1 /* 2 * Copyright (c) 1997, 2014, 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 /* tracing */ \ 1283 \ 1284 notproduct(bool, TraceRuntimeCalls, false, \ 1285 "Trace run-time calls") \ 1286 \ 1287 develop(bool, TraceJNICalls, false, \ 1288 "Trace JNI calls") \ 1289 \ 1290 develop(bool, StressRewriter, false, \ 1291 "Stress linktime bytecode rewriting") \ 1292 \ 1293 notproduct(bool, TraceJVMCalls, false, \ 1294 "Trace JVM calls") \ 1295 \ 1296 product(ccstr, TraceJVMTI, NULL, \ 1297 "Trace flags for JVMTI functions and events") \ 1298 \ 1299 /* This option can change an EMCP method into an obsolete method. */ \ 1300 /* This can affect tests that except specific methods to be EMCP. */ \ 1301 /* This option should be used with caution. */ \ 1302 product(bool, StressLdcRewrite, false, \ 1303 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1304 \ 1305 product(intx, TraceRedefineClasses, 0, \ 1306 "Trace level for JVMTI RedefineClasses") \ 1307 \ 1308 develop(bool, StressMethodComparator, false, \ 1309 "Run the MethodComparator on all loaded methods") \ 1310 \ 1311 /* change to false by default sometime after Mustang */ \ 1312 product(bool, VerifyMergedCPBytecodes, true, \ 1313 "Verify bytecodes after RedefineClasses constant pool merging") \ 1314 \ 1315 develop(bool, TraceJNIHandleAllocation, false, \ 1316 "Trace allocation/deallocation of JNI handle blocks") \ 1317 \ 1318 develop(bool, TraceThreadEvents, false, \ 1319 "Trace all thread events") \ 1320 \ 1321 develop(bool, TraceBytecodes, false, \ 1322 "Trace bytecode execution") \ 1323 \ 1324 develop(bool, TraceClassInitialization, false, \ 1325 "Trace class initialization") \ 1326 \ 1327 develop(bool, TraceExceptions, false, \ 1328 "Trace exceptions") \ 1329 \ 1330 develop(bool, TraceICs, false, \ 1331 "Trace inline cache changes") \ 1332 \ 1333 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1334 "Trace method invocation counter overflow") \ 1335 \ 1336 develop(bool, TraceInlineCacheClearing, false, \ 1337 "Trace clearing of inline caches in nmethods") \ 1338 \ 1339 develop(bool, TraceDependencies, false, \ 1340 "Trace dependencies") \ 1341 \ 1342 develop(bool, VerifyDependencies, trueInDebug, \ 1343 "Exercise and verify the compilation dependency mechanism") \ 1344 \ 1345 develop(bool, TraceNewOopMapGeneration, false, \ 1346 "Trace OopMapGeneration") \ 1347 \ 1348 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1349 "Trace OopMapGeneration: print detailed cell states") \ 1350 \ 1351 develop(bool, TimeOopMap, false, \ 1352 "Time calls to GenerateOopMap::compute_map() in sum") \ 1353 \ 1354 develop(bool, TimeOopMap2, false, \ 1355 "Time calls to GenerateOopMap::compute_map() individually") \ 1356 \ 1357 develop(bool, TraceMonitorMismatch, false, \ 1358 "Trace monitor matching failures during OopMapGeneration") \ 1359 \ 1360 develop(bool, TraceOopMapRewrites, false, \ 1361 "Trace rewriting of method oops during oop map generation") \ 1362 \ 1363 develop(bool, TraceSafepoint, false, \ 1364 "Trace safepoint operations") \ 1365 \ 1366 develop(bool, TraceICBuffer, false, \ 1367 "Trace usage of IC buffer") \ 1368 \ 1369 develop(bool, TraceCompiledIC, false, \ 1370 "Trace changes of compiled IC") \ 1371 \ 1372 notproduct(bool, TraceZapDeadLocals, false, \ 1373 "Trace zapping dead locals") \ 1374 \ 1375 develop(bool, TraceStartupTime, false, \ 1376 "Trace setup time") \ 1377 \ 1378 develop(bool, TraceProtectionDomainVerification, false, \ 1379 "Trace protection domain verification") \ 1380 \ 1381 develop(bool, TraceClearedExceptions, false, \ 1382 "Print when an exception is forcibly cleared") \ 1383 \ 1384 product(bool, TraceClassResolution, false, \ 1385 "Trace all constant pool resolutions (for debugging)") \ 1386 \ 1387 product(bool, TraceBiasedLocking, false, \ 1388 "Trace biased locking in JVM") \ 1389 \ 1390 product(bool, TraceMonitorInflation, false, \ 1391 "Trace monitor inflation in JVM") \ 1392 \ 1393 /* gc */ \ 1394 \ 1395 product(bool, UseSerialGC, false, \ 1396 "Use the Serial garbage collector") \ 1397 \ 1398 product(bool, UseG1GC, false, \ 1399 "Use the Garbage-First garbage collector") \ 1400 \ 1401 product(bool, UseParallelGC, false, \ 1402 "Use the Parallel Scavenge garbage collector") \ 1403 \ 1404 product(bool, UseParallelOldGC, false, \ 1405 "Use the Parallel Old garbage collector") \ 1406 \ 1407 product(uintx, HeapMaximumCompactionInterval, 20, \ 1408 "How often should we maximally compact the heap (not allowing " \ 1409 "any dead space)") \ 1410 \ 1411 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1412 "The collection count for the first maximum compaction") \ 1413 \ 1414 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1415 "Use maximum compaction in the Parallel Old garbage collector " \ 1416 "for a system GC") \ 1417 \ 1418 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1419 "The mean used by the parallel compact dead wood " \ 1420 "limiter (a number between 0-100)") \ 1421 \ 1422 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1423 "The standard deviation used by the parallel compact dead wood " \ 1424 "limiter (a number between 0-100)") \ 1425 \ 1426 product(uintx, ParallelGCThreads, 0, \ 1427 "Number of parallel threads parallel gc will use") \ 1428 \ 1429 product(bool, UseDynamicNumberOfGCThreads, false, \ 1430 "Dynamically choose the number of parallel threads " \ 1431 "parallel gc will use") \ 1432 \ 1433 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1434 "Force dynamic selection of the number of " \ 1435 "parallel threads parallel gc will use to aid debugging") \ 1436 \ 1437 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1438 "Size of heap (bytes) per GC thread used in calculating the " \ 1439 "number of GC threads") \ 1440 \ 1441 product(bool, TraceDynamicGCThreads, false, \ 1442 "Trace the dynamic GC thread usage") \ 1443 \ 1444 develop(bool, ParallelOldGCSplitALot, false, \ 1445 "Provoke splitting (copying data from a young gen space to " \ 1446 "multiple destination spaces)") \ 1447 \ 1448 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1449 "How often to provoke splitting a young gen space") \ 1450 \ 1451 product(uintx, ConcGCThreads, 0, \ 1452 "Number of threads concurrent gc will use") \ 1453 \ 1454 product(uintx, YoungPLABSize, 4096, \ 1455 "Size of young gen promotion LAB's (in HeapWords)") \ 1456 \ 1457 product(uintx, OldPLABSize, 1024, \ 1458 "Size of old gen promotion LAB's (in HeapWords)") \ 1459 \ 1460 product(uintx, GCTaskTimeStampEntries, 200, \ 1461 "Number of time stamp entries per gc worker thread") \ 1462 \ 1463 product(bool, AlwaysTenure, false, \ 1464 "Always tenure objects in eden (ParallelGC only)") \ 1465 \ 1466 product(bool, NeverTenure, false, \ 1467 "Never tenure objects in eden, may tenure on overflow " \ 1468 "(ParallelGC only)") \ 1469 \ 1470 product(bool, ScavengeBeforeFullGC, true, \ 1471 "Scavenge youngest generation before each full GC, " \ 1472 "used with UseParallelGC") \ 1473 \ 1474 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1475 "Allow scavenges to occur when to-space contains objects") \ 1476 \ 1477 product(bool, UseConcMarkSweepGC, false, \ 1478 "Use Concurrent Mark-Sweep GC in the old generation") \ 1479 \ 1480 product(bool, ExplicitGCInvokesConcurrent, false, \ 1481 "A System.gc() request invokes a concurrent collection; " \ 1482 "(effective only when UseConcMarkSweepGC)") \ 1483 \ 1484 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1485 "A System.gc() request invokes a concurrent collection and " \ 1486 "also unloads classes during such a concurrent gc cycle " \ 1487 "(effective only when UseConcMarkSweepGC)") \ 1488 \ 1489 product(bool, GCLockerInvokesConcurrent, false, \ 1490 "The exit of a JNI critical section necessitating a scavenge, " \ 1491 "also kicks off a background concurrent collection") \ 1492 \ 1493 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1494 "How much the GC can expand the eden by while the GC locker " \ 1495 "is active (as a percentage)") \ 1496 \ 1497 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1498 "Number of times to retry allocations when " \ 1499 "blocked by the GC locker") \ 1500 \ 1501 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1502 "Use adaptive free lists in the CMS generation") \ 1503 \ 1504 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1505 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1506 \ 1507 develop(bool, RotateCMSCollectionTypes, false, \ 1508 "Rotate the CMS collections among concurrent and STW") \ 1509 \ 1510 product(bool, UseCMSBestFit, true, \ 1511 "Use CMS best fit allocation strategy") \ 1512 \ 1513 product(bool, UseCMSCollectionPassing, true, \ 1514 "Use passing of collection from background to foreground") \ 1515 \ 1516 product(bool, UseParNewGC, false, \ 1517 "Use parallel threads in the new generation") \ 1518 \ 1519 product(bool, ParallelGCVerbose, false, \ 1520 "Verbose output for parallel gc") \ 1521 \ 1522 product(uintx, ParallelGCBufferWastePct, 10, \ 1523 "Wasted fraction of parallel allocation buffer") \ 1524 \ 1525 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1526 "Retain parallel allocation buffers across scavenges; " \ 1527 "it is disabled because this currently conflicts with " \ 1528 "parallel card scanning under certain conditions.") \ 1529 \ 1530 product(uintx, TargetPLABWastePct, 10, \ 1531 "Target wasted space in last buffer as percent of overall " \ 1532 "allocation") \ 1533 \ 1534 product(uintx, PLABWeight, 75, \ 1535 "Percentage (0-100) used to weigh the current sample when " \ 1536 "computing exponentially decaying average for ResizePLAB") \ 1537 \ 1538 product(bool, ResizePLAB, true, \ 1539 "Dynamically resize (survivor space) promotion LAB's") \ 1540 \ 1541 product(bool, PrintPLAB, false, \ 1542 "Print (survivor space) promotion LAB's sizing decisions") \ 1543 \ 1544 product(intx, ParGCArrayScanChunk, 50, \ 1545 "Scan a subset of object array and push remainder, if array is " \ 1546 "bigger than this") \ 1547 \ 1548 product(bool, ParGCUseLocalOverflow, false, \ 1549 "Instead of a global overflow list, use local overflow stacks") \ 1550 \ 1551 product(bool, ParGCTrimOverflow, true, \ 1552 "Eagerly trim the local overflow lists " \ 1553 "(when ParGCUseLocalOverflow)") \ 1554 \ 1555 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1556 "Simulate work queue overflow in ParNew") \ 1557 \ 1558 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1559 "An `interval' counter that determines how frequently " \ 1560 "we simulate overflow; a smaller number increases frequency") \ 1561 \ 1562 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1563 "The desired number of objects to claim from the overflow list") \ 1564 \ 1565 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1566 "The number of strides per worker thread that we divide up the " \ 1567 "card table scanning work into") \ 1568 \ 1569 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1570 "The number of cards in each chunk of the parallel chunks used " \ 1571 "during card table scanning") \ 1572 \ 1573 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1574 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1575 "for parallel GC") \ 1576 \ 1577 product(uintx, OldPLABWeight, 50, \ 1578 "Percentage (0-100) used to weight the current sample when " \ 1579 "computing exponentially decaying average for resizing " \ 1580 "CMSParPromoteBlocksToClaim") \ 1581 \ 1582 product(bool, ResizeOldPLAB, true, \ 1583 "Dynamically resize (old gen) promotion LAB's") \ 1584 \ 1585 product(bool, PrintOldPLAB, false, \ 1586 "Print (old gen) promotion LAB's sizing decisions") \ 1587 \ 1588 product(uintx, CMSOldPLABMin, 16, \ 1589 "Minimum size of CMS gen promotion LAB caches per worker " \ 1590 "per block size") \ 1591 \ 1592 product(uintx, CMSOldPLABMax, 1024, \ 1593 "Maximum size of CMS gen promotion LAB caches per worker " \ 1594 "per block size") \ 1595 \ 1596 product(uintx, CMSOldPLABNumRefills, 4, \ 1597 "Nominal number of refills of CMS gen promotion LAB cache " \ 1598 "per worker per block size") \ 1599 \ 1600 product(bool, CMSOldPLABResizeQuicker, false, \ 1601 "React on-the-fly during a scavenge to a sudden " \ 1602 "change in block demand rate") \ 1603 \ 1604 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1605 "The tolerance of the phase-change detector for on-the-fly " \ 1606 "PLAB resizing during a scavenge") \ 1607 \ 1608 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1609 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1610 "during a scavenge") \ 1611 \ 1612 product(bool, AlwaysPreTouch, false, \ 1613 "Force all freshly committed pages to be pre-touched") \ 1614 \ 1615 product_pd(uintx, CMSYoungGenPerWorker, \ 1616 "The maximum size of young gen chosen by default per GC worker " \ 1617 "thread available") \ 1618 \ 1619 product(bool, CMSIncrementalMode, false, \ 1620 "Whether CMS GC should operate in \"incremental\" mode") \ 1621 \ 1622 product(uintx, CMSIncrementalDutyCycle, 10, \ 1623 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1624 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1625 "value.") \ 1626 \ 1627 product(bool, CMSIncrementalPacing, true, \ 1628 "Whether the CMS incremental mode duty cycle should be " \ 1629 "automatically adjusted") \ 1630 \ 1631 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1632 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1633 "used when CMSIncrementalPacing is enabled") \ 1634 \ 1635 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1636 "Percentage (0-100) used to add conservatism when computing the " \ 1637 "duty cycle") \ 1638 \ 1639 product(uintx, CMSIncrementalOffset, 0, \ 1640 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1641 "is shifted to the right within the period between young GCs") \ 1642 \ 1643 product(uintx, CMSExpAvgFactor, 50, \ 1644 "Percentage (0-100) used to weigh the current sample when " \ 1645 "computing exponential averages for CMS statistics") \ 1646 \ 1647 product(uintx, CMS_FLSWeight, 75, \ 1648 "Percentage (0-100) used to weigh the current sample when " \ 1649 "computing exponentially decaying averages for CMS FLS " \ 1650 "statistics") \ 1651 \ 1652 product(uintx, CMS_FLSPadding, 1, \ 1653 "The multiple of deviation from mean to use for buffering " \ 1654 "against volatility in free list demand") \ 1655 \ 1656 product(uintx, FLSCoalescePolicy, 2, \ 1657 "CMS: aggressiveness level for coalescing, increasing " \ 1658 "from 0 to 4") \ 1659 \ 1660 product(bool, FLSAlwaysCoalesceLarge, false, \ 1661 "CMS: larger free blocks are always available for coalescing") \ 1662 \ 1663 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1664 "CMS: the smaller the percentage the greater the coalescing " \ 1665 "force") \ 1666 \ 1667 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1668 "CMS: the factor by which to inflate estimated demand of small " \ 1669 "block sizes to prevent coalescing with an adjoining block") \ 1670 \ 1671 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1672 "CMS: the factor by which to inflate estimated demand of large " \ 1673 "block sizes to prevent coalescing with an adjoining block") \ 1674 \ 1675 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1676 "CMS: the factor by which to inflate estimated demand of small " \ 1677 "block sizes to prevent splitting to supply demand for smaller " \ 1678 "blocks") \ 1679 \ 1680 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1681 "CMS: the factor by which to inflate estimated demand of large " \ 1682 "block sizes to prevent splitting to supply demand for smaller " \ 1683 "blocks") \ 1684 \ 1685 product(bool, CMSExtrapolateSweep, false, \ 1686 "CMS: cushion for block demand during sweep") \ 1687 \ 1688 product(uintx, CMS_SweepWeight, 75, \ 1689 "Percentage (0-100) used to weight the current sample when " \ 1690 "computing exponentially decaying average for inter-sweep " \ 1691 "duration") \ 1692 \ 1693 product(uintx, CMS_SweepPadding, 1, \ 1694 "The multiple of deviation from mean to use for buffering " \ 1695 "against volatility in inter-sweep duration") \ 1696 \ 1697 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1698 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1699 "duration exceeds this threshold in milliseconds") \ 1700 \ 1701 develop(bool, CMSTraceIncrementalMode, false, \ 1702 "Trace CMS incremental mode") \ 1703 \ 1704 develop(bool, CMSTraceIncrementalPacing, false, \ 1705 "Trace CMS incremental mode pacing computation") \ 1706 \ 1707 develop(bool, CMSTraceThreadState, false, \ 1708 "Trace the CMS thread state (enable the trace_state() method)") \ 1709 \ 1710 product(bool, CMSClassUnloadingEnabled, true, \ 1711 "Whether class unloading enabled when using CMS GC") \ 1712 \ 1713 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1714 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1715 "count for which classes may not be unloaded") \ 1716 \ 1717 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1718 "Compact when asked to collect CMS gen with " \ 1719 "clear_all_soft_refs()") \ 1720 \ 1721 product(bool, UseCMSCompactAtFullCollection, true, \ 1722 "Use Mark-Sweep-Compact algorithm at full collections") \ 1723 \ 1724 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1725 "Number of CMS full collection done before compaction if > 0") \ 1726 \ 1727 develop(intx, CMSDictionaryChoice, 0, \ 1728 "Use BinaryTreeDictionary as default in the CMS generation") \ 1729 \ 1730 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1731 "Replenish an indexed free list with this number of chunks") \ 1732 \ 1733 product(bool, CMSReplenishIntermediate, true, \ 1734 "Replenish all intermediate free-list caches") \ 1735 \ 1736 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1737 "When satisfying batched demand, split blocks from the " \ 1738 "IndexedFreeList whose size is a multiple of requested size") \ 1739 \ 1740 product(bool, CMSLoopWarn, false, \ 1741 "Warn in case of excessive CMS looping") \ 1742 \ 1743 develop(bool, CMSOverflowEarlyRestoration, false, \ 1744 "Restore preserved marks early") \ 1745 \ 1746 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1747 "Size of marking stack") \ 1748 \ 1749 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1750 "Maximum size of marking stack") \ 1751 \ 1752 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1753 "Simulate frequent marking stack / work queue overflow") \ 1754 \ 1755 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1756 "An \"interval\" counter that determines how frequently " \ 1757 "to simulate overflow; a smaller number increases frequency") \ 1758 \ 1759 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1760 "(Temporary, subject to experimentation) " \ 1761 "Maximum number of abortable preclean iterations, if > 0") \ 1762 \ 1763 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1764 "(Temporary, subject to experimentation) " \ 1765 "Maximum time in abortable preclean (in milliseconds)") \ 1766 \ 1767 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1768 "(Temporary, subject to experimentation) " \ 1769 "Nominal minimum work per abortable preclean iteration") \ 1770 \ 1771 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1772 "(Temporary, subject to experimentation) " \ 1773 "Time that we sleep between iterations when not given " \ 1774 "enough work per iteration") \ 1775 \ 1776 product(uintx, CMSRescanMultiple, 32, \ 1777 "Size (in cards) of CMS parallel rescan task") \ 1778 \ 1779 product(uintx, CMSConcMarkMultiple, 32, \ 1780 "Size (in cards) of CMS concurrent MT marking task") \ 1781 \ 1782 product(bool, CMSAbortSemantics, false, \ 1783 "Whether abort-on-overflow semantics is implemented") \ 1784 \ 1785 product(bool, CMSParallelInitialMarkEnabled, true, \ 1786 "Use the parallel initial mark.") \ 1787 \ 1788 product(bool, CMSParallelRemarkEnabled, true, \ 1789 "Whether parallel remark enabled (only if ParNewGC)") \ 1790 \ 1791 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1792 "Whether parallel remark of survivor space " \ 1793 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1794 \ 1795 product(bool, CMSPLABRecordAlways, true, \ 1796 "Always record survivor space PLAB boundaries (effective only " \ 1797 "if CMSParallelSurvivorRemarkEnabled)") \ 1798 \ 1799 product(bool, CMSEdenChunksRecordAlways, true, \ 1800 "Always record eden chunks used for the parallel initial mark " \ 1801 "or remark of eden") \ 1802 \ 1803 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1804 "Print the eden and the survivor chunks used for the parallel " \ 1805 "initial mark or remark of the eden/survivor spaces") \ 1806 \ 1807 product(bool, CMSConcurrentMTEnabled, true, \ 1808 "Whether multi-threaded concurrent work enabled " \ 1809 "(effective only if ParNewGC)") \ 1810 \ 1811 product(bool, CMSPrecleaningEnabled, true, \ 1812 "Whether concurrent precleaning enabled") \ 1813 \ 1814 product(uintx, CMSPrecleanIter, 3, \ 1815 "Maximum number of precleaning iteration passes") \ 1816 \ 1817 product(uintx, CMSPrecleanNumerator, 2, \ 1818 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1819 "ratio") \ 1820 \ 1821 product(uintx, CMSPrecleanDenominator, 3, \ 1822 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1823 "ratio") \ 1824 \ 1825 product(bool, CMSPrecleanRefLists1, true, \ 1826 "Preclean ref lists during (initial) preclean phase") \ 1827 \ 1828 product(bool, CMSPrecleanRefLists2, false, \ 1829 "Preclean ref lists during abortable preclean phase") \ 1830 \ 1831 product(bool, CMSPrecleanSurvivors1, false, \ 1832 "Preclean survivors during (initial) preclean phase") \ 1833 \ 1834 product(bool, CMSPrecleanSurvivors2, true, \ 1835 "Preclean survivors during abortable preclean phase") \ 1836 \ 1837 product(uintx, CMSPrecleanThreshold, 1000, \ 1838 "Do not iterate again if number of dirty cards is less than this")\ 1839 \ 1840 product(bool, CMSCleanOnEnter, true, \ 1841 "Clean-on-enter optimization for reducing number of dirty cards") \ 1842 \ 1843 product(uintx, CMSRemarkVerifyVariant, 1, \ 1844 "Choose variant (1,2) of verification following remark") \ 1845 \ 1846 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1847 "If Eden size is below this, do not try to schedule remark") \ 1848 \ 1849 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1850 "The Eden occupancy percentage (0-100) at which " \ 1851 "to try and schedule remark pause") \ 1852 \ 1853 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1854 "Start sampling eden top at least before young gen " \ 1855 "occupancy reaches 1/<ratio> of the size at which " \ 1856 "we plan to schedule remark") \ 1857 \ 1858 product(uintx, CMSSamplingGrain, 16*K, \ 1859 "The minimum distance between eden samples for CMS (see above)") \ 1860 \ 1861 product(bool, CMSScavengeBeforeRemark, false, \ 1862 "Attempt scavenge before the CMS remark step") \ 1863 \ 1864 develop(bool, CMSTraceSweeper, false, \ 1865 "Trace some actions of the CMS sweeper") \ 1866 \ 1867 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1868 "Don't drain below this size per parallel worker/thief") \ 1869 \ 1870 manageable(intx, CMSWaitDuration, 2000, \ 1871 "Time in milliseconds that CMS thread waits for young GC") \ 1872 \ 1873 develop(uintx, CMSCheckInterval, 1000, \ 1874 "Interval in milliseconds that CMS thread checks if it " \ 1875 "should start a collection cycle") \ 1876 \ 1877 product(bool, CMSYield, true, \ 1878 "Yield between steps of CMS") \ 1879 \ 1880 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1881 "Bitmap operations should process at most this many bits " \ 1882 "between yields") \ 1883 \ 1884 product(bool, CMSDumpAtPromotionFailure, false, \ 1885 "Dump useful information about the state of the CMS old " \ 1886 "generation upon a promotion failure") \ 1887 \ 1888 product(bool, CMSPrintChunksInDump, false, \ 1889 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1890 "more detailed information about the free chunks") \ 1891 \ 1892 product(bool, CMSPrintObjectsInDump, false, \ 1893 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1894 "more detailed information about the allocated objects") \ 1895 \ 1896 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1897 "Verify that all references across the FLS boundary " \ 1898 "are to valid objects") \ 1899 \ 1900 diagnostic(bool, FLSVerifyLists, false, \ 1901 "Do lots of (expensive) FreeListSpace verification") \ 1902 \ 1903 diagnostic(bool, FLSVerifyIndexTable, false, \ 1904 "Do lots of (expensive) FLS index table verification") \ 1905 \ 1906 develop(bool, FLSVerifyDictionary, false, \ 1907 "Do lots of (expensive) FLS dictionary verification") \ 1908 \ 1909 develop(bool, VerifyBlockOffsetArray, false, \ 1910 "Do (expensive) block offset array verification") \ 1911 \ 1912 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1913 "Maintain _unallocated_block in BlockOffsetArray " \ 1914 "(currently applicable only to CMS collector)") \ 1915 \ 1916 develop(bool, TraceCMSState, false, \ 1917 "Trace the state of the CMS collection") \ 1918 \ 1919 product(intx, RefDiscoveryPolicy, 0, \ 1920 "Select type of reference discovery policy: " \ 1921 "reference-based(0) or referent-based(1)") \ 1922 \ 1923 product(bool, ParallelRefProcEnabled, false, \ 1924 "Enable parallel reference processing whenever possible") \ 1925 \ 1926 product(bool, ParallelRefProcBalancingEnabled, true, \ 1927 "Enable balancing of reference processing queues") \ 1928 \ 1929 product(uintx, CMSTriggerRatio, 80, \ 1930 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1931 "allocated before a CMS collection cycle commences") \ 1932 \ 1933 product(uintx, CMSBootstrapOccupancy, 50, \ 1934 "Percentage CMS generation occupancy at which to " \ 1935 "initiate CMS collection for bootstrapping collection stats") \ 1936 \ 1937 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1938 "Percentage CMS generation occupancy to start a CMS collection " \ 1939 "cycle. A negative value means that CMSTriggerRatio is used") \ 1940 \ 1941 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1942 "Percentage of the (entire) heap occupancy to start a " \ 1943 "concurrent GC cycle. It is used by GCs that trigger a " \ 1944 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1945 "not just one of the generations (e.g., G1). A value of 0 " \ 1946 "denotes 'do constant GC cycles'.") \ 1947 \ 1948 manageable(intx, CMSTriggerInterval, -1, \ 1949 "Commence a CMS collection cycle (at least) every so many " \ 1950 "milliseconds (0 permanently, -1 disabled)") \ 1951 \ 1952 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1953 "Only use occupancy as a criterion for starting a CMS collection")\ 1954 \ 1955 product(uintx, CMSIsTooFullPercentage, 98, \ 1956 "An absolute ceiling above which CMS will always consider the " \ 1957 "unloading of classes when class unloading is enabled") \ 1958 \ 1959 develop(bool, CMSTestInFreeList, false, \ 1960 "Check if the coalesced range is already in the " \ 1961 "free lists as claimed") \ 1962 \ 1963 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1964 "Check that all the garbage collected was returned to the " \ 1965 "free lists") \ 1966 \ 1967 notproduct(bool, ScavengeALot, false, \ 1968 "Force scavenge at every Nth exit from the runtime system " \ 1969 "(N=ScavengeALotInterval)") \ 1970 \ 1971 develop(bool, FullGCALot, false, \ 1972 "Force full gc at every Nth exit from the runtime system " \ 1973 "(N=FullGCALotInterval)") \ 1974 \ 1975 notproduct(bool, GCALotAtAllSafepoints, false, \ 1976 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1977 \ 1978 product(bool, PrintPromotionFailure, false, \ 1979 "Print additional diagnostic information following " \ 1980 "promotion failure") \ 1981 \ 1982 notproduct(bool, PromotionFailureALot, false, \ 1983 "Use promotion failure handling on every youngest generation " \ 1984 "collection") \ 1985 \ 1986 develop(uintx, PromotionFailureALotCount, 1000, \ 1987 "Number of promotion failures occurring at ParGCAllocBuffer " \ 1988 "refill attempts (ParNew) or promotion attempts " \ 1989 "(other young collectors)") \ 1990 \ 1991 develop(uintx, PromotionFailureALotInterval, 5, \ 1992 "Total collections between promotion failures alot") \ 1993 \ 1994 experimental(uintx, WorkStealingSleepMillis, 1, \ 1995 "Sleep time when sleep is used for yields") \ 1996 \ 1997 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1998 "Number of yields before a sleep is done during workstealing") \ 1999 \ 2000 experimental(uintx, WorkStealingHardSpins, 4096, \ 2001 "Number of iterations in a spin loop between checks on " \ 2002 "time out of hard spin") \ 2003 \ 2004 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2005 "Ratio of hard spins to calls to yield") \ 2006 \ 2007 develop(uintx, ObjArrayMarkingStride, 512, \ 2008 "Number of object array elements to push onto the marking stack " \ 2009 "before pushing a continuation entry") \ 2010 \ 2011 develop(bool, MetadataAllocationFailALot, false, \ 2012 "Fail metadata allocations at intervals controlled by " \ 2013 "MetadataAllocationFailALotInterval") \ 2014 \ 2015 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2016 "Metadata allocation failure a lot interval") \ 2017 \ 2018 develop(bool, TraceMetadataChunkAllocation, false, \ 2019 "Trace chunk metadata allocations") \ 2020 \ 2021 product(bool, TraceMetadataHumongousAllocation, false, \ 2022 "Trace humongous metadata allocations") \ 2023 \ 2024 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2025 "Trace virtual space metadata allocations") \ 2026 \ 2027 notproduct(bool, ExecuteInternalVMTests, false, \ 2028 "Enable execution of internal VM tests") \ 2029 \ 2030 notproduct(bool, VerboseInternalVMTests, false, \ 2031 "Turn on logging for internal VM tests.") \ 2032 \ 2033 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2034 \ 2035 product_pd(bool, ResizeTLAB, \ 2036 "Dynamically resize TLAB size for threads") \ 2037 \ 2038 product(bool, ZeroTLAB, false, \ 2039 "Zero out the newly created TLAB") \ 2040 \ 2041 product(bool, FastTLABRefill, true, \ 2042 "Use fast TLAB refill code") \ 2043 \ 2044 product(bool, PrintTLAB, false, \ 2045 "Print various TLAB related information") \ 2046 \ 2047 product(bool, TLABStats, true, \ 2048 "Provide more detailed and expensive TLAB statistics " \ 2049 "(with PrintTLAB)") \ 2050 \ 2051 product_pd(bool, NeverActAsServerClassMachine, \ 2052 "Never act like a server-class machine") \ 2053 \ 2054 product(bool, AlwaysActAsServerClassMachine, false, \ 2055 "Always act like a server-class machine") \ 2056 \ 2057 product_pd(uint64_t, MaxRAM, \ 2058 "Real memory size (in bytes) used to set maximum heap size") \ 2059 \ 2060 product(uintx, ErgoHeapSizeLimit, 0, \ 2061 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2062 "MaxRAM / MaxRAMFraction") \ 2063 \ 2064 product(uintx, MaxRAMFraction, 4, \ 2065 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2066 "size") \ 2067 \ 2068 product(uintx, DefaultMaxRAMFraction, 4, \ 2069 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2070 "size; deprecated: to be renamed to MaxRAMFraction") \ 2071 \ 2072 product(uintx, MinRAMFraction, 2, \ 2073 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2074 "size on systems with small physical memory size") \ 2075 \ 2076 product(uintx, InitialRAMFraction, 64, \ 2077 "Fraction (1/n) of real memory used for initial heap size") \ 2078 \ 2079 develop(uintx, MaxVirtMemFraction, 2, \ 2080 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2081 "determining maximum heap size") \ 2082 \ 2083 product(bool, UseAutoGCSelectPolicy, false, \ 2084 "Use automatic collection selection policy") \ 2085 \ 2086 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2087 "Automatic GC selection pause threshold in milliseconds") \ 2088 \ 2089 product(bool, UseAdaptiveSizePolicy, true, \ 2090 "Use adaptive generation sizing policies") \ 2091 \ 2092 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2093 "Use adaptive survivor sizing policies") \ 2094 \ 2095 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2096 "Use adaptive young-old sizing policies at minor collections") \ 2097 \ 2098 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2099 "Use adaptive young-old sizing policies at major collections") \ 2100 \ 2101 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2102 "Include statistics from System.gc() for adaptive size policy") \ 2103 \ 2104 product(bool, UseAdaptiveGCBoundary, false, \ 2105 "Allow young-old boundary to move") \ 2106 \ 2107 develop(bool, TraceAdaptiveGCBoundary, false, \ 2108 "Trace young-old boundary moves") \ 2109 \ 2110 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2111 "Resize the virtual spaces of the young or old generations") \ 2112 \ 2113 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2114 "Policy for changing generation size for throughput goals") \ 2115 \ 2116 product(uintx, AdaptiveSizePausePolicy, 0, \ 2117 "Policy for changing generation size for pause goals") \ 2118 \ 2119 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2120 "Adjust tenured generation to achieve a minor pause goal") \ 2121 \ 2122 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2123 "Adjust young generation to achieve a major pause goal") \ 2124 \ 2125 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2126 "Number of steps where heuristics is used before data is used") \ 2127 \ 2128 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2129 "Number of collections before the adaptive sizing is started") \ 2130 \ 2131 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2132 "Collection interval for printing information; zero means never") \ 2133 \ 2134 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2135 "Use adaptive minimum footprint as a goal") \ 2136 \ 2137 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2138 "Weight given to exponential resizing, between 0 and 100") \ 2139 \ 2140 product(uintx, AdaptiveTimeWeight, 25, \ 2141 "Weight given to time in adaptive policy, between 0 and 100") \ 2142 \ 2143 product(uintx, PausePadding, 1, \ 2144 "How much buffer to keep for pause time") \ 2145 \ 2146 product(uintx, PromotedPadding, 3, \ 2147 "How much buffer to keep for promotion failure") \ 2148 \ 2149 product(uintx, SurvivorPadding, 3, \ 2150 "How much buffer to keep for survivor overflow") \ 2151 \ 2152 product(uintx, ThresholdTolerance, 10, \ 2153 "Allowed collection cost difference between generations") \ 2154 \ 2155 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2156 "If collection costs are within margin, reduce both by full " \ 2157 "delta") \ 2158 \ 2159 product(uintx, YoungGenerationSizeIncrement, 20, \ 2160 "Adaptive size percentage change in young generation") \ 2161 \ 2162 product(uintx, YoungGenerationSizeSupplement, 80, \ 2163 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2164 \ 2165 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2166 "Decay factor to YoungedGenerationSizeSupplement") \ 2167 \ 2168 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2169 "Adaptive size percentage change in tenured generation") \ 2170 \ 2171 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2172 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2173 \ 2174 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2175 "Decay factor to TenuredGenerationSizeIncrement") \ 2176 \ 2177 product(uintx, MaxGCPauseMillis, max_uintx, \ 2178 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2179 "or (G1 Only) the maximum GC time per MMU time slice") \ 2180 \ 2181 product(uintx, GCPauseIntervalMillis, 0, \ 2182 "Time slice for MMU specification") \ 2183 \ 2184 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2185 "Adaptive size policy maximum GC minor pause time goal " \ 2186 "in millisecond") \ 2187 \ 2188 product(uintx, GCTimeRatio, 99, \ 2189 "Adaptive size policy application time to GC time ratio") \ 2190 \ 2191 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2192 "Adaptive size scale down factor for shrinking") \ 2193 \ 2194 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2195 "Adaptive size decays the major cost for long major intervals") \ 2196 \ 2197 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2198 "Time scale over which major costs decay") \ 2199 \ 2200 product(uintx, MinSurvivorRatio, 3, \ 2201 "Minimum ratio of young generation/survivor space size") \ 2202 \ 2203 product(uintx, InitialSurvivorRatio, 8, \ 2204 "Initial ratio of young generation/survivor space size") \ 2205 \ 2206 product(uintx, BaseFootPrintEstimate, 256*M, \ 2207 "Estimate of footprint other than Java Heap") \ 2208 \ 2209 product(bool, UseGCOverheadLimit, true, \ 2210 "Use policy to limit of proportion of time spent in GC " \ 2211 "before an OutOfMemory error is thrown") \ 2212 \ 2213 product(uintx, GCTimeLimit, 98, \ 2214 "Limit of the proportion of time spent in GC before " \ 2215 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2216 \ 2217 product(uintx, GCHeapFreeLimit, 2, \ 2218 "Minimum percentage of free space after a full GC before an " \ 2219 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2220 \ 2221 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2222 "Number of consecutive collections before gc time limit fires") \ 2223 \ 2224 product(bool, PrintAdaptiveSizePolicy, false, \ 2225 "Print information about AdaptiveSizePolicy") \ 2226 \ 2227 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2228 "How far ahead to prefetch destination area (<= 0 means off)") \ 2229 \ 2230 product(intx, PrefetchScanIntervalInBytes, -1, \ 2231 "How far ahead to prefetch scan area (<= 0 means off)") \ 2232 \ 2233 product(intx, PrefetchFieldsAhead, -1, \ 2234 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2235 \ 2236 diagnostic(bool, VerifySilently, false, \ 2237 "Do not print the verification progress") \ 2238 \ 2239 diagnostic(bool, VerifyDuringStartup, false, \ 2240 "Verify memory system before executing any Java code " \ 2241 "during VM initialization") \ 2242 \ 2243 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2244 "Verify system before exiting") \ 2245 \ 2246 diagnostic(bool, VerifyBeforeGC, false, \ 2247 "Verify memory system before GC") \ 2248 \ 2249 diagnostic(bool, VerifyAfterGC, false, \ 2250 "Verify memory system after GC") \ 2251 \ 2252 diagnostic(bool, VerifyDuringGC, false, \ 2253 "Verify memory system during GC (between phases)") \ 2254 \ 2255 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2256 "Enable parallel memory system verification") \ 2257 \ 2258 diagnostic(bool, DeferInitialCardMark, false, \ 2259 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2260 "may arise from new_pre_store_barrier") \ 2261 \ 2262 diagnostic(bool, VerifyRememberedSets, false, \ 2263 "Verify GC remembered sets") \ 2264 \ 2265 diagnostic(bool, VerifyObjectStartArray, true, \ 2266 "Verify GC object start array if verify before/after") \ 2267 \ 2268 product(bool, DisableExplicitGC, false, \ 2269 "Ignore calls to System.gc()") \ 2270 \ 2271 notproduct(bool, CheckMemoryInitialization, false, \ 2272 "Check memory initialization") \ 2273 \ 2274 product(bool, CollectGen0First, false, \ 2275 "Collect youngest generation before each full GC") \ 2276 \ 2277 diagnostic(bool, BindCMSThreadToCPU, false, \ 2278 "Bind CMS Thread to CPU if possible") \ 2279 \ 2280 diagnostic(uintx, CPUForCMSThread, 0, \ 2281 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2282 \ 2283 product(bool, BindGCTaskThreadsToCPUs, false, \ 2284 "Bind GCTaskThreads to CPUs if possible") \ 2285 \ 2286 product(bool, UseGCTaskAffinity, false, \ 2287 "Use worker affinity when asking for GCTasks") \ 2288 \ 2289 product(uintx, ProcessDistributionStride, 4, \ 2290 "Stride through processors when distributing processes") \ 2291 \ 2292 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2293 "Number of times the coordinator GC thread will sleep while " \ 2294 "yielding before giving up and resuming GC") \ 2295 \ 2296 product(uintx, CMSYieldSleepCount, 0, \ 2297 "Number of times a GC thread (minus the coordinator) " \ 2298 "will sleep while yielding before giving up and resuming GC") \ 2299 \ 2300 /* gc tracing */ \ 2301 manageable(bool, PrintGC, false, \ 2302 "Print message at garbage collection") \ 2303 \ 2304 manageable(bool, PrintGCDetails, false, \ 2305 "Print more details at garbage collection") \ 2306 \ 2307 manageable(bool, PrintGCDateStamps, false, \ 2308 "Print date stamps at garbage collection") \ 2309 \ 2310 manageable(bool, PrintGCTimeStamps, false, \ 2311 "Print timestamps at garbage collection") \ 2312 \ 2313 manageable(bool, PrintGCID, false, \ 2314 "Print an identifier for each garbage collection") \ 2315 \ 2316 product(bool, PrintGCTaskTimeStamps, false, \ 2317 "Print timestamps for individual gc worker thread tasks") \ 2318 \ 2319 develop(intx, ConcGCYieldTimeout, 0, \ 2320 "If non-zero, assert that GC threads yield within this " \ 2321 "number of milliseconds") \ 2322 \ 2323 notproduct(bool, TraceMarkSweep, false, \ 2324 "Trace mark sweep") \ 2325 \ 2326 product(bool, PrintReferenceGC, false, \ 2327 "Print times spent handling reference objects during GC " \ 2328 "(enabled only when PrintGCDetails)") \ 2329 \ 2330 develop(bool, TraceReferenceGC, false, \ 2331 "Trace handling of soft/weak/final/phantom references") \ 2332 \ 2333 develop(bool, TraceFinalizerRegistration, false, \ 2334 "Trace registration of final references") \ 2335 \ 2336 notproduct(bool, TraceScavenge, false, \ 2337 "Trace scavenge") \ 2338 \ 2339 product(bool, IgnoreEmptyClassPaths, false, \ 2340 "Ignore empty path elements in -classpath") \ 2341 \ 2342 product(bool, TraceClassPaths, false, \ 2343 "Trace processing of class paths") \ 2344 \ 2345 product_rw(bool, TraceClassLoading, false, \ 2346 "Trace all classes loaded") \ 2347 \ 2348 product(bool, TraceClassLoadingPreorder, false, \ 2349 "Trace all classes loaded in order referenced (not loaded)") \ 2350 \ 2351 product_rw(bool, TraceClassUnloading, false, \ 2352 "Trace unloading of classes") \ 2353 \ 2354 product_rw(bool, TraceLoaderConstraints, false, \ 2355 "Trace loader constraints") \ 2356 \ 2357 develop(bool, TraceClassLoaderData, false, \ 2358 "Trace class loader loader_data lifetime") \ 2359 \ 2360 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2361 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2362 "Initial size of the boot class loader data metaspace") \ 2363 \ 2364 product(bool, TraceGen0Time, false, \ 2365 "Trace accumulated time for Gen 0 collection") \ 2366 \ 2367 product(bool, TraceGen1Time, false, \ 2368 "Trace accumulated time for Gen 1 collection") \ 2369 \ 2370 product(bool, PrintTenuringDistribution, false, \ 2371 "Print tenuring age information") \ 2372 \ 2373 product_rw(bool, PrintHeapAtGC, false, \ 2374 "Print heap layout before and after each GC") \ 2375 \ 2376 product_rw(bool, PrintHeapAtGCExtended, false, \ 2377 "Print extended information about the layout of the heap " \ 2378 "when -XX:+PrintHeapAtGC is set") \ 2379 \ 2380 product(bool, PrintHeapAtSIGBREAK, true, \ 2381 "Print heap layout in response to SIGBREAK") \ 2382 \ 2383 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2384 "Print a class histogram before any major stop-world GC") \ 2385 \ 2386 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2387 "Print a class histogram after any major stop-world GC") \ 2388 \ 2389 manageable(bool, PrintClassHistogram, false, \ 2390 "Print a histogram of class instances") \ 2391 \ 2392 develop(bool, TraceWorkGang, false, \ 2393 "Trace activities of work gangs") \ 2394 \ 2395 product(bool, TraceParallelOldGCTasks, false, \ 2396 "Trace multithreaded GC activity") \ 2397 \ 2398 develop(bool, TraceBlockOffsetTable, false, \ 2399 "Print BlockOffsetTable maps") \ 2400 \ 2401 develop(bool, TraceCardTableModRefBS, false, \ 2402 "Print CardTableModRefBS maps") \ 2403 \ 2404 develop(bool, TraceGCTaskManager, false, \ 2405 "Trace actions of the GC task manager") \ 2406 \ 2407 develop(bool, TraceGCTaskQueue, false, \ 2408 "Trace actions of the GC task queues") \ 2409 \ 2410 diagnostic(bool, TraceGCTaskThread, false, \ 2411 "Trace actions of the GC task threads") \ 2412 \ 2413 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2414 "Print the time taken by each phase in ParallelOldGC " \ 2415 "(PrintGCDetails must also be enabled)") \ 2416 \ 2417 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2418 "Trace marking phase in ParallelOldGC") \ 2419 \ 2420 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2421 "Trace summary phase in ParallelOldGC") \ 2422 \ 2423 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2424 "Trace compaction phase in ParallelOldGC") \ 2425 \ 2426 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2427 "Trace dense prefix computation for ParallelOldGC") \ 2428 \ 2429 develop(bool, IgnoreLibthreadGPFault, false, \ 2430 "Suppress workaround for libthread GP fault") \ 2431 \ 2432 product(bool, PrintJNIGCStalls, false, \ 2433 "Print diagnostic message when GC is stalled " \ 2434 "by JNI critical section") \ 2435 \ 2436 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2437 "The percentage of the used heap that the instances of a class " \ 2438 "must occupy for the class to generate a trace event") \ 2439 \ 2440 /* GC log rotation setting */ \ 2441 \ 2442 product(bool, UseGCLogFileRotation, false, \ 2443 "Rotate gclog files (for long running applications). It requires "\ 2444 "-Xloggc:<filename>") \ 2445 \ 2446 product(uintx, NumberOfGCLogFiles, 0, \ 2447 "Number of gclog files in rotation " \ 2448 "(default: 0, no rotation)") \ 2449 \ 2450 product(uintx, GCLogFileSize, 8*K, \ 2451 "GC log file size, requires UseGCLogFileRotation. " \ 2452 "Set to 0 to only trigger rotation via jcmd") \ 2453 \ 2454 /* JVMTI heap profiling */ \ 2455 \ 2456 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2457 "Trace JVMTI object tagging calls") \ 2458 \ 2459 diagnostic(bool, VerifyBeforeIteration, false, \ 2460 "Verify memory system before JVMTI iteration") \ 2461 \ 2462 /* compiler interface */ \ 2463 \ 2464 develop(bool, CIPrintCompilerName, false, \ 2465 "when CIPrint is active, print the name of the active compiler") \ 2466 \ 2467 develop(bool, CIPrintCompileQueue, false, \ 2468 "display the contents of the compile queue whenever a " \ 2469 "compilation is enqueued") \ 2470 \ 2471 develop(bool, CIPrintRequests, false, \ 2472 "display every request for compilation") \ 2473 \ 2474 product(bool, CITime, false, \ 2475 "collect timing information for compilation") \ 2476 \ 2477 develop(bool, CITimeEach, false, \ 2478 "display timing information after each successful compilation") \ 2479 \ 2480 develop(bool, CICountOSR, false, \ 2481 "use a separate counter when assigning ids to osr compilations") \ 2482 \ 2483 develop(bool, CICompileNatives, true, \ 2484 "compile native methods if supported by the compiler") \ 2485 \ 2486 develop_pd(bool, CICompileOSR, \ 2487 "compile on stack replacement methods if supported by the " \ 2488 "compiler") \ 2489 \ 2490 develop(bool, CIPrintMethodCodes, false, \ 2491 "print method bytecodes of the compiled code") \ 2492 \ 2493 develop(bool, CIPrintTypeFlow, false, \ 2494 "print the results of ciTypeFlow analysis") \ 2495 \ 2496 develop(bool, CITraceTypeFlow, false, \ 2497 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2498 \ 2499 develop(intx, OSROnlyBCI, -1, \ 2500 "OSR only at this bci. Negative values mean exclude that bci") \ 2501 \ 2502 /* compiler */ \ 2503 \ 2504 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2505 "Number of compiler threads to run") \ 2506 \ 2507 product(intx, CompilationPolicyChoice, 0, \ 2508 "which compilation policy (0/1)") \ 2509 \ 2510 develop(bool, UseStackBanging, true, \ 2511 "use stack banging for stack overflow checks (required for " \ 2512 "proper StackOverflow handling; disable only to measure cost " \ 2513 "of stackbanging)") \ 2514 \ 2515 develop(bool, UseStrictFP, true, \ 2516 "use strict fp if modifier strictfp is set") \ 2517 \ 2518 develop(bool, GenerateSynchronizationCode, true, \ 2519 "generate locking/unlocking code for synchronized methods and " \ 2520 "monitors") \ 2521 \ 2522 develop(bool, GenerateCompilerNullChecks, true, \ 2523 "Generate explicit null checks for loads/stores/calls") \ 2524 \ 2525 develop(bool, GenerateRangeChecks, true, \ 2526 "Generate range checks for array accesses") \ 2527 \ 2528 develop_pd(bool, ImplicitNullChecks, \ 2529 "Generate code for implicit null checks") \ 2530 \ 2531 product_pd(bool, TrapBasedNullChecks, \ 2532 "Generate code for null checks that uses a cmp and trap " \ 2533 "instruction raising SIGTRAP. This is only used if an access to" \ 2534 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2535 "ImplicitNullChecks don't work (PPC64).") \ 2536 \ 2537 product(bool, PrintSafepointStatistics, false, \ 2538 "Print statistics about safepoint synchronization") \ 2539 \ 2540 product(intx, PrintSafepointStatisticsCount, 300, \ 2541 "Total number of safepoint statistics collected " \ 2542 "before printing them out") \ 2543 \ 2544 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2545 "Print safepoint statistics only when safepoint takes " \ 2546 "more than PrintSafepointSatisticsTimeout in millis") \ 2547 \ 2548 product(bool, TraceSafepointCleanupTime, false, \ 2549 "Print the break down of clean up tasks performed during " \ 2550 "safepoint") \ 2551 \ 2552 product(bool, Inline, true, \ 2553 "Enable inlining") \ 2554 \ 2555 product(bool, ClipInlining, true, \ 2556 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2557 \ 2558 develop(bool, UseCHA, true, \ 2559 "Enable CHA") \ 2560 \ 2561 product(bool, UseTypeProfile, true, \ 2562 "Check interpreter profile for historically monomorphic calls") \ 2563 \ 2564 notproduct(bool, TimeCompiler, false, \ 2565 "Time the compiler") \ 2566 \ 2567 diagnostic(bool, PrintInlining, false, \ 2568 "Print inlining optimizations") \ 2569 \ 2570 product(bool, UsePopCountInstruction, false, \ 2571 "Use population count instruction") \ 2572 \ 2573 develop(bool, EagerInitialization, false, \ 2574 "Eagerly initialize classes if possible") \ 2575 \ 2576 develop(bool, TraceMethodReplacement, false, \ 2577 "Print when methods are replaced do to recompilation") \ 2578 \ 2579 develop(bool, PrintMethodFlushing, false, \ 2580 "Print the nmethods being flushed") \ 2581 \ 2582 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2583 "print statistics about method flushing") \ 2584 \ 2585 develop(bool, UseRelocIndex, false, \ 2586 "Use an index to speed random access to relocations") \ 2587 \ 2588 develop(bool, StressCodeBuffers, false, \ 2589 "Exercise code buffer expansion and other rare state changes") \ 2590 \ 2591 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2592 "Generate extra debugging information for non-safepoints in " \ 2593 "nmethods") \ 2594 \ 2595 product(bool, PrintVMOptions, false, \ 2596 "Print flags that appeared on the command line") \ 2597 \ 2598 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2599 "Ignore unrecognized VM options") \ 2600 \ 2601 product(bool, PrintCommandLineFlags, false, \ 2602 "Print flags specified on command line or set by ergonomics") \ 2603 \ 2604 product(bool, PrintFlagsInitial, false, \ 2605 "Print all VM flags before argument processing and exit VM") \ 2606 \ 2607 product(bool, PrintFlagsFinal, false, \ 2608 "Print all VM flags after argument and ergonomic processing") \ 2609 \ 2610 notproduct(bool, PrintFlagsWithComments, false, \ 2611 "Print all VM flags with default values and descriptions and " \ 2612 "exit") \ 2613 \ 2614 diagnostic(bool, SerializeVMOutput, true, \ 2615 "Use a mutex to serialize output to tty and LogFile") \ 2616 \ 2617 diagnostic(bool, DisplayVMOutput, true, \ 2618 "Display all VM output on the tty, independently of LogVMOutput") \ 2619 \ 2620 diagnostic(bool, LogVMOutput, false, \ 2621 "Save VM output to LogFile") \ 2622 \ 2623 diagnostic(ccstr, LogFile, NULL, \ 2624 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2625 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2626 \ 2627 product(ccstr, ErrorFile, NULL, \ 2628 "If an error occurs, save the error data to this file " \ 2629 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2630 \ 2631 product(bool, DisplayVMOutputToStderr, false, \ 2632 "If DisplayVMOutput is true, display all VM output to stderr") \ 2633 \ 2634 product(bool, DisplayVMOutputToStdout, false, \ 2635 "If DisplayVMOutput is true, display all VM output to stdout") \ 2636 \ 2637 product(bool, UseHeavyMonitors, false, \ 2638 "use heavyweight instead of lightweight Java monitors") \ 2639 \ 2640 product(bool, PrintStringTableStatistics, false, \ 2641 "print statistics about the StringTable and SymbolTable") \ 2642 \ 2643 diagnostic(bool, VerifyStringTableAtExit, false, \ 2644 "verify StringTable contents at exit") \ 2645 \ 2646 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2647 "print histogram of the symbol table") \ 2648 \ 2649 notproduct(bool, ExitVMOnVerifyError, false, \ 2650 "standard exit from VM if bytecode verify error " \ 2651 "(only in debug mode)") \ 2652 \ 2653 notproduct(ccstr, AbortVMOnException, NULL, \ 2654 "Call fatal if this exception is thrown. Example: " \ 2655 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2656 \ 2657 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2658 "Call fatal if the exception pointed by AbortVMOnException " \ 2659 "has this message") \ 2660 \ 2661 develop(bool, DebugVtables, false, \ 2662 "add debugging code to vtable dispatch") \ 2663 \ 2664 develop(bool, PrintVtables, false, \ 2665 "print vtables when printing klass") \ 2666 \ 2667 notproduct(bool, PrintVtableStats, false, \ 2668 "print vtables stats at end of run") \ 2669 \ 2670 develop(bool, TraceCreateZombies, false, \ 2671 "trace creation of zombie nmethods") \ 2672 \ 2673 notproduct(bool, IgnoreLockingAssertions, false, \ 2674 "disable locking assertions (for speed)") \ 2675 \ 2676 product(bool, RangeCheckElimination, true, \ 2677 "Eliminate range checks") \ 2678 \ 2679 develop_pd(bool, UncommonNullCast, \ 2680 "track occurrences of null in casts; adjust compiler tactics") \ 2681 \ 2682 develop(bool, TypeProfileCasts, true, \ 2683 "treat casts like calls for purposes of type profiling") \ 2684 \ 2685 develop(bool, DelayCompilationDuringStartup, true, \ 2686 "Delay invoking the compiler until main application class is " \ 2687 "loaded") \ 2688 \ 2689 develop(bool, CompileTheWorld, false, \ 2690 "Compile all methods in all classes in bootstrap class path " \ 2691 "(stress test)") \ 2692 \ 2693 develop(bool, CompileTheWorldPreloadClasses, true, \ 2694 "Preload all classes used by a class before start loading") \ 2695 \ 2696 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2697 "Force a safepoint every n compiles so sweeper can keep up") \ 2698 \ 2699 develop(bool, FillDelaySlots, true, \ 2700 "Fill delay slots (on SPARC only)") \ 2701 \ 2702 develop(bool, TimeLivenessAnalysis, false, \ 2703 "Time computation of bytecode liveness analysis") \ 2704 \ 2705 develop(bool, TraceLivenessGen, false, \ 2706 "Trace the generation of liveness analysis information") \ 2707 \ 2708 notproduct(bool, TraceLivenessQuery, false, \ 2709 "Trace queries of liveness analysis information") \ 2710 \ 2711 notproduct(bool, CollectIndexSetStatistics, false, \ 2712 "Collect information about IndexSets") \ 2713 \ 2714 develop(bool, UseLoopSafepoints, true, \ 2715 "Generate Safepoint nodes in every loop") \ 2716 \ 2717 develop(intx, FastAllocateSizeLimit, 128*K, \ 2718 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2719 "Inline allocations larger than this in doublewords must go slow")\ 2720 \ 2721 product(bool, AggressiveOpts, false, \ 2722 "Enable aggressive optimizations - see arguments.cpp") \ 2723 \ 2724 product_pd(uintx, TypeProfileLevel, \ 2725 "=XYZ, with Z: Type profiling of arguments at call; " \ 2726 "Y: Type profiling of return value at call; " \ 2727 "X: Type profiling of parameters to methods; " \ 2728 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2729 \ 2730 product(intx, TypeProfileArgsLimit, 2, \ 2731 "max number of call arguments to consider for type profiling") \ 2732 \ 2733 product(intx, TypeProfileParmsLimit, 2, \ 2734 "max number of incoming parameters to consider for type profiling"\ 2735 ", -1 for all") \ 2736 \ 2737 /* statistics */ \ 2738 develop(bool, CountCompiledCalls, false, \ 2739 "Count method invocations") \ 2740 \ 2741 notproduct(bool, CountRuntimeCalls, false, \ 2742 "Count VM runtime calls") \ 2743 \ 2744 develop(bool, CountJNICalls, false, \ 2745 "Count jni method invocations") \ 2746 \ 2747 notproduct(bool, CountJVMCalls, false, \ 2748 "Count jvm method invocations") \ 2749 \ 2750 notproduct(bool, CountRemovableExceptions, false, \ 2751 "Count exceptions that could be replaced by branches due to " \ 2752 "inlining") \ 2753 \ 2754 notproduct(bool, ICMissHistogram, false, \ 2755 "Produce histogram of IC misses") \ 2756 \ 2757 notproduct(bool, PrintClassStatistics, false, \ 2758 "Print class statistics at end of run") \ 2759 \ 2760 notproduct(bool, PrintMethodStatistics, false, \ 2761 "Print method statistics at end of run") \ 2762 \ 2763 /* interpreter */ \ 2764 develop(bool, ClearInterpreterLocals, false, \ 2765 "Always clear local variables of interpreter activations upon " \ 2766 "entry") \ 2767 \ 2768 product_pd(bool, RewriteBytecodes, \ 2769 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2770 \ 2771 product_pd(bool, RewriteFrequentPairs, \ 2772 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2773 \ 2774 diagnostic(bool, PrintInterpreter, false, \ 2775 "Print the generated interpreter code") \ 2776 \ 2777 product(bool, UseInterpreter, true, \ 2778 "Use interpreter for non-compiled methods") \ 2779 \ 2780 develop(bool, UseFastSignatureHandlers, true, \ 2781 "Use fast signature handlers for native calls") \ 2782 \ 2783 product(bool, UseLoopCounter, true, \ 2784 "Increment invocation counter on backward branch") \ 2785 \ 2786 product(bool, UseFastEmptyMethods, true, \ 2787 "Use fast method entry code for empty methods") \ 2788 \ 2789 product(bool, UseFastAccessorMethods, true, \ 2790 "Use fast method entry code for accessor methods") \ 2791 \ 2792 product_pd(bool, UseOnStackReplacement, \ 2793 "Use on stack replacement, calls runtime if invoc. counter " \ 2794 "overflows in loop") \ 2795 \ 2796 notproduct(bool, TraceOnStackReplacement, false, \ 2797 "Trace on stack replacement") \ 2798 \ 2799 product_pd(bool, PreferInterpreterNativeStubs, \ 2800 "Use always interpreter stubs for native methods invoked via " \ 2801 "interpreter") \ 2802 \ 2803 develop(bool, CountBytecodes, false, \ 2804 "Count number of bytecodes executed") \ 2805 \ 2806 develop(bool, PrintBytecodeHistogram, false, \ 2807 "Print histogram of the executed bytecodes") \ 2808 \ 2809 develop(bool, PrintBytecodePairHistogram, false, \ 2810 "Print histogram of the executed bytecode pairs") \ 2811 \ 2812 diagnostic(bool, PrintSignatureHandlers, false, \ 2813 "Print code generated for native method signature handlers") \ 2814 \ 2815 develop(bool, VerifyOops, false, \ 2816 "Do plausibility checks for oops") \ 2817 \ 2818 develop(bool, CheckUnhandledOops, false, \ 2819 "Check for unhandled oops in VM code") \ 2820 \ 2821 develop(bool, VerifyJNIFields, trueInDebug, \ 2822 "Verify jfieldIDs for instance fields") \ 2823 \ 2824 notproduct(bool, VerifyJNIEnvThread, false, \ 2825 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2826 "from JNI") \ 2827 \ 2828 develop(bool, VerifyFPU, false, \ 2829 "Verify FPU state (check for NaN's, etc.)") \ 2830 \ 2831 develop(bool, VerifyThread, false, \ 2832 "Watch the thread register for corruption (SPARC only)") \ 2833 \ 2834 develop(bool, VerifyActivationFrameSize, false, \ 2835 "Verify that activation frame didn't become smaller than its " \ 2836 "minimal size") \ 2837 \ 2838 develop(bool, TraceFrequencyInlining, false, \ 2839 "Trace frequency based inlining") \ 2840 \ 2841 develop_pd(bool, InlineIntrinsics, \ 2842 "Inline intrinsics that can be statically resolved") \ 2843 \ 2844 product_pd(bool, ProfileInterpreter, \ 2845 "Profile at the bytecode level during interpretation") \ 2846 \ 2847 develop(bool, TraceProfileInterpreter, false, \ 2848 "Trace profiling at the bytecode level during interpretation. " \ 2849 "This outputs the profiling information collected to improve " \ 2850 "jit compilation.") \ 2851 \ 2852 develop_pd(bool, ProfileTraps, \ 2853 "Profile deoptimization traps at the bytecode level") \ 2854 \ 2855 product(intx, ProfileMaturityPercentage, 20, \ 2856 "number of method invocations/branches (expressed as % of " \ 2857 "CompileThreshold) before using the method's profile") \ 2858 \ 2859 develop(bool, PrintMethodData, false, \ 2860 "Print the results of +ProfileInterpreter at end of run") \ 2861 \ 2862 develop(bool, VerifyDataPointer, trueInDebug, \ 2863 "Verify the method data pointer during interpreter profiling") \ 2864 \ 2865 develop(bool, VerifyCompiledCode, false, \ 2866 "Include miscellaneous runtime verifications in nmethod code; " \ 2867 "default off because it disturbs nmethod size heuristics") \ 2868 \ 2869 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2870 "Manually make GC thread crash then dump java stack trace; " \ 2871 "Test only") \ 2872 \ 2873 /* compilation */ \ 2874 product(bool, UseCompiler, true, \ 2875 "Use Just-In-Time compilation") \ 2876 \ 2877 develop(bool, TraceCompilationPolicy, false, \ 2878 "Trace compilation policy") \ 2879 \ 2880 develop(bool, TimeCompilationPolicy, false, \ 2881 "Time the compilation policy") \ 2882 \ 2883 product(bool, UseCounterDecay, true, \ 2884 "Adjust recompilation counters") \ 2885 \ 2886 develop(intx, CounterHalfLifeTime, 30, \ 2887 "Half-life time of invocation counters (in seconds)") \ 2888 \ 2889 develop(intx, CounterDecayMinIntervalLength, 500, \ 2890 "The minimum interval (in milliseconds) between invocation of " \ 2891 "CounterDecay") \ 2892 \ 2893 product(bool, AlwaysCompileLoopMethods, false, \ 2894 "When using recompilation, never interpret methods " \ 2895 "containing loops") \ 2896 \ 2897 product(bool, DontCompileHugeMethods, true, \ 2898 "Do not compile methods > HugeMethodLimit") \ 2899 \ 2900 /* Bytecode escape analysis estimation. */ \ 2901 product(bool, EstimateArgEscape, true, \ 2902 "Analyze bytecodes to estimate escape state of arguments") \ 2903 \ 2904 product(intx, BCEATraceLevel, 0, \ 2905 "How much tracing to do of bytecode escape analysis estimates") \ 2906 \ 2907 product(intx, MaxBCEAEstimateLevel, 5, \ 2908 "Maximum number of nested calls that are analyzed by BC EA") \ 2909 \ 2910 product(intx, MaxBCEAEstimateSize, 150, \ 2911 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2912 \ 2913 product(intx, AllocatePrefetchStyle, 1, \ 2914 "0 = no prefetch, " \ 2915 "1 = prefetch instructions for each allocation, " \ 2916 "2 = use TLAB watermark to gate allocation prefetch, " \ 2917 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2918 \ 2919 product(intx, AllocatePrefetchDistance, -1, \ 2920 "Distance to prefetch ahead of allocation pointer") \ 2921 \ 2922 product(intx, AllocatePrefetchLines, 3, \ 2923 "Number of lines to prefetch ahead of array allocation pointer") \ 2924 \ 2925 product(intx, AllocateInstancePrefetchLines, 1, \ 2926 "Number of lines to prefetch ahead of instance allocation " \ 2927 "pointer") \ 2928 \ 2929 product(intx, AllocatePrefetchStepSize, 16, \ 2930 "Step size in bytes of sequential prefetch instructions") \ 2931 \ 2932 product(intx, AllocatePrefetchInstr, 0, \ 2933 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2934 \ 2935 /* deoptimization */ \ 2936 develop(bool, TraceDeoptimization, false, \ 2937 "Trace deoptimization") \ 2938 \ 2939 develop(bool, DebugDeoptimization, false, \ 2940 "Tracing various information while debugging deoptimization") \ 2941 \ 2942 product(intx, SelfDestructTimer, 0, \ 2943 "Will cause VM to terminate after a given time (in minutes) " \ 2944 "(0 means off)") \ 2945 \ 2946 product(intx, MaxJavaStackTraceDepth, 1024, \ 2947 "The maximum number of lines in the stack trace for Java " \ 2948 "exceptions (0 means all)") \ 2949 \ 2950 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2951 "Guarantee a safepoint (at least) every so many milliseconds " \ 2952 "(0 means none)")) \ 2953 \ 2954 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2955 "Guarantee a safepoint (at least) every so many milliseconds " \ 2956 "(0 means none)")) \ 2957 \ 2958 product(intx, SafepointTimeoutDelay, 10000, \ 2959 "Delay in milliseconds for option SafepointTimeout") \ 2960 \ 2961 product(intx, NmethodSweepFraction, 16, \ 2962 "Number of invocations of sweeper to cover all nmethods") \ 2963 \ 2964 product(intx, NmethodSweepCheckInterval, 5, \ 2965 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2966 \ 2967 product(intx, NmethodSweepActivity, 10, \ 2968 "Removes cold nmethods from code cache if > 0. Higher values " \ 2969 "result in more aggressive sweeping") \ 2970 \ 2971 notproduct(bool, LogSweeper, false, \ 2972 "Keep a ring buffer of sweeper activity") \ 2973 \ 2974 notproduct(intx, SweeperLogEntries, 1024, \ 2975 "Number of records in the ring buffer of sweeper activity") \ 2976 \ 2977 notproduct(intx, MemProfilingInterval, 500, \ 2978 "Time between each invocation of the MemProfiler") \ 2979 \ 2980 develop(intx, MallocCatchPtr, -1, \ 2981 "Hit breakpoint when mallocing/freeing this pointer") \ 2982 \ 2983 notproduct(intx, AssertRepeat, 1, \ 2984 "number of times to evaluate expression in assert " \ 2985 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2986 \ 2987 notproduct(ccstrlist, SuppressErrorAt, "", \ 2988 "List of assertions (file:line) to muzzle") \ 2989 \ 2990 notproduct(uintx, HandleAllocationLimit, 1024, \ 2991 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2992 "is used") \ 2993 \ 2994 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2995 "Threshold for total handle allocation when " \ 2996 "+TraceHandleAllocation is used") \ 2997 \ 2998 develop(intx, StackPrintLimit, 100, \ 2999 "number of stack frames to print in VM-level stack dump") \ 3000 \ 3001 notproduct(intx, MaxElementPrintSize, 256, \ 3002 "maximum number of elements to print") \ 3003 \ 3004 notproduct(intx, MaxSubklassPrintSize, 4, \ 3005 "maximum number of subklasses to print when printing klass") \ 3006 \ 3007 product(intx, MaxInlineLevel, 9, \ 3008 "maximum number of nested calls that are inlined") \ 3009 \ 3010 product(intx, MaxRecursiveInlineLevel, 1, \ 3011 "maximum number of nested recursive calls that are inlined") \ 3012 \ 3013 develop(intx, MaxForceInlineLevel, 100, \ 3014 "maximum number of nested calls that are forced for inlining " \ 3015 "(using CompilerOracle or marked w/ @ForceInline)") \ 3016 \ 3017 product_pd(intx, InlineSmallCode, \ 3018 "Only inline already compiled methods if their code size is " \ 3019 "less than this") \ 3020 \ 3021 product(intx, MaxInlineSize, 35, \ 3022 "The maximum bytecode size of a method to be inlined") \ 3023 \ 3024 product_pd(intx, FreqInlineSize, \ 3025 "The maximum bytecode size of a frequent method to be inlined") \ 3026 \ 3027 product(intx, MaxTrivialSize, 6, \ 3028 "The maximum bytecode size of a trivial method to be inlined") \ 3029 \ 3030 product(intx, MinInliningThreshold, 250, \ 3031 "The minimum invocation count a method needs to have to be " \ 3032 "inlined") \ 3033 \ 3034 develop(intx, MethodHistogramCutoff, 100, \ 3035 "The cutoff value for method invocation histogram (+CountCalls)") \ 3036 \ 3037 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3038 "Number of interpreted methods to show in profile") \ 3039 \ 3040 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3041 "Number of compiled methods to show in profile") \ 3042 \ 3043 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3044 "Number of stub methods to show in profile") \ 3045 \ 3046 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3047 "Number of runtime stub nodes to show in profile") \ 3048 \ 3049 product(intx, ProfileIntervalsTicks, 100, \ 3050 "Number of ticks between printing of interval profile " \ 3051 "(+ProfileIntervals)") \ 3052 \ 3053 notproduct(intx, ScavengeALotInterval, 1, \ 3054 "Interval between which scavenge will occur with +ScavengeALot") \ 3055 \ 3056 notproduct(intx, FullGCALotInterval, 1, \ 3057 "Interval between which full gc will occur with +FullGCALot") \ 3058 \ 3059 notproduct(intx, FullGCALotStart, 0, \ 3060 "For which invocation to start FullGCAlot") \ 3061 \ 3062 notproduct(intx, FullGCALotDummies, 32*K, \ 3063 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3064 "to move") \ 3065 \ 3066 develop(intx, DontYieldALotInterval, 10, \ 3067 "Interval between which yields will be dropped (milliseconds)") \ 3068 \ 3069 develop(intx, MinSleepInterval, 1, \ 3070 "Minimum sleep() interval (milliseconds) when " \ 3071 "ConvertSleepToYield is off (used for Solaris)") \ 3072 \ 3073 develop(intx, ProfilerPCTickThreshold, 15, \ 3074 "Number of ticks in a PC buckets to be a hotspot") \ 3075 \ 3076 notproduct(intx, DeoptimizeALotInterval, 5, \ 3077 "Number of exits until DeoptimizeALot kicks in") \ 3078 \ 3079 notproduct(intx, ZombieALotInterval, 5, \ 3080 "Number of exits until ZombieALot kicks in") \ 3081 \ 3082 diagnostic(intx, MallocVerifyInterval, 0, \ 3083 "If non-zero, verify C heap after every N calls to " \ 3084 "malloc/realloc/free") \ 3085 \ 3086 diagnostic(intx, MallocVerifyStart, 0, \ 3087 "If non-zero, start verifying C heap after Nth call to " \ 3088 "malloc/realloc/free") \ 3089 \ 3090 diagnostic(uintx, MallocMaxTestWords, 0, \ 3091 "If non-zero, maximum number of words that malloc/realloc can " \ 3092 "allocate (for testing only)") \ 3093 \ 3094 product(intx, TypeProfileWidth, 2, \ 3095 "Number of receiver types to record in call/cast profile") \ 3096 \ 3097 develop(intx, BciProfileWidth, 2, \ 3098 "Number of return bci's to record in ret profile") \ 3099 \ 3100 product(intx, PerMethodRecompilationCutoff, 400, \ 3101 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3102 \ 3103 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3104 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3105 \ 3106 product(intx, PerMethodTrapLimit, 100, \ 3107 "Limit on traps (of one kind) in a method (includes inlines)") \ 3108 \ 3109 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3110 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3111 \ 3112 product(intx, PerBytecodeTrapLimit, 4, \ 3113 "Limit on traps (of one kind) at a particular BCI") \ 3114 \ 3115 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3116 "Extra method data trap entries for speculation") \ 3117 \ 3118 develop(intx, InlineFrequencyRatio, 20, \ 3119 "Ratio of call site execution to caller method invocation") \ 3120 \ 3121 develop_pd(intx, InlineFrequencyCount, \ 3122 "Count of call site execution necessary to trigger frequent " \ 3123 "inlining") \ 3124 \ 3125 develop(intx, InlineThrowCount, 50, \ 3126 "Force inlining of interpreted methods that throw this often") \ 3127 \ 3128 develop(intx, InlineThrowMaxSize, 200, \ 3129 "Force inlining of throwing methods smaller than this") \ 3130 \ 3131 develop(intx, ProfilerNodeSize, 1024, \ 3132 "Size in K to allocate for the Profile Nodes of each thread") \ 3133 \ 3134 product_pd(intx, PreInflateSpin, \ 3135 "Number of times to spin wait before inflation") \ 3136 \ 3137 /* gc parameters */ \ 3138 product(uintx, InitialHeapSize, 0, \ 3139 "Initial heap size (in bytes); zero means use ergonomics") \ 3140 \ 3141 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3142 "Maximum heap size (in bytes)") \ 3143 \ 3144 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3145 "Initial tenured generation size (in bytes)") \ 3146 \ 3147 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3148 "Initial new generation size (in bytes)") \ 3149 \ 3150 product(uintx, MaxNewSize, max_uintx, \ 3151 "Maximum new generation size (in bytes), max_uintx means set " \ 3152 "ergonomically") \ 3153 \ 3154 product(uintx, PretenureSizeThreshold, 0, \ 3155 "Maximum size in bytes of objects allocated in DefNew " \ 3156 "generation; zero means no maximum") \ 3157 \ 3158 product(uintx, TLABSize, 0, \ 3159 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3160 \ 3161 product(uintx, MinTLABSize, 2*K, \ 3162 "Minimum allowed TLAB size (in bytes)") \ 3163 \ 3164 product(uintx, TLABAllocationWeight, 35, \ 3165 "Allocation averaging weight") \ 3166 \ 3167 product(uintx, TLABWasteTargetPercent, 1, \ 3168 "Percentage of Eden that can be wasted") \ 3169 \ 3170 product(uintx, TLABRefillWasteFraction, 64, \ 3171 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3172 \ 3173 product(uintx, TLABWasteIncrement, 4, \ 3174 "Increment allowed waste at slow allocation") \ 3175 \ 3176 product(uintx, SurvivorRatio, 8, \ 3177 "Ratio of eden/survivor space size") \ 3178 \ 3179 product(uintx, NewRatio, 2, \ 3180 "Ratio of old/new generation sizes") \ 3181 \ 3182 product_pd(uintx, NewSizeThreadIncrease, \ 3183 "Additional size added to desired new generation size per " \ 3184 "non-daemon thread (in bytes)") \ 3185 \ 3186 product_pd(uintx, MetaspaceSize, \ 3187 "Initial size of Metaspaces (in bytes)") \ 3188 \ 3189 product(uintx, MaxMetaspaceSize, max_uintx, \ 3190 "Maximum size of Metaspaces (in bytes)") \ 3191 \ 3192 product(uintx, CompressedClassSpaceSize, 1*G, \ 3193 "Maximum size of class area in Metaspace when compressed " \ 3194 "class pointers are used") \ 3195 \ 3196 manageable(uintx, MinHeapFreeRatio, 40, \ 3197 "The minimum percentage of heap free after GC to avoid expansion."\ 3198 " For most GCs this applies to the old generation. In G1 and" \ 3199 " ParallelGC it applies to the whole heap.") \ 3200 \ 3201 manageable(uintx, MaxHeapFreeRatio, 70, \ 3202 "The maximum percentage of heap free after GC to avoid shrinking."\ 3203 " For most GCs this applies to the old generation. In G1 and" \ 3204 " ParallelGC it applies to the whole heap.") \ 3205 \ 3206 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3207 "Number of milliseconds per MB of free space in the heap") \ 3208 \ 3209 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3210 "The minimum change in heap space due to GC (in bytes)") \ 3211 \ 3212 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3213 "The minimum expansion of Metaspace (in bytes)") \ 3214 \ 3215 product(uintx, MinMetaspaceFreeRatio, 40, \ 3216 "The minimum percentage of Metaspace free after GC to avoid " \ 3217 "expansion") \ 3218 \ 3219 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3220 "The maximum percentage of Metaspace free after GC to avoid " \ 3221 "shrinking") \ 3222 \ 3223 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3224 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3225 \ 3226 product(uintx, QueuedAllocationWarningCount, 0, \ 3227 "Number of times an allocation that queues behind a GC " \ 3228 "will retry before printing a warning") \ 3229 \ 3230 diagnostic(uintx, VerifyGCStartAt, 0, \ 3231 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3232 \ 3233 diagnostic(intx, VerifyGCLevel, 0, \ 3234 "Generation level at which to start +VerifyBefore/AfterGC") \ 3235 \ 3236 product(uintx, MaxTenuringThreshold, 15, \ 3237 "Maximum value for tenuring threshold") \ 3238 \ 3239 product(uintx, InitialTenuringThreshold, 7, \ 3240 "Initial value for tenuring threshold") \ 3241 \ 3242 product(uintx, TargetSurvivorRatio, 50, \ 3243 "Desired percentage of survivor space used after scavenge") \ 3244 \ 3245 product(uintx, MarkSweepDeadRatio, 5, \ 3246 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3247 "Serial mark sweep treats this as both the minimum and maximum " \ 3248 "value. " \ 3249 "CMS uses this value only if it falls back to mark sweep. " \ 3250 "Par compact uses a variable scale based on the density of the " \ 3251 "generation and treats this as the maximum value when the heap " \ 3252 "is either completely full or completely empty. Par compact " \ 3253 "also has a smaller default value; see arguments.cpp.") \ 3254 \ 3255 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3256 "How often should we fully compact the heap (ignoring the dead " \ 3257 "space parameters)") \ 3258 \ 3259 product(intx, PrintCMSStatistics, 0, \ 3260 "Statistics for CMS") \ 3261 \ 3262 product(bool, PrintCMSInitiationStatistics, false, \ 3263 "Statistics for initiating a CMS collection") \ 3264 \ 3265 product(intx, PrintFLSStatistics, 0, \ 3266 "Statistics for CMS' FreeListSpace") \ 3267 \ 3268 product(intx, PrintFLSCensus, 0, \ 3269 "Census for CMS' FreeListSpace") \ 3270 \ 3271 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3272 "Delay between expansion and allocation (in milliseconds)") \ 3273 \ 3274 develop(uintx, GCWorkerDelayMillis, 0, \ 3275 "Delay in scheduling GC workers (in milliseconds)") \ 3276 \ 3277 product(intx, DeferThrSuspendLoopCount, 4000, \ 3278 "(Unstable) Number of times to iterate in safepoint loop " \ 3279 "before blocking VM threads ") \ 3280 \ 3281 product(intx, DeferPollingPageLoopCount, -1, \ 3282 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3283 "before changing safepoint polling page to RO ") \ 3284 \ 3285 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3286 \ 3287 product(bool, PSChunkLargeArrays, true, \ 3288 "Process large arrays in chunks") \ 3289 \ 3290 product(uintx, GCDrainStackTargetSize, 64, \ 3291 "Number of entries we will try to leave on the stack " \ 3292 "during parallel gc") \ 3293 \ 3294 /* stack parameters */ \ 3295 product_pd(intx, StackYellowPages, \ 3296 "Number of yellow zone (recoverable overflows) pages") \ 3297 \ 3298 product_pd(intx, StackRedPages, \ 3299 "Number of red zone (unrecoverable overflows) pages") \ 3300 \ 3301 product_pd(intx, StackShadowPages, \ 3302 "Number of shadow zone (for overflow checking) pages " \ 3303 "this should exceed the depth of the VM and native call stack") \ 3304 \ 3305 product_pd(intx, ThreadStackSize, \ 3306 "Thread Stack Size (in Kbytes)") \ 3307 \ 3308 product_pd(intx, VMThreadStackSize, \ 3309 "Non-Java Thread Stack Size (in Kbytes)") \ 3310 \ 3311 product_pd(intx, CompilerThreadStackSize, \ 3312 "Compiler Thread Stack Size (in Kbytes)") \ 3313 \ 3314 develop_pd(uintx, JVMInvokeMethodSlack, \ 3315 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3316 \ 3317 product(uintx, ThreadSafetyMargin, 50*M, \ 3318 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3319 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3320 "disable this feature") \ 3321 \ 3322 /* code cache parameters */ \ 3323 /* ppc64 has large code-entry alignment. */ \ 3324 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \ 3325 "Code cache segment size (in bytes) - smallest unit of " \ 3326 "allocation") \ 3327 \ 3328 develop_pd(intx, CodeEntryAlignment, \ 3329 "Code entry alignment for generated code (in bytes)") \ 3330 \ 3331 product_pd(intx, OptoLoopAlignment, \ 3332 "Align inner loops to zero relative to this modulus") \ 3333 \ 3334 product_pd(uintx, InitialCodeCacheSize, \ 3335 "Initial code cache size (in bytes)") \ 3336 \ 3337 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3338 "Minimum code cache size (in bytes) required to start VM.") \ 3339 \ 3340 product_pd(uintx, ReservedCodeCacheSize, \ 3341 "Reserved code cache size (in bytes) - maximum code cache size") \ 3342 \ 3343 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3344 "When less than X space left, we stop compiling") \ 3345 \ 3346 product_pd(uintx, CodeCacheExpansionSize, \ 3347 "Code cache expansion size (in bytes)") \ 3348 \ 3349 develop_pd(uintx, CodeCacheMinBlockLength, \ 3350 "Minimum number of segments in a code cache block") \ 3351 \ 3352 notproduct(bool, ExitOnFullCodeCache, false, \ 3353 "Exit the VM if we fill the code cache") \ 3354 \ 3355 product(bool, UseCodeCacheFlushing, true, \ 3356 "Remove cold/old nmethods from the code cache") \ 3357 \ 3358 /* interpreter debugging */ \ 3359 develop(intx, BinarySwitchThreshold, 5, \ 3360 "Minimal number of lookupswitch entries for rewriting to binary " \ 3361 "switch") \ 3362 \ 3363 develop(intx, StopInterpreterAt, 0, \ 3364 "Stop interpreter execution at specified bytecode number") \ 3365 \ 3366 develop(intx, TraceBytecodesAt, 0, \ 3367 "Trace bytecodes starting with specified bytecode number") \ 3368 \ 3369 /* compiler interface */ \ 3370 develop(intx, CIStart, 0, \ 3371 "The id of the first compilation to permit") \ 3372 \ 3373 develop(intx, CIStop, max_jint, \ 3374 "The id of the last compilation to permit") \ 3375 \ 3376 develop(intx, CIStartOSR, 0, \ 3377 "The id of the first osr compilation to permit " \ 3378 "(CICountOSR must be on)") \ 3379 \ 3380 develop(intx, CIStopOSR, max_jint, \ 3381 "The id of the last osr compilation to permit " \ 3382 "(CICountOSR must be on)") \ 3383 \ 3384 develop(intx, CIBreakAtOSR, -1, \ 3385 "The id of osr compilation to break at") \ 3386 \ 3387 develop(intx, CIBreakAt, -1, \ 3388 "The id of compilation to break at") \ 3389 \ 3390 product(ccstrlist, CompileOnly, "", \ 3391 "List of methods (pkg/class.name) to restrict compilation to") \ 3392 \ 3393 product(ccstr, CompileCommandFile, NULL, \ 3394 "Read compiler commands from this file [.hotspot_compiler]") \ 3395 \ 3396 product(ccstrlist, CompileCommand, "", \ 3397 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3398 \ 3399 develop(bool, ReplayCompiles, false, \ 3400 "Enable replay of compilations from ReplayDataFile") \ 3401 \ 3402 product(ccstr, ReplayDataFile, NULL, \ 3403 "File containing compilation replay information" \ 3404 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3405 \ 3406 product(ccstr, InlineDataFile, NULL, \ 3407 "File containing inlining replay information" \ 3408 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3409 \ 3410 develop(intx, ReplaySuppressInitializers, 2, \ 3411 "Control handling of class initialization during replay: " \ 3412 "0 - don't do anything special; " \ 3413 "1 - treat all class initializers as empty; " \ 3414 "2 - treat class initializers for application classes as empty; " \ 3415 "3 - allow all class initializers to run during bootstrap but " \ 3416 " pretend they are empty after starting replay") \ 3417 \ 3418 develop(bool, ReplayIgnoreInitErrors, false, \ 3419 "Ignore exceptions thrown during initialization for replay") \ 3420 \ 3421 product(bool, DumpReplayDataOnError, true, \ 3422 "Record replay data for crashing compiler threads") \ 3423 \ 3424 product(bool, CICompilerCountPerCPU, false, \ 3425 "1 compiler thread for log(N CPUs)") \ 3426 \ 3427 develop(intx, CIFireOOMAt, -1, \ 3428 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3429 "(non-negative value throws OOM after this many CI accesses " \ 3430 "in each compile)") \ 3431 notproduct(intx, CICrashAt, -1, \ 3432 "id of compilation to trigger assert in compiler thread for " \ 3433 "the purpose of testing, e.g. generation of replay data") \ 3434 notproduct(bool, CIObjectFactoryVerify, false, \ 3435 "enable potentially expensive verification in ciObjectFactory") \ 3436 \ 3437 /* Priorities */ \ 3438 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3439 \ 3440 product(intx, ThreadPriorityPolicy, 0, \ 3441 "0 : Normal. "\ 3442 " VM chooses priorities that are appropriate for normal "\ 3443 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3444 " to normal native priority. Java priorities below " \ 3445 " NORM_PRIORITY map to lower native priority values. On "\ 3446 " Windows applications are allowed to use higher native "\ 3447 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3448 " not use the highest possible native priority, "\ 3449 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3450 " system threads. On Linux thread priorities are ignored "\ 3451 " because the OS does not support static priority in "\ 3452 " SCHED_OTHER scheduling class which is the only choice for "\ 3453 " non-root, non-realtime applications. "\ 3454 "1 : Aggressive. "\ 3455 " Java thread priorities map over to the entire range of "\ 3456 " native thread priorities. Higher Java thread priorities map "\ 3457 " to higher native thread priorities. This policy should be "\ 3458 " used with care, as sometimes it can cause performance "\ 3459 " degradation in the application and/or the entire system. On "\ 3460 " Linux this policy requires root privilege.") \ 3461 \ 3462 product(bool, ThreadPriorityVerbose, false, \ 3463 "Print priority changes") \ 3464 \ 3465 product(intx, DefaultThreadPriority, -1, \ 3466 "The native priority at which threads run if not elsewhere " \ 3467 "specified (-1 means no change)") \ 3468 \ 3469 product(intx, CompilerThreadPriority, -1, \ 3470 "The native priority at which compiler threads should run " \ 3471 "(-1 means no change)") \ 3472 \ 3473 product(intx, VMThreadPriority, -1, \ 3474 "The native priority at which the VM thread should run " \ 3475 "(-1 means no change)") \ 3476 \ 3477 product(bool, CompilerThreadHintNoPreempt, true, \ 3478 "(Solaris only) Give compiler threads an extra quanta") \ 3479 \ 3480 product(bool, VMThreadHintNoPreempt, false, \ 3481 "(Solaris only) Give VM thread an extra quanta") \ 3482 \ 3483 product(intx, JavaPriority1_To_OSPriority, -1, \ 3484 "Map Java priorities to OS priorities") \ 3485 \ 3486 product(intx, JavaPriority2_To_OSPriority, -1, \ 3487 "Map Java priorities to OS priorities") \ 3488 \ 3489 product(intx, JavaPriority3_To_OSPriority, -1, \ 3490 "Map Java priorities to OS priorities") \ 3491 \ 3492 product(intx, JavaPriority4_To_OSPriority, -1, \ 3493 "Map Java priorities to OS priorities") \ 3494 \ 3495 product(intx, JavaPriority5_To_OSPriority, -1, \ 3496 "Map Java priorities to OS priorities") \ 3497 \ 3498 product(intx, JavaPriority6_To_OSPriority, -1, \ 3499 "Map Java priorities to OS priorities") \ 3500 \ 3501 product(intx, JavaPriority7_To_OSPriority, -1, \ 3502 "Map Java priorities to OS priorities") \ 3503 \ 3504 product(intx, JavaPriority8_To_OSPriority, -1, \ 3505 "Map Java priorities to OS priorities") \ 3506 \ 3507 product(intx, JavaPriority9_To_OSPriority, -1, \ 3508 "Map Java priorities to OS priorities") \ 3509 \ 3510 product(intx, JavaPriority10_To_OSPriority,-1, \ 3511 "Map Java priorities to OS priorities") \ 3512 \ 3513 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3514 "Java thread priority 10 maps to critical scheduling priority") \ 3515 \ 3516 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3517 "Compiler thread(s) run at critical scheduling priority") \ 3518 \ 3519 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3520 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3521 \ 3522 /* compiler debugging */ \ 3523 notproduct(intx, CompileTheWorldStartAt, 1, \ 3524 "First class to consider when using +CompileTheWorld") \ 3525 \ 3526 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3527 "Last class to consider when using +CompileTheWorld") \ 3528 \ 3529 develop(intx, NewCodeParameter, 0, \ 3530 "Testing Only: Create a dedicated integer parameter before " \ 3531 "putback") \ 3532 \ 3533 /* new oopmap storage allocation */ \ 3534 develop(intx, MinOopMapAllocation, 8, \ 3535 "Minimum number of OopMap entries in an OopMapSet") \ 3536 \ 3537 /* Background Compilation */ \ 3538 develop(intx, LongCompileThreshold, 50, \ 3539 "Used with +TraceLongCompiles") \ 3540 \ 3541 product(intx, StarvationMonitorInterval, 200, \ 3542 "Pause between each check (in milliseconds)") \ 3543 \ 3544 /* recompilation */ \ 3545 product_pd(intx, CompileThreshold, \ 3546 "number of interpreted method invocations before (re-)compiling") \ 3547 \ 3548 product_pd(intx, BackEdgeThreshold, \ 3549 "Interpreter Back edge threshold at which an OSR compilation is " \ 3550 "invoked") \ 3551 \ 3552 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3553 "Interpreter (tier 0) invocation notification frequency") \ 3554 \ 3555 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3556 "C1 without MDO (tier 2) invocation notification frequency") \ 3557 \ 3558 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3559 "C1 with MDO profiling (tier 3) invocation notification " \ 3560 "frequency") \ 3561 \ 3562 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3563 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3564 \ 3565 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3566 "Interpreter (tier 0) invocation notification frequency") \ 3567 \ 3568 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3569 "C1 without MDO (tier 2) invocation notification frequency") \ 3570 \ 3571 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3572 "C1 with MDO profiling (tier 3) invocation notification " \ 3573 "frequency") \ 3574 \ 3575 product(intx, Tier2CompileThreshold, 0, \ 3576 "threshold at which tier 2 compilation is invoked") \ 3577 \ 3578 product(intx, Tier2BackEdgeThreshold, 0, \ 3579 "Back edge threshold at which tier 2 compilation is invoked") \ 3580 \ 3581 product(intx, Tier3InvocationThreshold, 200, \ 3582 "Compile if number of method invocations crosses this " \ 3583 "threshold") \ 3584 \ 3585 product(intx, Tier3MinInvocationThreshold, 100, \ 3586 "Minimum invocation to compile at tier 3") \ 3587 \ 3588 product(intx, Tier3CompileThreshold, 2000, \ 3589 "Threshold at which tier 3 compilation is invoked (invocation " \ 3590 "minimum must be satisfied") \ 3591 \ 3592 product(intx, Tier3BackEdgeThreshold, 60000, \ 3593 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3594 \ 3595 product(intx, Tier4InvocationThreshold, 5000, \ 3596 "Compile if number of method invocations crosses this " \ 3597 "threshold") \ 3598 \ 3599 product(intx, Tier4MinInvocationThreshold, 600, \ 3600 "Minimum invocation to compile at tier 4") \ 3601 \ 3602 product(intx, Tier4CompileThreshold, 15000, \ 3603 "Threshold at which tier 4 compilation is invoked (invocation " \ 3604 "minimum must be satisfied") \ 3605 \ 3606 product(intx, Tier4BackEdgeThreshold, 40000, \ 3607 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3608 \ 3609 product(intx, Tier3DelayOn, 5, \ 3610 "If C2 queue size grows over this amount per compiler thread " \ 3611 "stop compiling at tier 3 and start compiling at tier 2") \ 3612 \ 3613 product(intx, Tier3DelayOff, 2, \ 3614 "If C2 queue size is less than this amount per compiler thread " \ 3615 "allow methods compiled at tier 2 transition to tier 3") \ 3616 \ 3617 product(intx, Tier3LoadFeedback, 5, \ 3618 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3619 "reaches this amount per compiler thread") \ 3620 \ 3621 product(intx, Tier4LoadFeedback, 3, \ 3622 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3623 "reaches this amount per compiler thread") \ 3624 \ 3625 product(intx, TieredCompileTaskTimeout, 50, \ 3626 "Kill compile task if method was not used within " \ 3627 "given timeout in milliseconds") \ 3628 \ 3629 product(intx, TieredStopAtLevel, 4, \ 3630 "Stop at given compilation level") \ 3631 \ 3632 product(intx, Tier0ProfilingStartPercentage, 200, \ 3633 "Start profiling in interpreter if the counters exceed tier 3 " \ 3634 "thresholds by the specified percentage") \ 3635 \ 3636 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3637 "Increase the compile threshold for C1 compilation if the code " \ 3638 "cache is filled by the specified percentage") \ 3639 \ 3640 product(intx, TieredRateUpdateMinTime, 1, \ 3641 "Minimum rate sampling interval (in milliseconds)") \ 3642 \ 3643 product(intx, TieredRateUpdateMaxTime, 25, \ 3644 "Maximum rate sampling interval (in milliseconds)") \ 3645 \ 3646 product_pd(bool, TieredCompilation, \ 3647 "Enable tiered compilation") \ 3648 \ 3649 product(bool, PrintTieredEvents, false, \ 3650 "Print tiered events notifications") \ 3651 \ 3652 product_pd(intx, OnStackReplacePercentage, \ 3653 "NON_TIERED number of method invocations/branches (expressed as " \ 3654 "% of CompileThreshold) before (re-)compiling OSR code") \ 3655 \ 3656 product(intx, InterpreterProfilePercentage, 33, \ 3657 "NON_TIERED number of method invocations/branches (expressed as " \ 3658 "% of CompileThreshold) before profiling in the interpreter") \ 3659 \ 3660 develop(intx, MaxRecompilationSearchLength, 10, \ 3661 "The maximum number of frames to inspect when searching for " \ 3662 "recompilee") \ 3663 \ 3664 develop(intx, MaxInterpretedSearchLength, 3, \ 3665 "The maximum number of interpreted frames to skip when searching "\ 3666 "for recompilee") \ 3667 \ 3668 develop(intx, DesiredMethodLimit, 8000, \ 3669 "The desired maximum method size (in bytecodes) after inlining") \ 3670 \ 3671 develop(intx, HugeMethodLimit, 8000, \ 3672 "Don't compile methods larger than this if " \ 3673 "+DontCompileHugeMethods") \ 3674 \ 3675 /* New JDK 1.4 reflection implementation */ \ 3676 \ 3677 develop(bool, UseNewReflection, true, \ 3678 "Temporary flag for transition to reflection based on dynamic " \ 3679 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3680 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3681 "changes were needed") \ 3682 \ 3683 develop(bool, VerifyReflectionBytecodes, false, \ 3684 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3685 "in situations like that described in 4486457 or for " \ 3686 "constructors generated for serialization, so can not be enabled "\ 3687 "in product.") \ 3688 \ 3689 product(bool, ReflectionWrapResolutionErrors, true, \ 3690 "Temporary flag for transition to AbstractMethodError wrapped " \ 3691 "in InvocationTargetException. See 6531596") \ 3692 \ 3693 develop(intx, FastSuperclassLimit, 8, \ 3694 "Depth of hardwired instanceof accelerator array") \ 3695 \ 3696 /* Properties for Java libraries */ \ 3697 \ 3698 product(uintx, MaxDirectMemorySize, 0, \ 3699 "Maximum total size of NIO direct-buffer allocations") \ 3700 \ 3701 /* temporary developer defined flags */ \ 3702 \ 3703 diagnostic(bool, UseNewCode, false, \ 3704 "Testing Only: Use the new version while testing") \ 3705 \ 3706 diagnostic(bool, UseNewCode2, false, \ 3707 "Testing Only: Use the new version while testing") \ 3708 \ 3709 diagnostic(bool, UseNewCode3, false, \ 3710 "Testing Only: Use the new version while testing") \ 3711 \ 3712 /* flags for performance data collection */ \ 3713 \ 3714 product(bool, UsePerfData, falseInEmbedded, \ 3715 "Flag to disable jvmstat instrumentation for performance testing "\ 3716 "and problem isolation purposes") \ 3717 \ 3718 product(bool, PerfDataSaveToFile, false, \ 3719 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3720 \ 3721 product(ccstr, PerfDataSaveFile, NULL, \ 3722 "Save PerfData memory to the specified absolute pathname. " \ 3723 "The string %p in the file name (if present) " \ 3724 "will be replaced by pid") \ 3725 \ 3726 product(intx, PerfDataSamplingInterval, 50, \ 3727 "Data sampling interval (in milliseconds)") \ 3728 \ 3729 develop(bool, PerfTraceDataCreation, false, \ 3730 "Trace creation of Performance Data Entries") \ 3731 \ 3732 develop(bool, PerfTraceMemOps, false, \ 3733 "Trace PerfMemory create/attach/detach calls") \ 3734 \ 3735 product(bool, PerfDisableSharedMem, false, \ 3736 "Store performance data in standard memory") \ 3737 \ 3738 product(intx, PerfDataMemorySize, 32*K, \ 3739 "Size of performance data memory region. Will be rounded " \ 3740 "up to a multiple of the native os page size.") \ 3741 \ 3742 product(intx, PerfMaxStringConstLength, 1024, \ 3743 "Maximum PerfStringConstant string length before truncation") \ 3744 \ 3745 product(bool, PerfAllowAtExitRegistration, false, \ 3746 "Allow registration of atexit() methods") \ 3747 \ 3748 product(bool, PerfBypassFileSystemCheck, false, \ 3749 "Bypass Win32 file system criteria checks (Windows Only)") \ 3750 \ 3751 product(intx, UnguardOnExecutionViolation, 0, \ 3752 "Unguard page and retry on no-execute fault (Win32 only) " \ 3753 "0=off, 1=conservative, 2=aggressive") \ 3754 \ 3755 /* Serviceability Support */ \ 3756 \ 3757 product(bool, ManagementServer, false, \ 3758 "Create JMX Management Server") \ 3759 \ 3760 product(bool, DisableAttachMechanism, false, \ 3761 "Disable mechanism that allows tools to attach to this VM") \ 3762 \ 3763 product(bool, StartAttachListener, false, \ 3764 "Always start Attach Listener at VM startup") \ 3765 \ 3766 manageable(bool, PrintConcurrentLocks, false, \ 3767 "Print java.util.concurrent locks in thread dump") \ 3768 \ 3769 product(bool, TransmitErrorReport, false, \ 3770 "Enable error report transmission on erroneous termination") \ 3771 \ 3772 product(ccstr, ErrorReportServer, NULL, \ 3773 "Override built-in error report server address") \ 3774 \ 3775 /* Shared spaces */ \ 3776 \ 3777 product(bool, UseSharedSpaces, true, \ 3778 "Use shared spaces for metadata") \ 3779 \ 3780 product(bool, VerifySharedSpaces, false, \ 3781 "Verify shared spaces (false for default archive, true for " \ 3782 "archive specified by -XX:SharedArchiveFile)") \ 3783 \ 3784 product(bool, RequireSharedSpaces, false, \ 3785 "Require shared spaces for metadata") \ 3786 \ 3787 product(bool, DumpSharedSpaces, false, \ 3788 "Special mode: JVM reads a class list, loads classes, builds " \ 3789 "shared spaces, and dumps the shared spaces to a file to be " \ 3790 "used in future JVM runs") \ 3791 \ 3792 product(bool, PrintSharedSpaces, false, \ 3793 "Print usage of shared spaces") \ 3794 \ 3795 product(bool, PrintSharedArchiveAndExit, false, \ 3796 "Print shared archive file contents") \ 3797 \ 3798 product(bool, PrintSharedDictionary, false, \ 3799 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3800 "dictionary") \ 3801 \ 3802 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3803 "Size of read-write space for metadata (in bytes)") \ 3804 \ 3805 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3806 "Size of read-only space for metadata (in bytes)") \ 3807 \ 3808 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3809 "Size of the shared miscellaneous data area (in bytes)") \ 3810 \ 3811 product(uintx, SharedMiscCodeSize, 120*K, \ 3812 "Size of the shared miscellaneous code area (in bytes)") \ 3813 \ 3814 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3815 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3816 "Address to allocate shared memory region for class data") \ 3817 \ 3818 diagnostic(bool, EnableInvokeDynamic, true, \ 3819 "support JSR 292 (method handles, invokedynamic, " \ 3820 "anonymous classes") \ 3821 \ 3822 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3823 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3824 "classes. Just exclude them from the shared dictionary.") \ 3825 \ 3826 diagnostic(bool, PrintMethodHandleStubs, false, \ 3827 "Print generated stub code for method handles") \ 3828 \ 3829 develop(bool, TraceMethodHandles, false, \ 3830 "trace internal method handle operations") \ 3831 \ 3832 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3833 "perform extra checks when constructing method handles") \ 3834 \ 3835 diagnostic(bool, ShowHiddenFrames, false, \ 3836 "show method handle implementation frames (usually hidden)") \ 3837 \ 3838 experimental(bool, TrustFinalNonStaticFields, false, \ 3839 "trust final non-static declarations for constant folding") \ 3840 \ 3841 diagnostic(bool, FoldStableValues, true, \ 3842 "Optimize loads from stable fields (marked w/ @Stable)") \ 3843 \ 3844 develop(bool, TraceInvokeDynamic, false, \ 3845 "trace internal invoke dynamic operations") \ 3846 \ 3847 diagnostic(bool, PauseAtStartup, false, \ 3848 "Causes the VM to pause at startup time and wait for the pause " \ 3849 "file to be removed (default: ./vm.paused.<pid>)") \ 3850 \ 3851 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3852 "The file to create and for whose removal to await when pausing " \ 3853 "at startup. (default: ./vm.paused.<pid>)") \ 3854 \ 3855 diagnostic(bool, PauseAtExit, false, \ 3856 "Pause and wait for keypress on exit if a debugger is attached") \ 3857 \ 3858 product(bool, ExtendedDTraceProbes, false, \ 3859 "Enable performance-impacting dtrace probes") \ 3860 \ 3861 product(bool, DTraceMethodProbes, false, \ 3862 "Enable dtrace probes for method-entry and method-exit") \ 3863 \ 3864 product(bool, DTraceAllocProbes, false, \ 3865 "Enable dtrace probes for object allocation") \ 3866 \ 3867 product(bool, DTraceMonitorProbes, false, \ 3868 "Enable dtrace probes for monitor events") \ 3869 \ 3870 product(bool, RelaxAccessControlCheck, false, \ 3871 "Relax the access control checks in the verifier") \ 3872 \ 3873 diagnostic(bool, PrintDTraceDOF, false, \ 3874 "Print the DTrace DOF passed to the system for JSDT probes") \ 3875 \ 3876 product(uintx, StringTableSize, defaultStringTableSize, \ 3877 "Number of buckets in the interned String table") \ 3878 \ 3879 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3880 "Number of buckets in the JVM internal Symbol table") \ 3881 \ 3882 product(bool, UseStringDeduplication, false, \ 3883 "Use string deduplication") \ 3884 \ 3885 product(bool, PrintStringDeduplicationStatistics, false, \ 3886 "Print string deduplication statistics") \ 3887 \ 3888 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3889 "A string must reach this age (or be promoted to an old region) " \ 3890 "to be considered for deduplication") \ 3891 \ 3892 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3893 "Force table resize every time the table is scanned") \ 3894 \ 3895 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3896 "Force table rehash every time the table is scanned") \ 3897 \ 3898 develop(bool, TraceDefaultMethods, false, \ 3899 "Trace the default method processing steps") \ 3900 \ 3901 develop(bool, VerifyGenericSignatures, false, \ 3902 "Abort VM on erroneous or inconsistent generic signatures") \ 3903 \ 3904 product(bool, UseVMInterruptibleIO, false, \ 3905 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3906 "EINTR for I/O operations results in OS_INTRPT. The default " \ 3907 "value of this flag is true for JDK 6 and earlier") \ 3908 \ 3909 diagnostic(bool, WhiteBoxAPI, false, \ 3910 "Enable internal testing APIs") \ 3911 \ 3912 product(bool, PrintGCCause, true, \ 3913 "Include GC cause in GC logging") \ 3914 \ 3915 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3916 "Default survivor space alignment in bytes") \ 3917 \ 3918 product(bool , AllowNonVirtualCalls, false, \ 3919 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3920 \ 3921 product(ccstr, DumpLoadedClassList, NULL, \ 3922 "Dump the names all loaded classes, that could be stored into " \ 3923 "the CDS archive, in the specified file") \ 3924 \ 3925 product(ccstr, SharedClassListFile, NULL, \ 3926 "Override the default CDS class list") \ 3927 \ 3928 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3929 "Override the default location of the CDS archive file") \ 3930 \ 3931 product(ccstr, ExtraSharedClassListFile, NULL, \ 3932 "Extra classlist for building the CDS archive file") \ 3933 \ 3934 experimental(uintx, ArrayAllocatorMallocLimit, \ 3935 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3936 "Allocation less than this value will be allocated " \ 3937 "using malloc. Larger allocations will use mmap.") \ 3938 \ 3939 product(bool, EnableTracing, false, \ 3940 "Enable event-based tracing") \ 3941 \ 3942 product(bool, UseLockedTracing, false, \ 3943 "Use locked-tracing when doing event-based tracing") \ 3944 \ 3945 product_pd(bool, PreserveFramePointer, \ 3946 "Use the FP register for holding the frame pointer " \ 3947 "and not as a general purpose register.") 3948 3949 /* 3950 * Macros for factoring of globals 3951 */ 3952 3953 // Interface macros 3954 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3955 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3956 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3957 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3958 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3959 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3960 #ifdef PRODUCT 3961 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3962 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3963 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3964 #else 3965 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3966 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3967 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3968 #endif 3969 // Special LP64 flags, product only needed for now. 3970 #ifdef _LP64 3971 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3972 #else 3973 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3974 #endif // _LP64 3975 3976 // Implementation macros 3977 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3978 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3979 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3980 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3981 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3982 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3983 #ifdef PRODUCT 3984 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3985 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3986 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3987 #else 3988 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3989 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3990 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3991 #endif 3992 #ifdef _LP64 3993 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3994 #else 3995 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3996 #endif // _LP64 3997 3998 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) 3999 4000 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4001 4002 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4003 4004 // Extensions 4005 4006 #include "runtime/globals_ext.hpp" 4007 4008 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP