FLSAlwaysCoalesceLarge, false,                              \
1479           "CMS: Larger free blocks are always available for coalescing")    \
1480                                                                             \
1481   product(double, FLSLargestBlockCoalesceProximity, 0.99,                   \
1482           "CMS: the smaller the percentage the greater the coalition force")\
1483                                                                             \
1484   product(double, CMSSmallCoalSurplusPercent, 1.05,                         \
1485           "CMS: the factor by which to inflate estimated demand of small"   \
1486           " block sizes to prevent coalescing with an adjoining block")     \
1487                                                                             \
1488   product(double, CMSLargeCoalSurplusPercent, 0.95,                         \
1489           "CMS: the factor by which to inflate estimated demand of large"   \
1490           " block sizes to prevent coalescing with an adjoining block")     \
1491                                                                             \
1492   product(double, CMSSmallSplitSurplusPercent, 1.10,                        \
1493           "CMS: the factor by which to inflate estimated demand of small"   \
1494           " block sizes to prevent splitting to supply demand for smaller"  \
1495           " blocks")                                                        \
1496                                                                             \
1497   product(double, CMSLargeSplitSurplusPercent, 1.00,                        \
1498           "CMS: the factor by which to inflate estimated demand of large"   \
1499           " block sizes to prevent splitting to supply demand for smaller"  \
1500           " blocks")                                                        \
1501                                                                             \
1502   product(bool, CMSExtrapolateSweep, false,                                 \
1503           "CMS: cushion for block demand during sweep")                     \
1504                                                                             \
1505   product(uintx, CMS_SweepWeight, 75,                                       \
1506           "Percentage (0-100) used to weight the current sample when "      \
1507           "computing exponentially decaying average for inter-sweep "       \
1508           "duration")                                                       \
1509                                                                             \
1510   product(uintx, CMS_SweepPadding, 1,                                       \
1511           "The multiple of deviation from mean to use for buffering "       \
1512           "against volatility in inter-sweep duration.")                    \
1513                                                                             \
1514   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1515           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1516           "duration exceeds this threhold in milliseconds")                 \
1517                                                                             \
1518   develop(bool, CMSTraceIncrementalMode, false,                             \
1519           "Trace CMS incremental mode")                                     \
1520                                                                             \
1521   develop(bool, CMSTraceIncrementalPacing, false,                           \
1522           "Trace CMS incremental mode pacing computation")                  \
1523                                                                             \
1524   develop(bool, CMSTraceThreadState, false,                                 \
1525           "Trace the CMS thread state (enable the trace_state() method)")   \
1526                                                                             \
1527   product(bool, CMSClassUnloadingEnabled, false,                            \
1528           "Whether class unloading enabled when using CMS GC")              \
1529                                                                             \
1530   product(uintx, CMSClassUnloadingMaxInterval, 0,                           \
1531           "When CMS class unloading is enabled, the maximum CMS cycle count"\
1532           " for which classes may not be unloaded")                         \
1533                                                                             \
1534   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1535           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1536                                                                             \
1537   product(bool, UseCMSCompactAtFullCollection, true,                        \
1538           "Use mark sweep compact at full collections")                     \
1539                                                                             \
1540   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1541           "Number of CMS full collection done before compaction if > 0")    \
1542                                                                             \
1543   develop(intx, CMSDictionaryChoice, 0,                                     \
1544           "Use BinaryTreeDictionary as default in the CMS generation")      \
1545                                                                             \
1546   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1547           "Replenish and indexed free list with this number of chunks")     \
1548                                                                             \
1549   product(bool, CMSReplenishIntermediate, true,                             \
1550           "Replenish all intermediate free-list caches")                    \
1551                                                                             \
1552   product(bool, CMSSplitIndexedFreeListBlocks, true,                        \
1553           "When satisfying batched demand, splot blocks from the "          \
1554           "IndexedFreeList whose size is a multiple of requested size")     \
1555                                                                             \
1556   product(bool, CMSLoopWarn, false,                                         \
1557           "Warn in case of excessive CMS looping")                          \
1558                                                                             \
1559   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1560           "Whether preserved marks should be restored early")               \
1561                                                                             \
1562   product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M),              \
1563           "Size of marking stack")                                          \
1564                                                                             \
1565   product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M),          \
1566           "Max size of marking stack")                                      \
1567                                                                             \
1568   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1569           "Whether we should simulate frequent marking stack / work queue"  \
1570           " overflow")                                                      \
1571                                                                             \
1572   notproduct(uintx, CMSMarkStackOverflowInterval, 1000,                     \
1573           "An `interval' counter that determines how frequently"            \
1574           " we simulate overflow; a smaller number increases frequency")    \
1575                                                                             \
1576   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1577           "(Temporary, subject to experimentation)"                         \
1578           "Maximum number of abortable preclean iterations, if > 0")        \
1579                                                                             \
1580   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1581           "(Temporary, subject to experimentation)"                         \
1582           "Maximum time in abortable preclean in ms")                       \
1583                                                                             \
1584   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1585           "(Temporary, subject to experimentation)"                         \
1586           "Nominal minimum work per abortable preclean iteration")          \
1587                                                                             \
1588   product(intx, CMSAbortablePrecleanWaitMillis, 100,                        \
1589           "(Temporary, subject to experimentation)"                         \
1590           " Time that we sleep between iterations when not given"           \
1591           " enough work per iteration")                                     \
1592                                                                             \
1593   product(uintx, CMSRescanMultiple, 32,                                     \
1594           "Size (in cards) of CMS parallel rescan task")                    \
1595                                                                             \
1596   product(uintx, CMSConcMarkMultiple, 32,                                   \
1597           "Size (in cards) of CMS concurrent MT marking task")              \
1598                                                                             \
1599   product(uintx, CMSRevisitStackSize, 1*M,                                  \
1600           "Size of CMS KlassKlass revisit stack")                           \
1601                                                                             \
1602   product(bool, CMSAbortSemantics, false,                                   \
1603           "Whether abort-on-overflow semantics is implemented")             \
1604                                                                             \
1605   product(bool, CMSParallelRemarkEnabled, true,                             \
1606           "Whether parallel remark enabled (only if ParNewGC)")             \
1607                                                                             \
1608   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1609           "Whether parallel remark of survivor space"                       \
1610           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1611                                                                             \
1612   product(bool, CMSPLABRecordAlways, true,                                  \
1613           "Whether to always record survivor space PLAB bdries"             \
1614           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1615                                                                             \
1616   product(bool, CMSConcurrentMTEnabled, true,                               \
1617           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1618                                                                             \
1619   product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1620           "Whether concurrent precleaning enabled in perm gen"              \
1621           " (effective only when CMSPrecleaningEnabled is true)")           \
1622                                                                             \
1623   product(bool, CMSPrecleaningEnabled, true,                                \
1624           "Whether concurrent precleaning enabled")                         \
1625                                                                             \
1626   product(uintx, CMSPrecleanIter, 3,                                        \
1627           "Maximum number of precleaning iteration passes")                 \
1628                                                                             \
1629   product(uintx, CMSPrecleanNumerator, 2,                                   \
1630           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1631           " ratio")                                                         \
1632                                                                             \
1633   product(uintx, CMSPrecleanDenominator, 3,                                 \
1634           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1635           " ratio")                                                         \
1636                                                                             \
1637   product(bool, CMSPrecleanRefLists1, true,                                 \
1638           "Preclean ref lists during (initial) preclean phase")             \
1639                                                                             \
1640   product(bool, CMSPrecleanRefLists2, false,                                \
1641           "Preclean ref lists during abortable preclean phase")             \
1642                                                                             \
1643   product(bool, CMSPrecleanSurvivors1, false,                               \
1644           "Preclean survivors during (initial) preclean phase")             \
1645                                                                             \
1646   product(bool, CMSPrecleanSurvivors2, true,                                \
1647           "Preclean survivors during abortable preclean phase")             \
1648                                                                             \
1649   product(uintx, CMSPrecleanThreshold, 1000,                                \
1650           "Don't re-iterate if #dirty cards less than this")                \
1651                                                                             \
1652   product(bool, CMSCleanOnEnter, true,                                      \
1653           "Clean-on-enter optimization for reducing number of dirty cards") \
1654                                                                             \
1655   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1656           "Choose variant (1,2) of verification following remark")          \
1657                                                                             \
1658   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1659           "If Eden used is below this value, don't try to schedule remark") \
1660                                                                             \
1661   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1662           "The Eden occupancy % at which to try and schedule remark pause") \
1663                                                                             \
1664   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1665           "Start sampling Eden top at least before yg occupancy reaches"    \
1666           " 1/<ratio> of the size at which we plan to schedule remark")     \
1667                                                                             \
1668   product(uintx, CMSSamplingGrain, 16*K,                                    \
1669           "The minimum distance between eden samples for CMS (see above)")  \
1670                                                                             \
1671   product(bool, CMSScavengeBeforeRemark, false,                             \
1672           "Attempt scavenge before the CMS remark step")                    \
1673                                                                             \
1674   develop(bool, CMSTraceSweeper, false,                                     \
1675           "Trace some actions of the CMS sweeper")                          \
1676                                                                             \
1677   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1678           "Don't drain below this size per parallel worker/thief")          \
1679                                                                             \
1680   product(intx, CMSWaitDuration, 2000,                                      \
1681           "Time in milliseconds that CMS thread waits for young GC")        \
1682                                                                             \
1683   product(bool, CMSYield, true,                                             \
1684           "Yield between steps of concurrent mark & sweep")                 \
1685                                                                             \
1686   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1687           "Bitmap operations should process at most this many bits"         \
1688           "between yields")                                                 \
1689                                                                             \
1690   product(bool, CMSDumpAtPromotionFailure, false,                           \
1691           "Dump useful information about the state of the CMS old "         \
1692           " generation upon a promotion failure.")                          \
1693                                                                             \
1694   product(bool, CMSPrintChunksInDump, false,                                \
1695           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1696           " more detailed information about the free chunks.")              \
1697                                                                             \
1698   product(bool, CMSPrintObjectsInDump, false,                               \
1699           "In a dump enabled by CMSDumpAtPromotionFailure, include "        \
1700           " more detailed information about the allocated objects.")        \
1701                                                                             \
1702   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1703           "Verify that all refs across the FLS boundary "                   \
1704           " are to valid objects")                                          \
1705                                                                             \
1706   diagnostic(bool, FLSVerifyLists, false,                                   \
1707           "Do lots of (expensive) FreeListSpace verification")              \
1708                                                                             \
1709   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1710           "Do lots of (expensive) FLS index table verification")            \
1711                                                                             \
1712   develop(bool, FLSVerifyDictionary, false,                                 \
1713           "Do lots of (expensive) FLS dictionary verification")             \
1714                                                                             \
1715   develop(bool, VerifyBlockOffsetArray, false,                              \
1716           "Do (expensive!) block offset array verification")                \
1717                                                                             \
1718   product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug,           \
1719           "Maintain _unallocated_block in BlockOffsetArray"                 \
1720           " (currently applicable only to CMS collector)")                  \
1721                                                                             \
1722   develop(bool, TraceCMSState, false,                                       \
1723           "Trace the state of the CMS collection")                          \
1724                                                                             \
1725   product(intx, RefDiscoveryPolicy, 0,                                      \
1726           "Whether reference-based(0) or referent-based(1)")                \
1727                                                                             \
1728   product(bool, ParallelRefProcEnabled, false,                              \
1729           "Enable parallel reference processing whenever possible")         \
1730                                                                             \
1731   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1732           "Enable balancing of reference processing queues")                \
1733                                                                             \
1734   product(intx, CMSTriggerRatio, 80,                                        \
1735           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1736           "allocated before a CMS collection cycle commences")              \
1737                                                                             \
1738   product(intx, CMSTriggerPermRatio, 80,                                    \
1739           "Percentage of MinHeapFreeRatio in the CMS perm generation that " \
1740           "is allocated before a CMS collection cycle commences, that "     \
1741           "also collects the perm generation")                              \
1742                                                                             \
1743   product(uintx, CMSBootstrapOccupancy, 50,                                 \
1744           "Percentage CMS generation occupancy at which to "                \
1745           "initiate CMS collection for bootstrapping collection stats")     \
1746                                                                             \
1747   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1748           "Percentage CMS generation occupancy to start a CMS collection "  \
1749           "cycle. A negative value means that CMSTriggerRatio is used")     \
1750                                                                             \
1751   product(uintx, InitiatingHeapOccupancyPercent, 45,                        \
1752           "Percentage of the (entire) heap occupancy to start a "           \
1753           "concurrent GC cycle. It us used by GCs that trigger a "          \
1754           "concurrent GC cycle based on the occupancy of the entire heap, " \
1755           "not just one of the generations (e.g., G1). A value of 0 "       \
1756           "denotes 'do constant GC cycles'.")                               \
1757                                                                             \
1758   product(intx, CMSInitiatingPermOccupancyFraction, -1,                     \
1759           "Percentage CMS perm generation occupancy to start a "            \
1760           "CMScollection cycle. A negative value means that "               \
1761           "CMSTriggerPermRatio is used")                                    \
1762                                                                             \
1763   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1764           "Only use occupancy as a crierion for starting a CMS collection") \
1765                                                                             \
1766   product(intx, CMSIsTooFullPercentage, 98,                                 \
1767           "An absolute ceiling above which CMS will always consider the "   \
1768           "perm gen ripe for collection")                                   \
1769                                                                             \
1770   develop(bool, CMSTestInFreeList, false,                                   \
1771           "Check if the coalesced range is already in the "                 \
1772           "free lists as claimed")                                          \
1773                                                                             \
1774   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1775           "Check that all the garbage collected was returned to the "       \
1776           "free lists.")                                                    \
1777                                                                             \
1778   notproduct(bool, ScavengeALot, false,                                     \
1779           "Force scavenge at every Nth exit from the runtime system "       \
1780           "(N=ScavengeALotInterval)")                                       \
1781                                                                             \
1782   develop(bool, FullGCALot, false,                                          \
1783           "Force full gc at every Nth exit from the runtime system "        \
1784           "(N=FullGCALotInterval)")                                         \
1785                                                                             \
1786   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1787           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1788                                                                             \
1789   product(bool, HandlePromotionFailure, true,                               \
1790           "The youngest generation collection does not require "            \
1791           "a guarantee of full promotion of all live objects.")             \
1792                                                                             \
1793   product(bool, PrintPromotionFailure, false,                               \
1794           "Print additional diagnostic information following "              \
1795           " promotion failure")                                             \
1796                                                                             \
1797   notproduct(bool, PromotionFailureALot, false,                             \
1798           "Use promotion failure handling on every youngest generation "    \
1799           "collection")                                                     \
1800                                                                             \
1801   develop(uintx, PromotionFailureALotCount, 1000,                           \
1802           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1803           "refill attempts (ParNew) or promotion attempts "                 \
1804           "(other young collectors) ")                                      \
1805                                                                             \
1806   develop(uintx, PromotionFailureALotInterval, 5,                           \
1807           "Total collections between promotion failures alot")              \
1808                                                                             \
1809   develop(intx, WorkStealingSleepMillis, 1,                                 \
1810           "Sleep time when sleep is used for yields")                       \
1811                                                                             \
1812   develop(uintx, WorkStealingYieldsBeforeSleep, 1000,                       \
1813           "Number of yields before a sleep is done during workstealing")    \
1814                                                                             \
1815   develop(uintx, WorkStealingHardSpins, 4096,                               \
1816           "Number of iterations in a spin loop between checks on "          \
1817           "time out of hard spin")                                          \
1818                                                                             \
1819   develop(uintx, WorkStealingSpinToYieldRatio, 10,                          \
1820           "Ratio of hard spins to calls to yield")                          \
1821                                                                             \
1822   product(uintx, PreserveMarkStackSize, 1024,                               \
1823           "Size for stack used in promotion failure handling")              \
1824                                                                             \
1825   develop(uintx, ObjArrayMarkingStride, 512,                                \
1826           "Number of ObjArray elements to push onto the marking stack"      \
1827           "before pushing a continuation entry")                            \
1828                                                                             \
1829   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1830                                                                             \
1831   product_pd(bool, ResizeTLAB,                                              \
1832           "Dynamically resize tlab size for threads")                       \
1833                                                                             \
1834   product(bool, ZeroTLAB, false,                                            \
1835           "Zero out the newly created TLAB")                                \
1836                                                                             \
1837   product(bool, FastTLABRefill, true,                                       \
1838           "Use fast TLAB refill code")                                      \
1839                                                                             \
1840   product(bool, PrintTLAB, false,                                           \
1841           "Print various TLAB related information")                         \
1842                                                                             \
1843   product(bool, TLABStats, true,                                            \
1844           "Print various TLAB related information")                         \
1845                                                                             \
1846   product(bool, PrintRevisitStats, false,                                   \
1847           "Print revisit (klass and MDO) stack related information")        \
1848                                                                             \
1849   product_pd(bool, NeverActAsServerClassMachine,                            \
1850           "Never act like a server-class machine")                          \
1851                                                                             \
1852   product(bool, AlwaysActAsServerClassMachine, false,                       \
1853           "Always act like a server-class machine")                         \
1854                                                                             \
1855   product_pd(uint64_t, MaxRAM,                                              \
1856           "Real memory size (in bytes) used to set maximum heap size")      \
1857                                                                             \
1858   product(uintx, ErgoHeapSizeLimit, 0,                                      \
1859           "Maximum ergonomically set heap size (in bytes); zero means use " \
1860           "MaxRAM / MaxRAMFraction")                                        \
1861                                                                             \
1862   product(uintx, MaxRAMFraction, 4,                                         \
1863           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1864           "size")                                                           \
1865                                                                             \
1866   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1867           "Maximum fraction (1/n) of real memory used for maximum heap "    \
1868           "size; deprecated: to be renamed to MaxRAMFraction")              \
1869                                                                             \
1870   product(uintx, MinRAMFraction, 2,                                         \
1871           "Minimum fraction (1/n) of real memory used for maxmimum heap "   \
1872           "size on systems with small physical memory size")                \
1873                                                                             \
1874   product(uintx, InitialRAMFraction, 64,                                    \
1875           "Fraction (1/n) of real memory used for initial heap size")       \
1876                                                                             \
1877   product(bool, UseAutoGCSelectPolicy, false,                               \
1878           "Use automatic collection selection policy")                      \
1879                                                                             \
1880   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1881           "Automatic GC selection pause threshhold in ms")                  \
1882                                                                             \
1883   product(bool, UseAdaptiveSizePolicy, true,                                \
1884           "Use adaptive generation sizing policies")                        \
1885                                                                             \
1886   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1887           "Use adaptive survivor sizing policies")                          \
1888                                                                             \
1889   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1890           "Use adaptive young-old sizing policies at minor collections")    \
1891                                                                             \
1892   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1893           "Use adaptive young-old sizing policies at major collections")    \
1894                                                                             \
1895   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1896           "Use statistics from System.GC for adaptive size policy")         \
1897                                                                             \
1898   product(bool, UseAdaptiveGCBoundary, false,                               \
1899           "Allow young-old boundary to move")                               \
1900                                                                             \
1901   develop(bool, TraceAdaptiveGCBoundary, false,                             \
1902           "Trace young-old boundary moves")                                 \
1903                                                                             \
1904   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
1905           "Resize the virtual spaces of the young or old generations")      \
1906                                                                             \
1907   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
1908           "Policy for changeing generation size for throughput goals")      \
1909                                                                             \
1910   product(uintx, AdaptiveSizePausePolicy, 0,                                \
1911           "Policy for changing generation size for pause goals")            \
1912                                                                             \
1913   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
1914           "Adjust tenured generation to achive a minor pause goal")         \
1915                                                                             \
1916   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
1917           "Adjust young generation to achive a major pause goal")           \
1918                                                                             \
1919   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
1920           "Number of steps where heuristics is used before data is used")   \
1921                                                                             \
1922   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
1923           "Number of collections before the adaptive sizing is started")    \
1924                                                                             \
1925   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
1926           "Collecton interval for printing information; zero => never")     \
1927                                                                             \
1928   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
1929           "Use adaptive minimum footprint as a goal")                       \
1930                                                                             \
1931   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
1932           "Weight given to exponential resizing, between 0 and 100")        \
1933                                                                             \
1934   product(uintx, AdaptiveTimeWeight,       25,                              \
1935           "Weight given to time in adaptive policy, between 0 and 100")     \
1936                                                                             \
1937   product(uintx, PausePadding, 1,                                           \
1938           "How much buffer to keep for pause time")                         \
1939                                                                             \
1940   product(uintx, PromotedPadding, 3,                                        \
1941           "How much buffer to keep for promotion failure")                  \
1942                                                                             \
1943   product(uintx, SurvivorPadding, 3,                                        \
1944           "How much buffer to keep for survivor overflow")                  \
1945                                                                             \
1946   product(uintx, AdaptivePermSizeWeight, 20,                                \
1947           "Weight for perm gen exponential resizing, between 0 and 100")    \
1948                                                                             \
1949   product(uintx, PermGenPadding, 3,                                         \
1950           "How much buffer to keep for perm gen sizing")                    \
1951                                                                             \
1952   product(uintx, ThresholdTolerance, 10,                                    \
1953           "Allowed collection cost difference between generations")         \
1954                                                                             \
1955   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
1956           "If collection costs are within margin, reduce both by full "     \
1957           "delta")                                                          \
1958                                                                             \
1959   product(uintx, YoungGenerationSizeIncrement, 20,                          \
1960           "Adaptive size percentage change in young generation")            \
1961                                                                             \
1962   product(uintx, YoungGenerationSizeSupplement, 80,                         \
1963           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
1964                                                                             \
1965   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
1966           "Decay factor to YoungedGenerationSizeSupplement")                \
1967                                                                             \
1968   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
1969           "Adaptive size percentage change in tenured generation")          \
1970                                                                             \
1971   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
1972           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
1973                                                                             \
1974   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
1975           "Decay factor to TenuredGenerationSizeIncrement")                 \
1976                                                                             \
1977   product(uintx, MaxGCPauseMillis, max_uintx,                               \
1978           "Adaptive size policy maximum GC pause time goal in msec, "       \
1979           "or (G1 Only) the max. GC time per MMU time slice")               \
1980                                                                             \
1981   product(uintx, GCPauseIntervalMillis, 0,                                  \
1982           "Time slice for MMU specification")                               \
1983                                                                             \
1984   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
1985           "Adaptive size policy maximum GC minor pause time goal in msec")  \
1986                                                                             \
1987   product(uintx, GCTimeRatio, 99,                                           \
1988           "Adaptive size policy application time to GC time ratio")         \
1989                                                                             \
1990   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
1991           "Adaptive size scale down factor for shrinking")                  \
1992                                                                             \
1993   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
1994           "Adaptive size decays the major cost for long major intervals")   \
1995                                                                             \
1996   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
1997           "Time scale over which major costs decay")                        \
1998                                                                             \
1999   product(uintx, MinSurvivorRatio, 3,                                       \
2000           "Minimum ratio of young generation/survivor space size")          \
2001                                                                             \
2002   product(uintx, InitialSurvivorRatio, 8,                                   \
2003           "Initial ratio of eden/survivor space size")                      \
2004                                                                             \
2005   product(uintx, BaseFootPrintEstimate, 256*M,                              \
2006           "Estimate of footprint other than Java Heap")                     \
2007                                                                             \
2008   product(bool, UseGCOverheadLimit, true,                                   \
2009           "Use policy to limit of proportion of time spent in GC "          \
2010           "before an OutOfMemory error is thrown")                          \
2011                                                                             \
2012   product(uintx, GCTimeLimit, 98,                                           \
2013           "Limit of proportion of time spent in GC before an OutOfMemory"   \
2014           "error is thrown (used with GCHeapFreeLimit)")                    \
2015                                                                             \
2016   product(uintx, GCHeapFreeLimit, 2,                                        \
2017           "Minimum percentage of free space after a full GC before an "     \
2018           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
2019                                                                             \
2020   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
2021           "Number of consecutive collections before gc time limit fires")   \
2022                                                                             \
2023   product(bool, PrintAdaptiveSizePolicy, false,                             \
2024           "Print information about AdaptiveSizePolicy")                     \
2025                                                                             \
2026   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
2027           "How far ahead to prefetch destination area (<= 0 means off)")    \
2028                                                                             \
2029   product(intx, PrefetchScanIntervalInBytes, -1,                            \
2030           "How far ahead to prefetch scan area (<= 0 means off)")           \
2031                                                                             \
2032   product(intx, PrefetchFieldsAhead, -1,                                    \
2033           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
2034                                                                             \
2035   develop(bool, UsePrefetchQueue, true,                                     \
2036           "Use the prefetch queue during PS promotion")                     \
2037                                                                             \
2038   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
2039           "Verify system before exiting")                                   \
2040                                                                             \
2041   diagnostic(bool, VerifyBeforeGC, false,                                   \
2042           "Verify memory system before GC")                                 \
2043                                                                             \
2044   diagnostic(bool, VerifyAfterGC, false,                                    \
2045           "Verify memory system after GC")                                  \
2046                                                                             \
2047   diagnostic(bool, VerifyDuringGC, false,                                   \
2048           "Verify memory system during GC (between phases)")                \
2049                                                                             \
2050   diagnostic(bool, GCParallelVerificationEnabled, true,                     \
2051           "Enable parallel memory system verification")                     \
2052                                                                             \
2053   diagnostic(bool, DeferInitialCardMark, false,                             \
2054           "When +ReduceInitialCardMarks, explicitly defer any that "        \
2055            "may arise from new_pre_store_barrier")                          \
2056                                                                             \
2057   diagnostic(bool, VerifyRememberedSets, false,                             \
2058           "Verify GC remembered sets")                                      \
2059                                                                             \
2060   diagnostic(bool, VerifyObjectStartArray, true,                            \
2061           "Verify GC object start array if verify before/after")            \
2062                                                                             \
2063   product(bool, DisableExplicitGC, false,                                   \
2064           "Tells whether calling System.gc() does a full GC")               \
2065                                                                             \
2066   notproduct(bool, CheckMemoryInitialization, false,                        \
2067           "Checks memory initialization")                                   \
2068                                                                             \
2069   product(bool, CollectGen0First, false,                                    \
2070           "Collect youngest generation before each full GC")                \
2071                                                                             \
2072   diagnostic(bool, BindCMSThreadToCPU, false,                               \
2073           "Bind CMS Thread to CPU if possible")                             \
2074                                                                             \
2075   diagnostic(uintx, CPUForCMSThread, 0,                                     \
2076           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
2077                                                                             \
2078   product(bool, BindGCTaskThreadsToCPUs, false,                             \
2079           "Bind GCTaskThreads to CPUs if possible")                         \
2080                                                                             \
2081   product(bool, UseGCTaskAffinity, false,                                   \
2082           "Use worker affinity when asking for GCTasks")                    \
2083                                                                             \
2084   product(uintx, ProcessDistributionStride, 4,                              \
2085           "Stride through processors when distributing processes")          \
2086                                                                             \
2087   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
2088           "number of times the coordinator GC thread will sleep while "     \
2089           "yielding before giving up and resuming GC")                      \
2090                                                                             \
2091   product(uintx, CMSYieldSleepCount, 0,                                     \
2092           "number of times a GC thread (minus the coordinator) "            \
2093           "will sleep while yielding before giving up and resuming GC")     \
2094                                                                             \
2095   /* gc tracing */                                                          \
2096   manageable(bool, PrintGC, false,                                          \
2097           "Print message at garbage collect")                               \
2098                                                                             \
2099   manageable(bool, PrintGCDetails, false,                                   \
2100           "Print more details at garbage collect")                          \
2101                                                                             \
2102   manageable(bool, PrintGCDateStamps, false,                                \
2103           "Print date stamps at garbage collect")                           \
2104                                                                             \
2105   manageable(bool, PrintGCTimeStamps, false,                                \
2106           "Print timestamps at garbage collect")                            \
2107                                                                             \
2108   product(bool, PrintGCTaskTimeStamps, false,                               \
2109           "Print timestamps for individual gc worker thread tasks")         \
2110                                                                             \
2111   develop(intx, ConcGCYieldTimeout, 0,                                      \
2112           "If non-zero, assert that GC threads yield within this # of ms.") \
2113                                                                             \
2114   notproduct(bool, TraceMarkSweep, false,                                   \
2115           "Trace mark sweep")                                               \
2116                                                                             \
2117   product(bool, PrintReferenceGC, false,                                    \
2118           "Print times spent handling reference objects during GC "         \
2119           " (enabled only when PrintGCDetails)")                            \
2120                                                                             \
2121   develop(bool, TraceReferenceGC, false,                                    \
2122           "Trace handling of soft/weak/final/phantom references")           \
2123                                                                             \
2124   develop(bool, TraceFinalizerRegistration, false,                          \
2125          "Trace registration of final references")                          \
2126                                                                             \
2127   notproduct(bool, TraceScavenge, false,                                    \
2128           "Trace scavenge")                                                 \
2129                                                                             \
2130   product_rw(bool, TraceClassLoading, false,                                \
2131           "Trace all classes loaded")                                       \
2132                                                                             \
2133   product(bool, TraceClassLoadingPreorder, false,                           \
2134           "Trace all classes loaded in order referenced (not loaded)")      \
2135                                                                             \
2136   product_rw(bool, TraceClassUnloading, false,                              \
2137           "Trace unloading of classes")                                     \
2138                                                                             \
2139   product_rw(bool, TraceLoaderConstraints, false,                           \
2140           "Trace loader constraints")                                       \
2141                                                                             \
2142   product(bool, TraceGen0Time, false,                                       \
2143           "Trace accumulated time for Gen 0 collection")                    \
2144                                                                             \
2145   product(bool, TraceGen1Time, false,                                       \
2146           "Trace accumulated time for Gen 1 collection")                    \
2147                                                                             \
2148   product(bool, PrintTenuringDistribution, false,                           \
2149           "Print tenuring age information")                                 \
2150                                                                             \
2151   product_rw(bool, PrintHeapAtGC, false,                                    \
2152           "Print heap layout before and after each GC")                     \
2153                                                                             \
2154   product_rw(bool, PrintHeapAtGCExtended, false,                            \
2155           "Prints extended information about the layout of the heap "       \
2156           "when -XX:+PrintHeapAtGC is set")                                 \
2157                                                                             \
2158   product(bool, PrintHeapAtSIGBREAK, true,                                  \
2159           "Print heap layout in response to SIGBREAK")                      \
2160                                                                             \
2161   manageable(bool, PrintClassHistogramBeforeFullGC, false,                  \
2162           "Print a class histogram before any major stop-world GC")         \
2163                                                                             \
2164   manageable(bool, PrintClassHistogramAfterFullGC, false,                   \
2165           "Print a class histogram after any major stop-world GC")          \
2166                                                                             \
2167   manageable(bool, PrintClassHistogram, false,                              \
2168           "Print a histogram of class instances")                           \
2169                                                                             \
2170   develop(bool, TraceWorkGang, false,                                       \
2171           "Trace activities of work gangs")                                 \
2172                                                                             \
2173   product(bool, TraceParallelOldGCTasks, false,                             \
2174           "Trace multithreaded GC activity")                                \
2175                                                                             \
2176   develop(bool, TraceBlockOffsetTable, false,                               \
2177           "Print BlockOffsetTable maps")                                    \
2178                                                                             \
2179   develop(bool, TraceCardTableModRefBS, false,                              \
2180           "Print CardTableModRefBS maps")                                   \
2181                                                                             \
2182   develop(bool, TraceGCTaskManager, false,                                  \
2183           "Trace actions of the GC task manager")                           \
2184                                                                             \
2185   develop(bool, TraceGCTaskQueue, false,                                    \
2186           "Trace actions of the GC task queues")                            \
2187                                                                             \
2188   develop(bool, TraceGCTaskThread, false,                                   \
2189           "Trace actions of the GC task threads")                           \
2190                                                                             \
2191   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
2192           "Print the time taken by each parallel old gc phase."             \
2193           "PrintGCDetails must also be enabled.")                           \
2194                                                                             \
2195   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
2196           "Trace parallel old gc marking phase")                            \
2197                                                                             \
2198   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
2199           "Trace parallel old gc summary phase")                            \
2200                                                                             \
2201   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
2202           "Trace parallel old gc compaction phase")                         \
2203                                                                             \
2204   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
2205           "Trace parallel old gc dense prefix computation")                 \
2206                                                                             \
2207   develop(bool, IgnoreLibthreadGPFault, false,                              \
2208           "Suppress workaround for libthread GP fault")                     \
2209                                                                             \
2210   product(bool, PrintJNIGCStalls, false,                                    \
2211           "Print diagnostic message when GC is stalled"                     \
2212           "by JNI critical section")                                        \
2213                                                                             \
2214   /* JVMTI heap profiling */                                                \
2215                                                                             \
2216   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
2217           "Trace JVMTI object tagging calls")                               \
2218                                                                             \
2219   diagnostic(bool, VerifyBeforeIteration, false,                            \
2220           "Verify memory system before JVMTI iteration")                    \
2221                                                                             \
2222   /* compiler interface */                                                  \
2223                                                                             \
2224   develop(bool, CIPrintCompilerName, false,                                 \
2225           "when CIPrint is active, print the name of the active compiler")  \
2226                                                                             \
2227   develop(bool, CIPrintCompileQueue, false,                                 \
2228           "display the contents of the compile queue whenever a "           \
2229           "compilation is enqueued")                                        \
2230                                                                             \
2231   develop(bool, CIPrintRequests, false,                                     \
2232           "display every request for compilation")                          \
2233                                                                             \
2234   product(bool, CITime, false,                                              \
2235           "collect timing information for compilation")                     \
2236                                                                             \
2237   develop(bool, CITimeEach, false,                                          \
2238           "display timing information after each successful compilation")   \
2239                                                                             \
2240   develop(bool, CICountOSR, true,                                           \
2241           "use a separate counter when assigning ids to osr compilations")  \
2242                                                                             \
2243   develop(bool, CICompileNatives, true,                                     \
2244           "compile native methods if supported by the compiler")            \
2245                                                                             \
2246   develop_pd(bool, CICompileOSR,                                            \
2247           "compile on stack replacement methods if supported by the "       \
2248           "compiler")                                                       \
2249                                                                             \
2250   develop(bool, CIPrintMethodCodes, false,                                  \
2251           "print method bytecodes of the compiled code")                    \
2252                                                                             \
2253   develop(bool, CIPrintTypeFlow, false,                                     \
2254           "print the results of ciTypeFlow analysis")                       \
2255                                                                             \
2256   develop(bool, CITraceTypeFlow, false,                                     \
2257           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
2258                                                                             \
2259   develop(intx, CICloneLoopTestLimit, 100,                                  \
2260           "size limit for blocks heuristically cloned in ciTypeFlow")       \
2261                                                                             \
2262   /* temp diagnostics */                                                    \
2263                                                                             \
2264   diagnostic(bool, TraceRedundantCompiles, false,                           \
2265           "Have compile broker print when a request already in the queue is"\
2266           " requested again")                                               \
2267                                                                             \
2268   diagnostic(bool, InitialCompileFast, false,                               \
2269           "Initial compile at CompLevel_fast_compile")                      \
2270                                                                             \
2271   diagnostic(bool, InitialCompileReallyFast, false,                         \
2272           "Initial compile at CompLevel_really_fast_compile (no profile)")  \
2273                                                                             \
2274   diagnostic(bool, FullProfileOnReInterpret, true,                          \
2275           "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
