globals.hpp revision 3137:cfdfbeac0a5b
1/* 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_OS_FAMILY_linux 56# include "globals_linux.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_solaris 59# include "globals_solaris.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_windows 62# include "globals_windows.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_bsd 65# include "globals_bsd.hpp" 66#endif 67#ifdef TARGET_OS_ARCH_linux_x86 68# include "globals_linux_x86.hpp" 69#endif 70#ifdef TARGET_OS_ARCH_linux_sparc 71# include "globals_linux_sparc.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_zero 74# include "globals_linux_zero.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_solaris_x86 77# include "globals_solaris_x86.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_solaris_sparc 80# include "globals_solaris_sparc.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_windows_x86 83# include "globals_windows_x86.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_linux_arm 86# include "globals_linux_arm.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_linux_ppc 89# include "globals_linux_ppc.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_bsd_x86 92# include "globals_bsd_x86.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_bsd_zero 95# include "globals_bsd_zero.hpp" 96#endif 97#ifdef COMPILER1 98#ifdef TARGET_ARCH_x86 99# include "c1_globals_x86.hpp" 100#endif 101#ifdef TARGET_ARCH_sparc 102# include "c1_globals_sparc.hpp" 103#endif 104#ifdef TARGET_ARCH_arm 105# include "c1_globals_arm.hpp" 106#endif 107#ifdef TARGET_ARCH_ppc 108# include "c1_globals_ppc.hpp" 109#endif 110#ifdef TARGET_OS_FAMILY_linux 111# include "c1_globals_linux.hpp" 112#endif 113#ifdef TARGET_OS_FAMILY_solaris 114# include "c1_globals_solaris.hpp" 115#endif 116#ifdef TARGET_OS_FAMILY_windows 117# include "c1_globals_windows.hpp" 118#endif 119#ifdef TARGET_OS_FAMILY_bsd 120# include "c1_globals_bsd.hpp" 121#endif 122#endif 123#ifdef COMPILER2 124#ifdef TARGET_ARCH_x86 125# include "c2_globals_x86.hpp" 126#endif 127#ifdef TARGET_ARCH_sparc 128# include "c2_globals_sparc.hpp" 129#endif 130#ifdef TARGET_ARCH_arm 131# include "c2_globals_arm.hpp" 132#endif 133#ifdef TARGET_OS_FAMILY_linux 134# include "c2_globals_linux.hpp" 135#endif 136#ifdef TARGET_OS_FAMILY_solaris 137# include "c2_globals_solaris.hpp" 138#endif 139#ifdef TARGET_OS_FAMILY_windows 140# include "c2_globals_windows.hpp" 141#endif 142#ifdef TARGET_OS_FAMILY_bsd 143# include "c2_globals_bsd.hpp" 144#endif 145#endif 146#ifdef SHARK 147#ifdef TARGET_ARCH_zero 148# include "shark_globals_zero.hpp" 149#endif 150#endif 151 152#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 153define_pd_global(bool, BackgroundCompilation, false); 154define_pd_global(bool, UseTLAB, false); 155define_pd_global(bool, CICompileOSR, false); 156define_pd_global(bool, UseTypeProfile, false); 157define_pd_global(bool, UseOnStackReplacement, false); 158define_pd_global(bool, InlineIntrinsics, false); 159define_pd_global(bool, PreferInterpreterNativeStubs, true); 160define_pd_global(bool, ProfileInterpreter, false); 161define_pd_global(bool, ProfileTraps, false); 162define_pd_global(bool, TieredCompilation, false); 163 164define_pd_global(intx, CompileThreshold, 0); 165define_pd_global(intx, BackEdgeThreshold, 0); 166 167define_pd_global(intx, OnStackReplacePercentage, 0); 168define_pd_global(bool, ResizeTLAB, false); 169define_pd_global(intx, FreqInlineSize, 0); 170define_pd_global(intx, InlineSmallCode, 0); 171define_pd_global(intx, NewSizeThreadIncrease, 4*K); 172define_pd_global(intx, InlineClassNatives, true); 173define_pd_global(intx, InlineUnsafeOps, true); 174define_pd_global(intx, InitialCodeCacheSize, 160*K); 175define_pd_global(intx, ReservedCodeCacheSize, 32*M); 176define_pd_global(intx, CodeCacheExpansionSize, 32*K); 177define_pd_global(intx, CodeCacheMinBlockLength, 1); 178define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 179define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 180define_pd_global(bool, NeverActAsServerClassMachine, true); 181define_pd_global(uint64_t,MaxRAM, 1ULL*G); 182#define CI_COMPILER_COUNT 0 183#else 184 185#ifdef COMPILER2 186#define CI_COMPILER_COUNT 2 187#else 188#define CI_COMPILER_COUNT 1 189#endif // COMPILER2 190 191#endif // no compilers 192 193 194// string type aliases used only in this file 195typedef const char* ccstr; 196typedef const char* ccstrlist; // represents string arguments which accumulate 197 198enum FlagValueOrigin { 199 DEFAULT = 0, 200 COMMAND_LINE = 1, 201 ENVIRON_VAR = 2, 202 CONFIG_FILE = 3, 203 MANAGEMENT = 4, 204 ERGONOMIC = 5, 205 ATTACH_ON_DEMAND = 6, 206 INTERNAL = 99 207}; 208 209struct Flag { 210 const char *type; 211 const char *name; 212 void* addr; 213 214 NOT_PRODUCT(const char *doc;) 215 216 const char *kind; 217 FlagValueOrigin origin; 218 219 // points to all Flags static array 220 static Flag *flags; 221 222 // number of flags 223 static size_t numFlags; 224 225 static Flag* find_flag(char* name, size_t length); 226 227 bool is_bool() const { return strcmp(type, "bool") == 0; } 228 bool get_bool() const { return *((bool*) addr); } 229 void set_bool(bool value) { *((bool*) addr) = value; } 230 231 bool is_intx() const { return strcmp(type, "intx") == 0; } 232 intx get_intx() const { return *((intx*) addr); } 233 void set_intx(intx value) { *((intx*) addr) = value; } 234 235 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 236 uintx get_uintx() const { return *((uintx*) addr); } 237 void set_uintx(uintx value) { *((uintx*) addr) = value; } 238 239 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 240 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 241 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 242 243 bool is_double() const { return strcmp(type, "double") == 0; } 244 double get_double() const { return *((double*) addr); } 245 void set_double(double value) { *((double*) addr) = value; } 246 247 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 248 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 249 ccstr get_ccstr() const { return *((ccstr*) addr); } 250 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 251 252 bool is_unlocker() const; 253 bool is_unlocked() const; 254 bool is_writeable() const; 255 bool is_external() const; 256 257 bool is_unlocker_ext() const; 258 bool is_unlocked_ext() const; 259 bool is_writeable_ext() const; 260 bool is_external_ext() const; 261 262 void print_on(outputStream* st, bool withComments = false ); 263 void print_as_flag(outputStream* st); 264}; 265 266// debug flags control various aspects of the VM and are global accessible 267 268// use FlagSetting to temporarily change some debug flag 269// e.g. FlagSetting fs(DebugThisAndThat, true); 270// restored to previous value upon leaving scope 271class FlagSetting { 272 bool val; 273 bool* flag; 274 public: 275 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 276 ~FlagSetting() { *flag = val; } 277}; 278 279 280class CounterSetting { 281 intx* counter; 282 public: 283 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 284 ~CounterSetting() { (*counter)--; } 285}; 286 287 288class IntFlagSetting { 289 intx val; 290 intx* flag; 291 public: 292 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 293 ~IntFlagSetting() { *flag = val; } 294}; 295 296 297class DoubleFlagSetting { 298 double val; 299 double* flag; 300 public: 301 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 302 ~DoubleFlagSetting() { *flag = val; } 303}; 304 305 306class CommandLineFlags { 307 public: 308 static bool boolAt(char* name, size_t len, bool* value); 309 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 310 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 311 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 312 313 static bool intxAt(char* name, size_t len, intx* value); 314 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 315 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 316 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 317 318 static bool uintxAt(char* name, size_t len, uintx* value); 319 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 320 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 321 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 322 323 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 324 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 325 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 326 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 327 328 static bool doubleAt(char* name, size_t len, double* value); 329 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 330 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 331 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 332 333 static bool ccstrAt(char* name, size_t len, ccstr* value); 334 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 335 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 336 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 337 338 // Returns false if name is not a command line flag. 339 static bool wasSetOnCmdline(const char* name, bool* value); 340 static void printSetFlags(outputStream* out); 341 342 static void printFlags(outputStream* out, bool withComments); 343 344 static void verify() PRODUCT_RETURN; 345}; 346 347// use this for flags that are true by default in the debug version but 348// false in the optimized version, and vice versa 349#ifdef ASSERT 350#define trueInDebug true 351#define falseInDebug false 352#else 353#define trueInDebug false 354#define falseInDebug true 355#endif 356 357// use this for flags that are true per default in the product build 358// but false in development builds, and vice versa 359#ifdef PRODUCT 360#define trueInProduct true 361#define falseInProduct false 362#else 363#define trueInProduct false 364#define falseInProduct true 365#endif 366 367#ifdef JAVASE_EMBEDDED 368#define falseInEmbedded false 369#else 370#define falseInEmbedded true 371#endif 372 373// develop flags are settable / visible only during development and are constant in the PRODUCT version 374// product flags are always settable / visible 375// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 376 377// A flag must be declared with one of the following types: 378// bool, intx, uintx, ccstr. 379// The type "ccstr" is an alias for "const char*" and is used 380// only in this file, because the macrology requires single-token type names. 381 382// Note: Diagnostic options not meant for VM tuning or for product modes. 383// They are to be used for VM quality assurance or field diagnosis 384// of VM bugs. They are hidden so that users will not be encouraged to 385// try them as if they were VM ordinary execution options. However, they 386// are available in the product version of the VM. Under instruction 387// from support engineers, VM customers can turn them on to collect 388// diagnostic information about VM problems. To use a VM diagnostic 389// option, you must first specify +UnlockDiagnosticVMOptions. 390// (This master switch also affects the behavior of -Xprintflags.) 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, 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 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 476 "Enable normal processing of flags relating to field diagnostics")\ 477 \ 478 experimental(bool, UnlockExperimentalVMOptions, false, \ 479 "Enable normal processing of flags relating to experimental features")\ 480 \ 481 product(bool, JavaMonitorsInStackTrace, true, \ 482 "Print info. about Java monitor locks when the stacks are dumped")\ 483 \ 484 product_pd(bool, UseLargePages, \ 485 "Use large page memory") \ 486 \ 487 product_pd(bool, UseLargePagesIndividualAllocation, \ 488 "Allocate large pages individually for better affinity") \ 489 \ 490 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 491 "Fail large pages individual allocation") \ 492 \ 493 develop(bool, TracePageSizes, false, \ 494 "Trace page size selection and usage.") \ 495 \ 496 product(bool, UseNUMA, false, \ 497 "Use NUMA if available") \ 498 \ 499 product(bool, UseNUMAInterleaving, false, \ 500 "Interleave memory across NUMA nodes if available") \ 501 \ 502 product(uintx, NUMAInterleaveGranularity, 2*M, \ 503 "Granularity to use for NUMA interleaving on Windows OS") \ 504 \ 505 product(bool, ForceNUMA, false, \ 506 "Force NUMA optimizations on single-node/UMA systems") \ 507 \ 508 product(intx, NUMAChunkResizeWeight, 20, \ 509 "Percentage (0-100) used to weight the current sample when " \ 510 "computing exponentially decaying average for " \ 511 "AdaptiveNUMAChunkSizing") \ 512 \ 513 product(intx, NUMASpaceResizeRate, 1*G, \ 514 "Do not reallocate more that this amount per collection") \ 515 \ 516 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 517 "Enable adaptive chunk sizing for NUMA") \ 518 \ 519 product(bool, NUMAStats, false, \ 520 "Print NUMA stats in detailed heap information") \ 521 \ 522 product(intx, NUMAPageScanRate, 256, \ 523 "Maximum number of pages to include in the page scan procedure") \ 524 \ 525 product_pd(bool, NeedsDeoptSuspend, \ 526 "True for register window machines (sparc/ia64)") \ 527 \ 528 product(intx, UseSSE, 99, \ 529 "Highest supported SSE instructions set on x86/x64") \ 530 \ 531 product(intx, UseAVX, 99, \ 532 "Highest supported AVX instructions set on x86/x64") \ 533 \ 534 product(intx, UseVIS, 99, \ 535 "Highest supported VIS instructions set on Sparc") \ 536 \ 537 product(uintx, LargePageSizeInBytes, 0, \ 538 "Large page size (0 to let VM choose the page size") \ 539 \ 540 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 541 "Use large pages if max heap is at least this big") \ 542 \ 543 product(bool, ForceTimeHighResolution, false, \ 544 "Using high time resolution(For Win32 only)") \ 545 \ 546 develop(bool, TraceItables, false, \ 547 "Trace initialization and use of itables") \ 548 \ 549 develop(bool, TracePcPatching, false, \ 550 "Trace usage of frame::patch_pc") \ 551 \ 552 develop(bool, TraceJumps, false, \ 553 "Trace assembly jumps in thread ring buffer") \ 554 \ 555 develop(bool, TraceRelocator, false, \ 556 "Trace the bytecode relocator") \ 557 \ 558 develop(bool, TraceLongCompiles, false, \ 559 "Print out every time compilation is longer than " \ 560 "a given threashold") \ 561 \ 562 develop(bool, SafepointALot, false, \ 563 "Generates a lot of safepoints. Works with " \ 564 "GuaranteedSafepointInterval") \ 565 \ 566 product_pd(bool, BackgroundCompilation, \ 567 "A thread requesting compilation is not blocked during " \ 568 "compilation") \ 569 \ 570 product(bool, PrintVMQWaitTime, false, \ 571 "Prints out the waiting time in VM operation queue") \ 572 \ 573 develop(bool, BailoutToInterpreterForThrows, false, \ 574 "Compiled methods which throws/catches exceptions will be " \ 575 "deopt and intp.") \ 576 \ 577 develop(bool, NoYieldsInMicrolock, false, \ 578 "Disable yields in microlock") \ 579 \ 580 develop(bool, TraceOopMapGeneration, false, \ 581 "Shows oopmap generation") \ 582 \ 583 product(bool, MethodFlushing, true, \ 584 "Reclamation of zombie and not-entrant methods") \ 585 \ 586 develop(bool, VerifyStack, false, \ 587 "Verify stack of each thread when it is entering a runtime call") \ 588 \ 589 diagnostic(bool, ForceUnreachable, false, \ 590 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 591 \ 592 notproduct(bool, StressDerivedPointers, false, \ 593 "Force scavenge when a derived pointers is detected on stack " \ 594 "after rtm call") \ 595 \ 596 develop(bool, TraceDerivedPointers, false, \ 597 "Trace traversal of derived pointers on stack") \ 598 \ 599 notproduct(bool, TraceCodeBlobStacks, false, \ 600 "Trace stack-walk of codeblobs") \ 601 \ 602 product(bool, PrintJNIResolving, false, \ 603 "Used to implement -v:jni") \ 604 \ 605 notproduct(bool, PrintRewrites, false, \ 606 "Print methods that are being rewritten") \ 607 \ 608 product(bool, UseInlineCaches, true, \ 609 "Use Inline Caches for virtual calls ") \ 610 \ 611 develop(bool, InlineArrayCopy, true, \ 612 "inline arraycopy native that is known to be part of " \ 613 "base library DLL") \ 614 \ 615 develop(bool, InlineObjectHash, true, \ 616 "inline Object::hashCode() native that is known to be part " \ 617 "of base library DLL") \ 618 \ 619 develop(bool, InlineObjectCopy, true, \ 620 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 621 \ 622 develop(bool, InlineNatives, true, \ 623 "inline natives that are known to be part of base library DLL") \ 624 \ 625 develop(bool, InlineMathNatives, true, \ 626 "inline SinD, CosD, etc.") \ 627 \ 628 develop(bool, InlineClassNatives, true, \ 629 "inline Class.isInstance, etc") \ 630 \ 631 develop(bool, InlineAtomicLong, true, \ 632 "inline sun.misc.AtomicLong") \ 633 \ 634 develop(bool, InlineThreadNatives, true, \ 635 "inline Thread.currentThread, etc") \ 636 \ 637 develop(bool, InlineReflectionGetCallerClass, true, \ 638 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 639 "of base library DLL") \ 640 \ 641 develop(bool, InlineUnsafeOps, true, \ 642 "inline memory ops (native methods) from sun.misc.Unsafe") \ 643 \ 644 develop(bool, ConvertCmpD2CmpF, true, \ 645 "Convert cmpD to cmpF when one input is constant in float range") \ 646 \ 647 develop(bool, ConvertFloat2IntClipping, true, \ 648 "Convert float2int clipping idiom to integer clipping") \ 649 \ 650 develop(bool, SpecialStringCompareTo, true, \ 651 "special version of string compareTo") \ 652 \ 653 develop(bool, SpecialStringIndexOf, true, \ 654 "special version of string indexOf") \ 655 \ 656 develop(bool, SpecialStringEquals, true, \ 657 "special version of string equals") \ 658 \ 659 develop(bool, SpecialArraysEquals, true, \ 660 "special version of Arrays.equals(char[],char[])") \ 661 \ 662 product(bool, CriticalJNINatives, true, \ 663 "check for critical JNI entry points") \ 664 \ 665 notproduct(bool, StressCriticalJNINatives, false, \ 666 "Exercise register saving code in critical natives") \ 667 \ 668 product(bool, UseSSE42Intrinsics, false, \ 669 "SSE4.2 versions of intrinsics") \ 670 \ 671 product(bool, UseCondCardMark, false, \ 672 "Check for already marked card before updating card table") \ 673 \ 674 develop(bool, TraceCallFixup, false, \ 675 "traces all call fixups") \ 676 \ 677 develop(bool, DeoptimizeALot, false, \ 678 "deoptimize at every exit from the runtime system") \ 679 \ 680 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 681 "a comma separated list of bcis to deoptimize at") \ 682 \ 683 product(bool, DeoptimizeRandom, false, \ 684 "deoptimize random frames on random exit from the runtime system")\ 685 \ 686 notproduct(bool, ZombieALot, false, \ 687 "creates zombies (non-entrant) at exit from the runt. system") \ 688 \ 689 product(bool, UnlinkSymbolsALot, false, \ 690 "unlink unreferenced symbols from the symbol table at safepoints")\ 691 \ 692 notproduct(bool, WalkStackALot, false, \ 693 "trace stack (no print) at every exit from the runtime system") \ 694 \ 695 product(bool, Debugging, false, \ 696 "set when executing debug methods in debug.ccp " \ 697 "(to prevent triggering assertions)") \ 698 \ 699 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 700 "Enable strict checks that safepoints cannot happen for threads " \ 701 "that used No_Safepoint_Verifier") \ 702 \ 703 notproduct(bool, VerifyLastFrame, false, \ 704 "Verify oops on last frame on entry to VM") \ 705 \ 706 develop(bool, TraceHandleAllocation, false, \ 707 "Prints out warnings when suspicious many handles are allocated") \ 708 \ 709 product(bool, UseCompilerSafepoints, true, \ 710 "Stop at safepoints in compiled code") \ 711 \ 712 product(bool, UseSplitVerifier, true, \ 713 "use split verifier with StackMapTable attributes") \ 714 \ 715 product(bool, FailOverToOldVerifier, true, \ 716 "fail over to old verifier when split verifier fails") \ 717 \ 718 develop(bool, ShowSafepointMsgs, false, \ 719 "Show msg. about safepoint synch.") \ 720 \ 721 product(bool, SafepointTimeout, false, \ 722 "Time out and warn or fail after SafepointTimeoutDelay " \ 723 "milliseconds if failed to reach safepoint") \ 724 \ 725 develop(bool, DieOnSafepointTimeout, false, \ 726 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 727 \ 728 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 729 /* typically, at most a few retries are needed */ \ 730 product(intx, SuspendRetryCount, 50, \ 731 "Maximum retry count for an external suspend request") \ 732 \ 733 product(intx, SuspendRetryDelay, 5, \ 734 "Milliseconds to delay per retry (* current_retry_count)") \ 735 \ 736 product(bool, AssertOnSuspendWaitFailure, false, \ 737 "Assert/Guarantee on external suspend wait failure") \ 738 \ 739 product(bool, TraceSuspendWaitFailures, false, \ 740 "Trace external suspend wait failures") \ 741 \ 742 product(bool, MaxFDLimit, true, \ 743 "Bump the number of file descriptors to max in solaris.") \ 744 \ 745 diagnostic(bool, LogEvents, true, \ 746 "Enable the various ring buffer event logs") \ 747 \ 748 diagnostic(intx, LogEventsBufferEntries, 10, \ 749 "Enable the various ring buffer event logs") \ 750 \ 751 product(bool, BytecodeVerificationRemote, true, \ 752 "Enables the Java bytecode verifier for remote classes") \ 753 \ 754 product(bool, BytecodeVerificationLocal, false, \ 755 "Enables the Java bytecode verifier for local classes") \ 756 \ 757 develop(bool, ForceFloatExceptions, trueInDebug, \ 758 "Force exceptions on FP stack under/overflow") \ 759 \ 760 develop(bool, SoftMatchFailure, trueInProduct, \ 761 "If the DFA fails to match a node, print a message and bail out") \ 762 \ 763 develop(bool, VerifyStackAtCalls, false, \ 764 "Verify that the stack pointer is unchanged after calls") \ 765 \ 766 develop(bool, TraceJavaAssertions, false, \ 767 "Trace java language assertions") \ 768 \ 769 notproduct(bool, CheckAssertionStatusDirectives, false, \ 770 "temporary - see javaClasses.cpp") \ 771 \ 772 notproduct(bool, PrintMallocFree, false, \ 773 "Trace calls to C heap malloc/free allocation") \ 774 \ 775 product(bool, PrintOopAddress, false, \ 776 "Always print the location of the oop") \ 777 \ 778 notproduct(bool, VerifyCodeCacheOften, false, \ 779 "Verify compiled-code cache often") \ 780 \ 781 develop(bool, ZapDeadCompiledLocals, false, \ 782 "Zap dead locals in compiler frames") \ 783 \ 784 notproduct(bool, ZapDeadLocalsOld, false, \ 785 "Zap dead locals (old version, zaps all frames when " \ 786 "entering the VM") \ 787 \ 788 notproduct(bool, CheckOopishValues, false, \ 789 "Warn if value contains oop ( requires ZapDeadLocals)") \ 790 \ 791 develop(bool, UseMallocOnly, false, \ 792 "use only malloc/free for allocation (no resource area/arena)") \ 793 \ 794 develop(bool, PrintMalloc, false, \ 795 "print all malloc/free calls") \ 796 \ 797 develop(bool, PrintMallocStatistics, false, \ 798 "print malloc/free statistics") \ 799 \ 800 develop(bool, ZapResourceArea, trueInDebug, \ 801 "Zap freed resource/arena space with 0xABABABAB") \ 802 \ 803 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 804 "Zap freed VM handle space with 0xBCBCBCBC") \ 805 \ 806 develop(bool, ZapJNIHandleArea, trueInDebug, \ 807 "Zap freed JNI handle space with 0xFEFEFEFE") \ 808 \ 809 notproduct(bool, ZapStackSegments, trueInDebug, \ 810 "Zap allocated/freed Stack segments with 0xFADFADED") \ 811 \ 812 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 813 "Zap unused heap space with 0xBAADBABE") \ 814 \ 815 develop(bool, TraceZapUnusedHeapArea, false, \ 816 "Trace zapping of unused heap space") \ 817 \ 818 develop(bool, CheckZapUnusedHeapArea, false, \ 819 "Check zapping of unused heap space") \ 820 \ 821 develop(bool, ZapFillerObjects, trueInDebug, \ 822 "Zap filler objects with 0xDEAFBABE") \ 823 \ 824 develop(bool, PrintVMMessages, true, \ 825 "Print vm messages on console") \ 826 \ 827 product(bool, PrintGCApplicationConcurrentTime, false, \ 828 "Print the time the application has been running") \ 829 \ 830 product(bool, PrintGCApplicationStoppedTime, false, \ 831 "Print the time the application has been stopped") \ 832 \ 833 notproduct(uintx, ErrorHandlerTest, 0, \ 834 "If > 0, provokes an error after VM initialization; the value" \ 835 "determines which error to provoke. See test_error_handler()" \ 836 "in debug.cpp.") \ 837 \ 838 develop(bool, Verbose, false, \ 839 "Prints additional debugging information from other modes") \ 840 \ 841 develop(bool, PrintMiscellaneous, false, \ 842 "Prints uncategorized debugging information (requires +Verbose)") \ 843 \ 844 develop(bool, WizardMode, false, \ 845 "Prints much more debugging information") \ 846 \ 847 product(bool, ShowMessageBoxOnError, false, \ 848 "Keep process alive on VM fatal error") \ 849 \ 850 product(bool, CreateMinidumpOnCrash, false, \ 851 "Create minidump on VM fatal error") \ 852 \ 853 product_pd(bool, UseOSErrorReporting, \ 854 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 855 \ 856 product(bool, SuppressFatalErrorMessage, false, \ 857 "Do NO Fatal Error report [Avoid deadlock]") \ 858 \ 859 product(ccstrlist, OnError, "", \ 860 "Run user-defined commands on fatal error; see VMError.cpp " \ 861 "for examples") \ 862 \ 863 product(ccstrlist, OnOutOfMemoryError, "", \ 864 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 865 \ 866 manageable(bool, HeapDumpBeforeFullGC, false, \ 867 "Dump heap to file before any major stop-world GC") \ 868 \ 869 manageable(bool, HeapDumpAfterFullGC, false, \ 870 "Dump heap to file after any major stop-world GC") \ 871 \ 872 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 873 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 874 \ 875 manageable(ccstr, HeapDumpPath, NULL, \ 876 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 877 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 878 "in the working directory)") \ 879 \ 880 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 881 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 882 "when the heap usage is larger than this") \ 883 \ 884 develop(uintx, HeapDumpSegmentSize, 1*G, \ 885 "Approximate segment size when generating a segmented heap dump") \ 886 \ 887 develop(bool, BreakAtWarning, false, \ 888 "Execute breakpoint upon encountering VM warning") \ 889 \ 890 product_pd(bool, UseVectoredExceptions, \ 891 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 892 \ 893 develop(bool, TraceVMOperation, false, \ 894 "Trace vm operations") \ 895 \ 896 develop(bool, UseFakeTimers, false, \ 897 "Tells whether the VM should use system time or a fake timer") \ 898 \ 899 diagnostic(bool, LogCompilation, false, \ 900 "Log compilation activity in detail to hotspot.log or LogFile") \ 901 \ 902 product(bool, PrintCompilation, false, \ 903 "Print compilations") \ 904 \ 905 diagnostic(bool, TraceNMethodInstalls, false, \ 906 "Trace nmethod intallation") \ 907 \ 908 diagnostic(intx, ScavengeRootsInCode, 2, \ 909 "0: do not allow scavengable oops in the code cache; " \ 910 "1: allow scavenging from the code cache; " \ 911 "2: emit as many constants as the compiler can see") \ 912 \ 913 diagnostic(bool, TraceOSRBreakpoint, false, \ 914 "Trace OSR Breakpoint ") \ 915 \ 916 diagnostic(bool, TraceCompileTriggered, false, \ 917 "Trace compile triggered") \ 918 \ 919 diagnostic(bool, TraceTriggers, false, \ 920 "Trace triggers") \ 921 \ 922 product(bool, AlwaysRestoreFPU, false, \ 923 "Restore the FPU control word after every JNI call (expensive)") \ 924 \ 925 diagnostic(bool, PrintCompilation2, false, \ 926 "Print additional statistics per compilation") \ 927 \ 928 diagnostic(bool, PrintAdapterHandlers, false, \ 929 "Print code generated for i2c/c2i adapters") \ 930 \ 931 develop(bool, VerifyAdapterSharing, false, \ 932 "Verify that the code for shared adapters is the equivalent") \ 933 \ 934 diagnostic(bool, PrintAssembly, false, \ 935 "Print assembly code (using external disassembler.so)") \ 936 \ 937 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 938 "Options string passed to disassembler.so") \ 939 \ 940 diagnostic(bool, PrintNMethods, false, \ 941 "Print assembly code for nmethods when generated") \ 942 \ 943 diagnostic(bool, PrintNativeNMethods, false, \ 944 "Print assembly code for native nmethods when generated") \ 945 \ 946 develop(bool, PrintDebugInfo, false, \ 947 "Print debug information for all nmethods when generated") \ 948 \ 949 develop(bool, PrintRelocations, false, \ 950 "Print relocation information for all nmethods when generated") \ 951 \ 952 develop(bool, PrintDependencies, false, \ 953 "Print dependency information for all nmethods when generated") \ 954 \ 955 develop(bool, PrintExceptionHandlers, false, \ 956 "Print exception handler tables for all nmethods when generated") \ 957 \ 958 develop(bool, InterceptOSException, false, \ 959 "Starts debugger when an implicit OS (e.g., NULL) " \ 960 "exception happens") \ 961 \ 962 notproduct(bool, PrintCodeCache, false, \ 963 "Print the compiled_code cache when exiting") \ 964 \ 965 develop(bool, PrintCodeCache2, false, \ 966 "Print detailed info on the compiled_code cache when exiting") \ 967 \ 968 diagnostic(bool, PrintStubCode, false, \ 969 "Print generated stub code") \ 970 \ 971 product(bool, StackTraceInThrowable, true, \ 972 "Collect backtrace in throwable when exception happens") \ 973 \ 974 product(bool, OmitStackTraceInFastThrow, true, \ 975 "Omit backtraces for some 'hot' exceptions in optimized code") \ 976 \ 977 product(bool, ProfilerPrintByteCodeStatistics, false, \ 978 "Prints byte code statictics when dumping profiler output") \ 979 \ 980 product(bool, ProfilerRecordPC, false, \ 981 "Collects tick for each 16 byte interval of compiled code") \ 982 \ 983 product(bool, ProfileVM, false, \ 984 "Profiles ticks that fall within VM (either in the VM Thread " \ 985 "or VM code called through stubs)") \ 986 \ 987 product(bool, ProfileIntervals, false, \ 988 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 989 \ 990 notproduct(bool, ProfilerCheckIntervals, false, \ 991 "Collect and print info on spacing of profiler ticks") \ 992 \ 993 develop(bool, PrintJVMWarnings, false, \ 994 "Prints warnings for unimplemented JVM functions") \ 995 \ 996 product(bool, PrintWarnings, true, \ 997 "Prints JVM warnings to output stream") \ 998 \ 999 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1000 "Prints warnings for stalled SpinLocks") \ 1001 \ 1002 develop(bool, InitializeJavaLangSystem, true, \ 1003 "Initialize java.lang.System - turn off for individual " \ 1004 "method debugging") \ 1005 \ 1006 develop(bool, InitializeJavaLangString, true, \ 1007 "Initialize java.lang.String - turn off for individual " \ 1008 "method debugging") \ 1009 \ 1010 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 1011 "Initialize various error and exception classes - turn off for " \ 1012 "individual method debugging") \ 1013 \ 1014 product(bool, RegisterFinalizersAtInit, true, \ 1015 "Register finalizable objects at end of Object.<init> or " \ 1016 "after allocation") \ 1017 \ 1018 develop(bool, RegisterReferences, true, \ 1019 "Tells whether the VM should register soft/weak/final/phantom " \ 1020 "references") \ 1021 \ 1022 develop(bool, IgnoreRewrites, false, \ 1023 "Supress rewrites of bytecodes in the oopmap generator. " \ 1024 "This is unsafe!") \ 1025 \ 1026 develop(bool, PrintCodeCacheExtension, false, \ 1027 "Print extension of code cache") \ 1028 \ 1029 develop(bool, UsePrivilegedStack, true, \ 1030 "Enable the security JVM functions") \ 1031 \ 1032 develop(bool, IEEEPrecision, true, \ 1033 "Enables IEEE precision (for INTEL only)") \ 1034 \ 1035 develop(bool, ProtectionDomainVerification, true, \ 1036 "Verifies protection domain before resolution in system " \ 1037 "dictionary") \ 1038 \ 1039 product(bool, ClassUnloading, true, \ 1040 "Do unloading of classes") \ 1041 \ 1042 diagnostic(bool, LinkWellKnownClasses, false, \ 1043 "Resolve a well known class as soon as its name is seen") \ 1044 \ 1045 develop(bool, DisableStartThread, false, \ 1046 "Disable starting of additional Java threads " \ 1047 "(for debugging only)") \ 1048 \ 1049 develop(bool, MemProfiling, false, \ 1050 "Write memory usage profiling to log file") \ 1051 \ 1052 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1053 "Prints the system dictionary at exit") \ 1054 \ 1055 experimental(intx, PredictedLoadedClassCount, 0, \ 1056 "Experimental: Tune loaded class cache starting size.") \ 1057 \ 1058 diagnostic(bool, UnsyncloadClass, false, \ 1059 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1060 "class loader must call VM synchronized for findClass " \ 1061 "and defineClass.") \ 1062 \ 1063 product(bool, AlwaysLockClassLoader, false, \ 1064 "Require the VM to acquire the class loader lock before calling " \ 1065 "loadClass() even for class loaders registering " \ 1066 "as parallel capable") \ 1067 \ 1068 product(bool, AllowParallelDefineClass, false, \ 1069 "Allow parallel defineClass requests for class loaders " \ 1070 "registering as parallel capable") \ 1071 \ 1072 product(bool, MustCallLoadClassInternal, false, \ 1073 "Call loadClassInternal() rather than loadClass()") \ 1074 \ 1075 product_pd(bool, DontYieldALot, \ 1076 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1077 \ 1078 product_pd(bool, ConvertSleepToYield, \ 1079 "Converts sleep(0) to thread yield " \ 1080 "(may be off for SOLARIS to improve GUI)") \ 1081 \ 1082 product(bool, ConvertYieldToSleep, false, \ 1083 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1084 "behavior (SOLARIS only)") \ 1085 \ 1086 product(bool, UseBoundThreads, true, \ 1087 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1088 \ 1089 develop(bool, UseDetachedThreads, true, \ 1090 "Use detached threads that are recycled upon termination " \ 1091 "(for SOLARIS only)") \ 1092 \ 1093 product(bool, UseLWPSynchronization, true, \ 1094 "Use LWP-based instead of libthread-based synchronization " \ 1095 "(SPARC only)") \ 1096 \ 1097 product(ccstr, SyncKnobs, NULL, \ 1098 "(Unstable) Various monitor synchronization tunables") \ 1099 \ 1100 product(intx, EmitSync, 0, \ 1101 "(Unsafe,Unstable) " \ 1102 " Controls emission of inline sync fast-path code") \ 1103 \ 1104 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1105 \ 1106 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1107 \ 1108 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1109 \ 1110 product(intx, Atomics, 0, \ 1111 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1112 \ 1113 product(intx, FenceInstruction, 0, \ 1114 "(Unsafe,Unstable) Experimental") \ 1115 \ 1116 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1117 \ 1118 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1119 \ 1120 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1121 \ 1122 product(intx, hashCode, 0, \ 1123 "(Unstable) select hashCode generation algorithm" ) \ 1124 \ 1125 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1126 "(Unstable, Linux-specific)" \ 1127 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1128 \ 1129 product(bool, FilterSpuriousWakeups, true, \ 1130 "Prevent spurious or premature wakeups from object.wait " \ 1131 "(Solaris only)") \ 1132 \ 1133 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1134 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1135 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1136 \ 1137 develop(bool, UsePthreads, false, \ 1138 "Use pthread-based instead of libthread-based synchronization " \ 1139 "(SPARC only)") \ 1140 \ 1141 product(bool, AdjustConcurrency, false, \ 1142 "call thr_setconcurrency at thread create time to avoid " \ 1143 "LWP starvation on MP systems (For Solaris Only)") \ 1144 \ 1145 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1146 "Should the system attempt to update the compiler file when " \ 1147 "an error occurs?") \ 1148 \ 1149 product(bool, ReduceSignalUsage, false, \ 1150 "Reduce the use of OS signals in Java and/or the VM") \ 1151 \ 1152 notproduct(bool, ValidateMarkSweep, false, \ 1153 "Do extra validation during MarkSweep collection") \ 1154 \ 1155 notproduct(bool, RecordMarkSweepCompaction, false, \ 1156 "Enable GC-to-GC recording and querying of compaction during " \ 1157 "MarkSweep") \ 1158 \ 1159 develop_pd(bool, ShareVtableStubs, \ 1160 "Share vtable stubs (smaller code but worse branch prediction") \ 1161 \ 1162 develop(bool, LoadLineNumberTables, true, \ 1163 "Tells whether the class file parser loads line number tables") \ 1164 \ 1165 develop(bool, LoadLocalVariableTables, true, \ 1166 "Tells whether the class file parser loads local variable tables")\ 1167 \ 1168 develop(bool, LoadLocalVariableTypeTables, true, \ 1169 "Tells whether the class file parser loads local variable type tables")\ 1170 \ 1171 product(bool, AllowUserSignalHandlers, false, \ 1172 "Do not complain if the application installs signal handlers " \ 1173 "(Solaris & Linux only)") \ 1174 \ 1175 product(bool, UseSignalChaining, true, \ 1176 "Use signal-chaining to invoke signal handlers installed " \ 1177 "by the application (Solaris & Linux only)") \ 1178 \ 1179 product(bool, UseAltSigs, false, \ 1180 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1181 "internal signals (Solaris only)") \ 1182 \ 1183 product(bool, UseSpinning, false, \ 1184 "Use spinning in monitor inflation and before entry") \ 1185 \ 1186 product(bool, PreSpinYield, false, \ 1187 "Yield before inner spinning loop") \ 1188 \ 1189 product(bool, PostSpinYield, true, \ 1190 "Yield after inner spinning loop") \ 1191 \ 1192 product(bool, AllowJNIEnvProxy, false, \ 1193 "Allow JNIEnv proxies for jdbx") \ 1194 \ 1195 product(bool, JNIDetachReleasesMonitors, true, \ 1196 "JNI DetachCurrentThread releases monitors owned by thread") \ 1197 \ 1198 product(bool, RestoreMXCSROnJNICalls, false, \ 1199 "Restore MXCSR when returning from JNI calls") \ 1200 \ 1201 product(bool, CheckJNICalls, false, \ 1202 "Verify all arguments to JNI calls") \ 1203 \ 1204 product(bool, UseFastJNIAccessors, true, \ 1205 "Use optimized versions of Get<Primitive>Field") \ 1206 \ 1207 product(bool, EagerXrunInit, false, \ 1208 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1209 " but not all -Xrun libraries may support the state of the VM at this time") \ 1210 \ 1211 product(bool, PreserveAllAnnotations, false, \ 1212 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1213 \ 1214 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1215 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1216 \ 1217 product(bool, LazyBootClassLoader, true, \ 1218 "Enable/disable lazy opening of boot class path entries") \ 1219 \ 1220 diagnostic(bool, UseIncDec, true, \ 1221 "Use INC, DEC instructions on x86") \ 1222 \ 1223 product(bool, UseNewLongLShift, false, \ 1224 "Use optimized bitwise shift left") \ 1225 \ 1226 product(bool, UseStoreImmI16, true, \ 1227 "Use store immediate 16-bits value instruction on x86") \ 1228 \ 1229 product(bool, UseAddressNop, false, \ 1230 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1231 \ 1232 product(bool, UseXmmLoadAndClearUpper, true, \ 1233 "Load low part of XMM register and clear upper part") \ 1234 \ 1235 product(bool, UseXmmRegToRegMoveAll, false, \ 1236 "Copy all XMM register bits when moving value between registers") \ 1237 \ 1238 product(bool, UseXmmI2D, false, \ 1239 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1240 \ 1241 product(bool, UseXmmI2F, false, \ 1242 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1243 \ 1244 product(bool, UseXMMForArrayCopy, false, \ 1245 "Use SSE2 MOVQ instruction for Arraycopy") \ 1246 \ 1247 product(bool, UseUnalignedLoadStores, false, \ 1248 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1249 \ 1250 product(bool, UseCBCond, false, \ 1251 "Use compare and branch instruction on SPARC") \ 1252 \ 1253 product(intx, FieldsAllocationStyle, 1, \ 1254 "0 - type based with oops first, 1 - with oops last, " \ 1255 "2 - oops in super and sub classes are together") \ 1256 \ 1257 product(bool, CompactFields, true, \ 1258 "Allocate nonstatic fields in gaps between previous fields") \ 1259 \ 1260 notproduct(bool, PrintCompactFieldsSavings, false, \ 1261 "Print how many words were saved with CompactFields") \ 1262 \ 1263 product(bool, UseBiasedLocking, true, \ 1264 "Enable biased locking in JVM") \ 1265 \ 1266 product(intx, BiasedLockingStartupDelay, 4000, \ 1267 "Number of milliseconds to wait before enabling biased locking") \ 1268 \ 1269 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1270 "Print statistics of biased locking in JVM") \ 1271 \ 1272 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1273 "Threshold of number of revocations per type to try to " \ 1274 "rebias all objects in the heap of that type") \ 1275 \ 1276 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1277 "Threshold of number of revocations per type to permanently " \ 1278 "revoke biases of all objects in the heap of that type") \ 1279 \ 1280 product(intx, BiasedLockingDecayTime, 25000, \ 1281 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1282 "type after previous bulk rebias") \ 1283 \ 1284 develop(bool, JavaObjectsInPerm, false, \ 1285 "controls whether Classes and interned Strings are allocated" \ 1286 "in perm. This purely intended to allow debugging issues" \ 1287 "in production.") \ 1288 \ 1289 /* tracing */ \ 1290 \ 1291 notproduct(bool, TraceRuntimeCalls, false, \ 1292 "Trace run-time calls") \ 1293 \ 1294 develop(bool, TraceJNICalls, false, \ 1295 "Trace JNI calls") \ 1296 \ 1297 notproduct(bool, TraceJVMCalls, false, \ 1298 "Trace JVM calls") \ 1299 \ 1300 product(ccstr, TraceJVMTI, NULL, \ 1301 "Trace flags for JVMTI functions and events") \ 1302 \ 1303 /* This option can change an EMCP method into an obsolete method. */ \ 1304 /* This can affect tests that except specific methods to be EMCP. */ \ 1305 /* This option should be used with caution. */ \ 1306 product(bool, StressLdcRewrite, false, \ 1307 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1308 \ 1309 product(intx, TraceRedefineClasses, 0, \ 1310 "Trace level for JVMTI RedefineClasses") \ 1311 \ 1312 develop(bool, StressMethodComparator, false, \ 1313 "run the MethodComparator on all loaded methods") \ 1314 \ 1315 /* change to false by default sometime after Mustang */ \ 1316 product(bool, VerifyMergedCPBytecodes, true, \ 1317 "Verify bytecodes after RedefineClasses constant pool merging") \ 1318 \ 1319 develop(bool, TraceJNIHandleAllocation, false, \ 1320 "Trace allocation/deallocation of JNI handle blocks") \ 1321 \ 1322 develop(bool, TraceThreadEvents, false, \ 1323 "Trace all thread events") \ 1324 \ 1325 develop(bool, TraceBytecodes, false, \ 1326 "Trace bytecode execution") \ 1327 \ 1328 develop(bool, TraceClassInitialization, false, \ 1329 "Trace class initialization") \ 1330 \ 1331 develop(bool, TraceExceptions, false, \ 1332 "Trace exceptions") \ 1333 \ 1334 develop(bool, TraceICs, false, \ 1335 "Trace inline cache changes") \ 1336 \ 1337 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1338 "Trace method invocation counter overflow") \ 1339 \ 1340 develop(bool, TraceInlineCacheClearing, false, \ 1341 "Trace clearing of inline caches in nmethods") \ 1342 \ 1343 develop(bool, TraceDependencies, false, \ 1344 "Trace dependencies") \ 1345 \ 1346 develop(bool, VerifyDependencies, trueInDebug, \ 1347 "Exercise and verify the compilation dependency mechanism") \ 1348 \ 1349 develop(bool, TraceNewOopMapGeneration, false, \ 1350 "Trace OopMapGeneration") \ 1351 \ 1352 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1353 "Trace OopMapGeneration: print detailed cell states") \ 1354 \ 1355 develop(bool, TimeOopMap, false, \ 1356 "Time calls to GenerateOopMap::compute_map() in sum") \ 1357 \ 1358 develop(bool, TimeOopMap2, false, \ 1359 "Time calls to GenerateOopMap::compute_map() individually") \ 1360 \ 1361 develop(bool, TraceMonitorMismatch, false, \ 1362 "Trace monitor matching failures during OopMapGeneration") \ 1363 \ 1364 develop(bool, TraceOopMapRewrites, false, \ 1365 "Trace rewritting of method oops during oop map generation") \ 1366 \ 1367 develop(bool, TraceSafepoint, false, \ 1368 "Trace safepoint operations") \ 1369 \ 1370 develop(bool, TraceICBuffer, false, \ 1371 "Trace usage of IC buffer") \ 1372 \ 1373 develop(bool, TraceCompiledIC, false, \ 1374 "Trace changes of compiled IC") \ 1375 \ 1376 notproduct(bool, TraceZapDeadLocals, false, \ 1377 "Trace zapping dead locals") \ 1378 \ 1379 develop(bool, TraceStartupTime, false, \ 1380 "Trace setup time") \ 1381 \ 1382 product(ccstr, HPILibPath, NULL, \ 1383 "Specify alternate path to HPI library") \ 1384 \ 1385 develop(bool, TraceProtectionDomainVerification, false, \ 1386 "Trace protection domain verifcation") \ 1387 \ 1388 develop(bool, TraceClearedExceptions, false, \ 1389 "Prints when an exception is forcibly cleared") \ 1390 \ 1391 product(bool, TraceClassResolution, false, \ 1392 "Trace all constant pool resolutions (for debugging)") \ 1393 \ 1394 product(bool, TraceBiasedLocking, false, \ 1395 "Trace biased locking in JVM") \ 1396 \ 1397 product(bool, TraceMonitorInflation, false, \ 1398 "Trace monitor inflation in JVM") \ 1399 \ 1400 /* assembler */ \ 1401 product(bool, Use486InstrsOnly, false, \ 1402 "Use 80486 Compliant instruction subset") \ 1403 \ 1404 /* gc */ \ 1405 \ 1406 product(bool, UseSerialGC, false, \ 1407 "Use the serial garbage collector") \ 1408 \ 1409 product(bool, UseG1GC, false, \ 1410 "Use the Garbage-First garbage collector") \ 1411 \ 1412 product(bool, UseParallelGC, false, \ 1413 "Use the Parallel Scavenge garbage collector") \ 1414 \ 1415 product(bool, UseParallelOldGC, false, \ 1416 "Use the Parallel Old garbage collector") \ 1417 \ 1418 product(uintx, HeapMaximumCompactionInterval, 20, \ 1419 "How often should we maximally compact the heap (not allowing " \ 1420 "any dead space)") \ 1421 \ 1422 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1423 "The collection count for the first maximum compaction") \ 1424 \ 1425 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1426 "In the Parallel Old garbage collector maximum compaction for " \ 1427 "a system GC") \ 1428 \ 1429 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1430 "The mean used by the par compact dead wood" \ 1431 "limiter (a number between 0-100).") \ 1432 \ 1433 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1434 "The standard deviation used by the par compact dead wood" \ 1435 "limiter (a number between 0-100).") \ 1436 \ 1437 product(uintx, ParallelGCThreads, 0, \ 1438 "Number of parallel threads parallel gc will use") \ 1439 \ 1440 product(bool, UseDynamicNumberOfGCThreads, false, \ 1441 "Dynamically choose the number of parallel threads " \ 1442 "parallel gc will use") \ 1443 \ 1444 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1445 "Force dynamic selection of the number of" \ 1446 "parallel threads parallel gc will use to aid debugging") \ 1447 \ 1448 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1449 "Size of heap (bytes) per GC thread used in calculating the " \ 1450 "number of GC threads") \ 1451 \ 1452 product(bool, TraceDynamicGCThreads, false, \ 1453 "Trace the dynamic GC thread usage") \ 1454 \ 1455 develop(bool, ParallelOldGCSplitALot, false, \ 1456 "Provoke splitting (copying data from a young gen space to" \ 1457 "multiple destination spaces)") \ 1458 \ 1459 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1460 "How often to provoke splitting a young gen space") \ 1461 \ 1462 develop(bool, TraceRegionTasksQueuing, false, \ 1463 "Trace the queuing of the region tasks") \ 1464 \ 1465 product(uintx, ConcGCThreads, 0, \ 1466 "Number of threads concurrent gc will use") \ 1467 \ 1468 product(uintx, YoungPLABSize, 4096, \ 1469 "Size of young gen promotion labs (in HeapWords)") \ 1470 \ 1471 product(uintx, OldPLABSize, 1024, \ 1472 "Size of old gen promotion labs (in HeapWords)") \ 1473 \ 1474 product(uintx, GCTaskTimeStampEntries, 200, \ 1475 "Number of time stamp entries per gc worker thread") \ 1476 \ 1477 product(bool, AlwaysTenure, false, \ 1478 "Always tenure objects in eden. (ParallelGC only)") \ 1479 \ 1480 product(bool, NeverTenure, false, \ 1481 "Never tenure objects in eden, May tenure on overflow " \ 1482 "(ParallelGC only)") \ 1483 \ 1484 product(bool, ScavengeBeforeFullGC, true, \ 1485 "Scavenge youngest generation before each full GC, " \ 1486 "used with UseParallelGC") \ 1487 \ 1488 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1489 "Allow scavenges to occur when to_space contains objects.") \ 1490 \ 1491 product(bool, UseConcMarkSweepGC, false, \ 1492 "Use Concurrent Mark-Sweep GC in the old generation") \ 1493 \ 1494 product(bool, ExplicitGCInvokesConcurrent, false, \ 1495 "A System.gc() request invokes a concurrent collection;" \ 1496 " (effective only when UseConcMarkSweepGC)") \ 1497 \ 1498 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1499 "A System.gc() request invokes a concurrent collection and " \ 1500 "also unloads classes during such a concurrent gc cycle " \ 1501 "(effective only when UseConcMarkSweepGC)") \ 1502 \ 1503 product(bool, GCLockerInvokesConcurrent, false, \ 1504 "The exit of a JNI CS necessitating a scavenge also" \ 1505 " kicks off a bkgrd concurrent collection") \ 1506 \ 1507 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1508 "How much the GC can expand the eden by while the GC locker " \ 1509 "is active (as a percentage)") \ 1510 \ 1511 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1512 "Use Adaptive Free Lists in the CMS generation") \ 1513 \ 1514 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1515 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1516 \ 1517 develop(bool, RotateCMSCollectionTypes, false, \ 1518 "Rotate the CMS collections among concurrent and STW") \ 1519 \ 1520 product(bool, UseCMSBestFit, true, \ 1521 "Use CMS best fit allocation strategy") \ 1522 \ 1523 product(bool, UseCMSCollectionPassing, true, \ 1524 "Use passing of collection from background to foreground") \ 1525 \ 1526 product(bool, UseParNewGC, false, \ 1527 "Use parallel threads in the new generation.") \ 1528 \ 1529 product(bool, ParallelGCVerbose, false, \ 1530 "Verbose output for parallel GC.") \ 1531 \ 1532 product(intx, ParallelGCBufferWastePct, 10, \ 1533 "wasted fraction of parallel allocation buffer.") \ 1534 \ 1535 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1536 "Retain parallel allocation buffers across scavenges; " \ 1537 " -- disabled because this currently conflicts with " \ 1538 " parallel card scanning under certain conditions ") \ 1539 \ 1540 product(intx, TargetPLABWastePct, 10, \ 1541 "target wasted space in last buffer as pct of overall allocation")\ 1542 \ 1543 product(uintx, PLABWeight, 75, \ 1544 "Percentage (0-100) used to weight the current sample when" \ 1545 "computing exponentially decaying average for ResizePLAB.") \ 1546 \ 1547 product(bool, ResizePLAB, true, \ 1548 "Dynamically resize (survivor space) promotion labs") \ 1549 \ 1550 product(bool, PrintPLAB, false, \ 1551 "Print (survivor space) promotion labs sizing decisions") \ 1552 \ 1553 product(intx, ParGCArrayScanChunk, 50, \ 1554 "Scan a subset and push remainder, if array is bigger than this") \ 1555 \ 1556 product(bool, ParGCUseLocalOverflow, false, \ 1557 "Instead of a global overflow list, use local overflow stacks") \ 1558 \ 1559 product(bool, ParGCTrimOverflow, true, \ 1560 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1561 \ 1562 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1563 "Whether we should simulate work queue overflow in ParNew") \ 1564 \ 1565 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1566 "An `interval' counter that determines how frequently " \ 1567 "we simulate overflow; a smaller number increases frequency") \ 1568 \ 1569 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1570 "The desired number of objects to claim from the overflow list") \ 1571 \ 1572 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1573 "The number of strides per worker thread that we divide up the " \ 1574 "card table scanning work into") \ 1575 \ 1576 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1577 "The number of cards in each chunk of the parallel chunks used " \ 1578 "during card table scanning") \ 1579 \ 1580 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1581 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1582 "parallel GC.") \ 1583 \ 1584 product(uintx, OldPLABWeight, 50, \ 1585 "Percentage (0-100) used to weight the current sample when" \ 1586 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1587 \ 1588 product(bool, ResizeOldPLAB, true, \ 1589 "Dynamically resize (old gen) promotion labs") \ 1590 \ 1591 product(bool, PrintOldPLAB, false, \ 1592 "Print (old gen) promotion labs sizing decisions") \ 1593 \ 1594 product(uintx, CMSOldPLABMin, 16, \ 1595 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1596 \ 1597 product(uintx, CMSOldPLABMax, 1024, \ 1598 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1599 \ 1600 product(uintx, CMSOldPLABNumRefills, 4, \ 1601 "Nominal number of refills of CMS gen promotion lab cache" \ 1602 " per worker per block size") \ 1603 \ 1604 product(bool, CMSOldPLABResizeQuicker, false, \ 1605 "Whether to react on-the-fly during a scavenge to a sudden" \ 1606 " change in block demand rate") \ 1607 \ 1608 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1609 "The tolerance of the phase-change detector for on-the-fly" \ 1610 " PLAB resizing during a scavenge") \ 1611 \ 1612 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1613 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1614 " during a scavenge") \ 1615 \ 1616 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1617 "The clamping of the gain in the feedback loop for on-the-fly" \ 1618 " PLAB resizing during a scavenge") \ 1619 \ 1620 product(bool, AlwaysPreTouch, false, \ 1621 "It forces all freshly committed pages to be pre-touched.") \ 1622 \ 1623 product_pd(intx, CMSYoungGenPerWorker, \ 1624 "The maximum size of young gen chosen by default per GC worker " \ 1625 "thread available") \ 1626 \ 1627 product(bool, GCOverheadReporting, false, \ 1628 "Enables the GC overhead reporting facility") \ 1629 \ 1630 product(intx, GCOverheadReportingPeriodMS, 100, \ 1631 "Reporting period for conc GC overhead reporting, in ms ") \ 1632 \ 1633 product(bool, CMSIncrementalMode, false, \ 1634 "Whether CMS GC should operate in \"incremental\" mode") \ 1635 \ 1636 product(uintx, CMSIncrementalDutyCycle, 10, \ 1637 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1638 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1639 "value") \ 1640 \ 1641 product(bool, CMSIncrementalPacing, true, \ 1642 "Whether the CMS incremental mode duty cycle should be " \ 1643 "automatically adjusted") \ 1644 \ 1645 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1646 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1647 "enabled (a percentage, 0-100)") \ 1648 \ 1649 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1650 "Percentage (0-100) used to add conservatism when computing the " \ 1651 "duty cycle") \ 1652 \ 1653 product(uintx, CMSIncrementalOffset, 0, \ 1654 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1655 " is shifted to the right within the period between young GCs") \ 1656 \ 1657 product(uintx, CMSExpAvgFactor, 50, \ 1658 "Percentage (0-100) used to weight the current sample when" \ 1659 "computing exponential averages for CMS statistics.") \ 1660 \ 1661 product(uintx, CMS_FLSWeight, 75, \ 1662 "Percentage (0-100) used to weight the current sample when" \ 1663 "computing exponentially decating averages for CMS FLS statistics.") \ 1664 \ 1665 product(uintx, CMS_FLSPadding, 1, \ 1666 "The multiple of deviation from mean to use for buffering" \ 1667 "against volatility in free list demand.") \ 1668 \ 1669 product(uintx, FLSCoalescePolicy, 2, \ 1670 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1671 \ 1672 product(bool, FLSAlwaysCoalesceLarge, false, \ 1673 "CMS: Larger free blocks are always available for coalescing") \ 1674 \ 1675 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1676 "CMS: the smaller the percentage the greater the coalition force")\ 1677 \ 1678 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1679 "CMS: the factor by which to inflate estimated demand of small" \ 1680 " block sizes to prevent coalescing with an adjoining block") \ 1681 \ 1682 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1683 "CMS: the factor by which to inflate estimated demand of large" \ 1684 " block sizes to prevent coalescing with an adjoining block") \ 1685 \ 1686 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1687 "CMS: the factor by which to inflate estimated demand of small" \ 1688 " block sizes to prevent splitting to supply demand for smaller" \ 1689 " blocks") \ 1690 \ 1691 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1692 "CMS: the factor by which to inflate estimated demand of large" \ 1693 " block sizes to prevent splitting to supply demand for smaller" \ 1694 " blocks") \ 1695 \ 1696 product(bool, CMSExtrapolateSweep, false, \ 1697 "CMS: cushion for block demand during sweep") \ 1698 \ 1699 product(uintx, CMS_SweepWeight, 75, \ 1700 "Percentage (0-100) used to weight the current sample when " \ 1701 "computing exponentially decaying average for inter-sweep " \ 1702 "duration") \ 1703 \ 1704 product(uintx, CMS_SweepPadding, 1, \ 1705 "The multiple of deviation from mean to use for buffering " \ 1706 "against volatility in inter-sweep duration.") \ 1707 \ 1708 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1709 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1710 "duration exceeds this threhold in milliseconds") \ 1711 \ 1712 develop(bool, CMSTraceIncrementalMode, false, \ 1713 "Trace CMS incremental mode") \ 1714 \ 1715 develop(bool, CMSTraceIncrementalPacing, false, \ 1716 "Trace CMS incremental mode pacing computation") \ 1717 \ 1718 develop(bool, CMSTraceThreadState, false, \ 1719 "Trace the CMS thread state (enable the trace_state() method)") \ 1720 \ 1721 product(bool, CMSClassUnloadingEnabled, false, \ 1722 "Whether class unloading enabled when using CMS GC") \ 1723 \ 1724 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1725 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1726 " for which classes may not be unloaded") \ 1727 \ 1728 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1729 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1730 \ 1731 product(bool, UseCMSCompactAtFullCollection, true, \ 1732 "Use mark sweep compact at full collections") \ 1733 \ 1734 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1735 "Number of CMS full collection done before compaction if > 0") \ 1736 \ 1737 develop(intx, CMSDictionaryChoice, 0, \ 1738 "Use BinaryTreeDictionary as default in the CMS generation") \ 1739 \ 1740 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1741 "Replenish an indexed free list with this number of chunks") \ 1742 \ 1743 product(bool, CMSReplenishIntermediate, true, \ 1744 "Replenish all intermediate free-list caches") \ 1745 \ 1746 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1747 "When satisfying batched demand, split blocks from the " \ 1748 "IndexedFreeList whose size is a multiple of requested size") \ 1749 \ 1750 product(bool, CMSLoopWarn, false, \ 1751 "Warn in case of excessive CMS looping") \ 1752 \ 1753 develop(bool, CMSOverflowEarlyRestoration, false, \ 1754 "Whether preserved marks should be restored early") \ 1755 \ 1756 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1757 "Size of marking stack") \ 1758 \ 1759 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1760 "Max size of marking stack") \ 1761 \ 1762 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1763 "Whether we should simulate frequent marking stack / work queue" \ 1764 " overflow") \ 1765 \ 1766 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1767 "An `interval' counter that determines how frequently" \ 1768 " we simulate overflow; a smaller number increases frequency") \ 1769 \ 1770 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1771 "(Temporary, subject to experimentation)" \ 1772 "Maximum number of abortable preclean iterations, if > 0") \ 1773 \ 1774 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1775 "(Temporary, subject to experimentation)" \ 1776 "Maximum time in abortable preclean in ms") \ 1777 \ 1778 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1779 "(Temporary, subject to experimentation)" \ 1780 "Nominal minimum work per abortable preclean iteration") \ 1781 \ 1782 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1783 "(Temporary, subject to experimentation)" \ 1784 " Time that we sleep between iterations when not given" \ 1785 " enough work per iteration") \ 1786 \ 1787 product(uintx, CMSRescanMultiple, 32, \ 1788 "Size (in cards) of CMS parallel rescan task") \ 1789 \ 1790 product(uintx, CMSConcMarkMultiple, 32, \ 1791 "Size (in cards) of CMS concurrent MT marking task") \ 1792 \ 1793 product(uintx, CMSRevisitStackSize, 1*M, \ 1794 "Size of CMS KlassKlass revisit stack") \ 1795 \ 1796 product(bool, CMSAbortSemantics, false, \ 1797 "Whether abort-on-overflow semantics is implemented") \ 1798 \ 1799 product(bool, CMSParallelRemarkEnabled, true, \ 1800 "Whether parallel remark enabled (only if ParNewGC)") \ 1801 \ 1802 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1803 "Whether parallel remark of survivor space" \ 1804 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1805 \ 1806 product(bool, CMSPLABRecordAlways, true, \ 1807 "Whether to always record survivor space PLAB bdries" \ 1808 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1809 \ 1810 product(bool, CMSConcurrentMTEnabled, true, \ 1811 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1812 \ 1813 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1814 "Whether concurrent precleaning enabled in perm gen" \ 1815 " (effective only when CMSPrecleaningEnabled is true)") \ 1816 \ 1817 product(bool, CMSPrecleaningEnabled, true, \ 1818 "Whether concurrent precleaning enabled") \ 1819 \ 1820 product(uintx, CMSPrecleanIter, 3, \ 1821 "Maximum number of precleaning iteration passes") \ 1822 \ 1823 product(uintx, CMSPrecleanNumerator, 2, \ 1824 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1825 " ratio") \ 1826 \ 1827 product(uintx, CMSPrecleanDenominator, 3, \ 1828 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1829 " ratio") \ 1830 \ 1831 product(bool, CMSPrecleanRefLists1, true, \ 1832 "Preclean ref lists during (initial) preclean phase") \ 1833 \ 1834 product(bool, CMSPrecleanRefLists2, false, \ 1835 "Preclean ref lists during abortable preclean phase") \ 1836 \ 1837 product(bool, CMSPrecleanSurvivors1, false, \ 1838 "Preclean survivors during (initial) preclean phase") \ 1839 \ 1840 product(bool, CMSPrecleanSurvivors2, true, \ 1841 "Preclean survivors during abortable preclean phase") \ 1842 \ 1843 product(uintx, CMSPrecleanThreshold, 1000, \ 1844 "Don't re-iterate if #dirty cards less than this") \ 1845 \ 1846 product(bool, CMSCleanOnEnter, true, \ 1847 "Clean-on-enter optimization for reducing number of dirty cards") \ 1848 \ 1849 product(uintx, CMSRemarkVerifyVariant, 1, \ 1850 "Choose variant (1,2) of verification following remark") \ 1851 \ 1852 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1853 "If Eden used is below this value, don't try to schedule remark") \ 1854 \ 1855 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1856 "The Eden occupancy % at which to try and schedule remark pause") \ 1857 \ 1858 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1859 "Start sampling Eden top at least before yg occupancy reaches" \ 1860 " 1/<ratio> of the size at which we plan to schedule remark") \ 1861 \ 1862 product(uintx, CMSSamplingGrain, 16*K, \ 1863 "The minimum distance between eden samples for CMS (see above)") \ 1864 \ 1865 product(bool, CMSScavengeBeforeRemark, false, \ 1866 "Attempt scavenge before the CMS remark step") \ 1867 \ 1868 develop(bool, CMSTraceSweeper, false, \ 1869 "Trace some actions of the CMS sweeper") \ 1870 \ 1871 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1872 "Don't drain below this size per parallel worker/thief") \ 1873 \ 1874 manageable(intx, CMSWaitDuration, 2000, \ 1875 "Time in milliseconds that CMS thread waits for young GC") \ 1876 \ 1877 product(bool, CMSYield, true, \ 1878 "Yield between steps of concurrent mark & sweep") \ 1879 \ 1880 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1881 "Bitmap operations should process at most this many bits" \ 1882 "between yields") \ 1883 \ 1884 product(bool, CMSDumpAtPromotionFailure, false, \ 1885 "Dump useful information about the state of the CMS old " \ 1886 " generation upon a promotion failure.") \ 1887 \ 1888 product(bool, CMSPrintChunksInDump, false, \ 1889 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1890 " more detailed information about the free chunks.") \ 1891 \ 1892 product(bool, CMSPrintObjectsInDump, false, \ 1893 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1894 " more detailed information about the allocated objects.") \ 1895 \ 1896 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1897 "Verify that all refs across the FLS boundary " \ 1898 " are to valid objects") \ 1899 \ 1900 diagnostic(bool, FLSVerifyLists, false, \ 1901 "Do lots of (expensive) FreeListSpace verification") \ 1902 \ 1903 diagnostic(bool, FLSVerifyIndexTable, false, \ 1904 "Do lots of (expensive) FLS index table verification") \ 1905 \ 1906 develop(bool, FLSVerifyDictionary, false, \ 1907 "Do lots of (expensive) FLS dictionary verification") \ 1908 \ 1909 develop(bool, VerifyBlockOffsetArray, false, \ 1910 "Do (expensive!) block offset array verification") \ 1911 \ 1912 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1913 "Maintain _unallocated_block in BlockOffsetArray" \ 1914 " (currently applicable only to CMS collector)") \ 1915 \ 1916 develop(bool, TraceCMSState, false, \ 1917 "Trace the state of the CMS collection") \ 1918 \ 1919 product(intx, RefDiscoveryPolicy, 0, \ 1920 "Whether reference-based(0) or referent-based(1)") \ 1921 \ 1922 product(bool, ParallelRefProcEnabled, false, \ 1923 "Enable parallel reference processing whenever possible") \ 1924 \ 1925 product(bool, ParallelRefProcBalancingEnabled, true, \ 1926 "Enable balancing of reference processing queues") \ 1927 \ 1928 product(intx, CMSTriggerRatio, 80, \ 1929 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1930 "allocated before a CMS collection cycle commences") \ 1931 \ 1932 product(intx, CMSTriggerPermRatio, 80, \ 1933 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1934 "is allocated before a CMS collection cycle commences, that " \ 1935 "also collects the perm generation") \ 1936 \ 1937 product(uintx, CMSBootstrapOccupancy, 50, \ 1938 "Percentage CMS generation occupancy at which to " \ 1939 "initiate CMS collection for bootstrapping collection stats") \ 1940 \ 1941 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1942 "Percentage CMS generation occupancy to start a CMS collection " \ 1943 "cycle. A negative value means that CMSTriggerRatio is used") \ 1944 \ 1945 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1946 "Percentage of the (entire) heap occupancy to start a " \ 1947 "concurrent GC cycle. It us used by GCs that trigger a " \ 1948 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1949 "not just one of the generations (e.g., G1). A value of 0 " \ 1950 "denotes 'do constant GC cycles'.") \ 1951 \ 1952 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1953 "Percentage CMS perm generation occupancy to start a " \ 1954 "CMScollection cycle. A negative value means that " \ 1955 "CMSTriggerPermRatio is used") \ 1956 \ 1957 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1958 "Only use occupancy as a crierion for starting a CMS collection") \ 1959 \ 1960 product(intx, CMSIsTooFullPercentage, 98, \ 1961 "An absolute ceiling above which CMS will always consider the " \ 1962 "perm gen ripe for collection") \ 1963 \ 1964 develop(bool, CMSTestInFreeList, false, \ 1965 "Check if the coalesced range is already in the " \ 1966 "free lists as claimed") \ 1967 \ 1968 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1969 "Check that all the garbage collected was returned to the " \ 1970 "free lists.") \ 1971 \ 1972 notproduct(bool, ScavengeALot, false, \ 1973 "Force scavenge at every Nth exit from the runtime system " \ 1974 "(N=ScavengeALotInterval)") \ 1975 \ 1976 develop(bool, FullGCALot, false, \ 1977 "Force full gc at every Nth exit from the runtime system " \ 1978 "(N=FullGCALotInterval)") \ 1979 \ 1980 notproduct(bool, GCALotAtAllSafepoints, false, \ 1981 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1982 \ 1983 product(bool, PrintPromotionFailure, false, \ 1984 "Print additional diagnostic information following " \ 1985 " promotion failure") \ 1986 \ 1987 notproduct(bool, PromotionFailureALot, false, \ 1988 "Use promotion failure handling on every youngest generation " \ 1989 "collection") \ 1990 \ 1991 develop(uintx, PromotionFailureALotCount, 1000, \ 1992 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1993 "refill attempts (ParNew) or promotion attempts " \ 1994 "(other young collectors) ") \ 1995 \ 1996 develop(uintx, PromotionFailureALotInterval, 5, \ 1997 "Total collections between promotion failures alot") \ 1998 \ 1999 experimental(intx, WorkStealingSleepMillis, 1, \ 2000 "Sleep time when sleep is used for yields") \ 2001 \ 2002 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2003 "Number of yields before a sleep is done during workstealing") \ 2004 \ 2005 experimental(uintx, WorkStealingHardSpins, 4096, \ 2006 "Number of iterations in a spin loop between checks on " \ 2007 "time out of hard spin") \ 2008 \ 2009 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2010 "Ratio of hard spins to calls to yield") \ 2011 \ 2012 product(uintx, PreserveMarkStackSize, 1024, \ 2013 "Size for stack used in promotion failure handling") \ 2014 \ 2015 develop(uintx, ObjArrayMarkingStride, 512, \ 2016 "Number of ObjArray elements to push onto the marking stack" \ 2017 "before pushing a continuation entry") \ 2018 \ 2019 notproduct(bool, ExecuteInternalVMTests, false, \ 2020 "Enable execution of internal VM tests.") \ 2021 \ 2022 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2023 \ 2024 product_pd(bool, ResizeTLAB, \ 2025 "Dynamically resize tlab size for threads") \ 2026 \ 2027 product(bool, ZeroTLAB, false, \ 2028 "Zero out the newly created TLAB") \ 2029 \ 2030 product(bool, FastTLABRefill, true, \ 2031 "Use fast TLAB refill code") \ 2032 \ 2033 product(bool, PrintTLAB, false, \ 2034 "Print various TLAB related information") \ 2035 \ 2036 product(bool, TLABStats, true, \ 2037 "Print various TLAB related information") \ 2038 \ 2039 product(bool, UseBlockZeroing, false, \ 2040 "Use special cpu instructions for block zeroing") \ 2041 \ 2042 product(intx, BlockZeroingLowLimit, 2048, \ 2043 "Minimum size in bytes when block zeroing will be used") \ 2044 \ 2045 product(bool, UseBlockCopy, false, \ 2046 "Use special cpu instructions for block copy") \ 2047 \ 2048 product(intx, BlockCopyLowLimit, 2048, \ 2049 "Minimum size in bytes when block copy will be used") \ 2050 \ 2051 product(bool, PrintRevisitStats, false, \ 2052 "Print revisit (klass and MDO) stack related information") \ 2053 \ 2054 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2055 "Enable LowMemoryProtection")) \ 2056 \ 2057 product_pd(bool, NeverActAsServerClassMachine, \ 2058 "Never act like a server-class machine") \ 2059 \ 2060 product(bool, AlwaysActAsServerClassMachine, false, \ 2061 "Always act like a server-class machine") \ 2062 \ 2063 product_pd(uint64_t, MaxRAM, \ 2064 "Real memory size (in bytes) used to set maximum heap size") \ 2065 \ 2066 product(uintx, ErgoHeapSizeLimit, 0, \ 2067 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2068 "MaxRAM / MaxRAMFraction") \ 2069 \ 2070 product(uintx, MaxRAMFraction, 4, \ 2071 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2072 "size") \ 2073 \ 2074 product(uintx, DefaultMaxRAMFraction, 4, \ 2075 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2076 "size; deprecated: to be renamed to MaxRAMFraction") \ 2077 \ 2078 product(uintx, MinRAMFraction, 2, \ 2079 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2080 "size on systems with small physical memory size") \ 2081 \ 2082 product(uintx, InitialRAMFraction, 64, \ 2083 "Fraction (1/n) of real memory used for initial heap size") \ 2084 \ 2085 product(bool, UseAutoGCSelectPolicy, false, \ 2086 "Use automatic collection selection policy") \ 2087 \ 2088 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2089 "Automatic GC selection pause threshhold in ms") \ 2090 \ 2091 product(bool, UseAdaptiveSizePolicy, true, \ 2092 "Use adaptive generation sizing policies") \ 2093 \ 2094 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2095 "Use adaptive survivor sizing policies") \ 2096 \ 2097 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2098 "Use adaptive young-old sizing policies at minor collections") \ 2099 \ 2100 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2101 "Use adaptive young-old sizing policies at major collections") \ 2102 \ 2103 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2104 "Use statistics from System.GC for adaptive size policy") \ 2105 \ 2106 product(bool, UseAdaptiveGCBoundary, false, \ 2107 "Allow young-old boundary to move") \ 2108 \ 2109 develop(bool, TraceAdaptiveGCBoundary, false, \ 2110 "Trace young-old boundary moves") \ 2111 \ 2112 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2113 "Resize the virtual spaces of the young or old generations") \ 2114 \ 2115 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2116 "Policy for changeing generation size for throughput goals") \ 2117 \ 2118 product(uintx, AdaptiveSizePausePolicy, 0, \ 2119 "Policy for changing generation size for pause goals") \ 2120 \ 2121 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2122 "Adjust tenured generation to achive a minor pause goal") \ 2123 \ 2124 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2125 "Adjust young generation to achive a major pause goal") \ 2126 \ 2127 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2128 "Number of steps where heuristics is used before data is used") \ 2129 \ 2130 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2131 "Number of collections before the adaptive sizing is started") \ 2132 \ 2133 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2134 "Collecton interval for printing information; zero => never") \ 2135 \ 2136 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2137 "Use adaptive minimum footprint as a goal") \ 2138 \ 2139 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2140 "Weight given to exponential resizing, between 0 and 100") \ 2141 \ 2142 product(uintx, AdaptiveTimeWeight, 25, \ 2143 "Weight given to time in adaptive policy, between 0 and 100") \ 2144 \ 2145 product(uintx, PausePadding, 1, \ 2146 "How much buffer to keep for pause time") \ 2147 \ 2148 product(uintx, PromotedPadding, 3, \ 2149 "How much buffer to keep for promotion failure") \ 2150 \ 2151 product(uintx, SurvivorPadding, 3, \ 2152 "How much buffer to keep for survivor overflow") \ 2153 \ 2154 product(uintx, AdaptivePermSizeWeight, 20, \ 2155 "Weight for perm gen exponential resizing, between 0 and 100") \ 2156 \ 2157 product(uintx, PermGenPadding, 3, \ 2158 "How much buffer to keep for perm gen sizing") \ 2159 \ 2160 product(uintx, ThresholdTolerance, 10, \ 2161 "Allowed collection cost difference between generations") \ 2162 \ 2163 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2164 "If collection costs are within margin, reduce both by full " \ 2165 "delta") \ 2166 \ 2167 product(uintx, YoungGenerationSizeIncrement, 20, \ 2168 "Adaptive size percentage change in young generation") \ 2169 \ 2170 product(uintx, YoungGenerationSizeSupplement, 80, \ 2171 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2172 \ 2173 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2174 "Decay factor to YoungedGenerationSizeSupplement") \ 2175 \ 2176 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2177 "Adaptive size percentage change in tenured generation") \ 2178 \ 2179 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2180 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2181 \ 2182 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2183 "Decay factor to TenuredGenerationSizeIncrement") \ 2184 \ 2185 product(uintx, MaxGCPauseMillis, max_uintx, \ 2186 "Adaptive size policy maximum GC pause time goal in msec, " \ 2187 "or (G1 Only) the max. GC time per MMU time slice") \ 2188 \ 2189 product(uintx, GCPauseIntervalMillis, 0, \ 2190 "Time slice for MMU specification") \ 2191 \ 2192 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2193 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2194 \ 2195 product(uintx, GCTimeRatio, 99, \ 2196 "Adaptive size policy application time to GC time ratio") \ 2197 \ 2198 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2199 "Adaptive size scale down factor for shrinking") \ 2200 \ 2201 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2202 "Adaptive size decays the major cost for long major intervals") \ 2203 \ 2204 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2205 "Time scale over which major costs decay") \ 2206 \ 2207 product(uintx, MinSurvivorRatio, 3, \ 2208 "Minimum ratio of young generation/survivor space size") \ 2209 \ 2210 product(uintx, InitialSurvivorRatio, 8, \ 2211 "Initial ratio of eden/survivor space size") \ 2212 \ 2213 product(uintx, BaseFootPrintEstimate, 256*M, \ 2214 "Estimate of footprint other than Java Heap") \ 2215 \ 2216 product(bool, UseGCOverheadLimit, true, \ 2217 "Use policy to limit of proportion of time spent in GC " \ 2218 "before an OutOfMemory error is thrown") \ 2219 \ 2220 product(uintx, GCTimeLimit, 98, \ 2221 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2222 "error is thrown (used with GCHeapFreeLimit)") \ 2223 \ 2224 product(uintx, GCHeapFreeLimit, 2, \ 2225 "Minimum percentage of free space after a full GC before an " \ 2226 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2227 \ 2228 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2229 "Number of consecutive collections before gc time limit fires") \ 2230 \ 2231 product(bool, PrintAdaptiveSizePolicy, false, \ 2232 "Print information about AdaptiveSizePolicy") \ 2233 \ 2234 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2235 "How far ahead to prefetch destination area (<= 0 means off)") \ 2236 \ 2237 product(intx, PrefetchScanIntervalInBytes, -1, \ 2238 "How far ahead to prefetch scan area (<= 0 means off)") \ 2239 \ 2240 product(intx, PrefetchFieldsAhead, -1, \ 2241 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2242 \ 2243 develop(bool, UsePrefetchQueue, true, \ 2244 "Use the prefetch queue during PS promotion") \ 2245 \ 2246 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2247 "Verify system before exiting") \ 2248 \ 2249 diagnostic(bool, VerifyBeforeGC, false, \ 2250 "Verify memory system before GC") \ 2251 \ 2252 diagnostic(bool, VerifyAfterGC, false, \ 2253 "Verify memory system after GC") \ 2254 \ 2255 diagnostic(bool, VerifyDuringGC, false, \ 2256 "Verify memory system during GC (between phases)") \ 2257 \ 2258 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2259 "Enable parallel memory system verification") \ 2260 \ 2261 diagnostic(bool, DeferInitialCardMark, false, \ 2262 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2263 "may arise from new_pre_store_barrier") \ 2264 \ 2265 diagnostic(bool, VerifyRememberedSets, false, \ 2266 "Verify GC remembered sets") \ 2267 \ 2268 diagnostic(bool, VerifyObjectStartArray, true, \ 2269 "Verify GC object start array if verify before/after") \ 2270 \ 2271 product(bool, DisableExplicitGC, false, \ 2272 "Tells whether calling System.gc() does a full GC") \ 2273 \ 2274 notproduct(bool, CheckMemoryInitialization, false, \ 2275 "Checks memory initialization") \ 2276 \ 2277 product(bool, CollectGen0First, false, \ 2278 "Collect youngest generation before each full GC") \ 2279 \ 2280 diagnostic(bool, BindCMSThreadToCPU, false, \ 2281 "Bind CMS Thread to CPU if possible") \ 2282 \ 2283 diagnostic(uintx, CPUForCMSThread, 0, \ 2284 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2285 \ 2286 product(bool, BindGCTaskThreadsToCPUs, false, \ 2287 "Bind GCTaskThreads to CPUs if possible") \ 2288 \ 2289 product(bool, UseGCTaskAffinity, false, \ 2290 "Use worker affinity when asking for GCTasks") \ 2291 \ 2292 product(uintx, ProcessDistributionStride, 4, \ 2293 "Stride through processors when distributing processes") \ 2294 \ 2295 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2296 "number of times the coordinator GC thread will sleep while " \ 2297 "yielding before giving up and resuming GC") \ 2298 \ 2299 product(uintx, CMSYieldSleepCount, 0, \ 2300 "number of times a GC thread (minus the coordinator) " \ 2301 "will sleep while yielding before giving up and resuming GC") \ 2302 \ 2303 /* gc tracing */ \ 2304 manageable(bool, PrintGC, false, \ 2305 "Print message at garbage collect") \ 2306 \ 2307 manageable(bool, PrintGCDetails, false, \ 2308 "Print more details at garbage collect") \ 2309 \ 2310 manageable(bool, PrintGCDateStamps, false, \ 2311 "Print date stamps at garbage collect") \ 2312 \ 2313 manageable(bool, PrintGCTimeStamps, false, \ 2314 "Print timestamps at garbage collect") \ 2315 \ 2316 product(bool, PrintGCTaskTimeStamps, false, \ 2317 "Print timestamps for individual gc worker thread tasks") \ 2318 \ 2319 develop(intx, ConcGCYieldTimeout, 0, \ 2320 "If non-zero, assert that GC threads yield within this # of ms.") \ 2321 \ 2322 notproduct(bool, TraceMarkSweep, false, \ 2323 "Trace mark sweep") \ 2324 \ 2325 product(bool, PrintReferenceGC, false, \ 2326 "Print times spent handling reference objects during GC " \ 2327 " (enabled only when PrintGCDetails)") \ 2328 \ 2329 develop(bool, TraceReferenceGC, false, \ 2330 "Trace handling of soft/weak/final/phantom references") \ 2331 \ 2332 develop(bool, TraceFinalizerRegistration, false, \ 2333 "Trace registration of final references") \ 2334 \ 2335 notproduct(bool, TraceScavenge, false, \ 2336 "Trace scavenge") \ 2337 \ 2338 product_rw(bool, TraceClassLoading, false, \ 2339 "Trace all classes loaded") \ 2340 \ 2341 product(bool, TraceClassLoadingPreorder, false, \ 2342 "Trace all classes loaded in order referenced (not loaded)") \ 2343 \ 2344 product_rw(bool, TraceClassUnloading, false, \ 2345 "Trace unloading of classes") \ 2346 \ 2347 product_rw(bool, TraceLoaderConstraints, false, \ 2348 "Trace loader constraints") \ 2349 \ 2350 product(bool, TraceGen0Time, false, \ 2351 "Trace accumulated time for Gen 0 collection") \ 2352 \ 2353 product(bool, TraceGen1Time, false, \ 2354 "Trace accumulated time for Gen 1 collection") \ 2355 \ 2356 product(bool, PrintTenuringDistribution, false, \ 2357 "Print tenuring age information") \ 2358 \ 2359 product_rw(bool, PrintHeapAtGC, false, \ 2360 "Print heap layout before and after each GC") \ 2361 \ 2362 product_rw(bool, PrintHeapAtGCExtended, false, \ 2363 "Prints extended information about the layout of the heap " \ 2364 "when -XX:+PrintHeapAtGC is set") \ 2365 \ 2366 product(bool, PrintHeapAtSIGBREAK, true, \ 2367 "Print heap layout in response to SIGBREAK") \ 2368 \ 2369 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2370 "Print a class histogram before any major stop-world GC") \ 2371 \ 2372 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2373 "Print a class histogram after any major stop-world GC") \ 2374 \ 2375 manageable(bool, PrintClassHistogram, false, \ 2376 "Print a histogram of class instances") \ 2377 \ 2378 develop(bool, TraceWorkGang, false, \ 2379 "Trace activities of work gangs") \ 2380 \ 2381 product(bool, TraceParallelOldGCTasks, false, \ 2382 "Trace multithreaded GC activity") \ 2383 \ 2384 develop(bool, TraceBlockOffsetTable, false, \ 2385 "Print BlockOffsetTable maps") \ 2386 \ 2387 develop(bool, TraceCardTableModRefBS, false, \ 2388 "Print CardTableModRefBS maps") \ 2389 \ 2390 develop(bool, TraceGCTaskManager, false, \ 2391 "Trace actions of the GC task manager") \ 2392 \ 2393 develop(bool, TraceGCTaskQueue, false, \ 2394 "Trace actions of the GC task queues") \ 2395 \ 2396 diagnostic(bool, TraceGCTaskThread, false, \ 2397 "Trace actions of the GC task threads") \ 2398 \ 2399 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2400 "Print the time taken by each parallel old gc phase." \ 2401 "PrintGCDetails must also be enabled.") \ 2402 \ 2403 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2404 "Trace parallel old gc marking phase") \ 2405 \ 2406 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2407 "Trace parallel old gc summary phase") \ 2408 \ 2409 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2410 "Trace parallel old gc compaction phase") \ 2411 \ 2412 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2413 "Trace parallel old gc dense prefix computation") \ 2414 \ 2415 develop(bool, IgnoreLibthreadGPFault, false, \ 2416 "Suppress workaround for libthread GP fault") \ 2417 \ 2418 product(bool, PrintJNIGCStalls, false, \ 2419 "Print diagnostic message when GC is stalled" \ 2420 "by JNI critical section") \ 2421 \ 2422 /* GC log rotation setting */ \ 2423 \ 2424 product(bool, UseGCLogFileRotation, false, \ 2425 "Prevent large gclog file for long running app. " \ 2426 "Requires -Xloggc:<filename>") \ 2427 \ 2428 product(uintx, NumberOfGCLogFiles, 0, \ 2429 "Number of gclog files in rotation, " \ 2430 "Default: 0, no rotation") \ 2431 \ 2432 product(uintx, GCLogFileSize, 0, \ 2433 "GC log file size, Default: 0 bytes, no rotation " \ 2434 "Only valid with UseGCLogFileRotation") \ 2435 \ 2436 /* JVMTI heap profiling */ \ 2437 \ 2438 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2439 "Trace JVMTI object tagging calls") \ 2440 \ 2441 diagnostic(bool, VerifyBeforeIteration, false, \ 2442 "Verify memory system before JVMTI iteration") \ 2443 \ 2444 /* compiler interface */ \ 2445 \ 2446 develop(bool, CIPrintCompilerName, false, \ 2447 "when CIPrint is active, print the name of the active compiler") \ 2448 \ 2449 develop(bool, CIPrintCompileQueue, false, \ 2450 "display the contents of the compile queue whenever a " \ 2451 "compilation is enqueued") \ 2452 \ 2453 develop(bool, CIPrintRequests, false, \ 2454 "display every request for compilation") \ 2455 \ 2456 product(bool, CITime, false, \ 2457 "collect timing information for compilation") \ 2458 \ 2459 develop(bool, CITimeEach, false, \ 2460 "display timing information after each successful compilation") \ 2461 \ 2462 develop(bool, CICountOSR, true, \ 2463 "use a separate counter when assigning ids to osr compilations") \ 2464 \ 2465 develop(bool, CICompileNatives, true, \ 2466 "compile native methods if supported by the compiler") \ 2467 \ 2468 develop_pd(bool, CICompileOSR, \ 2469 "compile on stack replacement methods if supported by the " \ 2470 "compiler") \ 2471 \ 2472 develop(bool, CIPrintMethodCodes, false, \ 2473 "print method bytecodes of the compiled code") \ 2474 \ 2475 develop(bool, CIPrintTypeFlow, false, \ 2476 "print the results of ciTypeFlow analysis") \ 2477 \ 2478 develop(bool, CITraceTypeFlow, false, \ 2479 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2480 \ 2481 develop(intx, CICloneLoopTestLimit, 100, \ 2482 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2483 \ 2484 develop(intx, OSROnlyBCI, -1, \ 2485 "OSR only at this bci. Negative values mean exclude that bci") \ 2486 \ 2487 /* temp diagnostics */ \ 2488 \ 2489 diagnostic(bool, TraceRedundantCompiles, false, \ 2490 "Have compile broker print when a request already in the queue is"\ 2491 " requested again") \ 2492 \ 2493 diagnostic(bool, InitialCompileFast, false, \ 2494 "Initial compile at CompLevel_fast_compile") \ 2495 \ 2496 diagnostic(bool, InitialCompileReallyFast, false, \ 2497 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2498 \ 2499 diagnostic(bool, FullProfileOnReInterpret, true, \ 2500 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2501 \ 2502 /* compiler */ \ 2503 \ 2504 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2505 "Number of compiler threads to run") \ 2506 \ 2507 product(intx, CompilationPolicyChoice, 0, \ 2508 "which compilation policy (0/1)") \ 2509 \ 2510 develop(bool, UseStackBanging, true, \ 2511 "use stack banging for stack overflow checks (required for " \ 2512 "proper StackOverflow handling; disable only to measure cost " \ 2513 "of stackbanging)") \ 2514 \ 2515 develop(bool, Use24BitFPMode, true, \ 2516 "Set 24-bit FPU mode on a per-compile basis ") \ 2517 \ 2518 develop(bool, Use24BitFP, true, \ 2519 "use FP instructions that produce 24-bit precise results") \ 2520 \ 2521 develop(bool, UseStrictFP, true, \ 2522 "use strict fp if modifier strictfp is set") \ 2523 \ 2524 develop(bool, GenerateSynchronizationCode, true, \ 2525 "generate locking/unlocking code for synchronized methods and " \ 2526 "monitors") \ 2527 \ 2528 develop(bool, GenerateCompilerNullChecks, true, \ 2529 "Generate explicit null checks for loads/stores/calls") \ 2530 \ 2531 develop(bool, GenerateRangeChecks, true, \ 2532 "Generate range checks for array accesses") \ 2533 \ 2534 develop_pd(bool, ImplicitNullChecks, \ 2535 "generate code for implicit null checks") \ 2536 \ 2537 product(bool, PrintSafepointStatistics, false, \ 2538 "print statistics about safepoint synchronization") \ 2539 \ 2540 product(intx, PrintSafepointStatisticsCount, 300, \ 2541 "total number of safepoint statistics collected " \ 2542 "before printing them out") \ 2543 \ 2544 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2545 "print safepoint statistics only when safepoint takes" \ 2546 " more than PrintSafepointSatisticsTimeout in millis") \ 2547 \ 2548 product(bool, TraceSafepointCleanupTime, false, \ 2549 "print the break down of clean up tasks performed during" \ 2550 " safepoint") \ 2551 \ 2552 develop(bool, InlineAccessors, true, \ 2553 "inline accessor methods (get/set)") \ 2554 \ 2555 product(bool, Inline, true, \ 2556 "enable inlining") \ 2557 \ 2558 product(bool, ClipInlining, true, \ 2559 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2560 \ 2561 develop(bool, UseCHA, true, \ 2562 "enable CHA") \ 2563 \ 2564 product(bool, UseTypeProfile, true, \ 2565 "Check interpreter profile for historically monomorphic calls") \ 2566 \ 2567 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2568 "% of major receiver type to all profiled receivers") \ 2569 \ 2570 notproduct(bool, TimeCompiler, false, \ 2571 "time the compiler") \ 2572 \ 2573 notproduct(bool, TimeCompiler2, false, \ 2574 "detailed time the compiler (requires +TimeCompiler)") \ 2575 \ 2576 diagnostic(bool, PrintInlining, false, \ 2577 "prints inlining optimizations") \ 2578 \ 2579 diagnostic(bool, PrintIntrinsics, false, \ 2580 "prints attempted and successful inlining of intrinsics") \ 2581 \ 2582 product(bool, UseCountLeadingZerosInstruction, false, \ 2583 "Use count leading zeros instruction") \ 2584 \ 2585 product(bool, UsePopCountInstruction, false, \ 2586 "Use population count instruction") \ 2587 \ 2588 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2589 "do not expand intrinsics whose (internal) names appear here") \ 2590 \ 2591 develop(bool, StressReflectiveCode, false, \ 2592 "Use inexact types at allocations, etc., to test reflection") \ 2593 \ 2594 develop(bool, EagerInitialization, false, \ 2595 "Eagerly initialize classes if possible") \ 2596 \ 2597 develop(bool, TraceMethodReplacement, false, \ 2598 "Print when methods are replaced do to recompilation") \ 2599 \ 2600 develop(bool, PrintMethodFlushing, false, \ 2601 "print the nmethods being flushed") \ 2602 \ 2603 notproduct(bool, LogMultipleMutexLocking, false, \ 2604 "log locking and unlocking of mutexes (only if multiple locks " \ 2605 "are held)") \ 2606 \ 2607 develop(bool, UseRelocIndex, false, \ 2608 "use an index to speed random access to relocations") \ 2609 \ 2610 develop(bool, StressCodeBuffers, false, \ 2611 "Exercise code buffer expansion and other rare state changes") \ 2612 \ 2613 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2614 "Generate extra debugging info for non-safepoints in nmethods") \ 2615 \ 2616 diagnostic(bool, DebugInlinedCalls, true, \ 2617 "If false, restricts profiled locations to the root method only") \ 2618 \ 2619 product(bool, PrintVMOptions, false, \ 2620 "Print flags that appeared on the command line") \ 2621 \ 2622 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2623 "Ignore unrecognized VM options") \ 2624 \ 2625 product(bool, PrintCommandLineFlags, false, \ 2626 "Print flags specified on command line or set by ergonomics") \ 2627 \ 2628 product(bool, PrintFlagsInitial, false, \ 2629 "Print all VM flags before argument processing and exit VM") \ 2630 \ 2631 product(bool, PrintFlagsFinal, false, \ 2632 "Print all VM flags after argument and ergonomic processing") \ 2633 \ 2634 notproduct(bool, PrintFlagsWithComments, false, \ 2635 "Print all VM flags with default values and descriptions and exit")\ 2636 \ 2637 diagnostic(bool, SerializeVMOutput, true, \ 2638 "Use a mutex to serialize output to tty and hotspot.log") \ 2639 \ 2640 diagnostic(bool, DisplayVMOutput, true, \ 2641 "Display all VM output on the tty, independently of LogVMOutput") \ 2642 \ 2643 diagnostic(bool, LogVMOutput, trueInDebug, \ 2644 "Save VM output to hotspot.log, or to LogFile") \ 2645 \ 2646 diagnostic(ccstr, LogFile, NULL, \ 2647 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2648 \ 2649 product(ccstr, ErrorFile, NULL, \ 2650 "If an error occurs, save the error data to this file " \ 2651 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2652 \ 2653 product(bool, DisplayVMOutputToStderr, false, \ 2654 "If DisplayVMOutput is true, display all VM output to stderr") \ 2655 \ 2656 product(bool, DisplayVMOutputToStdout, false, \ 2657 "If DisplayVMOutput is true, display all VM output to stdout") \ 2658 \ 2659 product(bool, UseHeavyMonitors, false, \ 2660 "use heavyweight instead of lightweight Java monitors") \ 2661 \ 2662 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2663 "print histogram of the symbol table") \ 2664 \ 2665 notproduct(bool, ExitVMOnVerifyError, false, \ 2666 "standard exit from VM if bytecode verify error " \ 2667 "(only in debug mode)") \ 2668 \ 2669 notproduct(ccstr, AbortVMOnException, NULL, \ 2670 "Call fatal if this exception is thrown. Example: " \ 2671 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2672 \ 2673 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2674 "Call fatal if the exception pointed by AbortVMOnException " \ 2675 "has this message.") \ 2676 \ 2677 develop(bool, DebugVtables, false, \ 2678 "add debugging code to vtable dispatch") \ 2679 \ 2680 develop(bool, PrintVtables, false, \ 2681 "print vtables when printing klass") \ 2682 \ 2683 notproduct(bool, PrintVtableStats, false, \ 2684 "print vtables stats at end of run") \ 2685 \ 2686 develop(bool, TraceCreateZombies, false, \ 2687 "trace creation of zombie nmethods") \ 2688 \ 2689 notproduct(bool, IgnoreLockingAssertions, false, \ 2690 "disable locking assertions (for speed)") \ 2691 \ 2692 notproduct(bool, VerifyLoopOptimizations, false, \ 2693 "verify major loop optimizations") \ 2694 \ 2695 product(bool, RangeCheckElimination, true, \ 2696 "Split loop iterations to eliminate range checks") \ 2697 \ 2698 develop_pd(bool, UncommonNullCast, \ 2699 "track occurrences of null in casts; adjust compiler tactics") \ 2700 \ 2701 develop(bool, TypeProfileCasts, true, \ 2702 "treat casts like calls for purposes of type profiling") \ 2703 \ 2704 develop(bool, MonomorphicArrayCheck, true, \ 2705 "Uncommon-trap array store checks that require full type check") \ 2706 \ 2707 diagnostic(bool, ProfileDynamicTypes, true, \ 2708 "do extra type profiling and use it more aggressively") \ 2709 \ 2710 develop(bool, DelayCompilationDuringStartup, true, \ 2711 "Delay invoking the compiler until main application class is " \ 2712 "loaded") \ 2713 \ 2714 develop(bool, CompileTheWorld, false, \ 2715 "Compile all methods in all classes in bootstrap class path " \ 2716 "(stress test)") \ 2717 \ 2718 develop(bool, CompileTheWorldPreloadClasses, true, \ 2719 "Preload all classes used by a class before start loading") \ 2720 \ 2721 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2722 "Force a safepoint every n compiles so sweeper can keep up") \ 2723 \ 2724 develop(bool, TraceIterativeGVN, false, \ 2725 "Print progress during Iterative Global Value Numbering") \ 2726 \ 2727 develop(bool, FillDelaySlots, true, \ 2728 "Fill delay slots (on SPARC only)") \ 2729 \ 2730 develop(bool, VerifyIterativeGVN, false, \ 2731 "Verify Def-Use modifications during sparse Iterative Global " \ 2732 "Value Numbering") \ 2733 \ 2734 notproduct(bool, TracePhaseCCP, false, \ 2735 "Print progress during Conditional Constant Propagation") \ 2736 \ 2737 develop(bool, TimeLivenessAnalysis, false, \ 2738 "Time computation of bytecode liveness analysis") \ 2739 \ 2740 develop(bool, TraceLivenessGen, false, \ 2741 "Trace the generation of liveness analysis information") \ 2742 \ 2743 notproduct(bool, TraceLivenessQuery, false, \ 2744 "Trace queries of liveness analysis information") \ 2745 \ 2746 notproduct(bool, CollectIndexSetStatistics, false, \ 2747 "Collect information about IndexSets") \ 2748 \ 2749 develop(bool, PrintDominators, false, \ 2750 "Print out dominator trees for GVN") \ 2751 \ 2752 develop(bool, UseLoopSafepoints, true, \ 2753 "Generate Safepoint nodes in every loop") \ 2754 \ 2755 notproduct(bool, TraceCISCSpill, false, \ 2756 "Trace allocators use of cisc spillable instructions") \ 2757 \ 2758 notproduct(bool, TraceSpilling, false, \ 2759 "Trace spilling") \ 2760 \ 2761 product(bool, SplitIfBlocks, true, \ 2762 "Clone compares and control flow through merge points to fold " \ 2763 "some branches") \ 2764 \ 2765 develop(intx, FastAllocateSizeLimit, 128*K, \ 2766 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2767 "Inline allocations larger than this in doublewords must go slow")\ 2768 \ 2769 product(bool, AggressiveOpts, false, \ 2770 "Enable aggressive optimizations - see arguments.cpp") \ 2771 \ 2772 product(bool, UseStringCache, false, \ 2773 "Enable String cache capabilities on String.java") \ 2774 \ 2775 /* statistics */ \ 2776 develop(bool, CountCompiledCalls, false, \ 2777 "counts method invocations") \ 2778 \ 2779 notproduct(bool, CountRuntimeCalls, false, \ 2780 "counts VM runtime calls") \ 2781 \ 2782 develop(bool, CountJNICalls, false, \ 2783 "counts jni method invocations") \ 2784 \ 2785 notproduct(bool, CountJVMCalls, false, \ 2786 "counts jvm method invocations") \ 2787 \ 2788 notproduct(bool, CountRemovableExceptions, false, \ 2789 "count exceptions that could be replaced by branches due to " \ 2790 "inlining") \ 2791 \ 2792 notproduct(bool, ICMissHistogram, false, \ 2793 "produce histogram of IC misses") \ 2794 \ 2795 notproduct(bool, PrintClassStatistics, false, \ 2796 "prints class statistics at end of run") \ 2797 \ 2798 notproduct(bool, PrintMethodStatistics, false, \ 2799 "prints method statistics at end of run") \ 2800 \ 2801 /* interpreter */ \ 2802 develop(bool, ClearInterpreterLocals, false, \ 2803 "Always clear local variables of interpreter activations upon " \ 2804 "entry") \ 2805 \ 2806 product_pd(bool, RewriteBytecodes, \ 2807 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2808 \ 2809 product_pd(bool, RewriteFrequentPairs, \ 2810 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2811 \ 2812 diagnostic(bool, PrintInterpreter, false, \ 2813 "Prints the generated interpreter code") \ 2814 \ 2815 product(bool, UseInterpreter, true, \ 2816 "Use interpreter for non-compiled methods") \ 2817 \ 2818 develop(bool, UseFastSignatureHandlers, true, \ 2819 "Use fast signature handlers for native calls") \ 2820 \ 2821 develop(bool, UseV8InstrsOnly, false, \ 2822 "Use SPARC-V8 Compliant instruction subset") \ 2823 \ 2824 product(bool, UseNiagaraInstrs, false, \ 2825 "Use Niagara-efficient instruction subset") \ 2826 \ 2827 develop(bool, UseCASForSwap, false, \ 2828 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2829 \ 2830 product(bool, UseLoopCounter, true, \ 2831 "Increment invocation counter on backward branch") \ 2832 \ 2833 product(bool, UseFastEmptyMethods, true, \ 2834 "Use fast method entry code for empty methods") \ 2835 \ 2836 product(bool, UseFastAccessorMethods, true, \ 2837 "Use fast method entry code for accessor methods") \ 2838 \ 2839 product_pd(bool, UseOnStackReplacement, \ 2840 "Use on stack replacement, calls runtime if invoc. counter " \ 2841 "overflows in loop") \ 2842 \ 2843 notproduct(bool, TraceOnStackReplacement, false, \ 2844 "Trace on stack replacement") \ 2845 \ 2846 develop(bool, PoisonOSREntry, true, \ 2847 "Detect abnormal calls to OSR code") \ 2848 \ 2849 product_pd(bool, PreferInterpreterNativeStubs, \ 2850 "Use always interpreter stubs for native methods invoked via " \ 2851 "interpreter") \ 2852 \ 2853 develop(bool, CountBytecodes, false, \ 2854 "Count number of bytecodes executed") \ 2855 \ 2856 develop(bool, PrintBytecodeHistogram, false, \ 2857 "Print histogram of the executed bytecodes") \ 2858 \ 2859 develop(bool, PrintBytecodePairHistogram, false, \ 2860 "Print histogram of the executed bytecode pairs") \ 2861 \ 2862 diagnostic(bool, PrintSignatureHandlers, false, \ 2863 "Print code generated for native method signature handlers") \ 2864 \ 2865 develop(bool, VerifyOops, false, \ 2866 "Do plausibility checks for oops") \ 2867 \ 2868 develop(bool, CheckUnhandledOops, false, \ 2869 "Check for unhandled oops in VM code") \ 2870 \ 2871 develop(bool, VerifyJNIFields, trueInDebug, \ 2872 "Verify jfieldIDs for instance fields") \ 2873 \ 2874 notproduct(bool, VerifyJNIEnvThread, false, \ 2875 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2876 "from JNI") \ 2877 \ 2878 develop(bool, VerifyFPU, false, \ 2879 "Verify FPU state (check for NaN's, etc.)") \ 2880 \ 2881 develop(bool, VerifyThread, false, \ 2882 "Watch the thread register for corruption (SPARC only)") \ 2883 \ 2884 develop(bool, VerifyActivationFrameSize, false, \ 2885 "Verify that activation frame didn't become smaller than its " \ 2886 "minimal size") \ 2887 \ 2888 develop(bool, TraceFrequencyInlining, false, \ 2889 "Trace frequency based inlining") \ 2890 \ 2891 notproduct(bool, TraceTypeProfile, false, \ 2892 "Trace type profile") \ 2893 \ 2894 develop_pd(bool, InlineIntrinsics, \ 2895 "Inline intrinsics that can be statically resolved") \ 2896 \ 2897 product_pd(bool, ProfileInterpreter, \ 2898 "Profile at the bytecode level during interpretation") \ 2899 \ 2900 develop_pd(bool, ProfileTraps, \ 2901 "Profile deoptimization traps at the bytecode level") \ 2902 \ 2903 product(intx, ProfileMaturityPercentage, 20, \ 2904 "number of method invocations/branches (expressed as % of " \ 2905 "CompileThreshold) before using the method's profile") \ 2906 \ 2907 develop(bool, PrintMethodData, false, \ 2908 "Print the results of +ProfileInterpreter at end of run") \ 2909 \ 2910 develop(bool, VerifyDataPointer, trueInDebug, \ 2911 "Verify the method data pointer during interpreter profiling") \ 2912 \ 2913 develop(bool, VerifyCompiledCode, false, \ 2914 "Include miscellaneous runtime verifications in nmethod code; " \ 2915 "default off because it disturbs nmethod size heuristics") \ 2916 \ 2917 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2918 "Manually make GC thread crash then dump java stack trace; " \ 2919 "Test only") \ 2920 \ 2921 /* compilation */ \ 2922 product(bool, UseCompiler, true, \ 2923 "use compilation") \ 2924 \ 2925 develop(bool, TraceCompilationPolicy, false, \ 2926 "Trace compilation policy") \ 2927 \ 2928 develop(bool, TimeCompilationPolicy, false, \ 2929 "Time the compilation policy") \ 2930 \ 2931 product(bool, UseCounterDecay, true, \ 2932 "adjust recompilation counters") \ 2933 \ 2934 develop(intx, CounterHalfLifeTime, 30, \ 2935 "half-life time of invocation counters (in secs)") \ 2936 \ 2937 develop(intx, CounterDecayMinIntervalLength, 500, \ 2938 "Min. ms. between invocation of CounterDecay") \ 2939 \ 2940 product(bool, AlwaysCompileLoopMethods, false, \ 2941 "when using recompilation, never interpret methods " \ 2942 "containing loops") \ 2943 \ 2944 product(bool, DontCompileHugeMethods, true, \ 2945 "don't compile methods > HugeMethodLimit") \ 2946 \ 2947 /* Bytecode escape analysis estimation. */ \ 2948 product(bool, EstimateArgEscape, true, \ 2949 "Analyze bytecodes to estimate escape state of arguments") \ 2950 \ 2951 product(intx, BCEATraceLevel, 0, \ 2952 "How much tracing to do of bytecode escape analysis estimates") \ 2953 \ 2954 product(intx, MaxBCEAEstimateLevel, 5, \ 2955 "Maximum number of nested calls that are analyzed by BC EA.") \ 2956 \ 2957 product(intx, MaxBCEAEstimateSize, 150, \ 2958 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2959 \ 2960 product(intx, AllocatePrefetchStyle, 1, \ 2961 "0 = no prefetch, " \ 2962 "1 = prefetch instructions for each allocation, " \ 2963 "2 = use TLAB watermark to gate allocation prefetch, " \ 2964 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2965 \ 2966 product(intx, AllocatePrefetchDistance, -1, \ 2967 "Distance to prefetch ahead of allocation pointer") \ 2968 \ 2969 product(intx, AllocatePrefetchLines, 3, \ 2970 "Number of lines to prefetch ahead of array allocation pointer") \ 2971 \ 2972 product(intx, AllocateInstancePrefetchLines, 1, \ 2973 "Number of lines to prefetch ahead of instance allocation pointer") \ 2974 \ 2975 product(intx, AllocatePrefetchStepSize, 16, \ 2976 "Step size in bytes of sequential prefetch instructions") \ 2977 \ 2978 product(intx, AllocatePrefetchInstr, 0, \ 2979 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2980 \ 2981 product(intx, ReadPrefetchInstr, 0, \ 2982 "Prefetch instruction to prefetch ahead") \ 2983 \ 2984 product(uintx, ArraycopySrcPrefetchDistance, 0, \ 2985 "Distance to prefetch source array in arracopy") \ 2986 \ 2987 product(uintx, ArraycopyDstPrefetchDistance, 0, \ 2988 "Distance to prefetch destination array in arracopy") \ 2989 \ 2990 /* deoptimization */ \ 2991 develop(bool, TraceDeoptimization, false, \ 2992 "Trace deoptimization") \ 2993 \ 2994 develop(bool, DebugDeoptimization, false, \ 2995 "Tracing various information while debugging deoptimization") \ 2996 \ 2997 product(intx, SelfDestructTimer, 0, \ 2998 "Will cause VM to terminate after a given time (in minutes) " \ 2999 "(0 means off)") \ 3000 \ 3001 product(intx, MaxJavaStackTraceDepth, 1024, \ 3002 "Max. no. of lines in the stack trace for Java exceptions " \ 3003 "(0 means all)") \ 3004 \ 3005 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3006 "Guarantee a safepoint (at least) every so many milliseconds " \ 3007 "(0 means none)")) \ 3008 \ 3009 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3010 "Guarantee a safepoint (at least) every so many milliseconds " \ 3011 "(0 means none)")) \ 3012 \ 3013 product(intx, SafepointTimeoutDelay, 10000, \ 3014 "Delay in milliseconds for option SafepointTimeout") \ 3015 \ 3016 product(intx, NmethodSweepFraction, 16, \ 3017 "Number of invocations of sweeper to cover all nmethods") \ 3018 \ 3019 product(intx, NmethodSweepCheckInterval, 5, \ 3020 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3021 \ 3022 notproduct(bool, LogSweeper, false, \ 3023 "Keep a ring buffer of sweeper activity") \ 3024 \ 3025 notproduct(intx, SweeperLogEntries, 1024, \ 3026 "Number of records in the ring buffer of sweeper activity") \ 3027 \ 3028 notproduct(intx, MemProfilingInterval, 500, \ 3029 "Time between each invocation of the MemProfiler") \ 3030 \ 3031 develop(intx, MallocCatchPtr, -1, \ 3032 "Hit breakpoint when mallocing/freeing this pointer") \ 3033 \ 3034 notproduct(intx, AssertRepeat, 1, \ 3035 "number of times to evaluate expression in assert " \ 3036 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3037 \ 3038 notproduct(ccstrlist, SuppressErrorAt, "", \ 3039 "List of assertions (file:line) to muzzle") \ 3040 \ 3041 notproduct(uintx, HandleAllocationLimit, 1024, \ 3042 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3043 "is used") \ 3044 \ 3045 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3046 "Threshold for total handle allocation when " \ 3047 "+TraceHandleAllocation is used") \ 3048 \ 3049 develop(intx, StackPrintLimit, 100, \ 3050 "number of stack frames to print in VM-level stack dump") \ 3051 \ 3052 notproduct(intx, MaxElementPrintSize, 256, \ 3053 "maximum number of elements to print") \ 3054 \ 3055 notproduct(intx, MaxSubklassPrintSize, 4, \ 3056 "maximum number of subklasses to print when printing klass") \ 3057 \ 3058 product(intx, MaxInlineLevel, 9, \ 3059 "maximum number of nested calls that are inlined") \ 3060 \ 3061 product(intx, MaxRecursiveInlineLevel, 1, \ 3062 "maximum number of nested recursive calls that are inlined") \ 3063 \ 3064 product_pd(intx, InlineSmallCode, \ 3065 "Only inline already compiled methods if their code size is " \ 3066 "less than this") \ 3067 \ 3068 product(intx, MaxInlineSize, 35, \ 3069 "maximum bytecode size of a method to be inlined") \ 3070 \ 3071 product_pd(intx, FreqInlineSize, \ 3072 "maximum bytecode size of a frequent method to be inlined") \ 3073 \ 3074 product(intx, MaxTrivialSize, 6, \ 3075 "maximum bytecode size of a trivial method to be inlined") \ 3076 \ 3077 product(intx, MinInliningThreshold, 250, \ 3078 "min. invocation count a method needs to have to be inlined") \ 3079 \ 3080 develop(intx, AlignEntryCode, 4, \ 3081 "aligns entry code to specified value (in bytes)") \ 3082 \ 3083 develop(intx, MethodHistogramCutoff, 100, \ 3084 "cutoff value for method invoc. histogram (+CountCalls)") \ 3085 \ 3086 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3087 "# of interpreted methods to show in profile") \ 3088 \ 3089 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3090 "# of compiled methods to show in profile") \ 3091 \ 3092 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3093 "# of stub methods to show in profile") \ 3094 \ 3095 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3096 "# of runtime stub nodes to show in profile") \ 3097 \ 3098 product(intx, ProfileIntervalsTicks, 100, \ 3099 "# of ticks between printing of interval profile " \ 3100 "(+ProfileIntervals)") \ 3101 \ 3102 notproduct(intx, ScavengeALotInterval, 1, \ 3103 "Interval between which scavenge will occur with +ScavengeALot") \ 3104 \ 3105 notproduct(intx, FullGCALotInterval, 1, \ 3106 "Interval between which full gc will occur with +FullGCALot") \ 3107 \ 3108 notproduct(intx, FullGCALotStart, 0, \ 3109 "For which invocation to start FullGCAlot") \ 3110 \ 3111 notproduct(intx, FullGCALotDummies, 32*K, \ 3112 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3113 "to move") \ 3114 \ 3115 develop(intx, DontYieldALotInterval, 10, \ 3116 "Interval between which yields will be dropped (milliseconds)") \ 3117 \ 3118 develop(intx, MinSleepInterval, 1, \ 3119 "Minimum sleep() interval (milliseconds) when " \ 3120 "ConvertSleepToYield is off (used for SOLARIS)") \ 3121 \ 3122 product(intx, EventLogLength, 2000, \ 3123 "maximum nof events in event log") \ 3124 \ 3125 develop(intx, ProfilerPCTickThreshold, 15, \ 3126 "Number of ticks in a PC buckets to be a hotspot") \ 3127 \ 3128 notproduct(intx, DeoptimizeALotInterval, 5, \ 3129 "Number of exits until DeoptimizeALot kicks in") \ 3130 \ 3131 notproduct(intx, ZombieALotInterval, 5, \ 3132 "Number of exits until ZombieALot kicks in") \ 3133 \ 3134 develop(bool, StressNonEntrant, false, \ 3135 "Mark nmethods non-entrant at registration") \ 3136 \ 3137 diagnostic(intx, MallocVerifyInterval, 0, \ 3138 "if non-zero, verify C heap after every N calls to " \ 3139 "malloc/realloc/free") \ 3140 \ 3141 diagnostic(intx, MallocVerifyStart, 0, \ 3142 "if non-zero, start verifying C heap after Nth call to " \ 3143 "malloc/realloc/free") \ 3144 \ 3145 product(intx, TypeProfileWidth, 2, \ 3146 "number of receiver types to record in call/cast profile") \ 3147 \ 3148 develop(intx, BciProfileWidth, 2, \ 3149 "number of return bci's to record in ret profile") \ 3150 \ 3151 product(intx, PerMethodRecompilationCutoff, 400, \ 3152 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3153 \ 3154 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3155 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3156 \ 3157 product(intx, PerMethodTrapLimit, 100, \ 3158 "Limit on traps (of one kind) in a method (includes inlines)") \ 3159 \ 3160 product(intx, PerBytecodeTrapLimit, 4, \ 3161 "Limit on traps (of one kind) at a particular BCI") \ 3162 \ 3163 develop(intx, FreqCountInvocations, 1, \ 3164 "Scaling factor for branch frequencies (deprecated)") \ 3165 \ 3166 develop(intx, InlineFrequencyRatio, 20, \ 3167 "Ratio of call site execution to caller method invocation") \ 3168 \ 3169 develop_pd(intx, InlineFrequencyCount, \ 3170 "Count of call site execution necessary to trigger frequent " \ 3171 "inlining") \ 3172 \ 3173 develop(intx, InlineThrowCount, 50, \ 3174 "Force inlining of interpreted methods that throw this often") \ 3175 \ 3176 develop(intx, InlineThrowMaxSize, 200, \ 3177 "Force inlining of throwing methods smaller than this") \ 3178 \ 3179 product(intx, AliasLevel, 3, \ 3180 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3181 "2 for class split, 3 for unique instances") \ 3182 \ 3183 develop(bool, VerifyAliases, false, \ 3184 "perform extra checks on the results of alias analysis") \ 3185 \ 3186 develop(intx, ProfilerNodeSize, 1024, \ 3187 "Size in K to allocate for the Profile Nodes of each thread") \ 3188 \ 3189 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3190 "Number of times to spin wait on a v8 atomic operation lock") \ 3191 \ 3192 product(intx, ReadSpinIterations, 100, \ 3193 "Number of read attempts before a yield (spin inner loop)") \ 3194 \ 3195 product_pd(intx, PreInflateSpin, \ 3196 "Number of times to spin wait before inflation") \ 3197 \ 3198 product(intx, PreBlockSpin, 10, \ 3199 "Number of times to spin in an inflated lock before going to " \ 3200 "an OS lock") \ 3201 \ 3202 /* gc parameters */ \ 3203 product(uintx, InitialHeapSize, 0, \ 3204 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3205 \ 3206 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3207 "Maximum heap size (in bytes)") \ 3208 \ 3209 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3210 "Initial tenured generation size (in bytes)") \ 3211 \ 3212 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3213 "Initial new generation size (in bytes)") \ 3214 \ 3215 product(uintx, MaxNewSize, max_uintx, \ 3216 "Maximum new generation size (in bytes), max_uintx means set " \ 3217 "ergonomically") \ 3218 \ 3219 product(uintx, PretenureSizeThreshold, 0, \ 3220 "Maximum size in bytes of objects allocated in DefNew " \ 3221 "generation; zero means no maximum") \ 3222 \ 3223 product(uintx, TLABSize, 0, \ 3224 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3225 \ 3226 product(uintx, MinTLABSize, 2*K, \ 3227 "Minimum allowed TLAB size (in bytes)") \ 3228 \ 3229 product(uintx, TLABAllocationWeight, 35, \ 3230 "Allocation averaging weight") \ 3231 \ 3232 product(uintx, TLABWasteTargetPercent, 1, \ 3233 "Percentage of Eden that can be wasted") \ 3234 \ 3235 product(uintx, TLABRefillWasteFraction, 64, \ 3236 "Max TLAB waste at a refill (internal fragmentation)") \ 3237 \ 3238 product(uintx, TLABWasteIncrement, 4, \ 3239 "Increment allowed waste at slow allocation") \ 3240 \ 3241 product(intx, SurvivorRatio, 8, \ 3242 "Ratio of eden/survivor space size") \ 3243 \ 3244 product(intx, NewRatio, 2, \ 3245 "Ratio of new/old generation sizes") \ 3246 \ 3247 product_pd(uintx, NewSizeThreadIncrease, \ 3248 "Additional size added to desired new generation size per " \ 3249 "non-daemon thread (in bytes)") \ 3250 \ 3251 product_pd(uintx, PermSize, \ 3252 "Initial size of permanent generation (in bytes)") \ 3253 \ 3254 product_pd(uintx, MaxPermSize, \ 3255 "Maximum size of permanent generation (in bytes)") \ 3256 \ 3257 product(uintx, MinHeapFreeRatio, 40, \ 3258 "Min percentage of heap free after GC to avoid expansion") \ 3259 \ 3260 product(uintx, MaxHeapFreeRatio, 70, \ 3261 "Max percentage of heap free after GC to avoid shrinking") \ 3262 \ 3263 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3264 "Number of milliseconds per MB of free space in the heap") \ 3265 \ 3266 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3267 "Min change in heap space due to GC (in bytes)") \ 3268 \ 3269 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3270 "Min expansion of permanent heap (in bytes)") \ 3271 \ 3272 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3273 "Max expansion of permanent heap without full GC (in bytes)") \ 3274 \ 3275 product(intx, QueuedAllocationWarningCount, 0, \ 3276 "Number of times an allocation that queues behind a GC " \ 3277 "will retry before printing a warning") \ 3278 \ 3279 diagnostic(uintx, VerifyGCStartAt, 0, \ 3280 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3281 \ 3282 diagnostic(intx, VerifyGCLevel, 0, \ 3283 "Generation level at which to start +VerifyBefore/AfterGC") \ 3284 \ 3285 develop(uintx, ExitAfterGCNum, 0, \ 3286 "If non-zero, exit after this GC.") \ 3287 \ 3288 product(intx, MaxTenuringThreshold, 15, \ 3289 "Maximum value for tenuring threshold") \ 3290 \ 3291 product(intx, InitialTenuringThreshold, 7, \ 3292 "Initial value for tenuring threshold") \ 3293 \ 3294 product(intx, TargetSurvivorRatio, 50, \ 3295 "Desired percentage of survivor space used after scavenge") \ 3296 \ 3297 product(uintx, MarkSweepDeadRatio, 5, \ 3298 "Percentage (0-100) of the old gen allowed as dead wood." \ 3299 "Serial mark sweep treats this as both the min and max value." \ 3300 "CMS uses this value only if it falls back to mark sweep." \ 3301 "Par compact uses a variable scale based on the density of the" \ 3302 "generation and treats this as the max value when the heap is" \ 3303 "either completely full or completely empty. Par compact also" \ 3304 "has a smaller default value; see arguments.cpp.") \ 3305 \ 3306 product(uintx, PermMarkSweepDeadRatio, 20, \ 3307 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3308 "See MarkSweepDeadRatio for collector-specific comments.") \ 3309 \ 3310 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3311 "How often should we fully compact the heap (ignoring the dead " \ 3312 "space parameters)") \ 3313 \ 3314 product(intx, PrintCMSStatistics, 0, \ 3315 "Statistics for CMS") \ 3316 \ 3317 product(bool, PrintCMSInitiationStatistics, false, \ 3318 "Statistics for initiating a CMS collection") \ 3319 \ 3320 product(intx, PrintFLSStatistics, 0, \ 3321 "Statistics for CMS' FreeListSpace") \ 3322 \ 3323 product(intx, PrintFLSCensus, 0, \ 3324 "Census for CMS' FreeListSpace") \ 3325 \ 3326 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3327 "Delay in ms between expansion and allocation") \ 3328 \ 3329 product(intx, DeferThrSuspendLoopCount, 4000, \ 3330 "(Unstable) Number of times to iterate in safepoint loop " \ 3331 " before blocking VM threads ") \ 3332 \ 3333 product(intx, DeferPollingPageLoopCount, -1, \ 3334 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3335 "before changing safepoint polling page to RO ") \ 3336 \ 3337 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3338 \ 3339 product(bool, PSChunkLargeArrays, true, \ 3340 "true: process large arrays in chunks") \ 3341 \ 3342 product(uintx, GCDrainStackTargetSize, 64, \ 3343 "how many entries we'll try to leave on the stack during " \ 3344 "parallel GC") \ 3345 \ 3346 /* stack parameters */ \ 3347 product_pd(intx, StackYellowPages, \ 3348 "Number of yellow zone (recoverable overflows) pages") \ 3349 \ 3350 product_pd(intx, StackRedPages, \ 3351 "Number of red zone (unrecoverable overflows) pages") \ 3352 \ 3353 product_pd(intx, StackShadowPages, \ 3354 "Number of shadow zone (for overflow checking) pages" \ 3355 " this should exceed the depth of the VM and native call stack") \ 3356 \ 3357 product_pd(intx, ThreadStackSize, \ 3358 "Thread Stack Size (in Kbytes)") \ 3359 \ 3360 product_pd(intx, VMThreadStackSize, \ 3361 "Non-Java Thread Stack Size (in Kbytes)") \ 3362 \ 3363 product_pd(intx, CompilerThreadStackSize, \ 3364 "Compiler Thread Stack Size (in Kbytes)") \ 3365 \ 3366 develop_pd(uintx, JVMInvokeMethodSlack, \ 3367 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3368 \ 3369 product(uintx, ThreadSafetyMargin, 50*M, \ 3370 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3371 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3372 "disable this feature") \ 3373 \ 3374 /* code cache parameters */ \ 3375 develop(uintx, CodeCacheSegmentSize, 64, \ 3376 "Code cache segment size (in bytes) - smallest unit of " \ 3377 "allocation") \ 3378 \ 3379 develop_pd(intx, CodeEntryAlignment, \ 3380 "Code entry alignment for generated code (in bytes)") \ 3381 \ 3382 product_pd(intx, OptoLoopAlignment, \ 3383 "Align inner loops to zero relative to this modulus") \ 3384 \ 3385 product_pd(uintx, InitialCodeCacheSize, \ 3386 "Initial code cache size (in bytes)") \ 3387 \ 3388 product_pd(uintx, ReservedCodeCacheSize, \ 3389 "Reserved code cache size (in bytes) - maximum code cache size") \ 3390 \ 3391 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3392 "When less than X space left, we stop compiling.") \ 3393 \ 3394 product_pd(uintx, CodeCacheExpansionSize, \ 3395 "Code cache expansion size (in bytes)") \ 3396 \ 3397 develop_pd(uintx, CodeCacheMinBlockLength, \ 3398 "Minimum number of segments in a code cache block.") \ 3399 \ 3400 notproduct(bool, ExitOnFullCodeCache, false, \ 3401 "Exit the VM if we fill the code cache.") \ 3402 \ 3403 product(bool, UseCodeCacheFlushing, true, \ 3404 "Attempt to clean the code cache before shutting off compiler") \ 3405 \ 3406 product(intx, MinCodeCacheFlushingInterval, 30, \ 3407 "Min number of seconds between code cache cleaning sessions") \ 3408 \ 3409 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3410 "When less than X space left, start code cache cleaning") \ 3411 \ 3412 /* interpreter debugging */ \ 3413 develop(intx, BinarySwitchThreshold, 5, \ 3414 "Minimal number of lookupswitch entries for rewriting to binary " \ 3415 "switch") \ 3416 \ 3417 develop(intx, StopInterpreterAt, 0, \ 3418 "Stops interpreter execution at specified bytecode number") \ 3419 \ 3420 develop(intx, TraceBytecodesAt, 0, \ 3421 "Traces bytecodes starting with specified bytecode number") \ 3422 \ 3423 /* compiler interface */ \ 3424 develop(intx, CIStart, 0, \ 3425 "the id of the first compilation to permit") \ 3426 \ 3427 develop(intx, CIStop, -1, \ 3428 "the id of the last compilation to permit") \ 3429 \ 3430 develop(intx, CIStartOSR, 0, \ 3431 "the id of the first osr compilation to permit " \ 3432 "(CICountOSR must be on)") \ 3433 \ 3434 develop(intx, CIStopOSR, -1, \ 3435 "the id of the last osr compilation to permit " \ 3436 "(CICountOSR must be on)") \ 3437 \ 3438 develop(intx, CIBreakAtOSR, -1, \ 3439 "id of osr compilation to break at") \ 3440 \ 3441 develop(intx, CIBreakAt, -1, \ 3442 "id of compilation to break at") \ 3443 \ 3444 product(ccstrlist, CompileOnly, "", \ 3445 "List of methods (pkg/class.name) to restrict compilation to") \ 3446 \ 3447 product(ccstr, CompileCommandFile, NULL, \ 3448 "Read compiler commands from this file [.hotspot_compiler]") \ 3449 \ 3450 product(ccstrlist, CompileCommand, "", \ 3451 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3452 \ 3453 product(bool, CICompilerCountPerCPU, false, \ 3454 "1 compiler thread for log(N CPUs)") \ 3455 \ 3456 develop(intx, CIFireOOMAt, -1, \ 3457 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3458 "(non-negative value throws OOM after this many CI accesses " \ 3459 "in each compile)") \ 3460 \ 3461 develop(intx, CIFireOOMAtDelay, -1, \ 3462 "Wait for this many CI accesses to occur in all compiles before " \ 3463 "beginning to throw OutOfMemoryErrors in each compile") \ 3464 \ 3465 notproduct(bool, CIObjectFactoryVerify, false, \ 3466 "enable potentially expensive verification in ciObjectFactory") \ 3467 \ 3468 /* Priorities */ \ 3469 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3470 \ 3471 product(intx, ThreadPriorityPolicy, 0, \ 3472 "0 : Normal. "\ 3473 " VM chooses priorities that are appropriate for normal "\ 3474 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3475 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3476 " map to lower native priority values. On Windows applications"\ 3477 " are allowed to use higher native priorities. However, with "\ 3478 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3479 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3480 " interfere with system threads. On Linux thread priorities "\ 3481 " are ignored because the OS does not support static priority "\ 3482 " in SCHED_OTHER scheduling class which is the only choice for"\ 3483 " non-root, non-realtime applications. "\ 3484 "1 : Aggressive. "\ 3485 " Java thread priorities map over to the entire range of "\ 3486 " native thread priorities. Higher Java thread priorities map "\ 3487 " to higher native thread priorities. This policy should be "\ 3488 " used with care, as sometimes it can cause performance "\ 3489 " degradation in the application and/or the entire system. On "\ 3490 " Linux this policy requires root privilege.") \ 3491 \ 3492 product(bool, ThreadPriorityVerbose, false, \ 3493 "Print priority changes") \ 3494 \ 3495 product(intx, DefaultThreadPriority, -1, \ 3496 "The native priority at which threads run if not elsewhere " \ 3497 "specified (-1 means no change)") \ 3498 \ 3499 product(intx, CompilerThreadPriority, -1, \ 3500 "The native priority at which compiler threads should run " \ 3501 "(-1 means no change)") \ 3502 \ 3503 product(intx, VMThreadPriority, -1, \ 3504 "The native priority at which the VM thread should run " \ 3505 "(-1 means no change)") \ 3506 \ 3507 product(bool, CompilerThreadHintNoPreempt, true, \ 3508 "(Solaris only) Give compiler threads an extra quanta") \ 3509 \ 3510 product(bool, VMThreadHintNoPreempt, false, \ 3511 "(Solaris only) Give VM thread an extra quanta") \ 3512 \ 3513 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3514 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3515 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3516 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3517 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3518 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3519 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3520 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3521 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3522 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3523 \ 3524 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3525 "Java thread priority 10 maps to critical scheduling priority") \ 3526 \ 3527 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3528 "Compiler thread(s) run at critical scheduling priority") \ 3529 \ 3530 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3531 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3532 \ 3533 /* compiler debugging */ \ 3534 notproduct(intx, CompileTheWorldStartAt, 1, \ 3535 "First class to consider when using +CompileTheWorld") \ 3536 \ 3537 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3538 "Last class to consider when using +CompileTheWorld") \ 3539 \ 3540 develop(intx, NewCodeParameter, 0, \ 3541 "Testing Only: Create a dedicated integer parameter before " \ 3542 "putback") \ 3543 \ 3544 /* new oopmap storage allocation */ \ 3545 develop(intx, MinOopMapAllocation, 8, \ 3546 "Minimum number of OopMap entries in an OopMapSet") \ 3547 \ 3548 /* Background Compilation */ \ 3549 develop(intx, LongCompileThreshold, 50, \ 3550 "Used with +TraceLongCompiles") \ 3551 \ 3552 product(intx, StarvationMonitorInterval, 200, \ 3553 "Pause between each check in ms") \ 3554 \ 3555 /* recompilation */ \ 3556 product_pd(intx, CompileThreshold, \ 3557 "number of interpreted method invocations before (re-)compiling") \ 3558 \ 3559 product_pd(intx, BackEdgeThreshold, \ 3560 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3561 \ 3562 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3563 "Interpreter (tier 0) invocation notification frequency.") \ 3564 \ 3565 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3566 "C1 without MDO (tier 2) invocation notification frequency.") \ 3567 \ 3568 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3569 "C1 with MDO profiling (tier 3) invocation notification " \ 3570 "frequency.") \ 3571 \ 3572 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3573 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3574 \ 3575 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3576 "Interpreter (tier 0) invocation notification frequency.") \ 3577 \ 3578 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3579 "C1 without MDO (tier 2) invocation notification frequency.") \ 3580 \ 3581 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3582 "C1 with MDO profiling (tier 3) invocation notification " \ 3583 "frequency.") \ 3584 \ 3585 product(intx, Tier2CompileThreshold, 0, \ 3586 "threshold at which tier 2 compilation is invoked") \ 3587 \ 3588 product(intx, Tier2BackEdgeThreshold, 0, \ 3589 "Back edge threshold at which tier 2 compilation is invoked") \ 3590 \ 3591 product(intx, Tier3InvocationThreshold, 200, \ 3592 "Compile if number of method invocations crosses this " \ 3593 "threshold") \ 3594 \ 3595 product(intx, Tier3MinInvocationThreshold, 100, \ 3596 "Minimum invocation to compile at tier 3") \ 3597 \ 3598 product(intx, Tier3CompileThreshold, 2000, \ 3599 "Threshold at which tier 3 compilation is invoked (invocation " \ 3600 "minimum must be satisfied.") \ 3601 \ 3602 product(intx, Tier3BackEdgeThreshold, 60000, \ 3603 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3604 \ 3605 product(intx, Tier4InvocationThreshold, 5000, \ 3606 "Compile if number of method invocations crosses this " \ 3607 "threshold") \ 3608 \ 3609 product(intx, Tier4MinInvocationThreshold, 600, \ 3610 "Minimum invocation to compile at tier 4") \ 3611 \ 3612 product(intx, Tier4CompileThreshold, 15000, \ 3613 "Threshold at which tier 4 compilation is invoked (invocation " \ 3614 "minimum must be satisfied.") \ 3615 \ 3616 product(intx, Tier4BackEdgeThreshold, 40000, \ 3617 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3618 \ 3619 product(intx, Tier3DelayOn, 5, \ 3620 "If C2 queue size grows over this amount per compiler thread " \ 3621 "stop compiling at tier 3 and start compiling at tier 2") \ 3622 \ 3623 product(intx, Tier3DelayOff, 2, \ 3624 "If C2 queue size is less than this amount per compiler thread " \ 3625 "allow methods compiled at tier 2 transition to tier 3") \ 3626 \ 3627 product(intx, Tier3LoadFeedback, 5, \ 3628 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3629 "reaches this amount per compiler thread") \ 3630 \ 3631 product(intx, Tier4LoadFeedback, 3, \ 3632 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3633 "reaches this amount per compiler thread") \ 3634 \ 3635 product(intx, TieredCompileTaskTimeout, 50, \ 3636 "Kill compile task if method was not used within " \ 3637 "given timeout in milliseconds") \ 3638 \ 3639 product(intx, TieredStopAtLevel, 4, \ 3640 "Stop at given compilation level") \ 3641 \ 3642 product(intx, Tier0ProfilingStartPercentage, 200, \ 3643 "Start profiling in interpreter if the counters exceed tier 3" \ 3644 "thresholds by the specified percentage") \ 3645 \ 3646 product(intx, TieredRateUpdateMinTime, 1, \ 3647 "Minimum rate sampling interval (in milliseconds)") \ 3648 \ 3649 product(intx, TieredRateUpdateMaxTime, 25, \ 3650 "Maximum rate sampling interval (in milliseconds)") \ 3651 \ 3652 product_pd(bool, TieredCompilation, \ 3653 "Enable tiered compilation") \ 3654 \ 3655 product(bool, PrintTieredEvents, false, \ 3656 "Print tiered events notifications") \ 3657 \ 3658 product(bool, StressTieredRuntime, false, \ 3659 "Alternate client and server compiler on compile requests") \ 3660 \ 3661 product_pd(intx, OnStackReplacePercentage, \ 3662 "NON_TIERED number of method invocations/branches (expressed as %"\ 3663 "of CompileThreshold) before (re-)compiling OSR code") \ 3664 \ 3665 product(intx, InterpreterProfilePercentage, 33, \ 3666 "NON_TIERED number of method invocations/branches (expressed as %"\ 3667 "of CompileThreshold) before profiling in the interpreter") \ 3668 \ 3669 develop(intx, MaxRecompilationSearchLength, 10, \ 3670 "max. # frames to inspect searching for recompilee") \ 3671 \ 3672 develop(intx, MaxInterpretedSearchLength, 3, \ 3673 "max. # interp. frames to skip when searching for recompilee") \ 3674 \ 3675 develop(intx, DesiredMethodLimit, 8000, \ 3676 "desired max. method size (in bytecodes) after inlining") \ 3677 \ 3678 develop(intx, HugeMethodLimit, 8000, \ 3679 "don't compile methods larger than this if " \ 3680 "+DontCompileHugeMethods") \ 3681 \ 3682 /* New JDK 1.4 reflection implementation */ \ 3683 \ 3684 develop(bool, UseNewReflection, true, \ 3685 "Temporary flag for transition to reflection based on dynamic " \ 3686 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3687 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3688 "changes were needed") \ 3689 \ 3690 develop(bool, VerifyReflectionBytecodes, false, \ 3691 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3692 "in situations like that described in 4486457 or for " \ 3693 "constructors generated for serialization, so can not be enabled "\ 3694 "in product.") \ 3695 \ 3696 product(bool, ReflectionWrapResolutionErrors, true, \ 3697 "Temporary flag for transition to AbstractMethodError wrapped " \ 3698 "in InvocationTargetException. See 6531596") \ 3699 \ 3700 \ 3701 develop(intx, FastSuperclassLimit, 8, \ 3702 "Depth of hardwired instanceof accelerator array") \ 3703 \ 3704 /* Properties for Java libraries */ \ 3705 \ 3706 product(intx, MaxDirectMemorySize, -1, \ 3707 "Maximum total size of NIO direct-buffer allocations") \ 3708 \ 3709 /* temporary developer defined flags */ \ 3710 \ 3711 diagnostic(bool, UseNewCode, false, \ 3712 "Testing Only: Use the new version while testing") \ 3713 \ 3714 diagnostic(bool, UseNewCode2, false, \ 3715 "Testing Only: Use the new version while testing") \ 3716 \ 3717 diagnostic(bool, UseNewCode3, false, \ 3718 "Testing Only: Use the new version while testing") \ 3719 \ 3720 /* flags for performance data collection */ \ 3721 \ 3722 product(bool, UsePerfData, falseInEmbedded, \ 3723 "Flag to disable jvmstat instrumentation for performance testing" \ 3724 "and problem isolation purposes.") \ 3725 \ 3726 product(bool, PerfDataSaveToFile, false, \ 3727 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3728 \ 3729 product(ccstr, PerfDataSaveFile, NULL, \ 3730 "Save PerfData memory to the specified absolute pathname," \ 3731 "%p in the file name if present will be replaced by pid") \ 3732 \ 3733 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3734 "Data sampling interval in milliseconds") \ 3735 \ 3736 develop(bool, PerfTraceDataCreation, false, \ 3737 "Trace creation of Performance Data Entries") \ 3738 \ 3739 develop(bool, PerfTraceMemOps, false, \ 3740 "Trace PerfMemory create/attach/detach calls") \ 3741 \ 3742 product(bool, PerfDisableSharedMem, false, \ 3743 "Store performance data in standard memory") \ 3744 \ 3745 product(intx, PerfDataMemorySize, 32*K, \ 3746 "Size of performance data memory region. Will be rounded " \ 3747 "up to a multiple of the native os page size.") \ 3748 \ 3749 product(intx, PerfMaxStringConstLength, 1024, \ 3750 "Maximum PerfStringConstant string length before truncation") \ 3751 \ 3752 product(bool, PerfAllowAtExitRegistration, false, \ 3753 "Allow registration of atexit() methods") \ 3754 \ 3755 product(bool, PerfBypassFileSystemCheck, false, \ 3756 "Bypass Win32 file system criteria checks (Windows Only)") \ 3757 \ 3758 product(intx, UnguardOnExecutionViolation, 0, \ 3759 "Unguard page and retry on no-execute fault (Win32 only)" \ 3760 "0=off, 1=conservative, 2=aggressive") \ 3761 \ 3762 /* Serviceability Support */ \ 3763 \ 3764 product(bool, ManagementServer, false, \ 3765 "Create JMX Management Server") \ 3766 \ 3767 product(bool, DisableAttachMechanism, false, \ 3768 "Disable mechanism that allows tools to attach to this VM") \ 3769 \ 3770 product(bool, StartAttachListener, false, \ 3771 "Always start Attach Listener at VM startup") \ 3772 \ 3773 manageable(bool, PrintConcurrentLocks, false, \ 3774 "Print java.util.concurrent locks in thread dump") \ 3775 \ 3776 product(bool, TransmitErrorReport, false, \ 3777 "Enable error report transmission on erroneous termination") \ 3778 \ 3779 product(ccstr, ErrorReportServer, NULL, \ 3780 "Override built-in error report server address") \ 3781 \ 3782 /* Shared spaces */ \ 3783 \ 3784 product(bool, UseSharedSpaces, true, \ 3785 "Use shared spaces in the permanent generation") \ 3786 \ 3787 product(bool, RequireSharedSpaces, false, \ 3788 "Require shared spaces in the permanent generation") \ 3789 \ 3790 product(bool, DumpSharedSpaces, false, \ 3791 "Special mode: JVM reads a class list, loads classes, builds " \ 3792 "shared spaces, and dumps the shared spaces to a file to be " \ 3793 "used in future JVM runs.") \ 3794 \ 3795 product(bool, PrintSharedSpaces, false, \ 3796 "Print usage of shared spaces") \ 3797 \ 3798 product(uintx, SharedDummyBlockSize, 512*M, \ 3799 "Size of dummy block used to shift heap addresses (in bytes)") \ 3800 \ 3801 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3802 "Size of read-write space in permanent generation (in bytes)") \ 3803 \ 3804 product(uintx, SharedReadOnlySize, 10*M, \ 3805 "Size of read-only space in permanent generation (in bytes)") \ 3806 \ 3807 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3808 "Size of the shared data area adjacent to the heap (in bytes)") \ 3809 \ 3810 product(uintx, SharedMiscCodeSize, 4*M, \ 3811 "Size of the shared code area adjacent to the heap (in bytes)") \ 3812 \ 3813 diagnostic(bool, SharedOptimizeColdStart, true, \ 3814 "At dump time, order shared objects to achieve better " \ 3815 "cold startup time.") \ 3816 \ 3817 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3818 "Reordering policy for SharedOptimizeColdStart " \ 3819 "0=favor classload-time locality, 1=balanced, " \ 3820 "2=favor runtime locality") \ 3821 \ 3822 diagnostic(bool, SharedSkipVerify, false, \ 3823 "Skip assert() and verify() which page-in unwanted shared " \ 3824 "objects. ") \ 3825 \ 3826 diagnostic(bool, EnableInvokeDynamic, true, \ 3827 "support JSR 292 (method handles, invokedynamic, " \ 3828 "anonymous classes") \ 3829 \ 3830 product(bool, AnonymousClasses, false, \ 3831 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3832 \ 3833 experimental(bool, EnableMethodHandles, false, \ 3834 "support method handles (deprecated)") \ 3835 \ 3836 diagnostic(intx, MethodHandlePushLimit, 3, \ 3837 "number of additional stack slots a method handle may push") \ 3838 \ 3839 diagnostic(bool, PrintMethodHandleStubs, false, \ 3840 "Print generated stub code for method handles") \ 3841 \ 3842 develop(bool, TraceMethodHandles, false, \ 3843 "trace internal method handle operations") \ 3844 \ 3845 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3846 "perform extra checks when constructing method handles") \ 3847 \ 3848 diagnostic(bool, OptimizeMethodHandles, true, \ 3849 "when constructing method handles, try to improve them") \ 3850 \ 3851 develop(bool, StressMethodHandleWalk, false, \ 3852 "Process all method handles with MethodHandleWalk") \ 3853 \ 3854 experimental(bool, TrustFinalNonStaticFields, false, \ 3855 "trust final non-static declarations for constant folding") \ 3856 \ 3857 experimental(bool, AllowInvokeGeneric, false, \ 3858 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3859 "as equivalent methods") \ 3860 \ 3861 develop(bool, TraceInvokeDynamic, false, \ 3862 "trace internal invoke dynamic operations") \ 3863 \ 3864 diagnostic(bool, PauseAtStartup, false, \ 3865 "Causes the VM to pause at startup time and wait for the pause " \ 3866 "file to be removed (default: ./vm.paused.<pid>)") \ 3867 \ 3868 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3869 "The file to create and for whose removal to await when pausing " \ 3870 "at startup. (default: ./vm.paused.<pid>)") \ 3871 \ 3872 diagnostic(bool, PauseAtExit, false, \ 3873 "Pause and wait for keypress on exit if a debugger is attached") \ 3874 \ 3875 product(bool, ExtendedDTraceProbes, false, \ 3876 "Enable performance-impacting dtrace probes") \ 3877 \ 3878 product(bool, DTraceMethodProbes, false, \ 3879 "Enable dtrace probes for method-entry and method-exit") \ 3880 \ 3881 product(bool, DTraceAllocProbes, false, \ 3882 "Enable dtrace probes for object allocation") \ 3883 \ 3884 product(bool, DTraceMonitorProbes, false, \ 3885 "Enable dtrace probes for monitor events") \ 3886 \ 3887 product(bool, RelaxAccessControlCheck, false, \ 3888 "Relax the access control checks in the verifier") \ 3889 \ 3890 diagnostic(bool, PrintDTraceDOF, false, \ 3891 "Print the DTrace DOF passed to the system for JSDT probes") \ 3892 \ 3893 product(uintx, StringTableSize, 1009, \ 3894 "Number of buckets in the interned String table") \ 3895 \ 3896 product(bool, UseVMInterruptibleIO, false, \ 3897 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3898 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3899 " of this flag is true for JDK 6 and earlier") 3900 3901/* 3902 * Macros for factoring of globals 3903 */ 3904 3905// Interface macros 3906#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3907#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3908#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3909#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3910#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3911#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3912#ifdef PRODUCT 3913#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3914#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3915#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3916#else 3917#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3918#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3919#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3920#endif 3921// Special LP64 flags, product only needed for now. 3922#ifdef _LP64 3923#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3924#else 3925#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3926#endif // _LP64 3927 3928// Implementation macros 3929#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3930#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3931#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3932#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3933#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3934#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3935#ifdef PRODUCT 3936#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3937#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3938#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3939#else 3940#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3941#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3942#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3943#endif 3944#ifdef _LP64 3945#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3946#else 3947#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3948#endif // _LP64 3949 3950RUNTIME_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG, DECLARE_MANAGEABLE_FLAG, DECLARE_PRODUCT_RW_FLAG, DECLARE_LP64_PRODUCT_FLAG) 3951 3952RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3953 3954// Extensions 3955 3956#include "runtime/globals_ext.hpp" 3957 3958#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3959