1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 30 // use this for flags that are true per default in the tiered build 31 // but false in non-tiered builds, and vice versa 32 #ifdef TIERED 33 #define trueInTiered true 34 #define falseInTiered false 35 #else 36 #define trueInTiered false 37 #define falseInTiered true 38 #endif 39 40 #ifdef TARGET_ARCH_x86 41 # include "globals_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_sparc 44 # include "globals_sparc.hpp" 45 #endif 46 #ifdef TARGET_ARCH_zero 47 # include "globals_zero.hpp" 48 #endif 49 #ifdef TARGET_ARCH_arm 50 # include "globals_arm.hpp" 51 #endif 52 #ifdef TARGET_ARCH_ppc 53 # include "globals_ppc.hpp" 54 #endif 55 #ifdef TARGET_OS_FAMILY_linux 56 # include "globals_linux.hpp" 57 #endif 58 #ifdef TARGET_OS_FAMILY_solaris 59 # include "globals_solaris.hpp" 60 #endif 61 #ifdef TARGET_OS_FAMILY_windows 62 # include "globals_windows.hpp" 63 #endif 64 #ifdef TARGET_OS_FAMILY_aix 65 # include "globals_aix.hpp" 66 #endif 67 #ifdef TARGET_OS_FAMILY_bsd 68 # include "globals_bsd.hpp" 69 #endif 70 #ifdef TARGET_OS_ARCH_linux_x86 71 # include "globals_linux_x86.hpp" 72 #endif 73 #ifdef TARGET_OS_ARCH_linux_sparc 74 # include "globals_linux_sparc.hpp" 75 #endif 76 #ifdef TARGET_OS_ARCH_linux_zero 77 # include "globals_linux_zero.hpp" 78 #endif 79 #ifdef TARGET_OS_ARCH_solaris_x86 80 # include "globals_solaris_x86.hpp" 81 #endif 82 #ifdef TARGET_OS_ARCH_solaris_sparc 83 # include "globals_solaris_sparc.hpp" 84 #endif 85 #ifdef TARGET_OS_ARCH_windows_x86 86 # include "globals_windows_x86.hpp" 87 #endif 88 #ifdef TARGET_OS_ARCH_linux_arm 89 # include "globals_linux_arm.hpp" 90 #endif 91 #ifdef TARGET_OS_ARCH_linux_ppc 92 # include "globals_linux_ppc.hpp" 93 #endif 94 #ifdef TARGET_OS_ARCH_aix_ppc 95 # include "globals_aix_ppc.hpp" 96 #endif 97 #ifdef TARGET_OS_ARCH_bsd_x86 98 # include "globals_bsd_x86.hpp" 99 #endif 100 #ifdef TARGET_OS_ARCH_bsd_zero 101 # include "globals_bsd_zero.hpp" 102 #endif 103 #ifdef COMPILER1 104 #ifdef TARGET_ARCH_x86 105 # include "c1_globals_x86.hpp" 106 #endif 107 #ifdef TARGET_ARCH_sparc 108 # include "c1_globals_sparc.hpp" 109 #endif 110 #ifdef TARGET_ARCH_arm 111 # include "c1_globals_arm.hpp" 112 #endif 113 #ifdef TARGET_ARCH_ppc 114 # include "c1_globals_ppc.hpp" 115 #endif 116 #ifdef TARGET_OS_FAMILY_linux 117 # include "c1_globals_linux.hpp" 118 #endif 119 #ifdef TARGET_OS_FAMILY_solaris 120 # include "c1_globals_solaris.hpp" 121 #endif 122 #ifdef TARGET_OS_FAMILY_windows 123 # include "c1_globals_windows.hpp" 124 #endif 125 #ifdef TARGET_OS_FAMILY_aix 126 # include "c1_globals_aix.hpp" 127 #endif 128 #ifdef TARGET_OS_FAMILY_bsd 129 # include "c1_globals_bsd.hpp" 130 #endif 131 #endif 132 #ifdef COMPILER2 133 #ifdef TARGET_ARCH_x86 134 # include "c2_globals_x86.hpp" 135 #endif 136 #ifdef TARGET_ARCH_sparc 137 # include "c2_globals_sparc.hpp" 138 #endif 139 #ifdef TARGET_ARCH_arm 140 # include "c2_globals_arm.hpp" 141 #endif 142 #ifdef TARGET_ARCH_ppc 143 # include "c2_globals_ppc.hpp" 144 #endif 145 #ifdef TARGET_OS_FAMILY_linux 146 # include "c2_globals_linux.hpp" 147 #endif 148 #ifdef TARGET_OS_FAMILY_solaris 149 # include "c2_globals_solaris.hpp" 150 #endif 151 #ifdef TARGET_OS_FAMILY_windows 152 # include "c2_globals_windows.hpp" 153 #endif 154 #ifdef TARGET_OS_FAMILY_aix 155 # include "c2_globals_aix.hpp" 156 #endif 157 #ifdef TARGET_OS_FAMILY_bsd 158 # include "c2_globals_bsd.hpp" 159 #endif 160 #endif 161 #ifdef SHARK 162 #ifdef TARGET_ARCH_zero 163 # include "shark_globals_zero.hpp" 164 #endif 165 #endif 166 167 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 168 define_pd_global(bool, BackgroundCompilation, false); 169 define_pd_global(bool, UseTLAB, false); 170 define_pd_global(bool, CICompileOSR, false); 171 define_pd_global(bool, UseTypeProfile, false); 172 define_pd_global(bool, UseOnStackReplacement, false); 173 define_pd_global(bool, InlineIntrinsics, false); 174 define_pd_global(bool, PreferInterpreterNativeStubs, true); 175 define_pd_global(bool, ProfileInterpreter, false); 176 define_pd_global(bool, ProfileTraps, false); 177 define_pd_global(bool, TieredCompilation, false); 178 179 define_pd_global(intx, CompileThreshold, 0); 180 define_pd_global(intx, BackEdgeThreshold, 0); 181 182 define_pd_global(intx, OnStackReplacePercentage, 0); 183 define_pd_global(bool, ResizeTLAB, false); 184 define_pd_global(intx, FreqInlineSize, 0); 185 define_pd_global(intx, NewSizeThreadIncrease, 4*K); 186 define_pd_global(intx, InlineClassNatives, true); 187 define_pd_global(intx, InlineUnsafeOps, true); 188 define_pd_global(intx, InitialCodeCacheSize, 160*K); 189 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 190 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 191 define_pd_global(intx, CodeCacheMinBlockLength, 1); 192 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 193 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 194 define_pd_global(bool, NeverActAsServerClassMachine, true); 195 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 196 #define CI_COMPILER_COUNT 0 197 #else 198 199 #ifdef COMPILER2 200 #define CI_COMPILER_COUNT 2 201 #else 202 #define CI_COMPILER_COUNT 1 203 #endif // COMPILER2 204 205 #endif // no compilers 206 207 // string type aliases used only in this file 208 typedef const char* ccstr; 209 typedef const char* ccstrlist; // represents string arguments which accumulate 210 211 struct Flag { 212 enum Flags { 213 // value origin 214 DEFAULT = 0, 215 COMMAND_LINE = 1, 216 ENVIRON_VAR = 2, 217 CONFIG_FILE = 3, 218 MANAGEMENT = 4, 219 ERGONOMIC = 5, 220 ATTACH_ON_DEMAND = 6, 221 INTERNAL = 7, 222 223 LAST_VALUE_ORIGIN = INTERNAL, 224 VALUE_ORIGIN_BITS = 4, 225 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 226 227 // flag kind 228 KIND_PRODUCT = 1 << 4, 229 KIND_MANAGEABLE = 1 << 5, 230 KIND_DIAGNOSTIC = 1 << 6, 231 KIND_EXPERIMENTAL = 1 << 7, 232 KIND_NOT_PRODUCT = 1 << 8, 233 KIND_DEVELOP = 1 << 9, 234 KIND_PLATFORM_DEPENDENT = 1 << 10, 235 KIND_READ_WRITE = 1 << 11, 236 KIND_C1 = 1 << 12, 237 KIND_C2 = 1 << 13, 238 KIND_ARCH = 1 << 14, 239 KIND_SHARK = 1 << 15, 240 KIND_LP64_PRODUCT = 1 << 16, 241 KIND_COMMERCIAL = 1 << 17, 242 243 KIND_MASK = ~VALUE_ORIGIN_MASK 244 }; 245 246 const char* _type; 247 const char* _name; 248 void* _addr; 249 NOT_PRODUCT(const char* _doc;) 250 Flags _flags; 251 252 // points to all Flags static array 253 static Flag* flags; 254 255 // number of flags 256 static size_t numFlags; 257 258 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 259 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 260 261 void check_writable(); 262 263 bool is_bool() const; 264 bool get_bool() const; 265 void set_bool(bool value); 266 267 bool is_intx() const; 268 intx get_intx() const; 269 void set_intx(intx value); 270 271 bool is_uintx() const; 272 uintx get_uintx() const; 273 void set_uintx(uintx value); 274 275 bool is_uint64_t() const; 276 uint64_t get_uint64_t() const; 277 void set_uint64_t(uint64_t value); 278 279 bool is_double() const; 280 double get_double() const; 281 void set_double(double value); 282 283 bool is_ccstr() const; 284 bool ccstr_accumulates() const; 285 ccstr get_ccstr() const; 286 void set_ccstr(ccstr value); 287 288 Flags get_origin(); 289 void set_origin(Flags origin); 290 291 bool is_default(); 292 bool is_ergonomic(); 293 bool is_command_line(); 294 295 bool is_product() const; 296 bool is_manageable() const; 297 bool is_diagnostic() const; 298 bool is_experimental() const; 299 bool is_notproduct() const; 300 bool is_develop() const; 301 bool is_read_write() const; 302 bool is_commercial() const; 303 304 bool is_constant_in_binary() const; 305 306 bool is_unlocker() const; 307 bool is_unlocked() const; 308 bool is_writeable() const; 309 bool is_external() const; 310 311 bool is_unlocker_ext() const; 312 bool is_unlocked_ext() const; 313 bool is_writeable_ext() const; 314 bool is_external_ext() const; 315 316 void unlock_diagnostic(); 317 318 void get_locked_message(char*, int) const; 319 void get_locked_message_ext(char*, int) const; 320 321 void print_on(outputStream* st, bool withComments = false ); 322 void print_kind(outputStream* st); 323 void print_as_flag(outputStream* st); 324 }; 325 326 // debug flags control various aspects of the VM and are global accessible 327 328 // use FlagSetting to temporarily change some debug flag 329 // e.g. FlagSetting fs(DebugThisAndThat, true); 330 // restored to previous value upon leaving scope 331 class FlagSetting { 332 bool val; 333 bool* flag; 334 public: 335 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 336 ~FlagSetting() { *flag = val; } 337 }; 338 339 340 class CounterSetting { 341 intx* counter; 342 public: 343 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 344 ~CounterSetting() { (*counter)--; } 345 }; 346 347 348 class UIntFlagSetting { 349 uintx val; 350 uintx* flag; 351 public: 352 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 353 ~UIntFlagSetting() { *flag = val; } 354 }; 355 356 357 class DoubleFlagSetting { 358 double val; 359 double* flag; 360 public: 361 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 362 ~DoubleFlagSetting() { *flag = val; } 363 }; 364 365 366 class CommandLineFlags { 367 public: 368 static bool boolAt(const char* name, size_t len, bool* value); 369 static bool boolAt(const char* name, bool* value) { return boolAt(name, strlen(name), value); } 370 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 371 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 372 373 static bool intxAt(const char* name, size_t len, intx* value); 374 static bool intxAt(const char* name, intx* value) { return intxAt(name, strlen(name), value); } 375 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 376 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 377 378 static bool uintxAt(const char* name, size_t len, uintx* value); 379 static bool uintxAt(const char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 380 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 381 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 382 383 static bool uint64_tAt(const char* name, size_t len, uint64_t* value); 384 static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 385 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 386 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 387 388 static bool doubleAt(const char* name, size_t len, double* value); 389 static bool doubleAt(const char* name, double* value) { return doubleAt(name, strlen(name), value); } 390 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 391 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 392 393 static bool ccstrAt(const char* name, size_t len, ccstr* value); 394 static bool ccstrAt(const char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 395 // Contract: Flag will make private copy of the incoming value. 396 // Outgoing value is always malloc-ed, and caller MUST call free. 397 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 398 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 399 400 // Returns false if name is not a command line flag. 401 static bool wasSetOnCmdline(const char* name, bool* value); 402 static void printSetFlags(outputStream* out); 403 404 static void printFlags(outputStream* out, bool withComments); 405 406 static void verify() PRODUCT_RETURN; 407 }; 408 409 // use this for flags that are true by default in the debug version but 410 // false in the optimized version, and vice versa 411 #ifdef ASSERT 412 #define trueInDebug true 413 #define falseInDebug false 414 #else 415 #define trueInDebug false 416 #define falseInDebug true 417 #endif 418 419 // use this for flags that are true per default in the product build 420 // but false in development builds, and vice versa 421 #ifdef PRODUCT 422 #define trueInProduct true 423 #define falseInProduct false 424 #else 425 #define trueInProduct false 426 #define falseInProduct true 427 #endif 428 429 #ifdef JAVASE_EMBEDDED 430 #define falseInEmbedded false 431 #else 432 #define falseInEmbedded true 433 #endif 434 435 // develop flags are settable / visible only during development and are constant in the PRODUCT version 436 // product flags are always settable / visible 437 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 438 439 // A flag must be declared with one of the following types: 440 // bool, intx, uintx, ccstr. 441 // The type "ccstr" is an alias for "const char*" and is used 442 // only in this file, because the macrology requires single-token type names. 443 444 // Note: Diagnostic options not meant for VM tuning or for product modes. 445 // They are to be used for VM quality assurance or field diagnosis 446 // of VM bugs. They are hidden so that users will not be encouraged to 447 // try them as if they were VM ordinary execution options. However, they 448 // are available in the product version of the VM. Under instruction 449 // from support engineers, VM customers can turn them on to collect 450 // diagnostic information about VM problems. To use a VM diagnostic 451 // option, you must first specify +UnlockDiagnosticVMOptions. 452 // (This master switch also affects the behavior of -Xprintflags.) 453 // 454 // experimental flags are in support of features that are not 455 // part of the officially supported product, but are available 456 // for experimenting with. They could, for example, be performance 457 // features that may not have undergone full or rigorous QA, but which may 458 // help performance in some cases and released for experimentation 459 // by the community of users and developers. This flag also allows one to 460 // be able to build a fully supported product that nonetheless also 461 // ships with some unsupported, lightly tested, experimental features. 462 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 463 // UnlockExperimentalVMOptions flag, which allows the control and 464 // modification of the experimental flags. 465 // 466 // Nota bene: neither diagnostic nor experimental options should be used casually, 467 // and they are not supported on production loads, except under explicit 468 // direction from support engineers. 469 // 470 // manageable flags are writeable external product flags. 471 // They are dynamically writeable through the JDK management interface 472 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 473 // These flags are external exported interface (see CCC). The list of 474 // manageable flags can be queried programmatically through the management 475 // interface. 476 // 477 // A flag can be made as "manageable" only if 478 // - the flag is defined in a CCC as an external exported interface. 479 // - the VM implementation supports dynamic setting of the flag. 480 // This implies that the VM must *always* query the flag variable 481 // and not reuse state related to the flag state at any given time. 482 // - you want the flag to be queried programmatically by the customers. 483 // 484 // product_rw flags are writeable internal product flags. 485 // They are like "manageable" flags but for internal/private use. 486 // The list of product_rw flags are internal/private flags which 487 // may be changed/removed in a future release. It can be set 488 // through the management interface to get/set value 489 // when the name of flag is supplied. 490 // 491 // A flag can be made as "product_rw" only if 492 // - the VM implementation supports dynamic setting of the flag. 493 // This implies that the VM must *always* query the flag variable 494 // and not reuse state related to the flag state at any given time. 495 // 496 // Note that when there is a need to support develop flags to be writeable, 497 // it can be done in the same way as product_rw. 498 499 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 500 \ 501 lp64_product(bool, UseCompressedOops, false, \ 502 "Use 32-bit object references in 64-bit VM. " \ 503 "lp64_product means flag is always constant in 32 bit VM") \ 504 \ 505 lp64_product(bool, UseCompressedClassPointers, false, \ 506 "Use 32-bit class pointers in 64-bit VM. " \ 507 "lp64_product means flag is always constant in 32 bit VM") \ 508 \ 509 notproduct(bool, CheckCompressedOops, true, \ 510 "Generate checks in encoding/decoding code in debug VM") \ 511 \ 512 product_pd(uintx, HeapBaseMinAddress, \ 513 "OS specific low limit for heap base address") \ 514 \ 515 diagnostic(bool, PrintCompressedOopsMode, false, \ 516 "Print compressed oops base address and encoding mode") \ 517 \ 518 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 519 "Default object alignment in bytes, 8 is minimum") \ 520 \ 521 product(bool, AssumeMP, false, \ 522 "Instruct the VM to assume multiple processors are available") \ 523 \ 524 /* UseMembar is theoretically a temp flag used for memory barrier \ 525 * removal testing. It was supposed to be removed before FCS but has \ 526 * been re-added (see 6401008) */ \ 527 product_pd(bool, UseMembar, \ 528 "(Unstable) Issues membars on thread state transitions") \ 529 \ 530 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 531 "Clean the chunk pool asynchronously") \ 532 \ 533 /* Temporary: See 6948537 */ \ 534 experimental(bool, UseMemSetInBOT, true, \ 535 "(Unstable) uses memset in BOT updates in GC code") \ 536 \ 537 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 538 "Enable normal processing of flags relating to field diagnostics")\ 539 \ 540 experimental(bool, UnlockExperimentalVMOptions, false, \ 541 "Enable normal processing of flags relating to experimental " \ 542 "features") \ 543 \ 544 product(bool, JavaMonitorsInStackTrace, true, \ 545 "Print information about Java monitor locks when the stacks are" \ 546 "dumped") \ 547 \ 548 product_pd(bool, UseLargePages, \ 549 "Use large page memory") \ 550 \ 551 product_pd(bool, UseLargePagesIndividualAllocation, \ 552 "Allocate large pages individually for better affinity") \ 553 \ 554 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 555 "Fail large pages individual allocation") \ 556 \ 557 product(bool, UseLargePagesInMetaspace, false, \ 558 "Use large page memory in metaspace. " \ 559 "Only used if UseLargePages is enabled.") \ 560 \ 561 develop(bool, TracePageSizes, false, \ 562 "Trace page size selection and usage") \ 563 \ 564 product(bool, UseNUMA, false, \ 565 "Use NUMA if available") \ 566 \ 567 product(bool, UseNUMAInterleaving, false, \ 568 "Interleave memory across NUMA nodes if available") \ 569 \ 570 product(uintx, NUMAInterleaveGranularity, 2*M, \ 571 "Granularity to use for NUMA interleaving on Windows OS") \ 572 \ 573 product(bool, ForceNUMA, false, \ 574 "Force NUMA optimizations on single-node/UMA systems") \ 575 \ 576 product(uintx, NUMAChunkResizeWeight, 20, \ 577 "Percentage (0-100) used to weigh the current sample when " \ 578 "computing exponentially decaying average for " \ 579 "AdaptiveNUMAChunkSizing") \ 580 \ 581 product(uintx, NUMASpaceResizeRate, 1*G, \ 582 "Do not reallocate more than this amount per collection") \ 583 \ 584 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 585 "Enable adaptive chunk sizing for NUMA") \ 586 \ 587 product(bool, NUMAStats, false, \ 588 "Print NUMA stats in detailed heap information") \ 589 \ 590 product(uintx, NUMAPageScanRate, 256, \ 591 "Maximum number of pages to include in the page scan procedure") \ 592 \ 593 product_pd(bool, NeedsDeoptSuspend, \ 594 "True for register window machines (sparc/ia64)") \ 595 \ 596 product(intx, UseSSE, 99, \ 597 "Highest supported SSE instructions set on x86/x64") \ 598 \ 599 product(bool, UseAES, false, \ 600 "Control whether AES instructions can be used on x86/x64") \ 601 \ 602 product(bool, UseSHA, false, \ 603 "Control whether SHA instructions can be used on SPARC") \ 604 \ 605 product(uintx, LargePageSizeInBytes, 0, \ 606 "Large page size (0 to let VM choose the page size)") \ 607 \ 608 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 609 "Use large pages if maximum heap is at least this big") \ 610 \ 611 product(bool, ForceTimeHighResolution, false, \ 612 "Using high time resolution (for Win32 only)") \ 613 \ 614 develop(bool, TraceItables, false, \ 615 "Trace initialization and use of itables") \ 616 \ 617 develop(bool, TracePcPatching, false, \ 618 "Trace usage of frame::patch_pc") \ 619 \ 620 develop(bool, TraceJumps, false, \ 621 "Trace assembly jumps in thread ring buffer") \ 622 \ 623 develop(bool, TraceRelocator, false, \ 624 "Trace the bytecode relocator") \ 625 \ 626 develop(bool, TraceLongCompiles, false, \ 627 "Print out every time compilation is longer than " \ 628 "a given threshold") \ 629 \ 630 develop(bool, SafepointALot, false, \ 631 "Generate a lot of safepoints. This works with " \ 632 "GuaranteedSafepointInterval") \ 633 \ 634 product_pd(bool, BackgroundCompilation, \ 635 "A thread requesting compilation is not blocked during " \ 636 "compilation") \ 637 \ 638 product(bool, PrintVMQWaitTime, false, \ 639 "Print out the waiting time in VM operation queue") \ 640 \ 641 develop(bool, NoYieldsInMicrolock, false, \ 642 "Disable yields in microlock") \ 643 \ 644 develop(bool, TraceOopMapGeneration, false, \ 645 "Show OopMapGeneration") \ 646 \ 647 product(bool, MethodFlushing, true, \ 648 "Reclamation of zombie and not-entrant methods") \ 649 \ 650 develop(bool, VerifyStack, false, \ 651 "Verify stack of each thread when it is entering a runtime call") \ 652 \ 653 diagnostic(bool, ForceUnreachable, false, \ 654 "Make all non code cache addresses to be unreachable by " \ 655 "forcing use of 64bit literal fixups") \ 656 \ 657 notproduct(bool, StressDerivedPointers, false, \ 658 "Force scavenge when a derived pointer is detected on stack " \ 659 "after rtm call") \ 660 \ 661 develop(bool, TraceDerivedPointers, false, \ 662 "Trace traversal of derived pointers on stack") \ 663 \ 664 notproduct(bool, TraceCodeBlobStacks, false, \ 665 "Trace stack-walk of codeblobs") \ 666 \ 667 product(bool, PrintJNIResolving, false, \ 668 "Used to implement -v:jni") \ 669 \ 670 notproduct(bool, PrintRewrites, false, \ 671 "Print methods that are being rewritten") \ 672 \ 673 product(bool, UseInlineCaches, true, \ 674 "Use Inline Caches for virtual calls ") \ 675 \ 676 develop(bool, InlineArrayCopy, true, \ 677 "Inline arraycopy native that is known to be part of " \ 678 "base library DLL") \ 679 \ 680 develop(bool, InlineObjectHash, true, \ 681 "Inline Object::hashCode() native that is known to be part " \ 682 "of base library DLL") \ 683 \ 684 develop(bool, InlineNatives, true, \ 685 "Inline natives that are known to be part of base library DLL") \ 686 \ 687 develop(bool, InlineMathNatives, true, \ 688 "Inline SinD, CosD, etc.") \ 689 \ 690 develop(bool, InlineClassNatives, true, \ 691 "Inline Class.isInstance, etc") \ 692 \ 693 develop(bool, InlineThreadNatives, true, \ 694 "Inline Thread.currentThread, etc") \ 695 \ 696 develop(bool, InlineUnsafeOps, true, \ 697 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 698 \ 699 product(bool, CriticalJNINatives, true, \ 700 "Check for critical JNI entry points") \ 701 \ 702 notproduct(bool, StressCriticalJNINatives, false, \ 703 "Exercise register saving code in critical natives") \ 704 \ 705 product(bool, UseSSE42Intrinsics, false, \ 706 "SSE4.2 versions of intrinsics") \ 707 \ 708 product(bool, UseAESIntrinsics, false, \ 709 "Use intrinsics for AES versions of crypto") \ 710 \ 711 product(bool, UseSHA1Intrinsics, false, \ 712 "Use intrinsics for SHA-1 crypto hash function") \ 713 \ 714 product(bool, UseSHA256Intrinsics, false, \ 715 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 716 \ 717 product(bool, UseSHA512Intrinsics, false, \ 718 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 719 \ 720 product(bool, UseCRC32Intrinsics, false, \ 721 "use intrinsics for java.util.zip.CRC32") \ 722 \ 723 develop(bool, TraceCallFixup, false, \ 724 "Trace all call fixups") \ 725 \ 726 develop(bool, DeoptimizeALot, false, \ 727 "Deoptimize at every exit from the runtime system") \ 728 \ 729 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 730 "A comma separated list of bcis to deoptimize at") \ 731 \ 732 product(bool, DeoptimizeRandom, false, \ 733 "Deoptimize random frames on random exit from the runtime system")\ 734 \ 735 notproduct(bool, ZombieALot, false, \ 736 "Create zombies (non-entrant) at exit from the runtime system") \ 737 \ 738 product(bool, UnlinkSymbolsALot, false, \ 739 "Unlink unreferenced symbols from the symbol table at safepoints")\ 740 \ 741 notproduct(bool, WalkStackALot, false, \ 742 "Trace stack (no print) at every exit from the runtime system") \ 743 \ 744 product(bool, Debugging, false, \ 745 "Set when executing debug methods in debug.cpp " \ 746 "(to prevent triggering assertions)") \ 747 \ 748 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 749 "Enable strict checks that safepoints cannot happen for threads " \ 750 "that use No_Safepoint_Verifier") \ 751 \ 752 notproduct(bool, VerifyLastFrame, false, \ 753 "Verify oops on last frame on entry to VM") \ 754 \ 755 develop(bool, TraceHandleAllocation, false, \ 756 "Print out warnings when suspiciously many handles are allocated")\ 757 \ 758 product(bool, UseCompilerSafepoints, true, \ 759 "Stop at safepoints in compiled code") \ 760 \ 761 product(bool, FailOverToOldVerifier, true, \ 762 "Fail over to old verifier when split verifier fails") \ 763 \ 764 develop(bool, ShowSafepointMsgs, false, \ 765 "Show message about safepoint synchronization") \ 766 \ 767 product(bool, SafepointTimeout, false, \ 768 "Time out and warn or fail after SafepointTimeoutDelay " \ 769 "milliseconds if failed to reach safepoint") \ 770 \ 771 develop(bool, DieOnSafepointTimeout, false, \ 772 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 773 \ 774 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 775 /* typically, at most a few retries are needed */ \ 776 product(intx, SuspendRetryCount, 50, \ 777 "Maximum retry count for an external suspend request") \ 778 \ 779 product(intx, SuspendRetryDelay, 5, \ 780 "Milliseconds to delay per retry (* current_retry_count)") \ 781 \ 782 product(bool, AssertOnSuspendWaitFailure, false, \ 783 "Assert/Guarantee on external suspend wait failure") \ 784 \ 785 product(bool, TraceSuspendWaitFailures, false, \ 786 "Trace external suspend wait failures") \ 787 \ 788 product(bool, MaxFDLimit, true, \ 789 "Bump the number of file descriptors to maximum in Solaris") \ 790 \ 791 diagnostic(bool, LogEvents, true, \ 792 "Enable the various ring buffer event logs") \ 793 \ 794 diagnostic(uintx, LogEventsBufferEntries, 10, \ 795 "Number of ring buffer event logs") \ 796 \ 797 product(bool, BytecodeVerificationRemote, true, \ 798 "Enable the Java bytecode verifier for remote classes") \ 799 \ 800 product(bool, BytecodeVerificationLocal, false, \ 801 "Enable the Java bytecode verifier for local classes") \ 802 \ 803 develop(bool, ForceFloatExceptions, trueInDebug, \ 804 "Force exceptions on FP stack under/overflow") \ 805 \ 806 develop(bool, VerifyStackAtCalls, false, \ 807 "Verify that the stack pointer is unchanged after calls") \ 808 \ 809 develop(bool, TraceJavaAssertions, false, \ 810 "Trace java language assertions") \ 811 \ 812 notproduct(bool, CheckAssertionStatusDirectives, false, \ 813 "Temporary - see javaClasses.cpp") \ 814 \ 815 notproduct(bool, PrintMallocFree, false, \ 816 "Trace calls to C heap malloc/free allocation") \ 817 \ 818 product(bool, PrintOopAddress, false, \ 819 "Always print the location of the oop") \ 820 \ 821 notproduct(bool, VerifyCodeCacheOften, false, \ 822 "Verify compiled-code cache often") \ 823 \ 824 develop(bool, ZapDeadCompiledLocals, false, \ 825 "Zap dead locals in compiler frames") \ 826 \ 827 notproduct(bool, ZapDeadLocalsOld, false, \ 828 "Zap dead locals (old version, zaps all frames when " \ 829 "entering the VM") \ 830 \ 831 notproduct(bool, CheckOopishValues, false, \ 832 "Warn if value contains oop (requires ZapDeadLocals)") \ 833 \ 834 develop(bool, UseMallocOnly, false, \ 835 "Use only malloc/free for allocation (no resource area/arena)") \ 836 \ 837 develop(bool, PrintMalloc, false, \ 838 "Print all malloc/free calls") \ 839 \ 840 develop(bool, PrintMallocStatistics, false, \ 841 "Print malloc/free statistics") \ 842 \ 843 develop(bool, ZapResourceArea, trueInDebug, \ 844 "Zap freed resource/arena space with 0xABABABAB") \ 845 \ 846 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 847 "Zap freed VM handle space with 0xBCBCBCBC") \ 848 \ 849 develop(bool, ZapJNIHandleArea, trueInDebug, \ 850 "Zap freed JNI handle space with 0xFEFEFEFE") \ 851 \ 852 notproduct(bool, ZapStackSegments, trueInDebug, \ 853 "Zap allocated/freed stack segments with 0xFADFADED") \ 854 \ 855 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 856 "Zap unused heap space with 0xBAADBABE") \ 857 \ 858 develop(bool, TraceZapUnusedHeapArea, false, \ 859 "Trace zapping of unused heap space") \ 860 \ 861 develop(bool, CheckZapUnusedHeapArea, false, \ 862 "Check zapping of unused heap space") \ 863 \ 864 develop(bool, ZapFillerObjects, trueInDebug, \ 865 "Zap filler objects with 0xDEAFBABE") \ 866 \ 867 develop(bool, PrintVMMessages, true, \ 868 "Print VM messages on console") \ 869 \ 870 product(bool, PrintGCApplicationConcurrentTime, false, \ 871 "Print the time the application has been running") \ 872 \ 873 product(bool, PrintGCApplicationStoppedTime, false, \ 874 "Print the time the application has been stopped") \ 875 \ 876 diagnostic(bool, VerboseVerification, false, \ 877 "Display detailed verification details") \ 878 \ 879 notproduct(uintx, ErrorHandlerTest, 0, \ 880 "If > 0, provokes an error after VM initialization; the value " \ 881 "determines which error to provoke. See test_error_handler() " \ 882 "in debug.cpp.") \ 883 \ 884 develop(bool, Verbose, false, \ 885 "Print additional debugging information from other modes") \ 886 \ 887 develop(bool, PrintMiscellaneous, false, \ 888 "Print uncategorized debugging information (requires +Verbose)") \ 889 \ 890 develop(bool, WizardMode, false, \ 891 "Print much more debugging information") \ 892 \ 893 product(bool, ShowMessageBoxOnError, false, \ 894 "Keep process alive on VM fatal error") \ 895 \ 896 product(bool, CreateMinidumpOnCrash, false, \ 897 "Create minidump on VM fatal error") \ 898 \ 899 product_pd(bool, UseOSErrorReporting, \ 900 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 901 \ 902 product(bool, SuppressFatalErrorMessage, false, \ 903 "Report NO fatal error message (avoid deadlock)") \ 904 \ 905 product(ccstrlist, OnError, "", \ 906 "Run user-defined commands on fatal error; see VMError.cpp " \ 907 "for examples") \ 908 \ 909 product(ccstrlist, OnOutOfMemoryError, "", \ 910 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 911 \ 912 manageable(bool, HeapDumpBeforeFullGC, false, \ 913 "Dump heap to file before any major stop-the-world GC") \ 914 \ 915 manageable(bool, HeapDumpAfterFullGC, false, \ 916 "Dump heap to file after any major stop-the-world GC") \ 917 \ 918 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 919 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 920 \ 921 manageable(ccstr, HeapDumpPath, NULL, \ 922 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 923 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 924 "in the working directory)") \ 925 \ 926 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 927 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 928 "when the heap usage is larger than this") \ 929 \ 930 develop(uintx, HeapDumpSegmentSize, 1*G, \ 931 "Approximate segment size when generating a segmented heap dump") \ 932 \ 933 develop(bool, BreakAtWarning, false, \ 934 "Execute breakpoint upon encountering VM warning") \ 935 \ 936 develop(bool, TraceVMOperation, false, \ 937 "Trace VM operations") \ 938 \ 939 develop(bool, UseFakeTimers, false, \ 940 "Tell whether the VM should use system time or a fake timer") \ 941 \ 942 product(ccstr, NativeMemoryTracking, "off", \ 943 "Native memory tracking options") \ 944 \ 945 diagnostic(bool, PrintNMTStatistics, false, \ 946 "Print native memory tracking summary data if it is on") \ 947 \ 948 diagnostic(bool, LogCompilation, false, \ 949 "Log compilation activity in detail to LogFile") \ 950 \ 951 product(bool, PrintCompilation, false, \ 952 "Print compilations") \ 953 \ 954 diagnostic(bool, TraceNMethodInstalls, false, \ 955 "Trace nmethod installation") \ 956 \ 957 diagnostic(intx, ScavengeRootsInCode, 2, \ 958 "0: do not allow scavengable oops in the code cache; " \ 959 "1: allow scavenging from the code cache; " \ 960 "2: emit as many constants as the compiler can see") \ 961 \ 962 product(bool, AlwaysRestoreFPU, false, \ 963 "Restore the FPU control word after every JNI call (expensive)") \ 964 \ 965 diagnostic(bool, PrintCompilation2, false, \ 966 "Print additional statistics per compilation") \ 967 \ 968 diagnostic(bool, PrintAdapterHandlers, false, \ 969 "Print code generated for i2c/c2i adapters") \ 970 \ 971 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 972 "Verify that i2c/c2i adapters are called properly") \ 973 \ 974 develop(bool, VerifyAdapterSharing, false, \ 975 "Verify that the code for shared adapters is the equivalent") \ 976 \ 977 diagnostic(bool, PrintAssembly, false, \ 978 "Print assembly code (using external disassembler.so)") \ 979 \ 980 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 981 "Print options string passed to disassembler.so") \ 982 \ 983 diagnostic(bool, PrintNMethods, false, \ 984 "Print assembly code for nmethods when generated") \ 985 \ 986 diagnostic(bool, PrintNativeNMethods, false, \ 987 "Print assembly code for native nmethods when generated") \ 988 \ 989 develop(bool, PrintDebugInfo, false, \ 990 "Print debug information for all nmethods when generated") \ 991 \ 992 develop(bool, PrintRelocations, false, \ 993 "Print relocation information for all nmethods when generated") \ 994 \ 995 develop(bool, PrintDependencies, false, \ 996 "Print dependency information for all nmethods when generated") \ 997 \ 998 develop(bool, PrintExceptionHandlers, false, \ 999 "Print exception handler tables for all nmethods when generated") \ 1000 \ 1001 develop(bool, StressCompiledExceptionHandlers, false, \ 1002 "Exercise compiled exception handlers") \ 1003 \ 1004 develop(bool, InterceptOSException, false, \ 1005 "Start debugger when an implicit OS (e.g. NULL) " \ 1006 "exception happens") \ 1007 \ 1008 product(bool, PrintCodeCache, false, \ 1009 "Print the code cache memory usage when exiting") \ 1010 \ 1011 develop(bool, PrintCodeCache2, false, \ 1012 "Print detailed usage information on the code cache when exiting")\ 1013 \ 1014 product(bool, PrintCodeCacheOnCompilation, false, \ 1015 "Print the code cache memory usage each time a method is " \ 1016 "compiled") \ 1017 \ 1018 diagnostic(bool, PrintStubCode, false, \ 1019 "Print generated stub code") \ 1020 \ 1021 product(bool, StackTraceInThrowable, true, \ 1022 "Collect backtrace in throwable when exception happens") \ 1023 \ 1024 product(bool, OmitStackTraceInFastThrow, true, \ 1025 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1026 \ 1027 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1028 "Print bytecode statistics when dumping profiler output") \ 1029 \ 1030 product(bool, ProfilerRecordPC, false, \ 1031 "Collect ticks for each 16 byte interval of compiled code") \ 1032 \ 1033 product(bool, ProfileVM, false, \ 1034 "Profile ticks that fall within VM (either in the VM Thread " \ 1035 "or VM code called through stubs)") \ 1036 \ 1037 product(bool, ProfileIntervals, false, \ 1038 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1039 \ 1040 notproduct(bool, ProfilerCheckIntervals, false, \ 1041 "Collect and print information on spacing of profiler ticks") \ 1042 \ 1043 develop(bool, PrintJVMWarnings, false, \ 1044 "Print warnings for unimplemented JVM functions") \ 1045 \ 1046 product(bool, PrintWarnings, true, \ 1047 "Print JVM warnings to output stream") \ 1048 \ 1049 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1050 "Print warnings for stalled SpinLocks") \ 1051 \ 1052 product(bool, RegisterFinalizersAtInit, true, \ 1053 "Register finalizable objects at end of Object.<init> or " \ 1054 "after allocation") \ 1055 \ 1056 develop(bool, RegisterReferences, true, \ 1057 "Tell whether the VM should register soft/weak/final/phantom " \ 1058 "references") \ 1059 \ 1060 develop(bool, IgnoreRewrites, false, \ 1061 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1062 "This is unsafe!") \ 1063 \ 1064 develop(bool, PrintCodeCacheExtension, false, \ 1065 "Print extension of code cache") \ 1066 \ 1067 develop(bool, UsePrivilegedStack, true, \ 1068 "Enable the security JVM functions") \ 1069 \ 1070 develop(bool, ProtectionDomainVerification, true, \ 1071 "Verify protection domain before resolution in system dictionary")\ 1072 \ 1073 product(bool, ClassUnloading, true, \ 1074 "Do unloading of classes") \ 1075 \ 1076 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1077 "Do unloading of classes with a concurrent marking cycle") \ 1078 \ 1079 develop(bool, DisableStartThread, false, \ 1080 "Disable starting of additional Java threads " \ 1081 "(for debugging only)") \ 1082 \ 1083 develop(bool, MemProfiling, false, \ 1084 "Write memory usage profiling to log file") \ 1085 \ 1086 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1087 "Print the system dictionary at exit") \ 1088 \ 1089 experimental(intx, PredictedLoadedClassCount, 0, \ 1090 "Experimental: Tune loaded class cache starting size") \ 1091 \ 1092 diagnostic(bool, UnsyncloadClass, false, \ 1093 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1094 "class loader must call VM synchronized for findClass " \ 1095 "and defineClass.") \ 1096 \ 1097 product(bool, AlwaysLockClassLoader, false, \ 1098 "Require the VM to acquire the class loader lock before calling " \ 1099 "loadClass() even for class loaders registering " \ 1100 "as parallel capable") \ 1101 \ 1102 product(bool, AllowParallelDefineClass, false, \ 1103 "Allow parallel defineClass requests for class loaders " \ 1104 "registering as parallel capable") \ 1105 \ 1106 product(bool, MustCallLoadClassInternal, false, \ 1107 "Call loadClassInternal() rather than loadClass()") \ 1108 \ 1109 product_pd(bool, DontYieldALot, \ 1110 "Throw away obvious excess yield calls (for Solaris only)") \ 1111 \ 1112 product_pd(bool, ConvertSleepToYield, \ 1113 "Convert sleep(0) to thread yield " \ 1114 "(may be off for Solaris to improve GUI)") \ 1115 \ 1116 product(bool, ConvertYieldToSleep, false, \ 1117 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1118 "behavior (Solaris only)") \ 1119 \ 1120 product(bool, UseBoundThreads, true, \ 1121 "Bind user level threads to kernel threads (for Solaris only)") \ 1122 \ 1123 develop(bool, UseDetachedThreads, true, \ 1124 "Use detached threads that are recycled upon termination " \ 1125 "(for Solaris only)") \ 1126 \ 1127 product(bool, UseLWPSynchronization, true, \ 1128 "Use LWP-based instead of libthread-based synchronization " \ 1129 "(SPARC only)") \ 1130 \ 1131 product(ccstr, SyncKnobs, NULL, \ 1132 "(Unstable) Various monitor synchronization tunables") \ 1133 \ 1134 product(intx, EmitSync, 0, \ 1135 "(Unsafe, Unstable) " \ 1136 "Control emission of inline sync fast-path code") \ 1137 \ 1138 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1139 \ 1140 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1141 \ 1142 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \ 1143 \ 1144 product(intx, SyncVerbose, 0, "(Unstable)") \ 1145 \ 1146 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1147 \ 1148 product(intx, hashCode, 5, \ 1149 "(Unstable) select hashCode generation algorithm") \ 1150 \ 1151 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1152 "(Unstable, Linux-specific) " \ 1153 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1154 \ 1155 product(bool, FilterSpuriousWakeups, true, \ 1156 "Prevent spurious or premature wakeups from object.wait " \ 1157 "(Solaris only)") \ 1158 \ 1159 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1160 \ 1161 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1162 \ 1163 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1164 \ 1165 develop(bool, UsePthreads, false, \ 1166 "Use pthread-based instead of libthread-based synchronization " \ 1167 "(SPARC only)") \ 1168 \ 1169 product(bool, AdjustConcurrency, false, \ 1170 "Call thr_setconcurrency at thread creation time to avoid " \ 1171 "LWP starvation on MP systems (for Solaris Only)") \ 1172 \ 1173 product(bool, ReduceSignalUsage, false, \ 1174 "Reduce the use of OS signals in Java and/or the VM") \ 1175 \ 1176 develop_pd(bool, ShareVtableStubs, \ 1177 "Share vtable stubs (smaller code but worse branch prediction") \ 1178 \ 1179 develop(bool, LoadLineNumberTables, true, \ 1180 "Tell whether the class file parser loads line number tables") \ 1181 \ 1182 develop(bool, LoadLocalVariableTables, true, \ 1183 "Tell whether the class file parser loads local variable tables") \ 1184 \ 1185 develop(bool, LoadLocalVariableTypeTables, true, \ 1186 "Tell whether the class file parser loads local variable type" \ 1187 "tables") \ 1188 \ 1189 product(bool, AllowUserSignalHandlers, false, \ 1190 "Do not complain if the application installs signal handlers " \ 1191 "(Solaris & Linux only)") \ 1192 \ 1193 product(bool, UseSignalChaining, true, \ 1194 "Use signal-chaining to invoke signal handlers installed " \ 1195 "by the application (Solaris & Linux only)") \ 1196 \ 1197 product(bool, UseAltSigs, false, \ 1198 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1199 "internal signals (Solaris only)") \ 1200 \ 1201 product(bool, AllowJNIEnvProxy, false, \ 1202 "Allow JNIEnv proxies for jdbx") \ 1203 \ 1204 product(bool, JNIDetachReleasesMonitors, true, \ 1205 "JNI DetachCurrentThread releases monitors owned by thread") \ 1206 \ 1207 product(bool, RestoreMXCSROnJNICalls, false, \ 1208 "Restore MXCSR when returning from JNI calls") \ 1209 \ 1210 product(bool, CheckJNICalls, false, \ 1211 "Verify all arguments to JNI calls") \ 1212 \ 1213 product(bool, CheckEndorsedAndExtDirs, false, \ 1214 "Verify the endorsed and extension directories are not used") \ 1215 \ 1216 product(bool, UseFastJNIAccessors, true, \ 1217 "Use optimized versions of Get<Primitive>Field") \ 1218 \ 1219 product(intx, MaxJNILocalCapacity, 65536, \ 1220 "Maximum allowable local JNI handle capacity to " \ 1221 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1222 "where <= 0 is unlimited, default: 65536") \ 1223 \ 1224 product(bool, EagerXrunInit, false, \ 1225 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1226 "but not all -Xrun libraries may support the state of the VM " \ 1227 "at this time") \ 1228 \ 1229 product(bool, PreserveAllAnnotations, false, \ 1230 "Preserve RuntimeInvisibleAnnotations as well " \ 1231 "as RuntimeVisibleAnnotations") \ 1232 \ 1233 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1234 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1235 \ 1236 product(bool, LazyBootClassLoader, true, \ 1237 "Enable/disable lazy opening of boot class path entries") \ 1238 \ 1239 product(bool, UseXMMForArrayCopy, false, \ 1240 "Use SSE2 MOVQ instruction for Arraycopy") \ 1241 \ 1242 product(intx, FieldsAllocationStyle, 1, \ 1243 "0 - type based with oops first, 1 - with oops last, " \ 1244 "2 - oops in super and sub classes are together") \ 1245 \ 1246 product(bool, CompactFields, true, \ 1247 "Allocate nonstatic fields in gaps between previous fields") \ 1248 \ 1249 notproduct(bool, PrintFieldLayout, false, \ 1250 "Print field layout for each class") \ 1251 \ 1252 product(intx, ContendedPaddingWidth, 128, \ 1253 "How many bytes to pad the fields/classes marked @Contended with")\ 1254 \ 1255 product(bool, EnableContended, true, \ 1256 "Enable @Contended annotation support") \ 1257 \ 1258 product(bool, RestrictContended, true, \ 1259 "Restrict @Contended to trusted classes") \ 1260 \ 1261 product(bool, UseBiasedLocking, true, \ 1262 "Enable biased locking in JVM") \ 1263 \ 1264 product(intx, BiasedLockingStartupDelay, 4000, \ 1265 "Number of milliseconds to wait before enabling biased locking") \ 1266 \ 1267 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1268 "Print statistics of biased locking in JVM") \ 1269 \ 1270 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1271 "Threshold of number of revocations per type to try to " \ 1272 "rebias all objects in the heap of that type") \ 1273 \ 1274 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1275 "Threshold of number of revocations per type to permanently " \ 1276 "revoke biases of all objects in the heap of that type") \ 1277 \ 1278 product(intx, BiasedLockingDecayTime, 25000, \ 1279 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1280 "type after previous bulk rebias") \ 1281 \ 1282 product(bool, ExitOnOutOfMemoryError, false, \ 1283 "JVM exits on the first occurrence of an out-of-memory error") \ 1284 \ 1285 product(bool, CrashOnOutOfMemoryError, false, \ 1286 "JVM aborts, producing an error log and core/mini dump, on the " \ 1287 "first occurrence of an out-of-memory error") \ 1288 \ 1289 /* tracing */ \ 1290 \ 1291 notproduct(bool, TraceRuntimeCalls, false, \ 1292 "Trace run-time calls") \ 1293 \ 1294 develop(bool, TraceJNICalls, false, \ 1295 "Trace JNI calls") \ 1296 \ 1297 develop(bool, StressRewriter, false, \ 1298 "Stress linktime bytecode rewriting") \ 1299 \ 1300 notproduct(bool, TraceJVMCalls, false, \ 1301 "Trace JVM calls") \ 1302 \ 1303 product(ccstr, TraceJVMTI, NULL, \ 1304 "Trace flags for JVMTI functions and events") \ 1305 \ 1306 /* This option can change an EMCP method into an obsolete method. */ \ 1307 /* This can affect tests that except specific methods to be EMCP. */ \ 1308 /* This option should be used with caution. */ \ 1309 product(bool, StressLdcRewrite, false, \ 1310 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1311 \ 1312 product(intx, TraceRedefineClasses, 0, \ 1313 "Trace level for JVMTI RedefineClasses") \ 1314 \ 1315 develop(bool, StressMethodComparator, false, \ 1316 "Run the MethodComparator on all loaded methods") \ 1317 \ 1318 /* change to false by default sometime after Mustang */ \ 1319 product(bool, VerifyMergedCPBytecodes, true, \ 1320 "Verify bytecodes after RedefineClasses constant pool merging") \ 1321 \ 1322 develop(bool, TraceJNIHandleAllocation, false, \ 1323 "Trace allocation/deallocation of JNI handle blocks") \ 1324 \ 1325 develop(bool, TraceThreadEvents, false, \ 1326 "Trace all thread events") \ 1327 \ 1328 develop(bool, TraceBytecodes, false, \ 1329 "Trace bytecode execution") \ 1330 \ 1331 develop(bool, TraceClassInitialization, false, \ 1332 "Trace class initialization") \ 1333 \ 1334 develop(bool, TraceExceptions, false, \ 1335 "Trace exceptions") \ 1336 \ 1337 develop(bool, TraceICs, false, \ 1338 "Trace inline cache changes") \ 1339 \ 1340 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1341 "Trace method invocation counter overflow") \ 1342 \ 1343 develop(bool, TraceInlineCacheClearing, false, \ 1344 "Trace clearing of inline caches in nmethods") \ 1345 \ 1346 develop(bool, TraceDependencies, false, \ 1347 "Trace dependencies") \ 1348 \ 1349 develop(bool, VerifyDependencies, trueInDebug, \ 1350 "Exercise and verify the compilation dependency mechanism") \ 1351 \ 1352 develop(bool, TraceNewOopMapGeneration, false, \ 1353 "Trace OopMapGeneration") \ 1354 \ 1355 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1356 "Trace OopMapGeneration: print detailed cell states") \ 1357 \ 1358 develop(bool, TimeOopMap, false, \ 1359 "Time calls to GenerateOopMap::compute_map() in sum") \ 1360 \ 1361 develop(bool, TimeOopMap2, false, \ 1362 "Time calls to GenerateOopMap::compute_map() individually") \ 1363 \ 1364 develop(bool, TraceMonitorMismatch, false, \ 1365 "Trace monitor matching failures during OopMapGeneration") \ 1366 \ 1367 develop(bool, TraceOopMapRewrites, false, \ 1368 "Trace rewriting of method oops during oop map generation") \ 1369 \ 1370 develop(bool, TraceSafepoint, false, \ 1371 "Trace safepoint operations") \ 1372 \ 1373 develop(bool, TraceICBuffer, false, \ 1374 "Trace usage of IC buffer") \ 1375 \ 1376 develop(bool, TraceCompiledIC, false, \ 1377 "Trace changes of compiled IC") \ 1378 \ 1379 notproduct(bool, TraceZapDeadLocals, false, \ 1380 "Trace zapping dead locals") \ 1381 \ 1382 develop(bool, TraceStartupTime, false, \ 1383 "Trace setup time") \ 1384 \ 1385 develop(bool, TraceProtectionDomainVerification, false, \ 1386 "Trace protection domain verification") \ 1387 \ 1388 develop(bool, TraceClearedExceptions, false, \ 1389 "Print when an exception is forcibly cleared") \ 1390 \ 1391 product(bool, TraceClassResolution, false, \ 1392 "Trace all constant pool resolutions (for debugging)") \ 1393 \ 1394 product(bool, TraceBiasedLocking, false, \ 1395 "Trace biased locking in JVM") \ 1396 \ 1397 product(bool, TraceMonitorInflation, false, \ 1398 "Trace monitor inflation in JVM") \ 1399 \ 1400 /* gc */ \ 1401 \ 1402 product(bool, UseSerialGC, false, \ 1403 "Use the Serial garbage collector") \ 1404 \ 1405 product(bool, UseG1GC, false, \ 1406 "Use the Garbage-First garbage collector") \ 1407 \ 1408 product(bool, UseParallelGC, false, \ 1409 "Use the Parallel Scavenge garbage collector") \ 1410 \ 1411 product(bool, UseParallelOldGC, false, \ 1412 "Use the Parallel Old garbage collector") \ 1413 \ 1414 product(uintx, HeapMaximumCompactionInterval, 20, \ 1415 "How often should we maximally compact the heap (not allowing " \ 1416 "any dead space)") \ 1417 \ 1418 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1419 "The collection count for the first maximum compaction") \ 1420 \ 1421 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1422 "Use maximum compaction in the Parallel Old garbage collector " \ 1423 "for a system GC") \ 1424 \ 1425 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1426 "The mean used by the parallel compact dead wood " \ 1427 "limiter (a number between 0-100)") \ 1428 \ 1429 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1430 "The standard deviation used by the parallel compact dead wood " \ 1431 "limiter (a number between 0-100)") \ 1432 \ 1433 product(uintx, ParallelGCThreads, 0, \ 1434 "Number of parallel threads parallel gc will use") \ 1435 \ 1436 product(bool, UseDynamicNumberOfGCThreads, false, \ 1437 "Dynamically choose the number of parallel threads " \ 1438 "parallel gc will use") \ 1439 \ 1440 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1441 "Force dynamic selection of the number of " \ 1442 "parallel threads parallel gc will use to aid debugging") \ 1443 \ 1444 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1445 "Size of heap (bytes) per GC thread used in calculating the " \ 1446 "number of GC threads") \ 1447 \ 1448 product(bool, TraceDynamicGCThreads, false, \ 1449 "Trace the dynamic GC thread usage") \ 1450 \ 1451 develop(bool, ParallelOldGCSplitALot, false, \ 1452 "Provoke splitting (copying data from a young gen space to " \ 1453 "multiple destination spaces)") \ 1454 \ 1455 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1456 "How often to provoke splitting a young gen space") \ 1457 \ 1458 product(uintx, ConcGCThreads, 0, \ 1459 "Number of threads concurrent gc will use") \ 1460 \ 1461 product(uintx, YoungPLABSize, 4096, \ 1462 "Size of young gen promotion LAB's (in HeapWords)") \ 1463 \ 1464 product(uintx, OldPLABSize, 1024, \ 1465 "Size of old gen promotion LAB's (in HeapWords)") \ 1466 \ 1467 product(uintx, GCTaskTimeStampEntries, 200, \ 1468 "Number of time stamp entries per gc worker thread") \ 1469 \ 1470 product(bool, AlwaysTenure, false, \ 1471 "Always tenure objects in eden (ParallelGC only)") \ 1472 \ 1473 product(bool, NeverTenure, false, \ 1474 "Never tenure objects in eden, may tenure on overflow " \ 1475 "(ParallelGC only)") \ 1476 \ 1477 product(bool, ScavengeBeforeFullGC, true, \ 1478 "Scavenge youngest generation before each full GC, " \ 1479 "used with UseParallelGC") \ 1480 \ 1481 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1482 "Allow scavenges to occur when to-space contains objects") \ 1483 \ 1484 product(bool, UseConcMarkSweepGC, false, \ 1485 "Use Concurrent Mark-Sweep GC in the old generation") \ 1486 \ 1487 product(bool, ExplicitGCInvokesConcurrent, false, \ 1488 "A System.gc() request invokes a concurrent collection; " \ 1489 "(effective only when UseConcMarkSweepGC)") \ 1490 \ 1491 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1492 "A System.gc() request invokes a concurrent collection and " \ 1493 "also unloads classes during such a concurrent gc cycle " \ 1494 "(effective only when UseConcMarkSweepGC)") \ 1495 \ 1496 product(bool, GCLockerInvokesConcurrent, false, \ 1497 "The exit of a JNI critical section necessitating a scavenge, " \ 1498 "also kicks off a background concurrent collection") \ 1499 \ 1500 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1501 "How much the GC can expand the eden by while the GC locker " \ 1502 "is active (as a percentage)") \ 1503 \ 1504 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1505 "Number of times to retry allocations when " \ 1506 "blocked by the GC locker") \ 1507 \ 1508 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1509 "Use adaptive free lists in the CMS generation") \ 1510 \ 1511 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1512 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1513 \ 1514 develop(bool, RotateCMSCollectionTypes, false, \ 1515 "Rotate the CMS collections among concurrent and STW") \ 1516 \ 1517 product(bool, UseCMSBestFit, true, \ 1518 "Use CMS best fit allocation strategy") \ 1519 \ 1520 product(bool, UseCMSCollectionPassing, true, \ 1521 "Use passing of collection from background to foreground") \ 1522 \ 1523 product(bool, UseParNewGC, false, \ 1524 "Use parallel threads in the new generation") \ 1525 \ 1526 product(bool, ParallelGCVerbose, false, \ 1527 "Verbose output for parallel gc") \ 1528 \ 1529 product(uintx, ParallelGCBufferWastePct, 10, \ 1530 "Wasted fraction of parallel allocation buffer") \ 1531 \ 1532 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1533 "Retain parallel allocation buffers across scavenges; " \ 1534 "it is disabled because this currently conflicts with " \ 1535 "parallel card scanning under certain conditions.") \ 1536 \ 1537 product(uintx, TargetPLABWastePct, 10, \ 1538 "Target wasted space in last buffer as percent of overall " \ 1539 "allocation") \ 1540 \ 1541 product(uintx, PLABWeight, 75, \ 1542 "Percentage (0-100) used to weigh the current sample when " \ 1543 "computing exponentially decaying average for ResizePLAB") \ 1544 \ 1545 product(bool, ResizePLAB, true, \ 1546 "Dynamically resize (survivor space) promotion LAB's") \ 1547 \ 1548 product(bool, PrintPLAB, false, \ 1549 "Print (survivor space) promotion LAB's sizing decisions") \ 1550 \ 1551 product(intx, ParGCArrayScanChunk, 50, \ 1552 "Scan a subset of object array and push remainder, if array is " \ 1553 "bigger than this") \ 1554 \ 1555 product(bool, ParGCUseLocalOverflow, false, \ 1556 "Instead of a global overflow list, use local overflow stacks") \ 1557 \ 1558 product(bool, ParGCTrimOverflow, true, \ 1559 "Eagerly trim the local overflow lists " \ 1560 "(when ParGCUseLocalOverflow)") \ 1561 \ 1562 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1563 "Simulate work queue overflow in ParNew") \ 1564 \ 1565 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1566 "An `interval' counter that determines how frequently " \ 1567 "we simulate overflow; a smaller number increases frequency") \ 1568 \ 1569 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1570 "The desired number of objects to claim from the overflow list") \ 1571 \ 1572 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1573 "The number of strides per worker thread that we divide up the " \ 1574 "card table scanning work into") \ 1575 \ 1576 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1577 "The number of cards in each chunk of the parallel chunks used " \ 1578 "during card table scanning") \ 1579 \ 1580 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1581 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1582 "for parallel GC") \ 1583 \ 1584 product(uintx, OldPLABWeight, 50, \ 1585 "Percentage (0-100) used to weight the current sample when " \ 1586 "computing exponentially decaying average for resizing " \ 1587 "CMSParPromoteBlocksToClaim") \ 1588 \ 1589 product(bool, ResizeOldPLAB, true, \ 1590 "Dynamically resize (old gen) promotion LAB's") \ 1591 \ 1592 product(bool, PrintOldPLAB, false, \ 1593 "Print (old gen) promotion LAB's sizing decisions") \ 1594 \ 1595 product(uintx, CMSOldPLABMin, 16, \ 1596 "Minimum size of CMS gen promotion LAB caches per worker " \ 1597 "per block size") \ 1598 \ 1599 product(uintx, CMSOldPLABMax, 1024, \ 1600 "Maximum size of CMS gen promotion LAB caches per worker " \ 1601 "per block size") \ 1602 \ 1603 product(uintx, CMSOldPLABNumRefills, 4, \ 1604 "Nominal number of refills of CMS gen promotion LAB cache " \ 1605 "per worker per block size") \ 1606 \ 1607 product(bool, CMSOldPLABResizeQuicker, false, \ 1608 "React on-the-fly during a scavenge to a sudden " \ 1609 "change in block demand rate") \ 1610 \ 1611 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1612 "The tolerance of the phase-change detector for on-the-fly " \ 1613 "PLAB resizing during a scavenge") \ 1614 \ 1615 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1616 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1617 "during a scavenge") \ 1618 \ 1619 product(bool, AlwaysPreTouch, false, \ 1620 "Force all freshly committed pages to be pre-touched") \ 1621 \ 1622 product_pd(uintx, CMSYoungGenPerWorker, \ 1623 "The maximum size of young gen chosen by default per GC worker " \ 1624 "thread available") \ 1625 \ 1626 product(bool, CMSIncrementalMode, false, \ 1627 "Whether CMS GC should operate in \"incremental\" mode") \ 1628 \ 1629 product(uintx, CMSIncrementalDutyCycle, 10, \ 1630 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1631 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1632 "value.") \ 1633 \ 1634 product(bool, CMSIncrementalPacing, true, \ 1635 "Whether the CMS incremental mode duty cycle should be " \ 1636 "automatically adjusted") \ 1637 \ 1638 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1639 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1640 "used when CMSIncrementalPacing is enabled") \ 1641 \ 1642 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1643 "Percentage (0-100) used to add conservatism when computing the " \ 1644 "duty cycle") \ 1645 \ 1646 product(uintx, CMSIncrementalOffset, 0, \ 1647 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1648 "is shifted to the right within the period between young GCs") \ 1649 \ 1650 product(uintx, CMSExpAvgFactor, 50, \ 1651 "Percentage (0-100) used to weigh the current sample when " \ 1652 "computing exponential averages for CMS statistics") \ 1653 \ 1654 product(uintx, CMS_FLSWeight, 75, \ 1655 "Percentage (0-100) used to weigh the current sample when " \ 1656 "computing exponentially decaying averages for CMS FLS " \ 1657 "statistics") \ 1658 \ 1659 product(uintx, CMS_FLSPadding, 1, \ 1660 "The multiple of deviation from mean to use for buffering " \ 1661 "against volatility in free list demand") \ 1662 \ 1663 product(uintx, FLSCoalescePolicy, 2, \ 1664 "CMS: aggressiveness level for coalescing, increasing " \ 1665 "from 0 to 4") \ 1666 \ 1667 product(bool, FLSAlwaysCoalesceLarge, false, \ 1668 "CMS: larger free blocks are always available for coalescing") \ 1669 \ 1670 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1671 "CMS: the smaller the percentage the greater the coalescing " \ 1672 "force") \ 1673 \ 1674 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1675 "CMS: the factor by which to inflate estimated demand of small " \ 1676 "block sizes to prevent coalescing with an adjoining block") \ 1677 \ 1678 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1679 "CMS: the factor by which to inflate estimated demand of large " \ 1680 "block sizes to prevent coalescing with an adjoining block") \ 1681 \ 1682 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1683 "CMS: the factor by which to inflate estimated demand of small " \ 1684 "block sizes to prevent splitting to supply demand for smaller " \ 1685 "blocks") \ 1686 \ 1687 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1688 "CMS: the factor by which to inflate estimated demand of large " \ 1689 "block sizes to prevent splitting to supply demand for smaller " \ 1690 "blocks") \ 1691 \ 1692 product(bool, CMSExtrapolateSweep, false, \ 1693 "CMS: cushion for block demand during sweep") \ 1694 \ 1695 product(uintx, CMS_SweepWeight, 75, \ 1696 "Percentage (0-100) used to weight the current sample when " \ 1697 "computing exponentially decaying average for inter-sweep " \ 1698 "duration") \ 1699 \ 1700 product(uintx, CMS_SweepPadding, 1, \ 1701 "The multiple of deviation from mean to use for buffering " \ 1702 "against volatility in inter-sweep duration") \ 1703 \ 1704 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1705 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1706 "duration exceeds this threshold in milliseconds") \ 1707 \ 1708 develop(bool, CMSTraceIncrementalMode, false, \ 1709 "Trace CMS incremental mode") \ 1710 \ 1711 develop(bool, CMSTraceIncrementalPacing, false, \ 1712 "Trace CMS incremental mode pacing computation") \ 1713 \ 1714 develop(bool, CMSTraceThreadState, false, \ 1715 "Trace the CMS thread state (enable the trace_state() method)") \ 1716 \ 1717 product(bool, CMSClassUnloadingEnabled, true, \ 1718 "Whether class unloading enabled when using CMS GC") \ 1719 \ 1720 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1721 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1722 "count for which classes may not be unloaded") \ 1723 \ 1724 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1725 "Compact when asked to collect CMS gen with " \ 1726 "clear_all_soft_refs()") \ 1727 \ 1728 product(bool, UseCMSCompactAtFullCollection, true, \ 1729 "Use Mark-Sweep-Compact algorithm at full collections") \ 1730 \ 1731 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1732 "Number of CMS full collection done before compaction if > 0") \ 1733 \ 1734 develop(intx, CMSDictionaryChoice, 0, \ 1735 "Use BinaryTreeDictionary as default in the CMS generation") \ 1736 \ 1737 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1738 "Replenish an indexed free list with this number of chunks") \ 1739 \ 1740 product(bool, CMSReplenishIntermediate, true, \ 1741 "Replenish all intermediate free-list caches") \ 1742 \ 1743 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1744 "When satisfying batched demand, split blocks from the " \ 1745 "IndexedFreeList whose size is a multiple of requested size") \ 1746 \ 1747 product(bool, CMSLoopWarn, false, \ 1748 "Warn in case of excessive CMS looping") \ 1749 \ 1750 develop(bool, CMSOverflowEarlyRestoration, false, \ 1751 "Restore preserved marks early") \ 1752 \ 1753 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1754 "Size of marking stack") \ 1755 \ 1756 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1757 "Maximum size of marking stack") \ 1758 \ 1759 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1760 "Simulate frequent marking stack / work queue overflow") \ 1761 \ 1762 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1763 "An \"interval\" counter that determines how frequently " \ 1764 "to simulate overflow; a smaller number increases frequency") \ 1765 \ 1766 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1767 "(Temporary, subject to experimentation) " \ 1768 "Maximum number of abortable preclean iterations, if > 0") \ 1769 \ 1770 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1771 "(Temporary, subject to experimentation) " \ 1772 "Maximum time in abortable preclean (in milliseconds)") \ 1773 \ 1774 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1775 "(Temporary, subject to experimentation) " \ 1776 "Nominal minimum work per abortable preclean iteration") \ 1777 \ 1778 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1779 "(Temporary, subject to experimentation) " \ 1780 "Time that we sleep between iterations when not given " \ 1781 "enough work per iteration") \ 1782 \ 1783 product(uintx, CMSRescanMultiple, 32, \ 1784 "Size (in cards) of CMS parallel rescan task") \ 1785 \ 1786 product(uintx, CMSConcMarkMultiple, 32, \ 1787 "Size (in cards) of CMS concurrent MT marking task") \ 1788 \ 1789 product(bool, CMSAbortSemantics, false, \ 1790 "Whether abort-on-overflow semantics is implemented") \ 1791 \ 1792 product(bool, CMSParallelInitialMarkEnabled, true, \ 1793 "Use the parallel initial mark.") \ 1794 \ 1795 product(bool, CMSParallelRemarkEnabled, true, \ 1796 "Whether parallel remark enabled (only if ParNewGC)") \ 1797 \ 1798 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1799 "Whether parallel remark of survivor space " \ 1800 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1801 \ 1802 product(bool, CMSPLABRecordAlways, true, \ 1803 "Always record survivor space PLAB boundaries (effective only " \ 1804 "if CMSParallelSurvivorRemarkEnabled)") \ 1805 \ 1806 product(bool, CMSEdenChunksRecordAlways, true, \ 1807 "Always record eden chunks used for the parallel initial mark " \ 1808 "or remark of eden") \ 1809 \ 1810 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1811 "Print the eden and the survivor chunks used for the parallel " \ 1812 "initial mark or remark of the eden/survivor spaces") \ 1813 \ 1814 product(bool, CMSConcurrentMTEnabled, true, \ 1815 "Whether multi-threaded concurrent work enabled " \ 1816 "(effective only if ParNewGC)") \ 1817 \ 1818 product(bool, CMSPrecleaningEnabled, true, \ 1819 "Whether concurrent precleaning enabled") \ 1820 \ 1821 product(uintx, CMSPrecleanIter, 3, \ 1822 "Maximum number of precleaning iteration passes") \ 1823 \ 1824 product(uintx, CMSPrecleanNumerator, 2, \ 1825 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1826 "ratio") \ 1827 \ 1828 product(uintx, CMSPrecleanDenominator, 3, \ 1829 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1830 "ratio") \ 1831 \ 1832 product(bool, CMSPrecleanRefLists1, true, \ 1833 "Preclean ref lists during (initial) preclean phase") \ 1834 \ 1835 product(bool, CMSPrecleanRefLists2, false, \ 1836 "Preclean ref lists during abortable preclean phase") \ 1837 \ 1838 product(bool, CMSPrecleanSurvivors1, false, \ 1839 "Preclean survivors during (initial) preclean phase") \ 1840 \ 1841 product(bool, CMSPrecleanSurvivors2, true, \ 1842 "Preclean survivors during abortable preclean phase") \ 1843 \ 1844 product(uintx, CMSPrecleanThreshold, 1000, \ 1845 "Do not iterate again if number of dirty cards is less than this")\ 1846 \ 1847 product(bool, CMSCleanOnEnter, true, \ 1848 "Clean-on-enter optimization for reducing number of dirty cards") \ 1849 \ 1850 product(uintx, CMSRemarkVerifyVariant, 1, \ 1851 "Choose variant (1,2) of verification following remark") \ 1852 \ 1853 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1854 "If Eden size is below this, do not try to schedule remark") \ 1855 \ 1856 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1857 "The Eden occupancy percentage (0-100) at which " \ 1858 "to try and schedule remark pause") \ 1859 \ 1860 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1861 "Start sampling eden top at least before young gen " \ 1862 "occupancy reaches 1/<ratio> of the size at which " \ 1863 "we plan to schedule remark") \ 1864 \ 1865 product(uintx, CMSSamplingGrain, 16*K, \ 1866 "The minimum distance between eden samples for CMS (see above)") \ 1867 \ 1868 product(bool, CMSScavengeBeforeRemark, false, \ 1869 "Attempt scavenge before the CMS remark step") \ 1870 \ 1871 develop(bool, CMSTraceSweeper, false, \ 1872 "Trace some actions of the CMS sweeper") \ 1873 \ 1874 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1875 "Don't drain below this size per parallel worker/thief") \ 1876 \ 1877 manageable(intx, CMSWaitDuration, 2000, \ 1878 "Time in milliseconds that CMS thread waits for young GC") \ 1879 \ 1880 develop(uintx, CMSCheckInterval, 1000, \ 1881 "Interval in milliseconds that CMS thread checks if it " \ 1882 "should start a collection cycle") \ 1883 \ 1884 product(bool, CMSYield, true, \ 1885 "Yield between steps of CMS") \ 1886 \ 1887 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1888 "Bitmap operations should process at most this many bits " \ 1889 "between yields") \ 1890 \ 1891 product(bool, CMSDumpAtPromotionFailure, false, \ 1892 "Dump useful information about the state of the CMS old " \ 1893 "generation upon a promotion failure") \ 1894 \ 1895 product(bool, CMSPrintChunksInDump, false, \ 1896 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1897 "more detailed information about the free chunks") \ 1898 \ 1899 product(bool, CMSPrintObjectsInDump, false, \ 1900 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1901 "more detailed information about the allocated objects") \ 1902 \ 1903 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1904 "Verify that all references across the FLS boundary " \ 1905 "are to valid objects") \ 1906 \ 1907 diagnostic(bool, FLSVerifyLists, false, \ 1908 "Do lots of (expensive) FreeListSpace verification") \ 1909 \ 1910 diagnostic(bool, FLSVerifyIndexTable, false, \ 1911 "Do lots of (expensive) FLS index table verification") \ 1912 \ 1913 develop(bool, FLSVerifyDictionary, false, \ 1914 "Do lots of (expensive) FLS dictionary verification") \ 1915 \ 1916 develop(bool, VerifyBlockOffsetArray, false, \ 1917 "Do (expensive) block offset array verification") \ 1918 \ 1919 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1920 "Maintain _unallocated_block in BlockOffsetArray " \ 1921 "(currently applicable only to CMS collector)") \ 1922 \ 1923 develop(bool, TraceCMSState, false, \ 1924 "Trace the state of the CMS collection") \ 1925 \ 1926 product(intx, RefDiscoveryPolicy, 0, \ 1927 "Select type of reference discovery policy: " \ 1928 "reference-based(0) or referent-based(1)") \ 1929 \ 1930 product(bool, ParallelRefProcEnabled, false, \ 1931 "Enable parallel reference processing whenever possible") \ 1932 \ 1933 product(bool, ParallelRefProcBalancingEnabled, true, \ 1934 "Enable balancing of reference processing queues") \ 1935 \ 1936 product(uintx, CMSTriggerRatio, 80, \ 1937 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1938 "allocated before a CMS collection cycle commences") \ 1939 \ 1940 product(uintx, CMSBootstrapOccupancy, 50, \ 1941 "Percentage CMS generation occupancy at which to " \ 1942 "initiate CMS collection for bootstrapping collection stats") \ 1943 \ 1944 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1945 "Percentage CMS generation occupancy to start a CMS collection " \ 1946 "cycle. A negative value means that CMSTriggerRatio is used") \ 1947 \ 1948 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1949 "Percentage of the (entire) heap occupancy to start a " \ 1950 "concurrent GC cycle. It is used by GCs that trigger a " \ 1951 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1952 "not just one of the generations (e.g., G1). A value of 0 " \ 1953 "denotes 'do constant GC cycles'.") \ 1954 \ 1955 manageable(intx, CMSTriggerInterval, -1, \ 1956 "Commence a CMS collection cycle (at least) every so many " \ 1957 "milliseconds (0 permanently, -1 disabled)") \ 1958 \ 1959 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1960 "Only use occupancy as a criterion for starting a CMS collection")\ 1961 \ 1962 product(uintx, CMSIsTooFullPercentage, 98, \ 1963 "An absolute ceiling above which CMS will always consider the " \ 1964 "unloading of classes when class unloading is enabled") \ 1965 \ 1966 develop(bool, CMSTestInFreeList, false, \ 1967 "Check if the coalesced range is already in the " \ 1968 "free lists as claimed") \ 1969 \ 1970 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1971 "Check that all the garbage collected was returned to the " \ 1972 "free lists") \ 1973 \ 1974 notproduct(bool, ScavengeALot, false, \ 1975 "Force scavenge at every Nth exit from the runtime system " \ 1976 "(N=ScavengeALotInterval)") \ 1977 \ 1978 develop(bool, FullGCALot, false, \ 1979 "Force full gc at every Nth exit from the runtime system " \ 1980 "(N=FullGCALotInterval)") \ 1981 \ 1982 notproduct(bool, GCALotAtAllSafepoints, false, \ 1983 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1984 \ 1985 product(bool, PrintPromotionFailure, false, \ 1986 "Print additional diagnostic information following " \ 1987 "promotion failure") \ 1988 \ 1989 notproduct(bool, PromotionFailureALot, false, \ 1990 "Use promotion failure handling on every youngest generation " \ 1991 "collection") \ 1992 \ 1993 develop(uintx, PromotionFailureALotCount, 1000, \ 1994 "Number of promotion failures occurring at ParGCAllocBuffer " \ 1995 "refill attempts (ParNew) or promotion attempts " \ 1996 "(other young collectors)") \ 1997 \ 1998 develop(uintx, PromotionFailureALotInterval, 5, \ 1999 "Total collections between promotion failures alot") \ 2000 \ 2001 experimental(uintx, WorkStealingSleepMillis, 1, \ 2002 "Sleep time when sleep is used for yields") \ 2003 \ 2004 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2005 "Number of yields before a sleep is done during workstealing") \ 2006 \ 2007 experimental(uintx, WorkStealingHardSpins, 4096, \ 2008 "Number of iterations in a spin loop between checks on " \ 2009 "time out of hard spin") \ 2010 \ 2011 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2012 "Ratio of hard spins to calls to yield") \ 2013 \ 2014 develop(uintx, ObjArrayMarkingStride, 512, \ 2015 "Number of object array elements to push onto the marking stack " \ 2016 "before pushing a continuation entry") \ 2017 \ 2018 develop(bool, MetadataAllocationFailALot, false, \ 2019 "Fail metadata allocations at intervals controlled by " \ 2020 "MetadataAllocationFailALotInterval") \ 2021 \ 2022 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2023 "Metadata allocation failure a lot interval") \ 2024 \ 2025 develop(bool, TraceMetadataChunkAllocation, false, \ 2026 "Trace chunk metadata allocations") \ 2027 \ 2028 product(bool, TraceMetadataHumongousAllocation, false, \ 2029 "Trace humongous metadata allocations") \ 2030 \ 2031 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2032 "Trace virtual space metadata allocations") \ 2033 \ 2034 notproduct(bool, ExecuteInternalVMTests, false, \ 2035 "Enable execution of internal VM tests") \ 2036 \ 2037 notproduct(bool, VerboseInternalVMTests, false, \ 2038 "Turn on logging for internal VM tests.") \ 2039 \ 2040 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2041 \ 2042 product_pd(bool, ResizeTLAB, \ 2043 "Dynamically resize TLAB size for threads") \ 2044 \ 2045 product(bool, ZeroTLAB, false, \ 2046 "Zero out the newly created TLAB") \ 2047 \ 2048 product(bool, FastTLABRefill, true, \ 2049 "Use fast TLAB refill code") \ 2050 \ 2051 product(bool, PrintTLAB, false, \ 2052 "Print various TLAB related information") \ 2053 \ 2054 product(bool, TLABStats, true, \ 2055 "Provide more detailed and expensive TLAB statistics " \ 2056 "(with PrintTLAB)") \ 2057 \ 2058 product_pd(bool, NeverActAsServerClassMachine, \ 2059 "Never act like a server-class machine") \ 2060 \ 2061 product(bool, AlwaysActAsServerClassMachine, false, \ 2062 "Always act like a server-class machine") \ 2063 \ 2064 product_pd(uint64_t, MaxRAM, \ 2065 "Real memory size (in bytes) used to set maximum heap size") \ 2066 \ 2067 product(uintx, ErgoHeapSizeLimit, 0, \ 2068 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2069 "MaxRAM / MaxRAMFraction") \ 2070 \ 2071 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2072 "Use CGroup memory limit as physical memory limit for heap " \ 2073 "sizing") \ 2074 \ 2075 product(uintx, MaxRAMFraction, 4, \ 2076 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2077 "size") \ 2078 \ 2079 product(uintx, DefaultMaxRAMFraction, 4, \ 2080 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2081 "size; deprecated: to be renamed to MaxRAMFraction") \ 2082 \ 2083 product(uintx, MinRAMFraction, 2, \ 2084 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2085 "size on systems with small physical memory size") \ 2086 \ 2087 product(uintx, InitialRAMFraction, 64, \ 2088 "Fraction (1/n) of real memory used for initial heap size") \ 2089 \ 2090 develop(uintx, MaxVirtMemFraction, 2, \ 2091 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2092 "determining maximum heap size") \ 2093 \ 2094 product(bool, UseAutoGCSelectPolicy, false, \ 2095 "Use automatic collection selection policy") \ 2096 \ 2097 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2098 "Automatic GC selection pause threshold in milliseconds") \ 2099 \ 2100 product(bool, UseAdaptiveSizePolicy, true, \ 2101 "Use adaptive generation sizing policies") \ 2102 \ 2103 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2104 "Use adaptive survivor sizing policies") \ 2105 \ 2106 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2107 "Use adaptive young-old sizing policies at minor collections") \ 2108 \ 2109 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2110 "Use adaptive young-old sizing policies at major collections") \ 2111 \ 2112 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2113 "Include statistics from System.gc() for adaptive size policy") \ 2114 \ 2115 product(bool, UseAdaptiveGCBoundary, false, \ 2116 "Allow young-old boundary to move") \ 2117 \ 2118 develop(bool, TraceAdaptiveGCBoundary, false, \ 2119 "Trace young-old boundary moves") \ 2120 \ 2121 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2122 "Resize the virtual spaces of the young or old generations") \ 2123 \ 2124 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2125 "Policy for changing generation size for throughput goals") \ 2126 \ 2127 product(uintx, AdaptiveSizePausePolicy, 0, \ 2128 "Policy for changing generation size for pause goals") \ 2129 \ 2130 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2131 "Adjust tenured generation to achieve a minor pause goal") \ 2132 \ 2133 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2134 "Adjust young generation to achieve a major pause goal") \ 2135 \ 2136 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2137 "Number of steps where heuristics is used before data is used") \ 2138 \ 2139 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2140 "Number of collections before the adaptive sizing is started") \ 2141 \ 2142 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2143 "Collection interval for printing information; zero means never") \ 2144 \ 2145 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2146 "Use adaptive minimum footprint as a goal") \ 2147 \ 2148 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2149 "Weight given to exponential resizing, between 0 and 100") \ 2150 \ 2151 product(uintx, AdaptiveTimeWeight, 25, \ 2152 "Weight given to time in adaptive policy, between 0 and 100") \ 2153 \ 2154 product(uintx, PausePadding, 1, \ 2155 "How much buffer to keep for pause time") \ 2156 \ 2157 product(uintx, PromotedPadding, 3, \ 2158 "How much buffer to keep for promotion failure") \ 2159 \ 2160 product(uintx, SurvivorPadding, 3, \ 2161 "How much buffer to keep for survivor overflow") \ 2162 \ 2163 product(uintx, ThresholdTolerance, 10, \ 2164 "Allowed collection cost difference between generations") \ 2165 \ 2166 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2167 "If collection costs are within margin, reduce both by full " \ 2168 "delta") \ 2169 \ 2170 product(uintx, YoungGenerationSizeIncrement, 20, \ 2171 "Adaptive size percentage change in young generation") \ 2172 \ 2173 product(uintx, YoungGenerationSizeSupplement, 80, \ 2174 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2175 \ 2176 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2177 "Decay factor to YoungedGenerationSizeSupplement") \ 2178 \ 2179 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2180 "Adaptive size percentage change in tenured generation") \ 2181 \ 2182 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2183 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2184 \ 2185 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2186 "Decay factor to TenuredGenerationSizeIncrement") \ 2187 \ 2188 product(uintx, MaxGCPauseMillis, max_uintx, \ 2189 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2190 "or (G1 Only) the maximum GC time per MMU time slice") \ 2191 \ 2192 product(uintx, GCPauseIntervalMillis, 0, \ 2193 "Time slice for MMU specification") \ 2194 \ 2195 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2196 "Adaptive size policy maximum GC minor pause time goal " \ 2197 "in millisecond") \ 2198 \ 2199 product(uintx, GCTimeRatio, 99, \ 2200 "Adaptive size policy application time to GC time ratio") \ 2201 \ 2202 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2203 "Adaptive size scale down factor for shrinking") \ 2204 \ 2205 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2206 "Adaptive size decays the major cost for long major intervals") \ 2207 \ 2208 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2209 "Time scale over which major costs decay") \ 2210 \ 2211 product(uintx, MinSurvivorRatio, 3, \ 2212 "Minimum ratio of young generation/survivor space size") \ 2213 \ 2214 product(uintx, InitialSurvivorRatio, 8, \ 2215 "Initial ratio of young generation/survivor space size") \ 2216 \ 2217 product(uintx, BaseFootPrintEstimate, 256*M, \ 2218 "Estimate of footprint other than Java Heap") \ 2219 \ 2220 product(bool, UseGCOverheadLimit, true, \ 2221 "Use policy to limit of proportion of time spent in GC " \ 2222 "before an OutOfMemory error is thrown") \ 2223 \ 2224 product(uintx, GCTimeLimit, 98, \ 2225 "Limit of the proportion of time spent in GC before " \ 2226 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2227 \ 2228 product(uintx, GCHeapFreeLimit, 2, \ 2229 "Minimum percentage of free space after a full GC before an " \ 2230 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2231 \ 2232 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2233 "Number of consecutive collections before gc time limit fires") \ 2234 \ 2235 product(bool, PrintAdaptiveSizePolicy, false, \ 2236 "Print information about AdaptiveSizePolicy") \ 2237 \ 2238 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2239 "How far ahead to prefetch destination area (<= 0 means off)") \ 2240 \ 2241 product(intx, PrefetchScanIntervalInBytes, -1, \ 2242 "How far ahead to prefetch scan area (<= 0 means off)") \ 2243 \ 2244 product(intx, PrefetchFieldsAhead, -1, \ 2245 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2246 \ 2247 diagnostic(bool, VerifySilently, false, \ 2248 "Do not print the verification progress") \ 2249 \ 2250 diagnostic(bool, VerifyDuringStartup, false, \ 2251 "Verify memory system before executing any Java code " \ 2252 "during VM initialization") \ 2253 \ 2254 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2255 "Verify system before exiting") \ 2256 \ 2257 diagnostic(bool, VerifyBeforeGC, false, \ 2258 "Verify memory system before GC") \ 2259 \ 2260 diagnostic(bool, VerifyAfterGC, false, \ 2261 "Verify memory system after GC") \ 2262 \ 2263 diagnostic(bool, VerifyDuringGC, false, \ 2264 "Verify memory system during GC (between phases)") \ 2265 \ 2266 diagnostic(ccstrlist, VerifySubSet, "", \ 2267 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2268 "are enabled. One or more sub-systems can be specified " \ 2269 "in a comma separated string. Sub-systems are: " \ 2270 "threads, heap, symbol_table, string_table, codecache, " \ 2271 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2272 "c-heap, codecache_oops") \ 2273 \ 2274 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2275 "Enable parallel memory system verification") \ 2276 \ 2277 diagnostic(bool, DeferInitialCardMark, false, \ 2278 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2279 "may arise from new_pre_store_barrier") \ 2280 \ 2281 diagnostic(bool, VerifyRememberedSets, false, \ 2282 "Verify GC remembered sets") \ 2283 \ 2284 diagnostic(bool, VerifyObjectStartArray, true, \ 2285 "Verify GC object start array if verify before/after") \ 2286 \ 2287 product(bool, DisableExplicitGC, false, \ 2288 "Ignore calls to System.gc()") \ 2289 \ 2290 notproduct(bool, CheckMemoryInitialization, false, \ 2291 "Check memory initialization") \ 2292 \ 2293 product(bool, CollectGen0First, false, \ 2294 "Collect youngest generation before each full GC") \ 2295 \ 2296 diagnostic(bool, BindCMSThreadToCPU, false, \ 2297 "Bind CMS Thread to CPU if possible") \ 2298 \ 2299 diagnostic(uintx, CPUForCMSThread, 0, \ 2300 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2301 \ 2302 product(bool, BindGCTaskThreadsToCPUs, false, \ 2303 "Bind GCTaskThreads to CPUs if possible") \ 2304 \ 2305 product(bool, UseGCTaskAffinity, false, \ 2306 "Use worker affinity when asking for GCTasks") \ 2307 \ 2308 product(uintx, ProcessDistributionStride, 4, \ 2309 "Stride through processors when distributing processes") \ 2310 \ 2311 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2312 "Number of times the coordinator GC thread will sleep while " \ 2313 "yielding before giving up and resuming GC") \ 2314 \ 2315 product(uintx, CMSYieldSleepCount, 0, \ 2316 "Number of times a GC thread (minus the coordinator) " \ 2317 "will sleep while yielding before giving up and resuming GC") \ 2318 \ 2319 /* gc tracing */ \ 2320 manageable(bool, PrintGC, false, \ 2321 "Print message at garbage collection") \ 2322 \ 2323 manageable(bool, PrintGCDetails, false, \ 2324 "Print more details at garbage collection") \ 2325 \ 2326 manageable(bool, PrintGCDateStamps, false, \ 2327 "Print date stamps at garbage collection") \ 2328 \ 2329 manageable(bool, PrintGCTimeStamps, false, \ 2330 "Print timestamps at garbage collection") \ 2331 \ 2332 manageable(bool, PrintGCID, false, \ 2333 "Print an identifier for each garbage collection") \ 2334 \ 2335 product(bool, PrintGCTaskTimeStamps, false, \ 2336 "Print timestamps for individual gc worker thread tasks") \ 2337 \ 2338 develop(intx, ConcGCYieldTimeout, 0, \ 2339 "If non-zero, assert that GC threads yield within this " \ 2340 "number of milliseconds") \ 2341 \ 2342 notproduct(bool, TraceMarkSweep, false, \ 2343 "Trace mark sweep") \ 2344 \ 2345 product(bool, PrintReferenceGC, false, \ 2346 "Print times spent handling reference objects during GC " \ 2347 "(enabled only when PrintGCDetails)") \ 2348 \ 2349 develop(bool, TraceReferenceGC, false, \ 2350 "Trace handling of soft/weak/final/phantom references") \ 2351 \ 2352 develop(bool, TraceFinalizerRegistration, false, \ 2353 "Trace registration of final references") \ 2354 \ 2355 notproduct(bool, TraceScavenge, false, \ 2356 "Trace scavenge") \ 2357 \ 2358 product(bool, IgnoreEmptyClassPaths, false, \ 2359 "Ignore empty path elements in -classpath") \ 2360 \ 2361 product(bool, TraceClassPaths, false, \ 2362 "Trace processing of class paths") \ 2363 \ 2364 product_rw(bool, TraceClassLoading, false, \ 2365 "Trace all classes loaded") \ 2366 \ 2367 product(bool, TraceClassLoadingPreorder, false, \ 2368 "Trace all classes loaded in order referenced (not loaded)") \ 2369 \ 2370 product_rw(bool, TraceClassUnloading, false, \ 2371 "Trace unloading of classes") \ 2372 \ 2373 product_rw(bool, TraceLoaderConstraints, false, \ 2374 "Trace loader constraints") \ 2375 \ 2376 develop(bool, TraceClassLoaderData, false, \ 2377 "Trace class loader loader_data lifetime") \ 2378 \ 2379 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2380 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2381 "Initial size of the boot class loader data metaspace") \ 2382 \ 2383 product(bool, TraceGen0Time, false, \ 2384 "Trace accumulated time for Gen 0 collection") \ 2385 \ 2386 product(bool, TraceGen1Time, false, \ 2387 "Trace accumulated time for Gen 1 collection") \ 2388 \ 2389 product(bool, PrintTenuringDistribution, false, \ 2390 "Print tenuring age information") \ 2391 \ 2392 product_rw(bool, PrintHeapAtGC, false, \ 2393 "Print heap layout before and after each GC") \ 2394 \ 2395 product_rw(bool, PrintHeapAtGCExtended, false, \ 2396 "Print extended information about the layout of the heap " \ 2397 "when -XX:+PrintHeapAtGC is set") \ 2398 \ 2399 product(bool, PrintHeapAtSIGBREAK, true, \ 2400 "Print heap layout in response to SIGBREAK") \ 2401 \ 2402 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2403 "Print a class histogram before any major stop-world GC") \ 2404 \ 2405 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2406 "Print a class histogram after any major stop-world GC") \ 2407 \ 2408 manageable(bool, PrintClassHistogram, false, \ 2409 "Print a histogram of class instances") \ 2410 \ 2411 develop(bool, TraceWorkGang, false, \ 2412 "Trace activities of work gangs") \ 2413 \ 2414 product(bool, TraceParallelOldGCTasks, false, \ 2415 "Trace multithreaded GC activity") \ 2416 \ 2417 develop(bool, TraceBlockOffsetTable, false, \ 2418 "Print BlockOffsetTable maps") \ 2419 \ 2420 develop(bool, TraceCardTableModRefBS, false, \ 2421 "Print CardTableModRefBS maps") \ 2422 \ 2423 develop(bool, TraceGCTaskManager, false, \ 2424 "Trace actions of the GC task manager") \ 2425 \ 2426 develop(bool, TraceGCTaskQueue, false, \ 2427 "Trace actions of the GC task queues") \ 2428 \ 2429 diagnostic(bool, TraceGCTaskThread, false, \ 2430 "Trace actions of the GC task threads") \ 2431 \ 2432 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2433 "Print the time taken by each phase in ParallelOldGC " \ 2434 "(PrintGCDetails must also be enabled)") \ 2435 \ 2436 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2437 "Trace marking phase in ParallelOldGC") \ 2438 \ 2439 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2440 "Trace summary phase in ParallelOldGC") \ 2441 \ 2442 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2443 "Trace compaction phase in ParallelOldGC") \ 2444 \ 2445 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2446 "Trace dense prefix computation for ParallelOldGC") \ 2447 \ 2448 develop(bool, IgnoreLibthreadGPFault, false, \ 2449 "Suppress workaround for libthread GP fault") \ 2450 \ 2451 product(bool, PrintJNIGCStalls, false, \ 2452 "Print diagnostic message when GC is stalled " \ 2453 "by JNI critical section") \ 2454 \ 2455 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2456 "The percentage of the used heap that the instances of a class " \ 2457 "must occupy for the class to generate a trace event") \ 2458 \ 2459 /* GC log rotation setting */ \ 2460 \ 2461 product(bool, UseGCLogFileRotation, false, \ 2462 "Rotate gclog files (for long running applications). It requires "\ 2463 "-Xloggc:<filename>") \ 2464 \ 2465 product(uintx, NumberOfGCLogFiles, 0, \ 2466 "Number of gclog files in rotation " \ 2467 "(default: 0, no rotation)") \ 2468 \ 2469 product(uintx, GCLogFileSize, 8*K, \ 2470 "GC log file size, requires UseGCLogFileRotation. " \ 2471 "Set to 0 to only trigger rotation via jcmd") \ 2472 \ 2473 /* JVMTI heap profiling */ \ 2474 \ 2475 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2476 "Trace JVMTI object tagging calls") \ 2477 \ 2478 diagnostic(bool, VerifyBeforeIteration, false, \ 2479 "Verify memory system before JVMTI iteration") \ 2480 \ 2481 /* compiler interface */ \ 2482 \ 2483 develop(bool, CIPrintCompilerName, false, \ 2484 "when CIPrint is active, print the name of the active compiler") \ 2485 \ 2486 develop(bool, CIPrintCompileQueue, false, \ 2487 "display the contents of the compile queue whenever a " \ 2488 "compilation is enqueued") \ 2489 \ 2490 develop(bool, CIPrintRequests, false, \ 2491 "display every request for compilation") \ 2492 \ 2493 product(bool, CITime, false, \ 2494 "collect timing information for compilation") \ 2495 \ 2496 develop(bool, CITimeEach, false, \ 2497 "display timing information after each successful compilation") \ 2498 \ 2499 develop(bool, CICountOSR, false, \ 2500 "use a separate counter when assigning ids to osr compilations") \ 2501 \ 2502 develop(bool, CICompileNatives, true, \ 2503 "compile native methods if supported by the compiler") \ 2504 \ 2505 develop_pd(bool, CICompileOSR, \ 2506 "compile on stack replacement methods if supported by the " \ 2507 "compiler") \ 2508 \ 2509 develop(bool, CIPrintMethodCodes, false, \ 2510 "print method bytecodes of the compiled code") \ 2511 \ 2512 develop(bool, CIPrintTypeFlow, false, \ 2513 "print the results of ciTypeFlow analysis") \ 2514 \ 2515 develop(bool, CITraceTypeFlow, false, \ 2516 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2517 \ 2518 develop(intx, OSROnlyBCI, -1, \ 2519 "OSR only at this bci. Negative values mean exclude that bci") \ 2520 \ 2521 /* compiler */ \ 2522 \ 2523 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2524 "Number of compiler threads to run") \ 2525 \ 2526 product(intx, CompilationPolicyChoice, 0, \ 2527 "which compilation policy (0/1)") \ 2528 \ 2529 develop(bool, UseStackBanging, true, \ 2530 "use stack banging for stack overflow checks (required for " \ 2531 "proper StackOverflow handling; disable only to measure cost " \ 2532 "of stackbanging)") \ 2533 \ 2534 develop(bool, UseStrictFP, true, \ 2535 "use strict fp if modifier strictfp is set") \ 2536 \ 2537 develop(bool, GenerateSynchronizationCode, true, \ 2538 "generate locking/unlocking code for synchronized methods and " \ 2539 "monitors") \ 2540 \ 2541 develop(bool, GenerateCompilerNullChecks, true, \ 2542 "Generate explicit null checks for loads/stores/calls") \ 2543 \ 2544 develop(bool, GenerateRangeChecks, true, \ 2545 "Generate range checks for array accesses") \ 2546 \ 2547 develop_pd(bool, ImplicitNullChecks, \ 2548 "Generate code for implicit null checks") \ 2549 \ 2550 product_pd(bool, TrapBasedNullChecks, \ 2551 "Generate code for null checks that uses a cmp and trap " \ 2552 "instruction raising SIGTRAP. This is only used if an access to" \ 2553 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2554 "ImplicitNullChecks don't work (PPC64).") \ 2555 \ 2556 product(bool, PrintSafepointStatistics, false, \ 2557 "Print statistics about safepoint synchronization") \ 2558 \ 2559 product(intx, PrintSafepointStatisticsCount, 300, \ 2560 "Total number of safepoint statistics collected " \ 2561 "before printing them out") \ 2562 \ 2563 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2564 "Print safepoint statistics only when safepoint takes " \ 2565 "more than PrintSafepointSatisticsTimeout in millis") \ 2566 \ 2567 product(bool, TraceSafepointCleanupTime, false, \ 2568 "Print the break down of clean up tasks performed during " \ 2569 "safepoint") \ 2570 \ 2571 product(bool, Inline, true, \ 2572 "Enable inlining") \ 2573 \ 2574 product(bool, ClipInlining, true, \ 2575 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2576 \ 2577 develop(bool, UseCHA, true, \ 2578 "Enable CHA") \ 2579 \ 2580 product(bool, UseTypeProfile, true, \ 2581 "Check interpreter profile for historically monomorphic calls") \ 2582 \ 2583 notproduct(bool, TimeCompiler, false, \ 2584 "Time the compiler") \ 2585 \ 2586 diagnostic(bool, PrintInlining, false, \ 2587 "Print inlining optimizations") \ 2588 \ 2589 product(bool, UsePopCountInstruction, false, \ 2590 "Use population count instruction") \ 2591 \ 2592 develop(bool, EagerInitialization, false, \ 2593 "Eagerly initialize classes if possible") \ 2594 \ 2595 develop(bool, TraceMethodReplacement, false, \ 2596 "Print when methods are replaced do to recompilation") \ 2597 \ 2598 develop(bool, PrintMethodFlushing, false, \ 2599 "Print the nmethods being flushed") \ 2600 \ 2601 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2602 "print statistics about method flushing") \ 2603 \ 2604 develop(bool, UseRelocIndex, false, \ 2605 "Use an index to speed random access to relocations") \ 2606 \ 2607 develop(bool, StressCodeBuffers, false, \ 2608 "Exercise code buffer expansion and other rare state changes") \ 2609 \ 2610 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2611 "Generate extra debugging information for non-safepoints in " \ 2612 "nmethods") \ 2613 \ 2614 product(bool, PrintVMOptions, false, \ 2615 "Print flags that appeared on the command line") \ 2616 \ 2617 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2618 "Ignore unrecognized VM options") \ 2619 \ 2620 product(bool, PrintCommandLineFlags, false, \ 2621 "Print flags specified on command line or set by ergonomics") \ 2622 \ 2623 product(bool, PrintFlagsInitial, false, \ 2624 "Print all VM flags before argument processing and exit VM") \ 2625 \ 2626 product(bool, PrintFlagsFinal, false, \ 2627 "Print all VM flags after argument and ergonomic processing") \ 2628 \ 2629 notproduct(bool, PrintFlagsWithComments, false, \ 2630 "Print all VM flags with default values and descriptions and " \ 2631 "exit") \ 2632 \ 2633 diagnostic(bool, SerializeVMOutput, true, \ 2634 "Use a mutex to serialize output to tty and LogFile") \ 2635 \ 2636 diagnostic(bool, DisplayVMOutput, true, \ 2637 "Display all VM output on the tty, independently of LogVMOutput") \ 2638 \ 2639 diagnostic(bool, LogVMOutput, false, \ 2640 "Save VM output to LogFile") \ 2641 \ 2642 diagnostic(ccstr, LogFile, NULL, \ 2643 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2644 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2645 \ 2646 product(ccstr, ErrorFile, NULL, \ 2647 "If an error occurs, save the error data to this file " \ 2648 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2649 \ 2650 product(bool, DisplayVMOutputToStderr, false, \ 2651 "If DisplayVMOutput is true, display all VM output to stderr") \ 2652 \ 2653 product(bool, DisplayVMOutputToStdout, false, \ 2654 "If DisplayVMOutput is true, display all VM output to stdout") \ 2655 \ 2656 product(bool, UseHeavyMonitors, false, \ 2657 "use heavyweight instead of lightweight Java monitors") \ 2658 \ 2659 product(bool, PrintStringTableStatistics, false, \ 2660 "print statistics about the StringTable and SymbolTable") \ 2661 \ 2662 diagnostic(bool, VerifyStringTableAtExit, false, \ 2663 "verify StringTable contents at exit") \ 2664 \ 2665 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2666 "print histogram of the symbol table") \ 2667 \ 2668 notproduct(bool, ExitVMOnVerifyError, false, \ 2669 "standard exit from VM if bytecode verify error " \ 2670 "(only in debug mode)") \ 2671 \ 2672 notproduct(ccstr, AbortVMOnException, NULL, \ 2673 "Call fatal if this exception is thrown. Example: " \ 2674 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2675 \ 2676 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2677 "Call fatal if the exception pointed by AbortVMOnException " \ 2678 "has this message") \ 2679 \ 2680 develop(bool, DebugVtables, false, \ 2681 "add debugging code to vtable dispatch") \ 2682 \ 2683 develop(bool, PrintVtables, false, \ 2684 "print vtables when printing klass") \ 2685 \ 2686 notproduct(bool, PrintVtableStats, false, \ 2687 "print vtables stats at end of run") \ 2688 \ 2689 develop(bool, TraceCreateZombies, false, \ 2690 "trace creation of zombie nmethods") \ 2691 \ 2692 notproduct(bool, IgnoreLockingAssertions, false, \ 2693 "disable locking assertions (for speed)") \ 2694 \ 2695 product(bool, RangeCheckElimination, true, \ 2696 "Eliminate range checks") \ 2697 \ 2698 develop_pd(bool, UncommonNullCast, \ 2699 "track occurrences of null in casts; adjust compiler tactics") \ 2700 \ 2701 develop(bool, TypeProfileCasts, true, \ 2702 "treat casts like calls for purposes of type profiling") \ 2703 \ 2704 develop(bool, DelayCompilationDuringStartup, true, \ 2705 "Delay invoking the compiler until main application class is " \ 2706 "loaded") \ 2707 \ 2708 develop(bool, CompileTheWorld, false, \ 2709 "Compile all methods in all classes in bootstrap class path " \ 2710 "(stress test)") \ 2711 \ 2712 develop(bool, CompileTheWorldPreloadClasses, true, \ 2713 "Preload all classes used by a class before start loading") \ 2714 \ 2715 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2716 "Force a safepoint every n compiles so sweeper can keep up") \ 2717 \ 2718 develop(bool, FillDelaySlots, true, \ 2719 "Fill delay slots (on SPARC only)") \ 2720 \ 2721 develop(bool, TimeLivenessAnalysis, false, \ 2722 "Time computation of bytecode liveness analysis") \ 2723 \ 2724 develop(bool, TraceLivenessGen, false, \ 2725 "Trace the generation of liveness analysis information") \ 2726 \ 2727 notproduct(bool, TraceLivenessQuery, false, \ 2728 "Trace queries of liveness analysis information") \ 2729 \ 2730 notproduct(bool, CollectIndexSetStatistics, false, \ 2731 "Collect information about IndexSets") \ 2732 \ 2733 develop(bool, UseLoopSafepoints, true, \ 2734 "Generate Safepoint nodes in every loop") \ 2735 \ 2736 develop(intx, FastAllocateSizeLimit, 128*K, \ 2737 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2738 "Inline allocations larger than this in doublewords must go slow")\ 2739 \ 2740 product(bool, AggressiveOpts, false, \ 2741 "Enable aggressive optimizations - see arguments.cpp") \ 2742 \ 2743 product_pd(uintx, TypeProfileLevel, \ 2744 "=XYZ, with Z: Type profiling of arguments at call; " \ 2745 "Y: Type profiling of return value at call; " \ 2746 "X: Type profiling of parameters to methods; " \ 2747 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2748 \ 2749 product(intx, TypeProfileArgsLimit, 2, \ 2750 "max number of call arguments to consider for type profiling") \ 2751 \ 2752 product(intx, TypeProfileParmsLimit, 2, \ 2753 "max number of incoming parameters to consider for type profiling"\ 2754 ", -1 for all") \ 2755 \ 2756 /* statistics */ \ 2757 develop(bool, CountCompiledCalls, false, \ 2758 "Count method invocations") \ 2759 \ 2760 notproduct(bool, CountRuntimeCalls, false, \ 2761 "Count VM runtime calls") \ 2762 \ 2763 develop(bool, CountJNICalls, false, \ 2764 "Count jni method invocations") \ 2765 \ 2766 notproduct(bool, CountJVMCalls, false, \ 2767 "Count jvm method invocations") \ 2768 \ 2769 notproduct(bool, CountRemovableExceptions, false, \ 2770 "Count exceptions that could be replaced by branches due to " \ 2771 "inlining") \ 2772 \ 2773 notproduct(bool, ICMissHistogram, false, \ 2774 "Produce histogram of IC misses") \ 2775 \ 2776 notproduct(bool, PrintClassStatistics, false, \ 2777 "Print class statistics at end of run") \ 2778 \ 2779 notproduct(bool, PrintMethodStatistics, false, \ 2780 "Print method statistics at end of run") \ 2781 \ 2782 /* interpreter */ \ 2783 develop(bool, ClearInterpreterLocals, false, \ 2784 "Always clear local variables of interpreter activations upon " \ 2785 "entry") \ 2786 \ 2787 product_pd(bool, RewriteBytecodes, \ 2788 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2789 \ 2790 product_pd(bool, RewriteFrequentPairs, \ 2791 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2792 \ 2793 diagnostic(bool, PrintInterpreter, false, \ 2794 "Print the generated interpreter code") \ 2795 \ 2796 product(bool, UseInterpreter, true, \ 2797 "Use interpreter for non-compiled methods") \ 2798 \ 2799 develop(bool, UseFastSignatureHandlers, true, \ 2800 "Use fast signature handlers for native calls") \ 2801 \ 2802 product(bool, UseLoopCounter, true, \ 2803 "Increment invocation counter on backward branch") \ 2804 \ 2805 product(bool, UseFastEmptyMethods, true, \ 2806 "Use fast method entry code for empty methods") \ 2807 \ 2808 product(bool, UseFastAccessorMethods, true, \ 2809 "Use fast method entry code for accessor methods") \ 2810 \ 2811 product_pd(bool, UseOnStackReplacement, \ 2812 "Use on stack replacement, calls runtime if invoc. counter " \ 2813 "overflows in loop") \ 2814 \ 2815 notproduct(bool, TraceOnStackReplacement, false, \ 2816 "Trace on stack replacement") \ 2817 \ 2818 product_pd(bool, PreferInterpreterNativeStubs, \ 2819 "Use always interpreter stubs for native methods invoked via " \ 2820 "interpreter") \ 2821 \ 2822 develop(bool, CountBytecodes, false, \ 2823 "Count number of bytecodes executed") \ 2824 \ 2825 develop(bool, PrintBytecodeHistogram, false, \ 2826 "Print histogram of the executed bytecodes") \ 2827 \ 2828 develop(bool, PrintBytecodePairHistogram, false, \ 2829 "Print histogram of the executed bytecode pairs") \ 2830 \ 2831 diagnostic(bool, PrintSignatureHandlers, false, \ 2832 "Print code generated for native method signature handlers") \ 2833 \ 2834 develop(bool, VerifyOops, false, \ 2835 "Do plausibility checks for oops") \ 2836 \ 2837 develop(bool, CheckUnhandledOops, false, \ 2838 "Check for unhandled oops in VM code") \ 2839 \ 2840 develop(bool, VerifyJNIFields, trueInDebug, \ 2841 "Verify jfieldIDs for instance fields") \ 2842 \ 2843 notproduct(bool, VerifyJNIEnvThread, false, \ 2844 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2845 "from JNI") \ 2846 \ 2847 develop(bool, VerifyFPU, false, \ 2848 "Verify FPU state (check for NaN's, etc.)") \ 2849 \ 2850 develop(bool, VerifyThread, false, \ 2851 "Watch the thread register for corruption (SPARC only)") \ 2852 \ 2853 develop(bool, VerifyActivationFrameSize, false, \ 2854 "Verify that activation frame didn't become smaller than its " \ 2855 "minimal size") \ 2856 \ 2857 develop(bool, TraceFrequencyInlining, false, \ 2858 "Trace frequency based inlining") \ 2859 \ 2860 develop_pd(bool, InlineIntrinsics, \ 2861 "Inline intrinsics that can be statically resolved") \ 2862 \ 2863 product_pd(bool, ProfileInterpreter, \ 2864 "Profile at the bytecode level during interpretation") \ 2865 \ 2866 develop(bool, TraceProfileInterpreter, false, \ 2867 "Trace profiling at the bytecode level during interpretation. " \ 2868 "This outputs the profiling information collected to improve " \ 2869 "jit compilation.") \ 2870 \ 2871 develop_pd(bool, ProfileTraps, \ 2872 "Profile deoptimization traps at the bytecode level") \ 2873 \ 2874 product(intx, ProfileMaturityPercentage, 20, \ 2875 "number of method invocations/branches (expressed as % of " \ 2876 "CompileThreshold) before using the method's profile") \ 2877 \ 2878 develop(bool, PrintMethodData, false, \ 2879 "Print the results of +ProfileInterpreter at end of run") \ 2880 \ 2881 develop(bool, VerifyDataPointer, trueInDebug, \ 2882 "Verify the method data pointer during interpreter profiling") \ 2883 \ 2884 develop(bool, VerifyCompiledCode, false, \ 2885 "Include miscellaneous runtime verifications in nmethod code; " \ 2886 "default off because it disturbs nmethod size heuristics") \ 2887 \ 2888 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2889 "Manually make GC thread crash then dump java stack trace; " \ 2890 "Test only") \ 2891 \ 2892 /* compilation */ \ 2893 product(bool, UseCompiler, true, \ 2894 "Use Just-In-Time compilation") \ 2895 \ 2896 develop(bool, TraceCompilationPolicy, false, \ 2897 "Trace compilation policy") \ 2898 \ 2899 develop(bool, TimeCompilationPolicy, false, \ 2900 "Time the compilation policy") \ 2901 \ 2902 product(bool, UseCounterDecay, true, \ 2903 "Adjust recompilation counters") \ 2904 \ 2905 develop(intx, CounterHalfLifeTime, 30, \ 2906 "Half-life time of invocation counters (in seconds)") \ 2907 \ 2908 develop(intx, CounterDecayMinIntervalLength, 500, \ 2909 "The minimum interval (in milliseconds) between invocation of " \ 2910 "CounterDecay") \ 2911 \ 2912 product(bool, AlwaysCompileLoopMethods, false, \ 2913 "When using recompilation, never interpret methods " \ 2914 "containing loops") \ 2915 \ 2916 product(bool, DontCompileHugeMethods, true, \ 2917 "Do not compile methods > HugeMethodLimit") \ 2918 \ 2919 /* Bytecode escape analysis estimation. */ \ 2920 product(bool, EstimateArgEscape, true, \ 2921 "Analyze bytecodes to estimate escape state of arguments") \ 2922 \ 2923 product(intx, BCEATraceLevel, 0, \ 2924 "How much tracing to do of bytecode escape analysis estimates") \ 2925 \ 2926 product(intx, MaxBCEAEstimateLevel, 5, \ 2927 "Maximum number of nested calls that are analyzed by BC EA") \ 2928 \ 2929 product(intx, MaxBCEAEstimateSize, 150, \ 2930 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2931 \ 2932 product(intx, AllocatePrefetchStyle, 1, \ 2933 "0 = no prefetch, " \ 2934 "1 = prefetch instructions for each allocation, " \ 2935 "2 = use TLAB watermark to gate allocation prefetch, " \ 2936 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2937 \ 2938 product(intx, AllocatePrefetchDistance, -1, \ 2939 "Distance to prefetch ahead of allocation pointer") \ 2940 \ 2941 product(intx, AllocatePrefetchLines, 3, \ 2942 "Number of lines to prefetch ahead of array allocation pointer") \ 2943 \ 2944 product(intx, AllocateInstancePrefetchLines, 1, \ 2945 "Number of lines to prefetch ahead of instance allocation " \ 2946 "pointer") \ 2947 \ 2948 product(intx, AllocatePrefetchStepSize, 16, \ 2949 "Step size in bytes of sequential prefetch instructions") \ 2950 \ 2951 product(intx, AllocatePrefetchInstr, 0, \ 2952 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2953 \ 2954 /* deoptimization */ \ 2955 develop(bool, TraceDeoptimization, false, \ 2956 "Trace deoptimization") \ 2957 \ 2958 develop(bool, DebugDeoptimization, false, \ 2959 "Tracing various information while debugging deoptimization") \ 2960 \ 2961 product(intx, SelfDestructTimer, 0, \ 2962 "Will cause VM to terminate after a given time (in minutes) " \ 2963 "(0 means off)") \ 2964 \ 2965 product(intx, MaxJavaStackTraceDepth, 1024, \ 2966 "The maximum number of lines in the stack trace for Java " \ 2967 "exceptions (0 means all)") \ 2968 \ 2969 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2970 "Guarantee a safepoint (at least) every so many milliseconds " \ 2971 "(0 means none)")) \ 2972 \ 2973 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2974 "Guarantee a safepoint (at least) every so many milliseconds " \ 2975 "(0 means none)")) \ 2976 \ 2977 product(intx, SafepointTimeoutDelay, 10000, \ 2978 "Delay in milliseconds for option SafepointTimeout") \ 2979 \ 2980 product(intx, NmethodSweepFraction, 16, \ 2981 "Number of invocations of sweeper to cover all nmethods") \ 2982 \ 2983 product(intx, NmethodSweepCheckInterval, 5, \ 2984 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2985 \ 2986 product(intx, NmethodSweepActivity, 10, \ 2987 "Removes cold nmethods from code cache if > 0. Higher values " \ 2988 "result in more aggressive sweeping") \ 2989 \ 2990 notproduct(bool, LogSweeper, false, \ 2991 "Keep a ring buffer of sweeper activity") \ 2992 \ 2993 notproduct(intx, SweeperLogEntries, 1024, \ 2994 "Number of records in the ring buffer of sweeper activity") \ 2995 \ 2996 notproduct(intx, MemProfilingInterval, 500, \ 2997 "Time between each invocation of the MemProfiler") \ 2998 \ 2999 develop(intx, MallocCatchPtr, -1, \ 3000 "Hit breakpoint when mallocing/freeing this pointer") \ 3001 \ 3002 notproduct(intx, AssertRepeat, 1, \ 3003 "number of times to evaluate expression in assert " \ 3004 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3005 \ 3006 notproduct(ccstrlist, SuppressErrorAt, "", \ 3007 "List of assertions (file:line) to muzzle") \ 3008 \ 3009 notproduct(uintx, HandleAllocationLimit, 1024, \ 3010 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3011 "is used") \ 3012 \ 3013 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3014 "Threshold for total handle allocation when " \ 3015 "+TraceHandleAllocation is used") \ 3016 \ 3017 develop(intx, StackPrintLimit, 100, \ 3018 "number of stack frames to print in VM-level stack dump") \ 3019 \ 3020 notproduct(intx, MaxElementPrintSize, 256, \ 3021 "maximum number of elements to print") \ 3022 \ 3023 notproduct(intx, MaxSubklassPrintSize, 4, \ 3024 "maximum number of subklasses to print when printing klass") \ 3025 \ 3026 product(intx, MaxInlineLevel, 9, \ 3027 "maximum number of nested calls that are inlined") \ 3028 \ 3029 product(intx, MaxRecursiveInlineLevel, 1, \ 3030 "maximum number of nested recursive calls that are inlined") \ 3031 \ 3032 develop(intx, MaxForceInlineLevel, 100, \ 3033 "maximum number of nested calls that are forced for inlining " \ 3034 "(using CompilerOracle or marked w/ @ForceInline)") \ 3035 \ 3036 product_pd(intx, InlineSmallCode, \ 3037 "Only inline already compiled methods if their code size is " \ 3038 "less than this") \ 3039 \ 3040 product(intx, MaxInlineSize, 35, \ 3041 "The maximum bytecode size of a method to be inlined") \ 3042 \ 3043 product_pd(intx, FreqInlineSize, \ 3044 "The maximum bytecode size of a frequent method to be inlined") \ 3045 \ 3046 product(intx, MaxTrivialSize, 6, \ 3047 "The maximum bytecode size of a trivial method to be inlined") \ 3048 \ 3049 product(intx, MinInliningThreshold, 250, \ 3050 "The minimum invocation count a method needs to have to be " \ 3051 "inlined") \ 3052 \ 3053 develop(intx, MethodHistogramCutoff, 100, \ 3054 "The cutoff value for method invocation histogram (+CountCalls)") \ 3055 \ 3056 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3057 "Number of interpreted methods to show in profile") \ 3058 \ 3059 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3060 "Number of compiled methods to show in profile") \ 3061 \ 3062 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3063 "Number of stub methods to show in profile") \ 3064 \ 3065 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3066 "Number of runtime stub nodes to show in profile") \ 3067 \ 3068 product(intx, ProfileIntervalsTicks, 100, \ 3069 "Number of ticks between printing of interval profile " \ 3070 "(+ProfileIntervals)") \ 3071 \ 3072 notproduct(intx, ScavengeALotInterval, 1, \ 3073 "Interval between which scavenge will occur with +ScavengeALot") \ 3074 \ 3075 notproduct(intx, FullGCALotInterval, 1, \ 3076 "Interval between which full gc will occur with +FullGCALot") \ 3077 \ 3078 notproduct(intx, FullGCALotStart, 0, \ 3079 "For which invocation to start FullGCAlot") \ 3080 \ 3081 notproduct(intx, FullGCALotDummies, 32*K, \ 3082 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3083 "to move") \ 3084 \ 3085 develop(intx, DontYieldALotInterval, 10, \ 3086 "Interval between which yields will be dropped (milliseconds)") \ 3087 \ 3088 develop(intx, MinSleepInterval, 1, \ 3089 "Minimum sleep() interval (milliseconds) when " \ 3090 "ConvertSleepToYield is off (used for Solaris)") \ 3091 \ 3092 develop(intx, ProfilerPCTickThreshold, 15, \ 3093 "Number of ticks in a PC buckets to be a hotspot") \ 3094 \ 3095 notproduct(intx, DeoptimizeALotInterval, 5, \ 3096 "Number of exits until DeoptimizeALot kicks in") \ 3097 \ 3098 notproduct(intx, ZombieALotInterval, 5, \ 3099 "Number of exits until ZombieALot kicks in") \ 3100 \ 3101 diagnostic(intx, MallocVerifyInterval, 0, \ 3102 "If non-zero, verify C heap after every N calls to " \ 3103 "malloc/realloc/free") \ 3104 \ 3105 diagnostic(intx, MallocVerifyStart, 0, \ 3106 "If non-zero, start verifying C heap after Nth call to " \ 3107 "malloc/realloc/free") \ 3108 \ 3109 diagnostic(uintx, MallocMaxTestWords, 0, \ 3110 "If non-zero, maximum number of words that malloc/realloc can " \ 3111 "allocate (for testing only)") \ 3112 \ 3113 product(intx, TypeProfileWidth, 2, \ 3114 "Number of receiver types to record in call/cast profile") \ 3115 \ 3116 develop(intx, BciProfileWidth, 2, \ 3117 "Number of return bci's to record in ret profile") \ 3118 \ 3119 product(intx, PerMethodRecompilationCutoff, 400, \ 3120 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3121 \ 3122 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3123 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3124 \ 3125 product(intx, PerMethodTrapLimit, 100, \ 3126 "Limit on traps (of one kind) in a method (includes inlines)") \ 3127 \ 3128 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3129 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3130 \ 3131 product(intx, PerBytecodeTrapLimit, 4, \ 3132 "Limit on traps (of one kind) at a particular BCI") \ 3133 \ 3134 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3135 "Extra method data trap entries for speculation") \ 3136 \ 3137 develop(intx, InlineFrequencyRatio, 20, \ 3138 "Ratio of call site execution to caller method invocation") \ 3139 \ 3140 develop_pd(intx, InlineFrequencyCount, \ 3141 "Count of call site execution necessary to trigger frequent " \ 3142 "inlining") \ 3143 \ 3144 develop(intx, InlineThrowCount, 50, \ 3145 "Force inlining of interpreted methods that throw this often") \ 3146 \ 3147 develop(intx, InlineThrowMaxSize, 200, \ 3148 "Force inlining of throwing methods smaller than this") \ 3149 \ 3150 develop(intx, ProfilerNodeSize, 1024, \ 3151 "Size in K to allocate for the Profile Nodes of each thread") \ 3152 \ 3153 product_pd(intx, PreInflateSpin, \ 3154 "Number of times to spin wait before inflation") \ 3155 \ 3156 /* gc parameters */ \ 3157 product(uintx, InitialHeapSize, 0, \ 3158 "Initial heap size (in bytes); zero means use ergonomics") \ 3159 \ 3160 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3161 "Maximum heap size (in bytes)") \ 3162 \ 3163 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3164 "Initial tenured generation size (in bytes)") \ 3165 \ 3166 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3167 "Initial new generation size (in bytes)") \ 3168 \ 3169 product(uintx, MaxNewSize, max_uintx, \ 3170 "Maximum new generation size (in bytes), max_uintx means set " \ 3171 "ergonomically") \ 3172 \ 3173 product(uintx, PretenureSizeThreshold, 0, \ 3174 "Maximum size in bytes of objects allocated in DefNew " \ 3175 "generation; zero means no maximum") \ 3176 \ 3177 product(uintx, TLABSize, 0, \ 3178 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3179 \ 3180 product(uintx, MinTLABSize, 2*K, \ 3181 "Minimum allowed TLAB size (in bytes)") \ 3182 \ 3183 product(uintx, TLABAllocationWeight, 35, \ 3184 "Allocation averaging weight") \ 3185 \ 3186 product(uintx, TLABWasteTargetPercent, 1, \ 3187 "Percentage of Eden that can be wasted") \ 3188 \ 3189 product(uintx, TLABRefillWasteFraction, 64, \ 3190 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3191 \ 3192 product(uintx, TLABWasteIncrement, 4, \ 3193 "Increment allowed waste at slow allocation") \ 3194 \ 3195 product(uintx, SurvivorRatio, 8, \ 3196 "Ratio of eden/survivor space size") \ 3197 \ 3198 product(uintx, NewRatio, 2, \ 3199 "Ratio of old/new generation sizes") \ 3200 \ 3201 product_pd(uintx, NewSizeThreadIncrease, \ 3202 "Additional size added to desired new generation size per " \ 3203 "non-daemon thread (in bytes)") \ 3204 \ 3205 product_pd(uintx, MetaspaceSize, \ 3206 "Initial size of Metaspaces (in bytes)") \ 3207 \ 3208 product(uintx, MaxMetaspaceSize, max_uintx, \ 3209 "Maximum size of Metaspaces (in bytes)") \ 3210 \ 3211 product(uintx, CompressedClassSpaceSize, 1*G, \ 3212 "Maximum size of class area in Metaspace when compressed " \ 3213 "class pointers are used") \ 3214 \ 3215 manageable(uintx, MinHeapFreeRatio, 40, \ 3216 "The minimum percentage of heap free after GC to avoid expansion."\ 3217 " For most GCs this applies to the old generation. In G1 and" \ 3218 " ParallelGC it applies to the whole heap.") \ 3219 \ 3220 manageable(uintx, MaxHeapFreeRatio, 70, \ 3221 "The maximum percentage of heap free after GC to avoid shrinking."\ 3222 " For most GCs this applies to the old generation. In G1 and" \ 3223 " ParallelGC it applies to the whole heap.") \ 3224 \ 3225 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3226 "Number of milliseconds per MB of free space in the heap") \ 3227 \ 3228 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3229 "The minimum change in heap space due to GC (in bytes)") \ 3230 \ 3231 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3232 "The minimum expansion of Metaspace (in bytes)") \ 3233 \ 3234 product(uintx, MinMetaspaceFreeRatio, 40, \ 3235 "The minimum percentage of Metaspace free after GC to avoid " \ 3236 "expansion") \ 3237 \ 3238 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3239 "The maximum percentage of Metaspace free after GC to avoid " \ 3240 "shrinking") \ 3241 \ 3242 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3243 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3244 \ 3245 product(uintx, QueuedAllocationWarningCount, 0, \ 3246 "Number of times an allocation that queues behind a GC " \ 3247 "will retry before printing a warning") \ 3248 \ 3249 diagnostic(uintx, VerifyGCStartAt, 0, \ 3250 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3251 \ 3252 diagnostic(intx, VerifyGCLevel, 0, \ 3253 "Generation level at which to start +VerifyBefore/AfterGC") \ 3254 \ 3255 product(uintx, MaxTenuringThreshold, 15, \ 3256 "Maximum value for tenuring threshold") \ 3257 \ 3258 product(uintx, InitialTenuringThreshold, 7, \ 3259 "Initial value for tenuring threshold") \ 3260 \ 3261 product(uintx, TargetSurvivorRatio, 50, \ 3262 "Desired percentage of survivor space used after scavenge") \ 3263 \ 3264 product(uintx, MarkSweepDeadRatio, 5, \ 3265 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3266 "Serial mark sweep treats this as both the minimum and maximum " \ 3267 "value. " \ 3268 "CMS uses this value only if it falls back to mark sweep. " \ 3269 "Par compact uses a variable scale based on the density of the " \ 3270 "generation and treats this as the maximum value when the heap " \ 3271 "is either completely full or completely empty. Par compact " \ 3272 "also has a smaller default value; see arguments.cpp.") \ 3273 \ 3274 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3275 "How often should we fully compact the heap (ignoring the dead " \ 3276 "space parameters)") \ 3277 \ 3278 product(intx, PrintCMSStatistics, 0, \ 3279 "Statistics for CMS") \ 3280 \ 3281 product(bool, PrintCMSInitiationStatistics, false, \ 3282 "Statistics for initiating a CMS collection") \ 3283 \ 3284 product(intx, PrintFLSStatistics, 0, \ 3285 "Statistics for CMS' FreeListSpace") \ 3286 \ 3287 product(intx, PrintFLSCensus, 0, \ 3288 "Census for CMS' FreeListSpace") \ 3289 \ 3290 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3291 "Delay between expansion and allocation (in milliseconds)") \ 3292 \ 3293 develop(uintx, GCWorkerDelayMillis, 0, \ 3294 "Delay in scheduling GC workers (in milliseconds)") \ 3295 \ 3296 product(intx, DeferThrSuspendLoopCount, 4000, \ 3297 "(Unstable) Number of times to iterate in safepoint loop " \ 3298 "before blocking VM threads ") \ 3299 \ 3300 product(intx, DeferPollingPageLoopCount, -1, \ 3301 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3302 "before changing safepoint polling page to RO ") \ 3303 \ 3304 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3305 \ 3306 product(bool, PSChunkLargeArrays, true, \ 3307 "Process large arrays in chunks") \ 3308 \ 3309 product(uintx, GCDrainStackTargetSize, 64, \ 3310 "Number of entries we will try to leave on the stack " \ 3311 "during parallel gc") \ 3312 \ 3313 /* stack parameters */ \ 3314 product_pd(intx, StackYellowPages, \ 3315 "Number of yellow zone (recoverable overflows) pages") \ 3316 \ 3317 product_pd(intx, StackRedPages, \ 3318 "Number of red zone (unrecoverable overflows) pages") \ 3319 \ 3320 product_pd(intx, StackShadowPages, \ 3321 "Number of shadow zone (for overflow checking) pages " \ 3322 "this should exceed the depth of the VM and native call stack") \ 3323 \ 3324 product_pd(intx, ThreadStackSize, \ 3325 "Thread Stack Size (in Kbytes)") \ 3326 \ 3327 product_pd(intx, VMThreadStackSize, \ 3328 "Non-Java Thread Stack Size (in Kbytes)") \ 3329 \ 3330 product_pd(intx, CompilerThreadStackSize, \ 3331 "Compiler Thread Stack Size (in Kbytes)") \ 3332 \ 3333 develop_pd(uintx, JVMInvokeMethodSlack, \ 3334 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3335 \ 3336 product(uintx, ThreadSafetyMargin, 50*M, \ 3337 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3338 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3339 "disable this feature") \ 3340 \ 3341 /* code cache parameters */ \ 3342 /* ppc64 has large code-entry alignment. */ \ 3343 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \ 3344 "Code cache segment size (in bytes) - smallest unit of " \ 3345 "allocation") \ 3346 \ 3347 develop_pd(intx, CodeEntryAlignment, \ 3348 "Code entry alignment for generated code (in bytes)") \ 3349 \ 3350 product_pd(intx, OptoLoopAlignment, \ 3351 "Align inner loops to zero relative to this modulus") \ 3352 \ 3353 product_pd(uintx, InitialCodeCacheSize, \ 3354 "Initial code cache size (in bytes)") \ 3355 \ 3356 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3357 "Minimum code cache size (in bytes) required to start VM.") \ 3358 \ 3359 product_pd(uintx, ReservedCodeCacheSize, \ 3360 "Reserved code cache size (in bytes) - maximum code cache size") \ 3361 \ 3362 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3363 "When less than X space left, we stop compiling") \ 3364 \ 3365 product_pd(uintx, CodeCacheExpansionSize, \ 3366 "Code cache expansion size (in bytes)") \ 3367 \ 3368 develop_pd(uintx, CodeCacheMinBlockLength, \ 3369 "Minimum number of segments in a code cache block") \ 3370 \ 3371 notproduct(bool, ExitOnFullCodeCache, false, \ 3372 "Exit the VM if we fill the code cache") \ 3373 \ 3374 product(bool, UseCodeCacheFlushing, true, \ 3375 "Remove cold/old nmethods from the code cache") \ 3376 \ 3377 /* interpreter debugging */ \ 3378 develop(intx, BinarySwitchThreshold, 5, \ 3379 "Minimal number of lookupswitch entries for rewriting to binary " \ 3380 "switch") \ 3381 \ 3382 develop(intx, StopInterpreterAt, 0, \ 3383 "Stop interpreter execution at specified bytecode number") \ 3384 \ 3385 develop(intx, TraceBytecodesAt, 0, \ 3386 "Trace bytecodes starting with specified bytecode number") \ 3387 \ 3388 /* compiler interface */ \ 3389 develop(intx, CIStart, 0, \ 3390 "The id of the first compilation to permit") \ 3391 \ 3392 develop(intx, CIStop, max_jint, \ 3393 "The id of the last compilation to permit") \ 3394 \ 3395 develop(intx, CIStartOSR, 0, \ 3396 "The id of the first osr compilation to permit " \ 3397 "(CICountOSR must be on)") \ 3398 \ 3399 develop(intx, CIStopOSR, max_jint, \ 3400 "The id of the last osr compilation to permit " \ 3401 "(CICountOSR must be on)") \ 3402 \ 3403 develop(intx, CIBreakAtOSR, -1, \ 3404 "The id of osr compilation to break at") \ 3405 \ 3406 develop(intx, CIBreakAt, -1, \ 3407 "The id of compilation to break at") \ 3408 \ 3409 product(ccstrlist, CompileOnly, "", \ 3410 "List of methods (pkg/class.name) to restrict compilation to") \ 3411 \ 3412 product(ccstr, CompileCommandFile, NULL, \ 3413 "Read compiler commands from this file [.hotspot_compiler]") \ 3414 \ 3415 product(ccstrlist, CompileCommand, "", \ 3416 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3417 \ 3418 develop(bool, ReplayCompiles, false, \ 3419 "Enable replay of compilations from ReplayDataFile") \ 3420 \ 3421 product(ccstr, ReplayDataFile, NULL, \ 3422 "File containing compilation replay information" \ 3423 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3424 \ 3425 product(ccstr, InlineDataFile, NULL, \ 3426 "File containing inlining replay information" \ 3427 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3428 \ 3429 develop(intx, ReplaySuppressInitializers, 2, \ 3430 "Control handling of class initialization during replay: " \ 3431 "0 - don't do anything special; " \ 3432 "1 - treat all class initializers as empty; " \ 3433 "2 - treat class initializers for application classes as empty; " \ 3434 "3 - allow all class initializers to run during bootstrap but " \ 3435 " pretend they are empty after starting replay") \ 3436 \ 3437 develop(bool, ReplayIgnoreInitErrors, false, \ 3438 "Ignore exceptions thrown during initialization for replay") \ 3439 \ 3440 product(bool, DumpReplayDataOnError, true, \ 3441 "Record replay data for crashing compiler threads") \ 3442 \ 3443 product(bool, CICompilerCountPerCPU, false, \ 3444 "1 compiler thread for log(N CPUs)") \ 3445 \ 3446 develop(intx, CIFireOOMAt, -1, \ 3447 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3448 "(non-negative value throws OOM after this many CI accesses " \ 3449 "in each compile)") \ 3450 notproduct(intx, CICrashAt, -1, \ 3451 "id of compilation to trigger assert in compiler thread for " \ 3452 "the purpose of testing, e.g. generation of replay data") \ 3453 notproduct(bool, CIObjectFactoryVerify, false, \ 3454 "enable potentially expensive verification in ciObjectFactory") \ 3455 \ 3456 /* Priorities */ \ 3457 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3458 \ 3459 product(intx, ThreadPriorityPolicy, 0, \ 3460 "0 : Normal. "\ 3461 " VM chooses priorities that are appropriate for normal "\ 3462 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3463 " to normal native priority. Java priorities below " \ 3464 " NORM_PRIORITY map to lower native priority values. On "\ 3465 " Windows applications are allowed to use higher native "\ 3466 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3467 " not use the highest possible native priority, "\ 3468 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3469 " system threads. On Linux thread priorities are ignored "\ 3470 " because the OS does not support static priority in "\ 3471 " SCHED_OTHER scheduling class which is the only choice for "\ 3472 " non-root, non-realtime applications. "\ 3473 "1 : Aggressive. "\ 3474 " Java thread priorities map over to the entire range of "\ 3475 " native thread priorities. Higher Java thread priorities map "\ 3476 " to higher native thread priorities. This policy should be "\ 3477 " used with care, as sometimes it can cause performance "\ 3478 " degradation in the application and/or the entire system. On "\ 3479 " Linux this policy requires root privilege.") \ 3480 \ 3481 product(bool, ThreadPriorityVerbose, false, \ 3482 "Print priority changes") \ 3483 \ 3484 product(intx, DefaultThreadPriority, -1, \ 3485 "The native priority at which threads run if not elsewhere " \ 3486 "specified (-1 means no change)") \ 3487 \ 3488 product(intx, CompilerThreadPriority, -1, \ 3489 "The native priority at which compiler threads should run " \ 3490 "(-1 means no change)") \ 3491 \ 3492 product(intx, VMThreadPriority, -1, \ 3493 "The native priority at which the VM thread should run " \ 3494 "(-1 means no change)") \ 3495 \ 3496 product(bool, CompilerThreadHintNoPreempt, true, \ 3497 "(Solaris only) Give compiler threads an extra quanta") \ 3498 \ 3499 product(bool, VMThreadHintNoPreempt, false, \ 3500 "(Solaris only) Give VM thread an extra quanta") \ 3501 \ 3502 product(intx, JavaPriority1_To_OSPriority, -1, \ 3503 "Map Java priorities to OS priorities") \ 3504 \ 3505 product(intx, JavaPriority2_To_OSPriority, -1, \ 3506 "Map Java priorities to OS priorities") \ 3507 \ 3508 product(intx, JavaPriority3_To_OSPriority, -1, \ 3509 "Map Java priorities to OS priorities") \ 3510 \ 3511 product(intx, JavaPriority4_To_OSPriority, -1, \ 3512 "Map Java priorities to OS priorities") \ 3513 \ 3514 product(intx, JavaPriority5_To_OSPriority, -1, \ 3515 "Map Java priorities to OS priorities") \ 3516 \ 3517 product(intx, JavaPriority6_To_OSPriority, -1, \ 3518 "Map Java priorities to OS priorities") \ 3519 \ 3520 product(intx, JavaPriority7_To_OSPriority, -1, \ 3521 "Map Java priorities to OS priorities") \ 3522 \ 3523 product(intx, JavaPriority8_To_OSPriority, -1, \ 3524 "Map Java priorities to OS priorities") \ 3525 \ 3526 product(intx, JavaPriority9_To_OSPriority, -1, \ 3527 "Map Java priorities to OS priorities") \ 3528 \ 3529 product(intx, JavaPriority10_To_OSPriority,-1, \ 3530 "Map Java priorities to OS priorities") \ 3531 \ 3532 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3533 "Java thread priority 10 maps to critical scheduling priority") \ 3534 \ 3535 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3536 "Compiler thread(s) run at critical scheduling priority") \ 3537 \ 3538 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3539 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3540 \ 3541 /* compiler debugging */ \ 3542 notproduct(intx, CompileTheWorldStartAt, 1, \ 3543 "First class to consider when using +CompileTheWorld") \ 3544 \ 3545 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3546 "Last class to consider when using +CompileTheWorld") \ 3547 \ 3548 develop(intx, NewCodeParameter, 0, \ 3549 "Testing Only: Create a dedicated integer parameter before " \ 3550 "putback") \ 3551 \ 3552 /* new oopmap storage allocation */ \ 3553 develop(intx, MinOopMapAllocation, 8, \ 3554 "Minimum number of OopMap entries in an OopMapSet") \ 3555 \ 3556 /* Background Compilation */ \ 3557 develop(intx, LongCompileThreshold, 50, \ 3558 "Used with +TraceLongCompiles") \ 3559 \ 3560 product(intx, StarvationMonitorInterval, 200, \ 3561 "Pause between each check (in milliseconds)") \ 3562 \ 3563 /* recompilation */ \ 3564 product_pd(intx, CompileThreshold, \ 3565 "number of interpreted method invocations before (re-)compiling") \ 3566 \ 3567 product_pd(intx, BackEdgeThreshold, \ 3568 "Interpreter Back edge threshold at which an OSR compilation is " \ 3569 "invoked") \ 3570 \ 3571 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3572 "Interpreter (tier 0) invocation notification frequency") \ 3573 \ 3574 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3575 "C1 without MDO (tier 2) invocation notification frequency") \ 3576 \ 3577 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3578 "C1 with MDO profiling (tier 3) invocation notification " \ 3579 "frequency") \ 3580 \ 3581 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3582 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3583 \ 3584 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3585 "Interpreter (tier 0) invocation notification frequency") \ 3586 \ 3587 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3588 "C1 without MDO (tier 2) invocation notification frequency") \ 3589 \ 3590 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3591 "C1 with MDO profiling (tier 3) invocation notification " \ 3592 "frequency") \ 3593 \ 3594 product(intx, Tier2CompileThreshold, 0, \ 3595 "threshold at which tier 2 compilation is invoked") \ 3596 \ 3597 product(intx, Tier2BackEdgeThreshold, 0, \ 3598 "Back edge threshold at which tier 2 compilation is invoked") \ 3599 \ 3600 product(intx, Tier3InvocationThreshold, 200, \ 3601 "Compile if number of method invocations crosses this " \ 3602 "threshold") \ 3603 \ 3604 product(intx, Tier3MinInvocationThreshold, 100, \ 3605 "Minimum invocation to compile at tier 3") \ 3606 \ 3607 product(intx, Tier3CompileThreshold, 2000, \ 3608 "Threshold at which tier 3 compilation is invoked (invocation " \ 3609 "minimum must be satisfied") \ 3610 \ 3611 product(intx, Tier3BackEdgeThreshold, 60000, \ 3612 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3613 \ 3614 product(intx, Tier4InvocationThreshold, 5000, \ 3615 "Compile if number of method invocations crosses this " \ 3616 "threshold") \ 3617 \ 3618 product(intx, Tier4MinInvocationThreshold, 600, \ 3619 "Minimum invocation to compile at tier 4") \ 3620 \ 3621 product(intx, Tier4CompileThreshold, 15000, \ 3622 "Threshold at which tier 4 compilation is invoked (invocation " \ 3623 "minimum must be satisfied") \ 3624 \ 3625 product(intx, Tier4BackEdgeThreshold, 40000, \ 3626 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3627 \ 3628 product(intx, Tier3DelayOn, 5, \ 3629 "If C2 queue size grows over this amount per compiler thread " \ 3630 "stop compiling at tier 3 and start compiling at tier 2") \ 3631 \ 3632 product(intx, Tier3DelayOff, 2, \ 3633 "If C2 queue size is less than this amount per compiler thread " \ 3634 "allow methods compiled at tier 2 transition to tier 3") \ 3635 \ 3636 product(intx, Tier3LoadFeedback, 5, \ 3637 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3638 "reaches this amount per compiler thread") \ 3639 \ 3640 product(intx, Tier4LoadFeedback, 3, \ 3641 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3642 "reaches this amount per compiler thread") \ 3643 \ 3644 product(intx, TieredCompileTaskTimeout, 50, \ 3645 "Kill compile task if method was not used within " \ 3646 "given timeout in milliseconds") \ 3647 \ 3648 product(intx, TieredStopAtLevel, 4, \ 3649 "Stop at given compilation level") \ 3650 \ 3651 product(intx, Tier0ProfilingStartPercentage, 200, \ 3652 "Start profiling in interpreter if the counters exceed tier 3 " \ 3653 "thresholds by the specified percentage") \ 3654 \ 3655 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3656 "Increase the compile threshold for C1 compilation if the code " \ 3657 "cache is filled by the specified percentage") \ 3658 \ 3659 product(intx, TieredRateUpdateMinTime, 1, \ 3660 "Minimum rate sampling interval (in milliseconds)") \ 3661 \ 3662 product(intx, TieredRateUpdateMaxTime, 25, \ 3663 "Maximum rate sampling interval (in milliseconds)") \ 3664 \ 3665 product_pd(bool, TieredCompilation, \ 3666 "Enable tiered compilation") \ 3667 \ 3668 product(bool, PrintTieredEvents, false, \ 3669 "Print tiered events notifications") \ 3670 \ 3671 product_pd(intx, OnStackReplacePercentage, \ 3672 "NON_TIERED number of method invocations/branches (expressed as " \ 3673 "% of CompileThreshold) before (re-)compiling OSR code") \ 3674 \ 3675 product(intx, InterpreterProfilePercentage, 33, \ 3676 "NON_TIERED number of method invocations/branches (expressed as " \ 3677 "% of CompileThreshold) before profiling in the interpreter") \ 3678 \ 3679 develop(intx, MaxRecompilationSearchLength, 10, \ 3680 "The maximum number of frames to inspect when searching for " \ 3681 "recompilee") \ 3682 \ 3683 develop(intx, MaxInterpretedSearchLength, 3, \ 3684 "The maximum number of interpreted frames to skip when searching "\ 3685 "for recompilee") \ 3686 \ 3687 develop(intx, DesiredMethodLimit, 8000, \ 3688 "The desired maximum method size (in bytecodes) after inlining") \ 3689 \ 3690 develop(intx, HugeMethodLimit, 8000, \ 3691 "Don't compile methods larger than this if " \ 3692 "+DontCompileHugeMethods") \ 3693 \ 3694 /* New JDK 1.4 reflection implementation */ \ 3695 \ 3696 develop(bool, UseNewReflection, true, \ 3697 "Temporary flag for transition to reflection based on dynamic " \ 3698 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3699 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3700 "changes were needed") \ 3701 \ 3702 develop(bool, VerifyReflectionBytecodes, false, \ 3703 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3704 "in situations like that described in 4486457 or for " \ 3705 "constructors generated for serialization, so can not be enabled "\ 3706 "in product.") \ 3707 \ 3708 product(bool, ReflectionWrapResolutionErrors, true, \ 3709 "Temporary flag for transition to AbstractMethodError wrapped " \ 3710 "in InvocationTargetException. See 6531596") \ 3711 \ 3712 develop(intx, FastSuperclassLimit, 8, \ 3713 "Depth of hardwired instanceof accelerator array") \ 3714 \ 3715 /* Properties for Java libraries */ \ 3716 \ 3717 product(uintx, MaxDirectMemorySize, 0, \ 3718 "Maximum total size of NIO direct-buffer allocations") \ 3719 \ 3720 /* temporary developer defined flags */ \ 3721 \ 3722 diagnostic(bool, UseNewCode, false, \ 3723 "Testing Only: Use the new version while testing") \ 3724 \ 3725 diagnostic(bool, UseNewCode2, false, \ 3726 "Testing Only: Use the new version while testing") \ 3727 \ 3728 diagnostic(bool, UseNewCode3, false, \ 3729 "Testing Only: Use the new version while testing") \ 3730 \ 3731 /* flags for performance data collection */ \ 3732 \ 3733 product(bool, UsePerfData, falseInEmbedded, \ 3734 "Flag to disable jvmstat instrumentation for performance testing "\ 3735 "and problem isolation purposes") \ 3736 \ 3737 product(bool, PerfDataSaveToFile, false, \ 3738 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3739 \ 3740 product(ccstr, PerfDataSaveFile, NULL, \ 3741 "Save PerfData memory to the specified absolute pathname. " \ 3742 "The string %p in the file name (if present) " \ 3743 "will be replaced by pid") \ 3744 \ 3745 product(intx, PerfDataSamplingInterval, 50, \ 3746 "Data sampling interval (in milliseconds)") \ 3747 \ 3748 develop(bool, PerfTraceDataCreation, false, \ 3749 "Trace creation of Performance Data Entries") \ 3750 \ 3751 develop(bool, PerfTraceMemOps, false, \ 3752 "Trace PerfMemory create/attach/detach calls") \ 3753 \ 3754 product(bool, PerfDisableSharedMem, false, \ 3755 "Store performance data in standard memory") \ 3756 \ 3757 product(intx, PerfDataMemorySize, 32*K, \ 3758 "Size of performance data memory region. Will be rounded " \ 3759 "up to a multiple of the native os page size.") \ 3760 \ 3761 product(intx, PerfMaxStringConstLength, 1024, \ 3762 "Maximum PerfStringConstant string length before truncation") \ 3763 \ 3764 product(bool, PerfAllowAtExitRegistration, false, \ 3765 "Allow registration of atexit() methods") \ 3766 \ 3767 product(bool, PerfBypassFileSystemCheck, false, \ 3768 "Bypass Win32 file system criteria checks (Windows Only)") \ 3769 \ 3770 product(intx, UnguardOnExecutionViolation, 0, \ 3771 "Unguard page and retry on no-execute fault (Win32 only) " \ 3772 "0=off, 1=conservative, 2=aggressive") \ 3773 \ 3774 /* Serviceability Support */ \ 3775 \ 3776 product(bool, ManagementServer, false, \ 3777 "Create JMX Management Server") \ 3778 \ 3779 product(bool, DisableAttachMechanism, false, \ 3780 "Disable mechanism that allows tools to attach to this VM") \ 3781 \ 3782 product(bool, StartAttachListener, false, \ 3783 "Always start Attach Listener at VM startup") \ 3784 \ 3785 manageable(bool, PrintConcurrentLocks, false, \ 3786 "Print java.util.concurrent locks in thread dump") \ 3787 \ 3788 product(bool, TransmitErrorReport, false, \ 3789 "Enable error report transmission on erroneous termination") \ 3790 \ 3791 product(ccstr, ErrorReportServer, NULL, \ 3792 "Override built-in error report server address") \ 3793 \ 3794 /* Shared spaces */ \ 3795 \ 3796 product(bool, UseSharedSpaces, true, \ 3797 "Use shared spaces for metadata") \ 3798 \ 3799 product(bool, VerifySharedSpaces, false, \ 3800 "Verify shared spaces (false for default archive, true for " \ 3801 "archive specified by -XX:SharedArchiveFile)") \ 3802 \ 3803 product(bool, RequireSharedSpaces, false, \ 3804 "Require shared spaces for metadata") \ 3805 \ 3806 product(bool, DumpSharedSpaces, false, \ 3807 "Special mode: JVM reads a class list, loads classes, builds " \ 3808 "shared spaces, and dumps the shared spaces to a file to be " \ 3809 "used in future JVM runs") \ 3810 \ 3811 product(bool, PrintSharedSpaces, false, \ 3812 "Print usage of shared spaces") \ 3813 \ 3814 product(bool, PrintSharedArchiveAndExit, false, \ 3815 "Print shared archive file contents") \ 3816 \ 3817 product(bool, PrintSharedDictionary, false, \ 3818 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3819 "dictionary") \ 3820 \ 3821 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3822 "Size of read-write space for metadata (in bytes)") \ 3823 \ 3824 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3825 "Size of read-only space for metadata (in bytes)") \ 3826 \ 3827 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3828 "Size of the shared miscellaneous data area (in bytes)") \ 3829 \ 3830 product(uintx, SharedMiscCodeSize, 120*K, \ 3831 "Size of the shared miscellaneous code area (in bytes)") \ 3832 \ 3833 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3834 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3835 "Address to allocate shared memory region for class data") \ 3836 \ 3837 diagnostic(bool, EnableInvokeDynamic, true, \ 3838 "support JSR 292 (method handles, invokedynamic, " \ 3839 "anonymous classes") \ 3840 \ 3841 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3842 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3843 "classes. Just exclude them from the shared dictionary.") \ 3844 \ 3845 diagnostic(bool, PrintMethodHandleStubs, false, \ 3846 "Print generated stub code for method handles") \ 3847 \ 3848 develop(bool, TraceMethodHandles, false, \ 3849 "trace internal method handle operations") \ 3850 \ 3851 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3852 "perform extra checks when constructing method handles") \ 3853 \ 3854 diagnostic(bool, ShowHiddenFrames, false, \ 3855 "show method handle implementation frames (usually hidden)") \ 3856 \ 3857 experimental(bool, TrustFinalNonStaticFields, false, \ 3858 "trust final non-static declarations for constant folding") \ 3859 \ 3860 diagnostic(bool, FoldStableValues, true, \ 3861 "Optimize loads from stable fields (marked w/ @Stable)") \ 3862 \ 3863 develop(bool, TraceInvokeDynamic, false, \ 3864 "trace internal invoke dynamic operations") \ 3865 \ 3866 diagnostic(bool, PauseAtStartup, false, \ 3867 "Causes the VM to pause at startup time and wait for the pause " \ 3868 "file to be removed (default: ./vm.paused.<pid>)") \ 3869 \ 3870 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3871 "The file to create and for whose removal to await when pausing " \ 3872 "at startup. (default: ./vm.paused.<pid>)") \ 3873 \ 3874 diagnostic(bool, PauseAtExit, false, \ 3875 "Pause and wait for keypress on exit if a debugger is attached") \ 3876 \ 3877 product(bool, ExtendedDTraceProbes, false, \ 3878 "Enable performance-impacting dtrace probes") \ 3879 \ 3880 product(bool, DTraceMethodProbes, false, \ 3881 "Enable dtrace probes for method-entry and method-exit") \ 3882 \ 3883 product(bool, DTraceAllocProbes, false, \ 3884 "Enable dtrace probes for object allocation") \ 3885 \ 3886 product(bool, DTraceMonitorProbes, false, \ 3887 "Enable dtrace probes for monitor events") \ 3888 \ 3889 product(bool, RelaxAccessControlCheck, false, \ 3890 "Relax the access control checks in the verifier") \ 3891 \ 3892 diagnostic(bool, PrintDTraceDOF, false, \ 3893 "Print the DTrace DOF passed to the system for JSDT probes") \ 3894 \ 3895 product(uintx, StringTableSize, defaultStringTableSize, \ 3896 "Number of buckets in the interned String table") \ 3897 \ 3898 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3899 "Number of buckets in the JVM internal Symbol table") \ 3900 \ 3901 product(bool, UseStringDeduplication, false, \ 3902 "Use string deduplication") \ 3903 \ 3904 product(bool, PrintStringDeduplicationStatistics, false, \ 3905 "Print string deduplication statistics") \ 3906 \ 3907 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3908 "A string must reach this age (or be promoted to an old region) " \ 3909 "to be considered for deduplication") \ 3910 \ 3911 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3912 "Force table resize every time the table is scanned") \ 3913 \ 3914 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3915 "Force table rehash every time the table is scanned") \ 3916 \ 3917 develop(bool, TraceDefaultMethods, false, \ 3918 "Trace the default method processing steps") \ 3919 \ 3920 develop(bool, VerifyGenericSignatures, false, \ 3921 "Abort VM on erroneous or inconsistent generic signatures") \ 3922 \ 3923 product(bool, UseVMInterruptibleIO, false, \ 3924 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3925 "EINTR for I/O operations results in OS_INTRPT. The default " \ 3926 "value of this flag is true for JDK 6 and earlier") \ 3927 \ 3928 diagnostic(bool, WhiteBoxAPI, false, \ 3929 "Enable internal testing APIs") \ 3930 \ 3931 product(bool, PrintGCCause, true, \ 3932 "Include GC cause in GC logging") \ 3933 \ 3934 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3935 "Default survivor space alignment in bytes") \ 3936 \ 3937 product(bool , AllowNonVirtualCalls, false, \ 3938 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3939 \ 3940 product(ccstr, DumpLoadedClassList, NULL, \ 3941 "Dump the names all loaded classes, that could be stored into " \ 3942 "the CDS archive, in the specified file") \ 3943 \ 3944 product(ccstr, SharedClassListFile, NULL, \ 3945 "Override the default CDS class list") \ 3946 \ 3947 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3948 "Override the default location of the CDS archive file") \ 3949 \ 3950 product(ccstr, ExtraSharedClassListFile, NULL, \ 3951 "Extra classlist for building the CDS archive file") \ 3952 \ 3953 experimental(uintx, ArrayAllocatorMallocLimit, \ 3954 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3955 "Allocation less than this value will be allocated " \ 3956 "using malloc. Larger allocations will use mmap.") \ 3957 \ 3958 product(bool, EnableTracing, false, \ 3959 "Enable event-based tracing") \ 3960 \ 3961 product(bool, UseLockedTracing, false, \ 3962 "Use locked-tracing when doing event-based tracing") \ 3963 \ 3964 product_pd(bool, PreserveFramePointer, \ 3965 "Use the FP register for holding the frame pointer " \ 3966 "and not as a general purpose register.") 3967 3968 /* 3969 * Macros for factoring of globals 3970 */ 3971 3972 // Interface macros 3973 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3974 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3975 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3976 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3977 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3978 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3979 #ifdef PRODUCT 3980 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3981 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3982 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3983 #else 3984 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3985 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3986 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3987 #endif 3988 // Special LP64 flags, product only needed for now. 3989 #ifdef _LP64 3990 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3991 #else 3992 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3993 #endif // _LP64 3994 3995 // Implementation macros 3996 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3997 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3998 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3999 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4000 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4001 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4002 #ifdef PRODUCT 4003 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4004 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4005 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4006 #else 4007 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4008 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4009 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4010 #endif 4011 #ifdef _LP64 4012 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4013 #else 4014 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4015 #endif // _LP64 4016 4017 RUNTIME_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) 4018 4019 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4020 4021 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4022 4023 // Extensions 4024 4025 #include "runtime/globals_ext.hpp" 4026 4027 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP