globals.hpp revision 4435:cd9ad42dfde0
1/* 2 * Copyright (c) 1997, 2013, 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_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_OS_FAMILY_linux 56# include "globals_linux.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_solaris 59# include "globals_solaris.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_windows 62# include "globals_windows.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_bsd 65# include "globals_bsd.hpp" 66#endif 67#ifdef TARGET_OS_ARCH_linux_x86 68# include "globals_linux_x86.hpp" 69#endif 70#ifdef TARGET_OS_ARCH_linux_sparc 71# include "globals_linux_sparc.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_zero 74# include "globals_linux_zero.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_solaris_x86 77# include "globals_solaris_x86.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_solaris_sparc 80# include "globals_solaris_sparc.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_windows_x86 83# include "globals_windows_x86.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_linux_arm 86# include "globals_linux_arm.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_linux_ppc 89# include "globals_linux_ppc.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_bsd_x86 92# include "globals_bsd_x86.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_bsd_zero 95# include "globals_bsd_zero.hpp" 96#endif 97#ifdef COMPILER1 98#ifdef TARGET_ARCH_x86 99# include "c1_globals_x86.hpp" 100#endif 101#ifdef TARGET_ARCH_sparc 102# include "c1_globals_sparc.hpp" 103#endif 104#ifdef TARGET_ARCH_arm 105# include "c1_globals_arm.hpp" 106#endif 107#ifdef TARGET_ARCH_ppc 108# include "c1_globals_ppc.hpp" 109#endif 110#ifdef TARGET_OS_FAMILY_linux 111# include "c1_globals_linux.hpp" 112#endif 113#ifdef TARGET_OS_FAMILY_solaris 114# include "c1_globals_solaris.hpp" 115#endif 116#ifdef TARGET_OS_FAMILY_windows 117# include "c1_globals_windows.hpp" 118#endif 119#ifdef TARGET_OS_FAMILY_bsd 120# include "c1_globals_bsd.hpp" 121#endif 122#endif 123#ifdef COMPILER2 124#ifdef TARGET_ARCH_x86 125# include "c2_globals_x86.hpp" 126#endif 127#ifdef TARGET_ARCH_sparc 128# include "c2_globals_sparc.hpp" 129#endif 130#ifdef TARGET_ARCH_arm 131# include "c2_globals_arm.hpp" 132#endif 133#ifdef TARGET_OS_FAMILY_linux 134# include "c2_globals_linux.hpp" 135#endif 136#ifdef TARGET_OS_FAMILY_solaris 137# include "c2_globals_solaris.hpp" 138#endif 139#ifdef TARGET_OS_FAMILY_windows 140# include "c2_globals_windows.hpp" 141#endif 142#ifdef TARGET_OS_FAMILY_bsd 143# include "c2_globals_bsd.hpp" 144#endif 145#endif 146#ifdef SHARK 147#ifdef TARGET_ARCH_zero 148# include "shark_globals_zero.hpp" 149#endif 150#endif 151 152#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 153define_pd_global(bool, BackgroundCompilation, false); 154define_pd_global(bool, UseTLAB, false); 155define_pd_global(bool, CICompileOSR, false); 156define_pd_global(bool, UseTypeProfile, false); 157define_pd_global(bool, UseOnStackReplacement, false); 158define_pd_global(bool, InlineIntrinsics, false); 159define_pd_global(bool, PreferInterpreterNativeStubs, true); 160define_pd_global(bool, ProfileInterpreter, false); 161define_pd_global(bool, ProfileTraps, false); 162define_pd_global(bool, TieredCompilation, false); 163 164define_pd_global(intx, CompileThreshold, 0); 165define_pd_global(intx, BackEdgeThreshold, 0); 166 167define_pd_global(intx, OnStackReplacePercentage, 0); 168define_pd_global(bool, ResizeTLAB, false); 169define_pd_global(intx, FreqInlineSize, 0); 170define_pd_global(intx, InlineSmallCode, 0); 171define_pd_global(intx, NewSizeThreadIncrease, 4*K); 172define_pd_global(intx, InlineClassNatives, true); 173define_pd_global(intx, InlineUnsafeOps, true); 174define_pd_global(intx, InitialCodeCacheSize, 160*K); 175define_pd_global(intx, ReservedCodeCacheSize, 32*M); 176define_pd_global(intx, CodeCacheExpansionSize, 32*K); 177define_pd_global(intx, CodeCacheMinBlockLength, 1); 178define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 179define_pd_global(bool, NeverActAsServerClassMachine, true); 180define_pd_global(uint64_t,MaxRAM, 1ULL*G); 181#define CI_COMPILER_COUNT 0 182#else 183 184#ifdef COMPILER2 185#define CI_COMPILER_COUNT 2 186#else 187#define CI_COMPILER_COUNT 1 188#endif // COMPILER2 189 190#endif // no compilers 191 192// string type aliases used only in this file 193typedef const char* ccstr; 194typedef const char* ccstrlist; // represents string arguments which accumulate 195 196enum FlagValueOrigin { 197 DEFAULT = 0, 198 COMMAND_LINE = 1, 199 ENVIRON_VAR = 2, 200 CONFIG_FILE = 3, 201 MANAGEMENT = 4, 202 ERGONOMIC = 5, 203 ATTACH_ON_DEMAND = 6, 204 INTERNAL = 99 205}; 206 207struct Flag { 208 const char *type; 209 const char *name; 210 void* addr; 211 212 NOT_PRODUCT(const char *doc;) 213 214 const char *kind; 215 FlagValueOrigin origin; 216 217 // points to all Flags static array 218 static Flag *flags; 219 220 // number of flags 221 static size_t numFlags; 222 223 static Flag* find_flag(char* name, size_t length, bool allow_locked = false); 224 225 bool is_bool() const { return strcmp(type, "bool") == 0; } 226 bool get_bool() const { return *((bool*) addr); } 227 void set_bool(bool value) { *((bool*) addr) = value; } 228 229 bool is_intx() const { return strcmp(type, "intx") == 0; } 230 intx get_intx() const { return *((intx*) addr); } 231 void set_intx(intx value) { *((intx*) addr) = value; } 232 233 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 234 uintx get_uintx() const { return *((uintx*) addr); } 235 void set_uintx(uintx value) { *((uintx*) addr) = value; } 236 237 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 238 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 239 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 240 241 bool is_double() const { return strcmp(type, "double") == 0; } 242 double get_double() const { return *((double*) addr); } 243 void set_double(double value) { *((double*) addr) = value; } 244 245 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 246 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 247 ccstr get_ccstr() const { return *((ccstr*) addr); } 248 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 249 250 bool is_unlocker() const; 251 bool is_unlocked() const; 252 bool is_writeable() const; 253 bool is_external() const; 254 255 bool is_unlocker_ext() const; 256 bool is_unlocked_ext() const; 257 bool is_writeable_ext() const; 258 bool is_external_ext() const; 259 260 void get_locked_message(char*, int) const; 261 void get_locked_message_ext(char*, int) const; 262 263 void print_on(outputStream* st, bool withComments = false ); 264 void print_as_flag(outputStream* st); 265}; 266 267// debug flags control various aspects of the VM and are global accessible 268 269// use FlagSetting to temporarily change some debug flag 270// e.g. FlagSetting fs(DebugThisAndThat, true); 271// restored to previous value upon leaving scope 272class FlagSetting { 273 bool val; 274 bool* flag; 275 public: 276 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 277 ~FlagSetting() { *flag = val; } 278}; 279 280 281class CounterSetting { 282 intx* counter; 283 public: 284 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 285 ~CounterSetting() { (*counter)--; } 286}; 287 288 289class IntFlagSetting { 290 intx val; 291 intx* flag; 292 public: 293 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 294 ~IntFlagSetting() { *flag = val; } 295}; 296 297 298class DoubleFlagSetting { 299 double val; 300 double* flag; 301 public: 302 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 303 ~DoubleFlagSetting() { *flag = val; } 304}; 305 306 307class CommandLineFlags { 308 public: 309 static bool boolAt(char* name, size_t len, bool* value); 310 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 311 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 312 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 313 314 static bool intxAt(char* name, size_t len, intx* value); 315 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 316 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 317 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 318 319 static bool uintxAt(char* name, size_t len, uintx* value); 320 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 321 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 322 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 323 324 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 325 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 326 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 327 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 328 329 static bool doubleAt(char* name, size_t len, double* value); 330 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 331 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 332 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 333 334 static bool ccstrAt(char* name, size_t len, ccstr* value); 335 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 336 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 337 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 338 339 // Returns false if name is not a command line flag. 340 static bool wasSetOnCmdline(const char* name, bool* value); 341 static void printSetFlags(outputStream* out); 342 343 static void printFlags(outputStream* out, bool withComments); 344 345 static void verify() PRODUCT_RETURN; 346}; 347 348// use this for flags that are true by default in the debug version but 349// false in the optimized version, and vice versa 350#ifdef ASSERT 351#define trueInDebug true 352#define falseInDebug false 353#else 354#define trueInDebug false 355#define falseInDebug true 356#endif 357 358// use this for flags that are true per default in the product build 359// but false in development builds, and vice versa 360#ifdef PRODUCT 361#define trueInProduct true 362#define falseInProduct false 363#else 364#define trueInProduct false 365#define falseInProduct true 366#endif 367 368#ifdef JAVASE_EMBEDDED 369#define falseInEmbedded false 370#else 371#define falseInEmbedded true 372#endif 373 374// develop flags are settable / visible only during development and are constant in the PRODUCT version 375// product flags are always settable / visible 376// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 377 378// A flag must be declared with one of the following types: 379// bool, intx, uintx, ccstr. 380// The type "ccstr" is an alias for "const char*" and is used 381// only in this file, because the macrology requires single-token type names. 382 383// Note: Diagnostic options not meant for VM tuning or for product modes. 384// They are to be used for VM quality assurance or field diagnosis 385// of VM bugs. They are hidden so that users will not be encouraged to 386// try them as if they were VM ordinary execution options. However, they 387// are available in the product version of the VM. Under instruction 388// from support engineers, VM customers can turn them on to collect 389// diagnostic information about VM problems. To use a VM diagnostic 390// option, you must first specify +UnlockDiagnosticVMOptions. 391// (This master switch also affects the behavior of -Xprintflags.) 392// 393// experimental flags are in support of features that are not 394// part of the officially supported product, but are available 395// for experimenting with. They could, for example, be performance 396// features that may not have undergone full or rigorous QA, but which may 397// help performance in some cases and released for experimentation 398// by the community of users and developers. This flag also allows one to 399// be able to build a fully supported product that nonetheless also 400// ships with some unsupported, lightly tested, experimental features. 401// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 402// UnlockExperimentalVMOptions flag, which allows the control and 403// modification of the experimental flags. 404// 405// Nota bene: neither diagnostic nor experimental options should be used casually, 406// and they are not supported on production loads, except under explicit 407// direction from support engineers. 408// 409// manageable flags are writeable external product flags. 410// They are dynamically writeable through the JDK management interface 411// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 412// These flags are external exported interface (see CCC). The list of 413// manageable flags can be queried programmatically through the management 414// interface. 415// 416// A flag can be made as "manageable" only if 417// - the flag is defined in a CCC as an external exported interface. 418// - the VM implementation supports dynamic setting of the flag. 419// This implies that the VM must *always* query the flag variable 420// and not reuse state related to the flag state at any given time. 421// - you want the flag to be queried programmatically by the customers. 422// 423// product_rw flags are writeable internal product flags. 424// They are like "manageable" flags but for internal/private use. 425// The list of product_rw flags are internal/private flags which 426// may be changed/removed in a future release. It can be set 427// through the management interface to get/set value 428// when the name of flag is supplied. 429// 430// A flag can be made as "product_rw" only if 431// - the VM implementation supports dynamic setting of the flag. 432// This implies that the VM must *always* query the flag variable 433// and not reuse state related to the flag state at any given time. 434// 435// Note that when there is a need to support develop flags to be writeable, 436// it can be done in the same way as product_rw. 437 438#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 439 \ 440 lp64_product(bool, UseCompressedOops, false, \ 441 "Use 32-bit object references in 64-bit VM " \ 442 "lp64_product means flag is always constant in 32 bit VM") \ 443 \ 444 lp64_product(bool, UseCompressedKlassPointers, false, \ 445 "Use 32-bit klass pointers in 64-bit VM " \ 446 "lp64_product means flag is always constant in 32 bit VM") \ 447 \ 448 notproduct(bool, CheckCompressedOops, true, \ 449 "generate checks in encoding/decoding code in debug VM") \ 450 \ 451 product_pd(uintx, HeapBaseMinAddress, \ 452 "OS specific low limit for heap base address") \ 453 \ 454 diagnostic(bool, PrintCompressedOopsMode, false, \ 455 "Print compressed oops base address and encoding mode") \ 456 \ 457 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 458 "Default object alignment in bytes, 8 is minimum") \ 459 \ 460 /* UseMembar is theoretically a temp flag used for memory barrier \ 461 * removal testing. It was supposed to be removed before FCS but has \ 462 * been re-added (see 6401008) */ \ 463 product_pd(bool, UseMembar, \ 464 "(Unstable) Issues membars on thread state transitions") \ 465 \ 466 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 467 * that don't support it. This will be replaced by processor detection \ 468 * logic. \ 469 */ \ 470 product(bool, UsePPCLWSYNC, true, \ 471 "Use lwsync instruction if true, else use slower sync") \ 472 \ 473 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 474 "Whether to clean the chunk pool asynchronously") \ 475 \ 476 /* Temporary: See 6948537 */ \ 477 experimental(bool, UseMemSetInBOT, true, \ 478 "(Unstable) uses memset in BOT updates in GC code") \ 479 \ 480 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 481 "Enable normal processing of flags relating to field diagnostics")\ 482 \ 483 experimental(bool, UnlockExperimentalVMOptions, false, \ 484 "Enable normal processing of flags relating to experimental features")\ 485 \ 486 product(bool, JavaMonitorsInStackTrace, true, \ 487 "Print info. about Java monitor locks when the stacks are dumped")\ 488 \ 489 product_pd(bool, UseLargePages, \ 490 "Use large page memory") \ 491 \ 492 product_pd(bool, UseLargePagesIndividualAllocation, \ 493 "Allocate large pages individually for better affinity") \ 494 \ 495 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 496 "Fail large pages individual allocation") \ 497 \ 498 develop(bool, TracePageSizes, false, \ 499 "Trace page size selection and usage.") \ 500 \ 501 product(bool, UseNUMA, false, \ 502 "Use NUMA if available") \ 503 \ 504 product(bool, UseNUMAInterleaving, false, \ 505 "Interleave memory across NUMA nodes if available") \ 506 \ 507 product(uintx, NUMAInterleaveGranularity, 2*M, \ 508 "Granularity to use for NUMA interleaving on Windows OS") \ 509 \ 510 product(bool, ForceNUMA, false, \ 511 "Force NUMA optimizations on single-node/UMA systems") \ 512 \ 513 product(intx, NUMAChunkResizeWeight, 20, \ 514 "Percentage (0-100) used to weight the current sample when " \ 515 "computing exponentially decaying average for " \ 516 "AdaptiveNUMAChunkSizing") \ 517 \ 518 product(intx, NUMASpaceResizeRate, 1*G, \ 519 "Do not reallocate more that this amount per collection") \ 520 \ 521 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 522 "Enable adaptive chunk sizing for NUMA") \ 523 \ 524 product(bool, NUMAStats, false, \ 525 "Print NUMA stats in detailed heap information") \ 526 \ 527 product(intx, NUMAPageScanRate, 256, \ 528 "Maximum number of pages to include in the page scan procedure") \ 529 \ 530 product_pd(bool, NeedsDeoptSuspend, \ 531 "True for register window machines (sparc/ia64)") \ 532 \ 533 product(intx, UseSSE, 99, \ 534 "Highest supported SSE instructions set on x86/x64") \ 535 \ 536 product(bool, UseAES, false, \ 537 "Control whether AES instructions can be used on x86/x64") \ 538 \ 539 product(uintx, LargePageSizeInBytes, 0, \ 540 "Large page size (0 to let VM choose the page size") \ 541 \ 542 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 543 "Use large pages if max heap is at least this big") \ 544 \ 545 product(bool, ForceTimeHighResolution, false, \ 546 "Using high time resolution(For Win32 only)") \ 547 \ 548 develop(bool, TraceItables, false, \ 549 "Trace initialization and use of itables") \ 550 \ 551 develop(bool, TracePcPatching, false, \ 552 "Trace usage of frame::patch_pc") \ 553 \ 554 develop(bool, TraceJumps, false, \ 555 "Trace assembly jumps in thread ring buffer") \ 556 \ 557 develop(bool, TraceRelocator, false, \ 558 "Trace the bytecode relocator") \ 559 \ 560 develop(bool, TraceLongCompiles, false, \ 561 "Print out every time compilation is longer than " \ 562 "a given threashold") \ 563 \ 564 develop(bool, SafepointALot, false, \ 565 "Generates a lot of safepoints. Works with " \ 566 "GuaranteedSafepointInterval") \ 567 \ 568 product_pd(bool, BackgroundCompilation, \ 569 "A thread requesting compilation is not blocked during " \ 570 "compilation") \ 571 \ 572 product(bool, PrintVMQWaitTime, false, \ 573 "Prints out the waiting time in VM operation queue") \ 574 \ 575 develop(bool, NoYieldsInMicrolock, false, \ 576 "Disable yields in microlock") \ 577 \ 578 develop(bool, TraceOopMapGeneration, false, \ 579 "Shows oopmap generation") \ 580 \ 581 product(bool, MethodFlushing, true, \ 582 "Reclamation of zombie and not-entrant methods") \ 583 \ 584 develop(bool, VerifyStack, false, \ 585 "Verify stack of each thread when it is entering a runtime call") \ 586 \ 587 diagnostic(bool, ForceUnreachable, false, \ 588 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 589 \ 590 notproduct(bool, StressDerivedPointers, false, \ 591 "Force scavenge when a derived pointers is detected on stack " \ 592 "after rtm call") \ 593 \ 594 develop(bool, TraceDerivedPointers, false, \ 595 "Trace traversal of derived pointers on stack") \ 596 \ 597 notproduct(bool, TraceCodeBlobStacks, false, \ 598 "Trace stack-walk of codeblobs") \ 599 \ 600 product(bool, PrintJNIResolving, false, \ 601 "Used to implement -v:jni") \ 602 \ 603 notproduct(bool, PrintRewrites, false, \ 604 "Print methods that are being rewritten") \ 605 \ 606 product(bool, UseInlineCaches, true, \ 607 "Use Inline Caches for virtual calls ") \ 608 \ 609 develop(bool, InlineArrayCopy, true, \ 610 "inline arraycopy native that is known to be part of " \ 611 "base library DLL") \ 612 \ 613 develop(bool, InlineObjectHash, true, \ 614 "inline Object::hashCode() native that is known to be part " \ 615 "of base library DLL") \ 616 \ 617 develop(bool, InlineNatives, true, \ 618 "inline natives that are known to be part of base library DLL") \ 619 \ 620 develop(bool, InlineMathNatives, true, \ 621 "inline SinD, CosD, etc.") \ 622 \ 623 develop(bool, InlineClassNatives, true, \ 624 "inline Class.isInstance, etc") \ 625 \ 626 develop(bool, InlineThreadNatives, true, \ 627 "inline Thread.currentThread, etc") \ 628 \ 629 develop(bool, InlineUnsafeOps, true, \ 630 "inline memory ops (native methods) from sun.misc.Unsafe") \ 631 \ 632 product(bool, CriticalJNINatives, true, \ 633 "check for critical JNI entry points") \ 634 \ 635 notproduct(bool, StressCriticalJNINatives, false, \ 636 "Exercise register saving code in critical natives") \ 637 \ 638 product(bool, UseSSE42Intrinsics, false, \ 639 "SSE4.2 versions of intrinsics") \ 640 \ 641 product(bool, UseAESIntrinsics, false, \ 642 "use intrinsics for AES versions of crypto") \ 643 \ 644 develop(bool, TraceCallFixup, false, \ 645 "traces all call fixups") \ 646 \ 647 develop(bool, DeoptimizeALot, false, \ 648 "deoptimize at every exit from the runtime system") \ 649 \ 650 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 651 "a comma separated list of bcis to deoptimize at") \ 652 \ 653 product(bool, DeoptimizeRandom, false, \ 654 "deoptimize random frames on random exit from the runtime system")\ 655 \ 656 notproduct(bool, ZombieALot, false, \ 657 "creates zombies (non-entrant) at exit from the runt. system") \ 658 \ 659 product(bool, UnlinkSymbolsALot, false, \ 660 "unlink unreferenced symbols from the symbol table at safepoints")\ 661 \ 662 notproduct(bool, WalkStackALot, false, \ 663 "trace stack (no print) at every exit from the runtime system") \ 664 \ 665 product(bool, Debugging, false, \ 666 "set when executing debug methods in debug.ccp " \ 667 "(to prevent triggering assertions)") \ 668 \ 669 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 670 "Enable strict checks that safepoints cannot happen for threads " \ 671 "that used No_Safepoint_Verifier") \ 672 \ 673 notproduct(bool, VerifyLastFrame, false, \ 674 "Verify oops on last frame on entry to VM") \ 675 \ 676 develop(bool, TraceHandleAllocation, false, \ 677 "Prints out warnings when suspicious many handles are allocated") \ 678 \ 679 product(bool, UseCompilerSafepoints, true, \ 680 "Stop at safepoints in compiled code") \ 681 \ 682 product(bool, FailOverToOldVerifier, true, \ 683 "fail over to old verifier when split verifier fails") \ 684 \ 685 develop(bool, ShowSafepointMsgs, false, \ 686 "Show msg. about safepoint synch.") \ 687 \ 688 product(bool, SafepointTimeout, false, \ 689 "Time out and warn or fail after SafepointTimeoutDelay " \ 690 "milliseconds if failed to reach safepoint") \ 691 \ 692 develop(bool, DieOnSafepointTimeout, false, \ 693 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 694 \ 695 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 696 /* typically, at most a few retries are needed */ \ 697 product(intx, SuspendRetryCount, 50, \ 698 "Maximum retry count for an external suspend request") \ 699 \ 700 product(intx, SuspendRetryDelay, 5, \ 701 "Milliseconds to delay per retry (* current_retry_count)") \ 702 \ 703 product(bool, AssertOnSuspendWaitFailure, false, \ 704 "Assert/Guarantee on external suspend wait failure") \ 705 \ 706 product(bool, TraceSuspendWaitFailures, false, \ 707 "Trace external suspend wait failures") \ 708 \ 709 product(bool, MaxFDLimit, true, \ 710 "Bump the number of file descriptors to max in solaris.") \ 711 \ 712 diagnostic(bool, LogEvents, true, \ 713 "Enable the various ring buffer event logs") \ 714 \ 715 diagnostic(intx, LogEventsBufferEntries, 10, \ 716 "Enable the various ring buffer event logs") \ 717 \ 718 product(bool, BytecodeVerificationRemote, true, \ 719 "Enables the Java bytecode verifier for remote classes") \ 720 \ 721 product(bool, BytecodeVerificationLocal, false, \ 722 "Enables the Java bytecode verifier for local classes") \ 723 \ 724 develop(bool, ForceFloatExceptions, trueInDebug, \ 725 "Force exceptions on FP stack under/overflow") \ 726 \ 727 develop(bool, VerifyStackAtCalls, false, \ 728 "Verify that the stack pointer is unchanged after calls") \ 729 \ 730 develop(bool, TraceJavaAssertions, false, \ 731 "Trace java language assertions") \ 732 \ 733 notproduct(bool, CheckAssertionStatusDirectives, false, \ 734 "temporary - see javaClasses.cpp") \ 735 \ 736 notproduct(bool, PrintMallocFree, false, \ 737 "Trace calls to C heap malloc/free allocation") \ 738 \ 739 product(bool, PrintOopAddress, false, \ 740 "Always print the location of the oop") \ 741 \ 742 notproduct(bool, VerifyCodeCacheOften, false, \ 743 "Verify compiled-code cache often") \ 744 \ 745 develop(bool, ZapDeadCompiledLocals, false, \ 746 "Zap dead locals in compiler frames") \ 747 \ 748 notproduct(bool, ZapDeadLocalsOld, false, \ 749 "Zap dead locals (old version, zaps all frames when " \ 750 "entering the VM") \ 751 \ 752 notproduct(bool, CheckOopishValues, false, \ 753 "Warn if value contains oop ( requires ZapDeadLocals)") \ 754 \ 755 develop(bool, UseMallocOnly, false, \ 756 "use only malloc/free for allocation (no resource area/arena)") \ 757 \ 758 develop(bool, PrintMalloc, false, \ 759 "print all malloc/free calls") \ 760 \ 761 develop(bool, PrintMallocStatistics, false, \ 762 "print malloc/free statistics") \ 763 \ 764 develop(bool, ZapResourceArea, trueInDebug, \ 765 "Zap freed resource/arena space with 0xABABABAB") \ 766 \ 767 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 768 "Zap freed VM handle space with 0xBCBCBCBC") \ 769 \ 770 develop(bool, ZapJNIHandleArea, trueInDebug, \ 771 "Zap freed JNI handle space with 0xFEFEFEFE") \ 772 \ 773 notproduct(bool, ZapStackSegments, trueInDebug, \ 774 "Zap allocated/freed Stack segments with 0xFADFADED") \ 775 \ 776 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 777 "Zap unused heap space with 0xBAADBABE") \ 778 \ 779 develop(bool, TraceZapUnusedHeapArea, false, \ 780 "Trace zapping of unused heap space") \ 781 \ 782 develop(bool, CheckZapUnusedHeapArea, false, \ 783 "Check zapping of unused heap space") \ 784 \ 785 develop(bool, ZapFillerObjects, trueInDebug, \ 786 "Zap filler objects with 0xDEAFBABE") \ 787 \ 788 develop(bool, PrintVMMessages, true, \ 789 "Print vm messages on console") \ 790 \ 791 product(bool, PrintGCApplicationConcurrentTime, false, \ 792 "Print the time the application has been running") \ 793 \ 794 product(bool, PrintGCApplicationStoppedTime, false, \ 795 "Print the time the application has been stopped") \ 796 \ 797 diagnostic(bool, VerboseVerification, false, \ 798 "Display detailed verification details") \ 799 \ 800 notproduct(uintx, ErrorHandlerTest, 0, \ 801 "If > 0, provokes an error after VM initialization; the value" \ 802 "determines which error to provoke. See test_error_handler()" \ 803 "in debug.cpp.") \ 804 \ 805 develop(bool, Verbose, false, \ 806 "Prints additional debugging information from other modes") \ 807 \ 808 develop(bool, PrintMiscellaneous, false, \ 809 "Prints uncategorized debugging information (requires +Verbose)") \ 810 \ 811 develop(bool, WizardMode, false, \ 812 "Prints much more debugging information") \ 813 \ 814 product(bool, ShowMessageBoxOnError, false, \ 815 "Keep process alive on VM fatal error") \ 816 \ 817 product(bool, CreateMinidumpOnCrash, false, \ 818 "Create minidump on VM fatal error") \ 819 \ 820 product_pd(bool, UseOSErrorReporting, \ 821 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 822 \ 823 product(bool, SuppressFatalErrorMessage, false, \ 824 "Do NO Fatal Error report [Avoid deadlock]") \ 825 \ 826 product(ccstrlist, OnError, "", \ 827 "Run user-defined commands on fatal error; see VMError.cpp " \ 828 "for examples") \ 829 \ 830 product(ccstrlist, OnOutOfMemoryError, "", \ 831 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 832 \ 833 manageable(bool, HeapDumpBeforeFullGC, false, \ 834 "Dump heap to file before any major stop-world GC") \ 835 \ 836 manageable(bool, HeapDumpAfterFullGC, false, \ 837 "Dump heap to file after any major stop-world GC") \ 838 \ 839 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 840 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 841 \ 842 manageable(ccstr, HeapDumpPath, NULL, \ 843 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 844 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 845 "in the working directory)") \ 846 \ 847 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 848 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 849 "when the heap usage is larger than this") \ 850 \ 851 develop(uintx, HeapDumpSegmentSize, 1*G, \ 852 "Approximate segment size when generating a segmented heap dump") \ 853 \ 854 develop(bool, BreakAtWarning, false, \ 855 "Execute breakpoint upon encountering VM warning") \ 856 \ 857 develop(bool, TraceVMOperation, false, \ 858 "Trace vm operations") \ 859 \ 860 develop(bool, UseFakeTimers, false, \ 861 "Tells whether the VM should use system time or a fake timer") \ 862 \ 863 product(ccstr, NativeMemoryTracking, "off", \ 864 "Native memory tracking options") \ 865 \ 866 diagnostic(bool, PrintNMTStatistics, false, \ 867 "Print native memory tracking summary data if it is on") \ 868 \ 869 diagnostic(bool, AutoShutdownNMT, true, \ 870 "Automatically shutdown native memory tracking under stress " \ 871 "situation. When set to false, native memory tracking tries to " \ 872 "stay alive at the expense of JVM performance") \ 873 \ 874 diagnostic(bool, LogCompilation, false, \ 875 "Log compilation activity in detail to hotspot.log or LogFile") \ 876 \ 877 product(bool, PrintCompilation, false, \ 878 "Print compilations") \ 879 \ 880 diagnostic(bool, TraceNMethodInstalls, false, \ 881 "Trace nmethod intallation") \ 882 \ 883 diagnostic(intx, ScavengeRootsInCode, 2, \ 884 "0: do not allow scavengable oops in the code cache; " \ 885 "1: allow scavenging from the code cache; " \ 886 "2: emit as many constants as the compiler can see") \ 887 \ 888 product(bool, AlwaysRestoreFPU, false, \ 889 "Restore the FPU control word after every JNI call (expensive)") \ 890 \ 891 diagnostic(bool, PrintCompilation2, false, \ 892 "Print additional statistics per compilation") \ 893 \ 894 diagnostic(bool, PrintAdapterHandlers, false, \ 895 "Print code generated for i2c/c2i adapters") \ 896 \ 897 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 898 "Verify that i2c/c2i adapters are called properly") \ 899 \ 900 develop(bool, VerifyAdapterSharing, false, \ 901 "Verify that the code for shared adapters is the equivalent") \ 902 \ 903 diagnostic(bool, PrintAssembly, false, \ 904 "Print assembly code (using external disassembler.so)") \ 905 \ 906 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 907 "Options string passed to disassembler.so") \ 908 \ 909 diagnostic(bool, PrintNMethods, false, \ 910 "Print assembly code for nmethods when generated") \ 911 \ 912 diagnostic(bool, PrintNativeNMethods, false, \ 913 "Print assembly code for native nmethods when generated") \ 914 \ 915 develop(bool, PrintDebugInfo, false, \ 916 "Print debug information for all nmethods when generated") \ 917 \ 918 develop(bool, PrintRelocations, false, \ 919 "Print relocation information for all nmethods when generated") \ 920 \ 921 develop(bool, PrintDependencies, false, \ 922 "Print dependency information for all nmethods when generated") \ 923 \ 924 develop(bool, PrintExceptionHandlers, false, \ 925 "Print exception handler tables for all nmethods when generated") \ 926 \ 927 develop(bool, StressCompiledExceptionHandlers, false, \ 928 "Exercise compiled exception handlers") \ 929 \ 930 develop(bool, InterceptOSException, false, \ 931 "Starts debugger when an implicit OS (e.g., NULL) " \ 932 "exception happens") \ 933 \ 934 product(bool, PrintCodeCache, false, \ 935 "Print the code cache memory usage when exiting") \ 936 \ 937 develop(bool, PrintCodeCache2, false, \ 938 "Print detailed usage info on the code cache when exiting") \ 939 \ 940 product(bool, PrintCodeCacheOnCompilation, false, \ 941 "Print the code cache memory usage each time a method is compiled") \ 942 \ 943 diagnostic(bool, PrintStubCode, false, \ 944 "Print generated stub code") \ 945 \ 946 product(bool, StackTraceInThrowable, true, \ 947 "Collect backtrace in throwable when exception happens") \ 948 \ 949 product(bool, OmitStackTraceInFastThrow, true, \ 950 "Omit backtraces for some 'hot' exceptions in optimized code") \ 951 \ 952 product(bool, ProfilerPrintByteCodeStatistics, false, \ 953 "Prints byte code statictics when dumping profiler output") \ 954 \ 955 product(bool, ProfilerRecordPC, false, \ 956 "Collects tick for each 16 byte interval of compiled code") \ 957 \ 958 product(bool, ProfileVM, false, \ 959 "Profiles ticks that fall within VM (either in the VM Thread " \ 960 "or VM code called through stubs)") \ 961 \ 962 product(bool, ProfileIntervals, false, \ 963 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 964 \ 965 notproduct(bool, ProfilerCheckIntervals, false, \ 966 "Collect and print info on spacing of profiler ticks") \ 967 \ 968 develop(bool, PrintJVMWarnings, false, \ 969 "Prints warnings for unimplemented JVM functions") \ 970 \ 971 product(bool, PrintWarnings, true, \ 972 "Prints JVM warnings to output stream") \ 973 \ 974 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 975 "Prints warnings for stalled SpinLocks") \ 976 \ 977 product(bool, RegisterFinalizersAtInit, true, \ 978 "Register finalizable objects at end of Object.<init> or " \ 979 "after allocation") \ 980 \ 981 develop(bool, RegisterReferences, true, \ 982 "Tells whether the VM should register soft/weak/final/phantom " \ 983 "references") \ 984 \ 985 develop(bool, IgnoreRewrites, false, \ 986 "Supress rewrites of bytecodes in the oopmap generator. " \ 987 "This is unsafe!") \ 988 \ 989 develop(bool, PrintCodeCacheExtension, false, \ 990 "Print extension of code cache") \ 991 \ 992 develop(bool, UsePrivilegedStack, true, \ 993 "Enable the security JVM functions") \ 994 \ 995 develop(bool, ProtectionDomainVerification, true, \ 996 "Verifies protection domain before resolution in system " \ 997 "dictionary") \ 998 \ 999 product(bool, ClassUnloading, true, \ 1000 "Do unloading of classes") \ 1001 \ 1002 develop(bool, DisableStartThread, false, \ 1003 "Disable starting of additional Java threads " \ 1004 "(for debugging only)") \ 1005 \ 1006 develop(bool, MemProfiling, false, \ 1007 "Write memory usage profiling to log file") \ 1008 \ 1009 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1010 "Prints the system dictionary at exit") \ 1011 \ 1012 experimental(intx, PredictedLoadedClassCount, 0, \ 1013 "Experimental: Tune loaded class cache starting size.") \ 1014 \ 1015 diagnostic(bool, UnsyncloadClass, false, \ 1016 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1017 "class loader must call VM synchronized for findClass " \ 1018 "and defineClass.") \ 1019 \ 1020 product(bool, AlwaysLockClassLoader, false, \ 1021 "Require the VM to acquire the class loader lock before calling " \ 1022 "loadClass() even for class loaders registering " \ 1023 "as parallel capable") \ 1024 \ 1025 product(bool, AllowParallelDefineClass, false, \ 1026 "Allow parallel defineClass requests for class loaders " \ 1027 "registering as parallel capable") \ 1028 \ 1029 product(bool, MustCallLoadClassInternal, false, \ 1030 "Call loadClassInternal() rather than loadClass()") \ 1031 \ 1032 product_pd(bool, DontYieldALot, \ 1033 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1034 \ 1035 product_pd(bool, ConvertSleepToYield, \ 1036 "Converts sleep(0) to thread yield " \ 1037 "(may be off for SOLARIS to improve GUI)") \ 1038 \ 1039 product(bool, ConvertYieldToSleep, false, \ 1040 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1041 "behavior (SOLARIS only)") \ 1042 \ 1043 product(bool, UseBoundThreads, true, \ 1044 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1045 \ 1046 develop(bool, UseDetachedThreads, true, \ 1047 "Use detached threads that are recycled upon termination " \ 1048 "(for SOLARIS only)") \ 1049 \ 1050 product(bool, UseLWPSynchronization, true, \ 1051 "Use LWP-based instead of libthread-based synchronization " \ 1052 "(SPARC only)") \ 1053 \ 1054 product(ccstr, SyncKnobs, NULL, \ 1055 "(Unstable) Various monitor synchronization tunables") \ 1056 \ 1057 product(intx, EmitSync, 0, \ 1058 "(Unsafe,Unstable) " \ 1059 " Controls emission of inline sync fast-path code") \ 1060 \ 1061 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1062 \ 1063 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1064 \ 1065 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1066 \ 1067 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1068 \ 1069 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1070 \ 1071 product(intx, hashCode, 5, \ 1072 "(Unstable) select hashCode generation algorithm" ) \ 1073 \ 1074 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1075 "(Unstable, Linux-specific)" \ 1076 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1077 \ 1078 product(bool, FilterSpuriousWakeups, true, \ 1079 "Prevent spurious or premature wakeups from object.wait " \ 1080 "(Solaris only)") \ 1081 \ 1082 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1083 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1084 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1085 \ 1086 develop(bool, UsePthreads, false, \ 1087 "Use pthread-based instead of libthread-based synchronization " \ 1088 "(SPARC only)") \ 1089 \ 1090 product(bool, AdjustConcurrency, false, \ 1091 "call thr_setconcurrency at thread create time to avoid " \ 1092 "LWP starvation on MP systems (For Solaris Only)") \ 1093 \ 1094 product(bool, ReduceSignalUsage, false, \ 1095 "Reduce the use of OS signals in Java and/or the VM") \ 1096 \ 1097 develop_pd(bool, ShareVtableStubs, \ 1098 "Share vtable stubs (smaller code but worse branch prediction") \ 1099 \ 1100 develop(bool, LoadLineNumberTables, true, \ 1101 "Tells whether the class file parser loads line number tables") \ 1102 \ 1103 develop(bool, LoadLocalVariableTables, true, \ 1104 "Tells whether the class file parser loads local variable tables")\ 1105 \ 1106 develop(bool, LoadLocalVariableTypeTables, true, \ 1107 "Tells whether the class file parser loads local variable type tables")\ 1108 \ 1109 product(bool, AllowUserSignalHandlers, false, \ 1110 "Do not complain if the application installs signal handlers " \ 1111 "(Solaris & Linux only)") \ 1112 \ 1113 product(bool, UseSignalChaining, true, \ 1114 "Use signal-chaining to invoke signal handlers installed " \ 1115 "by the application (Solaris & Linux only)") \ 1116 \ 1117 product(bool, UseAltSigs, false, \ 1118 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1119 "internal signals (Solaris only)") \ 1120 \ 1121 product(bool, AllowJNIEnvProxy, false, \ 1122 "Allow JNIEnv proxies for jdbx") \ 1123 \ 1124 product(bool, JNIDetachReleasesMonitors, true, \ 1125 "JNI DetachCurrentThread releases monitors owned by thread") \ 1126 \ 1127 product(bool, RestoreMXCSROnJNICalls, false, \ 1128 "Restore MXCSR when returning from JNI calls") \ 1129 \ 1130 product(bool, CheckJNICalls, false, \ 1131 "Verify all arguments to JNI calls") \ 1132 \ 1133 product(bool, UseFastJNIAccessors, true, \ 1134 "Use optimized versions of Get<Primitive>Field") \ 1135 \ 1136 product(bool, EagerXrunInit, false, \ 1137 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1138 " but not all -Xrun libraries may support the state of the VM at this time") \ 1139 \ 1140 product(bool, PreserveAllAnnotations, false, \ 1141 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1142 \ 1143 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1144 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1145 \ 1146 product(bool, LazyBootClassLoader, true, \ 1147 "Enable/disable lazy opening of boot class path entries") \ 1148 \ 1149 product(bool, UseXMMForArrayCopy, false, \ 1150 "Use SSE2 MOVQ instruction for Arraycopy") \ 1151 \ 1152 product(intx, FieldsAllocationStyle, 1, \ 1153 "0 - type based with oops first, 1 - with oops last, " \ 1154 "2 - oops in super and sub classes are together") \ 1155 \ 1156 product(bool, CompactFields, true, \ 1157 "Allocate nonstatic fields in gaps between previous fields") \ 1158 \ 1159 notproduct(bool, PrintCompactFieldsSavings, false, \ 1160 "Print how many words were saved with CompactFields") \ 1161 \ 1162 notproduct(bool, PrintFieldLayout, false, \ 1163 "Print field layout for each class") \ 1164 \ 1165 product(intx, ContendedPaddingWidth, 128, \ 1166 "How many bytes to pad the fields/classes marked @Contended with")\ 1167 \ 1168 product(bool, EnableContended, true, \ 1169 "Enable @Contended annotation support") \ 1170 \ 1171 product(bool, RestrictContended, true, \ 1172 "Restrict @Contended to trusted classes") \ 1173 \ 1174 product(bool, UseBiasedLocking, true, \ 1175 "Enable biased locking in JVM") \ 1176 \ 1177 product(intx, BiasedLockingStartupDelay, 4000, \ 1178 "Number of milliseconds to wait before enabling biased locking") \ 1179 \ 1180 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1181 "Print statistics of biased locking in JVM") \ 1182 \ 1183 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1184 "Threshold of number of revocations per type to try to " \ 1185 "rebias all objects in the heap of that type") \ 1186 \ 1187 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1188 "Threshold of number of revocations per type to permanently " \ 1189 "revoke biases of all objects in the heap of that type") \ 1190 \ 1191 product(intx, BiasedLockingDecayTime, 25000, \ 1192 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1193 "type after previous bulk rebias") \ 1194 \ 1195 /* tracing */ \ 1196 \ 1197 notproduct(bool, TraceRuntimeCalls, false, \ 1198 "Trace run-time calls") \ 1199 \ 1200 develop(bool, TraceJNICalls, false, \ 1201 "Trace JNI calls") \ 1202 \ 1203 notproduct(bool, TraceJVMCalls, false, \ 1204 "Trace JVM calls") \ 1205 \ 1206 product(ccstr, TraceJVMTI, NULL, \ 1207 "Trace flags for JVMTI functions and events") \ 1208 \ 1209 /* This option can change an EMCP method into an obsolete method. */ \ 1210 /* This can affect tests that except specific methods to be EMCP. */ \ 1211 /* This option should be used with caution. */ \ 1212 product(bool, StressLdcRewrite, false, \ 1213 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1214 \ 1215 product(intx, TraceRedefineClasses, 0, \ 1216 "Trace level for JVMTI RedefineClasses") \ 1217 \ 1218 develop(bool, StressMethodComparator, false, \ 1219 "run the MethodComparator on all loaded methods") \ 1220 \ 1221 /* change to false by default sometime after Mustang */ \ 1222 product(bool, VerifyMergedCPBytecodes, true, \ 1223 "Verify bytecodes after RedefineClasses constant pool merging") \ 1224 \ 1225 develop(bool, TraceJNIHandleAllocation, false, \ 1226 "Trace allocation/deallocation of JNI handle blocks") \ 1227 \ 1228 develop(bool, TraceThreadEvents, false, \ 1229 "Trace all thread events") \ 1230 \ 1231 develop(bool, TraceBytecodes, false, \ 1232 "Trace bytecode execution") \ 1233 \ 1234 develop(bool, TraceClassInitialization, false, \ 1235 "Trace class initialization") \ 1236 \ 1237 develop(bool, TraceExceptions, false, \ 1238 "Trace exceptions") \ 1239 \ 1240 develop(bool, TraceICs, false, \ 1241 "Trace inline cache changes") \ 1242 \ 1243 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1244 "Trace method invocation counter overflow") \ 1245 \ 1246 develop(bool, TraceInlineCacheClearing, false, \ 1247 "Trace clearing of inline caches in nmethods") \ 1248 \ 1249 develop(bool, TraceDependencies, false, \ 1250 "Trace dependencies") \ 1251 \ 1252 develop(bool, VerifyDependencies, trueInDebug, \ 1253 "Exercise and verify the compilation dependency mechanism") \ 1254 \ 1255 develop(bool, TraceNewOopMapGeneration, false, \ 1256 "Trace OopMapGeneration") \ 1257 \ 1258 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1259 "Trace OopMapGeneration: print detailed cell states") \ 1260 \ 1261 develop(bool, TimeOopMap, false, \ 1262 "Time calls to GenerateOopMap::compute_map() in sum") \ 1263 \ 1264 develop(bool, TimeOopMap2, false, \ 1265 "Time calls to GenerateOopMap::compute_map() individually") \ 1266 \ 1267 develop(bool, TraceMonitorMismatch, false, \ 1268 "Trace monitor matching failures during OopMapGeneration") \ 1269 \ 1270 develop(bool, TraceOopMapRewrites, false, \ 1271 "Trace rewritting of method oops during oop map generation") \ 1272 \ 1273 develop(bool, TraceSafepoint, false, \ 1274 "Trace safepoint operations") \ 1275 \ 1276 develop(bool, TraceICBuffer, false, \ 1277 "Trace usage of IC buffer") \ 1278 \ 1279 develop(bool, TraceCompiledIC, false, \ 1280 "Trace changes of compiled IC") \ 1281 \ 1282 notproduct(bool, TraceZapDeadLocals, false, \ 1283 "Trace zapping dead locals") \ 1284 \ 1285 develop(bool, TraceStartupTime, false, \ 1286 "Trace setup time") \ 1287 \ 1288 develop(bool, TraceProtectionDomainVerification, false, \ 1289 "Trace protection domain verifcation") \ 1290 \ 1291 develop(bool, TraceClearedExceptions, false, \ 1292 "Prints when an exception is forcibly cleared") \ 1293 \ 1294 product(bool, TraceClassResolution, false, \ 1295 "Trace all constant pool resolutions (for debugging)") \ 1296 \ 1297 product(bool, TraceBiasedLocking, false, \ 1298 "Trace biased locking in JVM") \ 1299 \ 1300 product(bool, TraceMonitorInflation, false, \ 1301 "Trace monitor inflation in JVM") \ 1302 \ 1303 /* gc */ \ 1304 \ 1305 product(bool, UseSerialGC, false, \ 1306 "Use the serial garbage collector") \ 1307 \ 1308 product(bool, UseG1GC, false, \ 1309 "Use the Garbage-First garbage collector") \ 1310 \ 1311 product(bool, UseParallelGC, false, \ 1312 "Use the Parallel Scavenge garbage collector") \ 1313 \ 1314 product(bool, UseParallelOldGC, false, \ 1315 "Use the Parallel Old garbage collector") \ 1316 \ 1317 product(uintx, HeapMaximumCompactionInterval, 20, \ 1318 "How often should we maximally compact the heap (not allowing " \ 1319 "any dead space)") \ 1320 \ 1321 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1322 "The collection count for the first maximum compaction") \ 1323 \ 1324 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1325 "In the Parallel Old garbage collector maximum compaction for " \ 1326 "a system GC") \ 1327 \ 1328 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1329 "The mean used by the par compact dead wood" \ 1330 "limiter (a number between 0-100).") \ 1331 \ 1332 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1333 "The standard deviation used by the par compact dead wood" \ 1334 "limiter (a number between 0-100).") \ 1335 \ 1336 product(uintx, ParallelGCThreads, 0, \ 1337 "Number of parallel threads parallel gc will use") \ 1338 \ 1339 product(bool, UseDynamicNumberOfGCThreads, false, \ 1340 "Dynamically choose the number of parallel threads " \ 1341 "parallel gc will use") \ 1342 \ 1343 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1344 "Force dynamic selection of the number of" \ 1345 "parallel threads parallel gc will use to aid debugging") \ 1346 \ 1347 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1348 "Size of heap (bytes) per GC thread used in calculating the " \ 1349 "number of GC threads") \ 1350 \ 1351 product(bool, TraceDynamicGCThreads, false, \ 1352 "Trace the dynamic GC thread usage") \ 1353 \ 1354 develop(bool, ParallelOldGCSplitALot, false, \ 1355 "Provoke splitting (copying data from a young gen space to" \ 1356 "multiple destination spaces)") \ 1357 \ 1358 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1359 "How often to provoke splitting a young gen space") \ 1360 \ 1361 product(uintx, ConcGCThreads, 0, \ 1362 "Number of threads concurrent gc will use") \ 1363 \ 1364 product(uintx, YoungPLABSize, 4096, \ 1365 "Size of young gen promotion labs (in HeapWords)") \ 1366 \ 1367 product(uintx, OldPLABSize, 1024, \ 1368 "Size of old gen promotion labs (in HeapWords)") \ 1369 \ 1370 product(uintx, GCTaskTimeStampEntries, 200, \ 1371 "Number of time stamp entries per gc worker thread") \ 1372 \ 1373 product(bool, AlwaysTenure, false, \ 1374 "Always tenure objects in eden. (ParallelGC only)") \ 1375 \ 1376 product(bool, NeverTenure, false, \ 1377 "Never tenure objects in eden, May tenure on overflow " \ 1378 "(ParallelGC only)") \ 1379 \ 1380 product(bool, ScavengeBeforeFullGC, true, \ 1381 "Scavenge youngest generation before each full GC, " \ 1382 "used with UseParallelGC") \ 1383 \ 1384 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1385 "Allow scavenges to occur when to_space contains objects.") \ 1386 \ 1387 product(bool, UseConcMarkSweepGC, false, \ 1388 "Use Concurrent Mark-Sweep GC in the old generation") \ 1389 \ 1390 product(bool, ExplicitGCInvokesConcurrent, false, \ 1391 "A System.gc() request invokes a concurrent collection;" \ 1392 " (effective only when UseConcMarkSweepGC)") \ 1393 \ 1394 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1395 "A System.gc() request invokes a concurrent collection and " \ 1396 "also unloads classes during such a concurrent gc cycle " \ 1397 "(effective only when UseConcMarkSweepGC)") \ 1398 \ 1399 product(bool, GCLockerInvokesConcurrent, false, \ 1400 "The exit of a JNI CS necessitating a scavenge also" \ 1401 " kicks off a bkgrd concurrent collection") \ 1402 \ 1403 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1404 "How much the GC can expand the eden by while the GC locker " \ 1405 "is active (as a percentage)") \ 1406 \ 1407 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1408 "Use Adaptive Free Lists in the CMS generation") \ 1409 \ 1410 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1411 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1412 \ 1413 develop(bool, RotateCMSCollectionTypes, false, \ 1414 "Rotate the CMS collections among concurrent and STW") \ 1415 \ 1416 product(bool, UseCMSBestFit, true, \ 1417 "Use CMS best fit allocation strategy") \ 1418 \ 1419 product(bool, UseCMSCollectionPassing, true, \ 1420 "Use passing of collection from background to foreground") \ 1421 \ 1422 product(bool, UseParNewGC, false, \ 1423 "Use parallel threads in the new generation.") \ 1424 \ 1425 product(bool, ParallelGCVerbose, false, \ 1426 "Verbose output for parallel GC.") \ 1427 \ 1428 product(intx, ParallelGCBufferWastePct, 10, \ 1429 "wasted fraction of parallel allocation buffer.") \ 1430 \ 1431 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1432 "Retain parallel allocation buffers across scavenges; " \ 1433 " -- disabled because this currently conflicts with " \ 1434 " parallel card scanning under certain conditions ") \ 1435 \ 1436 product(intx, TargetPLABWastePct, 10, \ 1437 "target wasted space in last buffer as pct of overall allocation")\ 1438 \ 1439 product(uintx, PLABWeight, 75, \ 1440 "Percentage (0-100) used to weight the current sample when" \ 1441 "computing exponentially decaying average for ResizePLAB.") \ 1442 \ 1443 product(bool, ResizePLAB, true, \ 1444 "Dynamically resize (survivor space) promotion labs") \ 1445 \ 1446 product(bool, PrintPLAB, false, \ 1447 "Print (survivor space) promotion labs sizing decisions") \ 1448 \ 1449 product(intx, ParGCArrayScanChunk, 50, \ 1450 "Scan a subset and push remainder, if array is bigger than this") \ 1451 \ 1452 product(bool, ParGCUseLocalOverflow, false, \ 1453 "Instead of a global overflow list, use local overflow stacks") \ 1454 \ 1455 product(bool, ParGCTrimOverflow, true, \ 1456 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1457 \ 1458 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1459 "Whether we should simulate work queue overflow in ParNew") \ 1460 \ 1461 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1462 "An `interval' counter that determines how frequently " \ 1463 "we simulate overflow; a smaller number increases frequency") \ 1464 \ 1465 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1466 "The desired number of objects to claim from the overflow list") \ 1467 \ 1468 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1469 "The number of strides per worker thread that we divide up the " \ 1470 "card table scanning work into") \ 1471 \ 1472 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1473 "The number of cards in each chunk of the parallel chunks used " \ 1474 "during card table scanning") \ 1475 \ 1476 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1477 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1478 "parallel GC.") \ 1479 \ 1480 product(uintx, OldPLABWeight, 50, \ 1481 "Percentage (0-100) used to weight the current sample when" \ 1482 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1483 \ 1484 product(bool, ResizeOldPLAB, true, \ 1485 "Dynamically resize (old gen) promotion labs") \ 1486 \ 1487 product(bool, PrintOldPLAB, false, \ 1488 "Print (old gen) promotion labs sizing decisions") \ 1489 \ 1490 product(uintx, CMSOldPLABMin, 16, \ 1491 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1492 \ 1493 product(uintx, CMSOldPLABMax, 1024, \ 1494 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1495 \ 1496 product(uintx, CMSOldPLABNumRefills, 4, \ 1497 "Nominal number of refills of CMS gen promotion lab cache" \ 1498 " per worker per block size") \ 1499 \ 1500 product(bool, CMSOldPLABResizeQuicker, false, \ 1501 "Whether to react on-the-fly during a scavenge to a sudden" \ 1502 " change in block demand rate") \ 1503 \ 1504 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1505 "The tolerance of the phase-change detector for on-the-fly" \ 1506 " PLAB resizing during a scavenge") \ 1507 \ 1508 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1509 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1510 " during a scavenge") \ 1511 \ 1512 product(bool, AlwaysPreTouch, false, \ 1513 "It forces all freshly committed pages to be pre-touched.") \ 1514 \ 1515 product_pd(intx, CMSYoungGenPerWorker, \ 1516 "The maximum size of young gen chosen by default per GC worker " \ 1517 "thread available") \ 1518 \ 1519 product(bool, CMSIncrementalMode, false, \ 1520 "Whether CMS GC should operate in \"incremental\" mode") \ 1521 \ 1522 product(uintx, CMSIncrementalDutyCycle, 10, \ 1523 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1524 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1525 "value") \ 1526 \ 1527 product(bool, CMSIncrementalPacing, true, \ 1528 "Whether the CMS incremental mode duty cycle should be " \ 1529 "automatically adjusted") \ 1530 \ 1531 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1532 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1533 "enabled (a percentage, 0-100)") \ 1534 \ 1535 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1536 "Percentage (0-100) used to add conservatism when computing the " \ 1537 "duty cycle") \ 1538 \ 1539 product(uintx, CMSIncrementalOffset, 0, \ 1540 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1541 " is shifted to the right within the period between young GCs") \ 1542 \ 1543 product(uintx, CMSExpAvgFactor, 50, \ 1544 "Percentage (0-100) used to weight the current sample when" \ 1545 "computing exponential averages for CMS statistics.") \ 1546 \ 1547 product(uintx, CMS_FLSWeight, 75, \ 1548 "Percentage (0-100) used to weight the current sample when" \ 1549 "computing exponentially decating averages for CMS FLS statistics.") \ 1550 \ 1551 product(uintx, CMS_FLSPadding, 1, \ 1552 "The multiple of deviation from mean to use for buffering" \ 1553 "against volatility in free list demand.") \ 1554 \ 1555 product(uintx, FLSCoalescePolicy, 2, \ 1556 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1557 \ 1558 product(bool, FLSAlwaysCoalesceLarge, false, \ 1559 "CMS: Larger free blocks are always available for coalescing") \ 1560 \ 1561 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1562 "CMS: the smaller the percentage the greater the coalition force")\ 1563 \ 1564 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1565 "CMS: the factor by which to inflate estimated demand of small" \ 1566 " block sizes to prevent coalescing with an adjoining block") \ 1567 \ 1568 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1569 "CMS: the factor by which to inflate estimated demand of large" \ 1570 " block sizes to prevent coalescing with an adjoining block") \ 1571 \ 1572 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1573 "CMS: the factor by which to inflate estimated demand of small" \ 1574 " block sizes to prevent splitting to supply demand for smaller" \ 1575 " blocks") \ 1576 \ 1577 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1578 "CMS: the factor by which to inflate estimated demand of large" \ 1579 " block sizes to prevent splitting to supply demand for smaller" \ 1580 " blocks") \ 1581 \ 1582 product(bool, CMSExtrapolateSweep, false, \ 1583 "CMS: cushion for block demand during sweep") \ 1584 \ 1585 product(uintx, CMS_SweepWeight, 75, \ 1586 "Percentage (0-100) used to weight the current sample when " \ 1587 "computing exponentially decaying average for inter-sweep " \ 1588 "duration") \ 1589 \ 1590 product(uintx, CMS_SweepPadding, 1, \ 1591 "The multiple of deviation from mean to use for buffering " \ 1592 "against volatility in inter-sweep duration.") \ 1593 \ 1594 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1595 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1596 "duration exceeds this threhold in milliseconds") \ 1597 \ 1598 develop(bool, CMSTraceIncrementalMode, false, \ 1599 "Trace CMS incremental mode") \ 1600 \ 1601 develop(bool, CMSTraceIncrementalPacing, false, \ 1602 "Trace CMS incremental mode pacing computation") \ 1603 \ 1604 develop(bool, CMSTraceThreadState, false, \ 1605 "Trace the CMS thread state (enable the trace_state() method)") \ 1606 \ 1607 product(bool, CMSClassUnloadingEnabled, true, \ 1608 "Whether class unloading enabled when using CMS GC") \ 1609 \ 1610 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1611 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1612 " for which classes may not be unloaded") \ 1613 \ 1614 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1615 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1616 \ 1617 product(bool, UseCMSCompactAtFullCollection, true, \ 1618 "Use mark sweep compact at full collections") \ 1619 \ 1620 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1621 "Number of CMS full collection done before compaction if > 0") \ 1622 \ 1623 develop(intx, CMSDictionaryChoice, 0, \ 1624 "Use BinaryTreeDictionary as default in the CMS generation") \ 1625 \ 1626 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1627 "Replenish an indexed free list with this number of chunks") \ 1628 \ 1629 product(bool, CMSReplenishIntermediate, true, \ 1630 "Replenish all intermediate free-list caches") \ 1631 \ 1632 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1633 "When satisfying batched demand, split blocks from the " \ 1634 "IndexedFreeList whose size is a multiple of requested size") \ 1635 \ 1636 product(bool, CMSLoopWarn, false, \ 1637 "Warn in case of excessive CMS looping") \ 1638 \ 1639 develop(bool, CMSOverflowEarlyRestoration, false, \ 1640 "Whether preserved marks should be restored early") \ 1641 \ 1642 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1643 "Size of marking stack") \ 1644 \ 1645 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1646 "Max size of marking stack") \ 1647 \ 1648 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1649 "Whether we should simulate frequent marking stack / work queue" \ 1650 " overflow") \ 1651 \ 1652 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1653 "An `interval' counter that determines how frequently" \ 1654 " we simulate overflow; a smaller number increases frequency") \ 1655 \ 1656 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1657 "(Temporary, subject to experimentation)" \ 1658 "Maximum number of abortable preclean iterations, if > 0") \ 1659 \ 1660 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1661 "(Temporary, subject to experimentation)" \ 1662 "Maximum time in abortable preclean in ms") \ 1663 \ 1664 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1665 "(Temporary, subject to experimentation)" \ 1666 "Nominal minimum work per abortable preclean iteration") \ 1667 \ 1668 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1669 "(Temporary, subject to experimentation)" \ 1670 " Time that we sleep between iterations when not given" \ 1671 " enough work per iteration") \ 1672 \ 1673 product(uintx, CMSRescanMultiple, 32, \ 1674 "Size (in cards) of CMS parallel rescan task") \ 1675 \ 1676 product(uintx, CMSConcMarkMultiple, 32, \ 1677 "Size (in cards) of CMS concurrent MT marking task") \ 1678 \ 1679 product(bool, CMSAbortSemantics, false, \ 1680 "Whether abort-on-overflow semantics is implemented") \ 1681 \ 1682 product(bool, CMSParallelRemarkEnabled, true, \ 1683 "Whether parallel remark enabled (only if ParNewGC)") \ 1684 \ 1685 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1686 "Whether parallel remark of survivor space" \ 1687 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1688 \ 1689 product(bool, CMSPLABRecordAlways, true, \ 1690 "Whether to always record survivor space PLAB bdries" \ 1691 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1692 \ 1693 product(bool, CMSConcurrentMTEnabled, true, \ 1694 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1695 \ 1696 product(bool, CMSPrecleaningEnabled, true, \ 1697 "Whether concurrent precleaning enabled") \ 1698 \ 1699 product(uintx, CMSPrecleanIter, 3, \ 1700 "Maximum number of precleaning iteration passes") \ 1701 \ 1702 product(uintx, CMSPrecleanNumerator, 2, \ 1703 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1704 " ratio") \ 1705 \ 1706 product(uintx, CMSPrecleanDenominator, 3, \ 1707 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1708 " ratio") \ 1709 \ 1710 product(bool, CMSPrecleanRefLists1, true, \ 1711 "Preclean ref lists during (initial) preclean phase") \ 1712 \ 1713 product(bool, CMSPrecleanRefLists2, false, \ 1714 "Preclean ref lists during abortable preclean phase") \ 1715 \ 1716 product(bool, CMSPrecleanSurvivors1, false, \ 1717 "Preclean survivors during (initial) preclean phase") \ 1718 \ 1719 product(bool, CMSPrecleanSurvivors2, true, \ 1720 "Preclean survivors during abortable preclean phase") \ 1721 \ 1722 product(uintx, CMSPrecleanThreshold, 1000, \ 1723 "Don't re-iterate if #dirty cards less than this") \ 1724 \ 1725 product(bool, CMSCleanOnEnter, true, \ 1726 "Clean-on-enter optimization for reducing number of dirty cards") \ 1727 \ 1728 product(uintx, CMSRemarkVerifyVariant, 1, \ 1729 "Choose variant (1,2) of verification following remark") \ 1730 \ 1731 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1732 "If Eden used is below this value, don't try to schedule remark") \ 1733 \ 1734 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1735 "The Eden occupancy % at which to try and schedule remark pause") \ 1736 \ 1737 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1738 "Start sampling Eden top at least before yg occupancy reaches" \ 1739 " 1/<ratio> of the size at which we plan to schedule remark") \ 1740 \ 1741 product(uintx, CMSSamplingGrain, 16*K, \ 1742 "The minimum distance between eden samples for CMS (see above)") \ 1743 \ 1744 product(bool, CMSScavengeBeforeRemark, false, \ 1745 "Attempt scavenge before the CMS remark step") \ 1746 \ 1747 develop(bool, CMSTraceSweeper, false, \ 1748 "Trace some actions of the CMS sweeper") \ 1749 \ 1750 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1751 "Don't drain below this size per parallel worker/thief") \ 1752 \ 1753 manageable(intx, CMSWaitDuration, 2000, \ 1754 "Time in milliseconds that CMS thread waits for young GC") \ 1755 \ 1756 develop(uintx, CMSCheckInterval, 1000, \ 1757 "Interval in milliseconds that CMS thread checks if it " \ 1758 "should start a collection cycle") \ 1759 \ 1760 product(bool, CMSYield, true, \ 1761 "Yield between steps of concurrent mark & sweep") \ 1762 \ 1763 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1764 "Bitmap operations should process at most this many bits" \ 1765 "between yields") \ 1766 \ 1767 product(bool, CMSDumpAtPromotionFailure, false, \ 1768 "Dump useful information about the state of the CMS old " \ 1769 " generation upon a promotion failure.") \ 1770 \ 1771 product(bool, CMSPrintChunksInDump, false, \ 1772 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1773 " more detailed information about the free chunks.") \ 1774 \ 1775 product(bool, CMSPrintObjectsInDump, false, \ 1776 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1777 " more detailed information about the allocated objects.") \ 1778 \ 1779 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1780 "Verify that all refs across the FLS boundary " \ 1781 " are to valid objects") \ 1782 \ 1783 diagnostic(bool, FLSVerifyLists, false, \ 1784 "Do lots of (expensive) FreeListSpace verification") \ 1785 \ 1786 diagnostic(bool, FLSVerifyIndexTable, false, \ 1787 "Do lots of (expensive) FLS index table verification") \ 1788 \ 1789 develop(bool, FLSVerifyDictionary, false, \ 1790 "Do lots of (expensive) FLS dictionary verification") \ 1791 \ 1792 develop(bool, VerifyBlockOffsetArray, false, \ 1793 "Do (expensive!) block offset array verification") \ 1794 \ 1795 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1796 "Maintain _unallocated_block in BlockOffsetArray" \ 1797 " (currently applicable only to CMS collector)") \ 1798 \ 1799 develop(bool, TraceCMSState, false, \ 1800 "Trace the state of the CMS collection") \ 1801 \ 1802 product(intx, RefDiscoveryPolicy, 0, \ 1803 "Whether reference-based(0) or referent-based(1)") \ 1804 \ 1805 product(bool, ParallelRefProcEnabled, false, \ 1806 "Enable parallel reference processing whenever possible") \ 1807 \ 1808 product(bool, ParallelRefProcBalancingEnabled, true, \ 1809 "Enable balancing of reference processing queues") \ 1810 \ 1811 product(uintx, CMSTriggerRatio, 80, \ 1812 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1813 "allocated before a CMS collection cycle commences") \ 1814 \ 1815 product(uintx, CMSBootstrapOccupancy, 50, \ 1816 "Percentage CMS generation occupancy at which to " \ 1817 "initiate CMS collection for bootstrapping collection stats") \ 1818 \ 1819 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1820 "Percentage CMS generation occupancy to start a CMS collection " \ 1821 "cycle. A negative value means that CMSTriggerRatio is used") \ 1822 \ 1823 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1824 "Percentage of the (entire) heap occupancy to start a " \ 1825 "concurrent GC cycle. It is used by GCs that trigger a " \ 1826 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1827 "not just one of the generations (e.g., G1). A value of 0 " \ 1828 "denotes 'do constant GC cycles'.") \ 1829 \ 1830 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1831 "Only use occupancy as a crierion for starting a CMS collection") \ 1832 \ 1833 product(intx, CMSIsTooFullPercentage, 98, \ 1834 "An absolute ceiling above which CMS will always consider the " \ 1835 "unloading of classes when class unloading is enabled") \ 1836 \ 1837 develop(bool, CMSTestInFreeList, false, \ 1838 "Check if the coalesced range is already in the " \ 1839 "free lists as claimed") \ 1840 \ 1841 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1842 "Check that all the garbage collected was returned to the " \ 1843 "free lists.") \ 1844 \ 1845 notproduct(bool, ScavengeALot, false, \ 1846 "Force scavenge at every Nth exit from the runtime system " \ 1847 "(N=ScavengeALotInterval)") \ 1848 \ 1849 develop(bool, FullGCALot, false, \ 1850 "Force full gc at every Nth exit from the runtime system " \ 1851 "(N=FullGCALotInterval)") \ 1852 \ 1853 notproduct(bool, GCALotAtAllSafepoints, false, \ 1854 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1855 \ 1856 product(bool, PrintPromotionFailure, false, \ 1857 "Print additional diagnostic information following " \ 1858 " promotion failure") \ 1859 \ 1860 notproduct(bool, PromotionFailureALot, false, \ 1861 "Use promotion failure handling on every youngest generation " \ 1862 "collection") \ 1863 \ 1864 develop(uintx, PromotionFailureALotCount, 1000, \ 1865 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1866 "refill attempts (ParNew) or promotion attempts " \ 1867 "(other young collectors) ") \ 1868 \ 1869 develop(uintx, PromotionFailureALotInterval, 5, \ 1870 "Total collections between promotion failures alot") \ 1871 \ 1872 experimental(intx, WorkStealingSleepMillis, 1, \ 1873 "Sleep time when sleep is used for yields") \ 1874 \ 1875 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1876 "Number of yields before a sleep is done during workstealing") \ 1877 \ 1878 experimental(uintx, WorkStealingHardSpins, 4096, \ 1879 "Number of iterations in a spin loop between checks on " \ 1880 "time out of hard spin") \ 1881 \ 1882 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1883 "Ratio of hard spins to calls to yield") \ 1884 \ 1885 develop(uintx, ObjArrayMarkingStride, 512, \ 1886 "Number of ObjArray elements to push onto the marking stack" \ 1887 "before pushing a continuation entry") \ 1888 \ 1889 develop(bool, MetadataAllocationFailALot, false, \ 1890 "Fail metadata allocations at intervals controlled by " \ 1891 "MetadataAllocationFailALotInterval") \ 1892 \ 1893 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1894 "metadata allocation failure alot interval") \ 1895 \ 1896 develop(bool, MetaDataDeallocateALot, false, \ 1897 "Deallocation bunches of metadata at intervals controlled by " \ 1898 "MetaDataAllocateALotInterval") \ 1899 \ 1900 develop(uintx, MetaDataDeallocateALotInterval, 100, \ 1901 "Metadata deallocation alot interval") \ 1902 \ 1903 develop(bool, TraceMetadataChunkAllocation, false, \ 1904 "Trace chunk metadata allocations") \ 1905 \ 1906 product(bool, TraceMetadataHumongousAllocation, false, \ 1907 "Trace humongous metadata allocations") \ 1908 \ 1909 develop(bool, TraceMetavirtualspaceAllocation, false, \ 1910 "Trace virtual space metadata allocations") \ 1911 \ 1912 notproduct(bool, ExecuteInternalVMTests, false, \ 1913 "Enable execution of internal VM tests.") \ 1914 \ 1915 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1916 \ 1917 product_pd(bool, ResizeTLAB, \ 1918 "Dynamically resize tlab size for threads") \ 1919 \ 1920 product(bool, ZeroTLAB, false, \ 1921 "Zero out the newly created TLAB") \ 1922 \ 1923 product(bool, FastTLABRefill, true, \ 1924 "Use fast TLAB refill code") \ 1925 \ 1926 product(bool, PrintTLAB, false, \ 1927 "Print various TLAB related information") \ 1928 \ 1929 product(bool, TLABStats, true, \ 1930 "Print various TLAB related information") \ 1931 \ 1932 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 1933 "Enable LowMemoryProtection")) \ 1934 \ 1935 product_pd(bool, NeverActAsServerClassMachine, \ 1936 "Never act like a server-class machine") \ 1937 \ 1938 product(bool, AlwaysActAsServerClassMachine, false, \ 1939 "Always act like a server-class machine") \ 1940 \ 1941 product_pd(uint64_t, MaxRAM, \ 1942 "Real memory size (in bytes) used to set maximum heap size") \ 1943 \ 1944 product(uintx, ErgoHeapSizeLimit, 0, \ 1945 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1946 "MaxRAM / MaxRAMFraction") \ 1947 \ 1948 product(uintx, MaxRAMFraction, 4, \ 1949 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1950 "size") \ 1951 \ 1952 product(uintx, DefaultMaxRAMFraction, 4, \ 1953 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1954 "size; deprecated: to be renamed to MaxRAMFraction") \ 1955 \ 1956 product(uintx, MinRAMFraction, 2, \ 1957 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1958 "size on systems with small physical memory size") \ 1959 \ 1960 product(uintx, InitialRAMFraction, 64, \ 1961 "Fraction (1/n) of real memory used for initial heap size") \ 1962 \ 1963 product(bool, UseAutoGCSelectPolicy, false, \ 1964 "Use automatic collection selection policy") \ 1965 \ 1966 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1967 "Automatic GC selection pause threshhold in ms") \ 1968 \ 1969 product(bool, UseAdaptiveSizePolicy, true, \ 1970 "Use adaptive generation sizing policies") \ 1971 \ 1972 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1973 "Use adaptive survivor sizing policies") \ 1974 \ 1975 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1976 "Use adaptive young-old sizing policies at minor collections") \ 1977 \ 1978 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1979 "Use adaptive young-old sizing policies at major collections") \ 1980 \ 1981 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1982 "Use statistics from System.GC for adaptive size policy") \ 1983 \ 1984 product(bool, UseAdaptiveGCBoundary, false, \ 1985 "Allow young-old boundary to move") \ 1986 \ 1987 develop(bool, TraceAdaptiveGCBoundary, false, \ 1988 "Trace young-old boundary moves") \ 1989 \ 1990 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1991 "Resize the virtual spaces of the young or old generations") \ 1992 \ 1993 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1994 "Policy for changeing generation size for throughput goals") \ 1995 \ 1996 product(uintx, AdaptiveSizePausePolicy, 0, \ 1997 "Policy for changing generation size for pause goals") \ 1998 \ 1999 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2000 "Adjust tenured generation to achive a minor pause goal") \ 2001 \ 2002 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2003 "Adjust young generation to achive a major pause goal") \ 2004 \ 2005 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2006 "Number of steps where heuristics is used before data is used") \ 2007 \ 2008 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2009 "Number of collections before the adaptive sizing is started") \ 2010 \ 2011 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2012 "Collecton interval for printing information; zero => never") \ 2013 \ 2014 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2015 "Use adaptive minimum footprint as a goal") \ 2016 \ 2017 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2018 "Weight given to exponential resizing, between 0 and 100") \ 2019 \ 2020 product(uintx, AdaptiveTimeWeight, 25, \ 2021 "Weight given to time in adaptive policy, between 0 and 100") \ 2022 \ 2023 product(uintx, PausePadding, 1, \ 2024 "How much buffer to keep for pause time") \ 2025 \ 2026 product(uintx, PromotedPadding, 3, \ 2027 "How much buffer to keep for promotion failure") \ 2028 \ 2029 product(uintx, SurvivorPadding, 3, \ 2030 "How much buffer to keep for survivor overflow") \ 2031 \ 2032 product(uintx, ThresholdTolerance, 10, \ 2033 "Allowed collection cost difference between generations") \ 2034 \ 2035 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2036 "If collection costs are within margin, reduce both by full " \ 2037 "delta") \ 2038 \ 2039 product(uintx, YoungGenerationSizeIncrement, 20, \ 2040 "Adaptive size percentage change in young generation") \ 2041 \ 2042 product(uintx, YoungGenerationSizeSupplement, 80, \ 2043 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2044 \ 2045 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2046 "Decay factor to YoungedGenerationSizeSupplement") \ 2047 \ 2048 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2049 "Adaptive size percentage change in tenured generation") \ 2050 \ 2051 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2052 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2053 \ 2054 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2055 "Decay factor to TenuredGenerationSizeIncrement") \ 2056 \ 2057 product(uintx, MaxGCPauseMillis, max_uintx, \ 2058 "Adaptive size policy maximum GC pause time goal in msec, " \ 2059 "or (G1 Only) the max. GC time per MMU time slice") \ 2060 \ 2061 product(uintx, GCPauseIntervalMillis, 0, \ 2062 "Time slice for MMU specification") \ 2063 \ 2064 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2065 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2066 \ 2067 product(uintx, GCTimeRatio, 99, \ 2068 "Adaptive size policy application time to GC time ratio") \ 2069 \ 2070 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2071 "Adaptive size scale down factor for shrinking") \ 2072 \ 2073 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2074 "Adaptive size decays the major cost for long major intervals") \ 2075 \ 2076 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2077 "Time scale over which major costs decay") \ 2078 \ 2079 product(uintx, MinSurvivorRatio, 3, \ 2080 "Minimum ratio of young generation/survivor space size") \ 2081 \ 2082 product(uintx, InitialSurvivorRatio, 8, \ 2083 "Initial ratio of eden/survivor space size") \ 2084 \ 2085 product(uintx, BaseFootPrintEstimate, 256*M, \ 2086 "Estimate of footprint other than Java Heap") \ 2087 \ 2088 product(bool, UseGCOverheadLimit, true, \ 2089 "Use policy to limit of proportion of time spent in GC " \ 2090 "before an OutOfMemory error is thrown") \ 2091 \ 2092 product(uintx, GCTimeLimit, 98, \ 2093 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2094 "error is thrown (used with GCHeapFreeLimit)") \ 2095 \ 2096 product(uintx, GCHeapFreeLimit, 2, \ 2097 "Minimum percentage of free space after a full GC before an " \ 2098 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2099 \ 2100 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2101 "Number of consecutive collections before gc time limit fires") \ 2102 \ 2103 product(bool, PrintAdaptiveSizePolicy, false, \ 2104 "Print information about AdaptiveSizePolicy") \ 2105 \ 2106 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2107 "How far ahead to prefetch destination area (<= 0 means off)") \ 2108 \ 2109 product(intx, PrefetchScanIntervalInBytes, -1, \ 2110 "How far ahead to prefetch scan area (<= 0 means off)") \ 2111 \ 2112 product(intx, PrefetchFieldsAhead, -1, \ 2113 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2114 \ 2115 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2116 "Verify system before exiting") \ 2117 \ 2118 diagnostic(bool, VerifyBeforeGC, false, \ 2119 "Verify memory system before GC") \ 2120 \ 2121 diagnostic(bool, VerifyAfterGC, false, \ 2122 "Verify memory system after GC") \ 2123 \ 2124 diagnostic(bool, VerifyDuringGC, false, \ 2125 "Verify memory system during GC (between phases)") \ 2126 \ 2127 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2128 "Enable parallel memory system verification") \ 2129 \ 2130 diagnostic(bool, DeferInitialCardMark, false, \ 2131 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2132 "may arise from new_pre_store_barrier") \ 2133 \ 2134 diagnostic(bool, VerifyRememberedSets, false, \ 2135 "Verify GC remembered sets") \ 2136 \ 2137 diagnostic(bool, VerifyObjectStartArray, true, \ 2138 "Verify GC object start array if verify before/after") \ 2139 \ 2140 product(bool, DisableExplicitGC, false, \ 2141 "Tells whether calling System.gc() does a full GC") \ 2142 \ 2143 notproduct(bool, CheckMemoryInitialization, false, \ 2144 "Checks memory initialization") \ 2145 \ 2146 product(bool, CollectGen0First, false, \ 2147 "Collect youngest generation before each full GC") \ 2148 \ 2149 diagnostic(bool, BindCMSThreadToCPU, false, \ 2150 "Bind CMS Thread to CPU if possible") \ 2151 \ 2152 diagnostic(uintx, CPUForCMSThread, 0, \ 2153 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2154 \ 2155 product(bool, BindGCTaskThreadsToCPUs, false, \ 2156 "Bind GCTaskThreads to CPUs if possible") \ 2157 \ 2158 product(bool, UseGCTaskAffinity, false, \ 2159 "Use worker affinity when asking for GCTasks") \ 2160 \ 2161 product(uintx, ProcessDistributionStride, 4, \ 2162 "Stride through processors when distributing processes") \ 2163 \ 2164 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2165 "number of times the coordinator GC thread will sleep while " \ 2166 "yielding before giving up and resuming GC") \ 2167 \ 2168 product(uintx, CMSYieldSleepCount, 0, \ 2169 "number of times a GC thread (minus the coordinator) " \ 2170 "will sleep while yielding before giving up and resuming GC") \ 2171 \ 2172 /* gc tracing */ \ 2173 manageable(bool, PrintGC, false, \ 2174 "Print message at garbage collect") \ 2175 \ 2176 manageable(bool, PrintGCDetails, false, \ 2177 "Print more details at garbage collect") \ 2178 \ 2179 manageable(bool, PrintGCDateStamps, false, \ 2180 "Print date stamps at garbage collect") \ 2181 \ 2182 manageable(bool, PrintGCTimeStamps, false, \ 2183 "Print timestamps at garbage collect") \ 2184 \ 2185 product(bool, PrintGCTaskTimeStamps, false, \ 2186 "Print timestamps for individual gc worker thread tasks") \ 2187 \ 2188 develop(intx, ConcGCYieldTimeout, 0, \ 2189 "If non-zero, assert that GC threads yield within this # of ms.") \ 2190 \ 2191 notproduct(bool, TraceMarkSweep, false, \ 2192 "Trace mark sweep") \ 2193 \ 2194 product(bool, PrintReferenceGC, false, \ 2195 "Print times spent handling reference objects during GC " \ 2196 " (enabled only when PrintGCDetails)") \ 2197 \ 2198 develop(bool, TraceReferenceGC, false, \ 2199 "Trace handling of soft/weak/final/phantom references") \ 2200 \ 2201 develop(bool, TraceFinalizerRegistration, false, \ 2202 "Trace registration of final references") \ 2203 \ 2204 notproduct(bool, TraceScavenge, false, \ 2205 "Trace scavenge") \ 2206 \ 2207 product_rw(bool, TraceClassLoading, false, \ 2208 "Trace all classes loaded") \ 2209 \ 2210 product(bool, TraceClassLoadingPreorder, false, \ 2211 "Trace all classes loaded in order referenced (not loaded)") \ 2212 \ 2213 product_rw(bool, TraceClassUnloading, false, \ 2214 "Trace unloading of classes") \ 2215 \ 2216 product_rw(bool, TraceLoaderConstraints, false, \ 2217 "Trace loader constraints") \ 2218 \ 2219 develop(bool, TraceClassLoaderData, false, \ 2220 "Trace class loader loader_data lifetime") \ 2221 \ 2222 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2223 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2224 "Initial size of the boot class loader data metaspace") \ 2225 \ 2226 product(bool, TraceGen0Time, false, \ 2227 "Trace accumulated time for Gen 0 collection") \ 2228 \ 2229 product(bool, TraceGen1Time, false, \ 2230 "Trace accumulated time for Gen 1 collection") \ 2231 \ 2232 product(bool, PrintTenuringDistribution, false, \ 2233 "Print tenuring age information") \ 2234 \ 2235 product_rw(bool, PrintHeapAtGC, false, \ 2236 "Print heap layout before and after each GC") \ 2237 \ 2238 product_rw(bool, PrintHeapAtGCExtended, false, \ 2239 "Prints extended information about the layout of the heap " \ 2240 "when -XX:+PrintHeapAtGC is set") \ 2241 \ 2242 product(bool, PrintHeapAtSIGBREAK, true, \ 2243 "Print heap layout in response to SIGBREAK") \ 2244 \ 2245 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2246 "Print a class histogram before any major stop-world GC") \ 2247 \ 2248 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2249 "Print a class histogram after any major stop-world GC") \ 2250 \ 2251 manageable(bool, PrintClassHistogram, false, \ 2252 "Print a histogram of class instances") \ 2253 \ 2254 develop(bool, TraceWorkGang, false, \ 2255 "Trace activities of work gangs") \ 2256 \ 2257 product(bool, TraceParallelOldGCTasks, false, \ 2258 "Trace multithreaded GC activity") \ 2259 \ 2260 develop(bool, TraceBlockOffsetTable, false, \ 2261 "Print BlockOffsetTable maps") \ 2262 \ 2263 develop(bool, TraceCardTableModRefBS, false, \ 2264 "Print CardTableModRefBS maps") \ 2265 \ 2266 develop(bool, TraceGCTaskManager, false, \ 2267 "Trace actions of the GC task manager") \ 2268 \ 2269 develop(bool, TraceGCTaskQueue, false, \ 2270 "Trace actions of the GC task queues") \ 2271 \ 2272 diagnostic(bool, TraceGCTaskThread, false, \ 2273 "Trace actions of the GC task threads") \ 2274 \ 2275 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2276 "Print the time taken by each parallel old gc phase." \ 2277 "PrintGCDetails must also be enabled.") \ 2278 \ 2279 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2280 "Trace parallel old gc marking phase") \ 2281 \ 2282 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2283 "Trace parallel old gc summary phase") \ 2284 \ 2285 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2286 "Trace parallel old gc compaction phase") \ 2287 \ 2288 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2289 "Trace parallel old gc dense prefix computation") \ 2290 \ 2291 develop(bool, IgnoreLibthreadGPFault, false, \ 2292 "Suppress workaround for libthread GP fault") \ 2293 \ 2294 product(bool, PrintJNIGCStalls, false, \ 2295 "Print diagnostic message when GC is stalled" \ 2296 "by JNI critical section") \ 2297 \ 2298 /* GC log rotation setting */ \ 2299 \ 2300 product(bool, UseGCLogFileRotation, false, \ 2301 "Prevent large gclog file for long running app. " \ 2302 "Requires -Xloggc:<filename>") \ 2303 \ 2304 product(uintx, NumberOfGCLogFiles, 0, \ 2305 "Number of gclog files in rotation, " \ 2306 "Default: 0, no rotation") \ 2307 \ 2308 product(uintx, GCLogFileSize, 0, \ 2309 "GC log file size, Default: 0 bytes, no rotation " \ 2310 "Only valid with UseGCLogFileRotation") \ 2311 \ 2312 /* JVMTI heap profiling */ \ 2313 \ 2314 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2315 "Trace JVMTI object tagging calls") \ 2316 \ 2317 diagnostic(bool, VerifyBeforeIteration, false, \ 2318 "Verify memory system before JVMTI iteration") \ 2319 \ 2320 /* compiler interface */ \ 2321 \ 2322 develop(bool, CIPrintCompilerName, false, \ 2323 "when CIPrint is active, print the name of the active compiler") \ 2324 \ 2325 develop(bool, CIPrintCompileQueue, false, \ 2326 "display the contents of the compile queue whenever a " \ 2327 "compilation is enqueued") \ 2328 \ 2329 develop(bool, CIPrintRequests, false, \ 2330 "display every request for compilation") \ 2331 \ 2332 product(bool, CITime, false, \ 2333 "collect timing information for compilation") \ 2334 \ 2335 develop(bool, CITimeEach, false, \ 2336 "display timing information after each successful compilation") \ 2337 \ 2338 develop(bool, CICountOSR, false, \ 2339 "use a separate counter when assigning ids to osr compilations") \ 2340 \ 2341 develop(bool, CICompileNatives, true, \ 2342 "compile native methods if supported by the compiler") \ 2343 \ 2344 develop_pd(bool, CICompileOSR, \ 2345 "compile on stack replacement methods if supported by the " \ 2346 "compiler") \ 2347 \ 2348 develop(bool, CIPrintMethodCodes, false, \ 2349 "print method bytecodes of the compiled code") \ 2350 \ 2351 develop(bool, CIPrintTypeFlow, false, \ 2352 "print the results of ciTypeFlow analysis") \ 2353 \ 2354 develop(bool, CITraceTypeFlow, false, \ 2355 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2356 \ 2357 develop(intx, OSROnlyBCI, -1, \ 2358 "OSR only at this bci. Negative values mean exclude that bci") \ 2359 \ 2360 /* compiler */ \ 2361 \ 2362 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2363 "Number of compiler threads to run") \ 2364 \ 2365 product(intx, CompilationPolicyChoice, 0, \ 2366 "which compilation policy (0/1)") \ 2367 \ 2368 develop(bool, UseStackBanging, true, \ 2369 "use stack banging for stack overflow checks (required for " \ 2370 "proper StackOverflow handling; disable only to measure cost " \ 2371 "of stackbanging)") \ 2372 \ 2373 develop(bool, UseStrictFP, true, \ 2374 "use strict fp if modifier strictfp is set") \ 2375 \ 2376 develop(bool, GenerateSynchronizationCode, true, \ 2377 "generate locking/unlocking code for synchronized methods and " \ 2378 "monitors") \ 2379 \ 2380 develop(bool, GenerateCompilerNullChecks, true, \ 2381 "Generate explicit null checks for loads/stores/calls") \ 2382 \ 2383 develop(bool, GenerateRangeChecks, true, \ 2384 "Generate range checks for array accesses") \ 2385 \ 2386 develop_pd(bool, ImplicitNullChecks, \ 2387 "generate code for implicit null checks") \ 2388 \ 2389 product(bool, PrintSafepointStatistics, false, \ 2390 "print statistics about safepoint synchronization") \ 2391 \ 2392 product(intx, PrintSafepointStatisticsCount, 300, \ 2393 "total number of safepoint statistics collected " \ 2394 "before printing them out") \ 2395 \ 2396 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2397 "print safepoint statistics only when safepoint takes" \ 2398 " more than PrintSafepointSatisticsTimeout in millis") \ 2399 \ 2400 product(bool, TraceSafepointCleanupTime, false, \ 2401 "print the break down of clean up tasks performed during" \ 2402 " safepoint") \ 2403 \ 2404 product(bool, Inline, true, \ 2405 "enable inlining") \ 2406 \ 2407 product(bool, ClipInlining, true, \ 2408 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2409 \ 2410 develop(bool, UseCHA, true, \ 2411 "enable CHA") \ 2412 \ 2413 product(bool, UseTypeProfile, true, \ 2414 "Check interpreter profile for historically monomorphic calls") \ 2415 \ 2416 notproduct(bool, TimeCompiler, false, \ 2417 "time the compiler") \ 2418 \ 2419 diagnostic(bool, PrintInlining, false, \ 2420 "prints inlining optimizations") \ 2421 \ 2422 product(bool, UsePopCountInstruction, false, \ 2423 "Use population count instruction") \ 2424 \ 2425 develop(bool, EagerInitialization, false, \ 2426 "Eagerly initialize classes if possible") \ 2427 \ 2428 develop(bool, TraceMethodReplacement, false, \ 2429 "Print when methods are replaced do to recompilation") \ 2430 \ 2431 develop(bool, PrintMethodFlushing, false, \ 2432 "print the nmethods being flushed") \ 2433 \ 2434 develop(bool, UseRelocIndex, false, \ 2435 "use an index to speed random access to relocations") \ 2436 \ 2437 develop(bool, StressCodeBuffers, false, \ 2438 "Exercise code buffer expansion and other rare state changes") \ 2439 \ 2440 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2441 "Generate extra debugging info for non-safepoints in nmethods") \ 2442 \ 2443 product(bool, PrintVMOptions, false, \ 2444 "Print flags that appeared on the command line") \ 2445 \ 2446 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2447 "Ignore unrecognized VM options") \ 2448 \ 2449 product(bool, PrintCommandLineFlags, false, \ 2450 "Print flags specified on command line or set by ergonomics") \ 2451 \ 2452 product(bool, PrintFlagsInitial, false, \ 2453 "Print all VM flags before argument processing and exit VM") \ 2454 \ 2455 product(bool, PrintFlagsFinal, false, \ 2456 "Print all VM flags after argument and ergonomic processing") \ 2457 \ 2458 notproduct(bool, PrintFlagsWithComments, false, \ 2459 "Print all VM flags with default values and descriptions and exit")\ 2460 \ 2461 diagnostic(bool, SerializeVMOutput, true, \ 2462 "Use a mutex to serialize output to tty and hotspot.log") \ 2463 \ 2464 diagnostic(bool, DisplayVMOutput, true, \ 2465 "Display all VM output on the tty, independently of LogVMOutput") \ 2466 \ 2467 diagnostic(bool, LogVMOutput, trueInDebug, \ 2468 "Save VM output to hotspot.log, or to LogFile") \ 2469 \ 2470 diagnostic(ccstr, LogFile, NULL, \ 2471 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2472 \ 2473 product(ccstr, ErrorFile, NULL, \ 2474 "If an error occurs, save the error data to this file " \ 2475 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2476 \ 2477 product(bool, DisplayVMOutputToStderr, false, \ 2478 "If DisplayVMOutput is true, display all VM output to stderr") \ 2479 \ 2480 product(bool, DisplayVMOutputToStdout, false, \ 2481 "If DisplayVMOutput is true, display all VM output to stdout") \ 2482 \ 2483 product(bool, UseHeavyMonitors, false, \ 2484 "use heavyweight instead of lightweight Java monitors") \ 2485 \ 2486 product(bool, PrintStringTableStatistics, false, \ 2487 "print statistics about the StringTable and SymbolTable") \ 2488 \ 2489 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2490 "print histogram of the symbol table") \ 2491 \ 2492 notproduct(bool, ExitVMOnVerifyError, false, \ 2493 "standard exit from VM if bytecode verify error " \ 2494 "(only in debug mode)") \ 2495 \ 2496 notproduct(ccstr, AbortVMOnException, NULL, \ 2497 "Call fatal if this exception is thrown. Example: " \ 2498 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2499 \ 2500 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2501 "Call fatal if the exception pointed by AbortVMOnException " \ 2502 "has this message.") \ 2503 \ 2504 develop(bool, DebugVtables, false, \ 2505 "add debugging code to vtable dispatch") \ 2506 \ 2507 develop(bool, PrintVtables, false, \ 2508 "print vtables when printing klass") \ 2509 \ 2510 notproduct(bool, PrintVtableStats, false, \ 2511 "print vtables stats at end of run") \ 2512 \ 2513 develop(bool, TraceCreateZombies, false, \ 2514 "trace creation of zombie nmethods") \ 2515 \ 2516 notproduct(bool, IgnoreLockingAssertions, false, \ 2517 "disable locking assertions (for speed)") \ 2518 \ 2519 product(bool, RangeCheckElimination, true, \ 2520 "Eliminate range checks") \ 2521 \ 2522 develop_pd(bool, UncommonNullCast, \ 2523 "track occurrences of null in casts; adjust compiler tactics") \ 2524 \ 2525 develop(bool, TypeProfileCasts, true, \ 2526 "treat casts like calls for purposes of type profiling") \ 2527 \ 2528 develop(bool, DelayCompilationDuringStartup, true, \ 2529 "Delay invoking the compiler until main application class is " \ 2530 "loaded") \ 2531 \ 2532 develop(bool, CompileTheWorld, false, \ 2533 "Compile all methods in all classes in bootstrap class path " \ 2534 "(stress test)") \ 2535 \ 2536 develop(bool, CompileTheWorldPreloadClasses, true, \ 2537 "Preload all classes used by a class before start loading") \ 2538 \ 2539 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2540 "Force a safepoint every n compiles so sweeper can keep up") \ 2541 \ 2542 develop(bool, FillDelaySlots, true, \ 2543 "Fill delay slots (on SPARC only)") \ 2544 \ 2545 develop(bool, TimeLivenessAnalysis, false, \ 2546 "Time computation of bytecode liveness analysis") \ 2547 \ 2548 develop(bool, TraceLivenessGen, false, \ 2549 "Trace the generation of liveness analysis information") \ 2550 \ 2551 notproduct(bool, TraceLivenessQuery, false, \ 2552 "Trace queries of liveness analysis information") \ 2553 \ 2554 notproduct(bool, CollectIndexSetStatistics, false, \ 2555 "Collect information about IndexSets") \ 2556 \ 2557 develop(bool, UseLoopSafepoints, true, \ 2558 "Generate Safepoint nodes in every loop") \ 2559 \ 2560 develop(intx, FastAllocateSizeLimit, 128*K, \ 2561 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2562 "Inline allocations larger than this in doublewords must go slow")\ 2563 \ 2564 product(bool, AggressiveOpts, false, \ 2565 "Enable aggressive optimizations - see arguments.cpp") \ 2566 \ 2567 product(bool, UseStringCache, false, \ 2568 "Enable String cache capabilities on String.java") \ 2569 \ 2570 /* statistics */ \ 2571 develop(bool, CountCompiledCalls, false, \ 2572 "counts method invocations") \ 2573 \ 2574 notproduct(bool, CountRuntimeCalls, false, \ 2575 "counts VM runtime calls") \ 2576 \ 2577 develop(bool, CountJNICalls, false, \ 2578 "counts jni method invocations") \ 2579 \ 2580 notproduct(bool, CountJVMCalls, false, \ 2581 "counts jvm method invocations") \ 2582 \ 2583 notproduct(bool, CountRemovableExceptions, false, \ 2584 "count exceptions that could be replaced by branches due to " \ 2585 "inlining") \ 2586 \ 2587 notproduct(bool, ICMissHistogram, false, \ 2588 "produce histogram of IC misses") \ 2589 \ 2590 notproduct(bool, PrintClassStatistics, false, \ 2591 "prints class statistics at end of run") \ 2592 \ 2593 notproduct(bool, PrintMethodStatistics, false, \ 2594 "prints method statistics at end of run") \ 2595 \ 2596 /* interpreter */ \ 2597 develop(bool, ClearInterpreterLocals, false, \ 2598 "Always clear local variables of interpreter activations upon " \ 2599 "entry") \ 2600 \ 2601 product_pd(bool, RewriteBytecodes, \ 2602 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2603 \ 2604 product_pd(bool, RewriteFrequentPairs, \ 2605 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2606 \ 2607 diagnostic(bool, PrintInterpreter, false, \ 2608 "Prints the generated interpreter code") \ 2609 \ 2610 product(bool, UseInterpreter, true, \ 2611 "Use interpreter for non-compiled methods") \ 2612 \ 2613 develop(bool, UseFastSignatureHandlers, true, \ 2614 "Use fast signature handlers for native calls") \ 2615 \ 2616 product(bool, UseLoopCounter, true, \ 2617 "Increment invocation counter on backward branch") \ 2618 \ 2619 product(bool, UseFastEmptyMethods, true, \ 2620 "Use fast method entry code for empty methods") \ 2621 \ 2622 product(bool, UseFastAccessorMethods, true, \ 2623 "Use fast method entry code for accessor methods") \ 2624 \ 2625 product_pd(bool, UseOnStackReplacement, \ 2626 "Use on stack replacement, calls runtime if invoc. counter " \ 2627 "overflows in loop") \ 2628 \ 2629 notproduct(bool, TraceOnStackReplacement, false, \ 2630 "Trace on stack replacement") \ 2631 \ 2632 product_pd(bool, PreferInterpreterNativeStubs, \ 2633 "Use always interpreter stubs for native methods invoked via " \ 2634 "interpreter") \ 2635 \ 2636 develop(bool, CountBytecodes, false, \ 2637 "Count number of bytecodes executed") \ 2638 \ 2639 develop(bool, PrintBytecodeHistogram, false, \ 2640 "Print histogram of the executed bytecodes") \ 2641 \ 2642 develop(bool, PrintBytecodePairHistogram, false, \ 2643 "Print histogram of the executed bytecode pairs") \ 2644 \ 2645 diagnostic(bool, PrintSignatureHandlers, false, \ 2646 "Print code generated for native method signature handlers") \ 2647 \ 2648 develop(bool, VerifyOops, false, \ 2649 "Do plausibility checks for oops") \ 2650 \ 2651 develop(bool, CheckUnhandledOops, false, \ 2652 "Check for unhandled oops in VM code") \ 2653 \ 2654 develop(bool, VerifyJNIFields, trueInDebug, \ 2655 "Verify jfieldIDs for instance fields") \ 2656 \ 2657 notproduct(bool, VerifyJNIEnvThread, false, \ 2658 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2659 "from JNI") \ 2660 \ 2661 develop(bool, VerifyFPU, false, \ 2662 "Verify FPU state (check for NaN's, etc.)") \ 2663 \ 2664 develop(bool, VerifyThread, false, \ 2665 "Watch the thread register for corruption (SPARC only)") \ 2666 \ 2667 develop(bool, VerifyActivationFrameSize, false, \ 2668 "Verify that activation frame didn't become smaller than its " \ 2669 "minimal size") \ 2670 \ 2671 develop(bool, TraceFrequencyInlining, false, \ 2672 "Trace frequency based inlining") \ 2673 \ 2674 develop_pd(bool, InlineIntrinsics, \ 2675 "Inline intrinsics that can be statically resolved") \ 2676 \ 2677 product_pd(bool, ProfileInterpreter, \ 2678 "Profile at the bytecode level during interpretation") \ 2679 \ 2680 develop_pd(bool, ProfileTraps, \ 2681 "Profile deoptimization traps at the bytecode level") \ 2682 \ 2683 product(intx, ProfileMaturityPercentage, 20, \ 2684 "number of method invocations/branches (expressed as % of " \ 2685 "CompileThreshold) before using the method's profile") \ 2686 \ 2687 develop(bool, PrintMethodData, false, \ 2688 "Print the results of +ProfileInterpreter at end of run") \ 2689 \ 2690 develop(bool, VerifyDataPointer, trueInDebug, \ 2691 "Verify the method data pointer during interpreter profiling") \ 2692 \ 2693 develop(bool, VerifyCompiledCode, false, \ 2694 "Include miscellaneous runtime verifications in nmethod code; " \ 2695 "default off because it disturbs nmethod size heuristics") \ 2696 \ 2697 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2698 "Manually make GC thread crash then dump java stack trace; " \ 2699 "Test only") \ 2700 \ 2701 /* compilation */ \ 2702 product(bool, UseCompiler, true, \ 2703 "use compilation") \ 2704 \ 2705 develop(bool, TraceCompilationPolicy, false, \ 2706 "Trace compilation policy") \ 2707 \ 2708 develop(bool, TimeCompilationPolicy, false, \ 2709 "Time the compilation policy") \ 2710 \ 2711 product(bool, UseCounterDecay, true, \ 2712 "adjust recompilation counters") \ 2713 \ 2714 develop(intx, CounterHalfLifeTime, 30, \ 2715 "half-life time of invocation counters (in secs)") \ 2716 \ 2717 develop(intx, CounterDecayMinIntervalLength, 500, \ 2718 "Min. ms. between invocation of CounterDecay") \ 2719 \ 2720 product(bool, AlwaysCompileLoopMethods, false, \ 2721 "when using recompilation, never interpret methods " \ 2722 "containing loops") \ 2723 \ 2724 product(bool, DontCompileHugeMethods, true, \ 2725 "don't compile methods > HugeMethodLimit") \ 2726 \ 2727 /* Bytecode escape analysis estimation. */ \ 2728 product(bool, EstimateArgEscape, true, \ 2729 "Analyze bytecodes to estimate escape state of arguments") \ 2730 \ 2731 product(intx, BCEATraceLevel, 0, \ 2732 "How much tracing to do of bytecode escape analysis estimates") \ 2733 \ 2734 product(intx, MaxBCEAEstimateLevel, 5, \ 2735 "Maximum number of nested calls that are analyzed by BC EA.") \ 2736 \ 2737 product(intx, MaxBCEAEstimateSize, 150, \ 2738 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2739 \ 2740 product(intx, AllocatePrefetchStyle, 1, \ 2741 "0 = no prefetch, " \ 2742 "1 = prefetch instructions for each allocation, " \ 2743 "2 = use TLAB watermark to gate allocation prefetch, " \ 2744 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2745 \ 2746 product(intx, AllocatePrefetchDistance, -1, \ 2747 "Distance to prefetch ahead of allocation pointer") \ 2748 \ 2749 product(intx, AllocatePrefetchLines, 3, \ 2750 "Number of lines to prefetch ahead of array allocation pointer") \ 2751 \ 2752 product(intx, AllocateInstancePrefetchLines, 1, \ 2753 "Number of lines to prefetch ahead of instance allocation pointer") \ 2754 \ 2755 product(intx, AllocatePrefetchStepSize, 16, \ 2756 "Step size in bytes of sequential prefetch instructions") \ 2757 \ 2758 product(intx, AllocatePrefetchInstr, 0, \ 2759 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2760 \ 2761 /* deoptimization */ \ 2762 develop(bool, TraceDeoptimization, false, \ 2763 "Trace deoptimization") \ 2764 \ 2765 develop(bool, DebugDeoptimization, false, \ 2766 "Tracing various information while debugging deoptimization") \ 2767 \ 2768 product(intx, SelfDestructTimer, 0, \ 2769 "Will cause VM to terminate after a given time (in minutes) " \ 2770 "(0 means off)") \ 2771 \ 2772 product(intx, MaxJavaStackTraceDepth, 1024, \ 2773 "Max. no. of lines in the stack trace for Java exceptions " \ 2774 "(0 means all)") \ 2775 \ 2776 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2777 "Guarantee a safepoint (at least) every so many milliseconds " \ 2778 "(0 means none)")) \ 2779 \ 2780 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2781 "Guarantee a safepoint (at least) every so many milliseconds " \ 2782 "(0 means none)")) \ 2783 \ 2784 product(intx, SafepointTimeoutDelay, 10000, \ 2785 "Delay in milliseconds for option SafepointTimeout") \ 2786 \ 2787 product(intx, NmethodSweepFraction, 16, \ 2788 "Number of invocations of sweeper to cover all nmethods") \ 2789 \ 2790 product(intx, NmethodSweepCheckInterval, 5, \ 2791 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2792 \ 2793 notproduct(bool, LogSweeper, false, \ 2794 "Keep a ring buffer of sweeper activity") \ 2795 \ 2796 notproduct(intx, SweeperLogEntries, 1024, \ 2797 "Number of records in the ring buffer of sweeper activity") \ 2798 \ 2799 notproduct(intx, MemProfilingInterval, 500, \ 2800 "Time between each invocation of the MemProfiler") \ 2801 \ 2802 develop(intx, MallocCatchPtr, -1, \ 2803 "Hit breakpoint when mallocing/freeing this pointer") \ 2804 \ 2805 notproduct(intx, AssertRepeat, 1, \ 2806 "number of times to evaluate expression in assert " \ 2807 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2808 \ 2809 notproduct(ccstrlist, SuppressErrorAt, "", \ 2810 "List of assertions (file:line) to muzzle") \ 2811 \ 2812 notproduct(uintx, HandleAllocationLimit, 1024, \ 2813 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2814 "is used") \ 2815 \ 2816 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2817 "Threshold for total handle allocation when " \ 2818 "+TraceHandleAllocation is used") \ 2819 \ 2820 develop(intx, StackPrintLimit, 100, \ 2821 "number of stack frames to print in VM-level stack dump") \ 2822 \ 2823 notproduct(intx, MaxElementPrintSize, 256, \ 2824 "maximum number of elements to print") \ 2825 \ 2826 notproduct(intx, MaxSubklassPrintSize, 4, \ 2827 "maximum number of subklasses to print when printing klass") \ 2828 \ 2829 product(intx, MaxInlineLevel, 9, \ 2830 "maximum number of nested calls that are inlined") \ 2831 \ 2832 product(intx, MaxRecursiveInlineLevel, 1, \ 2833 "maximum number of nested recursive calls that are inlined") \ 2834 \ 2835 product_pd(intx, InlineSmallCode, \ 2836 "Only inline already compiled methods if their code size is " \ 2837 "less than this") \ 2838 \ 2839 product(intx, MaxInlineSize, 35, \ 2840 "maximum bytecode size of a method to be inlined") \ 2841 \ 2842 product_pd(intx, FreqInlineSize, \ 2843 "maximum bytecode size of a frequent method to be inlined") \ 2844 \ 2845 product(intx, MaxTrivialSize, 6, \ 2846 "maximum bytecode size of a trivial method to be inlined") \ 2847 \ 2848 product(intx, MinInliningThreshold, 250, \ 2849 "min. invocation count a method needs to have to be inlined") \ 2850 \ 2851 develop(intx, MethodHistogramCutoff, 100, \ 2852 "cutoff value for method invoc. histogram (+CountCalls)") \ 2853 \ 2854 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2855 "# of interpreted methods to show in profile") \ 2856 \ 2857 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2858 "# of compiled methods to show in profile") \ 2859 \ 2860 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2861 "# of stub methods to show in profile") \ 2862 \ 2863 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2864 "# of runtime stub nodes to show in profile") \ 2865 \ 2866 product(intx, ProfileIntervalsTicks, 100, \ 2867 "# of ticks between printing of interval profile " \ 2868 "(+ProfileIntervals)") \ 2869 \ 2870 notproduct(intx, ScavengeALotInterval, 1, \ 2871 "Interval between which scavenge will occur with +ScavengeALot") \ 2872 \ 2873 notproduct(intx, FullGCALotInterval, 1, \ 2874 "Interval between which full gc will occur with +FullGCALot") \ 2875 \ 2876 notproduct(intx, FullGCALotStart, 0, \ 2877 "For which invocation to start FullGCAlot") \ 2878 \ 2879 notproduct(intx, FullGCALotDummies, 32*K, \ 2880 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2881 "to move") \ 2882 \ 2883 develop(intx, DontYieldALotInterval, 10, \ 2884 "Interval between which yields will be dropped (milliseconds)") \ 2885 \ 2886 develop(intx, MinSleepInterval, 1, \ 2887 "Minimum sleep() interval (milliseconds) when " \ 2888 "ConvertSleepToYield is off (used for SOLARIS)") \ 2889 \ 2890 develop(intx, ProfilerPCTickThreshold, 15, \ 2891 "Number of ticks in a PC buckets to be a hotspot") \ 2892 \ 2893 notproduct(intx, DeoptimizeALotInterval, 5, \ 2894 "Number of exits until DeoptimizeALot kicks in") \ 2895 \ 2896 notproduct(intx, ZombieALotInterval, 5, \ 2897 "Number of exits until ZombieALot kicks in") \ 2898 \ 2899 develop(bool, StressNonEntrant, false, \ 2900 "Mark nmethods non-entrant at registration") \ 2901 \ 2902 diagnostic(intx, MallocVerifyInterval, 0, \ 2903 "if non-zero, verify C heap after every N calls to " \ 2904 "malloc/realloc/free") \ 2905 \ 2906 diagnostic(intx, MallocVerifyStart, 0, \ 2907 "if non-zero, start verifying C heap after Nth call to " \ 2908 "malloc/realloc/free") \ 2909 \ 2910 diagnostic(uintx, MallocMaxTestWords, 0, \ 2911 "if non-zero, max # of Words that malloc/realloc can allocate " \ 2912 "(for testing only)") \ 2913 \ 2914 product(intx, TypeProfileWidth, 2, \ 2915 "number of receiver types to record in call/cast profile") \ 2916 \ 2917 develop(intx, BciProfileWidth, 2, \ 2918 "number of return bci's to record in ret profile") \ 2919 \ 2920 product(intx, PerMethodRecompilationCutoff, 400, \ 2921 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2922 \ 2923 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2924 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2925 \ 2926 product(intx, PerMethodTrapLimit, 100, \ 2927 "Limit on traps (of one kind) in a method (includes inlines)") \ 2928 \ 2929 product(intx, PerBytecodeTrapLimit, 4, \ 2930 "Limit on traps (of one kind) at a particular BCI") \ 2931 \ 2932 develop(intx, InlineFrequencyRatio, 20, \ 2933 "Ratio of call site execution to caller method invocation") \ 2934 \ 2935 develop_pd(intx, InlineFrequencyCount, \ 2936 "Count of call site execution necessary to trigger frequent " \ 2937 "inlining") \ 2938 \ 2939 develop(intx, InlineThrowCount, 50, \ 2940 "Force inlining of interpreted methods that throw this often") \ 2941 \ 2942 develop(intx, InlineThrowMaxSize, 200, \ 2943 "Force inlining of throwing methods smaller than this") \ 2944 \ 2945 develop(intx, ProfilerNodeSize, 1024, \ 2946 "Size in K to allocate for the Profile Nodes of each thread") \ 2947 \ 2948 product_pd(intx, PreInflateSpin, \ 2949 "Number of times to spin wait before inflation") \ 2950 \ 2951 /* gc parameters */ \ 2952 product(uintx, InitialHeapSize, 0, \ 2953 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2954 \ 2955 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2956 "Maximum heap size (in bytes)") \ 2957 \ 2958 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2959 "Initial tenured generation size (in bytes)") \ 2960 \ 2961 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2962 "Initial new generation size (in bytes)") \ 2963 \ 2964 product(uintx, MaxNewSize, max_uintx, \ 2965 "Maximum new generation size (in bytes), max_uintx means set " \ 2966 "ergonomically") \ 2967 \ 2968 product(uintx, PretenureSizeThreshold, 0, \ 2969 "Maximum size in bytes of objects allocated in DefNew " \ 2970 "generation; zero means no maximum") \ 2971 \ 2972 product(uintx, TLABSize, 0, \ 2973 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2974 \ 2975 product(uintx, MinTLABSize, 2*K, \ 2976 "Minimum allowed TLAB size (in bytes)") \ 2977 \ 2978 product(uintx, TLABAllocationWeight, 35, \ 2979 "Allocation averaging weight") \ 2980 \ 2981 product(uintx, TLABWasteTargetPercent, 1, \ 2982 "Percentage of Eden that can be wasted") \ 2983 \ 2984 product(uintx, TLABRefillWasteFraction, 64, \ 2985 "Max TLAB waste at a refill (internal fragmentation)") \ 2986 \ 2987 product(uintx, TLABWasteIncrement, 4, \ 2988 "Increment allowed waste at slow allocation") \ 2989 \ 2990 product(uintx, SurvivorRatio, 8, \ 2991 "Ratio of eden/survivor space size") \ 2992 \ 2993 product(uintx, NewRatio, 2, \ 2994 "Ratio of new/old generation sizes") \ 2995 \ 2996 product_pd(uintx, NewSizeThreadIncrease, \ 2997 "Additional size added to desired new generation size per " \ 2998 "non-daemon thread (in bytes)") \ 2999 \ 3000 product_pd(uintx, MetaspaceSize, \ 3001 "Initial size of Metaspaces (in bytes)") \ 3002 \ 3003 product(uintx, MaxMetaspaceSize, max_uintx, \ 3004 "Maximum size of Metaspaces (in bytes)") \ 3005 \ 3006 product(uintx, ClassMetaspaceSize, 2*M, \ 3007 "Maximum size of InstanceKlass area in Metaspace used for " \ 3008 "UseCompressedKlassPointers") \ 3009 \ 3010 product(uintx, MinHeapFreeRatio, 40, \ 3011 "Min percentage of heap free after GC to avoid expansion") \ 3012 \ 3013 product(uintx, MaxHeapFreeRatio, 70, \ 3014 "Max percentage of heap free after GC to avoid shrinking") \ 3015 \ 3016 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3017 "Number of milliseconds per MB of free space in the heap") \ 3018 \ 3019 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3020 "Min change in heap space due to GC (in bytes)") \ 3021 \ 3022 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3023 "Min expansion of Metaspace (in bytes)") \ 3024 \ 3025 product(uintx, MinMetaspaceFreeRatio, 40, \ 3026 "Min percentage of Metaspace free after GC to avoid expansion") \ 3027 \ 3028 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3029 "Max percentage of Metaspace free after GC to avoid shrinking") \ 3030 \ 3031 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3032 "Max expansion of Metaspace without full GC (in bytes)") \ 3033 \ 3034 product(intx, QueuedAllocationWarningCount, 0, \ 3035 "Number of times an allocation that queues behind a GC " \ 3036 "will retry before printing a warning") \ 3037 \ 3038 diagnostic(uintx, VerifyGCStartAt, 0, \ 3039 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3040 \ 3041 diagnostic(intx, VerifyGCLevel, 0, \ 3042 "Generation level at which to start +VerifyBefore/AfterGC") \ 3043 \ 3044 product(uintx, MaxTenuringThreshold, 15, \ 3045 "Maximum value for tenuring threshold") \ 3046 \ 3047 product(uintx, InitialTenuringThreshold, 7, \ 3048 "Initial value for tenuring threshold") \ 3049 \ 3050 product(uintx, TargetSurvivorRatio, 50, \ 3051 "Desired percentage of survivor space used after scavenge") \ 3052 \ 3053 product(uintx, MarkSweepDeadRatio, 5, \ 3054 "Percentage (0-100) of the old gen allowed as dead wood." \ 3055 "Serial mark sweep treats this as both the min and max value." \ 3056 "CMS uses this value only if it falls back to mark sweep." \ 3057 "Par compact uses a variable scale based on the density of the" \ 3058 "generation and treats this as the max value when the heap is" \ 3059 "either completely full or completely empty. Par compact also" \ 3060 "has a smaller default value; see arguments.cpp.") \ 3061 \ 3062 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3063 "How often should we fully compact the heap (ignoring the dead " \ 3064 "space parameters)") \ 3065 \ 3066 product(intx, PrintCMSStatistics, 0, \ 3067 "Statistics for CMS") \ 3068 \ 3069 product(bool, PrintCMSInitiationStatistics, false, \ 3070 "Statistics for initiating a CMS collection") \ 3071 \ 3072 product(intx, PrintFLSStatistics, 0, \ 3073 "Statistics for CMS' FreeListSpace") \ 3074 \ 3075 product(intx, PrintFLSCensus, 0, \ 3076 "Census for CMS' FreeListSpace") \ 3077 \ 3078 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3079 "Delay in ms between expansion and allocation") \ 3080 \ 3081 develop(uintx, GCWorkerDelayMillis, 0, \ 3082 "Delay in ms in scheduling GC workers") \ 3083 \ 3084 product(intx, DeferThrSuspendLoopCount, 4000, \ 3085 "(Unstable) Number of times to iterate in safepoint loop " \ 3086 " before blocking VM threads ") \ 3087 \ 3088 product(intx, DeferPollingPageLoopCount, -1, \ 3089 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3090 "before changing safepoint polling page to RO ") \ 3091 \ 3092 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3093 \ 3094 product(bool, PSChunkLargeArrays, true, \ 3095 "true: process large arrays in chunks") \ 3096 \ 3097 product(uintx, GCDrainStackTargetSize, 64, \ 3098 "how many entries we'll try to leave on the stack during " \ 3099 "parallel GC") \ 3100 \ 3101 /* stack parameters */ \ 3102 product_pd(intx, StackYellowPages, \ 3103 "Number of yellow zone (recoverable overflows) pages") \ 3104 \ 3105 product_pd(intx, StackRedPages, \ 3106 "Number of red zone (unrecoverable overflows) pages") \ 3107 \ 3108 product_pd(intx, StackShadowPages, \ 3109 "Number of shadow zone (for overflow checking) pages" \ 3110 " this should exceed the depth of the VM and native call stack") \ 3111 \ 3112 product_pd(intx, ThreadStackSize, \ 3113 "Thread Stack Size (in Kbytes)") \ 3114 \ 3115 product_pd(intx, VMThreadStackSize, \ 3116 "Non-Java Thread Stack Size (in Kbytes)") \ 3117 \ 3118 product_pd(intx, CompilerThreadStackSize, \ 3119 "Compiler Thread Stack Size (in Kbytes)") \ 3120 \ 3121 develop_pd(uintx, JVMInvokeMethodSlack, \ 3122 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3123 \ 3124 product(uintx, ThreadSafetyMargin, 50*M, \ 3125 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3126 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3127 "disable this feature") \ 3128 \ 3129 /* code cache parameters */ \ 3130 develop(uintx, CodeCacheSegmentSize, 64, \ 3131 "Code cache segment size (in bytes) - smallest unit of " \ 3132 "allocation") \ 3133 \ 3134 develop_pd(intx, CodeEntryAlignment, \ 3135 "Code entry alignment for generated code (in bytes)") \ 3136 \ 3137 product_pd(intx, OptoLoopAlignment, \ 3138 "Align inner loops to zero relative to this modulus") \ 3139 \ 3140 product_pd(uintx, InitialCodeCacheSize, \ 3141 "Initial code cache size (in bytes)") \ 3142 \ 3143 product_pd(uintx, ReservedCodeCacheSize, \ 3144 "Reserved code cache size (in bytes) - maximum code cache size") \ 3145 \ 3146 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3147 "When less than X space left, we stop compiling.") \ 3148 \ 3149 product_pd(uintx, CodeCacheExpansionSize, \ 3150 "Code cache expansion size (in bytes)") \ 3151 \ 3152 develop_pd(uintx, CodeCacheMinBlockLength, \ 3153 "Minimum number of segments in a code cache block.") \ 3154 \ 3155 notproduct(bool, ExitOnFullCodeCache, false, \ 3156 "Exit the VM if we fill the code cache.") \ 3157 \ 3158 product(bool, UseCodeCacheFlushing, true, \ 3159 "Attempt to clean the code cache before shutting off compiler") \ 3160 \ 3161 product(intx, MinCodeCacheFlushingInterval, 30, \ 3162 "Min number of seconds between code cache cleaning sessions") \ 3163 \ 3164 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3165 "When less than X space left, start code cache cleaning") \ 3166 \ 3167 /* interpreter debugging */ \ 3168 develop(intx, BinarySwitchThreshold, 5, \ 3169 "Minimal number of lookupswitch entries for rewriting to binary " \ 3170 "switch") \ 3171 \ 3172 develop(intx, StopInterpreterAt, 0, \ 3173 "Stops interpreter execution at specified bytecode number") \ 3174 \ 3175 develop(intx, TraceBytecodesAt, 0, \ 3176 "Traces bytecodes starting with specified bytecode number") \ 3177 \ 3178 /* compiler interface */ \ 3179 develop(intx, CIStart, 0, \ 3180 "the id of the first compilation to permit") \ 3181 \ 3182 develop(intx, CIStop, -1, \ 3183 "the id of the last compilation to permit") \ 3184 \ 3185 develop(intx, CIStartOSR, 0, \ 3186 "the id of the first osr compilation to permit " \ 3187 "(CICountOSR must be on)") \ 3188 \ 3189 develop(intx, CIStopOSR, -1, \ 3190 "the id of the last osr compilation to permit " \ 3191 "(CICountOSR must be on)") \ 3192 \ 3193 develop(intx, CIBreakAtOSR, -1, \ 3194 "id of osr compilation to break at") \ 3195 \ 3196 develop(intx, CIBreakAt, -1, \ 3197 "id of compilation to break at") \ 3198 \ 3199 product(ccstrlist, CompileOnly, "", \ 3200 "List of methods (pkg/class.name) to restrict compilation to") \ 3201 \ 3202 product(ccstr, CompileCommandFile, NULL, \ 3203 "Read compiler commands from this file [.hotspot_compiler]") \ 3204 \ 3205 product(ccstrlist, CompileCommand, "", \ 3206 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3207 \ 3208 develop(bool, ReplayCompiles, false, \ 3209 "Enable replay of compilations from ReplayDataFile") \ 3210 \ 3211 develop(ccstr, ReplayDataFile, "replay.txt", \ 3212 "file containing compilation replay information") \ 3213 \ 3214 develop(intx, ReplaySuppressInitializers, 2, \ 3215 "Controls handling of class initialization during replay" \ 3216 "0 - don't do anything special" \ 3217 "1 - treat all class initializers as empty" \ 3218 "2 - treat class initializers for application classes as empty" \ 3219 "3 - allow all class initializers to run during bootstrap but" \ 3220 " pretend they are empty after starting replay") \ 3221 \ 3222 develop(bool, ReplayIgnoreInitErrors, false, \ 3223 "Ignore exceptions thrown during initialization for replay") \ 3224 \ 3225 develop(bool, DumpReplayDataOnError, true, \ 3226 "record replay data for crashing compiler threads") \ 3227 \ 3228 product(bool, CICompilerCountPerCPU, false, \ 3229 "1 compiler thread for log(N CPUs)") \ 3230 \ 3231 develop(intx, CIFireOOMAt, -1, \ 3232 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3233 "(non-negative value throws OOM after this many CI accesses " \ 3234 "in each compile)") \ 3235 \ 3236 notproduct(bool, CIObjectFactoryVerify, false, \ 3237 "enable potentially expensive verification in ciObjectFactory") \ 3238 \ 3239 /* Priorities */ \ 3240 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3241 \ 3242 product(intx, ThreadPriorityPolicy, 0, \ 3243 "0 : Normal. "\ 3244 " VM chooses priorities that are appropriate for normal "\ 3245 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3246 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3247 " map to lower native priority values. On Windows applications"\ 3248 " are allowed to use higher native priorities. However, with "\ 3249 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3250 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3251 " interfere with system threads. On Linux thread priorities "\ 3252 " are ignored because the OS does not support static priority "\ 3253 " in SCHED_OTHER scheduling class which is the only choice for"\ 3254 " non-root, non-realtime applications. "\ 3255 "1 : Aggressive. "\ 3256 " Java thread priorities map over to the entire range of "\ 3257 " native thread priorities. Higher Java thread priorities map "\ 3258 " to higher native thread priorities. This policy should be "\ 3259 " used with care, as sometimes it can cause performance "\ 3260 " degradation in the application and/or the entire system. On "\ 3261 " Linux this policy requires root privilege.") \ 3262 \ 3263 product(bool, ThreadPriorityVerbose, false, \ 3264 "Print priority changes") \ 3265 \ 3266 product(intx, DefaultThreadPriority, -1, \ 3267 "The native priority at which threads run if not elsewhere " \ 3268 "specified (-1 means no change)") \ 3269 \ 3270 product(intx, CompilerThreadPriority, -1, \ 3271 "The native priority at which compiler threads should run " \ 3272 "(-1 means no change)") \ 3273 \ 3274 product(intx, VMThreadPriority, -1, \ 3275 "The native priority at which the VM thread should run " \ 3276 "(-1 means no change)") \ 3277 \ 3278 product(bool, CompilerThreadHintNoPreempt, true, \ 3279 "(Solaris only) Give compiler threads an extra quanta") \ 3280 \ 3281 product(bool, VMThreadHintNoPreempt, false, \ 3282 "(Solaris only) Give VM thread an extra quanta") \ 3283 \ 3284 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3285 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3286 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3287 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3288 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3289 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3290 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3291 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3292 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3293 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3294 \ 3295 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3296 "Java thread priority 10 maps to critical scheduling priority") \ 3297 \ 3298 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3299 "Compiler thread(s) run at critical scheduling priority") \ 3300 \ 3301 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3302 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3303 \ 3304 /* compiler debugging */ \ 3305 notproduct(intx, CompileTheWorldStartAt, 1, \ 3306 "First class to consider when using +CompileTheWorld") \ 3307 \ 3308 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3309 "Last class to consider when using +CompileTheWorld") \ 3310 \ 3311 develop(intx, NewCodeParameter, 0, \ 3312 "Testing Only: Create a dedicated integer parameter before " \ 3313 "putback") \ 3314 \ 3315 /* new oopmap storage allocation */ \ 3316 develop(intx, MinOopMapAllocation, 8, \ 3317 "Minimum number of OopMap entries in an OopMapSet") \ 3318 \ 3319 /* Background Compilation */ \ 3320 develop(intx, LongCompileThreshold, 50, \ 3321 "Used with +TraceLongCompiles") \ 3322 \ 3323 product(intx, StarvationMonitorInterval, 200, \ 3324 "Pause between each check in ms") \ 3325 \ 3326 /* recompilation */ \ 3327 product_pd(intx, CompileThreshold, \ 3328 "number of interpreted method invocations before (re-)compiling") \ 3329 \ 3330 product_pd(intx, BackEdgeThreshold, \ 3331 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3332 \ 3333 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3334 "Interpreter (tier 0) invocation notification frequency.") \ 3335 \ 3336 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3337 "C1 without MDO (tier 2) invocation notification frequency.") \ 3338 \ 3339 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3340 "C1 with MDO profiling (tier 3) invocation notification " \ 3341 "frequency.") \ 3342 \ 3343 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3344 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3345 \ 3346 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3347 "Interpreter (tier 0) invocation notification frequency.") \ 3348 \ 3349 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3350 "C1 without MDO (tier 2) invocation notification frequency.") \ 3351 \ 3352 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3353 "C1 with MDO profiling (tier 3) invocation notification " \ 3354 "frequency.") \ 3355 \ 3356 product(intx, Tier2CompileThreshold, 0, \ 3357 "threshold at which tier 2 compilation is invoked") \ 3358 \ 3359 product(intx, Tier2BackEdgeThreshold, 0, \ 3360 "Back edge threshold at which tier 2 compilation is invoked") \ 3361 \ 3362 product(intx, Tier3InvocationThreshold, 200, \ 3363 "Compile if number of method invocations crosses this " \ 3364 "threshold") \ 3365 \ 3366 product(intx, Tier3MinInvocationThreshold, 100, \ 3367 "Minimum invocation to compile at tier 3") \ 3368 \ 3369 product(intx, Tier3CompileThreshold, 2000, \ 3370 "Threshold at which tier 3 compilation is invoked (invocation " \ 3371 "minimum must be satisfied.") \ 3372 \ 3373 product(intx, Tier3BackEdgeThreshold, 60000, \ 3374 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3375 \ 3376 product(intx, Tier4InvocationThreshold, 5000, \ 3377 "Compile if number of method invocations crosses this " \ 3378 "threshold") \ 3379 \ 3380 product(intx, Tier4MinInvocationThreshold, 600, \ 3381 "Minimum invocation to compile at tier 4") \ 3382 \ 3383 product(intx, Tier4CompileThreshold, 15000, \ 3384 "Threshold at which tier 4 compilation is invoked (invocation " \ 3385 "minimum must be satisfied.") \ 3386 \ 3387 product(intx, Tier4BackEdgeThreshold, 40000, \ 3388 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3389 \ 3390 product(intx, Tier3DelayOn, 5, \ 3391 "If C2 queue size grows over this amount per compiler thread " \ 3392 "stop compiling at tier 3 and start compiling at tier 2") \ 3393 \ 3394 product(intx, Tier3DelayOff, 2, \ 3395 "If C2 queue size is less than this amount per compiler thread " \ 3396 "allow methods compiled at tier 2 transition to tier 3") \ 3397 \ 3398 product(intx, Tier3LoadFeedback, 5, \ 3399 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3400 "reaches this amount per compiler thread") \ 3401 \ 3402 product(intx, Tier4LoadFeedback, 3, \ 3403 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3404 "reaches this amount per compiler thread") \ 3405 \ 3406 product(intx, TieredCompileTaskTimeout, 50, \ 3407 "Kill compile task if method was not used within " \ 3408 "given timeout in milliseconds") \ 3409 \ 3410 product(intx, TieredStopAtLevel, 4, \ 3411 "Stop at given compilation level") \ 3412 \ 3413 product(intx, Tier0ProfilingStartPercentage, 200, \ 3414 "Start profiling in interpreter if the counters exceed tier 3" \ 3415 "thresholds by the specified percentage") \ 3416 \ 3417 product(intx, TieredRateUpdateMinTime, 1, \ 3418 "Minimum rate sampling interval (in milliseconds)") \ 3419 \ 3420 product(intx, TieredRateUpdateMaxTime, 25, \ 3421 "Maximum rate sampling interval (in milliseconds)") \ 3422 \ 3423 product_pd(bool, TieredCompilation, \ 3424 "Enable tiered compilation") \ 3425 \ 3426 product(bool, PrintTieredEvents, false, \ 3427 "Print tiered events notifications") \ 3428 \ 3429 product_pd(intx, OnStackReplacePercentage, \ 3430 "NON_TIERED number of method invocations/branches (expressed as %"\ 3431 "of CompileThreshold) before (re-)compiling OSR code") \ 3432 \ 3433 product(intx, InterpreterProfilePercentage, 33, \ 3434 "NON_TIERED number of method invocations/branches (expressed as %"\ 3435 "of CompileThreshold) before profiling in the interpreter") \ 3436 \ 3437 develop(intx, MaxRecompilationSearchLength, 10, \ 3438 "max. # frames to inspect searching for recompilee") \ 3439 \ 3440 develop(intx, MaxInterpretedSearchLength, 3, \ 3441 "max. # interp. frames to skip when searching for recompilee") \ 3442 \ 3443 develop(intx, DesiredMethodLimit, 8000, \ 3444 "desired max. method size (in bytecodes) after inlining") \ 3445 \ 3446 develop(intx, HugeMethodLimit, 8000, \ 3447 "don't compile methods larger than this if " \ 3448 "+DontCompileHugeMethods") \ 3449 \ 3450 /* New JDK 1.4 reflection implementation */ \ 3451 \ 3452 develop(bool, UseNewReflection, true, \ 3453 "Temporary flag for transition to reflection based on dynamic " \ 3454 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3455 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3456 "changes were needed") \ 3457 \ 3458 develop(bool, VerifyReflectionBytecodes, false, \ 3459 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3460 "in situations like that described in 4486457 or for " \ 3461 "constructors generated for serialization, so can not be enabled "\ 3462 "in product.") \ 3463 \ 3464 product(bool, ReflectionWrapResolutionErrors, true, \ 3465 "Temporary flag for transition to AbstractMethodError wrapped " \ 3466 "in InvocationTargetException. See 6531596") \ 3467 \ 3468 \ 3469 develop(intx, FastSuperclassLimit, 8, \ 3470 "Depth of hardwired instanceof accelerator array") \ 3471 \ 3472 /* Properties for Java libraries */ \ 3473 \ 3474 product(uintx, MaxDirectMemorySize, 0, \ 3475 "Maximum total size of NIO direct-buffer allocations") \ 3476 \ 3477 /* temporary developer defined flags */ \ 3478 \ 3479 diagnostic(bool, UseNewCode, false, \ 3480 "Testing Only: Use the new version while testing") \ 3481 \ 3482 diagnostic(bool, UseNewCode2, false, \ 3483 "Testing Only: Use the new version while testing") \ 3484 \ 3485 diagnostic(bool, UseNewCode3, false, \ 3486 "Testing Only: Use the new version while testing") \ 3487 \ 3488 /* flags for performance data collection */ \ 3489 \ 3490 product(bool, UsePerfData, falseInEmbedded, \ 3491 "Flag to disable jvmstat instrumentation for performance testing" \ 3492 "and problem isolation purposes.") \ 3493 \ 3494 product(bool, PerfDataSaveToFile, false, \ 3495 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3496 \ 3497 product(ccstr, PerfDataSaveFile, NULL, \ 3498 "Save PerfData memory to the specified absolute pathname," \ 3499 "%p in the file name if present will be replaced by pid") \ 3500 \ 3501 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3502 "Data sampling interval in milliseconds") \ 3503 \ 3504 develop(bool, PerfTraceDataCreation, false, \ 3505 "Trace creation of Performance Data Entries") \ 3506 \ 3507 develop(bool, PerfTraceMemOps, false, \ 3508 "Trace PerfMemory create/attach/detach calls") \ 3509 \ 3510 product(bool, PerfDisableSharedMem, false, \ 3511 "Store performance data in standard memory") \ 3512 \ 3513 product(intx, PerfDataMemorySize, 32*K, \ 3514 "Size of performance data memory region. Will be rounded " \ 3515 "up to a multiple of the native os page size.") \ 3516 \ 3517 product(intx, PerfMaxStringConstLength, 1024, \ 3518 "Maximum PerfStringConstant string length before truncation") \ 3519 \ 3520 product(bool, PerfAllowAtExitRegistration, false, \ 3521 "Allow registration of atexit() methods") \ 3522 \ 3523 product(bool, PerfBypassFileSystemCheck, false, \ 3524 "Bypass Win32 file system criteria checks (Windows Only)") \ 3525 \ 3526 product(intx, UnguardOnExecutionViolation, 0, \ 3527 "Unguard page and retry on no-execute fault (Win32 only)" \ 3528 "0=off, 1=conservative, 2=aggressive") \ 3529 \ 3530 /* Serviceability Support */ \ 3531 \ 3532 product(bool, ManagementServer, false, \ 3533 "Create JMX Management Server") \ 3534 \ 3535 product(bool, DisableAttachMechanism, false, \ 3536 "Disable mechanism that allows tools to attach to this VM") \ 3537 \ 3538 product(bool, StartAttachListener, false, \ 3539 "Always start Attach Listener at VM startup") \ 3540 \ 3541 manageable(bool, PrintConcurrentLocks, false, \ 3542 "Print java.util.concurrent locks in thread dump") \ 3543 \ 3544 product(bool, TransmitErrorReport, false, \ 3545 "Enable error report transmission on erroneous termination") \ 3546 \ 3547 product(ccstr, ErrorReportServer, NULL, \ 3548 "Override built-in error report server address") \ 3549 \ 3550 /* Shared spaces */ \ 3551 \ 3552 product(bool, UseSharedSpaces, true, \ 3553 "Use shared spaces for metadata") \ 3554 \ 3555 product(bool, RequireSharedSpaces, false, \ 3556 "Require shared spaces for metadata") \ 3557 \ 3558 product(bool, DumpSharedSpaces, false, \ 3559 "Special mode: JVM reads a class list, loads classes, builds " \ 3560 "shared spaces, and dumps the shared spaces to a file to be " \ 3561 "used in future JVM runs.") \ 3562 \ 3563 product(bool, PrintSharedSpaces, false, \ 3564 "Print usage of shared spaces") \ 3565 \ 3566 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3567 "Size of read-write space for metadata (in bytes)") \ 3568 \ 3569 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3570 "Size of read-only space for metadata (in bytes)") \ 3571 \ 3572 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3573 "Size of the shared miscellaneous data area (in bytes)") \ 3574 \ 3575 product(uintx, SharedMiscCodeSize, 120*K, \ 3576 "Size of the shared miscellaneous code area (in bytes)") \ 3577 \ 3578 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3579 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3580 "Address to allocate shared memory region for class data") \ 3581 \ 3582 diagnostic(bool, EnableInvokeDynamic, true, \ 3583 "support JSR 292 (method handles, invokedynamic, " \ 3584 "anonymous classes") \ 3585 \ 3586 diagnostic(bool, PrintMethodHandleStubs, false, \ 3587 "Print generated stub code for method handles") \ 3588 \ 3589 develop(bool, TraceMethodHandles, false, \ 3590 "trace internal method handle operations") \ 3591 \ 3592 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3593 "perform extra checks when constructing method handles") \ 3594 \ 3595 diagnostic(bool, ShowHiddenFrames, false, \ 3596 "show method handle implementation frames (usually hidden)") \ 3597 \ 3598 experimental(bool, TrustFinalNonStaticFields, false, \ 3599 "trust final non-static declarations for constant folding") \ 3600 \ 3601 develop(bool, TraceInvokeDynamic, false, \ 3602 "trace internal invoke dynamic operations") \ 3603 \ 3604 diagnostic(bool, PauseAtStartup, false, \ 3605 "Causes the VM to pause at startup time and wait for the pause " \ 3606 "file to be removed (default: ./vm.paused.<pid>)") \ 3607 \ 3608 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3609 "The file to create and for whose removal to await when pausing " \ 3610 "at startup. (default: ./vm.paused.<pid>)") \ 3611 \ 3612 diagnostic(bool, PauseAtExit, false, \ 3613 "Pause and wait for keypress on exit if a debugger is attached") \ 3614 \ 3615 product(bool, ExtendedDTraceProbes, false, \ 3616 "Enable performance-impacting dtrace probes") \ 3617 \ 3618 product(bool, DTraceMethodProbes, false, \ 3619 "Enable dtrace probes for method-entry and method-exit") \ 3620 \ 3621 product(bool, DTraceAllocProbes, false, \ 3622 "Enable dtrace probes for object allocation") \ 3623 \ 3624 product(bool, DTraceMonitorProbes, false, \ 3625 "Enable dtrace probes for monitor events") \ 3626 \ 3627 product(bool, RelaxAccessControlCheck, false, \ 3628 "Relax the access control checks in the verifier") \ 3629 \ 3630 diagnostic(bool, PrintDTraceDOF, false, \ 3631 "Print the DTrace DOF passed to the system for JSDT probes") \ 3632 \ 3633 product(uintx, StringTableSize, defaultStringTableSize, \ 3634 "Number of buckets in the interned String table") \ 3635 \ 3636 develop(bool, TraceDefaultMethods, false, \ 3637 "Trace the default method processing steps") \ 3638 \ 3639 develop(bool, ParseAllGenericSignatures, false, \ 3640 "Parse all generic signatures while classloading") \ 3641 \ 3642 develop(bool, VerifyGenericSignatures, false, \ 3643 "Abort VM on erroneous or inconsistent generic signatures") \ 3644 \ 3645 product(bool, UseVMInterruptibleIO, false, \ 3646 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3647 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3648 " of this flag is true for JDK 6 and earlier") \ 3649 \ 3650 diagnostic(bool, WhiteBoxAPI, false, \ 3651 "Enable internal testing APIs") \ 3652 \ 3653 product(bool, PrintGCCause, true, \ 3654 "Include GC cause in GC logging") \ 3655 \ 3656 product(bool, AllowNonVirtualCalls, false, \ 3657 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") 3658 3659/* 3660 * Macros for factoring of globals 3661 */ 3662 3663// Interface macros 3664#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3665#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3666#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3667#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3668#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3669#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3670#ifdef PRODUCT 3671#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3672#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3673#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3674#else 3675#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3676#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3677#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3678#endif 3679// Special LP64 flags, product only needed for now. 3680#ifdef _LP64 3681#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3682#else 3683#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3684#endif // _LP64 3685 3686// Implementation macros 3687#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3688#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3689#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3690#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3691#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3692#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3693#ifdef PRODUCT 3694#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3695#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3696#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3697#else 3698#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3699#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3700#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3701#endif 3702#ifdef _LP64 3703#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3704#else 3705#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3706#endif // _LP64 3707 3708RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG) 3709 3710RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3711 3712ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3713 3714// Extensions 3715 3716#include "runtime/globals_ext.hpp" 3717 3718#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3719