1 /* 2 * Copyright (c) 1997, 2019, 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.hpp" 29 #include "gc/shared/gc_globals.hpp" 30 #include "runtime/globals_shared.hpp" 31 #include "utilities/align.hpp" 32 #include "utilities/globalDefinitions.hpp" 33 #include "utilities/macros.hpp" 34 #include CPU_HEADER(globals) 35 #include OS_HEADER(globals) 36 #include OS_CPU_HEADER(globals) 37 38 // develop flags are settable / visible only during development and are constant in the PRODUCT version 39 // product flags are always settable / visible 40 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 41 42 // A flag must be declared with one of the following types: 43 // bool, int, uint, intx, uintx, size_t, ccstr, ccstrlist, double, or uint64_t. 44 // The type "ccstr" and "ccstrlist" are an alias for "const char*" and is used 45 // only in this file, because the macrology requires single-token type names. 46 47 // Note: Diagnostic options not meant for VM tuning or for product modes. 48 // They are to be used for VM quality assurance or field diagnosis 49 // of VM bugs. They are hidden so that users will not be encouraged to 50 // try them as if they were VM ordinary execution options. However, they 51 // are available in the product version of the VM. Under instruction 52 // from support engineers, VM customers can turn them on to collect 53 // diagnostic information about VM problems. To use a VM diagnostic 54 // option, you must first specify +UnlockDiagnosticVMOptions. 55 // (This master switch also affects the behavior of -Xprintflags.) 56 // 57 // experimental flags are in support of features that are not 58 // part of the officially supported product, but are available 59 // for experimenting with. They could, for example, be performance 60 // features that may not have undergone full or rigorous QA, but which may 61 // help performance in some cases and released for experimentation 62 // by the community of users and developers. This flag also allows one to 63 // be able to build a fully supported product that nonetheless also 64 // ships with some unsupported, lightly tested, experimental features. 65 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 66 // UnlockExperimentalVMOptions flag, which allows the control and 67 // modification of the experimental flags. 68 // 69 // Nota bene: neither diagnostic nor experimental options should be used casually, 70 // and they are not supported on production loads, except under explicit 71 // direction from support engineers. 72 // 73 // manageable flags are writeable external product flags. 74 // They are dynamically writeable through the JDK management interface 75 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 76 // These flags are external exported interface (see CCC). The list of 77 // manageable flags can be queried programmatically through the management 78 // interface. 79 // 80 // A flag can be made as "manageable" only if 81 // - the flag is defined in a CCC as an external exported interface. 82 // - the VM implementation supports dynamic setting of the flag. 83 // This implies that the VM must *always* query the flag variable 84 // and not reuse state related to the flag state at any given time. 85 // - you want the flag to be queried programmatically by the customers. 86 // 87 // product_rw flags are writeable internal product flags. 88 // They are like "manageable" flags but for internal/private use. 89 // The list of product_rw flags are internal/private flags which 90 // may be changed/removed in a future release. It can be set 91 // through the management interface to get/set value 92 // when the name of flag is supplied. 93 // 94 // A flag can be made as "product_rw" only if 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 // 99 // Note that when there is a need to support develop flags to be writeable, 100 // it can be done in the same way as product_rw. 101 // 102 // range is a macro that will expand to min and max arguments for range 103 // checking code if provided - see jvmFlagRangeList.hpp 104 // 105 // constraint is a macro that will expand to custom function call 106 // for constraint checking if provided - see jvmFlagConstraintList.hpp 107 // 108 // writeable is a macro that controls if and how the value can change during the runtime 109 // 110 // writeable(Always) is optional and allows the flag to have its value changed 111 // without any limitations at any time 112 // 113 // writeable(Once) flag value's can be only set once during the lifetime of VM 114 // 115 // writeable(CommandLineOnly) flag value's can be only set from command line 116 // (multiple times allowed) 117 // 118 119 // Default and minimum StringTable and SymbolTable size values 120 // Must be powers of 2 121 const size_t defaultStringTableSize = NOT_LP64(1024) LP64_ONLY(65536); 122 const size_t minimumStringTableSize = 128; 123 const size_t defaultSymbolTableSize = 32768; // 2^15 124 const size_t minimumSymbolTableSize = 1024; 125 126 #define RUNTIME_FLAGS(develop, \ 127 develop_pd, \ 128 product, \ 129 product_pd, \ 130 diagnostic, \ 131 diagnostic_pd, \ 132 experimental, \ 133 notproduct, \ 134 manageable, \ 135 product_rw, \ 136 lp64_product, \ 137 range, \ 138 constraint, \ 139 writeable) \ 140 \ 141 lp64_product(bool, UseCompressedOops, false, \ 142 "Use 32-bit object references in 64-bit VM. " \ 143 "lp64_product means flag is always constant in 32 bit VM") \ 144 \ 145 lp64_product(bool, UseCompressedClassPointers, false, \ 146 "Use 32-bit class pointers in 64-bit VM. " \ 147 "lp64_product means flag is always constant in 32 bit VM") \ 148 \ 149 notproduct(bool, CheckCompressedOops, true, \ 150 "Generate checks in encoding/decoding code in debug VM") \ 151 \ 152 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 153 "Heap allocation steps through preferred address regions to find" \ 154 " where it can allocate the heap. Number of steps to take per " \ 155 "region.") \ 156 range(1, max_uintx) \ 157 \ 158 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 159 "Default object alignment in bytes, 8 is minimum") \ 160 range(8, 256) \ 161 constraint(ObjectAlignmentInBytesConstraintFunc,AtParse) \ 162 \ 163 develop(bool, CleanChunkPoolAsync, true, \ 164 "Clean the chunk pool asynchronously") \ 165 \ 166 product_pd(bool, ThreadLocalHandshakes, \ 167 "Use thread-local polls instead of global poll for safepoints.") \ 168 constraint(ThreadLocalHandshakesConstraintFunc,AfterErgo) \ 169 \ 170 diagnostic(uint, HandshakeTimeout, 0, \ 171 "If nonzero set a timeout in milliseconds for handshakes") \ 172 \ 173 experimental(bool, AlwaysSafeConstructors, false, \ 174 "Force safe construction, as if all fields are final.") \ 175 \ 176 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 177 "Enable normal processing of flags relating to field diagnostics")\ 178 \ 179 experimental(bool, UnlockExperimentalVMOptions, false, \ 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, UseLargePagesInMetaspace, false, \ 197 "Use large page memory in metaspace. " \ 198 "Only used if UseLargePages is enabled.") \ 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 range(os::vm_allocation_granularity(), NOT_LP64(2*G) LP64_ONLY(8192*G)) \ 209 \ 210 product(bool, ForceNUMA, false, \ 211 "Force NUMA optimizations on single-node/UMA systems") \ 212 \ 213 product(uintx, NUMAChunkResizeWeight, 20, \ 214 "Percentage (0-100) used to weight the current sample when " \ 215 "computing exponentially decaying average for " \ 216 "AdaptiveNUMAChunkSizing") \ 217 range(0, 100) \ 218 \ 219 product(size_t, NUMASpaceResizeRate, 1*G, \ 220 "Do not reallocate more than this amount per collection") \ 221 range(0, max_uintx) \ 222 \ 223 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 224 "Enable adaptive chunk sizing for NUMA") \ 225 \ 226 product(bool, NUMAStats, false, \ 227 "Print NUMA stats in detailed heap information") \ 228 \ 229 product(uintx, NUMAPageScanRate, 256, \ 230 "Maximum number of pages to include in the page scan procedure") \ 231 range(0, max_uintx) \ 232 \ 233 product(intx, UseSSE, 99, \ 234 "Highest supported SSE instructions set on x86/x64") \ 235 range(0, 99) \ 236 \ 237 product(bool, UseAES, false, \ 238 "Control whether AES instructions are used when available") \ 239 \ 240 product(bool, UseFMA, false, \ 241 "Control whether FMA instructions are used when available") \ 242 \ 243 product(bool, UseSHA, false, \ 244 "Control whether SHA instructions are used when available") \ 245 \ 246 diagnostic(bool, UseGHASHIntrinsics, false, \ 247 "Use intrinsics for GHASH versions of crypto") \ 248 \ 249 product(bool, UseBASE64Intrinsics, false, \ 250 "Use intrinsics for java.util.Base64") \ 251 \ 252 product(size_t, LargePageSizeInBytes, 0, \ 253 "Large page size (0 to let VM choose the page size)") \ 254 range(0, max_uintx) \ 255 \ 256 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 257 "Use large pages if maximum heap is at least this big") \ 258 range(0, max_uintx) \ 259 \ 260 product(bool, ForceTimeHighResolution, false, \ 261 "Using high time resolution (for Win32 only)") \ 262 \ 263 develop(bool, TracePcPatching, false, \ 264 "Trace usage of frame::patch_pc") \ 265 \ 266 develop(bool, TraceRelocator, false, \ 267 "Trace the bytecode relocator") \ 268 \ 269 develop(bool, TraceLongCompiles, false, \ 270 "Print out every time compilation is longer than " \ 271 "a given threshold") \ 272 \ 273 diagnostic(bool, SafepointALot, false, \ 274 "Generate a lot of safepoints. This works with " \ 275 "GuaranteedSafepointInterval") \ 276 \ 277 diagnostic(bool, HandshakeALot, false, \ 278 "Generate a lot of handshakes. This works with " \ 279 "GuaranteedSafepointInterval") \ 280 \ 281 product_pd(bool, BackgroundCompilation, \ 282 "A thread requesting compilation is not blocked during " \ 283 "compilation") \ 284 \ 285 product(bool, PrintVMQWaitTime, false, \ 286 "Print out the waiting time in VM operation queue") \ 287 \ 288 product(bool, MethodFlushing, true, \ 289 "Reclamation of zombie and not-entrant methods") \ 290 \ 291 develop(bool, VerifyStack, false, \ 292 "Verify stack of each thread when it is entering a runtime call") \ 293 \ 294 diagnostic(bool, ForceUnreachable, false, \ 295 "Make all non code cache addresses to be unreachable by " \ 296 "forcing use of 64bit literal fixups") \ 297 \ 298 notproduct(bool, StressDerivedPointers, false, \ 299 "Force scavenge when a derived pointer is detected on stack " \ 300 "after rtm call") \ 301 \ 302 develop(bool, TraceDerivedPointers, false, \ 303 "Trace traversal of derived pointers on stack") \ 304 \ 305 notproduct(bool, TraceCodeBlobStacks, false, \ 306 "Trace stack-walk of codeblobs") \ 307 \ 308 product(bool, PrintJNIResolving, false, \ 309 "Used to implement -v:jni") \ 310 \ 311 notproduct(bool, PrintRewrites, false, \ 312 "Print methods that are being rewritten") \ 313 \ 314 product(bool, UseInlineCaches, true, \ 315 "Use Inline Caches for virtual calls ") \ 316 \ 317 diagnostic(bool, InlineArrayCopy, true, \ 318 "Inline arraycopy native that is known to be part of " \ 319 "base library DLL") \ 320 \ 321 diagnostic(bool, InlineObjectHash, true, \ 322 "Inline Object::hashCode() native that is known to be part " \ 323 "of base library DLL") \ 324 \ 325 diagnostic(bool, InlineNatives, true, \ 326 "Inline natives that are known to be part of base library DLL") \ 327 \ 328 diagnostic(bool, InlineMathNatives, true, \ 329 "Inline SinD, CosD, etc.") \ 330 \ 331 diagnostic(bool, InlineClassNatives, true, \ 332 "Inline Class.isInstance, etc") \ 333 \ 334 diagnostic(bool, InlineThreadNatives, true, \ 335 "Inline Thread.currentThread, etc") \ 336 \ 337 diagnostic(bool, InlineUnsafeOps, true, \ 338 "Inline memory ops (native methods) from Unsafe") \ 339 \ 340 product(bool, CriticalJNINatives, true, \ 341 "Check for critical JNI entry points") \ 342 \ 343 notproduct(bool, StressCriticalJNINatives, false, \ 344 "Exercise register saving code in critical natives") \ 345 \ 346 diagnostic(bool, UseAESIntrinsics, false, \ 347 "Use intrinsics for AES versions of crypto") \ 348 \ 349 diagnostic(bool, UseAESCTRIntrinsics, false, \ 350 "Use intrinsics for the paralleled version of AES/CTR crypto") \ 351 \ 352 diagnostic(bool, UseSHA1Intrinsics, false, \ 353 "Use intrinsics for SHA-1 crypto hash function. " \ 354 "Requires that UseSHA is enabled.") \ 355 \ 356 diagnostic(bool, UseSHA256Intrinsics, false, \ 357 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions. " \ 358 "Requires that UseSHA is enabled.") \ 359 \ 360 diagnostic(bool, UseSHA512Intrinsics, false, \ 361 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions. " \ 362 "Requires that UseSHA is enabled.") \ 363 \ 364 diagnostic(bool, UseCRC32Intrinsics, false, \ 365 "use intrinsics for java.util.zip.CRC32") \ 366 \ 367 diagnostic(bool, UseCRC32CIntrinsics, false, \ 368 "use intrinsics for java.util.zip.CRC32C") \ 369 \ 370 diagnostic(bool, UseAdler32Intrinsics, false, \ 371 "use intrinsics for java.util.zip.Adler32") \ 372 \ 373 diagnostic(bool, UseVectorizedMismatchIntrinsic, false, \ 374 "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \ 375 \ 376 diagnostic(ccstrlist, DisableIntrinsic, "", \ 377 "do not expand intrinsics whose (internal) names appear here") \ 378 \ 379 develop(bool, TraceCallFixup, false, \ 380 "Trace all call fixups") \ 381 \ 382 develop(bool, DeoptimizeALot, false, \ 383 "Deoptimize at every exit from the runtime system") \ 384 \ 385 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 386 "A comma separated list of bcis to deoptimize at") \ 387 \ 388 product(bool, DeoptimizeRandom, false, \ 389 "Deoptimize random frames on random exit from the runtime system")\ 390 \ 391 notproduct(bool, ZombieALot, false, \ 392 "Create zombies (non-entrant) at exit from the runtime system") \ 393 \ 394 notproduct(bool, WalkStackALot, false, \ 395 "Trace stack (no print) at every exit from the runtime system") \ 396 \ 397 product(bool, Debugging, false, \ 398 "Set when executing debug methods in debug.cpp " \ 399 "(to prevent triggering assertions)") \ 400 \ 401 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 402 "Enable strict checks that safepoints cannot happen for threads " \ 403 "that use NoSafepointVerifier") \ 404 \ 405 notproduct(bool, VerifyLastFrame, false, \ 406 "Verify oops on last frame on entry to VM") \ 407 \ 408 product(bool, SafepointTimeout, false, \ 409 "Time out and warn or fail after SafepointTimeoutDelay " \ 410 "milliseconds if failed to reach safepoint") \ 411 \ 412 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 413 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 414 \ 415 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 416 "Abort upon failure to complete VM operation promptly") \ 417 \ 418 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 419 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 420 range(0, max_intx) \ 421 \ 422 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 423 /* typically, at most a few retries are needed */ \ 424 product(intx, SuspendRetryCount, 50, \ 425 "Maximum retry count for an external suspend request") \ 426 range(0, max_intx) \ 427 \ 428 product(intx, SuspendRetryDelay, 5, \ 429 "Milliseconds to delay per retry (* current_retry_count)") \ 430 range(0, max_intx) \ 431 \ 432 product(bool, AssertOnSuspendWaitFailure, false, \ 433 "Assert/Guarantee on external suspend wait failure") \ 434 \ 435 product(bool, TraceSuspendWaitFailures, false, \ 436 "Trace external suspend wait failures") \ 437 \ 438 product(bool, MaxFDLimit, true, \ 439 "Bump the number of file descriptors to maximum in Solaris") \ 440 \ 441 diagnostic(bool, LogEvents, true, \ 442 "Enable the various ring buffer event logs") \ 443 \ 444 diagnostic(uintx, LogEventsBufferEntries, 20, \ 445 "Number of ring buffer event logs") \ 446 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 447 \ 448 diagnostic(bool, BytecodeVerificationRemote, true, \ 449 "Enable the Java bytecode verifier for remote classes") \ 450 \ 451 diagnostic(bool, BytecodeVerificationLocal, false, \ 452 "Enable the Java bytecode verifier for local classes") \ 453 \ 454 develop(bool, ForceFloatExceptions, trueInDebug, \ 455 "Force exceptions on FP stack under/overflow") \ 456 \ 457 develop(bool, VerifyStackAtCalls, false, \ 458 "Verify that the stack pointer is unchanged after calls") \ 459 \ 460 develop(bool, TraceJavaAssertions, false, \ 461 "Trace java language assertions") \ 462 \ 463 notproduct(bool, VerifyCodeCache, false, \ 464 "Verify code cache on memory allocation/deallocation") \ 465 \ 466 develop(bool, UseMallocOnly, false, \ 467 "Use only malloc/free for allocation (no resource area/arena)") \ 468 \ 469 develop(bool, ZapResourceArea, trueInDebug, \ 470 "Zap freed resource/arena space with 0xABABABAB") \ 471 \ 472 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 473 "Zap freed VM handle space with 0xBCBCBCBC") \ 474 \ 475 notproduct(bool, ZapStackSegments, trueInDebug, \ 476 "Zap allocated/freed stack segments with 0xFADFADED") \ 477 \ 478 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 479 "Zap unused heap space with 0xBAADBABE") \ 480 \ 481 develop(bool, CheckZapUnusedHeapArea, false, \ 482 "Check zapping of unused heap space") \ 483 \ 484 develop(bool, ZapFillerObjects, trueInDebug, \ 485 "Zap filler objects with 0xDEAFBABE") \ 486 \ 487 develop(bool, PrintVMMessages, true, \ 488 "Print VM messages on console") \ 489 \ 490 notproduct(uintx, ErrorHandlerTest, 0, \ 491 "If > 0, provokes an error after VM initialization; the value " \ 492 "determines which error to provoke. See test_error_handler() " \ 493 "in vmError.cpp.") \ 494 \ 495 notproduct(uintx, TestCrashInErrorHandler, 0, \ 496 "If > 0, provokes an error inside VM error handler (a secondary " \ 497 "crash). see test_error_handler() in vmError.cpp") \ 498 \ 499 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 500 "If true, tests SafeFetch inside error handler.") \ 501 \ 502 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 503 "If true, simulates an unresponsive error handler.") \ 504 \ 505 develop(bool, Verbose, false, \ 506 "Print additional debugging information from other modes") \ 507 \ 508 develop(bool, PrintMiscellaneous, false, \ 509 "Print uncategorized debugging information (requires +Verbose)") \ 510 \ 511 develop(bool, WizardMode, false, \ 512 "Print much more debugging information") \ 513 \ 514 product(bool, ShowMessageBoxOnError, false, \ 515 "Keep process alive on VM fatal error") \ 516 \ 517 product(bool, CreateCoredumpOnCrash, true, \ 518 "Create core/mini dump on VM fatal error") \ 519 \ 520 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 521 "Timeout, in seconds, to limit the time spent on writing an " \ 522 "error log in case of a crash.") \ 523 range(0, (uint64_t)max_jlong/1000) \ 524 \ 525 product_pd(bool, UseOSErrorReporting, \ 526 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 527 \ 528 product(bool, SuppressFatalErrorMessage, false, \ 529 "Report NO fatal error message (avoid deadlock)") \ 530 \ 531 product(ccstrlist, OnError, "", \ 532 "Run user-defined commands on fatal error; see VMError.cpp " \ 533 "for examples") \ 534 \ 535 product(ccstrlist, OnOutOfMemoryError, "", \ 536 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 537 \ 538 manageable(bool, HeapDumpBeforeFullGC, false, \ 539 "Dump heap to file before any major stop-the-world GC") \ 540 \ 541 manageable(bool, HeapDumpAfterFullGC, false, \ 542 "Dump heap to file after any major stop-the-world GC") \ 543 \ 544 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 545 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 546 \ 547 manageable(ccstr, HeapDumpPath, NULL, \ 548 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 549 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 550 "in the working directory)") \ 551 \ 552 develop(bool, BreakAtWarning, false, \ 553 "Execute breakpoint upon encountering VM warning") \ 554 \ 555 product(ccstr, NativeMemoryTracking, "off", \ 556 "Native memory tracking options") \ 557 \ 558 diagnostic(bool, PrintNMTStatistics, false, \ 559 "Print native memory tracking summary data if it is on") \ 560 \ 561 diagnostic(bool, LogCompilation, false, \ 562 "Log compilation activity in detail to LogFile") \ 563 \ 564 product(bool, PrintCompilation, false, \ 565 "Print compilations") \ 566 \ 567 product(bool, PrintExtendedThreadInfo, false, \ 568 "Print more information in thread dump") \ 569 \ 570 diagnostic(bool, TraceNMethodInstalls, false, \ 571 "Trace nmethod installation") \ 572 \ 573 diagnostic(intx, ScavengeRootsInCode, 2, \ 574 "0: do not allow scavengable oops in the code cache; " \ 575 "1: allow scavenging from the code cache; " \ 576 "2: emit as many constants as the compiler can see") \ 577 range(0, 2) \ 578 \ 579 product(bool, AlwaysRestoreFPU, false, \ 580 "Restore the FPU control word after every JNI call (expensive)") \ 581 \ 582 diagnostic(bool, PrintCompilation2, false, \ 583 "Print additional statistics per compilation") \ 584 \ 585 diagnostic(bool, PrintAdapterHandlers, false, \ 586 "Print code generated for i2c/c2i adapters") \ 587 \ 588 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 589 "Verify that i2c/c2i adapters are called properly") \ 590 \ 591 develop(bool, VerifyAdapterSharing, false, \ 592 "Verify that the code for shared adapters is the equivalent") \ 593 \ 594 diagnostic(bool, PrintAssembly, false, \ 595 "Print assembly code (using external disassembler.so)") \ 596 \ 597 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 598 "Print options string passed to disassembler.so") \ 599 \ 600 notproduct(bool, PrintNMethodStatistics, false, \ 601 "Print a summary statistic for the generated nmethods") \ 602 \ 603 diagnostic(bool, PrintNMethods, false, \ 604 "Print assembly code for nmethods when generated") \ 605 \ 606 diagnostic(bool, PrintNativeNMethods, false, \ 607 "Print assembly code for native nmethods when generated") \ 608 \ 609 develop(bool, PrintDebugInfo, false, \ 610 "Print debug information for all nmethods when generated") \ 611 \ 612 develop(bool, PrintRelocations, false, \ 613 "Print relocation information for all nmethods when generated") \ 614 \ 615 develop(bool, PrintDependencies, false, \ 616 "Print dependency information for all nmethods when generated") \ 617 \ 618 develop(bool, PrintExceptionHandlers, false, \ 619 "Print exception handler tables for all nmethods when generated") \ 620 \ 621 develop(bool, StressCompiledExceptionHandlers, false, \ 622 "Exercise compiled exception handlers") \ 623 \ 624 develop(bool, InterceptOSException, false, \ 625 "Start debugger when an implicit OS (e.g. NULL) " \ 626 "exception happens") \ 627 \ 628 product(bool, PrintCodeCache, false, \ 629 "Print the code cache memory usage when exiting") \ 630 \ 631 develop(bool, PrintCodeCache2, false, \ 632 "Print detailed usage information on the code cache when exiting")\ 633 \ 634 product(bool, PrintCodeCacheOnCompilation, false, \ 635 "Print the code cache memory usage each time a method is " \ 636 "compiled") \ 637 \ 638 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 639 "Print code heap usage statistics on exit and on full condition") \ 640 \ 641 diagnostic(bool, PrintStubCode, false, \ 642 "Print generated stub code") \ 643 \ 644 product(bool, StackTraceInThrowable, true, \ 645 "Collect backtrace in throwable when exception happens") \ 646 \ 647 product(bool, OmitStackTraceInFastThrow, true, \ 648 "Omit backtraces for some 'hot' exceptions in optimized code") \ 649 \ 650 product(bool, PrintWarnings, true, \ 651 "Print JVM warnings to output stream") \ 652 \ 653 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 654 "Print warnings for stalled SpinLocks") \ 655 \ 656 product(bool, RegisterFinalizersAtInit, true, \ 657 "Register finalizable objects at end of Object.<init> or " \ 658 "after allocation") \ 659 \ 660 develop(bool, RegisterReferences, true, \ 661 "Tell whether the VM should register soft/weak/final/phantom " \ 662 "references") \ 663 \ 664 develop(bool, IgnoreRewrites, false, \ 665 "Suppress rewrites of bytecodes in the oopmap generator. " \ 666 "This is unsafe!") \ 667 \ 668 develop(bool, PrintCodeCacheExtension, false, \ 669 "Print extension of code cache") \ 670 \ 671 develop(bool, UsePrivilegedStack, true, \ 672 "Enable the security JVM functions") \ 673 \ 674 develop(bool, ProtectionDomainVerification, true, \ 675 "Verify protection domain before resolution in system dictionary")\ 676 \ 677 product(bool, ClassUnloading, true, \ 678 "Do unloading of classes") \ 679 \ 680 product(bool, ClassUnloadingWithConcurrentMark, true, \ 681 "Do unloading of classes with a concurrent marking cycle") \ 682 \ 683 develop(bool, DisableStartThread, false, \ 684 "Disable starting of additional Java threads " \ 685 "(for debugging only)") \ 686 \ 687 develop(bool, MemProfiling, false, \ 688 "Write memory usage profiling to log file") \ 689 \ 690 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 691 "Print the system dictionary at exit") \ 692 \ 693 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 694 "Dynamically resize system dictionaries as needed") \ 695 \ 696 product(bool, AlwaysLockClassLoader, false, \ 697 "Require the VM to acquire the class loader lock before calling " \ 698 "loadClass() even for class loaders registering " \ 699 "as parallel capable") \ 700 \ 701 product(bool, AllowParallelDefineClass, false, \ 702 "Allow parallel defineClass requests for class loaders " \ 703 "registering as parallel capable") \ 704 \ 705 product_pd(bool, DontYieldALot, \ 706 "Throw away obvious excess yield calls") \ 707 \ 708 develop(bool, UseDetachedThreads, true, \ 709 "Use detached threads that are recycled upon termination " \ 710 "(for Solaris only)") \ 711 \ 712 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 713 "Disable the use of stack guard pages if the JVM is loaded " \ 714 "on the primordial process thread") \ 715 \ 716 product(bool, UseLWPSynchronization, true, \ 717 "Use LWP-based instead of libthread-based synchronization " \ 718 "(SPARC only)") \ 719 \ 720 product(intx, MonitorBound, 0, "Bound Monitor population") \ 721 range(0, max_jint) \ 722 \ 723 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 724 "Percentage of used monitors before triggering cleanup " \ 725 "safepoint which deflates monitors (0 is off). " \ 726 "The check is performed on GuaranteedSafepointInterval.") \ 727 range(0, 100) \ 728 \ 729 experimental(intx, hashCode, 5, \ 730 "(Unstable) select hashCode generation algorithm") \ 731 \ 732 product(bool, FilterSpuriousWakeups, true, \ 733 "When true prevents OS-level spurious, or premature, wakeups " \ 734 "from Object.wait (Ignored for Windows)") \ 735 \ 736 develop(bool, UsePthreads, false, \ 737 "Use pthread-based instead of libthread-based synchronization " \ 738 "(SPARC only)") \ 739 \ 740 product(bool, ReduceSignalUsage, false, \ 741 "Reduce the use of OS signals in Java and/or the VM") \ 742 \ 743 develop_pd(bool, ShareVtableStubs, \ 744 "Share vtable stubs (smaller code but worse branch prediction") \ 745 \ 746 develop(bool, LoadLineNumberTables, true, \ 747 "Tell whether the class file parser loads line number tables") \ 748 \ 749 develop(bool, LoadLocalVariableTables, true, \ 750 "Tell whether the class file parser loads local variable tables") \ 751 \ 752 develop(bool, LoadLocalVariableTypeTables, true, \ 753 "Tell whether the class file parser loads local variable type" \ 754 "tables") \ 755 \ 756 product(bool, AllowUserSignalHandlers, false, \ 757 "Do not complain if the application installs signal handlers " \ 758 "(Solaris & Linux only)") \ 759 \ 760 product(bool, UseSignalChaining, true, \ 761 "Use signal-chaining to invoke signal handlers installed " \ 762 "by the application (Solaris & Linux only)") \ 763 \ 764 product(bool, RestoreMXCSROnJNICalls, false, \ 765 "Restore MXCSR when returning from JNI calls") \ 766 \ 767 product(bool, CheckJNICalls, false, \ 768 "Verify all arguments to JNI calls") \ 769 \ 770 product(bool, UseFastJNIAccessors, true, \ 771 "Use optimized versions of Get<Primitive>Field") \ 772 \ 773 product(intx, MaxJNILocalCapacity, 65536, \ 774 "Maximum allowable local JNI handle capacity to " \ 775 "EnsureLocalCapacity() and PushLocalFrame(), " \ 776 "where <= 0 is unlimited, default: 65536") \ 777 range(min_intx, max_intx) \ 778 \ 779 product(bool, EagerXrunInit, false, \ 780 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 781 "but not all -Xrun libraries may support the state of the VM " \ 782 "at this time") \ 783 \ 784 product(bool, PreserveAllAnnotations, false, \ 785 "Preserve RuntimeInvisibleAnnotations as well " \ 786 "as RuntimeVisibleAnnotations") \ 787 \ 788 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 789 "Number of OutOfMemoryErrors preallocated with backtrace") \ 790 \ 791 product(bool, UseXMMForArrayCopy, false, \ 792 "Use SSE2 MOVQ instruction for Arraycopy") \ 793 \ 794 product(intx, FieldsAllocationStyle, 1, \ 795 "0 - type based with oops first, " \ 796 "1 - with oops last, " \ 797 "2 - oops in super and sub classes are together") \ 798 range(0, 2) \ 799 \ 800 product(bool, CompactFields, true, \ 801 "Allocate nonstatic fields in gaps between previous fields") \ 802 \ 803 notproduct(bool, PrintFieldLayout, false, \ 804 "Print field layout for each class") \ 805 \ 806 /* Need to limit the extent of the padding to reasonable size. */\ 807 /* 8K is well beyond the reasonable HW cache line size, even with */\ 808 /* aggressive prefetching, while still leaving the room for segregating */\ 809 /* among the distinct pages. */\ 810 product(intx, ContendedPaddingWidth, 128, \ 811 "How many bytes to pad the fields/classes marked @Contended with")\ 812 range(0, 8192) \ 813 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 814 \ 815 product(bool, EnableContended, true, \ 816 "Enable @Contended annotation support") \ 817 \ 818 product(bool, RestrictContended, true, \ 819 "Restrict @Contended to trusted classes") \ 820 \ 821 product(bool, UseBiasedLocking, true, \ 822 "Enable biased locking in JVM") \ 823 \ 824 product(intx, BiasedLockingStartupDelay, 0, \ 825 "Number of milliseconds to wait before enabling biased locking") \ 826 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 827 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 828 \ 829 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 830 "Print statistics of biased locking in JVM") \ 831 \ 832 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 833 "Threshold of number of revocations per type to try to " \ 834 "rebias all objects in the heap of that type") \ 835 range(0, max_intx) \ 836 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 837 \ 838 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 839 "Threshold of number of revocations per type to permanently " \ 840 "revoke biases of all objects in the heap of that type") \ 841 range(0, max_intx) \ 842 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 843 \ 844 product(intx, BiasedLockingDecayTime, 25000, \ 845 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 846 "type after previous bulk rebias") \ 847 range(500, max_intx) \ 848 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 849 \ 850 product(bool, ExitOnOutOfMemoryError, false, \ 851 "JVM exits on the first occurrence of an out-of-memory error") \ 852 \ 853 product(bool, CrashOnOutOfMemoryError, false, \ 854 "JVM aborts, producing an error log and core/mini dump, on the " \ 855 "first occurrence of an out-of-memory error") \ 856 \ 857 /* tracing */ \ 858 \ 859 develop(bool, StressRewriter, false, \ 860 "Stress linktime bytecode rewriting") \ 861 \ 862 product(ccstr, TraceJVMTI, NULL, \ 863 "Trace flags for JVMTI functions and events") \ 864 \ 865 /* This option can change an EMCP method into an obsolete method. */ \ 866 /* This can affect tests that except specific methods to be EMCP. */ \ 867 /* This option should be used with caution. */ \ 868 product(bool, StressLdcRewrite, false, \ 869 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 870 \ 871 /* change to false by default sometime after Mustang */ \ 872 product(bool, VerifyMergedCPBytecodes, true, \ 873 "Verify bytecodes after RedefineClasses constant pool merging") \ 874 \ 875 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 876 "(Deprecated) Allow redefinition to add and delete private " \ 877 "static or final methods for compatibility with old releases") \ 878 \ 879 develop(bool, TraceBytecodes, false, \ 880 "Trace bytecode execution") \ 881 \ 882 develop(bool, TraceICs, false, \ 883 "Trace inline cache changes") \ 884 \ 885 notproduct(bool, TraceInvocationCounterOverflow, false, \ 886 "Trace method invocation counter overflow") \ 887 \ 888 develop(bool, TraceInlineCacheClearing, false, \ 889 "Trace clearing of inline caches in nmethods") \ 890 \ 891 develop(bool, TraceDependencies, false, \ 892 "Trace dependencies") \ 893 \ 894 develop(bool, VerifyDependencies, trueInDebug, \ 895 "Exercise and verify the compilation dependency mechanism") \ 896 \ 897 develop(bool, TraceNewOopMapGeneration, false, \ 898 "Trace OopMapGeneration") \ 899 \ 900 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 901 "Trace OopMapGeneration: print detailed cell states") \ 902 \ 903 develop(bool, TimeOopMap, false, \ 904 "Time calls to GenerateOopMap::compute_map() in sum") \ 905 \ 906 develop(bool, TimeOopMap2, false, \ 907 "Time calls to GenerateOopMap::compute_map() individually") \ 908 \ 909 develop(bool, TraceOopMapRewrites, false, \ 910 "Trace rewriting of method oops during oop map generation") \ 911 \ 912 develop(bool, TraceICBuffer, false, \ 913 "Trace usage of IC buffer") \ 914 \ 915 develop(bool, TraceCompiledIC, false, \ 916 "Trace changes of compiled IC") \ 917 \ 918 develop(bool, FLSVerifyDictionary, false, \ 919 "Do lots of (expensive) FLS dictionary verification") \ 920 \ 921 \ 922 notproduct(bool, CheckMemoryInitialization, false, \ 923 "Check memory initialization") \ 924 \ 925 product(uintx, ProcessDistributionStride, 4, \ 926 "Stride through processors when distributing processes") \ 927 range(0, max_juint) \ 928 \ 929 develop(bool, TraceFinalizerRegistration, false, \ 930 "Trace registration of final references") \ 931 \ 932 product(bool, IgnoreEmptyClassPaths, false, \ 933 "Ignore empty path elements in -classpath") \ 934 \ 935 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 936 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 937 "Initial size of the boot class loader data metaspace") \ 938 range(30*K, max_uintx/BytesPerWord) \ 939 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 940 \ 941 product(bool, PrintHeapAtSIGBREAK, true, \ 942 "Print heap layout in response to SIGBREAK") \ 943 \ 944 manageable(bool, PrintClassHistogram, false, \ 945 "Print a histogram of class instances") \ 946 \ 947 experimental(double, ObjectCountCutOffPercent, 0.5, \ 948 "The percentage of the used heap that the instances of a class " \ 949 "must occupy for the class to generate a trace event") \ 950 range(0.0, 100.0) \ 951 \ 952 /* JVMTI heap profiling */ \ 953 \ 954 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 955 "Trace JVMTI object tagging calls") \ 956 \ 957 diagnostic(bool, VerifyBeforeIteration, false, \ 958 "Verify memory system before JVMTI iteration") \ 959 \ 960 /* compiler interface */ \ 961 \ 962 develop(bool, CIPrintCompilerName, false, \ 963 "when CIPrint is active, print the name of the active compiler") \ 964 \ 965 diagnostic(bool, CIPrintCompileQueue, false, \ 966 "display the contents of the compile queue whenever a " \ 967 "compilation is enqueued") \ 968 \ 969 develop(bool, CIPrintRequests, false, \ 970 "display every request for compilation") \ 971 \ 972 product(bool, CITime, false, \ 973 "collect timing information for compilation") \ 974 \ 975 develop(bool, CITimeVerbose, false, \ 976 "be more verbose in compilation timings") \ 977 \ 978 develop(bool, CITimeEach, false, \ 979 "display timing information after each successful compilation") \ 980 \ 981 develop(bool, CICountOSR, false, \ 982 "use a separate counter when assigning ids to osr compilations") \ 983 \ 984 develop(bool, CICompileNatives, true, \ 985 "compile native methods if supported by the compiler") \ 986 \ 987 develop_pd(bool, CICompileOSR, \ 988 "compile on stack replacement methods if supported by the " \ 989 "compiler") \ 990 \ 991 develop(bool, CIPrintMethodCodes, false, \ 992 "print method bytecodes of the compiled code") \ 993 \ 994 develop(bool, CIPrintTypeFlow, false, \ 995 "print the results of ciTypeFlow analysis") \ 996 \ 997 develop(bool, CITraceTypeFlow, false, \ 998 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 999 \ 1000 develop(intx, OSROnlyBCI, -1, \ 1001 "OSR only at this bci. Negative values mean exclude that bci") \ 1002 \ 1003 /* compiler */ \ 1004 \ 1005 /* notice: the max range value here is max_jint, not max_intx */ \ 1006 /* because of overflow issue */ \ 1007 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1008 "Number of compiler threads to run") \ 1009 range(0, max_jint) \ 1010 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 1011 \ 1012 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1013 "Dynamically choose the number of parallel compiler threads") \ 1014 \ 1015 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1016 "Reduce the number of parallel compiler threads when they " \ 1017 "are not used") \ 1018 \ 1019 diagnostic(bool, TraceCompilerThreads, false, \ 1020 "Trace creation and removal of compiler threads") \ 1021 \ 1022 develop(bool, InjectCompilerCreationFailure, false, \ 1023 "Inject thread creation failures for " \ 1024 "UseDynamicNumberOfCompilerThreads") \ 1025 \ 1026 product(intx, CompilationPolicyChoice, 0, \ 1027 "which compilation policy (0-2)") \ 1028 range(0, 2) \ 1029 \ 1030 develop(bool, UseStackBanging, true, \ 1031 "use stack banging for stack overflow checks (required for " \ 1032 "proper StackOverflow handling; disable only to measure cost " \ 1033 "of stackbanging)") \ 1034 \ 1035 develop(bool, UseStrictFP, true, \ 1036 "use strict fp if modifier strictfp is set") \ 1037 \ 1038 develop(bool, GenerateSynchronizationCode, true, \ 1039 "generate locking/unlocking code for synchronized methods and " \ 1040 "monitors") \ 1041 \ 1042 develop(bool, GenerateRangeChecks, true, \ 1043 "Generate range checks for array accesses") \ 1044 \ 1045 diagnostic_pd(bool, ImplicitNullChecks, \ 1046 "Generate code for implicit null checks") \ 1047 \ 1048 product_pd(bool, TrapBasedNullChecks, \ 1049 "Generate code for null checks that uses a cmp and trap " \ 1050 "instruction raising SIGTRAP. This is only used if an access to" \ 1051 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1052 "ImplicitNullChecks don't work (PPC64).") \ 1053 \ 1054 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1055 "Enable Thread SMR extra validity checks") \ 1056 \ 1057 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1058 "Enable Thread SMR Statistics") \ 1059 \ 1060 product(bool, Inline, true, \ 1061 "Enable inlining") \ 1062 \ 1063 product(bool, ClipInlining, true, \ 1064 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1065 \ 1066 develop(bool, UseCHA, true, \ 1067 "Enable CHA") \ 1068 \ 1069 product(bool, UseTypeProfile, true, \ 1070 "Check interpreter profile for historically monomorphic calls") \ 1071 \ 1072 diagnostic(bool, PrintInlining, false, \ 1073 "Print inlining optimizations") \ 1074 \ 1075 product(bool, UsePopCountInstruction, false, \ 1076 "Use population count instruction") \ 1077 \ 1078 develop(bool, EagerInitialization, false, \ 1079 "Eagerly initialize classes if possible") \ 1080 \ 1081 diagnostic(bool, LogTouchedMethods, false, \ 1082 "Log methods which have been ever touched in runtime") \ 1083 \ 1084 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1085 "Print all methods that have been ever touched in runtime") \ 1086 \ 1087 develop(bool, TraceMethodReplacement, false, \ 1088 "Print when methods are replaced do to recompilation") \ 1089 \ 1090 develop(bool, PrintMethodFlushing, false, \ 1091 "Print the nmethods being flushed") \ 1092 \ 1093 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1094 "print statistics about method flushing") \ 1095 \ 1096 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1097 "Number of compiled code invocations after which " \ 1098 "the method is considered as hot by the flusher") \ 1099 range(1, max_jint) \ 1100 \ 1101 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1102 "Minimum number of sweeper passes before an nmethod " \ 1103 "can be flushed") \ 1104 range(0, max_intx) \ 1105 \ 1106 product(bool, UseCodeAging, true, \ 1107 "Insert counter to detect warm methods") \ 1108 \ 1109 diagnostic(bool, StressCodeAging, false, \ 1110 "Start with counters compiled in") \ 1111 \ 1112 develop(bool, StressCodeBuffers, false, \ 1113 "Exercise code buffer expansion and other rare state changes") \ 1114 \ 1115 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1116 "Generate extra debugging information for non-safepoints in " \ 1117 "nmethods") \ 1118 \ 1119 product(bool, PrintVMOptions, false, \ 1120 "Print flags that appeared on the command line") \ 1121 \ 1122 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1123 "Ignore unrecognized VM options") \ 1124 \ 1125 product(bool, PrintCommandLineFlags, false, \ 1126 "Print flags specified on command line or set by ergonomics") \ 1127 \ 1128 product(bool, PrintFlagsInitial, false, \ 1129 "Print all VM flags before argument processing and exit VM") \ 1130 \ 1131 product(bool, PrintFlagsFinal, false, \ 1132 "Print all VM flags after argument and ergonomic processing") \ 1133 \ 1134 notproduct(bool, PrintFlagsWithComments, false, \ 1135 "Print all VM flags with default values and descriptions and " \ 1136 "exit") \ 1137 \ 1138 product(bool, PrintFlagsRanges, false, \ 1139 "Print VM flags and their ranges") \ 1140 \ 1141 diagnostic(bool, SerializeVMOutput, true, \ 1142 "Use a mutex to serialize output to tty and LogFile") \ 1143 \ 1144 diagnostic(bool, DisplayVMOutput, true, \ 1145 "Display all VM output on the tty, independently of LogVMOutput") \ 1146 \ 1147 diagnostic(bool, LogVMOutput, false, \ 1148 "Save VM output to LogFile") \ 1149 \ 1150 diagnostic(ccstr, LogFile, NULL, \ 1151 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1152 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1153 \ 1154 product(ccstr, ErrorFile, NULL, \ 1155 "If an error occurs, save the error data to this file " \ 1156 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1157 \ 1158 product(bool, ExtensiveErrorReports, \ 1159 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1160 "Error reports are more extensive.") \ 1161 \ 1162 product(bool, DisplayVMOutputToStderr, false, \ 1163 "If DisplayVMOutput is true, display all VM output to stderr") \ 1164 \ 1165 product(bool, DisplayVMOutputToStdout, false, \ 1166 "If DisplayVMOutput is true, display all VM output to stdout") \ 1167 \ 1168 product(bool, ErrorFileToStderr, false, \ 1169 "If true, error data is printed to stderr instead of a file") \ 1170 \ 1171 product(bool, ErrorFileToStdout, false, \ 1172 "If true, error data is printed to stdout instead of a file") \ 1173 \ 1174 product(bool, UseHeavyMonitors, false, \ 1175 "use heavyweight instead of lightweight Java monitors") \ 1176 \ 1177 product(bool, PrintStringTableStatistics, false, \ 1178 "print statistics about the StringTable and SymbolTable") \ 1179 \ 1180 diagnostic(bool, VerifyStringTableAtExit, false, \ 1181 "verify StringTable contents at exit") \ 1182 \ 1183 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1184 "print histogram of the symbol table") \ 1185 \ 1186 notproduct(bool, ExitVMOnVerifyError, false, \ 1187 "standard exit from VM if bytecode verify error " \ 1188 "(only in debug mode)") \ 1189 \ 1190 diagnostic(ccstr, AbortVMOnException, NULL, \ 1191 "Call fatal if this exception is thrown. Example: " \ 1192 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1193 \ 1194 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1195 "Call fatal if the exception pointed by AbortVMOnException " \ 1196 "has this message") \ 1197 \ 1198 develop(bool, DebugVtables, false, \ 1199 "add debugging code to vtable dispatch") \ 1200 \ 1201 notproduct(bool, PrintVtableStats, false, \ 1202 "print vtables stats at end of run") \ 1203 \ 1204 develop(bool, TraceCreateZombies, false, \ 1205 "trace creation of zombie nmethods") \ 1206 \ 1207 notproduct(bool, IgnoreLockingAssertions, false, \ 1208 "disable locking assertions (for speed)") \ 1209 \ 1210 product(bool, RangeCheckElimination, true, \ 1211 "Eliminate range checks") \ 1212 \ 1213 develop_pd(bool, UncommonNullCast, \ 1214 "track occurrences of null in casts; adjust compiler tactics") \ 1215 \ 1216 develop(bool, TypeProfileCasts, true, \ 1217 "treat casts like calls for purposes of type profiling") \ 1218 \ 1219 develop(bool, TraceLivenessGen, false, \ 1220 "Trace the generation of liveness analysis information") \ 1221 \ 1222 notproduct(bool, TraceLivenessQuery, false, \ 1223 "Trace queries of liveness analysis information") \ 1224 \ 1225 notproduct(bool, CollectIndexSetStatistics, false, \ 1226 "Collect information about IndexSets") \ 1227 \ 1228 develop(bool, UseLoopSafepoints, true, \ 1229 "Generate Safepoint nodes in every loop") \ 1230 \ 1231 develop(intx, FastAllocateSizeLimit, 128*K, \ 1232 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1233 "Inline allocations larger than this in doublewords must go slow")\ 1234 \ 1235 product_pd(bool, CompactStrings, \ 1236 "Enable Strings to use single byte chars in backing store") \ 1237 \ 1238 product_pd(uintx, TypeProfileLevel, \ 1239 "=XYZ, with Z: Type profiling of arguments at call; " \ 1240 "Y: Type profiling of return value at call; " \ 1241 "X: Type profiling of parameters to methods; " \ 1242 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1243 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1244 \ 1245 product(intx, TypeProfileArgsLimit, 2, \ 1246 "max number of call arguments to consider for type profiling") \ 1247 range(0, 16) \ 1248 \ 1249 product(intx, TypeProfileParmsLimit, 2, \ 1250 "max number of incoming parameters to consider for type profiling"\ 1251 ", -1 for all") \ 1252 range(-1, 64) \ 1253 \ 1254 /* statistics */ \ 1255 develop(bool, CountCompiledCalls, false, \ 1256 "Count method invocations") \ 1257 \ 1258 notproduct(bool, CountRuntimeCalls, false, \ 1259 "Count VM runtime calls") \ 1260 \ 1261 develop(bool, CountJNICalls, false, \ 1262 "Count jni method invocations") \ 1263 \ 1264 notproduct(bool, CountJVMCalls, false, \ 1265 "Count jvm method invocations") \ 1266 \ 1267 notproduct(bool, CountRemovableExceptions, false, \ 1268 "Count exceptions that could be replaced by branches due to " \ 1269 "inlining") \ 1270 \ 1271 notproduct(bool, ICMissHistogram, false, \ 1272 "Produce histogram of IC misses") \ 1273 \ 1274 /* interpreter */ \ 1275 product_pd(bool, RewriteBytecodes, \ 1276 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1277 \ 1278 product_pd(bool, RewriteFrequentPairs, \ 1279 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1280 \ 1281 diagnostic(bool, PrintInterpreter, false, \ 1282 "Print the generated interpreter code") \ 1283 \ 1284 product(bool, UseInterpreter, true, \ 1285 "Use interpreter for non-compiled methods") \ 1286 \ 1287 develop(bool, UseFastSignatureHandlers, true, \ 1288 "Use fast signature handlers for native calls") \ 1289 \ 1290 product(bool, UseLoopCounter, true, \ 1291 "Increment invocation counter on backward branch") \ 1292 \ 1293 product_pd(bool, UseOnStackReplacement, \ 1294 "Use on stack replacement, calls runtime if invoc. counter " \ 1295 "overflows in loop") \ 1296 \ 1297 notproduct(bool, TraceOnStackReplacement, false, \ 1298 "Trace on stack replacement") \ 1299 \ 1300 product_pd(bool, PreferInterpreterNativeStubs, \ 1301 "Use always interpreter stubs for native methods invoked via " \ 1302 "interpreter") \ 1303 \ 1304 develop(bool, CountBytecodes, false, \ 1305 "Count number of bytecodes executed") \ 1306 \ 1307 develop(bool, PrintBytecodeHistogram, false, \ 1308 "Print histogram of the executed bytecodes") \ 1309 \ 1310 develop(bool, PrintBytecodePairHistogram, false, \ 1311 "Print histogram of the executed bytecode pairs") \ 1312 \ 1313 diagnostic(bool, PrintSignatureHandlers, false, \ 1314 "Print code generated for native method signature handlers") \ 1315 \ 1316 develop(bool, VerifyOops, false, \ 1317 "Do plausibility checks for oops") \ 1318 \ 1319 develop(bool, CheckUnhandledOops, false, \ 1320 "Check for unhandled oops in VM code") \ 1321 \ 1322 develop(bool, VerifyJNIFields, trueInDebug, \ 1323 "Verify jfieldIDs for instance fields") \ 1324 \ 1325 notproduct(bool, VerifyJNIEnvThread, false, \ 1326 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1327 "from JNI") \ 1328 \ 1329 develop(bool, VerifyFPU, false, \ 1330 "Verify FPU state (check for NaN's, etc.)") \ 1331 \ 1332 develop(bool, VerifyThread, false, \ 1333 "Watch the thread register for corruption (SPARC only)") \ 1334 \ 1335 develop(bool, VerifyActivationFrameSize, false, \ 1336 "Verify that activation frame didn't become smaller than its " \ 1337 "minimal size") \ 1338 \ 1339 develop(bool, TraceFrequencyInlining, false, \ 1340 "Trace frequency based inlining") \ 1341 \ 1342 develop_pd(bool, InlineIntrinsics, \ 1343 "Inline intrinsics that can be statically resolved") \ 1344 \ 1345 product_pd(bool, ProfileInterpreter, \ 1346 "Profile at the bytecode level during interpretation") \ 1347 \ 1348 develop(bool, TraceProfileInterpreter, false, \ 1349 "Trace profiling at the bytecode level during interpretation. " \ 1350 "This outputs the profiling information collected to improve " \ 1351 "jit compilation.") \ 1352 \ 1353 develop_pd(bool, ProfileTraps, \ 1354 "Profile deoptimization traps at the bytecode level") \ 1355 \ 1356 product(intx, ProfileMaturityPercentage, 20, \ 1357 "number of method invocations/branches (expressed as % of " \ 1358 "CompileThreshold) before using the method's profile") \ 1359 range(0, 100) \ 1360 \ 1361 diagnostic(bool, PrintMethodData, false, \ 1362 "Print the results of +ProfileInterpreter at end of run") \ 1363 \ 1364 develop(bool, VerifyDataPointer, trueInDebug, \ 1365 "Verify the method data pointer during interpreter profiling") \ 1366 \ 1367 develop(bool, VerifyCompiledCode, false, \ 1368 "Include miscellaneous runtime verifications in nmethod code; " \ 1369 "default off because it disturbs nmethod size heuristics") \ 1370 \ 1371 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1372 "Manually make GC thread crash then dump java stack trace; " \ 1373 "Test only") \ 1374 \ 1375 /* compilation */ \ 1376 product(bool, UseCompiler, true, \ 1377 "Use Just-In-Time compilation") \ 1378 \ 1379 product(bool, UseCounterDecay, true, \ 1380 "Adjust recompilation counters") \ 1381 \ 1382 develop(intx, CounterHalfLifeTime, 30, \ 1383 "Half-life time of invocation counters (in seconds)") \ 1384 \ 1385 develop(intx, CounterDecayMinIntervalLength, 500, \ 1386 "The minimum interval (in milliseconds) between invocation of " \ 1387 "CounterDecay") \ 1388 \ 1389 product(bool, AlwaysCompileLoopMethods, false, \ 1390 "When using recompilation, never interpret methods " \ 1391 "containing loops") \ 1392 \ 1393 product(bool, DontCompileHugeMethods, true, \ 1394 "Do not compile methods > HugeMethodLimit") \ 1395 \ 1396 /* Bytecode escape analysis estimation. */ \ 1397 product(bool, EstimateArgEscape, true, \ 1398 "Analyze bytecodes to estimate escape state of arguments") \ 1399 \ 1400 product(intx, BCEATraceLevel, 0, \ 1401 "How much tracing to do of bytecode escape analysis estimates " \ 1402 "(0-3)") \ 1403 range(0, 3) \ 1404 \ 1405 product(intx, MaxBCEAEstimateLevel, 5, \ 1406 "Maximum number of nested calls that are analyzed by BC EA") \ 1407 range(0, max_jint) \ 1408 \ 1409 product(intx, MaxBCEAEstimateSize, 150, \ 1410 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1411 range(0, max_jint) \ 1412 \ 1413 product(intx, AllocatePrefetchStyle, 1, \ 1414 "0 = no prefetch, " \ 1415 "1 = generate prefetch instructions for each allocation, " \ 1416 "2 = use TLAB watermark to gate allocation prefetch, " \ 1417 "3 = generate one prefetch instruction per cache line") \ 1418 range(0, 3) \ 1419 \ 1420 product(intx, AllocatePrefetchDistance, -1, \ 1421 "Distance to prefetch ahead of allocation pointer. " \ 1422 "-1: use system-specific value (automatically determined") \ 1423 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 1424 \ 1425 product(intx, AllocatePrefetchLines, 3, \ 1426 "Number of lines to prefetch ahead of array allocation pointer") \ 1427 range(1, 64) \ 1428 \ 1429 product(intx, AllocateInstancePrefetchLines, 1, \ 1430 "Number of lines to prefetch ahead of instance allocation " \ 1431 "pointer") \ 1432 range(1, 64) \ 1433 \ 1434 product(intx, AllocatePrefetchStepSize, 16, \ 1435 "Step size in bytes of sequential prefetch instructions") \ 1436 range(1, 512) \ 1437 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1438 \ 1439 product(intx, AllocatePrefetchInstr, 0, \ 1440 "Select instruction to prefetch ahead of allocation pointer") \ 1441 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1442 \ 1443 /* deoptimization */ \ 1444 develop(bool, TraceDeoptimization, false, \ 1445 "Trace deoptimization") \ 1446 \ 1447 develop(bool, PrintDeoptimizationDetails, false, \ 1448 "Print more information about deoptimization") \ 1449 \ 1450 develop(bool, DebugDeoptimization, false, \ 1451 "Tracing various information while debugging deoptimization") \ 1452 \ 1453 product(intx, SelfDestructTimer, 0, \ 1454 "Will cause VM to terminate after a given time (in minutes) " \ 1455 "(0 means off)") \ 1456 range(0, max_intx) \ 1457 \ 1458 product(intx, MaxJavaStackTraceDepth, 1024, \ 1459 "The maximum number of lines in the stack trace for Java " \ 1460 "exceptions (0 means all)") \ 1461 range(0, max_jint/2) \ 1462 \ 1463 /* notice: the max range value here is max_jint, not max_intx */ \ 1464 /* because of overflow issue */ \ 1465 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1466 "Guarantee a safepoint (at least) every so many milliseconds " \ 1467 "(0 means none)") \ 1468 range(0, max_jint) \ 1469 \ 1470 product(intx, SafepointTimeoutDelay, 10000, \ 1471 "Delay in milliseconds for option SafepointTimeout") \ 1472 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1473 NOT_LP64(range(0, max_intx)) \ 1474 \ 1475 product(intx, NmethodSweepActivity, 10, \ 1476 "Removes cold nmethods from code cache if > 0. Higher values " \ 1477 "result in more aggressive sweeping") \ 1478 range(0, 2000) \ 1479 \ 1480 notproduct(bool, LogSweeper, false, \ 1481 "Keep a ring buffer of sweeper activity") \ 1482 \ 1483 notproduct(intx, SweeperLogEntries, 1024, \ 1484 "Number of records in the ring buffer of sweeper activity") \ 1485 \ 1486 notproduct(intx, MemProfilingInterval, 500, \ 1487 "Time between each invocation of the MemProfiler") \ 1488 \ 1489 develop(intx, MallocCatchPtr, -1, \ 1490 "Hit breakpoint when mallocing/freeing this pointer") \ 1491 \ 1492 notproduct(ccstrlist, SuppressErrorAt, "", \ 1493 "List of assertions (file:line) to muzzle") \ 1494 \ 1495 develop(intx, StackPrintLimit, 100, \ 1496 "number of stack frames to print in VM-level stack dump") \ 1497 \ 1498 notproduct(intx, MaxElementPrintSize, 256, \ 1499 "maximum number of elements to print") \ 1500 \ 1501 notproduct(intx, MaxSubklassPrintSize, 4, \ 1502 "maximum number of subklasses to print when printing klass") \ 1503 \ 1504 product(intx, MaxInlineLevel, 9, \ 1505 "maximum number of nested calls that are inlined") \ 1506 range(0, max_jint) \ 1507 \ 1508 product(intx, MaxRecursiveInlineLevel, 1, \ 1509 "maximum number of nested recursive calls that are inlined") \ 1510 range(0, max_jint) \ 1511 \ 1512 develop(intx, MaxForceInlineLevel, 100, \ 1513 "maximum number of nested calls that are forced for inlining " \ 1514 "(using CompileCommand or marked w/ @ForceInline)") \ 1515 range(0, max_jint) \ 1516 \ 1517 product_pd(intx, InlineSmallCode, \ 1518 "Only inline already compiled methods if their code size is " \ 1519 "less than this") \ 1520 range(0, max_jint) \ 1521 \ 1522 product(intx, MaxInlineSize, 35, \ 1523 "The maximum bytecode size of a method to be inlined") \ 1524 range(0, max_jint) \ 1525 \ 1526 product_pd(intx, FreqInlineSize, \ 1527 "The maximum bytecode size of a frequent method to be inlined") \ 1528 range(0, max_jint) \ 1529 \ 1530 product(intx, MaxTrivialSize, 6, \ 1531 "The maximum bytecode size of a trivial method to be inlined") \ 1532 range(0, max_jint) \ 1533 \ 1534 product(intx, MinInliningThreshold, 250, \ 1535 "The minimum invocation count a method needs to have to be " \ 1536 "inlined") \ 1537 range(0, max_jint) \ 1538 \ 1539 develop(intx, MethodHistogramCutoff, 100, \ 1540 "The cutoff value for method invocation histogram (+CountCalls)") \ 1541 \ 1542 develop(intx, DontYieldALotInterval, 10, \ 1543 "Interval between which yields will be dropped (milliseconds)") \ 1544 \ 1545 notproduct(intx, DeoptimizeALotInterval, 5, \ 1546 "Number of exits until DeoptimizeALot kicks in") \ 1547 \ 1548 notproduct(intx, ZombieALotInterval, 5, \ 1549 "Number of exits until ZombieALot kicks in") \ 1550 \ 1551 diagnostic(uintx, MallocMaxTestWords, 0, \ 1552 "If non-zero, maximum number of words that malloc/realloc can " \ 1553 "allocate (for testing only)") \ 1554 range(0, max_uintx) \ 1555 \ 1556 product(intx, TypeProfileWidth, 2, \ 1557 "Number of receiver types to record in call/cast profile") \ 1558 range(0, 8) \ 1559 \ 1560 develop(intx, BciProfileWidth, 2, \ 1561 "Number of return bci's to record in ret profile") \ 1562 \ 1563 product(intx, PerMethodRecompilationCutoff, 400, \ 1564 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1565 range(-1, max_intx) \ 1566 \ 1567 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1568 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1569 range(-1, max_intx) \ 1570 \ 1571 product(intx, PerMethodTrapLimit, 100, \ 1572 "Limit on traps (of one kind) in a method (includes inlines)") \ 1573 range(0, max_jint) \ 1574 \ 1575 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1576 "Limit on speculative traps (of one kind) in a method " \ 1577 "(includes inlines)") \ 1578 range(0, max_jint) \ 1579 \ 1580 product(intx, PerBytecodeTrapLimit, 4, \ 1581 "Limit on traps (of one kind) at a particular BCI") \ 1582 range(0, max_jint) \ 1583 \ 1584 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1585 "Extra method data trap entries for speculation") \ 1586 \ 1587 develop(intx, InlineFrequencyRatio, 20, \ 1588 "Ratio of call site execution to caller method invocation") \ 1589 range(0, max_jint) \ 1590 \ 1591 diagnostic_pd(intx, InlineFrequencyCount, \ 1592 "Count of call site execution necessary to trigger frequent " \ 1593 "inlining") \ 1594 range(0, max_jint) \ 1595 \ 1596 develop(intx, InlineThrowCount, 50, \ 1597 "Force inlining of interpreted methods that throw this often") \ 1598 range(0, max_jint) \ 1599 \ 1600 develop(intx, InlineThrowMaxSize, 200, \ 1601 "Force inlining of throwing methods smaller than this") \ 1602 range(0, max_jint) \ 1603 \ 1604 develop(intx, ProfilerNodeSize, 1024, \ 1605 "Size in K to allocate for the Profile Nodes of each thread") \ 1606 range(0, 1024) \ 1607 \ 1608 product_pd(size_t, MetaspaceSize, \ 1609 "Initial threshold (in bytes) at which a garbage collection " \ 1610 "is done to reduce Metaspace usage") \ 1611 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1612 \ 1613 product(size_t, MaxMetaspaceSize, max_uintx, \ 1614 "Maximum size of Metaspaces (in bytes)") \ 1615 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1616 \ 1617 product(size_t, CompressedClassSpaceSize, 1*G, \ 1618 "Maximum size of class area in Metaspace when compressed " \ 1619 "class pointers are used") \ 1620 range(1*M, 3*G) \ 1621 \ 1622 manageable(uintx, MinHeapFreeRatio, 40, \ 1623 "The minimum percentage of heap free after GC to avoid expansion."\ 1624 " For most GCs this applies to the old generation. In G1 and" \ 1625 " ParallelGC it applies to the whole heap.") \ 1626 range(0, 100) \ 1627 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1628 \ 1629 manageable(uintx, MaxHeapFreeRatio, 70, \ 1630 "The maximum percentage of heap free after GC to avoid shrinking."\ 1631 " For most GCs this applies to the old generation. In G1 and" \ 1632 " ParallelGC it applies to the whole heap.") \ 1633 range(0, 100) \ 1634 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1635 \ 1636 product(bool, ShrinkHeapInSteps, true, \ 1637 "When disabled, informs the GC to shrink the java heap directly" \ 1638 " to the target size at the next full GC rather than requiring" \ 1639 " smaller steps during multiple full GCs.") \ 1640 \ 1641 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1642 "Number of milliseconds per MB of free space in the heap") \ 1643 range(0, max_intx) \ 1644 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1645 \ 1646 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1647 "The minimum change in heap space due to GC (in bytes)") \ 1648 range(0, max_uintx) \ 1649 \ 1650 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1651 "The minimum expansion of Metaspace (in bytes)") \ 1652 range(0, max_uintx) \ 1653 \ 1654 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1655 "The maximum percentage of Metaspace free after GC to avoid " \ 1656 "shrinking") \ 1657 range(0, 100) \ 1658 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1659 \ 1660 product(uintx, MinMetaspaceFreeRatio, 40, \ 1661 "The minimum percentage of Metaspace free after GC to avoid " \ 1662 "expansion") \ 1663 range(0, 99) \ 1664 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1665 \ 1666 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1667 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1668 range(0, max_uintx) \ 1669 \ 1670 /* stack parameters */ \ 1671 product_pd(intx, StackYellowPages, \ 1672 "Number of yellow zone (recoverable overflows) pages of size " \ 1673 "4KB. If pages are bigger yellow zone is aligned up.") \ 1674 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1675 \ 1676 product_pd(intx, StackRedPages, \ 1677 "Number of red zone (unrecoverable overflows) pages of size " \ 1678 "4KB. If pages are bigger red zone is aligned up.") \ 1679 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1680 \ 1681 product_pd(intx, StackReservedPages, \ 1682 "Number of reserved zone (reserved to annotated methods) pages" \ 1683 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1684 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1685 \ 1686 product(bool, RestrictReservedStack, true, \ 1687 "Restrict @ReservedStackAccess to trusted classes") \ 1688 \ 1689 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1690 product_pd(intx, StackShadowPages, \ 1691 "Number of shadow zone (for overflow checking) pages of size " \ 1692 "4KB. If pages are bigger shadow zone is aligned up. " \ 1693 "This should exceed the depth of the VM and native call stack.") \ 1694 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1695 \ 1696 product_pd(intx, ThreadStackSize, \ 1697 "Thread Stack Size (in Kbytes)") \ 1698 range(0, 1 * M) \ 1699 \ 1700 product_pd(intx, VMThreadStackSize, \ 1701 "Non-Java Thread Stack Size (in Kbytes)") \ 1702 range(0, max_intx/(1 * K)) \ 1703 \ 1704 product_pd(intx, CompilerThreadStackSize, \ 1705 "Compiler Thread Stack Size (in Kbytes)") \ 1706 range(0, max_intx/(1 * K)) \ 1707 \ 1708 develop_pd(size_t, JVMInvokeMethodSlack, \ 1709 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1710 \ 1711 /* code cache parameters */ \ 1712 develop_pd(uintx, CodeCacheSegmentSize, \ 1713 "Code cache segment size (in bytes) - smallest unit of " \ 1714 "allocation") \ 1715 range(1, 1024) \ 1716 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1717 \ 1718 develop_pd(intx, CodeEntryAlignment, \ 1719 "Code entry alignment for generated code (in bytes)") \ 1720 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1721 \ 1722 product_pd(intx, OptoLoopAlignment, \ 1723 "Align inner loops to zero relative to this modulus") \ 1724 range(1, 16) \ 1725 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1726 \ 1727 product_pd(uintx, InitialCodeCacheSize, \ 1728 "Initial code cache size (in bytes)") \ 1729 range(os::vm_page_size(), max_uintx) \ 1730 \ 1731 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1732 "Minimum code cache size (in bytes) required to start VM.") \ 1733 range(0, max_uintx) \ 1734 \ 1735 product(bool, SegmentedCodeCache, false, \ 1736 "Use a segmented code cache") \ 1737 \ 1738 product_pd(uintx, ReservedCodeCacheSize, \ 1739 "Reserved code cache size (in bytes) - maximum code cache size") \ 1740 range(os::vm_page_size(), max_uintx) \ 1741 \ 1742 product_pd(uintx, NonProfiledCodeHeapSize, \ 1743 "Size of code heap with non-profiled methods (in bytes)") \ 1744 range(0, max_uintx) \ 1745 \ 1746 product_pd(uintx, ProfiledCodeHeapSize, \ 1747 "Size of code heap with profiled methods (in bytes)") \ 1748 range(0, max_uintx) \ 1749 \ 1750 product_pd(uintx, NonNMethodCodeHeapSize, \ 1751 "Size of code heap with non-nmethods (in bytes)") \ 1752 range(os::vm_page_size(), max_uintx) \ 1753 \ 1754 product_pd(uintx, CodeCacheExpansionSize, \ 1755 "Code cache expansion size (in bytes)") \ 1756 range(32*K, max_uintx) \ 1757 \ 1758 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1759 "Minimum number of segments in a code cache block") \ 1760 range(1, 100) \ 1761 \ 1762 notproduct(bool, ExitOnFullCodeCache, false, \ 1763 "Exit the VM if we fill the code cache") \ 1764 \ 1765 product(bool, UseCodeCacheFlushing, true, \ 1766 "Remove cold/old nmethods from the code cache") \ 1767 \ 1768 product(uintx, StartAggressiveSweepingAt, 10, \ 1769 "Start aggressive sweeping if X[%] of the code cache is free." \ 1770 "Segmented code cache: X[%] of the non-profiled heap." \ 1771 "Non-segmented code cache: X[%] of the total code cache") \ 1772 range(0, 100) \ 1773 \ 1774 /* AOT parameters */ \ 1775 product(bool, UseAOT, AOT_ONLY(true) NOT_AOT(false), \ 1776 "Use AOT compiled files") \ 1777 \ 1778 product(ccstrlist, AOTLibrary, NULL, \ 1779 "AOT library") \ 1780 \ 1781 product(bool, PrintAOT, false, \ 1782 "Print used AOT klasses and methods") \ 1783 \ 1784 notproduct(bool, PrintAOTStatistics, false, \ 1785 "Print AOT statistics") \ 1786 \ 1787 diagnostic(bool, UseAOTStrictLoading, false, \ 1788 "Exit the VM if any of the AOT libraries has invalid config") \ 1789 \ 1790 product(bool, CalculateClassFingerprint, false, \ 1791 "Calculate class fingerprint") \ 1792 \ 1793 /* interpreter debugging */ \ 1794 develop(intx, BinarySwitchThreshold, 5, \ 1795 "Minimal number of lookupswitch entries for rewriting to binary " \ 1796 "switch") \ 1797 \ 1798 develop(intx, StopInterpreterAt, 0, \ 1799 "Stop interpreter execution at specified bytecode number") \ 1800 \ 1801 develop(intx, TraceBytecodesAt, 0, \ 1802 "Trace bytecodes starting with specified bytecode number") \ 1803 \ 1804 /* compiler interface */ \ 1805 develop(intx, CIStart, 0, \ 1806 "The id of the first compilation to permit") \ 1807 \ 1808 develop(intx, CIStop, max_jint, \ 1809 "The id of the last compilation to permit") \ 1810 \ 1811 develop(intx, CIStartOSR, 0, \ 1812 "The id of the first osr compilation to permit " \ 1813 "(CICountOSR must be on)") \ 1814 \ 1815 develop(intx, CIStopOSR, max_jint, \ 1816 "The id of the last osr compilation to permit " \ 1817 "(CICountOSR must be on)") \ 1818 \ 1819 develop(intx, CIBreakAtOSR, -1, \ 1820 "The id of osr compilation to break at") \ 1821 \ 1822 develop(intx, CIBreakAt, -1, \ 1823 "The id of compilation to break at") \ 1824 \ 1825 product(ccstrlist, CompileOnly, "", \ 1826 "List of methods (pkg/class.name) to restrict compilation to") \ 1827 \ 1828 product(ccstr, CompileCommandFile, NULL, \ 1829 "Read compiler commands from this file [.hotspot_compiler]") \ 1830 \ 1831 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1832 "Read compiler directives from this file") \ 1833 \ 1834 product(ccstrlist, CompileCommand, "", \ 1835 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1836 \ 1837 develop(bool, ReplayCompiles, false, \ 1838 "Enable replay of compilations from ReplayDataFile") \ 1839 \ 1840 product(ccstr, ReplayDataFile, NULL, \ 1841 "File containing compilation replay information" \ 1842 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1843 \ 1844 product(ccstr, InlineDataFile, NULL, \ 1845 "File containing inlining replay information" \ 1846 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1847 \ 1848 develop(intx, ReplaySuppressInitializers, 2, \ 1849 "Control handling of class initialization during replay: " \ 1850 "0 - don't do anything special; " \ 1851 "1 - treat all class initializers as empty; " \ 1852 "2 - treat class initializers for application classes as empty; " \ 1853 "3 - allow all class initializers to run during bootstrap but " \ 1854 " pretend they are empty after starting replay") \ 1855 range(0, 3) \ 1856 \ 1857 develop(bool, ReplayIgnoreInitErrors, false, \ 1858 "Ignore exceptions thrown during initialization for replay") \ 1859 \ 1860 product(bool, DumpReplayDataOnError, true, \ 1861 "Record replay data for crashing compiler threads") \ 1862 \ 1863 product(bool, CICompilerCountPerCPU, false, \ 1864 "1 compiler thread for log(N CPUs)") \ 1865 \ 1866 notproduct(intx, CICrashAt, -1, \ 1867 "id of compilation to trigger assert in compiler thread for " \ 1868 "the purpose of testing, e.g. generation of replay data") \ 1869 notproduct(bool, CIObjectFactoryVerify, false, \ 1870 "enable potentially expensive verification in ciObjectFactory") \ 1871 \ 1872 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1873 "Abort VM when method had failed to compile.") \ 1874 \ 1875 /* Priorities */ \ 1876 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1877 \ 1878 product(intx, ThreadPriorityPolicy, 0, \ 1879 "0 : Normal. "\ 1880 " VM chooses priorities that are appropriate for normal "\ 1881 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1882 " to normal native priority. Java priorities below " \ 1883 " NORM_PRIORITY map to lower native priority values. On "\ 1884 " Windows applications are allowed to use higher native "\ 1885 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1886 " not use the highest possible native priority, "\ 1887 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1888 " system threads. On Linux thread priorities are ignored "\ 1889 " because the OS does not support static priority in "\ 1890 " SCHED_OTHER scheduling class which is the only choice for "\ 1891 " non-root, non-realtime applications. "\ 1892 "1 : Aggressive. "\ 1893 " Java thread priorities map over to the entire range of "\ 1894 " native thread priorities. Higher Java thread priorities map "\ 1895 " to higher native thread priorities. This policy should be "\ 1896 " used with care, as sometimes it can cause performance "\ 1897 " degradation in the application and/or the entire system. On "\ 1898 " Linux/BSD/macOS this policy requires root privilege or an "\ 1899 " extended capability.") \ 1900 range(0, 1) \ 1901 \ 1902 product(bool, ThreadPriorityVerbose, false, \ 1903 "Print priority changes") \ 1904 \ 1905 product(intx, CompilerThreadPriority, -1, \ 1906 "The native priority at which compiler threads should run " \ 1907 "(-1 means no change)") \ 1908 range(min_jint, max_jint) \ 1909 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1910 \ 1911 product(intx, VMThreadPriority, -1, \ 1912 "The native priority at which the VM thread should run " \ 1913 "(-1 means no change)") \ 1914 range(-1, 127) \ 1915 \ 1916 product(intx, JavaPriority1_To_OSPriority, -1, \ 1917 "Map Java priorities to OS priorities") \ 1918 range(-1, 127) \ 1919 \ 1920 product(intx, JavaPriority2_To_OSPriority, -1, \ 1921 "Map Java priorities to OS priorities") \ 1922 range(-1, 127) \ 1923 \ 1924 product(intx, JavaPriority3_To_OSPriority, -1, \ 1925 "Map Java priorities to OS priorities") \ 1926 range(-1, 127) \ 1927 \ 1928 product(intx, JavaPriority4_To_OSPriority, -1, \ 1929 "Map Java priorities to OS priorities") \ 1930 range(-1, 127) \ 1931 \ 1932 product(intx, JavaPriority5_To_OSPriority, -1, \ 1933 "Map Java priorities to OS priorities") \ 1934 range(-1, 127) \ 1935 \ 1936 product(intx, JavaPriority6_To_OSPriority, -1, \ 1937 "Map Java priorities to OS priorities") \ 1938 range(-1, 127) \ 1939 \ 1940 product(intx, JavaPriority7_To_OSPriority, -1, \ 1941 "Map Java priorities to OS priorities") \ 1942 range(-1, 127) \ 1943 \ 1944 product(intx, JavaPriority8_To_OSPriority, -1, \ 1945 "Map Java priorities to OS priorities") \ 1946 range(-1, 127) \ 1947 \ 1948 product(intx, JavaPriority9_To_OSPriority, -1, \ 1949 "Map Java priorities to OS priorities") \ 1950 range(-1, 127) \ 1951 \ 1952 product(intx, JavaPriority10_To_OSPriority,-1, \ 1953 "Map Java priorities to OS priorities") \ 1954 range(-1, 127) \ 1955 \ 1956 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1957 "Java thread priority 10 maps to critical scheduling priority") \ 1958 \ 1959 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1960 "Compiler thread(s) run at critical scheduling priority") \ 1961 \ 1962 experimental(bool, UseCriticalCMSThreadPriority, false, \ 1963 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 1964 \ 1965 develop(intx, NewCodeParameter, 0, \ 1966 "Testing Only: Create a dedicated integer parameter before " \ 1967 "putback") \ 1968 \ 1969 /* new oopmap storage allocation */ \ 1970 develop(intx, MinOopMapAllocation, 8, \ 1971 "Minimum number of OopMap entries in an OopMapSet") \ 1972 \ 1973 /* Background Compilation */ \ 1974 develop(intx, LongCompileThreshold, 50, \ 1975 "Used with +TraceLongCompiles") \ 1976 \ 1977 /* recompilation */ \ 1978 product_pd(intx, CompileThreshold, \ 1979 "number of interpreted method invocations before (re-)compiling") \ 1980 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1981 \ 1982 product(double, CompileThresholdScaling, 1.0, \ 1983 "Factor to control when first compilation happens " \ 1984 "(both with and without tiered compilation): " \ 1985 "values greater than 1.0 delay counter overflow, " \ 1986 "values between 0 and 1.0 rush counter overflow, " \ 1987 "value of 1.0 leaves compilation thresholds unchanged " \ 1988 "value of 0.0 is equivalent to -Xint. " \ 1989 "" \ 1990 "Flag can be set as per-method option. " \ 1991 "If a value is specified for a method, compilation thresholds " \ 1992 "for that method are scaled by both the value of the global flag "\ 1993 "and the value of the per-method flag.") \ 1994 range(0.0, DBL_MAX) \ 1995 \ 1996 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 1997 "Interpreter (tier 0) invocation notification frequency") \ 1998 range(0, 30) \ 1999 \ 2000 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 2001 "C1 without MDO (tier 2) invocation notification frequency") \ 2002 range(0, 30) \ 2003 \ 2004 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 2005 "C1 with MDO profiling (tier 3) invocation notification " \ 2006 "frequency") \ 2007 range(0, 30) \ 2008 \ 2009 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 2010 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 2011 range(0, 30) \ 2012 \ 2013 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 2014 "Interpreter (tier 0) invocation notification frequency") \ 2015 range(0, 30) \ 2016 \ 2017 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 2018 "C1 without MDO (tier 2) invocation notification frequency") \ 2019 range(0, 30) \ 2020 \ 2021 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2022 "C1 with MDO profiling (tier 3) invocation notification " \ 2023 "frequency") \ 2024 range(0, 30) \ 2025 \ 2026 product(intx, Tier2CompileThreshold, 0, \ 2027 "threshold at which tier 2 compilation is invoked") \ 2028 range(0, max_jint) \ 2029 \ 2030 product(intx, Tier2BackEdgeThreshold, 0, \ 2031 "Back edge threshold at which tier 2 compilation is invoked") \ 2032 range(0, max_jint) \ 2033 \ 2034 product(intx, Tier3InvocationThreshold, 200, \ 2035 "Compile if number of method invocations crosses this " \ 2036 "threshold") \ 2037 range(0, max_jint) \ 2038 \ 2039 product(intx, Tier3MinInvocationThreshold, 100, \ 2040 "Minimum invocation to compile at tier 3") \ 2041 range(0, max_jint) \ 2042 \ 2043 product(intx, Tier3CompileThreshold, 2000, \ 2044 "Threshold at which tier 3 compilation is invoked (invocation " \ 2045 "minimum must be satisfied)") \ 2046 range(0, max_jint) \ 2047 \ 2048 product(intx, Tier3BackEdgeThreshold, 60000, \ 2049 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2050 range(0, max_jint) \ 2051 \ 2052 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2053 "Compile if number of method invocations crosses this " \ 2054 "threshold if coming from AOT") \ 2055 range(0, max_jint) \ 2056 \ 2057 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2058 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2059 range(0, max_jint) \ 2060 \ 2061 product(intx, Tier3AOTCompileThreshold, 15000, \ 2062 "Threshold at which tier 3 compilation is invoked (invocation " \ 2063 "minimum must be satisfied) if coming from AOT") \ 2064 range(0, max_jint) \ 2065 \ 2066 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2067 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2068 "if coming from AOT") \ 2069 range(0, max_jint) \ 2070 \ 2071 product(intx, Tier4InvocationThreshold, 5000, \ 2072 "Compile if number of method invocations crosses this " \ 2073 "threshold") \ 2074 range(0, max_jint) \ 2075 \ 2076 product(intx, Tier4MinInvocationThreshold, 600, \ 2077 "Minimum invocation to compile at tier 4") \ 2078 range(0, max_jint) \ 2079 \ 2080 product(intx, Tier4CompileThreshold, 15000, \ 2081 "Threshold at which tier 4 compilation is invoked (invocation " \ 2082 "minimum must be satisfied") \ 2083 range(0, max_jint) \ 2084 \ 2085 product(intx, Tier4BackEdgeThreshold, 40000, \ 2086 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2087 range(0, max_jint) \ 2088 \ 2089 product(intx, Tier3DelayOn, 5, \ 2090 "If C2 queue size grows over this amount per compiler thread " \ 2091 "stop compiling at tier 3 and start compiling at tier 2") \ 2092 range(0, max_jint) \ 2093 \ 2094 product(intx, Tier3DelayOff, 2, \ 2095 "If C2 queue size is less than this amount per compiler thread " \ 2096 "allow methods compiled at tier 2 transition to tier 3") \ 2097 range(0, max_jint) \ 2098 \ 2099 product(intx, Tier3LoadFeedback, 5, \ 2100 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2101 "reaches this amount per compiler thread") \ 2102 range(0, max_jint) \ 2103 \ 2104 product(intx, Tier4LoadFeedback, 3, \ 2105 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2106 "reaches this amount per compiler thread") \ 2107 range(0, max_jint) \ 2108 \ 2109 product(intx, TieredCompileTaskTimeout, 50, \ 2110 "Kill compile task if method was not used within " \ 2111 "given timeout in milliseconds") \ 2112 range(0, max_intx) \ 2113 \ 2114 product(intx, TieredStopAtLevel, 4, \ 2115 "Stop at given compilation level") \ 2116 range(0, 4) \ 2117 \ 2118 product(intx, Tier0ProfilingStartPercentage, 200, \ 2119 "Start profiling in interpreter if the counters exceed tier 3 " \ 2120 "thresholds by the specified percentage") \ 2121 range(0, max_jint) \ 2122 \ 2123 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2124 "Increase the compile threshold for C1 compilation if the code " \ 2125 "cache is filled by the specified percentage") \ 2126 range(0, 99) \ 2127 \ 2128 product(intx, TieredRateUpdateMinTime, 1, \ 2129 "Minimum rate sampling interval (in milliseconds)") \ 2130 range(0, max_intx) \ 2131 \ 2132 product(intx, TieredRateUpdateMaxTime, 25, \ 2133 "Maximum rate sampling interval (in milliseconds)") \ 2134 range(0, max_intx) \ 2135 \ 2136 product_pd(bool, TieredCompilation, \ 2137 "Enable tiered compilation") \ 2138 \ 2139 product(bool, PrintTieredEvents, false, \ 2140 "Print tiered events notifications") \ 2141 \ 2142 product_pd(intx, OnStackReplacePercentage, \ 2143 "NON_TIERED number of method invocations/branches (expressed as " \ 2144 "% of CompileThreshold) before (re-)compiling OSR code") \ 2145 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2146 \ 2147 product(intx, InterpreterProfilePercentage, 33, \ 2148 "NON_TIERED number of method invocations/branches (expressed as " \ 2149 "% of CompileThreshold) before profiling in the interpreter") \ 2150 range(0, 100) \ 2151 \ 2152 develop(intx, MaxRecompilationSearchLength, 10, \ 2153 "The maximum number of frames to inspect when searching for " \ 2154 "recompilee") \ 2155 \ 2156 develop(intx, MaxInterpretedSearchLength, 3, \ 2157 "The maximum number of interpreted frames to skip when searching "\ 2158 "for recompilee") \ 2159 \ 2160 develop(intx, DesiredMethodLimit, 8000, \ 2161 "The desired maximum method size (in bytecodes) after inlining") \ 2162 \ 2163 develop(intx, HugeMethodLimit, 8000, \ 2164 "Don't compile methods larger than this if " \ 2165 "+DontCompileHugeMethods") \ 2166 \ 2167 /* Properties for Java libraries */ \ 2168 \ 2169 product(uint64_t, MaxDirectMemorySize, 0, \ 2170 "Maximum total size of NIO direct-buffer allocations") \ 2171 range(0, max_jlong) \ 2172 \ 2173 /* Flags used for temporary code during development */ \ 2174 \ 2175 diagnostic(bool, UseNewCode, false, \ 2176 "Testing Only: Use the new version while testing") \ 2177 \ 2178 diagnostic(bool, UseNewCode2, false, \ 2179 "Testing Only: Use the new version while testing") \ 2180 \ 2181 diagnostic(bool, UseNewCode3, false, \ 2182 "Testing Only: Use the new version while testing") \ 2183 \ 2184 /* flags for performance data collection */ \ 2185 \ 2186 product(bool, UsePerfData, true, \ 2187 "Flag to disable jvmstat instrumentation for performance testing "\ 2188 "and problem isolation purposes") \ 2189 \ 2190 product(bool, PerfDataSaveToFile, false, \ 2191 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 2192 \ 2193 product(ccstr, PerfDataSaveFile, NULL, \ 2194 "Save PerfData memory to the specified absolute pathname. " \ 2195 "The string %p in the file name (if present) " \ 2196 "will be replaced by pid") \ 2197 \ 2198 product(intx, PerfDataSamplingInterval, 50, \ 2199 "Data sampling interval (in milliseconds)") \ 2200 range(PeriodicTask::min_interval, max_jint) \ 2201 constraint(PerfDataSamplingIntervalFunc, AfterErgo) \ 2202 \ 2203 product(bool, PerfDisableSharedMem, false, \ 2204 "Store performance data in standard memory") \ 2205 \ 2206 product(intx, PerfDataMemorySize, 32*K, \ 2207 "Size of performance data memory region. Will be rounded " \ 2208 "up to a multiple of the native os page size.") \ 2209 range(128, 32*64*K) \ 2210 \ 2211 product(intx, PerfMaxStringConstLength, 1024, \ 2212 "Maximum PerfStringConstant string length before truncation") \ 2213 range(32, 32*K) \ 2214 \ 2215 product(bool, PerfAllowAtExitRegistration, false, \ 2216 "Allow registration of atexit() methods") \ 2217 \ 2218 product(bool, PerfBypassFileSystemCheck, false, \ 2219 "Bypass Win32 file system criteria checks (Windows Only)") \ 2220 \ 2221 product(intx, UnguardOnExecutionViolation, 0, \ 2222 "Unguard page and retry on no-execute fault (Win32 only) " \ 2223 "0=off, 1=conservative, 2=aggressive") \ 2224 range(0, 2) \ 2225 \ 2226 /* Serviceability Support */ \ 2227 \ 2228 product(bool, ManagementServer, false, \ 2229 "Create JMX Management Server") \ 2230 \ 2231 product(bool, DisableAttachMechanism, false, \ 2232 "Disable mechanism that allows tools to attach to this VM") \ 2233 \ 2234 product(bool, StartAttachListener, false, \ 2235 "Always start Attach Listener at VM startup") \ 2236 \ 2237 product(bool, EnableDynamicAgentLoading, true, \ 2238 "Allow tools to load agents with the attach mechanism") \ 2239 \ 2240 manageable(bool, PrintConcurrentLocks, false, \ 2241 "Print java.util.concurrent locks in thread dump") \ 2242 \ 2243 /* Shared spaces */ \ 2244 \ 2245 product(bool, UseSharedSpaces, true, \ 2246 "Use shared spaces for metadata") \ 2247 \ 2248 product(bool, VerifySharedSpaces, false, \ 2249 "Verify integrity of shared spaces") \ 2250 \ 2251 product(bool, RequireSharedSpaces, false, \ 2252 "Require shared spaces for metadata") \ 2253 \ 2254 product(bool, DumpSharedSpaces, false, \ 2255 "Special mode: JVM reads a class list, loads classes, builds " \ 2256 "shared spaces, and dumps the shared spaces to a file to be " \ 2257 "used in future JVM runs") \ 2258 \ 2259 product(bool, DynamicDumpSharedSpaces, false, \ 2260 "Dynamic archive") \ 2261 \ 2262 product(bool, PrintSharedArchiveAndExit, false, \ 2263 "Print shared archive file contents") \ 2264 \ 2265 product(bool, PrintSharedDictionary, false, \ 2266 "If PrintSharedArchiveAndExit is true, also print the shared " \ 2267 "dictionary") \ 2268 \ 2269 product(size_t, SharedBaseAddress, LP64_ONLY(32*G) \ 2270 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 2271 "Address to allocate shared memory region for class data") \ 2272 range(0, SIZE_MAX) \ 2273 \ 2274 product(ccstr, SharedArchiveConfigFile, NULL, \ 2275 "Data to add to the CDS archive file") \ 2276 \ 2277 product(uintx, SharedSymbolTableBucketSize, 4, \ 2278 "Average number of symbols per bucket in shared table") \ 2279 range(2, 246) \ 2280 \ 2281 diagnostic(bool, AllowArchivingWithJavaAgent, false, \ 2282 "Allow Java agent to be run with CDS dumping") \ 2283 \ 2284 diagnostic(bool, PrintMethodHandleStubs, false, \ 2285 "Print generated stub code for method handles") \ 2286 \ 2287 develop(bool, TraceMethodHandles, false, \ 2288 "trace internal method handle operations") \ 2289 \ 2290 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 2291 "perform extra checks when constructing method handles") \ 2292 \ 2293 diagnostic(bool, ShowHiddenFrames, false, \ 2294 "show method handle implementation frames (usually hidden)") \ 2295 \ 2296 experimental(bool, TrustFinalNonStaticFields, false, \ 2297 "trust final non-static declarations for constant folding") \ 2298 \ 2299 diagnostic(bool, FoldStableValues, true, \ 2300 "Optimize loads from stable fields (marked w/ @Stable)") \ 2301 \ 2302 develop(bool, TraceInvokeDynamic, false, \ 2303 "trace internal invoke dynamic operations") \ 2304 \ 2305 diagnostic(int, UseBootstrapCallInfo, 1, \ 2306 "0: when resolving InDy or ConDy, force all BSM arguments to be " \ 2307 "resolved before the bootstrap method is called; 1: when a BSM " \ 2308 "that may accept a BootstrapCallInfo is detected, use that API " \ 2309 "to pass BSM arguments, which allows the BSM to delay their " \ 2310 "resolution; 2+: stress test the BCI API by calling more BSMs " \ 2311 "via that API, instead of with the eagerly-resolved array.") \ 2312 \ 2313 diagnostic(bool, PauseAtStartup, false, \ 2314 "Causes the VM to pause at startup time and wait for the pause " \ 2315 "file to be removed (default: ./vm.paused.<pid>)") \ 2316 \ 2317 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 2318 "The file to create and for whose removal to await when pausing " \ 2319 "at startup. (default: ./vm.paused.<pid>)") \ 2320 \ 2321 diagnostic(bool, PauseAtExit, false, \ 2322 "Pause and wait for keypress on exit if a debugger is attached") \ 2323 \ 2324 product(bool, ExtendedDTraceProbes, false, \ 2325 "Enable performance-impacting dtrace probes") \ 2326 \ 2327 product(bool, DTraceMethodProbes, false, \ 2328 "Enable dtrace probes for method-entry and method-exit") \ 2329 \ 2330 product(bool, DTraceAllocProbes, false, \ 2331 "Enable dtrace probes for object allocation") \ 2332 \ 2333 product(bool, DTraceMonitorProbes, false, \ 2334 "Enable dtrace probes for monitor events") \ 2335 \ 2336 product(bool, RelaxAccessControlCheck, false, \ 2337 "Relax the access control checks in the verifier") \ 2338 \ 2339 product(uintx, StringTableSize, defaultStringTableSize, \ 2340 "Number of buckets in the interned String table " \ 2341 "(will be rounded to nearest higher power of 2)") \ 2342 range(minimumStringTableSize, 16777216ul) \ 2343 \ 2344 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2345 "Number of buckets in the JVM internal Symbol table") \ 2346 range(minimumSymbolTableSize, 111*defaultSymbolTableSize) \ 2347 \ 2348 product(bool, UseStringDeduplication, false, \ 2349 "Use string deduplication") \ 2350 \ 2351 product(uintx, StringDeduplicationAgeThreshold, 3, \ 2352 "A string must reach this age (or be promoted to an old region) " \ 2353 "to be considered for deduplication") \ 2354 range(1, markOopDesc::max_age) \ 2355 \ 2356 diagnostic(bool, StringDeduplicationResizeALot, false, \ 2357 "Force table resize every time the table is scanned") \ 2358 \ 2359 diagnostic(bool, StringDeduplicationRehashALot, false, \ 2360 "Force table rehash every time the table is scanned") \ 2361 \ 2362 diagnostic(bool, WhiteBoxAPI, false, \ 2363 "Enable internal testing APIs") \ 2364 \ 2365 experimental(intx, SurvivorAlignmentInBytes, 0, \ 2366 "Default survivor space alignment in bytes") \ 2367 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2368 \ 2369 product(ccstr, DumpLoadedClassList, NULL, \ 2370 "Dump the names all loaded classes, that could be stored into " \ 2371 "the CDS archive, in the specified file") \ 2372 \ 2373 product(ccstr, SharedClassListFile, NULL, \ 2374 "Override the default CDS class list") \ 2375 \ 2376 product(ccstr, SharedArchiveFile, NULL, \ 2377 "Override the default location of the CDS archive file") \ 2378 \ 2379 product(ccstr, ArchiveClassesAtExit, NULL, \ 2380 "The path and name of the dynamic archive file") \ 2381 \ 2382 product(ccstr, ExtraSharedClassListFile, NULL, \ 2383 "Extra classlist for building the CDS archive file") \ 2384 \ 2385 experimental(size_t, ArrayAllocatorMallocLimit, \ 2386 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2387 "Allocation less than this value will be allocated " \ 2388 "using malloc. Larger allocations will use mmap.") \ 2389 \ 2390 experimental(bool, AlwaysAtomicAccesses, false, \ 2391 "Accesses to all variables should always be atomic") \ 2392 \ 2393 diagnostic(bool, UseUnalignedAccesses, false, \ 2394 "Use unaligned memory accesses in Unsafe") \ 2395 \ 2396 product_pd(bool, PreserveFramePointer, \ 2397 "Use the FP register for holding the frame pointer " \ 2398 "and not as a general purpose register.") \ 2399 \ 2400 diagnostic(bool, CheckIntrinsics, true, \ 2401 "When a class C is loaded, check that " \ 2402 "(1) all intrinsics defined by the VM for class C are present "\ 2403 "in the loaded class file and are marked with the " \ 2404 "@HotSpotIntrinsicCandidate annotation, that " \ 2405 "(2) there is an intrinsic registered for all loaded methods " \ 2406 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2407 "annotation, and that " \ 2408 "(3) no orphan methods exist for class C (i.e., methods for " \ 2409 "which the VM declares an intrinsic but that are not declared "\ 2410 "in the loaded class C. " \ 2411 "Check (3) is available only in debug builds.") \ 2412 \ 2413 diagnostic_pd(intx, InitArrayShortSize, \ 2414 "Threshold small size (in bytes) for clearing arrays. " \ 2415 "Anything this size or smaller may get converted to discrete " \ 2416 "scalar stores.") \ 2417 range(0, max_intx) \ 2418 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2419 \ 2420 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2421 "Disable backwards compatibility for compile commands.") \ 2422 \ 2423 diagnostic(bool, CompilerDirectivesPrint, false, \ 2424 "Print compiler directives on installation.") \ 2425 diagnostic(int, CompilerDirectivesLimit, 50, \ 2426 "Limit on number of compiler directives.") \ 2427 \ 2428 product(ccstr, AllocateHeapAt, NULL, \ 2429 "Path to the directoy where a temporary file will be created " \ 2430 "to use as the backing store for Java Heap.") \ 2431 \ 2432 experimental(ccstr, AllocateOldGenAt, NULL, \ 2433 "Path to the directoy where a temporary file will be " \ 2434 "created to use as the backing store for old generation." \ 2435 "File of size Xmx is pre-allocated for performance reason, so" \ 2436 "we need that much space available") \ 2437 \ 2438 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2439 "Run periodic metaspace verifications (0 - none, " \ 2440 "1 - always, >1 every nth interval)") \ 2441 \ 2442 diagnostic(bool, ShowRegistersOnAssert, true, \ 2443 "On internal errors, include registers in error report.") \ 2444 \ 2445 experimental(bool, UseSwitchProfiling, true, \ 2446 "leverage profiling for table/lookup switch") \ 2447 \ 2448 JFR_ONLY(product(bool, FlightRecorder, false, \ 2449 "(Deprecated) Enable Flight Recorder")) \ 2450 \ 2451 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2452 "Flight Recorder options")) \ 2453 \ 2454 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2455 "Start flight recording with options")) \ 2456 \ 2457 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2458 "Use platform unstable time where supported for timestamps only") 2459 2460 // Interface macros 2461 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2462 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2463 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2464 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2465 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2466 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2467 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2468 #ifdef PRODUCT 2469 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2470 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2471 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2472 #else 2473 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2474 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2475 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2476 #endif // PRODUCT 2477 // Special LP64 flags, product only needed for now. 2478 #ifdef _LP64 2479 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2480 #else 2481 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2482 #endif // _LP64 2483 2484 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2485 DECLARE_PD_DEVELOPER_FLAG, \ 2486 DECLARE_PRODUCT_FLAG, \ 2487 DECLARE_PD_PRODUCT_FLAG, \ 2488 DECLARE_DIAGNOSTIC_FLAG, \ 2489 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2490 DECLARE_EXPERIMENTAL_FLAG, \ 2491 DECLARE_NOTPRODUCT_FLAG, \ 2492 DECLARE_MANAGEABLE_FLAG, \ 2493 DECLARE_PRODUCT_RW_FLAG, \ 2494 DECLARE_LP64_PRODUCT_FLAG, \ 2495 IGNORE_RANGE, \ 2496 IGNORE_CONSTRAINT, \ 2497 IGNORE_WRITEABLE) 2498 2499 // Extensions 2500 2501 #include "runtime/globals_ext.hpp" 2502 2503 #endif // SHARE_RUNTIME_GLOBALS_HPP