globals.hpp revision 2851:763f01599ff4
1/* 2 * Copyright (c) 1997, 2011, 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#ifdef TARGET_ARCH_x86 30# include "globals_x86.hpp" 31#endif 32#ifdef TARGET_ARCH_sparc 33# include "globals_sparc.hpp" 34#endif 35#ifdef TARGET_ARCH_zero 36# include "globals_zero.hpp" 37#endif 38#ifdef TARGET_ARCH_arm 39# include "globals_arm.hpp" 40#endif 41#ifdef TARGET_ARCH_ppc 42# include "globals_ppc.hpp" 43#endif 44#ifdef TARGET_OS_FAMILY_linux 45# include "globals_linux.hpp" 46#endif 47#ifdef TARGET_OS_FAMILY_solaris 48# include "globals_solaris.hpp" 49#endif 50#ifdef TARGET_OS_FAMILY_windows 51# include "globals_windows.hpp" 52#endif 53#ifdef TARGET_OS_FAMILY_bsd 54# include "globals_bsd.hpp" 55#endif 56#ifdef TARGET_OS_ARCH_linux_x86 57# include "globals_linux_x86.hpp" 58#endif 59#ifdef TARGET_OS_ARCH_linux_sparc 60# include "globals_linux_sparc.hpp" 61#endif 62#ifdef TARGET_OS_ARCH_linux_zero 63# include "globals_linux_zero.hpp" 64#endif 65#ifdef TARGET_OS_ARCH_solaris_x86 66# include "globals_solaris_x86.hpp" 67#endif 68#ifdef TARGET_OS_ARCH_solaris_sparc 69# include "globals_solaris_sparc.hpp" 70#endif 71#ifdef TARGET_OS_ARCH_windows_x86 72# include "globals_windows_x86.hpp" 73#endif 74#ifdef TARGET_OS_ARCH_linux_arm 75# include "globals_linux_arm.hpp" 76#endif 77#ifdef TARGET_OS_ARCH_linux_ppc 78# include "globals_linux_ppc.hpp" 79#endif 80#ifdef TARGET_OS_ARCH_bsd_x86 81# include "globals_bsd_x86.hpp" 82#endif 83#ifdef TARGET_OS_ARCH_bsd_zero 84# include "globals_bsd_zero.hpp" 85#endif 86#ifdef COMPILER1 87#ifdef TARGET_ARCH_x86 88# include "c1_globals_x86.hpp" 89#endif 90#ifdef TARGET_ARCH_sparc 91# include "c1_globals_sparc.hpp" 92#endif 93#ifdef TARGET_ARCH_arm 94# include "c1_globals_arm.hpp" 95#endif 96#ifdef TARGET_ARCH_ppc 97# include "c1_globals_ppc.hpp" 98#endif 99#ifdef TARGET_OS_FAMILY_linux 100# include "c1_globals_linux.hpp" 101#endif 102#ifdef TARGET_OS_FAMILY_solaris 103# include "c1_globals_solaris.hpp" 104#endif 105#ifdef TARGET_OS_FAMILY_windows 106# include "c1_globals_windows.hpp" 107#endif 108#ifdef TARGET_OS_FAMILY_bsd 109# include "c1_globals_bsd.hpp" 110#endif 111#endif 112#ifdef COMPILER2 113#ifdef TARGET_ARCH_x86 114# include "c2_globals_x86.hpp" 115#endif 116#ifdef TARGET_ARCH_sparc 117# include "c2_globals_sparc.hpp" 118#endif 119#ifdef TARGET_ARCH_arm 120# include "c2_globals_arm.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_linux 123# include "c2_globals_linux.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_solaris 126# include "c2_globals_solaris.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_windows 129# include "c2_globals_windows.hpp" 130#endif 131#ifdef TARGET_OS_FAMILY_bsd 132# include "c2_globals_bsd.hpp" 133#endif 134#endif 135#ifdef SHARK 136#ifdef TARGET_ARCH_zero 137# include "shark_globals_zero.hpp" 138#endif 139#endif 140 141#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 142define_pd_global(bool, BackgroundCompilation, false); 143define_pd_global(bool, UseTLAB, false); 144define_pd_global(bool, CICompileOSR, false); 145define_pd_global(bool, UseTypeProfile, false); 146define_pd_global(bool, UseOnStackReplacement, false); 147define_pd_global(bool, InlineIntrinsics, false); 148define_pd_global(bool, PreferInterpreterNativeStubs, true); 149define_pd_global(bool, ProfileInterpreter, false); 150define_pd_global(bool, ProfileTraps, false); 151define_pd_global(bool, TieredCompilation, false); 152 153define_pd_global(intx, CompileThreshold, 0); 154define_pd_global(intx, BackEdgeThreshold, 0); 155 156define_pd_global(intx, OnStackReplacePercentage, 0); 157define_pd_global(bool, ResizeTLAB, false); 158define_pd_global(intx, FreqInlineSize, 0); 159define_pd_global(intx, InlineSmallCode, 0); 160define_pd_global(intx, NewSizeThreadIncrease, 4*K); 161define_pd_global(intx, InlineClassNatives, true); 162define_pd_global(intx, InlineUnsafeOps, true); 163define_pd_global(intx, InitialCodeCacheSize, 160*K); 164define_pd_global(intx, ReservedCodeCacheSize, 32*M); 165define_pd_global(intx, CodeCacheExpansionSize, 32*K); 166define_pd_global(intx, CodeCacheMinBlockLength, 1); 167define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 168define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 169define_pd_global(bool, NeverActAsServerClassMachine, true); 170define_pd_global(uint64_t,MaxRAM, 1ULL*G); 171#define CI_COMPILER_COUNT 0 172#else 173 174#ifdef COMPILER2 175#define CI_COMPILER_COUNT 2 176#else 177#define CI_COMPILER_COUNT 1 178#endif // COMPILER2 179 180#endif // no compilers 181 182 183// string type aliases used only in this file 184typedef const char* ccstr; 185typedef const char* ccstrlist; // represents string arguments which accumulate 186 187enum FlagValueOrigin { 188 DEFAULT = 0, 189 COMMAND_LINE = 1, 190 ENVIRON_VAR = 2, 191 CONFIG_FILE = 3, 192 MANAGEMENT = 4, 193 ERGONOMIC = 5, 194 ATTACH_ON_DEMAND = 6, 195 INTERNAL = 99 196}; 197 198struct Flag { 199 const char *type; 200 const char *name; 201 void* addr; 202 203 NOT_PRODUCT(const char *doc;) 204 205 const char *kind; 206 FlagValueOrigin origin; 207 208 // points to all Flags static array 209 static Flag *flags; 210 211 // number of flags 212 static size_t numFlags; 213 214 static Flag* find_flag(char* name, size_t length); 215 216 bool is_bool() const { return strcmp(type, "bool") == 0; } 217 bool get_bool() const { return *((bool*) addr); } 218 void set_bool(bool value) { *((bool*) addr) = value; } 219 220 bool is_intx() const { return strcmp(type, "intx") == 0; } 221 intx get_intx() const { return *((intx*) addr); } 222 void set_intx(intx value) { *((intx*) addr) = value; } 223 224 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 225 uintx get_uintx() const { return *((uintx*) addr); } 226 void set_uintx(uintx value) { *((uintx*) addr) = value; } 227 228 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 229 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 230 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 231 232 bool is_double() const { return strcmp(type, "double") == 0; } 233 double get_double() const { return *((double*) addr); } 234 void set_double(double value) { *((double*) addr) = value; } 235 236 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 237 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 238 ccstr get_ccstr() const { return *((ccstr*) addr); } 239 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 240 241 bool is_unlocker() const; 242 bool is_unlocked() const; 243 bool is_writeable() const; 244 bool is_external() const; 245 246 void print_on(outputStream* st, bool withComments = false ); 247 void print_as_flag(outputStream* st); 248}; 249 250// debug flags control various aspects of the VM and are global accessible 251 252// use FlagSetting to temporarily change some debug flag 253// e.g. FlagSetting fs(DebugThisAndThat, true); 254// restored to previous value upon leaving scope 255class FlagSetting { 256 bool val; 257 bool* flag; 258 public: 259 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 260 ~FlagSetting() { *flag = val; } 261}; 262 263 264class CounterSetting { 265 intx* counter; 266 public: 267 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 268 ~CounterSetting() { (*counter)--; } 269}; 270 271 272class IntFlagSetting { 273 intx val; 274 intx* flag; 275 public: 276 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 277 ~IntFlagSetting() { *flag = val; } 278}; 279 280 281class DoubleFlagSetting { 282 double val; 283 double* flag; 284 public: 285 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 286 ~DoubleFlagSetting() { *flag = val; } 287}; 288 289 290class CommandLineFlags { 291 public: 292 static bool boolAt(char* name, size_t len, bool* value); 293 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 294 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 295 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 296 297 static bool intxAt(char* name, size_t len, intx* value); 298 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 299 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 300 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 301 302 static bool uintxAt(char* name, size_t len, uintx* value); 303 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 304 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 305 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 306 307 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 308 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 309 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 310 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 311 312 static bool doubleAt(char* name, size_t len, double* value); 313 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 314 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 315 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 316 317 static bool ccstrAt(char* name, size_t len, ccstr* value); 318 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 319 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 320 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 321 322 // Returns false if name is not a command line flag. 323 static bool wasSetOnCmdline(const char* name, bool* value); 324 static void printSetFlags(); 325 326 static void printFlags(bool withComments = false ); 327 328 static void verify() PRODUCT_RETURN; 329}; 330 331// use this for flags that are true by default in the debug version but 332// false in the optimized version, and vice versa 333#ifdef ASSERT 334#define trueInDebug true 335#define falseInDebug false 336#else 337#define trueInDebug false 338#define falseInDebug true 339#endif 340 341// use this for flags that are true per default in the product build 342// but false in development builds, and vice versa 343#ifdef PRODUCT 344#define trueInProduct true 345#define falseInProduct false 346#else 347#define trueInProduct false 348#define falseInProduct true 349#endif 350 351// use this for flags that are true per default in the tiered build 352// but false in non-tiered builds, and vice versa 353#ifdef TIERED 354#define trueInTiered true 355#define falseInTiered false 356#else 357#define trueInTiered false 358#define falseInTiered true 359#endif 360 361#ifdef JAVASE_EMBEDDED 362#define falseInEmbedded false 363#else 364#define falseInEmbedded true 365#endif 366 367// develop flags are settable / visible only during development and are constant in the PRODUCT version 368// product flags are always settable / visible 369// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 370 371// A flag must be declared with one of the following types: 372// bool, intx, uintx, ccstr. 373// The type "ccstr" is an alias for "const char*" and is used 374// only in this file, because the macrology requires single-token type names. 375 376// Note: Diagnostic options are not meant for VM tuning or for product modes. 377// They are to be used for VM quality assurance or field diagnosis 378// of VM bugs. They are hidden so that users will not be encouraged to 379// try them as if they were VM ordinary execution options. However, they 380// are available in the product version of the VM. Under instruction 381// from support engineers, VM customers can turn them on to collect 382// diagnostic information about VM problems. To use a VM diagnostic 383// option, you must first specify +UnlockDiagnosticVMOptions. 384// (This master switch also affects the behavior of -Xprintflags.) 385// 386// 387// commercial flags support features for which Oracle charges a fee for 388// production use, though they're free for development and/or evaluation. 389// There's no enforcement mechanism in Hotspot other than that 390// -XX:+UnlockCommercialVMOptions must first be specified in order to use them. 391// 392// experimental flags are in support of features that are not 393// part of the officially supported product, but are available 394// for experimenting with. They could, for example, be performance 395// features that may not have undergone full or rigorous QA, but which may 396// help performance in some cases and released for experimentation 397// by the community of users and developers. This flag also allows one to 398// be able to build a fully supported product that nonetheless also 399// ships with some unsupported, lightly tested, experimental features. 400// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 401// UnlockExperimentalVMOptions flag, which allows the control and 402// modification of the experimental flags. 403// 404// Nota bene: neither diagnostic nor experimental options should be used casually, 405// and they are not supported on production loads, except under explicit 406// direction from support engineers. 407// 408// manageable flags are writeable external product flags. 409// They are dynamically writeable through the JDK management interface 410// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 411// These flags are external exported interface (see CCC). The list of 412// manageable flags can be queried programmatically through the management 413// interface. 414// 415// A flag can be made as "manageable" only if 416// - the flag is defined in a CCC as an external exported interface. 417// - the VM implementation supports dynamic setting of the flag. 418// This implies that the VM must *always* query the flag variable 419// and not reuse state related to the flag state at any given time. 420// - you want the flag to be queried programmatically by the customers. 421// 422// product_rw flags are writeable internal product flags. 423// They are like "manageable" flags but for internal/private use. 424// The list of product_rw flags are internal/private flags which 425// may be changed/removed in a future release. It can be set 426// through the management interface to get/set value 427// when the name of flag is supplied. 428// 429// A flag can be made as "product_rw" only if 430// - the VM implementation supports dynamic setting of the flag. 431// This implies that the VM must *always* query the flag variable 432// and not reuse state related to the flag state at any given time. 433// 434// Note that when there is a need to support develop flags to be writeable, 435// it can be done in the same way as product_rw. 436 437#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, commercial, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 438 \ 439 lp64_product(bool, UseCompressedOops, false, \ 440 "Use 32-bit object references in 64-bit VM. " \ 441 "lp64_product means flag is always constant in 32 bit VM") \ 442 \ 443 notproduct(bool, CheckCompressedOops, true, \ 444 "generate checks in encoding/decoding code in debug VM") \ 445 \ 446 product_pd(uintx, HeapBaseMinAddress, \ 447 "OS specific low limit for heap base address") \ 448 \ 449 diagnostic(bool, PrintCompressedOopsMode, false, \ 450 "Print compressed oops base address and encoding mode") \ 451 \ 452 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 453 "Default object alignment in bytes, 8 is minimum") \ 454 \ 455 /* UseMembar is theoretically a temp flag used for memory barrier \ 456 * removal testing. It was supposed to be removed before FCS but has \ 457 * been re-added (see 6401008) */ \ 458 product_pd(bool, UseMembar, \ 459 "(Unstable) Issues membars on thread state transitions") \ 460 \ 461 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 462 * that don't support it. This will be replaced by processor detection \ 463 * logic. \ 464 */ \ 465 product(bool, UsePPCLWSYNC, true, \ 466 "Use lwsync instruction if true, else use slower sync") \ 467 \ 468 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 469 "Whether to clean the chunk pool asynchronously") \ 470 \ 471 /* Temporary: See 6948537 */ \ 472 experimental(bool, UseMemSetInBOT, true, \ 473 "(Unstable) uses memset in BOT updates in GC code") \ 474 \ 475 commercial(bool, UnlockCommercialVMOptions, false, \ 476 "Enable normal processing of flags relating to commercial " \ 477 "features") \ 478 \ 479 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 480 "Enable normal processing of flags relating to field diagnostics")\ 481 \ 482 experimental(bool, UnlockExperimentalVMOptions, false, \ 483 "Enable normal processing of flags relating to experimental " \ 484 "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(intx, UseVIS, 99, \ 537 "Highest supported VIS instructions set on Sparc") \ 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, BailoutToInterpreterForThrows, false, \ 576 "Compiled methods which throws/catches exceptions will be " \ 577 "deopt and intp.") \ 578 \ 579 develop(bool, NoYieldsInMicrolock, false, \ 580 "Disable yields in microlock") \ 581 \ 582 develop(bool, TraceOopMapGeneration, false, \ 583 "Shows oopmap generation") \ 584 \ 585 product(bool, MethodFlushing, true, \ 586 "Reclamation of zombie and not-entrant methods") \ 587 \ 588 develop(bool, VerifyStack, false, \ 589 "Verify stack of each thread when it is entering a runtime call") \ 590 \ 591 diagnostic(bool, ForceUnreachable, false, \ 592 "Make all non code cache addresses unreachable by forcing use of "\ 593 "64-bit literal fixups") \ 594 \ 595 notproduct(bool, StressDerivedPointers, false, \ 596 "Force scavenge when a derived pointers is detected on stack " \ 597 "after rtm call") \ 598 \ 599 develop(bool, TraceDerivedPointers, false, \ 600 "Trace traversal of derived pointers on stack") \ 601 \ 602 notproduct(bool, TraceCodeBlobStacks, false, \ 603 "Trace stack-walk of codeblobs") \ 604 \ 605 product(bool, PrintJNIResolving, false, \ 606 "Used to implement -v:jni") \ 607 \ 608 notproduct(bool, PrintRewrites, false, \ 609 "Print methods that are being rewritten") \ 610 \ 611 product(bool, UseInlineCaches, true, \ 612 "Use Inline Caches for virtual calls ") \ 613 \ 614 develop(bool, InlineArrayCopy, true, \ 615 "inline arraycopy native that is known to be part of " \ 616 "base library DLL") \ 617 \ 618 develop(bool, InlineObjectHash, true, \ 619 "inline Object::hashCode() native that is known to be part " \ 620 "of base library DLL") \ 621 \ 622 develop(bool, InlineObjectCopy, true, \ 623 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 624 \ 625 develop(bool, InlineNatives, true, \ 626 "inline natives that are known to be part of base library DLL") \ 627 \ 628 develop(bool, InlineMathNatives, true, \ 629 "inline SinD, CosD, etc.") \ 630 \ 631 develop(bool, InlineClassNatives, true, \ 632 "inline Class.isInstance, etc") \ 633 \ 634 develop(bool, InlineAtomicLong, true, \ 635 "inline sun.misc.AtomicLong") \ 636 \ 637 develop(bool, InlineThreadNatives, true, \ 638 "inline Thread.currentThread, etc") \ 639 \ 640 develop(bool, InlineReflectionGetCallerClass, true, \ 641 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 642 "of base library DLL") \ 643 \ 644 develop(bool, InlineUnsafeOps, true, \ 645 "inline memory ops (native methods) from sun.misc.Unsafe") \ 646 \ 647 develop(bool, ConvertCmpD2CmpF, true, \ 648 "Convert cmpD to cmpF when one input is constant in float range") \ 649 \ 650 develop(bool, ConvertFloat2IntClipping, true, \ 651 "Convert float2int clipping idiom to integer clipping") \ 652 \ 653 develop(bool, SpecialStringCompareTo, true, \ 654 "special version of string compareTo") \ 655 \ 656 develop(bool, SpecialStringIndexOf, true, \ 657 "special version of string indexOf") \ 658 \ 659 develop(bool, SpecialStringEquals, true, \ 660 "special version of string equals") \ 661 \ 662 develop(bool, SpecialArraysEquals, true, \ 663 "special version of Arrays.equals(char[],char[])") \ 664 \ 665 product(bool, UseSSE42Intrinsics, false, \ 666 "SSE4.2 versions of intrinsics") \ 667 \ 668 product(bool, UseCondCardMark, false, \ 669 "Check for already marked card before updating card table") \ 670 \ 671 develop(bool, TraceCallFixup, false, \ 672 "traces all call fixups") \ 673 \ 674 develop(bool, DeoptimizeALot, false, \ 675 "deoptimize at every exit from the runtime system") \ 676 \ 677 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 678 "a comma separated list of bcis to deoptimize at") \ 679 \ 680 product(bool, DeoptimizeRandom, false, \ 681 "deoptimize random frames on random exit from the runtime system")\ 682 \ 683 notproduct(bool, ZombieALot, false, \ 684 "creates zombies (non-entrant) at exit from the runt. system") \ 685 \ 686 product(bool, UnlinkSymbolsALot, false, \ 687 "unlink unreferenced symbols from the symbol table at safepoints")\ 688 \ 689 notproduct(bool, WalkStackALot, false, \ 690 "trace stack (no print) at every exit from the runtime system") \ 691 \ 692 product(bool, Debugging, false, \ 693 "set when executing debug methods in debug.ccp " \ 694 "(to prevent triggering assertions)") \ 695 \ 696 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 697 "Enable strict checks that safepoints cannot happen for threads " \ 698 "that used No_Safepoint_Verifier") \ 699 \ 700 notproduct(bool, VerifyLastFrame, false, \ 701 "Verify oops on last frame on entry to VM") \ 702 \ 703 develop(bool, TraceHandleAllocation, false, \ 704 "Prints out warnings when suspicious many handles are allocated") \ 705 \ 706 product(bool, UseCompilerSafepoints, true, \ 707 "Stop at safepoints in compiled code") \ 708 \ 709 product(bool, UseSplitVerifier, true, \ 710 "use split verifier with StackMapTable attributes") \ 711 \ 712 product(bool, FailOverToOldVerifier, true, \ 713 "fail over to old verifier when split verifier fails") \ 714 \ 715 develop(bool, ShowSafepointMsgs, false, \ 716 "Show msg. about safepoint synch.") \ 717 \ 718 product(bool, SafepointTimeout, false, \ 719 "Time out and warn or fail after SafepointTimeoutDelay " \ 720 "milliseconds if failed to reach safepoint") \ 721 \ 722 develop(bool, DieOnSafepointTimeout, false, \ 723 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 724 \ 725 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 726 /* typically, at most a few retries are needed */ \ 727 product(intx, SuspendRetryCount, 50, \ 728 "Maximum retry count for an external suspend request") \ 729 \ 730 product(intx, SuspendRetryDelay, 5, \ 731 "Milliseconds to delay per retry (* current_retry_count)") \ 732 \ 733 product(bool, AssertOnSuspendWaitFailure, false, \ 734 "Assert/Guarantee on external suspend wait failure") \ 735 \ 736 product(bool, TraceSuspendWaitFailures, false, \ 737 "Trace external suspend wait failures") \ 738 \ 739 product(bool, MaxFDLimit, true, \ 740 "Bump the number of file descriptors to max in solaris.") \ 741 \ 742 notproduct(bool, LogEvents, trueInDebug, \ 743 "Enable Event log") \ 744 \ 745 product(bool, BytecodeVerificationRemote, true, \ 746 "Enables the Java bytecode verifier for remote classes") \ 747 \ 748 product(bool, BytecodeVerificationLocal, false, \ 749 "Enables the Java bytecode verifier for local classes") \ 750 \ 751 develop(bool, ForceFloatExceptions, trueInDebug, \ 752 "Force exceptions on FP stack under/overflow") \ 753 \ 754 develop(bool, SoftMatchFailure, trueInProduct, \ 755 "If the DFA fails to match a node, print a message and bail out") \ 756 \ 757 develop(bool, VerifyStackAtCalls, false, \ 758 "Verify that the stack pointer is unchanged after calls") \ 759 \ 760 develop(bool, TraceJavaAssertions, false, \ 761 "Trace java language assertions") \ 762 \ 763 notproduct(bool, CheckAssertionStatusDirectives, false, \ 764 "temporary - see javaClasses.cpp") \ 765 \ 766 notproduct(bool, PrintMallocFree, false, \ 767 "Trace calls to C heap malloc/free allocation") \ 768 \ 769 product(bool, PrintOopAddress, false, \ 770 "Always print the location of the oop") \ 771 \ 772 notproduct(bool, VerifyCodeCacheOften, false, \ 773 "Verify compiled-code cache often") \ 774 \ 775 develop(bool, ZapDeadCompiledLocals, false, \ 776 "Zap dead locals in compiler frames") \ 777 \ 778 notproduct(bool, ZapDeadLocalsOld, false, \ 779 "Zap dead locals (old version, zaps all frames when " \ 780 "entering the VM") \ 781 \ 782 notproduct(bool, CheckOopishValues, false, \ 783 "Warn if value contains oop ( requires ZapDeadLocals)") \ 784 \ 785 develop(bool, UseMallocOnly, false, \ 786 "use only malloc/free for allocation (no resource area/arena)") \ 787 \ 788 develop(bool, PrintMalloc, false, \ 789 "print all malloc/free calls") \ 790 \ 791 develop(bool, PrintMallocStatistics, false, \ 792 "print malloc/free statistics") \ 793 \ 794 develop(bool, ZapResourceArea, trueInDebug, \ 795 "Zap freed resource/arena space with 0xABABABAB") \ 796 \ 797 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 798 "Zap freed VM handle space with 0xBCBCBCBC") \ 799 \ 800 develop(bool, ZapJNIHandleArea, trueInDebug, \ 801 "Zap freed JNI handle space with 0xFEFEFEFE") \ 802 \ 803 notproduct(bool, ZapStackSegments, trueInDebug, \ 804 "Zap allocated/freed Stack segments with 0xFADFADED") \ 805 \ 806 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 807 "Zap unused heap space with 0xBAADBABE") \ 808 \ 809 develop(bool, TraceZapUnusedHeapArea, false, \ 810 "Trace zapping of unused heap space") \ 811 \ 812 develop(bool, CheckZapUnusedHeapArea, false, \ 813 "Check zapping of unused heap space") \ 814 \ 815 develop(bool, ZapFillerObjects, trueInDebug, \ 816 "Zap filler objects with 0xDEAFBABE") \ 817 \ 818 develop(bool, PrintVMMessages, true, \ 819 "Print vm messages on console") \ 820 \ 821 product(bool, PrintGCApplicationConcurrentTime, false, \ 822 "Print the time the application has been running") \ 823 \ 824 product(bool, PrintGCApplicationStoppedTime, false, \ 825 "Print the time the application has been stopped") \ 826 \ 827 notproduct(uintx, ErrorHandlerTest, 0, \ 828 "If > 0, provokes an error after VM initialization; the value" \ 829 "determines which error to provoke. See test_error_handler()" \ 830 "in debug.cpp.") \ 831 \ 832 develop(bool, Verbose, false, \ 833 "Prints additional debugging information from other modes") \ 834 \ 835 develop(bool, PrintMiscellaneous, false, \ 836 "Prints uncategorized debugging information (requires +Verbose)") \ 837 \ 838 develop(bool, WizardMode, false, \ 839 "Prints much more debugging information") \ 840 \ 841 product(bool, ShowMessageBoxOnError, false, \ 842 "Keep process alive on VM fatal error") \ 843 \ 844 product(bool, CreateMinidumpOnCrash, false, \ 845 "Create minidump on VM fatal error") \ 846 \ 847 product_pd(bool, UseOSErrorReporting, \ 848 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 849 \ 850 product(bool, SuppressFatalErrorMessage, false, \ 851 "Do NO Fatal Error report [Avoid deadlock]") \ 852 \ 853 product(ccstrlist, OnError, "", \ 854 "Run user-defined commands on fatal error; see VMError.cpp " \ 855 "for examples") \ 856 \ 857 product(ccstrlist, OnOutOfMemoryError, "", \ 858 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 859 \ 860 manageable(bool, HeapDumpBeforeFullGC, false, \ 861 "Dump heap to file before any major stop-world GC") \ 862 \ 863 manageable(bool, HeapDumpAfterFullGC, false, \ 864 "Dump heap to file after any major stop-world GC") \ 865 \ 866 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 867 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 868 \ 869 manageable(ccstr, HeapDumpPath, NULL, \ 870 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 871 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 872 "in the working directory)") \ 873 \ 874 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 875 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 876 "when the heap usage is larger than this") \ 877 \ 878 develop(uintx, HeapDumpSegmentSize, 1*G, \ 879 "Approximate segment size when generating a segmented heap dump") \ 880 \ 881 develop(bool, BreakAtWarning, false, \ 882 "Execute breakpoint upon encountering VM warning") \ 883 \ 884 product_pd(bool, UseVectoredExceptions, \ 885 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 886 \ 887 develop(bool, TraceVMOperation, false, \ 888 "Trace vm operations") \ 889 \ 890 develop(bool, UseFakeTimers, false, \ 891 "Tells whether the VM should use system time or a fake timer") \ 892 \ 893 diagnostic(bool, LogCompilation, false, \ 894 "Log compilation activity in detail to hotspot.log or LogFile") \ 895 \ 896 product(bool, PrintCompilation, false, \ 897 "Print compilations") \ 898 \ 899 diagnostic(bool, TraceNMethodInstalls, false, \ 900 "Trace nmethod intallation") \ 901 \ 902 diagnostic(intx, ScavengeRootsInCode, 1, \ 903 "0: do not allow scavengable oops in the code cache; " \ 904 "1: allow scavenging from the code cache; " \ 905 "2: emit as many constants as the compiler can see") \ 906 \ 907 diagnostic(bool, TraceOSRBreakpoint, false, \ 908 "Trace OSR Breakpoint ") \ 909 \ 910 diagnostic(bool, TraceCompileTriggered, false, \ 911 "Trace compile triggered") \ 912 \ 913 diagnostic(bool, TraceTriggers, false, \ 914 "Trace triggers") \ 915 \ 916 product(bool, AlwaysRestoreFPU, false, \ 917 "Restore the FPU control word after every JNI call (expensive)") \ 918 \ 919 diagnostic(bool, PrintCompilation2, false, \ 920 "Print additional statistics per compilation") \ 921 \ 922 diagnostic(bool, PrintAdapterHandlers, false, \ 923 "Print code generated for i2c/c2i adapters") \ 924 \ 925 develop(bool, VerifyAdapterSharing, false, \ 926 "Verify that the code for shared adapters is the equivalent") \ 927 \ 928 diagnostic(bool, PrintAssembly, false, \ 929 "Print assembly code (using external disassembler.so)") \ 930 \ 931 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 932 "Options string passed to disassembler.so") \ 933 \ 934 diagnostic(bool, PrintNMethods, false, \ 935 "Print assembly code for nmethods when generated") \ 936 \ 937 diagnostic(bool, PrintNativeNMethods, false, \ 938 "Print assembly code for native nmethods when generated") \ 939 \ 940 develop(bool, PrintDebugInfo, false, \ 941 "Print debug information for all nmethods when generated") \ 942 \ 943 develop(bool, PrintRelocations, false, \ 944 "Print relocation information for all nmethods when generated") \ 945 \ 946 develop(bool, PrintDependencies, false, \ 947 "Print dependency information for all nmethods when generated") \ 948 \ 949 develop(bool, PrintExceptionHandlers, false, \ 950 "Print exception handler tables for all nmethods when generated") \ 951 \ 952 develop(bool, InterceptOSException, false, \ 953 "Starts debugger when an implicit OS (e.g., NULL) " \ 954 "exception happens") \ 955 \ 956 notproduct(bool, PrintCodeCache, false, \ 957 "Print the compiled_code cache when exiting") \ 958 \ 959 develop(bool, PrintCodeCache2, false, \ 960 "Print detailed info on the compiled_code cache when exiting") \ 961 \ 962 diagnostic(bool, PrintStubCode, false, \ 963 "Print generated stub code") \ 964 \ 965 product(bool, StackTraceInThrowable, true, \ 966 "Collect backtrace in throwable when exception happens") \ 967 \ 968 product(bool, OmitStackTraceInFastThrow, true, \ 969 "Omit backtraces for some 'hot' exceptions in optimized code") \ 970 \ 971 product(bool, ProfilerPrintByteCodeStatistics, false, \ 972 "Prints byte code statictics when dumping profiler output") \ 973 \ 974 product(bool, ProfilerRecordPC, false, \ 975 "Collects tick for each 16 byte interval of compiled code") \ 976 \ 977 product(bool, ProfileVM, false, \ 978 "Profiles ticks that fall within VM (either in the VM Thread " \ 979 "or VM code called through stubs)") \ 980 \ 981 product(bool, ProfileIntervals, false, \ 982 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 983 \ 984 notproduct(bool, ProfilerCheckIntervals, false, \ 985 "Collect and print info on spacing of profiler ticks") \ 986 \ 987 develop(bool, PrintJVMWarnings, false, \ 988 "Prints warnings for unimplemented JVM functions") \ 989 \ 990 product(bool, PrintWarnings, true, \ 991 "Prints JVM warnings to output stream") \ 992 \ 993 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 994 "Prints warnings for stalled SpinLocks") \ 995 \ 996 develop(bool, InitializeJavaLangSystem, true, \ 997 "Initialize java.lang.System - turn off for individual " \ 998 "method debugging") \ 999 \ 1000 develop(bool, InitializeJavaLangString, true, \ 1001 "Initialize java.lang.String - turn off for individual " \ 1002 "method debugging") \ 1003 \ 1004 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 1005 "Initialize various error and exception classes - turn off for " \ 1006 "individual method debugging") \ 1007 \ 1008 product(bool, RegisterFinalizersAtInit, true, \ 1009 "Register finalizable objects at end of Object.<init> or " \ 1010 "after allocation") \ 1011 \ 1012 develop(bool, RegisterReferences, true, \ 1013 "Tells whether the VM should register soft/weak/final/phantom " \ 1014 "references") \ 1015 \ 1016 develop(bool, IgnoreRewrites, false, \ 1017 "Supress rewrites of bytecodes in the oopmap generator. " \ 1018 "This is unsafe!") \ 1019 \ 1020 develop(bool, PrintCodeCacheExtension, false, \ 1021 "Print extension of code cache") \ 1022 \ 1023 develop(bool, UsePrivilegedStack, true, \ 1024 "Enable the security JVM functions") \ 1025 \ 1026 develop(bool, IEEEPrecision, true, \ 1027 "Enables IEEE precision (for INTEL only)") \ 1028 \ 1029 develop(bool, ProtectionDomainVerification, true, \ 1030 "Verifies protection domain before resolution in system " \ 1031 "dictionary") \ 1032 \ 1033 product(bool, ClassUnloading, true, \ 1034 "Do unloading of classes") \ 1035 \ 1036 diagnostic(bool, LinkWellKnownClasses, false, \ 1037 "Resolve a well known class as soon as its name is seen") \ 1038 \ 1039 develop(bool, DisableStartThread, false, \ 1040 "Disable starting of additional Java threads " \ 1041 "(for debugging only)") \ 1042 \ 1043 develop(bool, MemProfiling, false, \ 1044 "Write memory usage profiling to log file") \ 1045 \ 1046 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1047 "Prints the system dictionary at exit") \ 1048 \ 1049 diagnostic(bool, UnsyncloadClass, false, \ 1050 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1051 "class loader must call VM synchronized for findClass " \ 1052 "and defineClass.") \ 1053 \ 1054 product(bool, AlwaysLockClassLoader, false, \ 1055 "Require the VM to acquire the class loader lock before calling " \ 1056 "loadClass() even for class loaders registering " \ 1057 "as parallel capable") \ 1058 \ 1059 product(bool, AllowParallelDefineClass, false, \ 1060 "Allow parallel defineClass requests for class loaders " \ 1061 "registering as parallel capable") \ 1062 \ 1063 product(bool, MustCallLoadClassInternal, false, \ 1064 "Call loadClassInternal() rather than loadClass()") \ 1065 \ 1066 product_pd(bool, DontYieldALot, \ 1067 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1068 \ 1069 product_pd(bool, ConvertSleepToYield, \ 1070 "Converts sleep(0) to thread yield " \ 1071 "(may be off for SOLARIS to improve GUI)") \ 1072 \ 1073 product(bool, ConvertYieldToSleep, false, \ 1074 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1075 "behavior (SOLARIS only)") \ 1076 \ 1077 product(bool, UseBoundThreads, true, \ 1078 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1079 \ 1080 develop(bool, UseDetachedThreads, true, \ 1081 "Use detached threads that are recycled upon termination " \ 1082 "(for SOLARIS only)") \ 1083 \ 1084 product(bool, UseLWPSynchronization, true, \ 1085 "Use LWP-based instead of libthread-based synchronization " \ 1086 "(SPARC only)") \ 1087 \ 1088 product(ccstr, SyncKnobs, NULL, \ 1089 "(Unstable) Various monitor synchronization tunables") \ 1090 \ 1091 product(intx, EmitSync, 0, \ 1092 "(Unsafe,Unstable) " \ 1093 " Controls emission of inline sync fast-path code") \ 1094 \ 1095 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1096 \ 1097 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1098 \ 1099 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1100 \ 1101 product(intx, Atomics, 0, \ 1102 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1103 \ 1104 product(intx, FenceInstruction, 0, \ 1105 "(Unsafe,Unstable) Experimental") \ 1106 \ 1107 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1108 \ 1109 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1110 \ 1111 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1112 \ 1113 product(intx, hashCode, 0, \ 1114 "(Unstable) select hashCode generation algorithm" ) \ 1115 \ 1116 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1117 "(Unstable, Linux-specific)" \ 1118 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1119 \ 1120 product(bool, FilterSpuriousWakeups, true, \ 1121 "Prevent spurious or premature wakeups from object.wait " \ 1122 "(Solaris only)") \ 1123 \ 1124 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1125 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1126 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1127 \ 1128 develop(bool, UsePthreads, false, \ 1129 "Use pthread-based instead of libthread-based synchronization " \ 1130 "(SPARC only)") \ 1131 \ 1132 product(bool, AdjustConcurrency, false, \ 1133 "call thr_setconcurrency at thread create time to avoid " \ 1134 "LWP starvation on MP systems (For Solaris Only)") \ 1135 \ 1136 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1137 "Should the system attempt to update the compiler file when " \ 1138 "an error occurs?") \ 1139 \ 1140 product(bool, ReduceSignalUsage, false, \ 1141 "Reduce the use of OS signals in Java and/or the VM") \ 1142 \ 1143 notproduct(bool, ValidateMarkSweep, false, \ 1144 "Do extra validation during MarkSweep collection") \ 1145 \ 1146 notproduct(bool, RecordMarkSweepCompaction, false, \ 1147 "Enable GC-to-GC recording and querying of compaction during " \ 1148 "MarkSweep") \ 1149 \ 1150 develop_pd(bool, ShareVtableStubs, \ 1151 "Share vtable stubs (smaller code but worse branch prediction") \ 1152 \ 1153 develop(bool, LoadLineNumberTables, true, \ 1154 "Tells whether the class file parser loads line number tables") \ 1155 \ 1156 develop(bool, LoadLocalVariableTables, true, \ 1157 "Tells whether the class file parser loads local variable tables")\ 1158 \ 1159 develop(bool, LoadLocalVariableTypeTables, true, \ 1160 "Tells whether the class file parser loads local variable type tables")\ 1161 \ 1162 product(bool, AllowUserSignalHandlers, false, \ 1163 "Do not complain if the application installs signal handlers " \ 1164 "(Solaris & Linux only)") \ 1165 \ 1166 product(bool, UseSignalChaining, true, \ 1167 "Use signal-chaining to invoke signal handlers installed " \ 1168 "by the application (Solaris & Linux only)") \ 1169 \ 1170 product(bool, UseAltSigs, false, \ 1171 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1172 "internal signals (Solaris only)") \ 1173 \ 1174 product(bool, UseSpinning, false, \ 1175 "Use spinning in monitor inflation and before entry") \ 1176 \ 1177 product(bool, PreSpinYield, false, \ 1178 "Yield before inner spinning loop") \ 1179 \ 1180 product(bool, PostSpinYield, true, \ 1181 "Yield after inner spinning loop") \ 1182 \ 1183 product(bool, AllowJNIEnvProxy, false, \ 1184 "Allow JNIEnv proxies for jdbx") \ 1185 \ 1186 product(bool, JNIDetachReleasesMonitors, true, \ 1187 "JNI DetachCurrentThread releases monitors owned by thread") \ 1188 \ 1189 product(bool, RestoreMXCSROnJNICalls, false, \ 1190 "Restore MXCSR when returning from JNI calls") \ 1191 \ 1192 product(bool, CheckJNICalls, false, \ 1193 "Verify all arguments to JNI calls") \ 1194 \ 1195 product(bool, UseFastJNIAccessors, true, \ 1196 "Use optimized versions of Get<Primitive>Field") \ 1197 \ 1198 product(bool, EagerXrunInit, false, \ 1199 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1200 " but not all -Xrun libraries may support the state of the VM at this time") \ 1201 \ 1202 product(bool, PreserveAllAnnotations, false, \ 1203 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1204 \ 1205 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1206 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1207 \ 1208 product(bool, LazyBootClassLoader, true, \ 1209 "Enable/disable lazy opening of boot class path entries") \ 1210 \ 1211 diagnostic(bool, UseIncDec, true, \ 1212 "Use INC, DEC instructions on x86") \ 1213 \ 1214 product(bool, UseNewLongLShift, false, \ 1215 "Use optimized bitwise shift left") \ 1216 \ 1217 product(bool, UseStoreImmI16, true, \ 1218 "Use store immediate 16-bits value instruction on x86") \ 1219 \ 1220 product(bool, UseAddressNop, false, \ 1221 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1222 \ 1223 product(bool, UseXmmLoadAndClearUpper, true, \ 1224 "Load low part of XMM register and clear upper part") \ 1225 \ 1226 product(bool, UseXmmRegToRegMoveAll, false, \ 1227 "Copy all XMM register bits when moving value between registers") \ 1228 \ 1229 product(bool, UseXmmI2D, false, \ 1230 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1231 \ 1232 product(bool, UseXmmI2F, false, \ 1233 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1234 \ 1235 product(bool, UseXMMForArrayCopy, false, \ 1236 "Use SSE2 MOVQ instruction for Arraycopy") \ 1237 \ 1238 product(bool, UseUnalignedLoadStores, false, \ 1239 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1240 \ 1241 product(bool, UseCBCond, false, \ 1242 "Use compare and branch instruction on SPARC") \ 1243 \ 1244 product(intx, FieldsAllocationStyle, 1, \ 1245 "0 - type based with oops first, 1 - with oops last, " \ 1246 "2 - oops in super and sub classes are together") \ 1247 \ 1248 product(bool, CompactFields, true, \ 1249 "Allocate nonstatic fields in gaps between previous fields") \ 1250 \ 1251 notproduct(bool, PrintCompactFieldsSavings, false, \ 1252 "Print how many words were saved with CompactFields") \ 1253 \ 1254 product(bool, UseBiasedLocking, true, \ 1255 "Enable biased locking in JVM") \ 1256 \ 1257 product(intx, BiasedLockingStartupDelay, 4000, \ 1258 "Number of milliseconds to wait before enabling biased locking") \ 1259 \ 1260 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1261 "Print statistics of biased locking in JVM") \ 1262 \ 1263 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1264 "Threshold of number of revocations per type to try to " \ 1265 "rebias all objects in the heap of that type") \ 1266 \ 1267 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1268 "Threshold of number of revocations per type to permanently " \ 1269 "revoke biases of all objects in the heap of that type") \ 1270 \ 1271 product(intx, BiasedLockingDecayTime, 25000, \ 1272 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1273 "type after previous bulk rebias") \ 1274 \ 1275 develop(bool, JavaObjectsInPerm, false, \ 1276 "controls whether Classes and interned Strings are allocated" \ 1277 "in perm. This purely intended to allow debugging issues" \ 1278 "in production.") \ 1279 \ 1280 /* tracing */ \ 1281 \ 1282 notproduct(bool, TraceRuntimeCalls, false, \ 1283 "Trace run-time calls") \ 1284 \ 1285 develop(bool, TraceJNICalls, false, \ 1286 "Trace JNI calls") \ 1287 \ 1288 notproduct(bool, TraceJVMCalls, false, \ 1289 "Trace JVM calls") \ 1290 \ 1291 product(ccstr, TraceJVMTI, NULL, \ 1292 "Trace flags for JVMTI functions and events") \ 1293 \ 1294 /* This option can change an EMCP method into an obsolete method. */ \ 1295 /* This can affect tests that except specific methods to be EMCP. */ \ 1296 /* This option should be used with caution. */ \ 1297 product(bool, StressLdcRewrite, false, \ 1298 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1299 \ 1300 product(intx, TraceRedefineClasses, 0, \ 1301 "Trace level for JVMTI RedefineClasses") \ 1302 \ 1303 develop(bool, StressMethodComparator, false, \ 1304 "run the MethodComparator on all loaded methods") \ 1305 \ 1306 /* change to false by default sometime after Mustang */ \ 1307 product(bool, VerifyMergedCPBytecodes, true, \ 1308 "Verify bytecodes after RedefineClasses constant pool merging") \ 1309 \ 1310 develop(bool, TraceJNIHandleAllocation, false, \ 1311 "Trace allocation/deallocation of JNI handle blocks") \ 1312 \ 1313 develop(bool, TraceThreadEvents, false, \ 1314 "Trace all thread events") \ 1315 \ 1316 develop(bool, TraceBytecodes, false, \ 1317 "Trace bytecode execution") \ 1318 \ 1319 develop(bool, TraceClassInitialization, false, \ 1320 "Trace class initialization") \ 1321 \ 1322 develop(bool, TraceExceptions, false, \ 1323 "Trace exceptions") \ 1324 \ 1325 develop(bool, TraceICs, false, \ 1326 "Trace inline cache changes") \ 1327 \ 1328 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1329 "Trace method invocation counter overflow") \ 1330 \ 1331 develop(bool, TraceInlineCacheClearing, false, \ 1332 "Trace clearing of inline caches in nmethods") \ 1333 \ 1334 develop(bool, TraceDependencies, false, \ 1335 "Trace dependencies") \ 1336 \ 1337 develop(bool, VerifyDependencies, trueInDebug, \ 1338 "Exercise and verify the compilation dependency mechanism") \ 1339 \ 1340 develop(bool, TraceNewOopMapGeneration, false, \ 1341 "Trace OopMapGeneration") \ 1342 \ 1343 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1344 "Trace OopMapGeneration: print detailed cell states") \ 1345 \ 1346 develop(bool, TimeOopMap, false, \ 1347 "Time calls to GenerateOopMap::compute_map() in sum") \ 1348 \ 1349 develop(bool, TimeOopMap2, false, \ 1350 "Time calls to GenerateOopMap::compute_map() individually") \ 1351 \ 1352 develop(bool, TraceMonitorMismatch, false, \ 1353 "Trace monitor matching failures during OopMapGeneration") \ 1354 \ 1355 develop(bool, TraceOopMapRewrites, false, \ 1356 "Trace rewritting of method oops during oop map generation") \ 1357 \ 1358 develop(bool, TraceSafepoint, false, \ 1359 "Trace safepoint operations") \ 1360 \ 1361 develop(bool, TraceICBuffer, false, \ 1362 "Trace usage of IC buffer") \ 1363 \ 1364 develop(bool, TraceCompiledIC, false, \ 1365 "Trace changes of compiled IC") \ 1366 \ 1367 notproduct(bool, TraceZapDeadLocals, false, \ 1368 "Trace zapping dead locals") \ 1369 \ 1370 develop(bool, TraceStartupTime, false, \ 1371 "Trace setup time") \ 1372 \ 1373 product(ccstr, HPILibPath, NULL, \ 1374 "Specify alternate path to HPI library") \ 1375 \ 1376 develop(bool, TraceProtectionDomainVerification, false, \ 1377 "Trace protection domain verifcation") \ 1378 \ 1379 develop(bool, TraceClearedExceptions, false, \ 1380 "Prints when an exception is forcibly cleared") \ 1381 \ 1382 product(bool, TraceClassResolution, false, \ 1383 "Trace all constant pool resolutions (for debugging)") \ 1384 \ 1385 product(bool, TraceBiasedLocking, false, \ 1386 "Trace biased locking in JVM") \ 1387 \ 1388 product(bool, TraceMonitorInflation, false, \ 1389 "Trace monitor inflation in JVM") \ 1390 \ 1391 /* assembler */ \ 1392 product(bool, Use486InstrsOnly, false, \ 1393 "Use 80486 Compliant instruction subset") \ 1394 \ 1395 /* gc */ \ 1396 \ 1397 product(bool, UseSerialGC, false, \ 1398 "Use the serial garbage collector") \ 1399 \ 1400 product(bool, UseG1GC, false, \ 1401 "Use the Garbage-First garbage collector") \ 1402 \ 1403 product(bool, UseParallelGC, false, \ 1404 "Use the Parallel Scavenge garbage collector") \ 1405 \ 1406 product(bool, UseParallelOldGC, false, \ 1407 "Use the Parallel Old garbage collector") \ 1408 \ 1409 product(uintx, HeapMaximumCompactionInterval, 20, \ 1410 "How often should we maximally compact the heap (not allowing " \ 1411 "any dead space)") \ 1412 \ 1413 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1414 "The collection count for the first maximum compaction") \ 1415 \ 1416 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1417 "In the Parallel Old garbage collector maximum compaction for " \ 1418 "a system GC") \ 1419 \ 1420 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1421 "The mean used by the par compact dead wood" \ 1422 "limiter (a number between 0-100).") \ 1423 \ 1424 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1425 "The standard deviation used by the par compact dead wood" \ 1426 "limiter (a number between 0-100).") \ 1427 \ 1428 product(uintx, ParallelGCThreads, 0, \ 1429 "Number of parallel threads parallel gc will use") \ 1430 \ 1431 develop(bool, ParallelOldGCSplitALot, false, \ 1432 "Provoke splitting (copying data from a young gen space to" \ 1433 "multiple destination spaces)") \ 1434 \ 1435 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1436 "How often to provoke splitting a young gen space") \ 1437 \ 1438 develop(bool, TraceRegionTasksQueuing, false, \ 1439 "Trace the queuing of the region tasks") \ 1440 \ 1441 product(uintx, ConcGCThreads, 0, \ 1442 "Number of threads concurrent gc will use") \ 1443 \ 1444 product(uintx, YoungPLABSize, 4096, \ 1445 "Size of young gen promotion labs (in HeapWords)") \ 1446 \ 1447 product(uintx, OldPLABSize, 1024, \ 1448 "Size of old gen promotion labs (in HeapWords)") \ 1449 \ 1450 product(uintx, GCTaskTimeStampEntries, 200, \ 1451 "Number of time stamp entries per gc worker thread") \ 1452 \ 1453 product(bool, AlwaysTenure, false, \ 1454 "Always tenure objects in eden. (ParallelGC only)") \ 1455 \ 1456 product(bool, NeverTenure, false, \ 1457 "Never tenure objects in eden, May tenure on overflow " \ 1458 "(ParallelGC only)") \ 1459 \ 1460 product(bool, ScavengeBeforeFullGC, true, \ 1461 "Scavenge youngest generation before each full GC, " \ 1462 "used with UseParallelGC") \ 1463 \ 1464 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1465 "Allow scavenges to occur when to_space contains objects.") \ 1466 \ 1467 product(bool, UseConcMarkSweepGC, false, \ 1468 "Use Concurrent Mark-Sweep GC in the old generation") \ 1469 \ 1470 product(bool, ExplicitGCInvokesConcurrent, false, \ 1471 "A System.gc() request invokes a concurrent collection;" \ 1472 " (effective only when UseConcMarkSweepGC)") \ 1473 \ 1474 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1475 "A System.gc() request invokes a concurrent collection and " \ 1476 "also unloads classes during such a concurrent gc cycle " \ 1477 "(effective only when UseConcMarkSweepGC)") \ 1478 \ 1479 product(bool, GCLockerInvokesConcurrent, false, \ 1480 "The exit of a JNI CS necessitating a scavenge also" \ 1481 " kicks off a bkgrd concurrent collection") \ 1482 \ 1483 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1484 "How much the GC can expand the eden by while the GC locker " \ 1485 "is active (as a percentage)") \ 1486 \ 1487 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1488 "Use Adaptive Free Lists in the CMS generation") \ 1489 \ 1490 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1491 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1492 \ 1493 develop(bool, RotateCMSCollectionTypes, false, \ 1494 "Rotate the CMS collections among concurrent and STW") \ 1495 \ 1496 product(bool, UseCMSBestFit, true, \ 1497 "Use CMS best fit allocation strategy") \ 1498 \ 1499 product(bool, UseCMSCollectionPassing, true, \ 1500 "Use passing of collection from background to foreground") \ 1501 \ 1502 product(bool, UseParNewGC, false, \ 1503 "Use parallel threads in the new generation.") \ 1504 \ 1505 product(bool, ParallelGCVerbose, false, \ 1506 "Verbose output for parallel GC.") \ 1507 \ 1508 product(intx, ParallelGCBufferWastePct, 10, \ 1509 "wasted fraction of parallel allocation buffer.") \ 1510 \ 1511 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1512 "Retain parallel allocation buffers across scavenges; " \ 1513 " -- disabled because this currently conflicts with " \ 1514 " parallel card scanning under certain conditions ") \ 1515 \ 1516 product(intx, TargetPLABWastePct, 10, \ 1517 "target wasted space in last buffer as pct of overall allocation")\ 1518 \ 1519 product(uintx, PLABWeight, 75, \ 1520 "Percentage (0-100) used to weight the current sample when" \ 1521 "computing exponentially decaying average for ResizePLAB.") \ 1522 \ 1523 product(bool, ResizePLAB, true, \ 1524 "Dynamically resize (survivor space) promotion labs") \ 1525 \ 1526 product(bool, PrintPLAB, false, \ 1527 "Print (survivor space) promotion labs sizing decisions") \ 1528 \ 1529 product(intx, ParGCArrayScanChunk, 50, \ 1530 "Scan a subset and push remainder, if array is bigger than this") \ 1531 \ 1532 product(bool, ParGCUseLocalOverflow, false, \ 1533 "Instead of a global overflow list, use local overflow stacks") \ 1534 \ 1535 product(bool, ParGCTrimOverflow, true, \ 1536 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1537 \ 1538 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1539 "Whether we should simulate work queue overflow in ParNew") \ 1540 \ 1541 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1542 "An `interval' counter that determines how frequently " \ 1543 "we simulate overflow; a smaller number increases frequency") \ 1544 \ 1545 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1546 "The desired number of objects to claim from the overflow list") \ 1547 \ 1548 diagnostic(intx, ParGCStridesPerThread, 2, \ 1549 "The number of strides per worker thread that we divide up the " \ 1550 "card table scanning work into") \ 1551 \ 1552 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1553 "The number of cards in each chunk of the parallel chunks used " \ 1554 "during card table scanning") \ 1555 \ 1556 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1557 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1558 "parallel GC.") \ 1559 \ 1560 product(uintx, OldPLABWeight, 50, \ 1561 "Percentage (0-100) used to weight the current sample when" \ 1562 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1563 \ 1564 product(bool, ResizeOldPLAB, true, \ 1565 "Dynamically resize (old gen) promotion labs") \ 1566 \ 1567 product(bool, PrintOldPLAB, false, \ 1568 "Print (old gen) promotion labs sizing decisions") \ 1569 \ 1570 product(uintx, CMSOldPLABMin, 16, \ 1571 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1572 \ 1573 product(uintx, CMSOldPLABMax, 1024, \ 1574 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1575 \ 1576 product(uintx, CMSOldPLABNumRefills, 4, \ 1577 "Nominal number of refills of CMS gen promotion lab cache" \ 1578 " per worker per block size") \ 1579 \ 1580 product(bool, CMSOldPLABResizeQuicker, false, \ 1581 "Whether to react on-the-fly during a scavenge to a sudden" \ 1582 " change in block demand rate") \ 1583 \ 1584 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1585 "The tolerance of the phase-change detector for on-the-fly" \ 1586 " PLAB resizing during a scavenge") \ 1587 \ 1588 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1589 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1590 " during a scavenge") \ 1591 \ 1592 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1593 "The clamping of the gain in the feedback loop for on-the-fly" \ 1594 " PLAB resizing during a scavenge") \ 1595 \ 1596 product(bool, AlwaysPreTouch, false, \ 1597 "It forces all freshly committed pages to be pre-touched.") \ 1598 \ 1599 product_pd(intx, CMSYoungGenPerWorker, \ 1600 "The maximum size of young gen chosen by default per GC worker " \ 1601 "thread available") \ 1602 \ 1603 product(bool, GCOverheadReporting, false, \ 1604 "Enables the GC overhead reporting facility") \ 1605 \ 1606 product(intx, GCOverheadReportingPeriodMS, 100, \ 1607 "Reporting period for conc GC overhead reporting, in ms ") \ 1608 \ 1609 product(bool, CMSIncrementalMode, false, \ 1610 "Whether CMS GC should operate in \"incremental\" mode") \ 1611 \ 1612 product(uintx, CMSIncrementalDutyCycle, 10, \ 1613 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1614 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1615 "value") \ 1616 \ 1617 product(bool, CMSIncrementalPacing, true, \ 1618 "Whether the CMS incremental mode duty cycle should be " \ 1619 "automatically adjusted") \ 1620 \ 1621 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1622 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1623 "enabled (a percentage, 0-100)") \ 1624 \ 1625 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1626 "Percentage (0-100) used to add conservatism when computing the " \ 1627 "duty cycle") \ 1628 \ 1629 product(uintx, CMSIncrementalOffset, 0, \ 1630 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1631 " is shifted to the right within the period between young GCs") \ 1632 \ 1633 product(uintx, CMSExpAvgFactor, 50, \ 1634 "Percentage (0-100) used to weight the current sample when" \ 1635 "computing exponential averages for CMS statistics.") \ 1636 \ 1637 product(uintx, CMS_FLSWeight, 75, \ 1638 "Percentage (0-100) used to weight the current sample when" \ 1639 "computing exponentially decating averages for CMS FLS statistics.") \ 1640 \ 1641 product(uintx, CMS_FLSPadding, 1, \ 1642 "The multiple of deviation from mean to use for buffering" \ 1643 "against volatility in free list demand.") \ 1644 \ 1645 product(uintx, FLSCoalescePolicy, 2, \ 1646 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1647 \ 1648 product(bool, FLSAlwaysCoalesceLarge, false, \ 1649 "CMS: Larger free blocks are always available for coalescing") \ 1650 \ 1651 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1652 "CMS: the smaller the percentage the greater the coalition force")\ 1653 \ 1654 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1655 "CMS: the factor by which to inflate estimated demand of small" \ 1656 " block sizes to prevent coalescing with an adjoining block") \ 1657 \ 1658 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1659 "CMS: the factor by which to inflate estimated demand of large" \ 1660 " block sizes to prevent coalescing with an adjoining block") \ 1661 \ 1662 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1663 "CMS: the factor by which to inflate estimated demand of small" \ 1664 " block sizes to prevent splitting to supply demand for smaller" \ 1665 " blocks") \ 1666 \ 1667 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1668 "CMS: the factor by which to inflate estimated demand of large" \ 1669 " block sizes to prevent splitting to supply demand for smaller" \ 1670 " blocks") \ 1671 \ 1672 product(bool, CMSExtrapolateSweep, false, \ 1673 "CMS: cushion for block demand during sweep") \ 1674 \ 1675 product(uintx, CMS_SweepWeight, 75, \ 1676 "Percentage (0-100) used to weight the current sample when " \ 1677 "computing exponentially decaying average for inter-sweep " \ 1678 "duration") \ 1679 \ 1680 product(uintx, CMS_SweepPadding, 1, \ 1681 "The multiple of deviation from mean to use for buffering " \ 1682 "against volatility in inter-sweep duration.") \ 1683 \ 1684 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1685 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1686 "duration exceeds this threhold in milliseconds") \ 1687 \ 1688 develop(bool, CMSTraceIncrementalMode, false, \ 1689 "Trace CMS incremental mode") \ 1690 \ 1691 develop(bool, CMSTraceIncrementalPacing, false, \ 1692 "Trace CMS incremental mode pacing computation") \ 1693 \ 1694 develop(bool, CMSTraceThreadState, false, \ 1695 "Trace the CMS thread state (enable the trace_state() method)") \ 1696 \ 1697 product(bool, CMSClassUnloadingEnabled, false, \ 1698 "Whether class unloading enabled when using CMS GC") \ 1699 \ 1700 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1701 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1702 " for which classes may not be unloaded") \ 1703 \ 1704 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1705 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1706 \ 1707 product(bool, UseCMSCompactAtFullCollection, true, \ 1708 "Use mark sweep compact at full collections") \ 1709 \ 1710 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1711 "Number of CMS full collection done before compaction if > 0") \ 1712 \ 1713 develop(intx, CMSDictionaryChoice, 0, \ 1714 "Use BinaryTreeDictionary as default in the CMS generation") \ 1715 \ 1716 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1717 "Replenish an indexed free list with this number of chunks") \ 1718 \ 1719 product(bool, CMSReplenishIntermediate, true, \ 1720 "Replenish all intermediate free-list caches") \ 1721 \ 1722 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1723 "When satisfying batched demand, split blocks from the " \ 1724 "IndexedFreeList whose size is a multiple of requested size") \ 1725 \ 1726 product(bool, CMSLoopWarn, false, \ 1727 "Warn in case of excessive CMS looping") \ 1728 \ 1729 develop(bool, CMSOverflowEarlyRestoration, false, \ 1730 "Whether preserved marks should be restored early") \ 1731 \ 1732 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1733 "Size of marking stack") \ 1734 \ 1735 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1736 "Max size of marking stack") \ 1737 \ 1738 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1739 "Whether we should simulate frequent marking stack / work queue" \ 1740 " overflow") \ 1741 \ 1742 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1743 "An `interval' counter that determines how frequently" \ 1744 " we simulate overflow; a smaller number increases frequency") \ 1745 \ 1746 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1747 "(Temporary, subject to experimentation)" \ 1748 "Maximum number of abortable preclean iterations, if > 0") \ 1749 \ 1750 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1751 "(Temporary, subject to experimentation)" \ 1752 "Maximum time in abortable preclean in ms") \ 1753 \ 1754 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1755 "(Temporary, subject to experimentation)" \ 1756 "Nominal minimum work per abortable preclean iteration") \ 1757 \ 1758 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1759 "(Temporary, subject to experimentation)" \ 1760 " Time that we sleep between iterations when not given" \ 1761 " enough work per iteration") \ 1762 \ 1763 product(uintx, CMSRescanMultiple, 32, \ 1764 "Size (in cards) of CMS parallel rescan task") \ 1765 \ 1766 product(uintx, CMSConcMarkMultiple, 32, \ 1767 "Size (in cards) of CMS concurrent MT marking task") \ 1768 \ 1769 product(uintx, CMSRevisitStackSize, 1*M, \ 1770 "Size of CMS KlassKlass revisit stack") \ 1771 \ 1772 product(bool, CMSAbortSemantics, false, \ 1773 "Whether abort-on-overflow semantics is implemented") \ 1774 \ 1775 product(bool, CMSParallelRemarkEnabled, true, \ 1776 "Whether parallel remark enabled (only if ParNewGC)") \ 1777 \ 1778 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1779 "Whether parallel remark of survivor space" \ 1780 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1781 \ 1782 product(bool, CMSPLABRecordAlways, true, \ 1783 "Whether to always record survivor space PLAB bdries" \ 1784 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1785 \ 1786 product(bool, CMSConcurrentMTEnabled, true, \ 1787 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1788 \ 1789 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1790 "Whether concurrent precleaning enabled in perm gen" \ 1791 " (effective only when CMSPrecleaningEnabled is true)") \ 1792 \ 1793 product(bool, CMSPrecleaningEnabled, true, \ 1794 "Whether concurrent precleaning enabled") \ 1795 \ 1796 product(uintx, CMSPrecleanIter, 3, \ 1797 "Maximum number of precleaning iteration passes") \ 1798 \ 1799 product(uintx, CMSPrecleanNumerator, 2, \ 1800 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1801 " ratio") \ 1802 \ 1803 product(uintx, CMSPrecleanDenominator, 3, \ 1804 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1805 " ratio") \ 1806 \ 1807 product(bool, CMSPrecleanRefLists1, true, \ 1808 "Preclean ref lists during (initial) preclean phase") \ 1809 \ 1810 product(bool, CMSPrecleanRefLists2, false, \ 1811 "Preclean ref lists during abortable preclean phase") \ 1812 \ 1813 product(bool, CMSPrecleanSurvivors1, false, \ 1814 "Preclean survivors during (initial) preclean phase") \ 1815 \ 1816 product(bool, CMSPrecleanSurvivors2, true, \ 1817 "Preclean survivors during abortable preclean phase") \ 1818 \ 1819 product(uintx, CMSPrecleanThreshold, 1000, \ 1820 "Don't re-iterate if #dirty cards less than this") \ 1821 \ 1822 product(bool, CMSCleanOnEnter, true, \ 1823 "Clean-on-enter optimization for reducing number of dirty cards") \ 1824 \ 1825 product(uintx, CMSRemarkVerifyVariant, 1, \ 1826 "Choose variant (1,2) of verification following remark") \ 1827 \ 1828 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1829 "If Eden used is below this value, don't try to schedule remark") \ 1830 \ 1831 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1832 "The Eden occupancy % at which to try and schedule remark pause") \ 1833 \ 1834 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1835 "Start sampling Eden top at least before yg occupancy reaches" \ 1836 " 1/<ratio> of the size at which we plan to schedule remark") \ 1837 \ 1838 product(uintx, CMSSamplingGrain, 16*K, \ 1839 "The minimum distance between eden samples for CMS (see above)") \ 1840 \ 1841 product(bool, CMSScavengeBeforeRemark, false, \ 1842 "Attempt scavenge before the CMS remark step") \ 1843 \ 1844 develop(bool, CMSTraceSweeper, false, \ 1845 "Trace some actions of the CMS sweeper") \ 1846 \ 1847 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1848 "Don't drain below this size per parallel worker/thief") \ 1849 \ 1850 manageable(intx, CMSWaitDuration, 2000, \ 1851 "Time in milliseconds that CMS thread waits for young GC") \ 1852 \ 1853 product(bool, CMSYield, true, \ 1854 "Yield between steps of concurrent mark & sweep") \ 1855 \ 1856 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1857 "Bitmap operations should process at most this many bits" \ 1858 "between yields") \ 1859 \ 1860 product(bool, CMSDumpAtPromotionFailure, false, \ 1861 "Dump useful information about the state of the CMS old " \ 1862 " generation upon a promotion failure.") \ 1863 \ 1864 product(bool, CMSPrintChunksInDump, false, \ 1865 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1866 " more detailed information about the free chunks.") \ 1867 \ 1868 product(bool, CMSPrintObjectsInDump, false, \ 1869 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1870 " more detailed information about the allocated objects.") \ 1871 \ 1872 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1873 "Verify that all refs across the FLS boundary " \ 1874 " are to valid objects") \ 1875 \ 1876 diagnostic(bool, FLSVerifyLists, false, \ 1877 "Do lots of (expensive) FreeListSpace verification") \ 1878 \ 1879 diagnostic(bool, FLSVerifyIndexTable, false, \ 1880 "Do lots of (expensive) FLS index table verification") \ 1881 \ 1882 develop(bool, FLSVerifyDictionary, false, \ 1883 "Do lots of (expensive) FLS dictionary verification") \ 1884 \ 1885 develop(bool, VerifyBlockOffsetArray, false, \ 1886 "Do (expensive!) block offset array verification") \ 1887 \ 1888 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1889 "Maintain _unallocated_block in BlockOffsetArray" \ 1890 " (currently applicable only to CMS collector)") \ 1891 \ 1892 develop(bool, TraceCMSState, false, \ 1893 "Trace the state of the CMS collection") \ 1894 \ 1895 product(intx, RefDiscoveryPolicy, 0, \ 1896 "Whether reference-based(0) or referent-based(1)") \ 1897 \ 1898 product(bool, ParallelRefProcEnabled, false, \ 1899 "Enable parallel reference processing whenever possible") \ 1900 \ 1901 product(bool, ParallelRefProcBalancingEnabled, true, \ 1902 "Enable balancing of reference processing queues") \ 1903 \ 1904 product(intx, CMSTriggerRatio, 80, \ 1905 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1906 "allocated before a CMS collection cycle commences") \ 1907 \ 1908 product(intx, CMSTriggerPermRatio, 80, \ 1909 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1910 "is allocated before a CMS collection cycle commences, that " \ 1911 "also collects the perm generation") \ 1912 \ 1913 product(uintx, CMSBootstrapOccupancy, 50, \ 1914 "Percentage CMS generation occupancy at which to " \ 1915 "initiate CMS collection for bootstrapping collection stats") \ 1916 \ 1917 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1918 "Percentage CMS generation occupancy to start a CMS collection " \ 1919 "cycle. A negative value means that CMSTriggerRatio is used") \ 1920 \ 1921 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1922 "Percentage of the (entire) heap occupancy to start a " \ 1923 "concurrent GC cycle. It us used by GCs that trigger a " \ 1924 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1925 "not just one of the generations (e.g., G1). A value of 0 " \ 1926 "denotes 'do constant GC cycles'.") \ 1927 \ 1928 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1929 "Percentage CMS perm generation occupancy to start a " \ 1930 "CMScollection cycle. A negative value means that " \ 1931 "CMSTriggerPermRatio is used") \ 1932 \ 1933 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1934 "Only use occupancy as a crierion for starting a CMS collection") \ 1935 \ 1936 product(intx, CMSIsTooFullPercentage, 98, \ 1937 "An absolute ceiling above which CMS will always consider the " \ 1938 "perm gen ripe for collection") \ 1939 \ 1940 develop(bool, CMSTestInFreeList, false, \ 1941 "Check if the coalesced range is already in the " \ 1942 "free lists as claimed") \ 1943 \ 1944 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1945 "Check that all the garbage collected was returned to the " \ 1946 "free lists.") \ 1947 \ 1948 notproduct(bool, ScavengeALot, false, \ 1949 "Force scavenge at every Nth exit from the runtime system " \ 1950 "(N=ScavengeALotInterval)") \ 1951 \ 1952 develop(bool, FullGCALot, false, \ 1953 "Force full gc at every Nth exit from the runtime system " \ 1954 "(N=FullGCALotInterval)") \ 1955 \ 1956 notproduct(bool, GCALotAtAllSafepoints, false, \ 1957 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1958 \ 1959 product(bool, PrintPromotionFailure, false, \ 1960 "Print additional diagnostic information following " \ 1961 " promotion failure") \ 1962 \ 1963 notproduct(bool, PromotionFailureALot, false, \ 1964 "Use promotion failure handling on every youngest generation " \ 1965 "collection") \ 1966 \ 1967 develop(uintx, PromotionFailureALotCount, 1000, \ 1968 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1969 "refill attempts (ParNew) or promotion attempts " \ 1970 "(other young collectors) ") \ 1971 \ 1972 develop(uintx, PromotionFailureALotInterval, 5, \ 1973 "Total collections between promotion failures alot") \ 1974 \ 1975 experimental(intx, WorkStealingSleepMillis, 1, \ 1976 "Sleep time when sleep is used for yields") \ 1977 \ 1978 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1979 "Number of yields before a sleep is done during workstealing") \ 1980 \ 1981 experimental(uintx, WorkStealingHardSpins, 4096, \ 1982 "Number of iterations in a spin loop between checks on " \ 1983 "time out of hard spin") \ 1984 \ 1985 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1986 "Ratio of hard spins to calls to yield") \ 1987 \ 1988 product(uintx, PreserveMarkStackSize, 1024, \ 1989 "Size for stack used in promotion failure handling") \ 1990 \ 1991 develop(uintx, ObjArrayMarkingStride, 512, \ 1992 "Number of ObjArray elements to push onto the marking stack" \ 1993 "before pushing a continuation entry") \ 1994 \ 1995 notproduct(bool, ExecuteInternalVMTests, false, \ 1996 "Enable execution of internal VM tests.") \ 1997 \ 1998 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1999 \ 2000 product_pd(bool, ResizeTLAB, \ 2001 "Dynamically resize tlab size for threads") \ 2002 \ 2003 product(bool, ZeroTLAB, false, \ 2004 "Zero out the newly created TLAB") \ 2005 \ 2006 product(bool, FastTLABRefill, true, \ 2007 "Use fast TLAB refill code") \ 2008 \ 2009 product(bool, PrintTLAB, false, \ 2010 "Print various TLAB related information") \ 2011 \ 2012 product(bool, TLABStats, true, \ 2013 "Print various TLAB related information") \ 2014 \ 2015 product(bool, UseBlockZeroing, false, \ 2016 "Use special cpu instructions for block zeroing") \ 2017 \ 2018 product(intx, BlockZeroingLowLimit, 2048, \ 2019 "Minimum size in bytes when block zeroing will be used") \ 2020 \ 2021 product(bool, UseBlockCopy, false, \ 2022 "Use special cpu instructions for block copy") \ 2023 \ 2024 product(intx, BlockCopyLowLimit, 2048, \ 2025 "Minimum size in bytes when block copy will be used") \ 2026 \ 2027 product(bool, PrintRevisitStats, false, \ 2028 "Print revisit (klass and MDO) stack related information") \ 2029 \ 2030 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2031 "Enable LowMemoryProtection")) \ 2032 \ 2033 product_pd(bool, NeverActAsServerClassMachine, \ 2034 "Never act like a server-class machine") \ 2035 \ 2036 product(bool, AlwaysActAsServerClassMachine, false, \ 2037 "Always act like a server-class machine") \ 2038 \ 2039 product_pd(uint64_t, MaxRAM, \ 2040 "Real memory size (in bytes) used to set maximum heap size") \ 2041 \ 2042 product(uintx, ErgoHeapSizeLimit, 0, \ 2043 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2044 "MaxRAM / MaxRAMFraction") \ 2045 \ 2046 product(uintx, MaxRAMFraction, 4, \ 2047 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2048 "size") \ 2049 \ 2050 product(uintx, DefaultMaxRAMFraction, 4, \ 2051 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2052 "size; deprecated: to be renamed to MaxRAMFraction") \ 2053 \ 2054 product(uintx, MinRAMFraction, 2, \ 2055 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2056 "size on systems with small physical memory size") \ 2057 \ 2058 product(uintx, InitialRAMFraction, 64, \ 2059 "Fraction (1/n) of real memory used for initial heap size") \ 2060 \ 2061 product(bool, UseAutoGCSelectPolicy, false, \ 2062 "Use automatic collection selection policy") \ 2063 \ 2064 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2065 "Automatic GC selection pause threshhold in ms") \ 2066 \ 2067 product(bool, UseAdaptiveSizePolicy, true, \ 2068 "Use adaptive generation sizing policies") \ 2069 \ 2070 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2071 "Use adaptive survivor sizing policies") \ 2072 \ 2073 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2074 "Use adaptive young-old sizing policies at minor collections") \ 2075 \ 2076 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2077 "Use adaptive young-old sizing policies at major collections") \ 2078 \ 2079 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2080 "Use statistics from System.GC for adaptive size policy") \ 2081 \ 2082 product(bool, UseAdaptiveGCBoundary, false, \ 2083 "Allow young-old boundary to move") \ 2084 \ 2085 develop(bool, TraceAdaptiveGCBoundary, false, \ 2086 "Trace young-old boundary moves") \ 2087 \ 2088 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2089 "Resize the virtual spaces of the young or old generations") \ 2090 \ 2091 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2092 "Policy for changeing generation size for throughput goals") \ 2093 \ 2094 product(uintx, AdaptiveSizePausePolicy, 0, \ 2095 "Policy for changing generation size for pause goals") \ 2096 \ 2097 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2098 "Adjust tenured generation to achive a minor pause goal") \ 2099 \ 2100 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2101 "Adjust young generation to achive a major pause goal") \ 2102 \ 2103 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2104 "Number of steps where heuristics is used before data is used") \ 2105 \ 2106 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2107 "Number of collections before the adaptive sizing is started") \ 2108 \ 2109 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2110 "Collecton interval for printing information; zero => never") \ 2111 \ 2112 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2113 "Use adaptive minimum footprint as a goal") \ 2114 \ 2115 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2116 "Weight given to exponential resizing, between 0 and 100") \ 2117 \ 2118 product(uintx, AdaptiveTimeWeight, 25, \ 2119 "Weight given to time in adaptive policy, between 0 and 100") \ 2120 \ 2121 product(uintx, PausePadding, 1, \ 2122 "How much buffer to keep for pause time") \ 2123 \ 2124 product(uintx, PromotedPadding, 3, \ 2125 "How much buffer to keep for promotion failure") \ 2126 \ 2127 product(uintx, SurvivorPadding, 3, \ 2128 "How much buffer to keep for survivor overflow") \ 2129 \ 2130 product(uintx, AdaptivePermSizeWeight, 20, \ 2131 "Weight for perm gen exponential resizing, between 0 and 100") \ 2132 \ 2133 product(uintx, PermGenPadding, 3, \ 2134 "How much buffer to keep for perm gen sizing") \ 2135 \ 2136 product(uintx, ThresholdTolerance, 10, \ 2137 "Allowed collection cost difference between generations") \ 2138 \ 2139 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2140 "If collection costs are within margin, reduce both by full " \ 2141 "delta") \ 2142 \ 2143 product(uintx, YoungGenerationSizeIncrement, 20, \ 2144 "Adaptive size percentage change in young generation") \ 2145 \ 2146 product(uintx, YoungGenerationSizeSupplement, 80, \ 2147 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2148 \ 2149 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2150 "Decay factor to YoungedGenerationSizeSupplement") \ 2151 \ 2152 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2153 "Adaptive size percentage change in tenured generation") \ 2154 \ 2155 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2156 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2157 \ 2158 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2159 "Decay factor to TenuredGenerationSizeIncrement") \ 2160 \ 2161 product(uintx, MaxGCPauseMillis, max_uintx, \ 2162 "Adaptive size policy maximum GC pause time goal in msec, " \ 2163 "or (G1 Only) the max. GC time per MMU time slice") \ 2164 \ 2165 product(uintx, GCPauseIntervalMillis, 0, \ 2166 "Time slice for MMU specification") \ 2167 \ 2168 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2169 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2170 \ 2171 product(uintx, GCTimeRatio, 99, \ 2172 "Adaptive size policy application time to GC time ratio") \ 2173 \ 2174 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2175 "Adaptive size scale down factor for shrinking") \ 2176 \ 2177 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2178 "Adaptive size decays the major cost for long major intervals") \ 2179 \ 2180 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2181 "Time scale over which major costs decay") \ 2182 \ 2183 product(uintx, MinSurvivorRatio, 3, \ 2184 "Minimum ratio of young generation/survivor space size") \ 2185 \ 2186 product(uintx, InitialSurvivorRatio, 8, \ 2187 "Initial ratio of eden/survivor space size") \ 2188 \ 2189 product(uintx, BaseFootPrintEstimate, 256*M, \ 2190 "Estimate of footprint other than Java Heap") \ 2191 \ 2192 product(bool, UseGCOverheadLimit, true, \ 2193 "Use policy to limit of proportion of time spent in GC " \ 2194 "before an OutOfMemory error is thrown") \ 2195 \ 2196 product(uintx, GCTimeLimit, 98, \ 2197 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2198 "error is thrown (used with GCHeapFreeLimit)") \ 2199 \ 2200 product(uintx, GCHeapFreeLimit, 2, \ 2201 "Minimum percentage of free space after a full GC before an " \ 2202 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2203 \ 2204 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2205 "Number of consecutive collections before gc time limit fires") \ 2206 \ 2207 product(bool, PrintAdaptiveSizePolicy, false, \ 2208 "Print information about AdaptiveSizePolicy") \ 2209 \ 2210 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2211 "How far ahead to prefetch destination area (<= 0 means off)") \ 2212 \ 2213 product(intx, PrefetchScanIntervalInBytes, -1, \ 2214 "How far ahead to prefetch scan area (<= 0 means off)") \ 2215 \ 2216 product(intx, PrefetchFieldsAhead, -1, \ 2217 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2218 \ 2219 develop(bool, UsePrefetchQueue, true, \ 2220 "Use the prefetch queue during PS promotion") \ 2221 \ 2222 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2223 "Verify system before exiting") \ 2224 \ 2225 diagnostic(bool, VerifyBeforeGC, false, \ 2226 "Verify memory system before GC") \ 2227 \ 2228 diagnostic(bool, VerifyAfterGC, false, \ 2229 "Verify memory system after GC") \ 2230 \ 2231 diagnostic(bool, VerifyDuringGC, false, \ 2232 "Verify memory system during GC (between phases)") \ 2233 \ 2234 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2235 "Enable parallel memory system verification") \ 2236 \ 2237 diagnostic(bool, DeferInitialCardMark, false, \ 2238 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2239 "may arise from new_pre_store_barrier") \ 2240 \ 2241 diagnostic(bool, VerifyRememberedSets, false, \ 2242 "Verify GC remembered sets") \ 2243 \ 2244 diagnostic(bool, VerifyObjectStartArray, true, \ 2245 "Verify GC object start array if verify before/after") \ 2246 \ 2247 product(bool, DisableExplicitGC, false, \ 2248 "Tells whether calling System.gc() does a full GC") \ 2249 \ 2250 notproduct(bool, CheckMemoryInitialization, false, \ 2251 "Checks memory initialization") \ 2252 \ 2253 product(bool, CollectGen0First, false, \ 2254 "Collect youngest generation before each full GC") \ 2255 \ 2256 diagnostic(bool, BindCMSThreadToCPU, false, \ 2257 "Bind CMS Thread to CPU if possible") \ 2258 \ 2259 diagnostic(uintx, CPUForCMSThread, 0, \ 2260 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2261 \ 2262 product(bool, BindGCTaskThreadsToCPUs, false, \ 2263 "Bind GCTaskThreads to CPUs if possible") \ 2264 \ 2265 product(bool, UseGCTaskAffinity, false, \ 2266 "Use worker affinity when asking for GCTasks") \ 2267 \ 2268 product(uintx, ProcessDistributionStride, 4, \ 2269 "Stride through processors when distributing processes") \ 2270 \ 2271 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2272 "number of times the coordinator GC thread will sleep while " \ 2273 "yielding before giving up and resuming GC") \ 2274 \ 2275 product(uintx, CMSYieldSleepCount, 0, \ 2276 "number of times a GC thread (minus the coordinator) " \ 2277 "will sleep while yielding before giving up and resuming GC") \ 2278 \ 2279 /* gc tracing */ \ 2280 manageable(bool, PrintGC, false, \ 2281 "Print message at garbage collect") \ 2282 \ 2283 manageable(bool, PrintGCDetails, false, \ 2284 "Print more details at garbage collect") \ 2285 \ 2286 manageable(bool, PrintGCDateStamps, false, \ 2287 "Print date stamps at garbage collect") \ 2288 \ 2289 manageable(bool, PrintGCTimeStamps, false, \ 2290 "Print timestamps at garbage collect") \ 2291 \ 2292 product(bool, PrintGCTaskTimeStamps, false, \ 2293 "Print timestamps for individual gc worker thread tasks") \ 2294 \ 2295 develop(intx, ConcGCYieldTimeout, 0, \ 2296 "If non-zero, assert that GC threads yield within this # of ms.") \ 2297 \ 2298 notproduct(bool, TraceMarkSweep, false, \ 2299 "Trace mark sweep") \ 2300 \ 2301 product(bool, PrintReferenceGC, false, \ 2302 "Print times spent handling reference objects during GC " \ 2303 " (enabled only when PrintGCDetails)") \ 2304 \ 2305 develop(bool, TraceReferenceGC, false, \ 2306 "Trace handling of soft/weak/final/phantom references") \ 2307 \ 2308 develop(bool, TraceFinalizerRegistration, false, \ 2309 "Trace registration of final references") \ 2310 \ 2311 notproduct(bool, TraceScavenge, false, \ 2312 "Trace scavenge") \ 2313 \ 2314 product_rw(bool, TraceClassLoading, false, \ 2315 "Trace all classes loaded") \ 2316 \ 2317 product(bool, TraceClassLoadingPreorder, false, \ 2318 "Trace all classes loaded in order referenced (not loaded)") \ 2319 \ 2320 product_rw(bool, TraceClassUnloading, false, \ 2321 "Trace unloading of classes") \ 2322 \ 2323 product_rw(bool, TraceLoaderConstraints, false, \ 2324 "Trace loader constraints") \ 2325 \ 2326 product(bool, TraceGen0Time, false, \ 2327 "Trace accumulated time for Gen 0 collection") \ 2328 \ 2329 product(bool, TraceGen1Time, false, \ 2330 "Trace accumulated time for Gen 1 collection") \ 2331 \ 2332 product(bool, PrintTenuringDistribution, false, \ 2333 "Print tenuring age information") \ 2334 \ 2335 product_rw(bool, PrintHeapAtGC, false, \ 2336 "Print heap layout before and after each GC") \ 2337 \ 2338 product_rw(bool, PrintHeapAtGCExtended, false, \ 2339 "Prints extended information about the layout of the heap " \ 2340 "when -XX:+PrintHeapAtGC is set") \ 2341 \ 2342 product(bool, PrintHeapAtSIGBREAK, true, \ 2343 "Print heap layout in response to SIGBREAK") \ 2344 \ 2345 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2346 "Print a class histogram before any major stop-world GC") \ 2347 \ 2348 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2349 "Print a class histogram after any major stop-world GC") \ 2350 \ 2351 manageable(bool, PrintClassHistogram, false, \ 2352 "Print a histogram of class instances") \ 2353 \ 2354 develop(bool, TraceWorkGang, false, \ 2355 "Trace activities of work gangs") \ 2356 \ 2357 product(bool, TraceParallelOldGCTasks, false, \ 2358 "Trace multithreaded GC activity") \ 2359 \ 2360 develop(bool, TraceBlockOffsetTable, false, \ 2361 "Print BlockOffsetTable maps") \ 2362 \ 2363 develop(bool, TraceCardTableModRefBS, false, \ 2364 "Print CardTableModRefBS maps") \ 2365 \ 2366 develop(bool, TraceGCTaskManager, false, \ 2367 "Trace actions of the GC task manager") \ 2368 \ 2369 develop(bool, TraceGCTaskQueue, false, \ 2370 "Trace actions of the GC task queues") \ 2371 \ 2372 develop(bool, TraceGCTaskThread, false, \ 2373 "Trace actions of the GC task threads") \ 2374 \ 2375 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2376 "Print the time taken by each parallel old gc phase." \ 2377 "PrintGCDetails must also be enabled.") \ 2378 \ 2379 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2380 "Trace parallel old gc marking phase") \ 2381 \ 2382 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2383 "Trace parallel old gc summary phase") \ 2384 \ 2385 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2386 "Trace parallel old gc compaction phase") \ 2387 \ 2388 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2389 "Trace parallel old gc dense prefix computation") \ 2390 \ 2391 develop(bool, IgnoreLibthreadGPFault, false, \ 2392 "Suppress workaround for libthread GP fault") \ 2393 \ 2394 product(bool, PrintJNIGCStalls, false, \ 2395 "Print diagnostic message when GC is stalled" \ 2396 "by JNI critical section") \ 2397 \ 2398 /* GC log rotation setting */ \ 2399 \ 2400 product(bool, UseGCLogFileRotation, false, \ 2401 "Prevent large gclog file for long running app. " \ 2402 "Requires -Xloggc:<filename>") \ 2403 \ 2404 product(uintx, NumberOfGCLogFiles, 0, \ 2405 "Number of gclog files in rotation, " \ 2406 "Default: 0, no rotation") \ 2407 \ 2408 product(uintx, GCLogFileSize, 0, \ 2409 "GC log file size, Default: 0 bytes, no rotation " \ 2410 "Only valid with UseGCLogFileRotation") \ 2411 \ 2412 /* JVMTI heap profiling */ \ 2413 \ 2414 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2415 "Trace JVMTI object tagging calls") \ 2416 \ 2417 diagnostic(bool, VerifyBeforeIteration, false, \ 2418 "Verify memory system before JVMTI iteration") \ 2419 \ 2420 /* compiler interface */ \ 2421 \ 2422 develop(bool, CIPrintCompilerName, false, \ 2423 "when CIPrint is active, print the name of the active compiler") \ 2424 \ 2425 develop(bool, CIPrintCompileQueue, false, \ 2426 "display the contents of the compile queue whenever a " \ 2427 "compilation is enqueued") \ 2428 \ 2429 develop(bool, CIPrintRequests, false, \ 2430 "display every request for compilation") \ 2431 \ 2432 product(bool, CITime, false, \ 2433 "collect timing information for compilation") \ 2434 \ 2435 develop(bool, CITimeEach, false, \ 2436 "display timing information after each successful compilation") \ 2437 \ 2438 develop(bool, CICountOSR, true, \ 2439 "use a separate counter when assigning ids to osr compilations") \ 2440 \ 2441 develop(bool, CICompileNatives, true, \ 2442 "compile native methods if supported by the compiler") \ 2443 \ 2444 develop_pd(bool, CICompileOSR, \ 2445 "compile on stack replacement methods if supported by the " \ 2446 "compiler") \ 2447 \ 2448 develop(bool, CIPrintMethodCodes, false, \ 2449 "print method bytecodes of the compiled code") \ 2450 \ 2451 develop(bool, CIPrintTypeFlow, false, \ 2452 "print the results of ciTypeFlow analysis") \ 2453 \ 2454 develop(bool, CITraceTypeFlow, false, \ 2455 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2456 \ 2457 develop(intx, CICloneLoopTestLimit, 100, \ 2458 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2459 \ 2460 develop(intx, OSROnlyBCI, -1, \ 2461 "OSR only at this bci. Negative values mean exclude that bci") \ 2462 \ 2463 /* temp diagnostics */ \ 2464 \ 2465 diagnostic(bool, TraceRedundantCompiles, false, \ 2466 "Have compile broker print when a request already in the queue is"\ 2467 " requested again") \ 2468 \ 2469 diagnostic(bool, InitialCompileFast, false, \ 2470 "Initial compile at CompLevel_fast_compile") \ 2471 \ 2472 diagnostic(bool, InitialCompileReallyFast, false, \ 2473 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2474 \ 2475 diagnostic(bool, FullProfileOnReInterpret, true, \ 2476 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2477 \ 2478 /* compiler */ \ 2479 \ 2480 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2481 "Number of compiler threads to run") \ 2482 \ 2483 product(intx, CompilationPolicyChoice, 0, \ 2484 "which compilation policy (0/1)") \ 2485 \ 2486 develop(bool, UseStackBanging, true, \ 2487 "use stack banging for stack overflow checks (required for " \ 2488 "proper StackOverflow handling; disable only to measure cost " \ 2489 "of stackbanging)") \ 2490 \ 2491 develop(bool, Use24BitFPMode, true, \ 2492 "Set 24-bit FPU mode on a per-compile basis ") \ 2493 \ 2494 develop(bool, Use24BitFP, true, \ 2495 "use FP instructions that produce 24-bit precise results") \ 2496 \ 2497 develop(bool, UseStrictFP, true, \ 2498 "use strict fp if modifier strictfp is set") \ 2499 \ 2500 develop(bool, GenerateSynchronizationCode, true, \ 2501 "generate locking/unlocking code for synchronized methods and " \ 2502 "monitors") \ 2503 \ 2504 develop(bool, GenerateCompilerNullChecks, true, \ 2505 "Generate explicit null checks for loads/stores/calls") \ 2506 \ 2507 develop(bool, GenerateRangeChecks, true, \ 2508 "Generate range checks for array accesses") \ 2509 \ 2510 develop_pd(bool, ImplicitNullChecks, \ 2511 "generate code for implicit null checks") \ 2512 \ 2513 product(bool, PrintSafepointStatistics, false, \ 2514 "print statistics about safepoint synchronization") \ 2515 \ 2516 product(intx, PrintSafepointStatisticsCount, 300, \ 2517 "total number of safepoint statistics collected " \ 2518 "before printing them out") \ 2519 \ 2520 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2521 "print safepoint statistics only when safepoint takes" \ 2522 " more than PrintSafepointSatisticsTimeout in millis") \ 2523 \ 2524 product(bool, TraceSafepointCleanupTime, false, \ 2525 "print the break down of clean up tasks performed during" \ 2526 " safepoint") \ 2527 \ 2528 develop(bool, InlineAccessors, true, \ 2529 "inline accessor methods (get/set)") \ 2530 \ 2531 product(bool, Inline, true, \ 2532 "enable inlining") \ 2533 \ 2534 product(bool, ClipInlining, true, \ 2535 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2536 \ 2537 develop(bool, UseCHA, true, \ 2538 "enable CHA") \ 2539 \ 2540 product(bool, UseTypeProfile, true, \ 2541 "Check interpreter profile for historically monomorphic calls") \ 2542 \ 2543 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2544 "% of major receiver type to all profiled receivers") \ 2545 \ 2546 notproduct(bool, TimeCompiler, false, \ 2547 "time the compiler") \ 2548 \ 2549 notproduct(bool, TimeCompiler2, false, \ 2550 "detailed time the compiler (requires +TimeCompiler)") \ 2551 \ 2552 diagnostic(bool, PrintInlining, false, \ 2553 "prints inlining optimizations") \ 2554 \ 2555 diagnostic(bool, PrintIntrinsics, false, \ 2556 "prints attempted and successful inlining of intrinsics") \ 2557 \ 2558 product(bool, UseCountLeadingZerosInstruction, false, \ 2559 "Use count leading zeros instruction") \ 2560 \ 2561 product(bool, UsePopCountInstruction, false, \ 2562 "Use population count instruction") \ 2563 \ 2564 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2565 "do not expand intrinsics whose (internal) names appear here") \ 2566 \ 2567 develop(bool, StressReflectiveCode, false, \ 2568 "Use inexact types at allocations, etc., to test reflection") \ 2569 \ 2570 develop(bool, EagerInitialization, false, \ 2571 "Eagerly initialize classes if possible") \ 2572 \ 2573 develop(bool, TraceMethodReplacement, false, \ 2574 "Print when methods are replaced do to recompilation") \ 2575 \ 2576 develop(bool, PrintMethodFlushing, false, \ 2577 "print the nmethods being flushed") \ 2578 \ 2579 notproduct(bool, LogMultipleMutexLocking, false, \ 2580 "log locking and unlocking of mutexes (only if multiple locks " \ 2581 "are held)") \ 2582 \ 2583 develop(bool, UseRelocIndex, false, \ 2584 "use an index to speed random access to relocations") \ 2585 \ 2586 develop(bool, StressCodeBuffers, false, \ 2587 "Exercise code buffer expansion and other rare state changes") \ 2588 \ 2589 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2590 "Generate extra debugging info for non-safepoints in nmethods") \ 2591 \ 2592 diagnostic(bool, DebugInlinedCalls, true, \ 2593 "If false, restricts profiled locations to the root method only") \ 2594 \ 2595 product(bool, PrintVMOptions, false, \ 2596 "Print flags that appeared on the command line") \ 2597 \ 2598 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2599 "Ignore unrecognized VM options") \ 2600 \ 2601 product(bool, PrintCommandLineFlags, false, \ 2602 "Print flags specified on command line or set by ergonomics") \ 2603 \ 2604 product(bool, PrintFlagsInitial, false, \ 2605 "Print all VM flags before argument processing and exit VM") \ 2606 \ 2607 product(bool, PrintFlagsFinal, false, \ 2608 "Print all VM flags after argument and ergonomic processing") \ 2609 \ 2610 notproduct(bool, PrintFlagsWithComments, false, \ 2611 "Print all VM flags with default values and descriptions and exit")\ 2612 \ 2613 diagnostic(bool, SerializeVMOutput, true, \ 2614 "Use a mutex to serialize output to tty and hotspot.log") \ 2615 \ 2616 diagnostic(bool, DisplayVMOutput, true, \ 2617 "Display all VM output on the tty, independently of LogVMOutput") \ 2618 \ 2619 diagnostic(bool, LogVMOutput, trueInDebug, \ 2620 "Save VM output to hotspot.log, or to LogFile") \ 2621 \ 2622 diagnostic(ccstr, LogFile, NULL, \ 2623 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2624 \ 2625 product(ccstr, ErrorFile, NULL, \ 2626 "If an error occurs, save the error data to this file " \ 2627 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2628 \ 2629 product(bool, DisplayVMOutputToStderr, false, \ 2630 "If DisplayVMOutput is true, display all VM output to stderr") \ 2631 \ 2632 product(bool, DisplayVMOutputToStdout, false, \ 2633 "If DisplayVMOutput is true, display all VM output to stdout") \ 2634 \ 2635 product(bool, UseHeavyMonitors, false, \ 2636 "use heavyweight instead of lightweight Java monitors") \ 2637 \ 2638 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2639 "print histogram of the symbol table") \ 2640 \ 2641 notproduct(bool, ExitVMOnVerifyError, false, \ 2642 "standard exit from VM if bytecode verify error " \ 2643 "(only in debug mode)") \ 2644 \ 2645 notproduct(ccstr, AbortVMOnException, NULL, \ 2646 "Call fatal if this exception is thrown. Example: " \ 2647 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2648 \ 2649 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2650 "Call fatal if the exception pointed by AbortVMOnException " \ 2651 "has this message.") \ 2652 \ 2653 develop(bool, DebugVtables, false, \ 2654 "add debugging code to vtable dispatch") \ 2655 \ 2656 develop(bool, PrintVtables, false, \ 2657 "print vtables when printing klass") \ 2658 \ 2659 notproduct(bool, PrintVtableStats, false, \ 2660 "print vtables stats at end of run") \ 2661 \ 2662 develop(bool, TraceCreateZombies, false, \ 2663 "trace creation of zombie nmethods") \ 2664 \ 2665 notproduct(bool, IgnoreLockingAssertions, false, \ 2666 "disable locking assertions (for speed)") \ 2667 \ 2668 notproduct(bool, VerifyLoopOptimizations, false, \ 2669 "verify major loop optimizations") \ 2670 \ 2671 product(bool, RangeCheckElimination, true, \ 2672 "Split loop iterations to eliminate range checks") \ 2673 \ 2674 develop_pd(bool, UncommonNullCast, \ 2675 "track occurrences of null in casts; adjust compiler tactics") \ 2676 \ 2677 develop(bool, TypeProfileCasts, true, \ 2678 "treat casts like calls for purposes of type profiling") \ 2679 \ 2680 develop(bool, MonomorphicArrayCheck, true, \ 2681 "Uncommon-trap array store checks that require full type check") \ 2682 \ 2683 diagnostic(bool, ProfileDynamicTypes, true, \ 2684 "do extra type profiling and use it more aggressively") \ 2685 \ 2686 develop(bool, DelayCompilationDuringStartup, true, \ 2687 "Delay invoking the compiler until main application class is " \ 2688 "loaded") \ 2689 \ 2690 develop(bool, CompileTheWorld, false, \ 2691 "Compile all methods in all classes in bootstrap class path " \ 2692 "(stress test)") \ 2693 \ 2694 develop(bool, CompileTheWorldPreloadClasses, true, \ 2695 "Preload all classes used by a class before start loading") \ 2696 \ 2697 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2698 "Force a safepoint every n compiles so sweeper can keep up") \ 2699 \ 2700 develop(bool, TraceIterativeGVN, false, \ 2701 "Print progress during Iterative Global Value Numbering") \ 2702 \ 2703 develop(bool, FillDelaySlots, true, \ 2704 "Fill delay slots (on SPARC only)") \ 2705 \ 2706 develop(bool, VerifyIterativeGVN, false, \ 2707 "Verify Def-Use modifications during sparse Iterative Global " \ 2708 "Value Numbering") \ 2709 \ 2710 notproduct(bool, TracePhaseCCP, false, \ 2711 "Print progress during Conditional Constant Propagation") \ 2712 \ 2713 develop(bool, TimeLivenessAnalysis, false, \ 2714 "Time computation of bytecode liveness analysis") \ 2715 \ 2716 develop(bool, TraceLivenessGen, false, \ 2717 "Trace the generation of liveness analysis information") \ 2718 \ 2719 notproduct(bool, TraceLivenessQuery, false, \ 2720 "Trace queries of liveness analysis information") \ 2721 \ 2722 notproduct(bool, CollectIndexSetStatistics, false, \ 2723 "Collect information about IndexSets") \ 2724 \ 2725 develop(bool, PrintDominators, false, \ 2726 "Print out dominator trees for GVN") \ 2727 \ 2728 develop(bool, UseLoopSafepoints, true, \ 2729 "Generate Safepoint nodes in every loop") \ 2730 \ 2731 notproduct(bool, TraceCISCSpill, false, \ 2732 "Trace allocators use of cisc spillable instructions") \ 2733 \ 2734 notproduct(bool, TraceSpilling, false, \ 2735 "Trace spilling") \ 2736 \ 2737 product(bool, SplitIfBlocks, true, \ 2738 "Clone compares and control flow through merge points to fold " \ 2739 "some branches") \ 2740 \ 2741 develop(intx, FastAllocateSizeLimit, 128*K, \ 2742 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2743 "Inline allocations larger than this in doublewords must go slow")\ 2744 \ 2745 product(bool, AggressiveOpts, false, \ 2746 "Enable aggressive optimizations - see arguments.cpp") \ 2747 \ 2748 product(bool, UseStringCache, false, \ 2749 "Enable String cache capabilities on String.java") \ 2750 \ 2751 /* statistics */ \ 2752 develop(bool, CountCompiledCalls, false, \ 2753 "counts method invocations") \ 2754 \ 2755 notproduct(bool, CountRuntimeCalls, false, \ 2756 "counts VM runtime calls") \ 2757 \ 2758 develop(bool, CountJNICalls, false, \ 2759 "counts jni method invocations") \ 2760 \ 2761 notproduct(bool, CountJVMCalls, false, \ 2762 "counts jvm method invocations") \ 2763 \ 2764 notproduct(bool, CountRemovableExceptions, false, \ 2765 "count exceptions that could be replaced by branches due to " \ 2766 "inlining") \ 2767 \ 2768 notproduct(bool, ICMissHistogram, false, \ 2769 "produce histogram of IC misses") \ 2770 \ 2771 notproduct(bool, PrintClassStatistics, false, \ 2772 "prints class statistics at end of run") \ 2773 \ 2774 notproduct(bool, PrintMethodStatistics, false, \ 2775 "prints method statistics at end of run") \ 2776 \ 2777 /* interpreter */ \ 2778 develop(bool, ClearInterpreterLocals, false, \ 2779 "Always clear local variables of interpreter activations upon " \ 2780 "entry") \ 2781 \ 2782 product_pd(bool, RewriteBytecodes, \ 2783 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2784 \ 2785 product_pd(bool, RewriteFrequentPairs, \ 2786 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2787 \ 2788 diagnostic(bool, PrintInterpreter, false, \ 2789 "Prints the generated interpreter code") \ 2790 \ 2791 product(bool, UseInterpreter, true, \ 2792 "Use interpreter for non-compiled methods") \ 2793 \ 2794 develop(bool, UseFastSignatureHandlers, true, \ 2795 "Use fast signature handlers for native calls") \ 2796 \ 2797 develop(bool, UseV8InstrsOnly, false, \ 2798 "Use SPARC-V8 Compliant instruction subset") \ 2799 \ 2800 product(bool, UseNiagaraInstrs, false, \ 2801 "Use Niagara-efficient instruction subset") \ 2802 \ 2803 develop(bool, UseCASForSwap, false, \ 2804 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2805 \ 2806 product(bool, UseLoopCounter, true, \ 2807 "Increment invocation counter on backward branch") \ 2808 \ 2809 product(bool, UseFastEmptyMethods, true, \ 2810 "Use fast method entry code for empty methods") \ 2811 \ 2812 product(bool, UseFastAccessorMethods, true, \ 2813 "Use fast method entry code for accessor methods") \ 2814 \ 2815 product_pd(bool, UseOnStackReplacement, \ 2816 "Use on stack replacement, calls runtime if invoc. counter " \ 2817 "overflows in loop") \ 2818 \ 2819 notproduct(bool, TraceOnStackReplacement, false, \ 2820 "Trace on stack replacement") \ 2821 \ 2822 develop(bool, PoisonOSREntry, true, \ 2823 "Detect abnormal calls to OSR code") \ 2824 \ 2825 product_pd(bool, PreferInterpreterNativeStubs, \ 2826 "Use always interpreter stubs for native methods invoked via " \ 2827 "interpreter") \ 2828 \ 2829 develop(bool, CountBytecodes, false, \ 2830 "Count number of bytecodes executed") \ 2831 \ 2832 develop(bool, PrintBytecodeHistogram, false, \ 2833 "Print histogram of the executed bytecodes") \ 2834 \ 2835 develop(bool, PrintBytecodePairHistogram, false, \ 2836 "Print histogram of the executed bytecode pairs") \ 2837 \ 2838 diagnostic(bool, PrintSignatureHandlers, false, \ 2839 "Print code generated for native method signature handlers") \ 2840 \ 2841 develop(bool, VerifyOops, false, \ 2842 "Do plausibility checks for oops") \ 2843 \ 2844 develop(bool, CheckUnhandledOops, false, \ 2845 "Check for unhandled oops in VM code") \ 2846 \ 2847 develop(bool, VerifyJNIFields, trueInDebug, \ 2848 "Verify jfieldIDs for instance fields") \ 2849 \ 2850 notproduct(bool, VerifyJNIEnvThread, false, \ 2851 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2852 "from JNI") \ 2853 \ 2854 develop(bool, VerifyFPU, false, \ 2855 "Verify FPU state (check for NaN's, etc.)") \ 2856 \ 2857 develop(bool, VerifyThread, false, \ 2858 "Watch the thread register for corruption (SPARC only)") \ 2859 \ 2860 develop(bool, VerifyActivationFrameSize, false, \ 2861 "Verify that activation frame didn't become smaller than its " \ 2862 "minimal size") \ 2863 \ 2864 develop(bool, TraceFrequencyInlining, false, \ 2865 "Trace frequency based inlining") \ 2866 \ 2867 notproduct(bool, TraceTypeProfile, false, \ 2868 "Trace type profile") \ 2869 \ 2870 develop_pd(bool, InlineIntrinsics, \ 2871 "Inline intrinsics that can be statically resolved") \ 2872 \ 2873 product_pd(bool, ProfileInterpreter, \ 2874 "Profile at the bytecode level during interpretation") \ 2875 \ 2876 develop_pd(bool, ProfileTraps, \ 2877 "Profile deoptimization traps at the bytecode level") \ 2878 \ 2879 product(intx, ProfileMaturityPercentage, 20, \ 2880 "number of method invocations/branches (expressed as % of " \ 2881 "CompileThreshold) before using the method's profile") \ 2882 \ 2883 develop(bool, PrintMethodData, false, \ 2884 "Print the results of +ProfileInterpreter at end of run") \ 2885 \ 2886 develop(bool, VerifyDataPointer, trueInDebug, \ 2887 "Verify the method data pointer during interpreter profiling") \ 2888 \ 2889 develop(bool, VerifyCompiledCode, false, \ 2890 "Include miscellaneous runtime verifications in nmethod code; " \ 2891 "default off because it disturbs nmethod size heuristics") \ 2892 \ 2893 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2894 "Manually make GC thread crash then dump java stack trace; " \ 2895 "Test only") \ 2896 \ 2897 /* compilation */ \ 2898 product(bool, UseCompiler, true, \ 2899 "use compilation") \ 2900 \ 2901 develop(bool, TraceCompilationPolicy, false, \ 2902 "Trace compilation policy") \ 2903 \ 2904 develop(bool, TimeCompilationPolicy, false, \ 2905 "Time the compilation policy") \ 2906 \ 2907 product(bool, UseCounterDecay, true, \ 2908 "adjust recompilation counters") \ 2909 \ 2910 develop(intx, CounterHalfLifeTime, 30, \ 2911 "half-life time of invocation counters (in secs)") \ 2912 \ 2913 develop(intx, CounterDecayMinIntervalLength, 500, \ 2914 "Min. ms. between invocation of CounterDecay") \ 2915 \ 2916 product(bool, AlwaysCompileLoopMethods, false, \ 2917 "when using recompilation, never interpret methods " \ 2918 "containing loops") \ 2919 \ 2920 product(bool, DontCompileHugeMethods, true, \ 2921 "don't compile methods > HugeMethodLimit") \ 2922 \ 2923 /* Bytecode escape analysis estimation. */ \ 2924 product(bool, EstimateArgEscape, true, \ 2925 "Analyze bytecodes to estimate escape state of arguments") \ 2926 \ 2927 product(intx, BCEATraceLevel, 0, \ 2928 "How much tracing to do of bytecode escape analysis estimates") \ 2929 \ 2930 product(intx, MaxBCEAEstimateLevel, 5, \ 2931 "Maximum number of nested calls that are analyzed by BC EA.") \ 2932 \ 2933 product(intx, MaxBCEAEstimateSize, 150, \ 2934 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2935 \ 2936 product(intx, AllocatePrefetchStyle, 1, \ 2937 "0 = no prefetch, " \ 2938 "1 = prefetch instructions for each allocation, " \ 2939 "2 = use TLAB watermark to gate allocation prefetch, " \ 2940 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2941 \ 2942 product(intx, AllocatePrefetchDistance, -1, \ 2943 "Distance to prefetch ahead of allocation pointer") \ 2944 \ 2945 product(intx, AllocatePrefetchLines, 3, \ 2946 "Number of lines to prefetch ahead of array allocation pointer") \ 2947 \ 2948 product(intx, AllocateInstancePrefetchLines, 1, \ 2949 "Number of lines to prefetch ahead of instance allocation pointer") \ 2950 \ 2951 product(intx, AllocatePrefetchStepSize, 16, \ 2952 "Step size in bytes of sequential prefetch instructions") \ 2953 \ 2954 product(intx, AllocatePrefetchInstr, 0, \ 2955 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2956 \ 2957 product(intx, ReadPrefetchInstr, 0, \ 2958 "Prefetch instruction to prefetch ahead") \ 2959 \ 2960 product(uintx, ArraycopySrcPrefetchDistance, 0, \ 2961 "Distance to prefetch source array in arracopy") \ 2962 \ 2963 product(uintx, ArraycopyDstPrefetchDistance, 0, \ 2964 "Distance to prefetch destination array in arracopy") \ 2965 \ 2966 /* deoptimization */ \ 2967 develop(bool, TraceDeoptimization, false, \ 2968 "Trace deoptimization") \ 2969 \ 2970 develop(bool, DebugDeoptimization, false, \ 2971 "Tracing various information while debugging deoptimization") \ 2972 \ 2973 product(intx, SelfDestructTimer, 0, \ 2974 "Will cause VM to terminate after a given time (in minutes) " \ 2975 "(0 means off)") \ 2976 \ 2977 product(intx, MaxJavaStackTraceDepth, 1024, \ 2978 "Max. no. of lines in the stack trace for Java exceptions " \ 2979 "(0 means all)") \ 2980 \ 2981 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2982 "Guarantee a safepoint (at least) every so many milliseconds " \ 2983 "(0 means none)")) \ 2984 \ 2985 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2986 "Guarantee a safepoint (at least) every so many milliseconds " \ 2987 "(0 means none)")) \ 2988 \ 2989 product(intx, SafepointTimeoutDelay, 10000, \ 2990 "Delay in milliseconds for option SafepointTimeout") \ 2991 \ 2992 product(intx, NmethodSweepFraction, 4, \ 2993 "Number of invocations of sweeper to cover all nmethods") \ 2994 \ 2995 product(intx, NmethodSweepCheckInterval, 5, \ 2996 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2997 \ 2998 notproduct(bool, LogSweeper, false, \ 2999 "Keep a ring buffer of sweeper activity") \ 3000 \ 3001 notproduct(intx, SweeperLogEntries, 1024, \ 3002 "Number of records in the ring buffer of sweeper activity") \ 3003 \ 3004 notproduct(intx, MemProfilingInterval, 500, \ 3005 "Time between each invocation of the MemProfiler") \ 3006 \ 3007 develop(intx, MallocCatchPtr, -1, \ 3008 "Hit breakpoint when mallocing/freeing this pointer") \ 3009 \ 3010 notproduct(intx, AssertRepeat, 1, \ 3011 "number of times to evaluate expression in assert " \ 3012 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3013 \ 3014 notproduct(ccstrlist, SuppressErrorAt, "", \ 3015 "List of assertions (file:line) to muzzle") \ 3016 \ 3017 notproduct(uintx, HandleAllocationLimit, 1024, \ 3018 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3019 "is used") \ 3020 \ 3021 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3022 "Threshold for total handle allocation when " \ 3023 "+TraceHandleAllocation is used") \ 3024 \ 3025 develop(intx, StackPrintLimit, 100, \ 3026 "number of stack frames to print in VM-level stack dump") \ 3027 \ 3028 notproduct(intx, MaxElementPrintSize, 256, \ 3029 "maximum number of elements to print") \ 3030 \ 3031 notproduct(intx, MaxSubklassPrintSize, 4, \ 3032 "maximum number of subklasses to print when printing klass") \ 3033 \ 3034 product(intx, MaxInlineLevel, 9, \ 3035 "maximum number of nested calls that are inlined") \ 3036 \ 3037 product(intx, MaxRecursiveInlineLevel, 1, \ 3038 "maximum number of nested recursive calls that are inlined") \ 3039 \ 3040 product_pd(intx, InlineSmallCode, \ 3041 "Only inline already compiled methods if their code size is " \ 3042 "less than this") \ 3043 \ 3044 product(intx, MaxInlineSize, 35, \ 3045 "maximum bytecode size of a method to be inlined") \ 3046 \ 3047 product_pd(intx, FreqInlineSize, \ 3048 "maximum bytecode size of a frequent method to be inlined") \ 3049 \ 3050 product(intx, MaxTrivialSize, 6, \ 3051 "maximum bytecode size of a trivial method to be inlined") \ 3052 \ 3053 product(intx, MinInliningThreshold, 250, \ 3054 "min. invocation count a method needs to have to be inlined") \ 3055 \ 3056 develop(intx, AlignEntryCode, 4, \ 3057 "aligns entry code to specified value (in bytes)") \ 3058 \ 3059 develop(intx, MethodHistogramCutoff, 100, \ 3060 "cutoff value for method invoc. histogram (+CountCalls)") \ 3061 \ 3062 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3063 "# of interpreted methods to show in profile") \ 3064 \ 3065 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3066 "# of compiled methods to show in profile") \ 3067 \ 3068 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3069 "# of stub methods to show in profile") \ 3070 \ 3071 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3072 "# of runtime stub nodes to show in profile") \ 3073 \ 3074 product(intx, ProfileIntervalsTicks, 100, \ 3075 "# of ticks between printing of interval profile " \ 3076 "(+ProfileIntervals)") \ 3077 \ 3078 notproduct(intx, ScavengeALotInterval, 1, \ 3079 "Interval between which scavenge will occur with +ScavengeALot") \ 3080 \ 3081 notproduct(intx, FullGCALotInterval, 1, \ 3082 "Interval between which full gc will occur with +FullGCALot") \ 3083 \ 3084 notproduct(intx, FullGCALotStart, 0, \ 3085 "For which invocation to start FullGCAlot") \ 3086 \ 3087 notproduct(intx, FullGCALotDummies, 32*K, \ 3088 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3089 "to move") \ 3090 \ 3091 develop(intx, DontYieldALotInterval, 10, \ 3092 "Interval between which yields will be dropped (milliseconds)") \ 3093 \ 3094 develop(intx, MinSleepInterval, 1, \ 3095 "Minimum sleep() interval (milliseconds) when " \ 3096 "ConvertSleepToYield is off (used for SOLARIS)") \ 3097 \ 3098 product(intx, EventLogLength, 2000, \ 3099 "maximum nof events in event log") \ 3100 \ 3101 develop(intx, ProfilerPCTickThreshold, 15, \ 3102 "Number of ticks in a PC buckets to be a hotspot") \ 3103 \ 3104 notproduct(intx, DeoptimizeALotInterval, 5, \ 3105 "Number of exits until DeoptimizeALot kicks in") \ 3106 \ 3107 notproduct(intx, ZombieALotInterval, 5, \ 3108 "Number of exits until ZombieALot kicks in") \ 3109 \ 3110 develop(bool, StressNonEntrant, false, \ 3111 "Mark nmethods non-entrant at registration") \ 3112 \ 3113 diagnostic(intx, MallocVerifyInterval, 0, \ 3114 "if non-zero, verify C heap after every N calls to " \ 3115 "malloc/realloc/free") \ 3116 \ 3117 diagnostic(intx, MallocVerifyStart, 0, \ 3118 "if non-zero, start verifying C heap after Nth call to " \ 3119 "malloc/realloc/free") \ 3120 \ 3121 product(intx, TypeProfileWidth, 2, \ 3122 "number of receiver types to record in call/cast profile") \ 3123 \ 3124 develop(intx, BciProfileWidth, 2, \ 3125 "number of return bci's to record in ret profile") \ 3126 \ 3127 product(intx, PerMethodRecompilationCutoff, 400, \ 3128 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3129 \ 3130 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3131 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3132 \ 3133 product(intx, PerMethodTrapLimit, 100, \ 3134 "Limit on traps (of one kind) in a method (includes inlines)") \ 3135 \ 3136 product(intx, PerBytecodeTrapLimit, 4, \ 3137 "Limit on traps (of one kind) at a particular BCI") \ 3138 \ 3139 develop(intx, FreqCountInvocations, 1, \ 3140 "Scaling factor for branch frequencies (deprecated)") \ 3141 \ 3142 develop(intx, InlineFrequencyRatio, 20, \ 3143 "Ratio of call site execution to caller method invocation") \ 3144 \ 3145 develop_pd(intx, InlineFrequencyCount, \ 3146 "Count of call site execution necessary to trigger frequent " \ 3147 "inlining") \ 3148 \ 3149 develop(intx, InlineThrowCount, 50, \ 3150 "Force inlining of interpreted methods that throw this often") \ 3151 \ 3152 develop(intx, InlineThrowMaxSize, 200, \ 3153 "Force inlining of throwing methods smaller than this") \ 3154 \ 3155 product(intx, AliasLevel, 3, \ 3156 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3157 "2 for class split, 3 for unique instances") \ 3158 \ 3159 develop(bool, VerifyAliases, false, \ 3160 "perform extra checks on the results of alias analysis") \ 3161 \ 3162 develop(intx, ProfilerNodeSize, 1024, \ 3163 "Size in K to allocate for the Profile Nodes of each thread") \ 3164 \ 3165 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3166 "Number of times to spin wait on a v8 atomic operation lock") \ 3167 \ 3168 product(intx, ReadSpinIterations, 100, \ 3169 "Number of read attempts before a yield (spin inner loop)") \ 3170 \ 3171 product_pd(intx, PreInflateSpin, \ 3172 "Number of times to spin wait before inflation") \ 3173 \ 3174 product(intx, PreBlockSpin, 10, \ 3175 "Number of times to spin in an inflated lock before going to " \ 3176 "an OS lock") \ 3177 \ 3178 /* gc parameters */ \ 3179 product(uintx, InitialHeapSize, 0, \ 3180 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3181 \ 3182 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3183 "Maximum heap size (in bytes)") \ 3184 \ 3185 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3186 "Initial tenured generation size (in bytes)") \ 3187 \ 3188 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3189 "Initial new generation size (in bytes)") \ 3190 \ 3191 product(uintx, MaxNewSize, max_uintx, \ 3192 "Maximum new generation size (in bytes), max_uintx means set " \ 3193 "ergonomically") \ 3194 \ 3195 product(uintx, PretenureSizeThreshold, 0, \ 3196 "Maximum size in bytes of objects allocated in DefNew " \ 3197 "generation; zero means no maximum") \ 3198 \ 3199 product(uintx, TLABSize, 0, \ 3200 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3201 \ 3202 product(uintx, MinTLABSize, 2*K, \ 3203 "Minimum allowed TLAB size (in bytes)") \ 3204 \ 3205 product(uintx, TLABAllocationWeight, 35, \ 3206 "Allocation averaging weight") \ 3207 \ 3208 product(uintx, TLABWasteTargetPercent, 1, \ 3209 "Percentage of Eden that can be wasted") \ 3210 \ 3211 product(uintx, TLABRefillWasteFraction, 64, \ 3212 "Max TLAB waste at a refill (internal fragmentation)") \ 3213 \ 3214 product(uintx, TLABWasteIncrement, 4, \ 3215 "Increment allowed waste at slow allocation") \ 3216 \ 3217 product(intx, SurvivorRatio, 8, \ 3218 "Ratio of eden/survivor space size") \ 3219 \ 3220 product(intx, NewRatio, 2, \ 3221 "Ratio of new/old generation sizes") \ 3222 \ 3223 product_pd(uintx, NewSizeThreadIncrease, \ 3224 "Additional size added to desired new generation size per " \ 3225 "non-daemon thread (in bytes)") \ 3226 \ 3227 product_pd(uintx, PermSize, \ 3228 "Initial size of permanent generation (in bytes)") \ 3229 \ 3230 product_pd(uintx, MaxPermSize, \ 3231 "Maximum size of permanent generation (in bytes)") \ 3232 \ 3233 product(uintx, MinHeapFreeRatio, 40, \ 3234 "Min percentage of heap free after GC to avoid expansion") \ 3235 \ 3236 product(uintx, MaxHeapFreeRatio, 70, \ 3237 "Max percentage of heap free after GC to avoid shrinking") \ 3238 \ 3239 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3240 "Number of milliseconds per MB of free space in the heap") \ 3241 \ 3242 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3243 "Min change in heap space due to GC (in bytes)") \ 3244 \ 3245 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3246 "Min expansion of permanent heap (in bytes)") \ 3247 \ 3248 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3249 "Max expansion of permanent heap without full GC (in bytes)") \ 3250 \ 3251 product(intx, QueuedAllocationWarningCount, 0, \ 3252 "Number of times an allocation that queues behind a GC " \ 3253 "will retry before printing a warning") \ 3254 \ 3255 diagnostic(uintx, VerifyGCStartAt, 0, \ 3256 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3257 \ 3258 diagnostic(intx, VerifyGCLevel, 0, \ 3259 "Generation level at which to start +VerifyBefore/AfterGC") \ 3260 \ 3261 develop(uintx, ExitAfterGCNum, 0, \ 3262 "If non-zero, exit after this GC.") \ 3263 \ 3264 product(intx, MaxTenuringThreshold, 15, \ 3265 "Maximum value for tenuring threshold") \ 3266 \ 3267 product(intx, InitialTenuringThreshold, 7, \ 3268 "Initial value for tenuring threshold") \ 3269 \ 3270 product(intx, TargetSurvivorRatio, 50, \ 3271 "Desired percentage of survivor space used after scavenge") \ 3272 \ 3273 product(uintx, MarkSweepDeadRatio, 5, \ 3274 "Percentage (0-100) of the old gen allowed as dead wood." \ 3275 "Serial mark sweep treats this as both the min and max value." \ 3276 "CMS uses this value only if it falls back to mark sweep." \ 3277 "Par compact uses a variable scale based on the density of the" \ 3278 "generation and treats this as the max value when the heap is" \ 3279 "either completely full or completely empty. Par compact also" \ 3280 "has a smaller default value; see arguments.cpp.") \ 3281 \ 3282 product(uintx, PermMarkSweepDeadRatio, 20, \ 3283 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3284 "See MarkSweepDeadRatio for collector-specific comments.") \ 3285 \ 3286 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3287 "How often should we fully compact the heap (ignoring the dead " \ 3288 "space parameters)") \ 3289 \ 3290 product(intx, PrintCMSStatistics, 0, \ 3291 "Statistics for CMS") \ 3292 \ 3293 product(bool, PrintCMSInitiationStatistics, false, \ 3294 "Statistics for initiating a CMS collection") \ 3295 \ 3296 product(intx, PrintFLSStatistics, 0, \ 3297 "Statistics for CMS' FreeListSpace") \ 3298 \ 3299 product(intx, PrintFLSCensus, 0, \ 3300 "Census for CMS' FreeListSpace") \ 3301 \ 3302 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3303 "Delay in ms between expansion and allocation") \ 3304 \ 3305 product(intx, DeferThrSuspendLoopCount, 4000, \ 3306 "(Unstable) Number of times to iterate in safepoint loop " \ 3307 " before blocking VM threads ") \ 3308 \ 3309 product(intx, DeferPollingPageLoopCount, -1, \ 3310 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3311 "before changing safepoint polling page to RO ") \ 3312 \ 3313 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3314 \ 3315 product(bool, PSChunkLargeArrays, true, \ 3316 "true: process large arrays in chunks") \ 3317 \ 3318 product(uintx, GCDrainStackTargetSize, 64, \ 3319 "how many entries we'll try to leave on the stack during " \ 3320 "parallel GC") \ 3321 \ 3322 /* stack parameters */ \ 3323 product_pd(intx, StackYellowPages, \ 3324 "Number of yellow zone (recoverable overflows) pages") \ 3325 \ 3326 product_pd(intx, StackRedPages, \ 3327 "Number of red zone (unrecoverable overflows) pages") \ 3328 \ 3329 product_pd(intx, StackShadowPages, \ 3330 "Number of shadow zone (for overflow checking) pages" \ 3331 " this should exceed the depth of the VM and native call stack") \ 3332 \ 3333 product_pd(intx, ThreadStackSize, \ 3334 "Thread Stack Size (in Kbytes)") \ 3335 \ 3336 product_pd(intx, VMThreadStackSize, \ 3337 "Non-Java Thread Stack Size (in Kbytes)") \ 3338 \ 3339 product_pd(intx, CompilerThreadStackSize, \ 3340 "Compiler Thread Stack Size (in Kbytes)") \ 3341 \ 3342 develop_pd(uintx, JVMInvokeMethodSlack, \ 3343 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3344 \ 3345 product(uintx, ThreadSafetyMargin, 50*M, \ 3346 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3347 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3348 "disable this feature") \ 3349 \ 3350 /* code cache parameters */ \ 3351 develop(uintx, CodeCacheSegmentSize, 64, \ 3352 "Code cache segment size (in bytes) - smallest unit of " \ 3353 "allocation") \ 3354 \ 3355 develop_pd(intx, CodeEntryAlignment, \ 3356 "Code entry alignment for generated code (in bytes)") \ 3357 \ 3358 product_pd(intx, OptoLoopAlignment, \ 3359 "Align inner loops to zero relative to this modulus") \ 3360 \ 3361 product_pd(uintx, InitialCodeCacheSize, \ 3362 "Initial code cache size (in bytes)") \ 3363 \ 3364 product_pd(uintx, ReservedCodeCacheSize, \ 3365 "Reserved code cache size (in bytes) - maximum code cache size") \ 3366 \ 3367 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3368 "When less than X space left, we stop compiling.") \ 3369 \ 3370 product_pd(uintx, CodeCacheExpansionSize, \ 3371 "Code cache expansion size (in bytes)") \ 3372 \ 3373 develop_pd(uintx, CodeCacheMinBlockLength, \ 3374 "Minimum number of segments in a code cache block.") \ 3375 \ 3376 notproduct(bool, ExitOnFullCodeCache, false, \ 3377 "Exit the VM if we fill the code cache.") \ 3378 \ 3379 product(bool, UseCodeCacheFlushing, true, \ 3380 "Attempt to clean the code cache before shutting off compiler") \ 3381 \ 3382 product(intx, MinCodeCacheFlushingInterval, 30, \ 3383 "Min number of seconds between code cache cleaning sessions") \ 3384 \ 3385 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3386 "When less than X space left, start code cache cleaning") \ 3387 \ 3388 /* interpreter debugging */ \ 3389 develop(intx, BinarySwitchThreshold, 5, \ 3390 "Minimal number of lookupswitch entries for rewriting to binary " \ 3391 "switch") \ 3392 \ 3393 develop(intx, StopInterpreterAt, 0, \ 3394 "Stops interpreter execution at specified bytecode number") \ 3395 \ 3396 develop(intx, TraceBytecodesAt, 0, \ 3397 "Traces bytecodes starting with specified bytecode number") \ 3398 \ 3399 /* compiler interface */ \ 3400 develop(intx, CIStart, 0, \ 3401 "the id of the first compilation to permit") \ 3402 \ 3403 develop(intx, CIStop, -1, \ 3404 "the id of the last compilation to permit") \ 3405 \ 3406 develop(intx, CIStartOSR, 0, \ 3407 "the id of the first osr compilation to permit " \ 3408 "(CICountOSR must be on)") \ 3409 \ 3410 develop(intx, CIStopOSR, -1, \ 3411 "the id of the last osr compilation to permit " \ 3412 "(CICountOSR must be on)") \ 3413 \ 3414 develop(intx, CIBreakAtOSR, -1, \ 3415 "id of osr compilation to break at") \ 3416 \ 3417 develop(intx, CIBreakAt, -1, \ 3418 "id of compilation to break at") \ 3419 \ 3420 product(ccstrlist, CompileOnly, "", \ 3421 "List of methods (pkg/class.name) to restrict compilation to") \ 3422 \ 3423 product(ccstr, CompileCommandFile, NULL, \ 3424 "Read compiler commands from this file [.hotspot_compiler]") \ 3425 \ 3426 product(ccstrlist, CompileCommand, "", \ 3427 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3428 \ 3429 product(bool, CICompilerCountPerCPU, false, \ 3430 "1 compiler thread for log(N CPUs)") \ 3431 \ 3432 develop(intx, CIFireOOMAt, -1, \ 3433 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3434 "(non-negative value throws OOM after this many CI accesses " \ 3435 "in each compile)") \ 3436 \ 3437 develop(intx, CIFireOOMAtDelay, -1, \ 3438 "Wait for this many CI accesses to occur in all compiles before " \ 3439 "beginning to throw OutOfMemoryErrors in each compile") \ 3440 \ 3441 notproduct(bool, CIObjectFactoryVerify, false, \ 3442 "enable potentially expensive verification in ciObjectFactory") \ 3443 \ 3444 /* Priorities */ \ 3445 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3446 \ 3447 product(intx, ThreadPriorityPolicy, 0, \ 3448 "0 : Normal. "\ 3449 " VM chooses priorities that are appropriate for normal "\ 3450 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3451 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3452 " map to lower native priority values. On Windows applications"\ 3453 " are allowed to use higher native priorities. However, with "\ 3454 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3455 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3456 " interfere with system threads. On Linux thread priorities "\ 3457 " are ignored because the OS does not support static priority "\ 3458 " in SCHED_OTHER scheduling class which is the only choice for"\ 3459 " non-root, non-realtime applications. "\ 3460 "1 : Aggressive. "\ 3461 " Java thread priorities map over to the entire range of "\ 3462 " native thread priorities. Higher Java thread priorities map "\ 3463 " to higher native thread priorities. This policy should be "\ 3464 " used with care, as sometimes it can cause performance "\ 3465 " degradation in the application and/or the entire system. On "\ 3466 " Linux this policy requires root privilege.") \ 3467 \ 3468 product(bool, ThreadPriorityVerbose, false, \ 3469 "print priority changes") \ 3470 \ 3471 product(intx, DefaultThreadPriority, -1, \ 3472 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3473 \ 3474 product(intx, CompilerThreadPriority, -1, \ 3475 "what priority should compiler threads run at (-1 means no change)") \ 3476 \ 3477 product(intx, VMThreadPriority, -1, \ 3478 "what priority should VM threads run at (-1 means no change)") \ 3479 \ 3480 product(bool, CompilerThreadHintNoPreempt, true, \ 3481 "(Solaris only) Give compiler threads an extra quanta") \ 3482 \ 3483 product(bool, VMThreadHintNoPreempt, false, \ 3484 "(Solaris only) Give VM thread an extra quanta") \ 3485 \ 3486 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3487 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3488 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3489 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3490 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3491 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3492 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3493 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3494 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3495 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3496 \ 3497 /* compiler debugging */ \ 3498 notproduct(intx, CompileTheWorldStartAt, 1, \ 3499 "First class to consider when using +CompileTheWorld") \ 3500 \ 3501 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3502 "Last class to consider when using +CompileTheWorld") \ 3503 \ 3504 develop(intx, NewCodeParameter, 0, \ 3505 "Testing Only: Create a dedicated integer parameter before " \ 3506 "putback") \ 3507 \ 3508 /* new oopmap storage allocation */ \ 3509 develop(intx, MinOopMapAllocation, 8, \ 3510 "Minimum number of OopMap entries in an OopMapSet") \ 3511 \ 3512 /* Background Compilation */ \ 3513 develop(intx, LongCompileThreshold, 50, \ 3514 "Used with +TraceLongCompiles") \ 3515 \ 3516 product(intx, StarvationMonitorInterval, 200, \ 3517 "Pause between each check in ms") \ 3518 \ 3519 /* recompilation */ \ 3520 product_pd(intx, CompileThreshold, \ 3521 "number of interpreted method invocations before (re-)compiling") \ 3522 \ 3523 product_pd(intx, BackEdgeThreshold, \ 3524 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3525 \ 3526 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3527 "Interpreter (tier 0) invocation notification frequency.") \ 3528 \ 3529 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3530 "C1 without MDO (tier 2) invocation notification frequency.") \ 3531 \ 3532 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3533 "C1 with MDO profiling (tier 3) invocation notification " \ 3534 "frequency.") \ 3535 \ 3536 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3537 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3538 \ 3539 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3540 "Interpreter (tier 0) invocation notification frequency.") \ 3541 \ 3542 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3543 "C1 without MDO (tier 2) invocation notification frequency.") \ 3544 \ 3545 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3546 "C1 with MDO profiling (tier 3) invocation notification " \ 3547 "frequency.") \ 3548 \ 3549 product(intx, Tier2CompileThreshold, 0, \ 3550 "threshold at which tier 2 compilation is invoked") \ 3551 \ 3552 product(intx, Tier2BackEdgeThreshold, 0, \ 3553 "Back edge threshold at which tier 2 compilation is invoked") \ 3554 \ 3555 product(intx, Tier3InvocationThreshold, 200, \ 3556 "Compile if number of method invocations crosses this " \ 3557 "threshold") \ 3558 \ 3559 product(intx, Tier3MinInvocationThreshold, 100, \ 3560 "Minimum invocation to compile at tier 3") \ 3561 \ 3562 product(intx, Tier3CompileThreshold, 2000, \ 3563 "Threshold at which tier 3 compilation is invoked (invocation " \ 3564 "minimum must be satisfied.") \ 3565 \ 3566 product(intx, Tier3BackEdgeThreshold, 7000, \ 3567 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3568 \ 3569 product(intx, Tier4InvocationThreshold, 5000, \ 3570 "Compile if number of method invocations crosses this " \ 3571 "threshold") \ 3572 \ 3573 product(intx, Tier4MinInvocationThreshold, 600, \ 3574 "Minimum invocation to compile at tier 4") \ 3575 \ 3576 product(intx, Tier4CompileThreshold, 15000, \ 3577 "Threshold at which tier 4 compilation is invoked (invocation " \ 3578 "minimum must be satisfied.") \ 3579 \ 3580 product(intx, Tier4BackEdgeThreshold, 40000, \ 3581 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3582 \ 3583 product(intx, Tier3DelayOn, 5, \ 3584 "If C2 queue size grows over this amount per compiler thread " \ 3585 "stop compiling at tier 3 and start compiling at tier 2") \ 3586 \ 3587 product(intx, Tier3DelayOff, 2, \ 3588 "If C2 queue size is less than this amount per compiler thread " \ 3589 "allow methods compiled at tier 2 transition to tier 3") \ 3590 \ 3591 product(intx, Tier3LoadFeedback, 5, \ 3592 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3593 "reaches this amount per compiler thread") \ 3594 \ 3595 product(intx, Tier4LoadFeedback, 3, \ 3596 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3597 "reaches this amount per compiler thread") \ 3598 \ 3599 product(intx, TieredCompileTaskTimeout, 50, \ 3600 "Kill compile task if method was not used within " \ 3601 "given timeout in milliseconds") \ 3602 \ 3603 product(intx, TieredStopAtLevel, 4, \ 3604 "Stop at given compilation level") \ 3605 \ 3606 product(intx, Tier0ProfilingStartPercentage, 200, \ 3607 "Start profiling in interpreter if the counters exceed tier 3" \ 3608 "thresholds by the specified percentage") \ 3609 \ 3610 product(intx, TieredRateUpdateMinTime, 1, \ 3611 "Minimum rate sampling interval (in milliseconds)") \ 3612 \ 3613 product(intx, TieredRateUpdateMaxTime, 25, \ 3614 "Maximum rate sampling interval (in milliseconds)") \ 3615 \ 3616 product_pd(bool, TieredCompilation, \ 3617 "Enable tiered compilation") \ 3618 \ 3619 product(bool, PrintTieredEvents, false, \ 3620 "Print tiered events notifications") \ 3621 \ 3622 product(bool, StressTieredRuntime, false, \ 3623 "Alternate client and server compiler on compile requests") \ 3624 \ 3625 product_pd(intx, OnStackReplacePercentage, \ 3626 "NON_TIERED number of method invocations/branches (expressed as %"\ 3627 "of CompileThreshold) before (re-)compiling OSR code") \ 3628 \ 3629 product(intx, InterpreterProfilePercentage, 33, \ 3630 "NON_TIERED number of method invocations/branches (expressed as %"\ 3631 "of CompileThreshold) before profiling in the interpreter") \ 3632 \ 3633 develop(intx, MaxRecompilationSearchLength, 10, \ 3634 "max. # frames to inspect searching for recompilee") \ 3635 \ 3636 develop(intx, MaxInterpretedSearchLength, 3, \ 3637 "max. # interp. frames to skip when searching for recompilee") \ 3638 \ 3639 develop(intx, DesiredMethodLimit, 8000, \ 3640 "desired max. method size (in bytecodes) after inlining") \ 3641 \ 3642 develop(intx, HugeMethodLimit, 8000, \ 3643 "don't compile methods larger than this if " \ 3644 "+DontCompileHugeMethods") \ 3645 \ 3646 /* New JDK 1.4 reflection implementation */ \ 3647 \ 3648 develop(bool, UseNewReflection, true, \ 3649 "Temporary flag for transition to reflection based on dynamic " \ 3650 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3651 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3652 "changes were needed") \ 3653 \ 3654 develop(bool, VerifyReflectionBytecodes, false, \ 3655 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3656 "in situations like that described in 4486457 or for " \ 3657 "constructors generated for serialization, so can not be enabled "\ 3658 "in product.") \ 3659 \ 3660 product(bool, ReflectionWrapResolutionErrors, true, \ 3661 "Temporary flag for transition to AbstractMethodError wrapped " \ 3662 "in InvocationTargetException. See 6531596") \ 3663 \ 3664 \ 3665 develop(intx, FastSuperclassLimit, 8, \ 3666 "Depth of hardwired instanceof accelerator array") \ 3667 \ 3668 /* Properties for Java libraries */ \ 3669 \ 3670 product(intx, MaxDirectMemorySize, -1, \ 3671 "Maximum total size of NIO direct-buffer allocations") \ 3672 \ 3673 /* temporary developer defined flags */ \ 3674 \ 3675 diagnostic(bool, UseNewCode, false, \ 3676 "Testing Only: Use the new version while testing") \ 3677 \ 3678 diagnostic(bool, UseNewCode2, false, \ 3679 "Testing Only: Use the new version while testing") \ 3680 \ 3681 diagnostic(bool, UseNewCode3, false, \ 3682 "Testing Only: Use the new version while testing") \ 3683 \ 3684 /* flags for performance data collection */ \ 3685 \ 3686 product(bool, UsePerfData, falseInEmbedded, \ 3687 "Flag to disable jvmstat instrumentation for performance testing" \ 3688 "and problem isolation purposes.") \ 3689 \ 3690 product(bool, PerfDataSaveToFile, false, \ 3691 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3692 \ 3693 product(ccstr, PerfDataSaveFile, NULL, \ 3694 "Save PerfData memory to the specified absolute pathname," \ 3695 "%p in the file name if present will be replaced by pid") \ 3696 \ 3697 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3698 "Data sampling interval in milliseconds") \ 3699 \ 3700 develop(bool, PerfTraceDataCreation, false, \ 3701 "Trace creation of Performance Data Entries") \ 3702 \ 3703 develop(bool, PerfTraceMemOps, false, \ 3704 "Trace PerfMemory create/attach/detach calls") \ 3705 \ 3706 product(bool, PerfDisableSharedMem, false, \ 3707 "Store performance data in standard memory") \ 3708 \ 3709 product(intx, PerfDataMemorySize, 32*K, \ 3710 "Size of performance data memory region. Will be rounded " \ 3711 "up to a multiple of the native os page size.") \ 3712 \ 3713 product(intx, PerfMaxStringConstLength, 1024, \ 3714 "Maximum PerfStringConstant string length before truncation") \ 3715 \ 3716 product(bool, PerfAllowAtExitRegistration, false, \ 3717 "Allow registration of atexit() methods") \ 3718 \ 3719 product(bool, PerfBypassFileSystemCheck, false, \ 3720 "Bypass Win32 file system criteria checks (Windows Only)") \ 3721 \ 3722 product(intx, UnguardOnExecutionViolation, 0, \ 3723 "Unguard page and retry on no-execute fault (Win32 only)" \ 3724 "0=off, 1=conservative, 2=aggressive") \ 3725 \ 3726 /* Serviceability Support */ \ 3727 \ 3728 product(bool, ManagementServer, false, \ 3729 "Create JMX Management Server") \ 3730 \ 3731 product(bool, DisableAttachMechanism, false, \ 3732 "Disable mechanism that allows tools to attach to this VM") \ 3733 \ 3734 product(bool, StartAttachListener, false, \ 3735 "Always start Attach Listener at VM startup") \ 3736 \ 3737 manageable(bool, PrintConcurrentLocks, false, \ 3738 "Print java.util.concurrent locks in thread dump") \ 3739 \ 3740 product(bool, TransmitErrorReport, false, \ 3741 "Enable error report transmission on erroneous termination") \ 3742 \ 3743 product(ccstr, ErrorReportServer, NULL, \ 3744 "Override built-in error report server address") \ 3745 \ 3746 /* Shared spaces */ \ 3747 \ 3748 product(bool, UseSharedSpaces, true, \ 3749 "Use shared spaces in the permanent generation") \ 3750 \ 3751 product(bool, RequireSharedSpaces, false, \ 3752 "Require shared spaces in the permanent generation") \ 3753 \ 3754 product(bool, DumpSharedSpaces, false, \ 3755 "Special mode: JVM reads a class list, loads classes, builds " \ 3756 "shared spaces, and dumps the shared spaces to a file to be " \ 3757 "used in future JVM runs.") \ 3758 \ 3759 product(bool, PrintSharedSpaces, false, \ 3760 "Print usage of shared spaces") \ 3761 \ 3762 product(uintx, SharedDummyBlockSize, 512*M, \ 3763 "Size of dummy block used to shift heap addresses (in bytes)") \ 3764 \ 3765 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3766 "Size of read-write space in permanent generation (in bytes)") \ 3767 \ 3768 product(uintx, SharedReadOnlySize, 10*M, \ 3769 "Size of read-only space in permanent generation (in bytes)") \ 3770 \ 3771 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3772 "Size of the shared data area adjacent to the heap (in bytes)") \ 3773 \ 3774 product(uintx, SharedMiscCodeSize, 4*M, \ 3775 "Size of the shared code area adjacent to the heap (in bytes)") \ 3776 \ 3777 diagnostic(bool, SharedOptimizeColdStart, true, \ 3778 "At dump time, order shared objects to achieve better " \ 3779 "cold startup time.") \ 3780 \ 3781 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3782 "Reordering policy for SharedOptimizeColdStart " \ 3783 "0=favor classload-time locality, 1=balanced, " \ 3784 "2=favor runtime locality") \ 3785 \ 3786 diagnostic(bool, SharedSkipVerify, false, \ 3787 "Skip assert() and verify() which page-in unwanted shared " \ 3788 "objects. ") \ 3789 \ 3790 diagnostic(bool, EnableInvokeDynamic, true, \ 3791 "support JSR 292 (method handles, invokedynamic, " \ 3792 "anonymous classes") \ 3793 \ 3794 product(bool, AnonymousClasses, false, \ 3795 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3796 \ 3797 experimental(bool, EnableMethodHandles, false, \ 3798 "support method handles (deprecated)") \ 3799 \ 3800 diagnostic(intx, MethodHandlePushLimit, 3, \ 3801 "number of additional stack slots a method handle may push") \ 3802 \ 3803 diagnostic(bool, PrintMethodHandleStubs, false, \ 3804 "Print generated stub code for method handles") \ 3805 \ 3806 develop(bool, TraceMethodHandles, false, \ 3807 "trace internal method handle operations") \ 3808 \ 3809 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3810 "perform extra checks when constructing method handles") \ 3811 \ 3812 diagnostic(bool, OptimizeMethodHandles, true, \ 3813 "when constructing method handles, try to improve them") \ 3814 \ 3815 develop(bool, StressMethodHandleWalk, false, \ 3816 "Process all method handles with MethodHandleWalk") \ 3817 \ 3818 diagnostic(bool, UseRicochetFrames, true, \ 3819 "use ricochet stack frames for method handle combination, " \ 3820 "if the platform supports them") \ 3821 \ 3822 experimental(bool, TrustFinalNonStaticFields, false, \ 3823 "trust final non-static declarations for constant folding") \ 3824 \ 3825 experimental(bool, AllowInvokeGeneric, false, \ 3826 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3827 "as equivalent methods") \ 3828 \ 3829 develop(bool, TraceInvokeDynamic, false, \ 3830 "trace internal invoke dynamic operations") \ 3831 \ 3832 diagnostic(bool, PauseAtStartup, false, \ 3833 "Causes the VM to pause at startup time and wait for the pause " \ 3834 "file to be removed (default: ./vm.paused.<pid>)") \ 3835 \ 3836 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3837 "The file to create and for whose removal to await when pausing " \ 3838 "at startup. (default: ./vm.paused.<pid>)") \ 3839 \ 3840 diagnostic(bool, PauseAtExit, false, \ 3841 "Pause and wait for keypress on exit if a debugger is attached") \ 3842 \ 3843 product(bool, ExtendedDTraceProbes, false, \ 3844 "Enable performance-impacting dtrace probes") \ 3845 \ 3846 product(bool, DTraceMethodProbes, false, \ 3847 "Enable dtrace probes for method-entry and method-exit") \ 3848 \ 3849 product(bool, DTraceAllocProbes, false, \ 3850 "Enable dtrace probes for object allocation") \ 3851 \ 3852 product(bool, DTraceMonitorProbes, false, \ 3853 "Enable dtrace probes for monitor events") \ 3854 \ 3855 product(bool, RelaxAccessControlCheck, false, \ 3856 "Relax the access control checks in the verifier") \ 3857 \ 3858 diagnostic(bool, PrintDTraceDOF, false, \ 3859 "Print the DTrace DOF passed to the system for JSDT probes") \ 3860 \ 3861 product(uintx, StringTableSize, 1009, \ 3862 "Number of buckets in the interned String table") \ 3863 \ 3864 product(bool, UseVMInterruptibleIO, false, \ 3865 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3866 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3867 " of this flag is true for JDK 6 and earlier") \ 3868 \ 3869 commercial(bool, FlightRecorder, false, \ 3870 "Enable Java Flight Recorder") 3871 3872 3873/* 3874 * Macros for factoring of globals 3875 */ 3876 3877// Interface macros 3878#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3879#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3880#define DECLARE_COMMERCIAL_FLAG(type, name, value, doc) extern "C" type name; 3881#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3882#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3883#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3884#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3885#ifdef PRODUCT 3886#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3887#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3888#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3889#else 3890#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3891#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3892#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3893#endif 3894// Special LP64 flags, product only needed for now. 3895#ifdef _LP64 3896#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3897#else 3898#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3899#endif // _LP64 3900 3901// Implementation macros 3902#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3903#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3904#define MATERIALIZE_COMMERCIAL_FLAG(type, name, value, doc) type name = value; 3905#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3906#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3907#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3908#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3909#ifdef PRODUCT 3910#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3911#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3912#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3913#else 3914#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3915#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3916#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3917#endif 3918#ifdef _LP64 3919#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3920#else 3921#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3922#endif // _LP64 3923 3924RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_COMMERCIAL_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG) 3925 3926RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3927 3928#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3929