globals.hpp revision 8290:382e9e4b3b71
1/* 2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26#define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28#include "utilities/debug.hpp" 29 30// use this for flags that are true per default in the tiered build 31// but false in non-tiered builds, and vice versa 32#ifdef TIERED 33#define trueInTiered true 34#define falseInTiered false 35#else 36#define trueInTiered false 37#define falseInTiered true 38#endif 39 40#ifdef TARGET_ARCH_x86 41# include "globals_x86.hpp" 42#endif 43#ifdef TARGET_ARCH_sparc 44# include "globals_sparc.hpp" 45#endif 46#ifdef TARGET_ARCH_zero 47# include "globals_zero.hpp" 48#endif 49#ifdef TARGET_ARCH_arm 50# include "globals_arm.hpp" 51#endif 52#ifdef TARGET_ARCH_ppc 53# include "globals_ppc.hpp" 54#endif 55#ifdef TARGET_ARCH_aarch64 56# include "globals_aarch64.hpp" 57#endif 58#ifdef TARGET_OS_FAMILY_linux 59# include "globals_linux.hpp" 60#endif 61#ifdef TARGET_OS_FAMILY_solaris 62# include "globals_solaris.hpp" 63#endif 64#ifdef TARGET_OS_FAMILY_windows 65# include "globals_windows.hpp" 66#endif 67#ifdef TARGET_OS_FAMILY_aix 68# include "globals_aix.hpp" 69#endif 70#ifdef TARGET_OS_FAMILY_bsd 71# include "globals_bsd.hpp" 72#endif 73#ifdef TARGET_OS_ARCH_linux_x86 74# include "globals_linux_x86.hpp" 75#endif 76#ifdef TARGET_OS_ARCH_linux_sparc 77# include "globals_linux_sparc.hpp" 78#endif 79#ifdef TARGET_OS_ARCH_linux_zero 80# include "globals_linux_zero.hpp" 81#endif 82#ifdef TARGET_OS_ARCH_solaris_x86 83# include "globals_solaris_x86.hpp" 84#endif 85#ifdef TARGET_OS_ARCH_solaris_sparc 86# include "globals_solaris_sparc.hpp" 87#endif 88#ifdef TARGET_OS_ARCH_windows_x86 89# include "globals_windows_x86.hpp" 90#endif 91#ifdef TARGET_OS_ARCH_linux_arm 92# include "globals_linux_arm.hpp" 93#endif 94#ifdef TARGET_OS_ARCH_linux_ppc 95# include "globals_linux_ppc.hpp" 96#endif 97#ifdef TARGET_OS_ARCH_linux_aarch64 98# include "globals_linux_aarch64.hpp" 99#endif 100#ifdef TARGET_OS_ARCH_aix_ppc 101# include "globals_aix_ppc.hpp" 102#endif 103#ifdef TARGET_OS_ARCH_bsd_x86 104# include "globals_bsd_x86.hpp" 105#endif 106#ifdef TARGET_OS_ARCH_bsd_zero 107# include "globals_bsd_zero.hpp" 108#endif 109#ifdef COMPILER1 110#ifdef TARGET_ARCH_x86 111# include "c1_globals_x86.hpp" 112#endif 113#ifdef TARGET_ARCH_sparc 114# include "c1_globals_sparc.hpp" 115#endif 116#ifdef TARGET_ARCH_arm 117# include "c1_globals_arm.hpp" 118#endif 119#ifdef TARGET_ARCH_aarch64 120# include "c1_globals_aarch64.hpp" 121#endif 122#ifdef TARGET_OS_FAMILY_linux 123# include "c1_globals_linux.hpp" 124#endif 125#ifdef TARGET_OS_FAMILY_solaris 126# include "c1_globals_solaris.hpp" 127#endif 128#ifdef TARGET_OS_FAMILY_windows 129# include "c1_globals_windows.hpp" 130#endif 131#ifdef TARGET_OS_FAMILY_aix 132# include "c1_globals_aix.hpp" 133#endif 134#ifdef TARGET_OS_FAMILY_bsd 135# include "c1_globals_bsd.hpp" 136#endif 137#ifdef TARGET_ARCH_ppc 138# include "c1_globals_ppc.hpp" 139#endif 140#endif 141#ifdef COMPILER2 142#ifdef TARGET_ARCH_x86 143# include "c2_globals_x86.hpp" 144#endif 145#ifdef TARGET_ARCH_sparc 146# include "c2_globals_sparc.hpp" 147#endif 148#ifdef TARGET_ARCH_arm 149# include "c2_globals_arm.hpp" 150#endif 151#ifdef TARGET_ARCH_ppc 152# include "c2_globals_ppc.hpp" 153#endif 154#ifdef TARGET_ARCH_aarch64 155# include "c2_globals_aarch64.hpp" 156#endif 157#ifdef TARGET_OS_FAMILY_linux 158# include "c2_globals_linux.hpp" 159#endif 160#ifdef TARGET_OS_FAMILY_solaris 161# include "c2_globals_solaris.hpp" 162#endif 163#ifdef TARGET_OS_FAMILY_windows 164# include "c2_globals_windows.hpp" 165#endif 166#ifdef TARGET_OS_FAMILY_aix 167# include "c2_globals_aix.hpp" 168#endif 169#ifdef TARGET_OS_FAMILY_bsd 170# include "c2_globals_bsd.hpp" 171#endif 172#endif 173#ifdef SHARK 174#ifdef TARGET_ARCH_zero 175# include "shark_globals_zero.hpp" 176#endif 177#endif 178 179#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180define_pd_global(bool, BackgroundCompilation, false); 181define_pd_global(bool, UseTLAB, false); 182define_pd_global(bool, CICompileOSR, false); 183define_pd_global(bool, UseTypeProfile, false); 184define_pd_global(bool, UseOnStackReplacement, false); 185define_pd_global(bool, InlineIntrinsics, false); 186define_pd_global(bool, PreferInterpreterNativeStubs, true); 187define_pd_global(bool, ProfileInterpreter, false); 188define_pd_global(bool, ProfileTraps, false); 189define_pd_global(bool, TieredCompilation, false); 190 191define_pd_global(intx, CompileThreshold, 0); 192 193define_pd_global(intx, OnStackReplacePercentage, 0); 194define_pd_global(bool, ResizeTLAB, false); 195define_pd_global(intx, FreqInlineSize, 0); 196define_pd_global(size_t, NewSizeThreadIncrease, 4*K); 197define_pd_global(intx, InlineClassNatives, true); 198define_pd_global(intx, InlineUnsafeOps, true); 199define_pd_global(intx, InitialCodeCacheSize, 160*K); 200define_pd_global(intx, ReservedCodeCacheSize, 32*M); 201define_pd_global(intx, NonProfiledCodeHeapSize, 0); 202define_pd_global(intx, ProfiledCodeHeapSize, 0); 203define_pd_global(intx, NonNMethodCodeHeapSize, 32*M); 204 205define_pd_global(intx, CodeCacheExpansionSize, 32*K); 206define_pd_global(intx, CodeCacheMinBlockLength, 1); 207define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 208define_pd_global(size_t, MetaspaceSize, ScaleForWordSize(4*M)); 209define_pd_global(bool, NeverActAsServerClassMachine, true); 210define_pd_global(uint64_t,MaxRAM, 1ULL*G); 211#define CI_COMPILER_COUNT 0 212#else 213 214#ifdef COMPILER2 215#define CI_COMPILER_COUNT 2 216#else 217#define CI_COMPILER_COUNT 1 218#endif // COMPILER2 219 220#endif // no compilers 221 222// string type aliases used only in this file 223typedef const char* ccstr; 224typedef const char* ccstrlist; // represents string arguments which accumulate 225 226struct Flag { 227 enum Flags { 228 // value origin 229 DEFAULT = 0, 230 COMMAND_LINE = 1, 231 ENVIRON_VAR = 2, 232 CONFIG_FILE = 3, 233 MANAGEMENT = 4, 234 ERGONOMIC = 5, 235 ATTACH_ON_DEMAND = 6, 236 INTERNAL = 7, 237 238 LAST_VALUE_ORIGIN = INTERNAL, 239 VALUE_ORIGIN_BITS = 4, 240 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 241 242 // flag kind 243 KIND_PRODUCT = 1 << 4, 244 KIND_MANAGEABLE = 1 << 5, 245 KIND_DIAGNOSTIC = 1 << 6, 246 KIND_EXPERIMENTAL = 1 << 7, 247 KIND_NOT_PRODUCT = 1 << 8, 248 KIND_DEVELOP = 1 << 9, 249 KIND_PLATFORM_DEPENDENT = 1 << 10, 250 KIND_READ_WRITE = 1 << 11, 251 KIND_C1 = 1 << 12, 252 KIND_C2 = 1 << 13, 253 KIND_ARCH = 1 << 14, 254 KIND_SHARK = 1 << 15, 255 KIND_LP64_PRODUCT = 1 << 16, 256 KIND_COMMERCIAL = 1 << 17, 257 258 KIND_MASK = ~VALUE_ORIGIN_MASK 259 }; 260 261 const char* _type; 262 const char* _name; 263 void* _addr; 264 NOT_PRODUCT(const char* _doc;) 265 Flags _flags; 266 267 // points to all Flags static array 268 static Flag* flags; 269 270 // number of flags 271 static size_t numFlags; 272 273 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 274 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 275 276 void check_writable(); 277 278 bool is_bool() const; 279 bool get_bool() const; 280 void set_bool(bool value); 281 282 bool is_intx() const; 283 intx get_intx() const; 284 void set_intx(intx value); 285 286 bool is_uintx() const; 287 uintx get_uintx() const; 288 void set_uintx(uintx value); 289 290 bool is_uint64_t() const; 291 uint64_t get_uint64_t() const; 292 void set_uint64_t(uint64_t value); 293 294 bool is_size_t() const; 295 size_t get_size_t() const; 296 void set_size_t(size_t value); 297 298 bool is_double() const; 299 double get_double() const; 300 void set_double(double value); 301 302 bool is_ccstr() const; 303 bool ccstr_accumulates() const; 304 ccstr get_ccstr() const; 305 void set_ccstr(ccstr value); 306 307 Flags get_origin(); 308 void set_origin(Flags origin); 309 310 bool is_default(); 311 bool is_ergonomic(); 312 bool is_command_line(); 313 314 bool is_product() const; 315 bool is_manageable() const; 316 bool is_diagnostic() const; 317 bool is_experimental() const; 318 bool is_notproduct() const; 319 bool is_develop() const; 320 bool is_read_write() const; 321 bool is_commercial() const; 322 323 bool is_constant_in_binary() const; 324 325 bool is_unlocker() const; 326 bool is_unlocked() const; 327 bool is_writeable() const; 328 bool is_external() const; 329 330 bool is_unlocker_ext() const; 331 bool is_unlocked_ext() const; 332 bool is_writeable_ext() const; 333 bool is_external_ext() const; 334 335 void unlock_diagnostic(); 336 337 void get_locked_message(char*, int) const; 338 void get_locked_message_ext(char*, int) const; 339 340 void print_on(outputStream* st, bool withComments = false ); 341 void print_kind(outputStream* st); 342 void print_as_flag(outputStream* st); 343}; 344 345// debug flags control various aspects of the VM and are global accessible 346 347// use FlagSetting to temporarily change some debug flag 348// e.g. FlagSetting fs(DebugThisAndThat, true); 349// restored to previous value upon leaving scope 350class FlagSetting { 351 bool val; 352 bool* flag; 353 public: 354 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 355 ~FlagSetting() { *flag = val; } 356}; 357 358 359class CounterSetting { 360 intx* counter; 361 public: 362 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 363 ~CounterSetting() { (*counter)--; } 364}; 365 366 367class UIntFlagSetting { 368 uintx val; 369 uintx* flag; 370 public: 371 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 372 ~UIntFlagSetting() { *flag = val; } 373}; 374 375class DoubleFlagSetting { 376 double val; 377 double* flag; 378 public: 379 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 380 ~DoubleFlagSetting() { *flag = val; } 381}; 382 383class SizeTFlagSetting { 384 size_t val; 385 size_t* flag; 386 public: 387 SizeTFlagSetting(size_t& fl, size_t newValue) { flag = &fl; val = fl; fl = newValue; } 388 ~SizeTFlagSetting() { *flag = val; } 389}; 390 391 392class CommandLineFlags { 393 public: 394 static bool boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 395 static bool boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 396 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 397 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 398 399 static bool intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 400 static bool intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 401 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 402 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 403 404 static bool uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 405 static bool uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 406 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 407 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 408 409 static bool size_tAt(const char* name, size_t len, size_t* value, bool allow_locked = false, bool return_flag = false); 410 static bool size_tAt(const char* name, size_t* value, bool allow_locked = false, bool return_flag = false) { return size_tAt(name, strlen(name), value, allow_locked, return_flag); } 411 static bool size_tAtPut(const char* name, size_t len, size_t* value, Flag::Flags origin); 412 static bool size_tAtPut(const char* name, size_t* value, Flag::Flags origin) { return size_tAtPut(name, strlen(name), value, origin); } 413 414 static bool uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 415 static bool uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 416 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 417 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 418 419 static bool doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 420 static bool doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 421 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 422 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 423 424 static bool ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 425 static bool ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 426 // Contract: Flag will make private copy of the incoming value. 427 // Outgoing value is always malloc-ed, and caller MUST call free. 428 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 429 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 430 431 // Returns false if name is not a command line flag. 432 static bool wasSetOnCmdline(const char* name, bool* value); 433 static void printSetFlags(outputStream* out); 434 435 static void printFlags(outputStream* out, bool withComments); 436 437 static void verify() PRODUCT_RETURN; 438}; 439 440// use this for flags that are true by default in the debug version but 441// false in the optimized version, and vice versa 442#ifdef ASSERT 443#define trueInDebug true 444#define falseInDebug false 445#else 446#define trueInDebug false 447#define falseInDebug true 448#endif 449 450// use this for flags that are true per default in the product build 451// but false in development builds, and vice versa 452#ifdef PRODUCT 453#define trueInProduct true 454#define falseInProduct false 455#else 456#define trueInProduct false 457#define falseInProduct true 458#endif 459 460#ifdef JAVASE_EMBEDDED 461#define falseInEmbedded false 462#else 463#define falseInEmbedded true 464#endif 465 466// develop flags are settable / visible only during development and are constant in the PRODUCT version 467// product flags are always settable / visible 468// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 469 470// A flag must be declared with one of the following types: 471// bool, intx, uintx, size_t, ccstr, double, or uint64_t. 472// The type "ccstr" is an alias for "const char*" and is used 473// only in this file, because the macrology requires single-token type names. 474 475// Note: Diagnostic options not meant for VM tuning or for product modes. 476// They are to be used for VM quality assurance or field diagnosis 477// of VM bugs. They are hidden so that users will not be encouraged to 478// try them as if they were VM ordinary execution options. However, they 479// are available in the product version of the VM. Under instruction 480// from support engineers, VM customers can turn them on to collect 481// diagnostic information about VM problems. To use a VM diagnostic 482// option, you must first specify +UnlockDiagnosticVMOptions. 483// (This master switch also affects the behavior of -Xprintflags.) 484// 485// experimental flags are in support of features that are not 486// part of the officially supported product, but are available 487// for experimenting with. They could, for example, be performance 488// features that may not have undergone full or rigorous QA, but which may 489// help performance in some cases and released for experimentation 490// by the community of users and developers. This flag also allows one to 491// be able to build a fully supported product that nonetheless also 492// ships with some unsupported, lightly tested, experimental features. 493// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 494// UnlockExperimentalVMOptions flag, which allows the control and 495// modification of the experimental flags. 496// 497// Nota bene: neither diagnostic nor experimental options should be used casually, 498// and they are not supported on production loads, except under explicit 499// direction from support engineers. 500// 501// manageable flags are writeable external product flags. 502// They are dynamically writeable through the JDK management interface 503// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 504// These flags are external exported interface (see CCC). The list of 505// manageable flags can be queried programmatically through the management 506// interface. 507// 508// A flag can be made as "manageable" only if 509// - the flag is defined in a CCC as an external exported interface. 510// - the VM implementation supports dynamic setting of the flag. 511// This implies that the VM must *always* query the flag variable 512// and not reuse state related to the flag state at any given time. 513// - you want the flag to be queried programmatically by the customers. 514// 515// product_rw flags are writeable internal product flags. 516// They are like "manageable" flags but for internal/private use. 517// The list of product_rw flags are internal/private flags which 518// may be changed/removed in a future release. It can be set 519// through the management interface to get/set value 520// when the name of flag is supplied. 521// 522// A flag can be made as "product_rw" only if 523// - the VM implementation supports dynamic setting of the flag. 524// This implies that the VM must *always* query the flag variable 525// and not reuse state related to the flag state at any given time. 526// 527// Note that when there is a need to support develop flags to be writeable, 528// it can be done in the same way as product_rw. 529 530#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 531 \ 532 lp64_product(bool, UseCompressedOops, false, \ 533 "Use 32-bit object references in 64-bit VM. " \ 534 "lp64_product means flag is always constant in 32 bit VM") \ 535 \ 536 lp64_product(bool, UseCompressedClassPointers, false, \ 537 "Use 32-bit class pointers in 64-bit VM. " \ 538 "lp64_product means flag is always constant in 32 bit VM") \ 539 \ 540 notproduct(bool, CheckCompressedOops, true, \ 541 "Generate checks in encoding/decoding code in debug VM") \ 542 \ 543 product_pd(size_t, HeapBaseMinAddress, \ 544 "OS specific low limit for heap base address") \ 545 \ 546 product(uintx, HeapSearchSteps, 3 PPC64_ONLY(+17), \ 547 "Heap allocation steps through preferred address regions to find" \ 548 " where it can allocate the heap. Number of steps to take per " \ 549 "region.") \ 550 \ 551 diagnostic(bool, PrintCompressedOopsMode, false, \ 552 "Print compressed oops base address and encoding mode") \ 553 \ 554 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 555 "Default object alignment in bytes, 8 is minimum") \ 556 \ 557 product(bool, AssumeMP, false, \ 558 "Instruct the VM to assume multiple processors are available") \ 559 \ 560 /* UseMembar is theoretically a temp flag used for memory barrier \ 561 * removal testing. It was supposed to be removed before FCS but has \ 562 * been re-added (see 6401008) */ \ 563 product_pd(bool, UseMembar, \ 564 "(Unstable) Issues membars on thread state transitions") \ 565 \ 566 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 567 "Clean the chunk pool asynchronously") \ 568 \ 569 experimental(bool, AlwaysSafeConstructors, false, \ 570 "Force safe construction, as if all fields are final.") \ 571 \ 572 /* Temporary: See 6948537 */ \ 573 experimental(bool, UseMemSetInBOT, true, \ 574 "(Unstable) uses memset in BOT updates in GC code") \ 575 \ 576 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 577 "Enable normal processing of flags relating to field diagnostics")\ 578 \ 579 experimental(bool, UnlockExperimentalVMOptions, false, \ 580 "Enable normal processing of flags relating to experimental " \ 581 "features") \ 582 \ 583 product(bool, JavaMonitorsInStackTrace, true, \ 584 "Print information about Java monitor locks when the stacks are" \ 585 "dumped") \ 586 \ 587 product_pd(bool, UseLargePages, \ 588 "Use large page memory") \ 589 \ 590 product_pd(bool, UseLargePagesIndividualAllocation, \ 591 "Allocate large pages individually for better affinity") \ 592 \ 593 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 594 "Fail large pages individual allocation") \ 595 \ 596 product(bool, UseLargePagesInMetaspace, false, \ 597 "Use large page memory in metaspace. " \ 598 "Only used if UseLargePages is enabled.") \ 599 \ 600 develop(bool, TracePageSizes, false, \ 601 "Trace page size selection and usage") \ 602 \ 603 product(bool, UseNUMA, false, \ 604 "Use NUMA if available") \ 605 \ 606 product(bool, UseNUMAInterleaving, false, \ 607 "Interleave memory across NUMA nodes if available") \ 608 \ 609 product(size_t, NUMAInterleaveGranularity, 2*M, \ 610 "Granularity to use for NUMA interleaving on Windows OS") \ 611 \ 612 product(bool, ForceNUMA, false, \ 613 "Force NUMA optimizations on single-node/UMA systems") \ 614 \ 615 product(uintx, NUMAChunkResizeWeight, 20, \ 616 "Percentage (0-100) used to weight the current sample when " \ 617 "computing exponentially decaying average for " \ 618 "AdaptiveNUMAChunkSizing") \ 619 \ 620 product(size_t, NUMASpaceResizeRate, 1*G, \ 621 "Do not reallocate more than this amount per collection") \ 622 \ 623 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 624 "Enable adaptive chunk sizing for NUMA") \ 625 \ 626 product(bool, NUMAStats, false, \ 627 "Print NUMA stats in detailed heap information") \ 628 \ 629 product(uintx, NUMAPageScanRate, 256, \ 630 "Maximum number of pages to include in the page scan procedure") \ 631 \ 632 product_pd(bool, NeedsDeoptSuspend, \ 633 "True for register window machines (sparc/ia64)") \ 634 \ 635 product(intx, UseSSE, 99, \ 636 "Highest supported SSE instructions set on x86/x64") \ 637 \ 638 product(bool, UseAES, false, \ 639 "Control whether AES instructions can be used on x86/x64") \ 640 \ 641 product(bool, UseSHA, false, \ 642 "Control whether SHA instructions can be used on SPARC") \ 643 \ 644 product(size_t, LargePageSizeInBytes, 0, \ 645 "Large page size (0 to let VM choose the page size)") \ 646 \ 647 product(size_t, LargePageHeapSizeThreshold, 128*M, \ 648 "Use large pages if maximum heap is at least this big") \ 649 \ 650 product(bool, ForceTimeHighResolution, false, \ 651 "Using high time resolution (for Win32 only)") \ 652 \ 653 develop(bool, TraceItables, false, \ 654 "Trace initialization and use of itables") \ 655 \ 656 develop(bool, TracePcPatching, false, \ 657 "Trace usage of frame::patch_pc") \ 658 \ 659 develop(bool, TraceJumps, false, \ 660 "Trace assembly jumps in thread ring buffer") \ 661 \ 662 develop(bool, TraceRelocator, false, \ 663 "Trace the bytecode relocator") \ 664 \ 665 develop(bool, TraceLongCompiles, false, \ 666 "Print out every time compilation is longer than " \ 667 "a given threshold") \ 668 \ 669 develop(bool, SafepointALot, false, \ 670 "Generate a lot of safepoints. This works with " \ 671 "GuaranteedSafepointInterval") \ 672 \ 673 product_pd(bool, BackgroundCompilation, \ 674 "A thread requesting compilation is not blocked during " \ 675 "compilation") \ 676 \ 677 product(bool, PrintVMQWaitTime, false, \ 678 "Print out the waiting time in VM operation queue") \ 679 \ 680 develop(bool, NoYieldsInMicrolock, false, \ 681 "Disable yields in microlock") \ 682 \ 683 develop(bool, TraceOopMapGeneration, false, \ 684 "Show OopMapGeneration") \ 685 \ 686 product(bool, MethodFlushing, true, \ 687 "Reclamation of zombie and not-entrant methods") \ 688 \ 689 develop(bool, VerifyStack, false, \ 690 "Verify stack of each thread when it is entering a runtime call") \ 691 \ 692 diagnostic(bool, ForceUnreachable, false, \ 693 "Make all non code cache addresses to be unreachable by " \ 694 "forcing use of 64bit literal fixups") \ 695 \ 696 notproduct(bool, StressDerivedPointers, false, \ 697 "Force scavenge when a derived pointer is detected on stack " \ 698 "after rtm call") \ 699 \ 700 develop(bool, TraceDerivedPointers, false, \ 701 "Trace traversal of derived pointers on stack") \ 702 \ 703 notproduct(bool, TraceCodeBlobStacks, false, \ 704 "Trace stack-walk of codeblobs") \ 705 \ 706 product(bool, PrintJNIResolving, false, \ 707 "Used to implement -v:jni") \ 708 \ 709 notproduct(bool, PrintRewrites, false, \ 710 "Print methods that are being rewritten") \ 711 \ 712 product(bool, UseInlineCaches, true, \ 713 "Use Inline Caches for virtual calls ") \ 714 \ 715 develop(bool, InlineArrayCopy, true, \ 716 "Inline arraycopy native that is known to be part of " \ 717 "base library DLL") \ 718 \ 719 develop(bool, InlineObjectHash, true, \ 720 "Inline Object::hashCode() native that is known to be part " \ 721 "of base library DLL") \ 722 \ 723 develop(bool, InlineNatives, true, \ 724 "Inline natives that are known to be part of base library DLL") \ 725 \ 726 develop(bool, InlineMathNatives, true, \ 727 "Inline SinD, CosD, etc.") \ 728 \ 729 develop(bool, InlineClassNatives, true, \ 730 "Inline Class.isInstance, etc") \ 731 \ 732 develop(bool, InlineThreadNatives, true, \ 733 "Inline Thread.currentThread, etc") \ 734 \ 735 develop(bool, InlineUnsafeOps, true, \ 736 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 737 \ 738 product(bool, CriticalJNINatives, true, \ 739 "Check for critical JNI entry points") \ 740 \ 741 notproduct(bool, StressCriticalJNINatives, false, \ 742 "Exercise register saving code in critical natives") \ 743 \ 744 product(bool, UseSSE42Intrinsics, false, \ 745 "SSE4.2 versions of intrinsics") \ 746 \ 747 product(bool, UseAESIntrinsics, false, \ 748 "Use intrinsics for AES versions of crypto") \ 749 \ 750 product(bool, UseSHA1Intrinsics, false, \ 751 "Use intrinsics for SHA-1 crypto hash function") \ 752 \ 753 product(bool, UseSHA256Intrinsics, false, \ 754 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 755 \ 756 product(bool, UseSHA512Intrinsics, false, \ 757 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 758 \ 759 product(bool, UseCRC32Intrinsics, false, \ 760 "use intrinsics for java.util.zip.CRC32") \ 761 \ 762 develop(bool, TraceCallFixup, false, \ 763 "Trace all call fixups") \ 764 \ 765 develop(bool, DeoptimizeALot, false, \ 766 "Deoptimize at every exit from the runtime system") \ 767 \ 768 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 769 "A comma separated list of bcis to deoptimize at") \ 770 \ 771 product(bool, DeoptimizeRandom, false, \ 772 "Deoptimize random frames on random exit from the runtime system")\ 773 \ 774 notproduct(bool, ZombieALot, false, \ 775 "Create zombies (non-entrant) at exit from the runtime system") \ 776 \ 777 product(bool, UnlinkSymbolsALot, false, \ 778 "Unlink unreferenced symbols from the symbol table at safepoints")\ 779 \ 780 notproduct(bool, WalkStackALot, false, \ 781 "Trace stack (no print) at every exit from the runtime system") \ 782 \ 783 product(bool, Debugging, false, \ 784 "Set when executing debug methods in debug.cpp " \ 785 "(to prevent triggering assertions)") \ 786 \ 787 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 788 "Enable strict checks that safepoints cannot happen for threads " \ 789 "that use No_Safepoint_Verifier") \ 790 \ 791 notproduct(bool, VerifyLastFrame, false, \ 792 "Verify oops on last frame on entry to VM") \ 793 \ 794 develop(bool, TraceHandleAllocation, false, \ 795 "Print out warnings when suspiciously many handles are allocated")\ 796 \ 797 product(bool, FailOverToOldVerifier, true, \ 798 "Fail over to old verifier when split verifier fails") \ 799 \ 800 develop(bool, ShowSafepointMsgs, false, \ 801 "Show message about safepoint synchronization") \ 802 \ 803 product(bool, SafepointTimeout, false, \ 804 "Time out and warn or fail after SafepointTimeoutDelay " \ 805 "milliseconds if failed to reach safepoint") \ 806 \ 807 develop(bool, DieOnSafepointTimeout, false, \ 808 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 809 \ 810 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 811 /* typically, at most a few retries are needed */ \ 812 product(intx, SuspendRetryCount, 50, \ 813 "Maximum retry count for an external suspend request") \ 814 \ 815 product(intx, SuspendRetryDelay, 5, \ 816 "Milliseconds to delay per retry (* current_retry_count)") \ 817 \ 818 product(bool, AssertOnSuspendWaitFailure, false, \ 819 "Assert/Guarantee on external suspend wait failure") \ 820 \ 821 product(bool, TraceSuspendWaitFailures, false, \ 822 "Trace external suspend wait failures") \ 823 \ 824 product(bool, MaxFDLimit, true, \ 825 "Bump the number of file descriptors to maximum in Solaris") \ 826 \ 827 diagnostic(bool, LogEvents, true, \ 828 "Enable the various ring buffer event logs") \ 829 \ 830 diagnostic(uintx, LogEventsBufferEntries, 10, \ 831 "Number of ring buffer event logs") \ 832 \ 833 product(bool, BytecodeVerificationRemote, true, \ 834 "Enable the Java bytecode verifier for remote classes") \ 835 \ 836 product(bool, BytecodeVerificationLocal, false, \ 837 "Enable the Java bytecode verifier for local classes") \ 838 \ 839 develop(bool, ForceFloatExceptions, trueInDebug, \ 840 "Force exceptions on FP stack under/overflow") \ 841 \ 842 develop(bool, VerifyStackAtCalls, false, \ 843 "Verify that the stack pointer is unchanged after calls") \ 844 \ 845 develop(bool, TraceJavaAssertions, false, \ 846 "Trace java language assertions") \ 847 \ 848 notproduct(bool, CheckAssertionStatusDirectives, false, \ 849 "Temporary - see javaClasses.cpp") \ 850 \ 851 notproduct(bool, PrintMallocFree, false, \ 852 "Trace calls to C heap malloc/free allocation") \ 853 \ 854 product(bool, PrintOopAddress, false, \ 855 "Always print the location of the oop") \ 856 \ 857 notproduct(bool, VerifyCodeCache, false, \ 858 "Verify code cache on memory allocation/deallocation") \ 859 \ 860 develop(bool, ZapDeadCompiledLocals, false, \ 861 "Zap dead locals in compiler frames") \ 862 \ 863 notproduct(bool, ZapDeadLocalsOld, false, \ 864 "Zap dead locals (old version, zaps all frames when " \ 865 "entering the VM") \ 866 \ 867 notproduct(bool, CheckOopishValues, false, \ 868 "Warn if value contains oop (requires ZapDeadLocals)") \ 869 \ 870 develop(bool, UseMallocOnly, false, \ 871 "Use only malloc/free for allocation (no resource area/arena)") \ 872 \ 873 develop(bool, PrintMalloc, false, \ 874 "Print all malloc/free calls") \ 875 \ 876 develop(bool, PrintMallocStatistics, false, \ 877 "Print malloc/free statistics") \ 878 \ 879 develop(bool, ZapResourceArea, trueInDebug, \ 880 "Zap freed resource/arena space with 0xABABABAB") \ 881 \ 882 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 883 "Zap freed VM handle space with 0xBCBCBCBC") \ 884 \ 885 develop(bool, ZapJNIHandleArea, trueInDebug, \ 886 "Zap freed JNI handle space with 0xFEFEFEFE") \ 887 \ 888 notproduct(bool, ZapStackSegments, trueInDebug, \ 889 "Zap allocated/freed stack segments with 0xFADFADED") \ 890 \ 891 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 892 "Zap unused heap space with 0xBAADBABE") \ 893 \ 894 develop(bool, TraceZapUnusedHeapArea, false, \ 895 "Trace zapping of unused heap space") \ 896 \ 897 develop(bool, CheckZapUnusedHeapArea, false, \ 898 "Check zapping of unused heap space") \ 899 \ 900 develop(bool, ZapFillerObjects, trueInDebug, \ 901 "Zap filler objects with 0xDEAFBABE") \ 902 \ 903 develop(bool, PrintVMMessages, true, \ 904 "Print VM messages on console") \ 905 \ 906 product(bool, PrintGCApplicationConcurrentTime, false, \ 907 "Print the time the application has been running") \ 908 \ 909 product(bool, PrintGCApplicationStoppedTime, false, \ 910 "Print the time the application has been stopped") \ 911 \ 912 diagnostic(bool, VerboseVerification, false, \ 913 "Display detailed verification details") \ 914 \ 915 notproduct(uintx, ErrorHandlerTest, 0, \ 916 "If > 0, provokes an error after VM initialization; the value " \ 917 "determines which error to provoke. See test_error_handler() " \ 918 "in debug.cpp.") \ 919 \ 920 notproduct(uintx, TestCrashInErrorHandler, 0, \ 921 "If > 0, provokes an error inside VM error handler (a secondary " \ 922 "crash). see test_error_handler() in debug.cpp.") \ 923 \ 924 notproduct(bool, TestSafeFetchInErrorHandler, false, \ 925 "If true, tests SafeFetch inside error handler.") \ 926 \ 927 develop(bool, Verbose, false, \ 928 "Print additional debugging information from other modes") \ 929 \ 930 develop(bool, PrintMiscellaneous, false, \ 931 "Print uncategorized debugging information (requires +Verbose)") \ 932 \ 933 develop(bool, WizardMode, false, \ 934 "Print much more debugging information") \ 935 \ 936 product(bool, ShowMessageBoxOnError, false, \ 937 "Keep process alive on VM fatal error") \ 938 \ 939 product(bool, CreateMinidumpOnCrash, false, \ 940 "Create minidump on VM fatal error") \ 941 \ 942 product_pd(bool, UseOSErrorReporting, \ 943 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 944 \ 945 product(bool, SuppressFatalErrorMessage, false, \ 946 "Report NO fatal error message (avoid deadlock)") \ 947 \ 948 product(ccstrlist, OnError, "", \ 949 "Run user-defined commands on fatal error; see VMError.cpp " \ 950 "for examples") \ 951 \ 952 product(ccstrlist, OnOutOfMemoryError, "", \ 953 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 954 \ 955 manageable(bool, HeapDumpBeforeFullGC, false, \ 956 "Dump heap to file before any major stop-the-world GC") \ 957 \ 958 manageable(bool, HeapDumpAfterFullGC, false, \ 959 "Dump heap to file after any major stop-the-world GC") \ 960 \ 961 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 962 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 963 \ 964 manageable(ccstr, HeapDumpPath, NULL, \ 965 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 966 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 967 "in the working directory)") \ 968 \ 969 develop(size_t, SegmentedHeapDumpThreshold, 2*G, \ 970 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 971 "when the heap usage is larger than this") \ 972 \ 973 develop(size_t, HeapDumpSegmentSize, 1*G, \ 974 "Approximate segment size when generating a segmented heap dump") \ 975 \ 976 develop(bool, BreakAtWarning, false, \ 977 "Execute breakpoint upon encountering VM warning") \ 978 \ 979 develop(bool, TraceVMOperation, false, \ 980 "Trace VM operations") \ 981 \ 982 develop(bool, UseFakeTimers, false, \ 983 "Tell whether the VM should use system time or a fake timer") \ 984 \ 985 product(ccstr, NativeMemoryTracking, "off", \ 986 "Native memory tracking options") \ 987 \ 988 diagnostic(bool, PrintNMTStatistics, false, \ 989 "Print native memory tracking summary data if it is on") \ 990 \ 991 diagnostic(bool, LogCompilation, false, \ 992 "Log compilation activity in detail to LogFile") \ 993 \ 994 product(bool, PrintCompilation, false, \ 995 "Print compilations") \ 996 \ 997 diagnostic(bool, TraceNMethodInstalls, false, \ 998 "Trace nmethod installation") \ 999 \ 1000 diagnostic(intx, ScavengeRootsInCode, 2, \ 1001 "0: do not allow scavengable oops in the code cache; " \ 1002 "1: allow scavenging from the code cache; " \ 1003 "2: emit as many constants as the compiler can see") \ 1004 \ 1005 product(bool, AlwaysRestoreFPU, false, \ 1006 "Restore the FPU control word after every JNI call (expensive)") \ 1007 \ 1008 diagnostic(bool, PrintCompilation2, false, \ 1009 "Print additional statistics per compilation") \ 1010 \ 1011 diagnostic(bool, PrintAdapterHandlers, false, \ 1012 "Print code generated for i2c/c2i adapters") \ 1013 \ 1014 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 1015 "Verify that i2c/c2i adapters are called properly") \ 1016 \ 1017 develop(bool, VerifyAdapterSharing, false, \ 1018 "Verify that the code for shared adapters is the equivalent") \ 1019 \ 1020 diagnostic(bool, PrintAssembly, false, \ 1021 "Print assembly code (using external disassembler.so)") \ 1022 \ 1023 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 1024 "Print options string passed to disassembler.so") \ 1025 \ 1026 diagnostic(bool, PrintNMethods, false, \ 1027 "Print assembly code for nmethods when generated") \ 1028 \ 1029 diagnostic(bool, PrintNativeNMethods, false, \ 1030 "Print assembly code for native nmethods when generated") \ 1031 \ 1032 develop(bool, PrintDebugInfo, false, \ 1033 "Print debug information for all nmethods when generated") \ 1034 \ 1035 develop(bool, PrintRelocations, false, \ 1036 "Print relocation information for all nmethods when generated") \ 1037 \ 1038 develop(bool, PrintDependencies, false, \ 1039 "Print dependency information for all nmethods when generated") \ 1040 \ 1041 develop(bool, PrintExceptionHandlers, false, \ 1042 "Print exception handler tables for all nmethods when generated") \ 1043 \ 1044 develop(bool, StressCompiledExceptionHandlers, false, \ 1045 "Exercise compiled exception handlers") \ 1046 \ 1047 develop(bool, InterceptOSException, false, \ 1048 "Start debugger when an implicit OS (e.g. NULL) " \ 1049 "exception happens") \ 1050 \ 1051 product(bool, PrintCodeCache, false, \ 1052 "Print the code cache memory usage when exiting") \ 1053 \ 1054 develop(bool, PrintCodeCache2, false, \ 1055 "Print detailed usage information on the code cache when exiting")\ 1056 \ 1057 product(bool, PrintCodeCacheOnCompilation, false, \ 1058 "Print the code cache memory usage each time a method is " \ 1059 "compiled") \ 1060 \ 1061 diagnostic(bool, PrintStubCode, false, \ 1062 "Print generated stub code") \ 1063 \ 1064 product(bool, StackTraceInThrowable, true, \ 1065 "Collect backtrace in throwable when exception happens") \ 1066 \ 1067 product(bool, OmitStackTraceInFastThrow, true, \ 1068 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1069 \ 1070 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1071 "Print bytecode statistics when dumping profiler output") \ 1072 \ 1073 product(bool, ProfilerRecordPC, false, \ 1074 "Collect ticks for each 16 byte interval of compiled code") \ 1075 \ 1076 product(bool, ProfileVM, false, \ 1077 "Profile ticks that fall within VM (either in the VM Thread " \ 1078 "or VM code called through stubs)") \ 1079 \ 1080 product(bool, ProfileIntervals, false, \ 1081 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1082 \ 1083 notproduct(bool, ProfilerCheckIntervals, false, \ 1084 "Collect and print information on spacing of profiler ticks") \ 1085 \ 1086 product(bool, PrintWarnings, true, \ 1087 "Print JVM warnings to output stream") \ 1088 \ 1089 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1090 "Print warnings for stalled SpinLocks") \ 1091 \ 1092 product(bool, RegisterFinalizersAtInit, true, \ 1093 "Register finalizable objects at end of Object.<init> or " \ 1094 "after allocation") \ 1095 \ 1096 develop(bool, RegisterReferences, true, \ 1097 "Tell whether the VM should register soft/weak/final/phantom " \ 1098 "references") \ 1099 \ 1100 develop(bool, IgnoreRewrites, false, \ 1101 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1102 "This is unsafe!") \ 1103 \ 1104 develop(bool, PrintCodeCacheExtension, false, \ 1105 "Print extension of code cache") \ 1106 \ 1107 develop(bool, UsePrivilegedStack, true, \ 1108 "Enable the security JVM functions") \ 1109 \ 1110 develop(bool, ProtectionDomainVerification, true, \ 1111 "Verify protection domain before resolution in system dictionary")\ 1112 \ 1113 product(bool, ClassUnloading, true, \ 1114 "Do unloading of classes") \ 1115 \ 1116 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1117 "Do unloading of classes with a concurrent marking cycle") \ 1118 \ 1119 develop(bool, DisableStartThread, false, \ 1120 "Disable starting of additional Java threads " \ 1121 "(for debugging only)") \ 1122 \ 1123 develop(bool, MemProfiling, false, \ 1124 "Write memory usage profiling to log file") \ 1125 \ 1126 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1127 "Print the system dictionary at exit") \ 1128 \ 1129 experimental(intx, PredictedLoadedClassCount, 0, \ 1130 "Experimental: Tune loaded class cache starting size") \ 1131 \ 1132 diagnostic(bool, UnsyncloadClass, false, \ 1133 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1134 "class loader must call VM synchronized for findClass " \ 1135 "and defineClass.") \ 1136 \ 1137 product(bool, AlwaysLockClassLoader, false, \ 1138 "Require the VM to acquire the class loader lock before calling " \ 1139 "loadClass() even for class loaders registering " \ 1140 "as parallel capable") \ 1141 \ 1142 product(bool, AllowParallelDefineClass, false, \ 1143 "Allow parallel defineClass requests for class loaders " \ 1144 "registering as parallel capable") \ 1145 \ 1146 product(bool, MustCallLoadClassInternal, false, \ 1147 "Call loadClassInternal() rather than loadClass()") \ 1148 \ 1149 product_pd(bool, DontYieldALot, \ 1150 "Throw away obvious excess yield calls") \ 1151 \ 1152 product_pd(bool, ConvertSleepToYield, \ 1153 "Convert sleep(0) to thread yield " \ 1154 "(may be off for Solaris to improve GUI)") \ 1155 \ 1156 product(bool, ConvertYieldToSleep, false, \ 1157 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1158 "behavior") \ 1159 \ 1160 product(bool, UseBoundThreads, true, \ 1161 "Bind user level threads to kernel threads (for Solaris only)") \ 1162 \ 1163 develop(bool, UseDetachedThreads, true, \ 1164 "Use detached threads that are recycled upon termination " \ 1165 "(for Solaris only)") \ 1166 \ 1167 product(bool, UseLWPSynchronization, true, \ 1168 "Use LWP-based instead of libthread-based synchronization " \ 1169 "(SPARC only)") \ 1170 \ 1171 experimental(ccstr, SyncKnobs, NULL, \ 1172 "(Unstable) Various monitor synchronization tunables") \ 1173 \ 1174 experimental(intx, EmitSync, 0, \ 1175 "(Unsafe, Unstable) " \ 1176 "Control emission of inline sync fast-path code") \ 1177 \ 1178 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1179 \ 1180 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1181 \ 1182 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1183 "Experimental Sync flags") \ 1184 \ 1185 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1186 \ 1187 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1188 \ 1189 experimental(intx, hashCode, 5, \ 1190 "(Unstable) select hashCode generation algorithm") \ 1191 \ 1192 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1193 "(Unstable, Linux-specific) " \ 1194 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1195 \ 1196 product(bool, FilterSpuriousWakeups, true, \ 1197 "When true prevents OS-level spurious, or premature, wakeups " \ 1198 "from Object.wait (Ignored for Windows)") \ 1199 \ 1200 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1201 \ 1202 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1203 \ 1204 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1205 \ 1206 develop(bool, UsePthreads, false, \ 1207 "Use pthread-based instead of libthread-based synchronization " \ 1208 "(SPARC only)") \ 1209 \ 1210 product(bool, ReduceSignalUsage, false, \ 1211 "Reduce the use of OS signals in Java and/or the VM") \ 1212 \ 1213 develop_pd(bool, ShareVtableStubs, \ 1214 "Share vtable stubs (smaller code but worse branch prediction") \ 1215 \ 1216 develop(bool, LoadLineNumberTables, true, \ 1217 "Tell whether the class file parser loads line number tables") \ 1218 \ 1219 develop(bool, LoadLocalVariableTables, true, \ 1220 "Tell whether the class file parser loads local variable tables") \ 1221 \ 1222 develop(bool, LoadLocalVariableTypeTables, true, \ 1223 "Tell whether the class file parser loads local variable type" \ 1224 "tables") \ 1225 \ 1226 product(bool, AllowUserSignalHandlers, false, \ 1227 "Do not complain if the application installs signal handlers " \ 1228 "(Solaris & Linux only)") \ 1229 \ 1230 product(bool, UseSignalChaining, true, \ 1231 "Use signal-chaining to invoke signal handlers installed " \ 1232 "by the application (Solaris & Linux only)") \ 1233 \ 1234 product(bool, UseAltSigs, false, \ 1235 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1236 "internal signals (Solaris only)") \ 1237 \ 1238 product(bool, AllowJNIEnvProxy, false, \ 1239 "Allow JNIEnv proxies for jdbx") \ 1240 \ 1241 product(bool, JNIDetachReleasesMonitors, true, \ 1242 "JNI DetachCurrentThread releases monitors owned by thread") \ 1243 \ 1244 product(bool, RestoreMXCSROnJNICalls, false, \ 1245 "Restore MXCSR when returning from JNI calls") \ 1246 \ 1247 product(bool, CheckJNICalls, false, \ 1248 "Verify all arguments to JNI calls") \ 1249 \ 1250 product(bool, CheckEndorsedAndExtDirs, false, \ 1251 "Verify the endorsed and extension directories are not used") \ 1252 \ 1253 product(bool, UseFastJNIAccessors, true, \ 1254 "Use optimized versions of Get<Primitive>Field") \ 1255 \ 1256 product(intx, MaxJNILocalCapacity, 65536, \ 1257 "Maximum allowable local JNI handle capacity to " \ 1258 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1259 "where <= 0 is unlimited, default: 65536") \ 1260 \ 1261 product(bool, EagerXrunInit, false, \ 1262 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1263 "but not all -Xrun libraries may support the state of the VM " \ 1264 "at this time") \ 1265 \ 1266 product(bool, PreserveAllAnnotations, false, \ 1267 "Preserve RuntimeInvisibleAnnotations as well " \ 1268 "as RuntimeVisibleAnnotations") \ 1269 \ 1270 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1271 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1272 \ 1273 product(bool, LazyBootClassLoader, true, \ 1274 "Enable/disable lazy opening of boot class path entries") \ 1275 \ 1276 product(bool, UseXMMForArrayCopy, false, \ 1277 "Use SSE2 MOVQ instruction for Arraycopy") \ 1278 \ 1279 product(intx, FieldsAllocationStyle, 1, \ 1280 "0 - type based with oops first, 1 - with oops last, " \ 1281 "2 - oops in super and sub classes are together") \ 1282 \ 1283 product(bool, CompactFields, true, \ 1284 "Allocate nonstatic fields in gaps between previous fields") \ 1285 \ 1286 notproduct(bool, PrintFieldLayout, false, \ 1287 "Print field layout for each class") \ 1288 \ 1289 product(intx, ContendedPaddingWidth, 128, \ 1290 "How many bytes to pad the fields/classes marked @Contended with")\ 1291 \ 1292 product(bool, EnableContended, true, \ 1293 "Enable @Contended annotation support") \ 1294 \ 1295 product(bool, RestrictContended, true, \ 1296 "Restrict @Contended to trusted classes") \ 1297 \ 1298 product(bool, UseBiasedLocking, true, \ 1299 "Enable biased locking in JVM") \ 1300 \ 1301 product(intx, BiasedLockingStartupDelay, 4000, \ 1302 "Number of milliseconds to wait before enabling biased locking") \ 1303 \ 1304 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1305 "Print statistics of biased locking in JVM") \ 1306 \ 1307 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1308 "Threshold of number of revocations per type to try to " \ 1309 "rebias all objects in the heap of that type") \ 1310 \ 1311 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1312 "Threshold of number of revocations per type to permanently " \ 1313 "revoke biases of all objects in the heap of that type") \ 1314 \ 1315 product(intx, BiasedLockingDecayTime, 25000, \ 1316 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1317 "type after previous bulk rebias") \ 1318 \ 1319 /* tracing */ \ 1320 \ 1321 notproduct(bool, TraceRuntimeCalls, false, \ 1322 "Trace run-time calls") \ 1323 \ 1324 develop(bool, TraceJNICalls, false, \ 1325 "Trace JNI calls") \ 1326 \ 1327 develop(bool, StressRewriter, false, \ 1328 "Stress linktime bytecode rewriting") \ 1329 \ 1330 notproduct(bool, TraceJVMCalls, false, \ 1331 "Trace JVM calls") \ 1332 \ 1333 product(ccstr, TraceJVMTI, NULL, \ 1334 "Trace flags for JVMTI functions and events") \ 1335 \ 1336 /* This option can change an EMCP method into an obsolete method. */ \ 1337 /* This can affect tests that except specific methods to be EMCP. */ \ 1338 /* This option should be used with caution. */ \ 1339 product(bool, StressLdcRewrite, false, \ 1340 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1341 \ 1342 product(intx, TraceRedefineClasses, 0, \ 1343 "Trace level for JVMTI RedefineClasses") \ 1344 \ 1345 develop(bool, StressMethodComparator, false, \ 1346 "Run the MethodComparator on all loaded methods") \ 1347 \ 1348 /* change to false by default sometime after Mustang */ \ 1349 product(bool, VerifyMergedCPBytecodes, true, \ 1350 "Verify bytecodes after RedefineClasses constant pool merging") \ 1351 \ 1352 develop(bool, TraceJNIHandleAllocation, false, \ 1353 "Trace allocation/deallocation of JNI handle blocks") \ 1354 \ 1355 develop(bool, TraceBytecodes, false, \ 1356 "Trace bytecode execution") \ 1357 \ 1358 develop(bool, TraceClassInitialization, false, \ 1359 "Trace class initialization") \ 1360 \ 1361 product(bool, TraceExceptions, false, \ 1362 "Trace exceptions") \ 1363 \ 1364 develop(bool, TraceICs, false, \ 1365 "Trace inline cache changes") \ 1366 \ 1367 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1368 "Trace method invocation counter overflow") \ 1369 \ 1370 develop(bool, TraceInlineCacheClearing, false, \ 1371 "Trace clearing of inline caches in nmethods") \ 1372 \ 1373 develop(bool, TraceDependencies, false, \ 1374 "Trace dependencies") \ 1375 \ 1376 develop(bool, VerifyDependencies, trueInDebug, \ 1377 "Exercise and verify the compilation dependency mechanism") \ 1378 \ 1379 develop(bool, TraceNewOopMapGeneration, false, \ 1380 "Trace OopMapGeneration") \ 1381 \ 1382 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1383 "Trace OopMapGeneration: print detailed cell states") \ 1384 \ 1385 develop(bool, TimeOopMap, false, \ 1386 "Time calls to GenerateOopMap::compute_map() in sum") \ 1387 \ 1388 develop(bool, TimeOopMap2, false, \ 1389 "Time calls to GenerateOopMap::compute_map() individually") \ 1390 \ 1391 develop(bool, TraceMonitorMismatch, false, \ 1392 "Trace monitor matching failures during OopMapGeneration") \ 1393 \ 1394 develop(bool, TraceOopMapRewrites, false, \ 1395 "Trace rewriting of method oops during oop map generation") \ 1396 \ 1397 develop(bool, TraceSafepoint, false, \ 1398 "Trace safepoint operations") \ 1399 \ 1400 develop(bool, TraceICBuffer, false, \ 1401 "Trace usage of IC buffer") \ 1402 \ 1403 develop(bool, TraceCompiledIC, false, \ 1404 "Trace changes of compiled IC") \ 1405 \ 1406 notproduct(bool, TraceZapDeadLocals, false, \ 1407 "Trace zapping dead locals") \ 1408 \ 1409 develop(bool, TraceStartupTime, false, \ 1410 "Trace setup time") \ 1411 \ 1412 develop(bool, TraceProtectionDomainVerification, false, \ 1413 "Trace protection domain verification") \ 1414 \ 1415 develop(bool, TraceClearedExceptions, false, \ 1416 "Print when an exception is forcibly cleared") \ 1417 \ 1418 product(bool, TraceClassResolution, false, \ 1419 "Trace all constant pool resolutions (for debugging)") \ 1420 \ 1421 product(bool, TraceBiasedLocking, false, \ 1422 "Trace biased locking in JVM") \ 1423 \ 1424 product(bool, TraceMonitorInflation, false, \ 1425 "Trace monitor inflation in JVM") \ 1426 \ 1427 /* gc */ \ 1428 \ 1429 product(bool, UseSerialGC, false, \ 1430 "Use the Serial garbage collector") \ 1431 \ 1432 product(bool, UseG1GC, false, \ 1433 "Use the Garbage-First garbage collector") \ 1434 \ 1435 product(bool, UseParallelGC, false, \ 1436 "Use the Parallel Scavenge garbage collector") \ 1437 \ 1438 product(bool, UseParallelOldGC, false, \ 1439 "Use the Parallel Old garbage collector") \ 1440 \ 1441 product(uintx, HeapMaximumCompactionInterval, 20, \ 1442 "How often should we maximally compact the heap (not allowing " \ 1443 "any dead space)") \ 1444 \ 1445 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1446 "The collection count for the first maximum compaction") \ 1447 \ 1448 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1449 "Use maximum compaction in the Parallel Old garbage collector " \ 1450 "for a system GC") \ 1451 \ 1452 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1453 "The mean used by the parallel compact dead wood " \ 1454 "limiter (a number between 0-100)") \ 1455 \ 1456 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1457 "The standard deviation used by the parallel compact dead wood " \ 1458 "limiter (a number between 0-100)") \ 1459 \ 1460 product(uintx, ParallelGCThreads, 0, \ 1461 "Number of parallel threads parallel gc will use") \ 1462 \ 1463 product(bool, UseDynamicNumberOfGCThreads, false, \ 1464 "Dynamically choose the number of parallel threads " \ 1465 "parallel gc will use") \ 1466 \ 1467 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1468 "Force dynamic selection of the number of " \ 1469 "parallel threads parallel gc will use to aid debugging") \ 1470 \ 1471 product(size_t, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1472 "Size of heap (bytes) per GC thread used in calculating the " \ 1473 "number of GC threads") \ 1474 \ 1475 product(bool, TraceDynamicGCThreads, false, \ 1476 "Trace the dynamic GC thread usage") \ 1477 \ 1478 develop(bool, ParallelOldGCSplitALot, false, \ 1479 "Provoke splitting (copying data from a young gen space to " \ 1480 "multiple destination spaces)") \ 1481 \ 1482 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1483 "How often to provoke splitting a young gen space") \ 1484 \ 1485 product(uintx, ConcGCThreads, 0, \ 1486 "Number of threads concurrent gc will use") \ 1487 \ 1488 product(size_t, YoungPLABSize, 4096, \ 1489 "Size of young gen promotion LAB's (in HeapWords)") \ 1490 \ 1491 product(size_t, OldPLABSize, 1024, \ 1492 "Size of old gen promotion LAB's (in HeapWords), or Number \ 1493 of blocks to attempt to claim when refilling CMS LAB's") \ 1494 \ 1495 product(uintx, GCTaskTimeStampEntries, 200, \ 1496 "Number of time stamp entries per gc worker thread") \ 1497 \ 1498 product(bool, AlwaysTenure, false, \ 1499 "Always tenure objects in eden (ParallelGC only)") \ 1500 \ 1501 product(bool, NeverTenure, false, \ 1502 "Never tenure objects in eden, may tenure on overflow " \ 1503 "(ParallelGC only)") \ 1504 \ 1505 product(bool, ScavengeBeforeFullGC, true, \ 1506 "Scavenge youngest generation before each full GC.") \ 1507 \ 1508 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1509 "Allow scavenges to occur when to-space contains objects") \ 1510 \ 1511 product(bool, UseConcMarkSweepGC, false, \ 1512 "Use Concurrent Mark-Sweep GC in the old generation") \ 1513 \ 1514 product(bool, ExplicitGCInvokesConcurrent, false, \ 1515 "A System.gc() request invokes a concurrent collection; " \ 1516 "(effective only when using concurrent collectors)") \ 1517 \ 1518 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1519 "A System.gc() request invokes a concurrent collection and " \ 1520 "also unloads classes during such a concurrent gc cycle " \ 1521 "(effective only when UseConcMarkSweepGC)") \ 1522 \ 1523 product(bool, GCLockerInvokesConcurrent, false, \ 1524 "The exit of a JNI critical section necessitating a scavenge, " \ 1525 "also kicks off a background concurrent collection") \ 1526 \ 1527 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1528 "How much the GC can expand the eden by while the GC locker " \ 1529 "is active (as a percentage)") \ 1530 \ 1531 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1532 "Number of times to retry allocations when " \ 1533 "blocked by the GC locker") \ 1534 \ 1535 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1536 "Use adaptive free lists in the CMS generation") \ 1537 \ 1538 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1539 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1540 \ 1541 product(bool, UseCMSBestFit, true, \ 1542 "Use CMS best fit allocation strategy") \ 1543 \ 1544 product(bool, UseParNewGC, false, \ 1545 "Use parallel threads in the new generation") \ 1546 \ 1547 product(bool, PrintTaskqueue, false, \ 1548 "Print taskqueue statistics for parallel collectors") \ 1549 \ 1550 product(bool, PrintTerminationStats, false, \ 1551 "Print termination statistics for parallel collectors") \ 1552 \ 1553 product(uintx, ParallelGCBufferWastePct, 10, \ 1554 "Wasted fraction of parallel allocation buffer") \ 1555 \ 1556 product(uintx, TargetPLABWastePct, 10, \ 1557 "Target wasted space in last buffer as percent of overall " \ 1558 "allocation") \ 1559 \ 1560 product(uintx, PLABWeight, 75, \ 1561 "Percentage (0-100) used to weight the current sample when " \ 1562 "computing exponentially decaying average for ResizePLAB") \ 1563 \ 1564 product(bool, ResizePLAB, true, \ 1565 "Dynamically resize (survivor space) promotion LAB's") \ 1566 \ 1567 product(bool, PrintPLAB, false, \ 1568 "Print (survivor space) promotion LAB's sizing decisions") \ 1569 \ 1570 product(intx, ParGCArrayScanChunk, 50, \ 1571 "Scan a subset of object array and push remainder, if array is " \ 1572 "bigger than this") \ 1573 \ 1574 product(bool, ParGCUseLocalOverflow, false, \ 1575 "Instead of a global overflow list, use local overflow stacks") \ 1576 \ 1577 product(bool, ParGCTrimOverflow, true, \ 1578 "Eagerly trim the local overflow lists " \ 1579 "(when ParGCUseLocalOverflow)") \ 1580 \ 1581 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1582 "Simulate work queue overflow in ParNew") \ 1583 \ 1584 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1585 "An `interval' counter that determines how frequently " \ 1586 "we simulate overflow; a smaller number increases frequency") \ 1587 \ 1588 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1589 "The desired number of objects to claim from the overflow list") \ 1590 \ 1591 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1592 "The number of strides per worker thread that we divide up the " \ 1593 "card table scanning work into") \ 1594 \ 1595 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1596 "The number of cards in each chunk of the parallel chunks used " \ 1597 "during card table scanning") \ 1598 \ 1599 product(uintx, OldPLABWeight, 50, \ 1600 "Percentage (0-100) used to weight the current sample when " \ 1601 "computing exponentially decaying average for resizing " \ 1602 "OldPLABSize") \ 1603 \ 1604 product(bool, ResizeOldPLAB, true, \ 1605 "Dynamically resize (old gen) promotion LAB's") \ 1606 \ 1607 product(bool, PrintOldPLAB, false, \ 1608 "Print (old gen) promotion LAB's sizing decisions") \ 1609 \ 1610 product(size_t, CMSOldPLABMin, 16, \ 1611 "Minimum size of CMS gen promotion LAB caches per worker " \ 1612 "per block size") \ 1613 \ 1614 product(size_t, CMSOldPLABMax, 1024, \ 1615 "Maximum size of CMS gen promotion LAB caches per worker " \ 1616 "per block size") \ 1617 \ 1618 product(uintx, CMSOldPLABNumRefills, 4, \ 1619 "Nominal number of refills of CMS gen promotion LAB cache " \ 1620 "per worker per block size") \ 1621 \ 1622 product(bool, CMSOldPLABResizeQuicker, false, \ 1623 "React on-the-fly during a scavenge to a sudden " \ 1624 "change in block demand rate") \ 1625 \ 1626 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1627 "The tolerance of the phase-change detector for on-the-fly " \ 1628 "PLAB resizing during a scavenge") \ 1629 \ 1630 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1631 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1632 "during a scavenge") \ 1633 \ 1634 product(bool, AlwaysPreTouch, false, \ 1635 "Force all freshly committed pages to be pre-touched") \ 1636 \ 1637 product_pd(size_t, CMSYoungGenPerWorker, \ 1638 "The maximum size of young gen chosen by default per GC worker " \ 1639 "thread available") \ 1640 \ 1641 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1642 "Percentage (0-100) used to add conservatism when computing the " \ 1643 "duty cycle") \ 1644 \ 1645 product(uintx, CMSExpAvgFactor, 50, \ 1646 "Percentage (0-100) used to weight the current sample when " \ 1647 "computing exponential averages for CMS statistics") \ 1648 \ 1649 product(uintx, CMS_FLSWeight, 75, \ 1650 "Percentage (0-100) used to weight the current sample when " \ 1651 "computing exponentially decaying averages for CMS FLS " \ 1652 "statistics") \ 1653 \ 1654 product(uintx, CMS_FLSPadding, 1, \ 1655 "The multiple of deviation from mean to use for buffering " \ 1656 "against volatility in free list demand") \ 1657 \ 1658 product(uintx, FLSCoalescePolicy, 2, \ 1659 "CMS: aggressiveness level for coalescing, increasing " \ 1660 "from 0 to 4") \ 1661 \ 1662 product(bool, FLSAlwaysCoalesceLarge, false, \ 1663 "CMS: larger free blocks are always available for coalescing") \ 1664 \ 1665 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1666 "CMS: the smaller the percentage the greater the coalescing " \ 1667 "force") \ 1668 \ 1669 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1670 "CMS: the factor by which to inflate estimated demand of small " \ 1671 "block sizes to prevent coalescing with an adjoining block") \ 1672 \ 1673 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1674 "CMS: the factor by which to inflate estimated demand of large " \ 1675 "block sizes to prevent coalescing with an adjoining block") \ 1676 \ 1677 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1678 "CMS: the factor by which to inflate estimated demand of small " \ 1679 "block sizes to prevent splitting to supply demand for smaller " \ 1680 "blocks") \ 1681 \ 1682 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1683 "CMS: the factor by which to inflate estimated demand of large " \ 1684 "block sizes to prevent splitting to supply demand for smaller " \ 1685 "blocks") \ 1686 \ 1687 product(bool, CMSExtrapolateSweep, false, \ 1688 "CMS: cushion for block demand during sweep") \ 1689 \ 1690 product(uintx, CMS_SweepWeight, 75, \ 1691 "Percentage (0-100) used to weight the current sample when " \ 1692 "computing exponentially decaying average for inter-sweep " \ 1693 "duration") \ 1694 \ 1695 product(uintx, CMS_SweepPadding, 1, \ 1696 "The multiple of deviation from mean to use for buffering " \ 1697 "against volatility in inter-sweep duration") \ 1698 \ 1699 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1700 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1701 "duration exceeds this threshold in milliseconds") \ 1702 \ 1703 product(bool, CMSClassUnloadingEnabled, true, \ 1704 "Whether class unloading enabled when using CMS GC") \ 1705 \ 1706 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1707 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1708 "count for which classes may not be unloaded") \ 1709 \ 1710 develop(intx, CMSDictionaryChoice, 0, \ 1711 "Use BinaryTreeDictionary as default in the CMS generation") \ 1712 \ 1713 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1714 "Replenish an indexed free list with this number of chunks") \ 1715 \ 1716 product(bool, CMSReplenishIntermediate, true, \ 1717 "Replenish all intermediate free-list caches") \ 1718 \ 1719 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1720 "When satisfying batched demand, split blocks from the " \ 1721 "IndexedFreeList whose size is a multiple of requested size") \ 1722 \ 1723 product(bool, CMSLoopWarn, false, \ 1724 "Warn in case of excessive CMS looping") \ 1725 \ 1726 develop(bool, CMSOverflowEarlyRestoration, false, \ 1727 "Restore preserved marks early") \ 1728 \ 1729 product(size_t, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1730 "Size of marking stack") \ 1731 \ 1732 product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1733 "Maximum size of marking stack") \ 1734 \ 1735 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1736 "Simulate frequent marking stack / work queue overflow") \ 1737 \ 1738 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1739 "An \"interval\" counter that determines how frequently " \ 1740 "to simulate overflow; a smaller number increases frequency") \ 1741 \ 1742 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1743 "Maximum number of abortable preclean iterations, if > 0") \ 1744 \ 1745 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1746 "Maximum time in abortable preclean (in milliseconds)") \ 1747 \ 1748 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1749 "Nominal minimum work per abortable preclean iteration") \ 1750 \ 1751 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1752 "Time that we sleep between iterations when not given " \ 1753 "enough work per iteration") \ 1754 \ 1755 product(size_t, CMSRescanMultiple, 32, \ 1756 "Size (in cards) of CMS parallel rescan task") \ 1757 \ 1758 product(size_t, CMSConcMarkMultiple, 32, \ 1759 "Size (in cards) of CMS concurrent MT marking task") \ 1760 \ 1761 product(bool, CMSAbortSemantics, false, \ 1762 "Whether abort-on-overflow semantics is implemented") \ 1763 \ 1764 product(bool, CMSParallelInitialMarkEnabled, true, \ 1765 "Use the parallel initial mark.") \ 1766 \ 1767 product(bool, CMSParallelRemarkEnabled, true, \ 1768 "Whether parallel remark enabled (only if ParNewGC)") \ 1769 \ 1770 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1771 "Whether parallel remark of survivor space " \ 1772 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1773 \ 1774 product(bool, CMSPLABRecordAlways, true, \ 1775 "Always record survivor space PLAB boundaries (effective only " \ 1776 "if CMSParallelSurvivorRemarkEnabled)") \ 1777 \ 1778 product(bool, CMSEdenChunksRecordAlways, true, \ 1779 "Always record eden chunks used for the parallel initial mark " \ 1780 "or remark of eden") \ 1781 \ 1782 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1783 "Print the eden and the survivor chunks used for the parallel " \ 1784 "initial mark or remark of the eden/survivor spaces") \ 1785 \ 1786 product(bool, CMSConcurrentMTEnabled, true, \ 1787 "Whether multi-threaded concurrent work enabled " \ 1788 "(effective only if ParNewGC)") \ 1789 \ 1790 product(bool, CMSPrecleaningEnabled, true, \ 1791 "Whether concurrent precleaning enabled") \ 1792 \ 1793 product(uintx, CMSPrecleanIter, 3, \ 1794 "Maximum number of precleaning iteration passes") \ 1795 \ 1796 product(uintx, CMSPrecleanNumerator, 2, \ 1797 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1798 "ratio") \ 1799 \ 1800 product(uintx, CMSPrecleanDenominator, 3, \ 1801 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1802 "ratio") \ 1803 \ 1804 product(bool, CMSPrecleanRefLists1, true, \ 1805 "Preclean ref lists during (initial) preclean phase") \ 1806 \ 1807 product(bool, CMSPrecleanRefLists2, false, \ 1808 "Preclean ref lists during abortable preclean phase") \ 1809 \ 1810 product(bool, CMSPrecleanSurvivors1, false, \ 1811 "Preclean survivors during (initial) preclean phase") \ 1812 \ 1813 product(bool, CMSPrecleanSurvivors2, true, \ 1814 "Preclean survivors during abortable preclean phase") \ 1815 \ 1816 product(uintx, CMSPrecleanThreshold, 1000, \ 1817 "Do not iterate again if number of dirty cards is less than this")\ 1818 \ 1819 product(bool, CMSCleanOnEnter, true, \ 1820 "Clean-on-enter optimization for reducing number of dirty cards") \ 1821 \ 1822 product(uintx, CMSRemarkVerifyVariant, 1, \ 1823 "Choose variant (1,2) of verification following remark") \ 1824 \ 1825 product(size_t, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1826 "If Eden size is below this, do not try to schedule remark") \ 1827 \ 1828 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1829 "The Eden occupancy percentage (0-100) at which " \ 1830 "to try and schedule remark pause") \ 1831 \ 1832 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1833 "Start sampling eden top at least before young gen " \ 1834 "occupancy reaches 1/<ratio> of the size at which " \ 1835 "we plan to schedule remark") \ 1836 \ 1837 product(uintx, CMSSamplingGrain, 16*K, \ 1838 "The minimum distance between eden samples for CMS (see above)") \ 1839 \ 1840 product(bool, CMSScavengeBeforeRemark, false, \ 1841 "Attempt scavenge before the CMS remark step") \ 1842 \ 1843 develop(bool, CMSTraceSweeper, false, \ 1844 "Trace some actions of the CMS sweeper") \ 1845 \ 1846 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1847 "Don't drain below this size per parallel worker/thief") \ 1848 \ 1849 manageable(intx, CMSWaitDuration, 2000, \ 1850 "Time in milliseconds that CMS thread waits for young GC") \ 1851 \ 1852 develop(uintx, CMSCheckInterval, 1000, \ 1853 "Interval in milliseconds that CMS thread checks if it " \ 1854 "should start a collection cycle") \ 1855 \ 1856 product(bool, CMSYield, true, \ 1857 "Yield between steps of CMS") \ 1858 \ 1859 product(size_t, CMSBitMapYieldQuantum, 10*M, \ 1860 "Bitmap operations should process at most this many bits " \ 1861 "between yields") \ 1862 \ 1863 product(bool, CMSDumpAtPromotionFailure, false, \ 1864 "Dump useful information about the state of the CMS old " \ 1865 "generation upon a promotion failure") \ 1866 \ 1867 product(bool, CMSPrintChunksInDump, false, \ 1868 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1869 "more detailed information about the free chunks") \ 1870 \ 1871 product(bool, CMSPrintObjectsInDump, false, \ 1872 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1873 "more detailed information about the allocated objects") \ 1874 \ 1875 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1876 "Verify that all references across the FLS boundary " \ 1877 "are to valid objects") \ 1878 \ 1879 diagnostic(bool, FLSVerifyLists, false, \ 1880 "Do lots of (expensive) FreeListSpace verification") \ 1881 \ 1882 diagnostic(bool, FLSVerifyIndexTable, false, \ 1883 "Do lots of (expensive) FLS index table verification") \ 1884 \ 1885 develop(bool, FLSVerifyDictionary, false, \ 1886 "Do lots of (expensive) FLS dictionary verification") \ 1887 \ 1888 develop(bool, VerifyBlockOffsetArray, false, \ 1889 "Do (expensive) block offset array verification") \ 1890 \ 1891 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1892 "Maintain _unallocated_block in BlockOffsetArray " \ 1893 "(currently applicable only to CMS collector)") \ 1894 \ 1895 develop(bool, TraceCMSState, false, \ 1896 "Trace the state of the CMS collection") \ 1897 \ 1898 product(intx, RefDiscoveryPolicy, 0, \ 1899 "Select type of reference discovery policy: " \ 1900 "reference-based(0) or referent-based(1)") \ 1901 \ 1902 product(bool, ParallelRefProcEnabled, false, \ 1903 "Enable parallel reference processing whenever possible") \ 1904 \ 1905 product(bool, ParallelRefProcBalancingEnabled, true, \ 1906 "Enable balancing of reference processing queues") \ 1907 \ 1908 product(uintx, CMSTriggerRatio, 80, \ 1909 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1910 "allocated before a CMS collection cycle commences") \ 1911 \ 1912 product(uintx, CMSBootstrapOccupancy, 50, \ 1913 "Percentage CMS generation occupancy at which to " \ 1914 "initiate CMS collection for bootstrapping collection stats") \ 1915 \ 1916 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1917 "Percentage CMS generation occupancy to start a CMS collection " \ 1918 "cycle. A negative value means that CMSTriggerRatio is used") \ 1919 \ 1920 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1921 "Percentage of the (entire) heap occupancy to start a " \ 1922 "concurrent GC cycle. It is used by GCs that trigger a " \ 1923 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1924 "not just one of the generations (e.g., G1). A value of 0 " \ 1925 "denotes 'do constant GC cycles'.") \ 1926 \ 1927 manageable(intx, CMSTriggerInterval, -1, \ 1928 "Commence a CMS collection cycle (at least) every so many " \ 1929 "milliseconds (0 permanently, -1 disabled)") \ 1930 \ 1931 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1932 "Only use occupancy as a criterion for starting a CMS collection")\ 1933 \ 1934 product(uintx, CMSIsTooFullPercentage, 98, \ 1935 "An absolute ceiling above which CMS will always consider the " \ 1936 "unloading of classes when class unloading is enabled") \ 1937 \ 1938 develop(bool, CMSTestInFreeList, false, \ 1939 "Check if the coalesced range is already in the " \ 1940 "free lists as claimed") \ 1941 \ 1942 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1943 "Check that all the garbage collected was returned to the " \ 1944 "free lists") \ 1945 \ 1946 notproduct(bool, ScavengeALot, false, \ 1947 "Force scavenge at every Nth exit from the runtime system " \ 1948 "(N=ScavengeALotInterval)") \ 1949 \ 1950 develop(bool, FullGCALot, false, \ 1951 "Force full gc at every Nth exit from the runtime system " \ 1952 "(N=FullGCALotInterval)") \ 1953 \ 1954 notproduct(bool, GCALotAtAllSafepoints, false, \ 1955 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1956 \ 1957 product(bool, PrintPromotionFailure, false, \ 1958 "Print additional diagnostic information following " \ 1959 "promotion failure") \ 1960 \ 1961 notproduct(bool, PromotionFailureALot, false, \ 1962 "Use promotion failure handling on every youngest generation " \ 1963 "collection") \ 1964 \ 1965 develop(uintx, PromotionFailureALotCount, 1000, \ 1966 "Number of promotion failures occurring at ParGCAllocBuffer " \ 1967 "refill attempts (ParNew) or promotion attempts " \ 1968 "(other young collectors)") \ 1969 \ 1970 develop(uintx, PromotionFailureALotInterval, 5, \ 1971 "Total collections between promotion failures a lot") \ 1972 \ 1973 experimental(uintx, WorkStealingSleepMillis, 1, \ 1974 "Sleep time when sleep is used for yields") \ 1975 \ 1976 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1977 "Number of yields before a sleep is done during work stealing") \ 1978 \ 1979 experimental(uintx, WorkStealingHardSpins, 4096, \ 1980 "Number of iterations in a spin loop between checks on " \ 1981 "time out of hard spin") \ 1982 \ 1983 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1984 "Ratio of hard spins to calls to yield") \ 1985 \ 1986 develop(uintx, ObjArrayMarkingStride, 512, \ 1987 "Number of object array elements to push onto the marking stack " \ 1988 "before pushing a continuation entry") \ 1989 \ 1990 develop(bool, MetadataAllocationFailALot, false, \ 1991 "Fail metadata allocations at intervals controlled by " \ 1992 "MetadataAllocationFailALotInterval") \ 1993 \ 1994 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1995 "Metadata allocation failure a lot interval") \ 1996 \ 1997 develop(bool, TraceMetadataChunkAllocation, false, \ 1998 "Trace chunk metadata allocations") \ 1999 \ 2000 product(bool, TraceMetadataHumongousAllocation, false, \ 2001 "Trace humongous metadata allocations") \ 2002 \ 2003 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2004 "Trace virtual space metadata allocations") \ 2005 \ 2006 notproduct(bool, ExecuteInternalVMTests, false, \ 2007 "Enable execution of internal VM tests") \ 2008 \ 2009 notproduct(bool, VerboseInternalVMTests, false, \ 2010 "Turn on logging for internal VM tests.") \ 2011 \ 2012 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2013 \ 2014 product_pd(bool, ResizeTLAB, \ 2015 "Dynamically resize TLAB size for threads") \ 2016 \ 2017 product(bool, ZeroTLAB, false, \ 2018 "Zero out the newly created TLAB") \ 2019 \ 2020 product(bool, FastTLABRefill, true, \ 2021 "Use fast TLAB refill code") \ 2022 \ 2023 product(bool, PrintTLAB, false, \ 2024 "Print various TLAB related information") \ 2025 \ 2026 product(bool, TLABStats, true, \ 2027 "Provide more detailed and expensive TLAB statistics " \ 2028 "(with PrintTLAB)") \ 2029 \ 2030 product_pd(bool, NeverActAsServerClassMachine, \ 2031 "Never act like a server-class machine") \ 2032 \ 2033 product(bool, AlwaysActAsServerClassMachine, false, \ 2034 "Always act like a server-class machine") \ 2035 \ 2036 product_pd(uint64_t, MaxRAM, \ 2037 "Real memory size (in bytes) used to set maximum heap size") \ 2038 \ 2039 product(size_t, ErgoHeapSizeLimit, 0, \ 2040 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2041 "MaxRAM / MaxRAMFraction") \ 2042 \ 2043 product(uintx, MaxRAMFraction, 4, \ 2044 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2045 "size") \ 2046 \ 2047 product(uintx, DefaultMaxRAMFraction, 4, \ 2048 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2049 "size; deprecated: to be renamed to MaxRAMFraction") \ 2050 \ 2051 product(uintx, MinRAMFraction, 2, \ 2052 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2053 "size on systems with small physical memory size") \ 2054 \ 2055 product(uintx, InitialRAMFraction, 64, \ 2056 "Fraction (1/n) of real memory used for initial heap size") \ 2057 \ 2058 develop(uintx, MaxVirtMemFraction, 2, \ 2059 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2060 "determining maximum heap size") \ 2061 \ 2062 product(bool, UseAutoGCSelectPolicy, false, \ 2063 "Use automatic collection selection policy") \ 2064 \ 2065 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2066 "Automatic GC selection pause threshold in milliseconds") \ 2067 \ 2068 product(bool, UseAdaptiveSizePolicy, true, \ 2069 "Use adaptive generation sizing policies") \ 2070 \ 2071 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2072 "Use adaptive survivor sizing policies") \ 2073 \ 2074 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2075 "Use adaptive young-old sizing policies at minor collections") \ 2076 \ 2077 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2078 "Use adaptive young-old sizing policies at major collections") \ 2079 \ 2080 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2081 "Include statistics from System.gc() for adaptive size policy") \ 2082 \ 2083 product(bool, UseAdaptiveGCBoundary, false, \ 2084 "Allow young-old boundary to move") \ 2085 \ 2086 develop(bool, TraceAdaptiveGCBoundary, false, \ 2087 "Trace young-old boundary moves") \ 2088 \ 2089 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2090 "Resize the virtual spaces of the young or old generations") \ 2091 \ 2092 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2093 "Policy for changing generation size for throughput goals") \ 2094 \ 2095 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2096 "Adjust tenured generation to achieve a minor pause goal") \ 2097 \ 2098 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2099 "Adjust young generation to achieve a major pause goal") \ 2100 \ 2101 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2102 "Number of steps where heuristics is used before data is used") \ 2103 \ 2104 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2105 "Number of collections before the adaptive sizing is started") \ 2106 \ 2107 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2108 "Collection interval for printing information; zero means never") \ 2109 \ 2110 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2111 "Use adaptive minimum footprint as a goal") \ 2112 \ 2113 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2114 "Weight given to exponential resizing, between 0 and 100") \ 2115 \ 2116 product(uintx, AdaptiveTimeWeight, 25, \ 2117 "Weight given to time in adaptive policy, between 0 and 100") \ 2118 \ 2119 product(uintx, PausePadding, 1, \ 2120 "How much buffer to keep for pause time") \ 2121 \ 2122 product(uintx, PromotedPadding, 3, \ 2123 "How much buffer to keep for promotion failure") \ 2124 \ 2125 product(uintx, SurvivorPadding, 3, \ 2126 "How much buffer to keep for survivor overflow") \ 2127 \ 2128 product(uintx, ThresholdTolerance, 10, \ 2129 "Allowed collection cost difference between generations") \ 2130 \ 2131 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2132 "If collection costs are within margin, reduce both by full " \ 2133 "delta") \ 2134 \ 2135 product(uintx, YoungGenerationSizeIncrement, 20, \ 2136 "Adaptive size percentage change in young generation") \ 2137 \ 2138 product(uintx, YoungGenerationSizeSupplement, 80, \ 2139 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2140 \ 2141 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2142 "Decay factor to YoungedGenerationSizeSupplement") \ 2143 \ 2144 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2145 "Adaptive size percentage change in tenured generation") \ 2146 \ 2147 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2148 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2149 \ 2150 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2151 "Decay factor to TenuredGenerationSizeIncrement") \ 2152 \ 2153 product(uintx, MaxGCPauseMillis, max_uintx, \ 2154 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2155 "or (G1 Only) the maximum GC time per MMU time slice") \ 2156 \ 2157 product(uintx, GCPauseIntervalMillis, 0, \ 2158 "Time slice for MMU specification") \ 2159 \ 2160 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2161 "Adaptive size policy maximum GC minor pause time goal " \ 2162 "in millisecond") \ 2163 \ 2164 product(uintx, GCTimeRatio, 99, \ 2165 "Adaptive size policy application time to GC time ratio") \ 2166 \ 2167 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2168 "Adaptive size scale down factor for shrinking") \ 2169 \ 2170 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2171 "Adaptive size decays the major cost for long major intervals") \ 2172 \ 2173 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2174 "Time scale over which major costs decay") \ 2175 \ 2176 product(uintx, MinSurvivorRatio, 3, \ 2177 "Minimum ratio of young generation/survivor space size") \ 2178 \ 2179 product(uintx, InitialSurvivorRatio, 8, \ 2180 "Initial ratio of young generation/survivor space size") \ 2181 \ 2182 product(size_t, BaseFootPrintEstimate, 256*M, \ 2183 "Estimate of footprint other than Java Heap") \ 2184 \ 2185 product(bool, UseGCOverheadLimit, true, \ 2186 "Use policy to limit of proportion of time spent in GC " \ 2187 "before an OutOfMemory error is thrown") \ 2188 \ 2189 product(uintx, GCTimeLimit, 98, \ 2190 "Limit of the proportion of time spent in GC before " \ 2191 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2192 \ 2193 product(uintx, GCHeapFreeLimit, 2, \ 2194 "Minimum percentage of free space after a full GC before an " \ 2195 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2196 \ 2197 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2198 "Number of consecutive collections before gc time limit fires") \ 2199 \ 2200 product(bool, PrintAdaptiveSizePolicy, false, \ 2201 "Print information about AdaptiveSizePolicy") \ 2202 \ 2203 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2204 "How far ahead to prefetch destination area (<= 0 means off)") \ 2205 \ 2206 product(intx, PrefetchScanIntervalInBytes, -1, \ 2207 "How far ahead to prefetch scan area (<= 0 means off)") \ 2208 \ 2209 product(intx, PrefetchFieldsAhead, -1, \ 2210 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2211 \ 2212 diagnostic(bool, VerifySilently, false, \ 2213 "Do not print the verification progress") \ 2214 \ 2215 diagnostic(bool, VerifyDuringStartup, false, \ 2216 "Verify memory system before executing any Java code " \ 2217 "during VM initialization") \ 2218 \ 2219 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2220 "Verify system before exiting") \ 2221 \ 2222 diagnostic(bool, VerifyBeforeGC, false, \ 2223 "Verify memory system before GC") \ 2224 \ 2225 diagnostic(bool, VerifyAfterGC, false, \ 2226 "Verify memory system after GC") \ 2227 \ 2228 diagnostic(bool, VerifyDuringGC, false, \ 2229 "Verify memory system during GC (between phases)") \ 2230 \ 2231 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2232 "Enable parallel memory system verification") \ 2233 \ 2234 diagnostic(bool, DeferInitialCardMark, false, \ 2235 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2236 "may arise from new_pre_store_barrier") \ 2237 \ 2238 product(bool, UseCondCardMark, false, \ 2239 "Check for already marked card before updating card table") \ 2240 \ 2241 diagnostic(bool, VerifyRememberedSets, false, \ 2242 "Verify GC remembered sets") \ 2243 \ 2244 diagnostic(bool, VerifyObjectStartArray, true, \ 2245 "Verify GC object start array if verify before/after") \ 2246 \ 2247 product(bool, DisableExplicitGC, false, \ 2248 "Ignore calls to System.gc()") \ 2249 \ 2250 notproduct(bool, CheckMemoryInitialization, false, \ 2251 "Check memory initialization") \ 2252 \ 2253 diagnostic(bool, BindCMSThreadToCPU, false, \ 2254 "Bind CMS Thread to CPU if possible") \ 2255 \ 2256 diagnostic(uintx, CPUForCMSThread, 0, \ 2257 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2258 \ 2259 product(bool, BindGCTaskThreadsToCPUs, false, \ 2260 "Bind GCTaskThreads to CPUs if possible") \ 2261 \ 2262 product(bool, UseGCTaskAffinity, false, \ 2263 "Use worker affinity when asking for GCTasks") \ 2264 \ 2265 product(uintx, ProcessDistributionStride, 4, \ 2266 "Stride through processors when distributing processes") \ 2267 \ 2268 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2269 "Number of times the coordinator GC thread will sleep while " \ 2270 "yielding before giving up and resuming GC") \ 2271 \ 2272 product(uintx, CMSYieldSleepCount, 0, \ 2273 "Number of times a GC thread (minus the coordinator) " \ 2274 "will sleep while yielding before giving up and resuming GC") \ 2275 \ 2276 /* gc tracing */ \ 2277 manageable(bool, PrintGC, false, \ 2278 "Print message at garbage collection") \ 2279 \ 2280 manageable(bool, PrintGCDetails, false, \ 2281 "Print more details at garbage collection") \ 2282 \ 2283 manageable(bool, PrintGCDateStamps, false, \ 2284 "Print date stamps at garbage collection") \ 2285 \ 2286 manageable(bool, PrintGCTimeStamps, false, \ 2287 "Print timestamps at garbage collection") \ 2288 \ 2289 manageable(bool, PrintGCID, true, \ 2290 "Print an identifier for each garbage collection") \ 2291 \ 2292 product(bool, PrintGCTaskTimeStamps, false, \ 2293 "Print timestamps for individual gc worker thread tasks") \ 2294 \ 2295 develop(intx, ConcGCYieldTimeout, 0, \ 2296 "If non-zero, assert that GC threads yield within this " \ 2297 "number of milliseconds") \ 2298 \ 2299 notproduct(bool, TraceMarkSweep, false, \ 2300 "Trace mark sweep") \ 2301 \ 2302 product(bool, PrintReferenceGC, false, \ 2303 "Print times spent handling reference objects during GC " \ 2304 "(enabled only when PrintGCDetails)") \ 2305 \ 2306 develop(bool, TraceReferenceGC, false, \ 2307 "Trace handling of soft/weak/final/phantom references") \ 2308 \ 2309 develop(bool, TraceFinalizerRegistration, false, \ 2310 "Trace registration of final references") \ 2311 \ 2312 notproduct(bool, TraceScavenge, false, \ 2313 "Trace scavenge") \ 2314 \ 2315 product(bool, IgnoreEmptyClassPaths, false, \ 2316 "Ignore empty path elements in -classpath") \ 2317 \ 2318 product(bool, TraceClassPaths, false, \ 2319 "Trace processing of class paths") \ 2320 \ 2321 product_rw(bool, TraceClassLoading, false, \ 2322 "Trace all classes loaded") \ 2323 \ 2324 product(bool, TraceClassLoadingPreorder, false, \ 2325 "Trace all classes loaded in order referenced (not loaded)") \ 2326 \ 2327 product_rw(bool, TraceClassUnloading, false, \ 2328 "Trace unloading of classes") \ 2329 \ 2330 product_rw(bool, TraceLoaderConstraints, false, \ 2331 "Trace loader constraints") \ 2332 \ 2333 develop(bool, TraceClassLoaderData, false, \ 2334 "Trace class loader loader_data lifetime") \ 2335 \ 2336 product(size_t, InitialBootClassLoaderMetaspaceSize, \ 2337 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2338 "Initial size of the boot class loader data metaspace") \ 2339 \ 2340 product(bool, TraceYoungGenTime, false, \ 2341 "Trace accumulated time for young collection") \ 2342 \ 2343 product(bool, TraceOldGenTime, false, \ 2344 "Trace accumulated time for old collection") \ 2345 \ 2346 product(bool, PrintTenuringDistribution, false, \ 2347 "Print tenuring age information") \ 2348 \ 2349 product_rw(bool, PrintHeapAtGC, false, \ 2350 "Print heap layout before and after each GC") \ 2351 \ 2352 product_rw(bool, PrintHeapAtGCExtended, false, \ 2353 "Print extended information about the layout of the heap " \ 2354 "when -XX:+PrintHeapAtGC is set") \ 2355 \ 2356 product(bool, PrintHeapAtSIGBREAK, true, \ 2357 "Print heap layout in response to SIGBREAK") \ 2358 \ 2359 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2360 "Print a class histogram before any major stop-world GC") \ 2361 \ 2362 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2363 "Print a class histogram after any major stop-world GC") \ 2364 \ 2365 manageable(bool, PrintClassHistogram, false, \ 2366 "Print a histogram of class instances") \ 2367 \ 2368 develop(bool, TraceWorkGang, false, \ 2369 "Trace activities of work gangs") \ 2370 \ 2371 product(bool, TraceParallelOldGCTasks, false, \ 2372 "Trace multithreaded GC activity") \ 2373 \ 2374 develop(bool, TraceBlockOffsetTable, false, \ 2375 "Print BlockOffsetTable maps") \ 2376 \ 2377 develop(bool, TraceCardTableModRefBS, false, \ 2378 "Print CardTableModRefBS maps") \ 2379 \ 2380 develop(bool, TraceGCTaskManager, false, \ 2381 "Trace actions of the GC task manager") \ 2382 \ 2383 develop(bool, TraceGCTaskQueue, false, \ 2384 "Trace actions of the GC task queues") \ 2385 \ 2386 diagnostic(bool, TraceGCTaskThread, false, \ 2387 "Trace actions of the GC task threads") \ 2388 \ 2389 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2390 "Print the time taken by each phase in ParallelOldGC " \ 2391 "(PrintGCDetails must also be enabled)") \ 2392 \ 2393 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2394 "Trace marking phase in ParallelOldGC") \ 2395 \ 2396 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2397 "Trace summary phase in ParallelOldGC") \ 2398 \ 2399 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2400 "Trace compaction phase in ParallelOldGC") \ 2401 \ 2402 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2403 "Trace dense prefix computation for ParallelOldGC") \ 2404 \ 2405 develop(bool, IgnoreLibthreadGPFault, false, \ 2406 "Suppress workaround for libthread GP fault") \ 2407 \ 2408 product(bool, PrintJNIGCStalls, false, \ 2409 "Print diagnostic message when GC is stalled " \ 2410 "by JNI critical section") \ 2411 \ 2412 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2413 "The percentage of the used heap that the instances of a class " \ 2414 "must occupy for the class to generate a trace event") \ 2415 \ 2416 /* GC log rotation setting */ \ 2417 \ 2418 product(bool, UseGCLogFileRotation, false, \ 2419 "Rotate gclog files (for long running applications). It requires "\ 2420 "-Xloggc:<filename>") \ 2421 \ 2422 product(uintx, NumberOfGCLogFiles, 0, \ 2423 "Number of gclog files in rotation " \ 2424 "(default: 0, no rotation)") \ 2425 \ 2426 product(size_t, GCLogFileSize, 8*K, \ 2427 "GC log file size, requires UseGCLogFileRotation. " \ 2428 "Set to 0 to only trigger rotation via jcmd") \ 2429 \ 2430 /* JVMTI heap profiling */ \ 2431 \ 2432 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2433 "Trace JVMTI object tagging calls") \ 2434 \ 2435 diagnostic(bool, VerifyBeforeIteration, false, \ 2436 "Verify memory system before JVMTI iteration") \ 2437 \ 2438 /* compiler interface */ \ 2439 \ 2440 develop(bool, CIPrintCompilerName, false, \ 2441 "when CIPrint is active, print the name of the active compiler") \ 2442 \ 2443 diagnostic(bool, CIPrintCompileQueue, false, \ 2444 "display the contents of the compile queue whenever a " \ 2445 "compilation is enqueued") \ 2446 \ 2447 develop(bool, CIPrintRequests, false, \ 2448 "display every request for compilation") \ 2449 \ 2450 product(bool, CITime, false, \ 2451 "collect timing information for compilation") \ 2452 \ 2453 develop(bool, CITimeVerbose, false, \ 2454 "be more verbose in compilation timings") \ 2455 \ 2456 develop(bool, CITimeEach, false, \ 2457 "display timing information after each successful compilation") \ 2458 \ 2459 develop(bool, CICountOSR, false, \ 2460 "use a separate counter when assigning ids to osr compilations") \ 2461 \ 2462 develop(bool, CICompileNatives, true, \ 2463 "compile native methods if supported by the compiler") \ 2464 \ 2465 develop_pd(bool, CICompileOSR, \ 2466 "compile on stack replacement methods if supported by the " \ 2467 "compiler") \ 2468 \ 2469 develop(bool, CIPrintMethodCodes, false, \ 2470 "print method bytecodes of the compiled code") \ 2471 \ 2472 develop(bool, CIPrintTypeFlow, false, \ 2473 "print the results of ciTypeFlow analysis") \ 2474 \ 2475 develop(bool, CITraceTypeFlow, false, \ 2476 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2477 \ 2478 develop(intx, OSROnlyBCI, -1, \ 2479 "OSR only at this bci. Negative values mean exclude that bci") \ 2480 \ 2481 /* compiler */ \ 2482 \ 2483 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2484 "Number of compiler threads to run") \ 2485 \ 2486 product(intx, CompilationPolicyChoice, 0, \ 2487 "which compilation policy (0-3)") \ 2488 \ 2489 develop(bool, UseStackBanging, true, \ 2490 "use stack banging for stack overflow checks (required for " \ 2491 "proper StackOverflow handling; disable only to measure cost " \ 2492 "of stackbanging)") \ 2493 \ 2494 develop(bool, UseStrictFP, true, \ 2495 "use strict fp if modifier strictfp is set") \ 2496 \ 2497 develop(bool, GenerateSynchronizationCode, true, \ 2498 "generate locking/unlocking code for synchronized methods and " \ 2499 "monitors") \ 2500 \ 2501 develop(bool, GenerateCompilerNullChecks, true, \ 2502 "Generate explicit null checks for loads/stores/calls") \ 2503 \ 2504 develop(bool, GenerateRangeChecks, true, \ 2505 "Generate range checks for array accesses") \ 2506 \ 2507 develop_pd(bool, ImplicitNullChecks, \ 2508 "Generate code for implicit null checks") \ 2509 \ 2510 product_pd(bool, TrapBasedNullChecks, \ 2511 "Generate code for null checks that uses a cmp and trap " \ 2512 "instruction raising SIGTRAP. This is only used if an access to" \ 2513 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2514 "ImplicitNullChecks don't work (PPC64).") \ 2515 \ 2516 product(bool, PrintSafepointStatistics, false, \ 2517 "Print statistics about safepoint synchronization") \ 2518 \ 2519 product(intx, PrintSafepointStatisticsCount, 300, \ 2520 "Total number of safepoint statistics collected " \ 2521 "before printing them out") \ 2522 \ 2523 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2524 "Print safepoint statistics only when safepoint takes " \ 2525 "more than PrintSafepointSatisticsTimeout in millis") \ 2526 \ 2527 product(bool, TraceSafepointCleanupTime, false, \ 2528 "Print the break down of clean up tasks performed during " \ 2529 "safepoint") \ 2530 \ 2531 product(bool, Inline, true, \ 2532 "Enable inlining") \ 2533 \ 2534 product(bool, ClipInlining, true, \ 2535 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2536 \ 2537 develop(bool, UseCHA, true, \ 2538 "Enable CHA") \ 2539 \ 2540 product(bool, UseTypeProfile, true, \ 2541 "Check interpreter profile for historically monomorphic calls") \ 2542 \ 2543 diagnostic(bool, PrintInlining, false, \ 2544 "Print inlining optimizations") \ 2545 \ 2546 product(bool, UsePopCountInstruction, false, \ 2547 "Use population count instruction") \ 2548 \ 2549 develop(bool, EagerInitialization, false, \ 2550 "Eagerly initialize classes if possible") \ 2551 \ 2552 develop(bool, TraceMethodReplacement, false, \ 2553 "Print when methods are replaced do to recompilation") \ 2554 \ 2555 develop(bool, PrintMethodFlushing, false, \ 2556 "Print the nmethods being flushed") \ 2557 \ 2558 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2559 "print statistics about method flushing") \ 2560 \ 2561 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2562 "Number of compiled code invocations after which " \ 2563 "the method is considered as hot by the flusher") \ 2564 \ 2565 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2566 "Minimum number of sweeper passes before an nmethod " \ 2567 "can be flushed") \ 2568 \ 2569 product(bool, UseCodeAging, true, \ 2570 "Insert counter to detect warm methods") \ 2571 \ 2572 diagnostic(bool, StressCodeAging, false, \ 2573 "Start with counters compiled in") \ 2574 \ 2575 develop(bool, UseRelocIndex, false, \ 2576 "Use an index to speed random access to relocations") \ 2577 \ 2578 develop(bool, StressCodeBuffers, false, \ 2579 "Exercise code buffer expansion and other rare state changes") \ 2580 \ 2581 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2582 "Generate extra debugging information for non-safepoints in " \ 2583 "nmethods") \ 2584 \ 2585 product(bool, PrintVMOptions, false, \ 2586 "Print flags that appeared on the command line") \ 2587 \ 2588 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2589 "Ignore unrecognized VM options") \ 2590 \ 2591 product(bool, PrintCommandLineFlags, false, \ 2592 "Print flags specified on command line or set by ergonomics") \ 2593 \ 2594 product(bool, PrintFlagsInitial, false, \ 2595 "Print all VM flags before argument processing and exit VM") \ 2596 \ 2597 product(bool, PrintFlagsFinal, false, \ 2598 "Print all VM flags after argument and ergonomic processing") \ 2599 \ 2600 notproduct(bool, PrintFlagsWithComments, false, \ 2601 "Print all VM flags with default values and descriptions and " \ 2602 "exit") \ 2603 \ 2604 diagnostic(bool, SerializeVMOutput, true, \ 2605 "Use a mutex to serialize output to tty and LogFile") \ 2606 \ 2607 diagnostic(bool, DisplayVMOutput, true, \ 2608 "Display all VM output on the tty, independently of LogVMOutput") \ 2609 \ 2610 diagnostic(bool, LogVMOutput, false, \ 2611 "Save VM output to LogFile") \ 2612 \ 2613 diagnostic(ccstr, LogFile, NULL, \ 2614 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2615 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2616 \ 2617 product(ccstr, ErrorFile, NULL, \ 2618 "If an error occurs, save the error data to this file " \ 2619 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2620 \ 2621 product(bool, DisplayVMOutputToStderr, false, \ 2622 "If DisplayVMOutput is true, display all VM output to stderr") \ 2623 \ 2624 product(bool, DisplayVMOutputToStdout, false, \ 2625 "If DisplayVMOutput is true, display all VM output to stdout") \ 2626 \ 2627 product(bool, UseHeavyMonitors, false, \ 2628 "use heavyweight instead of lightweight Java monitors") \ 2629 \ 2630 product(bool, PrintStringTableStatistics, false, \ 2631 "print statistics about the StringTable and SymbolTable") \ 2632 \ 2633 diagnostic(bool, VerifyStringTableAtExit, false, \ 2634 "verify StringTable contents at exit") \ 2635 \ 2636 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2637 "print histogram of the symbol table") \ 2638 \ 2639 notproduct(bool, ExitVMOnVerifyError, false, \ 2640 "standard exit from VM if bytecode verify error " \ 2641 "(only in debug mode)") \ 2642 \ 2643 notproduct(ccstr, AbortVMOnException, NULL, \ 2644 "Call fatal if this exception is thrown. Example: " \ 2645 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2646 \ 2647 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2648 "Call fatal if the exception pointed by AbortVMOnException " \ 2649 "has this message") \ 2650 \ 2651 develop(bool, DebugVtables, false, \ 2652 "add debugging code to vtable dispatch") \ 2653 \ 2654 develop(bool, PrintVtables, false, \ 2655 "print vtables when printing klass") \ 2656 \ 2657 notproduct(bool, PrintVtableStats, false, \ 2658 "print vtables stats at end of run") \ 2659 \ 2660 develop(bool, TraceCreateZombies, false, \ 2661 "trace creation of zombie nmethods") \ 2662 \ 2663 notproduct(bool, IgnoreLockingAssertions, false, \ 2664 "disable locking assertions (for speed)") \ 2665 \ 2666 product(bool, RangeCheckElimination, true, \ 2667 "Eliminate range checks") \ 2668 \ 2669 develop_pd(bool, UncommonNullCast, \ 2670 "track occurrences of null in casts; adjust compiler tactics") \ 2671 \ 2672 develop(bool, TypeProfileCasts, true, \ 2673 "treat casts like calls for purposes of type profiling") \ 2674 \ 2675 develop(bool, DelayCompilationDuringStartup, true, \ 2676 "Delay invoking the compiler until main application class is " \ 2677 "loaded") \ 2678 \ 2679 develop(bool, CompileTheWorld, false, \ 2680 "Compile all methods in all classes in bootstrap class path " \ 2681 "(stress test)") \ 2682 \ 2683 develop(bool, CompileTheWorldPreloadClasses, true, \ 2684 "Preload all classes used by a class before start loading") \ 2685 \ 2686 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2687 "Force a safepoint every n compiles so sweeper can keep up") \ 2688 \ 2689 develop(bool, FillDelaySlots, true, \ 2690 "Fill delay slots (on SPARC only)") \ 2691 \ 2692 develop(bool, TimeLivenessAnalysis, false, \ 2693 "Time computation of bytecode liveness analysis") \ 2694 \ 2695 develop(bool, TraceLivenessGen, false, \ 2696 "Trace the generation of liveness analysis information") \ 2697 \ 2698 notproduct(bool, TraceLivenessQuery, false, \ 2699 "Trace queries of liveness analysis information") \ 2700 \ 2701 notproduct(bool, CollectIndexSetStatistics, false, \ 2702 "Collect information about IndexSets") \ 2703 \ 2704 develop(bool, UseLoopSafepoints, true, \ 2705 "Generate Safepoint nodes in every loop") \ 2706 \ 2707 develop(intx, FastAllocateSizeLimit, 128*K, \ 2708 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2709 "Inline allocations larger than this in doublewords must go slow")\ 2710 \ 2711 product(bool, AggressiveOpts, false, \ 2712 "Enable aggressive optimizations - see arguments.cpp") \ 2713 \ 2714 product_pd(uintx, TypeProfileLevel, \ 2715 "=XYZ, with Z: Type profiling of arguments at call; " \ 2716 "Y: Type profiling of return value at call; " \ 2717 "X: Type profiling of parameters to methods; " \ 2718 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2719 \ 2720 product(intx, TypeProfileArgsLimit, 2, \ 2721 "max number of call arguments to consider for type profiling") \ 2722 \ 2723 product(intx, TypeProfileParmsLimit, 2, \ 2724 "max number of incoming parameters to consider for type profiling"\ 2725 ", -1 for all") \ 2726 \ 2727 /* statistics */ \ 2728 develop(bool, CountCompiledCalls, false, \ 2729 "Count method invocations") \ 2730 \ 2731 notproduct(bool, CountRuntimeCalls, false, \ 2732 "Count VM runtime calls") \ 2733 \ 2734 develop(bool, CountJNICalls, false, \ 2735 "Count jni method invocations") \ 2736 \ 2737 notproduct(bool, CountJVMCalls, false, \ 2738 "Count jvm method invocations") \ 2739 \ 2740 notproduct(bool, CountRemovableExceptions, false, \ 2741 "Count exceptions that could be replaced by branches due to " \ 2742 "inlining") \ 2743 \ 2744 notproduct(bool, ICMissHistogram, false, \ 2745 "Produce histogram of IC misses") \ 2746 \ 2747 notproduct(bool, PrintClassStatistics, false, \ 2748 "Print class statistics at end of run") \ 2749 \ 2750 notproduct(bool, PrintMethodStatistics, false, \ 2751 "Print method statistics at end of run") \ 2752 \ 2753 /* interpreter */ \ 2754 develop(bool, ClearInterpreterLocals, false, \ 2755 "Always clear local variables of interpreter activations upon " \ 2756 "entry") \ 2757 \ 2758 product_pd(bool, RewriteBytecodes, \ 2759 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2760 \ 2761 product_pd(bool, RewriteFrequentPairs, \ 2762 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2763 \ 2764 diagnostic(bool, PrintInterpreter, false, \ 2765 "Print the generated interpreter code") \ 2766 \ 2767 product(bool, UseInterpreter, true, \ 2768 "Use interpreter for non-compiled methods") \ 2769 \ 2770 develop(bool, UseFastSignatureHandlers, true, \ 2771 "Use fast signature handlers for native calls") \ 2772 \ 2773 product(bool, UseLoopCounter, true, \ 2774 "Increment invocation counter on backward branch") \ 2775 \ 2776 product_pd(bool, UseOnStackReplacement, \ 2777 "Use on stack replacement, calls runtime if invoc. counter " \ 2778 "overflows in loop") \ 2779 \ 2780 notproduct(bool, TraceOnStackReplacement, false, \ 2781 "Trace on stack replacement") \ 2782 \ 2783 product_pd(bool, PreferInterpreterNativeStubs, \ 2784 "Use always interpreter stubs for native methods invoked via " \ 2785 "interpreter") \ 2786 \ 2787 develop(bool, CountBytecodes, false, \ 2788 "Count number of bytecodes executed") \ 2789 \ 2790 develop(bool, PrintBytecodeHistogram, false, \ 2791 "Print histogram of the executed bytecodes") \ 2792 \ 2793 develop(bool, PrintBytecodePairHistogram, false, \ 2794 "Print histogram of the executed bytecode pairs") \ 2795 \ 2796 diagnostic(bool, PrintSignatureHandlers, false, \ 2797 "Print code generated for native method signature handlers") \ 2798 \ 2799 develop(bool, VerifyOops, false, \ 2800 "Do plausibility checks for oops") \ 2801 \ 2802 develop(bool, CheckUnhandledOops, false, \ 2803 "Check for unhandled oops in VM code") \ 2804 \ 2805 develop(bool, VerifyJNIFields, trueInDebug, \ 2806 "Verify jfieldIDs for instance fields") \ 2807 \ 2808 notproduct(bool, VerifyJNIEnvThread, false, \ 2809 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2810 "from JNI") \ 2811 \ 2812 develop(bool, VerifyFPU, false, \ 2813 "Verify FPU state (check for NaN's, etc.)") \ 2814 \ 2815 develop(bool, VerifyThread, false, \ 2816 "Watch the thread register for corruption (SPARC only)") \ 2817 \ 2818 develop(bool, VerifyActivationFrameSize, false, \ 2819 "Verify that activation frame didn't become smaller than its " \ 2820 "minimal size") \ 2821 \ 2822 develop(bool, TraceFrequencyInlining, false, \ 2823 "Trace frequency based inlining") \ 2824 \ 2825 develop_pd(bool, InlineIntrinsics, \ 2826 "Inline intrinsics that can be statically resolved") \ 2827 \ 2828 product_pd(bool, ProfileInterpreter, \ 2829 "Profile at the bytecode level during interpretation") \ 2830 \ 2831 develop(bool, TraceProfileInterpreter, false, \ 2832 "Trace profiling at the bytecode level during interpretation. " \ 2833 "This outputs the profiling information collected to improve " \ 2834 "jit compilation.") \ 2835 \ 2836 develop_pd(bool, ProfileTraps, \ 2837 "Profile deoptimization traps at the bytecode level") \ 2838 \ 2839 product(intx, ProfileMaturityPercentage, 20, \ 2840 "number of method invocations/branches (expressed as % of " \ 2841 "CompileThreshold) before using the method's profile") \ 2842 \ 2843 diagnostic(bool, PrintMethodData, false, \ 2844 "Print the results of +ProfileInterpreter at end of run") \ 2845 \ 2846 develop(bool, VerifyDataPointer, trueInDebug, \ 2847 "Verify the method data pointer during interpreter profiling") \ 2848 \ 2849 develop(bool, VerifyCompiledCode, false, \ 2850 "Include miscellaneous runtime verifications in nmethod code; " \ 2851 "default off because it disturbs nmethod size heuristics") \ 2852 \ 2853 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2854 "Manually make GC thread crash then dump java stack trace; " \ 2855 "Test only") \ 2856 \ 2857 /* compilation */ \ 2858 product(bool, UseCompiler, true, \ 2859 "Use Just-In-Time compilation") \ 2860 \ 2861 develop(bool, TraceCompilationPolicy, false, \ 2862 "Trace compilation policy") \ 2863 \ 2864 develop(bool, TimeCompilationPolicy, false, \ 2865 "Time the compilation policy") \ 2866 \ 2867 product(bool, UseCounterDecay, true, \ 2868 "Adjust recompilation counters") \ 2869 \ 2870 develop(intx, CounterHalfLifeTime, 30, \ 2871 "Half-life time of invocation counters (in seconds)") \ 2872 \ 2873 develop(intx, CounterDecayMinIntervalLength, 500, \ 2874 "The minimum interval (in milliseconds) between invocation of " \ 2875 "CounterDecay") \ 2876 \ 2877 product(bool, AlwaysCompileLoopMethods, false, \ 2878 "When using recompilation, never interpret methods " \ 2879 "containing loops") \ 2880 \ 2881 product(bool, DontCompileHugeMethods, true, \ 2882 "Do not compile methods > HugeMethodLimit") \ 2883 \ 2884 /* Bytecode escape analysis estimation. */ \ 2885 product(bool, EstimateArgEscape, true, \ 2886 "Analyze bytecodes to estimate escape state of arguments") \ 2887 \ 2888 product(intx, BCEATraceLevel, 0, \ 2889 "How much tracing to do of bytecode escape analysis estimates") \ 2890 \ 2891 product(intx, MaxBCEAEstimateLevel, 5, \ 2892 "Maximum number of nested calls that are analyzed by BC EA") \ 2893 \ 2894 product(intx, MaxBCEAEstimateSize, 150, \ 2895 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2896 \ 2897 product(intx, AllocatePrefetchStyle, 1, \ 2898 "0 = no prefetch, " \ 2899 "1 = prefetch instructions for each allocation, " \ 2900 "2 = use TLAB watermark to gate allocation prefetch, " \ 2901 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2902 \ 2903 product(intx, AllocatePrefetchDistance, -1, \ 2904 "Distance to prefetch ahead of allocation pointer") \ 2905 \ 2906 product(intx, AllocatePrefetchLines, 3, \ 2907 "Number of lines to prefetch ahead of array allocation pointer") \ 2908 \ 2909 product(intx, AllocateInstancePrefetchLines, 1, \ 2910 "Number of lines to prefetch ahead of instance allocation " \ 2911 "pointer") \ 2912 \ 2913 product(intx, AllocatePrefetchStepSize, 16, \ 2914 "Step size in bytes of sequential prefetch instructions") \ 2915 \ 2916 product(intx, AllocatePrefetchInstr, 0, \ 2917 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2918 \ 2919 /* deoptimization */ \ 2920 develop(bool, TraceDeoptimization, false, \ 2921 "Trace deoptimization") \ 2922 \ 2923 develop(bool, DebugDeoptimization, false, \ 2924 "Tracing various information while debugging deoptimization") \ 2925 \ 2926 product(intx, SelfDestructTimer, 0, \ 2927 "Will cause VM to terminate after a given time (in minutes) " \ 2928 "(0 means off)") \ 2929 \ 2930 product(intx, MaxJavaStackTraceDepth, 1024, \ 2931 "The maximum number of lines in the stack trace for Java " \ 2932 "exceptions (0 means all)") \ 2933 \ 2934 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2935 "Guarantee a safepoint (at least) every so many milliseconds " \ 2936 "(0 means none)")) \ 2937 \ 2938 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2939 "Guarantee a safepoint (at least) every so many milliseconds " \ 2940 "(0 means none)")) \ 2941 \ 2942 product(intx, SafepointTimeoutDelay, 10000, \ 2943 "Delay in milliseconds for option SafepointTimeout") \ 2944 \ 2945 product(intx, NmethodSweepActivity, 10, \ 2946 "Removes cold nmethods from code cache if > 0. Higher values " \ 2947 "result in more aggressive sweeping") \ 2948 \ 2949 notproduct(bool, LogSweeper, false, \ 2950 "Keep a ring buffer of sweeper activity") \ 2951 \ 2952 notproduct(intx, SweeperLogEntries, 1024, \ 2953 "Number of records in the ring buffer of sweeper activity") \ 2954 \ 2955 notproduct(intx, MemProfilingInterval, 500, \ 2956 "Time between each invocation of the MemProfiler") \ 2957 \ 2958 develop(intx, MallocCatchPtr, -1, \ 2959 "Hit breakpoint when mallocing/freeing this pointer") \ 2960 \ 2961 notproduct(ccstrlist, SuppressErrorAt, "", \ 2962 "List of assertions (file:line) to muzzle") \ 2963 \ 2964 notproduct(size_t, HandleAllocationLimit, 1024, \ 2965 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2966 "is used") \ 2967 \ 2968 develop(size_t, TotalHandleAllocationLimit, 1024, \ 2969 "Threshold for total handle allocation when " \ 2970 "+TraceHandleAllocation is used") \ 2971 \ 2972 develop(intx, StackPrintLimit, 100, \ 2973 "number of stack frames to print in VM-level stack dump") \ 2974 \ 2975 notproduct(intx, MaxElementPrintSize, 256, \ 2976 "maximum number of elements to print") \ 2977 \ 2978 notproduct(intx, MaxSubklassPrintSize, 4, \ 2979 "maximum number of subklasses to print when printing klass") \ 2980 \ 2981 product(intx, MaxInlineLevel, 9, \ 2982 "maximum number of nested calls that are inlined") \ 2983 \ 2984 product(intx, MaxRecursiveInlineLevel, 1, \ 2985 "maximum number of nested recursive calls that are inlined") \ 2986 \ 2987 develop(intx, MaxForceInlineLevel, 100, \ 2988 "maximum number of nested calls that are forced for inlining " \ 2989 "(using CompilerOracle or marked w/ @ForceInline)") \ 2990 \ 2991 product_pd(intx, InlineSmallCode, \ 2992 "Only inline already compiled methods if their code size is " \ 2993 "less than this") \ 2994 \ 2995 product(intx, MaxInlineSize, 35, \ 2996 "The maximum bytecode size of a method to be inlined") \ 2997 \ 2998 product_pd(intx, FreqInlineSize, \ 2999 "The maximum bytecode size of a frequent method to be inlined") \ 3000 \ 3001 product(intx, MaxTrivialSize, 6, \ 3002 "The maximum bytecode size of a trivial method to be inlined") \ 3003 \ 3004 product(intx, MinInliningThreshold, 250, \ 3005 "The minimum invocation count a method needs to have to be " \ 3006 "inlined") \ 3007 \ 3008 develop(intx, MethodHistogramCutoff, 100, \ 3009 "The cutoff value for method invocation histogram (+CountCalls)") \ 3010 \ 3011 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3012 "Number of interpreted methods to show in profile") \ 3013 \ 3014 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3015 "Number of compiled methods to show in profile") \ 3016 \ 3017 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3018 "Number of stub methods to show in profile") \ 3019 \ 3020 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3021 "Number of runtime stub nodes to show in profile") \ 3022 \ 3023 product(intx, ProfileIntervalsTicks, 100, \ 3024 "Number of ticks between printing of interval profile " \ 3025 "(+ProfileIntervals)") \ 3026 \ 3027 notproduct(intx, ScavengeALotInterval, 1, \ 3028 "Interval between which scavenge will occur with +ScavengeALot") \ 3029 \ 3030 notproduct(intx, FullGCALotInterval, 1, \ 3031 "Interval between which full gc will occur with +FullGCALot") \ 3032 \ 3033 notproduct(intx, FullGCALotStart, 0, \ 3034 "For which invocation to start FullGCAlot") \ 3035 \ 3036 notproduct(intx, FullGCALotDummies, 32*K, \ 3037 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3038 "to move") \ 3039 \ 3040 develop(intx, DontYieldALotInterval, 10, \ 3041 "Interval between which yields will be dropped (milliseconds)") \ 3042 \ 3043 develop(intx, MinSleepInterval, 1, \ 3044 "Minimum sleep() interval (milliseconds) when " \ 3045 "ConvertSleepToYield is off (used for Solaris)") \ 3046 \ 3047 develop(intx, ProfilerPCTickThreshold, 15, \ 3048 "Number of ticks in a PC buckets to be a hotspot") \ 3049 \ 3050 notproduct(intx, DeoptimizeALotInterval, 5, \ 3051 "Number of exits until DeoptimizeALot kicks in") \ 3052 \ 3053 notproduct(intx, ZombieALotInterval, 5, \ 3054 "Number of exits until ZombieALot kicks in") \ 3055 \ 3056 diagnostic(intx, MallocVerifyInterval, 0, \ 3057 "If non-zero, verify C heap after every N calls to " \ 3058 "malloc/realloc/free") \ 3059 \ 3060 diagnostic(intx, MallocVerifyStart, 0, \ 3061 "If non-zero, start verifying C heap after Nth call to " \ 3062 "malloc/realloc/free") \ 3063 \ 3064 diagnostic(uintx, MallocMaxTestWords, 0, \ 3065 "If non-zero, maximum number of words that malloc/realloc can " \ 3066 "allocate (for testing only)") \ 3067 \ 3068 product(intx, TypeProfileWidth, 2, \ 3069 "Number of receiver types to record in call/cast profile") \ 3070 \ 3071 develop(intx, BciProfileWidth, 2, \ 3072 "Number of return bci's to record in ret profile") \ 3073 \ 3074 product(intx, PerMethodRecompilationCutoff, 400, \ 3075 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3076 \ 3077 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3078 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3079 \ 3080 product(intx, PerMethodTrapLimit, 100, \ 3081 "Limit on traps (of one kind) in a method (includes inlines)") \ 3082 \ 3083 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3084 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3085 \ 3086 product(intx, PerBytecodeTrapLimit, 4, \ 3087 "Limit on traps (of one kind) at a particular BCI") \ 3088 \ 3089 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3090 "Extra method data trap entries for speculation") \ 3091 \ 3092 develop(intx, InlineFrequencyRatio, 20, \ 3093 "Ratio of call site execution to caller method invocation") \ 3094 \ 3095 develop_pd(intx, InlineFrequencyCount, \ 3096 "Count of call site execution necessary to trigger frequent " \ 3097 "inlining") \ 3098 \ 3099 develop(intx, InlineThrowCount, 50, \ 3100 "Force inlining of interpreted methods that throw this often") \ 3101 \ 3102 develop(intx, InlineThrowMaxSize, 200, \ 3103 "Force inlining of throwing methods smaller than this") \ 3104 \ 3105 develop(intx, ProfilerNodeSize, 1024, \ 3106 "Size in K to allocate for the Profile Nodes of each thread") \ 3107 \ 3108 product_pd(intx, PreInflateSpin, \ 3109 "Number of times to spin wait before inflation") \ 3110 \ 3111 /* gc parameters */ \ 3112 product(size_t, InitialHeapSize, 0, \ 3113 "Initial heap size (in bytes); zero means use ergonomics") \ 3114 \ 3115 product(size_t, MaxHeapSize, ScaleForWordSize(96*M), \ 3116 "Maximum heap size (in bytes)") \ 3117 \ 3118 product(size_t, OldSize, ScaleForWordSize(4*M), \ 3119 "Initial tenured generation size (in bytes)") \ 3120 \ 3121 product(size_t, NewSize, ScaleForWordSize(1*M), \ 3122 "Initial new generation size (in bytes)") \ 3123 \ 3124 product(size_t, MaxNewSize, max_uintx, \ 3125 "Maximum new generation size (in bytes), max_uintx means set " \ 3126 "ergonomically") \ 3127 \ 3128 product(size_t, PretenureSizeThreshold, 0, \ 3129 "Maximum size in bytes of objects allocated in DefNew " \ 3130 "generation; zero means no maximum") \ 3131 \ 3132 product(size_t, TLABSize, 0, \ 3133 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3134 \ 3135 product(size_t, MinTLABSize, 2*K, \ 3136 "Minimum allowed TLAB size (in bytes)") \ 3137 \ 3138 product(uintx, TLABAllocationWeight, 35, \ 3139 "Allocation averaging weight") \ 3140 \ 3141 product(uintx, TLABWasteTargetPercent, 1, \ 3142 "Percentage of Eden that can be wasted") \ 3143 \ 3144 product(uintx, TLABRefillWasteFraction, 64, \ 3145 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3146 \ 3147 product(uintx, TLABWasteIncrement, 4, \ 3148 "Increment allowed waste at slow allocation") \ 3149 \ 3150 product(uintx, SurvivorRatio, 8, \ 3151 "Ratio of eden/survivor space size") \ 3152 \ 3153 product(uintx, NewRatio, 2, \ 3154 "Ratio of old/new generation sizes") \ 3155 \ 3156 product_pd(size_t, NewSizeThreadIncrease, \ 3157 "Additional size added to desired new generation size per " \ 3158 "non-daemon thread (in bytes)") \ 3159 \ 3160 product_pd(size_t, MetaspaceSize, \ 3161 "Initial size of Metaspaces (in bytes)") \ 3162 \ 3163 product(size_t, MaxMetaspaceSize, max_uintx, \ 3164 "Maximum size of Metaspaces (in bytes)") \ 3165 \ 3166 product(size_t, CompressedClassSpaceSize, 1*G, \ 3167 "Maximum size of class area in Metaspace when compressed " \ 3168 "class pointers are used") \ 3169 \ 3170 manageable(uintx, MinHeapFreeRatio, 40, \ 3171 "The minimum percentage of heap free after GC to avoid expansion."\ 3172 " For most GCs this applies to the old generation. In G1 and" \ 3173 " ParallelGC it applies to the whole heap.") \ 3174 \ 3175 manageable(uintx, MaxHeapFreeRatio, 70, \ 3176 "The maximum percentage of heap free after GC to avoid shrinking."\ 3177 " For most GCs this applies to the old generation. In G1 and" \ 3178 " ParallelGC it applies to the whole heap.") \ 3179 \ 3180 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3181 "Number of milliseconds per MB of free space in the heap") \ 3182 \ 3183 product(size_t, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3184 "The minimum change in heap space due to GC (in bytes)") \ 3185 \ 3186 product(size_t, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3187 "The minimum expansion of Metaspace (in bytes)") \ 3188 \ 3189 product(uintx, MinMetaspaceFreeRatio, 40, \ 3190 "The minimum percentage of Metaspace free after GC to avoid " \ 3191 "expansion") \ 3192 \ 3193 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3194 "The maximum percentage of Metaspace free after GC to avoid " \ 3195 "shrinking") \ 3196 \ 3197 product(size_t, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3198 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3199 \ 3200 product(uintx, QueuedAllocationWarningCount, 0, \ 3201 "Number of times an allocation that queues behind a GC " \ 3202 "will retry before printing a warning") \ 3203 \ 3204 diagnostic(uintx, VerifyGCStartAt, 0, \ 3205 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3206 \ 3207 diagnostic(intx, VerifyGCLevel, 0, \ 3208 "Generation level at which to start +VerifyBefore/AfterGC") \ 3209 \ 3210 product(uintx, MaxTenuringThreshold, 15, \ 3211 "Maximum value for tenuring threshold") \ 3212 \ 3213 product(uintx, InitialTenuringThreshold, 7, \ 3214 "Initial value for tenuring threshold") \ 3215 \ 3216 product(uintx, TargetSurvivorRatio, 50, \ 3217 "Desired percentage of survivor space used after scavenge") \ 3218 \ 3219 product(uintx, MarkSweepDeadRatio, 5, \ 3220 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3221 "Serial mark sweep treats this as both the minimum and maximum " \ 3222 "value. " \ 3223 "CMS uses this value only if it falls back to mark sweep. " \ 3224 "Par compact uses a variable scale based on the density of the " \ 3225 "generation and treats this as the maximum value when the heap " \ 3226 "is either completely full or completely empty. Par compact " \ 3227 "also has a smaller default value; see arguments.cpp.") \ 3228 \ 3229 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3230 "How often should we fully compact the heap (ignoring the dead " \ 3231 "space parameters)") \ 3232 \ 3233 product(intx, PrintCMSStatistics, 0, \ 3234 "Statistics for CMS") \ 3235 \ 3236 product(bool, PrintCMSInitiationStatistics, false, \ 3237 "Statistics for initiating a CMS collection") \ 3238 \ 3239 product(intx, PrintFLSStatistics, 0, \ 3240 "Statistics for CMS' FreeListSpace") \ 3241 \ 3242 product(intx, PrintFLSCensus, 0, \ 3243 "Census for CMS' FreeListSpace") \ 3244 \ 3245 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3246 "Delay between expansion and allocation (in milliseconds)") \ 3247 \ 3248 develop(uintx, GCWorkerDelayMillis, 0, \ 3249 "Delay in scheduling GC workers (in milliseconds)") \ 3250 \ 3251 product(intx, DeferThrSuspendLoopCount, 4000, \ 3252 "(Unstable) Number of times to iterate in safepoint loop " \ 3253 "before blocking VM threads ") \ 3254 \ 3255 product(intx, DeferPollingPageLoopCount, -1, \ 3256 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3257 "before changing safepoint polling page to RO ") \ 3258 \ 3259 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3260 \ 3261 product(bool, PSChunkLargeArrays, true, \ 3262 "Process large arrays in chunks") \ 3263 \ 3264 product(uintx, GCDrainStackTargetSize, 64, \ 3265 "Number of entries we will try to leave on the stack " \ 3266 "during parallel gc") \ 3267 \ 3268 /* stack parameters */ \ 3269 product_pd(intx, StackYellowPages, \ 3270 "Number of yellow zone (recoverable overflows) pages") \ 3271 \ 3272 product_pd(intx, StackRedPages, \ 3273 "Number of red zone (unrecoverable overflows) pages") \ 3274 \ 3275 product_pd(intx, StackShadowPages, \ 3276 "Number of shadow zone (for overflow checking) pages " \ 3277 "this should exceed the depth of the VM and native call stack") \ 3278 \ 3279 product_pd(intx, ThreadStackSize, \ 3280 "Thread Stack Size (in Kbytes)") \ 3281 \ 3282 product_pd(intx, VMThreadStackSize, \ 3283 "Non-Java Thread Stack Size (in Kbytes)") \ 3284 \ 3285 product_pd(intx, CompilerThreadStackSize, \ 3286 "Compiler Thread Stack Size (in Kbytes)") \ 3287 \ 3288 develop_pd(size_t, JVMInvokeMethodSlack, \ 3289 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3290 \ 3291 product(size_t, ThreadSafetyMargin, 50*M, \ 3292 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3293 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3294 "disable this feature") \ 3295 \ 3296 /* code cache parameters */ \ 3297 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3298 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3299 "Code cache segment size (in bytes) - smallest unit of " \ 3300 "allocation") \ 3301 \ 3302 develop_pd(intx, CodeEntryAlignment, \ 3303 "Code entry alignment for generated code (in bytes)") \ 3304 \ 3305 product_pd(intx, OptoLoopAlignment, \ 3306 "Align inner loops to zero relative to this modulus") \ 3307 \ 3308 product_pd(uintx, InitialCodeCacheSize, \ 3309 "Initial code cache size (in bytes)") \ 3310 \ 3311 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3312 "Minimum code cache size (in bytes) required to start VM.") \ 3313 \ 3314 product(bool, SegmentedCodeCache, false, \ 3315 "Use a segmented code cache") \ 3316 \ 3317 product_pd(uintx, ReservedCodeCacheSize, \ 3318 "Reserved code cache size (in bytes) - maximum code cache size") \ 3319 \ 3320 product_pd(uintx, NonProfiledCodeHeapSize, \ 3321 "Size of code heap with non-profiled methods (in bytes)") \ 3322 \ 3323 product_pd(uintx, ProfiledCodeHeapSize, \ 3324 "Size of code heap with profiled methods (in bytes)") \ 3325 \ 3326 product_pd(uintx, NonNMethodCodeHeapSize, \ 3327 "Size of code heap with non-nmethods (in bytes)") \ 3328 \ 3329 product_pd(uintx, CodeCacheExpansionSize, \ 3330 "Code cache expansion size (in bytes)") \ 3331 \ 3332 develop_pd(uintx, CodeCacheMinBlockLength, \ 3333 "Minimum number of segments in a code cache block") \ 3334 \ 3335 notproduct(bool, ExitOnFullCodeCache, false, \ 3336 "Exit the VM if we fill the code cache") \ 3337 \ 3338 product(bool, UseCodeCacheFlushing, true, \ 3339 "Remove cold/old nmethods from the code cache") \ 3340 \ 3341 product(uintx, StartAggressiveSweepingAt, 10, \ 3342 "Start aggressive sweeping if X[%] of the code cache is free." \ 3343 "Segmented code cache: X[%] of the non-profiled heap." \ 3344 "Non-segmented code cache: X[%] of the total code cache") \ 3345 \ 3346 /* interpreter debugging */ \ 3347 develop(intx, BinarySwitchThreshold, 5, \ 3348 "Minimal number of lookupswitch entries for rewriting to binary " \ 3349 "switch") \ 3350 \ 3351 develop(intx, StopInterpreterAt, 0, \ 3352 "Stop interpreter execution at specified bytecode number") \ 3353 \ 3354 develop(intx, TraceBytecodesAt, 0, \ 3355 "Trace bytecodes starting with specified bytecode number") \ 3356 \ 3357 /* compiler interface */ \ 3358 develop(intx, CIStart, 0, \ 3359 "The id of the first compilation to permit") \ 3360 \ 3361 develop(intx, CIStop, max_jint, \ 3362 "The id of the last compilation to permit") \ 3363 \ 3364 develop(intx, CIStartOSR, 0, \ 3365 "The id of the first osr compilation to permit " \ 3366 "(CICountOSR must be on)") \ 3367 \ 3368 develop(intx, CIStopOSR, max_jint, \ 3369 "The id of the last osr compilation to permit " \ 3370 "(CICountOSR must be on)") \ 3371 \ 3372 develop(intx, CIBreakAtOSR, -1, \ 3373 "The id of osr compilation to break at") \ 3374 \ 3375 develop(intx, CIBreakAt, -1, \ 3376 "The id of compilation to break at") \ 3377 \ 3378 product(ccstrlist, CompileOnly, "", \ 3379 "List of methods (pkg/class.name) to restrict compilation to") \ 3380 \ 3381 product(ccstr, CompileCommandFile, NULL, \ 3382 "Read compiler commands from this file [.hotspot_compiler]") \ 3383 \ 3384 product(ccstrlist, CompileCommand, "", \ 3385 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3386 \ 3387 develop(bool, ReplayCompiles, false, \ 3388 "Enable replay of compilations from ReplayDataFile") \ 3389 \ 3390 product(ccstr, ReplayDataFile, NULL, \ 3391 "File containing compilation replay information" \ 3392 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3393 \ 3394 product(ccstr, InlineDataFile, NULL, \ 3395 "File containing inlining replay information" \ 3396 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3397 \ 3398 develop(intx, ReplaySuppressInitializers, 2, \ 3399 "Control handling of class initialization during replay: " \ 3400 "0 - don't do anything special; " \ 3401 "1 - treat all class initializers as empty; " \ 3402 "2 - treat class initializers for application classes as empty; " \ 3403 "3 - allow all class initializers to run during bootstrap but " \ 3404 " pretend they are empty after starting replay") \ 3405 \ 3406 develop(bool, ReplayIgnoreInitErrors, false, \ 3407 "Ignore exceptions thrown during initialization for replay") \ 3408 \ 3409 product(bool, DumpReplayDataOnError, true, \ 3410 "Record replay data for crashing compiler threads") \ 3411 \ 3412 product(bool, CICompilerCountPerCPU, false, \ 3413 "1 compiler thread for log(N CPUs)") \ 3414 \ 3415 develop(intx, CIFireOOMAt, -1, \ 3416 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3417 "(non-negative value throws OOM after this many CI accesses " \ 3418 "in each compile)") \ 3419 notproduct(intx, CICrashAt, -1, \ 3420 "id of compilation to trigger assert in compiler thread for " \ 3421 "the purpose of testing, e.g. generation of replay data") \ 3422 notproduct(bool, CIObjectFactoryVerify, false, \ 3423 "enable potentially expensive verification in ciObjectFactory") \ 3424 \ 3425 /* Priorities */ \ 3426 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3427 \ 3428 product(intx, ThreadPriorityPolicy, 0, \ 3429 "0 : Normal. "\ 3430 " VM chooses priorities that are appropriate for normal "\ 3431 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3432 " to normal native priority. Java priorities below " \ 3433 " NORM_PRIORITY map to lower native priority values. On "\ 3434 " Windows applications are allowed to use higher native "\ 3435 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3436 " not use the highest possible native priority, "\ 3437 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3438 " system threads. On Linux thread priorities are ignored "\ 3439 " because the OS does not support static priority in "\ 3440 " SCHED_OTHER scheduling class which is the only choice for "\ 3441 " non-root, non-realtime applications. "\ 3442 "1 : Aggressive. "\ 3443 " Java thread priorities map over to the entire range of "\ 3444 " native thread priorities. Higher Java thread priorities map "\ 3445 " to higher native thread priorities. This policy should be "\ 3446 " used with care, as sometimes it can cause performance "\ 3447 " degradation in the application and/or the entire system. On "\ 3448 " Linux this policy requires root privilege.") \ 3449 \ 3450 product(bool, ThreadPriorityVerbose, false, \ 3451 "Print priority changes") \ 3452 \ 3453 product(intx, DefaultThreadPriority, -1, \ 3454 "The native priority at which threads run if not elsewhere " \ 3455 "specified (-1 means no change)") \ 3456 \ 3457 product(intx, CompilerThreadPriority, -1, \ 3458 "The native priority at which compiler threads should run " \ 3459 "(-1 means no change)") \ 3460 \ 3461 product(intx, VMThreadPriority, -1, \ 3462 "The native priority at which the VM thread should run " \ 3463 "(-1 means no change)") \ 3464 \ 3465 product(bool, CompilerThreadHintNoPreempt, true, \ 3466 "(Solaris only) Give compiler threads an extra quanta") \ 3467 \ 3468 product(bool, VMThreadHintNoPreempt, false, \ 3469 "(Solaris only) Give VM thread an extra quanta") \ 3470 \ 3471 product(intx, JavaPriority1_To_OSPriority, -1, \ 3472 "Map Java priorities to OS priorities") \ 3473 \ 3474 product(intx, JavaPriority2_To_OSPriority, -1, \ 3475 "Map Java priorities to OS priorities") \ 3476 \ 3477 product(intx, JavaPriority3_To_OSPriority, -1, \ 3478 "Map Java priorities to OS priorities") \ 3479 \ 3480 product(intx, JavaPriority4_To_OSPriority, -1, \ 3481 "Map Java priorities to OS priorities") \ 3482 \ 3483 product(intx, JavaPriority5_To_OSPriority, -1, \ 3484 "Map Java priorities to OS priorities") \ 3485 \ 3486 product(intx, JavaPriority6_To_OSPriority, -1, \ 3487 "Map Java priorities to OS priorities") \ 3488 \ 3489 product(intx, JavaPriority7_To_OSPriority, -1, \ 3490 "Map Java priorities to OS priorities") \ 3491 \ 3492 product(intx, JavaPriority8_To_OSPriority, -1, \ 3493 "Map Java priorities to OS priorities") \ 3494 \ 3495 product(intx, JavaPriority9_To_OSPriority, -1, \ 3496 "Map Java priorities to OS priorities") \ 3497 \ 3498 product(intx, JavaPriority10_To_OSPriority,-1, \ 3499 "Map Java priorities to OS priorities") \ 3500 \ 3501 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3502 "Java thread priority 10 maps to critical scheduling priority") \ 3503 \ 3504 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3505 "Compiler thread(s) run at critical scheduling priority") \ 3506 \ 3507 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3508 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3509 \ 3510 /* compiler debugging */ \ 3511 notproduct(intx, CompileTheWorldStartAt, 1, \ 3512 "First class to consider when using +CompileTheWorld") \ 3513 \ 3514 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3515 "Last class to consider when using +CompileTheWorld") \ 3516 \ 3517 develop(intx, NewCodeParameter, 0, \ 3518 "Testing Only: Create a dedicated integer parameter before " \ 3519 "putback") \ 3520 \ 3521 /* new oopmap storage allocation */ \ 3522 develop(intx, MinOopMapAllocation, 8, \ 3523 "Minimum number of OopMap entries in an OopMapSet") \ 3524 \ 3525 /* Background Compilation */ \ 3526 develop(intx, LongCompileThreshold, 50, \ 3527 "Used with +TraceLongCompiles") \ 3528 \ 3529 product(intx, StarvationMonitorInterval, 200, \ 3530 "Pause between each check (in milliseconds)") \ 3531 \ 3532 /* recompilation */ \ 3533 product_pd(intx, CompileThreshold, \ 3534 "number of interpreted method invocations before (re-)compiling") \ 3535 \ 3536 product(double, CompileThresholdScaling, 1.0, \ 3537 "Factor to control when first compilation happens " \ 3538 "(both with and without tiered compilation): " \ 3539 "values greater than 1.0 delay counter overflow, " \ 3540 "values between 0 and 1.0 rush counter overflow, " \ 3541 "value of 1.0 leaves compilation thresholds unchanged " \ 3542 "value of 0.0 is equivalent to -Xint. " \ 3543 "" \ 3544 "Flag can be set as per-method option. " \ 3545 "If a value is specified for a method, compilation thresholds " \ 3546 "for that method are scaled by both the value of the global flag "\ 3547 "and the value of the per-method flag.") \ 3548 \ 3549 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3550 "Interpreter (tier 0) invocation notification frequency") \ 3551 \ 3552 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3553 "C1 without MDO (tier 2) invocation notification frequency") \ 3554 \ 3555 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3556 "C1 with MDO profiling (tier 3) invocation notification " \ 3557 "frequency") \ 3558 \ 3559 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3560 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3561 \ 3562 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3563 "Interpreter (tier 0) invocation notification frequency") \ 3564 \ 3565 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3566 "C1 without MDO (tier 2) invocation notification frequency") \ 3567 \ 3568 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3569 "C1 with MDO profiling (tier 3) invocation notification " \ 3570 "frequency") \ 3571 \ 3572 product(intx, Tier2CompileThreshold, 0, \ 3573 "threshold at which tier 2 compilation is invoked") \ 3574 \ 3575 product(intx, Tier2BackEdgeThreshold, 0, \ 3576 "Back edge threshold at which tier 2 compilation is invoked") \ 3577 \ 3578 product(intx, Tier3InvocationThreshold, 200, \ 3579 "Compile if number of method invocations crosses this " \ 3580 "threshold") \ 3581 \ 3582 product(intx, Tier3MinInvocationThreshold, 100, \ 3583 "Minimum invocation to compile at tier 3") \ 3584 \ 3585 product(intx, Tier3CompileThreshold, 2000, \ 3586 "Threshold at which tier 3 compilation is invoked (invocation " \ 3587 "minimum must be satisfied") \ 3588 \ 3589 product(intx, Tier3BackEdgeThreshold, 60000, \ 3590 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3591 \ 3592 product(intx, Tier4InvocationThreshold, 5000, \ 3593 "Compile if number of method invocations crosses this " \ 3594 "threshold") \ 3595 \ 3596 product(intx, Tier4MinInvocationThreshold, 600, \ 3597 "Minimum invocation to compile at tier 4") \ 3598 \ 3599 product(intx, Tier4CompileThreshold, 15000, \ 3600 "Threshold at which tier 4 compilation is invoked (invocation " \ 3601 "minimum must be satisfied") \ 3602 \ 3603 product(intx, Tier4BackEdgeThreshold, 40000, \ 3604 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3605 \ 3606 product(intx, Tier3DelayOn, 5, \ 3607 "If C2 queue size grows over this amount per compiler thread " \ 3608 "stop compiling at tier 3 and start compiling at tier 2") \ 3609 \ 3610 product(intx, Tier3DelayOff, 2, \ 3611 "If C2 queue size is less than this amount per compiler thread " \ 3612 "allow methods compiled at tier 2 transition to tier 3") \ 3613 \ 3614 product(intx, Tier3LoadFeedback, 5, \ 3615 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3616 "reaches this amount per compiler thread") \ 3617 \ 3618 product(intx, Tier4LoadFeedback, 3, \ 3619 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3620 "reaches this amount per compiler thread") \ 3621 \ 3622 product(intx, TieredCompileTaskTimeout, 50, \ 3623 "Kill compile task if method was not used within " \ 3624 "given timeout in milliseconds") \ 3625 \ 3626 product(intx, TieredStopAtLevel, 4, \ 3627 "Stop at given compilation level") \ 3628 \ 3629 product(intx, Tier0ProfilingStartPercentage, 200, \ 3630 "Start profiling in interpreter if the counters exceed tier 3 " \ 3631 "thresholds by the specified percentage") \ 3632 \ 3633 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3634 "Increase the compile threshold for C1 compilation if the code " \ 3635 "cache is filled by the specified percentage") \ 3636 \ 3637 product(intx, TieredRateUpdateMinTime, 1, \ 3638 "Minimum rate sampling interval (in milliseconds)") \ 3639 \ 3640 product(intx, TieredRateUpdateMaxTime, 25, \ 3641 "Maximum rate sampling interval (in milliseconds)") \ 3642 \ 3643 product_pd(bool, TieredCompilation, \ 3644 "Enable tiered compilation") \ 3645 \ 3646 product(bool, PrintTieredEvents, false, \ 3647 "Print tiered events notifications") \ 3648 \ 3649 product_pd(intx, OnStackReplacePercentage, \ 3650 "NON_TIERED number of method invocations/branches (expressed as " \ 3651 "% of CompileThreshold) before (re-)compiling OSR code") \ 3652 \ 3653 product(intx, InterpreterProfilePercentage, 33, \ 3654 "NON_TIERED number of method invocations/branches (expressed as " \ 3655 "% of CompileThreshold) before profiling in the interpreter") \ 3656 \ 3657 develop(intx, MaxRecompilationSearchLength, 10, \ 3658 "The maximum number of frames to inspect when searching for " \ 3659 "recompilee") \ 3660 \ 3661 develop(intx, MaxInterpretedSearchLength, 3, \ 3662 "The maximum number of interpreted frames to skip when searching "\ 3663 "for recompilee") \ 3664 \ 3665 develop(intx, DesiredMethodLimit, 8000, \ 3666 "The desired maximum method size (in bytecodes) after inlining") \ 3667 \ 3668 develop(intx, HugeMethodLimit, 8000, \ 3669 "Don't compile methods larger than this if " \ 3670 "+DontCompileHugeMethods") \ 3671 \ 3672 /* New JDK 1.4 reflection implementation */ \ 3673 \ 3674 develop(intx, FastSuperclassLimit, 8, \ 3675 "Depth of hardwired instanceof accelerator array") \ 3676 \ 3677 /* Properties for Java libraries */ \ 3678 \ 3679 product(size_t, MaxDirectMemorySize, 0, \ 3680 "Maximum total size of NIO direct-buffer allocations") \ 3681 \ 3682 /* Flags used for temporary code during development */ \ 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 "The string %p in the file name (if present) " \ 3705 "will be replaced by pid") \ 3706 \ 3707 product(intx, PerfDataSamplingInterval, 50, \ 3708 "Data sampling interval (in milliseconds)") \ 3709 \ 3710 develop(bool, PerfTraceDataCreation, false, \ 3711 "Trace creation of Performance Data Entries") \ 3712 \ 3713 develop(bool, PerfTraceMemOps, false, \ 3714 "Trace PerfMemory create/attach/detach calls") \ 3715 \ 3716 product(bool, PerfDisableSharedMem, false, \ 3717 "Store performance data in standard memory") \ 3718 \ 3719 product(intx, PerfDataMemorySize, 32*K, \ 3720 "Size of performance data memory region. Will be rounded " \ 3721 "up to a multiple of the native os page size.") \ 3722 \ 3723 product(intx, PerfMaxStringConstLength, 1024, \ 3724 "Maximum PerfStringConstant string length before truncation") \ 3725 \ 3726 product(bool, PerfAllowAtExitRegistration, false, \ 3727 "Allow registration of atexit() methods") \ 3728 \ 3729 product(bool, PerfBypassFileSystemCheck, false, \ 3730 "Bypass Win32 file system criteria checks (Windows Only)") \ 3731 \ 3732 product(intx, UnguardOnExecutionViolation, 0, \ 3733 "Unguard page and retry on no-execute fault (Win32 only) " \ 3734 "0=off, 1=conservative, 2=aggressive") \ 3735 \ 3736 /* Serviceability Support */ \ 3737 \ 3738 product(bool, ManagementServer, false, \ 3739 "Create JMX Management Server") \ 3740 \ 3741 product(bool, DisableAttachMechanism, false, \ 3742 "Disable mechanism that allows tools to attach to this VM") \ 3743 \ 3744 product(bool, StartAttachListener, false, \ 3745 "Always start Attach Listener at VM startup") \ 3746 \ 3747 manageable(bool, PrintConcurrentLocks, false, \ 3748 "Print java.util.concurrent locks in thread dump") \ 3749 \ 3750 product(bool, TransmitErrorReport, false, \ 3751 "Enable error report transmission on erroneous termination") \ 3752 \ 3753 product(ccstr, ErrorReportServer, NULL, \ 3754 "Override built-in error report server address") \ 3755 \ 3756 /* Shared spaces */ \ 3757 \ 3758 product(bool, UseSharedSpaces, true, \ 3759 "Use shared spaces for metadata") \ 3760 \ 3761 product(bool, VerifySharedSpaces, false, \ 3762 "Verify shared spaces (false for default archive, true for " \ 3763 "archive specified by -XX:SharedArchiveFile)") \ 3764 \ 3765 product(bool, RequireSharedSpaces, false, \ 3766 "Require shared spaces for metadata") \ 3767 \ 3768 product(bool, DumpSharedSpaces, false, \ 3769 "Special mode: JVM reads a class list, loads classes, builds " \ 3770 "shared spaces, and dumps the shared spaces to a file to be " \ 3771 "used in future JVM runs") \ 3772 \ 3773 product(bool, PrintSharedSpaces, false, \ 3774 "Print usage of shared spaces") \ 3775 \ 3776 product(bool, PrintSharedArchiveAndExit, false, \ 3777 "Print shared archive file contents") \ 3778 \ 3779 product(bool, PrintSharedDictionary, false, \ 3780 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3781 "dictionary") \ 3782 \ 3783 product(size_t, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3784 "Size of read-write space for metadata (in bytes)") \ 3785 \ 3786 product(size_t, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3787 "Size of read-only space for metadata (in bytes)") \ 3788 \ 3789 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3790 "Size of the shared miscellaneous data area (in bytes)") \ 3791 \ 3792 product(uintx, SharedMiscCodeSize, 120*K, \ 3793 "Size of the shared miscellaneous code area (in bytes)") \ 3794 \ 3795 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3796 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3797 "Address to allocate shared memory region for class data") \ 3798 \ 3799 product(uintx, SharedSymbolTableBucketSize, 4, \ 3800 "Average number of symbols per bucket in shared table") \ 3801 \ 3802 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3803 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3804 "classes. Just exclude them from the shared dictionary.") \ 3805 \ 3806 diagnostic(bool, PrintMethodHandleStubs, false, \ 3807 "Print generated stub code for method handles") \ 3808 \ 3809 develop(bool, TraceMethodHandles, false, \ 3810 "trace internal method handle operations") \ 3811 \ 3812 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3813 "perform extra checks when constructing method handles") \ 3814 \ 3815 diagnostic(bool, ShowHiddenFrames, false, \ 3816 "show method handle implementation frames (usually hidden)") \ 3817 \ 3818 experimental(bool, TrustFinalNonStaticFields, false, \ 3819 "trust final non-static declarations for constant folding") \ 3820 \ 3821 diagnostic(bool, FoldStableValues, true, \ 3822 "Optimize loads from stable fields (marked w/ @Stable)") \ 3823 \ 3824 develop(bool, TraceInvokeDynamic, false, \ 3825 "trace internal invoke dynamic operations") \ 3826 \ 3827 diagnostic(bool, PauseAtStartup, false, \ 3828 "Causes the VM to pause at startup time and wait for the pause " \ 3829 "file to be removed (default: ./vm.paused.<pid>)") \ 3830 \ 3831 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3832 "The file to create and for whose removal to await when pausing " \ 3833 "at startup. (default: ./vm.paused.<pid>)") \ 3834 \ 3835 diagnostic(bool, PauseAtExit, false, \ 3836 "Pause and wait for keypress on exit if a debugger is attached") \ 3837 \ 3838 product(bool, ExtendedDTraceProbes, false, \ 3839 "Enable performance-impacting dtrace probes") \ 3840 \ 3841 product(bool, DTraceMethodProbes, false, \ 3842 "Enable dtrace probes for method-entry and method-exit") \ 3843 \ 3844 product(bool, DTraceAllocProbes, false, \ 3845 "Enable dtrace probes for object allocation") \ 3846 \ 3847 product(bool, DTraceMonitorProbes, false, \ 3848 "Enable dtrace probes for monitor events") \ 3849 \ 3850 product(bool, RelaxAccessControlCheck, false, \ 3851 "Relax the access control checks in the verifier") \ 3852 \ 3853 product(uintx, StringTableSize, defaultStringTableSize, \ 3854 "Number of buckets in the interned String table") \ 3855 \ 3856 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3857 "Number of buckets in the JVM internal Symbol table") \ 3858 \ 3859 product(bool, UseStringDeduplication, false, \ 3860 "Use string deduplication") \ 3861 \ 3862 product(bool, PrintStringDeduplicationStatistics, false, \ 3863 "Print string deduplication statistics") \ 3864 \ 3865 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3866 "A string must reach this age (or be promoted to an old region) " \ 3867 "to be considered for deduplication") \ 3868 \ 3869 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3870 "Force table resize every time the table is scanned") \ 3871 \ 3872 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3873 "Force table rehash every time the table is scanned") \ 3874 \ 3875 develop(bool, TraceDefaultMethods, false, \ 3876 "Trace the default method processing steps") \ 3877 \ 3878 develop(bool, VerifyGenericSignatures, false, \ 3879 "Abort VM on erroneous or inconsistent generic signatures") \ 3880 \ 3881 diagnostic(bool, WhiteBoxAPI, false, \ 3882 "Enable internal testing APIs") \ 3883 \ 3884 product(bool, PrintGCCause, true, \ 3885 "Include GC cause in GC logging") \ 3886 \ 3887 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3888 "Default survivor space alignment in bytes") \ 3889 \ 3890 product(bool , AllowNonVirtualCalls, false, \ 3891 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3892 \ 3893 product(ccstr, DumpLoadedClassList, NULL, \ 3894 "Dump the names all loaded classes, that could be stored into " \ 3895 "the CDS archive, in the specified file") \ 3896 \ 3897 product(ccstr, SharedClassListFile, NULL, \ 3898 "Override the default CDS class list") \ 3899 \ 3900 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3901 "Override the default location of the CDS archive file") \ 3902 \ 3903 product(ccstr, ExtraSharedClassListFile, NULL, \ 3904 "Extra classlist for building the CDS archive file") \ 3905 \ 3906 experimental(size_t, ArrayAllocatorMallocLimit, \ 3907 SOLARIS_ONLY(64*K) NOT_SOLARIS((size_t)-1), \ 3908 "Allocation less than this value will be allocated " \ 3909 "using malloc. Larger allocations will use mmap.") \ 3910 \ 3911 experimental(bool, AlwaysAtomicAccesses, false, \ 3912 "Accesses to all variables should always be atomic") \ 3913 \ 3914 product(bool, EnableTracing, false, \ 3915 "Enable event-based tracing") \ 3916 \ 3917 product(bool, UseLockedTracing, false, \ 3918 "Use locked-tracing when doing event-based tracing") \ 3919 \ 3920 diagnostic(bool, UseUnalignedAccesses, false, \ 3921 "Use unaligned memory accesses in sun.misc.Unsafe") \ 3922 \ 3923 product_pd(bool, PreserveFramePointer, \ 3924 "Use the FP register for holding the frame pointer " \ 3925 "and not as a general purpose register.") 3926 3927/* 3928 * Macros for factoring of globals 3929 */ 3930 3931// Interface macros 3932#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3933#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3934#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3935#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3936#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3937#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3938#ifdef PRODUCT 3939#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3940#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3941#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3942#else 3943#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3944#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3945#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3946#endif 3947// Special LP64 flags, product only needed for now. 3948#ifdef _LP64 3949#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3950#else 3951#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3952#endif // _LP64 3953 3954// Implementation macros 3955#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3956#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3957#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3958#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3959#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3960#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3961#ifdef PRODUCT 3962#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3963#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3964#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3965#else 3966#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3967#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3968#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3969#endif 3970#ifdef _LP64 3971#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3972#else 3973#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3974#endif // _LP64 3975 3976RUNTIME_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) 3977 3978RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3979 3980ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3981 3982// Extensions 3983 3984#include "runtime/globals_ext.hpp" 3985 3986#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3987