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