2276                                                                             \
2277   /* compiler */                                                            \
2278                                                                             \
2279   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
2280           "Number of compiler threads to run")                              \
2281                                                                             \
2282   product(intx, CompilationPolicyChoice, 0,                                 \
2283           "which compilation policy (0/1)")                                 \
2284                                                                             \
2285   develop(bool, UseStackBanging, true,                                      \
2286           "use stack banging for stack overflow checks (required for "      \
2287           "proper StackOverflow handling; disable only to measure cost "    \
2288           "of stackbanging)")                                               \
2289                                                                             \
2290   develop(bool, Use24BitFPMode, true,                                       \
2291           "Set 24-bit FPU mode on a per-compile basis ")                    \
2292                                                                             \
2293   develop(bool, Use24BitFP, true,                                           \
2294           "use FP instructions that produce 24-bit precise results")        \
2295                                                                             \
2296   develop(bool, UseStrictFP, true,                                          \
2297           "use strict fp if modifier strictfp is set")                      \
2298                                                                             \
2299   develop(bool, GenerateSynchronizationCode, true,                          \
2300           "generate locking/unlocking code for synchronized methods and "   \
2301           "monitors")                                                       \
2302                                                                             \
2303   develop(bool, GenerateCompilerNullChecks, true,                           \
2304           "Generate explicit null checks for loads/stores/calls")           \
2305                                                                             \
2306   develop(bool, GenerateRangeChecks, true,                                  \
2307           "Generate range checks for array accesses")                       \
2308                                                                             \
2309   develop_pd(bool, ImplicitNullChecks,                                      \
2310           "generate code for implicit null checks")                         \
2311                                                                             \
2312   product(bool, PrintSafepointStatistics, false,                            \
2313           "print statistics about safepoint synchronization")               \
2314                                                                             \
2315   product(intx, PrintSafepointStatisticsCount, 300,                         \
2316           "total number of safepoint statistics collected "                 \
2317           "before printing them out")                                       \
2318                                                                             \
2319   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2320           "print safepoint statistics only when safepoint takes"            \
2321           " more than PrintSafepointSatisticsTimeout in millis")            \
2322                                                                             \
2323   product(bool, TraceSafepointCleanupTime, false,                           \
2324           "print the break down of clean up tasks performed during"         \
2325           " safepoint")                                                     \
2326                                                                             \
2327   develop(bool, InlineAccessors, true,                                      \
2328           "inline accessor methods (get/set)")                              \
2329                                                                             \
2330   product(bool, Inline, true,                                               \
2331           "enable inlining")                                                \
2332                                                                             \
2333   product(bool, ClipInlining, true,                                         \
2334           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2335                                                                             \
2336   develop(bool, UseCHA, true,                                               \
2337           "enable CHA")                                                     \
2338                                                                             \
2339   product(bool, UseTypeProfile, true,                                       \
2340           "Check interpreter profile for historically monomorphic calls")   \
2341                                                                             \
2342   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
2343           "% of major receiver type to all profiled receivers")             \
2344                                                                             \
2345   notproduct(bool, TimeCompiler, false,                                     \
2346           "time the compiler")                                              \
2347                                                                             \
2348   notproduct(bool, TimeCompiler2, false,                                    \
2349           "detailed time the compiler (requires +TimeCompiler)")            \
2350                                                                             \
2351   diagnostic(bool, PrintInlining, false,                                    \
2352           "prints inlining optimizations")                                  \
2353                                                                             \
2354   diagnostic(bool, PrintIntrinsics, false,                                  \
2355           "prints attempted and successful inlining of intrinsics")         \
2356                                                                             \
2357   product(bool, UseCountLeadingZerosInstruction, false,                     \
2358           "Use count leading zeros instruction")                            \
2359                                                                             \
2360   product(bool, UsePopCountInstruction, false,                              \
2361           "Use population count instruction")                               \
2362                                                                             \
2363   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
2364           "do not expand intrinsics whose (internal) names appear here")    \
2365                                                                             \
2366   develop(bool, StressReflectiveCode, false,                                \
2367           "Use inexact types at allocations, etc., to test reflection")     \
2368                                                                             \
2369   develop(bool, EagerInitialization, false,                                 \
2370           "Eagerly initialize classes if possible")                         \
2371                                                                             \
2372   product(bool, Tier1UpdateMethodData, trueInTiered,                        \
2373           "Update methodDataOops in Tier1-generated code")                  \
2374                                                                             \
2375   develop(bool, TraceMethodReplacement, false,                              \
2376           "Print when methods are replaced do to recompilation")            \
2377                                                                             \
2378   develop(bool, PrintMethodFlushing, false,                                 \
2379           "print the nmethods being flushed")                               \
2380                                                                             \
2381   notproduct(bool, LogMultipleMutexLocking, false,                          \
2382           "log locking and unlocking of mutexes (only if multiple locks "   \
2383           "are held)")                                                      \
2384                                                                             \
2385   develop(bool, UseRelocIndex, false,                                       \
2386          "use an index to speed random access to relocations")              \
2387                                                                             \
2388   develop(bool, StressCodeBuffers, false,                                   \
2389          "Exercise code buffer expansion and other rare state changes")     \
2390                                                                             \
2391   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2392          "Generate extra debugging info for non-safepoints in nmethods")    \
2393                                                                             \
2394   diagnostic(bool, DebugInlinedCalls, true,                                 \
2395          "If false, restricts profiled locations to the root method only")  \
2396                                                                             \
2397   product(bool, PrintVMOptions, trueInDebug,                                \
2398          "Print flags that appeared on the command line")                   \
2399                                                                             \
2400   product(bool, IgnoreUnrecognizedVMOptions, false,                         \
2401          "Ignore unrecognized VM options")                                  \
2402                                                                             \
2403   product(bool, PrintCommandLineFlags, false,                               \
2404          "Print flags specified on command line or set by ergonomics")      \
2405                                                                             \
2406   product(bool, PrintFlagsInitial, false,                                   \
2407          "Print all VM flags before argument processing and exit VM")       \
2408                                                                             \
2409   product(bool, PrintFlagsFinal, false,                                     \
2410          "Print all VM flags after argument and ergonomic processing")      \
2411                                                                             \
2412   notproduct(bool, PrintFlagsWithComments, false,                           \
2413          "Print all VM flags with default values and descriptions and exit")\
2414                                                                             \
2415   diagnostic(bool, SerializeVMOutput, true,                                 \
2416          "Use a mutex to serialize output to tty and hotspot.log")          \
2417                                                                             \
2418   diagnostic(bool, DisplayVMOutput, true,                                   \
2419          "Display all VM output on the tty, independently of LogVMOutput")  \
2420                                                                             \
2421   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2422          "Save VM output to hotspot.log, or to LogFile")                    \
2423                                                                             \
2424   diagnostic(ccstr, LogFile, NULL,                                          \
2425          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2426                                                                             \
2427   product(ccstr, ErrorFile, NULL,                                           \
2428          "If an error occurs, save the error data to this file "            \
2429          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2430                                                                             \
2431   product(bool, DisplayVMOutputToStderr, false,                             \
2432          "If DisplayVMOutput is true, display all VM output to stderr")     \
2433                                                                             \
2434   product(bool, DisplayVMOutputToStdout, false,                             \
2435          "If DisplayVMOutput is true, display all VM output to stdout")     \
2436                                                                             \
2437   product(bool, UseHeavyMonitors, false,                                    \
2438           "use heavyweight instead of lightweight Java monitors")           \
2439                                                                             \
2440   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2441           "print histogram of the symbol table")                            \
2442                                                                             \
2443   notproduct(bool, ExitVMOnVerifyError, false,                              \
2444           "standard exit from VM if bytecode verify error "                 \
2445           "(only in debug mode)")                                           \
2446                                                                             \
2447   notproduct(ccstr, AbortVMOnException, NULL,                               \
2448           "Call fatal if this exception is thrown.  Example: "              \
2449           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2450                                                                             \
2451   notproduct(ccstr, AbortVMOnExceptionMessage, NULL,                        \
2452           "Call fatal if the exception pointed by AbortVMOnException "      \
2453           "has this message.")                                              \
2454                                                                             \
2455   develop(bool, DebugVtables, false,                                        \
2456           "add debugging code to vtable dispatch")                          \
2457                                                                             \
2458   develop(bool, PrintVtables, false,                                        \
2459           "print vtables when printing klass")                              \
2460                                                                             \
2461   notproduct(bool, PrintVtableStats, false,                                 \
2462           "print vtables stats at end of run")                              \
2463                                                                             \
2464   develop(bool, TraceCreateZombies, false,                                  \
2465           "trace creation of zombie nmethods")                              \
2466                                                                             \
2467   notproduct(bool, IgnoreLockingAssertions, false,                          \
2468           "disable locking assertions (for speed)")                         \
2469                                                                             \
2470   notproduct(bool, VerifyLoopOptimizations, false,                          \
2471           "verify major loop optimizations")                                \
2472                                                                             \
2473   product(bool, RangeCheckElimination, true,                                \
2474           "Split loop iterations to eliminate range checks")                \
2475                                                                             \
2476   develop_pd(bool, UncommonNullCast,                                        \
2477           "track occurrences of null in casts; adjust compiler tactics")    \
2478                                                                             \
2479   develop(bool, TypeProfileCasts,  true,                                    \
2480           "treat casts like calls for purposes of type profiling")          \
2481                                                                             \
2482   develop(bool, MonomorphicArrayCheck, true,                                \
2483           "Uncommon-trap array store checks that require full type check")  \
2484                                                                             \
2485   develop(bool, DelayCompilationDuringStartup, true,                        \
2486           "Delay invoking the compiler until main application class is "    \
2487           "loaded")                                                         \
2488                                                                             \
2489   develop(bool, CompileTheWorld, false,                                     \
2490           "Compile all methods in all classes in bootstrap class path "     \
2491           "(stress test)")                                                  \
2492                                                                             \
2493   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2494           "Preload all classes used by a class before start loading")       \
2495                                                                             \
2496   notproduct(bool, CompileTheWorldIgnoreInitErrors, false,                  \
2497           "Compile all methods although class initializer failed")          \
2498                                                                             \
2499   notproduct(intx, CompileTheWorldSafepointInterval, 100,                   \
2500           "Force a safepoint every n compiles so sweeper can keep up")      \
2501                                                                             \
2502   develop(bool, TraceIterativeGVN, false,                                   \
2503           "Print progress during Iterative Global Value Numbering")         \
2504                                                                             \
2505   develop(bool, FillDelaySlots, true,                                       \
2506           "Fill delay slots (on SPARC only)")                               \
2507                                                                             \
2508   develop(bool, VerifyIterativeGVN, false,                                  \
2509           "Verify Def-Use modifications during sparse Iterative Global "    \
2510           "Value Numbering")                                                \
2511                                                                             \
2512   notproduct(bool, TracePhaseCCP, false,                                    \
2513           "Print progress during Conditional Constant Propagation")         \
2514                                                                             \
2515   develop(bool, TimeLivenessAnalysis, false,                                \
2516           "Time computation of bytecode liveness analysis")                 \
2517                                                                             \
2518   develop(bool, TraceLivenessGen, false,                                    \
2519           "Trace the generation of liveness analysis information")          \
2520                                                                             \
2521   notproduct(bool, TraceLivenessQuery, false,                               \
2522           "Trace queries of liveness analysis information")                 \
2523                                                                             \
2524   notproduct(bool, CollectIndexSetStatistics, false,                        \
2525           "Collect information about IndexSets")                            \
2526                                                                             \
2527   develop(bool, PrintDominators, false,                                     \
2528           "Print out dominator trees for GVN")                              \
2529                                                                             \
2530   develop(bool, UseLoopSafepoints, true,                                    \
2531           "Generate Safepoint nodes in every loop")                         \
2532                                                                             \
2533   notproduct(bool, TraceCISCSpill, false,                                   \
2534           "Trace allocators use of cisc spillable instructions")            \
2535                                                                             \
2536   notproduct(bool, TraceSpilling, false,                                    \
2537           "Trace spilling")                                                 \
2538                                                                             \
2539   product(bool, SplitIfBlocks, true,                                        \
2540           "Clone compares and control flow through merge points to fold "   \
2541           "some branches")                                                  \
2542                                                                             \
2543   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2544           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2545           "Inline allocations larger than this in doublewords must go slow")\
2546                                                                             \
2547   product(bool, AggressiveOpts, false,                                      \
2548           "Enable aggressive optimizations - see arguments.cpp")            \
2549                                                                             \
2550   product(bool, UseStringCache, false,                                      \
2551           "Enable String cache capabilities on String.java")                \
2552                                                                             \
2553   /* statistics */                                                          \
2554   develop(bool, CountCompiledCalls, false,                                  \
2555           "counts method invocations")                                      \
2556                                                                             \
2557   notproduct(bool, CountRuntimeCalls, false,                                \
2558           "counts VM runtime calls")                                        \
2559                                                                             \
2560   develop(bool, CountJNICalls, false,                                       \
2561           "counts jni method invocations")                                  \
2562                                                                             \
2563   notproduct(bool, CountJVMCalls, false,                                    \
2564           "counts jvm method invocations")                                  \
2565                                                                             \
2566   notproduct(bool, CountRemovableExceptions, false,                         \
2567           "count exceptions that could be replaced by branches due to "     \
2568           "inlining")                                                       \
2569                                                                             \
2570   notproduct(bool, ICMissHistogram, false,                                  \
2571           "produce histogram of IC misses")                                 \
2572                                                                             \
2573   notproduct(bool, PrintClassStatistics, false,                             \
2574           "prints class statistics at end of run")                          \
2575                                                                             \
2576   notproduct(bool, PrintMethodStatistics, false,                            \
2577           "prints method statistics at end of run")                         \
2578                                                                             \
2579   /* interpreter */                                                         \
2580   develop(bool, ClearInterpreterLocals, false,                              \
2581           "Always clear local variables of interpreter activations upon "   \
2582           "entry")                                                          \
2583                                                                             \
2584   product_pd(bool, RewriteBytecodes,                                        \
2585           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2586                                                                             \
2587   product_pd(bool, RewriteFrequentPairs,                                    \
2588           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2589                                                                             \
2590   diagnostic(bool, PrintInterpreter, false,                                 \
2591           "Prints the generated interpreter code")                          \
2592                                                                             \
2593   product(bool, UseInterpreter, true,                                       \
2594           "Use interpreter for non-compiled methods")                       \
2595                                                                             \
2596   develop(bool, UseFastSignatureHandlers, true,                             \
2597           "Use fast signature handlers for native calls")                   \
2598                                                                             \
2599   develop(bool, UseV8InstrsOnly, false,                                     \
2600           "Use SPARC-V8 Compliant instruction subset")                      \
2601                                                                             \
2602   product(bool, UseNiagaraInstrs, false,                                    \
2603           "Use Niagara-efficient instruction subset")                       \
2604                                                                             \
2605   develop(bool, UseCASForSwap, false,                                       \
2606           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2607                                                                             \
2608   product(bool, UseLoopCounter, true,                                       \
2609           "Increment invocation counter on backward branch")                \
2610                                                                             \
2611   product(bool, UseFastEmptyMethods, true,                                  \
2612           "Use fast method entry code for empty methods")                   \
2613                                                                             \
2614   product(bool, UseFastAccessorMethods, true,                               \
2615           "Use fast method entry code for accessor methods")                \
2616                                                                             \
2617   product_pd(bool, UseOnStackReplacement,                                   \
2618            "Use on stack replacement, calls runtime if invoc. counter "     \
2619            "overflows in loop")                                             \
2620                                                                             \
2621   notproduct(bool, TraceOnStackReplacement, false,                          \
2622           "Trace on stack replacement")                                     \
2623                                                                             \
2624   develop(bool, PoisonOSREntry, true,                                       \
2625            "Detect abnormal calls to OSR code")                             \
2626                                                                             \
2627   product_pd(bool, PreferInterpreterNativeStubs,                            \
2628           "Use always interpreter stubs for native methods invoked via "    \
2629           "interpreter")                                                    \
2630                                                                             \
2631   develop(bool, CountBytecodes, false,                                      \
2632           "Count number of bytecodes executed")                             \
2633                                                                             \
2634   develop(bool, PrintBytecodeHistogram, false,                              \
2635           "Print histogram of the executed bytecodes")                      \
2636                                                                             \
2637   develop(bool, PrintBytecodePairHistogram, false,                          \
2638           "Print histogram of the executed bytecode pairs")                 \
2639                                                                             \
2640   diagnostic(bool, PrintSignatureHandlers, false,                           \
2641           "Print code generated for native method signature handlers")      \
2642                                                                             \
2643   develop(bool, VerifyOops, false,                                          \
2644           "Do plausibility checks for oops")                                \
2645                                                                             \
2646   develop(bool, CheckUnhandledOops, false,                                  \
2647           "Check for unhandled oops in VM code")                            \
2648                                                                             \
2649   develop(bool, VerifyJNIFields, trueInDebug,                               \
2650           "Verify jfieldIDs for instance fields")                           \
2651                                                                             \
2652   notproduct(bool, VerifyJNIEnvThread, false,                               \
2653           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2654           "from JNI")                                                       \
2655                                                                             \
2656   develop(bool, VerifyFPU, false,                                           \
2657           "Verify FPU state (check for NaN's, etc.)")                       \
2658                                                                             \
2659   develop(bool, VerifyThread, false,                                        \
2660           "Watch the thread register for corruption (SPARC only)")          \
2661                                                                             \
2662   develop(bool, VerifyActivationFrameSize, false,                           \
2663           "Verify that activation frame didn't become smaller than its "    \
2664           "minimal size")                                                   \
2665                                                                             \
2666   develop(bool, TraceFrequencyInlining, false,                              \
2667           "Trace frequency based inlining")                                 \
2668                                                                             \
2669   notproduct(bool, TraceTypeProfile, false,                                 \
2670           "Trace type profile")                                             \
2671                                                                             \
2672   develop_pd(bool, InlineIntrinsics,                                        \
2673            "Inline intrinsics that can be statically resolved")             \
2674                                                                             \
2675   product_pd(bool, ProfileInterpreter,                                      \
2676            "Profile at the bytecode level during interpretation")           \
2677                                                                             \
2678   develop_pd(bool, ProfileTraps,                                            \
2679           "Profile deoptimization traps at the bytecode level")             \
2680                                                                             \
2681   product(intx, ProfileMaturityPercentage, 20,                              \
2682           "number of method invocations/branches (expressed as % of "       \
2683           "CompileThreshold) before using the method's profile")            \
2684                                                                             \
2685   develop(bool, PrintMethodData, false,                                     \
2686            "Print the results of +ProfileInterpreter at end of run")        \
2687                                                                             \
2688   develop(bool, VerifyDataPointer, trueInDebug,                             \
2689           "Verify the method data pointer during interpreter profiling")    \
2690                                                                             \
2691   develop(bool, VerifyCompiledCode, false,                                  \
2692           "Include miscellaneous runtime verifications in nmethod code; "   \
2693           "default off because it disturbs nmethod size heuristics")        \
2694                                                                             \
2695   notproduct(bool, CrashGCForDumpingJavaThread, false,                      \
2696           "Manually make GC thread crash then dump java stack trace;  "     \
2697           "Test only")                                                      \
2698                                                                             \
2699   /* compilation */                                                         \
2700   product(bool, UseCompiler, true,                                          \
2701           "use compilation")                                                \
2702                                                                             \
2703   develop(bool, TraceCompilationPolicy, false,                              \
2704           "Trace compilation policy")                                       \
2705                                                                             \
2706   develop(bool, TimeCompilationPolicy, false,                               \
2707           "Time the compilation policy")                                    \
2708                                                                             \
2709   product(bool, UseCounterDecay, true,                                      \
2710            "adjust recompilation counters")                                 \
2711                                                                             \
2712   develop(intx, CounterHalfLifeTime,    30,                                 \
2713           "half-life time of invocation counters (in secs)")                \
2714                                                                             \
2715   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2716           "Min. ms. between invocation of CounterDecay")                    \
2717                                                                             \
2718   product(bool, AlwaysCompileLoopMethods, false,                            \
2719           "when using recompilation, never interpret methods "              \
2720           "containing loops")                                               \
2721                                                                             \
2722   product(bool, DontCompileHugeMethods, true,                               \
2723           "don't compile methods > HugeMethodLimit")                        \
2724                                                                             \
2725   /* Bytecode escape analysis estimation. */                                \
2726   product(bool, EstimateArgEscape, true,                                    \
2727           "Analyze bytecodes to estimate escape state of arguments")        \
2728                                                                             \
2729   product(intx, BCEATraceLevel, 0,                                          \
2730           "How much tracing to do of bytecode escape analysis estimates")   \
2731                                                                             \
2732   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2733           "Maximum number of nested calls that are analyzed by BC EA.")     \
2734                                                                             \
2735   product(intx, MaxBCEAEstimateSize, 150,                                   \
2736           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2737                                                                             \
2738   product(intx,  AllocatePrefetchStyle, 1,                                  \
2739           "0 = no prefetch, "                                               \
2740           "1 = prefetch instructions for each allocation, "                 \
2741           "2 = use TLAB watermark to gate allocation prefetch, "            \
2742           "3 = use BIS instruction on Sparc for allocation prefetch")       \
2743                                                                             \
2744   product(intx,  AllocatePrefetchDistance, -1,                              \
2745           "Distance to prefetch ahead of allocation pointer")               \
2746                                                                             \
2747   product(intx,  AllocatePrefetchLines, 1,                                  \
2748           "Number of lines to prefetch ahead of allocation pointer")        \
2749                                                                             \
2750   product(intx,  AllocatePrefetchStepSize, 16,                              \
2751           "Step size in bytes of sequential prefetch instructions")         \
2752                                                                             \
2753   product(intx,  AllocatePrefetchInstr, 0,                                  \
2754           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2755                                                                             \
2756   product(intx,  ReadPrefetchInstr, 0,                                      \
2757           "Prefetch instruction to prefetch ahead")                         \
2758                                                                             \
2759   /* deoptimization */                                                      \
2760   develop(bool, TraceDeoptimization, false,                                 \
2761           "Trace deoptimization")                                           \
2762                                                                             \
2763   develop(bool, DebugDeoptimization, false,                                 \
2764           "Tracing various information while debugging deoptimization")     \
2765                                                                             \
2766   product(intx, SelfDestructTimer, 0,                                       \
2767           "Will cause VM to terminate after a given time (in minutes) "     \
2768           "(0 means off)")                                                  \
2769                                                                             \
2770   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2771           "Max. no. of lines in the stack trace for Java exceptions "       \
2772           "(0 means all)")                                                  \
2773                                                                             \
2774   develop(intx, GuaranteedSafepointInterval, 1000,                          \
2775           "Guarantee a safepoint (at least) every so many milliseconds "    \
2776           "(0 means none)")                                                 \
2777                                                                             \
2778   product(intx, SafepointTimeoutDelay, 10000,                               \
2779           "Delay in milliseconds for option SafepointTimeout")              \
2780                                                                             \
2781   product(intx, NmethodSweepFraction, 4,                                    \
2782           "Number of invocations of sweeper to cover all nmethods")         \
2783                                                                             \
2784   product(intx, NmethodSweepCheckInterval, 5,                               \
2785           "Compilers wake up every n seconds to possibly sweep nmethods")   \
2786                                                                             \
2787   notproduct(intx, MemProfilingInterval, 500,                               \
2788           "Time between each invocation of the MemProfiler")                \
2789                                                                             \
2790   develop(intx, MallocCatchPtr, -1,                                         \
2791           "Hit breakpoint when mallocing/freeing this pointer")             \
2792                                                                             \
2793   notproduct(intx, AssertRepeat, 1,                                         \
2794           "number of times to evaluate expression in assert "               \
2795           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2796                                                                             \
2797   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2798           "List of assertions (file:line) to muzzle")                       \
2799                                                                             \
