1 /* 2 * Copyright (c) 1997, 2018, 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(bool, UseGHASHIntrinsics, false, \ 606 "Use intrinsics for GHASH versions of crypto") \ 607 \ 608 product(uintx, LargePageSizeInBytes, 0, \ 609 "Large page size (0 to let VM choose the page size)") \ 610 \ 611 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 612 "Use large pages if maximum heap is at least this big") \ 613 \ 614 product(bool, ForceTimeHighResolution, false, \ 615 "Using high time resolution (for Win32 only)") \ 616 \ 617 develop(bool, TraceItables, false, \ 618 "Trace initialization and use of itables") \ 619 \ 620 develop(bool, TracePcPatching, false, \ 621 "Trace usage of frame::patch_pc") \ 622 \ 623 develop(bool, TraceJumps, false, \ 624 "Trace assembly jumps in thread ring buffer") \ 625 \ 626 develop(bool, TraceRelocator, false, \ 627 "Trace the bytecode relocator") \ 628 \ 629 develop(bool, TraceLongCompiles, false, \ 630 "Print out every time compilation is longer than " \ 631 "a given threshold") \ 632 \ 633 develop(bool, SafepointALot, false, \ 634 "Generate a lot of safepoints. This works with " \ 635 "GuaranteedSafepointInterval") \ 636 \ 637 product_pd(bool, BackgroundCompilation, \ 638 "A thread requesting compilation is not blocked during " \ 639 "compilation") \ 640 \ 641 product(bool, PrintVMQWaitTime, false, \ 642 "Print out the waiting time in VM operation queue") \ 643 \ 644 develop(bool, NoYieldsInMicrolock, false, \ 645 "Disable yields in microlock") \ 646 \ 647 develop(bool, TraceOopMapGeneration, false, \ 648 "Show OopMapGeneration") \ 649 \ 650 product(bool, MethodFlushing, true, \ 651 "Reclamation of zombie and not-entrant methods") \ 652 \ 653 develop(bool, VerifyStack, false, \ 654 "Verify stack of each thread when it is entering a runtime call") \ 655 \ 656 diagnostic(bool, ForceUnreachable, false, \ 657 "Make all non code cache addresses to be unreachable by " \ 658 "forcing use of 64bit literal fixups") \ 659 \ 660 notproduct(bool, StressDerivedPointers, false, \ 661 "Force scavenge when a derived pointer is detected on stack " \ 662 "after rtm call") \ 663 \ 664 develop(bool, TraceDerivedPointers, false, \ 665 "Trace traversal of derived pointers on stack") \ 666 \ 667 notproduct(bool, TraceCodeBlobStacks, false, \ 668 "Trace stack-walk of codeblobs") \ 669 \ 670 product(bool, PrintJNIResolving, false, \ 671 "Used to implement -v:jni") \ 672 \ 673 notproduct(bool, PrintRewrites, false, \ 674 "Print methods that are being rewritten") \ 675 \ 676 product(bool, UseInlineCaches, true, \ 677 "Use Inline Caches for virtual calls ") \ 678 \ 679 develop(bool, InlineArrayCopy, true, \ 680 "Inline arraycopy native that is known to be part of " \ 681 "base library DLL") \ 682 \ 683 develop(bool, InlineObjectHash, true, \ 684 "Inline Object::hashCode() native that is known to be part " \ 685 "of base library DLL") \ 686 \ 687 develop(bool, InlineNatives, true, \ 688 "Inline natives that are known to be part of base library DLL") \ 689 \ 690 develop(bool, InlineMathNatives, true, \ 691 "Inline SinD, CosD, etc.") \ 692 \ 693 develop(bool, InlineClassNatives, true, \ 694 "Inline Class.isInstance, etc") \ 695 \ 696 develop(bool, InlineThreadNatives, true, \ 697 "Inline Thread.currentThread, etc") \ 698 \ 699 develop(bool, InlineUnsafeOps, true, \ 700 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 701 \ 702 product(bool, CriticalJNINatives, true, \ 703 "Check for critical JNI entry points") \ 704 \ 705 notproduct(bool, StressCriticalJNINatives, false, \ 706 "Exercise register saving code in critical natives") \ 707 \ 708 product(bool, UseSSE42Intrinsics, false, \ 709 "SSE4.2 versions of intrinsics") \ 710 \ 711 product(bool, UseAESIntrinsics, false, \ 712 "Use intrinsics for AES versions of crypto") \ 713 \ 714 product(bool, UseSHA1Intrinsics, false, \ 715 "Use intrinsics for SHA-1 crypto hash function") \ 716 \ 717 product(bool, UseSHA256Intrinsics, false, \ 718 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 719 \ 720 product(bool, UseSHA512Intrinsics, false, \ 721 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 722 \ 723 product(bool, UseCRC32Intrinsics, false, \ 724 "use intrinsics for java.util.zip.CRC32") \ 725 \ 726 develop(bool, TraceCallFixup, false, \ 727 "Trace all call fixups") \ 728 \ 729 develop(bool, DeoptimizeALot, false, \ 730 "Deoptimize at every exit from the runtime system") \ 731 \ 732 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 733 "A comma separated list of bcis to deoptimize at") \ 734 \ 735 product(bool, DeoptimizeRandom, false, \ 736 "Deoptimize random frames on random exit from the runtime system")\ 737 \ 738 notproduct(bool, ZombieALot, false, \ 739 "Create zombies (non-entrant) at exit from the runtime system") \ 740 \ 741 product(bool, UnlinkSymbolsALot, false, \ 742 "Unlink unreferenced symbols from the symbol table at safepoints")\ 743 \ 744 notproduct(bool, WalkStackALot, false, \ 745 "Trace stack (no print) at every exit from the runtime system") \ 746 \ 747 product(bool, Debugging, false, \ 748 "Set when executing debug methods in debug.cpp " \ 749 "(to prevent triggering assertions)") \ 750 \ 751 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 752 "Enable strict checks that safepoints cannot happen for threads " \ 753 "that use No_Safepoint_Verifier") \ 754 \ 755 notproduct(bool, VerifyLastFrame, false, \ 756 "Verify oops on last frame on entry to VM") \ 757 \ 758 develop(bool, TraceHandleAllocation, false, \ 759 "Print out warnings when suspiciously many handles are allocated")\ 760 \ 761 product(bool, UseCompilerSafepoints, true, \ 762 "Stop at safepoints in compiled code") \ 763 \ 764 product(bool, FailOverToOldVerifier, true, \ 765 "Fail over to old verifier when split verifier fails") \ 766 \ 767 develop(bool, ShowSafepointMsgs, false, \ 768 "Show message about safepoint synchronization") \ 769 \ 770 product(bool, SafepointTimeout, false, \ 771 "Time out and warn or fail after SafepointTimeoutDelay " \ 772 "milliseconds if failed to reach safepoint") \ 773 \ 774 diagnostic(bool, AbortVMOnSafepointTimeout, false, \ 775 "Abort upon failure to reach safepoint (see SafepointTimeout)") \ 776 \ 777 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 778 /* typically, at most a few retries are needed */ \ 779 product(intx, SuspendRetryCount, 50, \ 780 "Maximum retry count for an external suspend request") \ 781 \ 782 product(intx, SuspendRetryDelay, 5, \ 783 "Milliseconds to delay per retry (* current_retry_count)") \ 784 \ 785 product(bool, AssertOnSuspendWaitFailure, false, \ 786 "Assert/Guarantee on external suspend wait failure") \ 787 \ 788 product(bool, TraceSuspendWaitFailures, false, \ 789 "Trace external suspend wait failures") \ 790 \ 791 product(bool, MaxFDLimit, true, \ 792 "Bump the number of file descriptors to maximum in Solaris") \ 793 \ 794 diagnostic(bool, LogEvents, true, \ 795 "Enable the various ring buffer event logs") \ 796 \ 797 diagnostic(uintx, LogEventsBufferEntries, 10, \ 798 "Number of ring buffer event logs") \ 799 \ 800 product(bool, BytecodeVerificationRemote, true, \ 801 "Enable the Java bytecode verifier for remote classes") \ 802 \ 803 product(bool, BytecodeVerificationLocal, false, \ 804 "Enable the Java bytecode verifier for local classes") \ 805 \ 806 develop(bool, ForceFloatExceptions, trueInDebug, \ 807 "Force exceptions on FP stack under/overflow") \ 808 \ 809 develop(bool, VerifyStackAtCalls, false, \ 810 "Verify that the stack pointer is unchanged after calls") \ 811 \ 812 develop(bool, TraceJavaAssertions, false, \ 813 "Trace java language assertions") \ 814 \ 815 notproduct(bool, CheckAssertionStatusDirectives, false, \ 816 "Temporary - see javaClasses.cpp") \ 817 \ 818 notproduct(bool, PrintMallocFree, false, \ 819 "Trace calls to C heap malloc/free allocation") \ 820 \ 821 product(bool, PrintOopAddress, false, \ 822 "Always print the location of the oop") \ 823 \ 824 notproduct(bool, VerifyCodeCacheOften, false, \ 825 "Verify compiled-code cache often") \ 826 \ 827 develop(bool, ZapDeadCompiledLocals, false, \ 828 "Zap dead locals in compiler frames") \ 829 \ 830 notproduct(bool, ZapDeadLocalsOld, false, \ 831 "Zap dead locals (old version, zaps all frames when " \ 832 "entering the VM") \ 833 \ 834 notproduct(bool, CheckOopishValues, false, \ 835 "Warn if value contains oop (requires ZapDeadLocals)") \ 836 \ 837 develop(bool, UseMallocOnly, false, \ 838 "Use only malloc/free for allocation (no resource area/arena)") \ 839 \ 840 develop(bool, PrintMalloc, false, \ 841 "Print all malloc/free calls") \ 842 \ 843 develop(bool, PrintMallocStatistics, false, \ 844 "Print malloc/free statistics") \ 845 \ 846 develop(bool, ZapResourceArea, trueInDebug, \ 847 "Zap freed resource/arena space with 0xABABABAB") \ 848 \ 849 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 850 "Zap freed VM handle space with 0xBCBCBCBC") \ 851 \ 852 develop(bool, ZapJNIHandleArea, trueInDebug, \ 853 "Zap freed JNI handle space with 0xFEFEFEFE") \ 854 \ 855 notproduct(bool, ZapStackSegments, trueInDebug, \ 856 "Zap allocated/freed stack segments with 0xFADFADED") \ 857 \ 858 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 859 "Zap unused heap space with 0xBAADBABE") \ 860 \ 861 develop(bool, TraceZapUnusedHeapArea, false, \ 862 "Trace zapping of unused heap space") \ 863 \ 864 develop(bool, CheckZapUnusedHeapArea, false, \ 865 "Check zapping of unused heap space") \ 866 \ 867 develop(bool, ZapFillerObjects, trueInDebug, \ 868 "Zap filler objects with 0xDEAFBABE") \ 869 \ 870 develop(bool, PrintVMMessages, true, \ 871 "Print VM messages on console") \ 872 \ 873 product(bool, PrintGCApplicationConcurrentTime, false, \ 874 "Print the time the application has been running") \ 875 \ 876 product(bool, PrintGCApplicationStoppedTime, false, \ 877 "Print the time the application has been stopped") \ 878 \ 879 diagnostic(bool, VerboseVerification, false, \ 880 "Display detailed verification details") \ 881 \ 882 notproduct(uintx, ErrorHandlerTest, 0, \ 883 "If > 0, provokes an error after VM initialization; the value " \ 884 "determines which error to provoke. See test_error_handler() " \ 885 "in debug.cpp.") \ 886 \ 887 develop(bool, Verbose, false, \ 888 "Print additional debugging information from other modes") \ 889 \ 890 develop(bool, PrintMiscellaneous, false, \ 891 "Print uncategorized debugging information (requires +Verbose)") \ 892 \ 893 develop(bool, WizardMode, false, \ 894 "Print much more debugging information") \ 895 \ 896 product(bool, ShowMessageBoxOnError, false, \ 897 "Keep process alive on VM fatal error") \ 898 \ 899 product(bool, CreateMinidumpOnCrash, false, \ 900 "Create minidump on VM fatal error") \ 901 \ 902 product_pd(bool, UseOSErrorReporting, \ 903 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 904 \ 905 product(bool, SuppressFatalErrorMessage, false, \ 906 "Report NO fatal error message (avoid deadlock)") \ 907 \ 908 product(ccstrlist, OnError, "", \ 909 "Run user-defined commands on fatal error; see VMError.cpp " \ 910 "for examples") \ 911 \ 912 product(ccstrlist, OnOutOfMemoryError, "", \ 913 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 914 \ 915 manageable(bool, HeapDumpBeforeFullGC, false, \ 916 "Dump heap to file before any major stop-the-world GC") \ 917 \ 918 manageable(bool, HeapDumpAfterFullGC, false, \ 919 "Dump heap to file after any major stop-the-world GC") \ 920 \ 921 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 922 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 923 \ 924 manageable(ccstr, HeapDumpPath, NULL, \ 925 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 926 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 927 "in the working directory)") \ 928 \ 929 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 930 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 931 "when the heap usage is larger than this") \ 932 \ 933 develop(uintx, HeapDumpSegmentSize, 1*G, \ 934 "Approximate segment size when generating a segmented heap dump") \ 935 \ 936 develop(bool, BreakAtWarning, false, \ 937 "Execute breakpoint upon encountering VM warning") \ 938 \ 939 develop(bool, TraceVMOperation, false, \ 940 "Trace VM operations") \ 941 \ 942 develop(bool, UseFakeTimers, false, \ 943 "Tell whether the VM should use system time or a fake timer") \ 944 \ 945 product(ccstr, NativeMemoryTracking, "off", \ 946 "Native memory tracking options") \ 947 \ 948 diagnostic(bool, PrintNMTStatistics, false, \ 949 "Print native memory tracking summary data if it is on") \ 950 \ 951 diagnostic(bool, LogCompilation, false, \ 952 "Log compilation activity in detail to LogFile") \ 953 \ 954 product(bool, PrintCompilation, false, \ 955 "Print compilations") \ 956 \ 957 diagnostic(bool, TraceNMethodInstalls, false, \ 958 "Trace nmethod installation") \ 959 \ 960 diagnostic(intx, ScavengeRootsInCode, 2, \ 961 "0: do not allow scavengable oops in the code cache; " \ 962 "1: allow scavenging from the code cache; " \ 963 "2: emit as many constants as the compiler can see") \ 964 \ 965 product(bool, AlwaysRestoreFPU, false, \ 966 "Restore the FPU control word after every JNI call (expensive)") \ 967 \ 968 diagnostic(bool, PrintCompilation2, false, \ 969 "Print additional statistics per compilation") \ 970 \ 971 diagnostic(bool, PrintAdapterHandlers, false, \ 972 "Print code generated for i2c/c2i adapters") \ 973 \ 974 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 975 "Verify that i2c/c2i adapters are called properly") \ 976 \ 977 develop(bool, VerifyAdapterSharing, false, \ 978 "Verify that the code for shared adapters is the equivalent") \ 979 \ 980 diagnostic(bool, PrintAssembly, false, \ 981 "Print assembly code (using external disassembler.so)") \ 982 \ 983 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 984 "Print options string passed to disassembler.so") \ 985 \ 986 diagnostic(bool, PrintNMethods, false, \ 987 "Print assembly code for nmethods when generated") \ 988 \ 989 diagnostic(bool, PrintNativeNMethods, false, \ 990 "Print assembly code for native nmethods when generated") \ 991 \ 992 develop(bool, PrintDebugInfo, false, \ 993 "Print debug information for all nmethods when generated") \ 994 \ 995 develop(bool, PrintRelocations, false, \ 996 "Print relocation information for all nmethods when generated") \ 997 \ 998 develop(bool, PrintDependencies, false, \ 999 "Print dependency information for all nmethods when generated") \ 1000 \ 1001 develop(bool, PrintExceptionHandlers, false, \ 1002 "Print exception handler tables for all nmethods when generated") \ 1003 \ 1004 develop(bool, StressCompiledExceptionHandlers, false, \ 1005 "Exercise compiled exception handlers") \ 1006 \ 1007 develop(bool, InterceptOSException, false, \ 1008 "Start debugger when an implicit OS (e.g. NULL) " \ 1009 "exception happens") \ 1010 \ 1011 product(bool, PrintCodeCache, false, \ 1012 "Print the code cache memory usage when exiting") \ 1013 \ 1014 develop(bool, PrintCodeCache2, false, \ 1015 "Print detailed usage information on the code cache when exiting")\ 1016 \ 1017 product(bool, PrintCodeCacheOnCompilation, false, \ 1018 "Print the code cache memory usage each time a method is " \ 1019 "compiled") \ 1020 \ 1021 diagnostic(bool, PrintStubCode, false, \ 1022 "Print generated stub code") \ 1023 \ 1024 product(bool, StackTraceInThrowable, true, \ 1025 "Collect backtrace in throwable when exception happens") \ 1026 \ 1027 product(bool, OmitStackTraceInFastThrow, true, \ 1028 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1029 \ 1030 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1031 "Print bytecode statistics when dumping profiler output") \ 1032 \ 1033 product(bool, ProfilerRecordPC, false, \ 1034 "Collect ticks for each 16 byte interval of compiled code") \ 1035 \ 1036 product(bool, ProfileVM, false, \ 1037 "Profile ticks that fall within VM (either in the VM Thread " \ 1038 "or VM code called through stubs)") \ 1039 \ 1040 product(bool, ProfileIntervals, false, \ 1041 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1042 \ 1043 notproduct(bool, ProfilerCheckIntervals, false, \ 1044 "Collect and print information on spacing of profiler ticks") \ 1045 \ 1046 develop(bool, PrintJVMWarnings, false, \ 1047 "Print warnings for unimplemented JVM functions") \ 1048 \ 1049 product(bool, PrintWarnings, true, \ 1050 "Print JVM warnings to output stream") \ 1051 \ 1052 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1053 "Print warnings for stalled SpinLocks") \ 1054 \ 1055 product(bool, RegisterFinalizersAtInit, true, \ 1056 "Register finalizable objects at end of Object.<init> or " \ 1057 "after allocation") \ 1058 \ 1059 develop(bool, RegisterReferences, true, \ 1060 "Tell whether the VM should register soft/weak/final/phantom " \ 1061 "references") \ 1062 \ 1063 develop(bool, IgnoreRewrites, false, \ 1064 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1065 "This is unsafe!") \ 1066 \ 1067 develop(bool, PrintCodeCacheExtension, false, \ 1068 "Print extension of code cache") \ 1069 \ 1070 develop(bool, UsePrivilegedStack, true, \ 1071 "Enable the security JVM functions") \ 1072 \ 1073 develop(bool, ProtectionDomainVerification, true, \ 1074 "Verify protection domain before resolution in system dictionary")\ 1075 \ 1076 product(bool, ClassUnloading, true, \ 1077 "Do unloading of classes") \ 1078 \ 1079 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1080 "Do unloading of classes with a concurrent marking cycle") \ 1081 \ 1082 develop(bool, DisableStartThread, false, \ 1083 "Disable starting of additional Java threads " \ 1084 "(for debugging only)") \ 1085 \ 1086 develop(bool, MemProfiling, false, \ 1087 "Write memory usage profiling to log file") \ 1088 \ 1089 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1090 "Print the system dictionary at exit") \ 1091 \ 1092 experimental(intx, PredictedLoadedClassCount, 0, \ 1093 "Experimental: Tune loaded class cache starting size") \ 1094 \ 1095 diagnostic(bool, UnsyncloadClass, false, \ 1096 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1097 "class loader must call VM synchronized for findClass " \ 1098 "and defineClass.") \ 1099 \ 1100 product(bool, AlwaysLockClassLoader, false, \ 1101 "Require the VM to acquire the class loader lock before calling " \ 1102 "loadClass() even for class loaders registering " \ 1103 "as parallel capable") \ 1104 \ 1105 product(bool, AllowParallelDefineClass, false, \ 1106 "Allow parallel defineClass requests for class loaders " \ 1107 "registering as parallel capable") \ 1108 \ 1109 product(bool, MustCallLoadClassInternal, false, \ 1110 "Call loadClassInternal() rather than loadClass()") \ 1111 \ 1112 product_pd(bool, DontYieldALot, \ 1113 "Throw away obvious excess yield calls (for Solaris only)") \ 1114 \ 1115 product_pd(bool, ConvertSleepToYield, \ 1116 "Convert sleep(0) to thread yield " \ 1117 "(may be off for Solaris to improve GUI)") \ 1118 \ 1119 product(bool, ConvertYieldToSleep, false, \ 1120 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1121 "behavior (Solaris only)") \ 1122 \ 1123 product(bool, UseBoundThreads, true, \ 1124 "Bind user level threads to kernel threads (for Solaris only)") \ 1125 \ 1126 develop(bool, UseDetachedThreads, true, \ 1127 "Use detached threads that are recycled upon termination " \ 1128 "(for Solaris only)") \ 1129 \ 1130 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 1131 "Disable the use of stack guard pages if the JVM is loaded " \ 1132 "on the primordial process thread") \ 1133 \ 1134 product(bool, UseLWPSynchronization, true, \ 1135 "Use LWP-based instead of libthread-based synchronization " \ 1136 "(SPARC only)") \ 1137 \ 1138 product(ccstr, SyncKnobs, NULL, \ 1139 "(Unstable) Various monitor synchronization tunables") \ 1140 \ 1141 product(intx, EmitSync, 0, \ 1142 "(Unsafe, Unstable) " \ 1143 "Control emission of inline sync fast-path code") \ 1144 \ 1145 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1146 \ 1147 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1148 \ 1149 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \ 1150 \ 1151 product(intx, SyncVerbose, 0, "(Unstable)") \ 1152 \ 1153 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1154 \ 1155 product(intx, hashCode, 5, \ 1156 "(Unstable) select hashCode generation algorithm") \ 1157 \ 1158 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1159 "(Unstable, Linux-specific) " \ 1160 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1161 \ 1162 product(bool, FilterSpuriousWakeups, true, \ 1163 "Prevent spurious or premature wakeups from object.wait " \ 1164 "(Solaris only)") \ 1165 \ 1166 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1167 \ 1168 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1169 \ 1170 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1171 \ 1172 develop(bool, UsePthreads, false, \ 1173 "Use pthread-based instead of libthread-based synchronization " \ 1174 "(SPARC only)") \ 1175 \ 1176 product(bool, AdjustConcurrency, false, \ 1177 "Call thr_setconcurrency at thread creation time to avoid " \ 1178 "LWP starvation on MP systems (for Solaris Only)") \ 1179 \ 1180 product(bool, ReduceSignalUsage, false, \ 1181 "Reduce the use of OS signals in Java and/or the VM") \ 1182 \ 1183 develop_pd(bool, ShareVtableStubs, \ 1184 "Share vtable stubs (smaller code but worse branch prediction") \ 1185 \ 1186 develop(bool, LoadLineNumberTables, true, \ 1187 "Tell whether the class file parser loads line number tables") \ 1188 \ 1189 develop(bool, LoadLocalVariableTables, true, \ 1190 "Tell whether the class file parser loads local variable tables") \ 1191 \ 1192 develop(bool, LoadLocalVariableTypeTables, true, \ 1193 "Tell whether the class file parser loads local variable type" \ 1194 "tables") \ 1195 \ 1196 product(bool, AllowUserSignalHandlers, false, \ 1197 "Do not complain if the application installs signal handlers " \ 1198 "(Solaris & Linux only)") \ 1199 \ 1200 product(bool, UseSignalChaining, true, \ 1201 "Use signal-chaining to invoke signal handlers installed " \ 1202 "by the application (Solaris & Linux only)") \ 1203 \ 1204 product(bool, UseAltSigs, false, \ 1205 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1206 "internal signals (Solaris only)") \ 1207 \ 1208 product(bool, AllowJNIEnvProxy, false, \ 1209 "Allow JNIEnv proxies for jdbx") \ 1210 \ 1211 product(bool, JNIDetachReleasesMonitors, true, \ 1212 "JNI DetachCurrentThread releases monitors owned by thread") \ 1213 \ 1214 product(bool, RestoreMXCSROnJNICalls, false, \ 1215 "Restore MXCSR when returning from JNI calls") \ 1216 \ 1217 product(bool, CheckJNICalls, false, \ 1218 "Verify all arguments to JNI calls") \ 1219 \ 1220 product(bool, CheckEndorsedAndExtDirs, false, \ 1221 "Verify the endorsed and extension directories are not used") \ 1222 \ 1223 product(bool, UseFastJNIAccessors, true, \ 1224 "Use optimized versions of Get<Primitive>Field") \ 1225 \ 1226 product(intx, MaxJNILocalCapacity, 65536, \ 1227 "Maximum allowable local JNI handle capacity to " \ 1228 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1229 "where <= 0 is unlimited, default: 65536") \ 1230 \ 1231 product(bool, EagerXrunInit, false, \ 1232 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1233 "but not all -Xrun libraries may support the state of the VM " \ 1234 "at this time") \ 1235 \ 1236 product(bool, PreserveAllAnnotations, false, \ 1237 "Preserve RuntimeInvisibleAnnotations as well " \ 1238 "as RuntimeVisibleAnnotations") \ 1239 \ 1240 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1241 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1242 \ 1243 product(bool, LazyBootClassLoader, true, \ 1244 "Enable/disable lazy opening of boot class path entries") \ 1245 \ 1246 product(bool, UseXMMForArrayCopy, false, \ 1247 "Use SSE2 MOVQ instruction for Arraycopy") \ 1248 \ 1249 product(intx, FieldsAllocationStyle, 1, \ 1250 "0 - type based with oops first, 1 - with oops last, " \ 1251 "2 - oops in super and sub classes are together") \ 1252 \ 1253 product(bool, CompactFields, true, \ 1254 "Allocate nonstatic fields in gaps between previous fields") \ 1255 \ 1256 notproduct(bool, PrintFieldLayout, false, \ 1257 "Print field layout for each class") \ 1258 \ 1259 product(intx, ContendedPaddingWidth, 128, \ 1260 "How many bytes to pad the fields/classes marked @Contended with")\ 1261 \ 1262 product(bool, EnableContended, true, \ 1263 "Enable @Contended annotation support") \ 1264 \ 1265 product(bool, RestrictContended, true, \ 1266 "Restrict @Contended to trusted classes") \ 1267 \ 1268 product(bool, UseBiasedLocking, true, \ 1269 "Enable biased locking in JVM") \ 1270 \ 1271 product(intx, BiasedLockingStartupDelay, 4000, \ 1272 "Number of milliseconds to wait before enabling biased locking") \ 1273 \ 1274 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1275 "Print statistics of biased locking in JVM") \ 1276 \ 1277 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1278 "Threshold of number of revocations per type to try to " \ 1279 "rebias all objects in the heap of that type") \ 1280 \ 1281 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1282 "Threshold of number of revocations per type to permanently " \ 1283 "revoke biases of all objects in the heap of that type") \ 1284 \ 1285 product(intx, BiasedLockingDecayTime, 25000, \ 1286 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1287 "type after previous bulk rebias") \ 1288 \ 1289 product(bool, ExitOnOutOfMemoryError, false, \ 1290 "JVM exits on the first occurrence of an out-of-memory error") \ 1291 \ 1292 product(bool, CrashOnOutOfMemoryError, false, \ 1293 "JVM aborts, producing an error log and core/mini dump, on the " \ 1294 "first occurrence of an out-of-memory error") \ 1295 \ 1296 /* tracing */ \ 1297 \ 1298 notproduct(bool, TraceRuntimeCalls, false, \ 1299 "Trace run-time calls") \ 1300 \ 1301 develop(bool, TraceJNICalls, false, \ 1302 "Trace JNI calls") \ 1303 \ 1304 develop(bool, StressRewriter, false, \ 1305 "Stress linktime bytecode rewriting") \ 1306 \ 1307 notproduct(bool, TraceJVMCalls, false, \ 1308 "Trace JVM calls") \ 1309 \ 1310 product(ccstr, TraceJVMTI, NULL, \ 1311 "Trace flags for JVMTI functions and events") \ 1312 \ 1313 /* This option can change an EMCP method into an obsolete method. */ \ 1314 /* This can affect tests that except specific methods to be EMCP. */ \ 1315 /* This option should be used with caution. */ \ 1316 product(bool, StressLdcRewrite, false, \ 1317 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1318 \ 1319 product(intx, TraceRedefineClasses, 0, \ 1320 "Trace level for JVMTI RedefineClasses") \ 1321 \ 1322 develop(bool, StressMethodComparator, false, \ 1323 "Run the MethodComparator on all loaded methods") \ 1324 \ 1325 /* change to false by default sometime after Mustang */ \ 1326 product(bool, VerifyMergedCPBytecodes, true, \ 1327 "Verify bytecodes after RedefineClasses constant pool merging") \ 1328 \ 1329 develop(bool, TraceJNIHandleAllocation, false, \ 1330 "Trace allocation/deallocation of JNI handle blocks") \ 1331 \ 1332 develop(bool, TraceThreadEvents, false, \ 1333 "Trace all thread events") \ 1334 \ 1335 develop(bool, TraceBytecodes, false, \ 1336 "Trace bytecode execution") \ 1337 \ 1338 develop(bool, TraceClassInitialization, false, \ 1339 "Trace class initialization") \ 1340 \ 1341 develop(bool, TraceExceptions, false, \ 1342 "Trace exceptions") \ 1343 \ 1344 develop(bool, TraceICs, false, \ 1345 "Trace inline cache changes") \ 1346 \ 1347 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1348 "Trace method invocation counter overflow") \ 1349 \ 1350 develop(bool, TraceInlineCacheClearing, false, \ 1351 "Trace clearing of inline caches in nmethods") \ 1352 \ 1353 develop(bool, TraceDependencies, false, \ 1354 "Trace dependencies") \ 1355 \ 1356 develop(bool, VerifyDependencies, trueInDebug, \ 1357 "Exercise and verify the compilation dependency mechanism") \ 1358 \ 1359 develop(bool, TraceNewOopMapGeneration, false, \ 1360 "Trace OopMapGeneration") \ 1361 \ 1362 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1363 "Trace OopMapGeneration: print detailed cell states") \ 1364 \ 1365 develop(bool, TimeOopMap, false, \ 1366 "Time calls to GenerateOopMap::compute_map() in sum") \ 1367 \ 1368 develop(bool, TimeOopMap2, false, \ 1369 "Time calls to GenerateOopMap::compute_map() individually") \ 1370 \ 1371 develop(bool, TraceMonitorMismatch, false, \ 1372 "Trace monitor matching failures during OopMapGeneration") \ 1373 \ 1374 develop(bool, TraceOopMapRewrites, false, \ 1375 "Trace rewriting of method oops during oop map generation") \ 1376 \ 1377 develop(bool, TraceSafepoint, false, \ 1378 "Trace safepoint operations") \ 1379 \ 1380 develop(bool, TraceICBuffer, false, \ 1381 "Trace usage of IC buffer") \ 1382 \ 1383 develop(bool, TraceCompiledIC, false, \ 1384 "Trace changes of compiled IC") \ 1385 \ 1386 notproduct(bool, TraceZapDeadLocals, false, \ 1387 "Trace zapping dead locals") \ 1388 \ 1389 develop(bool, TraceStartupTime, false, \ 1390 "Trace setup time") \ 1391 \ 1392 develop(bool, TraceProtectionDomainVerification, false, \ 1393 "Trace protection domain verification") \ 1394 \ 1395 develop(bool, TraceClearedExceptions, false, \ 1396 "Print when an exception is forcibly cleared") \ 1397 \ 1398 product(bool, TraceClassResolution, false, \ 1399 "Trace all constant pool resolutions (for debugging)") \ 1400 \ 1401 product(bool, TraceBiasedLocking, false, \ 1402 "Trace biased locking in JVM") \ 1403 \ 1404 product(bool, TraceMonitorInflation, false, \ 1405 "Trace monitor inflation in JVM") \ 1406 \ 1407 /* gc */ \ 1408 \ 1409 product(bool, UseSerialGC, false, \ 1410 "Use the Serial garbage collector") \ 1411 \ 1412 product(bool, UseG1GC, false, \ 1413 "Use the Garbage-First garbage collector") \ 1414 \ 1415 product(bool, UseParallelGC, false, \ 1416 "Use the Parallel Scavenge garbage collector") \ 1417 \ 1418 product(bool, UseParallelOldGC, false, \ 1419 "Use the Parallel Old garbage collector") \ 1420 \ 1421 product(uintx, HeapMaximumCompactionInterval, 20, \ 1422 "How often should we maximally compact the heap (not allowing " \ 1423 "any dead space)") \ 1424 \ 1425 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1426 "The collection count for the first maximum compaction") \ 1427 \ 1428 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1429 "Use maximum compaction in the Parallel Old garbage collector " \ 1430 "for a system GC") \ 1431 \ 1432 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1433 "The mean used by the parallel compact dead wood " \ 1434 "limiter (a number between 0-100)") \ 1435 \ 1436 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1437 "The standard deviation used by the parallel compact dead wood " \ 1438 "limiter (a number between 0-100)") \ 1439 \ 1440 product(uintx, ParallelGCThreads, 0, \ 1441 "Number of parallel threads parallel gc will use") \ 1442 \ 1443 product(bool, UseDynamicNumberOfGCThreads, false, \ 1444 "Dynamically choose the number of parallel threads " \ 1445 "parallel gc will use") \ 1446 \ 1447 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1448 "Force dynamic selection of the number of " \ 1449 "parallel threads parallel gc will use to aid debugging") \ 1450 \ 1451 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1452 "Size of heap (bytes) per GC thread used in calculating the " \ 1453 "number of GC threads") \ 1454 \ 1455 product(bool, TraceDynamicGCThreads, false, \ 1456 "Trace the dynamic GC thread usage") \ 1457 \ 1458 develop(bool, ParallelOldGCSplitALot, false, \ 1459 "Provoke splitting (copying data from a young gen space to " \ 1460 "multiple destination spaces)") \ 1461 \ 1462 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1463 "How often to provoke splitting a young gen space") \ 1464 \ 1465 product(uintx, ConcGCThreads, 0, \ 1466 "Number of threads concurrent gc will use") \ 1467 \ 1468 product(uintx, YoungPLABSize, 4096, \ 1469 "Size of young gen promotion LAB's (in HeapWords)") \ 1470 \ 1471 product(uintx, OldPLABSize, 1024, \ 1472 "Size of old gen promotion LAB's (in HeapWords)") \ 1473 \ 1474 product(uintx, GCTaskTimeStampEntries, 200, \ 1475 "Number of time stamp entries per gc worker thread") \ 1476 \ 1477 product(bool, AlwaysTenure, false, \ 1478 "Always tenure objects in eden (ParallelGC only)") \ 1479 \ 1480 product(bool, NeverTenure, false, \ 1481 "Never tenure objects in eden, may tenure on overflow " \ 1482 "(ParallelGC only)") \ 1483 \ 1484 product(bool, ScavengeBeforeFullGC, true, \ 1485 "Scavenge youngest generation before each full GC, " \ 1486 "used with UseParallelGC") \ 1487 \ 1488 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1489 "Allow scavenges to occur when to-space contains objects") \ 1490 \ 1491 product(bool, UseConcMarkSweepGC, false, \ 1492 "Use Concurrent Mark-Sweep GC in the old generation") \ 1493 \ 1494 product(bool, ExplicitGCInvokesConcurrent, false, \ 1495 "A System.gc() request invokes a concurrent collection; " \ 1496 "(effective only when UseConcMarkSweepGC)") \ 1497 \ 1498 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1499 "A System.gc() request invokes a concurrent collection and " \ 1500 "also unloads classes during such a concurrent gc cycle " \ 1501 "(effective only when UseConcMarkSweepGC)") \ 1502 \ 1503 product(bool, GCLockerInvokesConcurrent, false, \ 1504 "The exit of a JNI critical section necessitating a scavenge, " \ 1505 "also kicks off a background concurrent collection") \ 1506 \ 1507 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1508 "How much the GC can expand the eden by while the GC locker " \ 1509 "is active (as a percentage)") \ 1510 \ 1511 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1512 "Number of times to retry allocations when " \ 1513 "blocked by the GC locker") \ 1514 \ 1515 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1516 "Use adaptive free lists in the CMS generation") \ 1517 \ 1518 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1519 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1520 \ 1521 develop(bool, RotateCMSCollectionTypes, false, \ 1522 "Rotate the CMS collections among concurrent and STW") \ 1523 \ 1524 product(bool, UseCMSBestFit, true, \ 1525 "Use CMS best fit allocation strategy") \ 1526 \ 1527 product(bool, UseCMSCollectionPassing, true, \ 1528 "Use passing of collection from background to foreground") \ 1529 \ 1530 product(bool, UseParNewGC, false, \ 1531 "Use parallel threads in the new generation") \ 1532 \ 1533 product(bool, ParallelGCVerbose, false, \ 1534 "Verbose output for parallel gc") \ 1535 \ 1536 product(uintx, ParallelGCBufferWastePct, 10, \ 1537 "Wasted fraction of parallel allocation buffer") \ 1538 \ 1539 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1540 "Retain parallel allocation buffers across scavenges; " \ 1541 "it is disabled because this currently conflicts with " \ 1542 "parallel card scanning under certain conditions.") \ 1543 \ 1544 product(uintx, TargetPLABWastePct, 10, \ 1545 "Target wasted space in last buffer as percent of overall " \ 1546 "allocation") \ 1547 \ 1548 product(uintx, PLABWeight, 75, \ 1549 "Percentage (0-100) used to weigh the current sample when " \ 1550 "computing exponentially decaying average for ResizePLAB") \ 1551 \ 1552 product(bool, ResizePLAB, true, \ 1553 "Dynamically resize (survivor space) promotion LAB's") \ 1554 \ 1555 product(bool, PrintPLAB, false, \ 1556 "Print (survivor space) promotion LAB's sizing decisions") \ 1557 \ 1558 product(intx, ParGCArrayScanChunk, 50, \ 1559 "Scan a subset of object array and push remainder, if array is " \ 1560 "bigger than this") \ 1561 \ 1562 product(bool, ParGCUseLocalOverflow, false, \ 1563 "Instead of a global overflow list, use local overflow stacks") \ 1564 \ 1565 product(bool, ParGCTrimOverflow, true, \ 1566 "Eagerly trim the local overflow lists " \ 1567 "(when ParGCUseLocalOverflow)") \ 1568 \ 1569 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1570 "Simulate work queue overflow in ParNew") \ 1571 \ 1572 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1573 "An `interval' counter that determines how frequently " \ 1574 "we simulate overflow; a smaller number increases frequency") \ 1575 \ 1576 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1577 "The desired number of objects to claim from the overflow list") \ 1578 \ 1579 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1580 "The number of strides per worker thread that we divide up the " \ 1581 "card table scanning work into") \ 1582 \ 1583 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1584 "The number of cards in each chunk of the parallel chunks used " \ 1585 "during card table scanning") \ 1586 \ 1587 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1588 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1589 "for parallel GC") \ 1590 \ 1591 product(uintx, OldPLABWeight, 50, \ 1592 "Percentage (0-100) used to weight the current sample when " \ 1593 "computing exponentially decaying average for resizing " \ 1594 "CMSParPromoteBlocksToClaim") \ 1595 \ 1596 product(bool, ResizeOldPLAB, true, \ 1597 "Dynamically resize (old gen) promotion LAB's") \ 1598 \ 1599 product(bool, PrintOldPLAB, false, \ 1600 "Print (old gen) promotion LAB's sizing decisions") \ 1601 \ 1602 product(uintx, CMSOldPLABMin, 16, \ 1603 "Minimum size of CMS gen promotion LAB caches per worker " \ 1604 "per block size") \ 1605 \ 1606 product(uintx, CMSOldPLABMax, 1024, \ 1607 "Maximum size of CMS gen promotion LAB caches per worker " \ 1608 "per block size") \ 1609 \ 1610 product(uintx, CMSOldPLABNumRefills, 4, \ 1611 "Nominal number of refills of CMS gen promotion LAB cache " \ 1612 "per worker per block size") \ 1613 \ 1614 product(bool, CMSOldPLABResizeQuicker, false, \ 1615 "React on-the-fly during a scavenge to a sudden " \ 1616 "change in block demand rate") \ 1617 \ 1618 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1619 "The tolerance of the phase-change detector for on-the-fly " \ 1620 "PLAB resizing during a scavenge") \ 1621 \ 1622 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1623 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1624 "during a scavenge") \ 1625 \ 1626 product(bool, AlwaysPreTouch, false, \ 1627 "Force all freshly committed pages to be pre-touched") \ 1628 \ 1629 product_pd(uintx, CMSYoungGenPerWorker, \ 1630 "The maximum size of young gen chosen by default per GC worker " \ 1631 "thread available") \ 1632 \ 1633 product(bool, CMSIncrementalMode, false, \ 1634 "Whether CMS GC should operate in \"incremental\" mode") \ 1635 \ 1636 product(uintx, CMSIncrementalDutyCycle, 10, \ 1637 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1638 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1639 "value.") \ 1640 \ 1641 product(bool, CMSIncrementalPacing, true, \ 1642 "Whether the CMS incremental mode duty cycle should be " \ 1643 "automatically adjusted") \ 1644 \ 1645 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1646 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1647 "used when CMSIncrementalPacing is enabled") \ 1648 \ 1649 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1650 "Percentage (0-100) used to add conservatism when computing the " \ 1651 "duty cycle") \ 1652 \ 1653 product(uintx, CMSIncrementalOffset, 0, \ 1654 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1655 "is shifted to the right within the period between young GCs") \ 1656 \ 1657 product(uintx, CMSExpAvgFactor, 50, \ 1658 "Percentage (0-100) used to weigh the current sample when " \ 1659 "computing exponential averages for CMS statistics") \ 1660 \ 1661 product(uintx, CMS_FLSWeight, 75, \ 1662 "Percentage (0-100) used to weigh the current sample when " \ 1663 "computing exponentially decaying averages for CMS FLS " \ 1664 "statistics") \ 1665 \ 1666 product(uintx, CMS_FLSPadding, 1, \ 1667 "The multiple of deviation from mean to use for buffering " \ 1668 "against volatility in free list demand") \ 1669 \ 1670 product(uintx, FLSCoalescePolicy, 2, \ 1671 "CMS: aggressiveness level for coalescing, increasing " \ 1672 "from 0 to 4") \ 1673 \ 1674 product(bool, FLSAlwaysCoalesceLarge, false, \ 1675 "CMS: larger free blocks are always available for coalescing") \ 1676 \ 1677 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1678 "CMS: the smaller the percentage the greater the coalescing " \ 1679 "force") \ 1680 \ 1681 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1682 "CMS: the factor by which to inflate estimated demand of small " \ 1683 "block sizes to prevent coalescing with an adjoining block") \ 1684 \ 1685 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1686 "CMS: the factor by which to inflate estimated demand of large " \ 1687 "block sizes to prevent coalescing with an adjoining block") \ 1688 \ 1689 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1690 "CMS: the factor by which to inflate estimated demand of small " \ 1691 "block sizes to prevent splitting to supply demand for smaller " \ 1692 "blocks") \ 1693 \ 1694 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1695 "CMS: the factor by which to inflate estimated demand of large " \ 1696 "block sizes to prevent splitting to supply demand for smaller " \ 1697 "blocks") \ 1698 \ 1699 product(bool, CMSExtrapolateSweep, false, \ 1700 "CMS: cushion for block demand during sweep") \ 1701 \ 1702 product(uintx, CMS_SweepWeight, 75, \ 1703 "Percentage (0-100) used to weight the current sample when " \ 1704 "computing exponentially decaying average for inter-sweep " \ 1705 "duration") \ 1706 \ 1707 product(uintx, CMS_SweepPadding, 1, \ 1708 "The multiple of deviation from mean to use for buffering " \ 1709 "against volatility in inter-sweep duration") \ 1710 \ 1711 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1712 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1713 "duration exceeds this threshold in milliseconds") \ 1714 \ 1715 develop(bool, CMSTraceIncrementalMode, false, \ 1716 "Trace CMS incremental mode") \ 1717 \ 1718 develop(bool, CMSTraceIncrementalPacing, false, \ 1719 "Trace CMS incremental mode pacing computation") \ 1720 \ 1721 develop(bool, CMSTraceThreadState, false, \ 1722 "Trace the CMS thread state (enable the trace_state() method)") \ 1723 \ 1724 product(bool, CMSClassUnloadingEnabled, true, \ 1725 "Whether class unloading enabled when using CMS GC") \ 1726 \ 1727 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1728 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1729 "count for which classes may not be unloaded") \ 1730 \ 1731 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1732 "Compact when asked to collect CMS gen with " \ 1733 "clear_all_soft_refs()") \ 1734 \ 1735 product(bool, UseCMSCompactAtFullCollection, true, \ 1736 "Use Mark-Sweep-Compact algorithm at full collections") \ 1737 \ 1738 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1739 "Number of CMS full collection done before compaction if > 0") \ 1740 \ 1741 develop(intx, CMSDictionaryChoice, 0, \ 1742 "Use BinaryTreeDictionary as default in the CMS generation") \ 1743 \ 1744 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1745 "Replenish an indexed free list with this number of chunks") \ 1746 \ 1747 product(bool, CMSReplenishIntermediate, true, \ 1748 "Replenish all intermediate free-list caches") \ 1749 \ 1750 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1751 "When satisfying batched demand, split blocks from the " \ 1752 "IndexedFreeList whose size is a multiple of requested size") \ 1753 \ 1754 product(bool, CMSLoopWarn, false, \ 1755 "Warn in case of excessive CMS looping") \ 1756 \ 1757 develop(bool, CMSOverflowEarlyRestoration, false, \ 1758 "Restore preserved marks early") \ 1759 \ 1760 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1761 "Size of marking stack") \ 1762 \ 1763 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1764 "Maximum size of marking stack") \ 1765 \ 1766 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1767 "Simulate frequent marking stack / work queue overflow") \ 1768 \ 1769 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1770 "An \"interval\" counter that determines how frequently " \ 1771 "to simulate overflow; a smaller number increases frequency") \ 1772 \ 1773 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1774 "(Temporary, subject to experimentation) " \ 1775 "Maximum number of abortable preclean iterations, if > 0") \ 1776 \ 1777 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1778 "(Temporary, subject to experimentation) " \ 1779 "Maximum time in abortable preclean (in milliseconds)") \ 1780 \ 1781 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1782 "(Temporary, subject to experimentation) " \ 1783 "Nominal minimum work per abortable preclean iteration") \ 1784 \ 1785 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1786 "(Temporary, subject to experimentation) " \ 1787 "Time that we sleep between iterations when not given " \ 1788 "enough work per iteration") \ 1789 \ 1790 product(uintx, CMSRescanMultiple, 32, \ 1791 "Size (in cards) of CMS parallel rescan task") \ 1792 \ 1793 product(uintx, CMSConcMarkMultiple, 32, \ 1794 "Size (in cards) of CMS concurrent MT marking task") \ 1795 \ 1796 product(bool, CMSAbortSemantics, false, \ 1797 "Whether abort-on-overflow semantics is implemented") \ 1798 \ 1799 product(bool, CMSParallelInitialMarkEnabled, true, \ 1800 "Use the parallel initial mark.") \ 1801 \ 1802 product(bool, CMSParallelRemarkEnabled, true, \ 1803 "Whether parallel remark enabled (only if ParNewGC)") \ 1804 \ 1805 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1806 "Whether parallel remark of survivor space " \ 1807 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1808 \ 1809 product(bool, CMSPLABRecordAlways, true, \ 1810 "Always record survivor space PLAB boundaries (effective only " \ 1811 "if CMSParallelSurvivorRemarkEnabled)") \ 1812 \ 1813 product(bool, CMSEdenChunksRecordAlways, true, \ 1814 "Always record eden chunks used for the parallel initial mark " \ 1815 "or remark of eden") \ 1816 \ 1817 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1818 "Print the eden and the survivor chunks used for the parallel " \ 1819 "initial mark or remark of the eden/survivor spaces") \ 1820 \ 1821 product(bool, CMSConcurrentMTEnabled, true, \ 1822 "Whether multi-threaded concurrent work enabled " \ 1823 "(effective only if ParNewGC)") \ 1824 \ 1825 product(bool, CMSPrecleaningEnabled, true, \ 1826 "Whether concurrent precleaning enabled") \ 1827 \ 1828 product(uintx, CMSPrecleanIter, 3, \ 1829 "Maximum number of precleaning iteration passes") \ 1830 \ 1831 product(uintx, CMSPrecleanNumerator, 2, \ 1832 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1833 "ratio") \ 1834 \ 1835 product(uintx, CMSPrecleanDenominator, 3, \ 1836 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1837 "ratio") \ 1838 \ 1839 product(bool, CMSPrecleanRefLists1, true, \ 1840 "Preclean ref lists during (initial) preclean phase") \ 1841 \ 1842 product(bool, CMSPrecleanRefLists2, false, \ 1843 "Preclean ref lists during abortable preclean phase") \ 1844 \ 1845 product(bool, CMSPrecleanSurvivors1, false, \ 1846 "Preclean survivors during (initial) preclean phase") \ 1847 \ 1848 product(bool, CMSPrecleanSurvivors2, true, \ 1849 "Preclean survivors during abortable preclean phase") \ 1850 \ 1851 product(uintx, CMSPrecleanThreshold, 1000, \ 1852 "Do not iterate again if number of dirty cards is less than this")\ 1853 \ 1854 product(bool, CMSCleanOnEnter, true, \ 1855 "Clean-on-enter optimization for reducing number of dirty cards") \ 1856 \ 1857 product(uintx, CMSRemarkVerifyVariant, 1, \ 1858 "Choose variant (1,2) of verification following remark") \ 1859 \ 1860 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1861 "If Eden size is below this, do not try to schedule remark") \ 1862 \ 1863 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1864 "The Eden occupancy percentage (0-100) at which " \ 1865 "to try and schedule remark pause") \ 1866 \ 1867 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1868 "Start sampling eden top at least before young gen " \ 1869 "occupancy reaches 1/<ratio> of the size at which " \ 1870 "we plan to schedule remark") \ 1871 \ 1872 product(uintx, CMSSamplingGrain, 16*K, \ 1873 "The minimum distance between eden samples for CMS (see above)") \ 1874 \ 1875 product(bool, CMSScavengeBeforeRemark, false, \ 1876 "Attempt scavenge before the CMS remark step") \ 1877 \ 1878 develop(bool, CMSTraceSweeper, false, \ 1879 "Trace some actions of the CMS sweeper") \ 1880 \ 1881 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1882 "Don't drain below this size per parallel worker/thief") \ 1883 \ 1884 manageable(intx, CMSWaitDuration, 2000, \ 1885 "Time in milliseconds that CMS thread waits for young GC") \ 1886 \ 1887 develop(uintx, CMSCheckInterval, 1000, \ 1888 "Interval in milliseconds that CMS thread checks if it " \ 1889 "should start a collection cycle") \ 1890 \ 1891 product(bool, CMSYield, true, \ 1892 "Yield between steps of CMS") \ 1893 \ 1894 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1895 "Bitmap operations should process at most this many bits " \ 1896 "between yields") \ 1897 \ 1898 product(bool, CMSDumpAtPromotionFailure, false, \ 1899 "Dump useful information about the state of the CMS old " \ 1900 "generation upon a promotion failure") \ 1901 \ 1902 product(bool, CMSPrintChunksInDump, false, \ 1903 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1904 "more detailed information about the free chunks") \ 1905 \ 1906 product(bool, CMSPrintObjectsInDump, false, \ 1907 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1908 "more detailed information about the allocated objects") \ 1909 \ 1910 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1911 "Verify that all references across the FLS boundary " \ 1912 "are to valid objects") \ 1913 \ 1914 diagnostic(bool, FLSVerifyLists, false, \ 1915 "Do lots of (expensive) FreeListSpace verification") \ 1916 \ 1917 diagnostic(bool, FLSVerifyIndexTable, false, \ 1918 "Do lots of (expensive) FLS index table verification") \ 1919 \ 1920 develop(bool, FLSVerifyDictionary, false, \ 1921 "Do lots of (expensive) FLS dictionary verification") \ 1922 \ 1923 develop(bool, VerifyBlockOffsetArray, false, \ 1924 "Do (expensive) block offset array verification") \ 1925 \ 1926 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1927 "Maintain _unallocated_block in BlockOffsetArray " \ 1928 "(currently applicable only to CMS collector)") \ 1929 \ 1930 develop(bool, TraceCMSState, false, \ 1931 "Trace the state of the CMS collection") \ 1932 \ 1933 product(intx, RefDiscoveryPolicy, 0, \ 1934 "Select type of reference discovery policy: " \ 1935 "reference-based(0) or referent-based(1)") \ 1936 \ 1937 product(bool, ParallelRefProcEnabled, false, \ 1938 "Enable parallel reference processing whenever possible") \ 1939 \ 1940 product(bool, ParallelRefProcBalancingEnabled, true, \ 1941 "Enable balancing of reference processing queues") \ 1942 \ 1943 product(uintx, CMSTriggerRatio, 80, \ 1944 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1945 "allocated before a CMS collection cycle commences") \ 1946 \ 1947 product(uintx, CMSBootstrapOccupancy, 50, \ 1948 "Percentage CMS generation occupancy at which to " \ 1949 "initiate CMS collection for bootstrapping collection stats") \ 1950 \ 1951 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1952 "Percentage CMS generation occupancy to start a CMS collection " \ 1953 "cycle. A negative value means that CMSTriggerRatio is used") \ 1954 \ 1955 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1956 "Percentage of the (entire) heap occupancy to start a " \ 1957 "concurrent GC cycle. It is used by GCs that trigger a " \ 1958 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1959 "not just one of the generations (e.g., G1). A value of 0 " \ 1960 "denotes 'do constant GC cycles'.") \ 1961 \ 1962 manageable(intx, CMSTriggerInterval, -1, \ 1963 "Commence a CMS collection cycle (at least) every so many " \ 1964 "milliseconds (0 permanently, -1 disabled)") \ 1965 \ 1966 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1967 "Only use occupancy as a criterion for starting a CMS collection")\ 1968 \ 1969 product(uintx, CMSIsTooFullPercentage, 98, \ 1970 "An absolute ceiling above which CMS will always consider the " \ 1971 "unloading of classes when class unloading is enabled") \ 1972 \ 1973 develop(bool, CMSTestInFreeList, false, \ 1974 "Check if the coalesced range is already in the " \ 1975 "free lists as claimed") \ 1976 \ 1977 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1978 "Check that all the garbage collected was returned to the " \ 1979 "free lists") \ 1980 \ 1981 notproduct(bool, ScavengeALot, false, \ 1982 "Force scavenge at every Nth exit from the runtime system " \ 1983 "(N=ScavengeALotInterval)") \ 1984 \ 1985 develop(bool, FullGCALot, false, \ 1986 "Force full gc at every Nth exit from the runtime system " \ 1987 "(N=FullGCALotInterval)") \ 1988 \ 1989 notproduct(bool, GCALotAtAllSafepoints, false, \ 1990 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1991 \ 1992 product(bool, PrintPromotionFailure, false, \ 1993 "Print additional diagnostic information following " \ 1994 "promotion failure") \ 1995 \ 1996 notproduct(bool, PromotionFailureALot, false, \ 1997 "Use promotion failure handling on every youngest generation " \ 1998 "collection") \ 1999 \ 2000 develop(uintx, PromotionFailureALotCount, 1000, \ 2001 "Number of promotion failures occurring at ParGCAllocBuffer " \ 2002 "refill attempts (ParNew) or promotion attempts " \ 2003 "(other young collectors)") \ 2004 \ 2005 develop(uintx, PromotionFailureALotInterval, 5, \ 2006 "Total collections between promotion failures alot") \ 2007 \ 2008 experimental(uintx, WorkStealingSleepMillis, 1, \ 2009 "Sleep time when sleep is used for yields") \ 2010 \ 2011 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2012 "Number of yields before a sleep is done during workstealing") \ 2013 \ 2014 experimental(uintx, WorkStealingHardSpins, 4096, \ 2015 "Number of iterations in a spin loop between checks on " \ 2016 "time out of hard spin") \ 2017 \ 2018 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2019 "Ratio of hard spins to calls to yield") \ 2020 \ 2021 develop(uintx, ObjArrayMarkingStride, 512, \ 2022 "Number of object array elements to push onto the marking stack " \ 2023 "before pushing a continuation entry") \ 2024 \ 2025 develop(bool, MetadataAllocationFailALot, false, \ 2026 "Fail metadata allocations at intervals controlled by " \ 2027 "MetadataAllocationFailALotInterval") \ 2028 \ 2029 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2030 "Metadata allocation failure a lot interval") \ 2031 \ 2032 develop(bool, TraceMetadataChunkAllocation, false, \ 2033 "Trace chunk metadata allocations") \ 2034 \ 2035 product(bool, TraceMetadataHumongousAllocation, false, \ 2036 "Trace humongous metadata allocations") \ 2037 \ 2038 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2039 "Trace virtual space metadata allocations") \ 2040 \ 2041 notproduct(bool, ExecuteInternalVMTests, false, \ 2042 "Enable execution of internal VM tests") \ 2043 \ 2044 notproduct(bool, VerboseInternalVMTests, false, \ 2045 "Turn on logging for internal VM tests.") \ 2046 \ 2047 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2048 \ 2049 product_pd(bool, ResizeTLAB, \ 2050 "Dynamically resize TLAB size for threads") \ 2051 \ 2052 product(bool, ZeroTLAB, false, \ 2053 "Zero out the newly created TLAB") \ 2054 \ 2055 product(bool, FastTLABRefill, true, \ 2056 "Use fast TLAB refill code") \ 2057 \ 2058 product(bool, PrintTLAB, false, \ 2059 "Print various TLAB related information") \ 2060 \ 2061 product(bool, TLABStats, true, \ 2062 "Provide more detailed and expensive TLAB statistics " \ 2063 "(with PrintTLAB)") \ 2064 \ 2065 product_pd(bool, NeverActAsServerClassMachine, \ 2066 "Never act like a server-class machine") \ 2067 \ 2068 product(bool, AlwaysActAsServerClassMachine, false, \ 2069 "Always act like a server-class machine") \ 2070 \ 2071 product_pd(uint64_t, MaxRAM, \ 2072 "Real memory size (in bytes) used to set maximum heap size") \ 2073 \ 2074 product(bool, AggressiveHeap, false, \ 2075 "Optimize heap options for long-running memory intensive apps") \ 2076 \ 2077 product(uintx, ErgoHeapSizeLimit, 0, \ 2078 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2079 "MaxRAM * MaxRAMPercentage / 100") \ 2080 \ 2081 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2082 "Use CGroup memory limit as physical memory limit for heap " \ 2083 "sizing" \ 2084 "Deprecated, replaced by container support") \ 2085 \ 2086 diagnostic(bool, PrintContainerInfo, false, \ 2087 "Print container related information") \ 2088 \ 2089 diagnostic(bool, PrintActiveCpus, false, \ 2090 "Print the number of CPUs detected in os::active_processor_count") \ 2091 \ 2092 product(uintx, MaxRAMFraction, 4, \ 2093 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2094 "size") \ 2095 \ 2096 product(uintx, DefaultMaxRAMFraction, 4, \ 2097 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2098 "size; deprecated: to be renamed to MaxRAMFraction") \ 2099 \ 2100 product(uintx, MinRAMFraction, 2, \ 2101 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2102 "size on systems with small physical memory size") \ 2103 \ 2104 product(uintx, InitialRAMFraction, 64, \ 2105 "Fraction (1/n) of real memory used for initial heap size") \ 2106 \ 2107 product(double, MaxRAMPercentage, 25.0, \ 2108 "Maximum percentage of real memory used for maximum heap size") \ 2109 \ 2110 product(double, MinRAMPercentage, 50.0, \ 2111 "Minimum percentage of real memory used for maximum heap" \ 2112 "size on systems with small physical memory size") \ 2113 \ 2114 product(double, InitialRAMPercentage, 1.5625, \ 2115 "Percentage of real memory used for initial heap size") \ 2116 \ 2117 product(intx, ActiveProcessorCount, -1, \ 2118 "Specify the CPU count the VM should use and report as active") \ 2119 \ 2120 develop(uintx, MaxVirtMemFraction, 2, \ 2121 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2122 "determining maximum heap size") \ 2123 \ 2124 product(bool, UseAutoGCSelectPolicy, false, \ 2125 "Use automatic collection selection policy") \ 2126 \ 2127 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2128 "Automatic GC selection pause threshold in milliseconds") \ 2129 \ 2130 product(bool, UseAdaptiveSizePolicy, true, \ 2131 "Use adaptive generation sizing policies") \ 2132 \ 2133 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2134 "Use adaptive survivor sizing policies") \ 2135 \ 2136 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2137 "Use adaptive young-old sizing policies at minor collections") \ 2138 \ 2139 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2140 "Use adaptive young-old sizing policies at major collections") \ 2141 \ 2142 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2143 "Include statistics from System.gc() for adaptive size policy") \ 2144 \ 2145 product(bool, UseAdaptiveGCBoundary, false, \ 2146 "Allow young-old boundary to move") \ 2147 \ 2148 develop(bool, TraceAdaptiveGCBoundary, false, \ 2149 "Trace young-old boundary moves") \ 2150 \ 2151 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2152 "Resize the virtual spaces of the young or old generations") \ 2153 \ 2154 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2155 "Policy for changing generation size for throughput goals") \ 2156 \ 2157 product(uintx, AdaptiveSizePausePolicy, 0, \ 2158 "Policy for changing generation size for pause goals") \ 2159 \ 2160 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2161 "Adjust tenured generation to achieve a minor pause goal") \ 2162 \ 2163 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2164 "Adjust young generation to achieve a major pause goal") \ 2165 \ 2166 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2167 "Number of steps where heuristics is used before data is used") \ 2168 \ 2169 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2170 "Number of collections before the adaptive sizing is started") \ 2171 \ 2172 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2173 "Collection interval for printing information; zero means never") \ 2174 \ 2175 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2176 "Use adaptive minimum footprint as a goal") \ 2177 \ 2178 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2179 "Weight given to exponential resizing, between 0 and 100") \ 2180 \ 2181 product(uintx, AdaptiveTimeWeight, 25, \ 2182 "Weight given to time in adaptive policy, between 0 and 100") \ 2183 \ 2184 product(uintx, PausePadding, 1, \ 2185 "How much buffer to keep for pause time") \ 2186 \ 2187 product(uintx, PromotedPadding, 3, \ 2188 "How much buffer to keep for promotion failure") \ 2189 \ 2190 product(uintx, SurvivorPadding, 3, \ 2191 "How much buffer to keep for survivor overflow") \ 2192 \ 2193 product(uintx, ThresholdTolerance, 10, \ 2194 "Allowed collection cost difference between generations") \ 2195 \ 2196 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2197 "If collection costs are within margin, reduce both by full " \ 2198 "delta") \ 2199 \ 2200 product(uintx, YoungGenerationSizeIncrement, 20, \ 2201 "Adaptive size percentage change in young generation") \ 2202 \ 2203 product(uintx, YoungGenerationSizeSupplement, 80, \ 2204 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2205 \ 2206 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2207 "Decay factor to YoungedGenerationSizeSupplement") \ 2208 \ 2209 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2210 "Adaptive size percentage change in tenured generation") \ 2211 \ 2212 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2213 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2214 \ 2215 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2216 "Decay factor to TenuredGenerationSizeIncrement") \ 2217 \ 2218 product(uintx, MaxGCPauseMillis, max_uintx, \ 2219 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2220 "or (G1 Only) the maximum GC time per MMU time slice") \ 2221 \ 2222 product(uintx, GCPauseIntervalMillis, 0, \ 2223 "Time slice for MMU specification") \ 2224 \ 2225 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2226 "Adaptive size policy maximum GC minor pause time goal " \ 2227 "in millisecond") \ 2228 \ 2229 product(uintx, GCTimeRatio, 99, \ 2230 "Adaptive size policy application time to GC time ratio") \ 2231 \ 2232 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2233 "Adaptive size scale down factor for shrinking") \ 2234 \ 2235 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2236 "Adaptive size decays the major cost for long major intervals") \ 2237 \ 2238 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2239 "Time scale over which major costs decay") \ 2240 \ 2241 product(uintx, MinSurvivorRatio, 3, \ 2242 "Minimum ratio of young generation/survivor space size") \ 2243 \ 2244 product(uintx, InitialSurvivorRatio, 8, \ 2245 "Initial ratio of young generation/survivor space size") \ 2246 \ 2247 product(uintx, BaseFootPrintEstimate, 256*M, \ 2248 "Estimate of footprint other than Java Heap") \ 2249 \ 2250 product(bool, UseGCOverheadLimit, true, \ 2251 "Use policy to limit of proportion of time spent in GC " \ 2252 "before an OutOfMemory error is thrown") \ 2253 \ 2254 product(uintx, GCTimeLimit, 98, \ 2255 "Limit of the proportion of time spent in GC before " \ 2256 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2257 \ 2258 product(uintx, GCHeapFreeLimit, 2, \ 2259 "Minimum percentage of free space after a full GC before an " \ 2260 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2261 \ 2262 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2263 "Number of consecutive collections before gc time limit fires") \ 2264 \ 2265 product(bool, PrintAdaptiveSizePolicy, false, \ 2266 "Print information about AdaptiveSizePolicy") \ 2267 \ 2268 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2269 "How far ahead to prefetch destination area (<= 0 means off)") \ 2270 \ 2271 product(intx, PrefetchScanIntervalInBytes, -1, \ 2272 "How far ahead to prefetch scan area (<= 0 means off)") \ 2273 \ 2274 product(intx, PrefetchFieldsAhead, -1, \ 2275 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2276 \ 2277 diagnostic(bool, VerifySilently, false, \ 2278 "Do not print the verification progress") \ 2279 \ 2280 diagnostic(bool, VerifyDuringStartup, false, \ 2281 "Verify memory system before executing any Java code " \ 2282 "during VM initialization") \ 2283 \ 2284 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2285 "Verify system before exiting") \ 2286 \ 2287 diagnostic(bool, VerifyBeforeGC, false, \ 2288 "Verify memory system before GC") \ 2289 \ 2290 diagnostic(bool, VerifyAfterGC, false, \ 2291 "Verify memory system after GC") \ 2292 \ 2293 diagnostic(bool, VerifyDuringGC, false, \ 2294 "Verify memory system during GC (between phases)") \ 2295 \ 2296 diagnostic(ccstrlist, VerifySubSet, "", \ 2297 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2298 "are enabled. One or more sub-systems can be specified " \ 2299 "in a comma separated string. Sub-systems are: " \ 2300 "threads, heap, symbol_table, string_table, codecache, " \ 2301 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2302 "c-heap, codecache_oops") \ 2303 \ 2304 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2305 "Enable parallel memory system verification") \ 2306 \ 2307 diagnostic(bool, DeferInitialCardMark, false, \ 2308 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2309 "may arise from new_pre_store_barrier") \ 2310 \ 2311 diagnostic(bool, VerifyRememberedSets, false, \ 2312 "Verify GC remembered sets") \ 2313 \ 2314 diagnostic(bool, VerifyObjectStartArray, true, \ 2315 "Verify GC object start array if verify before/after") \ 2316 \ 2317 product(bool, DisableExplicitGC, false, \ 2318 "Ignore calls to System.gc()") \ 2319 \ 2320 notproduct(bool, CheckMemoryInitialization, false, \ 2321 "Check memory initialization") \ 2322 \ 2323 product(bool, CollectGen0First, false, \ 2324 "Collect youngest generation before each full GC") \ 2325 \ 2326 diagnostic(bool, BindCMSThreadToCPU, false, \ 2327 "Bind CMS Thread to CPU if possible") \ 2328 \ 2329 diagnostic(uintx, CPUForCMSThread, 0, \ 2330 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2331 \ 2332 product(bool, BindGCTaskThreadsToCPUs, false, \ 2333 "Bind GCTaskThreads to CPUs if possible") \ 2334 \ 2335 product(bool, UseGCTaskAffinity, false, \ 2336 "Use worker affinity when asking for GCTasks") \ 2337 \ 2338 product(uintx, ProcessDistributionStride, 4, \ 2339 "Stride through processors when distributing processes") \ 2340 \ 2341 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2342 "Number of times the coordinator GC thread will sleep while " \ 2343 "yielding before giving up and resuming GC") \ 2344 \ 2345 product(uintx, CMSYieldSleepCount, 0, \ 2346 "Number of times a GC thread (minus the coordinator) " \ 2347 "will sleep while yielding before giving up and resuming GC") \ 2348 \ 2349 /* gc tracing */ \ 2350 manageable(bool, PrintGC, false, \ 2351 "Print message at garbage collection") \ 2352 \ 2353 manageable(bool, PrintGCDetails, false, \ 2354 "Print more details at garbage collection") \ 2355 \ 2356 manageable(bool, PrintGCDateStamps, false, \ 2357 "Print date stamps at garbage collection") \ 2358 \ 2359 manageable(bool, PrintGCTimeStamps, false, \ 2360 "Print timestamps at garbage collection") \ 2361 \ 2362 manageable(bool, PrintGCID, false, \ 2363 "Print an identifier for each garbage collection") \ 2364 \ 2365 product(bool, PrintGCTaskTimeStamps, false, \ 2366 "Print timestamps for individual gc worker thread tasks") \ 2367 \ 2368 develop(intx, ConcGCYieldTimeout, 0, \ 2369 "If non-zero, assert that GC threads yield within this " \ 2370 "number of milliseconds") \ 2371 \ 2372 notproduct(bool, TraceMarkSweep, false, \ 2373 "Trace mark sweep") \ 2374 \ 2375 product(bool, PrintReferenceGC, false, \ 2376 "Print times spent handling reference objects during GC " \ 2377 "(enabled only when PrintGCDetails)") \ 2378 \ 2379 develop(bool, TraceReferenceGC, false, \ 2380 "Trace handling of soft/weak/final/phantom references") \ 2381 \ 2382 develop(bool, TraceFinalizerRegistration, false, \ 2383 "Trace registration of final references") \ 2384 \ 2385 notproduct(bool, TraceScavenge, false, \ 2386 "Trace scavenge") \ 2387 \ 2388 product(bool, IgnoreEmptyClassPaths, false, \ 2389 "Ignore empty path elements in -classpath") \ 2390 \ 2391 product(bool, TraceClassPaths, false, \ 2392 "Trace processing of class paths") \ 2393 \ 2394 product_rw(bool, TraceClassLoading, false, \ 2395 "Trace all classes loaded") \ 2396 \ 2397 product(bool, TraceClassLoadingPreorder, false, \ 2398 "Trace all classes loaded in order referenced (not loaded)") \ 2399 \ 2400 product_rw(bool, TraceClassUnloading, false, \ 2401 "Trace unloading of classes") \ 2402 \ 2403 product_rw(bool, TraceLoaderConstraints, false, \ 2404 "Trace loader constraints") \ 2405 \ 2406 develop(bool, TraceClassLoaderData, false, \ 2407 "Trace class loader loader_data lifetime") \ 2408 \ 2409 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2410 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2411 "Initial size of the boot class loader data metaspace") \ 2412 \ 2413 product(bool, TraceGen0Time, false, \ 2414 "Trace accumulated time for Gen 0 collection") \ 2415 \ 2416 product(bool, TraceGen1Time, false, \ 2417 "Trace accumulated time for Gen 1 collection") \ 2418 \ 2419 product(bool, PrintTenuringDistribution, false, \ 2420 "Print tenuring age information") \ 2421 \ 2422 product_rw(bool, PrintHeapAtGC, false, \ 2423 "Print heap layout before and after each GC") \ 2424 \ 2425 product_rw(bool, PrintHeapAtGCExtended, false, \ 2426 "Print extended information about the layout of the heap " \ 2427 "when -XX:+PrintHeapAtGC is set") \ 2428 \ 2429 product(bool, PrintHeapAtSIGBREAK, true, \ 2430 "Print heap layout in response to SIGBREAK") \ 2431 \ 2432 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2433 "Print a class histogram before any major stop-world GC") \ 2434 \ 2435 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2436 "Print a class histogram after any major stop-world GC") \ 2437 \ 2438 manageable(bool, PrintClassHistogram, false, \ 2439 "Print a histogram of class instances") \ 2440 \ 2441 develop(bool, TraceWorkGang, false, \ 2442 "Trace activities of work gangs") \ 2443 \ 2444 product(bool, TraceParallelOldGCTasks, false, \ 2445 "Trace multithreaded GC activity") \ 2446 \ 2447 develop(bool, TraceBlockOffsetTable, false, \ 2448 "Print BlockOffsetTable maps") \ 2449 \ 2450 develop(bool, TraceCardTableModRefBS, false, \ 2451 "Print CardTableModRefBS maps") \ 2452 \ 2453 develop(bool, TraceGCTaskManager, false, \ 2454 "Trace actions of the GC task manager") \ 2455 \ 2456 develop(bool, TraceGCTaskQueue, false, \ 2457 "Trace actions of the GC task queues") \ 2458 \ 2459 diagnostic(bool, TraceGCTaskThread, false, \ 2460 "Trace actions of the GC task threads") \ 2461 \ 2462 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2463 "Print the time taken by each phase in ParallelOldGC " \ 2464 "(PrintGCDetails must also be enabled)") \ 2465 \ 2466 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2467 "Trace marking phase in ParallelOldGC") \ 2468 \ 2469 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2470 "Trace summary phase in ParallelOldGC") \ 2471 \ 2472 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2473 "Trace compaction phase in ParallelOldGC") \ 2474 \ 2475 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2476 "Trace dense prefix computation for ParallelOldGC") \ 2477 \ 2478 develop(bool, IgnoreLibthreadGPFault, false, \ 2479 "Suppress workaround for libthread GP fault") \ 2480 \ 2481 product(bool, PrintJNIGCStalls, false, \ 2482 "Print diagnostic message when GC is stalled " \ 2483 "by JNI critical section") \ 2484 \ 2485 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2486 "The percentage of the used heap that the instances of a class " \ 2487 "must occupy for the class to generate a trace event") \ 2488 \ 2489 /* GC log rotation setting */ \ 2490 \ 2491 product(bool, UseGCLogFileRotation, false, \ 2492 "Rotate gclog files (for long running applications). It requires "\ 2493 "-Xloggc:<filename>") \ 2494 \ 2495 product(uintx, NumberOfGCLogFiles, 0, \ 2496 "Number of gclog files in rotation " \ 2497 "(default: 0, no rotation)") \ 2498 \ 2499 product(uintx, GCLogFileSize, 8*K, \ 2500 "GC log file size, requires UseGCLogFileRotation. " \ 2501 "Set to 0 to only trigger rotation via jcmd") \ 2502 \ 2503 /* JVMTI heap profiling */ \ 2504 \ 2505 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2506 "Trace JVMTI object tagging calls") \ 2507 \ 2508 diagnostic(bool, VerifyBeforeIteration, false, \ 2509 "Verify memory system before JVMTI iteration") \ 2510 \ 2511 /* compiler interface */ \ 2512 \ 2513 develop(bool, CIPrintCompilerName, false, \ 2514 "when CIPrint is active, print the name of the active compiler") \ 2515 \ 2516 develop(bool, CIPrintCompileQueue, false, \ 2517 "display the contents of the compile queue whenever a " \ 2518 "compilation is enqueued") \ 2519 \ 2520 develop(bool, CIPrintRequests, false, \ 2521 "display every request for compilation") \ 2522 \ 2523 product(bool, CITime, false, \ 2524 "collect timing information for compilation") \ 2525 \ 2526 develop(bool, CITimeEach, false, \ 2527 "display timing information after each successful compilation") \ 2528 \ 2529 develop(bool, CICountOSR, false, \ 2530 "use a separate counter when assigning ids to osr compilations") \ 2531 \ 2532 develop(bool, CICompileNatives, true, \ 2533 "compile native methods if supported by the compiler") \ 2534 \ 2535 develop_pd(bool, CICompileOSR, \ 2536 "compile on stack replacement methods if supported by the " \ 2537 "compiler") \ 2538 \ 2539 develop(bool, CIPrintMethodCodes, false, \ 2540 "print method bytecodes of the compiled code") \ 2541 \ 2542 develop(bool, CIPrintTypeFlow, false, \ 2543 "print the results of ciTypeFlow analysis") \ 2544 \ 2545 develop(bool, CITraceTypeFlow, false, \ 2546 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2547 \ 2548 develop(intx, OSROnlyBCI, -1, \ 2549 "OSR only at this bci. Negative values mean exclude that bci") \ 2550 \ 2551 /* compiler */ \ 2552 \ 2553 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2554 "Number of compiler threads to run") \ 2555 \ 2556 product(intx, CompilationPolicyChoice, 0, \ 2557 "which compilation policy (0/1)") \ 2558 \ 2559 develop(bool, UseStackBanging, true, \ 2560 "use stack banging for stack overflow checks (required for " \ 2561 "proper StackOverflow handling; disable only to measure cost " \ 2562 "of stackbanging)") \ 2563 \ 2564 develop(bool, UseStrictFP, true, \ 2565 "use strict fp if modifier strictfp is set") \ 2566 \ 2567 develop(bool, GenerateSynchronizationCode, true, \ 2568 "generate locking/unlocking code for synchronized methods and " \ 2569 "monitors") \ 2570 \ 2571 develop(bool, GenerateCompilerNullChecks, true, \ 2572 "Generate explicit null checks for loads/stores/calls") \ 2573 \ 2574 develop(bool, GenerateRangeChecks, true, \ 2575 "Generate range checks for array accesses") \ 2576 \ 2577 develop_pd(bool, ImplicitNullChecks, \ 2578 "Generate code for implicit null checks") \ 2579 \ 2580 product_pd(bool, TrapBasedNullChecks, \ 2581 "Generate code for null checks that uses a cmp and trap " \ 2582 "instruction raising SIGTRAP. This is only used if an access to" \ 2583 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2584 "ImplicitNullChecks don't work (PPC64).") \ 2585 \ 2586 product(bool, PrintSafepointStatistics, false, \ 2587 "Print statistics about safepoint synchronization") \ 2588 \ 2589 product(intx, PrintSafepointStatisticsCount, 300, \ 2590 "Total number of safepoint statistics collected " \ 2591 "before printing them out") \ 2592 \ 2593 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2594 "Print safepoint statistics only when safepoint takes " \ 2595 "more than PrintSafepointSatisticsTimeout in millis") \ 2596 \ 2597 product(bool, TraceSafepointCleanupTime, false, \ 2598 "Print the break down of clean up tasks performed during " \ 2599 "safepoint") \ 2600 \ 2601 product(bool, Inline, true, \ 2602 "Enable inlining") \ 2603 \ 2604 product(bool, ClipInlining, true, \ 2605 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2606 \ 2607 develop(bool, UseCHA, true, \ 2608 "Enable CHA") \ 2609 \ 2610 product(bool, UseTypeProfile, true, \ 2611 "Check interpreter profile for historically monomorphic calls") \ 2612 \ 2613 notproduct(bool, TimeCompiler, false, \ 2614 "Time the compiler") \ 2615 \ 2616 diagnostic(bool, PrintInlining, false, \ 2617 "Print inlining optimizations") \ 2618 \ 2619 product(bool, UsePopCountInstruction, false, \ 2620 "Use population count instruction") \ 2621 \ 2622 develop(bool, EagerInitialization, false, \ 2623 "Eagerly initialize classes if possible") \ 2624 \ 2625 develop(bool, TraceMethodReplacement, false, \ 2626 "Print when methods are replaced do to recompilation") \ 2627 \ 2628 develop(bool, PrintMethodFlushing, false, \ 2629 "Print the nmethods being flushed") \ 2630 \ 2631 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2632 "print statistics about method flushing") \ 2633 \ 2634 develop(bool, UseRelocIndex, false, \ 2635 "Use an index to speed random access to relocations") \ 2636 \ 2637 develop(bool, StressCodeBuffers, false, \ 2638 "Exercise code buffer expansion and other rare state changes") \ 2639 \ 2640 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2641 "Generate extra debugging information for non-safepoints in " \ 2642 "nmethods") \ 2643 \ 2644 product(bool, PrintVMOptions, false, \ 2645 "Print flags that appeared on the command line") \ 2646 \ 2647 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2648 "Ignore unrecognized VM options") \ 2649 \ 2650 product(bool, PrintCommandLineFlags, false, \ 2651 "Print flags specified on command line or set by ergonomics") \ 2652 \ 2653 product(bool, PrintFlagsInitial, false, \ 2654 "Print all VM flags before argument processing and exit VM") \ 2655 \ 2656 product(bool, PrintFlagsFinal, false, \ 2657 "Print all VM flags after argument and ergonomic processing") \ 2658 \ 2659 notproduct(bool, PrintFlagsWithComments, false, \ 2660 "Print all VM flags with default values and descriptions and " \ 2661 "exit") \ 2662 \ 2663 diagnostic(bool, SerializeVMOutput, true, \ 2664 "Use a mutex to serialize output to tty and LogFile") \ 2665 \ 2666 diagnostic(bool, DisplayVMOutput, true, \ 2667 "Display all VM output on the tty, independently of LogVMOutput") \ 2668 \ 2669 diagnostic(bool, LogVMOutput, false, \ 2670 "Save VM output to LogFile") \ 2671 \ 2672 diagnostic(ccstr, LogFile, NULL, \ 2673 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2674 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2675 \ 2676 product(ccstr, ErrorFile, NULL, \ 2677 "If an error occurs, save the error data to this file " \ 2678 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2679 \ 2680 product(bool, DisplayVMOutputToStderr, false, \ 2681 "If DisplayVMOutput is true, display all VM output to stderr") \ 2682 \ 2683 product(bool, DisplayVMOutputToStdout, false, \ 2684 "If DisplayVMOutput is true, display all VM output to stdout") \ 2685 \ 2686 product(bool, UseHeavyMonitors, false, \ 2687 "use heavyweight instead of lightweight Java monitors") \ 2688 \ 2689 product(bool, PrintStringTableStatistics, false, \ 2690 "print statistics about the StringTable and SymbolTable") \ 2691 \ 2692 diagnostic(bool, VerifyStringTableAtExit, false, \ 2693 "verify StringTable contents at exit") \ 2694 \ 2695 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2696 "print histogram of the symbol table") \ 2697 \ 2698 notproduct(bool, ExitVMOnVerifyError, false, \ 2699 "standard exit from VM if bytecode verify error " \ 2700 "(only in debug mode)") \ 2701 \ 2702 notproduct(ccstr, AbortVMOnException, NULL, \ 2703 "Call fatal if this exception is thrown. Example: " \ 2704 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2705 \ 2706 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2707 "Call fatal if the exception pointed by AbortVMOnException " \ 2708 "has this message") \ 2709 \ 2710 develop(bool, DebugVtables, false, \ 2711 "add debugging code to vtable dispatch") \ 2712 \ 2713 develop(bool, PrintVtables, false, \ 2714 "print vtables when printing klass") \ 2715 \ 2716 notproduct(bool, PrintVtableStats, false, \ 2717 "print vtables stats at end of run") \ 2718 \ 2719 develop(bool, TraceCreateZombies, false, \ 2720 "trace creation of zombie nmethods") \ 2721 \ 2722 notproduct(bool, IgnoreLockingAssertions, false, \ 2723 "disable locking assertions (for speed)") \ 2724 \ 2725 product(bool, RangeCheckElimination, true, \ 2726 "Eliminate range checks") \ 2727 \ 2728 develop_pd(bool, UncommonNullCast, \ 2729 "track occurrences of null in casts; adjust compiler tactics") \ 2730 \ 2731 develop(bool, TypeProfileCasts, true, \ 2732 "treat casts like calls for purposes of type profiling") \ 2733 \ 2734 develop(bool, DelayCompilationDuringStartup, true, \ 2735 "Delay invoking the compiler until main application class is " \ 2736 "loaded") \ 2737 \ 2738 develop(bool, CompileTheWorld, false, \ 2739 "Compile all methods in all classes in bootstrap class path " \ 2740 "(stress test)") \ 2741 \ 2742 develop(bool, CompileTheWorldPreloadClasses, true, \ 2743 "Preload all classes used by a class before start loading") \ 2744 \ 2745 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2746 "Force a safepoint every n compiles so sweeper can keep up") \ 2747 \ 2748 develop(bool, FillDelaySlots, true, \ 2749 "Fill delay slots (on SPARC only)") \ 2750 \ 2751 develop(bool, TimeLivenessAnalysis, false, \ 2752 "Time computation of bytecode liveness analysis") \ 2753 \ 2754 develop(bool, TraceLivenessGen, false, \ 2755 "Trace the generation of liveness analysis information") \ 2756 \ 2757 notproduct(bool, TraceLivenessQuery, false, \ 2758 "Trace queries of liveness analysis information") \ 2759 \ 2760 notproduct(bool, CollectIndexSetStatistics, false, \ 2761 "Collect information about IndexSets") \ 2762 \ 2763 develop(bool, UseLoopSafepoints, true, \ 2764 "Generate Safepoint nodes in every loop") \ 2765 \ 2766 develop(intx, FastAllocateSizeLimit, 128*K, \ 2767 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2768 "Inline allocations larger than this in doublewords must go slow")\ 2769 \ 2770 product(bool, AggressiveOpts, false, \ 2771 "Enable aggressive optimizations - see arguments.cpp") \ 2772 \ 2773 product_pd(uintx, TypeProfileLevel, \ 2774 "=XYZ, with Z: Type profiling of arguments at call; " \ 2775 "Y: Type profiling of return value at call; " \ 2776 "X: Type profiling of parameters to methods; " \ 2777 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2778 \ 2779 product(intx, TypeProfileArgsLimit, 2, \ 2780 "max number of call arguments to consider for type profiling") \ 2781 \ 2782 product(intx, TypeProfileParmsLimit, 2, \ 2783 "max number of incoming parameters to consider for type profiling"\ 2784 ", -1 for all") \ 2785 \ 2786 /* statistics */ \ 2787 develop(bool, CountCompiledCalls, false, \ 2788 "Count method invocations") \ 2789 \ 2790 notproduct(bool, CountRuntimeCalls, false, \ 2791 "Count VM runtime calls") \ 2792 \ 2793 develop(bool, CountJNICalls, false, \ 2794 "Count jni method invocations") \ 2795 \ 2796 notproduct(bool, CountJVMCalls, false, \ 2797 "Count jvm method invocations") \ 2798 \ 2799 notproduct(bool, CountRemovableExceptions, false, \ 2800 "Count exceptions that could be replaced by branches due to " \ 2801 "inlining") \ 2802 \ 2803 notproduct(bool, ICMissHistogram, false, \ 2804 "Produce histogram of IC misses") \ 2805 \ 2806 notproduct(bool, PrintClassStatistics, false, \ 2807 "Print class statistics at end of run") \ 2808 \ 2809 notproduct(bool, PrintMethodStatistics, false, \ 2810 "Print method statistics at end of run") \ 2811 \ 2812 /* interpreter */ \ 2813 develop(bool, ClearInterpreterLocals, false, \ 2814 "Always clear local variables of interpreter activations upon " \ 2815 "entry") \ 2816 \ 2817 product_pd(bool, RewriteBytecodes, \ 2818 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2819 \ 2820 product_pd(bool, RewriteFrequentPairs, \ 2821 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2822 \ 2823 diagnostic(bool, PrintInterpreter, false, \ 2824 "Print the generated interpreter code") \ 2825 \ 2826 product(bool, UseInterpreter, true, \ 2827 "Use interpreter for non-compiled methods") \ 2828 \ 2829 develop(bool, UseFastSignatureHandlers, true, \ 2830 "Use fast signature handlers for native calls") \ 2831 \ 2832 product(bool, UseLoopCounter, true, \ 2833 "Increment invocation counter on backward branch") \ 2834 \ 2835 product(bool, UseFastEmptyMethods, true, \ 2836 "Use fast method entry code for empty methods") \ 2837 \ 2838 product(bool, UseFastAccessorMethods, true, \ 2839 "Use fast method entry code for accessor methods") \ 2840 \ 2841 product_pd(bool, UseOnStackReplacement, \ 2842 "Use on stack replacement, calls runtime if invoc. counter " \ 2843 "overflows in loop") \ 2844 \ 2845 notproduct(bool, TraceOnStackReplacement, false, \ 2846 "Trace on stack replacement") \ 2847 \ 2848 product_pd(bool, PreferInterpreterNativeStubs, \ 2849 "Use always interpreter stubs for native methods invoked via " \ 2850 "interpreter") \ 2851 \ 2852 develop(bool, CountBytecodes, false, \ 2853 "Count number of bytecodes executed") \ 2854 \ 2855 develop(bool, PrintBytecodeHistogram, false, \ 2856 "Print histogram of the executed bytecodes") \ 2857 \ 2858 develop(bool, PrintBytecodePairHistogram, false, \ 2859 "Print histogram of the executed bytecode pairs") \ 2860 \ 2861 diagnostic(bool, PrintSignatureHandlers, false, \ 2862 "Print code generated for native method signature handlers") \ 2863 \ 2864 develop(bool, VerifyOops, false, \ 2865 "Do plausibility checks for oops") \ 2866 \ 2867 develop(bool, CheckUnhandledOops, false, \ 2868 "Check for unhandled oops in VM code") \ 2869 \ 2870 develop(bool, VerifyJNIFields, trueInDebug, \ 2871 "Verify jfieldIDs for instance fields") \ 2872 \ 2873 notproduct(bool, VerifyJNIEnvThread, false, \ 2874 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2875 "from JNI") \ 2876 \ 2877 develop(bool, VerifyFPU, false, \ 2878 "Verify FPU state (check for NaN's, etc.)") \ 2879 \ 2880 develop(bool, VerifyThread, false, \ 2881 "Watch the thread register for corruption (SPARC only)") \ 2882 \ 2883 develop(bool, VerifyActivationFrameSize, false, \ 2884 "Verify that activation frame didn't become smaller than its " \ 2885 "minimal size") \ 2886 \ 2887 develop(bool, TraceFrequencyInlining, false, \ 2888 "Trace frequency based inlining") \ 2889 \ 2890 develop_pd(bool, InlineIntrinsics, \ 2891 "Inline intrinsics that can be statically resolved") \ 2892 \ 2893 product_pd(bool, ProfileInterpreter, \ 2894 "Profile at the bytecode level during interpretation") \ 2895 \ 2896 develop(bool, TraceProfileInterpreter, false, \ 2897 "Trace profiling at the bytecode level during interpretation. " \ 2898 "This outputs the profiling information collected to improve " \ 2899 "jit compilation.") \ 2900 \ 2901 develop_pd(bool, ProfileTraps, \ 2902 "Profile deoptimization traps at the bytecode level") \ 2903 \ 2904 product(intx, ProfileMaturityPercentage, 20, \ 2905 "number of method invocations/branches (expressed as % of " \ 2906 "CompileThreshold) before using the method's profile") \ 2907 \ 2908 develop(bool, PrintMethodData, false, \ 2909 "Print the results of +ProfileInterpreter at end of run") \ 2910 \ 2911 develop(bool, VerifyDataPointer, trueInDebug, \ 2912 "Verify the method data pointer during interpreter profiling") \ 2913 \ 2914 develop(bool, VerifyCompiledCode, false, \ 2915 "Include miscellaneous runtime verifications in nmethod code; " \ 2916 "default off because it disturbs nmethod size heuristics") \ 2917 \ 2918 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2919 "Manually make GC thread crash then dump java stack trace; " \ 2920 "Test only") \ 2921 \ 2922 /* compilation */ \ 2923 product(bool, UseCompiler, true, \ 2924 "Use Just-In-Time compilation") \ 2925 \ 2926 develop(bool, TraceCompilationPolicy, false, \ 2927 "Trace compilation policy") \ 2928 \ 2929 develop(bool, TimeCompilationPolicy, false, \ 2930 "Time the compilation policy") \ 2931 \ 2932 product(bool, UseCounterDecay, true, \ 2933 "Adjust recompilation counters") \ 2934 \ 2935 develop(intx, CounterHalfLifeTime, 30, \ 2936 "Half-life time of invocation counters (in seconds)") \ 2937 \ 2938 develop(intx, CounterDecayMinIntervalLength, 500, \ 2939 "The minimum interval (in milliseconds) between invocation of " \ 2940 "CounterDecay") \ 2941 \ 2942 product(bool, AlwaysCompileLoopMethods, false, \ 2943 "When using recompilation, never interpret methods " \ 2944 "containing loops") \ 2945 \ 2946 product(bool, DontCompileHugeMethods, true, \ 2947 "Do not compile methods > HugeMethodLimit") \ 2948 \ 2949 /* Bytecode escape analysis estimation. */ \ 2950 product(bool, EstimateArgEscape, true, \ 2951 "Analyze bytecodes to estimate escape state of arguments") \ 2952 \ 2953 product(intx, BCEATraceLevel, 0, \ 2954 "How much tracing to do of bytecode escape analysis estimates") \ 2955 \ 2956 product(intx, MaxBCEAEstimateLevel, 5, \ 2957 "Maximum number of nested calls that are analyzed by BC EA") \ 2958 \ 2959 product(intx, MaxBCEAEstimateSize, 150, \ 2960 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2961 \ 2962 product(intx, AllocatePrefetchStyle, 1, \ 2963 "0 = no prefetch, " \ 2964 "1 = prefetch instructions for each allocation, " \ 2965 "2 = use TLAB watermark to gate allocation prefetch, " \ 2966 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2967 \ 2968 product(intx, AllocatePrefetchDistance, -1, \ 2969 "Distance to prefetch ahead of allocation pointer") \ 2970 \ 2971 product(intx, AllocatePrefetchLines, 3, \ 2972 "Number of lines to prefetch ahead of array allocation pointer") \ 2973 \ 2974 product(intx, AllocateInstancePrefetchLines, 1, \ 2975 "Number of lines to prefetch ahead of instance allocation " \ 2976 "pointer") \ 2977 \ 2978 product(intx, AllocatePrefetchStepSize, 16, \ 2979 "Step size in bytes of sequential prefetch instructions") \ 2980 \ 2981 product(intx, AllocatePrefetchInstr, 0, \ 2982 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2983 \ 2984 /* deoptimization */ \ 2985 develop(bool, TraceDeoptimization, false, \ 2986 "Trace deoptimization") \ 2987 \ 2988 develop(bool, DebugDeoptimization, false, \ 2989 "Tracing various information while debugging deoptimization") \ 2990 \ 2991 product(intx, SelfDestructTimer, 0, \ 2992 "Will cause VM to terminate after a given time (in minutes) " \ 2993 "(0 means off)") \ 2994 \ 2995 product(intx, MaxJavaStackTraceDepth, 1024, \ 2996 "The maximum number of lines in the stack trace for Java " \ 2997 "exceptions (0 means all)") \ 2998 \ 2999 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3000 "Guarantee a safepoint (at least) every so many milliseconds " \ 3001 "(0 means none)")) \ 3002 \ 3003 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3004 "Guarantee a safepoint (at least) every so many milliseconds " \ 3005 "(0 means none)")) \ 3006 \ 3007 product(intx, SafepointTimeoutDelay, 10000, \ 3008 "Delay in milliseconds for option SafepointTimeout") \ 3009 \ 3010 product(intx, NmethodSweepFraction, 16, \ 3011 "Number of invocations of sweeper to cover all nmethods") \ 3012 \ 3013 product(intx, NmethodSweepCheckInterval, 5, \ 3014 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3015 \ 3016 product(intx, NmethodSweepActivity, 10, \ 3017 "Removes cold nmethods from code cache if > 0. Higher values " \ 3018 "result in more aggressive sweeping") \ 3019 \ 3020 notproduct(bool, LogSweeper, false, \ 3021 "Keep a ring buffer of sweeper activity") \ 3022 \ 3023 notproduct(intx, SweeperLogEntries, 1024, \ 3024 "Number of records in the ring buffer of sweeper activity") \ 3025 \ 3026 notproduct(intx, MemProfilingInterval, 500, \ 3027 "Time between each invocation of the MemProfiler") \ 3028 \ 3029 develop(intx, MallocCatchPtr, -1, \ 3030 "Hit breakpoint when mallocing/freeing this pointer") \ 3031 \ 3032 notproduct(intx, AssertRepeat, 1, \ 3033 "number of times to evaluate expression in assert " \ 3034 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3035 \ 3036 notproduct(ccstrlist, SuppressErrorAt, "", \ 3037 "List of assertions (file:line) to muzzle") \ 3038 \ 3039 notproduct(uintx, HandleAllocationLimit, 1024, \ 3040 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3041 "is used") \ 3042 \ 3043 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3044 "Threshold for total handle allocation when " \ 3045 "+TraceHandleAllocation is used") \ 3046 \ 3047 develop(intx, StackPrintLimit, 100, \ 3048 "number of stack frames to print in VM-level stack dump") \ 3049 \ 3050 notproduct(intx, MaxElementPrintSize, 256, \ 3051 "maximum number of elements to print") \ 3052 \ 3053 notproduct(intx, MaxSubklassPrintSize, 4, \ 3054 "maximum number of subklasses to print when printing klass") \ 3055 \ 3056 product(intx, MaxInlineLevel, 9, \ 3057 "maximum number of nested calls that are inlined") \ 3058 \ 3059 product(intx, MaxRecursiveInlineLevel, 1, \ 3060 "maximum number of nested recursive calls that are inlined") \ 3061 \ 3062 develop(intx, MaxForceInlineLevel, 100, \ 3063 "maximum number of nested calls that are forced for inlining " \ 3064 "(using CompilerOracle or marked w/ @ForceInline)") \ 3065 \ 3066 product_pd(intx, InlineSmallCode, \ 3067 "Only inline already compiled methods if their code size is " \ 3068 "less than this") \ 3069 \ 3070 product(intx, MaxInlineSize, 35, \ 3071 "The maximum bytecode size of a method to be inlined") \ 3072 \ 3073 product_pd(intx, FreqInlineSize, \ 3074 "The maximum bytecode size of a frequent method to be inlined") \ 3075 \ 3076 product(intx, MaxTrivialSize, 6, \ 3077 "The maximum bytecode size of a trivial method to be inlined") \ 3078 \ 3079 product(intx, MinInliningThreshold, 250, \ 3080 "The minimum invocation count a method needs to have to be " \ 3081 "inlined") \ 3082 \ 3083 develop(intx, MethodHistogramCutoff, 100, \ 3084 "The cutoff value for method invocation histogram (+CountCalls)") \ 3085 \ 3086 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3087 "Number of interpreted methods to show in profile") \ 3088 \ 3089 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3090 "Number of compiled methods to show in profile") \ 3091 \ 3092 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3093 "Number of stub methods to show in profile") \ 3094 \ 3095 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3096 "Number of runtime stub nodes to show in profile") \ 3097 \ 3098 product(intx, ProfileIntervalsTicks, 100, \ 3099 "Number of ticks between printing of interval profile " \ 3100 "(+ProfileIntervals)") \ 3101 \ 3102 notproduct(intx, ScavengeALotInterval, 1, \ 3103 "Interval between which scavenge will occur with +ScavengeALot") \ 3104 \ 3105 notproduct(intx, FullGCALotInterval, 1, \ 3106 "Interval between which full gc will occur with +FullGCALot") \ 3107 \ 3108 notproduct(intx, FullGCALotStart, 0, \ 3109 "For which invocation to start FullGCAlot") \ 3110 \ 3111 notproduct(intx, FullGCALotDummies, 32*K, \ 3112 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3113 "to move") \ 3114 \ 3115 develop(intx, DontYieldALotInterval, 10, \ 3116 "Interval between which yields will be dropped (milliseconds)") \ 3117 \ 3118 develop(intx, MinSleepInterval, 1, \ 3119 "Minimum sleep() interval (milliseconds) when " \ 3120 "ConvertSleepToYield is off (used for Solaris)") \ 3121 \ 3122 develop(intx, ProfilerPCTickThreshold, 15, \ 3123 "Number of ticks in a PC buckets to be a hotspot") \ 3124 \ 3125 notproduct(intx, DeoptimizeALotInterval, 5, \ 3126 "Number of exits until DeoptimizeALot kicks in") \ 3127 \ 3128 notproduct(intx, ZombieALotInterval, 5, \ 3129 "Number of exits until ZombieALot kicks in") \ 3130 \ 3131 diagnostic(intx, MallocVerifyInterval, 0, \ 3132 "If non-zero, verify C heap after every N calls to " \ 3133 "malloc/realloc/free") \ 3134 \ 3135 diagnostic(intx, MallocVerifyStart, 0, \ 3136 "If non-zero, start verifying C heap after Nth call to " \ 3137 "malloc/realloc/free") \ 3138 \ 3139 diagnostic(uintx, MallocMaxTestWords, 0, \ 3140 "If non-zero, maximum number of words that malloc/realloc can " \ 3141 "allocate (for testing only)") \ 3142 \ 3143 product(intx, TypeProfileWidth, 2, \ 3144 "Number of receiver types to record in call/cast profile") \ 3145 \ 3146 develop(intx, BciProfileWidth, 2, \ 3147 "Number of return bci's to record in ret profile") \ 3148 \ 3149 product(intx, PerMethodRecompilationCutoff, 400, \ 3150 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3151 \ 3152 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3153 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3154 \ 3155 product(intx, PerMethodTrapLimit, 100, \ 3156 "Limit on traps (of one kind) in a method (includes inlines)") \ 3157 \ 3158 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3159 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3160 \ 3161 product(intx, PerBytecodeTrapLimit, 4, \ 3162 "Limit on traps (of one kind) at a particular BCI") \ 3163 \ 3164 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3165 "Extra method data trap entries for speculation") \ 3166 \ 3167 develop(intx, InlineFrequencyRatio, 20, \ 3168 "Ratio of call site execution to caller method invocation") \ 3169 \ 3170 develop_pd(intx, InlineFrequencyCount, \ 3171 "Count of call site execution necessary to trigger frequent " \ 3172 "inlining") \ 3173 \ 3174 develop(intx, InlineThrowCount, 50, \ 3175 "Force inlining of interpreted methods that throw this often") \ 3176 \ 3177 develop(intx, InlineThrowMaxSize, 200, \ 3178 "Force inlining of throwing methods smaller than this") \ 3179 \ 3180 develop(intx, ProfilerNodeSize, 1024, \ 3181 "Size in K to allocate for the Profile Nodes of each thread") \ 3182 \ 3183 product_pd(intx, PreInflateSpin, \ 3184 "Number of times to spin wait before inflation") \ 3185 \ 3186 /* gc parameters */ \ 3187 product(uintx, InitialHeapSize, 0, \ 3188 "Initial heap size (in bytes); zero means use ergonomics") \ 3189 \ 3190 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3191 "Maximum heap size (in bytes)") \ 3192 \ 3193 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3194 "Initial tenured generation size (in bytes)") \ 3195 \ 3196 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3197 "Initial new generation size (in bytes)") \ 3198 \ 3199 product(uintx, MaxNewSize, max_uintx, \ 3200 "Maximum new generation size (in bytes), max_uintx means set " \ 3201 "ergonomically") \ 3202 \ 3203 product(uintx, PretenureSizeThreshold, 0, \ 3204 "Maximum size in bytes of objects allocated in DefNew " \ 3205 "generation; zero means no maximum") \ 3206 \ 3207 product(uintx, TLABSize, 0, \ 3208 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3209 \ 3210 product(uintx, MinTLABSize, 2*K, \ 3211 "Minimum allowed TLAB size (in bytes)") \ 3212 \ 3213 product(uintx, TLABAllocationWeight, 35, \ 3214 "Allocation averaging weight") \ 3215 \ 3216 product(uintx, TLABWasteTargetPercent, 1, \ 3217 "Percentage of Eden that can be wasted") \ 3218 \ 3219 product(uintx, TLABRefillWasteFraction, 64, \ 3220 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3221 \ 3222 product(uintx, TLABWasteIncrement, 4, \ 3223 "Increment allowed waste at slow allocation") \ 3224 \ 3225 product(uintx, SurvivorRatio, 8, \ 3226 "Ratio of eden/survivor space size") \ 3227 \ 3228 product(uintx, NewRatio, 2, \ 3229 "Ratio of old/new generation sizes") \ 3230 \ 3231 product_pd(uintx, NewSizeThreadIncrease, \ 3232 "Additional size added to desired new generation size per " \ 3233 "non-daemon thread (in bytes)") \ 3234 \ 3235 product_pd(uintx, MetaspaceSize, \ 3236 "Initial size of Metaspaces (in bytes)") \ 3237 \ 3238 product(uintx, MaxMetaspaceSize, max_uintx, \ 3239 "Maximum size of Metaspaces (in bytes)") \ 3240 \ 3241 product(uintx, CompressedClassSpaceSize, 1*G, \ 3242 "Maximum size of class area in Metaspace when compressed " \ 3243 "class pointers are used") \ 3244 \ 3245 manageable(uintx, MinHeapFreeRatio, 40, \ 3246 "The minimum percentage of heap free after GC to avoid expansion."\ 3247 " For most GCs this applies to the old generation. In G1 and" \ 3248 " ParallelGC it applies to the whole heap.") \ 3249 \ 3250 manageable(uintx, MaxHeapFreeRatio, 70, \ 3251 "The maximum percentage of heap free after GC to avoid shrinking."\ 3252 " For most GCs this applies to the old generation. In G1 and" \ 3253 " ParallelGC it applies to the whole heap.") \ 3254 \ 3255 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3256 "Number of milliseconds per MB of free space in the heap") \ 3257 \ 3258 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3259 "The minimum change in heap space due to GC (in bytes)") \ 3260 \ 3261 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3262 "The minimum expansion of Metaspace (in bytes)") \ 3263 \ 3264 product(uintx, MinMetaspaceFreeRatio, 40, \ 3265 "The minimum percentage of Metaspace free after GC to avoid " \ 3266 "expansion") \ 3267 \ 3268 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3269 "The maximum percentage of Metaspace free after GC to avoid " \ 3270 "shrinking") \ 3271 \ 3272 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3273 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3274 \ 3275 product(uintx, QueuedAllocationWarningCount, 0, \ 3276 "Number of times an allocation that queues behind a GC " \ 3277 "will retry before printing a warning") \ 3278 \ 3279 diagnostic(uintx, VerifyGCStartAt, 0, \ 3280 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3281 \ 3282 diagnostic(intx, VerifyGCLevel, 0, \ 3283 "Generation level at which to start +VerifyBefore/AfterGC") \ 3284 \ 3285 product(uintx, MaxTenuringThreshold, 15, \ 3286 "Maximum value for tenuring threshold") \ 3287 \ 3288 product(uintx, InitialTenuringThreshold, 7, \ 3289 "Initial value for tenuring threshold") \ 3290 \ 3291 product(uintx, TargetSurvivorRatio, 50, \ 3292 "Desired percentage of survivor space used after scavenge") \ 3293 \ 3294 product(uintx, MarkSweepDeadRatio, 5, \ 3295 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3296 "Serial mark sweep treats this as both the minimum and maximum " \ 3297 "value. " \ 3298 "CMS uses this value only if it falls back to mark sweep. " \ 3299 "Par compact uses a variable scale based on the density of the " \ 3300 "generation and treats this as the maximum value when the heap " \ 3301 "is either completely full or completely empty. Par compact " \ 3302 "also has a smaller default value; see arguments.cpp.") \ 3303 \ 3304 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3305 "How often should we fully compact the heap (ignoring the dead " \ 3306 "space parameters)") \ 3307 \ 3308 product(intx, PrintCMSStatistics, 0, \ 3309 "Statistics for CMS") \ 3310 \ 3311 product(bool, PrintCMSInitiationStatistics, false, \ 3312 "Statistics for initiating a CMS collection") \ 3313 \ 3314 product(intx, PrintFLSStatistics, 0, \ 3315 "Statistics for CMS' FreeListSpace") \ 3316 \ 3317 product(intx, PrintFLSCensus, 0, \ 3318 "Census for CMS' FreeListSpace") \ 3319 \ 3320 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3321 "Delay between expansion and allocation (in milliseconds)") \ 3322 \ 3323 develop(uintx, GCWorkerDelayMillis, 0, \ 3324 "Delay in scheduling GC workers (in milliseconds)") \ 3325 \ 3326 product(intx, DeferThrSuspendLoopCount, 4000, \ 3327 "(Unstable) Number of times to iterate in safepoint loop " \ 3328 "before blocking VM threads ") \ 3329 \ 3330 product(intx, DeferPollingPageLoopCount, -1, \ 3331 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3332 "before changing safepoint polling page to RO ") \ 3333 \ 3334 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3335 \ 3336 product(bool, PSChunkLargeArrays, true, \ 3337 "Process large arrays in chunks") \ 3338 \ 3339 product(uintx, GCDrainStackTargetSize, 64, \ 3340 "Number of entries we will try to leave on the stack " \ 3341 "during parallel gc") \ 3342 \ 3343 /* stack parameters */ \ 3344 product_pd(intx, StackYellowPages, \ 3345 "Number of yellow zone (recoverable overflows) pages") \ 3346 \ 3347 product_pd(intx, StackRedPages, \ 3348 "Number of red zone (unrecoverable overflows) pages") \ 3349 \ 3350 product_pd(intx, StackShadowPages, \ 3351 "Number of shadow zone (for overflow checking) pages " \ 3352 "this should exceed the depth of the VM and native call stack") \ 3353 \ 3354 product_pd(intx, ThreadStackSize, \ 3355 "Thread Stack Size (in Kbytes)") \ 3356 \ 3357 product_pd(intx, VMThreadStackSize, \ 3358 "Non-Java Thread Stack Size (in Kbytes)") \ 3359 \ 3360 product_pd(intx, CompilerThreadStackSize, \ 3361 "Compiler Thread Stack Size (in Kbytes)") \ 3362 \ 3363 develop_pd(uintx, JVMInvokeMethodSlack, \ 3364 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3365 \ 3366 product(uintx, ThreadSafetyMargin, 50*M, \ 3367 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3368 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3369 "disable this feature") \ 3370 \ 3371 /* code cache parameters */ \ 3372 /* ppc64 has large code-entry alignment. */ \ 3373 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \ 3374 "Code cache segment size (in bytes) - smallest unit of " \ 3375 "allocation") \ 3376 \ 3377 develop_pd(intx, CodeEntryAlignment, \ 3378 "Code entry alignment for generated code (in bytes)") \ 3379 \ 3380 product_pd(intx, OptoLoopAlignment, \ 3381 "Align inner loops to zero relative to this modulus") \ 3382 \ 3383 product_pd(uintx, InitialCodeCacheSize, \ 3384 "Initial code cache size (in bytes)") \ 3385 \ 3386 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3387 "Minimum code cache size (in bytes) required to start VM.") \ 3388 \ 3389 product_pd(uintx, ReservedCodeCacheSize, \ 3390 "Reserved code cache size (in bytes) - maximum code cache size") \ 3391 \ 3392 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3393 "When less than X space left, we stop compiling") \ 3394 \ 3395 product_pd(uintx, CodeCacheExpansionSize, \ 3396 "Code cache expansion size (in bytes)") \ 3397 \ 3398 develop_pd(uintx, CodeCacheMinBlockLength, \ 3399 "Minimum number of segments in a code cache block") \ 3400 \ 3401 notproduct(bool, ExitOnFullCodeCache, false, \ 3402 "Exit the VM if we fill the code cache") \ 3403 \ 3404 product(bool, UseCodeCacheFlushing, true, \ 3405 "Remove cold/old nmethods from the code cache") \ 3406 \ 3407 /* interpreter debugging */ \ 3408 develop(intx, BinarySwitchThreshold, 5, \ 3409 "Minimal number of lookupswitch entries for rewriting to binary " \ 3410 "switch") \ 3411 \ 3412 develop(intx, StopInterpreterAt, 0, \ 3413 "Stop interpreter execution at specified bytecode number") \ 3414 \ 3415 develop(intx, TraceBytecodesAt, 0, \ 3416 "Trace bytecodes starting with specified bytecode number") \ 3417 \ 3418 /* compiler interface */ \ 3419 develop(intx, CIStart, 0, \ 3420 "The id of the first compilation to permit") \ 3421 \ 3422 develop(intx, CIStop, max_jint, \ 3423 "The id of the last compilation to permit") \ 3424 \ 3425 develop(intx, CIStartOSR, 0, \ 3426 "The id of the first osr compilation to permit " \ 3427 "(CICountOSR must be on)") \ 3428 \ 3429 develop(intx, CIStopOSR, max_jint, \ 3430 "The id of the last osr compilation to permit " \ 3431 "(CICountOSR must be on)") \ 3432 \ 3433 develop(intx, CIBreakAtOSR, -1, \ 3434 "The id of osr compilation to break at") \ 3435 \ 3436 develop(intx, CIBreakAt, -1, \ 3437 "The id of compilation to break at") \ 3438 \ 3439 product(ccstrlist, CompileOnly, "", \ 3440 "List of methods (pkg/class.name) to restrict compilation to") \ 3441 \ 3442 product(ccstr, CompileCommandFile, NULL, \ 3443 "Read compiler commands from this file [.hotspot_compiler]") \ 3444 \ 3445 product(ccstrlist, CompileCommand, "", \ 3446 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3447 \ 3448 develop(bool, ReplayCompiles, false, \ 3449 "Enable replay of compilations from ReplayDataFile") \ 3450 \ 3451 product(ccstr, ReplayDataFile, NULL, \ 3452 "File containing compilation replay information" \ 3453 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3454 \ 3455 product(ccstr, InlineDataFile, NULL, \ 3456 "File containing inlining replay information" \ 3457 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3458 \ 3459 develop(intx, ReplaySuppressInitializers, 2, \ 3460 "Control handling of class initialization during replay: " \ 3461 "0 - don't do anything special; " \ 3462 "1 - treat all class initializers as empty; " \ 3463 "2 - treat class initializers for application classes as empty; " \ 3464 "3 - allow all class initializers to run during bootstrap but " \ 3465 " pretend they are empty after starting replay") \ 3466 \ 3467 develop(bool, ReplayIgnoreInitErrors, false, \ 3468 "Ignore exceptions thrown during initialization for replay") \ 3469 \ 3470 product(bool, DumpReplayDataOnError, true, \ 3471 "Record replay data for crashing compiler threads") \ 3472 \ 3473 product(bool, CICompilerCountPerCPU, false, \ 3474 "1 compiler thread for log(N CPUs)") \ 3475 \ 3476 develop(intx, CIFireOOMAt, -1, \ 3477 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3478 "(non-negative value throws OOM after this many CI accesses " \ 3479 "in each compile)") \ 3480 notproduct(intx, CICrashAt, -1, \ 3481 "id of compilation to trigger assert in compiler thread for " \ 3482 "the purpose of testing, e.g. generation of replay data") \ 3483 notproduct(bool, CIObjectFactoryVerify, false, \ 3484 "enable potentially expensive verification in ciObjectFactory") \ 3485 \ 3486 /* Priorities */ \ 3487 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3488 \ 3489 product(intx, ThreadPriorityPolicy, 0, \ 3490 "0 : Normal. "\ 3491 " VM chooses priorities that are appropriate for normal "\ 3492 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3493 " to normal native priority. Java priorities below " \ 3494 " NORM_PRIORITY map to lower native priority values. On "\ 3495 " Windows applications are allowed to use higher native "\ 3496 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3497 " not use the highest possible native priority, "\ 3498 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3499 " system threads. On Linux thread priorities are ignored "\ 3500 " because the OS does not support static priority in "\ 3501 " SCHED_OTHER scheduling class which is the only choice for "\ 3502 " non-root, non-realtime applications. "\ 3503 "1 : Aggressive. "\ 3504 " Java thread priorities map over to the entire range of "\ 3505 " native thread priorities. Higher Java thread priorities map "\ 3506 " to higher native thread priorities. This policy should be "\ 3507 " used with care, as sometimes it can cause performance "\ 3508 " degradation in the application and/or the entire system. On "\ 3509 " Linux this policy requires root privilege.") \ 3510 \ 3511 product(bool, ThreadPriorityVerbose, false, \ 3512 "Print priority changes") \ 3513 \ 3514 product(intx, DefaultThreadPriority, -1, \ 3515 "The native priority at which threads run if not elsewhere " \ 3516 "specified (-1 means no change)") \ 3517 \ 3518 product(intx, CompilerThreadPriority, -1, \ 3519 "The native priority at which compiler threads should run " \ 3520 "(-1 means no change)") \ 3521 \ 3522 product(intx, VMThreadPriority, -1, \ 3523 "The native priority at which the VM thread should run " \ 3524 "(-1 means no change)") \ 3525 \ 3526 product(bool, CompilerThreadHintNoPreempt, true, \ 3527 "(Solaris only) Give compiler threads an extra quanta") \ 3528 \ 3529 product(bool, VMThreadHintNoPreempt, false, \ 3530 "(Solaris only) Give VM thread an extra quanta") \ 3531 \ 3532 product(intx, JavaPriority1_To_OSPriority, -1, \ 3533 "Map Java priorities to OS priorities") \ 3534 \ 3535 product(intx, JavaPriority2_To_OSPriority, -1, \ 3536 "Map Java priorities to OS priorities") \ 3537 \ 3538 product(intx, JavaPriority3_To_OSPriority, -1, \ 3539 "Map Java priorities to OS priorities") \ 3540 \ 3541 product(intx, JavaPriority4_To_OSPriority, -1, \ 3542 "Map Java priorities to OS priorities") \ 3543 \ 3544 product(intx, JavaPriority5_To_OSPriority, -1, \ 3545 "Map Java priorities to OS priorities") \ 3546 \ 3547 product(intx, JavaPriority6_To_OSPriority, -1, \ 3548 "Map Java priorities to OS priorities") \ 3549 \ 3550 product(intx, JavaPriority7_To_OSPriority, -1, \ 3551 "Map Java priorities to OS priorities") \ 3552 \ 3553 product(intx, JavaPriority8_To_OSPriority, -1, \ 3554 "Map Java priorities to OS priorities") \ 3555 \ 3556 product(intx, JavaPriority9_To_OSPriority, -1, \ 3557 "Map Java priorities to OS priorities") \ 3558 \ 3559 product(intx, JavaPriority10_To_OSPriority,-1, \ 3560 "Map Java priorities to OS priorities") \ 3561 \ 3562 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3563 "Java thread priority 10 maps to critical scheduling priority") \ 3564 \ 3565 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3566 "Compiler thread(s) run at critical scheduling priority") \ 3567 \ 3568 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3569 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3570 \ 3571 /* compiler debugging */ \ 3572 notproduct(intx, CompileTheWorldStartAt, 1, \ 3573 "First class to consider when using +CompileTheWorld") \ 3574 \ 3575 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3576 "Last class to consider when using +CompileTheWorld") \ 3577 \ 3578 develop(intx, NewCodeParameter, 0, \ 3579 "Testing Only: Create a dedicated integer parameter before " \ 3580 "putback") \ 3581 \ 3582 /* new oopmap storage allocation */ \ 3583 develop(intx, MinOopMapAllocation, 8, \ 3584 "Minimum number of OopMap entries in an OopMapSet") \ 3585 \ 3586 /* Background Compilation */ \ 3587 develop(intx, LongCompileThreshold, 50, \ 3588 "Used with +TraceLongCompiles") \ 3589 \ 3590 product(intx, StarvationMonitorInterval, 200, \ 3591 "Pause between each check (in milliseconds)") \ 3592 \ 3593 /* recompilation */ \ 3594 product_pd(intx, CompileThreshold, \ 3595 "number of interpreted method invocations before (re-)compiling") \ 3596 \ 3597 product_pd(intx, BackEdgeThreshold, \ 3598 "Interpreter Back edge threshold at which an OSR compilation is " \ 3599 "invoked") \ 3600 \ 3601 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3602 "Interpreter (tier 0) invocation notification frequency") \ 3603 \ 3604 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3605 "C1 without MDO (tier 2) invocation notification frequency") \ 3606 \ 3607 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3608 "C1 with MDO profiling (tier 3) invocation notification " \ 3609 "frequency") \ 3610 \ 3611 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3612 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3613 \ 3614 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3615 "Interpreter (tier 0) invocation notification frequency") \ 3616 \ 3617 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3618 "C1 without MDO (tier 2) invocation notification frequency") \ 3619 \ 3620 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3621 "C1 with MDO profiling (tier 3) invocation notification " \ 3622 "frequency") \ 3623 \ 3624 product(intx, Tier2CompileThreshold, 0, \ 3625 "threshold at which tier 2 compilation is invoked") \ 3626 \ 3627 product(intx, Tier2BackEdgeThreshold, 0, \ 3628 "Back edge threshold at which tier 2 compilation is invoked") \ 3629 \ 3630 product(intx, Tier3InvocationThreshold, 200, \ 3631 "Compile if number of method invocations crosses this " \ 3632 "threshold") \ 3633 \ 3634 product(intx, Tier3MinInvocationThreshold, 100, \ 3635 "Minimum invocation to compile at tier 3") \ 3636 \ 3637 product(intx, Tier3CompileThreshold, 2000, \ 3638 "Threshold at which tier 3 compilation is invoked (invocation " \ 3639 "minimum must be satisfied") \ 3640 \ 3641 product(intx, Tier3BackEdgeThreshold, 60000, \ 3642 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3643 \ 3644 product(intx, Tier4InvocationThreshold, 5000, \ 3645 "Compile if number of method invocations crosses this " \ 3646 "threshold") \ 3647 \ 3648 product(intx, Tier4MinInvocationThreshold, 600, \ 3649 "Minimum invocation to compile at tier 4") \ 3650 \ 3651 product(intx, Tier4CompileThreshold, 15000, \ 3652 "Threshold at which tier 4 compilation is invoked (invocation " \ 3653 "minimum must be satisfied") \ 3654 \ 3655 product(intx, Tier4BackEdgeThreshold, 40000, \ 3656 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3657 \ 3658 product(intx, Tier3DelayOn, 5, \ 3659 "If C2 queue size grows over this amount per compiler thread " \ 3660 "stop compiling at tier 3 and start compiling at tier 2") \ 3661 \ 3662 product(intx, Tier3DelayOff, 2, \ 3663 "If C2 queue size is less than this amount per compiler thread " \ 3664 "allow methods compiled at tier 2 transition to tier 3") \ 3665 \ 3666 product(intx, Tier3LoadFeedback, 5, \ 3667 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3668 "reaches this amount per compiler thread") \ 3669 \ 3670 product(intx, Tier4LoadFeedback, 3, \ 3671 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3672 "reaches this amount per compiler thread") \ 3673 \ 3674 product(intx, TieredCompileTaskTimeout, 50, \ 3675 "Kill compile task if method was not used within " \ 3676 "given timeout in milliseconds") \ 3677 \ 3678 product(intx, TieredStopAtLevel, 4, \ 3679 "Stop at given compilation level") \ 3680 \ 3681 product(intx, Tier0ProfilingStartPercentage, 200, \ 3682 "Start profiling in interpreter if the counters exceed tier 3 " \ 3683 "thresholds by the specified percentage") \ 3684 \ 3685 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3686 "Increase the compile threshold for C1 compilation if the code " \ 3687 "cache is filled by the specified percentage") \ 3688 \ 3689 product(intx, TieredRateUpdateMinTime, 1, \ 3690 "Minimum rate sampling interval (in milliseconds)") \ 3691 \ 3692 product(intx, TieredRateUpdateMaxTime, 25, \ 3693 "Maximum rate sampling interval (in milliseconds)") \ 3694 \ 3695 product_pd(bool, TieredCompilation, \ 3696 "Enable tiered compilation") \ 3697 \ 3698 product(bool, PrintTieredEvents, false, \ 3699 "Print tiered events notifications") \ 3700 \ 3701 product_pd(intx, OnStackReplacePercentage, \ 3702 "NON_TIERED number of method invocations/branches (expressed as " \ 3703 "% of CompileThreshold) before (re-)compiling OSR code") \ 3704 \ 3705 product(intx, InterpreterProfilePercentage, 33, \ 3706 "NON_TIERED number of method invocations/branches (expressed as " \ 3707 "% of CompileThreshold) before profiling in the interpreter") \ 3708 \ 3709 develop(intx, MaxRecompilationSearchLength, 10, \ 3710 "The maximum number of frames to inspect when searching for " \ 3711 "recompilee") \ 3712 \ 3713 develop(intx, MaxInterpretedSearchLength, 3, \ 3714 "The maximum number of interpreted frames to skip when searching "\ 3715 "for recompilee") \ 3716 \ 3717 develop(intx, DesiredMethodLimit, 8000, \ 3718 "The desired maximum method size (in bytecodes) after inlining") \ 3719 \ 3720 develop(intx, HugeMethodLimit, 8000, \ 3721 "Don't compile methods larger than this if " \ 3722 "+DontCompileHugeMethods") \ 3723 \ 3724 /* New JDK 1.4 reflection implementation */ \ 3725 \ 3726 develop(bool, UseNewReflection, true, \ 3727 "Temporary flag for transition to reflection based on dynamic " \ 3728 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3729 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3730 "changes were needed") \ 3731 \ 3732 develop(bool, VerifyReflectionBytecodes, false, \ 3733 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3734 "in situations like that described in 4486457 or for " \ 3735 "constructors generated for serialization, so can not be enabled "\ 3736 "in product.") \ 3737 \ 3738 product(bool, ReflectionWrapResolutionErrors, true, \ 3739 "Temporary flag for transition to AbstractMethodError wrapped " \ 3740 "in InvocationTargetException. See 6531596") \ 3741 \ 3742 develop(intx, FastSuperclassLimit, 8, \ 3743 "Depth of hardwired instanceof accelerator array") \ 3744 \ 3745 /* Properties for Java libraries */ \ 3746 \ 3747 product(uintx, MaxDirectMemorySize, 0, \ 3748 "Maximum total size of NIO direct-buffer allocations") \ 3749 \ 3750 /* temporary developer defined flags */ \ 3751 \ 3752 diagnostic(bool, UseNewCode, false, \ 3753 "Testing Only: Use the new version while testing") \ 3754 \ 3755 diagnostic(bool, UseNewCode2, false, \ 3756 "Testing Only: Use the new version while testing") \ 3757 \ 3758 diagnostic(bool, UseNewCode3, false, \ 3759 "Testing Only: Use the new version while testing") \ 3760 \ 3761 /* flags for performance data collection */ \ 3762 \ 3763 product(bool, UsePerfData, falseInEmbedded, \ 3764 "Flag to disable jvmstat instrumentation for performance testing "\ 3765 "and problem isolation purposes") \ 3766 \ 3767 product(bool, PerfDataSaveToFile, false, \ 3768 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3769 \ 3770 product(ccstr, PerfDataSaveFile, NULL, \ 3771 "Save PerfData memory to the specified absolute pathname. " \ 3772 "The string %p in the file name (if present) " \ 3773 "will be replaced by pid") \ 3774 \ 3775 product(intx, PerfDataSamplingInterval, 50, \ 3776 "Data sampling interval (in milliseconds)") \ 3777 \ 3778 develop(bool, PerfTraceDataCreation, false, \ 3779 "Trace creation of Performance Data Entries") \ 3780 \ 3781 develop(bool, PerfTraceMemOps, false, \ 3782 "Trace PerfMemory create/attach/detach calls") \ 3783 \ 3784 product(bool, PerfDisableSharedMem, false, \ 3785 "Store performance data in standard memory") \ 3786 \ 3787 product(intx, PerfDataMemorySize, 32*K, \ 3788 "Size of performance data memory region. Will be rounded " \ 3789 "up to a multiple of the native os page size.") \ 3790 \ 3791 product(intx, PerfMaxStringConstLength, 1024, \ 3792 "Maximum PerfStringConstant string length before truncation") \ 3793 \ 3794 product(bool, PerfAllowAtExitRegistration, false, \ 3795 "Allow registration of atexit() methods") \ 3796 \ 3797 product(bool, PerfBypassFileSystemCheck, false, \ 3798 "Bypass Win32 file system criteria checks (Windows Only)") \ 3799 \ 3800 product(intx, UnguardOnExecutionViolation, 0, \ 3801 "Unguard page and retry on no-execute fault (Win32 only) " \ 3802 "0=off, 1=conservative, 2=aggressive") \ 3803 \ 3804 /* Serviceability Support */ \ 3805 \ 3806 product(bool, ManagementServer, false, \ 3807 "Create JMX Management Server") \ 3808 \ 3809 product(bool, DisableAttachMechanism, false, \ 3810 "Disable mechanism that allows tools to attach to this VM") \ 3811 \ 3812 product(bool, StartAttachListener, false, \ 3813 "Always start Attach Listener at VM startup") \ 3814 \ 3815 manageable(bool, PrintConcurrentLocks, false, \ 3816 "Print java.util.concurrent locks in thread dump") \ 3817 \ 3818 product(bool, TransmitErrorReport, false, \ 3819 "Enable error report transmission on erroneous termination") \ 3820 \ 3821 product(ccstr, ErrorReportServer, NULL, \ 3822 "Override built-in error report server address") \ 3823 \ 3824 /* Shared spaces */ \ 3825 \ 3826 product(bool, UseSharedSpaces, true, \ 3827 "Use shared spaces for metadata") \ 3828 \ 3829 product(bool, VerifySharedSpaces, false, \ 3830 "Verify shared spaces (false for default archive, true for " \ 3831 "archive specified by -XX:SharedArchiveFile)") \ 3832 \ 3833 product(bool, RequireSharedSpaces, false, \ 3834 "Require shared spaces for metadata") \ 3835 \ 3836 product(bool, DumpSharedSpaces, false, \ 3837 "Special mode: JVM reads a class list, loads classes, builds " \ 3838 "shared spaces, and dumps the shared spaces to a file to be " \ 3839 "used in future JVM runs") \ 3840 \ 3841 product(bool, PrintSharedSpaces, false, \ 3842 "Print usage of shared spaces") \ 3843 \ 3844 product(bool, PrintSharedArchiveAndExit, false, \ 3845 "Print shared archive file contents") \ 3846 \ 3847 product(bool, PrintSharedDictionary, false, \ 3848 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3849 "dictionary") \ 3850 \ 3851 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3852 "Size of read-write space for metadata (in bytes)") \ 3853 \ 3854 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3855 "Size of read-only space for metadata (in bytes)") \ 3856 \ 3857 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3858 "Size of the shared miscellaneous data area (in bytes)") \ 3859 \ 3860 product(uintx, SharedMiscCodeSize, 120*K, \ 3861 "Size of the shared miscellaneous code area (in bytes)") \ 3862 \ 3863 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3864 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3865 "Address to allocate shared memory region for class data") \ 3866 \ 3867 diagnostic(bool, EnableInvokeDynamic, true, \ 3868 "support JSR 292 (method handles, invokedynamic, " \ 3869 "anonymous classes") \ 3870 \ 3871 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3872 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3873 "classes. Just exclude them from the shared dictionary.") \ 3874 \ 3875 diagnostic(bool, PrintMethodHandleStubs, false, \ 3876 "Print generated stub code for method handles") \ 3877 \ 3878 develop(bool, TraceMethodHandles, false, \ 3879 "trace internal method handle operations") \ 3880 \ 3881 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3882 "perform extra checks when constructing method handles") \ 3883 \ 3884 diagnostic(bool, ShowHiddenFrames, false, \ 3885 "show method handle implementation frames (usually hidden)") \ 3886 \ 3887 experimental(bool, TrustFinalNonStaticFields, false, \ 3888 "trust final non-static declarations for constant folding") \ 3889 \ 3890 diagnostic(bool, FoldStableValues, true, \ 3891 "Optimize loads from stable fields (marked w/ @Stable)") \ 3892 \ 3893 develop(bool, TraceInvokeDynamic, false, \ 3894 "trace internal invoke dynamic operations") \ 3895 \ 3896 diagnostic(bool, PauseAtStartup, false, \ 3897 "Causes the VM to pause at startup time and wait for the pause " \ 3898 "file to be removed (default: ./vm.paused.<pid>)") \ 3899 \ 3900 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3901 "The file to create and for whose removal to await when pausing " \ 3902 "at startup. (default: ./vm.paused.<pid>)") \ 3903 \ 3904 diagnostic(bool, PauseAtExit, false, \ 3905 "Pause and wait for keypress on exit if a debugger is attached") \ 3906 \ 3907 product(bool, ExtendedDTraceProbes, false, \ 3908 "Enable performance-impacting dtrace probes") \ 3909 \ 3910 product(bool, DTraceMethodProbes, false, \ 3911 "Enable dtrace probes for method-entry and method-exit") \ 3912 \ 3913 product(bool, DTraceAllocProbes, false, \ 3914 "Enable dtrace probes for object allocation") \ 3915 \ 3916 product(bool, DTraceMonitorProbes, false, \ 3917 "Enable dtrace probes for monitor events") \ 3918 \ 3919 product(bool, RelaxAccessControlCheck, false, \ 3920 "Relax the access control checks in the verifier") \ 3921 \ 3922 diagnostic(bool, PrintDTraceDOF, false, \ 3923 "Print the DTrace DOF passed to the system for JSDT probes") \ 3924 \ 3925 product(uintx, StringTableSize, defaultStringTableSize, \ 3926 "Number of buckets in the interned String table") \ 3927 \ 3928 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3929 "Number of buckets in the JVM internal Symbol table") \ 3930 \ 3931 product(bool, UseStringDeduplication, false, \ 3932 "Use string deduplication") \ 3933 \ 3934 product(bool, PrintStringDeduplicationStatistics, false, \ 3935 "Print string deduplication statistics") \ 3936 \ 3937 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3938 "A string must reach this age (or be promoted to an old region) " \ 3939 "to be considered for deduplication") \ 3940 \ 3941 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3942 "Force table resize every time the table is scanned") \ 3943 \ 3944 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3945 "Force table rehash every time the table is scanned") \ 3946 \ 3947 develop(bool, TraceDefaultMethods, false, \ 3948 "Trace the default method processing steps") \ 3949 \ 3950 develop(bool, VerifyGenericSignatures, false, \ 3951 "Abort VM on erroneous or inconsistent generic signatures") \ 3952 \ 3953 product(bool, UseVMInterruptibleIO, false, \ 3954 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3955 "EINTR for I/O operations results in OS_INTRPT. The default " \ 3956 "value of this flag is true for JDK 6 and earlier") \ 3957 \ 3958 diagnostic(bool, WhiteBoxAPI, false, \ 3959 "Enable internal testing APIs") \ 3960 \ 3961 product(bool, PrintGCCause, true, \ 3962 "Include GC cause in GC logging") \ 3963 \ 3964 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3965 "Default survivor space alignment in bytes") \ 3966 \ 3967 product(bool , AllowNonVirtualCalls, false, \ 3968 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3969 \ 3970 product(ccstr, DumpLoadedClassList, NULL, \ 3971 "Dump the names all loaded classes, that could be stored into " \ 3972 "the CDS archive, in the specified file") \ 3973 \ 3974 product(ccstr, SharedClassListFile, NULL, \ 3975 "Override the default CDS class list") \ 3976 \ 3977 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3978 "Override the default location of the CDS archive file") \ 3979 \ 3980 product(ccstr, ExtraSharedClassListFile, NULL, \ 3981 "Extra classlist for building the CDS archive file") \ 3982 \ 3983 experimental(uintx, ArrayAllocatorMallocLimit, \ 3984 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3985 "Allocation less than this value will be allocated " \ 3986 "using malloc. Larger allocations will use mmap.") \ 3987 \ 3988 product(bool, EnableTracing, false, \ 3989 "Enable event-based tracing") \ 3990 \ 3991 product(bool, UseLockedTracing, false, \ 3992 "Use locked-tracing when doing event-based tracing") \ 3993 \ 3994 product_pd(bool, PreserveFramePointer, \ 3995 "Use the FP register for holding the frame pointer " \ 3996 "and not as a general purpose register.") 3997 3998 /* 3999 * Macros for factoring of globals 4000 */ 4001 4002 // Interface macros 4003 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4004 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4005 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4006 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4007 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4008 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4009 #ifdef PRODUCT 4010 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4011 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4012 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4013 #else 4014 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4015 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4016 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4017 #endif 4018 // Special LP64 flags, product only needed for now. 4019 #ifdef _LP64 4020 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4021 #else 4022 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4023 #endif // _LP64 4024 4025 // Implementation macros 4026 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4027 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4028 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4029 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4030 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4031 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4032 #ifdef PRODUCT 4033 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4034 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4035 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4036 #else 4037 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4038 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4039 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4040 #endif 4041 #ifdef _LP64 4042 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4043 #else 4044 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4045 #endif // _LP64 4046 4047 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) 4048 4049 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4050 4051 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4052 4053 // Extensions 4054 4055 #include "runtime/globals_ext.hpp" 4056 4057 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP