1 /* 2 * Copyright (c) 1997, 2021, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_RUNTIME_GLOBALS_HPP 26 #define SHARE_RUNTIME_GLOBALS_HPP 27 28 #include "compiler/compiler_globals_pd.hpp" 29 #include "runtime/globals_shared.hpp" 30 #include "utilities/align.hpp" 31 #include "utilities/globalDefinitions.hpp" 32 #include "utilities/macros.hpp" 33 #include CPU_HEADER(globals) 34 #include OS_HEADER(globals) 35 #include OS_CPU_HEADER(globals) 36 37 // develop flags are settable / visible only during development and are constant in the PRODUCT version 38 // product flags are always settable / visible 39 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 40 // develop_pd/product_pd flags are the same as develop/product, except that their default values 41 // are specified in platform-dependent header files. 42 43 // Flags must be declared with the following number of parameters: 44 // non-pd flags: 45 // (type, name, default_value, doc), or 46 // (type, name, default_value, extra_attrs, doc) 47 // pd flags: 48 // (type, name, doc), or 49 // (type, name, extra_attrs, doc) 50 51 // A flag must be declared with one of the following types: 52 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. 53 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used 54 // only in this file, because the macrology requires single-token type names. 55 56 // The optional extra_attrs parameter may have one of the following values: 57 // DIAGNOSTIC, EXPERIMENTAL, or MANAGEABLE. Currently extra_attrs can be used 58 // only with product/product_pd flags. 59 // 60 // DIAGNOSTIC options are not meant for VM tuning or for product modes. 61 // They are to be used for VM quality assurance or field diagnosis 62 // of VM bugs. They are hidden so that users will not be encouraged to 63 // try them as if they were VM ordinary execution options. However, they 64 // are available in the product version of the VM. Under instruction 65 // from support engineers, VM customers can turn them on to collect 66 // diagnostic information about VM problems. To use a VM diagnostic 67 // option, you must first specify +UnlockDiagnosticVMOptions. 68 // (This master switch also affects the behavior of -Xprintflags.) 69 // 70 // EXPERIMENTAL flags are in support of features that are not 71 // part of the officially supported product, but are available 72 // for experimenting with. They could, for example, be performance 73 // features that may not have undergone full or rigorous QA, but which may 74 // help performance in some cases and released for experimentation 75 // by the community of users and developers. This flag also allows one to 76 // be able to build a fully supported product that nonetheless also 77 // ships with some unsupported, lightly tested, experimental features. 78 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 79 // UnlockExperimentalVMOptions flag, which allows the control and 80 // modification of the experimental flags. 81 // 82 // Nota bene: neither diagnostic nor experimental options should be used casually, 83 // and they are not supported on production loads, except under explicit 84 // direction from support engineers. 85 // 86 // MANAGEABLE flags are writeable external product flags. 87 // They are dynamically writeable through the JDK management interface 88 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 89 // These flags are external exported interface (see CCC). The list of 90 // manageable flags can be queried programmatically through the management 91 // interface. 92 // 93 // A flag can be made as "manageable" only if 94 // - the flag is defined in a CCC as an external exported interface. 95 // - the VM implementation supports dynamic setting of the flag. 96 // This implies that the VM must *always* query the flag variable 97 // and not reuse state related to the flag state at any given time. 98 // - you want the flag to be queried programmatically by the customers. 99 // 100 101 // 102 // range is a macro that will expand to min and max arguments for range 103 // checking code if provided - see jvmFlagLimit.hpp 104 // 105 // constraint is a macro that will expand to custom function call 106 // for constraint checking if provided - see jvmFlagLimit.hpp 107 108 // Default and minimum StringTable and SymbolTable size values 109 // Must be powers of 2 110 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 111 const size_t minimumStringTableSize = 128; 112 const size_t defaultSymbolTableSize = 32768; // 2^15 113 const size_t minimumSymbolTableSize = 1024; 114 115 #ifdef _LP64 116 #define LP64_RUNTIME_FLAGS(develop, \ 117 develop_pd, \ 118 product, \ 119 product_pd, \ 120 notproduct, \ 121 range, \ 122 constraint) \ 123 \ 124 product(bool, UseCompressedOops, false, \ 125 "Use 32-bit object references in 64-bit VM. " \ 126 "lp64_product means flag is always constant in 32 bit VM") \ 127 \ 128 product(bool, UseCompressedClassPointers, true, \ 129 "Use 32-bit class pointers in 64-bit VM. " \ 130 "lp64_product means flag is always constant in 32 bit VM") \ 131 \ 132 product(bool, UseCompactObjectHeaders, true, EXPERIMENTAL, \ 133 "Use 64-bit object headers instead of 96-bit headers") \ 134 \ 135 product(intx, ObjectAlignmentInBytes, 8, \ 136 "Default object alignment in bytes, 8 is minimum") \ 137 range(8, 256) \ 138 constraint(ObjectAlignmentInBytesConstraintFunc, AtParse) 139 140 #else 141 // !_LP64 142 143 #define LP64_RUNTIME_FLAGS(develop, \ 144 develop_pd, \ 145 product, \ 146 product_pd, \ 147 notproduct, \ 148 range, \ 149 constraint) 150 const bool UseCompressedOops = false; 151 const bool UseCompressedClassPointers = false; 152 const bool UseCompactObjectHeaders = false; 153 const intx ObjectAlignmentInBytes = 8; 154 155 #endif // _LP64 156 157 #define RUNTIME_FLAGS(develop, \ 158 develop_pd, \ 159 product, \ 160 product_pd, \ 161 notproduct, \ 162 range, \ 163 constraint) \ 164 \ 165 notproduct(bool, CheckCompressedOops, true, \ 166 "Generate checks in encoding/decoding code in debug VM") \ 167 \ 168 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 169 "Heap allocation steps through preferred address regions to find" \ 170 " where it can allocate the heap. Number of steps to take per " \ 171 "region.") \ 172 range(1, max_uintx) \ 173 \ 174 product(uint, HandshakeTimeout, 0, DIAGNOSTIC, \ 175 "If nonzero set a timeout in milliseconds for handshakes") \ 176 \ 177 product(bool, AlwaysSafeConstructors, false, EXPERIMENTAL, \ 178 "Force safe construction, as if all fields are final.") \ 179 \ 180 product(bool, UnlockDiagnosticVMOptions, trueInDebug, DIAGNOSTIC, \ 181 "Enable normal processing of flags relating to field diagnostics")\ 182 \ 183 product(bool, UnlockExperimentalVMOptions, false, EXPERIMENTAL, \ 184 "Enable normal processing of flags relating to experimental " \ 185 "features") \ 186 \ 187 product(bool, JavaMonitorsInStackTrace, true, \ 188 "Print information about Java monitor locks when the stacks are " \ 189 "dumped") \ 190 \ 191 product_pd(bool, UseLargePages, \ 192 "Use large page memory") \ 193 \ 194 product_pd(bool, UseLargePagesIndividualAllocation, \ 195 "Allocate large pages individually for better affinity") \ 196 \ 197 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 198 "Fail large pages individual allocation") \ 199 \ 200 product(bool, UseNUMA, false, \ 201 "Use NUMA if available") \ 202 \ 203 product(bool, UseNUMAInterleaving, false, \ 204 "Interleave memory across NUMA nodes if available") \ 205 \ 206 product(size_t, NUMAInterleaveGranularity, 2*M, \ 207 "Granularity to use for NUMA interleaving on Windows OS") \ 208 constraint(NUMAInterleaveGranularityConstraintFunc, AtParse) \ 209 \ 210 product(uintx, NUMAChunkResizeWeight, 20, \ 211 "Percentage (0-100) used to weight the current sample when " \ 212 "computing exponentially decaying average for " \ 213 "AdaptiveNUMAChunkSizing") \ 214 range(0, 100) \ 215 \ 216 product(size_t, NUMASpaceResizeRate, 1*G, \ 217 "Do not reallocate more than this amount per collection") \ 218 range(0, max_uintx) \ 219 \ 220 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 221 "Enable adaptive chunk sizing for NUMA") \ 222 \ 223 product(bool, NUMAStats, false, \ 224 "Print NUMA stats in detailed heap information") \ 225 \ 226 product(uintx, NUMAPageScanRate, 256, \ 227 "Maximum number of pages to include in the page scan procedure") \ 228 range(0, max_uintx) \ 229 \ 230 product(bool, UseAES, false, \ 231 "Control whether AES instructions are used when available") \ 232 \ 233 product(bool, UseFMA, false, \ 234 "Control whether FMA instructions are used when available") \ 235 \ 236 product(bool, UseSHA, false, \ 237 "Control whether SHA instructions are used when available") \ 238 \ 239 product(bool, UseGHASHIntrinsics, false, DIAGNOSTIC, \ 240 "Use intrinsics for GHASH versions of crypto") \ 241 \ 242 product(bool, UseBASE64Intrinsics, false, \ 243 "Use intrinsics for java.util.Base64") \ 244 \ 245 product(size_t, LargePageSizeInBytes, 0, \ 246 "Maximum large page size used (0 will use the default large " \ 247 "page size for the environment as the maximum)") \ 248 range(0, max_uintx) \ 249 \ 250 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 251 "Use large pages if maximum heap is at least this big") \ 252 range(0, max_uintx) \ 253 \ 254 product(bool, ForceTimeHighResolution, false, \ 255 "Using high time resolution (for Win32 only)") \ 256 \ 257 develop(bool, TracePcPatching, false, \ 258 "Trace usage of frame::patch_pc") \ 259 \ 260 develop(bool, TraceRelocator, false, \ 261 "Trace the bytecode relocator") \ 262 \ 263 \ 264 product(bool, SafepointALot, false, DIAGNOSTIC, \ 265 "Generate a lot of safepoints. This works with " \ 266 "GuaranteedSafepointInterval") \ 267 \ 268 product(bool, HandshakeALot, false, DIAGNOSTIC, \ 269 "Generate a lot of handshakes. This works with " \ 270 "GuaranteedSafepointInterval") \ 271 \ 272 product_pd(bool, BackgroundCompilation, \ 273 "A thread requesting compilation is not blocked during " \ 274 "compilation") \ 275 \ 276 product(bool, MethodFlushing, true, \ 277 "Reclamation of zombie and not-entrant methods") \ 278 \ 279 develop(bool, VerifyStack, false, \ 280 "Verify stack of each thread when it is entering a runtime call") \ 281 \ 282 product(bool, ForceUnreachable, false, DIAGNOSTIC, \ 283 "Make all non code cache addresses to be unreachable by " \ 284 "forcing use of 64bit literal fixups") \ 285 \ 286 develop(bool, TraceDerivedPointers, false, \ 287 "Trace traversal of derived pointers on stack") \ 288 \ 289 notproduct(bool, TraceCodeBlobStacks, false, \ 290 "Trace stack-walk of codeblobs") \ 291 \ 292 notproduct(bool, PrintRewrites, false, \ 293 "Print methods that are being rewritten") \ 294 \ 295 product(bool, UseInlineCaches, true, \ 296 "Use Inline Caches for virtual calls ") \ 297 \ 298 product(bool, InlineArrayCopy, true, DIAGNOSTIC, \ 299 "Inline arraycopy native that is known to be part of " \ 300 "base library DLL") \ 301 \ 302 product(bool, InlineObjectHash, true, DIAGNOSTIC, \ 303 "Inline Object::hashCode() native that is known to be part " \ 304 "of base library DLL") \ 305 \ 306 product(bool, InlineNatives, true, DIAGNOSTIC, \ 307 "Inline natives that are known to be part of base library DLL") \ 308 \ 309 product(bool, InlineMathNatives, true, DIAGNOSTIC, \ 310 "Inline SinD, CosD, etc.") \ 311 \ 312 product(bool, InlineClassNatives, true, DIAGNOSTIC, \ 313 "Inline Class.isInstance, etc") \ 314 \ 315 product(bool, InlineThreadNatives, true, DIAGNOSTIC, \ 316 "Inline Thread.currentThread, etc") \ 317 \ 318 product(bool, InlineUnsafeOps, true, DIAGNOSTIC, \ 319 "Inline memory ops (native methods) from Unsafe") \ 320 \ 321 product(bool, CriticalJNINatives, false, \ 322 "(Deprecated) Check for critical JNI entry points") \ 323 \ 324 product(bool, UseAESIntrinsics, false, DIAGNOSTIC, \ 325 "Use intrinsics for AES versions of crypto") \ 326 \ 327 product(bool, UseAESCTRIntrinsics, false, DIAGNOSTIC, \ 328 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 329 \ 330 product(bool, UseMD5Intrinsics, false, DIAGNOSTIC, \ 331 "Use intrinsics for MD5 crypto hash function") \ 332 \ 333 product(bool, UseSHA1Intrinsics, false, DIAGNOSTIC, \ 334 "Use intrinsics for SHA-1 crypto hash function. " \ 335 "Requires that UseSHA is enabled.") \ 336 \ 337 product(bool, UseSHA256Intrinsics, false, DIAGNOSTIC, \ 338 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 339 "Requires that UseSHA is enabled.") \ 340 \ 341 product(bool, UseSHA512Intrinsics, false, DIAGNOSTIC, \ 342 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 343 "Requires that UseSHA is enabled.") \ 344 \ 345 product(bool, UseSHA3Intrinsics, false, DIAGNOSTIC, \ 346 "Use intrinsics for SHA3 crypto hash function. " \ 347 "Requires that UseSHA is enabled.") \ 348 \ 349 product(bool, UseCRC32Intrinsics, false, DIAGNOSTIC, \ 350 "use intrinsics for java.util.zip.CRC32") \ 351 \ 352 product(bool, UseCRC32CIntrinsics, false, DIAGNOSTIC, \ 353 "use intrinsics for java.util.zip.CRC32C") \ 354 \ 355 product(bool, UseAdler32Intrinsics, false, DIAGNOSTIC, \ 356 "use intrinsics for java.util.zip.Adler32") \ 357 \ 358 product(bool, UseVectorizedMismatchIntrinsic, false, DIAGNOSTIC, \ 359 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 360 \ 361 product(bool, UseCopySignIntrinsic, false, DIAGNOSTIC, \ 362 "Enables intrinsification of Math.copySign") \ 363 \ 364 product(bool, UseSignumIntrinsic, false, DIAGNOSTIC, \ 365 "Enables intrinsification of Math.signum") \ 366 \ 367 product(ccstrlist, DisableIntrinsic, "", DIAGNOSTIC, \ 368 "do not expand intrinsics whose (internal) names appear here") \ 369 constraint(DisableIntrinsicConstraintFunc,AfterErgo) \ 370 \ 371 product(ccstrlist, ControlIntrinsic, "", DIAGNOSTIC, \ 372 "Control intrinsics using a list of +/- (internal) names, " \ 373 "separated by commas") \ 374 constraint(ControlIntrinsicConstraintFunc,AfterErgo) \ 375 \ 376 develop(bool, TraceCallFixup, false, \ 377 "Trace all call fixups") \ 378 \ 379 develop(bool, DeoptimizeALot, false, \ 380 "Deoptimize at every exit from the runtime system") \ 381 \ 382 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 383 "A comma separated list of bcis to deoptimize at") \ 384 \ 385 develop(bool, DeoptimizeRandom, false, \ 386 "Deoptimize random frames on random exit from the runtime system")\ 387 \ 388 notproduct(bool, ZombieALot, false, \ 389 "Create zombies (non-entrant) at exit from the runtime system") \ 390 \ 391 notproduct(bool, WalkStackALot, false, \ 392 "Trace stack (no print) at every exit from the runtime system") \ 393 \ 394 develop(bool, DeoptimizeObjectsALot, false, \ 395 "For testing purposes concurrent threads revert optimizations " \ 396 "based on escape analysis at intervals given with " \ 397 "DeoptimizeObjectsALotInterval=n. The thread count is given " \ 398 "with DeoptimizeObjectsALotThreadCountSingle and " \ 399 "DeoptimizeObjectsALotThreadCountAll.") \ 400 \ 401 develop(uint64_t, DeoptimizeObjectsALotInterval, 5, \ 402 "Interval for DeoptimizeObjectsALot.") \ 403 range(0, max_jlong) \ 404 \ 405 develop(int, DeoptimizeObjectsALotThreadCountSingle, 1, \ 406 "The number of threads that revert optimizations based on " \ 407 "escape analysis for a single thread if DeoptimizeObjectsALot " \ 408 "is enabled. The target thread is selected round robin." ) \ 409 range(0, max_jint) \ 410 \ 411 develop(int, DeoptimizeObjectsALotThreadCountAll, 1, \ 412 "The number of threads that revert optimizations based on " \ 413 "escape analysis for all threads if DeoptimizeObjectsALot " \ 414 "is enabled." ) \ 415 range(0, max_jint) \ 416 \ 417 notproduct(bool, VerifyLastFrame, false, \ 418 "Verify oops on last frame on entry to VM") \ 419 \ 420 product(bool, SafepointTimeout, false, \ 421 "Time out and warn or fail after SafepointTimeoutDelay " \ 422 "milliseconds if failed to reach safepoint") \ 423 \ 424 product(bool, AbortVMOnSafepointTimeout, false, DIAGNOSTIC, \ 425 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 426 \ 427 product(bool, AbortVMOnVMOperationTimeout, false, DIAGNOSTIC, \ 428 "Abort upon failure to complete VM operation promptly") \ 429 \ 430 product(intx, AbortVMOnVMOperationTimeoutDelay, 1000, DIAGNOSTIC, \ 431 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 432 range(0, max_intx) \ 433 \ 434 product(bool, MaxFDLimit, true, \ 435 "Bump the number of file descriptors to maximum (Unix only)") \ 436 \ 437 product(bool, LogEvents, true, DIAGNOSTIC, \ 438 "Enable the various ring buffer event logs") \ 439 \ 440 product(uintx, LogEventsBufferEntries, 20, DIAGNOSTIC, \ 441 "Number of ring buffer event logs") \ 442 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 443 \ 444 product(bool, BytecodeVerificationRemote, true, DIAGNOSTIC, \ 445 "Enable the Java bytecode verifier for remote classes") \ 446 \ 447 product(bool, BytecodeVerificationLocal, false, DIAGNOSTIC, \ 448 "Enable the Java bytecode verifier for local classes") \ 449 \ 450 develop(bool, VerifyStackAtCalls, false, \ 451 "Verify that the stack pointer is unchanged after calls") \ 452 \ 453 develop(bool, TraceJavaAssertions, false, \ 454 "Trace java language assertions") \ 455 \ 456 notproduct(bool, VerifyCodeCache, false, \ 457 "Verify code cache on memory allocation/deallocation") \ 458 \ 459 develop(bool, UseMallocOnly, false, \ 460 "Use only malloc/free for allocation (no resource area/arena)") \ 461 \ 462 develop(bool, ZapResourceArea, trueInDebug, \ 463 "Zap freed resource/arena space") \ 464 \ 465 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 466 "Zap freed VM handle space") \ 467 \ 468 notproduct(bool, ZapStackSegments, trueInDebug, \ 469 "Zap allocated/freed stack segments") \ 470 \ 471 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 472 "Zap unused heap space") \ 473 \ 474 develop(bool, CheckZapUnusedHeapArea, false, \ 475 "Check zapping of unused heap space") \ 476 \ 477 develop(bool, ZapFillerObjects, trueInDebug, \ 478 "Zap filler objects") \ 479 \ 480 product(bool, ExecutingUnitTests, false, \ 481 "Whether the JVM is running unit tests or not") \ 482 \ 483 develop(uintx, ErrorHandlerTest, 0, \ 484 "If > 0, provokes an error after VM initialization; the value " \ 485 "determines which error to provoke. See controlled_crash() " \ 486 "in vmError.cpp.") \ 487 range(0, 17) \ 488 \ 489 develop(uintx, TestCrashInErrorHandler, 0, \ 490 "If > 0, provokes an error inside VM error handler (a secondary " \ 491 "crash). see controlled_crash() in vmError.cpp") \ 492 range(0, 17) \ 493 \ 494 develop(bool, TestSafeFetchInErrorHandler, false , \ 495 "If true, tests SafeFetch inside error handler.") \ 496 \ 497 develop(bool, TestUnresponsiveErrorHandler, false, \ 498 "If true, simulates an unresponsive error handler.") \ 499 \ 500 develop(bool, Verbose, false, \ 501 "Print additional debugging information from other modes") \ 502 \ 503 develop(bool, PrintMiscellaneous, false, \ 504 "Print uncategorized debugging information (requires +Verbose)") \ 505 \ 506 develop(bool, WizardMode, false, \ 507 "Print much more debugging information") \ 508 \ 509 product(bool, ShowMessageBoxOnError, false, \ 510 "Keep process alive on VM fatal error") \ 511 \ 512 product(bool, CreateCoredumpOnCrash, true, \ 513 "Create core/mini dump on VM fatal error") \ 514 \ 515 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 516 "Timeout, in seconds, to limit the time spent on writing an " \ 517 "error log in case of a crash.") \ 518 range(0, (uint64_t)max_jlong/1000) \ 519 \ 520 product(bool, SuppressFatalErrorMessage, false, \ 521 "Report NO fatal error message (avoid deadlock)") \ 522 \ 523 product(ccstrlist, OnError, "", \ 524 "Run user-defined commands on fatal error; see VMError.cpp " \ 525 "for examples") \ 526 \ 527 product(ccstrlist, OnOutOfMemoryError, "", \ 528 "Run user-defined commands on first java.lang.OutOfMemoryError " \ 529 "thrown from JVM") \ 530 \ 531 product(bool, HeapDumpBeforeFullGC, false, MANAGEABLE, \ 532 "Dump heap to file before any major stop-the-world GC") \ 533 \ 534 product(bool, HeapDumpAfterFullGC, false, MANAGEABLE, \ 535 "Dump heap to file after any major stop-the-world GC") \ 536 \ 537 product(bool, HeapDumpOnOutOfMemoryError, false, MANAGEABLE, \ 538 "Dump heap to file when java.lang.OutOfMemoryError is thrown " \ 539 "from JVM") \ 540 \ 541 product(ccstr, HeapDumpPath, NULL, MANAGEABLE, \ 542 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 543 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 544 "in the working directory)") \ 545 \ 546 product(intx, HeapDumpGzipLevel, 0, MANAGEABLE, \ 