2800   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2801           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2802           "is used")                                                        \
2803                                                                             \
2804   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2805           "Threshold for total handle allocation when "                     \
2806           "+TraceHandleAllocation is used")                                 \
2807                                                                             \
2808   develop(intx, StackPrintLimit, 100,                                       \
2809           "number of stack frames to print in VM-level stack dump")         \
2810                                                                             \
2811   notproduct(intx, MaxElementPrintSize, 256,                                \
2812           "maximum number of elements to print")                            \
2813                                                                             \
2814   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2815           "maximum number of subklasses to print when printing klass")      \
2816                                                                             \
2817   product(intx, MaxInlineLevel, 9,                                          \
2818           "maximum number of nested calls that are inlined")                \
2819                                                                             \
2820   product(intx, MaxRecursiveInlineLevel, 1,                                 \
2821           "maximum number of nested recursive calls that are inlined")      \
2822                                                                             \
2823   product_pd(intx, InlineSmallCode,                                         \
2824           "Only inline already compiled methods if their code size is "     \
2825           "less than this")                                                 \
2826                                                                             \
2827   product(intx, MaxInlineSize, 35,                                          \
2828           "maximum bytecode size of a method to be inlined")                \
2829                                                                             \
2830   product_pd(intx, FreqInlineSize,                                          \
2831           "maximum bytecode size of a frequent method to be inlined")       \
2832                                                                             \
2833   product(intx, MaxTrivialSize, 6,                                          \
2834           "maximum bytecode size of a trivial method to be inlined")        \
2835                                                                             \
2836   product(intx, MinInliningThreshold, 250,                                  \
2837           "min. invocation count a method needs to have to be inlined")     \
2838                                                                             \
2839   develop(intx, AlignEntryCode, 4,                                          \
2840           "aligns entry code to specified value (in bytes)")                \
2841                                                                             \
2842   develop(intx, MethodHistogramCutoff, 100,                                 \
2843           "cutoff value for method invoc. histogram (+CountCalls)")         \
2844                                                                             \
2845   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2846           "# of interpreted methods to show in profile")                    \
2847                                                                             \
2848   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2849           "# of compiled methods to show in profile")                       \
2850                                                                             \
2851   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2852           "# of stub methods to show in profile")                           \
2853                                                                             \
2854   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2855           "# of runtime stub nodes to show in profile")                     \
2856                                                                             \
2857   product(intx, ProfileIntervalsTicks, 100,                                 \
2858           "# of ticks between printing of interval profile "                \
2859           "(+ProfileIntervals)")                                            \
2860                                                                             \
2861   notproduct(intx, ScavengeALotInterval,     1,                             \
2862           "Interval between which scavenge will occur with +ScavengeALot")  \
2863                                                                             \
2864   notproduct(intx, FullGCALotInterval,     1,                               \
2865           "Interval between which full gc will occur with +FullGCALot")     \
2866                                                                             \
2867   notproduct(intx, FullGCALotStart,     0,                                  \
2868           "For which invocation to start FullGCAlot")                       \
2869                                                                             \
2870   notproduct(intx, FullGCALotDummies,  32*K,                                \
2871           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2872           "to move")                                                        \
2873                                                                             \
2874   develop(intx, DontYieldALotInterval,    10,                               \
2875           "Interval between which yields will be dropped (milliseconds)")   \
2876                                                                             \
2877   develop(intx, MinSleepInterval,     1,                                    \
2878           "Minimum sleep() interval (milliseconds) when "                   \
2879           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2880                                                                             \
2881   product(intx, EventLogLength,  2000,                                      \
2882           "maximum nof events in event log")                                \
2883                                                                             \
2884   develop(intx, ProfilerPCTickThreshold,    15,                             \
2885           "Number of ticks in a PC buckets to be a hotspot")                \
2886                                                                             \
2887   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2888           "Number of exits until DeoptimizeALot kicks in")                  \
2889                                                                             \
2890   notproduct(intx, ZombieALotInterval,     5,                               \
2891           "Number of exits until ZombieALot kicks in")                      \
2892                                                                             \
2893   develop(bool, StressNonEntrant, false,                                    \
2894           "Mark nmethods non-entrant at registration")                      \
2895                                                                             \
2896   diagnostic(intx, MallocVerifyInterval,     0,                             \
2897           "if non-zero, verify C heap after every N calls to "              \
2898           "malloc/realloc/free")                                            \
2899                                                                             \
2900   diagnostic(intx, MallocVerifyStart,     0,                                \
2901           "if non-zero, start verifying C heap after Nth call to "          \
2902           "malloc/realloc/free")                                            \
2903                                                                             \
2904   product(intx, TypeProfileWidth,      2,                                   \
2905           "number of receiver types to record in call/cast profile")        \
2906                                                                             \
2907   develop(intx, BciProfileWidth,      2,                                    \
2908           "number of return bci's to record in ret profile")                \
2909                                                                             \
2910   product(intx, PerMethodRecompilationCutoff, 400,                          \
2911           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2912                                                                             \
2913   product(intx, PerBytecodeRecompilationCutoff, 200,                        \
2914           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2915                                                                             \
2916   product(intx, PerMethodTrapLimit,  100,                                   \
2917           "Limit on traps (of one kind) in a method (includes inlines)")    \
2918                                                                             \
2919   product(intx, PerBytecodeTrapLimit,  4,                                   \
2920           "Limit on traps (of one kind) at a particular BCI")               \
2921                                                                             \
2922   develop(intx, FreqCountInvocations,  1,                                   \
2923           "Scaling factor for branch frequencies (deprecated)")             \
2924                                                                             \
2925   develop(intx, InlineFrequencyRatio,    20,                                \
2926           "Ratio of call site execution to caller method invocation")       \
2927                                                                             \
2928   develop_pd(intx, InlineFrequencyCount,                                    \
2929           "Count of call site execution necessary to trigger frequent "     \
2930           "inlining")                                                       \
2931                                                                             \
2932   develop(intx, InlineThrowCount,    50,                                    \
2933           "Force inlining of interpreted methods that throw this often")    \
2934                                                                             \
2935   develop(intx, InlineThrowMaxSize,   200,                                  \
2936           "Force inlining of throwing methods smaller than this")           \
2937                                                                             \
2938   product(intx, AliasLevel,     3,                                          \
2939           "0 for no aliasing, 1 for oop/field/static/array split, "         \
2940           "2 for class split, 3 for unique instances")                      \
2941                                                                             \
2942   develop(bool, VerifyAliases, false,                                       \
2943           "perform extra checks on the results of alias analysis")          \
2944                                                                             \
2945   develop(intx, ProfilerNodeSize,  1024,                                    \
2946           "Size in K to allocate for the Profile Nodes of each thread")     \
2947                                                                             \
2948   develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
2949           "Number of times to spin wait on a v8 atomic operation lock")     \
2950                                                                             \
2951   product(intx, ReadSpinIterations,   100,                                  \
2952           "Number of read attempts before a yield (spin inner loop)")       \
2953                                                                             \
2954   product_pd(intx, PreInflateSpin,                                          \
2955           "Number of times to spin wait before inflation")                  \
2956                                                                             \
2957   product(intx, PreBlockSpin,    10,                                        \
2958           "Number of times to spin in an inflated lock before going to "    \
2959           "an OS lock")                                                     \
2960                                                                             \
2961   /* gc parameters */                                                       \
2962   product(uintx, InitialHeapSize, 0,                                        \
2963           "Initial heap size (in bytes); zero means OldSize + NewSize")     \
2964                                                                             \
2965   product(uintx, MaxHeapSize, ScaleForWordSize(96*M),                       \
2966           "Maximum heap size (in bytes)")                                   \
2967                                                                             \
2968   product(uintx, OldSize, ScaleForWordSize(4*M),                            \
2969           "Initial tenured generation size (in bytes)")                     \
2970                                                                             \
2971   product(uintx, NewSize, ScaleForWordSize(1*M),                            \
2972           "Initial new generation size (in bytes)")                         \
2973                                                                             \
2974   product(uintx, MaxNewSize, max_uintx,                                     \
2975           "Maximum new generation size (in bytes), max_uintx means set "    \
2976           "ergonomically")                                                  \
2977                                                                             \
2978   product(uintx, PretenureSizeThreshold, 0,                                 \
2979           "Maximum size in bytes of objects allocated in DefNew "           \
2980           "generation; zero means no maximum")                              \
2981                                                                             \
2982   product(uintx, TLABSize, 0,                                               \
2983           "Starting TLAB size (in bytes); zero means set ergonomically")    \
2984                                                                             \
2985   product(uintx, MinTLABSize, 2*K,                                          \
2986           "Minimum allowed TLAB size (in bytes)")                           \
2987                                                                             \
2988   product(uintx, TLABAllocationWeight, 35,                                  \
2989           "Allocation averaging weight")                                    \
2990                                                                             \
2991   product(uintx, TLABWasteTargetPercent, 1,                                 \
2992           "Percentage of Eden that can be wasted")                          \
2993                                                                             \
2994   product(uintx, TLABRefillWasteFraction,    64,                            \
2995           "Max TLAB waste at a refill (internal fragmentation)")            \
2996                                                                             \
2997   product(uintx, TLABWasteIncrement,    4,                                  \
2998           "Increment allowed waste at slow allocation")                     \
2999                                                                             \
3000   product(intx, SurvivorRatio, 8,                                           \
3001           "Ratio of eden/survivor space size")                              \
3002                                                                             \
3003   product(intx, NewRatio, 2,                                                \
3004           "Ratio of new/old generation sizes")                              \
3005                                                                             \
3006   product(uintx, MaxLiveObjectEvacuationRatio, 100,                         \
3007           "Max percent of eden objects that will be live at scavenge")      \
3008                                                                             \
3009   product_pd(uintx, NewSizeThreadIncrease,                                  \
3010           "Additional size added to desired new generation size per "       \
3011           "non-daemon thread (in bytes)")                                   \
3012                                                                             \
3013   product_pd(uintx, PermSize,                                               \
3014           "Initial size of permanent generation (in bytes)")                \
3015                                                                             \
3016   product_pd(uintx, MaxPermSize,                                            \
3017           "Maximum size of permanent generation (in bytes)")                \
3018                                                                             \
3019   product(uintx, MinHeapFreeRatio,    40,                                   \
3020           "Min percentage of heap free after GC to avoid expansion")        \
3021                                                                             \
3022   product(uintx, MaxHeapFreeRatio,    70,                                   \
3023           "Max percentage of heap free after GC to avoid shrinking")        \
3024                                                                             \
3025   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
3026           "Number of milliseconds per MB of free space in the heap")        \
3027                                                                             \
3028   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
3029           "Min change in heap space due to GC (in bytes)")                  \
3030                                                                             \
3031   product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
3032           "Min expansion of permanent heap (in bytes)")                     \
3033                                                                             \
3034   product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
3035           "Max expansion of permanent heap without full GC (in bytes)")     \
3036                                                                             \
3037   product(intx, QueuedAllocationWarningCount, 0,                            \
3038           "Number of times an allocation that queues behind a GC "          \
3039           "will retry before printing a warning")                           \
3040                                                                             \
3041   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
3042           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
3043                                                                             \
3044   diagnostic(intx, VerifyGCLevel,     0,                                    \
3045           "Generation level at which to start +VerifyBefore/AfterGC")       \
3046                                                                             \
3047   develop(uintx, ExitAfterGCNum,   0,                                       \
3048           "If non-zero, exit after this GC.")                               \
3049                                                                             \
3050   product(intx, MaxTenuringThreshold,    15,                                \
3051           "Maximum value for tenuring threshold")                           \
3052                                                                             \
3053   product(intx, InitialTenuringThreshold,     7,                            \
3054           "Initial value for tenuring threshold")                           \
3055                                                                             \
3056   product(intx, TargetSurvivorRatio,    50,                                 \
3057           "Desired percentage of survivor space used after scavenge")       \
3058                                                                             \
3059   product(uintx, MarkSweepDeadRatio,     5,                                 \
3060           "Percentage (0-100) of the old gen allowed as dead wood."         \
3061           "Serial mark sweep treats this as both the min and max value."    \
3062           "CMS uses this value only if it falls back to mark sweep."        \
3063           "Par compact uses a variable scale based on the density of the"   \
3064           "generation and treats this as the max value when the heap is"    \
