1 /*
   2  * Copyright 1997-2007 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  *
  23  */
  24 
  25 #if !defined(COMPILER1) && !defined(COMPILER2)
  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, NewSizeThreadIncrease,        4*K);
  51 define_pd_global(intx, NewRatio,                     4);
  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(uintx, DefaultMaxRAM,               1*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   const char *kind;
  94   FlagValueOrigin origin;
  95 
  96   // points to all Flags static array
  97   static Flag *flags;
  98 
  99   // number of flags
 100   static size_t numFlags;
 101 
 102   static Flag* find_flag(char* name, size_t length);
 103 
 104   bool is_bool() const        { return strcmp(type, "bool") == 0; }
 105   bool get_bool() const       { return *((bool*) addr); }
 106   void set_bool(bool value)   { *((bool*) addr) = value; }
 107 
 108   bool is_intx()  const       { return strcmp(type, "intx")  == 0; }
 109   intx get_intx() const       { return *((intx*) addr); }
 110   void set_intx(intx value)   { *((intx*) addr) = value; }
 111 
 112   bool is_uintx() const       { return strcmp(type, "uintx") == 0; }
 113   uintx get_uintx() const     { return *((uintx*) addr); }
 114   void set_uintx(uintx value) { *((uintx*) addr) = value; }
 115 
 116   bool is_double() const        { return strcmp(type, "double") == 0; }
 117   double get_double() const     { return *((double*) addr); }
 118   void set_double(double value) { *((double*) addr) = value; }
 119 
 120   bool is_ccstr() const          { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; }
 121   bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; }
 122   ccstr get_ccstr() const     { return *((ccstr*) addr); }
 123   void set_ccstr(ccstr value) { *((ccstr*) addr) = value; }
 124 
 125   bool is_unlocker() const;
 126   bool is_unlocked() const;
 127   bool is_writeable() const;
 128   bool is_external() const;
 129 
 130   void print_on(outputStream* st);
 131   void print_as_flag(outputStream* st);
 132 };
 133 
 134 // debug flags control various aspects of the VM and are global accessible
 135 
 136 // use FlagSetting to temporarily change some debug flag
 137 // e.g. FlagSetting fs(DebugThisAndThat, true);
 138 // restored to previous value upon leaving scope
 139 class FlagSetting {
 140   bool val;
 141   bool* flag;
 142  public:
 143   FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; }
 144   ~FlagSetting()                       { *flag = val; }
 145 };
 146 
 147 
 148 class CounterSetting {
 149   intx* counter;
 150  public:
 151   CounterSetting(intx* cnt) { counter = cnt; (*counter)++; }
 152   ~CounterSetting()         { (*counter)--; }
 153 };
 154 
 155 
 156 class IntFlagSetting {
 157   intx val;
 158   intx* flag;
 159  public:
 160   IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; }
 161   ~IntFlagSetting()                       { *flag = val; }
 162 };
 163 
 164 
 165 class DoubleFlagSetting {
 166   double val;
 167   double* flag;
 168  public:
 169   DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; }
 170   ~DoubleFlagSetting()                           { *flag = val; }
 171 };
 172 
 173 
 174 class CommandLineFlags {
 175  public:
 176   static bool boolAt(char* name, size_t len, bool* value);
 177   static bool boolAt(char* name, bool* value)      { return boolAt(name, strlen(name), value); }
 178   static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin);
 179   static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin)   { return boolAtPut(name, strlen(name), value, origin); }
 180 
 181   static bool intxAt(char* name, size_t len, intx* value);
 182   static bool intxAt(char* name, intx* value)      { return intxAt(name, strlen(name), value); }
 183   static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin);
 184   static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin)   { return intxAtPut(name, strlen(name), value, origin); }
 185 
 186   static bool uintxAt(char* name, size_t len, uintx* value);
 187   static bool uintxAt(char* name, uintx* value)    { return uintxAt(name, strlen(name), value); }
 188   static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin);
 189   static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); }
 190 
 191   static bool doubleAt(char* name, size_t len, double* value);
 192   static bool doubleAt(char* name, double* value)    { return doubleAt(name, strlen(name), value); }
 193   static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin);
 194   static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); }
 195 
 196   static bool ccstrAt(char* name, size_t len, ccstr* value);
 197   static bool ccstrAt(char* name, ccstr* value)    { return ccstrAt(name, strlen(name), value); }
 198   static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin);
 199   static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); }
 200 
 201   // Returns false if name is not a command line flag.
 202   static bool wasSetOnCmdline(const char* name, bool* value);
 203   static void printSetFlags();
 204 
 205   static void printFlags() PRODUCT_RETURN;
 206 
 207   static void verify() PRODUCT_RETURN;
 208 };
 209 
 210 // use this for flags that are true by default in the debug version but
 211 // false in the optimized version, and vice versa
 212 #ifdef ASSERT
 213 #define trueInDebug  true
 214 #define falseInDebug false
 215 #else
 216 #define trueInDebug  false
 217 #define falseInDebug true
 218 #endif
 219 
 220 // use this for flags that are true per default in the product build
 221 // but false in development builds, and vice versa
 222 #ifdef PRODUCT
 223 #define trueInProduct  true
 224 #define falseInProduct false
 225 #else
 226 #define trueInProduct  false
 227 #define falseInProduct true
 228 #endif
 229 
 230 // use this for flags that are true per default in the tiered build
 231 // but false in non-tiered builds, and vice versa
 232 #ifdef TIERED
 233 #define  trueInTiered true
 234 #define falseInTiered false
 235 #else
 236 #define  trueInTiered false
 237 #define falseInTiered true
 238 #endif
 239 
 240 
 241 // develop flags are settable / visible only during development and are constant in the PRODUCT version
 242 // product flags are always settable / visible
 243 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version
 244 
 245 // A flag must be declared with one of the following types:
 246 // bool, intx, uintx, ccstr.
 247 // The type "ccstr" is an alias for "const char*" and is used
 248 // only in this file, because the macrology requires single-token type names.
 249 
 250 // Note: Diagnostic options not meant for VM tuning or for product modes.
 251 // They are to be used for VM quality assurance or field diagnosis
 252 // of VM bugs.  They are hidden so that users will not be encouraged to
 253 // try them as if they were VM ordinary execution options.  However, they
 254 // are available in the product version of the VM.  Under instruction
 255 // from support engineers, VM customers can turn them on to collect
 256 // diagnostic information about VM problems.  To use a VM diagnostic
 257 // option, you must first specify +UnlockDiagnosticVMOptions.
 258 // (This master switch also affects the behavior of -Xprintflags.)
 259 
 260 // manageable flags are writeable external product flags.
 261 //    They are dynamically writeable through the JDK management interface
 262 //    (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole.
 263 //    These flags are external exported interface (see CCC).  The list of
 264 //    manageable flags can be queried programmatically through the management
 265 //    interface.
 266 //
 267 //    A flag can be made as "manageable" only if
 268 //    - the flag is defined in a CCC as an external exported interface.
 269 //    - the VM implementation supports dynamic setting of the flag.
 270 //      This implies that the VM must *always* query the flag variable
 271 //      and not reuse state related to the flag state at any given time.
 272 //    - you want the flag to be queried programmatically by the customers.
 273 //
 274 // product_rw flags are writeable internal product flags.
 275 //    They are like "manageable" flags but for internal/private use.
 276 //    The list of product_rw flags are internal/private flags which
 277 //    may be changed/removed in a future release.  It can be set
 278 //    through the management interface to get/set value
 279 //    when the name of flag is supplied.
 280 //
 281 //    A flag can be made as "product_rw" only if
 282 //    - the VM implementation supports dynamic setting of the flag.
 283 //      This implies that the VM must *always* query the flag variable
 284 //      and not reuse state related to the flag state at any given time.
 285 //
 286 // Note that when there is a need to support develop flags to be writeable,
 287 // it can be done in the same way as product_rw.
 288 
 289 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, notproduct, manageable, product_rw) \
 290                                                                             \
 291   /* UseMembar is theoretically a temp flag used for memory barrier         \
 292    * removal testing.  It was supposed to be removed before FCS but has     \
 293    * been re-added (see 6401008) */                                         \
 294   product(bool, UseMembar, false,                                           \
 295           "(Unstable) Issues membars on thread state transitions")          \
 296                                                                             \
 297   product(bool, PrintCommandLineFlags, false,                               \
 298           "Prints flags that appeared on the command line")                 \
 299                                                                             \
 300   diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug,                  \
 301           "Enable processing of flags relating to field diagnostics")       \
 302                                                                             \
 303   product(bool, JavaMonitorsInStackTrace, true,                             \
 304           "Print info. about Java monitor locks when the stacks are dumped")\
 305                                                                             \
 306   product_pd(bool, UseLargePages,                                           \
 307           "Use large page memory")                                          \
 308                                                                             \
 309   develop(bool, TracePageSizes, false,                                      \
 310           "Trace page size selection and usage.")                           \
 311                                                                             \
 312   product(bool, UseNUMA, false,                                             \
 313           "Use NUMA if available")                                          \
 314                                                                             \
 315   product(intx, NUMAChunkResizeWeight, 20,                                  \
 316           "Percentage (0-100) used to weight the current sample when "      \
 317           "computing exponentially decaying average for "                   \
 318           "AdaptiveNUMAChunkSizing")                                        \
 319                                                                             \
 320   product(intx, NUMASpaceResizeRate, 1*G,                                   \
 321           "Do not reallocate more that this amount per collection")         \
 322                                                                             \
 323   product(bool, UseAdaptiveNUMAChunkSizing, true,                           \
 324           "Enable adaptive chunk sizing for NUMA")                          \
 325                                                                             \
 326   product(bool, NUMAStats, false,                                           \
 327           "Print NUMA stats in detailed heap information")                  \
 328                                                                             \
 329   product(intx, NUMAPageScanRate, 256,                                      \
 330           "Maximum number of pages to include in the page scan procedure")  \
 331                                                                             \
 332   product_pd(bool, NeedsDeoptSuspend,                                       \
 333           "True for register window machines (sparc/ia64)")                 \
 334                                                                             \
 335   product(intx, UseSSE, 99,                                                 \
 336           "Highest supported SSE instructions set on x86/x64")              \
 337                                                                             \
 338   product(uintx, LargePageSizeInBytes, 0,                                   \
 339           "Large page size (0 to let VM choose the page size")              \
 340                                                                             \
 341   product(uintx, LargePageHeapSizeThreshold, 128*M,                         \
 342           "Use large pages if max heap is at least this big")               \
 343                                                                             \
 344   product(bool, ForceTimeHighResolution, false,                             \
 345           "Using high time resolution(For Win32 only)")                     \
 346                                                                             \
 347   product(bool, CacheTimeMillis, false,                                     \
 348           "Cache os::javaTimeMillis with CacheTimeMillisGranularity")       \
 349                                                                             \
 350   diagnostic(uintx, CacheTimeMillisGranularity, 50,                         \
 351           "Granularity for CacheTimeMillis")                                \
 352                                                                             \
 353   develop(bool, TraceItables, false,                                        \
 354           "Trace initialization and use of itables")                        \
 355                                                                             \
 356   develop(bool, TracePcPatching, false,                                     \
 357           "Trace usage of frame::patch_pc")                                 \
 358                                                                             \
 359   develop(bool, TraceJumps, false,                                          \
 360           "Trace assembly jumps in thread ring buffer")                     \
 361                                                                             \
 362   develop(bool, TraceRelocator, false,                                      \
 363           "Trace the bytecode relocator")                                   \
 364                                                                             \
 365   develop(bool, TraceLongCompiles, false,                                   \
 366           "Print out every time compilation is longer than "                \
 367           "a given threashold")                                             \
 368                                                                             \
 369   develop(bool, SafepointALot, false,                                       \
 370           "Generates a lot of safepoints. Works with "                      \
 371           "GuaranteedSafepointInterval")                                    \
 372                                                                             \
 373   product_pd(bool, BackgroundCompilation,                                   \
 374           "A thread requesting compilation is not blocked during "          \
 375           "compilation")                                                    \
 376                                                                             \
 377   product(bool, PrintVMQWaitTime, false,                                    \
 378           "Prints out the waiting time in VM operation queue")              \
 379                                                                             \
 380   develop(bool, BailoutToInterpreterForThrows, false,                       \
 381           "Compiled methods which throws/catches exceptions will be "       \
 382           "deopt and intp.")                                                \
 383                                                                             \
 384   develop(bool, NoYieldsInMicrolock, false,                                 \
 385           "Disable yields in microlock")                                    \
 386                                                                             \
 387   develop(bool, TraceOopMapGeneration, false,                               \
 388           "Shows oopmap generation")                                        \
 389                                                                             \
 390   product(bool, MethodFlushing, true,                                       \
 391           "Reclamation of zombie and not-entrant methods")                  \
 392                                                                             \
 393   develop(bool, VerifyStack, false,                                         \
 394           "Verify stack of each thread when it is entering a runtime call") \
 395                                                                             \
 396   develop(bool, ForceUnreachable, false,                                    \
 397           "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \
 398                                                                             \
 399   notproduct(bool, StressDerivedPointers, false,                            \
 400           "Force scavenge when a derived pointers is detected on stack "    \
 401           "after rtm call")                                                 \
 402                                                                             \
 403   develop(bool, TraceDerivedPointers, false,                                \
 404           "Trace traversal of derived pointers on stack")                   \
 405                                                                             \
 406   notproduct(bool, TraceCodeBlobStacks, false,                              \
 407           "Trace stack-walk of codeblobs")                                  \
 408                                                                             \
 409   product(bool, PrintJNIResolving, false,                                   \
 410           "Used to implement -v:jni")                                       \
 411                                                                             \
 412   notproduct(bool, PrintRewrites, false,                                    \
 413           "Print methods that are being rewritten")                         \
 414                                                                             \
 415   product(bool, UseInlineCaches, true,                                      \
 416           "Use Inline Caches for virtual calls ")                           \
 417                                                                             \
 418   develop(bool, InlineArrayCopy, true,                                      \
 419           "inline arraycopy native that is known to be part of "            \
 420           "base library DLL")                                               \
 421                                                                             \
 422   develop(bool, InlineObjectHash, true,                                     \
 423           "inline Object::hashCode() native that is known to be part "      \
 424           "of base library DLL")                                            \
 425                                                                             \
 426   develop(bool, InlineObjectCopy, true,                                     \
 427           "inline Object.clone and Arrays.copyOf[Range] intrinsics")        \
 428                                                                             \
 429   develop(bool, InlineNatives, true,                                        \
 430           "inline natives that are known to be part of base library DLL")   \
 431                                                                             \
 432   develop(bool, InlineMathNatives, true,                                    \
 433           "inline SinD, CosD, etc.")                                        \
 434                                                                             \
 435   develop(bool, InlineClassNatives, true,                                   \
 436           "inline Class.isInstance, etc")                                   \
 437                                                                             \
 438   develop(bool, InlineAtomicLong, true,                                     \
 439           "inline sun.misc.AtomicLong")                                     \
 440                                                                             \
 441   develop(bool, InlineThreadNatives, true,                                  \
 442           "inline Thread.currentThread, etc")                               \
 443                                                                             \
 444   develop(bool, InlineReflectionGetCallerClass, true,                       \
 445           "inline sun.reflect.Reflection.getCallerClass(), known to be part "\
 446           "of base library DLL")                                            \
 447                                                                             \
 448   develop(bool, InlineUnsafeOps, true,                                      \
 449           "inline memory ops (native methods) from sun.misc.Unsafe")        \
 450                                                                             \
 451   develop(bool, ConvertCmpD2CmpF, true,                                     \
 452           "Convert cmpD to cmpF when one input is constant in float range") \
 453                                                                             \
 454   develop(bool, ConvertFloat2IntClipping, true,                             \
 455           "Convert float2int clipping idiom to integer clipping")           \
 456                                                                             \
 457   develop(bool, SpecialStringCompareTo, true,                               \
 458           "special version of string compareTo")                            \
 459                                                                             \
 460   develop(bool, SpecialStringIndexOf, true,                                 \
 461           "special version of string indexOf")                              \
 462                                                                             \
 463   develop(bool, TraceCallFixup, false,                                      \
 464           "traces all call fixups")                                         \
 465                                                                             \
 466   develop(bool, DeoptimizeALot, false,                                      \
 467           "deoptimize at every exit from the runtime system")               \
 468                                                                             \
 469   develop(ccstrlist, DeoptimizeOnlyAt, "",                                  \
 470           "a comma separated list of bcis to deoptimize at")                \
 471                                                                             \
 472   product(bool, DeoptimizeRandom, false,                                    \
 473           "deoptimize random frames on random exit from the runtime system")\
 474                                                                             \
 475   notproduct(bool, ZombieALot, false,                                       \
 476           "creates zombies (non-entrant) at exit from the runt. system")    \
 477                                                                             \
 478   notproduct(bool, WalkStackALot, false,                                    \
 479           "trace stack (no print) at every exit from the runtime system")   \
 480                                                                             \
 481   develop(bool, Debugging, false,                                           \
 482           "set when executing debug methods in debug.ccp "                  \
 483           "(to prevent triggering assertions)")                             \
 484                                                                             \
 485   notproduct(bool, StrictSafepointChecks, trueInDebug,                      \
 486           "Enable strict checks that safepoints cannot happen for threads " \
 487           "that used No_Safepoint_Verifier")                                \
 488                                                                             \
 489   notproduct(bool, VerifyLastFrame, false,                                  \
 490           "Verify oops on last frame on entry to VM")                       \
 491                                                                             \
 492   develop(bool, TraceHandleAllocation, false,                               \
 493           "Prints out warnings when suspicious many handles are allocated") \
 494                                                                             \
 495   product(bool, UseCompilerSafepoints, true,                                \
 496           "Stop at safepoints in compiled code")                            \
 497                                                                             \
 498   product(bool, UseSplitVerifier, true,                                     \
 499           "use split verifier with StackMapTable attributes")               \
 500                                                                             \
 501   product(bool, FailOverToOldVerifier, true,                                \
 502           "fail over to old verifier when split verifier fails")            \
 503                                                                             \
 504   develop(bool, ShowSafepointMsgs, false,                                   \
 505           "Show msg. about safepoint synch.")                               \
 506                                                                             \
 507   product(bool, SafepointTimeout, false,                                    \
 508           "Time out and warn or fail after SafepointTimeoutDelay "          \
 509           "milliseconds if failed to reach safepoint")                      \
 510                                                                             \
 511   develop(bool, DieOnSafepointTimeout, false,                               \
 512           "Die upon failure to reach safepoint (see SafepointTimeout)")     \
 513                                                                             \
 514   /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */      \
 515   /* typically, at most a few retries are needed */                         \
 516   product(intx, SuspendRetryCount, 50,                                      \
 517           "Maximum retry count for an external suspend request")            \
 518                                                                             \
 519   product(intx, SuspendRetryDelay, 5,                                       \
 520           "Milliseconds to delay per retry (* current_retry_count)")        \
 521                                                                             \
 522   product(bool, AssertOnSuspendWaitFailure, false,                          \
 523           "Assert/Guarantee on external suspend wait failure")              \
 524                                                                             \
 525   product(bool, TraceSuspendWaitFailures, false,                            \
 526           "Trace external suspend wait failures")                           \
 527                                                                             \
 528   product(bool, MaxFDLimit, true,                                           \
 529           "Bump the number of file descriptors to max in solaris.")         \
 530                                                                             \
 531   notproduct(bool, LogEvents, trueInDebug,                                  \
 532           "Enable Event log")                                               \
 533                                                                             \
 534   product(bool, BytecodeVerificationRemote, true,                           \
 535           "Enables the Java bytecode verifier for remote classes")          \
 536                                                                             \
 537   product(bool, BytecodeVerificationLocal, false,                           \
 538           "Enables the Java bytecode verifier for local classes")           \
 539                                                                             \
 540   develop(bool, ForceFloatExceptions, trueInDebug,                          \
 541           "Force exceptions on FP stack under/overflow")                    \
 542                                                                             \
 543   develop(bool, SoftMatchFailure, trueInProduct,                            \
 544           "If the DFA fails to match a node, print a message and bail out") \
 545                                                                             \
 546   develop(bool, VerifyStackAtCalls, false,                                  \
 547           "Verify that the stack pointer is unchanged after calls")         \
 548                                                                             \
 549   develop(bool, TraceJavaAssertions, false,                                 \
 550           "Trace java language assertions")                                 \
 551                                                                             \
 552   notproduct(bool, CheckAssertionStatusDirectives, false,                   \
 553           "temporary - see javaClasses.cpp")                                \
 554                                                                             \
 555   notproduct(bool, PrintMallocFree, false,                                  \
 556           "Trace calls to C heap malloc/free allocation")                   \
 557                                                                             \
 558   notproduct(bool, PrintOopAddress, false,                                  \
 559           "Always print the location of the oop")                           \
 560                                                                             \
 561   notproduct(bool, VerifyCodeCacheOften, false,                             \
 562           "Verify compiled-code cache often")                               \
 563                                                                             \
 564   develop(bool, ZapDeadCompiledLocals, false,                               \
 565           "Zap dead locals in compiler frames")                             \
 566                                                                             \
 567   notproduct(bool, ZapDeadLocalsOld, false,                                 \
 568           "Zap dead locals (old version, zaps all frames when "             \
 569           "entering the VM")                                                \
 570                                                                             \
 571   notproduct(bool, CheckOopishValues, false,                                \
 572           "Warn if value contains oop ( requires ZapDeadLocals)")           \
 573                                                                             \
 574   develop(bool, UseMallocOnly, false,                                       \
 575           "use only malloc/free for allocation (no resource area/arena)")   \
 576                                                                             \
 577   develop(bool, PrintMalloc, false,                                         \
 578           "print all malloc/free calls")                                    \
 579                                                                             \
 580   develop(bool, ZapResourceArea, trueInDebug,                               \
 581           "Zap freed resource/arena space with 0xABABABAB")                 \
 582                                                                             \
 583   notproduct(bool, ZapVMHandleArea, trueInDebug,                            \
 584           "Zap freed VM handle space with 0xBCBCBCBC")                      \
 585                                                                             \
 586   develop(bool, ZapJNIHandleArea, trueInDebug,                              \
 587           "Zap freed JNI handle space with 0xFEFEFEFE")                     \
 588                                                                             \
 589   develop(bool, ZapUnusedHeapArea, trueInDebug,                             \
 590           "Zap unused heap space with 0xBAADBABE")                          \
 591                                                                             \
 592   develop(bool, PrintVMMessages, true,                                      \
 593           "Print vm messages on console")                                   \
 594                                                                             \
 595   product(bool, PrintGCApplicationConcurrentTime, false,                    \
 596           "Print the time the application has been running")                \
 597                                                                             \
 598   product(bool, PrintGCApplicationStoppedTime, false,                       \
 599           "Print the time the application has been stopped")                \
 600                                                                             \
 601   develop(bool, Verbose, false,                                             \
 602           "Prints additional debugging information from other modes")       \
 603                                                                             \
 604   develop(bool, PrintMiscellaneous, false,                                  \
 605           "Prints uncategorized debugging information (requires +Verbose)") \
 606                                                                             \
 607   develop(bool, WizardMode, false,                                          \
 608           "Prints much more debugging information")                         \
 609                                                                             \
 610   product(bool, ShowMessageBoxOnError, false,                               \
 611           "Keep process alive on VM fatal error")                           \
 612                                                                             \
 613   product_pd(bool, UseOSErrorReporting,                                     \
 614           "Let VM fatal error propagate to the OS (ie. WER on Windows)")    \
 615                                                                             \
 616   product(bool, SuppressFatalErrorMessage, false,                           \
 617           "Do NO Fatal Error report [Avoid deadlock]")                      \
 618                                                                             \
 619   product(ccstrlist, OnError, "",                                           \
 620           "Run user-defined commands on fatal error; see VMError.cpp "      \
 621           "for examples")                                                   \
 622                                                                             \
 623   product(ccstrlist, OnOutOfMemoryError, "",                                \
 624           "Run user-defined commands on first java.lang.OutOfMemoryError")  \
 625                                                                             \
 626   manageable(bool, HeapDumpOnOutOfMemoryError, false,                       \
 627           "Dump heap to file when java.lang.OutOfMemoryError is thrown")    \
 628                                                                             \
 629   manageable(ccstr, HeapDumpPath, NULL,                                     \
 630           "When HeapDumpOnOutOfMemoryError is on, the path (filename or"    \
 631           "directory) of the dump file (defaults to java_pid<pid>.hprof"    \
 632           "in the working directory)")                                      \
 633                                                                             \
 634   develop(uintx, SegmentedHeapDumpThreshold, 2*G,                           \
 635           "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) "     \
 636           "when the heap usage is larger than this")                        \
 637                                                                             \
 638   develop(uintx, HeapDumpSegmentSize, 1*G,                                  \
 639           "Approximate segment size when generating a segmented heap dump") \
 640                                                                             \
 641   develop(bool, BreakAtWarning, false,                                      \
 642           "Execute breakpoint upon encountering VM warning")                \
 643                                                                             \
 644   product_pd(bool, UseVectoredExceptions,                                   \
 645           "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \
 646                                                                             \
 647   develop(bool, TraceVMOperation, false,                                    \
 648           "Trace vm operations")                                            \
 649                                                                             \
 650   develop(bool, UseFakeTimers, false,                                       \
 651           "Tells whether the VM should use system time or a fake timer")    \
 652                                                                             \
 653   diagnostic(bool, LogCompilation, false,                                   \
 654           "Log compilation activity in detail to hotspot.log or LogFile")   \
 655                                                                             \
 656   product(bool, PrintCompilation, false,                                    \
 657           "Print compilations")                                             \
 658                                                                             \
 659   diagnostic(bool, TraceNMethodInstalls, false,                             \
 660              "Trace nmethod intallation")                                   \
 661                                                                             \
 662   diagnostic(bool, TraceOSRBreakpoint, false,                               \
 663              "Trace OSR Breakpoint ")                                       \
 664                                                                             \
 665   diagnostic(bool, TraceCompileTriggered, false,                            \
 666              "Trace compile triggered")                                     \
 667                                                                             \
 668   diagnostic(bool, TraceTriggers, false,                                    \
 669              "Trace triggers")                                              \
 670                                                                             \
 671   product(bool, AlwaysRestoreFPU, false,                                    \
 672           "Restore the FPU control word after every JNI call (expensive)")  \
 673                                                                             \
 674   notproduct(bool, PrintCompilation2, false,                                \
 675           "Print additional statistics per compilation")                    \
 676                                                                             \
 677   notproduct(bool, PrintAdapterHandlers, false,                             \
 678           "Print code generated for i2c/c2i adapters")                      \
 679                                                                             \
 680   develop(bool, PrintAssembly, false,                                       \
 681           "Print assembly code")                                            \
 682                                                                             \
 683   develop(bool, PrintNMethods, false,                                       \
 684           "Print assembly code for nmethods when generated")                \
 685                                                                             \
 686   develop(bool, PrintNativeNMethods, false,                                 \
 687           "Print assembly code for native nmethods when generated")         \
 688                                                                             \
 689   develop(bool, PrintDebugInfo, false,                                      \
 690           "Print debug information for all nmethods when generated")        \
 691                                                                             \
 692   develop(bool, PrintRelocations, false,                                    \
 693           "Print relocation information for all nmethods when generated")   \
 694                                                                             \
 695   develop(bool, PrintDependencies, false,                                   \
 696           "Print dependency information for all nmethods when generated")   \
 697                                                                             \
 698   develop(bool, PrintExceptionHandlers, false,                              \
 699           "Print exception handler tables for all nmethods when generated") \
 700                                                                             \
 701   develop(bool, InterceptOSException, false,                                \
 702           "Starts debugger when an implicit OS (e.g., NULL) "               \
 703           "exception happens")                                              \
 704                                                                             \
 705   notproduct(bool, PrintCodeCache, false,                                   \
 706           "Print the compiled_code cache when exiting")                     \
 707                                                                             \
 708   develop(bool, PrintCodeCache2, false,                                     \
 709           "Print detailed info on the compiled_code cache when exiting")    \
 710                                                                             \
 711   develop(bool, PrintStubCode, false,                                       \
 712           "Print generated stub code")                                      \
 713                                                                             \
 714   product(bool, StackTraceInThrowable, true,                                \
 715           "Collect backtrace in throwable when exception happens")          \
 716                                                                             \
 717   product(bool, OmitStackTraceInFastThrow, true,                            \
 718           "Omit backtraces for some 'hot' exceptions in optimized code")    \
 719                                                                             \
 720   product(bool, ProfilerPrintByteCodeStatistics, false,                     \
 721           "Prints byte code statictics when dumping profiler output")       \
 722                                                                             \
 723   product(bool, ProfilerRecordPC, false,                                    \
 724           "Collects tick for each 16 byte interval of compiled code")       \
 725                                                                             \
 726   product(bool, ProfileVM,  false,                                          \
 727           "Profiles ticks that fall within VM (either in the VM Thread "    \
 728           "or VM code called through stubs)")                               \
 729                                                                             \
 730   product(bool, ProfileIntervals, false,                                    \
 731           "Prints profiles for each interval (see ProfileIntervalsTicks)")  \
 732                                                                             \
 733   notproduct(bool, ProfilerCheckIntervals, false,                           \
 734           "Collect and print info on spacing of profiler ticks")            \
 735                                                                             \
 736   develop(bool, PrintJVMWarnings, false,                                    \
 737           "Prints warnings for unimplemented JVM functions")                \
 738                                                                             \
 739   notproduct(uintx, WarnOnStalledSpinLock, 0,                               \
 740           "Prints warnings for stalled SpinLocks")                          \
 741                                                                             \
 742   develop(bool, InitializeJavaLangSystem, true,                             \
 743           "Initialize java.lang.System - turn off for individual "          \
 744           "method debugging")                                               \
 745                                                                             \
 746   develop(bool, InitializeJavaLangString, true,                             \
 747           "Initialize java.lang.String - turn off for individual "          \
 748           "method debugging")                                               \
 749                                                                             \
 750   develop(bool, InitializeJavaLangExceptionsErrors, true,                   \
 751           "Initialize various error and exception classes - turn off for "  \
 752           "individual method debugging")                                    \
 753                                                                             \
 754   product(bool, RegisterFinalizersAtInit, true,                             \
 755           "Register finalizable objects at end of Object.<init> or "        \
 756           "after allocation.")                                              \
 757                                                                             \
 758   develop(bool, RegisterReferences, true,                                   \
 759           "Tells whether the VM should register soft/weak/final/phantom "   \
 760           "references")                                                     \
 761                                                                             \
 762   develop(bool, IgnoreRewrites, false,                                      \
 763           "Supress rewrites of bytecodes in the oopmap generator. "         \
 764           "This is unsafe!")                                                \
 765                                                                             \
 766   develop(bool, PrintCodeCacheExtension, false,                             \
 767           "Print extension of code cache")                                  \
 768                                                                             \
 769   develop(bool, UsePrivilegedStack, true,                                   \
 770           "Enable the security JVM functions")                              \
 771                                                                             \
 772   develop(bool, IEEEPrecision, true,                                        \
 773           "Enables IEEE precision (for INTEL only)")                        \
 774                                                                             \
 775   develop(bool, ProtectionDomainVerification, true,                         \
 776           "Verifies protection domain before resolution in system "         \
 777           "dictionary")                                                     \
 778                                                                             \
 779   product(bool, ClassUnloading, true,                                       \
 780           "Do unloading of classes")                                        \
 781                                                                             \
 782   develop(bool, DisableStartThread, false,                                  \
 783           "Disable starting of additional Java threads "                    \
 784           "(for debugging only)")                                           \
 785                                                                             \
 786   develop(bool, MemProfiling, false,                                        \
 787           "Write memory usage profiling to log file")                       \
 788                                                                             \
 789   notproduct(bool, PrintSystemDictionaryAtExit, false,                      \
 790           "Prints the system dictionary at exit")                           \
 791                                                                             \
 792   diagnostic(bool, UnsyncloadClass, false,                                  \
 793           "Unstable: VM calls loadClass unsynchronized. Custom classloader "\
 794           "must call VM synchronized for findClass & defineClass")          \
 795                                                                             \
 796   product_pd(bool, DontYieldALot,                                           \
 797           "Throw away obvious excess yield calls (for SOLARIS only)")       \
 798                                                                             \
 799   product_pd(bool, ConvertSleepToYield,                                     \
 800           "Converts sleep(0) to thread yield "                              \
 801           "(may be off for SOLARIS to improve GUI)")                        \
 802                                                                             \
 803   product(bool, ConvertYieldToSleep, false,                                 \
 804           "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\
 805           "behavior (SOLARIS only)")                                        \
 806                                                                             \
 807   product(bool, UseBoundThreads, true,                                      \
 808           "Bind user level threads to kernel threads (for SOLARIS only)")   \
 809                                                                             \
 810   develop(bool, UseDetachedThreads, true,                                   \
 811           "Use detached threads that are recycled upon termination "        \
 812           "(for SOLARIS only)")                                             \
 813                                                                             \
 814   product(bool, UseLWPSynchronization, true,                                \
 815           "Use LWP-based instead of libthread-based synchronization "       \
 816           "(SPARC only)")                                                   \
 817                                                                             \
 818   product(ccstr, SyncKnobs, "",                                             \
 819           "(Unstable) Various monitor synchronization tunables")            \
 820                                                                             \
 821   product(intx, EmitSync, 0,                                                \
 822           "(Unsafe,Unstable) "                                              \
 823           " Controls emission of inline sync fast-path code")               \
 824                                                                             \
 825   product(intx, AlwaysInflate, 0, "(Unstable) Force inflation")             \
 826                                                                             \
 827   product(intx, Atomics, 0,                                                 \
 828           "(Unsafe,Unstable) Diagnostic - Controls emission of atomics")    \
 829                                                                             \
 830   product(intx, FenceInstruction, 0,                                        \
 831           "(Unsafe,Unstable) Experimental")                                 \
 832                                                                             \
 833   product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \
 834                                                                             \
 835   product(intx, SyncVerbose, 0, "(Unstable)" )                              \
 836                                                                             \
 837   product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" )                    \
 838                                                                             \
 839   product(intx, hashCode, 0,                                                \
 840          "(Unstable) select hashCode generation algorithm" )                \
 841                                                                             \
 842   product(intx, WorkAroundNPTLTimedWaitHang, 1,                             \
 843          "(Unstable, Linux-specific)"                                       \
 844          " avoid NPTL-FUTEX hang pthread_cond_timedwait" )                  \
 845                                                                             \
 846   product(bool, FilterSpuriousWakeups , true,                               \
 847           "Prevent spurious or premature wakeups from object.wait"              \
 848           "(Solaris only)")                                                     \
 849                                                                             \
 850   product(intx, NativeMonitorTimeout, -1, "(Unstable)" )                    \
 851   product(intx, NativeMonitorFlags, 0, "(Unstable)" )                       \
 852   product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" )                  \
 853                                                                             \
 854   develop(bool, UsePthreads, false,                                         \
 855           "Use pthread-based instead of libthread-based synchronization "   \
 856           "(SPARC only)")                                                   \
 857                                                                             \
 858   product(bool, AdjustConcurrency, false,                                   \
 859           "call thr_setconcurrency at thread create time to avoid "         \
 860           "LWP starvation on MP systems (For Solaris Only)")                \
 861                                                                             \
 862   develop(bool, UpdateHotSpotCompilerFileOnError, true,                     \
 863           "Should the system attempt to update the compiler file when "     \
 864           "an error occurs?")                                               \
 865                                                                             \
 866   product(bool, ReduceSignalUsage, false,                                   \
 867           "Reduce the use of OS signals in Java and/or the VM")             \
 868                                                                             \
 869   notproduct(bool, ValidateMarkSweep, false,                                \
 870           "Do extra validation during MarkSweep collection")                \
 871                                                                             \
 872   notproduct(bool, RecordMarkSweepCompaction, false,                        \
 873           "Enable GC-to-GC recording and querying of compaction during "    \
 874           "MarkSweep")                                                      \
 875                                                                             \
 876   develop_pd(bool, ShareVtableStubs,                                        \
 877           "Share vtable stubs (smaller code but worse branch prediction")   \
 878                                                                             \
 879   develop(bool, LoadLineNumberTables, true,                                 \
 880           "Tells whether the class file parser loads line number tables")   \
 881                                                                             \
 882   develop(bool, LoadLocalVariableTables, true,                              \
 883           "Tells whether the class file parser loads local variable tables")\
 884                                                                             \
 885   develop(bool, LoadLocalVariableTypeTables, true,                          \
 886           "Tells whether the class file parser loads local variable type tables")\
 887                                                                             \
 888   product(bool, AllowUserSignalHandlers, false,                             \
 889           "Do not complain if the application installs signal handlers "    \
 890           "(Solaris & Linux only)")                                         \
 891                                                                             \
 892   product(bool, UseSignalChaining, true,                                    \
 893           "Use signal-chaining to invoke signal handlers installed "        \
 894           "by the application (Solaris & Linux only)")                      \
 895                                                                             \
 896   product(bool, UseAltSigs, false,                                          \
 897           "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM "      \
 898           "internal signals. (Solaris only)")                               \
 899                                                                             \
 900   product(bool, UseSpinning, false,                                         \
 901           "Use spinning in monitor inflation and before entry")             \
 902                                                                             \
 903   product(bool, PreSpinYield, false,                                        \
 904           "Yield before inner spinning loop")                               \
 905                                                                             \
 906   product(bool, PostSpinYield, true,                                        \
 907           "Yield after inner spinning loop")                                \
 908                                                                             \
 909   product(bool, AllowJNIEnvProxy, false,                                    \
 910           "Allow JNIEnv proxies for jdbx")                                  \
 911                                                                             \
 912   product(bool, JNIDetachReleasesMonitors, true,                            \
 913           "JNI DetachCurrentThread releases monitors owned by thread")      \
 914                                                                             \
 915   product(bool, RestoreMXCSROnJNICalls, false,                              \
 916           "Restore MXCSR when returning from JNI calls")                    \
 917                                                                             \
 918   product(bool, CheckJNICalls, false,                                       \
 919           "Verify all arguments to JNI calls")                              \
 920                                                                             \
 921   product(bool, UseFastJNIAccessors, true,                                  \
 922           "Use optimized versions of Get<Primitive>Field")                  \
 923                                                                             \
 924   product(bool, EagerXrunInit, false,                                       \
 925           "Eagerly initialize -Xrun libraries; allows startup profiling, "  \
 926           " but not all -Xrun libraries may support the state of the VM at this time") \
 927                                                                             \
 928   product(bool, PreserveAllAnnotations, false,                              \
 929           "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \
 930                                                                             \
 931   develop(uintx, PreallocatedOutOfMemoryErrorCount, 4,                      \
 932           "Number of OutOfMemoryErrors preallocated with backtrace")        \
 933                                                                             \
 934   product(bool, LazyBootClassLoader, true,                                  \
 935           "Enable/disable lazy opening of boot class path entries")         \
 936                                                                             \
 937   diagnostic(bool, UseIncDec, true,                                         \
 938           "Use INC, DEC instructions on x86")                               \
 939                                                                             \
 940   product(bool, UseStoreImmI16, true,                                       \
 941           "Use store immediate 16-bits value instruction on x86")           \
 942                                                                             \
 943   product(bool, UseAddressNop, false,                                       \
 944           "Use '0F 1F [addr]' NOP instructions on x86 cpus")                \
 945                                                                             \
 946   product(bool, UseXmmLoadAndClearUpper, true,                              \
 947           "Load low part of XMM register and clear upper part")             \
 948                                                                             \
 949   product(bool, UseXmmRegToRegMoveAll, false,                               \
 950           "Copy all XMM register bits when moving value between registers") \
 951                                                                             \
 952   product(intx, FieldsAllocationStyle, 1,                                   \
 953           "0 - type based with oops first, 1 - with oops last")             \
 954                                                                             \
 955   product(bool, CompactFields, true,                                        \
 956           "Allocate nonstatic fields in gaps between previous fields")      \
 957                                                                             \
 958   notproduct(bool, PrintCompactFieldsSavings, false,                        \
 959           "Print how many words were saved with CompactFields")             \
 960                                                                             \
 961   product(bool, UseBiasedLocking, true,                                     \
 962           "Enable biased locking in JVM")                                   \
 963                                                                             \
 964   product(intx, BiasedLockingStartupDelay, 4000,                            \
 965           "Number of milliseconds to wait before enabling biased locking")  \
 966                                                                             \
 967   diagnostic(bool, PrintBiasedLockingStatistics, false,                     \
 968           "Print statistics of biased locking in JVM")                      \
 969                                                                             \
 970   product(intx, BiasedLockingBulkRebiasThreshold, 20,                       \
 971           "Threshold of number of revocations per type to try to "          \
 972           "rebias all objects in the heap of that type")                    \
 973                                                                             \
 974   product(intx, BiasedLockingBulkRevokeThreshold, 40,                       \
 975           "Threshold of number of revocations per type to permanently "     \
 976           "revoke biases of all objects in the heap of that type")          \
 977                                                                             \
 978   product(intx, BiasedLockingDecayTime, 25000,                              \
 979           "Decay time (in milliseconds) to re-enable bulk rebiasing of a "  \
 980           "type after previous bulk rebias")                                \
 981                                                                             \
 982   /* tracing */                                                             \
 983                                                                             \
 984   notproduct(bool, TraceRuntimeCalls, false,                                \
 985           "Trace run-time calls")                                           \
 986                                                                             \
 987   develop(bool, TraceJNICalls, false,                                       \
 988           "Trace JNI calls")                                                \
 989                                                                             \
 990   notproduct(bool, TraceJVMCalls, false,                                    \
 991           "Trace JVM calls")                                                \
 992                                                                             \
 993   product(ccstr, TraceJVMTI, "",                                            \
 994           "Trace flags for JVMTI functions and events")                     \
 995                                                                             \
 996   /* This option can change an EMCP method into an obsolete method. */      \
 997   /* This can affect tests that except specific methods to be EMCP. */      \
 998   /* This option should be used with caution. */                            \
 999   product(bool, StressLdcRewrite, false,                                    \
1000           "Force ldc -> ldc_w rewrite during RedefineClasses")              \
1001                                                                             \
1002   product(intx, TraceRedefineClasses, 0,                                    \
1003           "Trace level for JVMTI RedefineClasses")                          \
1004                                                                             \
1005   /* change to false by default sometime after Mustang */                   \
1006   product(bool, VerifyMergedCPBytecodes, true,                              \
1007           "Verify bytecodes after RedefineClasses constant pool merging")   \
1008                                                                             \
1009   develop(bool, TraceJNIHandleAllocation, false,                            \
1010           "Trace allocation/deallocation of JNI handle blocks")             \
1011                                                                             \
1012   develop(bool, TraceThreadEvents, false,                                   \
1013           "Trace all thread events")                                        \
1014                                                                             \
1015   develop(bool, TraceBytecodes, false,                                      \
1016           "Trace bytecode execution")                                       \
1017                                                                             \
1018   develop(bool, TraceClassInitialization, false,                            \
1019           "Trace class initialization")                                     \
1020                                                                             \
1021   develop(bool, TraceExceptions, false,                                     \
1022           "Trace exceptions")                                               \
1023                                                                             \
1024   develop(bool, TraceICs, false,                                            \
1025           "Trace inline cache changes")                                     \
1026                                                                             \
1027   notproduct(bool, TraceInvocationCounterOverflow, false,                   \
1028           "Trace method invocation counter overflow")                       \
1029                                                                             \
1030   develop(bool, TraceInlineCacheClearing, false,                            \
1031           "Trace clearing of inline caches in nmethods")                    \
1032                                                                             \
1033   develop(bool, TraceDependencies, false,                                   \
1034           "Trace dependencies")                                             \
1035                                                                             \
1036   develop(bool, VerifyDependencies, trueInDebug,                            \
1037          "Exercise and verify the compilation dependency mechanism")        \
1038                                                                             \
1039   develop(bool, TraceNewOopMapGeneration, false,                            \
1040           "Trace OopMapGeneration")                                         \
1041                                                                             \
1042   develop(bool, TraceNewOopMapGenerationDetailed, false,                    \
1043           "Trace OopMapGeneration: print detailed cell states")             \
1044                                                                             \
1045   develop(bool, TimeOopMap, false,                                          \
1046           "Time calls to GenerateOopMap::compute_map() in sum")             \
1047                                                                             \
1048   develop(bool, TimeOopMap2, false,                                         \
1049           "Time calls to GenerateOopMap::compute_map() individually")       \
1050                                                                             \
1051   develop(bool, TraceMonitorMismatch, false,                                \
1052           "Trace monitor matching failures during OopMapGeneration")        \
1053                                                                             \
1054   develop(bool, TraceOopMapRewrites, false,                                 \
1055           "Trace rewritting of method oops during oop map generation")      \
1056                                                                             \
1057   develop(bool, TraceSafepoint, false,                                      \
1058           "Trace safepoint operations")                                     \
1059                                                                             \
1060   develop(bool, TraceICBuffer, false,                                       \
1061           "Trace usage of IC buffer")                                       \
1062                                                                             \
1063   develop(bool, TraceCompiledIC, false,                                     \
1064           "Trace changes of compiled IC")                                   \
1065                                                                             \
1066   notproduct(bool, TraceZapDeadLocals, false,                               \
1067           "Trace zapping dead locals")                                      \
1068                                                                             \
1069   develop(bool, TraceStartupTime, false,                                    \
1070           "Trace setup time")                                               \
1071                                                                             \
1072   develop(bool, TraceHPI, false,                                            \
1073           "Trace Host Porting Interface (HPI)")                             \
1074                                                                             \
1075   product(ccstr, HPILibPath, NULL,                                          \
1076           "Specify alternate path to HPI library")                          \
1077                                                                             \
1078   develop(bool, TraceProtectionDomainVerification, false,                   \
1079           "Trace protection domain verifcation")                            \
1080                                                                             \
1081   develop(bool, TraceClearedExceptions, false,                              \
1082           "Prints when an exception is forcibly cleared")                   \
1083                                                                             \
1084   product(bool, TraceClassResolution, false,                                \
1085           "Trace all constant pool resolutions (for debugging)")            \
1086                                                                             \
1087   product(bool, TraceBiasedLocking, false,                                  \
1088           "Trace biased locking in JVM")                                    \
1089                                                                             \
1090   product(bool, TraceMonitorInflation, false,                               \
1091           "Trace monitor inflation in JVM")                                 \
1092                                                                             \
1093   /* assembler */                                                           \
1094   product(bool, Use486InstrsOnly, false,                                    \
1095           "Use 80486 Compliant instruction subset")                         \
1096                                                                             \
1097   /* gc */                                                                  \
1098                                                                             \
1099   product(bool, UseSerialGC, false,                                         \
1100           "Tells whether the VM should use serial garbage collector")       \
1101                                                                             \
1102   product(bool, UseParallelGC, false,                                       \
1103           "Use the Parallel Scavenge garbage collector")                    \
1104                                                                             \
1105   product(bool, UseParallelOldGC, false,                                    \
1106           "Use the Parallel Old garbage collector")                         \
1107                                                                             \
1108   product(bool, UseParallelOldGCCompacting, true,                           \
1109           "In the Parallel Old garbage collector use parallel compaction")  \
1110                                                                             \
1111   product(bool, UseParallelDensePrefixUpdate, true,                         \
1112           "In the Parallel Old garbage collector use parallel dense"        \
1113           " prefix update")                                                 \
1114                                                                             \
1115   develop(bool, UseParallelOldGCChunkPointerCalc, true,                     \
1116           "In the Parallel Old garbage collector use chucks to calculate"   \
1117           " new object locations")                                          \
1118                                                                             \
1119   product(uintx, HeapMaximumCompactionInterval, 20,                         \
1120           "How often should we maximally compact the heap (not allowing "   \
1121           "any dead space)")                                                \
1122                                                                             \
1123   product(uintx, HeapFirstMaximumCompactionCount, 3,                        \
1124           "The collection count for the first maximum compaction")          \
1125                                                                             \
1126   product(bool, UseMaximumCompactionOnSystemGC, true,                       \
1127           "In the Parallel Old garbage collector maximum compaction for "   \
1128           "a system GC")                                                    \
1129                                                                             \
1130   product(uintx, ParallelOldDeadWoodLimiterMean, 50,                        \
1131           "The mean used by the par compact dead wood"                      \
1132           "limiter (a number between 0-100).")                              \
1133                                                                             \
1134   product(uintx, ParallelOldDeadWoodLimiterStdDev, 80,                      \
1135           "The standard deviation used by the par compact dead wood"        \
1136           "limiter (a number between 0-100).")                              \
1137                                                                             \
1138   product(bool, UseParallelOldGCDensePrefix, true,                          \
1139           "Use a dense prefix with the Parallel Old garbage collector")     \
1140                                                                             \
1141   product(uintx, ParallelGCThreads, 0,                                      \
1142           "Number of parallel threads parallel gc will use")                \
1143                                                                             \
1144   product(uintx, ParallelCMSThreads, 0,                                     \
1145           "Max number of threads CMS will use for concurrent work")         \
1146                                                                             \
1147   develop(bool, VerifyParallelOldWithMarkSweep, false,                      \
1148           "Use the MarkSweep code to verify phases of Parallel Old")        \
1149                                                                             \
1150   develop(uintx, VerifyParallelOldWithMarkSweepInterval, 1,                 \
1151           "Interval at which the MarkSweep code is used to verify "         \
1152           "phases of Parallel Old")                                         \
1153                                                                             \
1154   develop(bool, ParallelOldMTUnsafeMarkBitMap, false,                       \
1155           "Use the Parallel Old MT unsafe in marking the bitmap")           \
1156                                                                             \
1157   develop(bool, ParallelOldMTUnsafeUpdateLiveData, false,                   \
1158           "Use the Parallel Old MT unsafe in update of live size")          \
1159                                                                             \
1160   develop(bool, TraceChunkTasksQueuing, false,                              \
1161           "Trace the queuing of the chunk tasks")                           \
1162                                                                             \
1163   product(uintx, YoungPLABSize, 4096,                                       \
1164           "Size of young gen promotion labs (in HeapWords)")                \
1165                                                                             \
1166   product(uintx, OldPLABSize, 1024,                                         \
1167           "Size of old gen promotion labs (in HeapWords)")                  \
1168                                                                             \
1169   product(uintx, GCTaskTimeStampEntries, 200,                               \
1170           "Number of time stamp entries per gc worker thread")              \
1171                                                                             \
1172   product(bool, AlwaysTenure, false,                                        \
1173           "Always tenure objects in eden. (ParallelGC only)")               \
1174                                                                             \
1175   product(bool, NeverTenure, false,                                         \
1176           "Never tenure objects in eden, May tenure on overflow"            \
1177           " (ParallelGC only)")                                             \
1178                                                                             \
1179   product(bool, ScavengeBeforeFullGC, true,                                 \
1180           "Scavenge youngest generation before each full GC,"               \
1181           " used with UseParallelGC")                                       \
1182                                                                             \
1183   develop(bool, ScavengeWithObjectsInToSpace, false,                        \
1184           "Allow scavenges to occur when to_space contains objects.")       \
1185                                                                             \
1186   product(bool, UseConcMarkSweepGC, false,                                  \
1187           "Use Concurrent Mark-Sweep GC in the old generation")             \
1188                                                                             \
1189   product(bool, ExplicitGCInvokesConcurrent, false,                         \
1190           "A System.gc() request invokes a concurrent collection;"          \
1191           " (effective only when UseConcMarkSweepGC)")                      \
1192                                                                             \
1193   product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false,        \
1194           "A System.gc() request invokes a concurrent collection and"       \
1195           " also unloads classes during such a concurrent gc cycle  "       \
1196           " (effective only when UseConcMarkSweepGC)")                      \
1197                                                                             \
1198   develop(bool, UseCMSAdaptiveFreeLists, true,                              \
1199           "Use Adaptive Free Lists in the CMS generation")                  \
1200                                                                             \
1201   develop(bool, UseAsyncConcMarkSweepGC, true,                              \
1202           "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\
1203                                                                             \
1204   develop(bool, RotateCMSCollectionTypes, false,                            \
1205           "Rotate the CMS collections among concurrent and STW")            \
1206                                                                             \
1207   product(bool, UseCMSBestFit, true,                                        \
1208           "Use CMS best fit allocation strategy")                           \
1209                                                                             \
1210   product(bool, UseCMSCollectionPassing, true,                              \
1211           "Use passing of collection from background to foreground")        \
1212                                                                             \
1213   product(bool, UseParNewGC, false,                                         \
1214           "Use parallel threads in the new generation.")                    \
1215                                                                             \
1216   product(bool, ParallelGCVerbose, false,                                   \
1217           "Verbose output for parallel GC.")                                \
1218                                                                             \
1219   product(intx, ParallelGCBufferWastePct, 10,                               \
1220           "wasted fraction of parallel allocation buffer.")                 \
1221                                                                             \
1222   product(bool, ParallelGCRetainPLAB, true,                                 \
1223           "Retain parallel allocation buffers across scavenges.")           \
1224                                                                             \
1225   product(intx, TargetPLABWastePct, 10,                                     \
1226           "target wasted space in last buffer as pct of overall allocation")\
1227                                                                             \
1228   product(uintx, PLABWeight, 75,                                            \
1229           "Percentage (0-100) used to weight the current sample when"       \
1230           "computing exponentially decaying average for ResizePLAB.")       \
1231                                                                             \
1232   product(bool, ResizePLAB, true,                                           \
1233           "Dynamically resize (survivor space) promotion labs")             \
1234                                                                             \
1235   product(bool, PrintPLAB, false,                                           \
1236           "Print (survivor space) promotion labs sizing decisions")         \
1237                                                                             \
1238   product(intx, ParGCArrayScanChunk, 50,                                    \
1239           "Scan a subset and push remainder, if array is bigger than this") \
1240                                                                             \
1241   product(intx, ParGCDesiredObjsFromOverflowList, 20,                       \
1242           "The desired number of objects to claim from the overflow list")  \
1243                                                                             \
1244   product(uintx, CMSParPromoteBlocksToClaim, 50,                            \
1245           "Number of blocks to attempt to claim when refilling CMS LAB for "\
1246           "parallel GC.")                                                   \
1247                                                                             \
1248   product(bool, AlwaysPreTouch, false,                                      \
1249           "It forces all freshly committed pages to be pre-touched.")       \
1250                                                                             \
1251   product(bool, CMSUseOldDefaults, false,                                   \
1252           "A flag temporarily  introduced to allow reverting to some older" \
1253           "default settings; older as of 6.0 ")                             \
1254                                                                             \
1255   product(intx, CMSYoungGenPerWorker, 16*M,                                 \
1256           "The amount of young gen chosen by default per GC worker "        \
1257           "thread available ")                                              \
1258                                                                             \
1259   product(bool, CMSIncrementalMode, false,                                  \
1260           "Whether CMS GC should operate in \"incremental\" mode")          \
1261                                                                             \
1262   product(uintx, CMSIncrementalDutyCycle, 10,                               \
1263           "CMS incremental mode duty cycle (a percentage, 0-100).  If"      \
1264           "CMSIncrementalPacing is enabled, then this is just the initial"  \
1265           "value")                                                          \
1266                                                                             \
1267   product(bool, CMSIncrementalPacing, true,                                 \
1268           "Whether the CMS incremental mode duty cycle should be "          \
1269           "automatically adjusted")                                         \
1270                                                                             \
1271   product(uintx, CMSIncrementalDutyCycleMin, 0,                             \
1272           "Lower bound on the duty cycle when CMSIncrementalPacing is"      \
1273           "enabled (a percentage, 0-100).")                                 \
1274                                                                             \
1275   product(uintx, CMSIncrementalSafetyFactor, 10,                            \
1276           "Percentage (0-100) used to add conservatism when computing the"  \
1277           "duty cycle.")                                                    \
1278                                                                             \
1279   product(uintx, CMSIncrementalOffset, 0,                                   \
1280           "Percentage (0-100) by which the CMS incremental mode duty cycle" \
1281           "is shifted to the right within the period between young GCs")    \
1282                                                                             \
1283   product(uintx, CMSExpAvgFactor, 25,                                       \
1284           "Percentage (0-100) used to weight the current sample when"       \
1285           "computing exponential averages for CMS statistics.")             \
1286                                                                             \
1287   product(uintx, CMS_FLSWeight, 50,                                         \
1288           "Percentage (0-100) used to weight the current sample when"       \
1289           "computing exponentially decating averages for CMS FLS statistics.") \
1290                                                                             \
1291   product(uintx, CMS_FLSPadding, 2,                                         \
1292           "The multiple of deviation from mean to use for buffering"        \
1293           "against volatility in free list demand.")                        \
1294                                                                             \
1295   product(uintx, FLSCoalescePolicy, 2,                                      \
1296           "CMS: Aggression level for coalescing, increasing from 0 to 4")   \
1297                                                                             \
1298   product(uintx, CMS_SweepWeight, 50,                                       \
1299           "Percentage (0-100) used to weight the current sample when"       \
1300           "computing exponentially decaying average for inter-sweep duration.") \
1301                                                                             \
1302   product(uintx, CMS_SweepPadding, 2,                                       \
1303           "The multiple of deviation from mean to use for buffering"        \
1304           "against volatility in inter-sweep duration.")                    \
1305                                                                             \
1306   product(uintx, CMS_SweepTimerThresholdMillis, 10,                         \
1307           "Skip block flux-rate sampling for an epoch unless inter-sweep "  \
1308           " duration exceeds this threhold in milliseconds")                \
1309                                                                             \
1310   develop(bool, CMSTraceIncrementalMode, false,                             \
1311           "Trace CMS incremental mode")                                     \
1312                                                                             \
1313   develop(bool, CMSTraceIncrementalPacing, false,                           \
1314           "Trace CMS incremental mode pacing computation")                  \
1315                                                                             \
1316   develop(bool, CMSTraceThreadState, false,                                 \
1317           "Trace the CMS thread state (enable the trace_state() method)")   \
1318                                                                             \
1319   product(bool, CMSClassUnloadingEnabled, false,                            \
1320           "Whether class unloading enabled when using CMS GC")              \
1321                                                                             \
1322   product(bool, CMSCompactWhenClearAllSoftRefs, true,                       \
1323           "Compact when asked to collect CMS gen with clear_all_soft_refs") \
1324                                                                             \
1325   product(bool, UseCMSCompactAtFullCollection, true,                        \
1326           "Use mark sweep compact at full collections")                     \
1327                                                                             \
1328   product(uintx, CMSFullGCsBeforeCompaction, 0,                             \
1329           "Number of CMS full collection done before compaction if > 0")    \
1330                                                                             \
1331   develop(intx, CMSDictionaryChoice, 0,                                     \
1332           "Use BinaryTreeDictionary as default in the CMS generation")      \
1333                                                                             \
1334   product(uintx, CMSIndexedFreeListReplenish, 4,                            \
1335           "Replenish and indexed free list with this number of chunks")     \
1336                                                                             \
1337   product(bool, CMSLoopWarn, false,                                         \
1338           "Warn in case of excessive CMS looping")                          \
1339                                                                             \
1340   develop(bool, CMSOverflowEarlyRestoration, false,                         \
1341           "Whether preserved marks should be restored early")               \
1342                                                                             \
1343   product(uintx, CMSMarkStackSize, 32*K,                                    \
1344           "Size of CMS marking stack")                                      \
1345                                                                             \
1346   product(uintx, CMSMarkStackSizeMax, 4*M,                                  \
1347           "Max size of CMS marking stack")                                  \
1348                                                                             \
1349   notproduct(bool, CMSMarkStackOverflowALot, false,                         \
1350           "Whether we should simulate frequent marking stack / work queue"  \
1351           " overflow")                                                      \
1352                                                                             \
1353   notproduct(intx, CMSMarkStackOverflowInterval, 1000,                      \
1354           "A per-thread `interval' counter that determines how frequently"  \
1355           " we simulate overflow; a smaller number increases frequency")    \
1356                                                                             \
1357   product(uintx, CMSMaxAbortablePrecleanLoops, 0,                           \
1358           "(Temporary, subject to experimentation)"                         \
1359           "Maximum number of abortable preclean iterations, if > 0")        \
1360                                                                             \
1361   product(intx, CMSMaxAbortablePrecleanTime, 5000,                          \
1362           "(Temporary, subject to experimentation)"                         \
1363           "Maximum time in abortable preclean in ms")                       \
1364                                                                             \
1365   product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100,              \
1366           "(Temporary, subject to experimentation)"                         \
1367           "Nominal minimum work per abortable preclean iteration")          \
1368                                                                             \
1369   product(intx, CMSAbortablePrecleanWaitMillis, 100,                        \
1370           "(Temporary, subject to experimentation)"                         \
1371           " Time that we sleep between iterations when not given"           \
1372           " enough work per iteration")                                     \
1373                                                                             \
1374   product(uintx, CMSRescanMultiple, 32,                                     \
1375           "Size (in cards) of CMS parallel rescan task")                    \
1376                                                                             \
1377   product(uintx, CMSConcMarkMultiple, 32,                                   \
1378           "Size (in cards) of CMS concurrent MT marking task")              \
1379                                                                             \
1380   product(uintx, CMSRevisitStackSize, 1*M,                                  \
1381           "Size of CMS KlassKlass revisit stack")                           \
1382                                                                             \
1383   product(bool, CMSAbortSemantics, false,                                   \
1384           "Whether abort-on-overflow semantics is implemented")             \
1385                                                                             \
1386   product(bool, CMSParallelRemarkEnabled, true,                             \
1387           "Whether parallel remark enabled (only if ParNewGC)")             \
1388                                                                             \
1389   product(bool, CMSParallelSurvivorRemarkEnabled, true,                     \
1390           "Whether parallel remark of survivor space"                       \
1391           " enabled (effective only if CMSParallelRemarkEnabled)")          \
1392                                                                             \
1393   product(bool, CMSPLABRecordAlways, true,                                  \
1394           "Whether to always record survivor space PLAB bdries"             \
1395           " (effective only if CMSParallelSurvivorRemarkEnabled)")          \
1396                                                                             \
1397   product(bool, CMSConcurrentMTEnabled, true,                               \
1398           "Whether multi-threaded concurrent work enabled (if ParNewGC)")   \
1399                                                                             \
1400   product(bool, CMSPermGenPrecleaningEnabled, true,                         \
1401           "Whether concurrent precleaning enabled in perm gen"              \
1402           " (effective only when CMSPrecleaningEnabled is true)")           \
1403                                                                             \
1404   product(bool, CMSPrecleaningEnabled, true,                                \
1405           "Whether concurrent precleaning enabled")                         \
1406                                                                             \
1407   product(uintx, CMSPrecleanIter, 3,                                        \
1408           "Maximum number of precleaning iteration passes")                 \
1409                                                                             \
1410   product(uintx, CMSPrecleanNumerator, 2,                                   \
1411           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1412           " ratio")                                                         \
1413                                                                             \
1414   product(uintx, CMSPrecleanDenominator, 3,                                 \
1415           "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence"  \
1416           " ratio")                                                         \
1417                                                                             \
1418   product(bool, CMSPrecleanRefLists1, true,                                 \
1419           "Preclean ref lists during (initial) preclean phase")             \
1420                                                                             \
1421   product(bool, CMSPrecleanRefLists2, false,                                \
1422           "Preclean ref lists during abortable preclean phase")             \
1423                                                                             \
1424   product(bool, CMSPrecleanSurvivors1, false,                               \
1425           "Preclean survivors during (initial) preclean phase")             \
1426                                                                             \
1427   product(bool, CMSPrecleanSurvivors2, true,                                \
1428           "Preclean survivors during abortable preclean phase")             \
1429                                                                             \
1430   product(uintx, CMSPrecleanThreshold, 1000,                                \
1431           "Don't re-iterate if #dirty cards less than this")                \
1432                                                                             \
1433   product(bool, CMSCleanOnEnter, true,                                      \
1434           "Clean-on-enter optimization for reducing number of dirty cards") \
1435                                                                             \
1436   product(uintx, CMSRemarkVerifyVariant, 1,                                 \
1437           "Choose variant (1,2) of verification following remark")          \
1438                                                                             \
1439   product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M,                   \
1440           "If Eden used is below this value, don't try to schedule remark") \
1441                                                                             \
1442   product(uintx, CMSScheduleRemarkEdenPenetration, 50,                      \
1443           "The Eden occupancy % at which to try and schedule remark pause") \
1444                                                                             \
1445   product(uintx, CMSScheduleRemarkSamplingRatio, 5,                         \
1446           "Start sampling Eden top at least before yg occupancy reaches"    \
1447           " 1/<ratio> of the size at which we plan to schedule remark")     \
1448                                                                             \
1449   product(uintx, CMSSamplingGrain, 16*K,                                    \
1450           "The minimum distance between eden samples for CMS (see above)")  \
1451                                                                             \
1452   product(bool, CMSScavengeBeforeRemark, false,                             \
1453           "Attempt scavenge before the CMS remark step")                    \
1454                                                                             \
1455   develop(bool, CMSTraceSweeper, false,                                     \
1456           "Trace some actions of the CMS sweeper")                          \
1457                                                                             \
1458   product(uintx, CMSWorkQueueDrainThreshold, 10,                            \
1459           "Don't drain below this size per parallel worker/thief")          \
1460                                                                             \
1461   product(intx, CMSWaitDuration, 2000,                                      \
1462           "Time in milliseconds that CMS thread waits for young GC")        \
1463                                                                             \
1464   product(bool, CMSYield, true,                                             \
1465           "Yield between steps of concurrent mark & sweep")                 \
1466                                                                             \
1467   product(uintx, CMSBitMapYieldQuantum, 10*M,                               \
1468           "Bitmap operations should process at most this many bits"         \
1469           "between yields")                                                 \
1470                                                                             \
1471   diagnostic(bool, FLSVerifyAllHeapReferences, false,                       \
1472           "Verify that all refs across the FLS boundary "                   \
1473           " are to valid objects")                                          \
1474                                                                             \
1475   diagnostic(bool, FLSVerifyLists, false,                                   \
1476           "Do lots of (expensive) FreeListSpace verification")              \
1477                                                                             \
1478   diagnostic(bool, FLSVerifyIndexTable, false,                              \
1479           "Do lots of (expensive) FLS index table verification")            \
1480                                                                             \
1481   develop(bool, FLSVerifyDictionary, false,                                 \
1482           "Do lots of (expensive) FLS dictionary verification")             \
1483                                                                             \
1484   develop(bool, VerifyBlockOffsetArray, false,                              \
1485           "Do (expensive!) block offset array verification")                \
1486                                                                             \
1487   product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug,           \
1488           "Maintain _unallocated_block in BlockOffsetArray"                 \
1489           " (currently applicable only to CMS collector)")                  \
1490                                                                             \
1491   develop(bool, TraceCMSState, false,                                       \
1492           "Trace the state of the CMS collection")                          \
1493                                                                             \
1494   product(intx, RefDiscoveryPolicy, 0,                                      \
1495           "Whether reference-based(0) or referent-based(1)")                \
1496                                                                             \
1497   product(bool, ParallelRefProcEnabled, false,                              \
1498           "Enable parallel reference processing whenever possible")         \
1499                                                                             \
1500   product(bool, ParallelRefProcBalancingEnabled, true,                      \
1501           "Enable balancing of reference processing queues")                \
1502                                                                             \
1503   product(intx, CMSTriggerRatio, 80,                                        \
1504           "Percentage of MinHeapFreeRatio in CMS generation that is "       \
1505           "  allocated before a CMS collection cycle commences")            \
1506                                                                             \
1507   product(intx, CMSBootstrapOccupancy, 50,                                  \
1508           "Percentage CMS generation occupancy at which to "                \
1509           " initiate CMS collection for bootstrapping collection stats")    \
1510                                                                             \
1511   product(intx, CMSInitiatingOccupancyFraction, -1,                         \
1512           "Percentage CMS generation occupancy to start a CMS collection "  \
1513           " cycle (A negative value means that CMSTirggerRatio is used)")   \
1514                                                                             \
1515   product(bool, UseCMSInitiatingOccupancyOnly, false,                       \
1516           "Only use occupancy as a crierion for starting a CMS collection") \
1517                                                                             \
1518   develop(bool, CMSTestInFreeList, false,                                   \
1519           "Check if the coalesced range is already in the "                 \
1520           "free lists as claimed.")                                         \
1521                                                                             \
1522   notproduct(bool, CMSVerifyReturnedBytes, false,                           \
1523           "Check that all the garbage collected was returned to the "       \
1524           "free lists.")                                                    \
1525                                                                             \
1526   notproduct(bool, ScavengeALot, false,                                     \
1527           "Force scavenge at every Nth exit from the runtime system "       \
1528           "(N=ScavengeALotInterval)")                                       \
1529                                                                             \
1530   develop(bool, FullGCALot, false,                                          \
1531           "Force full gc at every Nth exit from the runtime system "        \
1532           "(N=FullGCALotInterval)")                                         \
1533                                                                             \
1534   notproduct(bool, GCALotAtAllSafepoints, false,                            \
1535           "Enforce ScavengeALot/GCALot at all potential safepoints")        \
1536                                                                             \
1537   product(bool, HandlePromotionFailure, true,                               \
1538           "The youngest generation collection does not require"             \
1539           " a guarantee of full promotion of all live objects.")            \
1540                                                                             \
1541   notproduct(bool, PromotionFailureALot, false,                             \
1542           "Use promotion failure handling on every youngest generation "    \
1543           "collection")                                                     \
1544                                                                             \
1545   develop(uintx, PromotionFailureALotCount, 1000,                           \
1546           "Number of promotion failures occurring at ParGCAllocBuffer"      \
1547           "refill attempts (ParNew) or promotion attempts "                 \
1548           "(other young collectors) ")                                      \
1549                                                                             \
1550   develop(uintx, PromotionFailureALotInterval, 5,                           \
1551           "Total collections between promotion failures alot")              \
1552                                                                             \
1553   develop(intx, WorkStealingSleepMillis, 1,                                 \
1554           "Sleep time when sleep is used for yields")                       \
1555                                                                             \
1556   develop(uintx, WorkStealingYieldsBeforeSleep, 1000,                       \
1557           "Number of yields before a sleep is done during workstealing")    \
1558                                                                             \
1559   product(uintx, PreserveMarkStackSize, 40,                                 \
1560            "Size for stack used in promotion failure handling")             \
1561                                                                             \
1562   product_pd(bool, UseTLAB, "Use thread-local object allocation")           \
1563                                                                             \
1564   product_pd(bool, ResizeTLAB,                                              \
1565           "Dynamically resize tlab size for threads")                       \
1566                                                                             \
1567   product(bool, ZeroTLAB, false,                                            \
1568           "Zero out the newly created TLAB")                                \
1569                                                                             \
1570   product(bool, PrintTLAB, false,                                           \
1571           "Print various TLAB related information")                         \
1572                                                                             \
1573   product(bool, TLABStats, true,                                            \
1574           "Print various TLAB related information")                         \
1575                                                                             \
1576   product_pd(bool, NeverActAsServerClassMachine,                            \
1577           "Never act like a server-class machine")                          \
1578                                                                             \
1579   product(bool, AlwaysActAsServerClassMachine, false,                       \
1580           "Always act like a server-class machine")                         \
1581                                                                             \
1582   product_pd(uintx, DefaultMaxRAM,                                          \
1583           "Maximum real memory size for setting server class heap size")    \
1584                                                                             \
1585   product(uintx, DefaultMaxRAMFraction, 4,                                  \
1586           "Fraction (1/n) of real memory used for server class max heap")   \
1587                                                                             \
1588   product(uintx, DefaultInitialRAMFraction, 64,                             \
1589           "Fraction (1/n) of real memory used for server class initial heap")  \
1590                                                                             \
1591   product(bool, UseAutoGCSelectPolicy, false,                               \
1592           "Use automatic collection selection policy")                      \
1593                                                                             \
1594   product(uintx, AutoGCSelectPauseMillis, 5000,                             \
1595           "Automatic GC selection pause threshhold in ms")                  \
1596                                                                             \
1597   product(bool, UseAdaptiveSizePolicy, true,                                \
1598           "Use adaptive generation sizing policies")                        \
1599                                                                             \
1600   product(bool, UsePSAdaptiveSurvivorSizePolicy, true,                      \
1601           "Use adaptive survivor sizing policies")                          \
1602                                                                             \
1603   product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true,     \
1604           "Use adaptive young-old sizing policies at minor collections")    \
1605                                                                             \
1606   product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true,     \
1607           "Use adaptive young-old sizing policies at major collections")    \
1608                                                                             \
1609   product(bool, UseAdaptiveSizePolicyWithSystemGC, false,                   \
1610           "Use statistics from System.GC for adaptive size policy")         \
1611                                                                             \
1612   product(bool, UseAdaptiveGCBoundary, false,                               \
1613           "Allow young-old boundary to move")                               \
1614                                                                             \
1615   develop(bool, TraceAdaptiveGCBoundary, false,                             \
1616           "Trace young-old boundary moves")                                 \
1617                                                                             \
1618   develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1,             \
1619           "Resize the virtual spaces of the young or old generations")      \
1620                                                                             \
1621   product(uintx, AdaptiveSizeThroughPutPolicy, 0,                           \
1622           "Policy for changeing generation size for throughput goals")      \
1623                                                                             \
1624   product(uintx, AdaptiveSizePausePolicy, 0,                                \
1625           "Policy for changing generation size for pause goals")            \
1626                                                                             \
1627   develop(bool, PSAdjustTenuredGenForMinorPause, false,                     \
1628           "Adjust tenured generation to achive a minor pause goal")         \
1629                                                                             \
1630   develop(bool, PSAdjustYoungGenForMajorPause, false,                       \
1631           "Adjust young generation to achive a major pause goal")           \
1632                                                                             \
1633   product(uintx, AdaptiveSizePolicyInitializingSteps, 20,                   \
1634           "Number of steps where heuristics is used before data is used")   \
1635                                                                             \
1636   develop(uintx, AdaptiveSizePolicyReadyThreshold, 5,                       \
1637           "Number of collections before the adaptive sizing is started")    \
1638                                                                             \
1639   product(uintx, AdaptiveSizePolicyOutputInterval, 0,                       \
1640           "Collecton interval for printing information, zero => never")     \
1641                                                                             \
1642   product(bool, UseAdaptiveSizePolicyFootprintGoal, true,                   \
1643           "Use adaptive minimum footprint as a goal")                       \
1644                                                                             \
1645   product(uintx, AdaptiveSizePolicyWeight, 10,                              \
1646           "Weight given to exponential resizing, between 0 and 100")        \
1647                                                                             \
1648   product(uintx, AdaptiveTimeWeight,       25,                              \
1649           "Weight given to time in adaptive policy, between 0 and 100")     \
1650                                                                             \
1651   product(uintx, PausePadding, 1,                                           \
1652           "How much buffer to keep for pause time")                         \
1653                                                                             \
1654   product(uintx, PromotedPadding, 3,                                        \
1655           "How much buffer to keep for promotion failure")                  \
1656                                                                             \
1657   product(uintx, SurvivorPadding, 3,                                        \
1658           "How much buffer to keep for survivor overflow")                  \
1659                                                                             \
1660   product(uintx, AdaptivePermSizeWeight, 20,                                \
1661           "Weight for perm gen exponential resizing, between 0 and 100")    \
1662                                                                             \
1663   product(uintx, PermGenPadding, 3,                                         \
1664           "How much buffer to keep for perm gen sizing")                    \
1665                                                                             \
1666   product(uintx, ThresholdTolerance, 10,                                    \
1667           "Allowed collection cost difference between generations")         \
1668                                                                             \
1669   product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50,                \
1670           "If collection costs are within margin, reduce both by full delta") \
1671                                                                             \
1672   product(uintx, YoungGenerationSizeIncrement, 20,                          \
1673           "Adaptive size percentage change in young generation")            \
1674                                                                             \
1675   product(uintx, YoungGenerationSizeSupplement, 80,                         \
1676           "Supplement to YoungedGenerationSizeIncrement used at startup")   \
1677                                                                             \
1678   product(uintx, YoungGenerationSizeSupplementDecay, 8,                     \
1679           "Decay factor to YoungedGenerationSizeSupplement")                \
1680                                                                             \
1681   product(uintx, TenuredGenerationSizeIncrement, 20,                        \
1682           "Adaptive size percentage change in tenured generation")          \
1683                                                                             \
1684   product(uintx, TenuredGenerationSizeSupplement, 80,                       \
1685           "Supplement to TenuredGenerationSizeIncrement used at startup")   \
1686                                                                             \
1687   product(uintx, TenuredGenerationSizeSupplementDecay, 2,                   \
1688           "Decay factor to TenuredGenerationSizeIncrement")                 \
1689                                                                             \
1690   product(uintx, MaxGCPauseMillis, max_uintx,                               \
1691           "Adaptive size policy maximum GC pause time goal in msec")        \
1692                                                                             \
1693   product(uintx, MaxGCMinorPauseMillis, max_uintx,                          \
1694           "Adaptive size policy maximum GC minor pause time goal in msec")  \
1695                                                                             \
1696   product(uintx, GCTimeRatio, 99,                                           \
1697           "Adaptive size policy application time to GC time ratio")         \
1698                                                                             \
1699   product(uintx, AdaptiveSizeDecrementScaleFactor, 4,                       \
1700           "Adaptive size scale down factor for shrinking")                  \
1701                                                                             \
1702   product(bool, UseAdaptiveSizeDecayMajorGCCost, true,                      \
1703           "Adaptive size decays the major cost for long major intervals")   \
1704                                                                             \
1705   product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10,                     \
1706           "Time scale over which major costs decay")                        \
1707                                                                             \
1708   product(uintx, MinSurvivorRatio, 3,                                       \
1709           "Minimum ratio of young generation/survivor space size")          \
1710                                                                             \
1711   product(uintx, InitialSurvivorRatio, 8,                                   \
1712           "Initial ratio of eden/survivor space size")                      \
1713                                                                             \
1714   product(uintx, BaseFootPrintEstimate, 256*M,                              \
1715           "Estimate of footprint other than Java Heap")                     \
1716                                                                             \
1717   product(bool, UseGCOverheadLimit, true,                                   \
1718           "Use policy to limit of proportion of time spent in GC "          \
1719           "before an OutOfMemory error is thrown")                          \
1720                                                                             \
1721   product(uintx, GCTimeLimit, 98,                                           \
1722           "Limit of proportion of time spent in GC before an OutOfMemory"   \
1723           "error is thrown (used with GCHeapFreeLimit)")                    \
1724                                                                             \
1725   product(uintx, GCHeapFreeLimit, 2,                                        \
1726           "Minimum percentage of free space after a full GC before an "     \
1727           "OutOfMemoryError is thrown (used with GCTimeLimit)")             \
1728                                                                             \
1729   develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5,                 \
1730           "Number of consecutive collections before gc time limit fires")   \
1731                                                                             \
1732   product(bool, PrintAdaptiveSizePolicy, false,                             \
1733           "Print information about AdaptiveSizePolicy")                     \
1734                                                                             \
1735   product(intx, PrefetchCopyIntervalInBytes, -1,                            \
1736           "How far ahead to prefetch destination area (<= 0 means off)")    \
1737                                                                             \
1738   product(intx, PrefetchScanIntervalInBytes, -1,                            \
1739           "How far ahead to prefetch scan area (<= 0 means off)")           \
1740                                                                             \
1741   product(intx, PrefetchFieldsAhead, -1,                                    \
1742           "How many fields ahead to prefetch in oop scan (<= 0 means off)") \
1743                                                                             \
1744   develop(bool, UsePrefetchQueue, true,                                     \
1745           "Use the prefetch queue during PS promotion")                     \
1746                                                                             \
1747   diagnostic(bool, VerifyBeforeExit, trueInDebug,                           \
1748           "Verify system before exiting")                                   \
1749                                                                             \
1750   diagnostic(bool, VerifyBeforeGC, false,                                   \
1751           "Verify memory system before GC")                                 \
1752                                                                             \
1753   diagnostic(bool, VerifyAfterGC, false,                                    \
1754           "Verify memory system after GC")                                  \
1755                                                                             \
1756   diagnostic(bool, VerifyDuringGC, false,                                   \
1757           "Verify memory system during GC (between phases)")                \
1758                                                                             \
1759   diagnostic(bool, VerifyRememberedSets, false,                             \
1760           "Verify GC remembered sets")                                      \
1761                                                                             \
1762   diagnostic(bool, VerifyObjectStartArray, true,                            \
1763           "Verify GC object start array if verify before/after")            \
1764                                                                             \
1765   product(bool, DisableExplicitGC, false,                                   \
1766           "Tells whether calling System.gc() does a full GC")               \
1767                                                                             \
1768   notproduct(bool, CheckMemoryInitialization, false,                        \
1769           "Checks memory initialization")                                   \
1770                                                                             \
1771   product(bool, CollectGen0First, false,                                    \
1772           "Collect youngest generation before each full GC")                \
1773                                                                             \
1774   diagnostic(bool, BindCMSThreadToCPU, false,                               \
1775           "Bind CMS Thread to CPU if possible")                             \
1776                                                                             \
1777   diagnostic(uintx, CPUForCMSThread, 0,                                     \
1778           "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \
1779                                                                             \
1780   product(bool, BindGCTaskThreadsToCPUs, false,                             \
1781           "Bind GCTaskThreads to CPUs if possible")                         \
1782                                                                             \
1783   product(bool, UseGCTaskAffinity, false,                                   \
1784           "Use worker affinity when asking for GCTasks")                    \
1785                                                                             \
1786   product(uintx, ProcessDistributionStride, 4,                              \
1787           "Stride through processors when distributing processes")          \
1788                                                                             \
1789   product(uintx, CMSCoordinatorYieldSleepCount, 10,                         \
1790           "number of times the coordinator GC thread will sleep while "     \
1791           "yielding before giving up and resuming GC")                      \
1792                                                                             \
1793   product(uintx, CMSYieldSleepCount, 0,                                     \
1794           "number of times a GC thread (minus the coordinator) "            \
1795           "will sleep while yielding before giving up and resuming GC")     \
1796                                                                             \
1797   /* gc tracing */                                                          \
1798   manageable(bool, PrintGC, false,                                          \
1799           "Print message at garbage collect")                               \
1800                                                                             \
1801   manageable(bool, PrintGCDetails, false,                                   \
1802           "Print more details at garbage collect")                          \
1803                                                                             \
1804   manageable(bool, PrintGCDateStamps, false,                                \
1805           "Print date stamps at garbage collect")                           \
1806                                                                             \
1807   manageable(bool, PrintGCTimeStamps, false,                                \
1808           "Print timestamps at garbage collect")                            \
1809                                                                             \
1810   product(bool, PrintGCTaskTimeStamps, false,                               \
1811           "Print timestamps for individual gc worker thread tasks")         \
1812                                                                             \
1813   develop(intx, ConcGCYieldTimeout, 0,                                      \
1814           "If non-zero, assert that GC threads yield within this # of ms.") \
1815                                                                             \
1816   notproduct(bool, TraceMarkSweep, false,                                   \
1817           "Trace mark sweep")                                               \
1818                                                                             \
1819   product(bool, PrintReferenceGC, false,                                    \
1820           "Print times spent handling reference objects during GC "         \
1821           " (enabled only when PrintGCDetails)")                            \
1822                                                                             \
1823   develop(bool, TraceReferenceGC, false,                                    \
1824           "Trace handling of soft/weak/final/phantom references")           \
1825                                                                             \
1826   develop(bool, TraceFinalizerRegistration, false,                          \
1827          "Trace registration of final references")                          \
1828                                                                             \
1829   notproduct(bool, TraceScavenge, false,                                    \
1830           "Trace scavenge")                                                 \
1831                                                                             \
1832   product_rw(bool, TraceClassLoading, false,                                \
1833           "Trace all classes loaded")                                       \
1834                                                                             \
1835   product(bool, TraceClassLoadingPreorder, false,                           \
1836           "Trace all classes loaded in order referenced (not loaded)")      \
1837                                                                             \
1838   product_rw(bool, TraceClassUnloading, false,                              \
1839           "Trace unloading of classes")                                     \
1840                                                                             \
1841   product_rw(bool, TraceLoaderConstraints, false,                           \
1842           "Trace loader constraints")                                       \
1843                                                                             \
1844   product(bool, TraceGen0Time, false,                                       \
1845           "Trace accumulated time for Gen 0 collection")                    \
1846                                                                             \
1847   product(bool, TraceGen1Time, false,                                       \
1848           "Trace accumulated time for Gen 1 collection")                    \
1849                                                                             \
1850   product(bool, PrintTenuringDistribution, false,                           \
1851           "Print tenuring age information")                                 \
1852                                                                             \
1853   product_rw(bool, PrintHeapAtGC, false,                                    \
1854           "Print heap layout before and after each GC")                     \
1855                                                                             \
1856   product(bool, PrintHeapAtSIGBREAK, true,                                  \
1857           "Print heap layout in response to SIGBREAK")                      \
1858                                                                             \
1859   manageable(bool, PrintClassHistogram, false,                              \
1860           "Print a histogram of class instances")                           \
1861                                                                             \
1862   develop(bool, TraceWorkGang, false,                                       \
1863           "Trace activities of work gangs")                                 \
1864                                                                             \
1865   product(bool, TraceParallelOldGCTasks, false,                             \
1866           "Trace multithreaded GC activity")                                \
1867                                                                             \
1868   develop(bool, TraceBlockOffsetTable, false,                               \
1869           "Print BlockOffsetTable maps")                                    \
1870                                                                             \
1871   develop(bool, TraceCardTableModRefBS, false,                              \
1872           "Print CardTableModRefBS maps")                                   \
1873                                                                             \
1874   develop(bool, TraceGCTaskManager, false,                                  \
1875           "Trace actions of the GC task manager")                           \
1876                                                                             \
1877   develop(bool, TraceGCTaskQueue, false,                                    \
1878           "Trace actions of the GC task queues")                            \
1879                                                                             \
1880   develop(bool, TraceGCTaskThread, false,                                   \
1881           "Trace actions of the GC task threads")                           \
1882                                                                             \
1883   product(bool, PrintParallelOldGCPhaseTimes, false,                        \
1884           "Print the time taken by each parallel old gc phase."             \
1885           "PrintGCDetails must also be enabled.")                           \
1886                                                                             \
1887   develop(bool, TraceParallelOldGCMarkingPhase, false,                      \
1888           "Trace parallel old gc marking phase")                            \
1889                                                                             \
1890   develop(bool, TraceParallelOldGCSummaryPhase, false,                      \
1891           "Trace parallel old gc summary phase")                            \
1892                                                                             \
1893   develop(bool, TraceParallelOldGCCompactionPhase, false,                   \
1894           "Trace parallel old gc compaction phase")                         \
1895                                                                             \
1896   develop(bool, TraceParallelOldGCDensePrefix, false,                       \
1897           "Trace parallel old gc dense prefix computation")                 \
1898                                                                             \
1899   develop(bool, IgnoreLibthreadGPFault, false,                              \
1900           "Suppress workaround for libthread GP fault")                     \
1901                                                                             \
1902   /* JVMTI heap profiling */                                                \
1903                                                                             \
1904   diagnostic(bool, TraceJVMTIObjectTagging, false,                          \
1905           "Trace JVMTI object tagging calls")                               \
1906                                                                             \
1907   diagnostic(bool, VerifyBeforeIteration, false,                            \
1908           "Verify memory system before JVMTI iteration")                    \
1909                                                                             \
1910   /* compiler interface */                                                  \
1911                                                                             \
1912   develop(bool, CIPrintCompilerName, false,                                 \
1913           "when CIPrint is active, print the name of the active compiler")  \
1914                                                                             \
1915   develop(bool, CIPrintCompileQueue, false,                                 \
1916           "display the contents of the compile queue whenever a "           \
1917           "compilation is enqueued")                                        \
1918                                                                             \
1919   develop(bool, CIPrintRequests, false,                                     \
1920           "display every request for compilation")                          \
1921                                                                             \
1922   product(bool, CITime, false,                                              \
1923           "collect timing information for compilation")                     \
1924                                                                             \
1925   develop(bool, CITimeEach, false,                                          \
1926           "display timing information after each successful compilation")   \
1927                                                                             \
1928   develop(bool, CICountOSR, true,                                           \
1929           "use a separate counter when assigning ids to osr compilations")  \
1930                                                                             \
1931   develop(bool, CICompileNatives, true,                                     \
1932           "compile native methods if supported by the compiler")            \
1933                                                                             \
1934   develop_pd(bool, CICompileOSR,                                            \
1935           "compile on stack replacement methods if supported by the "       \
1936           "compiler")                                                       \
1937                                                                             \
1938   develop(bool, CIPrintMethodCodes, false,                                  \
1939           "print method bytecodes of the compiled code")                    \
1940                                                                             \
1941   develop(bool, CIPrintTypeFlow, false,                                     \
1942           "print the results of ciTypeFlow analysis")                       \
1943                                                                             \
1944   develop(bool, CITraceTypeFlow, false,                                     \
1945           "detailed per-bytecode tracing of ciTypeFlow analysis")           \
1946                                                                             \
1947   develop(intx, CICloneLoopTestLimit, 100,                                  \
1948           "size limit for blocks heuristically cloned in ciTypeFlow")       \
1949                                                                             \
1950   /* temp diagnostics */                                                    \
1951                                                                             \
1952   diagnostic(bool, TraceRedundantCompiles, false,                           \
1953           "Have compile broker print when a request already in the queue is"\
1954           " requested again")                                               \
1955                                                                             \
1956   diagnostic(bool, InitialCompileFast, false,                               \
1957           "Initial compile at CompLevel_fast_compile")                      \
1958                                                                             \
1959   diagnostic(bool, InitialCompileReallyFast, false,                         \
1960           "Initial compile at CompLevel_really_fast_compile (no profile)")  \
1961                                                                             \
1962   diagnostic(bool, FullProfileOnReInterpret, true,                          \
1963           "On re-interpret unc-trap compile next at CompLevel_fast_compile")\
1964                                                                             \
1965   /* compiler */                                                            \
1966                                                                             \
1967   product(intx, CICompilerCount, CI_COMPILER_COUNT,                         \
1968           "Number of compiler threads to run")                              \
1969                                                                             \
1970   product(intx, CompilationPolicyChoice, 0,                                 \
1971           "which compilation policy (0/1)")                                 \
1972                                                                             \
1973   develop(bool, UseStackBanging, true,                                      \
1974           "use stack banging for stack overflow checks (required for "      \
1975           "proper StackOverflow handling; disable only to measure cost "    \
1976           "of stackbanging)")                                               \
1977                                                                             \
1978   develop(bool, Use24BitFPMode, true,                                       \
1979           "Set 24-bit FPU mode on a per-compile basis ")                    \
1980                                                                             \
1981   develop(bool, Use24BitFP, true,                                           \
1982           "use FP instructions that produce 24-bit precise results")        \
1983                                                                             \
1984   develop(bool, UseStrictFP, true,                                          \
1985           "use strict fp if modifier strictfp is set")                      \
1986                                                                             \
1987   develop(bool, GenerateSynchronizationCode, true,                          \
1988           "generate locking/unlocking code for synchronized methods and "   \
1989           "monitors")                                                       \
1990                                                                             \
1991   develop(bool, GenerateCompilerNullChecks, true,                           \
1992           "Generate explicit null checks for loads/stores/calls")           \
1993                                                                             \
1994   develop(bool, GenerateRangeChecks, true,                                  \
1995           "Generate range checks for array accesses")                       \
1996                                                                             \
1997   develop_pd(bool, ImplicitNullChecks,                                      \
1998           "generate code for implicit null checks")                         \
1999                                                                             \
2000   product(bool, PrintSafepointStatistics, false,                            \
2001           "print statistics about safepoint synchronization")               \
2002                                                                             \
2003   product(intx, PrintSafepointStatisticsCount, 300,                         \
2004           "total number of safepoint statistics collected "                 \
2005           "before printing them out")                                       \
2006                                                                             \
2007   product(intx, PrintSafepointStatisticsTimeout,  -1,                       \
2008           "print safepoint statistics only when safepoint takes"            \
2009           " more than PrintSafepointSatisticsTimeout in millis")            \
2010                                                                             \
2011   develop(bool, InlineAccessors, true,                                      \
2012           "inline accessor methods (get/set)")                              \
2013                                                                             \
2014   product(bool, Inline, true,                                               \
2015           "enable inlining")                                                \
2016                                                                             \
2017   product(bool, ClipInlining, true,                                         \
2018           "clip inlining if aggregate method exceeds DesiredMethodLimit")   \
2019                                                                             \
2020   develop(bool, UseCHA, true,                                               \
2021           "enable CHA")                                                     \
2022                                                                             \
2023   product(bool, UseTypeProfile, true,                                       \
2024           "Check interpreter profile for historically monomorphic calls")   \
2025                                                                             \
2026   product(intx, TypeProfileMajorReceiverPercent, 90,                        \
2027           "% of major receiver type to all profiled receivers")             \
2028                                                                             \
2029   notproduct(bool, TimeCompiler, false,                                     \
2030           "time the compiler")                                              \
2031                                                                             \
2032   notproduct(bool, TimeCompiler2, false,                                    \
2033           "detailed time the compiler (requires +TimeCompiler)")            \
2034                                                                             \
2035   diagnostic(bool, PrintInlining, false,                                    \
2036           "prints inlining optimizations")                                  \
2037                                                                             \
2038   diagnostic(bool, PrintIntrinsics, false,                                  \
2039           "prints attempted and successful inlining of intrinsics")         \
2040                                                                             \
2041   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
2042           "do not expand intrinsics whose (internal) names appear here")    \
2043                                                                             \
2044   develop(bool, StressReflectiveCode, false,                                \
2045           "Use inexact types at allocations, etc., to test reflection")     \
2046                                                                             \
2047   develop(bool, EagerInitialization, false,                                 \
2048           "Eagerly initialize classes if possible")                         \
2049                                                                             \
2050   product(bool, Tier1UpdateMethodData, trueInTiered,                        \
2051           "Update methodDataOops in Tier1-generated code")                  \
2052                                                                             \
2053   develop(bool, TraceMethodReplacement, false,                              \
2054           "Print when methods are replaced do to recompilation")            \
2055                                                                             \
2056   develop(bool, PrintMethodFlushing, false,                                 \
2057           "print the nmethods being flushed")                               \
2058                                                                             \
2059   notproduct(bool, LogMultipleMutexLocking, false,                          \
2060           "log locking and unlocking of mutexes (only if multiple locks "   \
2061           "are held)")                                                      \
2062                                                                             \
2063   develop(bool, UseRelocIndex, false,                                       \
2064          "use an index to speed random access to relocations")              \
2065                                                                             \
2066   develop(bool, StressCodeBuffers, false,                                   \
2067          "Exercise code buffer expansion and other rare state changes")     \
2068                                                                             \
2069   diagnostic(bool, DebugNonSafepoints, trueInDebug,                         \
2070          "Generate extra debugging info for non-safepoints in nmethods")    \
2071                                                                             \
2072   diagnostic(bool, DebugInlinedCalls, true,                                 \
2073          "If false, restricts profiled locations to the root method only")  \
2074                                                                             \
2075   product(bool, PrintVMOptions, trueInDebug,                                \
2076          "print VM flag settings")                                          \
2077                                                                             \
2078   diagnostic(bool, SerializeVMOutput, true,                                 \
2079          "Use a mutex to serialize output to tty and hotspot.log")          \
2080                                                                             \
2081   diagnostic(bool, DisplayVMOutput, true,                                   \
2082          "Display all VM output on the tty, independently of LogVMOutput")  \
2083                                                                             \
2084   diagnostic(bool, LogVMOutput, trueInDebug,                                \
2085          "Save VM output to hotspot.log, or to LogFile")                    \
2086                                                                             \
2087   diagnostic(ccstr, LogFile, NULL,                                          \
2088          "If LogVMOutput is on, save VM output to this file [hotspot.log]") \
2089                                                                             \
2090   product(ccstr, ErrorFile, NULL,                                           \
2091          "If an error occurs, save the error data to this file "            \
2092          "[default: ./hs_err_pid%p.log] (%p replaced with pid)")            \
2093                                                                             \
2094   product(bool, DisplayVMOutputToStderr, false,                             \
2095          "If DisplayVMOutput is true, display all VM output to stderr")     \
2096                                                                             \
2097   product(bool, DisplayVMOutputToStdout, false,                             \
2098          "If DisplayVMOutput is true, display all VM output to stdout")     \
2099                                                                             \
2100   product(bool, UseHeavyMonitors, false,                                    \
2101           "use heavyweight instead of lightweight Java monitors")           \
2102                                                                             \
2103   notproduct(bool, PrintSymbolTableSizeHistogram, false,                    \
2104           "print histogram of the symbol table")                            \
2105                                                                             \
2106   notproduct(bool, ExitVMOnVerifyError, false,                              \
2107           "standard exit from VM if bytecode verify error "                 \
2108           "(only in debug mode)")                                           \
2109                                                                             \
2110   notproduct(ccstr, AbortVMOnException, NULL,                               \
2111           "Call fatal if this exception is thrown.  Example: "              \
2112           "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \
2113                                                                             \
2114   develop(bool, DebugVtables, false,                                        \
2115           "add debugging code to vtable dispatch")                          \
2116                                                                             \
2117   develop(bool, PrintVtables, false,                                        \
2118           "print vtables when printing klass")                              \
2119                                                                             \
2120   notproduct(bool, PrintVtableStats, false,                                 \
2121           "print vtables stats at end of run")                              \
2122                                                                             \
2123   develop(bool, TraceCreateZombies, false,                                  \
2124           "trace creation of zombie nmethods")                              \
2125                                                                             \
2126   notproduct(bool, IgnoreLockingAssertions, false,                          \
2127           "disable locking assertions (for speed)")                         \
2128                                                                             \
2129   notproduct(bool, VerifyLoopOptimizations, false,                          \
2130           "verify major loop optimizations")                                \
2131                                                                             \
2132   product(bool, RangeCheckElimination, true,                                \
2133           "Split loop iterations to eliminate range checks")                \
2134                                                                             \
2135   develop_pd(bool, UncommonNullCast,                                        \
2136           "track occurrences of null in casts; adjust compiler tactics")    \
2137                                                                             \
2138   develop(bool, TypeProfileCasts,  true,                                    \
2139           "treat casts like calls for purposes of type profiling")          \
2140                                                                             \
2141   develop(bool, MonomorphicArrayCheck, true,                                \
2142           "Uncommon-trap array store checks that require full type check")  \
2143                                                                             \
2144   develop(bool, DelayCompilationDuringStartup, true,                        \
2145           "Delay invoking the compiler until main application class is "    \
2146           "loaded")                                                         \
2147                                                                             \
2148   develop(bool, CompileTheWorld, false,                                     \
2149           "Compile all methods in all classes in bootstrap class path "     \
2150           "(stress test)")                                                  \
2151                                                                             \
2152   develop(bool, CompileTheWorldPreloadClasses, true,                        \
2153           "Preload all classes used by a class before start loading")       \
2154                                                                             \
2155   notproduct(bool, CompileTheWorldIgnoreInitErrors, false,                  \
2156           "Compile all methods although class initializer failed")          \
2157                                                                             \
2158   develop(bool, TraceIterativeGVN, false,                                   \
2159           "Print progress during Iterative Global Value Numbering")         \
2160                                                                             \
2161   develop(bool, FillDelaySlots, true,                                       \
2162           "Fill delay slots (on SPARC only)")                               \
2163                                                                             \
2164   develop(bool, VerifyIterativeGVN, false,                                  \
2165           "Verify Def-Use modifications during sparse Iterative Global "    \
2166           "Value Numbering")                                                \
2167                                                                             \
2168   notproduct(bool, TracePhaseCCP, false,                                    \
2169           "Print progress during Conditional Constant Propagation")         \
2170                                                                             \
2171   develop(bool, TimeLivenessAnalysis, false,                                \
2172           "Time computation of bytecode liveness analysis")                 \
2173                                                                             \
2174   develop(bool, TraceLivenessGen, false,                                    \
2175           "Trace the generation of liveness analysis information")          \
2176                                                                             \
2177   notproduct(bool, TraceLivenessQuery, false,                               \
2178           "Trace queries of liveness analysis information")                 \
2179                                                                             \
2180   notproduct(bool, CollectIndexSetStatistics, false,                        \
2181           "Collect information about IndexSets")                            \
2182                                                                             \
2183   develop(bool, PrintDominators, false,                                     \
2184           "Print out dominator trees for GVN")                              \
2185                                                                             \
2186   develop(bool, UseLoopSafepoints, true,                                    \
2187           "Generate Safepoint nodes in every loop")                         \
2188                                                                             \
2189   notproduct(bool, TraceCISCSpill, false,                                   \
2190           "Trace allocators use of cisc spillable instructions")            \
2191                                                                             \
2192   notproduct(bool, TraceSpilling, false,                                    \
2193           "Trace spilling")                                                 \
2194                                                                             \
2195   develop(bool, DeutschShiffmanExceptions, true,                            \
2196           "Fast check to find exception handler for precisely typed "       \
2197           "exceptions")                                                     \
2198                                                                             \
2199   product(bool, SplitIfBlocks, true,                                        \
2200           "Clone compares and control flow through merge points to fold "   \
2201           "some branches")                                                  \
2202                                                                             \
2203   develop(intx, FastAllocateSizeLimit, 128*K,                               \
2204           /* Note:  This value is zero mod 1<<13 for a cheap sparc set. */  \
2205           "Inline allocations larger than this in doublewords must go slow")\
2206                                                                             \
2207   product(bool, AggressiveOpts, false,                                      \
2208           "Enable aggressive optimizations - see arguments.cpp")            \
2209                                                                             \
2210   /* statistics */                                                          \
2211   develop(bool, UseVTune, false,                                            \
2212           "enable support for Intel's VTune profiler")                      \
2213                                                                             \
2214   develop(bool, CountCompiledCalls, false,                                  \
2215           "counts method invocations")                                      \
2216                                                                             \
2217   notproduct(bool, CountRuntimeCalls, false,                                \
2218           "counts VM runtime calls")                                        \
2219                                                                             \
2220   develop(bool, CountJNICalls, false,                                       \
2221           "counts jni method invocations")                                  \
2222                                                                             \
2223   notproduct(bool, CountJVMCalls, false,                                    \
2224           "counts jvm method invocations")                                  \
2225                                                                             \
2226   notproduct(bool, CountRemovableExceptions, false,                         \
2227           "count exceptions that could be replaced by branches due to "     \
2228           "inlining")                                                       \
2229                                                                             \
2230   notproduct(bool, ICMissHistogram, false,                                  \
2231           "produce histogram of IC misses")                                 \
2232                                                                             \
2233   notproduct(bool, PrintClassStatistics, false,                             \
2234           "prints class statistics at end of run")                          \
2235                                                                             \
2236   notproduct(bool, PrintMethodStatistics, false,                            \
2237           "prints method statistics at end of run")                         \
2238                                                                             \
2239   /* interpreter */                                                         \
2240   develop(bool, ClearInterpreterLocals, false,                              \
2241           "Always clear local variables of interpreter activations upon "   \
2242           "entry")                                                          \
2243                                                                             \
2244   product_pd(bool, RewriteBytecodes,                                        \
2245           "Allow rewriting of bytecodes (bytecodes are not immutable)")     \
2246                                                                             \
2247   product_pd(bool, RewriteFrequentPairs,                                    \
2248           "Rewrite frequently used bytecode pairs into a single bytecode")  \
2249                                                                             \
2250   product(bool, PrintInterpreter, false,                                    \
2251           "Prints the generated interpreter code")                          \
2252                                                                             \
2253   product(bool, UseInterpreter, true,                                       \
2254           "Use interpreter for non-compiled methods")                       \
2255                                                                             \
2256   develop(bool, UseFastSignatureHandlers, true,                             \
2257           "Use fast signature handlers for native calls")                   \
2258                                                                             \
2259   develop(bool, UseV8InstrsOnly, false,                                     \
2260           "Use SPARC-V8 Compliant instruction subset")                      \
2261                                                                             \
2262   product(bool, UseNiagaraInstrs, false,                                    \
2263           "Use Niagara-efficient instruction subset")                       \
2264                                                                             \
2265   develop(bool, UseCASForSwap, false,                                       \
2266           "Do not use swap instructions, but only CAS (in a loop) on SPARC")\
2267                                                                             \
2268   product(bool, UseLoopCounter, true,                                       \
2269           "Increment invocation counter on backward branch")                \
2270                                                                             \
2271   product(bool, UseFastEmptyMethods, true,                                  \
2272           "Use fast method entry code for empty methods")                   \
2273                                                                             \
2274   product(bool, UseFastAccessorMethods, true,                               \
2275           "Use fast method entry code for accessor methods")                \
2276                                                                             \
2277   product_pd(bool, UseOnStackReplacement,                                   \
2278            "Use on stack replacement, calls runtime if invoc. counter "     \
2279            "overflows in loop")                                             \
2280                                                                             \
2281   notproduct(bool, TraceOnStackReplacement, false,                          \
2282           "Trace on stack replacement")                                     \
2283                                                                             \
2284   develop(bool, PoisonOSREntry, true,                                       \
2285            "Detect abnormal calls to OSR code")                             \
2286                                                                             \
2287   product_pd(bool, PreferInterpreterNativeStubs,                            \
2288           "Use always interpreter stubs for native methods invoked via "    \
2289           "interpreter")                                                    \
2290                                                                             \
2291   develop(bool, CountBytecodes, false,                                      \
2292           "Count number of bytecodes executed")                             \
2293                                                                             \
2294   develop(bool, PrintBytecodeHistogram, false,                              \
2295           "Print histogram of the executed bytecodes")                      \
2296                                                                             \
2297   develop(bool, PrintBytecodePairHistogram, false,                          \
2298           "Print histogram of the executed bytecode pairs")                 \
2299                                                                             \
2300   develop(bool, PrintSignatureHandlers, false,                              \
2301           "Print code generated for native method signature handlers")      \
2302                                                                             \
2303   develop(bool, VerifyOops, false,                                          \
2304           "Do plausibility checks for oops")                                \
2305                                                                             \
2306   develop(bool, CheckUnhandledOops, false,                                  \
2307           "Check for unhandled oops in VM code")                            \
2308                                                                             \
2309   develop(bool, VerifyJNIFields, trueInDebug,                               \
2310           "Verify jfieldIDs for instance fields")                           \
2311                                                                             \
2312   notproduct(bool, VerifyJNIEnvThread, false,                               \
2313           "Verify JNIEnv.thread == Thread::current() when entering VM "     \
2314           "from JNI")                                                       \
2315                                                                             \
2316   develop(bool, VerifyFPU, false,                                           \
2317           "Verify FPU state (check for NaN's, etc.)")                       \
2318                                                                             \
2319   develop(bool, VerifyThread, false,                                        \
2320           "Watch the thread register for corruption (SPARC only)")          \
2321                                                                             \
2322   develop(bool, VerifyActivationFrameSize, false,                           \
2323           "Verify that activation frame didn't become smaller than its "    \
2324           "minimal size")                                                   \
2325                                                                             \
2326   develop(bool, TraceFrequencyInlining, false,                              \
2327           "Trace frequency based inlining")                                 \
2328                                                                             \
2329   notproduct(bool, TraceTypeProfile, false,                                 \
2330           "Trace type profile")                                             \
2331                                                                             \
2332   develop_pd(bool, InlineIntrinsics,                                        \
2333            "Inline intrinsics that can be statically resolved")             \
2334                                                                             \
2335   product_pd(bool, ProfileInterpreter,                                      \
2336            "Profile at the bytecode level during interpretation")           \
2337                                                                             \
2338   develop_pd(bool, ProfileTraps,                                            \
2339           "Profile deoptimization traps at the bytecode level")             \
2340                                                                             \
2341   product(intx, ProfileMaturityPercentage, 20,                              \
2342           "number of method invocations/branches (expressed as % of "       \
2343           "CompileThreshold) before using the method's profile")            \
2344                                                                             \
2345   develop(bool, PrintMethodData, false,                                     \
2346            "Print the results of +ProfileInterpreter at end of run")        \
2347                                                                             \
2348   develop(bool, VerifyDataPointer, trueInDebug,                             \
2349           "Verify the method data pointer during interpreter profiling")    \
2350                                                                             \
2351   develop(bool, VerifyCompiledCode, false,                                  \
2352           "Include miscellaneous runtime verifications in nmethod code; "   \
2353           "off by default because it disturbs nmethod size heuristics.")    \
2354                                                                             \
2355                                                                             \
2356   /* compilation */                                                         \
2357   product(bool, UseCompiler, true,                                          \
2358           "use compilation")                                                \
2359                                                                             \
2360   develop(bool, TraceCompilationPolicy, false,                              \
2361           "Trace compilation policy")                                       \
2362                                                                             \
2363   develop(bool, TimeCompilationPolicy, false,                               \
2364           "Time the compilation policy")                                    \
2365                                                                             \
2366   product(bool, UseCounterDecay, true,                                      \
2367            "adjust recompilation counters")                                 \
2368                                                                             \
2369   develop(intx, CounterHalfLifeTime,    30,                                 \
2370           "half-life time of invocation counters (in secs)")                \
2371                                                                             \
2372   develop(intx, CounterDecayMinIntervalLength,   500,                       \
2373           "Min. ms. between invocation of CounterDecay")                    \
2374                                                                             \
2375   product(bool, AlwaysCompileLoopMethods, false,                            \
2376           "when using recompilation, never interpret methods "              \
2377           "containing loops")                                               \
2378                                                                             \
2379   product(bool, DontCompileHugeMethods, true,                               \
2380           "don't compile methods > HugeMethodLimit")                        \
2381                                                                             \
2382   /* Bytecode escape analysis estimation. */                                \
2383   product(bool, EstimateArgEscape, true,                                    \
2384           "Analyze bytecodes to estimate escape state of arguments")        \
2385                                                                             \
2386   product(intx, BCEATraceLevel, 0,                                          \
2387           "How much tracing to do of bytecode escape analysis estimates")   \
2388                                                                             \
2389   product(intx, MaxBCEAEstimateLevel, 5,                                    \
2390           "Maximum number of nested calls that are analyzed by BC EA.")     \
2391                                                                             \
2392   product(intx, MaxBCEAEstimateSize, 150,                                   \
2393           "Maximum bytecode size of a method to be analyzed by BC EA.")     \
2394                                                                             \
2395   product(intx,  AllocatePrefetchStyle, 1,                                  \
2396           "0 = no prefetch, "                                               \
2397           "1 = prefetch instructions for each allocation, "                 \
2398           "2 = use TLAB watermark to gate allocation prefetch")             \
2399                                                                             \
2400   product(intx,  AllocatePrefetchDistance, -1,                              \
2401           "Distance to prefetch ahead of allocation pointer")               \
2402                                                                             \
2403   product(intx,  AllocatePrefetchLines, 1,                                  \
2404           "Number of lines to prefetch ahead of allocation pointer")        \
2405                                                                             \
2406   product(intx,  AllocatePrefetchStepSize, 16,                              \
2407           "Step size in bytes of sequential prefetch instructions")         \
2408                                                                             \
2409   product(intx,  AllocatePrefetchInstr, 0,                                  \
2410           "Prefetch instruction to prefetch ahead of allocation pointer")   \
2411                                                                             \
2412   product(intx,  ReadPrefetchInstr, 0,                                      \
2413           "Prefetch instruction to prefetch ahead")                         \
2414                                                                             \
2415   /* deoptimization */                                                      \
2416   develop(bool, TraceDeoptimization, false,                                 \
2417           "Trace deoptimization")                                           \
2418                                                                             \
2419   develop(bool, DebugDeoptimization, false,                                 \
2420           "Tracing various information while debugging deoptimization")     \
2421                                                                             \
2422   product(intx, SelfDestructTimer, 0,                                       \
2423           "Will cause VM to terminate after a given time (in minutes) "     \
2424           "(0 means off)")                                                  \
2425                                                                             \
2426   product(intx, MaxJavaStackTraceDepth, 1024,                               \
2427           "Max. no. of lines in the stack trace for Java exceptions "       \
2428           "(0 means all)")                                                  \
2429                                                                             \
2430   develop(intx, GuaranteedSafepointInterval, 1000,                          \
2431           "Guarantee a safepoint (at least) every so many milliseconds "    \
2432           "(0 means none)")                                                 \
2433                                                                             \
2434   product(intx, SafepointTimeoutDelay, 10000,                               \
2435           "Delay in milliseconds for option SafepointTimeout")              \
2436                                                                             \
2437   product(intx, NmethodSweepFraction, 4,                                    \
2438           "Number of invocations of sweeper to cover all nmethods")         \
2439                                                                             \
2440   notproduct(intx, MemProfilingInterval, 500,                               \
2441           "Time between each invocation of the MemProfiler")                \
2442                                                                             \
2443   develop(intx, MallocCatchPtr, -1,                                         \
2444           "Hit breakpoint when mallocing/freeing this pointer")             \
2445                                                                             \
2446   notproduct(intx, AssertRepeat, 1,                                         \
2447           "number of times to evaluate expression in assert "               \
2448           "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \
2449                                                                             \
2450   notproduct(ccstrlist, SuppressErrorAt, "",                                \
2451           "List of assertions (file:line) to muzzle")                       \
2452                                                                             \
2453   notproduct(uintx, HandleAllocationLimit, 1024,                            \
2454           "Threshold for HandleMark allocation when +TraceHandleAllocation "\
2455           "is used")                                                        \
2456                                                                             \
2457   develop(uintx, TotalHandleAllocationLimit, 1024,                          \
2458           "Threshold for total handle allocation when "                     \
2459           "+TraceHandleAllocation is used")                                 \
2460                                                                             \
2461   develop(intx, StackPrintLimit, 100,                                       \
2462           "number of stack frames to print in VM-level stack dump")         \
2463                                                                             \
2464   notproduct(intx, MaxElementPrintSize, 256,                                \
2465           "maximum number of elements to print")                            \
2466                                                                             \
2467   notproduct(intx, MaxSubklassPrintSize, 4,                                 \
2468           "maximum number of subklasses to print when printing klass")      \
2469                                                                             \
2470   develop(intx, MaxInlineLevel, 9,                                          \
2471           "maximum number of nested calls that are inlined")                \
2472                                                                             \
2473   develop(intx, MaxRecursiveInlineLevel, 1,                                 \
2474           "maximum number of nested recursive calls that are inlined")      \
2475                                                                             \
2476   develop(intx, InlineSmallCode, 1000,                                      \
2477           "Only inline already compiled methods if their code size is "     \
2478           "less than this")                                                 \
2479                                                                             \
2480   product(intx, MaxInlineSize, 35,                                          \
2481           "maximum bytecode size of a method to be inlined")                \
2482                                                                             \
2483   product_pd(intx, FreqInlineSize,                                          \
2484           "maximum bytecode size of a frequent method to be inlined")       \
2485                                                                             \
2486   develop(intx, MaxTrivialSize, 6,                                          \
2487           "maximum bytecode size of a trivial method to be inlined")        \
2488                                                                             \
2489   develop(intx, MinInliningThreshold, 250,                                  \
2490           "min. invocation count a method needs to have to be inlined")     \
2491                                                                             \
2492   develop(intx, AlignEntryCode, 4,                                          \
2493           "aligns entry code to specified value (in bytes)")                \
2494                                                                             \
2495   develop(intx, MethodHistogramCutoff, 100,                                 \
2496           "cutoff value for method invoc. histogram (+CountCalls)")         \
2497                                                                             \
2498   develop(intx, ProfilerNumberOfInterpretedMethods, 25,                     \
2499           "# of interpreted methods to show in profile")                    \
2500                                                                             \
2501   develop(intx, ProfilerNumberOfCompiledMethods, 25,                        \
2502           "# of compiled methods to show in profile")                       \
2503                                                                             \
2504   develop(intx, ProfilerNumberOfStubMethods, 25,                            \
2505           "# of stub methods to show in profile")                           \
2506                                                                             \
2507   develop(intx, ProfilerNumberOfRuntimeStubNodes, 25,                       \
2508           "# of runtime stub nodes to show in profile")                     \
2509                                                                             \
2510   product(intx, ProfileIntervalsTicks, 100,                                 \
2511           "# of ticks between printing of interval profile "                \
2512           "(+ProfileIntervals)")                                            \
2513                                                                             \
2514   notproduct(intx, ScavengeALotInterval,     1,                             \
2515           "Interval between which scavenge will occur with +ScavengeALot")  \
2516                                                                             \
2517   notproduct(intx, FullGCALotInterval,     1,                               \
2518           "Interval between which full gc will occur with +FullGCALot")     \
2519                                                                             \
2520   notproduct(intx, FullGCALotStart,     0,                                  \
2521           "For which invocation to start FullGCAlot")                       \
2522                                                                             \
2523   notproduct(intx, FullGCALotDummies,  32*K,                                \
2524           "Dummy object allocated with +FullGCALot, forcing all objects "   \
2525           "to move")                                                        \
2526                                                                             \
2527   develop(intx, DontYieldALotInterval,    10,                               \
2528           "Interval between which yields will be dropped (milliseconds)")   \
2529                                                                             \
2530   develop(intx, MinSleepInterval,     1,                                    \
2531           "Minimum sleep() interval (milliseconds) when "                   \
2532           "ConvertSleepToYield is off (used for SOLARIS)")                  \
2533                                                                             \
2534   product(intx, EventLogLength,  2000,                                      \
2535           "maximum nof events in event log")                                \
2536                                                                             \
2537   develop(intx, ProfilerPCTickThreshold,    15,                             \
2538           "Number of ticks in a PC buckets to be a hotspot")                \
2539                                                                             \
2540   notproduct(intx, DeoptimizeALotInterval,     5,                           \
2541           "Number of exits until DeoptimizeALot kicks in")                  \
2542                                                                             \
2543   notproduct(intx, ZombieALotInterval,     5,                               \
2544           "Number of exits until ZombieALot kicks in")                      \
2545                                                                             \
2546   develop(bool, StressNonEntrant, false,                                    \
2547           "Mark nmethods non-entrant at registration")                      \
2548                                                                             \
2549   diagnostic(intx, MallocVerifyInterval,     0,                             \
2550           "if non-zero, verify C heap after every N calls to "              \
2551           "malloc/realloc/free")                                            \
2552                                                                             \
2553   diagnostic(intx, MallocVerifyStart,     0,                                \
2554           "if non-zero, start verifying C heap after Nth call to "          \
2555           "malloc/realloc/free")                                            \
2556                                                                             \
2557   product(intx, TypeProfileWidth,      2,                                   \
2558           "number of receiver types to record in call/cast profile")        \
2559                                                                             \
2560   develop(intx, BciProfileWidth,      2,                                    \
2561           "number of return bci's to record in ret profile")                \
2562                                                                             \
2563   product(intx, PerMethodRecompilationCutoff, 400,                          \
2564           "After recompiling N times, stay in the interpreter (-1=>'Inf')") \
2565                                                                             \
2566   product(intx, PerBytecodeRecompilationCutoff, 100,                        \
2567           "Per-BCI limit on repeated recompilation (-1=>'Inf')")            \
2568                                                                             \
2569   product(intx, PerMethodTrapLimit,  100,                                   \
2570           "Limit on traps (of one kind) in a method (includes inlines)")    \
2571                                                                             \
2572   product(intx, PerBytecodeTrapLimit,  4,                                   \
2573           "Limit on traps (of one kind) at a particular BCI")               \
2574                                                                             \
2575   develop(intx, FreqCountInvocations,  1,                                   \
2576           "Scaling factor for branch frequencies (deprecated)")             \
2577                                                                             \
2578   develop(intx, InlineFrequencyRatio,    20,                                \
2579           "Ratio of call site execution to caller method invocation")       \
2580                                                                             \
2581   develop_pd(intx, InlineFrequencyCount,                                    \
2582           "Count of call site execution necessary to trigger frequent "     \
2583           "inlining")                                                       \
2584                                                                             \
2585   develop(intx, InlineThrowCount,    50,                                    \
2586           "Force inlining of interpreted methods that throw this often")    \
2587                                                                             \
2588   develop(intx, InlineThrowMaxSize,   200,                                  \
2589           "Force inlining of throwing methods smaller than this")           \
2590                                                                             \
2591   product(intx, AliasLevel,     3,                                          \
2592           "0 for no aliasing, 1 for oop/field/static/array split, "         \
2593           "2 for class split, 3 for unique instances")                      \
2594                                                                             \
2595   develop(bool, VerifyAliases, false,                                       \
2596           "perform extra checks on the results of alias analysis")          \
2597                                                                             \
2598   develop(intx, ProfilerNodeSize,  1024,                                    \
2599           "Size in K to allocate for the Profile Nodes of each thread")     \
2600                                                                             \
2601   develop(intx, V8AtomicOperationUnderLockSpinCount,    50,                 \
2602           "Number of times to spin wait on a v8 atomic operation lock")     \
2603                                                                             \
2604   product(intx, ReadSpinIterations,   100,                                  \
2605           "Number of read attempts before a yield (spin inner loop)")       \
2606                                                                             \
2607   product_pd(intx, PreInflateSpin,                                          \
2608           "Number of times to spin wait before inflation")                  \
2609                                                                             \
2610   product(intx, PreBlockSpin,    10,                                        \
2611           "Number of times to spin in an inflated lock before going to "    \
2612           "an OS lock")                                                     \
2613                                                                             \
2614   /* gc parameters */                                                       \
2615   product(uintx, MaxHeapSize, ScaleForWordSize(64*M),                       \
2616           "Default maximum size for object heap (in bytes)")                \
2617                                                                             \
2618   product_pd(uintx, NewSize,                                                \
2619           "Default size of new generation (in bytes)")                      \
2620                                                                             \
2621   product(uintx, MaxNewSize, max_uintx,                                     \
2622           "Maximum size of new generation (in bytes)")                      \
2623                                                                             \
2624   product(uintx, PretenureSizeThreshold, 0,                                 \
2625           "Max size in bytes of objects allocated in DefNew generation")    \
2626                                                                             \
2627   product_pd(uintx, TLABSize,                                               \
2628           "Default (or starting) size of TLAB (in bytes)")                  \
2629                                                                             \
2630   product(uintx, MinTLABSize, 2*K,                                          \
2631           "Minimum allowed TLAB size (in bytes)")                           \
2632                                                                             \
2633   product(uintx, TLABAllocationWeight, 35,                                  \
2634           "Allocation averaging weight")                                    \
2635                                                                             \
2636   product(uintx, TLABWasteTargetPercent, 1,                                 \
2637           "Percentage of Eden that can be wasted")                          \
2638                                                                             \
2639   product(uintx, TLABRefillWasteFraction,    64,                            \
2640           "Max TLAB waste at a refill (internal fragmentation)")            \
2641                                                                             \
2642   product(uintx, TLABWasteIncrement,    4,                                  \
2643           "Increment allowed waste at slow allocation")                     \
2644                                                                             \
2645   product_pd(intx, SurvivorRatio,                                           \
2646           "Ratio of eden/survivor space size")                              \
2647                                                                             \
2648   product_pd(intx, NewRatio,                                                \
2649           "Ratio of new/old generation sizes")                              \
2650                                                                             \
2651   product(uintx, MaxLiveObjectEvacuationRatio, 100,                         \
2652           "Max percent of eden objects that will be live at scavenge")      \
2653                                                                             \
2654   product_pd(uintx, NewSizeThreadIncrease,                                  \
2655           "Additional size added to desired new generation size per "       \
2656           "non-daemon thread (in bytes)")                                   \
2657                                                                             \
2658   product(uintx, OldSize, ScaleForWordSize(4096*K),                         \
2659           "Default size of tenured generation (in bytes)")                  \
2660                                                                             \
2661   product_pd(uintx, PermSize,                                               \
2662           "Default size of permanent generation (in bytes)")                \
2663                                                                             \
2664   product_pd(uintx, MaxPermSize,                                            \
2665           "Maximum size of permanent generation (in bytes)")                \
2666                                                                             \
2667   product(uintx, MinHeapFreeRatio,    40,                                   \
2668           "Min percentage of heap free after GC to avoid expansion")        \
2669                                                                             \
2670   product(uintx, MaxHeapFreeRatio,    70,                                   \
2671           "Max percentage of heap free after GC to avoid shrinking")        \
2672                                                                             \
2673   product(intx, SoftRefLRUPolicyMSPerMB, 1000,                              \
2674           "Number of milliseconds per MB of free space in the heap")        \
2675                                                                             \
2676   product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K),                \
2677           "Min change in heap space due to GC (in bytes)")                  \
2678                                                                             \
2679   product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K),             \
2680           "Min expansion of permanent heap (in bytes)")                     \
2681                                                                             \
2682   product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M),               \
2683           "Max expansion of permanent heap without full GC (in bytes)")     \
2684                                                                             \
2685   product(intx, QueuedAllocationWarningCount, 0,                            \
2686           "Number of times an allocation that queues behind a GC "          \
2687           "will retry before printing a warning")                           \
2688                                                                             \
2689   diagnostic(uintx, VerifyGCStartAt,   0,                                   \
2690           "GC invoke count where +VerifyBefore/AfterGC kicks in")           \
2691                                                                             \
2692   diagnostic(intx, VerifyGCLevel,     0,                                    \
2693           "Generation level at which to start +VerifyBefore/AfterGC")       \
2694                                                                             \
2695   develop(uintx, ExitAfterGCNum,   0,                                       \
2696           "If non-zero, exit after this GC.")                               \
2697                                                                             \
2698   product(intx, MaxTenuringThreshold,    15,                                \
2699           "Maximum value for tenuring threshold")                           \
2700                                                                             \
2701   product(intx, InitialTenuringThreshold,     7,                            \
2702           "Initial value for tenuring threshold")                           \
2703                                                                             \
2704   product(intx, TargetSurvivorRatio,    50,                                 \
2705           "Desired percentage of survivor space used after scavenge")       \
2706                                                                             \
2707   product(intx, MarkSweepDeadRatio,     5,                                  \
2708           "Percentage (0-100) of the old gen allowed as dead wood."         \
2709           "Serial mark sweep treats this as both the min and max value."    \
2710           "CMS uses this value only if it falls back to mark sweep."        \
2711           "Par compact uses a variable scale based on the density of the"   \
2712           "generation and treats this as the max value when the heap is"    \
2713           "either completely full or completely empty.  Par compact also"   \
2714           "has a smaller default value; see arguments.cpp.")                \
2715                                                                             \
2716   product(intx, PermMarkSweepDeadRatio,    20,                              \
2717           "Percentage (0-100) of the perm gen allowed as dead wood."        \
2718           "See MarkSweepDeadRatio for collector-specific comments.")        \
2719                                                                             \
2720   product(intx, MarkSweepAlwaysCompactCount,     4,                         \
2721           "How often should we fully compact the heap (ignoring the dead "  \
2722           "space parameters)")                                              \
2723                                                                             \
2724   product(intx, PrintCMSStatistics, 0,                                      \
2725           "Statistics for CMS")                                             \
2726                                                                             \
2727   product(bool, PrintCMSInitiationStatistics, false,                        \
2728           "Statistics for initiating a CMS collection")                     \
2729                                                                             \
2730   product(intx, PrintFLSStatistics, 0,                                      \
2731           "Statistics for CMS' FreeListSpace")                              \
2732                                                                             \
2733   product(intx, PrintFLSCensus, 0,                                          \
2734           "Census for CMS' FreeListSpace")                                  \
2735                                                                             \
2736   develop(uintx, GCExpandToAllocateDelayMillis, 0,                          \
2737           "Delay in ms between expansion and allocation")                   \
2738                                                                             \
2739   product(intx, DeferThrSuspendLoopCount,     4000,                         \
2740           "(Unstable) Number of times to iterate in safepoint loop "        \
2741           " before blocking VM threads ")                                   \
2742                                                                             \
2743   product(intx, DeferPollingPageLoopCount,     -1,                          \
2744           "(Unsafe,Unstable) Number of iterations in safepoint loop "       \
2745           "before changing safepoint polling page to RO ")                  \
2746                                                                             \
2747   product(intx, SafepointSpinBeforeYield, 2000,  "(Unstable)")              \
2748                                                                             \
2749   product(bool, UseDepthFirstScavengeOrder, true,                           \
2750           "true: the scavenge order will be depth-first, "                  \
2751           "false: the scavenge order will be breadth-first")                \
2752                                                                             \
2753   product(bool, PSChunkLargeArrays, true,                                   \
2754           "true: process large arrays in chunks")                           \
2755                                                                             \
2756   product(uintx, GCDrainStackTargetSize, 64,                                \
2757           "how many entries we'll try to leave on the stack during "        \
2758           "parallel GC")                                                    \
2759                                                                             \
2760   /* stack parameters */                                                    \
2761   product_pd(intx, StackYellowPages,                                        \
2762           "Number of yellow zone (recoverable overflows) pages")            \
2763                                                                             \
2764   product_pd(intx, StackRedPages,                                           \
2765           "Number of red zone (unrecoverable overflows) pages")             \
2766                                                                             \
2767   product_pd(intx, StackShadowPages,                                        \
2768           "Number of shadow zone (for overflow checking) pages"             \
2769           " this should exceed the depth of the VM and native call stack")  \
2770                                                                             \
2771   product_pd(intx, ThreadStackSize,                                         \
2772           "Thread Stack Size (in Kbytes)")                                  \
2773                                                                             \
2774   product_pd(intx, VMThreadStackSize,                                       \
2775           "Non-Java Thread Stack Size (in Kbytes)")                         \
2776                                                                             \
2777   product_pd(intx, CompilerThreadStackSize,                                 \
2778           "Compiler Thread Stack Size (in Kbytes)")                         \
2779                                                                             \
2780   develop_pd(uintx, JVMInvokeMethodSlack,                                   \
2781           "Stack space (bytes) required for JVM_InvokeMethod to complete")  \
2782                                                                             \
2783   product(uintx, ThreadSafetyMargin, 50*M,                                  \
2784           "Thread safety margin is used on fixed-stack LinuxThreads (on "   \
2785           "Linux/x86 only) to prevent heap-stack collision. Set to 0 to "   \
2786           "disable this feature")                                           \
2787                                                                             \
2788   /* code cache parameters */                                               \
2789   develop(uintx, CodeCacheSegmentSize, 64,                                  \
2790           "Code cache segment size (in bytes) - smallest unit of "          \
2791           "allocation")                                                     \
2792                                                                             \
2793   develop_pd(intx, CodeEntryAlignment,                                      \
2794           "Code entry alignment for generated code (in bytes)")             \
2795                                                                             \
2796   product_pd(uintx, InitialCodeCacheSize,                                   \
2797           "Initial code cache size (in bytes)")                             \
2798                                                                             \
2799   product_pd(uintx, ReservedCodeCacheSize,                                  \
2800           "Reserved code cache size (in bytes) - maximum code cache size")  \
2801                                                                             \
2802   product(uintx, CodeCacheMinimumFreeSpace, 500*K,                          \
2803           "When less than X space left, we stop compiling.")                \
2804                                                                             \
2805   product_pd(uintx, CodeCacheExpansionSize,                                 \
2806           "Code cache expansion size (in bytes)")                           \
2807                                                                             \
2808   develop_pd(uintx, CodeCacheMinBlockLength,                                \
2809           "Minimum number of segments in a code cache block.")              \
2810                                                                             \
2811   notproduct(bool, ExitOnFullCodeCache, false,                              \
2812           "Exit the VM if we fill the code cache.")                         \
2813                                                                             \
2814   /* interpreter debugging */                                               \
2815   develop(intx, BinarySwitchThreshold, 5,                                   \
2816           "Minimal number of lookupswitch entries for rewriting to binary " \
2817           "switch")                                                         \
2818                                                                             \
2819   develop(intx, StopInterpreterAt, 0,                                       \
2820           "Stops interpreter execution at specified bytecode number")       \
2821                                                                             \
2822   develop(intx, TraceBytecodesAt, 0,                                        \
2823           "Traces bytecodes starting with specified bytecode number")       \
2824                                                                             \
2825   /* compiler interface */                                                  \
2826   develop(intx, CIStart, 0,                                                 \
2827           "the id of the first compilation to permit")                      \
2828                                                                             \
2829   develop(intx, CIStop,    -1,                                              \
2830           "the id of the last compilation to permit")                       \
2831                                                                             \
2832   develop(intx, CIStartOSR,     0,                                          \
2833           "the id of the first osr compilation to permit "                  \
2834           "(CICountOSR must be on)")                                        \
2835                                                                             \
2836   develop(intx, CIStopOSR,    -1,                                           \
2837           "the id of the last osr compilation to permit "                   \
2838           "(CICountOSR must be on)")                                        \
2839                                                                             \
2840   develop(intx, CIBreakAtOSR,    -1,                                        \
2841           "id of osr compilation to break at")                              \
2842                                                                             \
2843   develop(intx, CIBreakAt,    -1,                                           \
2844           "id of compilation to break at")                                  \
2845                                                                             \
2846   product(ccstrlist, CompileOnly, "",                                       \
2847           "List of methods (pkg/class.name) to restrict compilation to")    \
2848                                                                             \
2849   product(ccstr, CompileCommandFile, NULL,                                  \
2850           "Read compiler commands from this file [.hotspot_compiler]")      \
2851                                                                             \
2852   product(ccstrlist, CompileCommand, "",                                    \
2853           "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \
2854                                                                             \
2855   product(bool, CICompilerCountPerCPU, false,                               \
2856           "1 compiler thread for log(N CPUs)")                              \
2857                                                                             \
2858   develop(intx, CIFireOOMAt,    -1,                                         \
2859           "Fire OutOfMemoryErrors throughout CI for testing the compiler "  \
2860           "(non-negative value throws OOM after this many CI accesses "     \
2861           "in each compile)")                                               \
2862                                                                             \
2863   develop(intx, CIFireOOMAtDelay, -1,                                       \
2864           "Wait for this many CI accesses to occur in all compiles before " \
2865           "beginning to throw OutOfMemoryErrors in each compile")           \
2866                                                                             \
2867   /* Priorities */                                                          \
2868   product_pd(bool, UseThreadPriorities,  "Use native thread priorities")    \
2869                                                                             \
2870   product(intx, ThreadPriorityPolicy, 0,                                    \
2871           "0 : Normal.                                                     "\
2872           "    VM chooses priorities that are appropriate for normal       "\
2873           "    applications. On Solaris NORM_PRIORITY and above are mapped "\
2874           "    to normal native priority. Java priorities below NORM_PRIORITY"\
2875           "    map to lower native priority values. On Windows applications"\
2876           "    are allowed to use higher native priorities. However, with  "\
2877           "    ThreadPriorityPolicy=0, VM will not use the highest possible"\
2878           "    native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may   "\
2879           "    interfere with system threads. On Linux thread priorities   "\
2880           "    are ignored because the OS does not support static priority "\
2881           "    in SCHED_OTHER scheduling class which is the only choice for"\
2882           "    non-root, non-realtime applications.                        "\
2883           "1 : Aggressive.                                                 "\
2884           "    Java thread priorities map over to the entire range of      "\
2885           "    native thread priorities. Higher Java thread priorities map "\
2886           "    to higher native thread priorities. This policy should be   "\
2887           "    used with care, as sometimes it can cause performance       "\
2888           "    degradation in the application and/or the entire system. On "\
2889           "    Linux this policy requires root privilege.")                 \
2890                                                                             \
2891   product(bool, ThreadPriorityVerbose, false,                               \
2892           "print priority changes")                                         \
2893                                                                             \
2894   product(intx, DefaultThreadPriority, -1,                                  \
2895           "what native priority threads run at if not specified elsewhere (-1 means no change)") \
2896                                                                             \
2897   product(intx, CompilerThreadPriority, -1,                                 \
2898           "what priority should compiler threads run at (-1 means no change)") \
2899                                                                             \
2900   product(intx, VMThreadPriority, -1,                                       \
2901           "what priority should VM threads run at (-1 means no change)")    \
2902                                                                             \
2903   product(bool, CompilerThreadHintNoPreempt, true,                          \
2904           "(Solaris only) Give compiler threads an extra quanta")           \
2905                                                                             \
2906   product(bool, VMThreadHintNoPreempt, false,                               \
2907           "(Solaris only) Give VM thread an extra quanta")                  \
2908                                                                             \
2909   product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2910   product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2911   product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2912   product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2913   product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2914   product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2915   product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2916   product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2917   product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \
2918   product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \
2919                                                                             \
2920   /* compiler debugging */                                                  \
2921   notproduct(intx, CompileTheWorldStartAt,     1,                           \
2922           "First class to consider when using +CompileTheWorld")            \
2923                                                                             \
2924   notproduct(intx, CompileTheWorldStopAt, max_jint,                         \
2925           "Last class to consider when using +CompileTheWorld")             \
2926                                                                             \
2927   develop(intx, NewCodeParameter,      0,                                   \
2928           "Testing Only: Create a dedicated integer parameter before "      \
2929           "putback")                                                        \
2930                                                                             \
2931   /* new oopmap storage allocation */                                       \
2932   develop(intx, MinOopMapAllocation,     8,                                 \
2933           "Minimum number of OopMap entries in an OopMapSet")               \
2934                                                                             \
2935   /* Background Compilation */                                              \
2936   develop(intx, LongCompileThreshold,     50,                               \
2937           "Used with +TraceLongCompiles")                                   \
2938                                                                             \
2939   product(intx, StarvationMonitorInterval,    200,                          \
2940           "Pause between each check in ms")                                 \
2941                                                                             \
2942   /* recompilation */                                                       \
2943   product_pd(intx, CompileThreshold,                                        \
2944           "number of interpreted method invocations before (re-)compiling") \
2945                                                                             \
2946   product_pd(intx, BackEdgeThreshold,                                       \
2947           "Interpreter Back edge threshold at which an OSR compilation is invoked")\
2948                                                                             \
2949   product(intx, Tier1BytecodeLimit,      10,                                \
2950           "Must have at least this many bytecodes before tier1"             \
2951           "invocation counters are used")                                   \
2952                                                                             \
2953   product_pd(intx, Tier2CompileThreshold,                                   \
2954           "threshold at which a tier 2 compilation is invoked")             \
2955                                                                             \
2956   product_pd(intx, Tier2BackEdgeThreshold,                                  \
2957           "Back edge threshold at which a tier 2 compilation is invoked")   \
2958                                                                             \
2959   product_pd(intx, Tier3CompileThreshold,                                   \
2960           "threshold at which a tier 3 compilation is invoked")             \
2961                                                                             \
2962   product_pd(intx, Tier3BackEdgeThreshold,                                  \
2963           "Back edge threshold at which a tier 3 compilation is invoked")   \
2964                                                                             \
2965   product_pd(intx, Tier4CompileThreshold,                                   \
2966           "threshold at which a tier 4 compilation is invoked")             \
2967                                                                             \
2968   product_pd(intx, Tier4BackEdgeThreshold,                                  \
2969           "Back edge threshold at which a tier 4 compilation is invoked")   \
2970                                                                             \
2971   product_pd(bool, TieredCompilation,                                       \
2972           "Enable two-tier compilation")                                    \
2973                                                                             \
2974   product(bool, StressTieredRuntime, false,                                 \
2975           "Alternate client and server compiler on compile requests")       \
2976                                                                             \
2977   product_pd(intx, OnStackReplacePercentage,                                \
2978           "NON_TIERED number of method invocations/branches (expressed as %"\
2979           "of CompileThreshold) before (re-)compiling OSR code")            \
2980                                                                             \
2981   product(intx, InterpreterProfilePercentage, 33,                           \
2982           "NON_TIERED number of method invocations/branches (expressed as %"\
2983           "of CompileThreshold) before profiling in the interpreter")       \
2984                                                                             \
2985   develop(intx, MaxRecompilationSearchLength,    10,                        \
2986           "max. # frames to inspect searching for recompilee")              \
2987                                                                             \
2988   develop(intx, MaxInterpretedSearchLength,     3,                          \
2989           "max. # interp. frames to skip when searching for recompilee")    \
2990                                                                             \
2991   develop(intx, DesiredMethodLimit,  8000,                                  \
2992           "desired max. method size (in bytecodes) after inlining")         \
2993                                                                             \
2994   develop(intx, HugeMethodLimit,  8000,                                     \
2995           "don't compile methods larger than this if "                      \
2996           "+DontCompileHugeMethods")                                        \
2997                                                                             \
2998   /* New JDK 1.4 reflection implementation */                               \
2999                                                                             \
3000   develop(bool, UseNewReflection, true,                                     \
3001           "Temporary flag for transition to reflection based on dynamic "   \
3002           "bytecode generation in 1.4; can no longer be turned off in 1.4 " \
3003           "JDK, and is unneeded in 1.3 JDK, but marks most places VM "      \
3004           "changes were needed")                                            \
3005                                                                             \
3006   develop(bool, VerifyReflectionBytecodes, false,                           \
3007           "Force verification of 1.4 reflection bytecodes. Does not work "  \
3008           "in situations like that described in 4486457 or for "            \
3009           "constructors generated for serialization, so can not be enabled "\
3010           "in product.")                                                    \
3011                                                                             \
3012   product(bool, ReflectionWrapResolutionErrors, true,                       \
3013           "Temporary flag for transition to AbstractMethodError wrapped "   \
3014           "in InvocationTargetException. See 6531596")                      \
3015                                                                             \
3016                                                                             \
3017   develop(intx, FastSuperclassLimit, 8,                                     \
3018           "Depth of hardwired instanceof accelerator array")                \
3019                                                                             \
3020   /* Properties for Java libraries  */                                      \
3021                                                                             \
3022   product(intx, MaxDirectMemorySize, -1,                                    \
3023           "Maximum total size of NIO direct-buffer allocations")            \
3024                                                                             \
3025   /* temporary developer defined flags  */                                  \
3026                                                                             \
3027   diagnostic(bool, UseNewCode, false,                                       \
3028           "Testing Only: Use the new version while testing")                \
3029                                                                             \
3030   diagnostic(bool, UseNewCode2, false,                                      \
3031           "Testing Only: Use the new version while testing")                \
3032                                                                             \
3033   diagnostic(bool, UseNewCode3, false,                                      \
3034           "Testing Only: Use the new version while testing")                \
3035                                                                             \
3036   /* flags for performance data collection */                               \
3037                                                                             \
3038   product(bool, UsePerfData, true,                                          \
3039           "Flag to disable jvmstat instrumentation for performance testing" \
3040           "and problem isolation purposes.")                                \
3041                                                                             \
3042   product(bool, PerfDataSaveToFile, false,                                  \
3043           "Save PerfData memory to hsperfdata_<pid> file on exit")          \
3044                                                                             \
3045   product(ccstr, PerfDataSaveFile, NULL,                                    \
3046           "Save PerfData memory to the specified absolute pathname,"        \
3047            "%p in the file name if present will be replaced by pid")        \
3048                                                                             \
3049   product(intx, PerfDataSamplingInterval, 50 /*ms*/,                        \
3050           "Data sampling interval in milliseconds")                         \
3051                                                                             \
3052   develop(bool, PerfTraceDataCreation, false,                               \
3053           "Trace creation of Performance Data Entries")                     \
3054                                                                             \
3055   develop(bool, PerfTraceMemOps, false,                                     \
3056           "Trace PerfMemory create/attach/detach calls")                    \
3057                                                                             \
3058   product(bool, PerfDisableSharedMem, false,                                \
3059           "Store performance data in standard memory")                      \
3060                                                                             \
3061   product(intx, PerfDataMemorySize, 32*K,                                   \
3062           "Size of performance data memory region. Will be rounded "        \
3063           "up to a multiple of the native os page size.")                   \
3064                                                                             \
3065   product(intx, PerfMaxStringConstLength, 1024,                             \
3066           "Maximum PerfStringConstant string length before truncation")     \
3067                                                                             \
3068   product(bool, PerfAllowAtExitRegistration, false,                         \
3069           "Allow registration of atexit() methods")                         \
3070                                                                             \
3071   product(bool, PerfBypassFileSystemCheck, false,                           \
3072           "Bypass Win32 file system criteria checks (Windows Only)")        \
3073                                                                             \
3074   product(intx, UnguardOnExecutionViolation, 0,                             \
3075           "Unguard page and retry on no-execute fault (Win32 only)"         \
3076           "0=off, 1=conservative, 2=aggressive")                            \
3077                                                                             \
3078   /* Serviceability Support */                                              \
3079                                                                             \
3080   product(bool, ManagementServer, false,                                    \
3081           "Create JMX Management Server")                                   \
3082                                                                             \
3083   product(bool, DisableAttachMechanism, false,                              \
3084          "Disable mechanism that allows tools to attach to this VM")        \
3085                                                                             \
3086   product(bool, StartAttachListener, false,                                 \
3087           "Always start Attach Listener at VM startup")                     \
3088                                                                             \
3089   manageable(bool, PrintConcurrentLocks, false,                             \
3090           "Print java.util.concurrent locks in thread dump")                \
3091                                                                             \
3092   /* Shared spaces */                                                       \
3093                                                                             \
3094   product(bool, UseSharedSpaces, true,                                      \
3095           "Use shared spaces in the permanent generation")                  \
3096                                                                             \
3097   product(bool, RequireSharedSpaces, false,                                 \
3098           "Require shared spaces in the permanent generation")              \
3099                                                                             \
3100   product(bool, ForceSharedSpaces, false,                                   \
3101           "Require shared spaces in the permanent generation")              \
3102                                                                             \
3103   product(bool, DumpSharedSpaces, false,                                    \
3104            "Special mode: JVM reads a class list, loads classes, builds "   \
3105             "shared spaces, and dumps the shared spaces to a file to be "   \
3106             "used in future JVM runs.")                                     \
3107                                                                             \
3108   product(bool, PrintSharedSpaces, false,                                   \
3109           "Print usage of shared spaces")                                   \
3110                                                                             \
3111   product(uintx, SharedDummyBlockSize, 512*M,                               \
3112           "Size of dummy block used to shift heap addresses (in bytes)")    \
3113                                                                             \
3114   product(uintx, SharedReadWriteSize,  12*M,                                \
3115           "Size of read-write space in permanent generation (in bytes)")    \
3116                                                                             \
3117   product(uintx, SharedReadOnlySize,    8*M,                                \
3118           "Size of read-only space in permanent generation (in bytes)")     \
3119                                                                             \
3120   product(uintx, SharedMiscDataSize,    4*M,                                \
3121           "Size of the shared data area adjacent to the heap (in bytes)")   \
3122                                                                             \
3123   product(uintx, SharedMiscCodeSize,    4*M,                                \
3124           "Size of the shared code area adjacent to the heap (in bytes)")   \
3125                                                                             \
3126   diagnostic(bool, SharedOptimizeColdStart, true,                           \
3127           "At dump time, order shared objects to achieve better "           \
3128           "cold startup time.")                                             \
3129                                                                             \
3130   develop(intx, SharedOptimizeColdStartPolicy, 2,                           \
3131           "Reordering policy for SharedOptimizeColdStart "                  \
3132           "0=favor classload-time locality, 1=balanced, "                   \
3133           "2=favor runtime locality")                                       \
3134                                                                             \
3135   diagnostic(bool, SharedSkipVerify, false,                                 \
3136           "Skip assert() and verify() which page-in unwanted shared "       \
3137           "objects. ")                                                      \
3138                                                                             \
3139   product(bool, TaggedStackInterpreter, false,                              \
3140           "Insert tags in interpreter execution stack for oopmap generaion")\
3141                                                                             \
3142   diagnostic(bool, PauseAtStartup,      false,                              \
3143           "Causes the VM to pause at startup time and wait for the pause "  \
3144           "file to be removed (default: ./vm.paused.<pid>)")                \
3145                                                                             \
3146   diagnostic(ccstr, PauseAtStartupFile, NULL,                               \
3147           "The file to create and for whose removal to await when pausing " \
3148           "at startup. (default: ./vm.paused.<pid>)")                       \
3149                                                                             \
3150   product(bool, ExtendedDTraceProbes,    false,                             \
3151           "Enable performance-impacting dtrace probes")                     \
3152                                                                             \
3153   product(bool, DTraceMethodProbes, false,                                  \
3154           "Enable dtrace probes for method-entry and method-exit")          \
3155                                                                             \
3156   product(bool, DTraceAllocProbes, false,                                   \
3157           "Enable dtrace probes for object allocation")                     \
3158                                                                             \
3159   product(bool, DTraceMonitorProbes, false,                                 \
3160           "Enable dtrace probes for monitor events")                        \
3161                                                                             \
3162   product(bool, RelaxAccessControlCheck, false,                             \
3163           "Relax the access control checks in the verifier")                \
3164                                                                             \
3165   product(bool, UseVMInterruptibleIO, true,                                 \
3166           "(Unstable, Solaris-specific) Thread interrupt before or with "   \
3167           "EINTR for I/O operations results in OS_INTRPT")
3168 
3169 
3170 /*
3171  *  Macros for factoring of globals
3172  */
3173 
3174 // Interface macros
3175 #define DECLARE_PRODUCT_FLAG(type, name, value, doc)    extern "C" type name;
3176 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc)        extern "C" type name;
3177 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name;
3178 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name;
3179 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name;
3180 #ifdef PRODUCT
3181 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  const type name = value;
3182 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      const type name = pd_##name;
3183 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)
3184 #else
3185 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc)  extern "C" type name;
3186 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc)      extern "C" type name;
3187 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc)  extern "C" type name;
3188 #endif
3189 
3190 // Implementation macros
3191 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc)   type name = value;
3192 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc)       type name = pd_##name;
3193 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value;
3194 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value;
3195 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value;
3196 #ifdef PRODUCT
3197 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */
3198 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     /* flag name is constant */
3199 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc)
3200 #else
3201 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value;
3202 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc)     type name = pd_##name;
3203 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value;
3204 #endif
3205 
3206 RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG)
3207 
3208 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG)