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 develop(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, VerifyLastFrame, false, \ 402 "Verify oops on last frame on entry to VM") \ 403 \ 404 product(bool, SafepointTimeout, false, \ 405 "Time out and warn or fail after SafepointTimeoutDelay " \ 406 "milliseconds if failed to reach safepoint") \ 407 \ 408 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 409 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 410 \ 411 diagnostic(bool, AbortVMOnVMOperationTimeout, false, \ 412 "Abort upon failure to complete VM operation promptly") \ 413 \ 414 diagnostic(intx, AbortVMOnVMOperationTimeoutDelay, 1000, \ 415 "Delay in milliseconds for option AbortVMOnVMOperationTimeout") \ 416 range(0, max_intx) \ 417 \ 418 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 419 /* typically, at most a few retries are needed */ \ 420 product(intx, SuspendRetryCount, 50, \ 421 "Maximum retry count for an external suspend request") \ 422 range(0, max_intx) \ 423 \ 424 product(intx, SuspendRetryDelay, 5, \ 425 "Milliseconds to delay per retry (* current_retry_count)") \ 426 range(0, max_intx) \ 427 \ 428 product(bool, AssertOnSuspendWaitFailure, false, \ 429 "Assert/Guarantee on external suspend wait failure") \ 430 \ 431 product(bool, TraceSuspendWaitFailures, false, \ 432 "Trace external suspend wait failures") \ 433 \ 434 product(bool, MaxFDLimit, true, \ 435 "Bump the number of file descriptors to maximum in Solaris") \ 436 \ 437 diagnostic(bool, LogEvents, true, \ 438 "Enable the various ring buffer event logs") \ 439 \ 440 diagnostic(uintx, LogEventsBufferEntries, 20, \ 441 "Number of ring buffer event logs") \ 442 range(1, NOT_LP64(1*K) LP64_ONLY(1*M)) \ 443 \ 444 diagnostic(bool, BytecodeVerificationRemote, true, \ 445 "Enable the Java bytecode verifier for remote classes") \ 446 \ 447 diagnostic(bool, BytecodeVerificationLocal, false, \ 448 "Enable the Java bytecode verifier for local classes") \ 449 \ 450 develop(bool, ForceFloatExceptions, trueInDebug, \ 451 "Force exceptions on FP stack under/overflow") \ 452 \ 453 develop(bool, VerifyStackAtCalls, false, \ 454 "Verify that the stack pointer is unchanged after calls") \ 455 \ 456 develop(bool, TraceJavaAssertions, false, \ 457 "Trace java language assertions") \ 458 \ 459 notproduct(bool, VerifyCodeCache, false, \ 460 "Verify code cache on memory allocation/deallocation") \ 461 \ 462 develop(bool, UseMallocOnly, false, \ 463 "Use only malloc/free for allocation (no resource area/arena)") \ 464 \ 465 develop(bool, ZapResourceArea, trueInDebug, \ 466 "Zap freed resource/arena space with 0xABABABAB") \ 467 \ 468 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 469 "Zap freed VM handle space with 0xBCBCBCBC") \ 470 \ 471 notproduct(bool, ZapStackSegments, trueInDebug, \ 472 "Zap allocated/freed stack segments with 0xFADFADED") \ 473 \ 474 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 475 "Zap unused heap space with 0xBAADBABE") \ 476 \ 477 develop(bool, CheckZapUnusedHeapArea, false, \ 478 "Check zapping of unused heap space") \ 479 \ 480 develop(bool, ZapFillerObjects, trueInDebug, \ 481 "Zap filler objects with 0xDEAFBABE") \ 482 \ 483 develop(bool, PrintVMMessages, true, \ 484 "Print VM messages on console") \ 485 \ 486 notproduct(uintx, ErrorHandlerTest, 0, \ 487 "If > 0, provokes an error after VM initialization; the value " \ 488 "determines which error to provoke. See test_error_handler() " \ 489 "in vmError.cpp.") \ 490 \ 491 notproduct(uintx, TestCrashInErrorHandler, 0, \ 492 "If > 0, provokes an error inside VM error handler (a secondary " \ 493 "crash). see test_error_handler() in vmError.cpp") \ 494 \ 495 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 496 "If true, tests SafeFetch inside error handler.") \ 497 \ 498 notproduct(bool, TestUnresponsiveErrorHandler, false, \ 499 "If true, simulates an unresponsive error handler.") \ 500 \ 501 develop(bool, Verbose, false, \ 502 "Print additional debugging information from other modes") \ 503 \ 504 develop(bool, PrintMiscellaneous, false, \ 505 "Print uncategorized debugging information (requires +Verbose)") \ 506 \ 507 develop(bool, WizardMode, false, \ 508 "Print much more debugging information") \ 509 \ 510 product(bool, ShowMessageBoxOnError, false, \ 511 "Keep process alive on VM fatal error") \ 512 \ 513 product(bool, CreateCoredumpOnCrash, true, \ 514 "Create core/mini dump on VM fatal error") \ 515 \ 516 product(uint64_t, ErrorLogTimeout, 2 * 60, \ 517 "Timeout, in seconds, to limit the time spent on writing an " \ 518 "error log in case of a crash.") \ 519 range(0, (uint64_t)max_jlong/1000) \ 520 \ 521 product_pd(bool, UseOSErrorReporting, \ 522 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 523 \ 524 product(bool, SuppressFatalErrorMessage, false, \ 525 "Report NO fatal error message (avoid deadlock)") \ 526 \ 527 product(ccstrlist, OnError, "", \ 528 "Run user-defined commands on fatal error; see VMError.cpp " \ 529 "for examples") \ 530 \ 531 product(ccstrlist, OnOutOfMemoryError, "", \ 532 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 533 \ 534 manageable(bool, HeapDumpBeforeFullGC, false, \ 535 "Dump heap to file before any major stop-the-world GC") \ 536 \ 537 manageable(bool, HeapDumpAfterFullGC, false, \ 538 "Dump heap to file after any major stop-the-world GC") \ 539 \ 540 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 541 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 542 \ 543 manageable(ccstr, HeapDumpPath, NULL, \ 544 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 545 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 546 "in the working directory)") \ 547 \ 548 develop(bool, BreakAtWarning, false, \ 549 "Execute breakpoint upon encountering VM warning") \ 550 \ 551 product(ccstr, NativeMemoryTracking, "off", \ 552 "Native memory tracking options") \ 553 \ 554 diagnostic(bool, PrintNMTStatistics, false, \ 555 "Print native memory tracking summary data if it is on") \ 556 \ 557 diagnostic(bool, LogCompilation, false, \ 558 "Log compilation activity in detail to LogFile") \ 559 \ 560 product(bool, PrintCompilation, false, \ 561 "Print compilations") \ 562 \ 563 product(bool, PrintExtendedThreadInfo, false, \ 564 "Print more information in thread dump") \ 565 \ 566 diagnostic(intx, ScavengeRootsInCode, 2, \ 567 "0: do not allow scavengable oops in the code cache; " \ 568 "1: allow scavenging from the code cache; " \ 569 "2: emit as many constants as the compiler can see") \ 570 range(0, 2) \ 571 \ 572 product(bool, AlwaysRestoreFPU, false, \ 573 "Restore the FPU control word after every JNI call (expensive)") \ 574 \ 575 diagnostic(bool, PrintCompilation2, false, \ 576 "Print additional statistics per compilation") \ 577 \ 578 diagnostic(bool, PrintAdapterHandlers, false, \ 579 "Print code generated for i2c/c2i adapters") \ 580 \ 581 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 582 "Verify that i2c/c2i adapters are called properly") \ 583 \ 584 develop(bool, VerifyAdapterSharing, false, \ 585 "Verify that the code for shared adapters is the equivalent") \ 586 \ 587 diagnostic(bool, PrintAssembly, false, \ 588 "Print assembly code (using external disassembler.so)") \ 589 \ 590 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 591 "Print options string passed to disassembler.so") \ 592 \ 593 notproduct(bool, PrintNMethodStatistics, false, \ 594 "Print a summary statistic for the generated nmethods") \ 595 \ 596 diagnostic(bool, PrintNMethods, false, \ 597 "Print assembly code for nmethods when generated") \ 598 \ 599 diagnostic(bool, PrintNativeNMethods, false, \ 600 "Print assembly code for native nmethods when generated") \ 601 \ 602 develop(bool, PrintDebugInfo, false, \ 603 "Print debug information for all nmethods when generated") \ 604 \ 605 develop(bool, PrintRelocations, false, \ 606 "Print relocation information for all nmethods when generated") \ 607 \ 608 develop(bool, PrintDependencies, false, \ 609 "Print dependency information for all nmethods when generated") \ 610 \ 611 develop(bool, PrintExceptionHandlers, false, \ 612 "Print exception handler tables for all nmethods when generated") \ 613 \ 614 develop(bool, StressCompiledExceptionHandlers, false, \ 615 "Exercise compiled exception handlers") \ 616 \ 617 develop(bool, InterceptOSException, false, \ 618 "Start debugger when an implicit OS (e.g. NULL) " \ 619 "exception happens") \ 620 \ 621 product(bool, PrintCodeCache, false, \ 622 "Print the code cache memory usage when exiting") \ 623 \ 624 develop(bool, PrintCodeCache2, false, \ 625 "Print detailed usage information on the code cache when exiting")\ 626 \ 627 product(bool, PrintCodeCacheOnCompilation, false, \ 628 "Print the code cache memory usage each time a method is " \ 629 "compiled") \ 630 \ 631 diagnostic(bool, PrintCodeHeapAnalytics, false, \ 632 "Print code heap usage statistics on exit and on full condition") \ 633 \ 634 diagnostic(bool, PrintStubCode, false, \ 635 "Print generated stub code") \ 636 \ 637 product(bool, StackTraceInThrowable, true, \ 638 "Collect backtrace in throwable when exception happens") \ 639 \ 640 product(bool, OmitStackTraceInFastThrow, true, \ 641 "Omit backtraces for some 'hot' exceptions in optimized code") \ 642 \ 643 manageable(bool, ShowCodeDetailsInExceptionMessages, false, \ 644 "Show exception messages from RuntimeExceptions that contain " \ 645 "snippets of the failing code. Disable this to improve privacy.") \ 646 \ 647 product(bool, PrintWarnings, true, \ 648 "Print JVM warnings to output stream") \ 649 \ 650 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 651 "Print warnings for stalled SpinLocks") \ 652 \ 653 product(bool, RegisterFinalizersAtInit, true, \ 654 "Register finalizable objects at end of Object.<init> or " \ 655 "after allocation") \ 656 \ 657 develop(bool, RegisterReferences, true, \ 658 "Tell whether the VM should register soft/weak/final/phantom " \ 659 "references") \ 660 \ 661 develop(bool, IgnoreRewrites, false, \ 662 "Suppress rewrites of bytecodes in the oopmap generator. " \ 663 "This is unsafe!") \ 664 \ 665 develop(bool, PrintCodeCacheExtension, false, \ 666 "Print extension of code cache") \ 667 \ 668 develop(bool, UsePrivilegedStack, true, \ 669 "Enable the security JVM functions") \ 670 \ 671 develop(bool, ProtectionDomainVerification, true, \ 672 "Verify protection domain before resolution in system dictionary")\ 673 \ 674 product(bool, ClassUnloading, true, \ 675 "Do unloading of classes") \ 676 \ 677 product(bool, ClassUnloadingWithConcurrentMark, true, \ 678 "Do unloading of classes with a concurrent marking cycle") \ 679 \ 680 develop(bool, DisableStartThread, false, \ 681 "Disable starting of additional Java threads " \ 682 "(for debugging only)") \ 683 \ 684 develop(bool, MemProfiling, false, \ 685 "Write memory usage profiling to log file") \ 686 \ 687 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 688 "Print the system dictionary at exit") \ 689 \ 690 diagnostic(bool, DynamicallyResizeSystemDictionaries, true, \ 691 "Dynamically resize system dictionaries as needed") \ 692 \ 693 product(bool, AlwaysLockClassLoader, false, \ 694 "Require the VM to acquire the class loader lock before calling " \ 695 "loadClass() even for class loaders registering " \ 696 "as parallel capable") \ 697 \ 698 product(bool, AllowParallelDefineClass, false, \ 699 "Allow parallel defineClass requests for class loaders " \ 700 "registering as parallel capable") \ 701 \ 702 product_pd(bool, DontYieldALot, \ 703 "Throw away obvious excess yield calls") \ 704 \ 705 develop(bool, UseDetachedThreads, true, \ 706 "Use detached threads that are recycled upon termination " \ 707 "(for Solaris only)") \ 708 \ 709 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 710 "Disable the use of stack guard pages if the JVM is loaded " \ 711 "on the primordial process thread") \ 712 \ 713 product(bool, UseLWPSynchronization, true, \ 714 "Use LWP-based instead of libthread-based synchronization " \ 715 "(SPARC only)") \ 716 \ 717 product(intx, MonitorBound, 0, "(Deprecated) Bound Monitor population") \ 718 range(0, max_jint) \ 719 \ 720 diagnostic(bool, AsyncDeflateIdleMonitors, true, \ 721 "Deflate idle monitors using JavaThreads and the ServiceThread.") \ 722 \ 723 /* notice: the max range value here is max_jint, not max_intx */ \ 724 /* because of overflow issue */ \ 725 diagnostic(intx, AsyncDeflationInterval, 250, \ 726 "Async deflate idle monitors every so many milliseconds when " \ 727 "MonitorUsedDeflationThreshold is exceeded (0 is off).") \ 728 range(0, max_jint) \ 729 \ 730 diagnostic_pd(bool, HandshakeAfterDeflateIdleMonitors, \ 731 "Handshake with all JavaThreads after async deflating idle " \ 732 "monitors to force threads to leave C2 monitor code.") \ 733 \ 734 experimental(intx, MonitorUsedDeflationThreshold, 90, \ 735 "Percentage of used monitors before triggering deflation (0 is " \ 736 "off). The check is performed on GuaranteedSafepointInterval " \ 737 "or AsyncDeflateInterval.") \ 738 range(0, 100) \ 739 \ 740 experimental(intx, hashCode, 5, \ 741 "(Unstable) select hashCode generation algorithm") \ 742 \ 743 product(bool, FilterSpuriousWakeups, true, \ 744 "When true prevents OS-level spurious, or premature, wakeups " \ 745 "from Object.wait (Ignored for Windows)") \ 746 \ 747 develop(bool, UsePthreads, false, \ 748 "Use pthread-based instead of libthread-based synchronization " \ 749 "(SPARC only)") \ 750 \ 751 product(bool, ReduceSignalUsage, false, \ 752 "Reduce the use of OS signals in Java and/or the VM") \ 753 \ 754 develop(bool, LoadLineNumberTables, true, \ 755 "Tell whether the class file parser loads line number tables") \ 756 \ 757 develop(bool, LoadLocalVariableTables, true, \ 758 "Tell whether the class file parser loads local variable tables") \ 759 \ 760 develop(bool, LoadLocalVariableTypeTables, true, \ 761 "Tell whether the class file parser loads local variable type" \ 762 "tables") \ 763 \ 764 product(bool, AllowUserSignalHandlers, false, \ 765 "Do not complain if the application installs signal handlers " \ 766 "(Solaris & Linux only)") \ 767 \ 768 product(bool, UseSignalChaining, true, \ 769 "Use signal-chaining to invoke signal handlers installed " \ 770 "by the application (Solaris & Linux only)") \ 771 \ 772 product(bool, RestoreMXCSROnJNICalls, false, \ 773 "Restore MXCSR when returning from JNI calls") \ 774 \ 775 product(bool, CheckJNICalls, false, \ 776 "Verify all arguments to JNI calls") \ 777 \ 778 product(bool, UseFastJNIAccessors, true, \ 779 "Use optimized versions of Get<Primitive>Field") \ 780 \ 781 product(intx, MaxJNILocalCapacity, 65536, \ 782 "Maximum allowable local JNI handle capacity to " \ 783 "EnsureLocalCapacity() and PushLocalFrame(), " \ 784 "where <= 0 is unlimited, default: 65536") \ 785 range(min_intx, max_intx) \ 786 \ 787 product(bool, EagerXrunInit, false, \ 788 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 789 "but not all -Xrun libraries may support the state of the VM " \ 790 "at this time") \ 791 \ 792 product(bool, PreserveAllAnnotations, false, \ 793 "Preserve RuntimeInvisibleAnnotations as well " \ 794 "as RuntimeVisibleAnnotations") \ 795 \ 796 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 797 "Number of OutOfMemoryErrors preallocated with backtrace") \ 798 \ 799 product(bool, UseXMMForArrayCopy, false, \ 800 "Use SSE2 MOVQ instruction for Arraycopy") \ 801 \ 802 product(intx, FieldsAllocationStyle, 1, \ 803 "(Deprecated) 0 - type based with oops first, " \ 804 "1 - with oops last, " \ 805 "2 - oops in super and sub classes are together") \ 806 range(0, 2) \ 807 \ 808 product(bool, CompactFields, true, \ 809 "(Deprecated) Allocate nonstatic fields in gaps " \ 810 "between previous fields") \ 811 \ 812 notproduct(bool, PrintFieldLayout, false, \ 813 "Print field layout for each class") \ 814 \ 815 /* Need to limit the extent of the padding to reasonable size. */\ 816 /* 8K is well beyond the reasonable HW cache line size, even with */\ 817 /* aggressive prefetching, while still leaving the room for segregating */\ 818 /* among the distinct pages. */\ 819 product(intx, ContendedPaddingWidth, 128, \ 820 "How many bytes to pad the fields/classes marked @Contended with")\ 821 range(0, 8192) \ 822 constraint(ContendedPaddingWidthConstraintFunc,AfterErgo) \ 823 \ 824 product(bool, EnableContended, true, \ 825 "Enable @Contended annotation support") \ 826 \ 827 product(bool, RestrictContended, true, \ 828 "Restrict @Contended to trusted classes") \ 829 \ 830 product(bool, UseBiasedLocking, true, \ 831 "Enable biased locking in JVM") \ 832 \ 833 product(intx, BiasedLockingStartupDelay, 0, \ 834 "Number of milliseconds to wait before enabling biased locking") \ 835 range(0, (intx)(max_jint-(max_jint%PeriodicTask::interval_gran))) \ 836 constraint(BiasedLockingStartupDelayFunc,AfterErgo) \ 837 \ 838 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 839 "Print statistics of biased locking in JVM") \ 840 \ 841 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 842 "Threshold of number of revocations per type to try to " \ 843 "rebias all objects in the heap of that type") \ 844 range(0, max_intx) \ 845 constraint(BiasedLockingBulkRebiasThresholdFunc,AfterErgo) \ 846 \ 847 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 848 "Threshold of number of revocations per type to permanently " \ 849 "revoke biases of all objects in the heap of that type") \ 850 range(0, max_intx) \ 851 constraint(BiasedLockingBulkRevokeThresholdFunc,AfterErgo) \ 852 \ 853 product(intx, BiasedLockingDecayTime, 25000, \ 854 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 855 "type after previous bulk rebias") \ 856 range(500, max_intx) \ 857 constraint(BiasedLockingDecayTimeFunc,AfterErgo) \ 858 \ 859 product(bool, ExitOnOutOfMemoryError, false, \ 860 "JVM exits on the first occurrence of an out-of-memory error") \ 861 \ 862 product(bool, CrashOnOutOfMemoryError, false, \ 863 "JVM aborts, producing an error log and core/mini dump, on the " \ 864 "first occurrence of an out-of-memory error") \ 865 \ 866 /* tracing */ \ 867 \ 868 develop(bool, StressRewriter, false, \ 869 "Stress linktime bytecode rewriting") \ 870 \ 871 product(ccstr, TraceJVMTI, NULL, \ 872 "Trace flags for JVMTI functions and events") \ 873 \ 874 /* This option can change an EMCP method into an obsolete method. */ \ 875 /* This can affect tests that except specific methods to be EMCP. */ \ 876 /* This option should be used with caution. */ \ 877 product(bool, StressLdcRewrite, false, \ 878 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 879 \ 880 /* change to false by default sometime after Mustang */ \ 881 product(bool, VerifyMergedCPBytecodes, true, \ 882 "Verify bytecodes after RedefineClasses constant pool merging") \ 883 \ 884 product(bool, AllowRedefinitionToAddDeleteMethods, false, \ 885 "(Deprecated) Allow redefinition to add and delete private " \ 886 "static or final methods for compatibility with old releases") \ 887 \ 888 develop(bool, TraceBytecodes, false, \ 889 "Trace bytecode execution") \ 890 \ 891 develop(bool, TraceICs, false, \ 892 "Trace inline cache changes") \ 893 \ 894 notproduct(bool, TraceInvocationCounterOverflow, false, \ 895 "Trace method invocation counter overflow") \ 896 \ 897 develop(bool, TraceInlineCacheClearing, false, \ 898 "Trace clearing of inline caches in nmethods") \ 899 \ 900 develop(bool, TraceDependencies, false, \ 901 "Trace dependencies") \ 902 \ 903 develop(bool, VerifyDependencies, trueInDebug, \ 904 "Exercise and verify the compilation dependency mechanism") \ 905 \ 906 develop(bool, TraceNewOopMapGeneration, false, \ 907 "Trace OopMapGeneration") \ 908 \ 909 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 910 "Trace OopMapGeneration: print detailed cell states") \ 911 \ 912 develop(bool, TimeOopMap, false, \ 913 "Time calls to GenerateOopMap::compute_map() in sum") \ 914 \ 915 develop(bool, TimeOopMap2, false, \ 916 "Time calls to GenerateOopMap::compute_map() individually") \ 917 \ 918 develop(bool, TraceOopMapRewrites, false, \ 919 "Trace rewriting of method oops during oop map generation") \ 920 \ 921 develop(bool, TraceICBuffer, false, \ 922 "Trace usage of IC buffer") \ 923 \ 924 develop(bool, TraceCompiledIC, false, \ 925 "Trace changes of compiled IC") \ 926 \ 927 develop(bool, FLSVerifyDictionary, false, \ 928 "Do lots of (expensive) FLS dictionary verification") \ 929 \ 930 \ 931 notproduct(bool, CheckMemoryInitialization, false, \ 932 "Check memory initialization") \ 933 \ 934 product(uintx, ProcessDistributionStride, 4, \ 935 "Stride through processors when distributing processes") \ 936 range(0, max_juint) \ 937 \ 938 develop(bool, TraceFinalizerRegistration, false, \ 939 "Trace registration of final references") \ 940 \ 941 product(bool, IgnoreEmptyClassPaths, false, \ 942 "Ignore empty path elements in -classpath") \ 943 \ 944 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 945 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 946 "Initial size of the boot class loader data metaspace") \ 947 range(30*K, max_uintx/BytesPerWord) \ 948 constraint(InitialBootClassLoaderMetaspaceSizeConstraintFunc, AfterErgo)\ 949 \ 950 product(bool, PrintHeapAtSIGBREAK, true, \ 951 "Print heap layout in response to SIGBREAK") \ 952 \ 953 manageable(bool, PrintClassHistogram, false, \ 954 "Print a histogram of class instances") \ 955 \ 956 experimental(double, ObjectCountCutOffPercent, 0.5, \ 957 "The percentage of the used heap that the instances of a class " \ 958 "must occupy for the class to generate a trace event") \ 959 range(0.0, 100.0) \ 960 \ 961 /* JVMTI heap profiling */ \ 962 \ 963 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 964 "Trace JVMTI object tagging calls") \ 965 \ 966 diagnostic(bool, VerifyBeforeIteration, false, \ 967 "Verify memory system before JVMTI iteration") \ 968 \ 969 /* compiler interface */ \ 970 \ 971 develop(bool, CIPrintCompilerName, false, \ 972 "when CIPrint is active, print the name of the active compiler") \ 973 \ 974 diagnostic(bool, CIPrintCompileQueue, false, \ 975 "display the contents of the compile queue whenever a " \ 976 "compilation is enqueued") \ 977 \ 978 develop(bool, CIPrintRequests, false, \ 979 "display every request for compilation") \ 980 \ 981 product(bool, CITime, false, \ 982 "collect timing information for compilation") \ 983 \ 984 develop(bool, CITimeVerbose, false, \ 985 "be more verbose in compilation timings") \ 986 \ 987 develop(bool, CITimeEach, false, \ 988 "display timing information after each successful compilation") \ 989 \ 990 develop(bool, CICountOSR, false, \ 991 "use a separate counter when assigning ids to osr compilations") \ 992 \ 993 develop(bool, CICompileNatives, true, \ 994 "compile native methods if supported by the compiler") \ 995 \ 996 develop_pd(bool, CICompileOSR, \ 997 "compile on stack replacement methods if supported by the " \ 998 "compiler") \ 999 \ 1000 develop(bool, CIPrintMethodCodes, false, \ 1001 "print method bytecodes of the compiled code") \ 1002 \ 1003 develop(bool, CIPrintTypeFlow, false, \ 1004 "print the results of ciTypeFlow analysis") \ 1005 \ 1006 develop(bool, CITraceTypeFlow, false, \ 1007 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 1008 \ 1009 develop(intx, OSROnlyBCI, -1, \ 1010 "OSR only at this bci. Negative values mean exclude that bci") \ 1011 \ 1012 /* compiler */ \ 1013 \ 1014 /* notice: the max range value here is max_jint, not max_intx */ \ 1015 /* because of overflow issue */ \ 1016 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 1017 "Number of compiler threads to run") \ 1018 range(0, max_jint) \ 1019 constraint(CICompilerCountConstraintFunc, AfterErgo) \ 1020 \ 1021 product(bool, UseDynamicNumberOfCompilerThreads, true, \ 1022 "Dynamically choose the number of parallel compiler threads") \ 1023 \ 1024 diagnostic(bool, ReduceNumberOfCompilerThreads, true, \ 1025 "Reduce the number of parallel compiler threads when they " \ 1026 "are not used") \ 1027 \ 1028 diagnostic(bool, TraceCompilerThreads, false, \ 1029 "Trace creation and removal of compiler threads") \ 1030 \ 1031 develop(bool, InjectCompilerCreationFailure, false, \ 1032 "Inject thread creation failures for " \ 1033 "UseDynamicNumberOfCompilerThreads") \ 1034 \ 1035 develop(bool, UseStackBanging, true, \ 1036 "use stack banging for stack overflow checks (required for " \ 1037 "proper StackOverflow handling; disable only to measure cost " \ 1038 "of stackbanging)") \ 1039 \ 1040 develop(bool, UseStrictFP, true, \ 1041 "use strict fp if modifier strictfp is set") \ 1042 \ 1043 develop(bool, GenerateSynchronizationCode, true, \ 1044 "generate locking/unlocking code for synchronized methods and " \ 1045 "monitors") \ 1046 \ 1047 develop(bool, GenerateRangeChecks, true, \ 1048 "Generate range checks for array accesses") \ 1049 \ 1050 diagnostic_pd(bool, ImplicitNullChecks, \ 1051 "Generate code for implicit null checks") \ 1052 \ 1053 product_pd(bool, TrapBasedNullChecks, \ 1054 "Generate code for null checks that uses a cmp and trap " \ 1055 "instruction raising SIGTRAP. This is only used if an access to" \ 1056 "null (+offset) will not raise a SIGSEGV, i.e.," \ 1057 "ImplicitNullChecks don't work (PPC64).") \ 1058 \ 1059 diagnostic(bool, EnableThreadSMRExtraValidityChecks, true, \ 1060 "Enable Thread SMR extra validity checks") \ 1061 \ 1062 diagnostic(bool, EnableThreadSMRStatistics, trueInDebug, \ 1063 "Enable Thread SMR Statistics") \ 1064 \ 1065 product(bool, UseNotificationThread, true, \ 1066 "Use Notification Thread") \ 1067 \ 1068 product(bool, Inline, true, \ 1069 "Enable inlining") \ 1070 \ 1071 product(bool, ClipInlining, true, \ 1072 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 1073 \ 1074 develop(bool, UseCHA, true, \ 1075 "Enable CHA") \ 1076 \ 1077 product(bool, UseTypeProfile, true, \ 1078 "Check interpreter profile for historically monomorphic calls") \ 1079 \ 1080 diagnostic(bool, PrintInlining, false, \ 1081 "Print inlining optimizations") \ 1082 \ 1083 product(bool, UsePopCountInstruction, false, \ 1084 "Use population count instruction") \ 1085 \ 1086 develop(bool, EagerInitialization, false, \ 1087 "Eagerly initialize classes if possible") \ 1088 \ 1089 diagnostic(bool, LogTouchedMethods, false, \ 1090 "Log methods which have been ever touched in runtime") \ 1091 \ 1092 diagnostic(bool, PrintTouchedMethodsAtExit, false, \ 1093 "Print all methods that have been ever touched in runtime") \ 1094 \ 1095 develop(bool, TraceMethodReplacement, false, \ 1096 "Print when methods are replaced do to recompilation") \ 1097 \ 1098 develop(bool, PrintMethodFlushing, false, \ 1099 "Print the nmethods being flushed") \ 1100 \ 1101 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 1102 "print statistics about method flushing") \ 1103 \ 1104 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 1105 "Number of compiled code invocations after which " \ 1106 "the method is considered as hot by the flusher") \ 1107 range(1, max_jint) \ 1108 \ 1109 diagnostic(intx, MinPassesBeforeFlush, 10, \ 1110 "Minimum number of sweeper passes before an nmethod " \ 1111 "can be flushed") \ 1112 range(0, max_intx) \ 1113 \ 1114 product(bool, UseCodeAging, true, \ 1115 "Insert counter to detect warm methods") \ 1116 \ 1117 diagnostic(bool, StressCodeAging, false, \ 1118 "Start with counters compiled in") \ 1119 \ 1120 develop(bool, StressCodeBuffers, false, \ 1121 "Exercise code buffer expansion and other rare state changes") \ 1122 \ 1123 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 1124 "Generate extra debugging information for non-safepoints in " \ 1125 "nmethods") \ 1126 \ 1127 product(bool, PrintVMOptions, false, \ 1128 "Print flags that appeared on the command line") \ 1129 \ 1130 product(bool, IgnoreUnrecognizedVMOptions, false, \ 1131 "Ignore unrecognized VM options") \ 1132 \ 1133 product(bool, PrintCommandLineFlags, false, \ 1134 "Print flags specified on command line or set by ergonomics") \ 1135 \ 1136 product(bool, PrintFlagsInitial, false, \ 1137 "Print all VM flags before argument processing and exit VM") \ 1138 \ 1139 product(bool, PrintFlagsFinal, false, \ 1140 "Print all VM flags after argument and ergonomic processing") \ 1141 \ 1142 notproduct(bool, PrintFlagsWithComments, false, \ 1143 "Print all VM flags with default values and descriptions and " \ 1144 "exit") \ 1145 \ 1146 product(bool, PrintFlagsRanges, false, \ 1147 "Print VM flags and their ranges") \ 1148 \ 1149 diagnostic(bool, SerializeVMOutput, true, \ 1150 "Use a mutex to serialize output to tty and LogFile") \ 1151 \ 1152 diagnostic(bool, DisplayVMOutput, true, \ 1153 "Display all VM output on the tty, independently of LogVMOutput") \ 1154 \ 1155 diagnostic(bool, LogVMOutput, false, \ 1156 "Save VM output to LogFile") \ 1157 \ 1158 diagnostic(ccstr, LogFile, NULL, \ 1159 "If LogVMOutput or LogCompilation is on, save VM output to " \ 1160 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 1161 \ 1162 product(ccstr, ErrorFile, NULL, \ 1163 "If an error occurs, save the error data to this file " \ 1164 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 1165 \ 1166 product(bool, ExtensiveErrorReports, \ 1167 PRODUCT_ONLY(false) NOT_PRODUCT(true), \ 1168 "Error reports are more extensive.") \ 1169 \ 1170 product(bool, DisplayVMOutputToStderr, false, \ 1171 "If DisplayVMOutput is true, display all VM output to stderr") \ 1172 \ 1173 product(bool, DisplayVMOutputToStdout, false, \ 1174 "If DisplayVMOutput is true, display all VM output to stdout") \ 1175 \ 1176 product(bool, ErrorFileToStderr, false, \ 1177 "If true, error data is printed to stderr instead of a file") \ 1178 \ 1179 product(bool, ErrorFileToStdout, false, \ 1180 "If true, error data is printed to stdout instead of a file") \ 1181 \ 1182 product(bool, UseHeavyMonitors, false, \ 1183 "use heavyweight instead of lightweight Java monitors") \ 1184 \ 1185 product(bool, PrintStringTableStatistics, false, \ 1186 "print statistics about the StringTable and SymbolTable") \ 1187 \ 1188 diagnostic(bool, VerifyStringTableAtExit, false, \ 1189 "verify StringTable contents at exit") \ 1190 \ 1191 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 1192 "print histogram of the symbol table") \ 1193 \ 1194 notproduct(bool, ExitVMOnVerifyError, false, \ 1195 "standard exit from VM if bytecode verify error " \ 1196 "(only in debug mode)") \ 1197 \ 1198 diagnostic(ccstr, AbortVMOnException, NULL, \ 1199 "Call fatal if this exception is thrown. Example: " \ 1200 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 1201 \ 1202 diagnostic(ccstr, AbortVMOnExceptionMessage, NULL, \ 1203 "Call fatal if the exception pointed by AbortVMOnException " \ 1204 "has this message") \ 1205 \ 1206 develop(bool, DebugVtables, false, \ 1207 "add debugging code to vtable dispatch") \ 1208 \ 1209 notproduct(bool, PrintVtableStats, false, \ 1210 "print vtables stats at end of run") \ 1211 \ 1212 develop(bool, TraceCreateZombies, false, \ 1213 "trace creation of zombie nmethods") \ 1214 \ 1215 product(bool, RangeCheckElimination, true, \ 1216 "Eliminate range checks") \ 1217 \ 1218 develop_pd(bool, UncommonNullCast, \ 1219 "track occurrences of null in casts; adjust compiler tactics") \ 1220 \ 1221 develop(bool, TypeProfileCasts, true, \ 1222 "treat casts like calls for purposes of type profiling") \ 1223 \ 1224 develop(bool, TraceLivenessGen, false, \ 1225 "Trace the generation of liveness analysis information") \ 1226 \ 1227 notproduct(bool, TraceLivenessQuery, false, \ 1228 "Trace queries of liveness analysis information") \ 1229 \ 1230 notproduct(bool, CollectIndexSetStatistics, false, \ 1231 "Collect information about IndexSets") \ 1232 \ 1233 develop(bool, UseLoopSafepoints, true, \ 1234 "Generate Safepoint nodes in every loop") \ 1235 \ 1236 develop(intx, FastAllocateSizeLimit, 128*K, \ 1237 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 1238 "Inline allocations larger than this in doublewords must go slow")\ 1239 \ 1240 product_pd(bool, CompactStrings, \ 1241 "Enable Strings to use single byte chars in backing store") \ 1242 \ 1243 product_pd(uintx, TypeProfileLevel, \ 1244 "=XYZ, with Z: Type profiling of arguments at call; " \ 1245 "Y: Type profiling of return value at call; " \ 1246 "X: Type profiling of parameters to methods; " \ 1247 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 1248 constraint(TypeProfileLevelConstraintFunc, AfterErgo) \ 1249 \ 1250 product(intx, TypeProfileArgsLimit, 2, \ 1251 "max number of call arguments to consider for type profiling") \ 1252 range(0, 16) \ 1253 \ 1254 product(intx, TypeProfileParmsLimit, 2, \ 1255 "max number of incoming parameters to consider for type profiling"\ 1256 ", -1 for all") \ 1257 range(-1, 64) \ 1258 \ 1259 /* statistics */ \ 1260 develop(bool, CountCompiledCalls, false, \ 1261 "Count method invocations") \ 1262 \ 1263 notproduct(bool, CountRuntimeCalls, false, \ 1264 "Count VM runtime calls") \ 1265 \ 1266 develop(bool, CountJNICalls, false, \ 1267 "Count jni method invocations") \ 1268 \ 1269 notproduct(bool, CountJVMCalls, false, \ 1270 "Count jvm method invocations") \ 1271 \ 1272 notproduct(bool, CountRemovableExceptions, false, \ 1273 "Count exceptions that could be replaced by branches due to " \ 1274 "inlining") \ 1275 \ 1276 notproduct(bool, ICMissHistogram, false, \ 1277 "Produce histogram of IC misses") \ 1278 \ 1279 /* interpreter */ \ 1280 product_pd(bool, RewriteBytecodes, \ 1281 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 1282 \ 1283 product_pd(bool, RewriteFrequentPairs, \ 1284 "Rewrite frequently used bytecode pairs into a single bytecode") \ 1285 \ 1286 diagnostic(bool, PrintInterpreter, false, \ 1287 "Print the generated interpreter code") \ 1288 \ 1289 product(bool, UseInterpreter, true, \ 1290 "Use interpreter for non-compiled methods") \ 1291 \ 1292 develop(bool, UseFastSignatureHandlers, true, \ 1293 "Use fast signature handlers for native calls") \ 1294 \ 1295 product(bool, UseLoopCounter, true, \ 1296 "Increment invocation counter on backward branch") \ 1297 \ 1298 product_pd(bool, UseOnStackReplacement, \ 1299 "Use on stack replacement, calls runtime if invoc. counter " \ 1300 "overflows in loop") \ 1301 \ 1302 notproduct(bool, TraceOnStackReplacement, false, \ 1303 "Trace on stack replacement") \ 1304 \ 1305 product_pd(bool, PreferInterpreterNativeStubs, \ 1306 "Use always interpreter stubs for native methods invoked via " \ 1307 "interpreter") \ 1308 \ 1309 develop(bool, CountBytecodes, false, \ 1310 "Count number of bytecodes executed") \ 1311 \ 1312 develop(bool, PrintBytecodeHistogram, false, \ 1313 "Print histogram of the executed bytecodes") \ 1314 \ 1315 develop(bool, PrintBytecodePairHistogram, false, \ 1316 "Print histogram of the executed bytecode pairs") \ 1317 \ 1318 diagnostic(bool, PrintSignatureHandlers, false, \ 1319 "Print code generated for native method signature handlers") \ 1320 \ 1321 develop(bool, VerifyOops, false, \ 1322 "Do plausibility checks for oops") \ 1323 \ 1324 develop(bool, CheckUnhandledOops, false, \ 1325 "Check for unhandled oops in VM code") \ 1326 \ 1327 develop(bool, VerifyJNIFields, trueInDebug, \ 1328 "Verify jfieldIDs for instance fields") \ 1329 \ 1330 notproduct(bool, VerifyJNIEnvThread, false, \ 1331 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 1332 "from JNI") \ 1333 \ 1334 develop(bool, VerifyFPU, false, \ 1335 "Verify FPU state (check for NaN's, etc.)") \ 1336 \ 1337 develop(bool, VerifyThread, false, \ 1338 "Watch the thread register for corruption (SPARC only)") \ 1339 \ 1340 develop(bool, VerifyActivationFrameSize, false, \ 1341 "Verify that activation frame didn't become smaller than its " \ 1342 "minimal size") \ 1343 \ 1344 develop(bool, TraceFrequencyInlining, false, \ 1345 "Trace frequency based inlining") \ 1346 \ 1347 develop_pd(bool, InlineIntrinsics, \ 1348 "Inline intrinsics that can be statically resolved") \ 1349 \ 1350 product_pd(bool, ProfileInterpreter, \ 1351 "Profile at the bytecode level during interpretation") \ 1352 \ 1353 develop(bool, TraceProfileInterpreter, false, \ 1354 "Trace profiling at the bytecode level during interpretation. " \ 1355 "This outputs the profiling information collected to improve " \ 1356 "jit compilation.") \ 1357 \ 1358 develop_pd(bool, ProfileTraps, \ 1359 "Profile deoptimization traps at the bytecode level") \ 1360 \ 1361 product(intx, ProfileMaturityPercentage, 20, \ 1362 "number of method invocations/branches (expressed as % of " \ 1363 "CompileThreshold) before using the method's profile") \ 1364 range(0, 100) \ 1365 \ 1366 diagnostic(bool, PrintMethodData, false, \ 1367 "Print the results of +ProfileInterpreter at end of run") \ 1368 \ 1369 develop(bool, VerifyDataPointer, trueInDebug, \ 1370 "Verify the method data pointer during interpreter profiling") \ 1371 \ 1372 develop(bool, VerifyCompiledCode, false, \ 1373 "Include miscellaneous runtime verifications in nmethod code; " \ 1374 "default off because it disturbs nmethod size heuristics") \ 1375 \ 1376 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 1377 "Manually make GC thread crash then dump java stack trace; " \ 1378 "Test only") \ 1379 \ 1380 /* compilation */ \ 1381 product(bool, UseCompiler, true, \ 1382 "Use Just-In-Time compilation") \ 1383 \ 1384 product(bool, UseCounterDecay, true, \ 1385 "Adjust recompilation counters") \ 1386 \ 1387 develop(intx, CounterHalfLifeTime, 30, \ 1388 "Half-life time of invocation counters (in seconds)") \ 1389 \ 1390 develop(intx, CounterDecayMinIntervalLength, 500, \ 1391 "The minimum interval (in milliseconds) between invocation of " \ 1392 "CounterDecay") \ 1393 \ 1394 product(bool, AlwaysCompileLoopMethods, false, \ 1395 "When using recompilation, never interpret methods " \ 1396 "containing loops") \ 1397 \ 1398 product(bool, DontCompileHugeMethods, true, \ 1399 "Do not compile methods > HugeMethodLimit") \ 1400 \ 1401 /* Bytecode escape analysis estimation. */ \ 1402 product(bool, EstimateArgEscape, true, \ 1403 "Analyze bytecodes to estimate escape state of arguments") \ 1404 \ 1405 product(intx, BCEATraceLevel, 0, \ 1406 "How much tracing to do of bytecode escape analysis estimates " \ 1407 "(0-3)") \ 1408 range(0, 3) \ 1409 \ 1410 product(intx, MaxBCEAEstimateLevel, 5, \ 1411 "Maximum number of nested calls that are analyzed by BC EA") \ 1412 range(0, max_jint) \ 1413 \ 1414 product(intx, MaxBCEAEstimateSize, 150, \ 1415 "Maximum bytecode size of a method to be analyzed by BC EA") \ 1416 range(0, max_jint) \ 1417 \ 1418 product(intx, AllocatePrefetchStyle, 1, \ 1419 "0 = no prefetch, " \ 1420 "1 = generate prefetch instructions for each allocation, " \ 1421 "2 = use TLAB watermark to gate allocation prefetch, " \ 1422 "3 = generate one prefetch instruction per cache line") \ 1423 range(0, 3) \ 1424 \ 1425 product(intx, AllocatePrefetchDistance, -1, \ 1426 "Distance to prefetch ahead of allocation pointer. " \ 1427 "-1: use system-specific value (automatically determined") \ 1428 constraint(AllocatePrefetchDistanceConstraintFunc, AfterMemoryInit)\ 1429 \ 1430 product(intx, AllocatePrefetchLines, 3, \ 1431 "Number of lines to prefetch ahead of array allocation pointer") \ 1432 range(1, 64) \ 1433 \ 1434 product(intx, AllocateInstancePrefetchLines, 1, \ 1435 "Number of lines to prefetch ahead of instance allocation " \ 1436 "pointer") \ 1437 range(1, 64) \ 1438 \ 1439 product(intx, AllocatePrefetchStepSize, 16, \ 1440 "Step size in bytes of sequential prefetch instructions") \ 1441 range(1, 512) \ 1442 constraint(AllocatePrefetchStepSizeConstraintFunc,AfterMemoryInit)\ 1443 \ 1444 product(intx, AllocatePrefetchInstr, 0, \ 1445 "Select instruction to prefetch ahead of allocation pointer") \ 1446 constraint(AllocatePrefetchInstrConstraintFunc, AfterMemoryInit) \ 1447 \ 1448 /* deoptimization */ \ 1449 develop(bool, TraceDeoptimization, false, \ 1450 "Trace deoptimization") \ 1451 \ 1452 develop(bool, PrintDeoptimizationDetails, false, \ 1453 "Print more information about deoptimization") \ 1454 \ 1455 develop(bool, DebugDeoptimization, false, \ 1456 "Tracing various information while debugging deoptimization") \ 1457 \ 1458 product(intx, SelfDestructTimer, 0, \ 1459 "Will cause VM to terminate after a given time (in minutes) " \ 1460 "(0 means off)") \ 1461 range(0, max_intx) \ 1462 \ 1463 product(intx, MaxJavaStackTraceDepth, 1024, \ 1464 "The maximum number of lines in the stack trace for Java " \ 1465 "exceptions (0 means all)") \ 1466 range(0, max_jint/2) \ 1467 \ 1468 /* notice: the max range value here is max_jint, not max_intx */ \ 1469 /* because of overflow issue */ \ 1470 diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 1471 "Guarantee a safepoint (at least) every so many milliseconds " \ 1472 "(0 means none)") \ 1473 range(0, max_jint) \ 1474 \ 1475 product(intx, SafepointTimeoutDelay, 10000, \ 1476 "Delay in milliseconds for option SafepointTimeout") \ 1477 LP64_ONLY(range(0, max_intx/MICROUNITS)) \ 1478 NOT_LP64(range(0, max_intx)) \ 1479 \ 1480 product(intx, NmethodSweepActivity, 10, \ 1481 "Removes cold nmethods from code cache if > 0. Higher values " \ 1482 "result in more aggressive sweeping") \ 1483 range(0, 2000) \ 1484 \ 1485 notproduct(bool, LogSweeper, false, \ 1486 "Keep a ring buffer of sweeper activity") \ 1487 \ 1488 notproduct(intx, SweeperLogEntries, 1024, \ 1489 "Number of records in the ring buffer of sweeper activity") \ 1490 \ 1491 notproduct(intx, MemProfilingInterval, 500, \ 1492 "Time between each invocation of the MemProfiler") \ 1493 \ 1494 develop(intx, MallocCatchPtr, -1, \ 1495 "Hit breakpoint when mallocing/freeing this pointer") \ 1496 \ 1497 notproduct(ccstrlist, SuppressErrorAt, "", \ 1498 "List of assertions (file:line) to muzzle") \ 1499 \ 1500 develop(intx, StackPrintLimit, 100, \ 1501 "number of stack frames to print in VM-level stack dump") \ 1502 \ 1503 notproduct(intx, MaxElementPrintSize, 256, \ 1504 "maximum number of elements to print") \ 1505 \ 1506 notproduct(intx, MaxSubklassPrintSize, 4, \ 1507 "maximum number of subklasses to print when printing klass") \ 1508 \ 1509 product(intx, MaxInlineLevel, 9, \ 1510 "maximum number of nested calls that are inlined") \ 1511 range(0, max_jint) \ 1512 \ 1513 product(intx, MaxRecursiveInlineLevel, 1, \ 1514 "maximum number of nested recursive calls that are inlined") \ 1515 range(0, max_jint) \ 1516 \ 1517 develop(intx, MaxForceInlineLevel, 100, \ 1518 "maximum number of nested calls that are forced for inlining " \ 1519 "(using CompileCommand or marked w/ @ForceInline)") \ 1520 range(0, max_jint) \ 1521 \ 1522 product_pd(intx, InlineSmallCode, \ 1523 "Only inline already compiled methods if their code size is " \ 1524 "less than this") \ 1525 range(0, max_jint) \ 1526 \ 1527 product(intx, MaxInlineSize, 35, \ 1528 "The maximum bytecode size of a method to be inlined") \ 1529 range(0, max_jint) \ 1530 \ 1531 product_pd(intx, FreqInlineSize, \ 1532 "The maximum bytecode size of a frequent method to be inlined") \ 1533 range(0, max_jint) \ 1534 \ 1535 product(intx, MaxTrivialSize, 6, \ 1536 "The maximum bytecode size of a trivial method to be inlined") \ 1537 range(0, max_jint) \ 1538 \ 1539 product(intx, MinInliningThreshold, 250, \ 1540 "The minimum invocation count a method needs to have to be " \ 1541 "inlined") \ 1542 range(0, max_jint) \ 1543 \ 1544 develop(intx, MethodHistogramCutoff, 100, \ 1545 "The cutoff value for method invocation histogram (+CountCalls)") \ 1546 \ 1547 develop(intx, DontYieldALotInterval, 10, \ 1548 "Interval between which yields will be dropped (milliseconds)") \ 1549 \ 1550 notproduct(intx, DeoptimizeALotInterval, 5, \ 1551 "Number of exits until DeoptimizeALot kicks in") \ 1552 \ 1553 notproduct(intx, ZombieALotInterval, 5, \ 1554 "Number of exits until ZombieALot kicks in") \ 1555 \ 1556 diagnostic(uintx, MallocMaxTestWords, 0, \ 1557 "If non-zero, maximum number of words that malloc/realloc can " \ 1558 "allocate (for testing only)") \ 1559 range(0, max_uintx) \ 1560 \ 1561 product(intx, TypeProfileWidth, 2, \ 1562 "Number of receiver types to record in call/cast profile") \ 1563 range(0, 8) \ 1564 \ 1565 develop(intx, BciProfileWidth, 2, \ 1566 "Number of return bci's to record in ret profile") \ 1567 \ 1568 product(intx, PerMethodRecompilationCutoff, 400, \ 1569 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 1570 range(-1, max_intx) \ 1571 \ 1572 product(intx, PerBytecodeRecompilationCutoff, 200, \ 1573 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 1574 range(-1, max_intx) \ 1575 \ 1576 product(intx, PerMethodTrapLimit, 100, \ 1577 "Limit on traps (of one kind) in a method (includes inlines)") \ 1578 range(0, max_jint) \ 1579 \ 1580 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 1581 "Limit on speculative traps (of one kind) in a method " \ 1582 "(includes inlines)") \ 1583 range(0, max_jint) \ 1584 \ 1585 product(intx, PerBytecodeTrapLimit, 4, \ 1586 "Limit on traps (of one kind) at a particular BCI") \ 1587 range(0, max_jint) \ 1588 \ 1589 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 1590 "Extra method data trap entries for speculation") \ 1591 \ 1592 develop(intx, InlineFrequencyRatio, 20, \ 1593 "Ratio of call site execution to caller method invocation") \ 1594 range(0, max_jint) \ 1595 \ 1596 diagnostic_pd(intx, InlineFrequencyCount, \ 1597 "Count of call site execution necessary to trigger frequent " \ 1598 "inlining") \ 1599 range(0, max_jint) \ 1600 \ 1601 develop(intx, InlineThrowCount, 50, \ 1602 "Force inlining of interpreted methods that throw this often") \ 1603 range(0, max_jint) \ 1604 \ 1605 develop(intx, InlineThrowMaxSize, 200, \ 1606 "Force inlining of throwing methods smaller than this") \ 1607 range(0, max_jint) \ 1608 \ 1609 develop(intx, ProfilerNodeSize, 1024, \ 1610 "Size in K to allocate for the Profile Nodes of each thread") \ 1611 range(0, 1024) \ 1612 \ 1613 product_pd(size_t, MetaspaceSize, \ 1614 "Initial threshold (in bytes) at which a garbage collection " \ 1615 "is done to reduce Metaspace usage") \ 1616 constraint(MetaspaceSizeConstraintFunc,AfterErgo) \ 1617 \ 1618 product(size_t, MaxMetaspaceSize, max_uintx, \ 1619 "Maximum size of Metaspaces (in bytes)") \ 1620 constraint(MaxMetaspaceSizeConstraintFunc,AfterErgo) \ 1621 \ 1622 product(size_t, CompressedClassSpaceSize, 1*G, \ 1623 "Maximum size of class area in Metaspace when compressed " \ 1624 "class pointers are used") \ 1625 range(1*M, 3*G) \ 1626 \ 1627 manageable(uintx, MinHeapFreeRatio, 40, \ 1628 "The minimum percentage of heap free after GC to avoid expansion."\ 1629 " For most GCs this applies to the old generation. In G1 and" \ 1630 " ParallelGC it applies to the whole heap.") \ 1631 range(0, 100) \ 1632 constraint(MinHeapFreeRatioConstraintFunc,AfterErgo) \ 1633 \ 1634 manageable(uintx, MaxHeapFreeRatio, 70, \ 1635 "The maximum percentage of heap free after GC to avoid shrinking."\ 1636 " For most GCs this applies to the old generation. In G1 and" \ 1637 " ParallelGC it applies to the whole heap.") \ 1638 range(0, 100) \ 1639 constraint(MaxHeapFreeRatioConstraintFunc,AfterErgo) \ 1640 \ 1641 product(bool, ShrinkHeapInSteps, true, \ 1642 "When disabled, informs the GC to shrink the java heap directly" \ 1643 " to the target size at the next full GC rather than requiring" \ 1644 " smaller steps during multiple full GCs.") \ 1645 \ 1646 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 1647 "Number of milliseconds per MB of free space in the heap") \ 1648 range(0, max_intx) \ 1649 constraint(SoftRefLRUPolicyMSPerMBConstraintFunc,AfterMemoryInit) \ 1650 \ 1651 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 1652 "The minimum change in heap space due to GC (in bytes)") \ 1653 range(0, max_uintx) \ 1654 \ 1655 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 1656 "The minimum expansion of Metaspace (in bytes)") \ 1657 range(0, max_uintx) \ 1658 \ 1659 product(uintx, MaxMetaspaceFreeRatio, 70, \ 1660 "The maximum percentage of Metaspace free after GC to avoid " \ 1661 "shrinking") \ 1662 range(0, 100) \ 1663 constraint(MaxMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1664 \ 1665 product(uintx, MinMetaspaceFreeRatio, 40, \ 1666 "The minimum percentage of Metaspace free after GC to avoid " \ 1667 "expansion") \ 1668 range(0, 99) \ 1669 constraint(MinMetaspaceFreeRatioConstraintFunc,AfterErgo) \ 1670 \ 1671 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 1672 "The maximum expansion of Metaspace without full GC (in bytes)") \ 1673 range(0, max_uintx) \ 1674 \ 1675 /* stack parameters */ \ 1676 product_pd(intx, StackYellowPages, \ 1677 "Number of yellow zone (recoverable overflows) pages of size " \ 1678 "4KB. If pages are bigger yellow zone is aligned up.") \ 1679 range(MIN_STACK_YELLOW_PAGES, (DEFAULT_STACK_YELLOW_PAGES+5)) \ 1680 \ 1681 product_pd(intx, StackRedPages, \ 1682 "Number of red zone (unrecoverable overflows) pages of size " \ 1683 "4KB. If pages are bigger red zone is aligned up.") \ 1684 range(MIN_STACK_RED_PAGES, (DEFAULT_STACK_RED_PAGES+2)) \ 1685 \ 1686 product_pd(intx, StackReservedPages, \ 1687 "Number of reserved zone (reserved to annotated methods) pages" \ 1688 " of size 4KB. If pages are bigger reserved zone is aligned up.") \ 1689 range(MIN_STACK_RESERVED_PAGES, (DEFAULT_STACK_RESERVED_PAGES+10))\ 1690 \ 1691 product(bool, RestrictReservedStack, true, \ 1692 "Restrict @ReservedStackAccess to trusted classes") \ 1693 \ 1694 /* greater stack shadow pages can't generate instruction to bang stack */ \ 1695 product_pd(intx, StackShadowPages, \ 1696 "Number of shadow zone (for overflow checking) pages of size " \ 1697 "4KB. If pages are bigger shadow zone is aligned up. " \ 1698 "This should exceed the depth of the VM and native call stack.") \ 1699 range(MIN_STACK_SHADOW_PAGES, (DEFAULT_STACK_SHADOW_PAGES+30)) \ 1700 \ 1701 product_pd(intx, ThreadStackSize, \ 1702 "Thread Stack Size (in Kbytes)") \ 1703 range(0, 1 * M) \ 1704 \ 1705 product_pd(intx, VMThreadStackSize, \ 1706 "Non-Java Thread Stack Size (in Kbytes)") \ 1707 range(0, max_intx/(1 * K)) \ 1708 \ 1709 product_pd(intx, CompilerThreadStackSize, \ 1710 "Compiler Thread Stack Size (in Kbytes)") \ 1711 range(0, max_intx/(1 * K)) \ 1712 \ 1713 develop_pd(size_t, JVMInvokeMethodSlack, \ 1714 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 1715 \ 1716 /* code cache parameters */ \ 1717 develop_pd(uintx, CodeCacheSegmentSize, \ 1718 "Code cache segment size (in bytes) - smallest unit of " \ 1719 "allocation") \ 1720 range(1, 1024) \ 1721 constraint(CodeCacheSegmentSizeConstraintFunc, AfterErgo) \ 1722 \ 1723 develop_pd(intx, CodeEntryAlignment, \ 1724 "Code entry alignment for generated code (in bytes)") \ 1725 constraint(CodeEntryAlignmentConstraintFunc, AfterErgo) \ 1726 \ 1727 product_pd(intx, OptoLoopAlignment, \ 1728 "Align inner loops to zero relative to this modulus") \ 1729 range(1, 16) \ 1730 constraint(OptoLoopAlignmentConstraintFunc, AfterErgo) \ 1731 \ 1732 product_pd(uintx, InitialCodeCacheSize, \ 1733 "Initial code cache size (in bytes)") \ 1734 range(os::vm_page_size(), max_uintx) \ 1735 \ 1736 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 1737 "Minimum code cache size (in bytes) required to start VM.") \ 1738 range(0, max_uintx) \ 1739 \ 1740 product(bool, SegmentedCodeCache, false, \ 1741 "Use a segmented code cache") \ 1742 \ 1743 product_pd(uintx, ReservedCodeCacheSize, \ 1744 "Reserved code cache size (in bytes) - maximum code cache size") \ 1745 range(os::vm_page_size(), max_uintx) \ 1746 \ 1747 product_pd(uintx, NonProfiledCodeHeapSize, \ 1748 "Size of code heap with non-profiled methods (in bytes)") \ 1749 range(0, max_uintx) \ 1750 \ 1751 product_pd(uintx, ProfiledCodeHeapSize, \ 1752 "Size of code heap with profiled methods (in bytes)") \ 1753 range(0, max_uintx) \ 1754 \ 1755 product_pd(uintx, NonNMethodCodeHeapSize, \ 1756 "Size of code heap with non-nmethods (in bytes)") \ 1757 range(os::vm_page_size(), max_uintx) \ 1758 \ 1759 product_pd(uintx, CodeCacheExpansionSize, \ 1760 "Code cache expansion size (in bytes)") \ 1761 range(32*K, max_uintx) \ 1762 \ 1763 diagnostic_pd(uintx, CodeCacheMinBlockLength, \ 1764 "Minimum number of segments in a code cache block") \ 1765 range(1, 100) \ 1766 \ 1767 notproduct(bool, ExitOnFullCodeCache, false, \ 1768 "Exit the VM if we fill the code cache") \ 1769 \ 1770 product(bool, UseCodeCacheFlushing, true, \ 1771 "Remove cold/old nmethods from the code cache") \ 1772 \ 1773 product(uintx, StartAggressiveSweepingAt, 10, \ 1774 "Start aggressive sweeping if X[%] of the code cache is free." \ 1775 "Segmented code cache: X[%] of the non-profiled heap." \ 1776 "Non-segmented code cache: X[%] of the total code cache") \ 1777 range(0, 100) \ 1778 \ 1779 /* AOT parameters */ \ 1780 experimental(bool, UseAOT, false, \ 1781 "Use AOT compiled files") \ 1782 \ 1783 experimental(ccstrlist, AOTLibrary, NULL, \ 1784 "AOT library") \ 1785 \ 1786 experimental(bool, PrintAOT, false, \ 1787 "Print used AOT klasses and methods") \ 1788 \ 1789 notproduct(bool, PrintAOTStatistics, false, \ 1790 "Print AOT statistics") \ 1791 \ 1792 diagnostic(bool, UseAOTStrictLoading, false, \ 1793 "Exit the VM if any of the AOT libraries has invalid config") \ 1794 \ 1795 product(bool, CalculateClassFingerprint, false, \ 1796 "Calculate class fingerprint") \ 1797 \ 1798 /* interpreter debugging */ \ 1799 develop(intx, BinarySwitchThreshold, 5, \ 1800 "Minimal number of lookupswitch entries for rewriting to binary " \ 1801 "switch") \ 1802 \ 1803 develop(intx, StopInterpreterAt, 0, \ 1804 "Stop interpreter execution at specified bytecode number") \ 1805 \ 1806 develop(intx, TraceBytecodesAt, 0, \ 1807 "Trace bytecodes starting with specified bytecode number") \ 1808 \ 1809 /* compiler interface */ \ 1810 develop(intx, CIStart, 0, \ 1811 "The id of the first compilation to permit") \ 1812 \ 1813 develop(intx, CIStop, max_jint, \ 1814 "The id of the last compilation to permit") \ 1815 \ 1816 develop(intx, CIStartOSR, 0, \ 1817 "The id of the first osr compilation to permit " \ 1818 "(CICountOSR must be on)") \ 1819 \ 1820 develop(intx, CIStopOSR, max_jint, \ 1821 "The id of the last osr compilation to permit " \ 1822 "(CICountOSR must be on)") \ 1823 \ 1824 develop(intx, CIBreakAtOSR, -1, \ 1825 "The id of osr compilation to break at") \ 1826 \ 1827 develop(intx, CIBreakAt, -1, \ 1828 "The id of compilation to break at") \ 1829 \ 1830 product(ccstrlist, CompileOnly, "", \ 1831 "List of methods (pkg/class.name) to restrict compilation to") \ 1832 \ 1833 product(ccstr, CompileCommandFile, NULL, \ 1834 "Read compiler commands from this file [.hotspot_compiler]") \ 1835 \ 1836 diagnostic(ccstr, CompilerDirectivesFile, NULL, \ 1837 "Read compiler directives from this file") \ 1838 \ 1839 product(ccstrlist, CompileCommand, "", \ 1840 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 1841 \ 1842 develop(bool, ReplayCompiles, false, \ 1843 "Enable replay of compilations from ReplayDataFile") \ 1844 \ 1845 product(ccstr, ReplayDataFile, NULL, \ 1846 "File containing compilation replay information" \ 1847 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 1848 \ 1849 product(ccstr, InlineDataFile, NULL, \ 1850 "File containing inlining replay information" \ 1851 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 1852 \ 1853 develop(intx, ReplaySuppressInitializers, 2, \ 1854 "Control handling of class initialization during replay: " \ 1855 "0 - don't do anything special; " \ 1856 "1 - treat all class initializers as empty; " \ 1857 "2 - treat class initializers for application classes as empty; " \ 1858 "3 - allow all class initializers to run during bootstrap but " \ 1859 " pretend they are empty after starting replay") \ 1860 range(0, 3) \ 1861 \ 1862 develop(bool, ReplayIgnoreInitErrors, false, \ 1863 "Ignore exceptions thrown during initialization for replay") \ 1864 \ 1865 product(bool, DumpReplayDataOnError, true, \ 1866 "Record replay data for crashing compiler threads") \ 1867 \ 1868 product(bool, CICompilerCountPerCPU, false, \ 1869 "1 compiler thread for log(N CPUs)") \ 1870 \ 1871 notproduct(intx, CICrashAt, -1, \ 1872 "id of compilation to trigger assert in compiler thread for " \ 1873 "the purpose of testing, e.g. generation of replay data") \ 1874 notproduct(bool, CIObjectFactoryVerify, false, \ 1875 "enable potentially expensive verification in ciObjectFactory") \ 1876 \ 1877 diagnostic(bool, AbortVMOnCompilationFailure, false, \ 1878 "Abort VM when method had failed to compile.") \ 1879 \ 1880 /* Priorities */ \ 1881 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 1882 \ 1883 product(intx, ThreadPriorityPolicy, 0, \ 1884 "0 : Normal. "\ 1885 " VM chooses priorities that are appropriate for normal "\ 1886 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 1887 " to normal native priority. Java priorities below " \ 1888 " NORM_PRIORITY map to lower native priority values. On "\ 1889 " Windows applications are allowed to use higher native "\ 1890 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 1891 " not use the highest possible native priority, "\ 1892 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 1893 " system threads. On Linux thread priorities are ignored "\ 1894 " because the OS does not support static priority in "\ 1895 " SCHED_OTHER scheduling class which is the only choice for "\ 1896 " non-root, non-realtime applications. "\ 1897 "1 : Aggressive. "\ 1898 " Java thread priorities map over to the entire range of "\ 1899 " native thread priorities. Higher Java thread priorities map "\ 1900 " to higher native thread priorities. This policy should be "\ 1901 " used with care, as sometimes it can cause performance "\ 1902 " degradation in the application and/or the entire system. On "\ 1903 " Linux/BSD/macOS this policy requires root privilege or an "\ 1904 " extended capability.") \ 1905 range(0, 1) \ 1906 \ 1907 product(bool, ThreadPriorityVerbose, false, \ 1908 "Print priority changes") \ 1909 \ 1910 product(intx, CompilerThreadPriority, -1, \ 1911 "The native priority at which compiler threads should run " \ 1912 "(-1 means no change)") \ 1913 range(min_jint, max_jint) \ 1914 constraint(CompilerThreadPriorityConstraintFunc, AfterErgo) \ 1915 \ 1916 product(intx, VMThreadPriority, -1, \ 1917 "The native priority at which the VM thread should run " \ 1918 "(-1 means no change)") \ 1919 range(-1, 127) \ 1920 \ 1921 product(intx, JavaPriority1_To_OSPriority, -1, \ 1922 "Map Java priorities to OS priorities") \ 1923 range(-1, 127) \ 1924 \ 1925 product(intx, JavaPriority2_To_OSPriority, -1, \ 1926 "Map Java priorities to OS priorities") \ 1927 range(-1, 127) \ 1928 \ 1929 product(intx, JavaPriority3_To_OSPriority, -1, \ 1930 "Map Java priorities to OS priorities") \ 1931 range(-1, 127) \ 1932 \ 1933 product(intx, JavaPriority4_To_OSPriority, -1, \ 1934 "Map Java priorities to OS priorities") \ 1935 range(-1, 127) \ 1936 \ 1937 product(intx, JavaPriority5_To_OSPriority, -1, \ 1938 "Map Java priorities to OS priorities") \ 1939 range(-1, 127) \ 1940 \ 1941 product(intx, JavaPriority6_To_OSPriority, -1, \ 1942 "Map Java priorities to OS priorities") \ 1943 range(-1, 127) \ 1944 \ 1945 product(intx, JavaPriority7_To_OSPriority, -1, \ 1946 "Map Java priorities to OS priorities") \ 1947 range(-1, 127) \ 1948 \ 1949 product(intx, JavaPriority8_To_OSPriority, -1, \ 1950 "Map Java priorities to OS priorities") \ 1951 range(-1, 127) \ 1952 \ 1953 product(intx, JavaPriority9_To_OSPriority, -1, \ 1954 "Map Java priorities to OS priorities") \ 1955 range(-1, 127) \ 1956 \ 1957 product(intx, JavaPriority10_To_OSPriority,-1, \ 1958 "Map Java priorities to OS priorities") \ 1959 range(-1, 127) \ 1960 \ 1961 experimental(bool, UseCriticalJavaThreadPriority, false, \ 1962 "Java thread priority 10 maps to critical scheduling priority") \ 1963 \ 1964 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 1965 "Compiler thread(s) run at critical scheduling priority") \ 1966 \ 1967 experimental(bool, UseCriticalCMSThreadPriority, false, \ 1968 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 1969 \ 1970 develop(intx, NewCodeParameter, 0, \ 1971 "Testing Only: Create a dedicated integer parameter before " \ 1972 "putback") \ 1973 \ 1974 /* new oopmap storage allocation */ \ 1975 develop(intx, MinOopMapAllocation, 8, \ 1976 "Minimum number of OopMap entries in an OopMapSet") \ 1977 \ 1978 /* Background Compilation */ \ 1979 develop(intx, LongCompileThreshold, 50, \ 1980 "Used with +TraceLongCompiles") \ 1981 \ 1982 /* recompilation */ \ 1983 product_pd(intx, CompileThreshold, \ 1984 "number of interpreted method invocations before (re-)compiling") \ 1985 constraint(CompileThresholdConstraintFunc, AfterErgo) \ 1986 \ 1987 product(double, CompileThresholdScaling, 1.0, \ 1988 "Factor to control when first compilation happens " \ 1989 "(both with and without tiered compilation): " \ 1990 "values greater than 1.0 delay counter overflow, " \ 1991 "values between 0 and 1.0 rush counter overflow, " \ 1992 "value of 1.0 leaves compilation thresholds unchanged " \ 1993 "value of 0.0 is equivalent to -Xint. " \ 1994 "" \ 1995 "Flag can be set as per-method option. " \ 1996 "If a value is specified for a method, compilation thresholds " \ 1997 "for that method are scaled by both the value of the global flag "\ 1998 "and the value of the per-method flag.") \ 1999 range(0.0, DBL_MAX) \ 2000 \ 2001 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 2002 "Interpreter (tier 0) invocation notification frequency") \ 2003 range(0, 30) \ 2004 \ 2005 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 2006 "C1 without MDO (tier 2) invocation notification frequency") \ 2007 range(0, 30) \ 2008 \ 2009 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 2010 "C1 with MDO profiling (tier 3) invocation notification " \ 2011 "frequency") \ 2012 range(0, 30) \ 2013 \ 2014 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 2015 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 2016 range(0, 30) \ 2017 \ 2018 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 2019 "Interpreter (tier 0) invocation notification frequency") \ 2020 range(0, 30) \ 2021 \ 2022 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 2023 "C1 without MDO (tier 2) invocation notification frequency") \ 2024 range(0, 30) \ 2025 \ 2026 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 2027 "C1 with MDO profiling (tier 3) invocation notification " \ 2028 "frequency") \ 2029 range(0, 30) \ 2030 \ 2031 product(intx, Tier2CompileThreshold, 0, \ 2032 "threshold at which tier 2 compilation is invoked") \ 2033 range(0, max_jint) \ 2034 \ 2035 product(intx, Tier2BackEdgeThreshold, 0, \ 2036 "Back edge threshold at which tier 2 compilation is invoked") \ 2037 range(0, max_jint) \ 2038 \ 2039 product(intx, Tier3InvocationThreshold, 200, \ 2040 "Compile if number of method invocations crosses this " \ 2041 "threshold") \ 2042 range(0, max_jint) \ 2043 \ 2044 product(intx, Tier3MinInvocationThreshold, 100, \ 2045 "Minimum invocation to compile at tier 3") \ 2046 range(0, max_jint) \ 2047 \ 2048 product(intx, Tier3CompileThreshold, 2000, \ 2049 "Threshold at which tier 3 compilation is invoked (invocation " \ 2050 "minimum must be satisfied)") \ 2051 range(0, max_jint) \ 2052 \ 2053 product(intx, Tier3BackEdgeThreshold, 60000, \ 2054 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 2055 range(0, max_jint) \ 2056 \ 2057 product(intx, Tier3AOTInvocationThreshold, 10000, \ 2058 "Compile if number of method invocations crosses this " \ 2059 "threshold if coming from AOT") \ 2060 range(0, max_jint) \ 2061 \ 2062 product(intx, Tier3AOTMinInvocationThreshold, 1000, \ 2063 "Minimum invocation to compile at tier 3 if coming from AOT") \ 2064 range(0, max_jint) \ 2065 \ 2066 product(intx, Tier3AOTCompileThreshold, 15000, \ 2067 "Threshold at which tier 3 compilation is invoked (invocation " \ 2068 "minimum must be satisfied) if coming from AOT") \ 2069 range(0, max_jint) \ 2070 \ 2071 product(intx, Tier3AOTBackEdgeThreshold, 120000, \ 2072 "Back edge threshold at which tier 3 OSR compilation is invoked " \ 2073 "if coming from AOT") \ 2074 range(0, max_jint) \ 2075 \ 2076 product(intx, Tier4InvocationThreshold, 5000, \ 2077 "Compile if number of method invocations crosses this " \ 2078 "threshold") \ 2079 range(0, max_jint) \ 2080 \ 2081 product(intx, Tier4MinInvocationThreshold, 600, \ 2082 "Minimum invocation to compile at tier 4") \ 2083 range(0, max_jint) \ 2084 \ 2085 product(intx, Tier4CompileThreshold, 15000, \ 2086 "Threshold at which tier 4 compilation is invoked (invocation " \ 2087 "minimum must be satisfied") \ 2088 range(0, max_jint) \ 2089 \ 2090 product(intx, Tier4BackEdgeThreshold, 40000, \ 2091 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 2092 range(0, max_jint) \ 2093 \ 2094 product(intx, Tier3DelayOn, 5, \ 2095 "If C2 queue size grows over this amount per compiler thread " \ 2096 "stop compiling at tier 3 and start compiling at tier 2") \ 2097 range(0, max_jint) \ 2098 \ 2099 product(intx, Tier3DelayOff, 2, \ 2100 "If C2 queue size is less than this amount per compiler thread " \ 2101 "allow methods compiled at tier 2 transition to tier 3") \ 2102 range(0, max_jint) \ 2103 \ 2104 product(intx, Tier3LoadFeedback, 5, \ 2105 "Tier 3 thresholds will increase twofold when C1 queue size " \ 2106 "reaches this amount per compiler thread") \ 2107 range(0, max_jint) \ 2108 \ 2109 product(intx, Tier4LoadFeedback, 3, \ 2110 "Tier 4 thresholds will increase twofold when C2 queue size " \ 2111 "reaches this amount per compiler thread") \ 2112 range(0, max_jint) \ 2113 \ 2114 product(intx, TieredCompileTaskTimeout, 50, \ 2115 "Kill compile task if method was not used within " \ 2116 "given timeout in milliseconds") \ 2117 range(0, max_intx) \ 2118 \ 2119 product(intx, TieredStopAtLevel, 4, \ 2120 "Stop at given compilation level") \ 2121 range(0, 4) \ 2122 \ 2123 product(intx, Tier0ProfilingStartPercentage, 200, \ 2124 "Start profiling in interpreter if the counters exceed tier 3 " \ 2125 "thresholds by the specified percentage") \ 2126 range(0, max_jint) \ 2127 \ 2128 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 2129 "Increase the compile threshold for C1 compilation if the code " \ 2130 "cache is filled by the specified percentage") \ 2131 range(0, 99) \ 2132 \ 2133 product(intx, TieredRateUpdateMinTime, 1, \ 2134 "Minimum rate sampling interval (in milliseconds)") \ 2135 range(0, max_intx) \ 2136 \ 2137 product(intx, TieredRateUpdateMaxTime, 25, \ 2138 "Maximum rate sampling interval (in milliseconds)") \ 2139 range(0, max_intx) \ 2140 \ 2141 product_pd(bool, TieredCompilation, \ 2142 "Enable tiered compilation") \ 2143 \ 2144 product(bool, PrintTieredEvents, false, \ 2145 "Print tiered events notifications") \ 2146 \ 2147 product_pd(intx, OnStackReplacePercentage, \ 2148 "NON_TIERED number of method invocations/branches (expressed as " \ 2149 "% of CompileThreshold) before (re-)compiling OSR code") \ 2150 constraint(OnStackReplacePercentageConstraintFunc, AfterErgo) \ 2151 \ 2152 product(intx, InterpreterProfilePercentage, 33, \ 2153 "NON_TIERED number of method invocations/branches (expressed as " \ 2154 "% of CompileThreshold) before profiling in the interpreter") \ 2155 range(0, 100) \ 2156 \ 2157 develop(intx, DesiredMethodLimit, 8000, \ 2158 "The desired maximum method size (in bytecodes) after inlining") \ 2159 \ 2160 develop(intx, HugeMethodLimit, 8000, \ 2161 "Don't compile methods larger than this if " \ 2162 "+DontCompileHugeMethods") \ 2163 \ 2164 /* Properties for Java libraries */ \ 2165 \ 2166 product(uint64_t, MaxDirectMemorySize, 0, \ 2167 "Maximum total size of NIO direct-buffer allocations") \ 2168 range(0, max_jlong) \ 2169 \ 2170 product(bool, ClassForNameDeferLinking, false, \ 2171 "Revert to not linking in Class.forName()") \ 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 /* 2^24 */) \ 2343 \ 2344 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 2345 "Number of buckets in the JVM internal Symbol table") \ 2346 range(minimumSymbolTableSize, 16777216ul /* 2^24 */) \ 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, markWord::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 range(8, 256) \ 2368 constraint(SurvivorAlignmentInBytesConstraintFunc,AfterErgo) \ 2369 \ 2370 product(ccstr, DumpLoadedClassList, NULL, \ 2371 "Dump the names all loaded classes, that could be stored into " \ 2372 "the CDS archive, in the specified file") \ 2373 \ 2374 product(ccstr, SharedClassListFile, NULL, \ 2375 "Override the default CDS class list") \ 2376 \ 2377 product(ccstr, SharedArchiveFile, NULL, \ 2378 "Override the default location of the CDS archive file") \ 2379 \ 2380 product(ccstr, ArchiveClassesAtExit, NULL, \ 2381 "The path and name of the dynamic archive file") \ 2382 \ 2383 product(ccstr, ExtraSharedClassListFile, NULL, \ 2384 "Extra classlist for building the CDS archive file") \ 2385 \ 2386 experimental(size_t, ArrayAllocatorMallocLimit, \ 2387 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 2388 "Allocation less than this value will be allocated " \ 2389 "using malloc. Larger allocations will use mmap.") \ 2390 \ 2391 experimental(bool, AlwaysAtomicAccesses, false, \ 2392 "Accesses to all variables should always be atomic") \ 2393 \ 2394 diagnostic(bool, UseUnalignedAccesses, false, \ 2395 "Use unaligned memory accesses in Unsafe") \ 2396 \ 2397 product_pd(bool, PreserveFramePointer, \ 2398 "Use the FP register for holding the frame pointer " \ 2399 "and not as a general purpose register.") \ 2400 \ 2401 diagnostic(bool, CheckIntrinsics, true, \ 2402 "When a class C is loaded, check that " \ 2403 "(1) all intrinsics defined by the VM for class C are present "\ 2404 "in the loaded class file and are marked with the " \ 2405 "@HotSpotIntrinsicCandidate annotation, that " \ 2406 "(2) there is an intrinsic registered for all loaded methods " \ 2407 "that are annotated with the @HotSpotIntrinsicCandidate " \ 2408 "annotation, and that " \ 2409 "(3) no orphan methods exist for class C (i.e., methods for " \ 2410 "which the VM declares an intrinsic but that are not declared "\ 2411 "in the loaded class C. " \ 2412 "Check (3) is available only in debug builds.") \ 2413 \ 2414 diagnostic_pd(intx, InitArrayShortSize, \ 2415 "Threshold small size (in bytes) for clearing arrays. " \ 2416 "Anything this size or smaller may get converted to discrete " \ 2417 "scalar stores.") \ 2418 range(0, max_intx) \ 2419 constraint(InitArrayShortSizeConstraintFunc, AfterErgo) \ 2420 \ 2421 diagnostic(bool, CompilerDirectivesIgnoreCompileCommands, false, \ 2422 "Disable backwards compatibility for compile commands.") \ 2423 \ 2424 diagnostic(bool, CompilerDirectivesPrint, false, \ 2425 "Print compiler directives on installation.") \ 2426 diagnostic(int, CompilerDirectivesLimit, 50, \ 2427 "Limit on number of compiler directives.") \ 2428 \ 2429 product(ccstr, AllocateHeapAt, NULL, \ 2430 "Path to the directoy where a temporary file will be created " \ 2431 "to use as the backing store for Java Heap.") \ 2432 \ 2433 experimental(ccstr, AllocateOldGenAt, NULL, \ 2434 "Path to the directoy where a temporary file will be " \ 2435 "created to use as the backing store for old generation." \ 2436 "File of size Xmx is pre-allocated for performance reason, so" \ 2437 "we need that much space available") \ 2438 \ 2439 develop(int, VerifyMetaspaceInterval, DEBUG_ONLY(500) NOT_DEBUG(0), \ 2440 "Run periodic metaspace verifications (0 - none, " \ 2441 "1 - always, >1 every nth interval)") \ 2442 \ 2443 diagnostic(bool, ShowRegistersOnAssert, true, \ 2444 "On internal errors, include registers in error report.") \ 2445 \ 2446 diagnostic(bool, UseSwitchProfiling, true, \ 2447 "leverage profiling for table/lookup switch") \ 2448 \ 2449 develop(bool, TraceMemoryWriteback, false, \ 2450 "Trace memory writeback operations") \ 2451 \ 2452 JFR_ONLY(product(bool, FlightRecorder, false, \ 2453 "(Deprecated) Enable Flight Recorder")) \ 2454 \ 2455 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 2456 "Flight Recorder options")) \ 2457 \ 2458 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 2459 "Start flight recording with options")) \ 2460 \ 2461 experimental(bool, UseFastUnorderedTimeStamps, false, \ 2462 "Use platform unstable time where supported for timestamps only") 2463 2464 // Interface macros 2465 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2466 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 2467 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 2468 #define DECLARE_PD_DIAGNOSTIC_FLAG(type, name, doc) extern "C" type name; 2469 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 2470 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 2471 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 2472 #ifdef PRODUCT 2473 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 2474 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 2475 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) const type name = value; 2476 #else 2477 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 2478 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 2479 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2480 #endif // PRODUCT 2481 // Special LP64 flags, product only needed for now. 2482 #ifdef _LP64 2483 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 2484 #else 2485 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 2486 #endif // _LP64 2487 2488 ALL_FLAGS(DECLARE_DEVELOPER_FLAG, \ 2489 DECLARE_PD_DEVELOPER_FLAG, \ 2490 DECLARE_PRODUCT_FLAG, \ 2491 DECLARE_PD_PRODUCT_FLAG, \ 2492 DECLARE_DIAGNOSTIC_FLAG, \ 2493 DECLARE_PD_DIAGNOSTIC_FLAG, \ 2494 DECLARE_EXPERIMENTAL_FLAG, \ 2495 DECLARE_NOTPRODUCT_FLAG, \ 2496 DECLARE_MANAGEABLE_FLAG, \ 2497 DECLARE_PRODUCT_RW_FLAG, \ 2498 DECLARE_LP64_PRODUCT_FLAG, \ 2499 IGNORE_RANGE, \ 2500 IGNORE_CONSTRAINT, \ 2501 IGNORE_WRITEABLE) 2502 2503 #endif // SHARE_RUNTIME_GLOBALS_HPP