3065           "either completely full or completely empty.  Par compact also"   \
3066           "has a smaller default value; see arguments.cpp.")                \
3067                                                                             \
3068   product(uintx, PermMarkSweepDeadRatio,    20,                             \
3069           "Percentage (0-100) of the perm gen allowed as dead wood."        \
3070           "See MarkSweepDeadRatio for collector-specific comments.")        \
3071                                                                             \
3072   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
3073           "How often should we fully compact the heap (ignoring the dead "  \
3074           "space parameters)")                                              \
3075                                                                             \
3076   product(intx, PrintCMSStatistics, 0,                                      \
3077           "Statistics for CMS")                                             \
3078                                                                             \
3079   product(bool, PrintCMSInitiationStatistics, false,                        \
3080           "Statistics for initiating a CMS collection")                     \
3081                                                                             \
3082   product(intx, PrintFLSStatistics, 0,                                      \
3083           "Statistics for CMS' FreeListSpace")                              \
3084                                                                             \
3085   product(intx, PrintFLSCensus, 0,                                          \
3086           "Census for CMS' FreeListSpace")                                  \
3087                                                                             \
3088   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
3089           "Delay in ms between expansion and allocation")                   \
3090                                                                             \
3091   product(intx, DeferThrSuspendLoopCount,     4000,                         \
3092           "(Unstable) Number of times to iterate in safepoint loop "        \
3093           " before blocking VM threads ")                                   \
3094                                                                             \
3095   product(intx, DeferPollingPageLoopCount,     -1,                          \
3096           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
3097           "before changing safepoint polling page to RO ")                  \
3098                                                                             \
3099   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
3100                                                                             \
3101   product(bool, UseDepthFirstScavengeOrder, true,                           \
3102           "true: the scavenge order will be depth-first, "                  \
3103           "false: the scavenge order will be breadth-first")                \
3104                                                                             \
3105   product(bool, PSChunkLargeArrays, true,                                   \
3106           "true: process large arrays in chunks")                           \
3107                                                                             \
3108   product(uintx, GCDrainStackTargetSize, 64,                                \
3109           "how many entries we'll try to leave on the stack during "        \
3110           "parallel GC")                                                    \
3111                                                                             \
3112   /* stack parameters */                                                    \
3113   product_pd(intx, StackYellowPages,                                        \
3114           "Number of yellow zone (recoverable overflows) pages")            \
3115                                                                             \
3116   product_pd(intx, StackRedPages,                                           \
3117           "Number of red zone (unrecoverable overflows) pages")             \
3118                                                                             \
3119   product_pd(intx, StackShadowPages,                                        \
3120           "Number of shadow zone (for overflow checking) pages"             \
3121           " this should exceed the depth of the VM and native call stack")  \
3122                                                                             \
3123   product_pd(intx, ThreadStackSize,                                         \
3124           "Thread Stack Size (in Kbytes)")                                  \
3125                                                                             \
3126   product_pd(intx, VMThreadStackSize,                                       \
3127           "Non-Java Thread Stack Size (in Kbytes)")                         \
3128                                                                             \
3129   product_pd(intx, CompilerThreadStackSize,                                 \
3130           "Compiler Thread Stack Size (in Kbytes)")                         \
3131                                                                             \
3132   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
3133           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
3134                                                                             \
3135   product(uintx, ThreadSafetyMargin, 50*M,                                  \
3136           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
3137           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
3138           "disable this feature")                                           \
3139                                                                             \
3140   /* code cache parameters */                                               \
3141   develop(uintx, CodeCacheSegmentSize, 64,                                  \
3142           "Code cache segment size (in bytes) - smallest unit of "          \
3143           "allocation")                                                     \
3144                                                                             \
3145   develop_pd(intx, CodeEntryAlignment,                                      \
3146           "Code entry alignment for generated code (in bytes)")             \
3147                                                                             \
3148   product_pd(intx, OptoLoopAlignment,                                       \
3149           "Align inner loops to zero relative to this modulus")             \
3150                                                                             \
3151   product_pd(uintx, InitialCodeCacheSize,                                   \
3152           "Initial code cache size (in bytes)")                             \
3153                                                                             \
3154   product_pd(uintx, ReservedCodeCacheSize,                                  \
3155           "Reserved code cache size (in bytes) - maximum code cache size")  \
3156                                                                             \
3157   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
3158           "When less than X space left, we stop compiling.")                \
3159                                                                             \
3160   product_pd(uintx, CodeCacheExpansionSize,                                 \
3161           "Code cache expansion size (in bytes)")                           \
3162                                                                             \
3163   develop_pd(uintx, CodeCacheMinBlockLength,                                \
3164           "Minimum number of segments in a code cache block.")              \
3165                                                                             \
3166   notproduct(bool, ExitOnFullCodeCache, false,                              \
3167           "Exit the VM if we fill the code cache.")                         \
3168                                                                             \
3169   product(bool, UseCodeCacheFlushing, false,                                \
3170           "Attempt to clean the code cache before shutting off compiler")   \
3171                                                                             \
3172   product(intx,  MinCodeCacheFlushingInterval, 30,                          \
3173           "Min number of seconds between code cache cleaning sessions")     \
3174                                                                             \
3175   product(uintx,  CodeCacheFlushingMinimumFreeSpace, 1500*K,                \
3176           "When less than X space left, start code cache cleaning")         \
3177                                                                             \
3178   /* interpreter debugging */                                               \
3179   develop(intx, BinarySwitchThreshold, 5,                                   \
3180           "Minimal number of lookupswitch entries for rewriting to binary " \
3181           "switch")                                                         \
3182                                                                             \
3183   develop(intx, StopInterpreterAt, 0,                                       \
3184           "Stops interpreter execution at specified bytecode number")       \
3185                                                                             \
3186   develop(intx, TraceBytecodesAt, 0,                                        \
3187           "Traces bytecodes starting with specified bytecode number")       \
3188                                                                             \
3189   /* compiler interface */                                                  \
3190   develop(intx, CIStart, 0,                                                 \
3191           "the id of the first compilation to permit")                      \
3192                                                                             \
3193   develop(intx, CIStop,    -1,                                              \
3194           "the id of the last compilation to permit")                       \
3195                                                                             \
3196   develop(intx, CIStartOSR,     0,                                          \
3197           "the id of the first osr compilation to permit "                  \
3198           "(CICountOSR must be on)")                                        \
3199                                                                             \
3200   develop(intx, CIStopOSR,    -1,                                           \
3201           "the id of the last osr compilation to permit "                   \
3202           "(CICountOSR must be on)")                                        \
3203                                                                             \
3204   develop(intx, CIBreakAtOSR,    -1,                                        \
3205           "id of osr compilation to break at")                              \
3206                                                                             \
3207   develop(intx, CIBreakAt,    -1,                                           \
3208           "id of compilation to break at")                                  \
3209                                                                             \
3210   product(ccstrlist, CompileOnly, "",                                       \
3211           "List of methods (pkg/class.name) to restrict compilation to")    \
3212                                                                             \
3213   product(ccstr, CompileCommandFile, NULL,                                  \
3214           "Read compiler commands from this file [.hotspot_compiler]")      \
3215                                                                             \
3216   product(ccstrlist, CompileCommand, "",                                    \
3217           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
3218                                                                             \
3219   product(bool, CICompilerCountPerCPU, false,                               \
3220           "1 compiler thread for log(N CPUs)")                              \
3221                                                                             \
3222   develop(intx, CIFireOOMAt,    -1,                                         \
3223           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
3224           "(non-negative value throws OOM after this many CI accesses "     \
3225           "in each compile)")                                               \
3226                                                                             \
3227   develop(intx, CIFireOOMAtDelay, -1,                                       \
3228           "Wait for this many CI accesses to occur in all compiles before " \
3229           "beginning to throw OutOfMemoryErrors in each compile")           \
3230                                                                             \
3231   notproduct(bool, CIObjectFactoryVerify, false,                            \
3232           "enable potentially expensive verification in ciObjectFactory")   \
3233                                                                             \
3234   /* Priorities */                                                          \
3235   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
3236                                                                             \
3237   product(intx, ThreadPriorityPolicy, 0,                                    \
3238           "0 : Normal.                                                     "\
3239           "    VM chooses priorities that are appropriate for normal       "\
3240           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
3241           "    to normal native priority. Java priorities below NORM_PRIORITY"\
3242           "    map to lower native priority values. On Windows applications"\
3243           "    are allowed to use higher native priorities. However, with  "\
3244           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
3245           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
3246           "    interfere with system threads. On Linux thread priorities   "\
3247           "    are ignored because the OS does not support static priority "\
3248           "    in SCHED_OTHER scheduling class which is the only choice for"\
3249           "    non-root, non-realtime applications.                        "\
3250           "1 : Aggressive.                                                 "\
3251           "    Java thread priorities map over to the entire range of      "\
3252           "    native thread priorities. Higher Java thread priorities map "\
3253           "    to higher native thread priorities. This policy should be   "\
3254           "    used with care, as sometimes it can cause performance       "\
3255           "    degradation in the application and/or the entire system. On "\
3256           "    Linux this policy requires root privilege.")                 \
3257                                                                             \
3258   product(bool, ThreadPriorityVerbose, false,                               \
3259           "print priority changes")                                         \
3260                                                                             \
3261   product(intx, DefaultThreadPriority, -1,                                  \
3262           "what native priority threads run at if not specified elsewhere (-1 means no change)") \
3263                                                                             \
3264   product(intx, CompilerThreadPriority, -1,                                 \
3265           "what priority should compiler threads run at (-1 means no change)") \
3266                                                                             \
3267   product(intx, VMThreadPriority, -1,                                       \
3268           "what priority should VM threads run at (-1 means no change)")    \
3269                                                                             \
3270   product(bool, CompilerThreadHintNoPreempt, true,                          \
3271           "(Solaris only) Give compiler threads an extra quanta")           \
3272                                                                             \
3273   product(bool, VMThreadHintNoPreempt, false,                               \
3274           "(Solaris only) Give VM thread an extra quanta")                  \
3275                                                                             \
3276   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3277   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3278   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3279   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3280   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3281   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3282   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3283   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3284   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
3285   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
3286                                                                             \
3287   /* compiler debugging */                                                  \
3288   notproduct(intx, CompileTheWorldStartAt,     1,                           \
3289           "First class to consider when using +CompileTheWorld")            \
3290                                                                             \
3291   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
3292           "Last class to consider when using +CompileTheWorld")             \
3293                                                                             \
3294   develop(intx, NewCodeParameter,      0,                                   \
3295           "Testing Only: Create a dedicated integer parameter before "      \
3296           "putback")                                                        \
3297                                                                             \
3298   /* new oopmap storage allocation */                                       \
3299   develop(intx, MinOopMapAllocation,     8,                                 \
3300           "Minimum number of OopMap entries in an OopMapSet")               \
3301                                                                             \
3302   /* Background Compilation */                                              \
3303   develop(intx, LongCompileThreshold,     50,                               \
3304           "Used with +TraceLongCompiles")                                   \
3305                                                                             \
3306   product(intx, StarvationMonitorInterval,    200,                          \
3307           "Pause between each check in ms")                                 \
3308                                                                             \
3309   /* recompilation */                                                       \
3310   product_pd(intx, CompileThreshold,                                        \
3311           "number of interpreted method invocations before (re-)compiling") \
3312                                                                             \
3313   product_pd(intx, BackEdgeThreshold,                                       \
3314           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
3315                                                                             \
3316   product(intx, Tier1BytecodeLimit,      10,                                \
3317           "Must have at least this many bytecodes before tier1"             \
3318           "invocation counters are used")                                   \
3319                                                                             \
3320   product_pd(intx, Tier2CompileThreshold,                                   \
3321           "threshold at which a tier 2 compilation is invoked")             \
3322                                                                             \
3323   product_pd(intx, Tier2BackEdgeThreshold,                                  \
3324           "Back edge threshold at which a tier 2 compilation is invoked")   \
3325                                                                             \
3326   product_pd(intx, Tier3CompileThreshold,                                   \
3327           "threshold at which a tier 3 compilation is invoked")             \
3328                                                                             \
3329   product_pd(intx, Tier3BackEdgeThreshold,                                  \
3330           "Back edge threshold at which a tier 3 compilation is invoked")   \
3331                                                                             \
3332   product_pd(intx, Tier4CompileThreshold,                                   \
3333           "threshold at which a tier 4 compilation is invoked")             \
3334                                                                             \
3335   product_pd(intx, Tier4BackEdgeThreshold,                                  \
3336           "Back edge threshold at which a tier 4 compilation is invoked")   \
3337                                                                             \
3338   product_pd(bool, TieredCompilation,                                       \
3339           "Enable two-tier compilation")                                    \
3340                                                                             \
3341   product(bool, StressTieredRuntime, false,                                 \
3342           "Alternate client and server compiler on compile requests")       \
3343                                                                             \
3344   product_pd(intx, OnStackReplacePercentage,                                \
3345           "NON_TIERED number of method invocations/branches (expressed as %"\
3346           "of CompileThreshold) before (re-)compiling OSR code")            \
3347                                                                             \
3348   product(intx, InterpreterProfilePercentage, 33,                           \
3349           "NON_TIERED number of method invocations/branches (expressed as %"\
3350           "of CompileThreshold) before profiling in the interpreter")       \
3351                                                                             \
3352   develop(intx, MaxRecompilationSearchLength,    10,                        \
3353           "max. # frames to inspect searching for recompilee")              \
3354                                                                             \
3355   develop(intx, MaxInterpretedSearchLength,     3,                          \
3356           "max. # interp. frames to skip when searching for recompilee")    \
3357                                                                             \
3358   develop(intx, DesiredMethodLimit,  8000,                                  \
3359           "desired max. method size (in bytecodes) after inlining")         \
3360                                                                             \
3361   develop(intx, HugeMethodLimit,  8000,                                     \
3362           "don't compile methods larger than this if "                      \
3363           "+DontCompileHugeMethods")                                        \
3364                                                                             \
3365   /* New JDK 1.4 reflection implementation */                               \
3366                                                                             \
3367   develop(bool, UseNewReflection, true,                                     \
3368           "Temporary flag for transition to reflection based on dynamic "   \
3369           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3370           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3371           "changes were needed")                                            \
3372                                                                             \
3373   develop(bool, VerifyReflectionBytecodes, false,                           \
3374           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3375           "in situations like that described in 4486457 or for "            \
3376           "constructors generated for serialization, so can not be enabled "\
3377           "in product.")                                                    \
3378                                                                             \
3379   product(bool, ReflectionWrapResolutionErrors, true,                       \
3380           "Temporary flag for transition to AbstractMethodError wrapped "   \
3381           "in InvocationTargetException. See 6531596")                      \
3382                                                                             \
3383                                                                             \
3384   develop(intx, FastSuperclassLimit, 8,                                     \
3385           "Depth of hardwired instanceof accelerator array")                \
3386                                                                             \
3387   /* Properties for Java libraries  */                                      \
3388                                                                             \
3389   product(intx, MaxDirectMemorySize, -1,                                    \
3390           "Maximum total size of NIO direct-buffer allocations")            \
3391                                                                             \
3392   /* temporary developer defined flags  */                                  \
3393                                                                             \
3394   diagnostic(bool, UseNewCode, false,                                       \
3395           "Testing Only: Use the new version while testing")                \
3396                                                                             \
3397   diagnostic(bool, UseNewCode2, false,                                      \
3398           "Testing Only: Use the new version while testing")                \
3399                                                                             \
3400   diagnostic(bool, UseNewCode3, false,                                      \
3401           "Testing Only: Use the new version while testing")                \
3402                                                                             \
3403   /* flags for performance data collection */                               \
3404                                                                             \
3405   product(bool, UsePerfData, true,                                          \
3406           "Flag to disable jvmstat instrumentation for performance testing" \
3407           "and problem isolation purposes.")                                \
3408                                                                             \
3409   product(bool, PerfDataSaveToFile, false,                                  \
3410           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3411                                                                             \
3412   product(ccstr, PerfDataSaveFile, NULL,                                    \
3413           "Save PerfData memory to the specified absolute pathname,"        \
3414            "%p in the file name if present will be replaced by pid")        \
3415                                                                             \
3416   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3417           "Data sampling interval in milliseconds")                         \
3418                                                                             \
3419   develop(bool, PerfTraceDataCreation, false,                               \
3420           "Trace creation of Performance Data Entries")                     \
3421                                                                             \
3422   develop(bool, PerfTraceMemOps, false,                                     \
3423           "Trace PerfMemory create/attach/detach calls")                    \
3424                                                                             \
3425   product(bool, PerfDisableSharedMem, false,                                \
3426           "Store performance data in standard memory")                      \
3427                                                                             \
3428   product(intx, PerfDataMemorySize, 32*K,                                   \
3429           "Size of performance data memory region. Will be rounded "        \
3430           "up to a multiple of the native os page size.")                   \
3431                                                                             \
3432   product(intx, PerfMaxStringConstLength, 1024,                             \
3433           "Maximum PerfStringConstant string length before truncation")     \
3434                                                                             \
3435   product(bool, PerfAllowAtExitRegistration, false,                         \
3436           "Allow registration of atexit() methods")                         \
3437                                                                             \
3438   product(bool, PerfBypassFileSystemCheck, false,                           \
3439           "Bypass Win32 file system criteria checks (Windows Only)")        \
3440                                                                             \
3441   product(intx, UnguardOnExecutionViolation, 0,                             \
3442           "Unguard page and retry on no-execute fault (Win32 only)"         \
3443           "0=off, 1=conservative, 2=aggressive")                            \
3444                                                                             \
3445   /* Serviceability Support */                                              \
3446                                                                             \
3447   product(bool, ManagementServer, false,                                    \
3448           "Create JMX Management Server")                                   \
3449                                                                             \
3450   product(bool, DisableAttachMechanism, false,                              \
3451          "Disable mechanism that allows tools to attach to this VM")        \
3452                                                                             \
3453   product(bool, StartAttachListener, false,                                 \
3454           "Always start Attach Listener at VM startup")                     \
3455                                                                             \
3456   manageable(bool, PrintConcurrentLocks, false,                             \
3457           "Print java.util.concurrent locks in thread dump")                \
3458                                                                             \
3459   /* Shared spaces */                                                       \
3460                                                                             \
3461   product(bool, UseSharedSpaces, true,                                      \
3462           "Use shared spaces in the permanent generation")                  \
3463                                                                             \
3464   product(bool, RequireSharedSpaces, false,                                 \
3465           "Require shared spaces in the permanent generation")              \
3466                                                                             \
3467   product(bool, ForceSharedSpaces, false,                                   \
3468           "Require shared spaces in the permanent generation")              \
3469                                                                             \
3470   product(bool, DumpSharedSpaces, false,                                    \
3471            "Special mode: JVM reads a class list, loads classes, builds "   \
3472             "shared spaces, and dumps the shared spaces to a file to be "   \
3473             "used in future JVM runs.")                                     \
3474                                                                             \
3475   product(bool, PrintSharedSpaces, false,                                   \
3476           "Print usage of shared spaces")                                   \
3477                                                                             \
3478   product(uintx, SharedDummyBlockSize, 512*M,                               \
3479           "Size of dummy block used to shift heap addresses (in bytes)")    \
3480                                                                             \
3481   product(uintx, SharedReadWriteSize,  12*M,                                \
3482           "Size of read-write space in permanent generation (in bytes)")    \
3483                                                                             \
3484   product(uintx, SharedReadOnlySize,   10*M,                                \
3485           "Size of read-only space in permanent generation (in bytes)")     \
3486                                                                             \
3487   product(uintx, SharedMiscDataSize,    4*M,                                \
3488           "Size of the shared data area adjacent to the heap (in bytes)")   \
3489                                                                             \
3490   product(uintx, SharedMiscCodeSize,    4*M,                                \
3491           "Size of the shared code area adjacent to the heap (in bytes)")   \
3492                                                                             \
3493   diagnostic(bool, SharedOptimizeColdStart, true,                           \
3494           "At dump time, order shared objects to achieve better "           \
3495           "cold startup time.")                                             \
3496                                                                             \
3497   develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3498           "Reordering policy for SharedOptimizeColdStart "                  \
3499           "0=favor classload-time locality, 1=balanced, "                   \
3500           "2=favor runtime locality")                                       \
3501                                                                             \
3502   diagnostic(bool, SharedSkipVerify, false,                                 \
3503           "Skip assert() and verify() which page-in unwanted shared "       \
3504           "objects. ")                                                      \
3505                                                                             \
3506   product(bool, AnonymousClasses, false,                                    \
3507           "support sun.misc.Unsafe.defineAnonymousClass")                   \
3508                                                                             \
3509   experimental(bool, EnableMethodHandles, false,                            \
3510           "support method handles (true by default under JSR 292)")         \
3511                                                                             \
3512   diagnostic(intx, MethodHandlePushLimit, 3,                                \
3513           "number of additional stack slots a method handle may push")      \
3514                                                                             \
3515   develop(bool, TraceMethodHandles, false,                                  \
3516           "trace internal method handle operations")                        \
3517                                                                             \
3518   diagnostic(bool, VerifyMethodHandles, trueInDebug,                        \
3519           "perform extra checks when constructing method handles")          \
3520                                                                             \
3521   diagnostic(bool, OptimizeMethodHandles, true,                             \
3522           "when constructing method handles, try to improve them")          \
3523                                                                             \
3524   experimental(bool, TrustFinalNonStaticFields, false,                      \
3525           "trust final non-static declarations for constant folding")       \
3526                                                                             \
3527   experimental(bool, EnableInvokeDynamic, false,                            \
3528           "recognize the invokedynamic instruction")                        \
3529                                                                             \
3530   experimental(bool, AllowTransitionalJSR292, true,                         \
3531           "recognize pre-PFD formats of invokedynamic")                     \
3532                                                                             \
3533   develop(bool, TraceInvokeDynamic, false,                                  \
3534           "trace internal invoke dynamic operations")                       \
3535                                                                             \
3536   diagnostic(bool, PauseAtStartup,      false,                              \
3537           "Causes the VM to pause at startup time and wait for the pause "  \
3538           "file to be removed (default: ./vm.paused.<pid>)")                \
3539                                                                             \
3540   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3541           "The file to create and for whose removal to await when pausing " \
3542           "at startup. (default: ./vm.paused.<pid>)")                       \
3543                                                                             \
3544   product(bool, ExtendedDTraceProbes,    false,                             \
3545           "Enable performance-impacting dtrace probes")                     \
3546                                                                             \
3547   product(bool, DTraceMethodProbes, false,                                  \
3548           "Enable dtrace probes for method-entry and method-exit")          \
3549                                                                             \
3550   product(bool, DTraceAllocProbes, false,                                   \
3551           "Enable dtrace probes for object allocation")                     \
3552                                                                             \
3553   product(bool, DTraceMonitorProbes, false,                                 \
3554           "Enable dtrace probes for monitor events")                        \
3555                                                                             \
3556   product(bool, RelaxAccessControlCheck, false,                             \
3557           "Relax the access control checks in the verifier")                \
3558                                                                             \
3559   diagnostic(bool, PrintDTraceDOF, false,                                   \
3560              "Print the DTrace DOF passed to the system for JSDT probes")   \
3561                                                                             \
3562   product(bool, UseVMInterruptibleIO, false,                                \
3563           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3564           "EINTR for I/O operations results in OS_INTRPT. The default value"\
3565           " of this flag is true for JDK 6 and earliers")
3566 
3567 /*
3568  *  Macros for factoring of globals
3569  */
3570 
3571 // Interface macros
3572 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3573 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3574 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3575 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name;
3576 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3577 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3578 #ifdef PRODUCT
3579 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3580 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3581 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3582 #else
3583 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3584 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3585 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3586 #endif
3587 // Special LP64 flags, product only needed for now.
3588 #ifdef _LP64
3589 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name;
3590 #else
3591 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value;
3592 #endif // _LP64
3593 
3594 // Implementation macros
3595 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3596 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3597 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3598 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value;
3599 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3600 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3601 #ifdef PRODUCT
3602 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3603 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3604 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3605 #else
3606 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3607 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3608 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3609 #endif
3610 #ifdef _LP64
3611 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3612 #else
3613 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */
3614 #endif // _LP64
3615 
3616 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)
3617 
3618 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)