547 "When HeapDumpOnOutOfMemoryError is on, the gzip compression " \ 548 "level of the dump file. 0 (the default) disables gzip " \ 549 "compression. Otherwise the level must be between 1 and 9.") \ 550 range(0, 9) \ 551 \ 552 product(ccstr, NativeMemoryTracking, DEBUG_ONLY("summary") NOT_DEBUG("off"), \ 553 "Native memory tracking options") \ 554 \ 555 product(bool, PrintNMTStatistics, false, DIAGNOSTIC, \ 556 "Print native memory tracking summary data if it is on") \ 557 \ 558 product(bool, LogCompilation, false, DIAGNOSTIC, \ 559 "Log compilation activity in detail to LogFile") \ 560 \ 561 product(bool, PrintCompilation, false, \ 562 "Print compilations") \ 563 \ 564 product(intx, RepeatCompilation, 0, DIAGNOSTIC, \ 565 "Repeat compilation without installing code (number of times)") \ 566 range(0, max_jint) \ 567 \ 568 product(bool, PrintExtendedThreadInfo, false, \ 569 "Print more information in thread dump") \ 570 \ 571 product(intx, ScavengeRootsInCode, 2, DIAGNOSTIC, \ 572 "0: do not allow scavengable oops in the code cache; " \ 573 "1: allow scavenging from the code cache; " \ 574 "2: emit as many constants as the compiler can see") \ 575 range(0, 2) \ 576 \ 577 product(bool, AlwaysRestoreFPU, false, \ 578 "Restore the FPU control word after every JNI call (expensive)") \ 579 \ 580 product(bool, PrintCompilation2, false, DIAGNOSTIC, \ 581 "Print additional statistics per compilation") \ 582 \ 583 product(bool, PrintAdapterHandlers, false, DIAGNOSTIC, \ 584 "Print code generated for i2c/c2i adapters") \ 585 \ 586 product(bool, VerifyAdapterCalls, trueInDebug, DIAGNOSTIC, \ 587 "Verify that i2c/c2i adapters are called properly") \ 588 \ 589 develop(bool, VerifyAdapterSharing, false, \ 590 "Verify that the code for shared adapters is the equivalent") \ 591 \ 592 product(bool, PrintAssembly, false, DIAGNOSTIC, \ 593 "Print assembly code (using external disassembler.so)") \ 594 \ 595 product(ccstr, PrintAssemblyOptions, NULL, DIAGNOSTIC, \ 596 "Print options string passed to disassembler.so") \ 597 \ 598 notproduct(bool, PrintNMethodStatistics, false, \ 599 "Print a summary statistic for the generated nmethods") \ 600 \ 601 product(bool, PrintNMethods, false, DIAGNOSTIC, \ 602 "Print assembly code for nmethods when generated") \ 603 \ 604 product(bool, PrintNativeNMethods, false, DIAGNOSTIC, \ 605 "Print assembly code for native nmethods when generated") \ 606 \ 607 develop(bool, PrintDebugInfo, false, \ 608 "Print debug information for all nmethods when generated") \ 609 \ 610 develop(bool, PrintRelocations, false, \ 611 "Print relocation information for all nmethods when generated") \ 612 \ 613 develop(bool, PrintDependencies, false, \ 614 "Print dependency information for all nmethods when generated") \ 615 \ 616 develop(bool, PrintExceptionHandlers, false, \ 617 "Print exception handler tables for all nmethods when generated") \ 618 \ 619 develop(bool, StressCompiledExceptionHandlers, false, \ 620 "Exercise compiled exception handlers") \ 621 \ 622 develop(bool, InterceptOSException, false, \ 623 "Start debugger when an implicit OS (e.g. NULL) " \ 624 "exception happens") \ 625 \ 626 product(bool, PrintCodeCache, false, \ 627 "Print the code cache memory usage when exiting") \ 628 \ 629 develop(bool, PrintCodeCache2, false, \ 630 "Print detailed usage information on the code cache when exiting")\ 631 \ 632 product(bool, PrintCodeCacheOnCompilation, false, \ 633 "Print the code cache memory usage each time a method is " \ 634 "compiled") \ 635 \ 636 product(bool, PrintCodeHeapAnalytics, false, DIAGNOSTIC, \ 637 "Print code heap usage statistics on exit and on full condition") \ 638 \ 639 product(bool, PrintStubCode, false, DIAGNOSTIC, \ 640 "Print generated stub code") \ 641 \ 642 product(bool, StackTraceInThrowable, true, \ 643 "Collect backtrace in throwable when exception happens") \ 644 \ 645 product(bool, OmitStackTraceInFastThrow, true, \ 646 "Omit backtraces for some 'hot' exceptions in optimized code") \ 647 \ 648 product(bool, ShowCodeDetailsInExceptionMessages, true, MANAGEABLE, \ 649 "Show exception messages from RuntimeExceptions that contain " \ 650 "snippets of the failing code. Disable this to improve privacy.") \ 651 \ 652 product(bool, PrintWarnings, true, \ 653 "Print JVM warnings to output stream") \ 654 \ 655 product(bool, RegisterFinalizersAtInit, true, \ 656 "Register finalizable objects at end of Object.<init> or " \ 657 "after allocation") \ 658 \ 659 develop(bool, RegisterReferences, true, \ 660 "Tell whether the VM should register soft/weak/final/phantom " \ 661 "references") \ 662 \ 663 develop(bool, PrintCodeCacheExtension, false, \ 664 "Print extension of code cache") \ 665 \ 666 develop(bool, UsePrivilegedStack, true, \ 667 "Enable the security JVM functions") \ 668 \ 669 product(bool, ClassUnloading, true, \ 670 "Do unloading of classes") \ 671 \ 672 product(bool, ClassUnloadingWithConcurrentMark, true, \ 673 "Do unloading of classes with a concurrent marking cycle") \ 674 \ 675 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 676 "Print the system dictionary at exit") \ 677 \ 678 notproduct(bool, PrintClassLoaderDataGraphAtExit, false, \ 679 "Print the class loader data graph at exit") \ 680 \ 681 product(bool, DynamicallyResizeSystemDictionaries, true, DIAGNOSTIC, \ 682 "Dynamically resize system dictionaries as needed") \ 683 \ 684 product(bool, AlwaysLockClassLoader, false, \ 685 "(Deprecated) Require the VM to acquire the class loader lock " \ 686 "before calling loadClass() even for class loaders registering " \ 687 "as parallel capable") \ 688 \ 689 product(bool, AllowParallelDefineClass, false, \ 690 "Allow parallel defineClass requests for class loaders " \ 691 "registering as parallel capable") \ 692 \ 693 product_pd(bool, DontYieldALot, \ 694 "Throw away obvious excess yield calls") \ 695 \ 696 product(bool, DisablePrimordialThreadGuardPages, false, EXPERIMENTAL, \ 697 "Disable the use of stack guard pages if the JVM is loaded " \ 698 "on the primordial process thread") \ 699 \ 700 /* notice: the max range value here is max_jint, not max_intx */ \ 701 /* because of overflow issue */ \ 702 product(intx, AsyncDeflationInterval, 250, DIAGNOSTIC, \ 703 "Async deflate idle monitors every so many milliseconds when " \ 704 "MonitorUsedDeflationThreshold is exceeded (0 is off).") \ 705 range(0, max_jint) \ 706 \ 707 product(size_t, AvgMonitorsPerThreadEstimate, 1024, DIAGNOSTIC, \ 708 "Used to estimate a variable ceiling based on number of threads " \ 709 "for use with MonitorUsedDeflationThreshold (0 is off).") \ 710 range(0, max_uintx) \ 711 \ 712 /* notice: the max range value here is max_jint, not max_intx */ \ 713 /* because of overflow issue */ \ 714 product(intx, MonitorDeflationMax, 1000000, DIAGNOSTIC, \ 715 "The maximum number of monitors to deflate, unlink and delete " \ 716 "at one time (minimum is 1024).") \ 717 range(1024, max_jint) \ 718 \ 719 product(intx, MonitorUsedDeflationThreshold, 90, DIAGNOSTIC, \ 720 "Percentage of used monitors before triggering deflation (0 is " \ 721 "off). The check is performed on GuaranteedSafepointInterval " \ 722 "or AsyncDeflationInterval.") \ 723 range(0, 100) \ 724 \ 725 product(uintx, NoAsyncDeflationProgressMax, 3, DIAGNOSTIC, \ 726 "Max number of no progress async deflation attempts to tolerate " \ 727 "before adjusting the in_use_list_ceiling up (0 is off).") \ 728 range(0, max_uintx) \ 729 \ 730 product(intx, hashCode, 5, EXPERIMENTAL, \ 731 "(Unstable) select hashCode generation algorithm") \ 732 \ 733 product(bool, FilterSpuriousWakeups, true, \ 734 "When true prevents OS-level spurious, or premature, wakeups " \ 735 "from Object.wait (Ignored for Windows)") \ 736 \ 737 product(bool, ReduceSignalUsage, false, \ 738 "Reduce the use of OS signals in Java and/or the VM") \ 739 \ 740 develop(bool, LoadLineNumberTables, true, \ 741 "Tell whether the class file parser loads line number tables") \ 742 \ 743 develop(bool, LoadLocalVariableTables, true, \ 744 "Tell whether the class file parser loads local variable tables") \ 745 \ 746 develop(bool, LoadLocalVariableTypeTables, true, \ 747 "Tell whether the class file parser loads local variable type" \ 748 "tables") \ 749 \ 750 product(bool, AllowUserSignalHandlers, false, \ 751 "Application will install primary signal handlers for the JVM " \ 752 "(Unix only)") \ 753 \ 754 product(bool, UseSignalChaining, true, \ 755 "Use signal-chaining to invoke signal handlers installed " \ 756 "by the application (Unix only)") \ 757 \ 758 product(bool, RestoreMXCSROnJNICalls, false, \ 759 "Restore MXCSR when returning from JNI calls") \ 760 \ 761 product(bool, CheckJNICalls, false, \ 762 "Verify all arguments to JNI calls") \ 763 \ 764 product(bool, UseFastJNIAccessors, true, \ 765 "Use optimized versions of Get<Primitive>Field") \ 766 \ 767 product(intx, MaxJNILocalCapacity, 65536, \ 768 "Maximum allowable local JNI handle capacity to " \ 769 "EnsureLocalCapacity() and PushLocalFrame(), " \ 770 "where <= 0 is unlimited, default: 65536") \ 771 range(min_intx, max_intx) \ 772 \ 773 product(bool, EagerXrunInit, false, \ 774 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 775 "but not all -Xrun libraries may support the state of the VM " \ 776 "at this time") \ 777 \ 778 product(bool, PreserveAllAnnotations, false, \ 779 "Preserve RuntimeInvisibleAnnotations as well " \ 780 "as RuntimeVisibleAnnotations") \ 781 \ 782 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 783 "Number of OutOfMemoryErrors preallocated with backtrace") \ 784 \ 785 product(bool, UseXMMForArrayCopy, false, \ 786 "Use SSE2 MOVQ instruction for Arraycopy") \ 787 \ 788 notproduct(bool, PrintFieldLayout, false, \ 789 "Print field layout for each class") \ 790 \ 791 /* Need to limit the extent of the padding to reasonable size. */\ 792 /* 8K is well beyond the reasonable HW cache line size, even with */\ 793 /* aggressive prefetching, while still leaving the room for segregating */\ 794 /* among the distinct pages. */\ 795 product(intx, ContendedPaddingWidth, 128, \ 796 "How many bytes to pad the fields/classes marked @Contended with")\ 797 range(0, 8192) \ 798 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 799 \ 800 product(bool, EnableContended, true, \ 801 "Enable @Contended annotation support") \ 802 \ 803 product(bool, RestrictContended, true, \ 804 "Restrict @Contended to trusted classes") \ 805 \ 806 product(bool, UseBiasedLocking, false, \ 807 "(Deprecated) Enable biased locking in JVM") \ 808 \ 809 product(intx, BiasedLockingStartupDelay, 0, \ 810 "(Deprecated) Number of milliseconds to wait before enabling " \ 811 "biased locking") \ 812 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 813 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 814 \ 815 product(bool, PrintBiasedLockingStatistics, false, DIAGNOSTIC, \ 816 "(Deprecated) Print statistics of biased locking in JVM") \ 817 \ 818 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 819 "(Deprecated) Threshold of number of revocations per type to " \ 820 "try to rebias all objects in the heap of that type") \ 821 range(0, max_intx) \ 822 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 823 \ 824 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 825 "(Deprecated) Threshold of number of revocations per type to " \ 826 "permanently revoke biases of all objects in the heap of that " \ 827 "type") \ 828 range(0, max_intx) \ 829 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 830 \ 831 product(intx, BiasedLockingDecayTime, 25000, \ 832 "(Deprecated) Decay time (in milliseconds) to re-enable bulk " \ 833 "rebiasing of a type after previous bulk rebias") \ 834 range(500, max_intx) \ 835 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 836 \ 837 product(intx, DiagnoseSyncOnValueBasedClasses, 0, DIAGNOSTIC, \ 838 "Detect and take action upon identifying synchronization on " \ 839 "value based classes. Modes: " \ 840 "0: off; " \ 841 "1: exit with fatal error; " \ 842 "2: log message to stdout. Output file can be specified with " \ 843 " -Xlog:valuebasedclasses. If JFR is running it will " \ 844 " also generate JFR events.") \ 845 range(0, 2) \ 846 \ 847 product(bool, ExitOnOutOfMemoryError, false, \ 848 "JVM exits on the first occurrence of an out-of-memory error " \ 849 "thrown from JVM") \ 850 \ 851 product(bool, CrashOnOutOfMemoryError, false, \ 852 "JVM aborts, producing an error log and core/mini dump, on the " \ 853 "first occurrence of an out-of-memory error thrown from JVM") \ 854 \ 855 /* tracing */ \ 856 \ 857 develop(bool, StressRewriter, false, \ 858 "Stress linktime bytecode rewriting") \ 859 \ 860 product(ccstr, TraceJVMTI, NULL, \ 861 "Trace flags for JVMTI functions and events") \ 862 \ 863 product(bool, StressLdcRewrite, false, DIAGNOSTIC, \ 864 "Force ldc -> ldc_w rewrite during RedefineClasses. " \ 865 "This option can change an EMCP method into an obsolete method " \ 866 "and can affect tests that expect specific methods to be EMCP. " \ 867 "This option should be used with caution.") \ 868 \ 869 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 870 "(Deprecated) Allow redefinition to add and delete private " \ 871 "static or final methods for compatibility with old releases") \ 872 \ 873 develop(bool, TraceBytecodes, false, \ 874 "Trace bytecode execution") \ 875 \ 876 develop(bool, TraceICs, false, \ 877 "Trace inline cache changes") \ 878 \ 879 notproduct(bool, TraceInvocationCounterOverflow, false, \ 880 "Trace method invocation counter overflow") \ 881 \ 882 develop(bool, TraceInlineCacheClearing, false, \ 883 "Trace clearing of inline caches in nmethods") \ 884 \ 885 develop(bool, TraceDependencies, false, \ 886 "Trace dependencies") \ 887 \ 888 develop(bool, VerifyDependencies, trueInDebug, \ 889 "Exercise and verify the compilation dependency mechanism") \ 890 \ 891 develop(bool, TraceNewOopMapGeneration, false, \ 892 "Trace OopMapGeneration") \ 893 \ 894 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 895 "Trace OopMapGeneration: print detailed cell states") \ 896 \ 897 develop(bool, TimeOopMap, false, \ 898 "Time calls to GenerateOopMap::compute_map() in sum") \ 899 \ 900 develop(bool, TimeOopMap2, false, \ 901 "Time calls to GenerateOopMap::compute_map() individually") \ 902 \ 903 develop(bool, TraceOopMapRewrites, false, \ 904 "Trace rewriting of methods during oop map generation") \ 905 \ 906 develop(bool, TraceICBuffer, false, \ 907 "Trace usage of IC buffer") \ 908 \ 909 develop(bool, TraceCompiledIC, false, \ 910 "Trace changes of compiled IC") \ 911 \ 912 develop(bool, FLSVerifyDictionary, false, \ 913 "Do lots of (expensive) FLS dictionary verification") \ 914 \ 915 \ 916 notproduct(bool, CheckMemoryInitialization, false, \ 917 "Check memory initialization") \ 918 \ 919 product(uintx, ProcessDistributionStride, 4, \ 920 "Stride through processors when distributing processes") \ 921 range(0, max_juint) \ 922 \ 923 develop(bool, TraceFinalizerRegistration, false, \ 924 "Trace registration of final references") \ 925 \ 926 product(bool, IgnoreEmptyClassPaths, false, \ 927 "Ignore empty path elements in -classpath") \ 928 \ 929 product(bool, PrintHeapAtSIGBREAK, true, \ 930 "Print heap layout in response to SIGBREAK") \ 931 \ 932 product(bool, PrintClassHistogram, false, MANAGEABLE, \ 933 "Print a histogram of class instances") \ 934 \ 935 product(double, ObjectCountCutOffPercent, 0.5, EXPERIMENTAL, \ 936 "The percentage of the used heap that the instances of a class " \ 937 "must occupy for the class to generate a trace event") \ 938 range(0.0, 100.0) \ 939 \ 940 /* JVMTI heap profiling */ \ 941 \ 942 product(bool, VerifyBeforeIteration, false, DIAGNOSTIC, \ 943 "Verify memory system before JVMTI iteration") \ 944 \ 945 /* compiler */ \ 946 \ 947 /* notice: the max range value here is max_jint, not max_intx */ \ 948 /* because of overflow issue */ \ 949 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 950 "Number of compiler threads to run") \ 951 range(0, max_jint) \ 952 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 953 \ 954 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 955 "Dynamically choose the number of parallel compiler threads") \ 956 \ 957 product(bool, ReduceNumberOfCompilerThreads, true, DIAGNOSTIC, \ 958 "Reduce the number of parallel compiler threads when they " \ 959 "are not used") \ 960 \ 961 product(bool, TraceCompilerThreads, false, DIAGNOSTIC, \ 962 "Trace creation and removal of compiler threads") \ 963 \ 964 develop(bool, InjectCompilerCreationFailure, false, \ 965 "Inject thread creation failures for " \ 966 "UseDynamicNumberOfCompilerThreads") \ 967 \ 968 develop(bool, GenerateSynchronizationCode, true, \ 969 "generate locking/unlocking code for synchronized methods and " \ 970 "monitors") \ 971 \ 972 develop(bool, GenerateRangeChecks, true, \ 973 "Generate range checks for array accesses") \ 974 \ 975 product_pd(bool, ImplicitNullChecks, DIAGNOSTIC, \ 976 "Generate code for implicit null checks") \ 977 \ 978 product_pd(bool, TrapBasedNullChecks, \ 979 "Generate code for null checks that uses a cmp and trap " \ 980 "instruction raising SIGTRAP. This is only used if an access to" \ 981 "null (+offset) will not raise a SIGSEGV, i.e.," \ 982 "ImplicitNullChecks don't work (PPC64).") \ 983 \ 984 product(bool, EnableThreadSMRExtraValidityChecks, true, DIAGNOSTIC, \ 985 "Enable Thread SMR extra validity checks") \ 986 \ 987 product(bool, EnableThreadSMRStatistics, trueInDebug, DIAGNOSTIC, \ 988 "Enable Thread SMR Statistics") \ 989 \ 990 product(bool, UseNotificationThread, true, \ 991 "Use Notification Thread") \ 992 \ 993 product(bool, Inline, true, \ 994 "Enable inlining") \ 995 \ 996 product(bool, ClipInlining, true, \ 997 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 998 \ 999 develop(bool, UseCHA, true, \ 1000 "Enable CHA") \ 1001 \ 1002 product(bool, UseVtableBasedCHA, true, DIAGNOSTIC, \ 1003 "Use vtable information during CHA") \ 1004 \ 1005 product(bool, UseTypeProfile, true, \ 1006 "Check interpreter profile for historically monomorphic calls") \ 1007 \ 1008 product(bool, PrintInlining, false, DIAGNOSTIC, \ 1009 "Print inlining optimizations") \ 1010 \ 1011 product(bool, UsePopCountInstruction, false, \ 1012 "Use population count instruction") \ 1013 \ 1014 develop(bool, EagerInitialization, false, \ 1015 "Eagerly initialize classes if possible") \ 1016 \ 1017 product(bool, LogTouchedMethods, false, DIAGNOSTIC, \ 1018 "Log methods which have been ever touched in runtime") \ 1019 \ 1020 product(bool, PrintTouchedMethodsAtExit, false, DIAGNOSTIC, \ 1021 "Print all methods that have been ever touched in runtime") \ 1022 \ 1023 develop(bool, TraceMethodReplacement, false, \ 1024 "Print when methods are replaced do to recompilation") \ 1025 \ 1026 develop(bool, PrintMethodFlushing, false, \ 1027 "Print the nmethods being flushed") \ 1028 \ 1029 product(bool, PrintMethodFlushingStatistics, false, DIAGNOSTIC, \ 1030 "print statistics about method flushing") \ 1031 \ 1032 product(intx, HotMethodDetectionLimit, 100000, DIAGNOSTIC, \ 1033 "Number of compiled code invocations after which " \ 1034 "the method is considered as hot by the flusher") \ 1035 range(1, max_jint) \ 1036 \ 1037 product(intx, MinPassesBeforeFlush, 10, DIAGNOSTIC, \ 1038 "Minimum number of sweeper passes before an nmethod " \ 1039 "can be flushed") \ 1040 range(0, max_intx) \ 1041 \ 1042 product(bool, UseCodeAging, true, \ 1043 "Insert counter to detect warm methods") \ 1044 \ 1045 product(bool, StressCodeAging, false, DIAGNOSTIC, \ 1046 "Start with counters compiled in") \ 1047 \ 1048 develop(bool, StressCodeBuffers, false, \ 1049 "Exercise code buffer expansion and other rare state changes") \ 1050 \ 1051 product(bool, DebugNonSafepoints, trueInDebug, DIAGNOSTIC, \ 1052 "Generate extra debugging information for non-safepoints in " \ 1053 "nmethods") \ 1054 \ 1055 product(bool, PrintVMOptions, false, \ 1056 "Print flags that appeared on the command line") \ 1057 \ 1058 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1059 "Ignore unrecognized VM options") \ 1060 \ 1061 product(bool, PrintCommandLineFlags, false, \ 1062 "Print flags specified on command line or set by ergonomics") \ 1063 \ 1064 product(bool, PrintFlagsInitial, false, \ 1065 "Print all VM flags before argument processing and exit VM") \ 1066 \ 1067 product(bool, PrintFlagsFinal, false, \ 1068 "Print all VM flags after argument and ergonomic processing") \ 1069 \ 1070 notproduct(bool, PrintFlagsWithComments, false, \ 1071 "Print all VM flags with default values and descriptions and " \ 1072 "exit") \ 1073 \ 1074 product(bool, PrintFlagsRanges, false, \ 1075 "Print VM flags and their ranges") \ 1076 \ 1077 product(bool, SerializeVMOutput, true, DIAGNOSTIC, \ 1078 "Use a mutex to serialize output to tty and LogFile") \ 1079 \ 1080 product(bool, DisplayVMOutput, true, DIAGNOSTIC, \ 1081 "Display all VM output on the tty, independently of LogVMOutput") \ 1082 \ 1083 product(bool, LogVMOutput, false, DIAGNOSTIC, \ 1084 "Save VM output to LogFile") \ 1085 \ 1086 product(ccstr, LogFile, NULL, DIAGNOSTIC, \ 1087 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1088 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1089 \ 1090 product(ccstr, ErrorFile, NULL, \ 1091 "If an error occurs, save the error data to this file " \ 1092 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1093 \ 1094 product(bool, ExtensiveErrorReports, \ 1095 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1096 "Error reports are more extensive.") \ 1097 \ 1098 product(bool, DisplayVMOutputToStderr, false, \ 1099 "If DisplayVMOutput is true, display all VM output to stderr") \ 1100 \ 1101 product(bool, DisplayVMOutputToStdout, false, \ 1102 "If DisplayVMOutput is true, display all VM output to stdout") \ 1103 \ 1104 product(bool, ErrorFileToStderr, false, \ 1105 "If true, error data is printed to stderr instead of a file") \ 1106 \ 1107 product(bool, ErrorFileToStdout, false, \ 1108 "If true, error data is printed to stdout instead of a file") \ 1109 \ 1110 product(bool, UseHeavyMonitors, false, \ 1111 "use heavyweight instead of lightweight Java monitors") \ 1112 \ 1113 product(bool, PrintStringTableStatistics, false, \ 1114 "print statistics about the StringTable and SymbolTable") \ 1115 \ 1116 product(bool, VerifyStringTableAtExit, false, DIAGNOSTIC, \ 1117 "verify StringTable contents at exit") \ 1118 \ 1119 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1120 "print histogram of the symbol table") \ 1121 \ 1122 product(ccstr, AbortVMOnException, NULL, DIAGNOSTIC, \ 1123 "Call fatal if this exception is thrown. Example: " \ 1124 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1125 \ 1126 product(ccstr, AbortVMOnExceptionMessage, NULL, DIAGNOSTIC, \ 1127 "Call fatal if the exception pointed by AbortVMOnException " \ 1128 "has this message") \ 1129 \ 1130 develop(bool, DebugVtables, false, \ 1131 "add debugging code to vtable dispatch") \ 1132 \ 1133 notproduct(bool, PrintVtableStats, false, \ 1134 "print vtables stats at end of run") \ 1135 \ 1136 develop(bool, TraceCreateZombies, false, \ 1137 "trace creation of zombie nmethods") \ 1138 \ 1139 product(bool, RangeCheckElimination, true, \ 1140 "Eliminate range checks") \ 1141 \ 1142 develop_pd(bool, UncommonNullCast, \ 1143 "track occurrences of null in casts; adjust compiler tactics") \ 1144 \ 1145 develop(bool, TypeProfileCasts, true, \ 1146 "treat casts like calls for purposes of type profiling") \ 1147 \ 1148 develop(bool, TraceLivenessGen, false, \ 1149 "Trace the generation of liveness analysis information") \ 1150 \ 1151 notproduct(bool, TraceLivenessQuery, false, \ 1152 "Trace queries of liveness analysis information") \ 1153 \ 1154 notproduct(bool, CollectIndexSetStatistics, false, \ 1155 "Collect information about IndexSets") \ 1156 \ 1157 develop(intx, FastAllocateSizeLimit, 128*K, \ 1158 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1159 "Inline allocations larger than this in doublewords must go slow")\ 1160 \ 1161 product_pd(bool, CompactStrings, \ 1162 "Enable Strings to use single byte chars in backing store") \ 1163 \ 1164 product_pd(uintx, TypeProfileLevel, \ 1165 "=XYZ, with Z: Type profiling of arguments at call; " \ 1166 "Y: Type profiling of return value at call; " \ 1167 "X: Type profiling of parameters to methods; " \ 1168 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1169 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1170 \ 1171 product(intx, TypeProfileArgsLimit, 2, \ 1172 "max number of call arguments to consider for type profiling") \ 1173 range(0, 16) \ 1174 \ 1175 product(intx, TypeProfileParmsLimit, 2, \ 1176 "max number of incoming parameters to consider for type profiling"\ 1177 ", -1 for all") \ 1178 range(-1, 64) \ 1179 \ 1180 /* statistics */ \ 1181 develop(bool, CountCompiledCalls, false, \ 1182 "Count method invocations") \ 1183 \ 1184 notproduct(bool, ICMissHistogram, false, \ 1185 "Produce histogram of IC misses") \ 1186 \ 1187 /* interpreter */ \ 1188 product_pd(bool, RewriteBytecodes, \ 1189 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1190 \ 1191 product_pd(bool, RewriteFrequentPairs, \ 1192 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1193 \ 1194 product(bool, PrintInterpreter, false, DIAGNOSTIC, \ 1195 "Print the generated interpreter code") \ 1196 \ 1197 product(bool, UseInterpreter, true, \ 1198 "Use interpreter for non-compiled methods") \ 1199 \ 1200 develop(bool, UseFastSignatureHandlers, true, \ 1201 "Use fast signature handlers for native calls") \ 1202 \ 1203 product(bool, UseLoopCounter, true, \ 1204 "Increment invocation counter on backward branch") \ 1205 \ 1206 product_pd(bool, UseOnStackReplacement, \ 1207 "Use on stack replacement, calls runtime if invoc. counter " \ 1208 "overflows in loop") \ 1209 \ 1210 notproduct(bool, TraceOnStackReplacement, false, \ 1211 "Trace on stack replacement") \ 1212 \ 1213 product_pd(bool, PreferInterpreterNativeStubs, \ 1214 "Use always interpreter stubs for native methods invoked via " \ 1215 "interpreter") \ 1216 \ 1217 develop(bool, CountBytecodes, false, \ 1218 "Count number of bytecodes executed") \ 1219 \ 1220 develop(bool, PrintBytecodeHistogram, false, \ 1221 "Print histogram of the executed bytecodes") \ 1222 \ 1223 develop(bool, PrintBytecodePairHistogram, false, \ 1224 "Print histogram of the executed bytecode pairs") \ 1225 \ 1226 product(bool, PrintSignatureHandlers, false, DIAGNOSTIC, \ 1227 "Print code generated for native method signature handlers") \ 1228 \ 1229 develop(bool, VerifyOops, false, \ 1230 "Do plausibility checks for oops") \ 1231 \ 1232 develop(bool, CheckUnhandledOops, false, \ 1233 "Check for unhandled oops in VM code") \ 1234 \ 1235 develop(bool, VerifyJNIFields, trueInDebug, \ 1236 "Verify jfieldIDs for instance fields") \ 1237 \ 1238 notproduct(bool, VerifyJNIEnvThread, false, \ 1239 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1240 "from JNI") \ 1241 \ 1242 develop(bool, VerifyFPU, false, \ 1243 "Verify FPU state (check for NaN's, etc.)") \ 1244 \ 1245 develop(bool, VerifyThread, false, \ 1246 "Watch the thread register for corruption (SPARC only)") \ 1247 \ 1248 develop(bool, VerifyActivationFrameSize, false, \ 1249 "Verify that activation frame didn't become smaller than its " \ 1250 "minimal size") \ 1251 \ 1252 develop(bool, TraceFrequencyInlining, false, \ 1253 "Trace frequency based inlining") \ 1254 \ 1255 develop_pd(bool, InlineIntrinsics, \ 1256 "Inline intrinsics that can be statically resolved") \ 1257 \ 1258 product_pd(bool, ProfileInterpreter, \ 1259 "Profile at the bytecode level during interpretation") \ 1260 \ 1261 develop_pd(bool, ProfileTraps, \ 1262 "Profile deoptimization traps at the bytecode level") \ 1263 \ 1264 product(intx, ProfileMaturityPercentage, 20, \ 1265 "number of method invocations/branches (expressed as % of " \ 1266 "CompileThreshold) before using the method's profile") \ 1267 range(0, 100) \ 1268 \ 1269 product(bool, PrintMethodData, false, DIAGNOSTIC, \ 1270 "Print the results of +ProfileInterpreter at end of run") \ 1271 \ 1272 develop(bool, VerifyDataPointer, trueInDebug, \ 1273 "Verify the method data pointer during interpreter profiling") \ 1274 \ 1275 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1276 "Manually make GC thread crash then dump java stack trace; " \ 1277 "Test only") \ 1278 \ 1279 /* compilation */ \ 1280 product(bool, UseCompiler, true, \ 1281 "Use Just-In-Time compilation") \ 1282 \ 1283 product(bool, UseCounterDecay, true, \ 1284 "Adjust recompilation counters") \ 1285 \ 1286 develop(intx, CounterHalfLifeTime, 30, \ 1287 "Half-life time of invocation counters (in seconds)") \ 1288 \ 1289 develop(intx, CounterDecayMinIntervalLength, 500, \ 1290 "The minimum interval (in milliseconds) between invocation of " \ 1291 "CounterDecay") \ 1292 \ 1293 product(bool, AlwaysCompileLoopMethods, false, \ 1294 "When using recompilation, never interpret methods " \ 1295 "containing loops") \ 1296 \ 1297 product(intx, AllocatePrefetchStyle, 1, \ 1298 "0 = no prefetch, " \ 1299 "1 = generate prefetch instructions for each allocation, " \ 1300 "2 = use TLAB watermark to gate allocation prefetch, " \ 1301 "3 = generate one prefetch instruction per cache line") \ 1302 range(0, 3) \ 1303 \ 1304 product(intx, AllocatePrefetchDistance, -1, \ 1305 "Distance to prefetch ahead of allocation pointer. " \ 1306 "-1: use system-specific value (automatically determined") \ 1307 constraint(AllocatePrefetchDistanceConstraintFunc,AfterMemoryInit)\ 1308 \ 1309 product(intx, AllocatePrefetchLines, 3, \ 1310 "Number of lines to prefetch ahead of array allocation pointer") \ 1311 range(1, 64) \ 1312 \ 1313 product(intx, AllocateInstancePrefetchLines, 1, \ 1314 "Number of lines to prefetch ahead of instance allocation " \ 1315 "pointer") \ 1316 range(1, 64) \ 1317 \ 1318 product(intx, AllocatePrefetchStepSize, 16, \ 1319 "Step size in bytes of sequential prefetch instructions") \ 1320 range(1, 512) \ 1321 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1322 \ 1323 product(intx, AllocatePrefetchInstr, 0, \ 1324 "Select instruction to prefetch ahead of allocation pointer") \ 1325 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1326 \ 1327 /* deoptimization */ \ 1328 develop(bool, TraceDeoptimization, false, \ 1329 "Trace deoptimization") \ 1330 \ 1331 develop(bool, PrintDeoptimizationDetails, false, \ 1332 "Print more information about deoptimization") \ 1333 \ 1334 develop(bool, DebugDeoptimization, false, \ 1335 "Tracing various information while debugging deoptimization") \ 1336 \ 1337 product(intx, SelfDestructTimer, 0, \ 1338 "Will cause VM to terminate after a given time (in minutes) " \ 1339 "(0 means off)") \ 1340 range(0, max_intx) \ 1341 \ 1342 product(intx, MaxJavaStackTraceDepth, 1024, \ 1343 "The maximum number of lines in the stack trace for Java " \ 1344 "exceptions (0 means all)") \ 1345 range(0, max_jint/2) \ 1346 \ 1347 /* notice: the max range value here is max_jint, not max_intx */ \ 1348 /* because of overflow issue */ \ 1349 product(intx, GuaranteedSafepointInterval, 1000, DIAGNOSTIC, \ 1350 "Guarantee a safepoint (at least) every so many milliseconds " \ 1351 "(0 means none)") \ 1352 range(0, max_jint) \ 1353 \ 1354 product(intx, SafepointTimeoutDelay, 10000, \ 1355 "Delay in milliseconds for option SafepointTimeout") \ 1356 range(0, max_intx LP64_ONLY(/MICROUNITS)) \ 1357 \ 1358 product(intx, NmethodSweepActivity, 10, \ 1359 "Removes cold nmethods from code cache if > 0. Higher values " \ 1360 "result in more aggressive sweeping") \ 1361 range(0, 2000) \ 1362 \ 1363 notproduct(bool, LogSweeper, false, \ 1364 "Keep a ring buffer of sweeper activity") \ 1365 \ 1366 notproduct(intx, SweeperLogEntries, 1024, \ 1367 "Number of records in the ring buffer of sweeper activity") \ 1368 \ 1369 develop(intx, MallocCatchPtr, -1, \ 1370 "Hit breakpoint when mallocing/freeing this pointer") \ 1371 \ 1372 notproduct(ccstrlist, SuppressErrorAt, "", \ 1373 "List of assertions (file:line) to muzzle") \ 1374 \ 1375 develop(intx, StackPrintLimit, 100, \ 1376 "number of stack frames to print in VM-level stack dump") \ 1377 \ 1378 notproduct(intx, MaxElementPrintSize, 256, \ 1379 "maximum number of elements to print") \ 1380 \ 1381 notproduct(intx, MaxSubklassPrintSize, 4, \ 1382 "maximum number of subklasses to print when printing klass") \ 1383 \ 1384 develop(intx, MaxForceInlineLevel, 100, \ 1385 "maximum number of nested calls that are forced for inlining " \ 1386 "(using CompileCommand or marked w/ @ForceInline)") \ 1387 range(0, max_jint) \ 1388 \ 1389 product(intx, MinInliningThreshold, 250, \ 1390 "The minimum invocation count a method needs to have to be " \ 1391 "inlined") \ 1392 range(0, max_jint) \ 1393 \ 1394 develop(intx, MethodHistogramCutoff, 100, \ 1395 "The cutoff value for method invocation histogram (+CountCalls)") \ 1396 \ 1397 develop(intx, DontYieldALotInterval, 10, \ 1398 "Interval between which yields will be dropped (milliseconds)") \ 1399 \ 1400 notproduct(intx, DeoptimizeALotInterval, 5, \ 1401 "Number of exits until DeoptimizeALot kicks in") \ 1402 \ 1403 notproduct(intx, ZombieALotInterval, 5, \ 1404 "Number of exits until ZombieALot kicks in") \ 1405 \ 1406 product(uintx, MallocMaxTestWords, 0, DIAGNOSTIC, \ 1407 "If non-zero, maximum number of words that malloc/realloc can " \ 1408 "allocate (for testing only)") \ 1409 range(0, max_uintx) \ 1410 \ 1411 product(intx, TypeProfileWidth, 2, \ 1412 "Number of receiver types to record in call/cast profile") \ 1413 range(0, 8) \ 1414 \ 1415 develop(intx, BciProfileWidth, 2, \ 1416 "Number of return bci's to record in ret profile") \ 1417 \ 1418 product(intx, PerMethodRecompilationCutoff, 400, \ 1419 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1420 range(-1, max_intx) \ 1421 \ 1422 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1423 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1424 range(-1, max_intx) \ 1425 \ 1426 product(intx, PerMethodTrapLimit, 100, \ 1427 "Limit on traps (of one kind) in a method (includes inlines)") \ 1428 range(0, max_jint) \ 1429 \ 1430 product(intx, PerMethodSpecTrapLimit, 5000, EXPERIMENTAL, \ 1431 "Limit on speculative traps (of one kind) in a method " \ 1432 "(includes inlines)") \ 1433 range(0, max_jint) \ 1434 \ 1435 product(intx, PerBytecodeTrapLimit, 4, \ 1436 "Limit on traps (of one kind) at a particular BCI") \ 1437 range(0, max_jint) \ 1438 \ 1439 product(intx, SpecTrapLimitExtraEntries, 3, EXPERIMENTAL, \ 1440 "Extra method data trap entries for speculation") \ 1441 \ 1442 develop(intx, InlineFrequencyRatio, 20, \ 1443 "Ratio of call site execution to caller method invocation") \ 1444 range(0, max_jint) \ 1445 \ 1446 product_pd(intx, InlineFrequencyCount, DIAGNOSTIC, \ 1447 "Count of call site execution necessary to trigger frequent " \ 1448 "inlining") \ 1449 range(0, max_jint) \ 1450 \ 1451 develop(intx, InlineThrowCount, 50, \ 1452 "Force inlining of interpreted methods that throw this often") \ 1453 range(0, max_jint) \ 1454 \ 1455 develop(intx, InlineThrowMaxSize, 200, \ 1456 "Force inlining of throwing methods smaller than this") \ 1457 range(0, max_jint) \ 1458 \ 1459 product(size_t, MetaspaceSize, NOT_LP64(16 * M) LP64_ONLY(21 * M), \ 1460 "Initial threshold (in bytes) at which a garbage collection " \ 1461 "is done to reduce Metaspace usage") \ 1462 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1463 \ 1464 product(size_t, MaxMetaspaceSize, max_uintx, \ 1465 "Maximum size of Metaspaces (in bytes)") \ 1466 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1467 \ 1468 product(size_t, CompressedClassSpaceSize, 1*G, \ 1469 "Maximum size of class area in Metaspace when compressed " \ 1470 "class pointers are used") \ 1471 range(1*M, 3*G) \ 1472 \ 1473 develop(size_t, CompressedClassSpaceBaseAddress, 0, \ 1474 "Force the class space to be allocated at this address or " \ 1475 "fails VM initialization (requires -Xshare=off.") \ 1476 \ 1477 product(ccstr, MetaspaceReclaimPolicy, "balanced", \ 1478 "options: balanced, aggressive, none") \ 1479 \ 1480 product(bool, PrintMetaspaceStatisticsAtExit, false, DIAGNOSTIC, \ 1481 "Print metaspace statistics upon VM exit.") \ 1482 \ 1483 product(bool, MetaspaceGuardAllocations, false, DIAGNOSTIC, \ 1484 "Metapace allocations are guarded.") \ 1485 \ 1486 product(bool, MetaspaceHandleDeallocations, true, DIAGNOSTIC, \ 1487 "Switch off Metapace deallocation handling.") \ 1488 \ 1489 product(uintx, MinHeapFreeRatio, 40, MANAGEABLE, \ 1490 "The minimum percentage of heap free after GC to avoid expansion."\ 1491 " For most GCs this applies to the old generation. In G1 and" \ 1492 " ParallelGC it applies to the whole heap.") \ 1493 range(0, 100) \ 1494 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1495 \ 1496 product(uintx, MaxHeapFreeRatio, 70, MANAGEABLE, \ 1497 "The maximum percentage of heap free after GC to avoid shrinking."\ 1498 " For most GCs this applies to the old generation. In G1 and" \ 1499 " ParallelGC it applies to the whole heap.") \ 1500 range(0, 100) \ 1501 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1502 \ 1503 product(bool, ShrinkHeapInSteps, true, \ 1504 "When disabled, informs the GC to shrink the java heap directly" \ 1505 " to the target size at the next full GC rather than requiring" \ 1506 " smaller steps during multiple full GCs.") \ 1507 \ 1508 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1509 "Number of milliseconds per MB of free space in the heap") \ 1510 range(0, max_intx) \ 1511 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1512 \ 1513 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1514 "The minimum change in heap space due to GC (in bytes)") \ 1515 range(0, max_uintx) \ 1516 \ 1517 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1518 "The minimum expansion of Metaspace (in bytes)") \ 1519 range(0, max_uintx) \ 1520 \ 1521 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1522 "The maximum percentage of Metaspace free after GC to avoid " \ 1523 "shrinking") \ 1524 range(0, 100) \ 1525 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1526 \ 1527 product(uintx, MinMetaspaceFreeRatio, 40, \ 1528 "The minimum percentage of Metaspace free after GC to avoid " \ 1529 "expansion") \ 1530 range(0, 99) \ 1531 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1532 \ 1533 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1534 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1535 range(0, max_uintx) \ 1536 \ 1537 /* stack parameters */ \ 1538 product_pd(intx, StackYellowPages, \ 1539 "Number of yellow zone (recoverable overflows) pages of size " \ 1540 "4KB. If pages are bigger yellow zone is aligned up.") \ 1541 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1542 \ 1543 product_pd(intx, StackRedPages, \ 1544 "Number of red zone (unrecoverable overflows) pages of size " \ 1545 "4KB. If pages are bigger red zone is aligned up.") \ 1546 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1547 \ 1548 product_pd(intx, StackReservedPages, \ 1549 "Number of reserved zone (reserved to annotated methods) pages" \ 1550 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1551 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1552 \ 1553 product(bool, RestrictReservedStack, true, \ 1554 "Restrict @ReservedStackAccess to trusted classes") \ 1555 \ 1556 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1557 product_pd(intx, StackShadowPages, \ 1558 "Number of shadow zone (for overflow checking) pages of size " \ 1559 "4KB. If pages are bigger shadow zone is aligned up. " \ 1560 "This should exceed the depth of the VM and native call stack.") \ 1561 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1562 \ 1563 product_pd(intx, ThreadStackSize, \ 1564 "Thread Stack Size (in Kbytes)") \ 1565 range(0, 1 * M) \ 1566 \ 1567 product_pd(intx, VMThreadStackSize, \ 1568 "Non-Java Thread Stack Size (in Kbytes)") \ 1569 range(0, max_intx/(1 * K)) \ 1570 \ 1571 product_pd(intx, CompilerThreadStackSize, \ 1572 "Compiler Thread Stack Size (in Kbytes)") \ 1573 range(0, max_intx/(1 * K)) \ 1574 \ 1575 develop_pd(size_t, JVMInvokeMethodSlack, \ 1576 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1577 \ 1578 /* code cache parameters */ \ 1579 product_pd(uintx, CodeCacheSegmentSize, EXPERIMENTAL, \ 1580 "Code cache segment size (in bytes) - smallest unit of " \ 1581 "allocation") \ 1582 range(1, 1024) \ 1583 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1584 \ 1585 develop_pd(intx, CodeEntryAlignment, \ 1586 "Code entry alignment for generated code (in bytes)") \ 1587 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1588 \ 1589 product_pd(intx, OptoLoopAlignment, \ 1590 "Align inner loops to zero relative to this modulus") \ 1591 range(1, 16) \ 1592 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1593 \ 1594 product_pd(uintx, InitialCodeCacheSize, \ 1595 "Initial code cache size (in bytes)") \ 1596 constraint(VMPageSizeConstraintFunc, AtParse) \ 1597 \ 1598 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1599 "Minimum code cache size (in bytes) required to start VM.") \ 1600 range(0, max_uintx) \ 1601 \ 1602 product(bool, SegmentedCodeCache, false, \ 1603 "Use a segmented code cache") \ 1604 \ 1605 product_pd(uintx, ReservedCodeCacheSize, \ 1606 "Reserved code cache size (in bytes) - maximum code cache size") \ 1607 constraint(VMPageSizeConstraintFunc, AtParse) \ 1608 \ 1609 product_pd(uintx, NonProfiledCodeHeapSize, \ 1610 "Size of code heap with non-profiled methods (in bytes)") \ 1611 range(0, max_uintx) \ 1612 \ 1613 product_pd(uintx, ProfiledCodeHeapSize, \ 1614 "Size of code heap with profiled methods (in bytes)") \ 1615 range(0, max_uintx) \ 1616 \ 1617 product_pd(uintx, NonNMethodCodeHeapSize, \ 1618 "Size of code heap with non-nmethods (in bytes)") \ 1619 constraint(VMPageSizeConstraintFunc, AtParse) \ 1620 \ 1621 product_pd(uintx, CodeCacheExpansionSize, \ 1622 "Code cache expansion size (in bytes)") \ 1623 range(32*K, max_uintx) \ 1624 \ 1625 product_pd(uintx, CodeCacheMinBlockLength, DIAGNOSTIC, \ 1626 "Minimum number of segments in a code cache block") \ 1627 range(1, 100) \ 1628 \ 1629 notproduct(bool, ExitOnFullCodeCache, false, \ 1630 "Exit the VM if we fill the code cache") \ 1631 \ 1632 product(bool, UseCodeCacheFlushing, true, \ 1633 "Remove cold/old nmethods from the code cache") \ 1634 \ 1635 product(double, SweeperThreshold, 0.5, \ 1636 "Threshold controlling when code cache sweeper is invoked." \ 1637 "Value is percentage of ReservedCodeCacheSize.") \ 1638 range(0.0, 100.0) \ 1639 \ 1640 product(uintx, StartAggressiveSweepingAt, 10, \ 1641 "Start aggressive sweeping if X[%] of the code cache is free." \ 1642 "Segmented code cache: X[%] of the non-profiled heap." \ 1643 "Non-segmented code cache: X[%] of the total code cache") \ 1644 range(0, 100) \ 1645 \ 1646 /* interpreter debugging */ \ 1647 develop(intx, BinarySwitchThreshold, 5, \ 1648 "Minimal number of lookupswitch entries for rewriting to binary " \ 1649 "switch") \ 1650 \ 1651 develop(intx, StopInterpreterAt, 0, \ 1652 "Stop interpreter execution at specified bytecode number") \ 1653 \ 1654 develop(intx, TraceBytecodesAt, 0, \ 1655 "Trace bytecodes starting with specified bytecode number") \ 1656 \ 1657 /* Priorities */ \ 1658 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1659 \ 1660 product(intx, ThreadPriorityPolicy, 0, \ 1661 "0 : Normal. "\ 1662 " VM chooses priorities that are appropriate for normal "\ 1663 " applications. "\ 1664 " On Windows applications are allowed to use higher native "\ 1665 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1666 " not use the highest possible native priority, "\ 1667 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1668 " system threads. On Linux thread priorities are ignored "\ 1669 " because the OS does not support static priority in "\ 1670 " SCHED_OTHER scheduling class which is the only choice for "\ 1671 " non-root, non-realtime applications. "\ 1672 "1 : Aggressive. "\ 1673 " Java thread priorities map over to the entire range of "\ 1674 " native thread priorities. Higher Java thread priorities map "\ 1675 " to higher native thread priorities. This policy should be "\ 1676 " used with care, as sometimes it can cause performance "\ 1677 " degradation in the application and/or the entire system. On "\ 1678 " Linux/BSD/macOS this policy requires root privilege or an "\ 1679 " extended capability.") \ 1680 range(0, 1) \ 1681 \ 1682 product(bool, ThreadPriorityVerbose, false, \ 1683 "Print priority changes") \ 1684 \ 1685 product(intx, CompilerThreadPriority, -1, \ 1686 "The native priority at which compiler threads should run " \ 1687 "(-1 means no change)") \ 1688 range(min_jint, max_jint) \ 1689 \ 1690 product(intx, VMThreadPriority, -1, \ 1691 "The native priority at which the VM thread should run " \ 1692 "(-1 means no change)") \ 1693 range(-1, 127) \ 1694 \ 1695 product(intx, JavaPriority1_To_OSPriority, -1, \ 1696 "Map Java priorities to OS priorities") \ 1697 range(-1, 127) \ 1698 \ 1699 product(intx, JavaPriority2_To_OSPriority, -1, \ 1700 "Map Java priorities to OS priorities") \ 1701 range(-1, 127) \ 1702 \ 1703 product(intx, JavaPriority3_To_OSPriority, -1, \ 1704 "Map Java priorities to OS priorities") \ 1705 range(-1, 127) \ 1706 \ 1707 product(intx, JavaPriority4_To_OSPriority, -1, \ 1708 "Map Java priorities to OS priorities") \ 1709 range(-1, 127) \ 1710 \ 1711 product(intx, JavaPriority5_To_OSPriority, -1, \ 1712 "Map Java priorities to OS priorities") \ 1713 range(-1, 127) \ 1714 \ 1715 product(intx, JavaPriority6_To_OSPriority, -1, \ 1716 "Map Java priorities to OS priorities") \ 1717 range(-1, 127) \ 1718 \ 1719 product(intx, JavaPriority7_To_OSPriority, -1, \ 1720 "Map Java priorities to OS priorities") \ 1721 range(-1, 127) \ 1722 \ 1723 product(intx, JavaPriority8_To_OSPriority, -1, \ 1724 "Map Java priorities to OS priorities") \ 1725 range(-1, 127) \ 1726 \ 1727 product(intx, JavaPriority9_To_OSPriority, -1, \ 1728 "Map Java priorities to OS priorities") \ 1729 range(-1, 127) \ 1730 \ 1731 product(intx, JavaPriority10_To_OSPriority,-1, \ 1732 "Map Java priorities to OS priorities") \ 1733 range(-1, 127) \ 1734 \ 1735 product(bool, UseCriticalJavaThreadPriority, false, EXPERIMENTAL, \ 1736 "Java thread priority 10 maps to critical scheduling priority") \ 1737 \ 1738 product(bool, UseCriticalCompilerThreadPriority, false, EXPERIMENTAL, \ 1739 "Compiler thread(s) run at critical scheduling priority") \ 1740 \ 1741 develop(intx, NewCodeParameter, 0, \ 1742 "Testing Only: Create a dedicated integer parameter before " \ 1743 "putback") \ 1744 \ 1745 /* new oopmap storage allocation */ \ 1746 develop(intx, MinOopMapAllocation, 8, \ 1747 "Minimum number of OopMap entries in an OopMapSet") \ 1748 \ 1749 /* recompilation */ \ 1750 product_pd(intx, CompileThreshold, \ 1751 "number of interpreted method invocations before (re-)compiling") \ 1752 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1753 \ 1754 product_pd(bool, TieredCompilation, \ 1755 "Enable tiered compilation") \ 1756 \ 1757 /* Properties for Java libraries */ \ 1758 \ 1759 product(uint64_t, MaxDirectMemorySize, 0, \ 1760 "Maximum total size of NIO direct-buffer allocations") \ 1761 range(0, max_jlong) \ 1762 \ 1763 /* Flags used for temporary code during development */ \ 1764 \ 1765 product(bool, UseNewCode, false, DIAGNOSTIC, \ 1766 "Testing Only: Use the new version while testing") \ 1767 \ 1768 product(bool, UseNewCode2, false, DIAGNOSTIC, \ 1769 "Testing Only: Use the new version while testing") \ 1770 \ 1771 product(bool, UseNewCode3, false, DIAGNOSTIC, \ 1772 "Testing Only: Use the new version while testing") \ 1773 \ 1774 notproduct(bool, UseDebuggerErgo, false, \ 1775 "Debugging Only: Adjust the VM to be more debugger-friendly. " \ 1776 "Turns on the other UseDebuggerErgo* flags") \ 1777 \ 1778 notproduct(bool, UseDebuggerErgo1, false, \ 1779 "Debugging Only: Enable workarounds for debugger induced " \ 1780 "os::processor_id() >= os::processor_count() problems") \ 1781 \ 1782 notproduct(bool, UseDebuggerErgo2, false, \ 1783 "Debugging Only: Limit the number of spawned JVM threads") \ 1784 \ 1785 notproduct(bool, EnableJVMTIStackDepthAsserts, true, \ 1786 "Enable JVMTI asserts related to stack depth checks") \ 1787 \ 1788 /* flags for performance data collection */ \ 1789 \ 1790 product(bool, UsePerfData, true, \ 1791 "Flag to disable jvmstat instrumentation for performance testing "\ 1792 "and problem isolation purposes") \ 1793 \ 1794 product(bool, PerfDataSaveToFile, false, \ 1795 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 1796 \ 1797 product(ccstr, PerfDataSaveFile, NULL, \ 1798 "Save PerfData memory to the specified absolute pathname. " \ 1799 "The string %p in the file name (if present) " \ 1800 "will be replaced by pid") \ 1801 \ 1802 product(intx, PerfDataSamplingInterval, 50, \ 1803 "Data sampling interval (in milliseconds)") \ 1804 range(PeriodicTask::min_interval, max_jint) \ 1805 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 1806 \ 1807 product(bool, PerfDisableSharedMem, false, \ 1808 "Store performance data in standard memory") \ 1809 \ 1810 product(intx, PerfDataMemorySize, 32*K, \ 1811 "Size of performance data memory region. Will be rounded " \ 1812 "up to a multiple of the native os page size.") \ 1813 range(128, 32*64*K) \ 1814 \ 1815 product(intx, PerfMaxStringConstLength, 1024, \ 1816 "Maximum PerfStringConstant string length before truncation") \ 1817 range(32, 32*K) \ 1818 \ 1819 product(bool, PerfAllowAtExitRegistration, false, \ 1820 "Allow registration of atexit() methods") \ 1821 \ 1822 product(bool, PerfBypassFileSystemCheck, false, \ 1823 "Bypass Win32 file system criteria checks (Windows Only)") \ 1824 \ 1825 product(intx, UnguardOnExecutionViolation, 0, \ 1826 "Unguard page and retry on no-execute fault (Win32 only) " \ 1827 "0=off, 1=conservative, 2=aggressive") \ 1828 range(0, 2) \ 1829 \ 1830 /* Serviceability Support */ \ 1831 \ 1832 product(bool, ManagementServer, false, \ 1833 "Create JMX Management Server") \ 1834 \ 1835 product(bool, DisableAttachMechanism, false, \ 1836 "Disable mechanism that allows tools to attach to this VM") \ 1837 \ 1838 product(bool, StartAttachListener, false, \ 1839 "Always start Attach Listener at VM startup") \ 1840 \ 1841 product(bool, EnableDynamicAgentLoading, true, \ 1842 "Allow tools to load agents with the attach mechanism") \ 1843 \ 1844 product(bool, PrintConcurrentLocks, false, MANAGEABLE, \ 1845 "Print java.util.concurrent locks in thread dump") \ 1846 \ 1847 /* Shared spaces */ \ 1848 \ 1849 product(bool, UseSharedSpaces, true, \ 1850 "Use shared spaces for metadata") \ 1851 \ 1852 product(bool, VerifySharedSpaces, false, \ 1853 "Verify integrity of shared spaces") \ 1854 \ 1855 product(bool, RequireSharedSpaces, false, \ 1856 "Require shared spaces for metadata") \ 1857 \ 1858 product(bool, DumpSharedSpaces, false, \ 1859 "Special mode: JVM reads a class list, loads classes, builds " \ 1860 "shared spaces, and dumps the shared spaces to a file to be " \ 1861 "used in future JVM runs") \ 1862 \ 1863 product(bool, DynamicDumpSharedSpaces, false, \ 1864 "Dynamic archive") \ 1865 \ 1866 product(bool, RecordDynamicDumpInfo, false, \ 1867 "Record class info for jcmd VM.cds dynamic_dump") \ 1868 \ 1869 product(bool, PrintSharedArchiveAndExit, false, \ 1870 "Print shared archive file contents") \ 1871 \ 1872 product(bool, PrintSharedDictionary, false, \ 1873 "If PrintSharedArchiveAndExit is true, also print the shared " \ 1874 "dictionary") \ 1875 \ 1876 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 1877 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 1878 "Address to allocate shared memory region for class data") \ 1879 range(0, SIZE_MAX) \ 1880 \ 1881 product(ccstr, SharedArchiveConfigFile, NULL, \ 1882 "Data to add to the CDS archive file") \ 1883 \ 1884 product(uintx, SharedSymbolTableBucketSize, 4, \ 1885 "Average number of symbols per bucket in shared table") \ 1886 range(2, 246) \ 1887 \ 1888 product(bool, AllowArchivingWithJavaAgent, false, DIAGNOSTIC, \ 1889 "Allow Java agent to be run with CDS dumping") \ 1890 \ 1891 product(bool, PrintMethodHandleStubs, false, DIAGNOSTIC, \ 1892 "Print generated stub code for method handles") \ 1893 \ 1894 product(bool, VerifyMethodHandles, trueInDebug, DIAGNOSTIC, \ 1895 "perform extra checks when constructing method handles") \ 1896 \ 1897 product(bool, ShowHiddenFrames, false, DIAGNOSTIC, \ 1898 "show method handle implementation frames (usually hidden)") \ 1899 \ 1900 product(bool, TrustFinalNonStaticFields, false, EXPERIMENTAL, \ 1901 "trust final non-static declarations for constant folding") \ 1902 \ 1903 product(bool, FoldStableValues, true, DIAGNOSTIC, \ 1904 "Optimize loads from stable fields (marked w/ @Stable)") \ 1905 \ 1906 product(int, UseBootstrapCallInfo, 1, DIAGNOSTIC, \ 1907 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 1908 "resolved before the bootstrap method is called; 1: when a BSM " \ 1909 "that may accept a BootstrapCallInfo is detected, use that API " \ 1910 "to pass BSM arguments, which allows the BSM to delay their " \ 1911 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 1912 "via that API, instead of with the eagerly-resolved array.") \ 1913 \ 1914 product(bool, PauseAtStartup, false, DIAGNOSTIC, \ 1915 "Causes the VM to pause at startup time and wait for the pause " \ 1916 "file to be removed (default: ./vm.paused.<pid>)") \ 1917 \ 1918 product(ccstr, PauseAtStartupFile, NULL, DIAGNOSTIC, \ 1919 "The file to create and for whose removal to await when pausing " \ 1920 "at startup. (default: ./vm.paused.<pid>)") \ 1921 \ 1922 product(bool, PauseAtExit, false, DIAGNOSTIC, \ 1923 "Pause and wait for keypress on exit if a debugger is attached") \ 1924 \ 1925 product(bool, ExtendedDTraceProbes, false, \ 1926 "Enable performance-impacting dtrace probes") \ 1927 \ 1928 product(bool, DTraceMethodProbes, false, \ 1929 "Enable dtrace probes for method-entry and method-exit") \ 1930 \ 1931 product(bool, DTraceAllocProbes, false, \ 1932 "Enable dtrace probes for object allocation") \ 1933 \ 1934 product(bool, DTraceMonitorProbes, false, \ 1935 "Enable dtrace probes for monitor events") \ 1936 \ 1937 product(bool, RelaxAccessControlCheck, false, \ 1938 "Relax the access control checks in the verifier") \ 1939 \ 1940 product(uintx, StringTableSize, defaultStringTableSize, \ 1941 "Number of buckets in the interned String table " \ 1942 "(will be rounded to nearest higher power of 2)") \ 1943 range(minimumStringTableSize, 16777216ul /* 2^24 */) \ 1944 \ 1945 product(uintx, SymbolTableSize, defaultSymbolTableSize, EXPERIMENTAL, \ 1946 "Number of buckets in the JVM internal Symbol table") \ 1947 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 1948 \ 1949 product(bool, UseStringDeduplication, false, \ 1950 "Use string deduplication") \ 1951 \ 1952 product(uint, StringDeduplicationAgeThreshold, 3, \ 1953 "A string must reach this age (or be promoted to an old region) " \ 1954 "to be considered for deduplication") \ 1955 range(1, markWord::max_age) \ 1956 \ 1957 product(size_t, StringDeduplicationInitialTableSize, 500, EXPERIMENTAL, \ 1958 "Approximate initial number of buckets in the table") \ 1959 range(1, 1 * G) \ 1960 \ 1961 product(double, StringDeduplicationGrowTableLoad, 14.0, EXPERIMENTAL, \ 1962 "Entries per bucket above which the table should be expanded") \ 1963 range(0.1, 1000.0) \ 1964 \ 1965 product(double, StringDeduplicationShrinkTableLoad, 1.0, EXPERIMENTAL, \ 1966 "Entries per bucket below which the table should be shrunk") \ 1967 range(0.01, 100.0) \ 1968 \ 1969 product(double, StringDeduplicationTargetTableLoad, 7.0, EXPERIMENTAL, \ 1970 "Desired entries per bucket when resizing the table") \ 1971 range(0.01, 1000.0) \ 1972 \ 1973 product(size_t, StringDeduplicationCleanupDeadMinimum, 100, EXPERIMENTAL, \ 1974 "Minimum number of dead table entries for cleaning the table") \ 1975 \ 1976 product(int, StringDeduplicationCleanupDeadPercent, 5, EXPERIMENTAL, \ 1977 "Minimum percentage of dead table entries for cleaning the table") \ 1978 range(1, 100) \ 1979 \ 1980 product(bool, StringDeduplicationResizeALot, false, DIAGNOSTIC, \ 1981 "Force more frequent table resizing") \ 1982 \ 1983 product(uint64_t, StringDeduplicationHashSeed, 0, DIAGNOSTIC, \ 1984 "Seed for the table hashing function; 0 requests computed seed") \ 1985 \ 1986 product(bool, WhiteBoxAPI, false, DIAGNOSTIC, \ 1987 "Enable internal testing APIs") \ 1988 \ 1989 product(ccstr, DumpLoadedClassList, NULL, \ 1990 "Dump the names all loaded classes, that could be stored into " \ 1991 "the CDS archive, in the specified file") \ 1992 \ 1993 product(ccstr, SharedClassListFile, NULL, \ 1994 "Override the default CDS class list") \ 1995 \ 1996 product(ccstr, SharedArchiveFile, NULL, \ 1997 "Override the default location of the CDS archive file") \ 1998 \ 1999 product(ccstr, ArchiveClassesAtExit, NULL, \ 2000 "The path and name of the dynamic archive file") \ 2001 \ 2002 product(ccstr, ExtraSharedClassListFile, NULL, \ 2003 "Extra classlist for building the CDS archive file") \ 2004 \ 2005 product(intx, ArchiveRelocationMode, 0, DIAGNOSTIC, \ 2006 "(0) first map at preferred address, and if " \ 2007 "unsuccessful, map at alternative address (default); " \ 2008 "(1) always map at alternative address; " \ 2009 "(2) always map at preferred address, and if unsuccessful, " \ 2010 "do not map the archive") \ 2011 range(0, 2) \ 2012 \ 2013 product(size_t, ArrayAllocatorMallocLimit, (size_t)-1, EXPERIMENTAL, \ 2014 "Allocation less than this value will be allocated " \ 2015 "using malloc. Larger allocations will use mmap.") \ 2016 \ 2017 product(bool, AlwaysAtomicAccesses, false, EXPERIMENTAL, \ 2018 "Accesses to all variables should always be atomic") \ 2019 \ 2020 product(bool, UseUnalignedAccesses, false, DIAGNOSTIC, \ 2021 "Use unaligned memory accesses in Unsafe") \ 2022 \ 2023 product_pd(bool, PreserveFramePointer, \ 2024 "Use the FP register for holding the frame pointer " \ 2025 "and not as a general purpose register.") \ 2026 \ 2027 product(size_t, AsyncLogBufferSize, 2*M, \ 2028 "Memory budget (in bytes) for the buffer of Asynchronous " \ 2029 "Logging (-Xlog:async).") \ 2030 range(100*K, 50*M) \ 2031 \ 2032 product(bool, CheckIntrinsics, true, DIAGNOSTIC, \ 2033 "When a class C is loaded, check that " \ 2034 "(1) all intrinsics defined by the VM for class C are present "\ 2035 "in the loaded class file and are marked with the " \ 2036 "@IntrinsicCandidate annotation, that " \ 2037 "(2) there is an intrinsic registered for all loaded methods " \ 2038 "that are annotated with the @IntrinsicCandidate annotation, " \ 2039 "and that " \ 2040 "(3) no orphan methods exist for class C (i.e., methods for " \ 2041 "which the VM declares an intrinsic but that are not declared "\ 2042 "in the loaded class C. " \ 2043 "Check (3) is available only in debug builds.") \ 2044 \ 2045 product_pd(intx, InitArrayShortSize, DIAGNOSTIC, \ 2046 "Threshold small size (in bytes) for clearing arrays. " \ 2047 "Anything this size or smaller may get converted to discrete " \ 2048 "scalar stores.") \ 2049 range(0, max_intx) \ 2050 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2051 \ 2052 product(ccstr, AllocateHeapAt, NULL, \ 2053 "Path to the directory where a temporary file will be created " \ 2054 "to use as the backing store for Java Heap.") \ 2055 \ 2056 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2057 "Run periodic metaspace verifications (0 - none, " \ 2058 "1 - always, >1 every nth interval)") \ 2059 \ 2060 product(bool, ShowRegistersOnAssert, true, DIAGNOSTIC, \ 2061 "On internal errors, include registers in error report.") \ 2062 \ 2063 product(bool, UseSwitchProfiling, true, DIAGNOSTIC, \ 2064 "leverage profiling for table/lookup switch") \ 2065 \ 2066 develop(bool, TraceMemoryWriteback, false, \ 2067 "Trace memory writeback operations") \ 2068 \ 2069 JFR_ONLY(product(bool, FlightRecorder, false, \ 2070 "(Deprecated) Enable Flight Recorder")) \ 2071 \ 2072 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2073 "Flight Recorder options")) \ 2074 \ 2075 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2076 "Start flight recording with options")) \ 2077 \ 2078 product(bool, UseFastUnorderedTimeStamps, false, EXPERIMENTAL, \ 2079 "Use platform unstable time where supported for timestamps only") \ 2080 \ 2081 product(bool, UseEmptySlotsInSupers, true, \ 2082 "Allow allocating fields in empty slots of super-classes") \ 2083 \ 2084 product(bool, DeoptimizeNMethodBarriersALot, false, DIAGNOSTIC, \ 2085 "Make nmethod barriers deoptimise a lot.") \ 2086 \ 2087 develop(bool, VerifyCrossModifyFence, \ 2088 false AARCH64_ONLY(DEBUG_ONLY(||true)), \ 2089 "Mark all threads after a safepoint, and clear on a modify " \ 2090 "fence. Add cleanliness checks.") \ 2091 \ 2092 product(bool, HeapObjectStats, false, DIAGNOSTIC, \ 2093 "Enable gathering of heap object statistics") \ 2094 \ 2095 product(size_t, HeapObjectStatsSamplingInterval, 500, DIAGNOSTIC, \ 2096 "Heap object statistics sampling interval (ms)") \ 2097 \ 2098 product(bool, UseFastLocking, false, EXPERIMENTAL, \ 2099 "Use fast-locking instead of stack-locking") \ 2100 \ 2101 develop(bool, TraceOptimizedUpcallStubs, false, \ 2102 "Trace optimized upcall stub generation") \ 2103 2104 // end of RUNTIME_FLAGS 2105 2106 DECLARE_FLAGS(LP64_RUNTIME_FLAGS) 2107 DECLARE_ARCH_FLAGS(ARCH_FLAGS) 2108 DECLARE_FLAGS(RUNTIME_FLAGS) 2109 DECLARE_FLAGS(RUNTIME_OS_FLAGS) 2110 2111 #endif // SHARE_RUNTIME_GLOBALS_HPP