1 /* 2 * Copyright (c) 1997, 2016, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 30 // use this for flags that are true per default in the tiered build 31 // but false in non-tiered builds, and vice versa 32 #ifdef TIERED 33 #define trueInTiered true 34 #define falseInTiered false 35 #else 36 #define trueInTiered false 37 #define falseInTiered true 38 #endif 39 40 #ifdef TARGET_ARCH_x86 41 # include "globals_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_sparc 44 # include "globals_sparc.hpp" 45 #endif 46 #ifdef TARGET_ARCH_zero 47 # include "globals_zero.hpp" 48 #endif 49 #ifdef TARGET_ARCH_arm 50 # include "globals_arm.hpp" 51 #endif 52 #ifdef TARGET_ARCH_ppc 53 # include "globals_ppc.hpp" 54 #endif 55 #ifdef TARGET_ARCH_aarch32 56 # include "globals_aarch32.hpp" 57 #endif 58 #ifdef TARGET_OS_FAMILY_linux 59 # include "globals_linux.hpp" 60 #endif 61 #ifdef TARGET_OS_FAMILY_solaris 62 # include "globals_solaris.hpp" 63 #endif 64 #ifdef TARGET_OS_FAMILY_windows 65 # include "globals_windows.hpp" 66 #endif 67 #ifdef TARGET_OS_FAMILY_aix 68 # include "globals_aix.hpp" 69 #endif 70 #ifdef TARGET_OS_FAMILY_bsd 71 # include "globals_bsd.hpp" 72 #endif 73 #ifdef TARGET_OS_ARCH_linux_x86 74 # include "globals_linux_x86.hpp" 75 #endif 76 #ifdef TARGET_OS_ARCH_linux_sparc 77 # include "globals_linux_sparc.hpp" 78 #endif 79 #ifdef TARGET_OS_ARCH_linux_zero 80 # include "globals_linux_zero.hpp" 81 #endif 82 #ifdef TARGET_OS_ARCH_linux_arm 83 # include "globals_linux_arm.hpp" 84 #endif 85 #ifdef TARGET_OS_ARCH_linux_ppc 86 # include "globals_linux_ppc.hpp" 87 #endif 88 #ifdef TARGET_OS_ARCH_linux_aarch32 89 # include "globals_linux_aarch32.hpp" 90 #endif 91 #ifdef TARGET_OS_ARCH_solaris_x86 92 # include "globals_solaris_x86.hpp" 93 #endif 94 #ifdef TARGET_OS_ARCH_solaris_sparc 95 # include "globals_solaris_sparc.hpp" 96 #endif 97 #ifdef TARGET_OS_ARCH_windows_x86 98 # include "globals_windows_x86.hpp" 99 #endif 100 #ifdef TARGET_OS_ARCH_aix_ppc 101 # include "globals_aix_ppc.hpp" 102 #endif 103 #ifdef TARGET_OS_ARCH_bsd_x86 104 # include "globals_bsd_x86.hpp" 105 #endif 106 #ifdef TARGET_OS_ARCH_bsd_zero 107 # include "globals_bsd_zero.hpp" 108 #endif 109 #ifdef COMPILER1 110 #ifdef TARGET_ARCH_x86 111 # include "c1_globals_x86.hpp" 112 #endif 113 #ifdef TARGET_ARCH_sparc 114 # include "c1_globals_sparc.hpp" 115 #endif 116 #ifdef TARGET_ARCH_arm 117 # include "c1_globals_arm.hpp" 118 #endif 119 #ifdef TARGET_ARCH_ppc 120 # include "c1_globals_ppc.hpp" 121 #endif 122 #ifdef TARGET_ARCH_aarch32 123 # include "c1_globals_aarch32.hpp" 124 #endif 125 #ifdef TARGET_OS_FAMILY_linux 126 # include "c1_globals_linux.hpp" 127 #endif 128 #ifdef TARGET_OS_FAMILY_solaris 129 # include "c1_globals_solaris.hpp" 130 #endif 131 #ifdef TARGET_OS_FAMILY_windows 132 # include "c1_globals_windows.hpp" 133 #endif 134 #ifdef TARGET_OS_FAMILY_aix 135 # include "c1_globals_aix.hpp" 136 #endif 137 #ifdef TARGET_OS_FAMILY_bsd 138 # include "c1_globals_bsd.hpp" 139 #endif 140 #endif 141 #ifdef COMPILER2 142 #ifdef TARGET_ARCH_x86 143 # include "c2_globals_x86.hpp" 144 #endif 145 #ifdef TARGET_ARCH_sparc 146 # include "c2_globals_sparc.hpp" 147 #endif 148 #ifdef TARGET_ARCH_arm 149 # include "c2_globals_arm.hpp" 150 #endif 151 #ifdef TARGET_ARCH_ppc 152 # include "c2_globals_ppc.hpp" 153 #endif 154 #ifdef TARGET_ARCH_aarch32 155 # include "c2_globals_aarch32.hpp" 156 #endif 157 #ifdef TARGET_OS_FAMILY_linux 158 # include "c2_globals_linux.hpp" 159 #endif 160 #ifdef TARGET_OS_FAMILY_solaris 161 # include "c2_globals_solaris.hpp" 162 #endif 163 #ifdef TARGET_OS_FAMILY_windows 164 # include "c2_globals_windows.hpp" 165 #endif 166 #ifdef TARGET_OS_FAMILY_aix 167 # include "c2_globals_aix.hpp" 168 #endif 169 #ifdef TARGET_OS_FAMILY_bsd 170 # include "c2_globals_bsd.hpp" 171 #endif 172 #endif 173 #ifdef SHARK 174 #ifdef TARGET_ARCH_zero 175 # include "shark_globals_zero.hpp" 176 #endif 177 #endif 178 179 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 180 define_pd_global(bool, BackgroundCompilation, false); 181 define_pd_global(bool, UseTLAB, false); 182 define_pd_global(bool, CICompileOSR, false); 183 define_pd_global(bool, UseTypeProfile, false); 184 define_pd_global(bool, UseOnStackReplacement, false); 185 define_pd_global(bool, InlineIntrinsics, false); 186 define_pd_global(bool, PreferInterpreterNativeStubs, true); 187 define_pd_global(bool, ProfileInterpreter, false); 188 define_pd_global(bool, ProfileTraps, false); 189 define_pd_global(bool, TieredCompilation, false); 190 191 define_pd_global(intx, CompileThreshold, 0); 192 define_pd_global(intx, BackEdgeThreshold, 0); 193 194 define_pd_global(intx, OnStackReplacePercentage, 0); 195 define_pd_global(bool, ResizeTLAB, false); 196 define_pd_global(intx, FreqInlineSize, 0); 197 define_pd_global(intx, NewSizeThreadIncrease, 4*K); 198 define_pd_global(intx, InlineClassNatives, true); 199 define_pd_global(intx, InlineUnsafeOps, true); 200 define_pd_global(intx, InitialCodeCacheSize, 160*K); 201 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 202 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 203 define_pd_global(intx, CodeCacheMinBlockLength, 1); 204 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 205 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 206 define_pd_global(bool, NeverActAsServerClassMachine, true); 207 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 208 #define CI_COMPILER_COUNT 0 209 #else 210 211 #ifdef COMPILER2 212 #define CI_COMPILER_COUNT 2 213 #else 214 #define CI_COMPILER_COUNT 1 215 #endif // COMPILER2 216 217 #endif // no compilers 218 219 // string type aliases used only in this file 220 typedef const char* ccstr; 221 typedef const char* ccstrlist; // represents string arguments which accumulate 222 223 struct Flag { 224 enum Flags { 225 // value origin 226 DEFAULT = 0, 227 COMMAND_LINE = 1, 228 ENVIRON_VAR = 2, 229 CONFIG_FILE = 3, 230 MANAGEMENT = 4, 231 ERGONOMIC = 5, 232 ATTACH_ON_DEMAND = 6, 233 INTERNAL = 7, 234 235 LAST_VALUE_ORIGIN = INTERNAL, 236 VALUE_ORIGIN_BITS = 4, 237 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 238 239 // flag kind 240 KIND_PRODUCT = 1 << 4, 241 KIND_MANAGEABLE = 1 << 5, 242 KIND_DIAGNOSTIC = 1 << 6, 243 KIND_EXPERIMENTAL = 1 << 7, 244 KIND_NOT_PRODUCT = 1 << 8, 245 KIND_DEVELOP = 1 << 9, 246 KIND_PLATFORM_DEPENDENT = 1 << 10, 247 KIND_READ_WRITE = 1 << 11, 248 KIND_C1 = 1 << 12, 249 KIND_C2 = 1 << 13, 250 KIND_ARCH = 1 << 14, 251 KIND_SHARK = 1 << 15, 252 KIND_LP64_PRODUCT = 1 << 16, 253 KIND_COMMERCIAL = 1 << 17, 254 255 KIND_MASK = ~VALUE_ORIGIN_MASK 256 }; 257 258 const char* _type; 259 const char* _name; 260 void* _addr; 261 NOT_PRODUCT(const char* _doc;) 262 Flags _flags; 263 264 // points to all Flags static array 265 static Flag* flags; 266 267 // number of flags 268 static size_t numFlags; 269 270 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 271 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 272 273 void check_writable(); 274 275 bool is_bool() const; 276 bool get_bool() const; 277 void set_bool(bool value); 278 279 bool is_intx() const; 280 intx get_intx() const; 281 void set_intx(intx value); 282 283 bool is_uintx() const; 284 uintx get_uintx() const; 285 void set_uintx(uintx value); 286 287 bool is_uint64_t() const; 288 uint64_t get_uint64_t() const; 289 void set_uint64_t(uint64_t value); 290 291 bool is_double() const; 292 double get_double() const; 293 void set_double(double value); 294 295 bool is_ccstr() const; 296 bool ccstr_accumulates() const; 297 ccstr get_ccstr() const; 298 void set_ccstr(ccstr value); 299 300 Flags get_origin(); 301 void set_origin(Flags origin); 302 303 bool is_default(); 304 bool is_ergonomic(); 305 bool is_command_line(); 306 307 bool is_product() const; 308 bool is_manageable() const; 309 bool is_diagnostic() const; 310 bool is_experimental() const; 311 bool is_notproduct() const; 312 bool is_develop() const; 313 bool is_read_write() const; 314 bool is_commercial() const; 315 316 bool is_constant_in_binary() const; 317 318 bool is_unlocker() const; 319 bool is_unlocked() const; 320 bool is_writeable() const; 321 bool is_external() const; 322 323 bool is_unlocker_ext() const; 324 bool is_unlocked_ext() const; 325 bool is_writeable_ext() const; 326 bool is_external_ext() const; 327 328 void unlock_diagnostic(); 329 330 void get_locked_message(char*, int) const; 331 void get_locked_message_ext(char*, int) const; 332 333 void print_on(outputStream* st, bool withComments = false ); 334 void print_kind(outputStream* st); 335 void print_as_flag(outputStream* st); 336 }; 337 338 // debug flags control various aspects of the VM and are global accessible 339 340 // use FlagSetting to temporarily change some debug flag 341 // e.g. FlagSetting fs(DebugThisAndThat, true); 342 // restored to previous value upon leaving scope 343 class FlagSetting { 344 bool val; 345 bool* flag; 346 public: 347 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 348 ~FlagSetting() { *flag = val; } 349 }; 350 351 352 class CounterSetting { 353 intx* counter; 354 public: 355 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 356 ~CounterSetting() { (*counter)--; } 357 }; 358 359 360 class UIntFlagSetting { 361 uintx val; 362 uintx* flag; 363 public: 364 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 365 ~UIntFlagSetting() { *flag = val; } 366 }; 367 368 369 class DoubleFlagSetting { 370 double val; 371 double* flag; 372 public: 373 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 374 ~DoubleFlagSetting() { *flag = val; } 375 }; 376 377 378 class CommandLineFlags { 379 public: 380 static bool boolAt(const char* name, size_t len, bool* value); 381 static bool boolAt(const char* name, bool* value) { return boolAt(name, strlen(name), value); } 382 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 383 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 384 385 static bool intxAt(const char* name, size_t len, intx* value); 386 static bool intxAt(const char* name, intx* value) { return intxAt(name, strlen(name), value); } 387 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 388 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 389 390 static bool uintxAt(const char* name, size_t len, uintx* value); 391 static bool uintxAt(const char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 392 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 393 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 394 395 static bool uint64_tAt(const char* name, size_t len, uint64_t* value); 396 static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 397 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 398 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 399 400 static bool doubleAt(const char* name, size_t len, double* value); 401 static bool doubleAt(const char* name, double* value) { return doubleAt(name, strlen(name), value); } 402 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 403 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 404 405 static bool ccstrAt(const char* name, size_t len, ccstr* value); 406 static bool ccstrAt(const char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 407 // Contract: Flag will make private copy of the incoming value. 408 // Outgoing value is always malloc-ed, and caller MUST call free. 409 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 410 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 411 412 // Returns false if name is not a command line flag. 413 static bool wasSetOnCmdline(const char* name, bool* value); 414 static void printSetFlags(outputStream* out); 415 416 static void printFlags(outputStream* out, bool withComments); 417 418 static void verify() PRODUCT_RETURN; 419 }; 420 421 // use this for flags that are true by default in the debug version but 422 // false in the optimized version, and vice versa 423 #ifdef ASSERT 424 #define trueInDebug true 425 #define falseInDebug false 426 #else 427 #define trueInDebug false 428 #define falseInDebug true 429 #endif 430 431 // use this for flags that are true per default in the product build 432 // but false in development builds, and vice versa 433 #ifdef PRODUCT 434 #define trueInProduct true 435 #define falseInProduct false 436 #else 437 #define trueInProduct false 438 #define falseInProduct true 439 #endif 440 441 #ifdef JAVASE_EMBEDDED 442 #define falseInEmbedded false 443 #else 444 #define falseInEmbedded true 445 #endif 446 447 // develop flags are settable / visible only during development and are constant in the PRODUCT version 448 // product flags are always settable / visible 449 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 450 451 // A flag must be declared with one of the following types: 452 // bool, intx, uintx, ccstr. 453 // The type "ccstr" is an alias for "const char*" and is used 454 // only in this file, because the macrology requires single-token type names. 455 456 // Note: Diagnostic options not meant for VM tuning or for product modes. 457 // They are to be used for VM quality assurance or field diagnosis 458 // of VM bugs. They are hidden so that users will not be encouraged to 459 // try them as if they were VM ordinary execution options. However, they 460 // are available in the product version of the VM. Under instruction 461 // from support engineers, VM customers can turn them on to collect 462 // diagnostic information about VM problems. To use a VM diagnostic 463 // option, you must first specify +UnlockDiagnosticVMOptions. 464 // (This master switch also affects the behavior of -Xprintflags.) 465 // 466 // experimental flags are in support of features that are not 467 // part of the officially supported product, but are available 468 // for experimenting with. They could, for example, be performance 469 // features that may not have undergone full or rigorous QA, but which may 470 // help performance in some cases and released for experimentation 471 // by the community of users and developers. This flag also allows one to 472 // be able to build a fully supported product that nonetheless also 473 // ships with some unsupported, lightly tested, experimental features. 474 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 475 // UnlockExperimentalVMOptions flag, which allows the control and 476 // modification of the experimental flags. 477 // 478 // Nota bene: neither diagnostic nor experimental options should be used casually, 479 // and they are not supported on production loads, except under explicit 480 // direction from support engineers. 481 // 482 // manageable flags are writeable external product flags. 483 // They are dynamically writeable through the JDK management interface 484 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 485 // These flags are external exported interface (see CCC). The list of 486 // manageable flags can be queried programmatically through the management 487 // interface. 488 // 489 // A flag can be made as "manageable" only if 490 // - the flag is defined in a CCC as an external exported interface. 491 // - the VM implementation supports dynamic setting of the flag. 492 // This implies that the VM must *always* query the flag variable 493 // and not reuse state related to the flag state at any given time. 494 // - you want the flag to be queried programmatically by the customers. 495 // 496 // product_rw flags are writeable internal product flags. 497 // They are like "manageable" flags but for internal/private use. 498 // The list of product_rw flags are internal/private flags which 499 // may be changed/removed in a future release. It can be set 500 // through the management interface to get/set value 501 // when the name of flag is supplied. 502 // 503 // A flag can be made as "product_rw" only if 504 // - the VM implementation supports dynamic setting of the flag. 505 // This implies that the VM must *always* query the flag variable 506 // and not reuse state related to the flag state at any given time. 507 // 508 // Note that when there is a need to support develop flags to be writeable, 509 // it can be done in the same way as product_rw. 510 511 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 512 \ 513 lp64_product(bool, UseCompressedOops, false, \ 514 "Use 32-bit object references in 64-bit VM. " \ 515 "lp64_product means flag is always constant in 32 bit VM") \ 516 \ 517 lp64_product(bool, UseCompressedClassPointers, false, \ 518 "Use 32-bit class pointers in 64-bit VM. " \ 519 "lp64_product means flag is always constant in 32 bit VM") \ 520 \ 521 notproduct(bool, CheckCompressedOops, true, \ 522 "Generate checks in encoding/decoding code in debug VM") \ 523 \ 524 product_pd(uintx, HeapBaseMinAddress, \ 525 "OS specific low limit for heap base address") \ 526 \ 527 diagnostic(bool, PrintCompressedOopsMode, false, \ 528 "Print compressed oops base address and encoding mode") \ 529 \ 530 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 531 "Default object alignment in bytes, 8 is minimum") \ 532 \ 533 product(bool, AssumeMP, false, \ 534 "Instruct the VM to assume multiple processors are available") \ 535 \ 536 /* UseMembar is theoretically a temp flag used for memory barrier \ 537 * removal testing. It was supposed to be removed before FCS but has \ 538 * been re-added (see 6401008) */ \ 539 product_pd(bool, UseMembar, \ 540 "(Unstable) Issues membars on thread state transitions") \ 541 \ 542 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 543 "Clean the chunk pool asynchronously") \ 544 \ 545 /* Temporary: See 6948537 */ \ 546 experimental(bool, UseMemSetInBOT, true, \ 547 "(Unstable) uses memset in BOT updates in GC code") \ 548 \ 549 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 550 "Enable normal processing of flags relating to field diagnostics")\ 551 \ 552 experimental(bool, UnlockExperimentalVMOptions, false, \ 553 "Enable normal processing of flags relating to experimental " \ 554 "features") \ 555 \ 556 product(bool, JavaMonitorsInStackTrace, true, \ 557 "Print information about Java monitor locks when the stacks are" \ 558 "dumped") \ 559 \ 560 product_pd(bool, UseLargePages, \ 561 "Use large page memory") \ 562 \ 563 product_pd(bool, UseLargePagesIndividualAllocation, \ 564 "Allocate large pages individually for better affinity") \ 565 \ 566 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 567 "Fail large pages individual allocation") \ 568 \ 569 product(bool, UseLargePagesInMetaspace, false, \ 570 "Use large page memory in metaspace. " \ 571 "Only used if UseLargePages is enabled.") \ 572 \ 573 develop(bool, TracePageSizes, false, \ 574 "Trace page size selection and usage") \ 575 \ 576 product(bool, UseNUMA, false, \ 577 "Use NUMA if available") \ 578 \ 579 product(bool, UseNUMAInterleaving, false, \ 580 "Interleave memory across NUMA nodes if available") \ 581 \ 582 product(uintx, NUMAInterleaveGranularity, 2*M, \ 583 "Granularity to use for NUMA interleaving on Windows OS") \ 584 \ 585 product(bool, ForceNUMA, false, \ 586 "Force NUMA optimizations on single-node/UMA systems") \ 587 \ 588 product(uintx, NUMAChunkResizeWeight, 20, \ 589 "Percentage (0-100) used to weigh the current sample when " \ 590 "computing exponentially decaying average for " \ 591 "AdaptiveNUMAChunkSizing") \ 592 \ 593 product(uintx, NUMASpaceResizeRate, 1*G, \ 594 "Do not reallocate more than this amount per collection") \ 595 \ 596 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 597 "Enable adaptive chunk sizing for NUMA") \ 598 \ 599 product(bool, NUMAStats, false, \ 600 "Print NUMA stats in detailed heap information") \ 601 \ 602 product(uintx, NUMAPageScanRate, 256, \ 603 "Maximum number of pages to include in the page scan procedure") \ 604 \ 605 product_pd(bool, NeedsDeoptSuspend, \ 606 "True for register window machines (sparc/ia64)") \ 607 \ 608 product(intx, UseSSE, 99, \ 609 "Highest supported SSE instructions set on x86/x64") \ 610 \ 611 product(bool, UseAES, false, \ 612 "Control whether AES instructions can be used on x86/x64") \ 613 \ 614 product(bool, UseSHA, false, \ 615 "Control whether SHA instructions can be used on SPARC") \ 616 \ 617 product(uintx, LargePageSizeInBytes, 0, \ 618 "Large page size (0 to let VM choose the page size)") \ 619 \ 620 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 621 "Use large pages if maximum heap is at least this big") \ 622 \ 623 product(bool, ForceTimeHighResolution, false, \ 624 "Using high time resolution (for Win32 only)") \ 625 \ 626 develop(bool, TraceItables, false, \ 627 "Trace initialization and use of itables") \ 628 \ 629 develop(bool, TracePcPatching, false, \ 630 "Trace usage of frame::patch_pc") \ 631 \ 632 develop(bool, TraceJumps, false, \ 633 "Trace assembly jumps in thread ring buffer") \ 634 \ 635 develop(bool, TraceRelocator, false, \ 636 "Trace the bytecode relocator") \ 637 \ 638 develop(bool, TraceLongCompiles, false, \ 639 "Print out every time compilation is longer than " \ 640 "a given threshold") \ 641 \ 642 develop(bool, SafepointALot, false, \ 643 "Generate a lot of safepoints. This works with " \ 644 "GuaranteedSafepointInterval") \ 645 \ 646 product_pd(bool, BackgroundCompilation, \ 647 "A thread requesting compilation is not blocked during " \ 648 "compilation") \ 649 \ 650 product(bool, PrintVMQWaitTime, false, \ 651 "Print out the waiting time in VM operation queue") \ 652 \ 653 develop(bool, NoYieldsInMicrolock, false, \ 654 "Disable yields in microlock") \ 655 \ 656 develop(bool, TraceOopMapGeneration, false, \ 657 "Show OopMapGeneration") \ 658 \ 659 product(bool, MethodFlushing, true, \ 660 "Reclamation of zombie and not-entrant methods") \ 661 \ 662 develop(bool, VerifyStack, false, \ 663 "Verify stack of each thread when it is entering a runtime call") \ 664 \ 665 diagnostic(bool, ForceUnreachable, false, \ 666 "Make all non code cache addresses to be unreachable by " \ 667 "forcing use of 64bit literal fixups") \ 668 \ 669 notproduct(bool, StressDerivedPointers, false, \ 670 "Force scavenge when a derived pointer is detected on stack " \ 671 "after rtm call") \ 672 \ 673 develop(bool, TraceDerivedPointers, false, \ 674 "Trace traversal of derived pointers on stack") \ 675 \ 676 notproduct(bool, TraceCodeBlobStacks, false, \ 677 "Trace stack-walk of codeblobs") \ 678 \ 679 product(bool, PrintJNIResolving, false, \ 680 "Used to implement -v:jni") \ 681 \ 682 notproduct(bool, PrintRewrites, false, \ 683 "Print methods that are being rewritten") \ 684 \ 685 product(bool, UseInlineCaches, true, \ 686 "Use Inline Caches for virtual calls ") \ 687 \ 688 develop(bool, InlineArrayCopy, true, \ 689 "Inline arraycopy native that is known to be part of " \ 690 "base library DLL") \ 691 \ 692 develop(bool, InlineObjectHash, true, \ 693 "Inline Object::hashCode() native that is known to be part " \ 694 "of base library DLL") \ 695 \ 696 develop(bool, InlineNatives, true, \ 697 "Inline natives that are known to be part of base library DLL") \ 698 \ 699 develop(bool, InlineMathNatives, true, \ 700 "Inline SinD, CosD, etc.") \ 701 \ 702 develop(bool, InlineClassNatives, true, \ 703 "Inline Class.isInstance, etc") \ 704 \ 705 develop(bool, InlineThreadNatives, true, \ 706 "Inline Thread.currentThread, etc") \ 707 \ 708 develop(bool, InlineUnsafeOps, true, \ 709 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 710 \ 711 product(bool, CriticalJNINatives, true, \ 712 "Check for critical JNI entry points") \ 713 \ 714 notproduct(bool, StressCriticalJNINatives, false, \ 715 "Exercise register saving code in critical natives") \ 716 \ 717 product(bool, UseSSE42Intrinsics, false, \ 718 "SSE4.2 versions of intrinsics") \ 719 \ 720 product(bool, UseAESIntrinsics, false, \ 721 "Use intrinsics for AES versions of crypto") \ 722 \ 723 product(bool, UseSHA1Intrinsics, false, \ 724 "Use intrinsics for SHA-1 crypto hash function") \ 725 \ 726 product(bool, UseSHA256Intrinsics, false, \ 727 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 728 \ 729 product(bool, UseSHA512Intrinsics, false, \ 730 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 731 \ 732 product(bool, UseCRC32Intrinsics, false, \ 733 "use intrinsics for java.util.zip.CRC32") \ 734 \ 735 develop(bool, TraceCallFixup, false, \ 736 "Trace all call fixups") \ 737 \ 738 develop(bool, DeoptimizeALot, false, \ 739 "Deoptimize at every exit from the runtime system") \ 740 \ 741 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 742 "A comma separated list of bcis to deoptimize at") \ 743 \ 744 product(bool, DeoptimizeRandom, false, \ 745 "Deoptimize random frames on random exit from the runtime system")\ 746 \ 747 notproduct(bool, ZombieALot, false, \ 748 "Create zombies (non-entrant) at exit from the runtime system") \ 749 \ 750 product(bool, UnlinkSymbolsALot, false, \ 751 "Unlink unreferenced symbols from the symbol table at safepoints")\ 752 \ 753 notproduct(bool, WalkStackALot, false, \ 754 "Trace stack (no print) at every exit from the runtime system") \ 755 \ 756 product(bool, Debugging, false, \ 757 "Set when executing debug methods in debug.cpp " \ 758 "(to prevent triggering assertions)") \ 759 \ 760 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 761 "Enable strict checks that safepoints cannot happen for threads " \ 762 "that use No_Safepoint_Verifier") \ 763 \ 764 notproduct(bool, VerifyLastFrame, false, \ 765 "Verify oops on last frame on entry to VM") \ 766 \ 767 develop(bool, TraceHandleAllocation, false, \ 768 "Print out warnings when suspiciously many handles are allocated")\ 769 \ 770 product(bool, UseCompilerSafepoints, true, \ 771 "Stop at safepoints in compiled code") \ 772 \ 773 product(bool, FailOverToOldVerifier, true, \ 774 "Fail over to old verifier when split verifier fails") \ 775 \ 776 develop(bool, ShowSafepointMsgs, false, \ 777 "Show message about safepoint synchronization") \ 778 \ 779 product(bool, SafepointTimeout, false, \ 780 "Time out and warn or fail after SafepointTimeoutDelay " \ 781 "milliseconds if failed to reach safepoint") \ 782 \ 783 develop(bool, DieOnSafepointTimeout, false, \ 784 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 785 \ 786 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 787 /* typically, at most a few retries are needed */ \ 788 product(intx, SuspendRetryCount, 50, \ 789 "Maximum retry count for an external suspend request") \ 790 \ 791 product(intx, SuspendRetryDelay, 5, \ 792 "Milliseconds to delay per retry (* current_retry_count)") \ 793 \ 794 product(bool, AssertOnSuspendWaitFailure, false, \ 795 "Assert/Guarantee on external suspend wait failure") \ 796 \ 797 product(bool, TraceSuspendWaitFailures, false, \ 798 "Trace external suspend wait failures") \ 799 \ 800 product(bool, MaxFDLimit, true, \ 801 "Bump the number of file descriptors to maximum in Solaris") \ 802 \ 803 diagnostic(bool, LogEvents, true, \ 804 "Enable the various ring buffer event logs") \ 805 \ 806 diagnostic(uintx, LogEventsBufferEntries, 10, \ 807 "Number of ring buffer event logs") \ 808 \ 809 product(bool, BytecodeVerificationRemote, true, \ 810 "Enable the Java bytecode verifier for remote classes") \ 811 \ 812 product(bool, BytecodeVerificationLocal, false, \ 813 "Enable the Java bytecode verifier for local classes") \ 814 \ 815 develop(bool, ForceFloatExceptions, trueInDebug, \ 816 "Force exceptions on FP stack under/overflow") \ 817 \ 818 develop(bool, VerifyStackAtCalls, false, \ 819 "Verify that the stack pointer is unchanged after calls") \ 820 \ 821 develop(bool, TraceJavaAssertions, false, \ 822 "Trace java language assertions") \ 823 \ 824 notproduct(bool, CheckAssertionStatusDirectives, false, \ 825 "Temporary - see javaClasses.cpp") \ 826 \ 827 notproduct(bool, PrintMallocFree, false, \ 828 "Trace calls to C heap malloc/free allocation") \ 829 \ 830 product(bool, PrintOopAddress, false, \ 831 "Always print the location of the oop") \ 832 \ 833 notproduct(bool, VerifyCodeCacheOften, false, \ 834 "Verify compiled-code cache often") \ 835 \ 836 develop(bool, ZapDeadCompiledLocals, false, \ 837 "Zap dead locals in compiler frames") \ 838 \ 839 notproduct(bool, ZapDeadLocalsOld, false, \ 840 "Zap dead locals (old version, zaps all frames when " \ 841 "entering the VM") \ 842 \ 843 notproduct(bool, CheckOopishValues, false, \ 844 "Warn if value contains oop (requires ZapDeadLocals)") \ 845 \ 846 develop(bool, UseMallocOnly, false, \ 847 "Use only malloc/free for allocation (no resource area/arena)") \ 848 \ 849 develop(bool, PrintMalloc, false, \ 850 "Print all malloc/free calls") \ 851 \ 852 develop(bool, PrintMallocStatistics, false, \ 853 "Print malloc/free statistics") \ 854 \ 855 develop(bool, ZapResourceArea, trueInDebug, \ 856 "Zap freed resource/arena space with 0xABABABAB") \ 857 \ 858 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 859 "Zap freed VM handle space with 0xBCBCBCBC") \ 860 \ 861 develop(bool, ZapJNIHandleArea, trueInDebug, \ 862 "Zap freed JNI handle space with 0xFEFEFEFE") \ 863 \ 864 notproduct(bool, ZapStackSegments, trueInDebug, \ 865 "Zap allocated/freed stack segments with 0xFADFADED") \ 866 \ 867 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 868 "Zap unused heap space with 0xBAADBABE") \ 869 \ 870 develop(bool, TraceZapUnusedHeapArea, false, \ 871 "Trace zapping of unused heap space") \ 872 \ 873 develop(bool, CheckZapUnusedHeapArea, false, \ 874 "Check zapping of unused heap space") \ 875 \ 876 develop(bool, ZapFillerObjects, trueInDebug, \ 877 "Zap filler objects with 0xDEAFBABE") \ 878 \ 879 develop(bool, PrintVMMessages, true, \ 880 "Print VM messages on console") \ 881 \ 882 product(bool, PrintGCApplicationConcurrentTime, false, \ 883 "Print the time the application has been running") \ 884 \ 885 product(bool, PrintGCApplicationStoppedTime, false, \ 886 "Print the time the application has been stopped") \ 887 \ 888 diagnostic(bool, VerboseVerification, false, \ 889 "Display detailed verification details") \ 890 \ 891 notproduct(uintx, ErrorHandlerTest, 0, \ 892 "If > 0, provokes an error after VM initialization; the value " \ 893 "determines which error to provoke. See test_error_handler() " \ 894 "in debug.cpp.") \ 895 \ 896 develop(bool, Verbose, false, \ 897 "Print additional debugging information from other modes") \ 898 \ 899 develop(bool, PrintMiscellaneous, false, \ 900 "Print uncategorized debugging information (requires +Verbose)") \ 901 \ 902 develop(bool, WizardMode, false, \ 903 "Print much more debugging information") \ 904 \ 905 product(bool, ShowMessageBoxOnError, false, \ 906 "Keep process alive on VM fatal error") \ 907 \ 908 product(bool, CreateMinidumpOnCrash, false, \ 909 "Create minidump on VM fatal error") \ 910 \ 911 product_pd(bool, UseOSErrorReporting, \ 912 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 913 \ 914 product(bool, SuppressFatalErrorMessage, false, \ 915 "Report NO fatal error message (avoid deadlock)") \ 916 \ 917 product(ccstrlist, OnError, "", \ 918 "Run user-defined commands on fatal error; see VMError.cpp " \ 919 "for examples") \ 920 \ 921 product(ccstrlist, OnOutOfMemoryError, "", \ 922 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 923 \ 924 manageable(bool, HeapDumpBeforeFullGC, false, \ 925 "Dump heap to file before any major stop-the-world GC") \ 926 \ 927 manageable(bool, HeapDumpAfterFullGC, false, \ 928 "Dump heap to file after any major stop-the-world GC") \ 929 \ 930 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 931 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 932 \ 933 manageable(ccstr, HeapDumpPath, NULL, \ 934 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 935 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 936 "in the working directory)") \ 937 \ 938 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 939 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 940 "when the heap usage is larger than this") \ 941 \ 942 develop(uintx, HeapDumpSegmentSize, 1*G, \ 943 "Approximate segment size when generating a segmented heap dump") \ 944 \ 945 develop(bool, BreakAtWarning, false, \ 946 "Execute breakpoint upon encountering VM warning") \ 947 \ 948 develop(bool, TraceVMOperation, false, \ 949 "Trace VM operations") \ 950 \ 951 develop(bool, UseFakeTimers, false, \ 952 "Tell whether the VM should use system time or a fake timer") \ 953 \ 954 product(ccstr, NativeMemoryTracking, "off", \ 955 "Native memory tracking options") \ 956 \ 957 diagnostic(bool, PrintNMTStatistics, false, \ 958 "Print native memory tracking summary data if it is on") \ 959 \ 960 diagnostic(bool, LogCompilation, false, \ 961 "Log compilation activity in detail to LogFile") \ 962 \ 963 product(bool, PrintCompilation, false, \ 964 "Print compilations") \ 965 \ 966 diagnostic(bool, TraceNMethodInstalls, false, \ 967 "Trace nmethod installation") \ 968 \ 969 diagnostic(intx, ScavengeRootsInCode, 2, \ 970 "0: do not allow scavengable oops in the code cache; " \ 971 "1: allow scavenging from the code cache; " \ 972 "2: emit as many constants as the compiler can see") \ 973 \ 974 product(bool, AlwaysRestoreFPU, false, \ 975 "Restore the FPU control word after every JNI call (expensive)") \ 976 \ 977 diagnostic(bool, PrintCompilation2, false, \ 978 "Print additional statistics per compilation") \ 979 \ 980 diagnostic(bool, PrintAdapterHandlers, false, \ 981 "Print code generated for i2c/c2i adapters") \ 982 \ 983 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 984 "Verify that i2c/c2i adapters are called properly") \ 985 \ 986 develop(bool, VerifyAdapterSharing, false, \ 987 "Verify that the code for shared adapters is the equivalent") \ 988 \ 989 diagnostic(bool, PrintAssembly, false, \ 990 "Print assembly code (using external disassembler.so)") \ 991 \ 992 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 993 "Print options string passed to disassembler.so") \ 994 \ 995 diagnostic(bool, PrintNMethods, false, \ 996 "Print assembly code for nmethods when generated") \ 997 \ 998 diagnostic(bool, PrintNativeNMethods, false, \ 999 "Print assembly code for native nmethods when generated") \ 1000 \ 1001 develop(bool, PrintDebugInfo, false, \ 1002 "Print debug information for all nmethods when generated") \ 1003 \ 1004 develop(bool, PrintRelocations, false, \ 1005 "Print relocation information for all nmethods when generated") \ 1006 \ 1007 develop(bool, PrintDependencies, false, \ 1008 "Print dependency information for all nmethods when generated") \ 1009 \ 1010 develop(bool, PrintExceptionHandlers, false, \ 1011 "Print exception handler tables for all nmethods when generated") \ 1012 \ 1013 develop(bool, StressCompiledExceptionHandlers, false, \ 1014 "Exercise compiled exception handlers") \ 1015 \ 1016 develop(bool, InterceptOSException, false, \ 1017 "Start debugger when an implicit OS (e.g. NULL) " \ 1018 "exception happens") \ 1019 \ 1020 product(bool, PrintCodeCache, false, \ 1021 "Print the code cache memory usage when exiting") \ 1022 \ 1023 develop(bool, PrintCodeCache2, false, \ 1024 "Print detailed usage information on the code cache when exiting")\ 1025 \ 1026 product(bool, PrintCodeCacheOnCompilation, false, \ 1027 "Print the code cache memory usage each time a method is " \ 1028 "compiled") \ 1029 \ 1030 diagnostic(bool, PrintStubCode, false, \ 1031 "Print generated stub code") \ 1032 \ 1033 product(bool, StackTraceInThrowable, true, \ 1034 "Collect backtrace in throwable when exception happens") \ 1035 \ 1036 product(bool, OmitStackTraceInFastThrow, true, \ 1037 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1038 \ 1039 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1040 "Print bytecode statistics when dumping profiler output") \ 1041 \ 1042 product(bool, ProfilerRecordPC, false, \ 1043 "Collect ticks for each 16 byte interval of compiled code") \ 1044 \ 1045 product(bool, ProfileVM, false, \ 1046 "Profile ticks that fall within VM (either in the VM Thread " \ 1047 "or VM code called through stubs)") \ 1048 \ 1049 product(bool, ProfileIntervals, false, \ 1050 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1051 \ 1052 notproduct(bool, ProfilerCheckIntervals, false, \ 1053 "Collect and print information on spacing of profiler ticks") \ 1054 \ 1055 develop(bool, PrintJVMWarnings, false, \ 1056 "Print warnings for unimplemented JVM functions") \ 1057 \ 1058 product(bool, PrintWarnings, true, \ 1059 "Print JVM warnings to output stream") \ 1060 \ 1061 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1062 "Print warnings for stalled SpinLocks") \ 1063 \ 1064 product(bool, RegisterFinalizersAtInit, true, \ 1065 "Register finalizable objects at end of Object.<init> or " \ 1066 "after allocation") \ 1067 \ 1068 develop(bool, RegisterReferences, true, \ 1069 "Tell whether the VM should register soft/weak/final/phantom " \ 1070 "references") \ 1071 \ 1072 develop(bool, IgnoreRewrites, false, \ 1073 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1074 "This is unsafe!") \ 1075 \ 1076 develop(bool, PrintCodeCacheExtension, false, \ 1077 "Print extension of code cache") \ 1078 \ 1079 develop(bool, UsePrivilegedStack, true, \ 1080 "Enable the security JVM functions") \ 1081 \ 1082 develop(bool, ProtectionDomainVerification, true, \ 1083 "Verify protection domain before resolution in system dictionary")\ 1084 \ 1085 product(bool, ClassUnloading, true, \ 1086 "Do unloading of classes") \ 1087 \ 1088 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1089 "Do unloading of classes with a concurrent marking cycle") \ 1090 \ 1091 develop(bool, DisableStartThread, false, \ 1092 "Disable starting of additional Java threads " \ 1093 "(for debugging only)") \ 1094 \ 1095 develop(bool, MemProfiling, false, \ 1096 "Write memory usage profiling to log file") \ 1097 \ 1098 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1099 "Print the system dictionary at exit") \ 1100 \ 1101 experimental(intx, PredictedLoadedClassCount, 0, \ 1102 "Experimental: Tune loaded class cache starting size") \ 1103 \ 1104 diagnostic(bool, UnsyncloadClass, false, \ 1105 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1106 "class loader must call VM synchronized for findClass " \ 1107 "and defineClass.") \ 1108 \ 1109 product(bool, AlwaysLockClassLoader, false, \ 1110 "Require the VM to acquire the class loader lock before calling " \ 1111 "loadClass() even for class loaders registering " \ 1112 "as parallel capable") \ 1113 \ 1114 product(bool, AllowParallelDefineClass, false, \ 1115 "Allow parallel defineClass requests for class loaders " \ 1116 "registering as parallel capable") \ 1117 \ 1118 product(bool, MustCallLoadClassInternal, false, \ 1119 "Call loadClassInternal() rather than loadClass()") \ 1120 \ 1121 product_pd(bool, DontYieldALot, \ 1122 "Throw away obvious excess yield calls (for Solaris only)") \ 1123 \ 1124 product_pd(bool, ConvertSleepToYield, \ 1125 "Convert sleep(0) to thread yield " \ 1126 "(may be off for Solaris to improve GUI)") \ 1127 \ 1128 product(bool, ConvertYieldToSleep, false, \ 1129 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1130 "behavior (Solaris only)") \ 1131 \ 1132 product(bool, UseBoundThreads, true, \ 1133 "Bind user level threads to kernel threads (for Solaris only)") \ 1134 \ 1135 develop(bool, UseDetachedThreads, true, \ 1136 "Use detached threads that are recycled upon termination " \ 1137 "(for Solaris only)") \ 1138 \ 1139 product(bool, UseLWPSynchronization, true, \ 1140 "Use LWP-based instead of libthread-based synchronization " \ 1141 "(SPARC only)") \ 1142 \ 1143 product(ccstr, SyncKnobs, NULL, \ 1144 "(Unstable) Various monitor synchronization tunables") \ 1145 \ 1146 product(intx, EmitSync, 0, \ 1147 "(Unsafe, Unstable) " \ 1148 "Control emission of inline sync fast-path code") \ 1149 \ 1150 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1151 \ 1152 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1153 \ 1154 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \ 1155 \ 1156 product(intx, SyncVerbose, 0, "(Unstable)") \ 1157 \ 1158 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1159 \ 1160 product(intx, hashCode, 5, \ 1161 "(Unstable) select hashCode generation algorithm") \ 1162 \ 1163 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1164 "(Unstable, Linux-specific) " \ 1165 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1166 \ 1167 product(bool, FilterSpuriousWakeups, true, \ 1168 "Prevent spurious or premature wakeups from object.wait " \ 1169 "(Solaris only)") \ 1170 \ 1171 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1172 \ 1173 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1174 \ 1175 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1176 \ 1177 develop(bool, UsePthreads, false, \ 1178 "Use pthread-based instead of libthread-based synchronization " \ 1179 "(SPARC only)") \ 1180 \ 1181 product(bool, AdjustConcurrency, false, \ 1182 "Call thr_setconcurrency at thread creation time to avoid " \ 1183 "LWP starvation on MP systems (for Solaris Only)") \ 1184 \ 1185 product(bool, ReduceSignalUsage, false, \ 1186 "Reduce the use of OS signals in Java and/or the VM") \ 1187 \ 1188 develop_pd(bool, ShareVtableStubs, \ 1189 "Share vtable stubs (smaller code but worse branch prediction") \ 1190 \ 1191 develop(bool, LoadLineNumberTables, true, \ 1192 "Tell whether the class file parser loads line number tables") \ 1193 \ 1194 develop(bool, LoadLocalVariableTables, true, \ 1195 "Tell whether the class file parser loads local variable tables") \ 1196 \ 1197 develop(bool, LoadLocalVariableTypeTables, true, \ 1198 "Tell whether the class file parser loads local variable type" \ 1199 "tables") \ 1200 \ 1201 product(bool, AllowUserSignalHandlers, false, \ 1202 "Do not complain if the application installs signal handlers " \ 1203 "(Solaris & Linux only)") \ 1204 \ 1205 product(bool, UseSignalChaining, true, \ 1206 "Use signal-chaining to invoke signal handlers installed " \ 1207 "by the application (Solaris & Linux only)") \ 1208 \ 1209 product(bool, UseAltSigs, false, \ 1210 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1211 "internal signals (Solaris only)") \ 1212 \ 1213 product(bool, AllowJNIEnvProxy, false, \ 1214 "Allow JNIEnv proxies for jdbx") \ 1215 \ 1216 product(bool, JNIDetachReleasesMonitors, true, \ 1217 "JNI DetachCurrentThread releases monitors owned by thread") \ 1218 \ 1219 product(bool, RestoreMXCSROnJNICalls, false, \ 1220 "Restore MXCSR when returning from JNI calls") \ 1221 \ 1222 product(bool, CheckJNICalls, false, \ 1223 "Verify all arguments to JNI calls") \ 1224 \ 1225 product(bool, CheckEndorsedAndExtDirs, false, \ 1226 "Verify the endorsed and extension directories are not used") \ 1227 \ 1228 product(bool, UseFastJNIAccessors, true, \ 1229 "Use optimized versions of Get<Primitive>Field") \ 1230 \ 1231 product(intx, MaxJNILocalCapacity, 65536, \ 1232 "Maximum allowable local JNI handle capacity to " \ 1233 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1234 "where <= 0 is unlimited, default: 65536") \ 1235 \ 1236 product(bool, EagerXrunInit, false, \ 1237 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1238 "but not all -Xrun libraries may support the state of the VM " \ 1239 "at this time") \ 1240 \ 1241 product(bool, PreserveAllAnnotations, false, \ 1242 "Preserve RuntimeInvisibleAnnotations as well " \ 1243 "as RuntimeVisibleAnnotations") \ 1244 \ 1245 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1246 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1247 \ 1248 product(bool, LazyBootClassLoader, true, \ 1249 "Enable/disable lazy opening of boot class path entries") \ 1250 \ 1251 product(bool, UseXMMForArrayCopy, false, \ 1252 "Use SSE2 MOVQ instruction for Arraycopy") \ 1253 \ 1254 product(intx, FieldsAllocationStyle, 1, \ 1255 "0 - type based with oops first, 1 - with oops last, " \ 1256 "2 - oops in super and sub classes are together") \ 1257 \ 1258 product(bool, CompactFields, true, \ 1259 "Allocate nonstatic fields in gaps between previous fields") \ 1260 \ 1261 notproduct(bool, PrintFieldLayout, false, \ 1262 "Print field layout for each class") \ 1263 \ 1264 product(intx, ContendedPaddingWidth, 128, \ 1265 "How many bytes to pad the fields/classes marked @Contended with")\ 1266 \ 1267 product(bool, EnableContended, true, \ 1268 "Enable @Contended annotation support") \ 1269 \ 1270 product(bool, RestrictContended, true, \ 1271 "Restrict @Contended to trusted classes") \ 1272 \ 1273 product(bool, UseBiasedLocking, true, \ 1274 "Enable biased locking in JVM") \ 1275 \ 1276 product(intx, BiasedLockingStartupDelay, 4000, \ 1277 "Number of milliseconds to wait before enabling biased locking") \ 1278 \ 1279 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1280 "Print statistics of biased locking in JVM") \ 1281 \ 1282 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1283 "Threshold of number of revocations per type to try to " \ 1284 "rebias all objects in the heap of that type") \ 1285 \ 1286 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1287 "Threshold of number of revocations per type to permanently " \ 1288 "revoke biases of all objects in the heap of that type") \ 1289 \ 1290 product(intx, BiasedLockingDecayTime, 25000, \ 1291 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1292 "type after previous bulk rebias") \ 1293 \ 1294 product(bool, ExitOnOutOfMemoryError, false, \ 1295 "JVM exits on the first occurrence of an out-of-memory error") \ 1296 \ 1297 product(bool, CrashOnOutOfMemoryError, false, \ 1298 "JVM aborts, producing an error log and core/mini dump, on the " \ 1299 "first occurrence of an out-of-memory error") \ 1300 \ 1301 /* tracing */ \ 1302 \ 1303 notproduct(bool, TraceRuntimeCalls, false, \ 1304 "Trace run-time calls") \ 1305 \ 1306 develop(bool, TraceJNICalls, false, \ 1307 "Trace JNI calls") \ 1308 \ 1309 develop(bool, StressRewriter, false, \ 1310 "Stress linktime bytecode rewriting") \ 1311 \ 1312 notproduct(bool, TraceJVMCalls, false, \ 1313 "Trace JVM calls") \ 1314 \ 1315 product(ccstr, TraceJVMTI, NULL, \ 1316 "Trace flags for JVMTI functions and events") \ 1317 \ 1318 /* This option can change an EMCP method into an obsolete method. */ \ 1319 /* This can affect tests that except specific methods to be EMCP. */ \ 1320 /* This option should be used with caution. */ \ 1321 product(bool, StressLdcRewrite, false, \ 1322 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1323 \ 1324 product(intx, TraceRedefineClasses, 0, \ 1325 "Trace level for JVMTI RedefineClasses") \ 1326 \ 1327 develop(bool, StressMethodComparator, false, \ 1328 "Run the MethodComparator on all loaded methods") \ 1329 \ 1330 /* change to false by default sometime after Mustang */ \ 1331 product(bool, VerifyMergedCPBytecodes, true, \ 1332 "Verify bytecodes after RedefineClasses constant pool merging") \ 1333 \ 1334 develop(bool, TraceJNIHandleAllocation, false, \ 1335 "Trace allocation/deallocation of JNI handle blocks") \ 1336 \ 1337 develop(bool, TraceThreadEvents, false, \ 1338 "Trace all thread events") \ 1339 \ 1340 develop(bool, TraceBytecodes, false, \ 1341 "Trace bytecode execution") \ 1342 \ 1343 develop(bool, TraceClassInitialization, false, \ 1344 "Trace class initialization") \ 1345 \ 1346 develop(bool, TraceExceptions, false, \ 1347 "Trace exceptions") \ 1348 \ 1349 develop(bool, TraceICs, false, \ 1350 "Trace inline cache changes") \ 1351 \ 1352 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1353 "Trace method invocation counter overflow") \ 1354 \ 1355 develop(bool, TraceInlineCacheClearing, false, \ 1356 "Trace clearing of inline caches in nmethods") \ 1357 \ 1358 develop(bool, TraceDependencies, false, \ 1359 "Trace dependencies") \ 1360 \ 1361 develop(bool, VerifyDependencies, trueInDebug, \ 1362 "Exercise and verify the compilation dependency mechanism") \ 1363 \ 1364 develop(bool, TraceNewOopMapGeneration, false, \ 1365 "Trace OopMapGeneration") \ 1366 \ 1367 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1368 "Trace OopMapGeneration: print detailed cell states") \ 1369 \ 1370 develop(bool, TimeOopMap, false, \ 1371 "Time calls to GenerateOopMap::compute_map() in sum") \ 1372 \ 1373 develop(bool, TimeOopMap2, false, \ 1374 "Time calls to GenerateOopMap::compute_map() individually") \ 1375 \ 1376 develop(bool, TraceMonitorMismatch, false, \ 1377 "Trace monitor matching failures during OopMapGeneration") \ 1378 \ 1379 develop(bool, TraceOopMapRewrites, false, \ 1380 "Trace rewriting of method oops during oop map generation") \ 1381 \ 1382 develop(bool, TraceSafepoint, false, \ 1383 "Trace safepoint operations") \ 1384 \ 1385 develop(bool, TraceICBuffer, false, \ 1386 "Trace usage of IC buffer") \ 1387 \ 1388 develop(bool, TraceCompiledIC, false, \ 1389 "Trace changes of compiled IC") \ 1390 \ 1391 notproduct(bool, TraceZapDeadLocals, false, \ 1392 "Trace zapping dead locals") \ 1393 \ 1394 develop(bool, TraceStartupTime, false, \ 1395 "Trace setup time") \ 1396 \ 1397 develop(bool, TraceProtectionDomainVerification, false, \ 1398 "Trace protection domain verification") \ 1399 \ 1400 develop(bool, TraceClearedExceptions, false, \ 1401 "Print when an exception is forcibly cleared") \ 1402 \ 1403 product(bool, TraceClassResolution, false, \ 1404 "Trace all constant pool resolutions (for debugging)") \ 1405 \ 1406 product(bool, TraceBiasedLocking, false, \ 1407 "Trace biased locking in JVM") \ 1408 \ 1409 product(bool, TraceMonitorInflation, false, \ 1410 "Trace monitor inflation in JVM") \ 1411 \ 1412 /* gc */ \ 1413 \ 1414 product(bool, UseSerialGC, false, \ 1415 "Use the Serial garbage collector") \ 1416 \ 1417 product(bool, UseG1GC, false, \ 1418 "Use the Garbage-First garbage collector") \ 1419 \ 1420 product(bool, UseParallelGC, false, \ 1421 "Use the Parallel Scavenge garbage collector") \ 1422 \ 1423 product(bool, UseParallelOldGC, false, \ 1424 "Use the Parallel Old garbage collector") \ 1425 \ 1426 product(uintx, HeapMaximumCompactionInterval, 20, \ 1427 "How often should we maximally compact the heap (not allowing " \ 1428 "any dead space)") \ 1429 \ 1430 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1431 "The collection count for the first maximum compaction") \ 1432 \ 1433 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1434 "Use maximum compaction in the Parallel Old garbage collector " \ 1435 "for a system GC") \ 1436 \ 1437 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1438 "The mean used by the parallel compact dead wood " \ 1439 "limiter (a number between 0-100)") \ 1440 \ 1441 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1442 "The standard deviation used by the parallel compact dead wood " \ 1443 "limiter (a number between 0-100)") \ 1444 \ 1445 product(uintx, ParallelGCThreads, 0, \ 1446 "Number of parallel threads parallel gc will use") \ 1447 \ 1448 product(bool, UseDynamicNumberOfGCThreads, false, \ 1449 "Dynamically choose the number of parallel threads " \ 1450 "parallel gc will use") \ 1451 \ 1452 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1453 "Force dynamic selection of the number of " \ 1454 "parallel threads parallel gc will use to aid debugging") \ 1455 \ 1456 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1457 "Size of heap (bytes) per GC thread used in calculating the " \ 1458 "number of GC threads") \ 1459 \ 1460 product(bool, TraceDynamicGCThreads, false, \ 1461 "Trace the dynamic GC thread usage") \ 1462 \ 1463 develop(bool, ParallelOldGCSplitALot, false, \ 1464 "Provoke splitting (copying data from a young gen space to " \ 1465 "multiple destination spaces)") \ 1466 \ 1467 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1468 "How often to provoke splitting a young gen space") \ 1469 \ 1470 product(uintx, ConcGCThreads, 0, \ 1471 "Number of threads concurrent gc will use") \ 1472 \ 1473 product(uintx, YoungPLABSize, 4096, \ 1474 "Size of young gen promotion LAB's (in HeapWords)") \ 1475 \ 1476 product(uintx, OldPLABSize, 1024, \ 1477 "Size of old gen promotion LAB's (in HeapWords)") \ 1478 \ 1479 product(uintx, GCTaskTimeStampEntries, 200, \ 1480 "Number of time stamp entries per gc worker thread") \ 1481 \ 1482 product(bool, AlwaysTenure, false, \ 1483 "Always tenure objects in eden (ParallelGC only)") \ 1484 \ 1485 product(bool, NeverTenure, false, \ 1486 "Never tenure objects in eden, may tenure on overflow " \ 1487 "(ParallelGC only)") \ 1488 \ 1489 product(bool, ScavengeBeforeFullGC, true, \ 1490 "Scavenge youngest generation before each full GC, " \ 1491 "used with UseParallelGC") \ 1492 \ 1493 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1494 "Allow scavenges to occur when to-space contains objects") \ 1495 \ 1496 product(bool, UseConcMarkSweepGC, false, \ 1497 "Use Concurrent Mark-Sweep GC in the old generation") \ 1498 \ 1499 product(bool, ExplicitGCInvokesConcurrent, false, \ 1500 "A System.gc() request invokes a concurrent collection; " \ 1501 "(effective only when UseConcMarkSweepGC)") \ 1502 \ 1503 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1504 "A System.gc() request invokes a concurrent collection and " \ 1505 "also unloads classes during such a concurrent gc cycle " \ 1506 "(effective only when UseConcMarkSweepGC)") \ 1507 \ 1508 product(bool, GCLockerInvokesConcurrent, false, \ 1509 "The exit of a JNI critical section necessitating a scavenge, " \ 1510 "also kicks off a background concurrent collection") \ 1511 \ 1512 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1513 "How much the GC can expand the eden by while the GC locker " \ 1514 "is active (as a percentage)") \ 1515 \ 1516 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1517 "Number of times to retry allocations when " \ 1518 "blocked by the GC locker") \ 1519 \ 1520 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1521 "Use adaptive free lists in the CMS generation") \ 1522 \ 1523 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1524 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1525 \ 1526 develop(bool, RotateCMSCollectionTypes, false, \ 1527 "Rotate the CMS collections among concurrent and STW") \ 1528 \ 1529 product(bool, UseCMSBestFit, true, \ 1530 "Use CMS best fit allocation strategy") \ 1531 \ 1532 product(bool, UseCMSCollectionPassing, true, \ 1533 "Use passing of collection from background to foreground") \ 1534 \ 1535 product(bool, UseParNewGC, false, \ 1536 "Use parallel threads in the new generation") \ 1537 \ 1538 product(bool, ParallelGCVerbose, false, \ 1539 "Verbose output for parallel gc") \ 1540 \ 1541 product(uintx, ParallelGCBufferWastePct, 10, \ 1542 "Wasted fraction of parallel allocation buffer") \ 1543 \ 1544 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1545 "Retain parallel allocation buffers across scavenges; " \ 1546 "it is disabled because this currently conflicts with " \ 1547 "parallel card scanning under certain conditions.") \ 1548 \ 1549 product(uintx, TargetPLABWastePct, 10, \ 1550 "Target wasted space in last buffer as percent of overall " \ 1551 "allocation") \ 1552 \ 1553 product(uintx, PLABWeight, 75, \ 1554 "Percentage (0-100) used to weigh the current sample when " \ 1555 "computing exponentially decaying average for ResizePLAB") \ 1556 \ 1557 product(bool, ResizePLAB, true, \ 1558 "Dynamically resize (survivor space) promotion LAB's") \ 1559 \ 1560 product(bool, PrintPLAB, false, \ 1561 "Print (survivor space) promotion LAB's sizing decisions") \ 1562 \ 1563 product(intx, ParGCArrayScanChunk, 50, \ 1564 "Scan a subset of object array and push remainder, if array is " \ 1565 "bigger than this") \ 1566 \ 1567 product(bool, ParGCUseLocalOverflow, false, \ 1568 "Instead of a global overflow list, use local overflow stacks") \ 1569 \ 1570 product(bool, ParGCTrimOverflow, true, \ 1571 "Eagerly trim the local overflow lists " \ 1572 "(when ParGCUseLocalOverflow)") \ 1573 \ 1574 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1575 "Simulate work queue overflow in ParNew") \ 1576 \ 1577 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1578 "An `interval' counter that determines how frequently " \ 1579 "we simulate overflow; a smaller number increases frequency") \ 1580 \ 1581 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1582 "The desired number of objects to claim from the overflow list") \ 1583 \ 1584 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1585 "The number of strides per worker thread that we divide up the " \ 1586 "card table scanning work into") \ 1587 \ 1588 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1589 "The number of cards in each chunk of the parallel chunks used " \ 1590 "during card table scanning") \ 1591 \ 1592 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1593 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1594 "for parallel GC") \ 1595 \ 1596 product(uintx, OldPLABWeight, 50, \ 1597 "Percentage (0-100) used to weight the current sample when " \ 1598 "computing exponentially decaying average for resizing " \ 1599 "CMSParPromoteBlocksToClaim") \ 1600 \ 1601 product(bool, ResizeOldPLAB, true, \ 1602 "Dynamically resize (old gen) promotion LAB's") \ 1603 \ 1604 product(bool, PrintOldPLAB, false, \ 1605 "Print (old gen) promotion LAB's sizing decisions") \ 1606 \ 1607 product(uintx, CMSOldPLABMin, 16, \ 1608 "Minimum size of CMS gen promotion LAB caches per worker " \ 1609 "per block size") \ 1610 \ 1611 product(uintx, CMSOldPLABMax, 1024, \ 1612 "Maximum size of CMS gen promotion LAB caches per worker " \ 1613 "per block size") \ 1614 \ 1615 product(uintx, CMSOldPLABNumRefills, 4, \ 1616 "Nominal number of refills of CMS gen promotion LAB cache " \ 1617 "per worker per block size") \ 1618 \ 1619 product(bool, CMSOldPLABResizeQuicker, false, \ 1620 "React on-the-fly during a scavenge to a sudden " \ 1621 "change in block demand rate") \ 1622 \ 1623 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1624 "The tolerance of the phase-change detector for on-the-fly " \ 1625 "PLAB resizing during a scavenge") \ 1626 \ 1627 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1628 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1629 "during a scavenge") \ 1630 \ 1631 product(bool, AlwaysPreTouch, false, \ 1632 "Force all freshly committed pages to be pre-touched") \ 1633 \ 1634 product_pd(uintx, CMSYoungGenPerWorker, \ 1635 "The maximum size of young gen chosen by default per GC worker " \ 1636 "thread available") \ 1637 \ 1638 product(bool, CMSIncrementalMode, false, \ 1639 "Whether CMS GC should operate in \"incremental\" mode") \ 1640 \ 1641 product(uintx, CMSIncrementalDutyCycle, 10, \ 1642 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1643 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1644 "value.") \ 1645 \ 1646 product(bool, CMSIncrementalPacing, true, \ 1647 "Whether the CMS incremental mode duty cycle should be " \ 1648 "automatically adjusted") \ 1649 \ 1650 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1651 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1652 "used when CMSIncrementalPacing is enabled") \ 1653 \ 1654 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1655 "Percentage (0-100) used to add conservatism when computing the " \ 1656 "duty cycle") \ 1657 \ 1658 product(uintx, CMSIncrementalOffset, 0, \ 1659 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1660 "is shifted to the right within the period between young GCs") \ 1661 \ 1662 product(uintx, CMSExpAvgFactor, 50, \ 1663 "Percentage (0-100) used to weigh the current sample when " \ 1664 "computing exponential averages for CMS statistics") \ 1665 \ 1666 product(uintx, CMS_FLSWeight, 75, \ 1667 "Percentage (0-100) used to weigh the current sample when " \ 1668 "computing exponentially decaying averages for CMS FLS " \ 1669 "statistics") \ 1670 \ 1671 product(uintx, CMS_FLSPadding, 1, \ 1672 "The multiple of deviation from mean to use for buffering " \ 1673 "against volatility in free list demand") \ 1674 \ 1675 product(uintx, FLSCoalescePolicy, 2, \ 1676 "CMS: aggressiveness level for coalescing, increasing " \ 1677 "from 0 to 4") \ 1678 \ 1679 product(bool, FLSAlwaysCoalesceLarge, false, \ 1680 "CMS: larger free blocks are always available for coalescing") \ 1681 \ 1682 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1683 "CMS: the smaller the percentage the greater the coalescing " \ 1684 "force") \ 1685 \ 1686 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1687 "CMS: the factor by which to inflate estimated demand of small " \ 1688 "block sizes to prevent coalescing with an adjoining block") \ 1689 \ 1690 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1691 "CMS: the factor by which to inflate estimated demand of large " \ 1692 "block sizes to prevent coalescing with an adjoining block") \ 1693 \ 1694 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1695 "CMS: the factor by which to inflate estimated demand of small " \ 1696 "block sizes to prevent splitting to supply demand for smaller " \ 1697 "blocks") \ 1698 \ 1699 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1700 "CMS: the factor by which to inflate estimated demand of large " \ 1701 "block sizes to prevent splitting to supply demand for smaller " \ 1702 "blocks") \ 1703 \ 1704 product(bool, CMSExtrapolateSweep, false, \ 1705 "CMS: cushion for block demand during sweep") \ 1706 \ 1707 product(uintx, CMS_SweepWeight, 75, \ 1708 "Percentage (0-100) used to weight the current sample when " \ 1709 "computing exponentially decaying average for inter-sweep " \ 1710 "duration") \ 1711 \ 1712 product(uintx, CMS_SweepPadding, 1, \ 1713 "The multiple of deviation from mean to use for buffering " \ 1714 "against volatility in inter-sweep duration") \ 1715 \ 1716 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1717 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1718 "duration exceeds this threshold in milliseconds") \ 1719 \ 1720 develop(bool, CMSTraceIncrementalMode, false, \ 1721 "Trace CMS incremental mode") \ 1722 \ 1723 develop(bool, CMSTraceIncrementalPacing, false, \ 1724 "Trace CMS incremental mode pacing computation") \ 1725 \ 1726 develop(bool, CMSTraceThreadState, false, \ 1727 "Trace the CMS thread state (enable the trace_state() method)") \ 1728 \ 1729 product(bool, CMSClassUnloadingEnabled, true, \ 1730 "Whether class unloading enabled when using CMS GC") \ 1731 \ 1732 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1733 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1734 "count for which classes may not be unloaded") \ 1735 \ 1736 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1737 "Compact when asked to collect CMS gen with " \ 1738 "clear_all_soft_refs()") \ 1739 \ 1740 product(bool, UseCMSCompactAtFullCollection, true, \ 1741 "Use Mark-Sweep-Compact algorithm at full collections") \ 1742 \ 1743 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1744 "Number of CMS full collection done before compaction if > 0") \ 1745 \ 1746 develop(intx, CMSDictionaryChoice, 0, \ 1747 "Use BinaryTreeDictionary as default in the CMS generation") \ 1748 \ 1749 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1750 "Replenish an indexed free list with this number of chunks") \ 1751 \ 1752 product(bool, CMSReplenishIntermediate, true, \ 1753 "Replenish all intermediate free-list caches") \ 1754 \ 1755 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1756 "When satisfying batched demand, split blocks from the " \ 1757 "IndexedFreeList whose size is a multiple of requested size") \ 1758 \ 1759 product(bool, CMSLoopWarn, false, \ 1760 "Warn in case of excessive CMS looping") \ 1761 \ 1762 develop(bool, CMSOverflowEarlyRestoration, false, \ 1763 "Restore preserved marks early") \ 1764 \ 1765 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1766 "Size of marking stack") \ 1767 \ 1768 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1769 "Maximum size of marking stack") \ 1770 \ 1771 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1772 "Simulate frequent marking stack / work queue overflow") \ 1773 \ 1774 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1775 "An \"interval\" counter that determines how frequently " \ 1776 "to simulate overflow; a smaller number increases frequency") \ 1777 \ 1778 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1779 "(Temporary, subject to experimentation) " \ 1780 "Maximum number of abortable preclean iterations, if > 0") \ 1781 \ 1782 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1783 "(Temporary, subject to experimentation) " \ 1784 "Maximum time in abortable preclean (in milliseconds)") \ 1785 \ 1786 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1787 "(Temporary, subject to experimentation) " \ 1788 "Nominal minimum work per abortable preclean iteration") \ 1789 \ 1790 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1791 "(Temporary, subject to experimentation) " \ 1792 "Time that we sleep between iterations when not given " \ 1793 "enough work per iteration") \ 1794 \ 1795 product(uintx, CMSRescanMultiple, 32, \ 1796 "Size (in cards) of CMS parallel rescan task") \ 1797 \ 1798 product(uintx, CMSConcMarkMultiple, 32, \ 1799 "Size (in cards) of CMS concurrent MT marking task") \ 1800 \ 1801 product(bool, CMSAbortSemantics, false, \ 1802 "Whether abort-on-overflow semantics is implemented") \ 1803 \ 1804 product(bool, CMSParallelInitialMarkEnabled, true, \ 1805 "Use the parallel initial mark.") \ 1806 \ 1807 product(bool, CMSParallelRemarkEnabled, true, \ 1808 "Whether parallel remark enabled (only if ParNewGC)") \ 1809 \ 1810 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1811 "Whether parallel remark of survivor space " \ 1812 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1813 \ 1814 product(bool, CMSPLABRecordAlways, true, \ 1815 "Always record survivor space PLAB boundaries (effective only " \ 1816 "if CMSParallelSurvivorRemarkEnabled)") \ 1817 \ 1818 product(bool, CMSEdenChunksRecordAlways, true, \ 1819 "Always record eden chunks used for the parallel initial mark " \ 1820 "or remark of eden") \ 1821 \ 1822 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1823 "Print the eden and the survivor chunks used for the parallel " \ 1824 "initial mark or remark of the eden/survivor spaces") \ 1825 \ 1826 product(bool, CMSConcurrentMTEnabled, true, \ 1827 "Whether multi-threaded concurrent work enabled " \ 1828 "(effective only if ParNewGC)") \ 1829 \ 1830 product(bool, CMSPrecleaningEnabled, true, \ 1831 "Whether concurrent precleaning enabled") \ 1832 \ 1833 product(uintx, CMSPrecleanIter, 3, \ 1834 "Maximum number of precleaning iteration passes") \ 1835 \ 1836 product(uintx, CMSPrecleanNumerator, 2, \ 1837 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1838 "ratio") \ 1839 \ 1840 product(uintx, CMSPrecleanDenominator, 3, \ 1841 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1842 "ratio") \ 1843 \ 1844 product(bool, CMSPrecleanRefLists1, true, \ 1845 "Preclean ref lists during (initial) preclean phase") \ 1846 \ 1847 product(bool, CMSPrecleanRefLists2, false, \ 1848 "Preclean ref lists during abortable preclean phase") \ 1849 \ 1850 product(bool, CMSPrecleanSurvivors1, false, \ 1851 "Preclean survivors during (initial) preclean phase") \ 1852 \ 1853 product(bool, CMSPrecleanSurvivors2, true, \ 1854 "Preclean survivors during abortable preclean phase") \ 1855 \ 1856 product(uintx, CMSPrecleanThreshold, 1000, \ 1857 "Do not iterate again if number of dirty cards is less than this")\ 1858 \ 1859 product(bool, CMSCleanOnEnter, true, \ 1860 "Clean-on-enter optimization for reducing number of dirty cards") \ 1861 \ 1862 product(uintx, CMSRemarkVerifyVariant, 1, \ 1863 "Choose variant (1,2) of verification following remark") \ 1864 \ 1865 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1866 "If Eden size is below this, do not try to schedule remark") \ 1867 \ 1868 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1869 "The Eden occupancy percentage (0-100) at which " \ 1870 "to try and schedule remark pause") \ 1871 \ 1872 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1873 "Start sampling eden top at least before young gen " \ 1874 "occupancy reaches 1/<ratio> of the size at which " \ 1875 "we plan to schedule remark") \ 1876 \ 1877 product(uintx, CMSSamplingGrain, 16*K, \ 1878 "The minimum distance between eden samples for CMS (see above)") \ 1879 \ 1880 product(bool, CMSScavengeBeforeRemark, false, \ 1881 "Attempt scavenge before the CMS remark step") \ 1882 \ 1883 develop(bool, CMSTraceSweeper, false, \ 1884 "Trace some actions of the CMS sweeper") \ 1885 \ 1886 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1887 "Don't drain below this size per parallel worker/thief") \ 1888 \ 1889 manageable(intx, CMSWaitDuration, 2000, \ 1890 "Time in milliseconds that CMS thread waits for young GC") \ 1891 \ 1892 develop(uintx, CMSCheckInterval, 1000, \ 1893 "Interval in milliseconds that CMS thread checks if it " \ 1894 "should start a collection cycle") \ 1895 \ 1896 product(bool, CMSYield, true, \ 1897 "Yield between steps of CMS") \ 1898 \ 1899 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1900 "Bitmap operations should process at most this many bits " \ 1901 "between yields") \ 1902 \ 1903 product(bool, CMSDumpAtPromotionFailure, false, \ 1904 "Dump useful information about the state of the CMS old " \ 1905 "generation upon a promotion failure") \ 1906 \ 1907 product(bool, CMSPrintChunksInDump, false, \ 1908 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1909 "more detailed information about the free chunks") \ 1910 \ 1911 product(bool, CMSPrintObjectsInDump, false, \ 1912 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1913 "more detailed information about the allocated objects") \ 1914 \ 1915 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1916 "Verify that all references across the FLS boundary " \ 1917 "are to valid objects") \ 1918 \ 1919 diagnostic(bool, FLSVerifyLists, false, \ 1920 "Do lots of (expensive) FreeListSpace verification") \ 1921 \ 1922 diagnostic(bool, FLSVerifyIndexTable, false, \ 1923 "Do lots of (expensive) FLS index table verification") \ 1924 \ 1925 develop(bool, FLSVerifyDictionary, false, \ 1926 "Do lots of (expensive) FLS dictionary verification") \ 1927 \ 1928 develop(bool, VerifyBlockOffsetArray, false, \ 1929 "Do (expensive) block offset array verification") \ 1930 \ 1931 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1932 "Maintain _unallocated_block in BlockOffsetArray " \ 1933 "(currently applicable only to CMS collector)") \ 1934 \ 1935 develop(bool, TraceCMSState, false, \ 1936 "Trace the state of the CMS collection") \ 1937 \ 1938 product(intx, RefDiscoveryPolicy, 0, \ 1939 "Select type of reference discovery policy: " \ 1940 "reference-based(0) or referent-based(1)") \ 1941 \ 1942 product(bool, ParallelRefProcEnabled, false, \ 1943 "Enable parallel reference processing whenever possible") \ 1944 \ 1945 product(bool, ParallelRefProcBalancingEnabled, true, \ 1946 "Enable balancing of reference processing queues") \ 1947 \ 1948 product(uintx, CMSTriggerRatio, 80, \ 1949 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1950 "allocated before a CMS collection cycle commences") \ 1951 \ 1952 product(uintx, CMSBootstrapOccupancy, 50, \ 1953 "Percentage CMS generation occupancy at which to " \ 1954 "initiate CMS collection for bootstrapping collection stats") \ 1955 \ 1956 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1957 "Percentage CMS generation occupancy to start a CMS collection " \ 1958 "cycle. A negative value means that CMSTriggerRatio is used") \ 1959 \ 1960 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1961 "Percentage of the (entire) heap occupancy to start a " \ 1962 "concurrent GC cycle. It is used by GCs that trigger a " \ 1963 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1964 "not just one of the generations (e.g., G1). A value of 0 " \ 1965 "denotes 'do constant GC cycles'.") \ 1966 \ 1967 manageable(intx, CMSTriggerInterval, -1, \ 1968 "Commence a CMS collection cycle (at least) every so many " \ 1969 "milliseconds (0 permanently, -1 disabled)") \ 1970 \ 1971 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1972 "Only use occupancy as a criterion for starting a CMS collection")\ 1973 \ 1974 product(uintx, CMSIsTooFullPercentage, 98, \ 1975 "An absolute ceiling above which CMS will always consider the " \ 1976 "unloading of classes when class unloading is enabled") \ 1977 \ 1978 develop(bool, CMSTestInFreeList, false, \ 1979 "Check if the coalesced range is already in the " \ 1980 "free lists as claimed") \ 1981 \ 1982 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1983 "Check that all the garbage collected was returned to the " \ 1984 "free lists") \ 1985 \ 1986 notproduct(bool, ScavengeALot, false, \ 1987 "Force scavenge at every Nth exit from the runtime system " \ 1988 "(N=ScavengeALotInterval)") \ 1989 \ 1990 develop(bool, FullGCALot, false, \ 1991 "Force full gc at every Nth exit from the runtime system " \ 1992 "(N=FullGCALotInterval)") \ 1993 \ 1994 notproduct(bool, GCALotAtAllSafepoints, false, \ 1995 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1996 \ 1997 product(bool, PrintPromotionFailure, false, \ 1998 "Print additional diagnostic information following " \ 1999 "promotion failure") \ 2000 \ 2001 notproduct(bool, PromotionFailureALot, false, \ 2002 "Use promotion failure handling on every youngest generation " \ 2003 "collection") \ 2004 \ 2005 develop(uintx, PromotionFailureALotCount, 1000, \ 2006 "Number of promotion failures occurring at ParGCAllocBuffer " \ 2007 "refill attempts (ParNew) or promotion attempts " \ 2008 "(other young collectors)") \ 2009 \ 2010 develop(uintx, PromotionFailureALotInterval, 5, \ 2011 "Total collections between promotion failures alot") \ 2012 \ 2013 experimental(uintx, WorkStealingSleepMillis, 1, \ 2014 "Sleep time when sleep is used for yields") \ 2015 \ 2016 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2017 "Number of yields before a sleep is done during workstealing") \ 2018 \ 2019 experimental(uintx, WorkStealingHardSpins, 4096, \ 2020 "Number of iterations in a spin loop between checks on " \ 2021 "time out of hard spin") \ 2022 \ 2023 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2024 "Ratio of hard spins to calls to yield") \ 2025 \ 2026 develop(uintx, ObjArrayMarkingStride, 512, \ 2027 "Number of object array elements to push onto the marking stack " \ 2028 "before pushing a continuation entry") \ 2029 \ 2030 develop(bool, MetadataAllocationFailALot, false, \ 2031 "Fail metadata allocations at intervals controlled by " \ 2032 "MetadataAllocationFailALotInterval") \ 2033 \ 2034 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2035 "Metadata allocation failure a lot interval") \ 2036 \ 2037 develop(bool, TraceMetadataChunkAllocation, false, \ 2038 "Trace chunk metadata allocations") \ 2039 \ 2040 product(bool, TraceMetadataHumongousAllocation, false, \ 2041 "Trace humongous metadata allocations") \ 2042 \ 2043 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2044 "Trace virtual space metadata allocations") \ 2045 \ 2046 notproduct(bool, ExecuteInternalVMTests, false, \ 2047 "Enable execution of internal VM tests") \ 2048 \ 2049 notproduct(bool, VerboseInternalVMTests, false, \ 2050 "Turn on logging for internal VM tests.") \ 2051 \ 2052 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2053 \ 2054 product_pd(bool, ResizeTLAB, \ 2055 "Dynamically resize TLAB size for threads") \ 2056 \ 2057 product(bool, ZeroTLAB, false, \ 2058 "Zero out the newly created TLAB") \ 2059 \ 2060 product(bool, FastTLABRefill, true, \ 2061 "Use fast TLAB refill code") \ 2062 \ 2063 product(bool, PrintTLAB, false, \ 2064 "Print various TLAB related information") \ 2065 \ 2066 product(bool, TLABStats, true, \ 2067 "Provide more detailed and expensive TLAB statistics " \ 2068 "(with PrintTLAB)") \ 2069 \ 2070 product_pd(bool, NeverActAsServerClassMachine, \ 2071 "Never act like a server-class machine") \ 2072 \ 2073 product(bool, AlwaysActAsServerClassMachine, false, \ 2074 "Always act like a server-class machine") \ 2075 \ 2076 product_pd(uint64_t, MaxRAM, \ 2077 "Real memory size (in bytes) used to set maximum heap size") \ 2078 \ 2079 product(uintx, ErgoHeapSizeLimit, 0, \ 2080 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2081 "MaxRAM / MaxRAMFraction") \ 2082 \ 2083 product(uintx, MaxRAMFraction, 4, \ 2084 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2085 "size") \ 2086 \ 2087 product(uintx, DefaultMaxRAMFraction, 4, \ 2088 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2089 "size; deprecated: to be renamed to MaxRAMFraction") \ 2090 \ 2091 product(uintx, MinRAMFraction, 2, \ 2092 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2093 "size on systems with small physical memory size") \ 2094 \ 2095 product(uintx, InitialRAMFraction, 64, \ 2096 "Fraction (1/n) of real memory used for initial heap size") \ 2097 \ 2098 develop(uintx, MaxVirtMemFraction, 2, \ 2099 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2100 "determining maximum heap size") \ 2101 \ 2102 product(bool, UseAutoGCSelectPolicy, false, \ 2103 "Use automatic collection selection policy") \ 2104 \ 2105 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2106 "Automatic GC selection pause threshold in milliseconds") \ 2107 \ 2108 product(bool, UseAdaptiveSizePolicy, true, \ 2109 "Use adaptive generation sizing policies") \ 2110 \ 2111 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2112 "Use adaptive survivor sizing policies") \ 2113 \ 2114 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2115 "Use adaptive young-old sizing policies at minor collections") \ 2116 \ 2117 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2118 "Use adaptive young-old sizing policies at major collections") \ 2119 \ 2120 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2121 "Include statistics from System.gc() for adaptive size policy") \ 2122 \ 2123 product(bool, UseAdaptiveGCBoundary, false, \ 2124 "Allow young-old boundary to move") \ 2125 \ 2126 develop(bool, TraceAdaptiveGCBoundary, false, \ 2127 "Trace young-old boundary moves") \ 2128 \ 2129 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2130 "Resize the virtual spaces of the young or old generations") \ 2131 \ 2132 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2133 "Policy for changing generation size for throughput goals") \ 2134 \ 2135 product(uintx, AdaptiveSizePausePolicy, 0, \ 2136 "Policy for changing generation size for pause goals") \ 2137 \ 2138 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2139 "Adjust tenured generation to achieve a minor pause goal") \ 2140 \ 2141 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2142 "Adjust young generation to achieve a major pause goal") \ 2143 \ 2144 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2145 "Number of steps where heuristics is used before data is used") \ 2146 \ 2147 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2148 "Number of collections before the adaptive sizing is started") \ 2149 \ 2150 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2151 "Collection interval for printing information; zero means never") \ 2152 \ 2153 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2154 "Use adaptive minimum footprint as a goal") \ 2155 \ 2156 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2157 "Weight given to exponential resizing, between 0 and 100") \ 2158 \ 2159 product(uintx, AdaptiveTimeWeight, 25, \ 2160 "Weight given to time in adaptive policy, between 0 and 100") \ 2161 \ 2162 product(uintx, PausePadding, 1, \ 2163 "How much buffer to keep for pause time") \ 2164 \ 2165 product(uintx, PromotedPadding, 3, \ 2166 "How much buffer to keep for promotion failure") \ 2167 \ 2168 product(uintx, SurvivorPadding, 3, \ 2169 "How much buffer to keep for survivor overflow") \ 2170 \ 2171 product(uintx, ThresholdTolerance, 10, \ 2172 "Allowed collection cost difference between generations") \ 2173 \ 2174 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2175 "If collection costs are within margin, reduce both by full " \ 2176 "delta") \ 2177 \ 2178 product(uintx, YoungGenerationSizeIncrement, 20, \ 2179 "Adaptive size percentage change in young generation") \ 2180 \ 2181 product(uintx, YoungGenerationSizeSupplement, 80, \ 2182 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2183 \ 2184 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2185 "Decay factor to YoungedGenerationSizeSupplement") \ 2186 \ 2187 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2188 "Adaptive size percentage change in tenured generation") \ 2189 \ 2190 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2191 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2192 \ 2193 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2194 "Decay factor to TenuredGenerationSizeIncrement") \ 2195 \ 2196 product(uintx, MaxGCPauseMillis, max_uintx, \ 2197 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2198 "or (G1 Only) the maximum GC time per MMU time slice") \ 2199 \ 2200 product(uintx, GCPauseIntervalMillis, 0, \ 2201 "Time slice for MMU specification") \ 2202 \ 2203 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2204 "Adaptive size policy maximum GC minor pause time goal " \ 2205 "in millisecond") \ 2206 \ 2207 product(uintx, GCTimeRatio, 99, \ 2208 "Adaptive size policy application time to GC time ratio") \ 2209 \ 2210 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2211 "Adaptive size scale down factor for shrinking") \ 2212 \ 2213 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2214 "Adaptive size decays the major cost for long major intervals") \ 2215 \ 2216 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2217 "Time scale over which major costs decay") \ 2218 \ 2219 product(uintx, MinSurvivorRatio, 3, \ 2220 "Minimum ratio of young generation/survivor space size") \ 2221 \ 2222 product(uintx, InitialSurvivorRatio, 8, \ 2223 "Initial ratio of young generation/survivor space size") \ 2224 \ 2225 product(uintx, BaseFootPrintEstimate, 256*M, \ 2226 "Estimate of footprint other than Java Heap") \ 2227 \ 2228 product(bool, UseGCOverheadLimit, true, \ 2229 "Use policy to limit of proportion of time spent in GC " \ 2230 "before an OutOfMemory error is thrown") \ 2231 \ 2232 product(uintx, GCTimeLimit, 98, \ 2233 "Limit of the proportion of time spent in GC before " \ 2234 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2235 \ 2236 product(uintx, GCHeapFreeLimit, 2, \ 2237 "Minimum percentage of free space after a full GC before an " \ 2238 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2239 \ 2240 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2241 "Number of consecutive collections before gc time limit fires") \ 2242 \ 2243 product(bool, PrintAdaptiveSizePolicy, false, \ 2244 "Print information about AdaptiveSizePolicy") \ 2245 \ 2246 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2247 "How far ahead to prefetch destination area (<= 0 means off)") \ 2248 \ 2249 product(intx, PrefetchScanIntervalInBytes, -1, \ 2250 "How far ahead to prefetch scan area (<= 0 means off)") \ 2251 \ 2252 product(intx, PrefetchFieldsAhead, -1, \ 2253 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2254 \ 2255 diagnostic(bool, VerifySilently, false, \ 2256 "Do not print the verification progress") \ 2257 \ 2258 diagnostic(bool, VerifyDuringStartup, false, \ 2259 "Verify memory system before executing any Java code " \ 2260 "during VM initialization") \ 2261 \ 2262 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2263 "Verify system before exiting") \ 2264 \ 2265 diagnostic(bool, VerifyBeforeGC, false, \ 2266 "Verify memory system before GC") \ 2267 \ 2268 diagnostic(bool, VerifyAfterGC, false, \ 2269 "Verify memory system after GC") \ 2270 \ 2271 diagnostic(bool, VerifyDuringGC, false, \ 2272 "Verify memory system during GC (between phases)") \ 2273 \ 2274 diagnostic(ccstrlist, VerifySubSet, "", \ 2275 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2276 "are enabled. One or more sub-systems can be specified " \ 2277 "in a comma separated string. Sub-systems are: " \ 2278 "threads, heap, symbol_table, string_table, codecache, " \ 2279 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2280 "c-heap, codecache_oops") \ 2281 \ 2282 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2283 "Enable parallel memory system verification") \ 2284 \ 2285 diagnostic(bool, DeferInitialCardMark, false, \ 2286 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2287 "may arise from new_pre_store_barrier") \ 2288 \ 2289 diagnostic(bool, VerifyRememberedSets, false, \ 2290 "Verify GC remembered sets") \ 2291 \ 2292 diagnostic(bool, VerifyObjectStartArray, true, \ 2293 "Verify GC object start array if verify before/after") \ 2294 \ 2295 product(bool, DisableExplicitGC, false, \ 2296 "Ignore calls to System.gc()") \ 2297 \ 2298 notproduct(bool, CheckMemoryInitialization, false, \ 2299 "Check memory initialization") \ 2300 \ 2301 product(bool, CollectGen0First, false, \ 2302 "Collect youngest generation before each full GC") \ 2303 \ 2304 diagnostic(bool, BindCMSThreadToCPU, false, \ 2305 "Bind CMS Thread to CPU if possible") \ 2306 \ 2307 diagnostic(uintx, CPUForCMSThread, 0, \ 2308 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2309 \ 2310 product(bool, BindGCTaskThreadsToCPUs, false, \ 2311 "Bind GCTaskThreads to CPUs if possible") \ 2312 \ 2313 product(bool, UseGCTaskAffinity, false, \ 2314 "Use worker affinity when asking for GCTasks") \ 2315 \ 2316 product(uintx, ProcessDistributionStride, 4, \ 2317 "Stride through processors when distributing processes") \ 2318 \ 2319 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2320 "Number of times the coordinator GC thread will sleep while " \ 2321 "yielding before giving up and resuming GC") \ 2322 \ 2323 product(uintx, CMSYieldSleepCount, 0, \ 2324 "Number of times a GC thread (minus the coordinator) " \ 2325 "will sleep while yielding before giving up and resuming GC") \ 2326 \ 2327 /* gc tracing */ \ 2328 manageable(bool, PrintGC, false, \ 2329 "Print message at garbage collection") \ 2330 \ 2331 manageable(bool, PrintGCDetails, false, \ 2332 "Print more details at garbage collection") \ 2333 \ 2334 manageable(bool, PrintGCDateStamps, false, \ 2335 "Print date stamps at garbage collection") \ 2336 \ 2337 manageable(bool, PrintGCTimeStamps, false, \ 2338 "Print timestamps at garbage collection") \ 2339 \ 2340 manageable(bool, PrintGCID, false, \ 2341 "Print an identifier for each garbage collection") \ 2342 \ 2343 product(bool, PrintGCTaskTimeStamps, false, \ 2344 "Print timestamps for individual gc worker thread tasks") \ 2345 \ 2346 develop(intx, ConcGCYieldTimeout, 0, \ 2347 "If non-zero, assert that GC threads yield within this " \ 2348 "number of milliseconds") \ 2349 \ 2350 notproduct(bool, TraceMarkSweep, false, \ 2351 "Trace mark sweep") \ 2352 \ 2353 product(bool, PrintReferenceGC, false, \ 2354 "Print times spent handling reference objects during GC " \ 2355 "(enabled only when PrintGCDetails)") \ 2356 \ 2357 develop(bool, TraceReferenceGC, false, \ 2358 "Trace handling of soft/weak/final/phantom references") \ 2359 \ 2360 develop(bool, TraceFinalizerRegistration, false, \ 2361 "Trace registration of final references") \ 2362 \ 2363 notproduct(bool, TraceScavenge, false, \ 2364 "Trace scavenge") \ 2365 \ 2366 product(bool, IgnoreEmptyClassPaths, false, \ 2367 "Ignore empty path elements in -classpath") \ 2368 \ 2369 product(bool, TraceClassPaths, false, \ 2370 "Trace processing of class paths") \ 2371 \ 2372 product_rw(bool, TraceClassLoading, false, \ 2373 "Trace all classes loaded") \ 2374 \ 2375 product(bool, TraceClassLoadingPreorder, false, \ 2376 "Trace all classes loaded in order referenced (not loaded)") \ 2377 \ 2378 product_rw(bool, TraceClassUnloading, false, \ 2379 "Trace unloading of classes") \ 2380 \ 2381 product_rw(bool, TraceLoaderConstraints, false, \ 2382 "Trace loader constraints") \ 2383 \ 2384 develop(bool, TraceClassLoaderData, false, \ 2385 "Trace class loader loader_data lifetime") \ 2386 \ 2387 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2388 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2389 "Initial size of the boot class loader data metaspace") \ 2390 \ 2391 product(bool, TraceGen0Time, false, \ 2392 "Trace accumulated time for Gen 0 collection") \ 2393 \ 2394 product(bool, TraceGen1Time, false, \ 2395 "Trace accumulated time for Gen 1 collection") \ 2396 \ 2397 product(bool, PrintTenuringDistribution, false, \ 2398 "Print tenuring age information") \ 2399 \ 2400 product_rw(bool, PrintHeapAtGC, false, \ 2401 "Print heap layout before and after each GC") \ 2402 \ 2403 product_rw(bool, PrintHeapAtGCExtended, false, \ 2404 "Print extended information about the layout of the heap " \ 2405 "when -XX:+PrintHeapAtGC is set") \ 2406 \ 2407 product(bool, PrintHeapAtSIGBREAK, true, \ 2408 "Print heap layout in response to SIGBREAK") \ 2409 \ 2410 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2411 "Print a class histogram before any major stop-world GC") \ 2412 \ 2413 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2414 "Print a class histogram after any major stop-world GC") \ 2415 \ 2416 manageable(bool, PrintClassHistogram, false, \ 2417 "Print a histogram of class instances") \ 2418 \ 2419 develop(bool, TraceWorkGang, false, \ 2420 "Trace activities of work gangs") \ 2421 \ 2422 product(bool, TraceParallelOldGCTasks, false, \ 2423 "Trace multithreaded GC activity") \ 2424 \ 2425 develop(bool, TraceBlockOffsetTable, false, \ 2426 "Print BlockOffsetTable maps") \ 2427 \ 2428 develop(bool, TraceCardTableModRefBS, false, \ 2429 "Print CardTableModRefBS maps") \ 2430 \ 2431 develop(bool, TraceGCTaskManager, false, \ 2432 "Trace actions of the GC task manager") \ 2433 \ 2434 develop(bool, TraceGCTaskQueue, false, \ 2435 "Trace actions of the GC task queues") \ 2436 \ 2437 diagnostic(bool, TraceGCTaskThread, false, \ 2438 "Trace actions of the GC task threads") \ 2439 \ 2440 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2441 "Print the time taken by each phase in ParallelOldGC " \ 2442 "(PrintGCDetails must also be enabled)") \ 2443 \ 2444 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2445 "Trace marking phase in ParallelOldGC") \ 2446 \ 2447 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2448 "Trace summary phase in ParallelOldGC") \ 2449 \ 2450 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2451 "Trace compaction phase in ParallelOldGC") \ 2452 \ 2453 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2454 "Trace dense prefix computation for ParallelOldGC") \ 2455 \ 2456 develop(bool, IgnoreLibthreadGPFault, false, \ 2457 "Suppress workaround for libthread GP fault") \ 2458 \ 2459 product(bool, PrintJNIGCStalls, false, \ 2460 "Print diagnostic message when GC is stalled " \ 2461 "by JNI critical section") \ 2462 \ 2463 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2464 "The percentage of the used heap that the instances of a class " \ 2465 "must occupy for the class to generate a trace event") \ 2466 \ 2467 /* GC log rotation setting */ \ 2468 \ 2469 product(bool, UseGCLogFileRotation, false, \ 2470 "Rotate gclog files (for long running applications). It requires "\ 2471 "-Xloggc:<filename>") \ 2472 \ 2473 product(uintx, NumberOfGCLogFiles, 0, \ 2474 "Number of gclog files in rotation " \ 2475 "(default: 0, no rotation)") \ 2476 \ 2477 product(uintx, GCLogFileSize, 8*K, \ 2478 "GC log file size, requires UseGCLogFileRotation. " \ 2479 "Set to 0 to only trigger rotation via jcmd") \ 2480 \ 2481 /* JVMTI heap profiling */ \ 2482 \ 2483 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2484 "Trace JVMTI object tagging calls") \ 2485 \ 2486 diagnostic(bool, VerifyBeforeIteration, false, \ 2487 "Verify memory system before JVMTI iteration") \ 2488 \ 2489 /* compiler interface */ \ 2490 \ 2491 develop(bool, CIPrintCompilerName, false, \ 2492 "when CIPrint is active, print the name of the active compiler") \ 2493 \ 2494 develop(bool, CIPrintCompileQueue, false, \ 2495 "display the contents of the compile queue whenever a " \ 2496 "compilation is enqueued") \ 2497 \ 2498 develop(bool, CIPrintRequests, false, \ 2499 "display every request for compilation") \ 2500 \ 2501 product(bool, CITime, false, \ 2502 "collect timing information for compilation") \ 2503 \ 2504 develop(bool, CITimeEach, false, \ 2505 "display timing information after each successful compilation") \ 2506 \ 2507 develop(bool, CICountOSR, false, \ 2508 "use a separate counter when assigning ids to osr compilations") \ 2509 \ 2510 develop(bool, CICompileNatives, true, \ 2511 "compile native methods if supported by the compiler") \ 2512 \ 2513 develop_pd(bool, CICompileOSR, \ 2514 "compile on stack replacement methods if supported by the " \ 2515 "compiler") \ 2516 \ 2517 develop(bool, CIPrintMethodCodes, false, \ 2518 "print method bytecodes of the compiled code") \ 2519 \ 2520 develop(bool, CIPrintTypeFlow, false, \ 2521 "print the results of ciTypeFlow analysis") \ 2522 \ 2523 develop(bool, CITraceTypeFlow, false, \ 2524 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2525 \ 2526 develop(intx, OSROnlyBCI, -1, \ 2527 "OSR only at this bci. Negative values mean exclude that bci") \ 2528 \ 2529 /* compiler */ \ 2530 \ 2531 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2532 "Number of compiler threads to run") \ 2533 \ 2534 product(intx, CompilationPolicyChoice, 0, \ 2535 "which compilation policy (0/1)") \ 2536 \ 2537 develop(bool, UseStackBanging, true, \ 2538 "use stack banging for stack overflow checks (required for " \ 2539 "proper StackOverflow handling; disable only to measure cost " \ 2540 "of stackbanging)") \ 2541 \ 2542 develop(bool, UseStrictFP, true, \ 2543 "use strict fp if modifier strictfp is set") \ 2544 \ 2545 develop(bool, GenerateSynchronizationCode, true, \ 2546 "generate locking/unlocking code for synchronized methods and " \ 2547 "monitors") \ 2548 \ 2549 develop(bool, GenerateCompilerNullChecks, true, \ 2550 "Generate explicit null checks for loads/stores/calls") \ 2551 \ 2552 develop(bool, GenerateRangeChecks, true, \ 2553 "Generate range checks for array accesses") \ 2554 \ 2555 develop_pd(bool, ImplicitNullChecks, \ 2556 "Generate code for implicit null checks") \ 2557 \ 2558 product_pd(bool, TrapBasedNullChecks, \ 2559 "Generate code for null checks that uses a cmp and trap " \ 2560 "instruction raising SIGTRAP. This is only used if an access to" \ 2561 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2562 "ImplicitNullChecks don't work (PPC64).") \ 2563 \ 2564 product(bool, PrintSafepointStatistics, false, \ 2565 "Print statistics about safepoint synchronization") \ 2566 \ 2567 product(intx, PrintSafepointStatisticsCount, 300, \ 2568 "Total number of safepoint statistics collected " \ 2569 "before printing them out") \ 2570 \ 2571 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2572 "Print safepoint statistics only when safepoint takes " \ 2573 "more than PrintSafepointSatisticsTimeout in millis") \ 2574 \ 2575 product(bool, TraceSafepointCleanupTime, false, \ 2576 "Print the break down of clean up tasks performed during " \ 2577 "safepoint") \ 2578 \ 2579 product(bool, Inline, true, \ 2580 "Enable inlining") \ 2581 \ 2582 product(bool, ClipInlining, true, \ 2583 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2584 \ 2585 develop(bool, UseCHA, true, \ 2586 "Enable CHA") \ 2587 \ 2588 product(bool, UseTypeProfile, true, \ 2589 "Check interpreter profile for historically monomorphic calls") \ 2590 \ 2591 notproduct(bool, TimeCompiler, false, \ 2592 "Time the compiler") \ 2593 \ 2594 diagnostic(bool, PrintInlining, false, \ 2595 "Print inlining optimizations") \ 2596 \ 2597 product(bool, UsePopCountInstruction, false, \ 2598 "Use population count instruction") \ 2599 \ 2600 develop(bool, EagerInitialization, false, \ 2601 "Eagerly initialize classes if possible") \ 2602 \ 2603 develop(bool, TraceMethodReplacement, false, \ 2604 "Print when methods are replaced do to recompilation") \ 2605 \ 2606 develop(bool, PrintMethodFlushing, false, \ 2607 "Print the nmethods being flushed") \ 2608 \ 2609 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2610 "print statistics about method flushing") \ 2611 \ 2612 develop(bool, UseRelocIndex, false, \ 2613 "Use an index to speed random access to relocations") \ 2614 \ 2615 develop(bool, StressCodeBuffers, false, \ 2616 "Exercise code buffer expansion and other rare state changes") \ 2617 \ 2618 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2619 "Generate extra debugging information for non-safepoints in " \ 2620 "nmethods") \ 2621 \ 2622 product(bool, PrintVMOptions, false, \ 2623 "Print flags that appeared on the command line") \ 2624 \ 2625 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2626 "Ignore unrecognized VM options") \ 2627 \ 2628 product(bool, PrintCommandLineFlags, false, \ 2629 "Print flags specified on command line or set by ergonomics") \ 2630 \ 2631 product(bool, PrintFlagsInitial, false, \ 2632 "Print all VM flags before argument processing and exit VM") \ 2633 \ 2634 product(bool, PrintFlagsFinal, false, \ 2635 "Print all VM flags after argument and ergonomic processing") \ 2636 \ 2637 notproduct(bool, PrintFlagsWithComments, false, \ 2638 "Print all VM flags with default values and descriptions and " \ 2639 "exit") \ 2640 \ 2641 diagnostic(bool, SerializeVMOutput, true, \ 2642 "Use a mutex to serialize output to tty and LogFile") \ 2643 \ 2644 diagnostic(bool, DisplayVMOutput, true, \ 2645 "Display all VM output on the tty, independently of LogVMOutput") \ 2646 \ 2647 diagnostic(bool, LogVMOutput, false, \ 2648 "Save VM output to LogFile") \ 2649 \ 2650 diagnostic(ccstr, LogFile, NULL, \ 2651 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2652 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2653 \ 2654 product(ccstr, ErrorFile, NULL, \ 2655 "If an error occurs, save the error data to this file " \ 2656 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2657 \ 2658 product(bool, DisplayVMOutputToStderr, false, \ 2659 "If DisplayVMOutput is true, display all VM output to stderr") \ 2660 \ 2661 product(bool, DisplayVMOutputToStdout, false, \ 2662 "If DisplayVMOutput is true, display all VM output to stdout") \ 2663 \ 2664 product(bool, UseHeavyMonitors, false, \ 2665 "use heavyweight instead of lightweight Java monitors") \ 2666 \ 2667 product(bool, PrintStringTableStatistics, false, \ 2668 "print statistics about the StringTable and SymbolTable") \ 2669 \ 2670 diagnostic(bool, VerifyStringTableAtExit, false, \ 2671 "verify StringTable contents at exit") \ 2672 \ 2673 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2674 "print histogram of the symbol table") \ 2675 \ 2676 notproduct(bool, ExitVMOnVerifyError, false, \ 2677 "standard exit from VM if bytecode verify error " \ 2678 "(only in debug mode)") \ 2679 \ 2680 notproduct(ccstr, AbortVMOnException, NULL, \ 2681 "Call fatal if this exception is thrown. Example: " \ 2682 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2683 \ 2684 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2685 "Call fatal if the exception pointed by AbortVMOnException " \ 2686 "has this message") \ 2687 \ 2688 develop(bool, DebugVtables, false, \ 2689 "add debugging code to vtable dispatch") \ 2690 \ 2691 develop(bool, PrintVtables, false, \ 2692 "print vtables when printing klass") \ 2693 \ 2694 notproduct(bool, PrintVtableStats, false, \ 2695 "print vtables stats at end of run") \ 2696 \ 2697 develop(bool, TraceCreateZombies, false, \ 2698 "trace creation of zombie nmethods") \ 2699 \ 2700 notproduct(bool, IgnoreLockingAssertions, false, \ 2701 "disable locking assertions (for speed)") \ 2702 \ 2703 product(bool, RangeCheckElimination, true, \ 2704 "Eliminate range checks") \ 2705 \ 2706 develop_pd(bool, UncommonNullCast, \ 2707 "track occurrences of null in casts; adjust compiler tactics") \ 2708 \ 2709 develop(bool, TypeProfileCasts, true, \ 2710 "treat casts like calls for purposes of type profiling") \ 2711 \ 2712 develop(bool, DelayCompilationDuringStartup, true, \ 2713 "Delay invoking the compiler until main application class is " \ 2714 "loaded") \ 2715 \ 2716 develop(bool, CompileTheWorld, false, \ 2717 "Compile all methods in all classes in bootstrap class path " \ 2718 "(stress test)") \ 2719 \ 2720 develop(bool, CompileTheWorldPreloadClasses, true, \ 2721 "Preload all classes used by a class before start loading") \ 2722 \ 2723 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2724 "Force a safepoint every n compiles so sweeper can keep up") \ 2725 \ 2726 develop(bool, FillDelaySlots, true, \ 2727 "Fill delay slots (on SPARC only)") \ 2728 \ 2729 develop(bool, TimeLivenessAnalysis, false, \ 2730 "Time computation of bytecode liveness analysis") \ 2731 \ 2732 develop(bool, TraceLivenessGen, false, \ 2733 "Trace the generation of liveness analysis information") \ 2734 \ 2735 notproduct(bool, TraceLivenessQuery, false, \ 2736 "Trace queries of liveness analysis information") \ 2737 \ 2738 notproduct(bool, CollectIndexSetStatistics, false, \ 2739 "Collect information about IndexSets") \ 2740 \ 2741 develop(bool, UseLoopSafepoints, true, \ 2742 "Generate Safepoint nodes in every loop") \ 2743 \ 2744 develop(intx, FastAllocateSizeLimit, 128*K, \ 2745 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2746 "Inline allocations larger than this in doublewords must go slow")\ 2747 \ 2748 product(bool, AggressiveOpts, false, \ 2749 "Enable aggressive optimizations - see arguments.cpp") \ 2750 \ 2751 product_pd(uintx, TypeProfileLevel, \ 2752 "=XYZ, with Z: Type profiling of arguments at call; " \ 2753 "Y: Type profiling of return value at call; " \ 2754 "X: Type profiling of parameters to methods; " \ 2755 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2756 \ 2757 product(intx, TypeProfileArgsLimit, 2, \ 2758 "max number of call arguments to consider for type profiling") \ 2759 \ 2760 product(intx, TypeProfileParmsLimit, 2, \ 2761 "max number of incoming parameters to consider for type profiling"\ 2762 ", -1 for all") \ 2763 \ 2764 /* statistics */ \ 2765 develop(bool, CountCompiledCalls, false, \ 2766 "Count method invocations") \ 2767 \ 2768 notproduct(bool, CountRuntimeCalls, false, \ 2769 "Count VM runtime calls") \ 2770 \ 2771 develop(bool, CountJNICalls, false, \ 2772 "Count jni method invocations") \ 2773 \ 2774 notproduct(bool, CountJVMCalls, false, \ 2775 "Count jvm method invocations") \ 2776 \ 2777 notproduct(bool, CountRemovableExceptions, false, \ 2778 "Count exceptions that could be replaced by branches due to " \ 2779 "inlining") \ 2780 \ 2781 notproduct(bool, ICMissHistogram, false, \ 2782 "Produce histogram of IC misses") \ 2783 \ 2784 notproduct(bool, PrintClassStatistics, false, \ 2785 "Print class statistics at end of run") \ 2786 \ 2787 notproduct(bool, PrintMethodStatistics, false, \ 2788 "Print method statistics at end of run") \ 2789 \ 2790 /* interpreter */ \ 2791 develop(bool, ClearInterpreterLocals, false, \ 2792 "Always clear local variables of interpreter activations upon " \ 2793 "entry") \ 2794 \ 2795 product_pd(bool, RewriteBytecodes, \ 2796 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2797 \ 2798 product_pd(bool, RewriteFrequentPairs, \ 2799 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2800 \ 2801 diagnostic(bool, PrintInterpreter, false, \ 2802 "Print the generated interpreter code") \ 2803 \ 2804 product(bool, UseInterpreter, true, \ 2805 "Use interpreter for non-compiled methods") \ 2806 \ 2807 develop(bool, UseFastSignatureHandlers, true, \ 2808 "Use fast signature handlers for native calls") \ 2809 \ 2810 product(bool, UseLoopCounter, true, \ 2811 "Increment invocation counter on backward branch") \ 2812 \ 2813 product(bool, UseFastEmptyMethods, true, \ 2814 "Use fast method entry code for empty methods") \ 2815 \ 2816 product(bool, UseFastAccessorMethods, true, \ 2817 "Use fast method entry code for accessor methods") \ 2818 \ 2819 product_pd(bool, UseOnStackReplacement, \ 2820 "Use on stack replacement, calls runtime if invoc. counter " \ 2821 "overflows in loop") \ 2822 \ 2823 notproduct(bool, TraceOnStackReplacement, false, \ 2824 "Trace on stack replacement") \ 2825 \ 2826 product_pd(bool, PreferInterpreterNativeStubs, \ 2827 "Use always interpreter stubs for native methods invoked via " \ 2828 "interpreter") \ 2829 \ 2830 develop(bool, CountBytecodes, false, \ 2831 "Count number of bytecodes executed") \ 2832 \ 2833 develop(bool, PrintBytecodeHistogram, false, \ 2834 "Print histogram of the executed bytecodes") \ 2835 \ 2836 develop(bool, PrintBytecodePairHistogram, false, \ 2837 "Print histogram of the executed bytecode pairs") \ 2838 \ 2839 diagnostic(bool, PrintSignatureHandlers, false, \ 2840 "Print code generated for native method signature handlers") \ 2841 \ 2842 develop(bool, VerifyOops, false, \ 2843 "Do plausibility checks for oops") \ 2844 \ 2845 develop(bool, CheckUnhandledOops, false, \ 2846 "Check for unhandled oops in VM code") \ 2847 \ 2848 develop(bool, VerifyJNIFields, trueInDebug, \ 2849 "Verify jfieldIDs for instance fields") \ 2850 \ 2851 notproduct(bool, VerifyJNIEnvThread, false, \ 2852 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2853 "from JNI") \ 2854 \ 2855 develop(bool, VerifyFPU, false, \ 2856 "Verify FPU state (check for NaN's, etc.)") \ 2857 \ 2858 develop(bool, VerifyThread, false, \ 2859 "Watch the thread register for corruption (SPARC only)") \ 2860 \ 2861 develop(bool, VerifyActivationFrameSize, false, \ 2862 "Verify that activation frame didn't become smaller than its " \ 2863 "minimal size") \ 2864 \ 2865 develop(bool, TraceFrequencyInlining, false, \ 2866 "Trace frequency based inlining") \ 2867 \ 2868 develop_pd(bool, InlineIntrinsics, \ 2869 "Inline intrinsics that can be statically resolved") \ 2870 \ 2871 product_pd(bool, ProfileInterpreter, \ 2872 "Profile at the bytecode level during interpretation") \ 2873 \ 2874 develop(bool, TraceProfileInterpreter, false, \ 2875 "Trace profiling at the bytecode level during interpretation. " \ 2876 "This outputs the profiling information collected to improve " \ 2877 "jit compilation.") \ 2878 \ 2879 develop_pd(bool, ProfileTraps, \ 2880 "Profile deoptimization traps at the bytecode level") \ 2881 \ 2882 product(intx, ProfileMaturityPercentage, 20, \ 2883 "number of method invocations/branches (expressed as % of " \ 2884 "CompileThreshold) before using the method's profile") \ 2885 \ 2886 develop(bool, PrintMethodData, false, \ 2887 "Print the results of +ProfileInterpreter at end of run") \ 2888 \ 2889 develop(bool, VerifyDataPointer, trueInDebug, \ 2890 "Verify the method data pointer during interpreter profiling") \ 2891 \ 2892 develop(bool, VerifyCompiledCode, false, \ 2893 "Include miscellaneous runtime verifications in nmethod code; " \ 2894 "default off because it disturbs nmethod size heuristics") \ 2895 \ 2896 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2897 "Manually make GC thread crash then dump java stack trace; " \ 2898 "Test only") \ 2899 \ 2900 /* compilation */ \ 2901 product(bool, UseCompiler, true, \ 2902 "Use Just-In-Time compilation") \ 2903 \ 2904 develop(bool, TraceCompilationPolicy, false, \ 2905 "Trace compilation policy") \ 2906 \ 2907 develop(bool, TimeCompilationPolicy, false, \ 2908 "Time the compilation policy") \ 2909 \ 2910 product(bool, UseCounterDecay, true, \ 2911 "Adjust recompilation counters") \ 2912 \ 2913 develop(intx, CounterHalfLifeTime, 30, \ 2914 "Half-life time of invocation counters (in seconds)") \ 2915 \ 2916 develop(intx, CounterDecayMinIntervalLength, 500, \ 2917 "The minimum interval (in milliseconds) between invocation of " \ 2918 "CounterDecay") \ 2919 \ 2920 product(bool, AlwaysCompileLoopMethods, false, \ 2921 "When using recompilation, never interpret methods " \ 2922 "containing loops") \ 2923 \ 2924 product(bool, DontCompileHugeMethods, true, \ 2925 "Do not compile methods > HugeMethodLimit") \ 2926 \ 2927 /* Bytecode escape analysis estimation. */ \ 2928 product(bool, EstimateArgEscape, true, \ 2929 "Analyze bytecodes to estimate escape state of arguments") \ 2930 \ 2931 product(intx, BCEATraceLevel, 0, \ 2932 "How much tracing to do of bytecode escape analysis estimates") \ 2933 \ 2934 product(intx, MaxBCEAEstimateLevel, 5, \ 2935 "Maximum number of nested calls that are analyzed by BC EA") \ 2936 \ 2937 product(intx, MaxBCEAEstimateSize, 150, \ 2938 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2939 \ 2940 product(intx, AllocatePrefetchStyle, 1, \ 2941 "0 = no prefetch, " \ 2942 "1 = prefetch instructions for each allocation, " \ 2943 "2 = use TLAB watermark to gate allocation prefetch, " \ 2944 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2945 \ 2946 product(intx, AllocatePrefetchDistance, -1, \ 2947 "Distance to prefetch ahead of allocation pointer") \ 2948 \ 2949 product(intx, AllocatePrefetchLines, 3, \ 2950 "Number of lines to prefetch ahead of array allocation pointer") \ 2951 \ 2952 product(intx, AllocateInstancePrefetchLines, 1, \ 2953 "Number of lines to prefetch ahead of instance allocation " \ 2954 "pointer") \ 2955 \ 2956 product(intx, AllocatePrefetchStepSize, 16, \ 2957 "Step size in bytes of sequential prefetch instructions") \ 2958 \ 2959 product(intx, AllocatePrefetchInstr, 0, \ 2960 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2961 \ 2962 /* deoptimization */ \ 2963 develop(bool, TraceDeoptimization, false, \ 2964 "Trace deoptimization") \ 2965 \ 2966 develop(bool, DebugDeoptimization, false, \ 2967 "Tracing various information while debugging deoptimization") \ 2968 \ 2969 product(intx, SelfDestructTimer, 0, \ 2970 "Will cause VM to terminate after a given time (in minutes) " \ 2971 "(0 means off)") \ 2972 \ 2973 product(intx, MaxJavaStackTraceDepth, 1024, \ 2974 "The maximum number of lines in the stack trace for Java " \ 2975 "exceptions (0 means all)") \ 2976 \ 2977 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2978 "Guarantee a safepoint (at least) every so many milliseconds " \ 2979 "(0 means none)")) \ 2980 \ 2981 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2982 "Guarantee a safepoint (at least) every so many milliseconds " \ 2983 "(0 means none)")) \ 2984 \ 2985 product(intx, SafepointTimeoutDelay, 10000, \ 2986 "Delay in milliseconds for option SafepointTimeout") \ 2987 \ 2988 product(intx, NmethodSweepFraction, 16, \ 2989 "Number of invocations of sweeper to cover all nmethods") \ 2990 \ 2991 product(intx, NmethodSweepCheckInterval, 5, \ 2992 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2993 \ 2994 product(intx, NmethodSweepActivity, 10, \ 2995 "Removes cold nmethods from code cache if > 0. Higher values " \ 2996 "result in more aggressive sweeping") \ 2997 \ 2998 notproduct(bool, LogSweeper, false, \ 2999 "Keep a ring buffer of sweeper activity") \ 3000 \ 3001 notproduct(intx, SweeperLogEntries, 1024, \ 3002 "Number of records in the ring buffer of sweeper activity") \ 3003 \ 3004 notproduct(intx, MemProfilingInterval, 500, \ 3005 "Time between each invocation of the MemProfiler") \ 3006 \ 3007 develop(intx, MallocCatchPtr, -1, \ 3008 "Hit breakpoint when mallocing/freeing this pointer") \ 3009 \ 3010 notproduct(intx, AssertRepeat, 1, \ 3011 "number of times to evaluate expression in assert " \ 3012 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3013 \ 3014 notproduct(ccstrlist, SuppressErrorAt, "", \ 3015 "List of assertions (file:line) to muzzle") \ 3016 \ 3017 notproduct(uintx, HandleAllocationLimit, 1024, \ 3018 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3019 "is used") \ 3020 \ 3021 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3022 "Threshold for total handle allocation when " \ 3023 "+TraceHandleAllocation is used") \ 3024 \ 3025 develop(intx, StackPrintLimit, 100, \ 3026 "number of stack frames to print in VM-level stack dump") \ 3027 \ 3028 notproduct(intx, MaxElementPrintSize, 256, \ 3029 "maximum number of elements to print") \ 3030 \ 3031 notproduct(intx, MaxSubklassPrintSize, 4, \ 3032 "maximum number of subklasses to print when printing klass") \ 3033 \ 3034 product(intx, MaxInlineLevel, 9, \ 3035 "maximum number of nested calls that are inlined") \ 3036 \ 3037 product(intx, MaxRecursiveInlineLevel, 1, \ 3038 "maximum number of nested recursive calls that are inlined") \ 3039 \ 3040 develop(intx, MaxForceInlineLevel, 100, \ 3041 "maximum number of nested calls that are forced for inlining " \ 3042 "(using CompilerOracle or marked w/ @ForceInline)") \ 3043 \ 3044 product_pd(intx, InlineSmallCode, \ 3045 "Only inline already compiled methods if their code size is " \ 3046 "less than this") \ 3047 \ 3048 product(intx, MaxInlineSize, 35, \ 3049 "The maximum bytecode size of a method to be inlined") \ 3050 \ 3051 product_pd(intx, FreqInlineSize, \ 3052 "The maximum bytecode size of a frequent method to be inlined") \ 3053 \ 3054 product(intx, MaxTrivialSize, 6, \ 3055 "The maximum bytecode size of a trivial method to be inlined") \ 3056 \ 3057 product(intx, MinInliningThreshold, 250, \ 3058 "The minimum invocation count a method needs to have to be " \ 3059 "inlined") \ 3060 \ 3061 develop(intx, MethodHistogramCutoff, 100, \ 3062 "The cutoff value for method invocation histogram (+CountCalls)") \ 3063 \ 3064 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3065 "Number of interpreted methods to show in profile") \ 3066 \ 3067 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3068 "Number of compiled methods to show in profile") \ 3069 \ 3070 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3071 "Number of stub methods to show in profile") \ 3072 \ 3073 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3074 "Number of runtime stub nodes to show in profile") \ 3075 \ 3076 product(intx, ProfileIntervalsTicks, 100, \ 3077 "Number of ticks between printing of interval profile " \ 3078 "(+ProfileIntervals)") \ 3079 \ 3080 notproduct(intx, ScavengeALotInterval, 1, \ 3081 "Interval between which scavenge will occur with +ScavengeALot") \ 3082 \ 3083 notproduct(intx, FullGCALotInterval, 1, \ 3084 "Interval between which full gc will occur with +FullGCALot") \ 3085 \ 3086 notproduct(intx, FullGCALotStart, 0, \ 3087 "For which invocation to start FullGCAlot") \ 3088 \ 3089 notproduct(intx, FullGCALotDummies, 32*K, \ 3090 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3091 "to move") \ 3092 \ 3093 develop(intx, DontYieldALotInterval, 10, \ 3094 "Interval between which yields will be dropped (milliseconds)") \ 3095 \ 3096 develop(intx, MinSleepInterval, 1, \ 3097 "Minimum sleep() interval (milliseconds) when " \ 3098 "ConvertSleepToYield is off (used for Solaris)") \ 3099 \ 3100 develop(intx, ProfilerPCTickThreshold, 15, \ 3101 "Number of ticks in a PC buckets to be a hotspot") \ 3102 \ 3103 notproduct(intx, DeoptimizeALotInterval, 5, \ 3104 "Number of exits until DeoptimizeALot kicks in") \ 3105 \ 3106 notproduct(intx, ZombieALotInterval, 5, \ 3107 "Number of exits until ZombieALot kicks in") \ 3108 \ 3109 diagnostic(intx, MallocVerifyInterval, 0, \ 3110 "If non-zero, verify C heap after every N calls to " \ 3111 "malloc/realloc/free") \ 3112 \ 3113 diagnostic(intx, MallocVerifyStart, 0, \ 3114 "If non-zero, start verifying C heap after Nth call to " \ 3115 "malloc/realloc/free") \ 3116 \ 3117 diagnostic(uintx, MallocMaxTestWords, 0, \ 3118 "If non-zero, maximum number of words that malloc/realloc can " \ 3119 "allocate (for testing only)") \ 3120 \ 3121 product(intx, TypeProfileWidth, 2, \ 3122 "Number of receiver types to record in call/cast profile") \ 3123 \ 3124 develop(intx, BciProfileWidth, 2, \ 3125 "Number of return bci's to record in ret profile") \ 3126 \ 3127 product(intx, PerMethodRecompilationCutoff, 400, \ 3128 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3129 \ 3130 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3131 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3132 \ 3133 product(intx, PerMethodTrapLimit, 100, \ 3134 "Limit on traps (of one kind) in a method (includes inlines)") \ 3135 \ 3136 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3137 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3138 \ 3139 product(intx, PerBytecodeTrapLimit, 4, \ 3140 "Limit on traps (of one kind) at a particular BCI") \ 3141 \ 3142 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3143 "Extra method data trap entries for speculation") \ 3144 \ 3145 develop(intx, InlineFrequencyRatio, 20, \ 3146 "Ratio of call site execution to caller method invocation") \ 3147 \ 3148 develop_pd(intx, InlineFrequencyCount, \ 3149 "Count of call site execution necessary to trigger frequent " \ 3150 "inlining") \ 3151 \ 3152 develop(intx, InlineThrowCount, 50, \ 3153 "Force inlining of interpreted methods that throw this often") \ 3154 \ 3155 develop(intx, InlineThrowMaxSize, 200, \ 3156 "Force inlining of throwing methods smaller than this") \ 3157 \ 3158 develop(intx, ProfilerNodeSize, 1024, \ 3159 "Size in K to allocate for the Profile Nodes of each thread") \ 3160 \ 3161 product_pd(intx, PreInflateSpin, \ 3162 "Number of times to spin wait before inflation") \ 3163 \ 3164 /* gc parameters */ \ 3165 product(uintx, InitialHeapSize, 0, \ 3166 "Initial heap size (in bytes); zero means use ergonomics") \ 3167 \ 3168 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3169 "Maximum heap size (in bytes)") \ 3170 \ 3171 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3172 "Initial tenured generation size (in bytes)") \ 3173 \ 3174 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3175 "Initial new generation size (in bytes)") \ 3176 \ 3177 product(uintx, MaxNewSize, max_uintx, \ 3178 "Maximum new generation size (in bytes), max_uintx means set " \ 3179 "ergonomically") \ 3180 \ 3181 product(uintx, PretenureSizeThreshold, 0, \ 3182 "Maximum size in bytes of objects allocated in DefNew " \ 3183 "generation; zero means no maximum") \ 3184 \ 3185 product(uintx, TLABSize, 0, \ 3186 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3187 \ 3188 product(uintx, MinTLABSize, 2*K, \ 3189 "Minimum allowed TLAB size (in bytes)") \ 3190 \ 3191 product(uintx, TLABAllocationWeight, 35, \ 3192 "Allocation averaging weight") \ 3193 \ 3194 product(uintx, TLABWasteTargetPercent, 1, \ 3195 "Percentage of Eden that can be wasted") \ 3196 \ 3197 product(uintx, TLABRefillWasteFraction, 64, \ 3198 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3199 \ 3200 product(uintx, TLABWasteIncrement, 4, \ 3201 "Increment allowed waste at slow allocation") \ 3202 \ 3203 product(uintx, SurvivorRatio, 8, \ 3204 "Ratio of eden/survivor space size") \ 3205 \ 3206 product(uintx, NewRatio, 2, \ 3207 "Ratio of old/new generation sizes") \ 3208 \ 3209 product_pd(uintx, NewSizeThreadIncrease, \ 3210 "Additional size added to desired new generation size per " \ 3211 "non-daemon thread (in bytes)") \ 3212 \ 3213 product_pd(uintx, MetaspaceSize, \ 3214 "Initial size of Metaspaces (in bytes)") \ 3215 \ 3216 product(uintx, MaxMetaspaceSize, max_uintx, \ 3217 "Maximum size of Metaspaces (in bytes)") \ 3218 \ 3219 product(uintx, CompressedClassSpaceSize, 1*G, \ 3220 "Maximum size of class area in Metaspace when compressed " \ 3221 "class pointers are used") \ 3222 \ 3223 manageable(uintx, MinHeapFreeRatio, 40, \ 3224 "The minimum percentage of heap free after GC to avoid expansion."\ 3225 " For most GCs this applies to the old generation. In G1 and" \ 3226 " ParallelGC it applies to the whole heap.") \ 3227 \ 3228 manageable(uintx, MaxHeapFreeRatio, 70, \ 3229 "The maximum percentage of heap free after GC to avoid shrinking."\ 3230 " For most GCs this applies to the old generation. In G1 and" \ 3231 " ParallelGC it applies to the whole heap.") \ 3232 \ 3233 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3234 "Number of milliseconds per MB of free space in the heap") \ 3235 \ 3236 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3237 "The minimum change in heap space due to GC (in bytes)") \ 3238 \ 3239 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3240 "The minimum expansion of Metaspace (in bytes)") \ 3241 \ 3242 product(uintx, MinMetaspaceFreeRatio, 40, \ 3243 "The minimum percentage of Metaspace free after GC to avoid " \ 3244 "expansion") \ 3245 \ 3246 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3247 "The maximum percentage of Metaspace free after GC to avoid " \ 3248 "shrinking") \ 3249 \ 3250 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3251 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3252 \ 3253 product(uintx, QueuedAllocationWarningCount, 0, \ 3254 "Number of times an allocation that queues behind a GC " \ 3255 "will retry before printing a warning") \ 3256 \ 3257 diagnostic(uintx, VerifyGCStartAt, 0, \ 3258 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3259 \ 3260 diagnostic(intx, VerifyGCLevel, 0, \ 3261 "Generation level at which to start +VerifyBefore/AfterGC") \ 3262 \ 3263 product(uintx, MaxTenuringThreshold, 15, \ 3264 "Maximum value for tenuring threshold") \ 3265 \ 3266 product(uintx, InitialTenuringThreshold, 7, \ 3267 "Initial value for tenuring threshold") \ 3268 \ 3269 product(uintx, TargetSurvivorRatio, 50, \ 3270 "Desired percentage of survivor space used after scavenge") \ 3271 \ 3272 product(uintx, MarkSweepDeadRatio, 5, \ 3273 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3274 "Serial mark sweep treats this as both the minimum and maximum " \ 3275 "value. " \ 3276 "CMS uses this value only if it falls back to mark sweep. " \ 3277 "Par compact uses a variable scale based on the density of the " \ 3278 "generation and treats this as the maximum value when the heap " \ 3279 "is either completely full or completely empty. Par compact " \ 3280 "also has a smaller default value; see arguments.cpp.") \ 3281 \ 3282 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3283 "How often should we fully compact the heap (ignoring the dead " \ 3284 "space parameters)") \ 3285 \ 3286 product(intx, PrintCMSStatistics, 0, \ 3287 "Statistics for CMS") \ 3288 \ 3289 product(bool, PrintCMSInitiationStatistics, false, \ 3290 "Statistics for initiating a CMS collection") \ 3291 \ 3292 product(intx, PrintFLSStatistics, 0, \ 3293 "Statistics for CMS' FreeListSpace") \ 3294 \ 3295 product(intx, PrintFLSCensus, 0, \ 3296 "Census for CMS' FreeListSpace") \ 3297 \ 3298 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3299 "Delay between expansion and allocation (in milliseconds)") \ 3300 \ 3301 develop(uintx, GCWorkerDelayMillis, 0, \ 3302 "Delay in scheduling GC workers (in milliseconds)") \ 3303 \ 3304 product(intx, DeferThrSuspendLoopCount, 4000, \ 3305 "(Unstable) Number of times to iterate in safepoint loop " \ 3306 "before blocking VM threads ") \ 3307 \ 3308 product(intx, DeferPollingPageLoopCount, -1, \ 3309 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3310 "before changing safepoint polling page to RO ") \ 3311 \ 3312 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3313 \ 3314 product(bool, PSChunkLargeArrays, true, \ 3315 "Process large arrays in chunks") \ 3316 \ 3317 product(uintx, GCDrainStackTargetSize, 64, \ 3318 "Number of entries we will try to leave on the stack " \ 3319 "during parallel gc") \ 3320 \ 3321 /* stack parameters */ \ 3322 product_pd(intx, StackYellowPages, \ 3323 "Number of yellow zone (recoverable overflows) pages") \ 3324 \ 3325 product_pd(intx, StackRedPages, \ 3326 "Number of red zone (unrecoverable overflows) pages") \ 3327 \ 3328 product_pd(intx, StackShadowPages, \ 3329 "Number of shadow zone (for overflow checking) pages " \ 3330 "this should exceed the depth of the VM and native call stack") \ 3331 \ 3332 product_pd(intx, ThreadStackSize, \ 3333 "Thread Stack Size (in Kbytes)") \ 3334 \ 3335 product_pd(intx, VMThreadStackSize, \ 3336 "Non-Java Thread Stack Size (in Kbytes)") \ 3337 \ 3338 product_pd(intx, CompilerThreadStackSize, \ 3339 "Compiler Thread Stack Size (in Kbytes)") \ 3340 \ 3341 develop_pd(uintx, JVMInvokeMethodSlack, \ 3342 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3343 \ 3344 product(uintx, ThreadSafetyMargin, 50*M, \ 3345 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3346 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3347 "disable this feature") \ 3348 \ 3349 /* code cache parameters */ \ 3350 /* ppc64 has large code-entry alignment. */ \ 3351 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \ 3352 "Code cache segment size (in bytes) - smallest unit of " \ 3353 "allocation") \ 3354 \ 3355 develop_pd(intx, CodeEntryAlignment, \ 3356 "Code entry alignment for generated code (in bytes)") \ 3357 \ 3358 product_pd(intx, OptoLoopAlignment, \ 3359 "Align inner loops to zero relative to this modulus") \ 3360 \ 3361 product_pd(uintx, InitialCodeCacheSize, \ 3362 "Initial code cache size (in bytes)") \ 3363 \ 3364 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3365 "Minimum code cache size (in bytes) required to start VM.") \ 3366 \ 3367 product_pd(uintx, ReservedCodeCacheSize, \ 3368 "Reserved code cache size (in bytes) - maximum code cache size") \ 3369 \ 3370 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3371 "When less than X space left, we stop compiling") \ 3372 \ 3373 product_pd(uintx, CodeCacheExpansionSize, \ 3374 "Code cache expansion size (in bytes)") \ 3375 \ 3376 develop_pd(uintx, CodeCacheMinBlockLength, \ 3377 "Minimum number of segments in a code cache block") \ 3378 \ 3379 notproduct(bool, ExitOnFullCodeCache, false, \ 3380 "Exit the VM if we fill the code cache") \ 3381 \ 3382 product(bool, UseCodeCacheFlushing, true, \ 3383 "Remove cold/old nmethods from the code cache") \ 3384 \ 3385 /* interpreter debugging */ \ 3386 develop(intx, BinarySwitchThreshold, 5, \ 3387 "Minimal number of lookupswitch entries for rewriting to binary " \ 3388 "switch") \ 3389 \ 3390 develop(intx, StopInterpreterAt, 0, \ 3391 "Stop interpreter execution at specified bytecode number") \ 3392 \ 3393 develop(intx, TraceBytecodesAt, 0, \ 3394 "Trace bytecodes starting with specified bytecode number") \ 3395 \ 3396 /* compiler interface */ \ 3397 develop(intx, CIStart, 0, \ 3398 "The id of the first compilation to permit") \ 3399 \ 3400 develop(intx, CIStop, max_jint, \ 3401 "The id of the last compilation to permit") \ 3402 \ 3403 develop(intx, CIStartOSR, 0, \ 3404 "The id of the first osr compilation to permit " \ 3405 "(CICountOSR must be on)") \ 3406 \ 3407 develop(intx, CIStopOSR, max_jint, \ 3408 "The id of the last osr compilation to permit " \ 3409 "(CICountOSR must be on)") \ 3410 \ 3411 develop(intx, CIBreakAtOSR, -1, \ 3412 "The id of osr compilation to break at") \ 3413 \ 3414 develop(intx, CIBreakAt, -1, \ 3415 "The id of compilation to break at") \ 3416 \ 3417 product(ccstrlist, CompileOnly, "", \ 3418 "List of methods (pkg/class.name) to restrict compilation to") \ 3419 \ 3420 product(ccstr, CompileCommandFile, NULL, \ 3421 "Read compiler commands from this file [.hotspot_compiler]") \ 3422 \ 3423 product(ccstrlist, CompileCommand, "", \ 3424 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3425 \ 3426 develop(bool, ReplayCompiles, false, \ 3427 "Enable replay of compilations from ReplayDataFile") \ 3428 \ 3429 product(ccstr, ReplayDataFile, NULL, \ 3430 "File containing compilation replay information" \ 3431 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3432 \ 3433 product(ccstr, InlineDataFile, NULL, \ 3434 "File containing inlining replay information" \ 3435 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3436 \ 3437 develop(intx, ReplaySuppressInitializers, 2, \ 3438 "Control handling of class initialization during replay: " \ 3439 "0 - don't do anything special; " \ 3440 "1 - treat all class initializers as empty; " \ 3441 "2 - treat class initializers for application classes as empty; " \ 3442 "3 - allow all class initializers to run during bootstrap but " \ 3443 " pretend they are empty after starting replay") \ 3444 \ 3445 develop(bool, ReplayIgnoreInitErrors, false, \ 3446 "Ignore exceptions thrown during initialization for replay") \ 3447 \ 3448 product(bool, DumpReplayDataOnError, true, \ 3449 "Record replay data for crashing compiler threads") \ 3450 \ 3451 product(bool, CICompilerCountPerCPU, false, \ 3452 "1 compiler thread for log(N CPUs)") \ 3453 \ 3454 develop(intx, CIFireOOMAt, -1, \ 3455 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3456 "(non-negative value throws OOM after this many CI accesses " \ 3457 "in each compile)") \ 3458 notproduct(intx, CICrashAt, -1, \ 3459 "id of compilation to trigger assert in compiler thread for " \ 3460 "the purpose of testing, e.g. generation of replay data") \ 3461 notproduct(bool, CIObjectFactoryVerify, false, \ 3462 "enable potentially expensive verification in ciObjectFactory") \ 3463 \ 3464 /* Priorities */ \ 3465 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3466 \ 3467 product(intx, ThreadPriorityPolicy, 0, \ 3468 "0 : Normal. "\ 3469 " VM chooses priorities that are appropriate for normal "\ 3470 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3471 " to normal native priority. Java priorities below " \ 3472 " NORM_PRIORITY map to lower native priority values. On "\ 3473 " Windows applications are allowed to use higher native "\ 3474 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3475 " not use the highest possible native priority, "\ 3476 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3477 " system threads. On Linux thread priorities are ignored "\ 3478 " because the OS does not support static priority in "\ 3479 " SCHED_OTHER scheduling class which is the only choice for "\ 3480 " non-root, non-realtime applications. "\ 3481 "1 : Aggressive. "\ 3482 " Java thread priorities map over to the entire range of "\ 3483 " native thread priorities. Higher Java thread priorities map "\ 3484 " to higher native thread priorities. This policy should be "\ 3485 " used with care, as sometimes it can cause performance "\ 3486 " degradation in the application and/or the entire system. On "\ 3487 " Linux this policy requires root privilege.") \ 3488 \ 3489 product(bool, ThreadPriorityVerbose, false, \ 3490 "Print priority changes") \ 3491 \ 3492 product(intx, DefaultThreadPriority, -1, \ 3493 "The native priority at which threads run if not elsewhere " \ 3494 "specified (-1 means no change)") \ 3495 \ 3496 product(intx, CompilerThreadPriority, -1, \ 3497 "The native priority at which compiler threads should run " \ 3498 "(-1 means no change)") \ 3499 \ 3500 product(intx, VMThreadPriority, -1, \ 3501 "The native priority at which the VM thread should run " \ 3502 "(-1 means no change)") \ 3503 \ 3504 product(bool, CompilerThreadHintNoPreempt, true, \ 3505 "(Solaris only) Give compiler threads an extra quanta") \ 3506 \ 3507 product(bool, VMThreadHintNoPreempt, false, \ 3508 "(Solaris only) Give VM thread an extra quanta") \ 3509 \ 3510 product(intx, JavaPriority1_To_OSPriority, -1, \ 3511 "Map Java priorities to OS priorities") \ 3512 \ 3513 product(intx, JavaPriority2_To_OSPriority, -1, \ 3514 "Map Java priorities to OS priorities") \ 3515 \ 3516 product(intx, JavaPriority3_To_OSPriority, -1, \ 3517 "Map Java priorities to OS priorities") \ 3518 \ 3519 product(intx, JavaPriority4_To_OSPriority, -1, \ 3520 "Map Java priorities to OS priorities") \ 3521 \ 3522 product(intx, JavaPriority5_To_OSPriority, -1, \ 3523 "Map Java priorities to OS priorities") \ 3524 \ 3525 product(intx, JavaPriority6_To_OSPriority, -1, \ 3526 "Map Java priorities to OS priorities") \ 3527 \ 3528 product(intx, JavaPriority7_To_OSPriority, -1, \ 3529 "Map Java priorities to OS priorities") \ 3530 \ 3531 product(intx, JavaPriority8_To_OSPriority, -1, \ 3532 "Map Java priorities to OS priorities") \ 3533 \ 3534 product(intx, JavaPriority9_To_OSPriority, -1, \ 3535 "Map Java priorities to OS priorities") \ 3536 \ 3537 product(intx, JavaPriority10_To_OSPriority,-1, \ 3538 "Map Java priorities to OS priorities") \ 3539 \ 3540 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3541 "Java thread priority 10 maps to critical scheduling priority") \ 3542 \ 3543 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3544 "Compiler thread(s) run at critical scheduling priority") \ 3545 \ 3546 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3547 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3548 \ 3549 /* compiler debugging */ \ 3550 notproduct(intx, CompileTheWorldStartAt, 1, \ 3551 "First class to consider when using +CompileTheWorld") \ 3552 \ 3553 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3554 "Last class to consider when using +CompileTheWorld") \ 3555 \ 3556 develop(intx, NewCodeParameter, 0, \ 3557 "Testing Only: Create a dedicated integer parameter before " \ 3558 "putback") \ 3559 \ 3560 /* new oopmap storage allocation */ \ 3561 develop(intx, MinOopMapAllocation, 8, \ 3562 "Minimum number of OopMap entries in an OopMapSet") \ 3563 \ 3564 /* Background Compilation */ \ 3565 develop(intx, LongCompileThreshold, 50, \ 3566 "Used with +TraceLongCompiles") \ 3567 \ 3568 product(intx, StarvationMonitorInterval, 200, \ 3569 "Pause between each check (in milliseconds)") \ 3570 \ 3571 /* recompilation */ \ 3572 product_pd(intx, CompileThreshold, \ 3573 "number of interpreted method invocations before (re-)compiling") \ 3574 \ 3575 product_pd(intx, BackEdgeThreshold, \ 3576 "Interpreter Back edge threshold at which an OSR compilation is " \ 3577 "invoked") \ 3578 \ 3579 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3580 "Interpreter (tier 0) invocation notification frequency") \ 3581 \ 3582 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3583 "C1 without MDO (tier 2) invocation notification frequency") \ 3584 \ 3585 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3586 "C1 with MDO profiling (tier 3) invocation notification " \ 3587 "frequency") \ 3588 \ 3589 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3590 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3591 \ 3592 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3593 "Interpreter (tier 0) invocation notification frequency") \ 3594 \ 3595 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3596 "C1 without MDO (tier 2) invocation notification frequency") \ 3597 \ 3598 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3599 "C1 with MDO profiling (tier 3) invocation notification " \ 3600 "frequency") \ 3601 \ 3602 product(intx, Tier2CompileThreshold, 0, \ 3603 "threshold at which tier 2 compilation is invoked") \ 3604 \ 3605 product(intx, Tier2BackEdgeThreshold, 0, \ 3606 "Back edge threshold at which tier 2 compilation is invoked") \ 3607 \ 3608 product(intx, Tier3InvocationThreshold, 200, \ 3609 "Compile if number of method invocations crosses this " \ 3610 "threshold") \ 3611 \ 3612 product(intx, Tier3MinInvocationThreshold, 100, \ 3613 "Minimum invocation to compile at tier 3") \ 3614 \ 3615 product(intx, Tier3CompileThreshold, 2000, \ 3616 "Threshold at which tier 3 compilation is invoked (invocation " \ 3617 "minimum must be satisfied") \ 3618 \ 3619 product(intx, Tier3BackEdgeThreshold, 60000, \ 3620 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3621 \ 3622 product(intx, Tier4InvocationThreshold, 5000, \ 3623 "Compile if number of method invocations crosses this " \ 3624 "threshold") \ 3625 \ 3626 product(intx, Tier4MinInvocationThreshold, 600, \ 3627 "Minimum invocation to compile at tier 4") \ 3628 \ 3629 product(intx, Tier4CompileThreshold, 15000, \ 3630 "Threshold at which tier 4 compilation is invoked (invocation " \ 3631 "minimum must be satisfied") \ 3632 \ 3633 product(intx, Tier4BackEdgeThreshold, 40000, \ 3634 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3635 \ 3636 product(intx, Tier3DelayOn, 5, \ 3637 "If C2 queue size grows over this amount per compiler thread " \ 3638 "stop compiling at tier 3 and start compiling at tier 2") \ 3639 \ 3640 product(intx, Tier3DelayOff, 2, \ 3641 "If C2 queue size is less than this amount per compiler thread " \ 3642 "allow methods compiled at tier 2 transition to tier 3") \ 3643 \ 3644 product(intx, Tier3LoadFeedback, 5, \ 3645 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3646 "reaches this amount per compiler thread") \ 3647 \ 3648 product(intx, Tier4LoadFeedback, 3, \ 3649 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3650 "reaches this amount per compiler thread") \ 3651 \ 3652 product(intx, TieredCompileTaskTimeout, 50, \ 3653 "Kill compile task if method was not used within " \ 3654 "given timeout in milliseconds") \ 3655 \ 3656 product(intx, TieredStopAtLevel, 4, \ 3657 "Stop at given compilation level") \ 3658 \ 3659 product(intx, Tier0ProfilingStartPercentage, 200, \ 3660 "Start profiling in interpreter if the counters exceed tier 3 " \ 3661 "thresholds by the specified percentage") \ 3662 \ 3663 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3664 "Increase the compile threshold for C1 compilation if the code " \ 3665 "cache is filled by the specified percentage") \ 3666 \ 3667 product(intx, TieredRateUpdateMinTime, 1, \ 3668 "Minimum rate sampling interval (in milliseconds)") \ 3669 \ 3670 product(intx, TieredRateUpdateMaxTime, 25, \ 3671 "Maximum rate sampling interval (in milliseconds)") \ 3672 \ 3673 product_pd(bool, TieredCompilation, \ 3674 "Enable tiered compilation") \ 3675 \ 3676 product(bool, PrintTieredEvents, false, \ 3677 "Print tiered events notifications") \ 3678 \ 3679 product_pd(intx, OnStackReplacePercentage, \ 3680 "NON_TIERED number of method invocations/branches (expressed as " \ 3681 "% of CompileThreshold) before (re-)compiling OSR code") \ 3682 \ 3683 product(intx, InterpreterProfilePercentage, 33, \ 3684 "NON_TIERED number of method invocations/branches (expressed as " \ 3685 "% of CompileThreshold) before profiling in the interpreter") \ 3686 \ 3687 develop(intx, MaxRecompilationSearchLength, 10, \ 3688 "The maximum number of frames to inspect when searching for " \ 3689 "recompilee") \ 3690 \ 3691 develop(intx, MaxInterpretedSearchLength, 3, \ 3692 "The maximum number of interpreted frames to skip when searching "\ 3693 "for recompilee") \ 3694 \ 3695 develop(intx, DesiredMethodLimit, 8000, \ 3696 "The desired maximum method size (in bytecodes) after inlining") \ 3697 \ 3698 develop(intx, HugeMethodLimit, 8000, \ 3699 "Don't compile methods larger than this if " \ 3700 "+DontCompileHugeMethods") \ 3701 \ 3702 /* New JDK 1.4 reflection implementation */ \ 3703 \ 3704 develop(bool, UseNewReflection, true, \ 3705 "Temporary flag for transition to reflection based on dynamic " \ 3706 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3707 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3708 "changes were needed") \ 3709 \ 3710 develop(bool, VerifyReflectionBytecodes, false, \ 3711 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3712 "in situations like that described in 4486457 or for " \ 3713 "constructors generated for serialization, so can not be enabled "\ 3714 "in product.") \ 3715 \ 3716 product(bool, ReflectionWrapResolutionErrors, true, \ 3717 "Temporary flag for transition to AbstractMethodError wrapped " \ 3718 "in InvocationTargetException. See 6531596") \ 3719 \ 3720 develop(intx, FastSuperclassLimit, 8, \ 3721 "Depth of hardwired instanceof accelerator array") \ 3722 \ 3723 /* Properties for Java libraries */ \ 3724 \ 3725 product(uintx, MaxDirectMemorySize, 0, \ 3726 "Maximum total size of NIO direct-buffer allocations") \ 3727 \ 3728 /* temporary developer defined flags */ \ 3729 \ 3730 diagnostic(bool, UseNewCode, false, \ 3731 "Testing Only: Use the new version while testing") \ 3732 \ 3733 diagnostic(bool, UseNewCode2, false, \ 3734 "Testing Only: Use the new version while testing") \ 3735 \ 3736 diagnostic(bool, UseNewCode3, false, \ 3737 "Testing Only: Use the new version while testing") \ 3738 \ 3739 /* flags for performance data collection */ \ 3740 \ 3741 product(bool, UsePerfData, falseInEmbedded, \ 3742 "Flag to disable jvmstat instrumentation for performance testing "\ 3743 "and problem isolation purposes") \ 3744 \ 3745 product(bool, PerfDataSaveToFile, false, \ 3746 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3747 \ 3748 product(ccstr, PerfDataSaveFile, NULL, \ 3749 "Save PerfData memory to the specified absolute pathname. " \ 3750 "The string %p in the file name (if present) " \ 3751 "will be replaced by pid") \ 3752 \ 3753 product(intx, PerfDataSamplingInterval, 50, \ 3754 "Data sampling interval (in milliseconds)") \ 3755 \ 3756 develop(bool, PerfTraceDataCreation, false, \ 3757 "Trace creation of Performance Data Entries") \ 3758 \ 3759 develop(bool, PerfTraceMemOps, false, \ 3760 "Trace PerfMemory create/attach/detach calls") \ 3761 \ 3762 product(bool, PerfDisableSharedMem, false, \ 3763 "Store performance data in standard memory") \ 3764 \ 3765 product(intx, PerfDataMemorySize, 32*K, \ 3766 "Size of performance data memory region. Will be rounded " \ 3767 "up to a multiple of the native os page size.") \ 3768 \ 3769 product(intx, PerfMaxStringConstLength, 1024, \ 3770 "Maximum PerfStringConstant string length before truncation") \ 3771 \ 3772 product(bool, PerfAllowAtExitRegistration, false, \ 3773 "Allow registration of atexit() methods") \ 3774 \ 3775 product(bool, PerfBypassFileSystemCheck, false, \ 3776 "Bypass Win32 file system criteria checks (Windows Only)") \ 3777 \ 3778 product(intx, UnguardOnExecutionViolation, 0, \ 3779 "Unguard page and retry on no-execute fault (Win32 only) " \ 3780 "0=off, 1=conservative, 2=aggressive") \ 3781 \ 3782 /* Serviceability Support */ \ 3783 \ 3784 product(bool, ManagementServer, false, \ 3785 "Create JMX Management Server") \ 3786 \ 3787 product(bool, DisableAttachMechanism, false, \ 3788 "Disable mechanism that allows tools to attach to this VM") \ 3789 \ 3790 product(bool, StartAttachListener, false, \ 3791 "Always start Attach Listener at VM startup") \ 3792 \ 3793 manageable(bool, PrintConcurrentLocks, false, \ 3794 "Print java.util.concurrent locks in thread dump") \ 3795 \ 3796 product(bool, TransmitErrorReport, false, \ 3797 "Enable error report transmission on erroneous termination") \ 3798 \ 3799 product(ccstr, ErrorReportServer, NULL, \ 3800 "Override built-in error report server address") \ 3801 \ 3802 /* Shared spaces */ \ 3803 \ 3804 product(bool, UseSharedSpaces, true, \ 3805 "Use shared spaces for metadata") \ 3806 \ 3807 product(bool, VerifySharedSpaces, false, \ 3808 "Verify shared spaces (false for default archive, true for " \ 3809 "archive specified by -XX:SharedArchiveFile)") \ 3810 \ 3811 product(bool, RequireSharedSpaces, false, \ 3812 "Require shared spaces for metadata") \ 3813 \ 3814 product(bool, DumpSharedSpaces, false, \ 3815 "Special mode: JVM reads a class list, loads classes, builds " \ 3816 "shared spaces, and dumps the shared spaces to a file to be " \ 3817 "used in future JVM runs") \ 3818 \ 3819 product(bool, PrintSharedSpaces, false, \ 3820 "Print usage of shared spaces") \ 3821 \ 3822 product(bool, PrintSharedArchiveAndExit, false, \ 3823 "Print shared archive file contents") \ 3824 \ 3825 product(bool, PrintSharedDictionary, false, \ 3826 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3827 "dictionary") \ 3828 \ 3829 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3830 "Size of read-write space for metadata (in bytes)") \ 3831 \ 3832 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3833 "Size of read-only space for metadata (in bytes)") \ 3834 \ 3835 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3836 "Size of the shared miscellaneous data area (in bytes)") \ 3837 \ 3838 product(uintx, SharedMiscCodeSize, 120*K, \ 3839 "Size of the shared miscellaneous code area (in bytes)") \ 3840 \ 3841 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3842 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3843 "Address to allocate shared memory region for class data") \ 3844 \ 3845 diagnostic(bool, EnableInvokeDynamic, true, \ 3846 "support JSR 292 (method handles, invokedynamic, " \ 3847 "anonymous classes") \ 3848 \ 3849 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3850 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3851 "classes. Just exclude them from the shared dictionary.") \ 3852 \ 3853 diagnostic(bool, PrintMethodHandleStubs, false, \ 3854 "Print generated stub code for method handles") \ 3855 \ 3856 develop(bool, TraceMethodHandles, false, \ 3857 "trace internal method handle operations") \ 3858 \ 3859 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3860 "perform extra checks when constructing method handles") \ 3861 \ 3862 diagnostic(bool, ShowHiddenFrames, false, \ 3863 "show method handle implementation frames (usually hidden)") \ 3864 \ 3865 experimental(bool, TrustFinalNonStaticFields, false, \ 3866 "trust final non-static declarations for constant folding") \ 3867 \ 3868 diagnostic(bool, FoldStableValues, true, \ 3869 "Optimize loads from stable fields (marked w/ @Stable)") \ 3870 \ 3871 develop(bool, TraceInvokeDynamic, false, \ 3872 "trace internal invoke dynamic operations") \ 3873 \ 3874 diagnostic(bool, PauseAtStartup, false, \ 3875 "Causes the VM to pause at startup time and wait for the pause " \ 3876 "file to be removed (default: ./vm.paused.<pid>)") \ 3877 \ 3878 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3879 "The file to create and for whose removal to await when pausing " \ 3880 "at startup. (default: ./vm.paused.<pid>)") \ 3881 \ 3882 diagnostic(bool, PauseAtExit, false, \ 3883 "Pause and wait for keypress on exit if a debugger is attached") \ 3884 \ 3885 product(bool, ExtendedDTraceProbes, false, \ 3886 "Enable performance-impacting dtrace probes") \ 3887 \ 3888 product(bool, DTraceMethodProbes, false, \ 3889 "Enable dtrace probes for method-entry and method-exit") \ 3890 \ 3891 product(bool, DTraceAllocProbes, false, \ 3892 "Enable dtrace probes for object allocation") \ 3893 \ 3894 product(bool, DTraceMonitorProbes, false, \ 3895 "Enable dtrace probes for monitor events") \ 3896 \ 3897 product(bool, RelaxAccessControlCheck, false, \ 3898 "Relax the access control checks in the verifier") \ 3899 \ 3900 diagnostic(bool, PrintDTraceDOF, false, \ 3901 "Print the DTrace DOF passed to the system for JSDT probes") \ 3902 \ 3903 product(uintx, StringTableSize, defaultStringTableSize, \ 3904 "Number of buckets in the interned String table") \ 3905 \ 3906 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3907 "Number of buckets in the JVM internal Symbol table") \ 3908 \ 3909 product(bool, UseStringDeduplication, false, \ 3910 "Use string deduplication") \ 3911 \ 3912 product(bool, PrintStringDeduplicationStatistics, false, \ 3913 "Print string deduplication statistics") \ 3914 \ 3915 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3916 "A string must reach this age (or be promoted to an old region) " \ 3917 "to be considered for deduplication") \ 3918 \ 3919 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3920 "Force table resize every time the table is scanned") \ 3921 \ 3922 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3923 "Force table rehash every time the table is scanned") \ 3924 \ 3925 develop(bool, TraceDefaultMethods, false, \ 3926 "Trace the default method processing steps") \ 3927 \ 3928 develop(bool, VerifyGenericSignatures, false, \ 3929 "Abort VM on erroneous or inconsistent generic signatures") \ 3930 \ 3931 product(bool, UseVMInterruptibleIO, false, \ 3932 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3933 "EINTR for I/O operations results in OS_INTRPT. The default " \ 3934 "value of this flag is true for JDK 6 and earlier") \ 3935 \ 3936 diagnostic(bool, WhiteBoxAPI, false, \ 3937 "Enable internal testing APIs") \ 3938 \ 3939 product(bool, PrintGCCause, true, \ 3940 "Include GC cause in GC logging") \ 3941 \ 3942 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3943 "Default survivor space alignment in bytes") \ 3944 \ 3945 product(bool , AllowNonVirtualCalls, false, \ 3946 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3947 \ 3948 product(ccstr, DumpLoadedClassList, NULL, \ 3949 "Dump the names all loaded classes, that could be stored into " \ 3950 "the CDS archive, in the specified file") \ 3951 \ 3952 product(ccstr, SharedClassListFile, NULL, \ 3953 "Override the default CDS class list") \ 3954 \ 3955 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3956 "Override the default location of the CDS archive file") \ 3957 \ 3958 product(ccstr, ExtraSharedClassListFile, NULL, \ 3959 "Extra classlist for building the CDS archive file") \ 3960 \ 3961 experimental(uintx, ArrayAllocatorMallocLimit, \ 3962 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3963 "Allocation less than this value will be allocated " \ 3964 "using malloc. Larger allocations will use mmap.") \ 3965 \ 3966 product(bool, EnableTracing, false, \ 3967 "Enable event-based tracing") \ 3968 \ 3969 product(bool, UseLockedTracing, false, \ 3970 "Use locked-tracing when doing event-based tracing") \ 3971 \ 3972 product_pd(bool, PreserveFramePointer, \ 3973 "Use the FP register for holding the frame pointer " \ 3974 "and not as a general purpose register.") 3975 3976 /* 3977 * Macros for factoring of globals 3978 */ 3979 3980 // Interface macros 3981 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3982 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3983 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3984 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3985 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3986 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3987 #ifdef PRODUCT 3988 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3989 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3990 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3991 #else 3992 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3993 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3994 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3995 #endif 3996 // Special LP64 flags, product only needed for now. 3997 #ifdef _LP64 3998 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3999 #else 4000 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4001 #endif // _LP64 4002 4003 // Implementation macros 4004 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4005 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4006 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4007 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4008 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4009 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4010 #ifdef PRODUCT 4011 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4012 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4013 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4014 #else 4015 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4016 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4017 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4018 #endif 4019 #ifdef _LP64 4020 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4021 #else 4022 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4023 #endif // _LP64 4024 4025 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) 4026 4027 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4028 4029 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4030 4031 // Extensions 4032 4033 #include "runtime/globals_ext.hpp" 4034 4035 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP