globals.hpp revision 109:9f4457a14b58
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) 26define_pd_global(bool, BackgroundCompilation, false); 27define_pd_global(bool, UseTLAB, false); 28define_pd_global(bool, CICompileOSR, false); 29define_pd_global(bool, UseTypeProfile, false); 30define_pd_global(bool, UseOnStackReplacement, false); 31define_pd_global(bool, InlineIntrinsics, false); 32define_pd_global(bool, PreferInterpreterNativeStubs, true); 33define_pd_global(bool, ProfileInterpreter, false); 34define_pd_global(bool, ProfileTraps, false); 35define_pd_global(bool, TieredCompilation, false); 36 37define_pd_global(intx, CompileThreshold, 0); 38define_pd_global(intx, Tier2CompileThreshold, 0); 39define_pd_global(intx, Tier3CompileThreshold, 0); 40define_pd_global(intx, Tier4CompileThreshold, 0); 41 42define_pd_global(intx, BackEdgeThreshold, 0); 43define_pd_global(intx, Tier2BackEdgeThreshold, 0); 44define_pd_global(intx, Tier3BackEdgeThreshold, 0); 45define_pd_global(intx, Tier4BackEdgeThreshold, 0); 46 47define_pd_global(intx, OnStackReplacePercentage, 0); 48define_pd_global(bool, ResizeTLAB, false); 49define_pd_global(intx, FreqInlineSize, 0); 50define_pd_global(intx, NewSizeThreadIncrease, 4*K); 51define_pd_global(intx, NewRatio, 4); 52define_pd_global(intx, InlineClassNatives, true); 53define_pd_global(intx, InlineUnsafeOps, true); 54define_pd_global(intx, InitialCodeCacheSize, 160*K); 55define_pd_global(intx, ReservedCodeCacheSize, 32*M); 56define_pd_global(intx, CodeCacheExpansionSize, 32*K); 57define_pd_global(intx, CodeCacheMinBlockLength, 1); 58define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 59define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 60define_pd_global(bool, NeverActAsServerClassMachine, true); 61define_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 75typedef const char* ccstr; 76typedef const char* ccstrlist; // represents string arguments which accumulate 77 78enum 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 89struct 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 139class 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 148class CounterSetting { 149 intx* counter; 150 public: 151 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 152 ~CounterSetting() { (*counter)--; } 153}; 154 155 156class 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 165class 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 174class 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 develop(bool, TraceItables, false, \ 348 "Trace initialization and use of itables") \ 349 \ 350 develop(bool, TracePcPatching, false, \ 351 "Trace usage of frame::patch_pc") \ 352 \ 353 develop(bool, TraceJumps, false, \ 354 "Trace assembly jumps in thread ring buffer") \ 355 \ 356 develop(bool, TraceRelocator, false, \ 357 "Trace the bytecode relocator") \ 358 \ 359 develop(bool, TraceLongCompiles, false, \ 360 "Print out every time compilation is longer than " \ 361 "a given threashold") \ 362 \ 363 develop(bool, SafepointALot, false, \ 364 "Generates a lot of safepoints. Works with " \ 365 "GuaranteedSafepointInterval") \ 366 \ 367 product_pd(bool, BackgroundCompilation, \ 368 "A thread requesting compilation is not blocked during " \ 369 "compilation") \ 370 \ 371 product(bool, PrintVMQWaitTime, false, \ 372 "Prints out the waiting time in VM operation queue") \ 373 \ 374 develop(bool, BailoutToInterpreterForThrows, false, \ 375 "Compiled methods which throws/catches exceptions will be " \ 376 "deopt and intp.") \ 377 \ 378 develop(bool, NoYieldsInMicrolock, false, \ 379 "Disable yields in microlock") \ 380 \ 381 develop(bool, TraceOopMapGeneration, false, \ 382 "Shows oopmap generation") \ 383 \ 384 product(bool, MethodFlushing, true, \ 385 "Reclamation of zombie and not-entrant methods") \ 386 \ 387 develop(bool, VerifyStack, false, \ 388 "Verify stack of each thread when it is entering a runtime call") \ 389 \ 390 develop(bool, ForceUnreachable, false, \ 391 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 392 \ 393 notproduct(bool, StressDerivedPointers, false, \ 394 "Force scavenge when a derived pointers is detected on stack " \ 395 "after rtm call") \ 396 \ 397 develop(bool, TraceDerivedPointers, false, \ 398 "Trace traversal of derived pointers on stack") \ 399 \ 400 notproduct(bool, TraceCodeBlobStacks, false, \ 401 "Trace stack-walk of codeblobs") \ 402 \ 403 product(bool, PrintJNIResolving, false, \ 404 "Used to implement -v:jni") \ 405 \ 406 notproduct(bool, PrintRewrites, false, \ 407 "Print methods that are being rewritten") \ 408 \ 409 product(bool, UseInlineCaches, true, \ 410 "Use Inline Caches for virtual calls ") \ 411 \ 412 develop(bool, InlineArrayCopy, true, \ 413 "inline arraycopy native that is known to be part of " \ 414 "base library DLL") \ 415 \ 416 develop(bool, InlineObjectHash, true, \ 417 "inline Object::hashCode() native that is known to be part " \ 418 "of base library DLL") \ 419 \ 420 develop(bool, InlineObjectCopy, true, \ 421 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 422 \ 423 develop(bool, InlineNatives, true, \ 424 "inline natives that are known to be part of base library DLL") \ 425 \ 426 develop(bool, InlineMathNatives, true, \ 427 "inline SinD, CosD, etc.") \ 428 \ 429 develop(bool, InlineClassNatives, true, \ 430 "inline Class.isInstance, etc") \ 431 \ 432 develop(bool, InlineAtomicLong, true, \ 433 "inline sun.misc.AtomicLong") \ 434 \ 435 develop(bool, InlineThreadNatives, true, \ 436 "inline Thread.currentThread, etc") \ 437 \ 438 develop(bool, InlineReflectionGetCallerClass, true, \ 439 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 440 "of base library DLL") \ 441 \ 442 develop(bool, InlineUnsafeOps, true, \ 443 "inline memory ops (native methods) from sun.misc.Unsafe") \ 444 \ 445 develop(bool, ConvertCmpD2CmpF, true, \ 446 "Convert cmpD to cmpF when one input is constant in float range") \ 447 \ 448 develop(bool, ConvertFloat2IntClipping, true, \ 449 "Convert float2int clipping idiom to integer clipping") \ 450 \ 451 develop(bool, SpecialStringCompareTo, true, \ 452 "special version of string compareTo") \ 453 \ 454 develop(bool, SpecialStringIndexOf, true, \ 455 "special version of string indexOf") \ 456 \ 457 develop(bool, TraceCallFixup, false, \ 458 "traces all call fixups") \ 459 \ 460 develop(bool, DeoptimizeALot, false, \ 461 "deoptimize at every exit from the runtime system") \ 462 \ 463 develop(ccstrlist, DeoptimizeOnlyAt, "", \ 464 "a comma separated list of bcis to deoptimize at") \ 465 \ 466 product(bool, DeoptimizeRandom, false, \ 467 "deoptimize random frames on random exit from the runtime system")\ 468 \ 469 notproduct(bool, ZombieALot, false, \ 470 "creates zombies (non-entrant) at exit from the runt. system") \ 471 \ 472 notproduct(bool, WalkStackALot, false, \ 473 "trace stack (no print) at every exit from the runtime system") \ 474 \ 475 develop(bool, Debugging, false, \ 476 "set when executing debug methods in debug.ccp " \ 477 "(to prevent triggering assertions)") \ 478 \ 479 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 480 "Enable strict checks that safepoints cannot happen for threads " \ 481 "that used No_Safepoint_Verifier") \ 482 \ 483 notproduct(bool, VerifyLastFrame, false, \ 484 "Verify oops on last frame on entry to VM") \ 485 \ 486 develop(bool, TraceHandleAllocation, false, \ 487 "Prints out warnings when suspicious many handles are allocated") \ 488 \ 489 product(bool, UseCompilerSafepoints, true, \ 490 "Stop at safepoints in compiled code") \ 491 \ 492 product(bool, UseSplitVerifier, true, \ 493 "use split verifier with StackMapTable attributes") \ 494 \ 495 product(bool, FailOverToOldVerifier, true, \ 496 "fail over to old verifier when split verifier fails") \ 497 \ 498 develop(bool, ShowSafepointMsgs, false, \ 499 "Show msg. about safepoint synch.") \ 500 \ 501 product(bool, SafepointTimeout, false, \ 502 "Time out and warn or fail after SafepointTimeoutDelay " \ 503 "milliseconds if failed to reach safepoint") \ 504 \ 505 develop(bool, DieOnSafepointTimeout, false, \ 506 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 507 \ 508 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 509 /* typically, at most a few retries are needed */ \ 510 product(intx, SuspendRetryCount, 50, \ 511 "Maximum retry count for an external suspend request") \ 512 \ 513 product(intx, SuspendRetryDelay, 5, \ 514 "Milliseconds to delay per retry (* current_retry_count)") \ 515 \ 516 product(bool, AssertOnSuspendWaitFailure, false, \ 517 "Assert/Guarantee on external suspend wait failure") \ 518 \ 519 product(bool, TraceSuspendWaitFailures, false, \ 520 "Trace external suspend wait failures") \ 521 \ 522 product(bool, MaxFDLimit, true, \ 523 "Bump the number of file descriptors to max in solaris.") \ 524 \ 525 notproduct(bool, LogEvents, trueInDebug, \ 526 "Enable Event log") \ 527 \ 528 product(bool, BytecodeVerificationRemote, true, \ 529 "Enables the Java bytecode verifier for remote classes") \ 530 \ 531 product(bool, BytecodeVerificationLocal, false, \ 532 "Enables the Java bytecode verifier for local classes") \ 533 \ 534 develop(bool, ForceFloatExceptions, trueInDebug, \ 535 "Force exceptions on FP stack under/overflow") \ 536 \ 537 develop(bool, SoftMatchFailure, trueInProduct, \ 538 "If the DFA fails to match a node, print a message and bail out") \ 539 \ 540 develop(bool, VerifyStackAtCalls, false, \ 541 "Verify that the stack pointer is unchanged after calls") \ 542 \ 543 develop(bool, TraceJavaAssertions, false, \ 544 "Trace java language assertions") \ 545 \ 546 notproduct(bool, CheckAssertionStatusDirectives, false, \ 547 "temporary - see javaClasses.cpp") \ 548 \ 549 notproduct(bool, PrintMallocFree, false, \ 550 "Trace calls to C heap malloc/free allocation") \ 551 \ 552 notproduct(bool, PrintOopAddress, false, \ 553 "Always print the location of the oop") \ 554 \ 555 notproduct(bool, VerifyCodeCacheOften, false, \ 556 "Verify compiled-code cache often") \ 557 \ 558 develop(bool, ZapDeadCompiledLocals, false, \ 559 "Zap dead locals in compiler frames") \ 560 \ 561 notproduct(bool, ZapDeadLocalsOld, false, \ 562 "Zap dead locals (old version, zaps all frames when " \ 563 "entering the VM") \ 564 \ 565 notproduct(bool, CheckOopishValues, false, \ 566 "Warn if value contains oop ( requires ZapDeadLocals)") \ 567 \ 568 develop(bool, UseMallocOnly, false, \ 569 "use only malloc/free for allocation (no resource area/arena)") \ 570 \ 571 develop(bool, PrintMalloc, false, \ 572 "print all malloc/free calls") \ 573 \ 574 develop(bool, ZapResourceArea, trueInDebug, \ 575 "Zap freed resource/arena space with 0xABABABAB") \ 576 \ 577 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 578 "Zap freed VM handle space with 0xBCBCBCBC") \ 579 \ 580 develop(bool, ZapJNIHandleArea, trueInDebug, \ 581 "Zap freed JNI handle space with 0xFEFEFEFE") \ 582 \ 583 develop(bool, ZapUnusedHeapArea, false, \ 584 "Zap unused heap space with 0xBAADBABE") \ 585 \ 586 develop(bool, PrintVMMessages, true, \ 587 "Print vm messages on console") \ 588 \ 589 product(bool, PrintGCApplicationConcurrentTime, false, \ 590 "Print the time the application has been running") \ 591 \ 592 product(bool, PrintGCApplicationStoppedTime, false, \ 593 "Print the time the application has been stopped") \ 594 \ 595 develop(bool, Verbose, false, \ 596 "Prints additional debugging information from other modes") \ 597 \ 598 develop(bool, PrintMiscellaneous, false, \ 599 "Prints uncategorized debugging information (requires +Verbose)") \ 600 \ 601 develop(bool, WizardMode, false, \ 602 "Prints much more debugging information") \ 603 \ 604 product(bool, ShowMessageBoxOnError, false, \ 605 "Keep process alive on VM fatal error") \ 606 \ 607 product_pd(bool, UseOSErrorReporting, \ 608 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 609 \ 610 product(bool, SuppressFatalErrorMessage, false, \ 611 "Do NO Fatal Error report [Avoid deadlock]") \ 612 \ 613 product(ccstrlist, OnError, "", \ 614 "Run user-defined commands on fatal error; see VMError.cpp " \ 615 "for examples") \ 616 \ 617 product(ccstrlist, OnOutOfMemoryError, "", \ 618 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 619 \ 620 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 621 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 622 \ 623 manageable(ccstr, HeapDumpPath, NULL, \ 624 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 625 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 626 "in the working directory)") \ 627 \ 628 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 629 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 630 "when the heap usage is larger than this") \ 631 \ 632 develop(uintx, HeapDumpSegmentSize, 1*G, \ 633 "Approximate segment size when generating a segmented heap dump") \ 634 \ 635 develop(bool, BreakAtWarning, false, \ 636 "Execute breakpoint upon encountering VM warning") \ 637 \ 638 product_pd(bool, UseVectoredExceptions, \ 639 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 640 \ 641 develop(bool, TraceVMOperation, false, \ 642 "Trace vm operations") \ 643 \ 644 develop(bool, UseFakeTimers, false, \ 645 "Tells whether the VM should use system time or a fake timer") \ 646 \ 647 diagnostic(bool, LogCompilation, false, \ 648 "Log compilation activity in detail to hotspot.log or LogFile") \ 649 \ 650 product(bool, PrintCompilation, false, \ 651 "Print compilations") \ 652 \ 653 diagnostic(bool, TraceNMethodInstalls, false, \ 654 "Trace nmethod intallation") \ 655 \ 656 diagnostic(bool, TraceOSRBreakpoint, false, \ 657 "Trace OSR Breakpoint ") \ 658 \ 659 diagnostic(bool, TraceCompileTriggered, false, \ 660 "Trace compile triggered") \ 661 \ 662 diagnostic(bool, TraceTriggers, false, \ 663 "Trace triggers") \ 664 \ 665 product(bool, AlwaysRestoreFPU, false, \ 666 "Restore the FPU control word after every JNI call (expensive)") \ 667 \ 668 notproduct(bool, PrintCompilation2, false, \ 669 "Print additional statistics per compilation") \ 670 \ 671 diagnostic(bool, PrintAdapterHandlers, false, \ 672 "Print code generated for i2c/c2i adapters") \ 673 \ 674 diagnostic(bool, PrintAssembly, false, \ 675 "Print assembly code (using external disassembler.so)") \ 676 \ 677 diagnostic(ccstr, PrintAssemblyOptions, false, \ 678 "Options string passed to disassembler.so") \ 679 \ 680 diagnostic(bool, PrintNMethods, false, \ 681 "Print assembly code for nmethods when generated") \ 682 \ 683 diagnostic(bool, PrintNativeNMethods, false, \ 684 "Print assembly code for native nmethods when generated") \ 685 \ 686 develop(bool, PrintDebugInfo, false, \ 687 "Print debug information for all nmethods when generated") \ 688 \ 689 develop(bool, PrintRelocations, false, \ 690 "Print relocation information for all nmethods when generated") \ 691 \ 692 develop(bool, PrintDependencies, false, \ 693 "Print dependency information for all nmethods when generated") \ 694 \ 695 develop(bool, PrintExceptionHandlers, false, \ 696 "Print exception handler tables for all nmethods when generated") \ 697 \ 698 develop(bool, InterceptOSException, false, \ 699 "Starts debugger when an implicit OS (e.g., NULL) " \ 700 "exception happens") \ 701 \ 702 notproduct(bool, PrintCodeCache, false, \ 703 "Print the compiled_code cache when exiting") \ 704 \ 705 develop(bool, PrintCodeCache2, false, \ 706 "Print detailed info on the compiled_code cache when exiting") \ 707 \ 708 diagnostic(bool, PrintStubCode, false, \ 709 "Print generated stub code") \ 710 \ 711 product(bool, StackTraceInThrowable, true, \ 712 "Collect backtrace in throwable when exception happens") \ 713 \ 714 product(bool, OmitStackTraceInFastThrow, true, \ 715 "Omit backtraces for some 'hot' exceptions in optimized code") \ 716 \ 717 product(bool, ProfilerPrintByteCodeStatistics, false, \ 718 "Prints byte code statictics when dumping profiler output") \ 719 \ 720 product(bool, ProfilerRecordPC, false, \ 721 "Collects tick for each 16 byte interval of compiled code") \ 722 \ 723 product(bool, ProfileVM, false, \ 724 "Profiles ticks that fall within VM (either in the VM Thread " \ 725 "or VM code called through stubs)") \ 726 \ 727 product(bool, ProfileIntervals, false, \ 728 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 729 \ 730 notproduct(bool, ProfilerCheckIntervals, false, \ 731 "Collect and print info on spacing of profiler ticks") \ 732 \ 733 develop(bool, PrintJVMWarnings, false, \ 734 "Prints warnings for unimplemented JVM functions") \ 735 \ 736 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 737 "Prints warnings for stalled SpinLocks") \ 738 \ 739 develop(bool, InitializeJavaLangSystem, true, \ 740 "Initialize java.lang.System - turn off for individual " \ 741 "method debugging") \ 742 \ 743 develop(bool, InitializeJavaLangString, true, \ 744 "Initialize java.lang.String - turn off for individual " \ 745 "method debugging") \ 746 \ 747 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 748 "Initialize various error and exception classes - turn off for " \ 749 "individual method debugging") \ 750 \ 751 product(bool, RegisterFinalizersAtInit, true, \ 752 "Register finalizable objects at end of Object.<init> or " \ 753 "after allocation.") \ 754 \ 755 develop(bool, RegisterReferences, true, \ 756 "Tells whether the VM should register soft/weak/final/phantom " \ 757 "references") \ 758 \ 759 develop(bool, IgnoreRewrites, false, \ 760 "Supress rewrites of bytecodes in the oopmap generator. " \ 761 "This is unsafe!") \ 762 \ 763 develop(bool, PrintCodeCacheExtension, false, \ 764 "Print extension of code cache") \ 765 \ 766 develop(bool, UsePrivilegedStack, true, \ 767 "Enable the security JVM functions") \ 768 \ 769 develop(bool, IEEEPrecision, true, \ 770 "Enables IEEE precision (for INTEL only)") \ 771 \ 772 develop(bool, ProtectionDomainVerification, true, \ 773 "Verifies protection domain before resolution in system " \ 774 "dictionary") \ 775 \ 776 product(bool, ClassUnloading, true, \ 777 "Do unloading of classes") \ 778 \ 779 develop(bool, DisableStartThread, false, \ 780 "Disable starting of additional Java threads " \ 781 "(for debugging only)") \ 782 \ 783 develop(bool, MemProfiling, false, \ 784 "Write memory usage profiling to log file") \ 785 \ 786 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 787 "Prints the system dictionary at exit") \ 788 \ 789 diagnostic(bool, UnsyncloadClass, false, \ 790 "Unstable: VM calls loadClass unsynchronized. Custom classloader "\ 791 "must call VM synchronized for findClass & defineClass") \ 792 \ 793 product_pd(bool, DontYieldALot, \ 794 "Throw away obvious excess yield calls (for SOLARIS only)") \ 795 \ 796 product_pd(bool, ConvertSleepToYield, \ 797 "Converts sleep(0) to thread yield " \ 798 "(may be off for SOLARIS to improve GUI)") \ 799 \ 800 product(bool, ConvertYieldToSleep, false, \ 801 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 802 "behavior (SOLARIS only)") \ 803 \ 804 product(bool, UseBoundThreads, true, \ 805 "Bind user level threads to kernel threads (for SOLARIS only)") \ 806 \ 807 develop(bool, UseDetachedThreads, true, \ 808 "Use detached threads that are recycled upon termination " \ 809 "(for SOLARIS only)") \ 810 \ 811 product(bool, UseLWPSynchronization, true, \ 812 "Use LWP-based instead of libthread-based synchronization " \ 813 "(SPARC only)") \ 814 \ 815 product(ccstr, SyncKnobs, "", \ 816 "(Unstable) Various monitor synchronization tunables") \ 817 \ 818 product(intx, EmitSync, 0, \ 819 "(Unsafe,Unstable) " \ 820 " Controls emission of inline sync fast-path code") \ 821 \ 822 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 823 \ 824 product(intx, Atomics, 0, \ 825 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 826 \ 827 product(intx, FenceInstruction, 0, \ 828 "(Unsafe,Unstable) Experimental") \ 829 \ 830 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 831 \ 832 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 833 \ 834 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 835 \ 836 product(intx, hashCode, 0, \ 837 "(Unstable) select hashCode generation algorithm" ) \ 838 \ 839 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 840 "(Unstable, Linux-specific)" \ 841 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 842 \ 843 product(bool, FilterSpuriousWakeups , true, \ 844 "Prevent spurious or premature wakeups from object.wait" \ 845 "(Solaris only)") \ 846 \ 847 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 848 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 849 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 850 \ 851 develop(bool, UsePthreads, false, \ 852 "Use pthread-based instead of libthread-based synchronization " \ 853 "(SPARC only)") \ 854 \ 855 product(bool, AdjustConcurrency, false, \ 856 "call thr_setconcurrency at thread create time to avoid " \ 857 "LWP starvation on MP systems (For Solaris Only)") \ 858 \ 859 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 860 "Should the system attempt to update the compiler file when " \ 861 "an error occurs?") \ 862 \ 863 product(bool, ReduceSignalUsage, false, \ 864 "Reduce the use of OS signals in Java and/or the VM") \ 865 \ 866 notproduct(bool, ValidateMarkSweep, false, \ 867 "Do extra validation during MarkSweep collection") \ 868 \ 869 notproduct(bool, RecordMarkSweepCompaction, false, \ 870 "Enable GC-to-GC recording and querying of compaction during " \ 871 "MarkSweep") \ 872 \ 873 develop_pd(bool, ShareVtableStubs, \ 874 "Share vtable stubs (smaller code but worse branch prediction") \ 875 \ 876 develop(bool, LoadLineNumberTables, true, \ 877 "Tells whether the class file parser loads line number tables") \ 878 \ 879 develop(bool, LoadLocalVariableTables, true, \ 880 "Tells whether the class file parser loads local variable tables")\ 881 \ 882 develop(bool, LoadLocalVariableTypeTables, true, \ 883 "Tells whether the class file parser loads local variable type tables")\ 884 \ 885 product(bool, AllowUserSignalHandlers, false, \ 886 "Do not complain if the application installs signal handlers " \ 887 "(Solaris & Linux only)") \ 888 \ 889 product(bool, UseSignalChaining, true, \ 890 "Use signal-chaining to invoke signal handlers installed " \ 891 "by the application (Solaris & Linux only)") \ 892 \ 893 product(bool, UseAltSigs, false, \ 894 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 895 "internal signals. (Solaris only)") \ 896 \ 897 product(bool, UseSpinning, false, \ 898 "Use spinning in monitor inflation and before entry") \ 899 \ 900 product(bool, PreSpinYield, false, \ 901 "Yield before inner spinning loop") \ 902 \ 903 product(bool, PostSpinYield, true, \ 904 "Yield after inner spinning loop") \ 905 \ 906 product(bool, AllowJNIEnvProxy, false, \ 907 "Allow JNIEnv proxies for jdbx") \ 908 \ 909 product(bool, JNIDetachReleasesMonitors, true, \ 910 "JNI DetachCurrentThread releases monitors owned by thread") \ 911 \ 912 product(bool, RestoreMXCSROnJNICalls, false, \ 913 "Restore MXCSR when returning from JNI calls") \ 914 \ 915 product(bool, CheckJNICalls, false, \ 916 "Verify all arguments to JNI calls") \ 917 \ 918 product(bool, UseFastJNIAccessors, true, \ 919 "Use optimized versions of Get<Primitive>Field") \ 920 \ 921 product(bool, EagerXrunInit, false, \ 922 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 923 " but not all -Xrun libraries may support the state of the VM at this time") \ 924 \ 925 product(bool, PreserveAllAnnotations, false, \ 926 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 927 \ 928 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 929 "Number of OutOfMemoryErrors preallocated with backtrace") \ 930 \ 931 product(bool, LazyBootClassLoader, true, \ 932 "Enable/disable lazy opening of boot class path entries") \ 933 \ 934 diagnostic(bool, UseIncDec, true, \ 935 "Use INC, DEC instructions on x86") \ 936 \ 937 product(bool, UseStoreImmI16, true, \ 938 "Use store immediate 16-bits value instruction on x86") \ 939 \ 940 product(bool, UseAddressNop, false, \ 941 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 942 \ 943 product(bool, UseXmmLoadAndClearUpper, true, \ 944 "Load low part of XMM register and clear upper part") \ 945 \ 946 product(bool, UseXmmRegToRegMoveAll, false, \ 947 "Copy all XMM register bits when moving value between registers") \ 948 \ 949 product(bool, UseXmmI2D, false, \ 950 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 951 \ 952 product(bool, UseXmmI2F, false, \ 953 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 954 \ 955 product(intx, FieldsAllocationStyle, 1, \ 956 "0 - type based with oops first, 1 - with oops last") \ 957 \ 958 product(bool, CompactFields, true, \ 959 "Allocate nonstatic fields in gaps between previous fields") \ 960 \ 961 notproduct(bool, PrintCompactFieldsSavings, false, \ 962 "Print how many words were saved with CompactFields") \ 963 \ 964 product(bool, UseBiasedLocking, true, \ 965 "Enable biased locking in JVM") \ 966 \ 967 product(intx, BiasedLockingStartupDelay, 4000, \ 968 "Number of milliseconds to wait before enabling biased locking") \ 969 \ 970 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 971 "Print statistics of biased locking in JVM") \ 972 \ 973 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 974 "Threshold of number of revocations per type to try to " \ 975 "rebias all objects in the heap of that type") \ 976 \ 977 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 978 "Threshold of number of revocations per type to permanently " \ 979 "revoke biases of all objects in the heap of that type") \ 980 \ 981 product(intx, BiasedLockingDecayTime, 25000, \ 982 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 983 "type after previous bulk rebias") \ 984 \ 985 /* tracing */ \ 986 \ 987 notproduct(bool, TraceRuntimeCalls, false, \ 988 "Trace run-time calls") \ 989 \ 990 develop(bool, TraceJNICalls, false, \ 991 "Trace JNI calls") \ 992 \ 993 notproduct(bool, TraceJVMCalls, false, \ 994 "Trace JVM calls") \ 995 \ 996 product(ccstr, TraceJVMTI, "", \ 997 "Trace flags for JVMTI functions and events") \ 998 \ 999 /* This option can change an EMCP method into an obsolete method. */ \ 1000 /* This can affect tests that except specific methods to be EMCP. */ \ 1001 /* This option should be used with caution. */ \ 1002 product(bool, StressLdcRewrite, false, \ 1003 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1004 \ 1005 product(intx, TraceRedefineClasses, 0, \ 1006 "Trace level for JVMTI RedefineClasses") \ 1007 \ 1008 /* change to false by default sometime after Mustang */ \ 1009 product(bool, VerifyMergedCPBytecodes, true, \ 1010 "Verify bytecodes after RedefineClasses constant pool merging") \ 1011 \ 1012 develop(bool, TraceJNIHandleAllocation, false, \ 1013 "Trace allocation/deallocation of JNI handle blocks") \ 1014 \ 1015 develop(bool, TraceThreadEvents, false, \ 1016 "Trace all thread events") \ 1017 \ 1018 develop(bool, TraceBytecodes, false, \ 1019 "Trace bytecode execution") \ 1020 \ 1021 develop(bool, TraceClassInitialization, false, \ 1022 "Trace class initialization") \ 1023 \ 1024 develop(bool, TraceExceptions, false, \ 1025 "Trace exceptions") \ 1026 \ 1027 develop(bool, TraceICs, false, \ 1028 "Trace inline cache changes") \ 1029 \ 1030 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1031 "Trace method invocation counter overflow") \ 1032 \ 1033 develop(bool, TraceInlineCacheClearing, false, \ 1034 "Trace clearing of inline caches in nmethods") \ 1035 \ 1036 develop(bool, TraceDependencies, false, \ 1037 "Trace dependencies") \ 1038 \ 1039 develop(bool, VerifyDependencies, trueInDebug, \ 1040 "Exercise and verify the compilation dependency mechanism") \ 1041 \ 1042 develop(bool, TraceNewOopMapGeneration, false, \ 1043 "Trace OopMapGeneration") \ 1044 \ 1045 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1046 "Trace OopMapGeneration: print detailed cell states") \ 1047 \ 1048 develop(bool, TimeOopMap, false, \ 1049 "Time calls to GenerateOopMap::compute_map() in sum") \ 1050 \ 1051 develop(bool, TimeOopMap2, false, \ 1052 "Time calls to GenerateOopMap::compute_map() individually") \ 1053 \ 1054 develop(bool, TraceMonitorMismatch, false, \ 1055 "Trace monitor matching failures during OopMapGeneration") \ 1056 \ 1057 develop(bool, TraceOopMapRewrites, false, \ 1058 "Trace rewritting of method oops during oop map generation") \ 1059 \ 1060 develop(bool, TraceSafepoint, false, \ 1061 "Trace safepoint operations") \ 1062 \ 1063 develop(bool, TraceICBuffer, false, \ 1064 "Trace usage of IC buffer") \ 1065 \ 1066 develop(bool, TraceCompiledIC, false, \ 1067 "Trace changes of compiled IC") \ 1068 \ 1069 notproduct(bool, TraceZapDeadLocals, false, \ 1070 "Trace zapping dead locals") \ 1071 \ 1072 develop(bool, TraceStartupTime, false, \ 1073 "Trace setup time") \ 1074 \ 1075 develop(bool, TraceHPI, false, \ 1076 "Trace Host Porting Interface (HPI)") \ 1077 \ 1078 product(ccstr, HPILibPath, NULL, \ 1079 "Specify alternate path to HPI library") \ 1080 \ 1081 develop(bool, TraceProtectionDomainVerification, false, \ 1082 "Trace protection domain verifcation") \ 1083 \ 1084 develop(bool, TraceClearedExceptions, false, \ 1085 "Prints when an exception is forcibly cleared") \ 1086 \ 1087 product(bool, TraceClassResolution, false, \ 1088 "Trace all constant pool resolutions (for debugging)") \ 1089 \ 1090 product(bool, TraceBiasedLocking, false, \ 1091 "Trace biased locking in JVM") \ 1092 \ 1093 product(bool, TraceMonitorInflation, false, \ 1094 "Trace monitor inflation in JVM") \ 1095 \ 1096 /* assembler */ \ 1097 product(bool, Use486InstrsOnly, false, \ 1098 "Use 80486 Compliant instruction subset") \ 1099 \ 1100 /* gc */ \ 1101 \ 1102 product(bool, UseSerialGC, false, \ 1103 "Tells whether the VM should use serial garbage collector") \ 1104 \ 1105 product(bool, UseParallelGC, false, \ 1106 "Use the Parallel Scavenge garbage collector") \ 1107 \ 1108 product(bool, UseParallelOldGC, false, \ 1109 "Use the Parallel Old garbage collector") \ 1110 \ 1111 product(bool, UseParallelOldGCCompacting, true, \ 1112 "In the Parallel Old garbage collector use parallel compaction") \ 1113 \ 1114 product(bool, UseParallelDensePrefixUpdate, true, \ 1115 "In the Parallel Old garbage collector use parallel dense" \ 1116 " prefix update") \ 1117 \ 1118 develop(bool, UseParallelOldGCChunkPointerCalc, true, \ 1119 "In the Parallel Old garbage collector use chucks to calculate" \ 1120 " new object locations") \ 1121 \ 1122 product(uintx, HeapMaximumCompactionInterval, 20, \ 1123 "How often should we maximally compact the heap (not allowing " \ 1124 "any dead space)") \ 1125 \ 1126 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1127 "The collection count for the first maximum compaction") \ 1128 \ 1129 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1130 "In the Parallel Old garbage collector maximum compaction for " \ 1131 "a system GC") \ 1132 \ 1133 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1134 "The mean used by the par compact dead wood" \ 1135 "limiter (a number between 0-100).") \ 1136 \ 1137 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1138 "The standard deviation used by the par compact dead wood" \ 1139 "limiter (a number between 0-100).") \ 1140 \ 1141 product(bool, UseParallelOldGCDensePrefix, true, \ 1142 "Use a dense prefix with the Parallel Old garbage collector") \ 1143 \ 1144 product(uintx, ParallelGCThreads, 0, \ 1145 "Number of parallel threads parallel gc will use") \ 1146 \ 1147 product(uintx, ParallelCMSThreads, 0, \ 1148 "Max number of threads CMS will use for concurrent work") \ 1149 \ 1150 develop(bool, VerifyParallelOldWithMarkSweep, false, \ 1151 "Use the MarkSweep code to verify phases of Parallel Old") \ 1152 \ 1153 develop(uintx, VerifyParallelOldWithMarkSweepInterval, 1, \ 1154 "Interval at which the MarkSweep code is used to verify " \ 1155 "phases of Parallel Old") \ 1156 \ 1157 develop(bool, ParallelOldMTUnsafeMarkBitMap, false, \ 1158 "Use the Parallel Old MT unsafe in marking the bitmap") \ 1159 \ 1160 develop(bool, ParallelOldMTUnsafeUpdateLiveData, false, \ 1161 "Use the Parallel Old MT unsafe in update of live size") \ 1162 \ 1163 develop(bool, TraceChunkTasksQueuing, false, \ 1164 "Trace the queuing of the chunk tasks") \ 1165 \ 1166 product(uintx, YoungPLABSize, 4096, \ 1167 "Size of young gen promotion labs (in HeapWords)") \ 1168 \ 1169 product(uintx, OldPLABSize, 1024, \ 1170 "Size of old gen promotion labs (in HeapWords)") \ 1171 \ 1172 product(uintx, GCTaskTimeStampEntries, 200, \ 1173 "Number of time stamp entries per gc worker thread") \ 1174 \ 1175 product(bool, AlwaysTenure, false, \ 1176 "Always tenure objects in eden. (ParallelGC only)") \ 1177 \ 1178 product(bool, NeverTenure, false, \ 1179 "Never tenure objects in eden, May tenure on overflow" \ 1180 " (ParallelGC only)") \ 1181 \ 1182 product(bool, ScavengeBeforeFullGC, true, \ 1183 "Scavenge youngest generation before each full GC," \ 1184 " used with UseParallelGC") \ 1185 \ 1186 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1187 "Allow scavenges to occur when to_space contains objects.") \ 1188 \ 1189 product(bool, UseConcMarkSweepGC, false, \ 1190 "Use Concurrent Mark-Sweep GC in the old generation") \ 1191 \ 1192 product(bool, ExplicitGCInvokesConcurrent, false, \ 1193 "A System.gc() request invokes a concurrent collection;" \ 1194 " (effective only when UseConcMarkSweepGC)") \ 1195 \ 1196 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1197 "A System.gc() request invokes a concurrent collection and" \ 1198 " also unloads classes during such a concurrent gc cycle " \ 1199 " (effective only when UseConcMarkSweepGC)") \ 1200 \ 1201 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1202 "Use Adaptive Free Lists in the CMS generation") \ 1203 \ 1204 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1205 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1206 \ 1207 develop(bool, RotateCMSCollectionTypes, false, \ 1208 "Rotate the CMS collections among concurrent and STW") \ 1209 \ 1210 product(bool, UseCMSBestFit, true, \ 1211 "Use CMS best fit allocation strategy") \ 1212 \ 1213 product(bool, UseCMSCollectionPassing, true, \ 1214 "Use passing of collection from background to foreground") \ 1215 \ 1216 product(bool, UseParNewGC, false, \ 1217 "Use parallel threads in the new generation.") \ 1218 \ 1219 product(bool, ParallelGCVerbose, false, \ 1220 "Verbose output for parallel GC.") \ 1221 \ 1222 product(intx, ParallelGCBufferWastePct, 10, \ 1223 "wasted fraction of parallel allocation buffer.") \ 1224 \ 1225 product(bool, ParallelGCRetainPLAB, true, \ 1226 "Retain parallel allocation buffers across scavenges.") \ 1227 \ 1228 product(intx, TargetPLABWastePct, 10, \ 1229 "target wasted space in last buffer as pct of overall allocation")\ 1230 \ 1231 product(uintx, PLABWeight, 75, \ 1232 "Percentage (0-100) used to weight the current sample when" \ 1233 "computing exponentially decaying average for ResizePLAB.") \ 1234 \ 1235 product(bool, ResizePLAB, true, \ 1236 "Dynamically resize (survivor space) promotion labs") \ 1237 \ 1238 product(bool, PrintPLAB, false, \ 1239 "Print (survivor space) promotion labs sizing decisions") \ 1240 \ 1241 product(intx, ParGCArrayScanChunk, 50, \ 1242 "Scan a subset and push remainder, if array is bigger than this") \ 1243 \ 1244 product(intx, ParGCDesiredObjsFromOverflowList, 20, \ 1245 "The desired number of objects to claim from the overflow list") \ 1246 \ 1247 product(uintx, CMSParPromoteBlocksToClaim, 50, \ 1248 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1249 "parallel GC.") \ 1250 \ 1251 product(bool, AlwaysPreTouch, false, \ 1252 "It forces all freshly committed pages to be pre-touched.") \ 1253 \ 1254 product(bool, CMSUseOldDefaults, false, \ 1255 "A flag temporarily introduced to allow reverting to some older" \ 1256 "default settings; older as of 6.0 ") \ 1257 \ 1258 product(intx, CMSYoungGenPerWorker, 16*M, \ 1259 "The amount of young gen chosen by default per GC worker " \ 1260 "thread available ") \ 1261 \ 1262 product(bool, CMSIncrementalMode, false, \ 1263 "Whether CMS GC should operate in \"incremental\" mode") \ 1264 \ 1265 product(uintx, CMSIncrementalDutyCycle, 10, \ 1266 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1267 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1268 "value") \ 1269 \ 1270 product(bool, CMSIncrementalPacing, true, \ 1271 "Whether the CMS incremental mode duty cycle should be " \ 1272 "automatically adjusted") \ 1273 \ 1274 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1275 "Lower bound on the duty cycle when CMSIncrementalPacing is" \ 1276 "enabled (a percentage, 0-100).") \ 1277 \ 1278 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1279 "Percentage (0-100) used to add conservatism when computing the" \ 1280 "duty cycle.") \ 1281 \ 1282 product(uintx, CMSIncrementalOffset, 0, \ 1283 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1284 "is shifted to the right within the period between young GCs") \ 1285 \ 1286 product(uintx, CMSExpAvgFactor, 25, \ 1287 "Percentage (0-100) used to weight the current sample when" \ 1288 "computing exponential averages for CMS statistics.") \ 1289 \ 1290 product(uintx, CMS_FLSWeight, 50, \ 1291 "Percentage (0-100) used to weight the current sample when" \ 1292 "computing exponentially decating averages for CMS FLS statistics.") \ 1293 \ 1294 product(uintx, CMS_FLSPadding, 2, \ 1295 "The multiple of deviation from mean to use for buffering" \ 1296 "against volatility in free list demand.") \ 1297 \ 1298 product(uintx, FLSCoalescePolicy, 2, \ 1299 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1300 \ 1301 product(uintx, CMS_SweepWeight, 50, \ 1302 "Percentage (0-100) used to weight the current sample when" \ 1303 "computing exponentially decaying average for inter-sweep duration.") \ 1304 \ 1305 product(uintx, CMS_SweepPadding, 2, \ 1306 "The multiple of deviation from mean to use for buffering" \ 1307 "against volatility in inter-sweep duration.") \ 1308 \ 1309 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1310 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1311 " duration exceeds this threhold in milliseconds") \ 1312 \ 1313 develop(bool, CMSTraceIncrementalMode, false, \ 1314 "Trace CMS incremental mode") \ 1315 \ 1316 develop(bool, CMSTraceIncrementalPacing, false, \ 1317 "Trace CMS incremental mode pacing computation") \ 1318 \ 1319 develop(bool, CMSTraceThreadState, false, \ 1320 "Trace the CMS thread state (enable the trace_state() method)") \ 1321 \ 1322 product(bool, CMSClassUnloadingEnabled, false, \ 1323 "Whether class unloading enabled when using CMS GC") \ 1324 \ 1325 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1326 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1327 " for which classes may not be unloaded") \ 1328 \ 1329 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1330 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1331 \ 1332 product(bool, UseCMSCompactAtFullCollection, true, \ 1333 "Use mark sweep compact at full collections") \ 1334 \ 1335 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1336 "Number of CMS full collection done before compaction if > 0") \ 1337 \ 1338 develop(intx, CMSDictionaryChoice, 0, \ 1339 "Use BinaryTreeDictionary as default in the CMS generation") \ 1340 \ 1341 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1342 "Replenish and indexed free list with this number of chunks") \ 1343 \ 1344 product(bool, CMSLoopWarn, false, \ 1345 "Warn in case of excessive CMS looping") \ 1346 \ 1347 develop(bool, CMSOverflowEarlyRestoration, false, \ 1348 "Whether preserved marks should be restored early") \ 1349 \ 1350 product(uintx, CMSMarkStackSize, 32*K, \ 1351 "Size of CMS marking stack") \ 1352 \ 1353 product(uintx, CMSMarkStackSizeMax, 4*M, \ 1354 "Max size of CMS marking stack") \ 1355 \ 1356 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1357 "Whether we should simulate frequent marking stack / work queue" \ 1358 " overflow") \ 1359 \ 1360 notproduct(intx, CMSMarkStackOverflowInterval, 1000, \ 1361 "A per-thread `interval' counter that determines how frequently" \ 1362 " we simulate overflow; a smaller number increases frequency") \ 1363 \ 1364 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1365 "(Temporary, subject to experimentation)" \ 1366 "Maximum number of abortable preclean iterations, if > 0") \ 1367 \ 1368 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1369 "(Temporary, subject to experimentation)" \ 1370 "Maximum time in abortable preclean in ms") \ 1371 \ 1372 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1373 "(Temporary, subject to experimentation)" \ 1374 "Nominal minimum work per abortable preclean iteration") \ 1375 \ 1376 product(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1377 "(Temporary, subject to experimentation)" \ 1378 " Time that we sleep between iterations when not given" \ 1379 " enough work per iteration") \ 1380 \ 1381 product(uintx, CMSRescanMultiple, 32, \ 1382 "Size (in cards) of CMS parallel rescan task") \ 1383 \ 1384 product(uintx, CMSConcMarkMultiple, 32, \ 1385 "Size (in cards) of CMS concurrent MT marking task") \ 1386 \ 1387 product(uintx, CMSRevisitStackSize, 1*M, \ 1388 "Size of CMS KlassKlass revisit stack") \ 1389 \ 1390 product(bool, CMSAbortSemantics, false, \ 1391 "Whether abort-on-overflow semantics is implemented") \ 1392 \ 1393 product(bool, CMSParallelRemarkEnabled, true, \ 1394 "Whether parallel remark enabled (only if ParNewGC)") \ 1395 \ 1396 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1397 "Whether parallel remark of survivor space" \ 1398 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1399 \ 1400 product(bool, CMSPLABRecordAlways, true, \ 1401 "Whether to always record survivor space PLAB bdries" \ 1402 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1403 \ 1404 product(bool, CMSConcurrentMTEnabled, true, \ 1405 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1406 \ 1407 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1408 "Whether concurrent precleaning enabled in perm gen" \ 1409 " (effective only when CMSPrecleaningEnabled is true)") \ 1410 \ 1411 product(bool, CMSPrecleaningEnabled, true, \ 1412 "Whether concurrent precleaning enabled") \ 1413 \ 1414 product(uintx, CMSPrecleanIter, 3, \ 1415 "Maximum number of precleaning iteration passes") \ 1416 \ 1417 product(uintx, CMSPrecleanNumerator, 2, \ 1418 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1419 " ratio") \ 1420 \ 1421 product(uintx, CMSPrecleanDenominator, 3, \ 1422 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1423 " ratio") \ 1424 \ 1425 product(bool, CMSPrecleanRefLists1, true, \ 1426 "Preclean ref lists during (initial) preclean phase") \ 1427 \ 1428 product(bool, CMSPrecleanRefLists2, false, \ 1429 "Preclean ref lists during abortable preclean phase") \ 1430 \ 1431 product(bool, CMSPrecleanSurvivors1, false, \ 1432 "Preclean survivors during (initial) preclean phase") \ 1433 \ 1434 product(bool, CMSPrecleanSurvivors2, true, \ 1435 "Preclean survivors during abortable preclean phase") \ 1436 \ 1437 product(uintx, CMSPrecleanThreshold, 1000, \ 1438 "Don't re-iterate if #dirty cards less than this") \ 1439 \ 1440 product(bool, CMSCleanOnEnter, true, \ 1441 "Clean-on-enter optimization for reducing number of dirty cards") \ 1442 \ 1443 product(uintx, CMSRemarkVerifyVariant, 1, \ 1444 "Choose variant (1,2) of verification following remark") \ 1445 \ 1446 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1447 "If Eden used is below this value, don't try to schedule remark") \ 1448 \ 1449 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1450 "The Eden occupancy % at which to try and schedule remark pause") \ 1451 \ 1452 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1453 "Start sampling Eden top at least before yg occupancy reaches" \ 1454 " 1/<ratio> of the size at which we plan to schedule remark") \ 1455 \ 1456 product(uintx, CMSSamplingGrain, 16*K, \ 1457 "The minimum distance between eden samples for CMS (see above)") \ 1458 \ 1459 product(bool, CMSScavengeBeforeRemark, false, \ 1460 "Attempt scavenge before the CMS remark step") \ 1461 \ 1462 develop(bool, CMSTraceSweeper, false, \ 1463 "Trace some actions of the CMS sweeper") \ 1464 \ 1465 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1466 "Don't drain below this size per parallel worker/thief") \ 1467 \ 1468 product(intx, CMSWaitDuration, 2000, \ 1469 "Time in milliseconds that CMS thread waits for young GC") \ 1470 \ 1471 product(bool, CMSYield, true, \ 1472 "Yield between steps of concurrent mark & sweep") \ 1473 \ 1474 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1475 "Bitmap operations should process at most this many bits" \ 1476 "between yields") \ 1477 \ 1478 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1479 "Verify that all refs across the FLS boundary " \ 1480 " are to valid objects") \ 1481 \ 1482 diagnostic(bool, FLSVerifyLists, false, \ 1483 "Do lots of (expensive) FreeListSpace verification") \ 1484 \ 1485 diagnostic(bool, FLSVerifyIndexTable, false, \ 1486 "Do lots of (expensive) FLS index table verification") \ 1487 \ 1488 develop(bool, FLSVerifyDictionary, false, \ 1489 "Do lots of (expensive) FLS dictionary verification") \ 1490 \ 1491 develop(bool, VerifyBlockOffsetArray, false, \ 1492 "Do (expensive!) block offset array verification") \ 1493 \ 1494 product(bool, BlockOffsetArrayUseUnallocatedBlock, trueInDebug, \ 1495 "Maintain _unallocated_block in BlockOffsetArray" \ 1496 " (currently applicable only to CMS collector)") \ 1497 \ 1498 develop(bool, TraceCMSState, false, \ 1499 "Trace the state of the CMS collection") \ 1500 \ 1501 product(intx, RefDiscoveryPolicy, 0, \ 1502 "Whether reference-based(0) or referent-based(1)") \ 1503 \ 1504 product(bool, ParallelRefProcEnabled, false, \ 1505 "Enable parallel reference processing whenever possible") \ 1506 \ 1507 product(bool, ParallelRefProcBalancingEnabled, true, \ 1508 "Enable balancing of reference processing queues") \ 1509 \ 1510 product(intx, CMSTriggerRatio, 80, \ 1511 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1512 " allocated before a CMS collection cycle commences") \ 1513 \ 1514 product(intx, CMSTriggerPermRatio, 80, \ 1515 "Percentage of MinHeapFreeRatio in the CMS perm generation that" \ 1516 " is allocated before a CMS collection cycle commences, that " \ 1517 " also collects the perm generation") \ 1518 \ 1519 product(uintx, CMSBootstrapOccupancy, 50, \ 1520 "Percentage CMS generation occupancy at which to " \ 1521 " initiate CMS collection for bootstrapping collection stats") \ 1522 \ 1523 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1524 "Percentage CMS generation occupancy to start a CMS collection " \ 1525 " cycle (A negative value means that CMSTriggerRatio is used)") \ 1526 \ 1527 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1528 "Percentage CMS perm generation occupancy to start a CMScollection"\ 1529 " cycle (A negative value means that CMSTriggerPermRatio is used)")\ 1530 \ 1531 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1532 "Only use occupancy as a crierion for starting a CMS collection") \ 1533 \ 1534 product(intx, CMSIsTooFullPercentage, 98, \ 1535 "An absolute ceiling above which CMS will always consider the" \ 1536 " perm gen ripe for collection") \ 1537 \ 1538 develop(bool, CMSTestInFreeList, false, \ 1539 "Check if the coalesced range is already in the " \ 1540 "free lists as claimed.") \ 1541 \ 1542 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1543 "Check that all the garbage collected was returned to the " \ 1544 "free lists.") \ 1545 \ 1546 notproduct(bool, ScavengeALot, false, \ 1547 "Force scavenge at every Nth exit from the runtime system " \ 1548 "(N=ScavengeALotInterval)") \ 1549 \ 1550 develop(bool, FullGCALot, false, \ 1551 "Force full gc at every Nth exit from the runtime system " \ 1552 "(N=FullGCALotInterval)") \ 1553 \ 1554 notproduct(bool, GCALotAtAllSafepoints, false, \ 1555 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1556 \ 1557 product(bool, HandlePromotionFailure, true, \ 1558 "The youngest generation collection does not require" \ 1559 " a guarantee of full promotion of all live objects.") \ 1560 \ 1561 notproduct(bool, PromotionFailureALot, false, \ 1562 "Use promotion failure handling on every youngest generation " \ 1563 "collection") \ 1564 \ 1565 develop(uintx, PromotionFailureALotCount, 1000, \ 1566 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1567 "refill attempts (ParNew) or promotion attempts " \ 1568 "(other young collectors) ") \ 1569 \ 1570 develop(uintx, PromotionFailureALotInterval, 5, \ 1571 "Total collections between promotion failures alot") \ 1572 \ 1573 develop(intx, WorkStealingSleepMillis, 1, \ 1574 "Sleep time when sleep is used for yields") \ 1575 \ 1576 develop(uintx, WorkStealingYieldsBeforeSleep, 1000, \ 1577 "Number of yields before a sleep is done during workstealing") \ 1578 \ 1579 product(uintx, PreserveMarkStackSize, 40, \ 1580 "Size for stack used in promotion failure handling") \ 1581 \ 1582 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1583 \ 1584 product_pd(bool, ResizeTLAB, \ 1585 "Dynamically resize tlab size for threads") \ 1586 \ 1587 product(bool, ZeroTLAB, false, \ 1588 "Zero out the newly created TLAB") \ 1589 \ 1590 product(bool, PrintTLAB, false, \ 1591 "Print various TLAB related information") \ 1592 \ 1593 product(bool, TLABStats, true, \ 1594 "Print various TLAB related information") \ 1595 \ 1596 product_pd(bool, NeverActAsServerClassMachine, \ 1597 "Never act like a server-class machine") \ 1598 \ 1599 product(bool, AlwaysActAsServerClassMachine, false, \ 1600 "Always act like a server-class machine") \ 1601 \ 1602 product_pd(uintx, DefaultMaxRAM, \ 1603 "Maximum real memory size for setting server class heap size") \ 1604 \ 1605 product(uintx, DefaultMaxRAMFraction, 4, \ 1606 "Fraction (1/n) of real memory used for server class max heap") \ 1607 \ 1608 product(uintx, DefaultInitialRAMFraction, 64, \ 1609 "Fraction (1/n) of real memory used for server class initial heap") \ 1610 \ 1611 product(bool, UseAutoGCSelectPolicy, false, \ 1612 "Use automatic collection selection policy") \ 1613 \ 1614 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1615 "Automatic GC selection pause threshhold in ms") \ 1616 \ 1617 product(bool, UseAdaptiveSizePolicy, true, \ 1618 "Use adaptive generation sizing policies") \ 1619 \ 1620 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1621 "Use adaptive survivor sizing policies") \ 1622 \ 1623 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1624 "Use adaptive young-old sizing policies at minor collections") \ 1625 \ 1626 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1627 "Use adaptive young-old sizing policies at major collections") \ 1628 \ 1629 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1630 "Use statistics from System.GC for adaptive size policy") \ 1631 \ 1632 product(bool, UseAdaptiveGCBoundary, false, \ 1633 "Allow young-old boundary to move") \ 1634 \ 1635 develop(bool, TraceAdaptiveGCBoundary, false, \ 1636 "Trace young-old boundary moves") \ 1637 \ 1638 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1639 "Resize the virtual spaces of the young or old generations") \ 1640 \ 1641 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1642 "Policy for changeing generation size for throughput goals") \ 1643 \ 1644 product(uintx, AdaptiveSizePausePolicy, 0, \ 1645 "Policy for changing generation size for pause goals") \ 1646 \ 1647 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 1648 "Adjust tenured generation to achive a minor pause goal") \ 1649 \ 1650 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 1651 "Adjust young generation to achive a major pause goal") \ 1652 \ 1653 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 1654 "Number of steps where heuristics is used before data is used") \ 1655 \ 1656 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 1657 "Number of collections before the adaptive sizing is started") \ 1658 \ 1659 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 1660 "Collecton interval for printing information, zero => never") \ 1661 \ 1662 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 1663 "Use adaptive minimum footprint as a goal") \ 1664 \ 1665 product(uintx, AdaptiveSizePolicyWeight, 10, \ 1666 "Weight given to exponential resizing, between 0 and 100") \ 1667 \ 1668 product(uintx, AdaptiveTimeWeight, 25, \ 1669 "Weight given to time in adaptive policy, between 0 and 100") \ 1670 \ 1671 product(uintx, PausePadding, 1, \ 1672 "How much buffer to keep for pause time") \ 1673 \ 1674 product(uintx, PromotedPadding, 3, \ 1675 "How much buffer to keep for promotion failure") \ 1676 \ 1677 product(uintx, SurvivorPadding, 3, \ 1678 "How much buffer to keep for survivor overflow") \ 1679 \ 1680 product(uintx, AdaptivePermSizeWeight, 20, \ 1681 "Weight for perm gen exponential resizing, between 0 and 100") \ 1682 \ 1683 product(uintx, PermGenPadding, 3, \ 1684 "How much buffer to keep for perm gen sizing") \ 1685 \ 1686 product(uintx, ThresholdTolerance, 10, \ 1687 "Allowed collection cost difference between generations") \ 1688 \ 1689 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 1690 "If collection costs are within margin, reduce both by full delta") \ 1691 \ 1692 product(uintx, YoungGenerationSizeIncrement, 20, \ 1693 "Adaptive size percentage change in young generation") \ 1694 \ 1695 product(uintx, YoungGenerationSizeSupplement, 80, \ 1696 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 1697 \ 1698 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 1699 "Decay factor to YoungedGenerationSizeSupplement") \ 1700 \ 1701 product(uintx, TenuredGenerationSizeIncrement, 20, \ 1702 "Adaptive size percentage change in tenured generation") \ 1703 \ 1704 product(uintx, TenuredGenerationSizeSupplement, 80, \ 1705 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 1706 \ 1707 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 1708 "Decay factor to TenuredGenerationSizeIncrement") \ 1709 \ 1710 product(uintx, MaxGCPauseMillis, max_uintx, \ 1711 "Adaptive size policy maximum GC pause time goal in msec") \ 1712 \ 1713 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 1714 "Adaptive size policy maximum GC minor pause time goal in msec") \ 1715 \ 1716 product(uintx, GCTimeRatio, 99, \ 1717 "Adaptive size policy application time to GC time ratio") \ 1718 \ 1719 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 1720 "Adaptive size scale down factor for shrinking") \ 1721 \ 1722 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 1723 "Adaptive size decays the major cost for long major intervals") \ 1724 \ 1725 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 1726 "Time scale over which major costs decay") \ 1727 \ 1728 product(uintx, MinSurvivorRatio, 3, \ 1729 "Minimum ratio of young generation/survivor space size") \ 1730 \ 1731 product(uintx, InitialSurvivorRatio, 8, \ 1732 "Initial ratio of eden/survivor space size") \ 1733 \ 1734 product(uintx, BaseFootPrintEstimate, 256*M, \ 1735 "Estimate of footprint other than Java Heap") \ 1736 \ 1737 product(bool, UseGCOverheadLimit, true, \ 1738 "Use policy to limit of proportion of time spent in GC " \ 1739 "before an OutOfMemory error is thrown") \ 1740 \ 1741 product(uintx, GCTimeLimit, 98, \ 1742 "Limit of proportion of time spent in GC before an OutOfMemory" \ 1743 "error is thrown (used with GCHeapFreeLimit)") \ 1744 \ 1745 product(uintx, GCHeapFreeLimit, 2, \ 1746 "Minimum percentage of free space after a full GC before an " \ 1747 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 1748 \ 1749 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 1750 "Number of consecutive collections before gc time limit fires") \ 1751 \ 1752 product(bool, PrintAdaptiveSizePolicy, false, \ 1753 "Print information about AdaptiveSizePolicy") \ 1754 \ 1755 product(intx, PrefetchCopyIntervalInBytes, -1, \ 1756 "How far ahead to prefetch destination area (<= 0 means off)") \ 1757 \ 1758 product(intx, PrefetchScanIntervalInBytes, -1, \ 1759 "How far ahead to prefetch scan area (<= 0 means off)") \ 1760 \ 1761 product(intx, PrefetchFieldsAhead, -1, \ 1762 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 1763 \ 1764 develop(bool, UsePrefetchQueue, true, \ 1765 "Use the prefetch queue during PS promotion") \ 1766 \ 1767 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 1768 "Verify system before exiting") \ 1769 \ 1770 diagnostic(bool, VerifyBeforeGC, false, \ 1771 "Verify memory system before GC") \ 1772 \ 1773 diagnostic(bool, VerifyAfterGC, false, \ 1774 "Verify memory system after GC") \ 1775 \ 1776 diagnostic(bool, VerifyDuringGC, false, \ 1777 "Verify memory system during GC (between phases)") \ 1778 \ 1779 diagnostic(bool, VerifyRememberedSets, false, \ 1780 "Verify GC remembered sets") \ 1781 \ 1782 diagnostic(bool, VerifyObjectStartArray, true, \ 1783 "Verify GC object start array if verify before/after") \ 1784 \ 1785 product(bool, DisableExplicitGC, false, \ 1786 "Tells whether calling System.gc() does a full GC") \ 1787 \ 1788 notproduct(bool, CheckMemoryInitialization, false, \ 1789 "Checks memory initialization") \ 1790 \ 1791 product(bool, CollectGen0First, false, \ 1792 "Collect youngest generation before each full GC") \ 1793 \ 1794 diagnostic(bool, BindCMSThreadToCPU, false, \ 1795 "Bind CMS Thread to CPU if possible") \ 1796 \ 1797 diagnostic(uintx, CPUForCMSThread, 0, \ 1798 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 1799 \ 1800 product(bool, BindGCTaskThreadsToCPUs, false, \ 1801 "Bind GCTaskThreads to CPUs if possible") \ 1802 \ 1803 product(bool, UseGCTaskAffinity, false, \ 1804 "Use worker affinity when asking for GCTasks") \ 1805 \ 1806 product(uintx, ProcessDistributionStride, 4, \ 1807 "Stride through processors when distributing processes") \ 1808 \ 1809 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 1810 "number of times the coordinator GC thread will sleep while " \ 1811 "yielding before giving up and resuming GC") \ 1812 \ 1813 product(uintx, CMSYieldSleepCount, 0, \ 1814 "number of times a GC thread (minus the coordinator) " \ 1815 "will sleep while yielding before giving up and resuming GC") \ 1816 \ 1817 notproduct(bool, PrintFlagsFinal, false, \ 1818 "Print all command line flags after argument processing") \ 1819 \ 1820 /* gc tracing */ \ 1821 manageable(bool, PrintGC, false, \ 1822 "Print message at garbage collect") \ 1823 \ 1824 manageable(bool, PrintGCDetails, false, \ 1825 "Print more details at garbage collect") \ 1826 \ 1827 manageable(bool, PrintGCDateStamps, false, \ 1828 "Print date stamps at garbage collect") \ 1829 \ 1830 manageable(bool, PrintGCTimeStamps, false, \ 1831 "Print timestamps at garbage collect") \ 1832 \ 1833 product(bool, PrintGCTaskTimeStamps, false, \ 1834 "Print timestamps for individual gc worker thread tasks") \ 1835 \ 1836 develop(intx, ConcGCYieldTimeout, 0, \ 1837 "If non-zero, assert that GC threads yield within this # of ms.") \ 1838 \ 1839 notproduct(bool, TraceMarkSweep, false, \ 1840 "Trace mark sweep") \ 1841 \ 1842 product(bool, PrintReferenceGC, false, \ 1843 "Print times spent handling reference objects during GC " \ 1844 " (enabled only when PrintGCDetails)") \ 1845 \ 1846 develop(bool, TraceReferenceGC, false, \ 1847 "Trace handling of soft/weak/final/phantom references") \ 1848 \ 1849 develop(bool, TraceFinalizerRegistration, false, \ 1850 "Trace registration of final references") \ 1851 \ 1852 notproduct(bool, TraceScavenge, false, \ 1853 "Trace scavenge") \ 1854 \ 1855 product_rw(bool, TraceClassLoading, false, \ 1856 "Trace all classes loaded") \ 1857 \ 1858 product(bool, TraceClassLoadingPreorder, false, \ 1859 "Trace all classes loaded in order referenced (not loaded)") \ 1860 \ 1861 product_rw(bool, TraceClassUnloading, false, \ 1862 "Trace unloading of classes") \ 1863 \ 1864 product_rw(bool, TraceLoaderConstraints, false, \ 1865 "Trace loader constraints") \ 1866 \ 1867 product(bool, TraceGen0Time, false, \ 1868 "Trace accumulated time for Gen 0 collection") \ 1869 \ 1870 product(bool, TraceGen1Time, false, \ 1871 "Trace accumulated time for Gen 1 collection") \ 1872 \ 1873 product(bool, PrintTenuringDistribution, false, \ 1874 "Print tenuring age information") \ 1875 \ 1876 product_rw(bool, PrintHeapAtGC, false, \ 1877 "Print heap layout before and after each GC") \ 1878 \ 1879 product(bool, PrintHeapAtSIGBREAK, true, \ 1880 "Print heap layout in response to SIGBREAK") \ 1881 \ 1882 manageable(bool, PrintClassHistogram, false, \ 1883 "Print a histogram of class instances") \ 1884 \ 1885 develop(bool, TraceWorkGang, false, \ 1886 "Trace activities of work gangs") \ 1887 \ 1888 product(bool, TraceParallelOldGCTasks, false, \ 1889 "Trace multithreaded GC activity") \ 1890 \ 1891 develop(bool, TraceBlockOffsetTable, false, \ 1892 "Print BlockOffsetTable maps") \ 1893 \ 1894 develop(bool, TraceCardTableModRefBS, false, \ 1895 "Print CardTableModRefBS maps") \ 1896 \ 1897 develop(bool, TraceGCTaskManager, false, \ 1898 "Trace actions of the GC task manager") \ 1899 \ 1900 develop(bool, TraceGCTaskQueue, false, \ 1901 "Trace actions of the GC task queues") \ 1902 \ 1903 develop(bool, TraceGCTaskThread, false, \ 1904 "Trace actions of the GC task threads") \ 1905 \ 1906 product(bool, PrintParallelOldGCPhaseTimes, false, \ 1907 "Print the time taken by each parallel old gc phase." \ 1908 "PrintGCDetails must also be enabled.") \ 1909 \ 1910 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 1911 "Trace parallel old gc marking phase") \ 1912 \ 1913 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 1914 "Trace parallel old gc summary phase") \ 1915 \ 1916 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 1917 "Trace parallel old gc compaction phase") \ 1918 \ 1919 develop(bool, TraceParallelOldGCDensePrefix, false, \ 1920 "Trace parallel old gc dense prefix computation") \ 1921 \ 1922 develop(bool, IgnoreLibthreadGPFault, false, \ 1923 "Suppress workaround for libthread GP fault") \ 1924 \ 1925 /* JVMTI heap profiling */ \ 1926 \ 1927 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 1928 "Trace JVMTI object tagging calls") \ 1929 \ 1930 diagnostic(bool, VerifyBeforeIteration, false, \ 1931 "Verify memory system before JVMTI iteration") \ 1932 \ 1933 /* compiler interface */ \ 1934 \ 1935 develop(bool, CIPrintCompilerName, false, \ 1936 "when CIPrint is active, print the name of the active compiler") \ 1937 \ 1938 develop(bool, CIPrintCompileQueue, false, \ 1939 "display the contents of the compile queue whenever a " \ 1940 "compilation is enqueued") \ 1941 \ 1942 develop(bool, CIPrintRequests, false, \ 1943 "display every request for compilation") \ 1944 \ 1945 product(bool, CITime, false, \ 1946 "collect timing information for compilation") \ 1947 \ 1948 develop(bool, CITimeEach, false, \ 1949 "display timing information after each successful compilation") \ 1950 \ 1951 develop(bool, CICountOSR, true, \ 1952 "use a separate counter when assigning ids to osr compilations") \ 1953 \ 1954 develop(bool, CICompileNatives, true, \ 1955 "compile native methods if supported by the compiler") \ 1956 \ 1957 develop_pd(bool, CICompileOSR, \ 1958 "compile on stack replacement methods if supported by the " \ 1959 "compiler") \ 1960 \ 1961 develop(bool, CIPrintMethodCodes, false, \ 1962 "print method bytecodes of the compiled code") \ 1963 \ 1964 develop(bool, CIPrintTypeFlow, false, \ 1965 "print the results of ciTypeFlow analysis") \ 1966 \ 1967 develop(bool, CITraceTypeFlow, false, \ 1968 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 1969 \ 1970 develop(intx, CICloneLoopTestLimit, 100, \ 1971 "size limit for blocks heuristically cloned in ciTypeFlow") \ 1972 \ 1973 /* temp diagnostics */ \ 1974 \ 1975 diagnostic(bool, TraceRedundantCompiles, false, \ 1976 "Have compile broker print when a request already in the queue is"\ 1977 " requested again") \ 1978 \ 1979 diagnostic(bool, InitialCompileFast, false, \ 1980 "Initial compile at CompLevel_fast_compile") \ 1981 \ 1982 diagnostic(bool, InitialCompileReallyFast, false, \ 1983 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 1984 \ 1985 diagnostic(bool, FullProfileOnReInterpret, true, \ 1986 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 1987 \ 1988 /* compiler */ \ 1989 \ 1990 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1991 "Number of compiler threads to run") \ 1992 \ 1993 product(intx, CompilationPolicyChoice, 0, \ 1994 "which compilation policy (0/1)") \ 1995 \ 1996 develop(bool, UseStackBanging, true, \ 1997 "use stack banging for stack overflow checks (required for " \ 1998 "proper StackOverflow handling; disable only to measure cost " \ 1999 "of stackbanging)") \ 2000 \ 2001 develop(bool, Use24BitFPMode, true, \ 2002 "Set 24-bit FPU mode on a per-compile basis ") \ 2003 \ 2004 develop(bool, Use24BitFP, true, \ 2005 "use FP instructions that produce 24-bit precise results") \ 2006 \ 2007 develop(bool, UseStrictFP, true, \ 2008 "use strict fp if modifier strictfp is set") \ 2009 \ 2010 develop(bool, GenerateSynchronizationCode, true, \ 2011 "generate locking/unlocking code for synchronized methods and " \ 2012 "monitors") \ 2013 \ 2014 develop(bool, GenerateCompilerNullChecks, true, \ 2015 "Generate explicit null checks for loads/stores/calls") \ 2016 \ 2017 develop(bool, GenerateRangeChecks, true, \ 2018 "Generate range checks for array accesses") \ 2019 \ 2020 develop_pd(bool, ImplicitNullChecks, \ 2021 "generate code for implicit null checks") \ 2022 \ 2023 product(bool, PrintSafepointStatistics, false, \ 2024 "print statistics about safepoint synchronization") \ 2025 \ 2026 product(intx, PrintSafepointStatisticsCount, 300, \ 2027 "total number of safepoint statistics collected " \ 2028 "before printing them out") \ 2029 \ 2030 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2031 "print safepoint statistics only when safepoint takes" \ 2032 " more than PrintSafepointSatisticsTimeout in millis") \ 2033 \ 2034 develop(bool, InlineAccessors, true, \ 2035 "inline accessor methods (get/set)") \ 2036 \ 2037 product(bool, Inline, true, \ 2038 "enable inlining") \ 2039 \ 2040 product(bool, ClipInlining, true, \ 2041 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2042 \ 2043 develop(bool, UseCHA, true, \ 2044 "enable CHA") \ 2045 \ 2046 product(bool, UseTypeProfile, true, \ 2047 "Check interpreter profile for historically monomorphic calls") \ 2048 \ 2049 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2050 "% of major receiver type to all profiled receivers") \ 2051 \ 2052 notproduct(bool, TimeCompiler, false, \ 2053 "time the compiler") \ 2054 \ 2055 notproduct(bool, TimeCompiler2, false, \ 2056 "detailed time the compiler (requires +TimeCompiler)") \ 2057 \ 2058 diagnostic(bool, PrintInlining, false, \ 2059 "prints inlining optimizations") \ 2060 \ 2061 diagnostic(bool, PrintIntrinsics, false, \ 2062 "prints attempted and successful inlining of intrinsics") \ 2063 \ 2064 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2065 "do not expand intrinsics whose (internal) names appear here") \ 2066 \ 2067 develop(bool, StressReflectiveCode, false, \ 2068 "Use inexact types at allocations, etc., to test reflection") \ 2069 \ 2070 develop(bool, EagerInitialization, false, \ 2071 "Eagerly initialize classes if possible") \ 2072 \ 2073 product(bool, Tier1UpdateMethodData, trueInTiered, \ 2074 "Update methodDataOops in Tier1-generated code") \ 2075 \ 2076 develop(bool, TraceMethodReplacement, false, \ 2077 "Print when methods are replaced do to recompilation") \ 2078 \ 2079 develop(bool, PrintMethodFlushing, false, \ 2080 "print the nmethods being flushed") \ 2081 \ 2082 notproduct(bool, LogMultipleMutexLocking, false, \ 2083 "log locking and unlocking of mutexes (only if multiple locks " \ 2084 "are held)") \ 2085 \ 2086 develop(bool, UseRelocIndex, false, \ 2087 "use an index to speed random access to relocations") \ 2088 \ 2089 develop(bool, StressCodeBuffers, false, \ 2090 "Exercise code buffer expansion and other rare state changes") \ 2091 \ 2092 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2093 "Generate extra debugging info for non-safepoints in nmethods") \ 2094 \ 2095 diagnostic(bool, DebugInlinedCalls, true, \ 2096 "If false, restricts profiled locations to the root method only") \ 2097 \ 2098 product(bool, PrintVMOptions, trueInDebug, \ 2099 "print VM flag settings") \ 2100 \ 2101 diagnostic(bool, SerializeVMOutput, true, \ 2102 "Use a mutex to serialize output to tty and hotspot.log") \ 2103 \ 2104 diagnostic(bool, DisplayVMOutput, true, \ 2105 "Display all VM output on the tty, independently of LogVMOutput") \ 2106 \ 2107 diagnostic(bool, LogVMOutput, trueInDebug, \ 2108 "Save VM output to hotspot.log, or to LogFile") \ 2109 \ 2110 diagnostic(ccstr, LogFile, NULL, \ 2111 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2112 \ 2113 product(ccstr, ErrorFile, NULL, \ 2114 "If an error occurs, save the error data to this file " \ 2115 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2116 \ 2117 product(bool, DisplayVMOutputToStderr, false, \ 2118 "If DisplayVMOutput is true, display all VM output to stderr") \ 2119 \ 2120 product(bool, DisplayVMOutputToStdout, false, \ 2121 "If DisplayVMOutput is true, display all VM output to stdout") \ 2122 \ 2123 product(bool, UseHeavyMonitors, false, \ 2124 "use heavyweight instead of lightweight Java monitors") \ 2125 \ 2126 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2127 "print histogram of the symbol table") \ 2128 \ 2129 notproduct(bool, ExitVMOnVerifyError, false, \ 2130 "standard exit from VM if bytecode verify error " \ 2131 "(only in debug mode)") \ 2132 \ 2133 notproduct(ccstr, AbortVMOnException, NULL, \ 2134 "Call fatal if this exception is thrown. Example: " \ 2135 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2136 \ 2137 develop(bool, DebugVtables, false, \ 2138 "add debugging code to vtable dispatch") \ 2139 \ 2140 develop(bool, PrintVtables, false, \ 2141 "print vtables when printing klass") \ 2142 \ 2143 notproduct(bool, PrintVtableStats, false, \ 2144 "print vtables stats at end of run") \ 2145 \ 2146 develop(bool, TraceCreateZombies, false, \ 2147 "trace creation of zombie nmethods") \ 2148 \ 2149 notproduct(bool, IgnoreLockingAssertions, false, \ 2150 "disable locking assertions (for speed)") \ 2151 \ 2152 notproduct(bool, VerifyLoopOptimizations, false, \ 2153 "verify major loop optimizations") \ 2154 \ 2155 product(bool, RangeCheckElimination, true, \ 2156 "Split loop iterations to eliminate range checks") \ 2157 \ 2158 develop_pd(bool, UncommonNullCast, \ 2159 "track occurrences of null in casts; adjust compiler tactics") \ 2160 \ 2161 develop(bool, TypeProfileCasts, true, \ 2162 "treat casts like calls for purposes of type profiling") \ 2163 \ 2164 develop(bool, MonomorphicArrayCheck, true, \ 2165 "Uncommon-trap array store checks that require full type check") \ 2166 \ 2167 develop(bool, DelayCompilationDuringStartup, true, \ 2168 "Delay invoking the compiler until main application class is " \ 2169 "loaded") \ 2170 \ 2171 develop(bool, CompileTheWorld, false, \ 2172 "Compile all methods in all classes in bootstrap class path " \ 2173 "(stress test)") \ 2174 \ 2175 develop(bool, CompileTheWorldPreloadClasses, true, \ 2176 "Preload all classes used by a class before start loading") \ 2177 \ 2178 notproduct(bool, CompileTheWorldIgnoreInitErrors, false, \ 2179 "Compile all methods although class initializer failed") \ 2180 \ 2181 develop(bool, TraceIterativeGVN, false, \ 2182 "Print progress during Iterative Global Value Numbering") \ 2183 \ 2184 develop(bool, FillDelaySlots, true, \ 2185 "Fill delay slots (on SPARC only)") \ 2186 \ 2187 develop(bool, VerifyIterativeGVN, false, \ 2188 "Verify Def-Use modifications during sparse Iterative Global " \ 2189 "Value Numbering") \ 2190 \ 2191 notproduct(bool, TracePhaseCCP, false, \ 2192 "Print progress during Conditional Constant Propagation") \ 2193 \ 2194 develop(bool, TimeLivenessAnalysis, false, \ 2195 "Time computation of bytecode liveness analysis") \ 2196 \ 2197 develop(bool, TraceLivenessGen, false, \ 2198 "Trace the generation of liveness analysis information") \ 2199 \ 2200 notproduct(bool, TraceLivenessQuery, false, \ 2201 "Trace queries of liveness analysis information") \ 2202 \ 2203 notproduct(bool, CollectIndexSetStatistics, false, \ 2204 "Collect information about IndexSets") \ 2205 \ 2206 develop(bool, PrintDominators, false, \ 2207 "Print out dominator trees for GVN") \ 2208 \ 2209 develop(bool, UseLoopSafepoints, true, \ 2210 "Generate Safepoint nodes in every loop") \ 2211 \ 2212 notproduct(bool, TraceCISCSpill, false, \ 2213 "Trace allocators use of cisc spillable instructions") \ 2214 \ 2215 notproduct(bool, TraceSpilling, false, \ 2216 "Trace spilling") \ 2217 \ 2218 develop(bool, DeutschShiffmanExceptions, true, \ 2219 "Fast check to find exception handler for precisely typed " \ 2220 "exceptions") \ 2221 \ 2222 product(bool, SplitIfBlocks, true, \ 2223 "Clone compares and control flow through merge points to fold " \ 2224 "some branches") \ 2225 \ 2226 develop(intx, FastAllocateSizeLimit, 128*K, \ 2227 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2228 "Inline allocations larger than this in doublewords must go slow")\ 2229 \ 2230 product(bool, AggressiveOpts, false, \ 2231 "Enable aggressive optimizations - see arguments.cpp") \ 2232 \ 2233 /* statistics */ \ 2234 develop(bool, UseVTune, false, \ 2235 "enable support for Intel's VTune profiler") \ 2236 \ 2237 develop(bool, CountCompiledCalls, false, \ 2238 "counts method invocations") \ 2239 \ 2240 notproduct(bool, CountRuntimeCalls, false, \ 2241 "counts VM runtime calls") \ 2242 \ 2243 develop(bool, CountJNICalls, false, \ 2244 "counts jni method invocations") \ 2245 \ 2246 notproduct(bool, CountJVMCalls, false, \ 2247 "counts jvm method invocations") \ 2248 \ 2249 notproduct(bool, CountRemovableExceptions, false, \ 2250 "count exceptions that could be replaced by branches due to " \ 2251 "inlining") \ 2252 \ 2253 notproduct(bool, ICMissHistogram, false, \ 2254 "produce histogram of IC misses") \ 2255 \ 2256 notproduct(bool, PrintClassStatistics, false, \ 2257 "prints class statistics at end of run") \ 2258 \ 2259 notproduct(bool, PrintMethodStatistics, false, \ 2260 "prints method statistics at end of run") \ 2261 \ 2262 /* interpreter */ \ 2263 develop(bool, ClearInterpreterLocals, false, \ 2264 "Always clear local variables of interpreter activations upon " \ 2265 "entry") \ 2266 \ 2267 product_pd(bool, RewriteBytecodes, \ 2268 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2269 \ 2270 product_pd(bool, RewriteFrequentPairs, \ 2271 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2272 \ 2273 diagnostic(bool, PrintInterpreter, false, \ 2274 "Prints the generated interpreter code") \ 2275 \ 2276 product(bool, UseInterpreter, true, \ 2277 "Use interpreter for non-compiled methods") \ 2278 \ 2279 develop(bool, UseFastSignatureHandlers, true, \ 2280 "Use fast signature handlers for native calls") \ 2281 \ 2282 develop(bool, UseV8InstrsOnly, false, \ 2283 "Use SPARC-V8 Compliant instruction subset") \ 2284 \ 2285 product(bool, UseNiagaraInstrs, false, \ 2286 "Use Niagara-efficient instruction subset") \ 2287 \ 2288 develop(bool, UseCASForSwap, false, \ 2289 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2290 \ 2291 product(bool, UseLoopCounter, true, \ 2292 "Increment invocation counter on backward branch") \ 2293 \ 2294 product(bool, UseFastEmptyMethods, true, \ 2295 "Use fast method entry code for empty methods") \ 2296 \ 2297 product(bool, UseFastAccessorMethods, true, \ 2298 "Use fast method entry code for accessor methods") \ 2299 \ 2300 product_pd(bool, UseOnStackReplacement, \ 2301 "Use on stack replacement, calls runtime if invoc. counter " \ 2302 "overflows in loop") \ 2303 \ 2304 notproduct(bool, TraceOnStackReplacement, false, \ 2305 "Trace on stack replacement") \ 2306 \ 2307 develop(bool, PoisonOSREntry, true, \ 2308 "Detect abnormal calls to OSR code") \ 2309 \ 2310 product_pd(bool, PreferInterpreterNativeStubs, \ 2311 "Use always interpreter stubs for native methods invoked via " \ 2312 "interpreter") \ 2313 \ 2314 develop(bool, CountBytecodes, false, \ 2315 "Count number of bytecodes executed") \ 2316 \ 2317 develop(bool, PrintBytecodeHistogram, false, \ 2318 "Print histogram of the executed bytecodes") \ 2319 \ 2320 develop(bool, PrintBytecodePairHistogram, false, \ 2321 "Print histogram of the executed bytecode pairs") \ 2322 \ 2323 diagnostic(bool, PrintSignatureHandlers, false, \ 2324 "Print code generated for native method signature handlers") \ 2325 \ 2326 develop(bool, VerifyOops, false, \ 2327 "Do plausibility checks for oops") \ 2328 \ 2329 develop(bool, CheckUnhandledOops, false, \ 2330 "Check for unhandled oops in VM code") \ 2331 \ 2332 develop(bool, VerifyJNIFields, trueInDebug, \ 2333 "Verify jfieldIDs for instance fields") \ 2334 \ 2335 notproduct(bool, VerifyJNIEnvThread, false, \ 2336 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2337 "from JNI") \ 2338 \ 2339 develop(bool, VerifyFPU, false, \ 2340 "Verify FPU state (check for NaN's, etc.)") \ 2341 \ 2342 develop(bool, VerifyThread, false, \ 2343 "Watch the thread register for corruption (SPARC only)") \ 2344 \ 2345 develop(bool, VerifyActivationFrameSize, false, \ 2346 "Verify that activation frame didn't become smaller than its " \ 2347 "minimal size") \ 2348 \ 2349 develop(bool, TraceFrequencyInlining, false, \ 2350 "Trace frequency based inlining") \ 2351 \ 2352 notproduct(bool, TraceTypeProfile, false, \ 2353 "Trace type profile") \ 2354 \ 2355 develop_pd(bool, InlineIntrinsics, \ 2356 "Inline intrinsics that can be statically resolved") \ 2357 \ 2358 product_pd(bool, ProfileInterpreter, \ 2359 "Profile at the bytecode level during interpretation") \ 2360 \ 2361 develop_pd(bool, ProfileTraps, \ 2362 "Profile deoptimization traps at the bytecode level") \ 2363 \ 2364 product(intx, ProfileMaturityPercentage, 20, \ 2365 "number of method invocations/branches (expressed as % of " \ 2366 "CompileThreshold) before using the method's profile") \ 2367 \ 2368 develop(bool, PrintMethodData, false, \ 2369 "Print the results of +ProfileInterpreter at end of run") \ 2370 \ 2371 develop(bool, VerifyDataPointer, trueInDebug, \ 2372 "Verify the method data pointer during interpreter profiling") \ 2373 \ 2374 develop(bool, VerifyCompiledCode, false, \ 2375 "Include miscellaneous runtime verifications in nmethod code; " \ 2376 "off by default because it disturbs nmethod size heuristics.") \ 2377 \ 2378 \ 2379 /* compilation */ \ 2380 product(bool, UseCompiler, true, \ 2381 "use compilation") \ 2382 \ 2383 develop(bool, TraceCompilationPolicy, false, \ 2384 "Trace compilation policy") \ 2385 \ 2386 develop(bool, TimeCompilationPolicy, false, \ 2387 "Time the compilation policy") \ 2388 \ 2389 product(bool, UseCounterDecay, true, \ 2390 "adjust recompilation counters") \ 2391 \ 2392 develop(intx, CounterHalfLifeTime, 30, \ 2393 "half-life time of invocation counters (in secs)") \ 2394 \ 2395 develop(intx, CounterDecayMinIntervalLength, 500, \ 2396 "Min. ms. between invocation of CounterDecay") \ 2397 \ 2398 product(bool, AlwaysCompileLoopMethods, false, \ 2399 "when using recompilation, never interpret methods " \ 2400 "containing loops") \ 2401 \ 2402 product(bool, DontCompileHugeMethods, true, \ 2403 "don't compile methods > HugeMethodLimit") \ 2404 \ 2405 /* Bytecode escape analysis estimation. */ \ 2406 product(bool, EstimateArgEscape, true, \ 2407 "Analyze bytecodes to estimate escape state of arguments") \ 2408 \ 2409 product(intx, BCEATraceLevel, 0, \ 2410 "How much tracing to do of bytecode escape analysis estimates") \ 2411 \ 2412 product(intx, MaxBCEAEstimateLevel, 5, \ 2413 "Maximum number of nested calls that are analyzed by BC EA.") \ 2414 \ 2415 product(intx, MaxBCEAEstimateSize, 150, \ 2416 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2417 \ 2418 product(intx, AllocatePrefetchStyle, 1, \ 2419 "0 = no prefetch, " \ 2420 "1 = prefetch instructions for each allocation, " \ 2421 "2 = use TLAB watermark to gate allocation prefetch") \ 2422 \ 2423 product(intx, AllocatePrefetchDistance, -1, \ 2424 "Distance to prefetch ahead of allocation pointer") \ 2425 \ 2426 product(intx, AllocatePrefetchLines, 1, \ 2427 "Number of lines to prefetch ahead of allocation pointer") \ 2428 \ 2429 product(intx, AllocatePrefetchStepSize, 16, \ 2430 "Step size in bytes of sequential prefetch instructions") \ 2431 \ 2432 product(intx, AllocatePrefetchInstr, 0, \ 2433 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2434 \ 2435 product(intx, ReadPrefetchInstr, 0, \ 2436 "Prefetch instruction to prefetch ahead") \ 2437 \ 2438 /* deoptimization */ \ 2439 develop(bool, TraceDeoptimization, false, \ 2440 "Trace deoptimization") \ 2441 \ 2442 develop(bool, DebugDeoptimization, false, \ 2443 "Tracing various information while debugging deoptimization") \ 2444 \ 2445 product(intx, SelfDestructTimer, 0, \ 2446 "Will cause VM to terminate after a given time (in minutes) " \ 2447 "(0 means off)") \ 2448 \ 2449 product(intx, MaxJavaStackTraceDepth, 1024, \ 2450 "Max. no. of lines in the stack trace for Java exceptions " \ 2451 "(0 means all)") \ 2452 \ 2453 develop(intx, GuaranteedSafepointInterval, 1000, \ 2454 "Guarantee a safepoint (at least) every so many milliseconds " \ 2455 "(0 means none)") \ 2456 \ 2457 product(intx, SafepointTimeoutDelay, 10000, \ 2458 "Delay in milliseconds for option SafepointTimeout") \ 2459 \ 2460 product(intx, NmethodSweepFraction, 4, \ 2461 "Number of invocations of sweeper to cover all nmethods") \ 2462 \ 2463 notproduct(intx, MemProfilingInterval, 500, \ 2464 "Time between each invocation of the MemProfiler") \ 2465 \ 2466 develop(intx, MallocCatchPtr, -1, \ 2467 "Hit breakpoint when mallocing/freeing this pointer") \ 2468 \ 2469 notproduct(intx, AssertRepeat, 1, \ 2470 "number of times to evaluate expression in assert " \ 2471 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2472 \ 2473 notproduct(ccstrlist, SuppressErrorAt, "", \ 2474 "List of assertions (file:line) to muzzle") \ 2475 \ 2476 notproduct(uintx, HandleAllocationLimit, 1024, \ 2477 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2478 "is used") \ 2479 \ 2480 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2481 "Threshold for total handle allocation when " \ 2482 "+TraceHandleAllocation is used") \ 2483 \ 2484 develop(intx, StackPrintLimit, 100, \ 2485 "number of stack frames to print in VM-level stack dump") \ 2486 \ 2487 notproduct(intx, MaxElementPrintSize, 256, \ 2488 "maximum number of elements to print") \ 2489 \ 2490 notproduct(intx, MaxSubklassPrintSize, 4, \ 2491 "maximum number of subklasses to print when printing klass") \ 2492 \ 2493 develop(intx, MaxInlineLevel, 9, \ 2494 "maximum number of nested calls that are inlined") \ 2495 \ 2496 develop(intx, MaxRecursiveInlineLevel, 1, \ 2497 "maximum number of nested recursive calls that are inlined") \ 2498 \ 2499 develop(intx, InlineSmallCode, 1000, \ 2500 "Only inline already compiled methods if their code size is " \ 2501 "less than this") \ 2502 \ 2503 product(intx, MaxInlineSize, 35, \ 2504 "maximum bytecode size of a method to be inlined") \ 2505 \ 2506 product_pd(intx, FreqInlineSize, \ 2507 "maximum bytecode size of a frequent method to be inlined") \ 2508 \ 2509 develop(intx, MaxTrivialSize, 6, \ 2510 "maximum bytecode size of a trivial method to be inlined") \ 2511 \ 2512 develop(intx, MinInliningThreshold, 250, \ 2513 "min. invocation count a method needs to have to be inlined") \ 2514 \ 2515 develop(intx, AlignEntryCode, 4, \ 2516 "aligns entry code to specified value (in bytes)") \ 2517 \ 2518 develop(intx, MethodHistogramCutoff, 100, \ 2519 "cutoff value for method invoc. histogram (+CountCalls)") \ 2520 \ 2521 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2522 "# of interpreted methods to show in profile") \ 2523 \ 2524 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2525 "# of compiled methods to show in profile") \ 2526 \ 2527 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2528 "# of stub methods to show in profile") \ 2529 \ 2530 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2531 "# of runtime stub nodes to show in profile") \ 2532 \ 2533 product(intx, ProfileIntervalsTicks, 100, \ 2534 "# of ticks between printing of interval profile " \ 2535 "(+ProfileIntervals)") \ 2536 \ 2537 notproduct(intx, ScavengeALotInterval, 1, \ 2538 "Interval between which scavenge will occur with +ScavengeALot") \ 2539 \ 2540 notproduct(intx, FullGCALotInterval, 1, \ 2541 "Interval between which full gc will occur with +FullGCALot") \ 2542 \ 2543 notproduct(intx, FullGCALotStart, 0, \ 2544 "For which invocation to start FullGCAlot") \ 2545 \ 2546 notproduct(intx, FullGCALotDummies, 32*K, \ 2547 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2548 "to move") \ 2549 \ 2550 develop(intx, DontYieldALotInterval, 10, \ 2551 "Interval between which yields will be dropped (milliseconds)") \ 2552 \ 2553 develop(intx, MinSleepInterval, 1, \ 2554 "Minimum sleep() interval (milliseconds) when " \ 2555 "ConvertSleepToYield is off (used for SOLARIS)") \ 2556 \ 2557 product(intx, EventLogLength, 2000, \ 2558 "maximum nof events in event log") \ 2559 \ 2560 develop(intx, ProfilerPCTickThreshold, 15, \ 2561 "Number of ticks in a PC buckets to be a hotspot") \ 2562 \ 2563 notproduct(intx, DeoptimizeALotInterval, 5, \ 2564 "Number of exits until DeoptimizeALot kicks in") \ 2565 \ 2566 notproduct(intx, ZombieALotInterval, 5, \ 2567 "Number of exits until ZombieALot kicks in") \ 2568 \ 2569 develop(bool, StressNonEntrant, false, \ 2570 "Mark nmethods non-entrant at registration") \ 2571 \ 2572 diagnostic(intx, MallocVerifyInterval, 0, \ 2573 "if non-zero, verify C heap after every N calls to " \ 2574 "malloc/realloc/free") \ 2575 \ 2576 diagnostic(intx, MallocVerifyStart, 0, \ 2577 "if non-zero, start verifying C heap after Nth call to " \ 2578 "malloc/realloc/free") \ 2579 \ 2580 product(intx, TypeProfileWidth, 2, \ 2581 "number of receiver types to record in call/cast profile") \ 2582 \ 2583 develop(intx, BciProfileWidth, 2, \ 2584 "number of return bci's to record in ret profile") \ 2585 \ 2586 product(intx, PerMethodRecompilationCutoff, 400, \ 2587 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2588 \ 2589 product(intx, PerBytecodeRecompilationCutoff, 100, \ 2590 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2591 \ 2592 product(intx, PerMethodTrapLimit, 100, \ 2593 "Limit on traps (of one kind) in a method (includes inlines)") \ 2594 \ 2595 product(intx, PerBytecodeTrapLimit, 4, \ 2596 "Limit on traps (of one kind) at a particular BCI") \ 2597 \ 2598 develop(intx, FreqCountInvocations, 1, \ 2599 "Scaling factor for branch frequencies (deprecated)") \ 2600 \ 2601 develop(intx, InlineFrequencyRatio, 20, \ 2602 "Ratio of call site execution to caller method invocation") \ 2603 \ 2604 develop_pd(intx, InlineFrequencyCount, \ 2605 "Count of call site execution necessary to trigger frequent " \ 2606 "inlining") \ 2607 \ 2608 develop(intx, InlineThrowCount, 50, \ 2609 "Force inlining of interpreted methods that throw this often") \ 2610 \ 2611 develop(intx, InlineThrowMaxSize, 200, \ 2612 "Force inlining of throwing methods smaller than this") \ 2613 \ 2614 product(intx, AliasLevel, 3, \ 2615 "0 for no aliasing, 1 for oop/field/static/array split, " \ 2616 "2 for class split, 3 for unique instances") \ 2617 \ 2618 develop(bool, VerifyAliases, false, \ 2619 "perform extra checks on the results of alias analysis") \ 2620 \ 2621 develop(intx, ProfilerNodeSize, 1024, \ 2622 "Size in K to allocate for the Profile Nodes of each thread") \ 2623 \ 2624 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 2625 "Number of times to spin wait on a v8 atomic operation lock") \ 2626 \ 2627 product(intx, ReadSpinIterations, 100, \ 2628 "Number of read attempts before a yield (spin inner loop)") \ 2629 \ 2630 product_pd(intx, PreInflateSpin, \ 2631 "Number of times to spin wait before inflation") \ 2632 \ 2633 product(intx, PreBlockSpin, 10, \ 2634 "Number of times to spin in an inflated lock before going to " \ 2635 "an OS lock") \ 2636 \ 2637 /* gc parameters */ \ 2638 product(uintx, MaxHeapSize, ScaleForWordSize(64*M), \ 2639 "Default maximum size for object heap (in bytes)") \ 2640 \ 2641 product_pd(uintx, NewSize, \ 2642 "Default size of new generation (in bytes)") \ 2643 \ 2644 product(uintx, MaxNewSize, max_uintx, \ 2645 "Maximum size of new generation (in bytes)") \ 2646 \ 2647 product(uintx, PretenureSizeThreshold, 0, \ 2648 "Max size in bytes of objects allocated in DefNew generation") \ 2649 \ 2650 product_pd(uintx, TLABSize, \ 2651 "Default (or starting) size of TLAB (in bytes)") \ 2652 \ 2653 product(uintx, MinTLABSize, 2*K, \ 2654 "Minimum allowed TLAB size (in bytes)") \ 2655 \ 2656 product(uintx, TLABAllocationWeight, 35, \ 2657 "Allocation averaging weight") \ 2658 \ 2659 product(uintx, TLABWasteTargetPercent, 1, \ 2660 "Percentage of Eden that can be wasted") \ 2661 \ 2662 product(uintx, TLABRefillWasteFraction, 64, \ 2663 "Max TLAB waste at a refill (internal fragmentation)") \ 2664 \ 2665 product(uintx, TLABWasteIncrement, 4, \ 2666 "Increment allowed waste at slow allocation") \ 2667 \ 2668 product_pd(intx, SurvivorRatio, \ 2669 "Ratio of eden/survivor space size") \ 2670 \ 2671 product_pd(intx, NewRatio, \ 2672 "Ratio of new/old generation sizes") \ 2673 \ 2674 product(uintx, MaxLiveObjectEvacuationRatio, 100, \ 2675 "Max percent of eden objects that will be live at scavenge") \ 2676 \ 2677 product_pd(uintx, NewSizeThreadIncrease, \ 2678 "Additional size added to desired new generation size per " \ 2679 "non-daemon thread (in bytes)") \ 2680 \ 2681 product(uintx, OldSize, ScaleForWordSize(4096*K), \ 2682 "Default size of tenured generation (in bytes)") \ 2683 \ 2684 product_pd(uintx, PermSize, \ 2685 "Default size of permanent generation (in bytes)") \ 2686 \ 2687 product_pd(uintx, MaxPermSize, \ 2688 "Maximum size of permanent generation (in bytes)") \ 2689 \ 2690 product(uintx, MinHeapFreeRatio, 40, \ 2691 "Min percentage of heap free after GC to avoid expansion") \ 2692 \ 2693 product(uintx, MaxHeapFreeRatio, 70, \ 2694 "Max percentage of heap free after GC to avoid shrinking") \ 2695 \ 2696 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 2697 "Number of milliseconds per MB of free space in the heap") \ 2698 \ 2699 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 2700 "Min change in heap space due to GC (in bytes)") \ 2701 \ 2702 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 2703 "Min expansion of permanent heap (in bytes)") \ 2704 \ 2705 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 2706 "Max expansion of permanent heap without full GC (in bytes)") \ 2707 \ 2708 product(intx, QueuedAllocationWarningCount, 0, \ 2709 "Number of times an allocation that queues behind a GC " \ 2710 "will retry before printing a warning") \ 2711 \ 2712 diagnostic(uintx, VerifyGCStartAt, 0, \ 2713 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 2714 \ 2715 diagnostic(intx, VerifyGCLevel, 0, \ 2716 "Generation level at which to start +VerifyBefore/AfterGC") \ 2717 \ 2718 develop(uintx, ExitAfterGCNum, 0, \ 2719 "If non-zero, exit after this GC.") \ 2720 \ 2721 product(intx, MaxTenuringThreshold, 15, \ 2722 "Maximum value for tenuring threshold") \ 2723 \ 2724 product(intx, InitialTenuringThreshold, 7, \ 2725 "Initial value for tenuring threshold") \ 2726 \ 2727 product(intx, TargetSurvivorRatio, 50, \ 2728 "Desired percentage of survivor space used after scavenge") \ 2729 \ 2730 product(intx, MarkSweepDeadRatio, 5, \ 2731 "Percentage (0-100) of the old gen allowed as dead wood." \ 2732 "Serial mark sweep treats this as both the min and max value." \ 2733 "CMS uses this value only if it falls back to mark sweep." \ 2734 "Par compact uses a variable scale based on the density of the" \ 2735 "generation and treats this as the max value when the heap is" \ 2736 "either completely full or completely empty. Par compact also" \ 2737 "has a smaller default value; see arguments.cpp.") \ 2738 \ 2739 product(intx, PermMarkSweepDeadRatio, 20, \ 2740 "Percentage (0-100) of the perm gen allowed as dead wood." \ 2741 "See MarkSweepDeadRatio for collector-specific comments.") \ 2742 \ 2743 product(intx, MarkSweepAlwaysCompactCount, 4, \ 2744 "How often should we fully compact the heap (ignoring the dead " \ 2745 "space parameters)") \ 2746 \ 2747 product(intx, PrintCMSStatistics, 0, \ 2748 "Statistics for CMS") \ 2749 \ 2750 product(bool, PrintCMSInitiationStatistics, false, \ 2751 "Statistics for initiating a CMS collection") \ 2752 \ 2753 product(intx, PrintFLSStatistics, 0, \ 2754 "Statistics for CMS' FreeListSpace") \ 2755 \ 2756 product(intx, PrintFLSCensus, 0, \ 2757 "Census for CMS' FreeListSpace") \ 2758 \ 2759 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 2760 "Delay in ms between expansion and allocation") \ 2761 \ 2762 product(intx, DeferThrSuspendLoopCount, 4000, \ 2763 "(Unstable) Number of times to iterate in safepoint loop " \ 2764 " before blocking VM threads ") \ 2765 \ 2766 product(intx, DeferPollingPageLoopCount, -1, \ 2767 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 2768 "before changing safepoint polling page to RO ") \ 2769 \ 2770 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 2771 \ 2772 product(bool, UseDepthFirstScavengeOrder, true, \ 2773 "true: the scavenge order will be depth-first, " \ 2774 "false: the scavenge order will be breadth-first") \ 2775 \ 2776 product(bool, PSChunkLargeArrays, true, \ 2777 "true: process large arrays in chunks") \ 2778 \ 2779 product(uintx, GCDrainStackTargetSize, 64, \ 2780 "how many entries we'll try to leave on the stack during " \ 2781 "parallel GC") \ 2782 \ 2783 /* stack parameters */ \ 2784 product_pd(intx, StackYellowPages, \ 2785 "Number of yellow zone (recoverable overflows) pages") \ 2786 \ 2787 product_pd(intx, StackRedPages, \ 2788 "Number of red zone (unrecoverable overflows) pages") \ 2789 \ 2790 product_pd(intx, StackShadowPages, \ 2791 "Number of shadow zone (for overflow checking) pages" \ 2792 " this should exceed the depth of the VM and native call stack") \ 2793 \ 2794 product_pd(intx, ThreadStackSize, \ 2795 "Thread Stack Size (in Kbytes)") \ 2796 \ 2797 product_pd(intx, VMThreadStackSize, \ 2798 "Non-Java Thread Stack Size (in Kbytes)") \ 2799 \ 2800 product_pd(intx, CompilerThreadStackSize, \ 2801 "Compiler Thread Stack Size (in Kbytes)") \ 2802 \ 2803 develop_pd(uintx, JVMInvokeMethodSlack, \ 2804 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 2805 \ 2806 product(uintx, ThreadSafetyMargin, 50*M, \ 2807 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 2808 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 2809 "disable this feature") \ 2810 \ 2811 /* code cache parameters */ \ 2812 develop(uintx, CodeCacheSegmentSize, 64, \ 2813 "Code cache segment size (in bytes) - smallest unit of " \ 2814 "allocation") \ 2815 \ 2816 develop_pd(intx, CodeEntryAlignment, \ 2817 "Code entry alignment for generated code (in bytes)") \ 2818 \ 2819 product_pd(uintx, InitialCodeCacheSize, \ 2820 "Initial code cache size (in bytes)") \ 2821 \ 2822 product_pd(uintx, ReservedCodeCacheSize, \ 2823 "Reserved code cache size (in bytes) - maximum code cache size") \ 2824 \ 2825 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 2826 "When less than X space left, we stop compiling.") \ 2827 \ 2828 product_pd(uintx, CodeCacheExpansionSize, \ 2829 "Code cache expansion size (in bytes)") \ 2830 \ 2831 develop_pd(uintx, CodeCacheMinBlockLength, \ 2832 "Minimum number of segments in a code cache block.") \ 2833 \ 2834 notproduct(bool, ExitOnFullCodeCache, false, \ 2835 "Exit the VM if we fill the code cache.") \ 2836 \ 2837 /* interpreter debugging */ \ 2838 develop(intx, BinarySwitchThreshold, 5, \ 2839 "Minimal number of lookupswitch entries for rewriting to binary " \ 2840 "switch") \ 2841 \ 2842 develop(intx, StopInterpreterAt, 0, \ 2843 "Stops interpreter execution at specified bytecode number") \ 2844 \ 2845 develop(intx, TraceBytecodesAt, 0, \ 2846 "Traces bytecodes starting with specified bytecode number") \ 2847 \ 2848 /* compiler interface */ \ 2849 develop(intx, CIStart, 0, \ 2850 "the id of the first compilation to permit") \ 2851 \ 2852 develop(intx, CIStop, -1, \ 2853 "the id of the last compilation to permit") \ 2854 \ 2855 develop(intx, CIStartOSR, 0, \ 2856 "the id of the first osr compilation to permit " \ 2857 "(CICountOSR must be on)") \ 2858 \ 2859 develop(intx, CIStopOSR, -1, \ 2860 "the id of the last osr compilation to permit " \ 2861 "(CICountOSR must be on)") \ 2862 \ 2863 develop(intx, CIBreakAtOSR, -1, \ 2864 "id of osr compilation to break at") \ 2865 \ 2866 develop(intx, CIBreakAt, -1, \ 2867 "id of compilation to break at") \ 2868 \ 2869 product(ccstrlist, CompileOnly, "", \ 2870 "List of methods (pkg/class.name) to restrict compilation to") \ 2871 \ 2872 product(ccstr, CompileCommandFile, NULL, \ 2873 "Read compiler commands from this file [.hotspot_compiler]") \ 2874 \ 2875 product(ccstrlist, CompileCommand, "", \ 2876 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 2877 \ 2878 product(bool, CICompilerCountPerCPU, false, \ 2879 "1 compiler thread for log(N CPUs)") \ 2880 \ 2881 develop(intx, CIFireOOMAt, -1, \ 2882 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 2883 "(non-negative value throws OOM after this many CI accesses " \ 2884 "in each compile)") \ 2885 \ 2886 develop(intx, CIFireOOMAtDelay, -1, \ 2887 "Wait for this many CI accesses to occur in all compiles before " \ 2888 "beginning to throw OutOfMemoryErrors in each compile") \ 2889 \ 2890 /* Priorities */ \ 2891 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 2892 \ 2893 product(intx, ThreadPriorityPolicy, 0, \ 2894 "0 : Normal. "\ 2895 " VM chooses priorities that are appropriate for normal "\ 2896 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 2897 " to normal native priority. Java priorities below NORM_PRIORITY"\ 2898 " map to lower native priority values. On Windows applications"\ 2899 " are allowed to use higher native priorities. However, with "\ 2900 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 2901 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 2902 " interfere with system threads. On Linux thread priorities "\ 2903 " are ignored because the OS does not support static priority "\ 2904 " in SCHED_OTHER scheduling class which is the only choice for"\ 2905 " non-root, non-realtime applications. "\ 2906 "1 : Aggressive. "\ 2907 " Java thread priorities map over to the entire range of "\ 2908 " native thread priorities. Higher Java thread priorities map "\ 2909 " to higher native thread priorities. This policy should be "\ 2910 " used with care, as sometimes it can cause performance "\ 2911 " degradation in the application and/or the entire system. On "\ 2912 " Linux this policy requires root privilege.") \ 2913 \ 2914 product(bool, ThreadPriorityVerbose, false, \ 2915 "print priority changes") \ 2916 \ 2917 product(intx, DefaultThreadPriority, -1, \ 2918 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 2919 \ 2920 product(intx, CompilerThreadPriority, -1, \ 2921 "what priority should compiler threads run at (-1 means no change)") \ 2922 \ 2923 product(intx, VMThreadPriority, -1, \ 2924 "what priority should VM threads run at (-1 means no change)") \ 2925 \ 2926 product(bool, CompilerThreadHintNoPreempt, true, \ 2927 "(Solaris only) Give compiler threads an extra quanta") \ 2928 \ 2929 product(bool, VMThreadHintNoPreempt, false, \ 2930 "(Solaris only) Give VM thread an extra quanta") \ 2931 \ 2932 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2933 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2934 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2935 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2936 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2937 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2938 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2939 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2940 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 2941 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 2942 \ 2943 /* compiler debugging */ \ 2944 notproduct(intx, CompileTheWorldStartAt, 1, \ 2945 "First class to consider when using +CompileTheWorld") \ 2946 \ 2947 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 2948 "Last class to consider when using +CompileTheWorld") \ 2949 \ 2950 develop(intx, NewCodeParameter, 0, \ 2951 "Testing Only: Create a dedicated integer parameter before " \ 2952 "putback") \ 2953 \ 2954 /* new oopmap storage allocation */ \ 2955 develop(intx, MinOopMapAllocation, 8, \ 2956 "Minimum number of OopMap entries in an OopMapSet") \ 2957 \ 2958 /* Background Compilation */ \ 2959 develop(intx, LongCompileThreshold, 50, \ 2960 "Used with +TraceLongCompiles") \ 2961 \ 2962 product(intx, StarvationMonitorInterval, 200, \ 2963 "Pause between each check in ms") \ 2964 \ 2965 /* recompilation */ \ 2966 product_pd(intx, CompileThreshold, \ 2967 "number of interpreted method invocations before (re-)compiling") \ 2968 \ 2969 product_pd(intx, BackEdgeThreshold, \ 2970 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 2971 \ 2972 product(intx, Tier1BytecodeLimit, 10, \ 2973 "Must have at least this many bytecodes before tier1" \ 2974 "invocation counters are used") \ 2975 \ 2976 product_pd(intx, Tier2CompileThreshold, \ 2977 "threshold at which a tier 2 compilation is invoked") \ 2978 \ 2979 product_pd(intx, Tier2BackEdgeThreshold, \ 2980 "Back edge threshold at which a tier 2 compilation is invoked") \ 2981 \ 2982 product_pd(intx, Tier3CompileThreshold, \ 2983 "threshold at which a tier 3 compilation is invoked") \ 2984 \ 2985 product_pd(intx, Tier3BackEdgeThreshold, \ 2986 "Back edge threshold at which a tier 3 compilation is invoked") \ 2987 \ 2988 product_pd(intx, Tier4CompileThreshold, \ 2989 "threshold at which a tier 4 compilation is invoked") \ 2990 \ 2991 product_pd(intx, Tier4BackEdgeThreshold, \ 2992 "Back edge threshold at which a tier 4 compilation is invoked") \ 2993 \ 2994 product_pd(bool, TieredCompilation, \ 2995 "Enable two-tier compilation") \ 2996 \ 2997 product(bool, StressTieredRuntime, false, \ 2998 "Alternate client and server compiler on compile requests") \ 2999 \ 3000 product_pd(intx, OnStackReplacePercentage, \ 3001 "NON_TIERED number of method invocations/branches (expressed as %"\ 3002 "of CompileThreshold) before (re-)compiling OSR code") \ 3003 \ 3004 product(intx, InterpreterProfilePercentage, 33, \ 3005 "NON_TIERED number of method invocations/branches (expressed as %"\ 3006 "of CompileThreshold) before profiling in the interpreter") \ 3007 \ 3008 develop(intx, MaxRecompilationSearchLength, 10, \ 3009 "max. # frames to inspect searching for recompilee") \ 3010 \ 3011 develop(intx, MaxInterpretedSearchLength, 3, \ 3012 "max. # interp. frames to skip when searching for recompilee") \ 3013 \ 3014 develop(intx, DesiredMethodLimit, 8000, \ 3015 "desired max. method size (in bytecodes) after inlining") \ 3016 \ 3017 develop(intx, HugeMethodLimit, 8000, \ 3018 "don't compile methods larger than this if " \ 3019 "+DontCompileHugeMethods") \ 3020 \ 3021 /* New JDK 1.4 reflection implementation */ \ 3022 \ 3023 develop(bool, UseNewReflection, true, \ 3024 "Temporary flag for transition to reflection based on dynamic " \ 3025 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3026 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3027 "changes were needed") \ 3028 \ 3029 develop(bool, VerifyReflectionBytecodes, false, \ 3030 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3031 "in situations like that described in 4486457 or for " \ 3032 "constructors generated for serialization, so can not be enabled "\ 3033 "in product.") \ 3034 \ 3035 product(bool, ReflectionWrapResolutionErrors, true, \ 3036 "Temporary flag for transition to AbstractMethodError wrapped " \ 3037 "in InvocationTargetException. See 6531596") \ 3038 \ 3039 \ 3040 develop(intx, FastSuperclassLimit, 8, \ 3041 "Depth of hardwired instanceof accelerator array") \ 3042 \ 3043 /* Properties for Java libraries */ \ 3044 \ 3045 product(intx, MaxDirectMemorySize, -1, \ 3046 "Maximum total size of NIO direct-buffer allocations") \ 3047 \ 3048 /* temporary developer defined flags */ \ 3049 \ 3050 diagnostic(bool, UseNewCode, false, \ 3051 "Testing Only: Use the new version while testing") \ 3052 \ 3053 diagnostic(bool, UseNewCode2, false, \ 3054 "Testing Only: Use the new version while testing") \ 3055 \ 3056 diagnostic(bool, UseNewCode3, false, \ 3057 "Testing Only: Use the new version while testing") \ 3058 \ 3059 /* flags for performance data collection */ \ 3060 \ 3061 product(bool, UsePerfData, true, \ 3062 "Flag to disable jvmstat instrumentation for performance testing" \ 3063 "and problem isolation purposes.") \ 3064 \ 3065 product(bool, PerfDataSaveToFile, false, \ 3066 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3067 \ 3068 product(ccstr, PerfDataSaveFile, NULL, \ 3069 "Save PerfData memory to the specified absolute pathname," \ 3070 "%p in the file name if present will be replaced by pid") \ 3071 \ 3072 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3073 "Data sampling interval in milliseconds") \ 3074 \ 3075 develop(bool, PerfTraceDataCreation, false, \ 3076 "Trace creation of Performance Data Entries") \ 3077 \ 3078 develop(bool, PerfTraceMemOps, false, \ 3079 "Trace PerfMemory create/attach/detach calls") \ 3080 \ 3081 product(bool, PerfDisableSharedMem, false, \ 3082 "Store performance data in standard memory") \ 3083 \ 3084 product(intx, PerfDataMemorySize, 32*K, \ 3085 "Size of performance data memory region. Will be rounded " \ 3086 "up to a multiple of the native os page size.") \ 3087 \ 3088 product(intx, PerfMaxStringConstLength, 1024, \ 3089 "Maximum PerfStringConstant string length before truncation") \ 3090 \ 3091 product(bool, PerfAllowAtExitRegistration, false, \ 3092 "Allow registration of atexit() methods") \ 3093 \ 3094 product(bool, PerfBypassFileSystemCheck, false, \ 3095 "Bypass Win32 file system criteria checks (Windows Only)") \ 3096 \ 3097 product(intx, UnguardOnExecutionViolation, 0, \ 3098 "Unguard page and retry on no-execute fault (Win32 only)" \ 3099 "0=off, 1=conservative, 2=aggressive") \ 3100 \ 3101 /* Serviceability Support */ \ 3102 \ 3103 product(bool, ManagementServer, false, \ 3104 "Create JMX Management Server") \ 3105 \ 3106 product(bool, DisableAttachMechanism, false, \ 3107 "Disable mechanism that allows tools to attach to this VM") \ 3108 \ 3109 product(bool, StartAttachListener, false, \ 3110 "Always start Attach Listener at VM startup") \ 3111 \ 3112 manageable(bool, PrintConcurrentLocks, false, \ 3113 "Print java.util.concurrent locks in thread dump") \ 3114 \ 3115 /* Shared spaces */ \ 3116 \ 3117 product(bool, UseSharedSpaces, true, \ 3118 "Use shared spaces in the permanent generation") \ 3119 \ 3120 product(bool, RequireSharedSpaces, false, \ 3121 "Require shared spaces in the permanent generation") \ 3122 \ 3123 product(bool, ForceSharedSpaces, false, \ 3124 "Require shared spaces in the permanent generation") \ 3125 \ 3126 product(bool, DumpSharedSpaces, false, \ 3127 "Special mode: JVM reads a class list, loads classes, builds " \ 3128 "shared spaces, and dumps the shared spaces to a file to be " \ 3129 "used in future JVM runs.") \ 3130 \ 3131 product(bool, PrintSharedSpaces, false, \ 3132 "Print usage of shared spaces") \ 3133 \ 3134 product(uintx, SharedDummyBlockSize, 512*M, \ 3135 "Size of dummy block used to shift heap addresses (in bytes)") \ 3136 \ 3137 product(uintx, SharedReadWriteSize, 12*M, \ 3138 "Size of read-write space in permanent generation (in bytes)") \ 3139 \ 3140 product(uintx, SharedReadOnlySize, 8*M, \ 3141 "Size of read-only space in permanent generation (in bytes)") \ 3142 \ 3143 product(uintx, SharedMiscDataSize, 4*M, \ 3144 "Size of the shared data area adjacent to the heap (in bytes)") \ 3145 \ 3146 product(uintx, SharedMiscCodeSize, 4*M, \ 3147 "Size of the shared code area adjacent to the heap (in bytes)") \ 3148 \ 3149 diagnostic(bool, SharedOptimizeColdStart, true, \ 3150 "At dump time, order shared objects to achieve better " \ 3151 "cold startup time.") \ 3152 \ 3153 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3154 "Reordering policy for SharedOptimizeColdStart " \ 3155 "0=favor classload-time locality, 1=balanced, " \ 3156 "2=favor runtime locality") \ 3157 \ 3158 diagnostic(bool, SharedSkipVerify, false, \ 3159 "Skip assert() and verify() which page-in unwanted shared " \ 3160 "objects. ") \ 3161 \ 3162 product(bool, TaggedStackInterpreter, false, \ 3163 "Insert tags in interpreter execution stack for oopmap generaion")\ 3164 \ 3165 diagnostic(bool, PauseAtStartup, false, \ 3166 "Causes the VM to pause at startup time and wait for the pause " \ 3167 "file to be removed (default: ./vm.paused.<pid>)") \ 3168 \ 3169 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3170 "The file to create and for whose removal to await when pausing " \ 3171 "at startup. (default: ./vm.paused.<pid>)") \ 3172 \ 3173 product(bool, ExtendedDTraceProbes, false, \ 3174 "Enable performance-impacting dtrace probes") \ 3175 \ 3176 product(bool, DTraceMethodProbes, false, \ 3177 "Enable dtrace probes for method-entry and method-exit") \ 3178 \ 3179 product(bool, DTraceAllocProbes, false, \ 3180 "Enable dtrace probes for object allocation") \ 3181 \ 3182 product(bool, DTraceMonitorProbes, false, \ 3183 "Enable dtrace probes for monitor events") \ 3184 \ 3185 product(bool, RelaxAccessControlCheck, false, \ 3186 "Relax the access control checks in the verifier") \ 3187 \ 3188 product(bool, UseVMInterruptibleIO, true, \ 3189 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3190 "EINTR for I/O operations results in OS_INTRPT") 3191 3192 3193/* 3194 * Macros for factoring of globals 3195 */ 3196 3197// Interface macros 3198#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3199#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3200#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3201#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3202#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3203#ifdef PRODUCT 3204#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3205#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3206#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3207#else 3208#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3209#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3210#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3211#endif 3212 3213// Implementation macros 3214#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3215#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3216#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3217#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3218#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3219#ifdef PRODUCT 3220#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3221#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3222#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3223#else 3224#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3225#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3226#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3227#endif 3228 3229RUNTIME_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) 3230 3231RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3232