globals.hpp revision 2953:127b3692c168
1/* 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29#ifdef TARGET_ARCH_x86 30# include "globals_x86.hpp" 31#endif 32#ifdef TARGET_ARCH_sparc 33# include "globals_sparc.hpp" 34#endif 35#ifdef TARGET_ARCH_zero 36# include "globals_zero.hpp" 37#endif 38#ifdef TARGET_ARCH_arm 39# include "globals_arm.hpp" 40#endif 41#ifdef TARGET_ARCH_ppc 42# include "globals_ppc.hpp" 43#endif 44#ifdef TARGET_OS_FAMILY_linux 45# include "globals_linux.hpp" 46#endif 47#ifdef TARGET_OS_FAMILY_solaris 48# include "globals_solaris.hpp" 49#endif 50#ifdef TARGET_OS_FAMILY_windows 51# include "globals_windows.hpp" 52#endif 53#ifdef TARGET_OS_FAMILY_bsd 54# include "globals_bsd.hpp" 55#endif 56#ifdef TARGET_OS_ARCH_linux_x86 57# include "globals_linux_x86.hpp" 58#endif 59#ifdef TARGET_OS_ARCH_linux_sparc 60# include "globals_linux_sparc.hpp" 61#endif 62#ifdef TARGET_OS_ARCH_linux_zero 63# include "globals_linux_zero.hpp" 64#endif 65#ifdef TARGET_OS_ARCH_solaris_x86 66# include "globals_solaris_x86.hpp" 67#endif 68#ifdef TARGET_OS_ARCH_solaris_sparc 69# include "globals_solaris_sparc.hpp" 70#endif 71#ifdef TARGET_OS_ARCH_windows_x86 72# include "globals_windows_x86.hpp" 73#endif 74#ifdef TARGET_OS_ARCH_linux_arm 75# include "globals_linux_arm.hpp" 76#endif 77#ifdef TARGET_OS_ARCH_linux_ppc 78# include "globals_linux_ppc.hpp" 79#endif 80#ifdef TARGET_OS_ARCH_bsd_x86 81# include "globals_bsd_x86.hpp" 82#endif 83#ifdef TARGET_OS_ARCH_bsd_zero 84# include "globals_bsd_zero.hpp" 85#endif 86#ifdef COMPILER1 87#ifdef TARGET_ARCH_x86 88# include "c1_globals_x86.hpp" 89#endif 90#ifdef TARGET_ARCH_sparc 91# include "c1_globals_sparc.hpp" 92#endif 93#ifdef TARGET_ARCH_arm 94# include "c1_globals_arm.hpp" 95#endif 96#ifdef TARGET_ARCH_ppc 97# include "c1_globals_ppc.hpp" 98#endif 99#ifdef TARGET_OS_FAMILY_linux 100# include "c1_globals_linux.hpp" 101#endif 102#ifdef TARGET_OS_FAMILY_solaris 103# include "c1_globals_solaris.hpp" 104#endif 105#ifdef TARGET_OS_FAMILY_windows 106# include "c1_globals_windows.hpp" 107#endif 108#ifdef TARGET_OS_FAMILY_bsd 109# include "c1_globals_bsd.hpp" 110#endif 111#endif 112#ifdef COMPILER2 113#ifdef TARGET_ARCH_x86 114# include "c2_globals_x86.hpp" 115#endif 116#ifdef TARGET_ARCH_sparc 117# include "c2_globals_sparc.hpp" 118#endif 119#ifdef TARGET_ARCH_arm 120# include "c2_globals_arm.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_linux 123# include "c2_globals_linux.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_solaris 126# include "c2_globals_solaris.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_windows 129# include "c2_globals_windows.hpp" 130#endif 131#ifdef TARGET_OS_FAMILY_bsd 132# include "c2_globals_bsd.hpp" 133#endif 134#endif 135#ifdef SHARK 136#ifdef TARGET_ARCH_zero 137# include "shark_globals_zero.hpp" 138#endif 139#endif 140 141#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 142define_pd_global(bool, BackgroundCompilation, false); 143define_pd_global(bool, UseTLAB, false); 144define_pd_global(bool, CICompileOSR, false); 145define_pd_global(bool, UseTypeProfile, false); 146define_pd_global(bool, UseOnStackReplacement, false); 147define_pd_global(bool, InlineIntrinsics, false); 148define_pd_global(bool, PreferInterpreterNativeStubs, true); 149define_pd_global(bool, ProfileInterpreter, false); 150define_pd_global(bool, ProfileTraps, false); 151define_pd_global(bool, TieredCompilation, false); 152 153define_pd_global(intx, CompileThreshold, 0); 154define_pd_global(intx, BackEdgeThreshold, 0); 155 156define_pd_global(intx, OnStackReplacePercentage, 0); 157define_pd_global(bool, ResizeTLAB, false); 158define_pd_global(intx, FreqInlineSize, 0); 159define_pd_global(intx, InlineSmallCode, 0); 160define_pd_global(intx, NewSizeThreadIncrease, 4*K); 161define_pd_global(intx, InlineClassNatives, true); 162define_pd_global(intx, InlineUnsafeOps, true); 163define_pd_global(intx, InitialCodeCacheSize, 160*K); 164define_pd_global(intx, ReservedCodeCacheSize, 32*M); 165define_pd_global(intx, CodeCacheExpansionSize, 32*K); 166define_pd_global(intx, CodeCacheMinBlockLength, 1); 167define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 168define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 169define_pd_global(bool, NeverActAsServerClassMachine, true); 170define_pd_global(uint64_t,MaxRAM, 1ULL*G); 171#define CI_COMPILER_COUNT 0 172#else 173 174#ifdef COMPILER2 175#define CI_COMPILER_COUNT 2 176#else 177#define CI_COMPILER_COUNT 1 178#endif // COMPILER2 179 180#endif // no compilers 181 182 183// string type aliases used only in this file 184typedef const char* ccstr; 185typedef const char* ccstrlist; // represents string arguments which accumulate 186 187enum FlagValueOrigin { 188 DEFAULT = 0, 189 COMMAND_LINE = 1, 190 ENVIRON_VAR = 2, 191 CONFIG_FILE = 3, 192 MANAGEMENT = 4, 193 ERGONOMIC = 5, 194 ATTACH_ON_DEMAND = 6, 195 INTERNAL = 99 196}; 197 198struct Flag { 199 const char *type; 200 const char *name; 201 void* addr; 202 203 NOT_PRODUCT(const char *doc;) 204 205 const char *kind; 206 FlagValueOrigin origin; 207 208 // points to all Flags static array 209 static Flag *flags; 210 211 // number of flags 212 static size_t numFlags; 213 214 static Flag* find_flag(char* name, size_t length); 215 216 bool is_bool() const { return strcmp(type, "bool") == 0; } 217 bool get_bool() const { return *((bool*) addr); } 218 void set_bool(bool value) { *((bool*) addr) = value; } 219 220 bool is_intx() const { return strcmp(type, "intx") == 0; } 221 intx get_intx() const { return *((intx*) addr); } 222 void set_intx(intx value) { *((intx*) addr) = value; } 223 224 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 225 uintx get_uintx() const { return *((uintx*) addr); } 226 void set_uintx(uintx value) { *((uintx*) addr) = value; } 227 228 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 229 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 230 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 231 232 bool is_double() const { return strcmp(type, "double") == 0; } 233 double get_double() const { return *((double*) addr); } 234 void set_double(double value) { *((double*) addr) = value; } 235 236 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 237 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 238 ccstr get_ccstr() const { return *((ccstr*) addr); } 239 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 240 241 bool is_unlocker() const; 242 bool is_unlocked() const; 243 bool is_writeable() const; 244 bool is_external() const; 245 246 bool is_unlocker_ext() const; 247 bool is_unlocked_ext() const; 248 249 void print_on(outputStream* st, bool withComments = false ); 250 void print_as_flag(outputStream* st); 251}; 252 253// debug flags control various aspects of the VM and are global accessible 254 255// use FlagSetting to temporarily change some debug flag 256// e.g. FlagSetting fs(DebugThisAndThat, true); 257// restored to previous value upon leaving scope 258class FlagSetting { 259 bool val; 260 bool* flag; 261 public: 262 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 263 ~FlagSetting() { *flag = val; } 264}; 265 266 267class CounterSetting { 268 intx* counter; 269 public: 270 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 271 ~CounterSetting() { (*counter)--; } 272}; 273 274 275class IntFlagSetting { 276 intx val; 277 intx* flag; 278 public: 279 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 280 ~IntFlagSetting() { *flag = val; } 281}; 282 283 284class DoubleFlagSetting { 285 double val; 286 double* flag; 287 public: 288 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 289 ~DoubleFlagSetting() { *flag = val; } 290}; 291 292 293class CommandLineFlags { 294 public: 295 static bool boolAt(char* name, size_t len, bool* value); 296 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 297 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 298 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 299 300 static bool intxAt(char* name, size_t len, intx* value); 301 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 302 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 303 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 304 305 static bool uintxAt(char* name, size_t len, uintx* value); 306 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 307 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 308 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 309 310 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 311 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 312 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 313 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 314 315 static bool doubleAt(char* name, size_t len, double* value); 316 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 317 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 318 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 319 320 static bool ccstrAt(char* name, size_t len, ccstr* value); 321 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 322 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 323 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 324 325 // Returns false if name is not a command line flag. 326 static bool wasSetOnCmdline(const char* name, bool* value); 327 static void printSetFlags(); 328 329 static void printFlags(bool withComments = false ); 330 331 static void verify() PRODUCT_RETURN; 332}; 333 334// use this for flags that are true by default in the debug version but 335// false in the optimized version, and vice versa 336#ifdef ASSERT 337#define trueInDebug true 338#define falseInDebug false 339#else 340#define trueInDebug false 341#define falseInDebug true 342#endif 343 344// use this for flags that are true per default in the product build 345// but false in development builds, and vice versa 346#ifdef PRODUCT 347#define trueInProduct true 348#define falseInProduct false 349#else 350#define trueInProduct false 351#define falseInProduct true 352#endif 353 354// use this for flags that are true per default in the tiered build 355// but false in non-tiered builds, and vice versa 356#ifdef TIERED 357#define trueInTiered true 358#define falseInTiered false 359#else 360#define trueInTiered false 361#define falseInTiered true 362#endif 363 364#ifdef JAVASE_EMBEDDED 365#define falseInEmbedded false 366#else 367#define falseInEmbedded true 368#endif 369 370// develop flags are settable / visible only during development and are constant in the PRODUCT version 371// product flags are always settable / visible 372// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 373 374// A flag must be declared with one of the following types: 375// bool, intx, uintx, ccstr. 376// The type "ccstr" is an alias for "const char*" and is used 377// only in this file, because the macrology requires single-token type names. 378 379// Note: Diagnostic options not meant for VM tuning or for product modes. 380// They are to be used for VM quality assurance or field diagnosis 381// of VM bugs. They are hidden so that users will not be encouraged to 382// try them as if they were VM ordinary execution options. However, they 383// are available in the product version of the VM. Under instruction 384// from support engineers, VM customers can turn them on to collect 385// diagnostic information about VM problems. To use a VM diagnostic 386// option, you must first specify +UnlockDiagnosticVMOptions. 387// (This master switch also affects the behavior of -Xprintflags.) 388// 389// experimental flags are in support of features that are not 390// part of the officially supported product, but are available 391// for experimenting with. They could, for example, be performance 392// features that may not have undergone full or rigorous QA, but which may 393// help performance in some cases and released for experimentation 394// by the community of users and developers. This flag also allows one to 395// be able to build a fully supported product that nonetheless also 396// ships with some unsupported, lightly tested, experimental features. 397// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 398// UnlockExperimentalVMOptions flag, which allows the control and 399// modification of the experimental flags. 400// 401// Nota bene: neither diagnostic nor experimental options should be used casually, 402// and they are not supported on production loads, except under explicit 403// direction from support engineers. 404// 405// manageable flags are writeable external product flags. 406// They are dynamically writeable through the JDK management interface 407// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 408// These flags are external exported interface (see CCC). The list of 409// manageable flags can be queried programmatically through the management 410// interface. 411// 412// A flag can be made as "manageable" only if 413// - the flag is defined in a CCC as an external exported interface. 414// - the VM implementation supports dynamic setting of the flag. 415// This implies that the VM must *always* query the flag variable 416// and not reuse state related to the flag state at any given time. 417// - you want the flag to be queried programmatically by the customers. 418// 419// product_rw flags are writeable internal product flags. 420// They are like "manageable" flags but for internal/private use. 421// The list of product_rw flags are internal/private flags which 422// may be changed/removed in a future release. It can be set 423// through the management interface to get/set value 424// when the name of flag is supplied. 425// 426// A flag can be made as "product_rw" only if 427// - the VM implementation supports dynamic setting of the flag. 428// This implies that the VM must *always* query the flag variable 429// and not reuse state related to the flag state at any given time. 430// 431// Note that when there is a need to support develop flags to be writeable, 432// it can be done in the same way as product_rw. 433 434#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 435 \ 436 lp64_product(bool, UseCompressedOops, false, \ 437 "Use 32-bit object references in 64-bit VM. " \ 438 "lp64_product means flag is always constant in 32 bit VM") \ 439 \ 440 notproduct(bool, CheckCompressedOops, true, \ 441 "generate checks in encoding/decoding code in debug VM") \ 442 \ 443 product_pd(uintx, HeapBaseMinAddress, \ 444 "OS specific low limit for heap base address") \ 445 \ 446 diagnostic(bool, PrintCompressedOopsMode, false, \ 447 "Print compressed oops base address and encoding mode") \ 448 \ 449 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 450 "Default object alignment in bytes, 8 is minimum") \ 451 \ 452 /* UseMembar is theoretically a temp flag used for memory barrier \ 453 * removal testing. It was supposed to be removed before FCS but has \ 454 * been re-added (see 6401008) */ \ 455 product_pd(bool, UseMembar, \ 456 "(Unstable) Issues membars on thread state transitions") \ 457 \ 458 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 459 * that don't support it. This will be replaced by processor detection \ 460 * logic. \ 461 */ \ 462 product(bool, UsePPCLWSYNC, true, \ 463 "Use lwsync instruction if true, else use slower sync") \ 464 \ 465 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 466 "Whether to clean the chunk pool asynchronously") \ 467 \ 468 /* Temporary: See 6948537 */ \ 469 experimental(bool, UseMemSetInBOT, true, \ 470 "(Unstable) uses memset in BOT updates in GC code") \ 471 \ 472 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 473 "Enable normal processing of flags relating to field diagnostics")\ 474 \ 475 experimental(bool, UnlockExperimentalVMOptions, false, \ 476 "Enable normal processing of flags relating to experimental features")\ 477 \ 478 product(bool, JavaMonitorsInStackTrace, true, \ 479 "Print info. about Java monitor locks when the stacks are dumped")\ 480 \ 481 product_pd(bool, UseLargePages, \ 482 "Use large page memory") \ 483 \ 484 product_pd(bool, UseLargePagesIndividualAllocation, \ 485 "Allocate large pages individually for better affinity") \ 486 \ 487 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 488 "Fail large pages individual allocation") \ 489 \ 490 develop(bool, TracePageSizes, false, \ 491 "Trace page size selection and usage.") \ 492 \ 493 product(bool, UseNUMA, false, \ 494 "Use NUMA if available") \ 495 \ 496 product(bool, UseNUMAInterleaving, false, \ 497 "Interleave memory across NUMA nodes if available") \ 498 \ 499 product(uintx, NUMAInterleaveGranularity, 2*M, \ 500 "Granularity to use for NUMA interleaving on Windows OS") \ 501 \ 502 product(bool, ForceNUMA, false, \ 503 "Force NUMA optimizations on single-node/UMA systems") \ 504 \ 505 product(intx, NUMAChunkResizeWeight, 20, \ 506 "Percentage (0-100) used to weight the current sample when " \ 507 "computing exponentially decaying average for " \ 508 "AdaptiveNUMAChunkSizing") \ 509 \ 510 product(intx, NUMASpaceResizeRate, 1*G, \ 511 "Do not reallocate more that this amount per collection") \ 512 \ 513 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 514 "Enable adaptive chunk sizing for NUMA") \ 515 \ 516 product(bool, NUMAStats, false, \ 517 "Print NUMA stats in detailed heap information") \ 518 \ 519 product(intx, NUMAPageScanRate, 256, \ 520 "Maximum number of pages to include in the page scan procedure") \ 521 \ 522 product_pd(bool, NeedsDeoptSuspend, \ 523 "True for register window machines (sparc/ia64)") \ 524 \ 525 product(intx, UseSSE, 99, \ 526 "Highest supported SSE instructions set on x86/x64") \ 527 \ 528 product(intx, UseAVX, 99, \ 529 "Highest supported AVX instructions set on x86/x64") \ 530 \ 531 product(intx, UseVIS, 99, \ 532 "Highest supported VIS instructions set on Sparc") \ 533 \ 534 product(uintx, LargePageSizeInBytes, 0, \ 535 "Large page size (0 to let VM choose the page size") \ 536 \ 537 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 538 "Use large pages if max heap is at least this big") \ 539 \ 540 product(bool, ForceTimeHighResolution, false, \ 541 "Using high time resolution(For Win32 only)") \ 542 \ 543 develop(bool, TraceItables, false, \ 544 "Trace initialization and use of itables") \ 545 \ 546 develop(bool, TracePcPatching, false, \ 547 "Trace usage of frame::patch_pc") \ 548 \ 549 develop(bool, TraceJumps, false, \ 550 "Trace assembly jumps in thread ring buffer") \ 551 \ 552 develop(bool, TraceRelocator, false, \ 553 "Trace the bytecode relocator") \ 554 \ 555 develop(bool, TraceLongCompiles, false, \ 556 "Print out every time compilation is longer than " \ 557 "a given threashold") \ 558 \ 559 develop(bool, SafepointALot, false, \ 560 "Generates a lot of safepoints. Works with " \ 561 "GuaranteedSafepointInterval") \ 562 \ 563 product_pd(bool, BackgroundCompilation, \ 564 "A thread requesting compilation is not blocked during " \ 565 "compilation") \ 566 \ 567 product(bool, PrintVMQWaitTime, false, \ 568 "Prints out the waiting time in VM operation queue") \ 569 \ 570 develop(bool, BailoutToInterpreterForThrows, false, \ 571 "Compiled methods which throws/catches exceptions will be " \ 572 "deopt and intp.") \ 573 \ 574 develop(bool, NoYieldsInMicrolock, false, \ 575 "Disable yields in microlock") \ 576 \ 577 develop(bool, TraceOopMapGeneration, false, \ 578 "Shows oopmap generation") \ 579 \ 580 product(bool, MethodFlushing, true, \ 581 "Reclamation of zombie and not-entrant methods") \ 582 \ 583 develop(bool, VerifyStack, false, \ 584 "Verify stack of each thread when it is entering a runtime call") \ 585 \ 586 diagnostic(bool, ForceUnreachable, false, \ 587 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 588 \ 589 notproduct(bool, StressDerivedPointers, false, \ 590 "Force scavenge when a derived pointers is detected on stack " \ 591 "after rtm call") \ 592 \ 593 develop(bool, TraceDerivedPointers, false, \ 594 "Trace traversal of derived pointers on stack") \ 595 \ 596 notproduct(bool, TraceCodeBlobStacks, false, \ 597 "Trace stack-walk of codeblobs") \ 598 \ 599 product(bool, PrintJNIResolving, false, \ 600 "Used to implement -v:jni") \ 601 \ 602 notproduct(bool, PrintRewrites, false, \ 603 "Print methods that are being rewritten") \ 604 \ 605 product(bool, UseInlineCaches, true, \ 606 "Use Inline Caches for virtual calls ") \ 607 \ 608 develop(bool, InlineArrayCopy, true, \ 609 "inline arraycopy native that is known to be part of " \ 610 "base library DLL") \ 611 \ 612 develop(bool, InlineObjectHash, true, \ 613 "inline Object::hashCode() native that is known to be part " \ 614 "of base library DLL") \ 615 \ 616 develop(bool, InlineObjectCopy, true, \ 617 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 618 \ 619 develop(bool, InlineNatives, true, \ 620 "inline natives that are known to be part of base library DLL") \ 621 \ 622 develop(bool, InlineMathNatives, true, \ 623 "inline SinD, CosD, etc.") \ 624 \ 625 develop(bool, InlineClassNatives, true, \ 626 "inline Class.isInstance, etc") \ 627 \ 628 develop(bool, InlineAtomicLong, true, \ 629 "inline sun.misc.AtomicLong") \ 630 \ 631 develop(bool, InlineThreadNatives, true, \ 632 "inline Thread.currentThread, etc") \ 633 \ 634 develop(bool, InlineReflectionGetCallerClass, true, \ 635 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 636 "of base library DLL") \ 637 \ 638 develop(bool, InlineUnsafeOps, true, \ 639 "inline memory ops (native methods) from sun.misc.Unsafe") \ 640 \ 641 develop(bool, ConvertCmpD2CmpF, true, \ 642 "Convert cmpD to cmpF when one input is constant in float range") \ 643 \ 644 develop(bool, ConvertFloat2IntClipping, true, \ 645 "Convert float2int clipping idiom to integer clipping") \ 646 \ 647 develop(bool, SpecialStringCompareTo, true, \ 648 "special version of string compareTo") \ 649 \ 650 develop(bool, SpecialStringIndexOf, true, \ 651 "special version of string indexOf") \ 652 \ 653 develop(bool, SpecialStringEquals, true, \ 654 "special version of string equals") \ 655 \ 656 develop(bool, SpecialArraysEquals, true, \ 657 "special version of Arrays.equals(char[],char[])") \ 658 \ 659 product(bool, UseSSE42Intrinsics, false, \ 660 "SSE4.2 versions of intrinsics") \ 661 \ 662 product(bool, UseCondCardMark, false, \ 663 "Check for already marked card before updating card table") \ 664 \ 665 develop(bool, TraceCallFixup, false, \ 666 "traces all call fixups") \ 667 \ 668 develop(bool, DeoptimizeALot, false, \ 669 "deoptimize at every exit from the runtime system") \ 670 \ 671 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 672 "a comma separated list of bcis to deoptimize at") \ 673 \ 674 product(bool, DeoptimizeRandom, false, \ 675 "deoptimize random frames on random exit from the runtime system")\ 676 \ 677 notproduct(bool, ZombieALot, false, \ 678 "creates zombies (non-entrant) at exit from the runt. system") \ 679 \ 680 product(bool, UnlinkSymbolsALot, false, \ 681 "unlink unreferenced symbols from the symbol table at safepoints")\ 682 \ 683 notproduct(bool, WalkStackALot, false, \ 684 "trace stack (no print) at every exit from the runtime system") \ 685 \ 686 product(bool, Debugging, false, \ 687 "set when executing debug methods in debug.ccp " \ 688 "(to prevent triggering assertions)") \ 689 \ 690 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 691 "Enable strict checks that safepoints cannot happen for threads " \ 692 "that used No_Safepoint_Verifier") \ 693 \ 694 notproduct(bool, VerifyLastFrame, false, \ 695 "Verify oops on last frame on entry to VM") \ 696 \ 697 develop(bool, TraceHandleAllocation, false, \ 698 "Prints out warnings when suspicious many handles are allocated") \ 699 \ 700 product(bool, UseCompilerSafepoints, true, \ 701 "Stop at safepoints in compiled code") \ 702 \ 703 product(bool, UseSplitVerifier, true, \ 704 "use split verifier with StackMapTable attributes") \ 705 \ 706 product(bool, FailOverToOldVerifier, true, \ 707 "fail over to old verifier when split verifier fails") \ 708 \ 709 develop(bool, ShowSafepointMsgs, false, \ 710 "Show msg. about safepoint synch.") \ 711 \ 712 product(bool, SafepointTimeout, false, \ 713 "Time out and warn or fail after SafepointTimeoutDelay " \ 714 "milliseconds if failed to reach safepoint") \ 715 \ 716 develop(bool, DieOnSafepointTimeout, false, \ 717 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 718 \ 719 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 720 /* typically, at most a few retries are needed */ \ 721 product(intx, SuspendRetryCount, 50, \ 722 "Maximum retry count for an external suspend request") \ 723 \ 724 product(intx, SuspendRetryDelay, 5, \ 725 "Milliseconds to delay per retry (* current_retry_count)") \ 726 \ 727 product(bool, AssertOnSuspendWaitFailure, false, \ 728 "Assert/Guarantee on external suspend wait failure") \ 729 \ 730 product(bool, TraceSuspendWaitFailures, false, \ 731 "Trace external suspend wait failures") \ 732 \ 733 product(bool, MaxFDLimit, true, \ 734 "Bump the number of file descriptors to max in solaris.") \ 735 \ 736 notproduct(bool, LogEvents, trueInDebug, \ 737 "Enable Event log") \ 738 \ 739 product(bool, BytecodeVerificationRemote, true, \ 740 "Enables the Java bytecode verifier for remote classes") \ 741 \ 742 product(bool, BytecodeVerificationLocal, false, \ 743 "Enables the Java bytecode verifier for local classes") \ 744 \ 745 develop(bool, ForceFloatExceptions, trueInDebug, \ 746 "Force exceptions on FP stack under/overflow") \ 747 \ 748 develop(bool, SoftMatchFailure, trueInProduct, \ 749 "If the DFA fails to match a node, print a message and bail out") \ 750 \ 751 develop(bool, VerifyStackAtCalls, false, \ 752 "Verify that the stack pointer is unchanged after calls") \ 753 \ 754 develop(bool, TraceJavaAssertions, false, \ 755 "Trace java language assertions") \ 756 \ 757 notproduct(bool, CheckAssertionStatusDirectives, false, \ 758 "temporary - see javaClasses.cpp") \ 759 \ 760 notproduct(bool, PrintMallocFree, false, \ 761 "Trace calls to C heap malloc/free allocation") \ 762 \ 763 product(bool, PrintOopAddress, false, \ 764 "Always print the location of the oop") \ 765 \ 766 notproduct(bool, VerifyCodeCacheOften, false, \ 767 "Verify compiled-code cache often") \ 768 \ 769 develop(bool, ZapDeadCompiledLocals, false, \ 770 "Zap dead locals in compiler frames") \ 771 \ 772 notproduct(bool, ZapDeadLocalsOld, false, \ 773 "Zap dead locals (old version, zaps all frames when " \ 774 "entering the VM") \ 775 \ 776 notproduct(bool, CheckOopishValues, false, \ 777 "Warn if value contains oop ( requires ZapDeadLocals)") \ 778 \ 779 develop(bool, UseMallocOnly, false, \ 780 "use only malloc/free for allocation (no resource area/arena)") \ 781 \ 782 develop(bool, PrintMalloc, false, \ 783 "print all malloc/free calls") \ 784 \ 785 develop(bool, PrintMallocStatistics, false, \ 786 "print malloc/free statistics") \ 787 \ 788 develop(bool, ZapResourceArea, trueInDebug, \ 789 "Zap freed resource/arena space with 0xABABABAB") \ 790 \ 791 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 792 "Zap freed VM handle space with 0xBCBCBCBC") \ 793 \ 794 develop(bool, ZapJNIHandleArea, trueInDebug, \ 795 "Zap freed JNI handle space with 0xFEFEFEFE") \ 796 \ 797 notproduct(bool, ZapStackSegments, trueInDebug, \ 798 "Zap allocated/freed Stack segments with 0xFADFADED") \ 799 \ 800 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 801 "Zap unused heap space with 0xBAADBABE") \ 802 \ 803 develop(bool, TraceZapUnusedHeapArea, false, \ 804 "Trace zapping of unused heap space") \ 805 \ 806 develop(bool, CheckZapUnusedHeapArea, false, \ 807 "Check zapping of unused heap space") \ 808 \ 809 develop(bool, ZapFillerObjects, trueInDebug, \ 810 "Zap filler objects with 0xDEAFBABE") \ 811 \ 812 develop(bool, PrintVMMessages, true, \ 813 "Print vm messages on console") \ 814 \ 815 product(bool, PrintGCApplicationConcurrentTime, false, \ 816 "Print the time the application has been running") \ 817 \ 818 product(bool, PrintGCApplicationStoppedTime, false, \ 819 "Print the time the application has been stopped") \ 820 \ 821 notproduct(uintx, ErrorHandlerTest, 0, \ 822 "If > 0, provokes an error after VM initialization; the value" \ 823 "determines which error to provoke. See test_error_handler()" \ 824 "in debug.cpp.") \ 825 \ 826 develop(bool, Verbose, false, \ 827 "Prints additional debugging information from other modes") \ 828 \ 829 develop(bool, PrintMiscellaneous, false, \ 830 "Prints uncategorized debugging information (requires +Verbose)") \ 831 \ 832 develop(bool, WizardMode, false, \ 833 "Prints much more debugging information") \ 834 \ 835 product(bool, ShowMessageBoxOnError, false, \ 836 "Keep process alive on VM fatal error") \ 837 \ 838 product(bool, CreateMinidumpOnCrash, false, \ 839 "Create minidump on VM fatal error") \ 840 \ 841 product_pd(bool, UseOSErrorReporting, \ 842 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 843 \ 844 product(bool, SuppressFatalErrorMessage, false, \ 845 "Do NO Fatal Error report [Avoid deadlock]") \ 846 \ 847 product(ccstrlist, OnError, "", \ 848 "Run user-defined commands on fatal error; see VMError.cpp " \ 849 "for examples") \ 850 \ 851 product(ccstrlist, OnOutOfMemoryError, "", \ 852 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 853 \ 854 manageable(bool, HeapDumpBeforeFullGC, false, \ 855 "Dump heap to file before any major stop-world GC") \ 856 \ 857 manageable(bool, HeapDumpAfterFullGC, false, \ 858 "Dump heap to file after any major stop-world GC") \ 859 \ 860 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 861 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 862 \ 863 manageable(ccstr, HeapDumpPath, NULL, \ 864 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 865 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 866 "in the working directory)") \ 867 \ 868 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 869 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 870 "when the heap usage is larger than this") \ 871 \ 872 develop(uintx, HeapDumpSegmentSize, 1*G, \ 873 "Approximate segment size when generating a segmented heap dump") \ 874 \ 875 develop(bool, BreakAtWarning, false, \ 876 "Execute breakpoint upon encountering VM warning") \ 877 \ 878 product_pd(bool, UseVectoredExceptions, \ 879 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 880 \ 881 develop(bool, TraceVMOperation, false, \ 882 "Trace vm operations") \ 883 \ 884 develop(bool, UseFakeTimers, false, \ 885 "Tells whether the VM should use system time or a fake timer") \ 886 \ 887 diagnostic(bool, LogCompilation, false, \ 888 "Log compilation activity in detail to hotspot.log or LogFile") \ 889 \ 890 product(bool, PrintCompilation, false, \ 891 "Print compilations") \ 892 \ 893 diagnostic(bool, TraceNMethodInstalls, false, \ 894 "Trace nmethod intallation") \ 895 \ 896 diagnostic(intx, ScavengeRootsInCode, 2, \ 897 "0: do not allow scavengable oops in the code cache; " \ 898 "1: allow scavenging from the code cache; " \ 899 "2: emit as many constants as the compiler can see") \ 900 \ 901 diagnostic(bool, TraceOSRBreakpoint, false, \ 902 "Trace OSR Breakpoint ") \ 903 \ 904 diagnostic(bool, TraceCompileTriggered, false, \ 905 "Trace compile triggered") \ 906 \ 907 diagnostic(bool, TraceTriggers, false, \ 908 "Trace triggers") \ 909 \ 910 product(bool, AlwaysRestoreFPU, false, \ 911 "Restore the FPU control word after every JNI call (expensive)") \ 912 \ 913 diagnostic(bool, PrintCompilation2, false, \ 914 "Print additional statistics per compilation") \ 915 \ 916 diagnostic(bool, PrintAdapterHandlers, false, \ 917 "Print code generated for i2c/c2i adapters") \ 918 \ 919 develop(bool, VerifyAdapterSharing, false, \ 920 "Verify that the code for shared adapters is the equivalent") \ 921 \ 922 diagnostic(bool, PrintAssembly, false, \ 923 "Print assembly code (using external disassembler.so)") \ 924 \ 925 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 926 "Options string passed to disassembler.so") \ 927 \ 928 diagnostic(bool, PrintNMethods, false, \ 929 "Print assembly code for nmethods when generated") \ 930 \ 931 diagnostic(bool, PrintNativeNMethods, false, \ 932 "Print assembly code for native nmethods when generated") \ 933 \ 934 develop(bool, PrintDebugInfo, false, \ 935 "Print debug information for all nmethods when generated") \ 936 \ 937 develop(bool, PrintRelocations, false, \ 938 "Print relocation information for all nmethods when generated") \ 939 \ 940 develop(bool, PrintDependencies, false, \ 941 "Print dependency information for all nmethods when generated") \ 942 \ 943 develop(bool, PrintExceptionHandlers, false, \ 944 "Print exception handler tables for all nmethods when generated") \ 945 \ 946 develop(bool, InterceptOSException, false, \ 947 "Starts debugger when an implicit OS (e.g., NULL) " \ 948 "exception happens") \ 949 \ 950 notproduct(bool, PrintCodeCache, false, \ 951 "Print the compiled_code cache when exiting") \ 952 \ 953 develop(bool, PrintCodeCache2, false, \ 954 "Print detailed info on the compiled_code cache when exiting") \ 955 \ 956 diagnostic(bool, PrintStubCode, false, \ 957 "Print generated stub code") \ 958 \ 959 product(bool, StackTraceInThrowable, true, \ 960 "Collect backtrace in throwable when exception happens") \ 961 \ 962 product(bool, OmitStackTraceInFastThrow, true, \ 963 "Omit backtraces for some 'hot' exceptions in optimized code") \ 964 \ 965 product(bool, ProfilerPrintByteCodeStatistics, false, \ 966 "Prints byte code statictics when dumping profiler output") \ 967 \ 968 product(bool, ProfilerRecordPC, false, \ 969 "Collects tick for each 16 byte interval of compiled code") \ 970 \ 971 product(bool, ProfileVM, false, \ 972 "Profiles ticks that fall within VM (either in the VM Thread " \ 973 "or VM code called through stubs)") \ 974 \ 975 product(bool, ProfileIntervals, false, \ 976 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 977 \ 978 notproduct(bool, ProfilerCheckIntervals, false, \ 979 "Collect and print info on spacing of profiler ticks") \ 980 \ 981 develop(bool, PrintJVMWarnings, false, \ 982 "Prints warnings for unimplemented JVM functions") \ 983 \ 984 product(bool, PrintWarnings, true, \ 985 "Prints JVM warnings to output stream") \ 986 \ 987 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 988 "Prints warnings for stalled SpinLocks") \ 989 \ 990 develop(bool, InitializeJavaLangSystem, true, \ 991 "Initialize java.lang.System - turn off for individual " \ 992 "method debugging") \ 993 \ 994 develop(bool, InitializeJavaLangString, true, \ 995 "Initialize java.lang.String - turn off for individual " \ 996 "method debugging") \ 997 \ 998 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 999 "Initialize various error and exception classes - turn off for " \ 1000 "individual method debugging") \ 1001 \ 1002 product(bool, RegisterFinalizersAtInit, true, \ 1003 "Register finalizable objects at end of Object.<init> or " \ 1004 "after allocation") \ 1005 \ 1006 develop(bool, RegisterReferences, true, \ 1007 "Tells whether the VM should register soft/weak/final/phantom " \ 1008 "references") \ 1009 \ 1010 develop(bool, IgnoreRewrites, false, \ 1011 "Supress rewrites of bytecodes in the oopmap generator. " \ 1012 "This is unsafe!") \ 1013 \ 1014 develop(bool, PrintCodeCacheExtension, false, \ 1015 "Print extension of code cache") \ 1016 \ 1017 develop(bool, UsePrivilegedStack, true, \ 1018 "Enable the security JVM functions") \ 1019 \ 1020 develop(bool, IEEEPrecision, true, \ 1021 "Enables IEEE precision (for INTEL only)") \ 1022 \ 1023 develop(bool, ProtectionDomainVerification, true, \ 1024 "Verifies protection domain before resolution in system " \ 1025 "dictionary") \ 1026 \ 1027 product(bool, ClassUnloading, true, \ 1028 "Do unloading of classes") \ 1029 \ 1030 diagnostic(bool, LinkWellKnownClasses, false, \ 1031 "Resolve a well known class as soon as its name is seen") \ 1032 \ 1033 develop(bool, DisableStartThread, false, \ 1034 "Disable starting of additional Java threads " \ 1035 "(for debugging only)") \ 1036 \ 1037 develop(bool, MemProfiling, false, \ 1038 "Write memory usage profiling to log file") \ 1039 \ 1040 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1041 "Prints the system dictionary at exit") \ 1042 \ 1043 diagnostic(bool, UnsyncloadClass, false, \ 1044 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1045 "class loader must call VM synchronized for findClass " \ 1046 "and defineClass.") \ 1047 \ 1048 product(bool, AlwaysLockClassLoader, false, \ 1049 "Require the VM to acquire the class loader lock before calling " \ 1050 "loadClass() even for class loaders registering " \ 1051 "as parallel capable") \ 1052 \ 1053 product(bool, AllowParallelDefineClass, false, \ 1054 "Allow parallel defineClass requests for class loaders " \ 1055 "registering as parallel capable") \ 1056 \ 1057 product(bool, MustCallLoadClassInternal, false, \ 1058 "Call loadClassInternal() rather than loadClass()") \ 1059 \ 1060 product_pd(bool, DontYieldALot, \ 1061 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1062 \ 1063 product_pd(bool, ConvertSleepToYield, \ 1064 "Converts sleep(0) to thread yield " \ 1065 "(may be off for SOLARIS to improve GUI)") \ 1066 \ 1067 product(bool, ConvertYieldToSleep, false, \ 1068 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1069 "behavior (SOLARIS only)") \ 1070 \ 1071 product(bool, UseBoundThreads, true, \ 1072 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1073 \ 1074 develop(bool, UseDetachedThreads, true, \ 1075 "Use detached threads that are recycled upon termination " \ 1076 "(for SOLARIS only)") \ 1077 \ 1078 product(bool, UseLWPSynchronization, true, \ 1079 "Use LWP-based instead of libthread-based synchronization " \ 1080 "(SPARC only)") \ 1081 \ 1082 product(ccstr, SyncKnobs, NULL, \ 1083 "(Unstable) Various monitor synchronization tunables") \ 1084 \ 1085 product(intx, EmitSync, 0, \ 1086 "(Unsafe,Unstable) " \ 1087 " Controls emission of inline sync fast-path code") \ 1088 \ 1089 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1090 \ 1091 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1092 \ 1093 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1094 \ 1095 product(intx, Atomics, 0, \ 1096 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1097 \ 1098 product(intx, FenceInstruction, 0, \ 1099 "(Unsafe,Unstable) Experimental") \ 1100 \ 1101 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1102 \ 1103 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1104 \ 1105 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1106 \ 1107 product(intx, hashCode, 0, \ 1108 "(Unstable) select hashCode generation algorithm" ) \ 1109 \ 1110 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1111 "(Unstable, Linux-specific)" \ 1112 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1113 \ 1114 product(bool, FilterSpuriousWakeups, true, \ 1115 "Prevent spurious or premature wakeups from object.wait " \ 1116 "(Solaris only)") \ 1117 \ 1118 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1119 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1120 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1121 \ 1122 develop(bool, UsePthreads, false, \ 1123 "Use pthread-based instead of libthread-based synchronization " \ 1124 "(SPARC only)") \ 1125 \ 1126 product(bool, AdjustConcurrency, false, \ 1127 "call thr_setconcurrency at thread create time to avoid " \ 1128 "LWP starvation on MP systems (For Solaris Only)") \ 1129 \ 1130 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1131 "Should the system attempt to update the compiler file when " \ 1132 "an error occurs?") \ 1133 \ 1134 product(bool, ReduceSignalUsage, false, \ 1135 "Reduce the use of OS signals in Java and/or the VM") \ 1136 \ 1137 notproduct(bool, ValidateMarkSweep, false, \ 1138 "Do extra validation during MarkSweep collection") \ 1139 \ 1140 notproduct(bool, RecordMarkSweepCompaction, false, \ 1141 "Enable GC-to-GC recording and querying of compaction during " \ 1142 "MarkSweep") \ 1143 \ 1144 develop_pd(bool, ShareVtableStubs, \ 1145 "Share vtable stubs (smaller code but worse branch prediction") \ 1146 \ 1147 develop(bool, LoadLineNumberTables, true, \ 1148 "Tells whether the class file parser loads line number tables") \ 1149 \ 1150 develop(bool, LoadLocalVariableTables, true, \ 1151 "Tells whether the class file parser loads local variable tables")\ 1152 \ 1153 develop(bool, LoadLocalVariableTypeTables, true, \ 1154 "Tells whether the class file parser loads local variable type tables")\ 1155 \ 1156 product(bool, AllowUserSignalHandlers, false, \ 1157 "Do not complain if the application installs signal handlers " \ 1158 "(Solaris & Linux only)") \ 1159 \ 1160 product(bool, UseSignalChaining, true, \ 1161 "Use signal-chaining to invoke signal handlers installed " \ 1162 "by the application (Solaris & Linux only)") \ 1163 \ 1164 product(bool, UseAltSigs, false, \ 1165 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1166 "internal signals (Solaris only)") \ 1167 \ 1168 product(bool, UseSpinning, false, \ 1169 "Use spinning in monitor inflation and before entry") \ 1170 \ 1171 product(bool, PreSpinYield, false, \ 1172 "Yield before inner spinning loop") \ 1173 \ 1174 product(bool, PostSpinYield, true, \ 1175 "Yield after inner spinning loop") \ 1176 \ 1177 product(bool, AllowJNIEnvProxy, false, \ 1178 "Allow JNIEnv proxies for jdbx") \ 1179 \ 1180 product(bool, JNIDetachReleasesMonitors, true, \ 1181 "JNI DetachCurrentThread releases monitors owned by thread") \ 1182 \ 1183 product(bool, RestoreMXCSROnJNICalls, false, \ 1184 "Restore MXCSR when returning from JNI calls") \ 1185 \ 1186 product(bool, CheckJNICalls, false, \ 1187 "Verify all arguments to JNI calls") \ 1188 \ 1189 product(bool, UseFastJNIAccessors, true, \ 1190 "Use optimized versions of Get<Primitive>Field") \ 1191 \ 1192 product(bool, EagerXrunInit, false, \ 1193 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1194 " but not all -Xrun libraries may support the state of the VM at this time") \ 1195 \ 1196 product(bool, PreserveAllAnnotations, false, \ 1197 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1198 \ 1199 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1200 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1201 \ 1202 product(bool, LazyBootClassLoader, true, \ 1203 "Enable/disable lazy opening of boot class path entries") \ 1204 \ 1205 diagnostic(bool, UseIncDec, true, \ 1206 "Use INC, DEC instructions on x86") \ 1207 \ 1208 product(bool, UseNewLongLShift, false, \ 1209 "Use optimized bitwise shift left") \ 1210 \ 1211 product(bool, UseStoreImmI16, true, \ 1212 "Use store immediate 16-bits value instruction on x86") \ 1213 \ 1214 product(bool, UseAddressNop, false, \ 1215 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1216 \ 1217 product(bool, UseXmmLoadAndClearUpper, true, \ 1218 "Load low part of XMM register and clear upper part") \ 1219 \ 1220 product(bool, UseXmmRegToRegMoveAll, false, \ 1221 "Copy all XMM register bits when moving value between registers") \ 1222 \ 1223 product(bool, UseXmmI2D, false, \ 1224 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1225 \ 1226 product(bool, UseXmmI2F, false, \ 1227 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1228 \ 1229 product(bool, UseXMMForArrayCopy, false, \ 1230 "Use SSE2 MOVQ instruction for Arraycopy") \ 1231 \ 1232 product(bool, UseUnalignedLoadStores, false, \ 1233 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1234 \ 1235 product(bool, UseCBCond, false, \ 1236 "Use compare and branch instruction on SPARC") \ 1237 \ 1238 product(intx, FieldsAllocationStyle, 1, \ 1239 "0 - type based with oops first, 1 - with oops last, " \ 1240 "2 - oops in super and sub classes are together") \ 1241 \ 1242 product(bool, CompactFields, true, \ 1243 "Allocate nonstatic fields in gaps between previous fields") \ 1244 \ 1245 notproduct(bool, PrintCompactFieldsSavings, false, \ 1246 "Print how many words were saved with CompactFields") \ 1247 \ 1248 product(bool, UseBiasedLocking, true, \ 1249 "Enable biased locking in JVM") \ 1250 \ 1251 product(intx, BiasedLockingStartupDelay, 4000, \ 1252 "Number of milliseconds to wait before enabling biased locking") \ 1253 \ 1254 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1255 "Print statistics of biased locking in JVM") \ 1256 \ 1257 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1258 "Threshold of number of revocations per type to try to " \ 1259 "rebias all objects in the heap of that type") \ 1260 \ 1261 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1262 "Threshold of number of revocations per type to permanently " \ 1263 "revoke biases of all objects in the heap of that type") \ 1264 \ 1265 product(intx, BiasedLockingDecayTime, 25000, \ 1266 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1267 "type after previous bulk rebias") \ 1268 \ 1269 develop(bool, JavaObjectsInPerm, false, \ 1270 "controls whether Classes and interned Strings are allocated" \ 1271 "in perm. This purely intended to allow debugging issues" \ 1272 "in production.") \ 1273 \ 1274 /* tracing */ \ 1275 \ 1276 notproduct(bool, TraceRuntimeCalls, false, \ 1277 "Trace run-time calls") \ 1278 \ 1279 develop(bool, TraceJNICalls, false, \ 1280 "Trace JNI calls") \ 1281 \ 1282 notproduct(bool, TraceJVMCalls, false, \ 1283 "Trace JVM calls") \ 1284 \ 1285 product(ccstr, TraceJVMTI, NULL, \ 1286 "Trace flags for JVMTI functions and events") \ 1287 \ 1288 /* This option can change an EMCP method into an obsolete method. */ \ 1289 /* This can affect tests that except specific methods to be EMCP. */ \ 1290 /* This option should be used with caution. */ \ 1291 product(bool, StressLdcRewrite, false, \ 1292 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1293 \ 1294 product(intx, TraceRedefineClasses, 0, \ 1295 "Trace level for JVMTI RedefineClasses") \ 1296 \ 1297 develop(bool, StressMethodComparator, false, \ 1298 "run the MethodComparator on all loaded methods") \ 1299 \ 1300 /* change to false by default sometime after Mustang */ \ 1301 product(bool, VerifyMergedCPBytecodes, true, \ 1302 "Verify bytecodes after RedefineClasses constant pool merging") \ 1303 \ 1304 develop(bool, TraceJNIHandleAllocation, false, \ 1305 "Trace allocation/deallocation of JNI handle blocks") \ 1306 \ 1307 develop(bool, TraceThreadEvents, false, \ 1308 "Trace all thread events") \ 1309 \ 1310 develop(bool, TraceBytecodes, false, \ 1311 "Trace bytecode execution") \ 1312 \ 1313 develop(bool, TraceClassInitialization, false, \ 1314 "Trace class initialization") \ 1315 \ 1316 develop(bool, TraceExceptions, false, \ 1317 "Trace exceptions") \ 1318 \ 1319 develop(bool, TraceICs, false, \ 1320 "Trace inline cache changes") \ 1321 \ 1322 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1323 "Trace method invocation counter overflow") \ 1324 \ 1325 develop(bool, TraceInlineCacheClearing, false, \ 1326 "Trace clearing of inline caches in nmethods") \ 1327 \ 1328 develop(bool, TraceDependencies, false, \ 1329 "Trace dependencies") \ 1330 \ 1331 develop(bool, VerifyDependencies, trueInDebug, \ 1332 "Exercise and verify the compilation dependency mechanism") \ 1333 \ 1334 develop(bool, TraceNewOopMapGeneration, false, \ 1335 "Trace OopMapGeneration") \ 1336 \ 1337 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1338 "Trace OopMapGeneration: print detailed cell states") \ 1339 \ 1340 develop(bool, TimeOopMap, false, \ 1341 "Time calls to GenerateOopMap::compute_map() in sum") \ 1342 \ 1343 develop(bool, TimeOopMap2, false, \ 1344 "Time calls to GenerateOopMap::compute_map() individually") \ 1345 \ 1346 develop(bool, TraceMonitorMismatch, false, \ 1347 "Trace monitor matching failures during OopMapGeneration") \ 1348 \ 1349 develop(bool, TraceOopMapRewrites, false, \ 1350 "Trace rewritting of method oops during oop map generation") \ 1351 \ 1352 develop(bool, TraceSafepoint, false, \ 1353 "Trace safepoint operations") \ 1354 \ 1355 develop(bool, TraceICBuffer, false, \ 1356 "Trace usage of IC buffer") \ 1357 \ 1358 develop(bool, TraceCompiledIC, false, \ 1359 "Trace changes of compiled IC") \ 1360 \ 1361 notproduct(bool, TraceZapDeadLocals, false, \ 1362 "Trace zapping dead locals") \ 1363 \ 1364 develop(bool, TraceStartupTime, false, \ 1365 "Trace setup time") \ 1366 \ 1367 product(ccstr, HPILibPath, NULL, \ 1368 "Specify alternate path to HPI library") \ 1369 \ 1370 develop(bool, TraceProtectionDomainVerification, false, \ 1371 "Trace protection domain verifcation") \ 1372 \ 1373 develop(bool, TraceClearedExceptions, false, \ 1374 "Prints when an exception is forcibly cleared") \ 1375 \ 1376 product(bool, TraceClassResolution, false, \ 1377 "Trace all constant pool resolutions (for debugging)") \ 1378 \ 1379 product(bool, TraceBiasedLocking, false, \ 1380 "Trace biased locking in JVM") \ 1381 \ 1382 product(bool, TraceMonitorInflation, false, \ 1383 "Trace monitor inflation in JVM") \ 1384 \ 1385 /* assembler */ \ 1386 product(bool, Use486InstrsOnly, false, \ 1387 "Use 80486 Compliant instruction subset") \ 1388 \ 1389 /* gc */ \ 1390 \ 1391 product(bool, UseSerialGC, false, \ 1392 "Use the serial garbage collector") \ 1393 \ 1394 product(bool, UseG1GC, false, \ 1395 "Use the Garbage-First garbage collector") \ 1396 \ 1397 product(bool, UseParallelGC, false, \ 1398 "Use the Parallel Scavenge garbage collector") \ 1399 \ 1400 product(bool, UseParallelOldGC, false, \ 1401 "Use the Parallel Old garbage collector") \ 1402 \ 1403 product(uintx, HeapMaximumCompactionInterval, 20, \ 1404 "How often should we maximally compact the heap (not allowing " \ 1405 "any dead space)") \ 1406 \ 1407 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1408 "The collection count for the first maximum compaction") \ 1409 \ 1410 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1411 "In the Parallel Old garbage collector maximum compaction for " \ 1412 "a system GC") \ 1413 \ 1414 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1415 "The mean used by the par compact dead wood" \ 1416 "limiter (a number between 0-100).") \ 1417 \ 1418 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1419 "The standard deviation used by the par compact dead wood" \ 1420 "limiter (a number between 0-100).") \ 1421 \ 1422 product(uintx, ParallelGCThreads, 0, \ 1423 "Number of parallel threads parallel gc will use") \ 1424 \ 1425 product(bool, UseDynamicNumberOfGCThreads, false, \ 1426 "Dynamically choose the number of parallel threads " \ 1427 "parallel gc will use") \ 1428 \ 1429 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1430 "Force dynamic selection of the number of" \ 1431 "parallel threads parallel gc will use to aid debugging") \ 1432 \ 1433 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1434 "Size of heap (bytes) per GC thread used in calculating the " \ 1435 "number of GC threads") \ 1436 \ 1437 product(bool, TraceDynamicGCThreads, false, \ 1438 "Trace the dynamic GC thread usage") \ 1439 \ 1440 develop(bool, ParallelOldGCSplitALot, false, \ 1441 "Provoke splitting (copying data from a young gen space to" \ 1442 "multiple destination spaces)") \ 1443 \ 1444 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1445 "How often to provoke splitting a young gen space") \ 1446 \ 1447 develop(bool, TraceRegionTasksQueuing, false, \ 1448 "Trace the queuing of the region tasks") \ 1449 \ 1450 product(uintx, ConcGCThreads, 0, \ 1451 "Number of threads concurrent gc will use") \ 1452 \ 1453 product(uintx, YoungPLABSize, 4096, \ 1454 "Size of young gen promotion labs (in HeapWords)") \ 1455 \ 1456 product(uintx, OldPLABSize, 1024, \ 1457 "Size of old gen promotion labs (in HeapWords)") \ 1458 \ 1459 product(uintx, GCTaskTimeStampEntries, 200, \ 1460 "Number of time stamp entries per gc worker thread") \ 1461 \ 1462 product(bool, AlwaysTenure, false, \ 1463 "Always tenure objects in eden. (ParallelGC only)") \ 1464 \ 1465 product(bool, NeverTenure, false, \ 1466 "Never tenure objects in eden, May tenure on overflow " \ 1467 "(ParallelGC only)") \ 1468 \ 1469 product(bool, ScavengeBeforeFullGC, true, \ 1470 "Scavenge youngest generation before each full GC, " \ 1471 "used with UseParallelGC") \ 1472 \ 1473 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1474 "Allow scavenges to occur when to_space contains objects.") \ 1475 \ 1476 product(bool, UseConcMarkSweepGC, false, \ 1477 "Use Concurrent Mark-Sweep GC in the old generation") \ 1478 \ 1479 product(bool, ExplicitGCInvokesConcurrent, false, \ 1480 "A System.gc() request invokes a concurrent collection;" \ 1481 " (effective only when UseConcMarkSweepGC)") \ 1482 \ 1483 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1484 "A System.gc() request invokes a concurrent collection and " \ 1485 "also unloads classes during such a concurrent gc cycle " \ 1486 "(effective only when UseConcMarkSweepGC)") \ 1487 \ 1488 product(bool, GCLockerInvokesConcurrent, false, \ 1489 "The exit of a JNI CS necessitating a scavenge also" \ 1490 " kicks off a bkgrd concurrent collection") \ 1491 \ 1492 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1493 "How much the GC can expand the eden by while the GC locker " \ 1494 "is active (as a percentage)") \ 1495 \ 1496 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1497 "Use Adaptive Free Lists in the CMS generation") \ 1498 \ 1499 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1500 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1501 \ 1502 develop(bool, RotateCMSCollectionTypes, false, \ 1503 "Rotate the CMS collections among concurrent and STW") \ 1504 \ 1505 product(bool, UseCMSBestFit, true, \ 1506 "Use CMS best fit allocation strategy") \ 1507 \ 1508 product(bool, UseCMSCollectionPassing, true, \ 1509 "Use passing of collection from background to foreground") \ 1510 \ 1511 product(bool, UseParNewGC, false, \ 1512 "Use parallel threads in the new generation.") \ 1513 \ 1514 product(bool, ParallelGCVerbose, false, \ 1515 "Verbose output for parallel GC.") \ 1516 \ 1517 product(intx, ParallelGCBufferWastePct, 10, \ 1518 "wasted fraction of parallel allocation buffer.") \ 1519 \ 1520 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1521 "Retain parallel allocation buffers across scavenges; " \ 1522 " -- disabled because this currently conflicts with " \ 1523 " parallel card scanning under certain conditions ") \ 1524 \ 1525 product(intx, TargetPLABWastePct, 10, \ 1526 "target wasted space in last buffer as pct of overall allocation")\ 1527 \ 1528 product(uintx, PLABWeight, 75, \ 1529 "Percentage (0-100) used to weight the current sample when" \ 1530 "computing exponentially decaying average for ResizePLAB.") \ 1531 \ 1532 product(bool, ResizePLAB, true, \ 1533 "Dynamically resize (survivor space) promotion labs") \ 1534 \ 1535 product(bool, PrintPLAB, false, \ 1536 "Print (survivor space) promotion labs sizing decisions") \ 1537 \ 1538 product(intx, ParGCArrayScanChunk, 50, \ 1539 "Scan a subset and push remainder, if array is bigger than this") \ 1540 \ 1541 product(bool, ParGCUseLocalOverflow, false, \ 1542 "Instead of a global overflow list, use local overflow stacks") \ 1543 \ 1544 product(bool, ParGCTrimOverflow, true, \ 1545 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1546 \ 1547 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1548 "Whether we should simulate work queue overflow in ParNew") \ 1549 \ 1550 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1551 "An `interval' counter that determines how frequently " \ 1552 "we simulate overflow; a smaller number increases frequency") \ 1553 \ 1554 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1555 "The desired number of objects to claim from the overflow list") \ 1556 \ 1557 diagnostic(intx, ParGCStridesPerThread, 2, \ 1558 "The number of strides per worker thread that we divide up the " \ 1559 "card table scanning work into") \ 1560 \ 1561 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1562 "The number of cards in each chunk of the parallel chunks used " \ 1563 "during card table scanning") \ 1564 \ 1565 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1566 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1567 "parallel GC.") \ 1568 \ 1569 product(uintx, OldPLABWeight, 50, \ 1570 "Percentage (0-100) used to weight the current sample when" \ 1571 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1572 \ 1573 product(bool, ResizeOldPLAB, true, \ 1574 "Dynamically resize (old gen) promotion labs") \ 1575 \ 1576 product(bool, PrintOldPLAB, false, \ 1577 "Print (old gen) promotion labs sizing decisions") \ 1578 \ 1579 product(uintx, CMSOldPLABMin, 16, \ 1580 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1581 \ 1582 product(uintx, CMSOldPLABMax, 1024, \ 1583 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1584 \ 1585 product(uintx, CMSOldPLABNumRefills, 4, \ 1586 "Nominal number of refills of CMS gen promotion lab cache" \ 1587 " per worker per block size") \ 1588 \ 1589 product(bool, CMSOldPLABResizeQuicker, false, \ 1590 "Whether to react on-the-fly during a scavenge to a sudden" \ 1591 " change in block demand rate") \ 1592 \ 1593 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1594 "The tolerance of the phase-change detector for on-the-fly" \ 1595 " PLAB resizing during a scavenge") \ 1596 \ 1597 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1598 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1599 " during a scavenge") \ 1600 \ 1601 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1602 "The clamping of the gain in the feedback loop for on-the-fly" \ 1603 " PLAB resizing during a scavenge") \ 1604 \ 1605 product(bool, AlwaysPreTouch, false, \ 1606 "It forces all freshly committed pages to be pre-touched.") \ 1607 \ 1608 product_pd(intx, CMSYoungGenPerWorker, \ 1609 "The maximum size of young gen chosen by default per GC worker " \ 1610 "thread available") \ 1611 \ 1612 product(bool, GCOverheadReporting, false, \ 1613 "Enables the GC overhead reporting facility") \ 1614 \ 1615 product(intx, GCOverheadReportingPeriodMS, 100, \ 1616 "Reporting period for conc GC overhead reporting, in ms ") \ 1617 \ 1618 product(bool, CMSIncrementalMode, false, \ 1619 "Whether CMS GC should operate in \"incremental\" mode") \ 1620 \ 1621 product(uintx, CMSIncrementalDutyCycle, 10, \ 1622 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1623 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1624 "value") \ 1625 \ 1626 product(bool, CMSIncrementalPacing, true, \ 1627 "Whether the CMS incremental mode duty cycle should be " \ 1628 "automatically adjusted") \ 1629 \ 1630 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1631 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1632 "enabled (a percentage, 0-100)") \ 1633 \ 1634 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1635 "Percentage (0-100) used to add conservatism when computing the " \ 1636 "duty cycle") \ 1637 \ 1638 product(uintx, CMSIncrementalOffset, 0, \ 1639 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1640 " is shifted to the right within the period between young GCs") \ 1641 \ 1642 product(uintx, CMSExpAvgFactor, 50, \ 1643 "Percentage (0-100) used to weight the current sample when" \ 1644 "computing exponential averages for CMS statistics.") \ 1645 \ 1646 product(uintx, CMS_FLSWeight, 75, \ 1647 "Percentage (0-100) used to weight the current sample when" \ 1648 "computing exponentially decating averages for CMS FLS statistics.") \ 1649 \ 1650 product(uintx, CMS_FLSPadding, 1, \ 1651 "The multiple of deviation from mean to use for buffering" \ 1652 "against volatility in free list demand.") \ 1653 \ 1654 product(uintx, FLSCoalescePolicy, 2, \ 1655 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1656 \ 1657 product(bool, FLSAlwaysCoalesceLarge, false, \ 1658 "CMS: Larger free blocks are always available for coalescing") \ 1659 \ 1660 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1661 "CMS: the smaller the percentage the greater the coalition force")\ 1662 \ 1663 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1664 "CMS: the factor by which to inflate estimated demand of small" \ 1665 " block sizes to prevent coalescing with an adjoining block") \ 1666 \ 1667 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1668 "CMS: the factor by which to inflate estimated demand of large" \ 1669 " block sizes to prevent coalescing with an adjoining block") \ 1670 \ 1671 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1672 "CMS: the factor by which to inflate estimated demand of small" \ 1673 " block sizes to prevent splitting to supply demand for smaller" \ 1674 " blocks") \ 1675 \ 1676 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1677 "CMS: the factor by which to inflate estimated demand of large" \ 1678 " block sizes to prevent splitting to supply demand for smaller" \ 1679 " blocks") \ 1680 \ 1681 product(bool, CMSExtrapolateSweep, false, \ 1682 "CMS: cushion for block demand during sweep") \ 1683 \ 1684 product(uintx, CMS_SweepWeight, 75, \ 1685 "Percentage (0-100) used to weight the current sample when " \ 1686 "computing exponentially decaying average for inter-sweep " \ 1687 "duration") \ 1688 \ 1689 product(uintx, CMS_SweepPadding, 1, \ 1690 "The multiple of deviation from mean to use for buffering " \ 1691 "against volatility in inter-sweep duration.") \ 1692 \ 1693 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1694 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1695 "duration exceeds this threhold in milliseconds") \ 1696 \ 1697 develop(bool, CMSTraceIncrementalMode, false, \ 1698 "Trace CMS incremental mode") \ 1699 \ 1700 develop(bool, CMSTraceIncrementalPacing, false, \ 1701 "Trace CMS incremental mode pacing computation") \ 1702 \ 1703 develop(bool, CMSTraceThreadState, false, \ 1704 "Trace the CMS thread state (enable the trace_state() method)") \ 1705 \ 1706 product(bool, CMSClassUnloadingEnabled, false, \ 1707 "Whether class unloading enabled when using CMS GC") \ 1708 \ 1709 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1710 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1711 " for which classes may not be unloaded") \ 1712 \ 1713 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1714 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1715 \ 1716 product(bool, UseCMSCompactAtFullCollection, true, \ 1717 "Use mark sweep compact at full collections") \ 1718 \ 1719 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1720 "Number of CMS full collection done before compaction if > 0") \ 1721 \ 1722 develop(intx, CMSDictionaryChoice, 0, \ 1723 "Use BinaryTreeDictionary as default in the CMS generation") \ 1724 \ 1725 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1726 "Replenish an indexed free list with this number of chunks") \ 1727 \ 1728 product(bool, CMSReplenishIntermediate, true, \ 1729 "Replenish all intermediate free-list caches") \ 1730 \ 1731 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1732 "When satisfying batched demand, split blocks from the " \ 1733 "IndexedFreeList whose size is a multiple of requested size") \ 1734 \ 1735 product(bool, CMSLoopWarn, false, \ 1736 "Warn in case of excessive CMS looping") \ 1737 \ 1738 develop(bool, CMSOverflowEarlyRestoration, false, \ 1739 "Whether preserved marks should be restored early") \ 1740 \ 1741 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1742 "Size of marking stack") \ 1743 \ 1744 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1745 "Max size of marking stack") \ 1746 \ 1747 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1748 "Whether we should simulate frequent marking stack / work queue" \ 1749 " overflow") \ 1750 \ 1751 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1752 "An `interval' counter that determines how frequently" \ 1753 " we simulate overflow; a smaller number increases frequency") \ 1754 \ 1755 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1756 "(Temporary, subject to experimentation)" \ 1757 "Maximum number of abortable preclean iterations, if > 0") \ 1758 \ 1759 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1760 "(Temporary, subject to experimentation)" \ 1761 "Maximum time in abortable preclean in ms") \ 1762 \ 1763 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1764 "(Temporary, subject to experimentation)" \ 1765 "Nominal minimum work per abortable preclean iteration") \ 1766 \ 1767 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1768 "(Temporary, subject to experimentation)" \ 1769 " Time that we sleep between iterations when not given" \ 1770 " enough work per iteration") \ 1771 \ 1772 product(uintx, CMSRescanMultiple, 32, \ 1773 "Size (in cards) of CMS parallel rescan task") \ 1774 \ 1775 product(uintx, CMSConcMarkMultiple, 32, \ 1776 "Size (in cards) of CMS concurrent MT marking task") \ 1777 \ 1778 product(uintx, CMSRevisitStackSize, 1*M, \ 1779 "Size of CMS KlassKlass revisit stack") \ 1780 \ 1781 product(bool, CMSAbortSemantics, false, \ 1782 "Whether abort-on-overflow semantics is implemented") \ 1783 \ 1784 product(bool, CMSParallelRemarkEnabled, true, \ 1785 "Whether parallel remark enabled (only if ParNewGC)") \ 1786 \ 1787 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1788 "Whether parallel remark of survivor space" \ 1789 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1790 \ 1791 product(bool, CMSPLABRecordAlways, true, \ 1792 "Whether to always record survivor space PLAB bdries" \ 1793 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1794 \ 1795 product(bool, CMSConcurrentMTEnabled, true, \ 1796 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1797 \ 1798 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1799 "Whether concurrent precleaning enabled in perm gen" \ 1800 " (effective only when CMSPrecleaningEnabled is true)") \ 1801 \ 1802 product(bool, CMSPrecleaningEnabled, true, \ 1803 "Whether concurrent precleaning enabled") \ 1804 \ 1805 product(uintx, CMSPrecleanIter, 3, \ 1806 "Maximum number of precleaning iteration passes") \ 1807 \ 1808 product(uintx, CMSPrecleanNumerator, 2, \ 1809 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1810 " ratio") \ 1811 \ 1812 product(uintx, CMSPrecleanDenominator, 3, \ 1813 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1814 " ratio") \ 1815 \ 1816 product(bool, CMSPrecleanRefLists1, true, \ 1817 "Preclean ref lists during (initial) preclean phase") \ 1818 \ 1819 product(bool, CMSPrecleanRefLists2, false, \ 1820 "Preclean ref lists during abortable preclean phase") \ 1821 \ 1822 product(bool, CMSPrecleanSurvivors1, false, \ 1823 "Preclean survivors during (initial) preclean phase") \ 1824 \ 1825 product(bool, CMSPrecleanSurvivors2, true, \ 1826 "Preclean survivors during abortable preclean phase") \ 1827 \ 1828 product(uintx, CMSPrecleanThreshold, 1000, \ 1829 "Don't re-iterate if #dirty cards less than this") \ 1830 \ 1831 product(bool, CMSCleanOnEnter, true, \ 1832 "Clean-on-enter optimization for reducing number of dirty cards") \ 1833 \ 1834 product(uintx, CMSRemarkVerifyVariant, 1, \ 1835 "Choose variant (1,2) of verification following remark") \ 1836 \ 1837 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1838 "If Eden used is below this value, don't try to schedule remark") \ 1839 \ 1840 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1841 "The Eden occupancy % at which to try and schedule remark pause") \ 1842 \ 1843 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1844 "Start sampling Eden top at least before yg occupancy reaches" \ 1845 " 1/<ratio> of the size at which we plan to schedule remark") \ 1846 \ 1847 product(uintx, CMSSamplingGrain, 16*K, \ 1848 "The minimum distance between eden samples for CMS (see above)") \ 1849 \ 1850 product(bool, CMSScavengeBeforeRemark, false, \ 1851 "Attempt scavenge before the CMS remark step") \ 1852 \ 1853 develop(bool, CMSTraceSweeper, false, \ 1854 "Trace some actions of the CMS sweeper") \ 1855 \ 1856 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1857 "Don't drain below this size per parallel worker/thief") \ 1858 \ 1859 manageable(intx, CMSWaitDuration, 2000, \ 1860 "Time in milliseconds that CMS thread waits for young GC") \ 1861 \ 1862 product(bool, CMSYield, true, \ 1863 "Yield between steps of concurrent mark & sweep") \ 1864 \ 1865 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1866 "Bitmap operations should process at most this many bits" \ 1867 "between yields") \ 1868 \ 1869 product(bool, CMSDumpAtPromotionFailure, false, \ 1870 "Dump useful information about the state of the CMS old " \ 1871 " generation upon a promotion failure.") \ 1872 \ 1873 product(bool, CMSPrintChunksInDump, false, \ 1874 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1875 " more detailed information about the free chunks.") \ 1876 \ 1877 product(bool, CMSPrintObjectsInDump, false, \ 1878 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1879 " more detailed information about the allocated objects.") \ 1880 \ 1881 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1882 "Verify that all refs across the FLS boundary " \ 1883 " are to valid objects") \ 1884 \ 1885 diagnostic(bool, FLSVerifyLists, false, \ 1886 "Do lots of (expensive) FreeListSpace verification") \ 1887 \ 1888 diagnostic(bool, FLSVerifyIndexTable, false, \ 1889 "Do lots of (expensive) FLS index table verification") \ 1890 \ 1891 develop(bool, FLSVerifyDictionary, false, \ 1892 "Do lots of (expensive) FLS dictionary verification") \ 1893 \ 1894 develop(bool, VerifyBlockOffsetArray, false, \ 1895 "Do (expensive!) block offset array verification") \ 1896 \ 1897 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1898 "Maintain _unallocated_block in BlockOffsetArray" \ 1899 " (currently applicable only to CMS collector)") \ 1900 \ 1901 develop(bool, TraceCMSState, false, \ 1902 "Trace the state of the CMS collection") \ 1903 \ 1904 product(intx, RefDiscoveryPolicy, 0, \ 1905 "Whether reference-based(0) or referent-based(1)") \ 1906 \ 1907 product(bool, ParallelRefProcEnabled, false, \ 1908 "Enable parallel reference processing whenever possible") \ 1909 \ 1910 product(bool, ParallelRefProcBalancingEnabled, true, \ 1911 "Enable balancing of reference processing queues") \ 1912 \ 1913 product(intx, CMSTriggerRatio, 80, \ 1914 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1915 "allocated before a CMS collection cycle commences") \ 1916 \ 1917 product(intx, CMSTriggerPermRatio, 80, \ 1918 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1919 "is allocated before a CMS collection cycle commences, that " \ 1920 "also collects the perm generation") \ 1921 \ 1922 product(uintx, CMSBootstrapOccupancy, 50, \ 1923 "Percentage CMS generation occupancy at which to " \ 1924 "initiate CMS collection for bootstrapping collection stats") \ 1925 \ 1926 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1927 "Percentage CMS generation occupancy to start a CMS collection " \ 1928 "cycle. A negative value means that CMSTriggerRatio is used") \ 1929 \ 1930 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1931 "Percentage of the (entire) heap occupancy to start a " \ 1932 "concurrent GC cycle. It us used by GCs that trigger a " \ 1933 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1934 "not just one of the generations (e.g., G1). A value of 0 " \ 1935 "denotes 'do constant GC cycles'.") \ 1936 \ 1937 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1938 "Percentage CMS perm generation occupancy to start a " \ 1939 "CMScollection cycle. A negative value means that " \ 1940 "CMSTriggerPermRatio is used") \ 1941 \ 1942 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1943 "Only use occupancy as a crierion for starting a CMS collection") \ 1944 \ 1945 product(intx, CMSIsTooFullPercentage, 98, \ 1946 "An absolute ceiling above which CMS will always consider the " \ 1947 "perm gen ripe for collection") \ 1948 \ 1949 develop(bool, CMSTestInFreeList, false, \ 1950 "Check if the coalesced range is already in the " \ 1951 "free lists as claimed") \ 1952 \ 1953 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1954 "Check that all the garbage collected was returned to the " \ 1955 "free lists.") \ 1956 \ 1957 notproduct(bool, ScavengeALot, false, \ 1958 "Force scavenge at every Nth exit from the runtime system " \ 1959 "(N=ScavengeALotInterval)") \ 1960 \ 1961 develop(bool, FullGCALot, false, \ 1962 "Force full gc at every Nth exit from the runtime system " \ 1963 "(N=FullGCALotInterval)") \ 1964 \ 1965 notproduct(bool, GCALotAtAllSafepoints, false, \ 1966 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1967 \ 1968 product(bool, PrintPromotionFailure, false, \ 1969 "Print additional diagnostic information following " \ 1970 " promotion failure") \ 1971 \ 1972 notproduct(bool, PromotionFailureALot, false, \ 1973 "Use promotion failure handling on every youngest generation " \ 1974 "collection") \ 1975 \ 1976 develop(uintx, PromotionFailureALotCount, 1000, \ 1977 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1978 "refill attempts (ParNew) or promotion attempts " \ 1979 "(other young collectors) ") \ 1980 \ 1981 develop(uintx, PromotionFailureALotInterval, 5, \ 1982 "Total collections between promotion failures alot") \ 1983 \ 1984 experimental(intx, WorkStealingSleepMillis, 1, \ 1985 "Sleep time when sleep is used for yields") \ 1986 \ 1987 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1988 "Number of yields before a sleep is done during workstealing") \ 1989 \ 1990 experimental(uintx, WorkStealingHardSpins, 4096, \ 1991 "Number of iterations in a spin loop between checks on " \ 1992 "time out of hard spin") \ 1993 \ 1994 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1995 "Ratio of hard spins to calls to yield") \ 1996 \ 1997 product(uintx, PreserveMarkStackSize, 1024, \ 1998 "Size for stack used in promotion failure handling") \ 1999 \ 2000 develop(uintx, ObjArrayMarkingStride, 512, \ 2001 "Number of ObjArray elements to push onto the marking stack" \ 2002 "before pushing a continuation entry") \ 2003 \ 2004 notproduct(bool, ExecuteInternalVMTests, false, \ 2005 "Enable execution of internal VM tests.") \ 2006 \ 2007 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2008 \ 2009 product_pd(bool, ResizeTLAB, \ 2010 "Dynamically resize tlab size for threads") \ 2011 \ 2012 product(bool, ZeroTLAB, false, \ 2013 "Zero out the newly created TLAB") \ 2014 \ 2015 product(bool, FastTLABRefill, true, \ 2016 "Use fast TLAB refill code") \ 2017 \ 2018 product(bool, PrintTLAB, false, \ 2019 "Print various TLAB related information") \ 2020 \ 2021 product(bool, TLABStats, true, \ 2022 "Print various TLAB related information") \ 2023 \ 2024 product(bool, UseBlockZeroing, false, \ 2025 "Use special cpu instructions for block zeroing") \ 2026 \ 2027 product(intx, BlockZeroingLowLimit, 2048, \ 2028 "Minimum size in bytes when block zeroing will be used") \ 2029 \ 2030 product(bool, UseBlockCopy, false, \ 2031 "Use special cpu instructions for block copy") \ 2032 \ 2033 product(intx, BlockCopyLowLimit, 2048, \ 2034 "Minimum size in bytes when block copy will be used") \ 2035 \ 2036 product(bool, PrintRevisitStats, false, \ 2037 "Print revisit (klass and MDO) stack related information") \ 2038 \ 2039 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2040 "Enable LowMemoryProtection")) \ 2041 \ 2042 product_pd(bool, NeverActAsServerClassMachine, \ 2043 "Never act like a server-class machine") \ 2044 \ 2045 product(bool, AlwaysActAsServerClassMachine, false, \ 2046 "Always act like a server-class machine") \ 2047 \ 2048 product_pd(uint64_t, MaxRAM, \ 2049 "Real memory size (in bytes) used to set maximum heap size") \ 2050 \ 2051 product(uintx, ErgoHeapSizeLimit, 0, \ 2052 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2053 "MaxRAM / MaxRAMFraction") \ 2054 \ 2055 product(uintx, MaxRAMFraction, 4, \ 2056 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2057 "size") \ 2058 \ 2059 product(uintx, DefaultMaxRAMFraction, 4, \ 2060 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2061 "size; deprecated: to be renamed to MaxRAMFraction") \ 2062 \ 2063 product(uintx, MinRAMFraction, 2, \ 2064 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2065 "size on systems with small physical memory size") \ 2066 \ 2067 product(uintx, InitialRAMFraction, 64, \ 2068 "Fraction (1/n) of real memory used for initial heap size") \ 2069 \ 2070 product(bool, UseAutoGCSelectPolicy, false, \ 2071 "Use automatic collection selection policy") \ 2072 \ 2073 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2074 "Automatic GC selection pause threshhold in ms") \ 2075 \ 2076 product(bool, UseAdaptiveSizePolicy, true, \ 2077 "Use adaptive generation sizing policies") \ 2078 \ 2079 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2080 "Use adaptive survivor sizing policies") \ 2081 \ 2082 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2083 "Use adaptive young-old sizing policies at minor collections") \ 2084 \ 2085 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2086 "Use adaptive young-old sizing policies at major collections") \ 2087 \ 2088 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2089 "Use statistics from System.GC for adaptive size policy") \ 2090 \ 2091 product(bool, UseAdaptiveGCBoundary, false, \ 2092 "Allow young-old boundary to move") \ 2093 \ 2094 develop(bool, TraceAdaptiveGCBoundary, false, \ 2095 "Trace young-old boundary moves") \ 2096 \ 2097 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2098 "Resize the virtual spaces of the young or old generations") \ 2099 \ 2100 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2101 "Policy for changeing generation size for throughput goals") \ 2102 \ 2103 product(uintx, AdaptiveSizePausePolicy, 0, \ 2104 "Policy for changing generation size for pause goals") \ 2105 \ 2106 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2107 "Adjust tenured generation to achive a minor pause goal") \ 2108 \ 2109 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2110 "Adjust young generation to achive a major pause goal") \ 2111 \ 2112 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2113 "Number of steps where heuristics is used before data is used") \ 2114 \ 2115 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2116 "Number of collections before the adaptive sizing is started") \ 2117 \ 2118 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2119 "Collecton interval for printing information; zero => never") \ 2120 \ 2121 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2122 "Use adaptive minimum footprint as a goal") \ 2123 \ 2124 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2125 "Weight given to exponential resizing, between 0 and 100") \ 2126 \ 2127 product(uintx, AdaptiveTimeWeight, 25, \ 2128 "Weight given to time in adaptive policy, between 0 and 100") \ 2129 \ 2130 product(uintx, PausePadding, 1, \ 2131 "How much buffer to keep for pause time") \ 2132 \ 2133 product(uintx, PromotedPadding, 3, \ 2134 "How much buffer to keep for promotion failure") \ 2135 \ 2136 product(uintx, SurvivorPadding, 3, \ 2137 "How much buffer to keep for survivor overflow") \ 2138 \ 2139 product(uintx, AdaptivePermSizeWeight, 20, \ 2140 "Weight for perm gen exponential resizing, between 0 and 100") \ 2141 \ 2142 product(uintx, PermGenPadding, 3, \ 2143 "How much buffer to keep for perm gen sizing") \ 2144 \ 2145 product(uintx, ThresholdTolerance, 10, \ 2146 "Allowed collection cost difference between generations") \ 2147 \ 2148 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2149 "If collection costs are within margin, reduce both by full " \ 2150 "delta") \ 2151 \ 2152 product(uintx, YoungGenerationSizeIncrement, 20, \ 2153 "Adaptive size percentage change in young generation") \ 2154 \ 2155 product(uintx, YoungGenerationSizeSupplement, 80, \ 2156 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2157 \ 2158 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2159 "Decay factor to YoungedGenerationSizeSupplement") \ 2160 \ 2161 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2162 "Adaptive size percentage change in tenured generation") \ 2163 \ 2164 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2165 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2166 \ 2167 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2168 "Decay factor to TenuredGenerationSizeIncrement") \ 2169 \ 2170 product(uintx, MaxGCPauseMillis, max_uintx, \ 2171 "Adaptive size policy maximum GC pause time goal in msec, " \ 2172 "or (G1 Only) the max. GC time per MMU time slice") \ 2173 \ 2174 product(uintx, GCPauseIntervalMillis, 0, \ 2175 "Time slice for MMU specification") \ 2176 \ 2177 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2178 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2179 \ 2180 product(uintx, GCTimeRatio, 99, \ 2181 "Adaptive size policy application time to GC time ratio") \ 2182 \ 2183 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2184 "Adaptive size scale down factor for shrinking") \ 2185 \ 2186 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2187 "Adaptive size decays the major cost for long major intervals") \ 2188 \ 2189 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2190 "Time scale over which major costs decay") \ 2191 \ 2192 product(uintx, MinSurvivorRatio, 3, \ 2193 "Minimum ratio of young generation/survivor space size") \ 2194 \ 2195 product(uintx, InitialSurvivorRatio, 8, \ 2196 "Initial ratio of eden/survivor space size") \ 2197 \ 2198 product(uintx, BaseFootPrintEstimate, 256*M, \ 2199 "Estimate of footprint other than Java Heap") \ 2200 \ 2201 product(bool, UseGCOverheadLimit, true, \ 2202 "Use policy to limit of proportion of time spent in GC " \ 2203 "before an OutOfMemory error is thrown") \ 2204 \ 2205 product(uintx, GCTimeLimit, 98, \ 2206 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2207 "error is thrown (used with GCHeapFreeLimit)") \ 2208 \ 2209 product(uintx, GCHeapFreeLimit, 2, \ 2210 "Minimum percentage of free space after a full GC before an " \ 2211 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2212 \ 2213 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2214 "Number of consecutive collections before gc time limit fires") \ 2215 \ 2216 product(bool, PrintAdaptiveSizePolicy, false, \ 2217 "Print information about AdaptiveSizePolicy") \ 2218 \ 2219 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2220 "How far ahead to prefetch destination area (<= 0 means off)") \ 2221 \ 2222 product(intx, PrefetchScanIntervalInBytes, -1, \ 2223 "How far ahead to prefetch scan area (<= 0 means off)") \ 2224 \ 2225 product(intx, PrefetchFieldsAhead, -1, \ 2226 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2227 \ 2228 develop(bool, UsePrefetchQueue, true, \ 2229 "Use the prefetch queue during PS promotion") \ 2230 \ 2231 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2232 "Verify system before exiting") \ 2233 \ 2234 diagnostic(bool, VerifyBeforeGC, false, \ 2235 "Verify memory system before GC") \ 2236 \ 2237 diagnostic(bool, VerifyAfterGC, false, \ 2238 "Verify memory system after GC") \ 2239 \ 2240 diagnostic(bool, VerifyDuringGC, false, \ 2241 "Verify memory system during GC (between phases)") \ 2242 \ 2243 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2244 "Enable parallel memory system verification") \ 2245 \ 2246 diagnostic(bool, DeferInitialCardMark, false, \ 2247 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2248 "may arise from new_pre_store_barrier") \ 2249 \ 2250 diagnostic(bool, VerifyRememberedSets, false, \ 2251 "Verify GC remembered sets") \ 2252 \ 2253 diagnostic(bool, VerifyObjectStartArray, true, \ 2254 "Verify GC object start array if verify before/after") \ 2255 \ 2256 product(bool, DisableExplicitGC, false, \ 2257 "Tells whether calling System.gc() does a full GC") \ 2258 \ 2259 notproduct(bool, CheckMemoryInitialization, false, \ 2260 "Checks memory initialization") \ 2261 \ 2262 product(bool, CollectGen0First, false, \ 2263 "Collect youngest generation before each full GC") \ 2264 \ 2265 diagnostic(bool, BindCMSThreadToCPU, false, \ 2266 "Bind CMS Thread to CPU if possible") \ 2267 \ 2268 diagnostic(uintx, CPUForCMSThread, 0, \ 2269 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2270 \ 2271 product(bool, BindGCTaskThreadsToCPUs, false, \ 2272 "Bind GCTaskThreads to CPUs if possible") \ 2273 \ 2274 product(bool, UseGCTaskAffinity, false, \ 2275 "Use worker affinity when asking for GCTasks") \ 2276 \ 2277 product(uintx, ProcessDistributionStride, 4, \ 2278 "Stride through processors when distributing processes") \ 2279 \ 2280 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2281 "number of times the coordinator GC thread will sleep while " \ 2282 "yielding before giving up and resuming GC") \ 2283 \ 2284 product(uintx, CMSYieldSleepCount, 0, \ 2285 "number of times a GC thread (minus the coordinator) " \ 2286 "will sleep while yielding before giving up and resuming GC") \ 2287 \ 2288 /* gc tracing */ \ 2289 manageable(bool, PrintGC, false, \ 2290 "Print message at garbage collect") \ 2291 \ 2292 manageable(bool, PrintGCDetails, false, \ 2293 "Print more details at garbage collect") \ 2294 \ 2295 manageable(bool, PrintGCDateStamps, false, \ 2296 "Print date stamps at garbage collect") \ 2297 \ 2298 manageable(bool, PrintGCTimeStamps, false, \ 2299 "Print timestamps at garbage collect") \ 2300 \ 2301 product(bool, PrintGCTaskTimeStamps, false, \ 2302 "Print timestamps for individual gc worker thread tasks") \ 2303 \ 2304 develop(intx, ConcGCYieldTimeout, 0, \ 2305 "If non-zero, assert that GC threads yield within this # of ms.") \ 2306 \ 2307 notproduct(bool, TraceMarkSweep, false, \ 2308 "Trace mark sweep") \ 2309 \ 2310 product(bool, PrintReferenceGC, false, \ 2311 "Print times spent handling reference objects during GC " \ 2312 " (enabled only when PrintGCDetails)") \ 2313 \ 2314 develop(bool, TraceReferenceGC, false, \ 2315 "Trace handling of soft/weak/final/phantom references") \ 2316 \ 2317 develop(bool, TraceFinalizerRegistration, false, \ 2318 "Trace registration of final references") \ 2319 \ 2320 notproduct(bool, TraceScavenge, false, \ 2321 "Trace scavenge") \ 2322 \ 2323 product_rw(bool, TraceClassLoading, false, \ 2324 "Trace all classes loaded") \ 2325 \ 2326 product(bool, TraceClassLoadingPreorder, false, \ 2327 "Trace all classes loaded in order referenced (not loaded)") \ 2328 \ 2329 product_rw(bool, TraceClassUnloading, false, \ 2330 "Trace unloading of classes") \ 2331 \ 2332 product_rw(bool, TraceLoaderConstraints, false, \ 2333 "Trace loader constraints") \ 2334 \ 2335 product(bool, TraceGen0Time, false, \ 2336 "Trace accumulated time for Gen 0 collection") \ 2337 \ 2338 product(bool, TraceGen1Time, false, \ 2339 "Trace accumulated time for Gen 1 collection") \ 2340 \ 2341 product(bool, PrintTenuringDistribution, false, \ 2342 "Print tenuring age information") \ 2343 \ 2344 product_rw(bool, PrintHeapAtGC, false, \ 2345 "Print heap layout before and after each GC") \ 2346 \ 2347 product_rw(bool, PrintHeapAtGCExtended, false, \ 2348 "Prints extended information about the layout of the heap " \ 2349 "when -XX:+PrintHeapAtGC is set") \ 2350 \ 2351 product(bool, PrintHeapAtSIGBREAK, true, \ 2352 "Print heap layout in response to SIGBREAK") \ 2353 \ 2354 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2355 "Print a class histogram before any major stop-world GC") \ 2356 \ 2357 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2358 "Print a class histogram after any major stop-world GC") \ 2359 \ 2360 manageable(bool, PrintClassHistogram, false, \ 2361 "Print a histogram of class instances") \ 2362 \ 2363 develop(bool, TraceWorkGang, false, \ 2364 "Trace activities of work gangs") \ 2365 \ 2366 product(bool, TraceParallelOldGCTasks, false, \ 2367 "Trace multithreaded GC activity") \ 2368 \ 2369 develop(bool, TraceBlockOffsetTable, false, \ 2370 "Print BlockOffsetTable maps") \ 2371 \ 2372 develop(bool, TraceCardTableModRefBS, false, \ 2373 "Print CardTableModRefBS maps") \ 2374 \ 2375 develop(bool, TraceGCTaskManager, false, \ 2376 "Trace actions of the GC task manager") \ 2377 \ 2378 develop(bool, TraceGCTaskQueue, false, \ 2379 "Trace actions of the GC task queues") \ 2380 \ 2381 diagnostic(bool, TraceGCTaskThread, false, \ 2382 "Trace actions of the GC task threads") \ 2383 \ 2384 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2385 "Print the time taken by each parallel old gc phase." \ 2386 "PrintGCDetails must also be enabled.") \ 2387 \ 2388 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2389 "Trace parallel old gc marking phase") \ 2390 \ 2391 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2392 "Trace parallel old gc summary phase") \ 2393 \ 2394 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2395 "Trace parallel old gc compaction phase") \ 2396 \ 2397 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2398 "Trace parallel old gc dense prefix computation") \ 2399 \ 2400 develop(bool, IgnoreLibthreadGPFault, false, \ 2401 "Suppress workaround for libthread GP fault") \ 2402 \ 2403 product(bool, PrintJNIGCStalls, false, \ 2404 "Print diagnostic message when GC is stalled" \ 2405 "by JNI critical section") \ 2406 \ 2407 /* GC log rotation setting */ \ 2408 \ 2409 product(bool, UseGCLogFileRotation, false, \ 2410 "Prevent large gclog file for long running app. " \ 2411 "Requires -Xloggc:<filename>") \ 2412 \ 2413 product(uintx, NumberOfGCLogFiles, 0, \ 2414 "Number of gclog files in rotation, " \ 2415 "Default: 0, no rotation") \ 2416 \ 2417 product(uintx, GCLogFileSize, 0, \ 2418 "GC log file size, Default: 0 bytes, no rotation " \ 2419 "Only valid with UseGCLogFileRotation") \ 2420 \ 2421 /* JVMTI heap profiling */ \ 2422 \ 2423 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2424 "Trace JVMTI object tagging calls") \ 2425 \ 2426 diagnostic(bool, VerifyBeforeIteration, false, \ 2427 "Verify memory system before JVMTI iteration") \ 2428 \ 2429 /* compiler interface */ \ 2430 \ 2431 develop(bool, CIPrintCompilerName, false, \ 2432 "when CIPrint is active, print the name of the active compiler") \ 2433 \ 2434 develop(bool, CIPrintCompileQueue, false, \ 2435 "display the contents of the compile queue whenever a " \ 2436 "compilation is enqueued") \ 2437 \ 2438 develop(bool, CIPrintRequests, false, \ 2439 "display every request for compilation") \ 2440 \ 2441 product(bool, CITime, false, \ 2442 "collect timing information for compilation") \ 2443 \ 2444 develop(bool, CITimeEach, false, \ 2445 "display timing information after each successful compilation") \ 2446 \ 2447 develop(bool, CICountOSR, true, \ 2448 "use a separate counter when assigning ids to osr compilations") \ 2449 \ 2450 develop(bool, CICompileNatives, true, \ 2451 "compile native methods if supported by the compiler") \ 2452 \ 2453 develop_pd(bool, CICompileOSR, \ 2454 "compile on stack replacement methods if supported by the " \ 2455 "compiler") \ 2456 \ 2457 develop(bool, CIPrintMethodCodes, false, \ 2458 "print method bytecodes of the compiled code") \ 2459 \ 2460 develop(bool, CIPrintTypeFlow, false, \ 2461 "print the results of ciTypeFlow analysis") \ 2462 \ 2463 develop(bool, CITraceTypeFlow, false, \ 2464 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2465 \ 2466 develop(intx, CICloneLoopTestLimit, 100, \ 2467 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2468 \ 2469 develop(intx, OSROnlyBCI, -1, \ 2470 "OSR only at this bci. Negative values mean exclude that bci") \ 2471 \ 2472 /* temp diagnostics */ \ 2473 \ 2474 diagnostic(bool, TraceRedundantCompiles, false, \ 2475 "Have compile broker print when a request already in the queue is"\ 2476 " requested again") \ 2477 \ 2478 diagnostic(bool, InitialCompileFast, false, \ 2479 "Initial compile at CompLevel_fast_compile") \ 2480 \ 2481 diagnostic(bool, InitialCompileReallyFast, false, \ 2482 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2483 \ 2484 diagnostic(bool, FullProfileOnReInterpret, true, \ 2485 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2486 \ 2487 /* compiler */ \ 2488 \ 2489 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2490 "Number of compiler threads to run") \ 2491 \ 2492 product(intx, CompilationPolicyChoice, 0, \ 2493 "which compilation policy (0/1)") \ 2494 \ 2495 develop(bool, UseStackBanging, true, \ 2496 "use stack banging for stack overflow checks (required for " \ 2497 "proper StackOverflow handling; disable only to measure cost " \ 2498 "of stackbanging)") \ 2499 \ 2500 develop(bool, Use24BitFPMode, true, \ 2501 "Set 24-bit FPU mode on a per-compile basis ") \ 2502 \ 2503 develop(bool, Use24BitFP, true, \ 2504 "use FP instructions that produce 24-bit precise results") \ 2505 \ 2506 develop(bool, UseStrictFP, true, \ 2507 "use strict fp if modifier strictfp is set") \ 2508 \ 2509 develop(bool, GenerateSynchronizationCode, true, \ 2510 "generate locking/unlocking code for synchronized methods and " \ 2511 "monitors") \ 2512 \ 2513 develop(bool, GenerateCompilerNullChecks, true, \ 2514 "Generate explicit null checks for loads/stores/calls") \ 2515 \ 2516 develop(bool, GenerateRangeChecks, true, \ 2517 "Generate range checks for array accesses") \ 2518 \ 2519 develop_pd(bool, ImplicitNullChecks, \ 2520 "generate code for implicit null checks") \ 2521 \ 2522 product(bool, PrintSafepointStatistics, false, \ 2523 "print statistics about safepoint synchronization") \ 2524 \ 2525 product(intx, PrintSafepointStatisticsCount, 300, \ 2526 "total number of safepoint statistics collected " \ 2527 "before printing them out") \ 2528 \ 2529 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2530 "print safepoint statistics only when safepoint takes" \ 2531 " more than PrintSafepointSatisticsTimeout in millis") \ 2532 \ 2533 product(bool, TraceSafepointCleanupTime, false, \ 2534 "print the break down of clean up tasks performed during" \ 2535 " safepoint") \ 2536 \ 2537 develop(bool, InlineAccessors, true, \ 2538 "inline accessor methods (get/set)") \ 2539 \ 2540 product(bool, Inline, true, \ 2541 "enable inlining") \ 2542 \ 2543 product(bool, ClipInlining, true, \ 2544 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2545 \ 2546 develop(bool, UseCHA, true, \ 2547 "enable CHA") \ 2548 \ 2549 product(bool, UseTypeProfile, true, \ 2550 "Check interpreter profile for historically monomorphic calls") \ 2551 \ 2552 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2553 "% of major receiver type to all profiled receivers") \ 2554 \ 2555 notproduct(bool, TimeCompiler, false, \ 2556 "time the compiler") \ 2557 \ 2558 notproduct(bool, TimeCompiler2, false, \ 2559 "detailed time the compiler (requires +TimeCompiler)") \ 2560 \ 2561 diagnostic(bool, PrintInlining, false, \ 2562 "prints inlining optimizations") \ 2563 \ 2564 diagnostic(bool, PrintIntrinsics, false, \ 2565 "prints attempted and successful inlining of intrinsics") \ 2566 \ 2567 product(bool, UseCountLeadingZerosInstruction, false, \ 2568 "Use count leading zeros instruction") \ 2569 \ 2570 product(bool, UsePopCountInstruction, false, \ 2571 "Use population count instruction") \ 2572 \ 2573 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2574 "do not expand intrinsics whose (internal) names appear here") \ 2575 \ 2576 develop(bool, StressReflectiveCode, false, \ 2577 "Use inexact types at allocations, etc., to test reflection") \ 2578 \ 2579 develop(bool, EagerInitialization, false, \ 2580 "Eagerly initialize classes if possible") \ 2581 \ 2582 develop(bool, TraceMethodReplacement, false, \ 2583 "Print when methods are replaced do to recompilation") \ 2584 \ 2585 develop(bool, PrintMethodFlushing, false, \ 2586 "print the nmethods being flushed") \ 2587 \ 2588 notproduct(bool, LogMultipleMutexLocking, false, \ 2589 "log locking and unlocking of mutexes (only if multiple locks " \ 2590 "are held)") \ 2591 \ 2592 develop(bool, UseRelocIndex, false, \ 2593 "use an index to speed random access to relocations") \ 2594 \ 2595 develop(bool, StressCodeBuffers, false, \ 2596 "Exercise code buffer expansion and other rare state changes") \ 2597 \ 2598 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2599 "Generate extra debugging info for non-safepoints in nmethods") \ 2600 \ 2601 diagnostic(bool, DebugInlinedCalls, true, \ 2602 "If false, restricts profiled locations to the root method only") \ 2603 \ 2604 product(bool, PrintVMOptions, false, \ 2605 "Print flags that appeared on the command line") \ 2606 \ 2607 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2608 "Ignore unrecognized VM options") \ 2609 \ 2610 product(bool, PrintCommandLineFlags, false, \ 2611 "Print flags specified on command line or set by ergonomics") \ 2612 \ 2613 product(bool, PrintFlagsInitial, false, \ 2614 "Print all VM flags before argument processing and exit VM") \ 2615 \ 2616 product(bool, PrintFlagsFinal, false, \ 2617 "Print all VM flags after argument and ergonomic processing") \ 2618 \ 2619 notproduct(bool, PrintFlagsWithComments, false, \ 2620 "Print all VM flags with default values and descriptions and exit")\ 2621 \ 2622 diagnostic(bool, SerializeVMOutput, true, \ 2623 "Use a mutex to serialize output to tty and hotspot.log") \ 2624 \ 2625 diagnostic(bool, DisplayVMOutput, true, \ 2626 "Display all VM output on the tty, independently of LogVMOutput") \ 2627 \ 2628 diagnostic(bool, LogVMOutput, trueInDebug, \ 2629 "Save VM output to hotspot.log, or to LogFile") \ 2630 \ 2631 diagnostic(ccstr, LogFile, NULL, \ 2632 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2633 \ 2634 product(ccstr, ErrorFile, NULL, \ 2635 "If an error occurs, save the error data to this file " \ 2636 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2637 \ 2638 product(bool, DisplayVMOutputToStderr, false, \ 2639 "If DisplayVMOutput is true, display all VM output to stderr") \ 2640 \ 2641 product(bool, DisplayVMOutputToStdout, false, \ 2642 "If DisplayVMOutput is true, display all VM output to stdout") \ 2643 \ 2644 product(bool, UseHeavyMonitors, false, \ 2645 "use heavyweight instead of lightweight Java monitors") \ 2646 \ 2647 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2648 "print histogram of the symbol table") \ 2649 \ 2650 notproduct(bool, ExitVMOnVerifyError, false, \ 2651 "standard exit from VM if bytecode verify error " \ 2652 "(only in debug mode)") \ 2653 \ 2654 notproduct(ccstr, AbortVMOnException, NULL, \ 2655 "Call fatal if this exception is thrown. Example: " \ 2656 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2657 \ 2658 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2659 "Call fatal if the exception pointed by AbortVMOnException " \ 2660 "has this message.") \ 2661 \ 2662 develop(bool, DebugVtables, false, \ 2663 "add debugging code to vtable dispatch") \ 2664 \ 2665 develop(bool, PrintVtables, false, \ 2666 "print vtables when printing klass") \ 2667 \ 2668 notproduct(bool, PrintVtableStats, false, \ 2669 "print vtables stats at end of run") \ 2670 \ 2671 develop(bool, TraceCreateZombies, false, \ 2672 "trace creation of zombie nmethods") \ 2673 \ 2674 notproduct(bool, IgnoreLockingAssertions, false, \ 2675 "disable locking assertions (for speed)") \ 2676 \ 2677 notproduct(bool, VerifyLoopOptimizations, false, \ 2678 "verify major loop optimizations") \ 2679 \ 2680 product(bool, RangeCheckElimination, true, \ 2681 "Split loop iterations to eliminate range checks") \ 2682 \ 2683 develop_pd(bool, UncommonNullCast, \ 2684 "track occurrences of null in casts; adjust compiler tactics") \ 2685 \ 2686 develop(bool, TypeProfileCasts, true, \ 2687 "treat casts like calls for purposes of type profiling") \ 2688 \ 2689 develop(bool, MonomorphicArrayCheck, true, \ 2690 "Uncommon-trap array store checks that require full type check") \ 2691 \ 2692 diagnostic(bool, ProfileDynamicTypes, true, \ 2693 "do extra type profiling and use it more aggressively") \ 2694 \ 2695 develop(bool, DelayCompilationDuringStartup, true, \ 2696 "Delay invoking the compiler until main application class is " \ 2697 "loaded") \ 2698 \ 2699 develop(bool, CompileTheWorld, false, \ 2700 "Compile all methods in all classes in bootstrap class path " \ 2701 "(stress test)") \ 2702 \ 2703 develop(bool, CompileTheWorldPreloadClasses, true, \ 2704 "Preload all classes used by a class before start loading") \ 2705 \ 2706 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2707 "Force a safepoint every n compiles so sweeper can keep up") \ 2708 \ 2709 develop(bool, TraceIterativeGVN, false, \ 2710 "Print progress during Iterative Global Value Numbering") \ 2711 \ 2712 develop(bool, FillDelaySlots, true, \ 2713 "Fill delay slots (on SPARC only)") \ 2714 \ 2715 develop(bool, VerifyIterativeGVN, false, \ 2716 "Verify Def-Use modifications during sparse Iterative Global " \ 2717 "Value Numbering") \ 2718 \ 2719 notproduct(bool, TracePhaseCCP, false, \ 2720 "Print progress during Conditional Constant Propagation") \ 2721 \ 2722 develop(bool, TimeLivenessAnalysis, false, \ 2723 "Time computation of bytecode liveness analysis") \ 2724 \ 2725 develop(bool, TraceLivenessGen, false, \ 2726 "Trace the generation of liveness analysis information") \ 2727 \ 2728 notproduct(bool, TraceLivenessQuery, false, \ 2729 "Trace queries of liveness analysis information") \ 2730 \ 2731 notproduct(bool, CollectIndexSetStatistics, false, \ 2732 "Collect information about IndexSets") \ 2733 \ 2734 develop(bool, PrintDominators, false, \ 2735 "Print out dominator trees for GVN") \ 2736 \ 2737 develop(bool, UseLoopSafepoints, true, \ 2738 "Generate Safepoint nodes in every loop") \ 2739 \ 2740 notproduct(bool, TraceCISCSpill, false, \ 2741 "Trace allocators use of cisc spillable instructions") \ 2742 \ 2743 notproduct(bool, TraceSpilling, false, \ 2744 "Trace spilling") \ 2745 \ 2746 product(bool, SplitIfBlocks, true, \ 2747 "Clone compares and control flow through merge points to fold " \ 2748 "some branches") \ 2749 \ 2750 develop(intx, FastAllocateSizeLimit, 128*K, \ 2751 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2752 "Inline allocations larger than this in doublewords must go slow")\ 2753 \ 2754 product(bool, AggressiveOpts, false, \ 2755 "Enable aggressive optimizations - see arguments.cpp") \ 2756 \ 2757 product(bool, UseStringCache, false, \ 2758 "Enable String cache capabilities on String.java") \ 2759 \ 2760 /* statistics */ \ 2761 develop(bool, CountCompiledCalls, false, \ 2762 "counts method invocations") \ 2763 \ 2764 notproduct(bool, CountRuntimeCalls, false, \ 2765 "counts VM runtime calls") \ 2766 \ 2767 develop(bool, CountJNICalls, false, \ 2768 "counts jni method invocations") \ 2769 \ 2770 notproduct(bool, CountJVMCalls, false, \ 2771 "counts jvm method invocations") \ 2772 \ 2773 notproduct(bool, CountRemovableExceptions, false, \ 2774 "count exceptions that could be replaced by branches due to " \ 2775 "inlining") \ 2776 \ 2777 notproduct(bool, ICMissHistogram, false, \ 2778 "produce histogram of IC misses") \ 2779 \ 2780 notproduct(bool, PrintClassStatistics, false, \ 2781 "prints class statistics at end of run") \ 2782 \ 2783 notproduct(bool, PrintMethodStatistics, false, \ 2784 "prints method statistics at end of run") \ 2785 \ 2786 /* interpreter */ \ 2787 develop(bool, ClearInterpreterLocals, false, \ 2788 "Always clear local variables of interpreter activations upon " \ 2789 "entry") \ 2790 \ 2791 product_pd(bool, RewriteBytecodes, \ 2792 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2793 \ 2794 product_pd(bool, RewriteFrequentPairs, \ 2795 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2796 \ 2797 diagnostic(bool, PrintInterpreter, false, \ 2798 "Prints the generated interpreter code") \ 2799 \ 2800 product(bool, UseInterpreter, true, \ 2801 "Use interpreter for non-compiled methods") \ 2802 \ 2803 develop(bool, UseFastSignatureHandlers, true, \ 2804 "Use fast signature handlers for native calls") \ 2805 \ 2806 develop(bool, UseV8InstrsOnly, false, \ 2807 "Use SPARC-V8 Compliant instruction subset") \ 2808 \ 2809 product(bool, UseNiagaraInstrs, false, \ 2810 "Use Niagara-efficient instruction subset") \ 2811 \ 2812 develop(bool, UseCASForSwap, false, \ 2813 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2814 \ 2815 product(bool, UseLoopCounter, true, \ 2816 "Increment invocation counter on backward branch") \ 2817 \ 2818 product(bool, UseFastEmptyMethods, true, \ 2819 "Use fast method entry code for empty methods") \ 2820 \ 2821 product(bool, UseFastAccessorMethods, true, \ 2822 "Use fast method entry code for accessor methods") \ 2823 \ 2824 product_pd(bool, UseOnStackReplacement, \ 2825 "Use on stack replacement, calls runtime if invoc. counter " \ 2826 "overflows in loop") \ 2827 \ 2828 notproduct(bool, TraceOnStackReplacement, false, \ 2829 "Trace on stack replacement") \ 2830 \ 2831 develop(bool, PoisonOSREntry, true, \ 2832 "Detect abnormal calls to OSR code") \ 2833 \ 2834 product_pd(bool, PreferInterpreterNativeStubs, \ 2835 "Use always interpreter stubs for native methods invoked via " \ 2836 "interpreter") \ 2837 \ 2838 develop(bool, CountBytecodes, false, \ 2839 "Count number of bytecodes executed") \ 2840 \ 2841 develop(bool, PrintBytecodeHistogram, false, \ 2842 "Print histogram of the executed bytecodes") \ 2843 \ 2844 develop(bool, PrintBytecodePairHistogram, false, \ 2845 "Print histogram of the executed bytecode pairs") \ 2846 \ 2847 diagnostic(bool, PrintSignatureHandlers, false, \ 2848 "Print code generated for native method signature handlers") \ 2849 \ 2850 develop(bool, VerifyOops, false, \ 2851 "Do plausibility checks for oops") \ 2852 \ 2853 develop(bool, CheckUnhandledOops, false, \ 2854 "Check for unhandled oops in VM code") \ 2855 \ 2856 develop(bool, VerifyJNIFields, trueInDebug, \ 2857 "Verify jfieldIDs for instance fields") \ 2858 \ 2859 notproduct(bool, VerifyJNIEnvThread, false, \ 2860 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2861 "from JNI") \ 2862 \ 2863 develop(bool, VerifyFPU, false, \ 2864 "Verify FPU state (check for NaN's, etc.)") \ 2865 \ 2866 develop(bool, VerifyThread, false, \ 2867 "Watch the thread register for corruption (SPARC only)") \ 2868 \ 2869 develop(bool, VerifyActivationFrameSize, false, \ 2870 "Verify that activation frame didn't become smaller than its " \ 2871 "minimal size") \ 2872 \ 2873 develop(bool, TraceFrequencyInlining, false, \ 2874 "Trace frequency based inlining") \ 2875 \ 2876 notproduct(bool, TraceTypeProfile, false, \ 2877 "Trace type profile") \ 2878 \ 2879 develop_pd(bool, InlineIntrinsics, \ 2880 "Inline intrinsics that can be statically resolved") \ 2881 \ 2882 product_pd(bool, ProfileInterpreter, \ 2883 "Profile at the bytecode level during interpretation") \ 2884 \ 2885 develop_pd(bool, ProfileTraps, \ 2886 "Profile deoptimization traps at the bytecode level") \ 2887 \ 2888 product(intx, ProfileMaturityPercentage, 20, \ 2889 "number of method invocations/branches (expressed as % of " \ 2890 "CompileThreshold) before using the method's profile") \ 2891 \ 2892 develop(bool, PrintMethodData, false, \ 2893 "Print the results of +ProfileInterpreter at end of run") \ 2894 \ 2895 develop(bool, VerifyDataPointer, trueInDebug, \ 2896 "Verify the method data pointer during interpreter profiling") \ 2897 \ 2898 develop(bool, VerifyCompiledCode, false, \ 2899 "Include miscellaneous runtime verifications in nmethod code; " \ 2900 "default off because it disturbs nmethod size heuristics") \ 2901 \ 2902 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2903 "Manually make GC thread crash then dump java stack trace; " \ 2904 "Test only") \ 2905 \ 2906 /* compilation */ \ 2907 product(bool, UseCompiler, true, \ 2908 "use compilation") \ 2909 \ 2910 develop(bool, TraceCompilationPolicy, false, \ 2911 "Trace compilation policy") \ 2912 \ 2913 develop(bool, TimeCompilationPolicy, false, \ 2914 "Time the compilation policy") \ 2915 \ 2916 product(bool, UseCounterDecay, true, \ 2917 "adjust recompilation counters") \ 2918 \ 2919 develop(intx, CounterHalfLifeTime, 30, \ 2920 "half-life time of invocation counters (in secs)") \ 2921 \ 2922 develop(intx, CounterDecayMinIntervalLength, 500, \ 2923 "Min. ms. between invocation of CounterDecay") \ 2924 \ 2925 product(bool, AlwaysCompileLoopMethods, false, \ 2926 "when using recompilation, never interpret methods " \ 2927 "containing loops") \ 2928 \ 2929 product(bool, DontCompileHugeMethods, true, \ 2930 "don't compile methods > HugeMethodLimit") \ 2931 \ 2932 /* Bytecode escape analysis estimation. */ \ 2933 product(bool, EstimateArgEscape, true, \ 2934 "Analyze bytecodes to estimate escape state of arguments") \ 2935 \ 2936 product(intx, BCEATraceLevel, 0, \ 2937 "How much tracing to do of bytecode escape analysis estimates") \ 2938 \ 2939 product(intx, MaxBCEAEstimateLevel, 5, \ 2940 "Maximum number of nested calls that are analyzed by BC EA.") \ 2941 \ 2942 product(intx, MaxBCEAEstimateSize, 150, \ 2943 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2944 \ 2945 product(intx, AllocatePrefetchStyle, 1, \ 2946 "0 = no prefetch, " \ 2947 "1 = prefetch instructions for each allocation, " \ 2948 "2 = use TLAB watermark to gate allocation prefetch, " \ 2949 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2950 \ 2951 product(intx, AllocatePrefetchDistance, -1, \ 2952 "Distance to prefetch ahead of allocation pointer") \ 2953 \ 2954 product(intx, AllocatePrefetchLines, 3, \ 2955 "Number of lines to prefetch ahead of array allocation pointer") \ 2956 \ 2957 product(intx, AllocateInstancePrefetchLines, 1, \ 2958 "Number of lines to prefetch ahead of instance allocation pointer") \ 2959 \ 2960 product(intx, AllocatePrefetchStepSize, 16, \ 2961 "Step size in bytes of sequential prefetch instructions") \ 2962 \ 2963 product(intx, AllocatePrefetchInstr, 0, \ 2964 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2965 \ 2966 product(intx, ReadPrefetchInstr, 0, \ 2967 "Prefetch instruction to prefetch ahead") \ 2968 \ 2969 product(uintx, ArraycopySrcPrefetchDistance, 0, \ 2970 "Distance to prefetch source array in arracopy") \ 2971 \ 2972 product(uintx, ArraycopyDstPrefetchDistance, 0, \ 2973 "Distance to prefetch destination array in arracopy") \ 2974 \ 2975 /* deoptimization */ \ 2976 develop(bool, TraceDeoptimization, false, \ 2977 "Trace deoptimization") \ 2978 \ 2979 develop(bool, DebugDeoptimization, false, \ 2980 "Tracing various information while debugging deoptimization") \ 2981 \ 2982 product(intx, SelfDestructTimer, 0, \ 2983 "Will cause VM to terminate after a given time (in minutes) " \ 2984 "(0 means off)") \ 2985 \ 2986 product(intx, MaxJavaStackTraceDepth, 1024, \ 2987 "Max. no. of lines in the stack trace for Java exceptions " \ 2988 "(0 means all)") \ 2989 \ 2990 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2991 "Guarantee a safepoint (at least) every so many milliseconds " \ 2992 "(0 means none)")) \ 2993 \ 2994 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2995 "Guarantee a safepoint (at least) every so many milliseconds " \ 2996 "(0 means none)")) \ 2997 \ 2998 product(intx, SafepointTimeoutDelay, 10000, \ 2999 "Delay in milliseconds for option SafepointTimeout") \ 3000 \ 3001 product(intx, NmethodSweepFraction, 4, \ 3002 "Number of invocations of sweeper to cover all nmethods") \ 3003 \ 3004 product(intx, NmethodSweepCheckInterval, 5, \ 3005 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3006 \ 3007 notproduct(bool, LogSweeper, false, \ 3008 "Keep a ring buffer of sweeper activity") \ 3009 \ 3010 notproduct(intx, SweeperLogEntries, 1024, \ 3011 "Number of records in the ring buffer of sweeper activity") \ 3012 \ 3013 notproduct(intx, MemProfilingInterval, 500, \ 3014 "Time between each invocation of the MemProfiler") \ 3015 \ 3016 develop(intx, MallocCatchPtr, -1, \ 3017 "Hit breakpoint when mallocing/freeing this pointer") \ 3018 \ 3019 notproduct(intx, AssertRepeat, 1, \ 3020 "number of times to evaluate expression in assert " \ 3021 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3022 \ 3023 notproduct(ccstrlist, SuppressErrorAt, "", \ 3024 "List of assertions (file:line) to muzzle") \ 3025 \ 3026 notproduct(uintx, HandleAllocationLimit, 1024, \ 3027 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3028 "is used") \ 3029 \ 3030 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3031 "Threshold for total handle allocation when " \ 3032 "+TraceHandleAllocation is used") \ 3033 \ 3034 develop(intx, StackPrintLimit, 100, \ 3035 "number of stack frames to print in VM-level stack dump") \ 3036 \ 3037 notproduct(intx, MaxElementPrintSize, 256, \ 3038 "maximum number of elements to print") \ 3039 \ 3040 notproduct(intx, MaxSubklassPrintSize, 4, \ 3041 "maximum number of subklasses to print when printing klass") \ 3042 \ 3043 product(intx, MaxInlineLevel, 9, \ 3044 "maximum number of nested calls that are inlined") \ 3045 \ 3046 product(intx, MaxRecursiveInlineLevel, 1, \ 3047 "maximum number of nested recursive calls that are inlined") \ 3048 \ 3049 product_pd(intx, InlineSmallCode, \ 3050 "Only inline already compiled methods if their code size is " \ 3051 "less than this") \ 3052 \ 3053 product(intx, MaxInlineSize, 35, \ 3054 "maximum bytecode size of a method to be inlined") \ 3055 \ 3056 product_pd(intx, FreqInlineSize, \ 3057 "maximum bytecode size of a frequent method to be inlined") \ 3058 \ 3059 product(intx, MaxTrivialSize, 6, \ 3060 "maximum bytecode size of a trivial method to be inlined") \ 3061 \ 3062 product(intx, MinInliningThreshold, 250, \ 3063 "min. invocation count a method needs to have to be inlined") \ 3064 \ 3065 develop(intx, AlignEntryCode, 4, \ 3066 "aligns entry code to specified value (in bytes)") \ 3067 \ 3068 develop(intx, MethodHistogramCutoff, 100, \ 3069 "cutoff value for method invoc. histogram (+CountCalls)") \ 3070 \ 3071 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3072 "# of interpreted methods to show in profile") \ 3073 \ 3074 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3075 "# of compiled methods to show in profile") \ 3076 \ 3077 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3078 "# of stub methods to show in profile") \ 3079 \ 3080 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3081 "# of runtime stub nodes to show in profile") \ 3082 \ 3083 product(intx, ProfileIntervalsTicks, 100, \ 3084 "# of ticks between printing of interval profile " \ 3085 "(+ProfileIntervals)") \ 3086 \ 3087 notproduct(intx, ScavengeALotInterval, 1, \ 3088 "Interval between which scavenge will occur with +ScavengeALot") \ 3089 \ 3090 notproduct(intx, FullGCALotInterval, 1, \ 3091 "Interval between which full gc will occur with +FullGCALot") \ 3092 \ 3093 notproduct(intx, FullGCALotStart, 0, \ 3094 "For which invocation to start FullGCAlot") \ 3095 \ 3096 notproduct(intx, FullGCALotDummies, 32*K, \ 3097 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3098 "to move") \ 3099 \ 3100 develop(intx, DontYieldALotInterval, 10, \ 3101 "Interval between which yields will be dropped (milliseconds)") \ 3102 \ 3103 develop(intx, MinSleepInterval, 1, \ 3104 "Minimum sleep() interval (milliseconds) when " \ 3105 "ConvertSleepToYield is off (used for SOLARIS)") \ 3106 \ 3107 product(intx, EventLogLength, 2000, \ 3108 "maximum nof events in event log") \ 3109 \ 3110 develop(intx, ProfilerPCTickThreshold, 15, \ 3111 "Number of ticks in a PC buckets to be a hotspot") \ 3112 \ 3113 notproduct(intx, DeoptimizeALotInterval, 5, \ 3114 "Number of exits until DeoptimizeALot kicks in") \ 3115 \ 3116 notproduct(intx, ZombieALotInterval, 5, \ 3117 "Number of exits until ZombieALot kicks in") \ 3118 \ 3119 develop(bool, StressNonEntrant, false, \ 3120 "Mark nmethods non-entrant at registration") \ 3121 \ 3122 diagnostic(intx, MallocVerifyInterval, 0, \ 3123 "if non-zero, verify C heap after every N calls to " \ 3124 "malloc/realloc/free") \ 3125 \ 3126 diagnostic(intx, MallocVerifyStart, 0, \ 3127 "if non-zero, start verifying C heap after Nth call to " \ 3128 "malloc/realloc/free") \ 3129 \ 3130 product(intx, TypeProfileWidth, 2, \ 3131 "number of receiver types to record in call/cast profile") \ 3132 \ 3133 develop(intx, BciProfileWidth, 2, \ 3134 "number of return bci's to record in ret profile") \ 3135 \ 3136 product(intx, PerMethodRecompilationCutoff, 400, \ 3137 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3138 \ 3139 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3140 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3141 \ 3142 product(intx, PerMethodTrapLimit, 100, \ 3143 "Limit on traps (of one kind) in a method (includes inlines)") \ 3144 \ 3145 product(intx, PerBytecodeTrapLimit, 4, \ 3146 "Limit on traps (of one kind) at a particular BCI") \ 3147 \ 3148 develop(intx, FreqCountInvocations, 1, \ 3149 "Scaling factor for branch frequencies (deprecated)") \ 3150 \ 3151 develop(intx, InlineFrequencyRatio, 20, \ 3152 "Ratio of call site execution to caller method invocation") \ 3153 \ 3154 develop_pd(intx, InlineFrequencyCount, \ 3155 "Count of call site execution necessary to trigger frequent " \ 3156 "inlining") \ 3157 \ 3158 develop(intx, InlineThrowCount, 50, \ 3159 "Force inlining of interpreted methods that throw this often") \ 3160 \ 3161 develop(intx, InlineThrowMaxSize, 200, \ 3162 "Force inlining of throwing methods smaller than this") \ 3163 \ 3164 product(intx, AliasLevel, 3, \ 3165 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3166 "2 for class split, 3 for unique instances") \ 3167 \ 3168 develop(bool, VerifyAliases, false, \ 3169 "perform extra checks on the results of alias analysis") \ 3170 \ 3171 develop(intx, ProfilerNodeSize, 1024, \ 3172 "Size in K to allocate for the Profile Nodes of each thread") \ 3173 \ 3174 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3175 "Number of times to spin wait on a v8 atomic operation lock") \ 3176 \ 3177 product(intx, ReadSpinIterations, 100, \ 3178 "Number of read attempts before a yield (spin inner loop)") \ 3179 \ 3180 product_pd(intx, PreInflateSpin, \ 3181 "Number of times to spin wait before inflation") \ 3182 \ 3183 product(intx, PreBlockSpin, 10, \ 3184 "Number of times to spin in an inflated lock before going to " \ 3185 "an OS lock") \ 3186 \ 3187 /* gc parameters */ \ 3188 product(uintx, InitialHeapSize, 0, \ 3189 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3190 \ 3191 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3192 "Maximum heap size (in bytes)") \ 3193 \ 3194 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3195 "Initial tenured generation size (in bytes)") \ 3196 \ 3197 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3198 "Initial new generation size (in bytes)") \ 3199 \ 3200 product(uintx, MaxNewSize, max_uintx, \ 3201 "Maximum new generation size (in bytes), max_uintx means set " \ 3202 "ergonomically") \ 3203 \ 3204 product(uintx, PretenureSizeThreshold, 0, \ 3205 "Maximum size in bytes of objects allocated in DefNew " \ 3206 "generation; zero means no maximum") \ 3207 \ 3208 product(uintx, TLABSize, 0, \ 3209 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3210 \ 3211 product(uintx, MinTLABSize, 2*K, \ 3212 "Minimum allowed TLAB size (in bytes)") \ 3213 \ 3214 product(uintx, TLABAllocationWeight, 35, \ 3215 "Allocation averaging weight") \ 3216 \ 3217 product(uintx, TLABWasteTargetPercent, 1, \ 3218 "Percentage of Eden that can be wasted") \ 3219 \ 3220 product(uintx, TLABRefillWasteFraction, 64, \ 3221 "Max TLAB waste at a refill (internal fragmentation)") \ 3222 \ 3223 product(uintx, TLABWasteIncrement, 4, \ 3224 "Increment allowed waste at slow allocation") \ 3225 \ 3226 product(intx, SurvivorRatio, 8, \ 3227 "Ratio of eden/survivor space size") \ 3228 \ 3229 product(intx, NewRatio, 2, \ 3230 "Ratio of new/old generation sizes") \ 3231 \ 3232 product_pd(uintx, NewSizeThreadIncrease, \ 3233 "Additional size added to desired new generation size per " \ 3234 "non-daemon thread (in bytes)") \ 3235 \ 3236 product_pd(uintx, PermSize, \ 3237 "Initial size of permanent generation (in bytes)") \ 3238 \ 3239 product_pd(uintx, MaxPermSize, \ 3240 "Maximum size of permanent generation (in bytes)") \ 3241 \ 3242 product(uintx, MinHeapFreeRatio, 40, \ 3243 "Min percentage of heap free after GC to avoid expansion") \ 3244 \ 3245 product(uintx, MaxHeapFreeRatio, 70, \ 3246 "Max percentage of heap free after GC to avoid shrinking") \ 3247 \ 3248 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3249 "Number of milliseconds per MB of free space in the heap") \ 3250 \ 3251 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3252 "Min change in heap space due to GC (in bytes)") \ 3253 \ 3254 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3255 "Min expansion of permanent heap (in bytes)") \ 3256 \ 3257 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3258 "Max expansion of permanent heap without full GC (in bytes)") \ 3259 \ 3260 product(intx, QueuedAllocationWarningCount, 0, \ 3261 "Number of times an allocation that queues behind a GC " \ 3262 "will retry before printing a warning") \ 3263 \ 3264 diagnostic(uintx, VerifyGCStartAt, 0, \ 3265 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3266 \ 3267 diagnostic(intx, VerifyGCLevel, 0, \ 3268 "Generation level at which to start +VerifyBefore/AfterGC") \ 3269 \ 3270 develop(uintx, ExitAfterGCNum, 0, \ 3271 "If non-zero, exit after this GC.") \ 3272 \ 3273 product(intx, MaxTenuringThreshold, 15, \ 3274 "Maximum value for tenuring threshold") \ 3275 \ 3276 product(intx, InitialTenuringThreshold, 7, \ 3277 "Initial value for tenuring threshold") \ 3278 \ 3279 product(intx, TargetSurvivorRatio, 50, \ 3280 "Desired percentage of survivor space used after scavenge") \ 3281 \ 3282 product(uintx, MarkSweepDeadRatio, 5, \ 3283 "Percentage (0-100) of the old gen allowed as dead wood." \ 3284 "Serial mark sweep treats this as both the min and max value." \ 3285 "CMS uses this value only if it falls back to mark sweep." \ 3286 "Par compact uses a variable scale based on the density of the" \ 3287 "generation and treats this as the max value when the heap is" \ 3288 "either completely full or completely empty. Par compact also" \ 3289 "has a smaller default value; see arguments.cpp.") \ 3290 \ 3291 product(uintx, PermMarkSweepDeadRatio, 20, \ 3292 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3293 "See MarkSweepDeadRatio for collector-specific comments.") \ 3294 \ 3295 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3296 "How often should we fully compact the heap (ignoring the dead " \ 3297 "space parameters)") \ 3298 \ 3299 product(intx, PrintCMSStatistics, 0, \ 3300 "Statistics for CMS") \ 3301 \ 3302 product(bool, PrintCMSInitiationStatistics, false, \ 3303 "Statistics for initiating a CMS collection") \ 3304 \ 3305 product(intx, PrintFLSStatistics, 0, \ 3306 "Statistics for CMS' FreeListSpace") \ 3307 \ 3308 product(intx, PrintFLSCensus, 0, \ 3309 "Census for CMS' FreeListSpace") \ 3310 \ 3311 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3312 "Delay in ms between expansion and allocation") \ 3313 \ 3314 product(intx, DeferThrSuspendLoopCount, 4000, \ 3315 "(Unstable) Number of times to iterate in safepoint loop " \ 3316 " before blocking VM threads ") \ 3317 \ 3318 product(intx, DeferPollingPageLoopCount, -1, \ 3319 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3320 "before changing safepoint polling page to RO ") \ 3321 \ 3322 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3323 \ 3324 product(bool, PSChunkLargeArrays, true, \ 3325 "true: process large arrays in chunks") \ 3326 \ 3327 product(uintx, GCDrainStackTargetSize, 64, \ 3328 "how many entries we'll try to leave on the stack during " \ 3329 "parallel GC") \ 3330 \ 3331 /* stack parameters */ \ 3332 product_pd(intx, StackYellowPages, \ 3333 "Number of yellow zone (recoverable overflows) pages") \ 3334 \ 3335 product_pd(intx, StackRedPages, \ 3336 "Number of red zone (unrecoverable overflows) pages") \ 3337 \ 3338 product_pd(intx, StackShadowPages, \ 3339 "Number of shadow zone (for overflow checking) pages" \ 3340 " this should exceed the depth of the VM and native call stack") \ 3341 \ 3342 product_pd(intx, ThreadStackSize, \ 3343 "Thread Stack Size (in Kbytes)") \ 3344 \ 3345 product_pd(intx, VMThreadStackSize, \ 3346 "Non-Java Thread Stack Size (in Kbytes)") \ 3347 \ 3348 product_pd(intx, CompilerThreadStackSize, \ 3349 "Compiler Thread Stack Size (in Kbytes)") \ 3350 \ 3351 develop_pd(uintx, JVMInvokeMethodSlack, \ 3352 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3353 \ 3354 product(uintx, ThreadSafetyMargin, 50*M, \ 3355 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3356 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3357 "disable this feature") \ 3358 \ 3359 /* code cache parameters */ \ 3360 develop(uintx, CodeCacheSegmentSize, 64, \ 3361 "Code cache segment size (in bytes) - smallest unit of " \ 3362 "allocation") \ 3363 \ 3364 develop_pd(intx, CodeEntryAlignment, \ 3365 "Code entry alignment for generated code (in bytes)") \ 3366 \ 3367 product_pd(intx, OptoLoopAlignment, \ 3368 "Align inner loops to zero relative to this modulus") \ 3369 \ 3370 product_pd(uintx, InitialCodeCacheSize, \ 3371 "Initial code cache size (in bytes)") \ 3372 \ 3373 product_pd(uintx, ReservedCodeCacheSize, \ 3374 "Reserved code cache size (in bytes) - maximum code cache size") \ 3375 \ 3376 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3377 "When less than X space left, we stop compiling.") \ 3378 \ 3379 product_pd(uintx, CodeCacheExpansionSize, \ 3380 "Code cache expansion size (in bytes)") \ 3381 \ 3382 develop_pd(uintx, CodeCacheMinBlockLength, \ 3383 "Minimum number of segments in a code cache block.") \ 3384 \ 3385 notproduct(bool, ExitOnFullCodeCache, false, \ 3386 "Exit the VM if we fill the code cache.") \ 3387 \ 3388 product(bool, UseCodeCacheFlushing, true, \ 3389 "Attempt to clean the code cache before shutting off compiler") \ 3390 \ 3391 product(intx, MinCodeCacheFlushingInterval, 30, \ 3392 "Min number of seconds between code cache cleaning sessions") \ 3393 \ 3394 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3395 "When less than X space left, start code cache cleaning") \ 3396 \ 3397 /* interpreter debugging */ \ 3398 develop(intx, BinarySwitchThreshold, 5, \ 3399 "Minimal number of lookupswitch entries for rewriting to binary " \ 3400 "switch") \ 3401 \ 3402 develop(intx, StopInterpreterAt, 0, \ 3403 "Stops interpreter execution at specified bytecode number") \ 3404 \ 3405 develop(intx, TraceBytecodesAt, 0, \ 3406 "Traces bytecodes starting with specified bytecode number") \ 3407 \ 3408 /* compiler interface */ \ 3409 develop(intx, CIStart, 0, \ 3410 "the id of the first compilation to permit") \ 3411 \ 3412 develop(intx, CIStop, -1, \ 3413 "the id of the last compilation to permit") \ 3414 \ 3415 develop(intx, CIStartOSR, 0, \ 3416 "the id of the first osr compilation to permit " \ 3417 "(CICountOSR must be on)") \ 3418 \ 3419 develop(intx, CIStopOSR, -1, \ 3420 "the id of the last osr compilation to permit " \ 3421 "(CICountOSR must be on)") \ 3422 \ 3423 develop(intx, CIBreakAtOSR, -1, \ 3424 "id of osr compilation to break at") \ 3425 \ 3426 develop(intx, CIBreakAt, -1, \ 3427 "id of compilation to break at") \ 3428 \ 3429 product(ccstrlist, CompileOnly, "", \ 3430 "List of methods (pkg/class.name) to restrict compilation to") \ 3431 \ 3432 product(ccstr, CompileCommandFile, NULL, \ 3433 "Read compiler commands from this file [.hotspot_compiler]") \ 3434 \ 3435 product(ccstrlist, CompileCommand, "", \ 3436 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3437 \ 3438 product(bool, CICompilerCountPerCPU, false, \ 3439 "1 compiler thread for log(N CPUs)") \ 3440 \ 3441 develop(intx, CIFireOOMAt, -1, \ 3442 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3443 "(non-negative value throws OOM after this many CI accesses " \ 3444 "in each compile)") \ 3445 \ 3446 develop(intx, CIFireOOMAtDelay, -1, \ 3447 "Wait for this many CI accesses to occur in all compiles before " \ 3448 "beginning to throw OutOfMemoryErrors in each compile") \ 3449 \ 3450 notproduct(bool, CIObjectFactoryVerify, false, \ 3451 "enable potentially expensive verification in ciObjectFactory") \ 3452 \ 3453 /* Priorities */ \ 3454 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3455 \ 3456 product(intx, ThreadPriorityPolicy, 0, \ 3457 "0 : Normal. "\ 3458 " VM chooses priorities that are appropriate for normal "\ 3459 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3460 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3461 " map to lower native priority values. On Windows applications"\ 3462 " are allowed to use higher native priorities. However, with "\ 3463 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3464 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3465 " interfere with system threads. On Linux thread priorities "\ 3466 " are ignored because the OS does not support static priority "\ 3467 " in SCHED_OTHER scheduling class which is the only choice for"\ 3468 " non-root, non-realtime applications. "\ 3469 "1 : Aggressive. "\ 3470 " Java thread priorities map over to the entire range of "\ 3471 " native thread priorities. Higher Java thread priorities map "\ 3472 " to higher native thread priorities. This policy should be "\ 3473 " used with care, as sometimes it can cause performance "\ 3474 " degradation in the application and/or the entire system. On "\ 3475 " Linux this policy requires root privilege.") \ 3476 \ 3477 product(bool, ThreadPriorityVerbose, false, \ 3478 "print priority changes") \ 3479 \ 3480 product(intx, DefaultThreadPriority, -1, \ 3481 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3482 \ 3483 product(intx, CompilerThreadPriority, -1, \ 3484 "what priority should compiler threads run at (-1 means no change)") \ 3485 \ 3486 product(intx, VMThreadPriority, -1, \ 3487 "what priority should VM threads run at (-1 means no change)") \ 3488 \ 3489 product(bool, CompilerThreadHintNoPreempt, true, \ 3490 "(Solaris only) Give compiler threads an extra quanta") \ 3491 \ 3492 product(bool, VMThreadHintNoPreempt, false, \ 3493 "(Solaris only) Give VM thread an extra quanta") \ 3494 \ 3495 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3496 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3497 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3498 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3499 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3500 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3501 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3502 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3503 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3504 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3505 \ 3506 /* compiler debugging */ \ 3507 notproduct(intx, CompileTheWorldStartAt, 1, \ 3508 "First class to consider when using +CompileTheWorld") \ 3509 \ 3510 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3511 "Last class to consider when using +CompileTheWorld") \ 3512 \ 3513 develop(intx, NewCodeParameter, 0, \ 3514 "Testing Only: Create a dedicated integer parameter before " \ 3515 "putback") \ 3516 \ 3517 /* new oopmap storage allocation */ \ 3518 develop(intx, MinOopMapAllocation, 8, \ 3519 "Minimum number of OopMap entries in an OopMapSet") \ 3520 \ 3521 /* Background Compilation */ \ 3522 develop(intx, LongCompileThreshold, 50, \ 3523 "Used with +TraceLongCompiles") \ 3524 \ 3525 product(intx, StarvationMonitorInterval, 200, \ 3526 "Pause between each check in ms") \ 3527 \ 3528 /* recompilation */ \ 3529 product_pd(intx, CompileThreshold, \ 3530 "number of interpreted method invocations before (re-)compiling") \ 3531 \ 3532 product_pd(intx, BackEdgeThreshold, \ 3533 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3534 \ 3535 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3536 "Interpreter (tier 0) invocation notification frequency.") \ 3537 \ 3538 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3539 "C1 without MDO (tier 2) invocation notification frequency.") \ 3540 \ 3541 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3542 "C1 with MDO profiling (tier 3) invocation notification " \ 3543 "frequency.") \ 3544 \ 3545 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3546 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3547 \ 3548 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3549 "Interpreter (tier 0) invocation notification frequency.") \ 3550 \ 3551 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3552 "C1 without MDO (tier 2) invocation notification frequency.") \ 3553 \ 3554 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3555 "C1 with MDO profiling (tier 3) invocation notification " \ 3556 "frequency.") \ 3557 \ 3558 product(intx, Tier2CompileThreshold, 0, \ 3559 "threshold at which tier 2 compilation is invoked") \ 3560 \ 3561 product(intx, Tier2BackEdgeThreshold, 0, \ 3562 "Back edge threshold at which tier 2 compilation is invoked") \ 3563 \ 3564 product(intx, Tier3InvocationThreshold, 200, \ 3565 "Compile if number of method invocations crosses this " \ 3566 "threshold") \ 3567 \ 3568 product(intx, Tier3MinInvocationThreshold, 100, \ 3569 "Minimum invocation to compile at tier 3") \ 3570 \ 3571 product(intx, Tier3CompileThreshold, 2000, \ 3572 "Threshold at which tier 3 compilation is invoked (invocation " \ 3573 "minimum must be satisfied.") \ 3574 \ 3575 product(intx, Tier3BackEdgeThreshold, 7000, \ 3576 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3577 \ 3578 product(intx, Tier4InvocationThreshold, 5000, \ 3579 "Compile if number of method invocations crosses this " \ 3580 "threshold") \ 3581 \ 3582 product(intx, Tier4MinInvocationThreshold, 600, \ 3583 "Minimum invocation to compile at tier 4") \ 3584 \ 3585 product(intx, Tier4CompileThreshold, 15000, \ 3586 "Threshold at which tier 4 compilation is invoked (invocation " \ 3587 "minimum must be satisfied.") \ 3588 \ 3589 product(intx, Tier4BackEdgeThreshold, 40000, \ 3590 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3591 \ 3592 product(intx, Tier3DelayOn, 5, \ 3593 "If C2 queue size grows over this amount per compiler thread " \ 3594 "stop compiling at tier 3 and start compiling at tier 2") \ 3595 \ 3596 product(intx, Tier3DelayOff, 2, \ 3597 "If C2 queue size is less than this amount per compiler thread " \ 3598 "allow methods compiled at tier 2 transition to tier 3") \ 3599 \ 3600 product(intx, Tier3LoadFeedback, 5, \ 3601 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3602 "reaches this amount per compiler thread") \ 3603 \ 3604 product(intx, Tier4LoadFeedback, 3, \ 3605 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3606 "reaches this amount per compiler thread") \ 3607 \ 3608 product(intx, TieredCompileTaskTimeout, 50, \ 3609 "Kill compile task if method was not used within " \ 3610 "given timeout in milliseconds") \ 3611 \ 3612 product(intx, TieredStopAtLevel, 4, \ 3613 "Stop at given compilation level") \ 3614 \ 3615 product(intx, Tier0ProfilingStartPercentage, 200, \ 3616 "Start profiling in interpreter if the counters exceed tier 3" \ 3617 "thresholds by the specified percentage") \ 3618 \ 3619 product(intx, TieredRateUpdateMinTime, 1, \ 3620 "Minimum rate sampling interval (in milliseconds)") \ 3621 \ 3622 product(intx, TieredRateUpdateMaxTime, 25, \ 3623 "Maximum rate sampling interval (in milliseconds)") \ 3624 \ 3625 product_pd(bool, TieredCompilation, \ 3626 "Enable tiered compilation") \ 3627 \ 3628 product(bool, PrintTieredEvents, false, \ 3629 "Print tiered events notifications") \ 3630 \ 3631 product(bool, StressTieredRuntime, false, \ 3632 "Alternate client and server compiler on compile requests") \ 3633 \ 3634 product_pd(intx, OnStackReplacePercentage, \ 3635 "NON_TIERED number of method invocations/branches (expressed as %"\ 3636 "of CompileThreshold) before (re-)compiling OSR code") \ 3637 \ 3638 product(intx, InterpreterProfilePercentage, 33, \ 3639 "NON_TIERED number of method invocations/branches (expressed as %"\ 3640 "of CompileThreshold) before profiling in the interpreter") \ 3641 \ 3642 develop(intx, MaxRecompilationSearchLength, 10, \ 3643 "max. # frames to inspect searching for recompilee") \ 3644 \ 3645 develop(intx, MaxInterpretedSearchLength, 3, \ 3646 "max. # interp. frames to skip when searching for recompilee") \ 3647 \ 3648 develop(intx, DesiredMethodLimit, 8000, \ 3649 "desired max. method size (in bytecodes) after inlining") \ 3650 \ 3651 develop(intx, HugeMethodLimit, 8000, \ 3652 "don't compile methods larger than this if " \ 3653 "+DontCompileHugeMethods") \ 3654 \ 3655 /* New JDK 1.4 reflection implementation */ \ 3656 \ 3657 develop(bool, UseNewReflection, true, \ 3658 "Temporary flag for transition to reflection based on dynamic " \ 3659 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3660 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3661 "changes were needed") \ 3662 \ 3663 develop(bool, VerifyReflectionBytecodes, false, \ 3664 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3665 "in situations like that described in 4486457 or for " \ 3666 "constructors generated for serialization, so can not be enabled "\ 3667 "in product.") \ 3668 \ 3669 product(bool, ReflectionWrapResolutionErrors, true, \ 3670 "Temporary flag for transition to AbstractMethodError wrapped " \ 3671 "in InvocationTargetException. See 6531596") \ 3672 \ 3673 \ 3674 develop(intx, FastSuperclassLimit, 8, \ 3675 "Depth of hardwired instanceof accelerator array") \ 3676 \ 3677 /* Properties for Java libraries */ \ 3678 \ 3679 product(intx, MaxDirectMemorySize, -1, \ 3680 "Maximum total size of NIO direct-buffer allocations") \ 3681 \ 3682 /* temporary developer defined flags */ \ 3683 \ 3684 diagnostic(bool, UseNewCode, false, \ 3685 "Testing Only: Use the new version while testing") \ 3686 \ 3687 diagnostic(bool, UseNewCode2, false, \ 3688 "Testing Only: Use the new version while testing") \ 3689 \ 3690 diagnostic(bool, UseNewCode3, false, \ 3691 "Testing Only: Use the new version while testing") \ 3692 \ 3693 /* flags for performance data collection */ \ 3694 \ 3695 product(bool, UsePerfData, falseInEmbedded, \ 3696 "Flag to disable jvmstat instrumentation for performance testing" \ 3697 "and problem isolation purposes.") \ 3698 \ 3699 product(bool, PerfDataSaveToFile, false, \ 3700 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3701 \ 3702 product(ccstr, PerfDataSaveFile, NULL, \ 3703 "Save PerfData memory to the specified absolute pathname," \ 3704 "%p in the file name if present will be replaced by pid") \ 3705 \ 3706 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3707 "Data sampling interval in milliseconds") \ 3708 \ 3709 develop(bool, PerfTraceDataCreation, false, \ 3710 "Trace creation of Performance Data Entries") \ 3711 \ 3712 develop(bool, PerfTraceMemOps, false, \ 3713 "Trace PerfMemory create/attach/detach calls") \ 3714 \ 3715 product(bool, PerfDisableSharedMem, false, \ 3716 "Store performance data in standard memory") \ 3717 \ 3718 product(intx, PerfDataMemorySize, 32*K, \ 3719 "Size of performance data memory region. Will be rounded " \ 3720 "up to a multiple of the native os page size.") \ 3721 \ 3722 product(intx, PerfMaxStringConstLength, 1024, \ 3723 "Maximum PerfStringConstant string length before truncation") \ 3724 \ 3725 product(bool, PerfAllowAtExitRegistration, false, \ 3726 "Allow registration of atexit() methods") \ 3727 \ 3728 product(bool, PerfBypassFileSystemCheck, false, \ 3729 "Bypass Win32 file system criteria checks (Windows Only)") \ 3730 \ 3731 product(intx, UnguardOnExecutionViolation, 0, \ 3732 "Unguard page and retry on no-execute fault (Win32 only)" \ 3733 "0=off, 1=conservative, 2=aggressive") \ 3734 \ 3735 /* Serviceability Support */ \ 3736 \ 3737 product(bool, ManagementServer, false, \ 3738 "Create JMX Management Server") \ 3739 \ 3740 product(bool, DisableAttachMechanism, false, \ 3741 "Disable mechanism that allows tools to attach to this VM") \ 3742 \ 3743 product(bool, StartAttachListener, false, \ 3744 "Always start Attach Listener at VM startup") \ 3745 \ 3746 manageable(bool, PrintConcurrentLocks, false, \ 3747 "Print java.util.concurrent locks in thread dump") \ 3748 \ 3749 product(bool, TransmitErrorReport, false, \ 3750 "Enable error report transmission on erroneous termination") \ 3751 \ 3752 product(ccstr, ErrorReportServer, NULL, \ 3753 "Override built-in error report server address") \ 3754 \ 3755 /* Shared spaces */ \ 3756 \ 3757 product(bool, UseSharedSpaces, true, \ 3758 "Use shared spaces in the permanent generation") \ 3759 \ 3760 product(bool, RequireSharedSpaces, false, \ 3761 "Require shared spaces in the permanent generation") \ 3762 \ 3763 product(bool, DumpSharedSpaces, false, \ 3764 "Special mode: JVM reads a class list, loads classes, builds " \ 3765 "shared spaces, and dumps the shared spaces to a file to be " \ 3766 "used in future JVM runs.") \ 3767 \ 3768 product(bool, PrintSharedSpaces, false, \ 3769 "Print usage of shared spaces") \ 3770 \ 3771 product(uintx, SharedDummyBlockSize, 512*M, \ 3772 "Size of dummy block used to shift heap addresses (in bytes)") \ 3773 \ 3774 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3775 "Size of read-write space in permanent generation (in bytes)") \ 3776 \ 3777 product(uintx, SharedReadOnlySize, 10*M, \ 3778 "Size of read-only space in permanent generation (in bytes)") \ 3779 \ 3780 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3781 "Size of the shared data area adjacent to the heap (in bytes)") \ 3782 \ 3783 product(uintx, SharedMiscCodeSize, 4*M, \ 3784 "Size of the shared code area adjacent to the heap (in bytes)") \ 3785 \ 3786 diagnostic(bool, SharedOptimizeColdStart, true, \ 3787 "At dump time, order shared objects to achieve better " \ 3788 "cold startup time.") \ 3789 \ 3790 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3791 "Reordering policy for SharedOptimizeColdStart " \ 3792 "0=favor classload-time locality, 1=balanced, " \ 3793 "2=favor runtime locality") \ 3794 \ 3795 diagnostic(bool, SharedSkipVerify, false, \ 3796 "Skip assert() and verify() which page-in unwanted shared " \ 3797 "objects. ") \ 3798 \ 3799 diagnostic(bool, EnableInvokeDynamic, true, \ 3800 "support JSR 292 (method handles, invokedynamic, " \ 3801 "anonymous classes") \ 3802 \ 3803 product(bool, AnonymousClasses, false, \ 3804 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3805 \ 3806 experimental(bool, EnableMethodHandles, false, \ 3807 "support method handles (deprecated)") \ 3808 \ 3809 diagnostic(intx, MethodHandlePushLimit, 3, \ 3810 "number of additional stack slots a method handle may push") \ 3811 \ 3812 diagnostic(bool, PrintMethodHandleStubs, false, \ 3813 "Print generated stub code for method handles") \ 3814 \ 3815 develop(bool, TraceMethodHandles, false, \ 3816 "trace internal method handle operations") \ 3817 \ 3818 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3819 "perform extra checks when constructing method handles") \ 3820 \ 3821 diagnostic(bool, OptimizeMethodHandles, true, \ 3822 "when constructing method handles, try to improve them") \ 3823 \ 3824 develop(bool, StressMethodHandleWalk, false, \ 3825 "Process all method handles with MethodHandleWalk") \ 3826 \ 3827 diagnostic(bool, UseRicochetFrames, true, \ 3828 "use ricochet stack frames for method handle combination, " \ 3829 "if the platform supports them") \ 3830 \ 3831 experimental(bool, TrustFinalNonStaticFields, false, \ 3832 "trust final non-static declarations for constant folding") \ 3833 \ 3834 experimental(bool, AllowInvokeGeneric, false, \ 3835 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3836 "as equivalent methods") \ 3837 \ 3838 develop(bool, TraceInvokeDynamic, false, \ 3839 "trace internal invoke dynamic operations") \ 3840 \ 3841 diagnostic(bool, PauseAtStartup, false, \ 3842 "Causes the VM to pause at startup time and wait for the pause " \ 3843 "file to be removed (default: ./vm.paused.<pid>)") \ 3844 \ 3845 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3846 "The file to create and for whose removal to await when pausing " \ 3847 "at startup. (default: ./vm.paused.<pid>)") \ 3848 \ 3849 diagnostic(bool, PauseAtExit, false, \ 3850 "Pause and wait for keypress on exit if a debugger is attached") \ 3851 \ 3852 product(bool, ExtendedDTraceProbes, false, \ 3853 "Enable performance-impacting dtrace probes") \ 3854 \ 3855 product(bool, DTraceMethodProbes, false, \ 3856 "Enable dtrace probes for method-entry and method-exit") \ 3857 \ 3858 product(bool, DTraceAllocProbes, false, \ 3859 "Enable dtrace probes for object allocation") \ 3860 \ 3861 product(bool, DTraceMonitorProbes, false, \ 3862 "Enable dtrace probes for monitor events") \ 3863 \ 3864 product(bool, RelaxAccessControlCheck, false, \ 3865 "Relax the access control checks in the verifier") \ 3866 \ 3867 diagnostic(bool, PrintDTraceDOF, false, \ 3868 "Print the DTrace DOF passed to the system for JSDT probes") \ 3869 \ 3870 product(uintx, StringTableSize, 1009, \ 3871 "Number of buckets in the interned String table") \ 3872 \ 3873 product(bool, UseVMInterruptibleIO, false, \ 3874 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3875 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3876 " of this flag is true for JDK 6 and earliers") 3877 3878/* 3879 * Macros for factoring of globals 3880 */ 3881 3882// Interface macros 3883#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3884#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3885#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3886#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3887#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3888#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3889#ifdef PRODUCT 3890#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3891#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3892#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3893#else 3894#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3895#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3896#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3897#endif 3898// Special LP64 flags, product only needed for now. 3899#ifdef _LP64 3900#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3901#else 3902#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3903#endif // _LP64 3904 3905// Implementation macros 3906#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3907#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3908#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3909#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3910#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3911#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3912#ifdef PRODUCT 3913#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3914#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3915#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3916#else 3917#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3918#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3919#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3920#endif 3921#ifdef _LP64 3922#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3923#else 3924#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3925#endif // _LP64 3926 3927RUNTIME_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) 3928 3929RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3930 3931// Extensions 3932 3933#include "runtime/globals_ext.hpp" 3934 3935#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3936