1 /* 2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 30 // use this for flags that are true per default in the tiered build 31 // but false in non-tiered builds, and vice versa 32 #ifdef TIERED 33 #define trueInTiered true 34 #define falseInTiered false 35 #else 36 #define trueInTiered false 37 #define falseInTiered true 38 #endif 39 40 #ifdef TARGET_ARCH_x86 41 # include "globals_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_aarch64 44 # include "globals_aarch64.hpp" 45 #endif 46 #ifdef TARGET_ARCH_sparc 47 # include "globals_sparc.hpp" 48 #endif 49 #ifdef TARGET_ARCH_zero 50 # include "globals_zero.hpp" 51 #endif 52 #ifdef TARGET_ARCH_arm 53 # include "globals_arm.hpp" 54 #endif 55 #ifdef TARGET_ARCH_ppc 56 # include "globals_ppc.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_aarch64 77 # include "globals_linux_aarch64.hpp" 78 #endif 79 #ifdef TARGET_OS_ARCH_linux_sparc 80 # include "globals_linux_sparc.hpp" 81 #endif 82 #ifdef TARGET_OS_ARCH_linux_zero 83 # include "globals_linux_zero.hpp" 84 #endif 85 #ifdef TARGET_OS_ARCH_solaris_x86 86 # include "globals_solaris_x86.hpp" 87 #endif 88 #ifdef TARGET_OS_ARCH_solaris_sparc 89 # include "globals_solaris_sparc.hpp" 90 #endif 91 #ifdef TARGET_OS_ARCH_windows_x86 92 # include "globals_windows_x86.hpp" 93 #endif 94 #ifdef TARGET_OS_ARCH_linux_arm 95 # include "globals_linux_arm.hpp" 96 #endif 97 #ifdef TARGET_OS_ARCH_linux_ppc 98 # include "globals_linux_ppc.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_aarch64 114 # include "c1_globals_aarch64.hpp" 115 #endif 116 #ifdef TARGET_ARCH_sparc 117 # include "c1_globals_sparc.hpp" 118 #endif 119 #ifdef TARGET_ARCH_arm 120 # include "c1_globals_arm.hpp" 121 #endif 122 #ifdef TARGET_ARCH_ppc 123 # include "c1_globals_ppc.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_aarch64 146 # include "c2_globals_aarch64.hpp" 147 #endif 148 #ifdef TARGET_ARCH_sparc 149 # include "c2_globals_sparc.hpp" 150 #endif 151 #ifdef TARGET_ARCH_arm 152 # include "c2_globals_arm.hpp" 153 #endif 154 #ifdef TARGET_ARCH_ppc 155 # include "c2_globals_ppc.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(bool, UseShenandoahGC, false, \ 1427 "Use the Shenandoah garbage collector") \ 1428 \ 1429 product(uintx, HeapMaximumCompactionInterval, 20, \ 1430 "How often should we maximally compact the heap (not allowing " \ 1431 "any dead space)") \ 1432 \ 1433 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1434 "The collection count for the first maximum compaction") \ 1435 \ 1436 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1437 "Use maximum compaction in the Parallel Old garbage collector " \ 1438 "for a system GC") \ 1439 \ 1440 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1441 "The mean used by the parallel compact dead wood " \ 1442 "limiter (a number between 0-100)") \ 1443 \ 1444 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1445 "The standard deviation used by the parallel compact dead wood " \ 1446 "limiter (a number between 0-100)") \ 1447 \ 1448 product(uintx, ParallelGCThreads, 0, \ 1449 "Number of parallel threads parallel gc will use") \ 1450 \ 1451 product(bool, UseDynamicNumberOfGCThreads, false, \ 1452 "Dynamically choose the number of parallel threads " \ 1453 "parallel gc will use") \ 1454 \ 1455 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1456 "Force dynamic selection of the number of " \ 1457 "parallel threads parallel gc will use to aid debugging") \ 1458 \ 1459 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1460 "Size of heap (bytes) per GC thread used in calculating the " \ 1461 "number of GC threads") \ 1462 \ 1463 product(bool, TraceDynamicGCThreads, false, \ 1464 "Trace the dynamic GC thread usage") \ 1465 \ 1466 develop(bool, ParallelOldGCSplitALot, false, \ 1467 "Provoke splitting (copying data from a young gen space to " \ 1468 "multiple destination spaces)") \ 1469 \ 1470 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1471 "How often to provoke splitting a young gen space") \ 1472 \ 1473 product(uintx, ConcGCThreads, 0, \ 1474 "Number of threads concurrent gc will use") \ 1475 \ 1476 product(uintx, YoungPLABSize, 4096, \ 1477 "Size of young gen promotion LAB's (in HeapWords)") \ 1478 \ 1479 product(uintx, OldPLABSize, 1024, \ 1480 "Size of old gen promotion LAB's (in HeapWords)") \ 1481 \ 1482 product(uintx, GCTaskTimeStampEntries, 200, \ 1483 "Number of time stamp entries per gc worker thread") \ 1484 \ 1485 product(bool, AlwaysTenure, false, \ 1486 "Always tenure objects in eden (ParallelGC only)") \ 1487 \ 1488 product(bool, NeverTenure, false, \ 1489 "Never tenure objects in eden, may tenure on overflow " \ 1490 "(ParallelGC only)") \ 1491 \ 1492 product(bool, ScavengeBeforeFullGC, true, \ 1493 "Scavenge youngest generation before each full GC, " \ 1494 "used with UseParallelGC") \ 1495 \ 1496 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1497 "Allow scavenges to occur when to-space contains objects") \ 1498 \ 1499 product(bool, UseConcMarkSweepGC, false, \ 1500 "Use Concurrent Mark-Sweep GC in the old generation") \ 1501 \ 1502 product(bool, ExplicitGCInvokesConcurrent, false, \ 1503 "A System.gc() request invokes a concurrent collection; " \ 1504 "(effective only when UseConcMarkSweepGC)") \ 1505 \ 1506 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1507 "A System.gc() request invokes a concurrent collection and " \ 1508 "also unloads classes during such a concurrent gc cycle " \ 1509 "(effective only when UseConcMarkSweepGC)") \ 1510 \ 1511 product(bool, GCLockerInvokesConcurrent, false, \ 1512 "The exit of a JNI critical section necessitating a scavenge, " \ 1513 "also kicks off a background concurrent collection") \ 1514 \ 1515 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1516 "How much the GC can expand the eden by while the GC locker " \ 1517 "is active (as a percentage)") \ 1518 \ 1519 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1520 "Number of times to retry allocations when " \ 1521 "blocked by the GC locker") \ 1522 \ 1523 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1524 "Use adaptive free lists in the CMS generation") \ 1525 \ 1526 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1527 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1528 \ 1529 develop(bool, RotateCMSCollectionTypes, false, \ 1530 "Rotate the CMS collections among concurrent and STW") \ 1531 \ 1532 product(bool, UseCMSBestFit, true, \ 1533 "Use CMS best fit allocation strategy") \ 1534 \ 1535 product(bool, UseCMSCollectionPassing, true, \ 1536 "Use passing of collection from background to foreground") \ 1537 \ 1538 product(bool, UseParNewGC, false, \ 1539 "Use parallel threads in the new generation") \ 1540 \ 1541 product(bool, ParallelGCVerbose, false, \ 1542 "Verbose output for parallel gc") \ 1543 \ 1544 product(uintx, ParallelGCBufferWastePct, 10, \ 1545 "Wasted fraction of parallel allocation buffer") \ 1546 \ 1547 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1548 "Retain parallel allocation buffers across scavenges; " \ 1549 "it is disabled because this currently conflicts with " \ 1550 "parallel card scanning under certain conditions.") \ 1551 \ 1552 product(uintx, TargetPLABWastePct, 10, \ 1553 "Target wasted space in last buffer as percent of overall " \ 1554 "allocation") \ 1555 \ 1556 product(uintx, PLABWeight, 75, \ 1557 "Percentage (0-100) used to weigh the current sample when " \ 1558 "computing exponentially decaying average for ResizePLAB") \ 1559 \ 1560 product(bool, ResizePLAB, true, \ 1561 "Dynamically resize (survivor space) promotion LAB's") \ 1562 \ 1563 product(bool, PrintPLAB, false, \ 1564 "Print (survivor space) promotion LAB's sizing decisions") \ 1565 \ 1566 product(intx, ParGCArrayScanChunk, 50, \ 1567 "Scan a subset of object array and push remainder, if array is " \ 1568 "bigger than this") \ 1569 \ 1570 product(bool, ParGCUseLocalOverflow, false, \ 1571 "Instead of a global overflow list, use local overflow stacks") \ 1572 \ 1573 product(bool, ParGCTrimOverflow, true, \ 1574 "Eagerly trim the local overflow lists " \ 1575 "(when ParGCUseLocalOverflow)") \ 1576 \ 1577 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1578 "Simulate work queue overflow in ParNew") \ 1579 \ 1580 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1581 "An `interval' counter that determines how frequently " \ 1582 "we simulate overflow; a smaller number increases frequency") \ 1583 \ 1584 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1585 "The desired number of objects to claim from the overflow list") \ 1586 \ 1587 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1588 "The number of strides per worker thread that we divide up the " \ 1589 "card table scanning work into") \ 1590 \ 1591 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1592 "The number of cards in each chunk of the parallel chunks used " \ 1593 "during card table scanning") \ 1594 \ 1595 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1596 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1597 "for parallel GC") \ 1598 \ 1599 product(uintx, OldPLABWeight, 50, \ 1600 "Percentage (0-100) used to weight the current sample when " \ 1601 "computing exponentially decaying average for resizing " \ 1602 "CMSParPromoteBlocksToClaim") \ 1603 \ 1604 product(bool, ResizeOldPLAB, true, \ 1605 "Dynamically resize (old gen) promotion LAB's") \ 1606 \ 1607 product(bool, PrintOldPLAB, false, \ 1608 "Print (old gen) promotion LAB's sizing decisions") \ 1609 \ 1610 product(uintx, CMSOldPLABMin, 16, \ 1611 "Minimum size of CMS gen promotion LAB caches per worker " \ 1612 "per block size") \ 1613 \ 1614 product(uintx, CMSOldPLABMax, 1024, \ 1615 "Maximum size of CMS gen promotion LAB caches per worker " \ 1616 "per block size") \ 1617 \ 1618 product(uintx, CMSOldPLABNumRefills, 4, \ 1619 "Nominal number of refills of CMS gen promotion LAB cache " \ 1620 "per worker per block size") \ 1621 \ 1622 product(bool, CMSOldPLABResizeQuicker, false, \ 1623 "React on-the-fly during a scavenge to a sudden " \ 1624 "change in block demand rate") \ 1625 \ 1626 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1627 "The tolerance of the phase-change detector for on-the-fly " \ 1628 "PLAB resizing during a scavenge") \ 1629 \ 1630 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1631 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1632 "during a scavenge") \ 1633 \ 1634 product(bool, AlwaysPreTouch, false, \ 1635 "Force all freshly committed pages to be pre-touched") \ 1636 \ 1637 product_pd(uintx, CMSYoungGenPerWorker, \ 1638 "The maximum size of young gen chosen by default per GC worker " \ 1639 "thread available") \ 1640 \ 1641 product(bool, CMSIncrementalMode, false, \ 1642 "Whether CMS GC should operate in \"incremental\" mode") \ 1643 \ 1644 product(uintx, CMSIncrementalDutyCycle, 10, \ 1645 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1646 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1647 "value.") \ 1648 \ 1649 product(bool, CMSIncrementalPacing, true, \ 1650 "Whether the CMS incremental mode duty cycle should be " \ 1651 "automatically adjusted") \ 1652 \ 1653 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1654 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1655 "used when CMSIncrementalPacing is enabled") \ 1656 \ 1657 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1658 "Percentage (0-100) used to add conservatism when computing the " \ 1659 "duty cycle") \ 1660 \ 1661 product(uintx, CMSIncrementalOffset, 0, \ 1662 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1663 "is shifted to the right within the period between young GCs") \ 1664 \ 1665 product(uintx, CMSExpAvgFactor, 50, \ 1666 "Percentage (0-100) used to weigh the current sample when " \ 1667 "computing exponential averages for CMS statistics") \ 1668 \ 1669 product(uintx, CMS_FLSWeight, 75, \ 1670 "Percentage (0-100) used to weigh the current sample when " \ 1671 "computing exponentially decaying averages for CMS FLS " \ 1672 "statistics") \ 1673 \ 1674 product(uintx, CMS_FLSPadding, 1, \ 1675 "The multiple of deviation from mean to use for buffering " \ 1676 "against volatility in free list demand") \ 1677 \ 1678 product(uintx, FLSCoalescePolicy, 2, \ 1679 "CMS: aggressiveness level for coalescing, increasing " \ 1680 "from 0 to 4") \ 1681 \ 1682 product(bool, FLSAlwaysCoalesceLarge, false, \ 1683 "CMS: larger free blocks are always available for coalescing") \ 1684 \ 1685 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1686 "CMS: the smaller the percentage the greater the coalescing " \ 1687 "force") \ 1688 \ 1689 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1690 "CMS: the factor by which to inflate estimated demand of small " \ 1691 "block sizes to prevent coalescing with an adjoining block") \ 1692 \ 1693 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1694 "CMS: the factor by which to inflate estimated demand of large " \ 1695 "block sizes to prevent coalescing with an adjoining block") \ 1696 \ 1697 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1698 "CMS: the factor by which to inflate estimated demand of small " \ 1699 "block sizes to prevent splitting to supply demand for smaller " \ 1700 "blocks") \ 1701 \ 1702 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1703 "CMS: the factor by which to inflate estimated demand of large " \ 1704 "block sizes to prevent splitting to supply demand for smaller " \ 1705 "blocks") \ 1706 \ 1707 product(bool, CMSExtrapolateSweep, false, \ 1708 "CMS: cushion for block demand during sweep") \ 1709 \ 1710 product(uintx, CMS_SweepWeight, 75, \ 1711 "Percentage (0-100) used to weight the current sample when " \ 1712 "computing exponentially decaying average for inter-sweep " \ 1713 "duration") \ 1714 \ 1715 product(uintx, CMS_SweepPadding, 1, \ 1716 "The multiple of deviation from mean to use for buffering " \ 1717 "against volatility in inter-sweep duration") \ 1718 \ 1719 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1720 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1721 "duration exceeds this threshold in milliseconds") \ 1722 \ 1723 develop(bool, CMSTraceIncrementalMode, false, \ 1724 "Trace CMS incremental mode") \ 1725 \ 1726 develop(bool, CMSTraceIncrementalPacing, false, \ 1727 "Trace CMS incremental mode pacing computation") \ 1728 \ 1729 develop(bool, CMSTraceThreadState, false, \ 1730 "Trace the CMS thread state (enable the trace_state() method)") \ 1731 \ 1732 product(bool, CMSClassUnloadingEnabled, true, \ 1733 "Whether class unloading enabled when using CMS GC") \ 1734 \ 1735 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1736 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1737 "count for which classes may not be unloaded") \ 1738 \ 1739 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1740 "Compact when asked to collect CMS gen with " \ 1741 "clear_all_soft_refs()") \ 1742 \ 1743 product(bool, UseCMSCompactAtFullCollection, true, \ 1744 "Use Mark-Sweep-Compact algorithm at full collections") \ 1745 \ 1746 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1747 "Number of CMS full collection done before compaction if > 0") \ 1748 \ 1749 develop(intx, CMSDictionaryChoice, 0, \ 1750 "Use BinaryTreeDictionary as default in the CMS generation") \ 1751 \ 1752 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1753 "Replenish an indexed free list with this number of chunks") \ 1754 \ 1755 product(bool, CMSReplenishIntermediate, true, \ 1756 "Replenish all intermediate free-list caches") \ 1757 \ 1758 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1759 "When satisfying batched demand, split blocks from the " \ 1760 "IndexedFreeList whose size is a multiple of requested size") \ 1761 \ 1762 product(bool, CMSLoopWarn, false, \ 1763 "Warn in case of excessive CMS looping") \ 1764 \ 1765 develop(bool, CMSOverflowEarlyRestoration, false, \ 1766 "Restore preserved marks early") \ 1767 \ 1768 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1769 "Size of marking stack") \ 1770 \ 1771 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1772 "Maximum size of marking stack") \ 1773 \ 1774 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1775 "Simulate frequent marking stack / work queue overflow") \ 1776 \ 1777 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1778 "An \"interval\" counter that determines how frequently " \ 1779 "to simulate overflow; a smaller number increases frequency") \ 1780 \ 1781 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1782 "(Temporary, subject to experimentation) " \ 1783 "Maximum number of abortable preclean iterations, if > 0") \ 1784 \ 1785 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1786 "(Temporary, subject to experimentation) " \ 1787 "Maximum time in abortable preclean (in milliseconds)") \ 1788 \ 1789 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1790 "(Temporary, subject to experimentation) " \ 1791 "Nominal minimum work per abortable preclean iteration") \ 1792 \ 1793 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1794 "(Temporary, subject to experimentation) " \ 1795 "Time that we sleep between iterations when not given " \ 1796 "enough work per iteration") \ 1797 \ 1798 product(uintx, CMSRescanMultiple, 32, \ 1799 "Size (in cards) of CMS parallel rescan task") \ 1800 \ 1801 product(uintx, CMSConcMarkMultiple, 32, \ 1802 "Size (in cards) of CMS concurrent MT marking task") \ 1803 \ 1804 product(bool, CMSAbortSemantics, false, \ 1805 "Whether abort-on-overflow semantics is implemented") \ 1806 \ 1807 product(bool, CMSParallelInitialMarkEnabled, true, \ 1808 "Use the parallel initial mark.") \ 1809 \ 1810 product(bool, CMSParallelRemarkEnabled, true, \ 1811 "Whether parallel remark enabled (only if ParNewGC)") \ 1812 \ 1813 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1814 "Whether parallel remark of survivor space " \ 1815 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1816 \ 1817 product(bool, CMSPLABRecordAlways, true, \ 1818 "Always record survivor space PLAB boundaries (effective only " \ 1819 "if CMSParallelSurvivorRemarkEnabled)") \ 1820 \ 1821 product(bool, CMSEdenChunksRecordAlways, true, \ 1822 "Always record eden chunks used for the parallel initial mark " \ 1823 "or remark of eden") \ 1824 \ 1825 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1826 "Print the eden and the survivor chunks used for the parallel " \ 1827 "initial mark or remark of the eden/survivor spaces") \ 1828 \ 1829 product(bool, CMSConcurrentMTEnabled, true, \ 1830 "Whether multi-threaded concurrent work enabled " \ 1831 "(effective only if ParNewGC)") \ 1832 \ 1833 product(bool, CMSPrecleaningEnabled, true, \ 1834 "Whether concurrent precleaning enabled") \ 1835 \ 1836 product(uintx, CMSPrecleanIter, 3, \ 1837 "Maximum number of precleaning iteration passes") \ 1838 \ 1839 product(uintx, CMSPrecleanNumerator, 2, \ 1840 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1841 "ratio") \ 1842 \ 1843 product(uintx, CMSPrecleanDenominator, 3, \ 1844 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1845 "ratio") \ 1846 \ 1847 product(bool, CMSPrecleanRefLists1, true, \ 1848 "Preclean ref lists during (initial) preclean phase") \ 1849 \ 1850 product(bool, CMSPrecleanRefLists2, false, \ 1851 "Preclean ref lists during abortable preclean phase") \ 1852 \ 1853 product(bool, CMSPrecleanSurvivors1, false, \ 1854 "Preclean survivors during (initial) preclean phase") \ 1855 \ 1856 product(bool, CMSPrecleanSurvivors2, true, \ 1857 "Preclean survivors during abortable preclean phase") \ 1858 \ 1859 product(uintx, CMSPrecleanThreshold, 1000, \ 1860 "Do not iterate again if number of dirty cards is less than this")\ 1861 \ 1862 product(bool, CMSCleanOnEnter, true, \ 1863 "Clean-on-enter optimization for reducing number of dirty cards") \ 1864 \ 1865 product(uintx, CMSRemarkVerifyVariant, 1, \ 1866 "Choose variant (1,2) of verification following remark") \ 1867 \ 1868 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1869 "If Eden size is below this, do not try to schedule remark") \ 1870 \ 1871 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1872 "The Eden occupancy percentage (0-100) at which " \ 1873 "to try and schedule remark pause") \ 1874 \ 1875 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1876 "Start sampling eden top at least before young gen " \ 1877 "occupancy reaches 1/<ratio> of the size at which " \ 1878 "we plan to schedule remark") \ 1879 \ 1880 product(uintx, CMSSamplingGrain, 16*K, \ 1881 "The minimum distance between eden samples for CMS (see above)") \ 1882 \ 1883 product(bool, CMSScavengeBeforeRemark, false, \ 1884 "Attempt scavenge before the CMS remark step") \ 1885 \ 1886 develop(bool, CMSTraceSweeper, false, \ 1887 "Trace some actions of the CMS sweeper") \ 1888 \ 1889 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1890 "Don't drain below this size per parallel worker/thief") \ 1891 \ 1892 manageable(intx, CMSWaitDuration, 2000, \ 1893 "Time in milliseconds that CMS thread waits for young GC") \ 1894 \ 1895 develop(uintx, CMSCheckInterval, 1000, \ 1896 "Interval in milliseconds that CMS thread checks if it " \ 1897 "should start a collection cycle") \ 1898 \ 1899 product(bool, CMSYield, true, \ 1900 "Yield between steps of CMS") \ 1901 \ 1902 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1903 "Bitmap operations should process at most this many bits " \ 1904 "between yields") \ 1905 \ 1906 product(bool, CMSDumpAtPromotionFailure, false, \ 1907 "Dump useful information about the state of the CMS old " \ 1908 "generation upon a promotion failure") \ 1909 \ 1910 product(bool, CMSPrintChunksInDump, false, \ 1911 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1912 "more detailed information about the free chunks") \ 1913 \ 1914 product(bool, CMSPrintObjectsInDump, false, \ 1915 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1916 "more detailed information about the allocated objects") \ 1917 \ 1918 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1919 "Verify that all references across the FLS boundary " \ 1920 "are to valid objects") \ 1921 \ 1922 diagnostic(bool, FLSVerifyLists, false, \ 1923 "Do lots of (expensive) FreeListSpace verification") \ 1924 \ 1925 diagnostic(bool, FLSVerifyIndexTable, false, \ 1926 "Do lots of (expensive) FLS index table verification") \ 1927 \ 1928 develop(bool, FLSVerifyDictionary, false, \ 1929 "Do lots of (expensive) FLS dictionary verification") \ 1930 \ 1931 develop(bool, VerifyBlockOffsetArray, false, \ 1932 "Do (expensive) block offset array verification") \ 1933 \ 1934 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1935 "Maintain _unallocated_block in BlockOffsetArray " \ 1936 "(currently applicable only to CMS collector)") \ 1937 \ 1938 develop(bool, TraceCMSState, false, \ 1939 "Trace the state of the CMS collection") \ 1940 \ 1941 product(intx, RefDiscoveryPolicy, 0, \ 1942 "Select type of reference discovery policy: " \ 1943 "reference-based(0) or referent-based(1)") \ 1944 \ 1945 product(bool, ParallelRefProcEnabled, false, \ 1946 "Enable parallel reference processing whenever possible") \ 1947 \ 1948 product(bool, ParallelRefProcBalancingEnabled, true, \ 1949 "Enable balancing of reference processing queues") \ 1950 \ 1951 product(uintx, CMSTriggerRatio, 80, \ 1952 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1953 "allocated before a CMS collection cycle commences") \ 1954 \ 1955 product(uintx, CMSBootstrapOccupancy, 50, \ 1956 "Percentage CMS generation occupancy at which to " \ 1957 "initiate CMS collection for bootstrapping collection stats") \ 1958 \ 1959 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1960 "Percentage CMS generation occupancy to start a CMS collection " \ 1961 "cycle. A negative value means that CMSTriggerRatio is used") \ 1962 \ 1963 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1964 "Percentage of the (entire) heap occupancy to start a " \ 1965 "concurrent GC cycle. It is used by GCs that trigger a " \ 1966 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1967 "not just one of the generations (e.g., G1). A value of 0 " \ 1968 "denotes 'do constant GC cycles'.") \ 1969 \ 1970 manageable(intx, CMSTriggerInterval, -1, \ 1971 "Commence a CMS collection cycle (at least) every so many " \ 1972 "milliseconds (0 permanently, -1 disabled)") \ 1973 \ 1974 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1975 "Only use occupancy as a criterion for starting a CMS collection")\ 1976 \ 1977 product(uintx, CMSIsTooFullPercentage, 98, \ 1978 "An absolute ceiling above which CMS will always consider the " \ 1979 "unloading of classes when class unloading is enabled") \ 1980 \ 1981 develop(bool, CMSTestInFreeList, false, \ 1982 "Check if the coalesced range is already in the " \ 1983 "free lists as claimed") \ 1984 \ 1985 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1986 "Check that all the garbage collected was returned to the " \ 1987 "free lists") \ 1988 \ 1989 notproduct(bool, ScavengeALot, false, \ 1990 "Force scavenge at every Nth exit from the runtime system " \ 1991 "(N=ScavengeALotInterval)") \ 1992 \ 1993 develop(bool, FullGCALot, false, \ 1994 "Force full gc at every Nth exit from the runtime system " \ 1995 "(N=FullGCALotInterval)") \ 1996 \ 1997 notproduct(bool, GCALotAtAllSafepoints, false, \ 1998 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1999 \ 2000 product(bool, PrintPromotionFailure, false, \ 2001 "Print additional diagnostic information following " \ 2002 "promotion failure") \ 2003 \ 2004 notproduct(bool, PromotionFailureALot, false, \ 2005 "Use promotion failure handling on every youngest generation " \ 2006 "collection") \ 2007 \ 2008 develop(uintx, PromotionFailureALotCount, 1000, \ 2009 "Number of promotion failures occurring at ParGCAllocBuffer " \ 2010 "refill attempts (ParNew) or promotion attempts " \ 2011 "(other young collectors)") \ 2012 \ 2013 develop(uintx, PromotionFailureALotInterval, 5, \ 2014 "Total collections between promotion failures alot") \ 2015 \ 2016 experimental(uintx, WorkStealingSleepMillis, 1, \ 2017 "Sleep time when sleep is used for yields") \ 2018 \ 2019 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2020 "Number of yields before a sleep is done during workstealing") \ 2021 \ 2022 experimental(uintx, WorkStealingHardSpins, 4096, \ 2023 "Number of iterations in a spin loop between checks on " \ 2024 "time out of hard spin") \ 2025 \ 2026 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2027 "Ratio of hard spins to calls to yield") \ 2028 \ 2029 develop(uintx, ObjArrayMarkingStride, 2048, \ 2030 "Number of object array elements to push onto the marking stack " \ 2031 "before pushing a continuation entry") \ 2032 \ 2033 develop(bool, MetadataAllocationFailALot, false, \ 2034 "Fail metadata allocations at intervals controlled by " \ 2035 "MetadataAllocationFailALotInterval") \ 2036 \ 2037 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2038 "Metadata allocation failure a lot interval") \ 2039 \ 2040 develop(bool, TraceMetadataChunkAllocation, false, \ 2041 "Trace chunk metadata allocations") \ 2042 \ 2043 product(bool, TraceMetadataHumongousAllocation, false, \ 2044 "Trace humongous metadata allocations") \ 2045 \ 2046 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2047 "Trace virtual space metadata allocations") \ 2048 \ 2049 notproduct(bool, ExecuteInternalVMTests, false, \ 2050 "Enable execution of internal VM tests") \ 2051 \ 2052 notproduct(bool, VerboseInternalVMTests, false, \ 2053 "Turn on logging for internal VM tests.") \ 2054 \ 2055 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2056 \ 2057 product_pd(bool, ResizeTLAB, \ 2058 "Dynamically resize TLAB size for threads") \ 2059 \ 2060 product(bool, ZeroTLAB, false, \ 2061 "Zero out the newly created TLAB") \ 2062 \ 2063 product(bool, FastTLABRefill, true, \ 2064 "Use fast TLAB refill code") \ 2065 \ 2066 product(bool, PrintTLAB, false, \ 2067 "Print various TLAB related information") \ 2068 \ 2069 product(bool, TLABStats, true, \ 2070 "Provide more detailed and expensive TLAB statistics " \ 2071 "(with PrintTLAB)") \ 2072 \ 2073 product_pd(bool, NeverActAsServerClassMachine, \ 2074 "Never act like a server-class machine") \ 2075 \ 2076 product(bool, AlwaysActAsServerClassMachine, false, \ 2077 "Always act like a server-class machine") \ 2078 \ 2079 product_pd(uint64_t, MaxRAM, \ 2080 "Real memory size (in bytes) used to set maximum heap size") \ 2081 \ 2082 product(bool, AggressiveHeap, false, \ 2083 "Optimize heap options for long-running memory intensive apps") \ 2084 \ 2085 product(uintx, ErgoHeapSizeLimit, 0, \ 2086 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2087 "MaxRAM * MaxRAMPercentage / 100") \ 2088 \ 2089 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2090 "Use CGroup memory limit as physical memory limit for heap " \ 2091 "sizing" \ 2092 "Deprecated, replaced by container support") \ 2093 \ 2094 diagnostic(bool, PrintContainerInfo, false, \ 2095 "Print container related information") \ 2096 \ 2097 diagnostic(bool, PrintActiveCpus, false, \ 2098 "Print the number of CPUs detected in os::active_processor_count") \ 2099 \ 2100 product(uintx, MaxRAMFraction, 4, \ 2101 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2102 "size") \ 2103 \ 2104 product(uintx, DefaultMaxRAMFraction, 4, \ 2105 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2106 "size; deprecated: to be renamed to MaxRAMFraction") \ 2107 \ 2108 product(uintx, MinRAMFraction, 2, \ 2109 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2110 "size on systems with small physical memory size") \ 2111 \ 2112 product(uintx, InitialRAMFraction, 64, \ 2113 "Fraction (1/n) of real memory used for initial heap size") \ 2114 \ 2115 product(double, MaxRAMPercentage, 25.0, \ 2116 "Maximum percentage of real memory used for maximum heap size") \ 2117 \ 2118 product(double, MinRAMPercentage, 50.0, \ 2119 "Minimum percentage of real memory used for maximum heap" \ 2120 "size on systems with small physical memory size") \ 2121 \ 2122 product(double, InitialRAMPercentage, 1.5625, \ 2123 "Percentage of real memory used for initial heap size") \ 2124 \ 2125 product(intx, ActiveProcessorCount, -1, \ 2126 "Specify the CPU count the VM should use and report as active") \ 2127 \ 2128 develop(uintx, MaxVirtMemFraction, 2, \ 2129 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2130 "determining maximum heap size") \ 2131 \ 2132 product(bool, UseAutoGCSelectPolicy, false, \ 2133 "Use automatic collection selection policy") \ 2134 \ 2135 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2136 "Automatic GC selection pause threshold in milliseconds") \ 2137 \ 2138 product(bool, UseAdaptiveSizePolicy, true, \ 2139 "Use adaptive generation sizing policies") \ 2140 \ 2141 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2142 "Use adaptive survivor sizing policies") \ 2143 \ 2144 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2145 "Use adaptive young-old sizing policies at minor collections") \ 2146 \ 2147 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2148 "Use adaptive young-old sizing policies at major collections") \ 2149 \ 2150 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2151 "Include statistics from System.gc() for adaptive size policy") \ 2152 \ 2153 product(bool, UseAdaptiveGCBoundary, false, \ 2154 "Allow young-old boundary to move") \ 2155 \ 2156 develop(bool, TraceAdaptiveGCBoundary, false, \ 2157 "Trace young-old boundary moves") \ 2158 \ 2159 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2160 "Resize the virtual spaces of the young or old generations") \ 2161 \ 2162 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2163 "Policy for changing generation size for throughput goals") \ 2164 \ 2165 product(uintx, AdaptiveSizePausePolicy, 0, \ 2166 "Policy for changing generation size for pause goals") \ 2167 \ 2168 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2169 "Adjust tenured generation to achieve a minor pause goal") \ 2170 \ 2171 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2172 "Adjust young generation to achieve a major pause goal") \ 2173 \ 2174 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2175 "Number of steps where heuristics is used before data is used") \ 2176 \ 2177 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2178 "Number of collections before the adaptive sizing is started") \ 2179 \ 2180 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2181 "Collection interval for printing information; zero means never") \ 2182 \ 2183 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2184 "Use adaptive minimum footprint as a goal") \ 2185 \ 2186 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2187 "Weight given to exponential resizing, between 0 and 100") \ 2188 \ 2189 product(uintx, AdaptiveTimeWeight, 25, \ 2190 "Weight given to time in adaptive policy, between 0 and 100") \ 2191 \ 2192 product(uintx, PausePadding, 1, \ 2193 "How much buffer to keep for pause time") \ 2194 \ 2195 product(uintx, PromotedPadding, 3, \ 2196 "How much buffer to keep for promotion failure") \ 2197 \ 2198 product(uintx, SurvivorPadding, 3, \ 2199 "How much buffer to keep for survivor overflow") \ 2200 \ 2201 product(uintx, ThresholdTolerance, 10, \ 2202 "Allowed collection cost difference between generations") \ 2203 \ 2204 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2205 "If collection costs are within margin, reduce both by full " \ 2206 "delta") \ 2207 \ 2208 product(uintx, YoungGenerationSizeIncrement, 20, \ 2209 "Adaptive size percentage change in young generation") \ 2210 \ 2211 product(uintx, YoungGenerationSizeSupplement, 80, \ 2212 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2213 \ 2214 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2215 "Decay factor to YoungedGenerationSizeSupplement") \ 2216 \ 2217 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2218 "Adaptive size percentage change in tenured generation") \ 2219 \ 2220 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2221 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2222 \ 2223 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2224 "Decay factor to TenuredGenerationSizeIncrement") \ 2225 \ 2226 product(uintx, MaxGCPauseMillis, max_uintx, \ 2227 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2228 "or (G1 Only) the maximum GC time per MMU time slice") \ 2229 \ 2230 product(uintx, GCPauseIntervalMillis, 0, \ 2231 "Time slice for MMU specification") \ 2232 \ 2233 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2234 "Adaptive size policy maximum GC minor pause time goal " \ 2235 "in millisecond") \ 2236 \ 2237 product(uintx, GCTimeRatio, 99, \ 2238 "Adaptive size policy application time to GC time ratio") \ 2239 \ 2240 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2241 "Adaptive size scale down factor for shrinking") \ 2242 \ 2243 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2244 "Adaptive size decays the major cost for long major intervals") \ 2245 \ 2246 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2247 "Time scale over which major costs decay") \ 2248 \ 2249 product(uintx, MinSurvivorRatio, 3, \ 2250 "Minimum ratio of young generation/survivor space size") \ 2251 \ 2252 product(uintx, InitialSurvivorRatio, 8, \ 2253 "Initial ratio of young generation/survivor space size") \ 2254 \ 2255 product(uintx, BaseFootPrintEstimate, 256*M, \ 2256 "Estimate of footprint other than Java Heap") \ 2257 \ 2258 product(bool, UseGCOverheadLimit, true, \ 2259 "Use policy to limit of proportion of time spent in GC " \ 2260 "before an OutOfMemory error is thrown") \ 2261 \ 2262 product(uintx, GCTimeLimit, 98, \ 2263 "Limit of the proportion of time spent in GC before " \ 2264 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2265 \ 2266 product(uintx, GCHeapFreeLimit, 2, \ 2267 "Minimum percentage of free space after a full GC before an " \ 2268 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2269 \ 2270 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2271 "Number of consecutive collections before gc time limit fires") \ 2272 \ 2273 product(bool, PrintAdaptiveSizePolicy, false, \ 2274 "Print information about AdaptiveSizePolicy") \ 2275 \ 2276 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2277 "How far ahead to prefetch destination area (<= 0 means off)") \ 2278 \ 2279 product(intx, PrefetchScanIntervalInBytes, -1, \ 2280 "How far ahead to prefetch scan area (<= 0 means off)") \ 2281 \ 2282 product(intx, PrefetchFieldsAhead, -1, \ 2283 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2284 \ 2285 diagnostic(bool, VerifySilently, false, \ 2286 "Do not print the verification progress") \ 2287 \ 2288 diagnostic(bool, VerifyDuringStartup, false, \ 2289 "Verify memory system before executing any Java code " \ 2290 "during VM initialization") \ 2291 \ 2292 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2293 "Verify system before exiting") \ 2294 \ 2295 diagnostic(bool, VerifyBeforeGC, false, \ 2296 "Verify memory system before GC") \ 2297 \ 2298 diagnostic(bool, VerifyAfterGC, false, \ 2299 "Verify memory system after GC") \ 2300 \ 2301 diagnostic(bool, VerifyDuringGC, false, \ 2302 "Verify memory system during GC (between phases)") \ 2303 \ 2304 diagnostic(ccstrlist, VerifySubSet, "", \ 2305 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2306 "are enabled. One or more sub-systems can be specified " \ 2307 "in a comma separated string. Sub-systems are: " \ 2308 "threads, heap, symbol_table, string_table, codecache, " \ 2309 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2310 "c-heap, codecache_oops") \ 2311 \ 2312 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2313 "Enable parallel memory system verification") \ 2314 \ 2315 diagnostic(bool, DeferInitialCardMark, false, \ 2316 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2317 "may arise from new_pre_store_barrier") \ 2318 \ 2319 diagnostic(bool, VerifyRememberedSets, false, \ 2320 "Verify GC remembered sets") \ 2321 \ 2322 diagnostic(bool, VerifyObjectStartArray, true, \ 2323 "Verify GC object start array if verify before/after") \ 2324 \ 2325 product(bool, DisableExplicitGC, false, \ 2326 "Ignore calls to System.gc()") \ 2327 \ 2328 notproduct(bool, CheckMemoryInitialization, false, \ 2329 "Check memory initialization") \ 2330 \ 2331 product(bool, CollectGen0First, false, \ 2332 "Collect youngest generation before each full GC") \ 2333 \ 2334 diagnostic(bool, BindCMSThreadToCPU, false, \ 2335 "Bind CMS Thread to CPU if possible") \ 2336 \ 2337 diagnostic(uintx, CPUForCMSThread, 0, \ 2338 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2339 \ 2340 product(bool, BindGCTaskThreadsToCPUs, false, \ 2341 "Bind GCTaskThreads to CPUs if possible") \ 2342 \ 2343 product(bool, UseGCTaskAffinity, false, \ 2344 "Use worker affinity when asking for GCTasks") \ 2345 \ 2346 product(uintx, ProcessDistributionStride, 4, \ 2347 "Stride through processors when distributing processes") \ 2348 \ 2349 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2350 "Number of times the coordinator GC thread will sleep while " \ 2351 "yielding before giving up and resuming GC") \ 2352 \ 2353 product(uintx, CMSYieldSleepCount, 0, \ 2354 "Number of times a GC thread (minus the coordinator) " \ 2355 "will sleep while yielding before giving up and resuming GC") \ 2356 \ 2357 /* gc tracing */ \ 2358 manageable(bool, PrintGC, false, \ 2359 "Print message at garbage collection") \ 2360 \ 2361 manageable(bool, PrintGCDetails, false, \ 2362 "Print more details at garbage collection") \ 2363 \ 2364 manageable(bool, PrintGCDateStamps, false, \ 2365 "Print date stamps at garbage collection") \ 2366 \ 2367 manageable(bool, PrintGCTimeStamps, false, \ 2368 "Print timestamps at garbage collection") \ 2369 \ 2370 manageable(bool, PrintGCID, false, \ 2371 "Print an identifier for each garbage collection") \ 2372 \ 2373 product(bool, PrintGCTaskTimeStamps, false, \ 2374 "Print timestamps for individual gc worker thread tasks") \ 2375 \ 2376 develop(intx, ConcGCYieldTimeout, 0, \ 2377 "If non-zero, assert that GC threads yield within this " \ 2378 "number of milliseconds") \ 2379 \ 2380 notproduct(bool, TraceMarkSweep, false, \ 2381 "Trace mark sweep") \ 2382 \ 2383 product(bool, PrintReferenceGC, false, \ 2384 "Print times spent handling reference objects during GC " \ 2385 "(enabled only when PrintGCDetails)") \ 2386 \ 2387 develop(bool, TraceReferenceGC, false, \ 2388 "Trace handling of soft/weak/final/phantom references") \ 2389 \ 2390 develop(bool, TraceFinalizerRegistration, false, \ 2391 "Trace registration of final references") \ 2392 \ 2393 notproduct(bool, TraceScavenge, false, \ 2394 "Trace scavenge") \ 2395 \ 2396 product(bool, IgnoreEmptyClassPaths, false, \ 2397 "Ignore empty path elements in -classpath") \ 2398 \ 2399 product(bool, TraceClassPaths, false, \ 2400 "Trace processing of class paths") \ 2401 \ 2402 product_rw(bool, TraceClassLoading, false, \ 2403 "Trace all classes loaded") \ 2404 \ 2405 product(bool, TraceClassLoadingPreorder, false, \ 2406 "Trace all classes loaded in order referenced (not loaded)") \ 2407 \ 2408 product_rw(bool, TraceClassUnloading, false, \ 2409 "Trace unloading of classes") \ 2410 \ 2411 product_rw(bool, TraceLoaderConstraints, false, \ 2412 "Trace loader constraints") \ 2413 \ 2414 develop(bool, TraceClassLoaderData, false, \ 2415 "Trace class loader loader_data lifetime") \ 2416 \ 2417 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2418 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2419 "Initial size of the boot class loader data metaspace") \ 2420 \ 2421 product(bool, TraceGen0Time, false, \ 2422 "Trace accumulated time for Gen 0 collection") \ 2423 \ 2424 product(bool, TraceGen1Time, false, \ 2425 "Trace accumulated time for Gen 1 collection") \ 2426 \ 2427 product(bool, PrintTenuringDistribution, false, \ 2428 "Print tenuring age information") \ 2429 \ 2430 product_rw(bool, PrintHeapAtGC, false, \ 2431 "Print heap layout before and after each GC") \ 2432 \ 2433 product_rw(bool, PrintHeapAtGCExtended, false, \ 2434 "Print extended information about the layout of the heap " \ 2435 "when -XX:+PrintHeapAtGC is set") \ 2436 \ 2437 product(bool, PrintHeapAtSIGBREAK, true, \ 2438 "Print heap layout in response to SIGBREAK") \ 2439 \ 2440 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2441 "Print a class histogram before any major stop-world GC") \ 2442 \ 2443 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2444 "Print a class histogram after any major stop-world GC") \ 2445 \ 2446 manageable(bool, PrintClassHistogram, false, \ 2447 "Print a histogram of class instances") \ 2448 \ 2449 develop(bool, TraceWorkGang, false, \ 2450 "Trace activities of work gangs") \ 2451 \ 2452 product(bool, TraceParallelOldGCTasks, false, \ 2453 "Trace multithreaded GC activity") \ 2454 \ 2455 develop(bool, TraceBlockOffsetTable, false, \ 2456 "Print BlockOffsetTable maps") \ 2457 \ 2458 develop(bool, TraceCardTableModRefBS, false, \ 2459 "Print CardTableModRefBS maps") \ 2460 \ 2461 develop(bool, TraceGCTaskManager, false, \ 2462 "Trace actions of the GC task manager") \ 2463 \ 2464 develop(bool, TraceGCTaskQueue, false, \ 2465 "Trace actions of the GC task queues") \ 2466 \ 2467 diagnostic(bool, TraceGCTaskThread, false, \ 2468 "Trace actions of the GC task threads") \ 2469 \ 2470 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2471 "Print the time taken by each phase in ParallelOldGC " \ 2472 "(PrintGCDetails must also be enabled)") \ 2473 \ 2474 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2475 "Trace marking phase in ParallelOldGC") \ 2476 \ 2477 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2478 "Trace summary phase in ParallelOldGC") \ 2479 \ 2480 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2481 "Trace compaction phase in ParallelOldGC") \ 2482 \ 2483 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2484 "Trace dense prefix computation for ParallelOldGC") \ 2485 \ 2486 develop(bool, IgnoreLibthreadGPFault, false, \ 2487 "Suppress workaround for libthread GP fault") \ 2488 \ 2489 product(bool, PrintJNIGCStalls, false, \ 2490 "Print diagnostic message when GC is stalled " \ 2491 "by JNI critical section") \ 2492 \ 2493 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2494 "The percentage of the used heap that the instances of a class " \ 2495 "must occupy for the class to generate a trace event") \ 2496 \ 2497 /* GC log rotation setting */ \ 2498 \ 2499 product(bool, UseGCLogFileRotation, false, \ 2500 "Rotate gclog files (for long running applications). It requires "\ 2501 "-Xloggc:<filename>") \ 2502 \ 2503 product(uintx, NumberOfGCLogFiles, 0, \ 2504 "Number of gclog files in rotation " \ 2505 "(default: 0, no rotation)") \ 2506 \ 2507 product(uintx, GCLogFileSize, 8*K, \ 2508 "GC log file size, requires UseGCLogFileRotation. " \ 2509 "Set to 0 to only trigger rotation via jcmd") \ 2510 \ 2511 /* JVMTI heap profiling */ \ 2512 \ 2513 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2514 "Trace JVMTI object tagging calls") \ 2515 \ 2516 diagnostic(bool, VerifyBeforeIteration, false, \ 2517 "Verify memory system before JVMTI iteration") \ 2518 \ 2519 /* compiler interface */ \ 2520 \ 2521 develop(bool, CIPrintCompilerName, false, \ 2522 "when CIPrint is active, print the name of the active compiler") \ 2523 \ 2524 develop(bool, CIPrintCompileQueue, false, \ 2525 "display the contents of the compile queue whenever a " \ 2526 "compilation is enqueued") \ 2527 \ 2528 develop(bool, CIPrintRequests, false, \ 2529 "display every request for compilation") \ 2530 \ 2531 product(bool, CITime, false, \ 2532 "collect timing information for compilation") \ 2533 \ 2534 develop(bool, CITimeEach, false, \ 2535 "display timing information after each successful compilation") \ 2536 \ 2537 develop(bool, CICountOSR, false, \ 2538 "use a separate counter when assigning ids to osr compilations") \ 2539 \ 2540 develop(bool, CICompileNatives, true, \ 2541 "compile native methods if supported by the compiler") \ 2542 \ 2543 develop_pd(bool, CICompileOSR, \ 2544 "compile on stack replacement methods if supported by the " \ 2545 "compiler") \ 2546 \ 2547 develop(bool, CIPrintMethodCodes, false, \ 2548 "print method bytecodes of the compiled code") \ 2549 \ 2550 develop(bool, CIPrintTypeFlow, false, \ 2551 "print the results of ciTypeFlow analysis") \ 2552 \ 2553 develop(bool, CITraceTypeFlow, false, \ 2554 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2555 \ 2556 develop(intx, OSROnlyBCI, -1, \ 2557 "OSR only at this bci. Negative values mean exclude that bci") \ 2558 \ 2559 /* compiler */ \ 2560 \ 2561 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2562 "Number of compiler threads to run") \ 2563 \ 2564 product(intx, CompilationPolicyChoice, 0, \ 2565 "which compilation policy (0/1)") \ 2566 \ 2567 develop(bool, UseStackBanging, true, \ 2568 "use stack banging for stack overflow checks (required for " \ 2569 "proper StackOverflow handling; disable only to measure cost " \ 2570 "of stackbanging)") \ 2571 \ 2572 develop(bool, UseStrictFP, true, \ 2573 "use strict fp if modifier strictfp is set") \ 2574 \ 2575 develop(bool, GenerateSynchronizationCode, true, \ 2576 "generate locking/unlocking code for synchronized methods and " \ 2577 "monitors") \ 2578 \ 2579 develop(bool, GenerateCompilerNullChecks, true, \ 2580 "Generate explicit null checks for loads/stores/calls") \ 2581 \ 2582 develop(bool, GenerateRangeChecks, true, \ 2583 "Generate range checks for array accesses") \ 2584 \ 2585 develop_pd(bool, ImplicitNullChecks, \ 2586 "Generate code for implicit null checks") \ 2587 \ 2588 product_pd(bool, TrapBasedNullChecks, \ 2589 "Generate code for null checks that uses a cmp and trap " \ 2590 "instruction raising SIGTRAP. This is only used if an access to" \ 2591 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2592 "ImplicitNullChecks don't work (PPC64).") \ 2593 \ 2594 product(bool, PrintSafepointStatistics, false, \ 2595 "Print statistics about safepoint synchronization") \ 2596 \ 2597 product(intx, PrintSafepointStatisticsCount, 300, \ 2598 "Total number of safepoint statistics collected " \ 2599 "before printing them out") \ 2600 \ 2601 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2602 "Print safepoint statistics only when safepoint takes " \ 2603 "more than PrintSafepointSatisticsTimeout in millis") \ 2604 \ 2605 product(bool, TraceSafepointCleanupTime, false, \ 2606 "Print the break down of clean up tasks performed during " \ 2607 "safepoint") \ 2608 \ 2609 product(bool, Inline, true, \ 2610 "Enable inlining") \ 2611 \ 2612 product(bool, ClipInlining, true, \ 2613 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2614 \ 2615 develop(bool, UseCHA, true, \ 2616 "Enable CHA") \ 2617 \ 2618 product(bool, UseTypeProfile, true, \ 2619 "Check interpreter profile for historically monomorphic calls") \ 2620 \ 2621 notproduct(bool, TimeCompiler, false, \ 2622 "Time the compiler") \ 2623 \ 2624 diagnostic(bool, PrintInlining, false, \ 2625 "Print inlining optimizations") \ 2626 \ 2627 product(bool, UsePopCountInstruction, false, \ 2628 "Use population count instruction") \ 2629 \ 2630 develop(bool, EagerInitialization, false, \ 2631 "Eagerly initialize classes if possible") \ 2632 \ 2633 develop(bool, TraceMethodReplacement, false, \ 2634 "Print when methods are replaced do to recompilation") \ 2635 \ 2636 develop(bool, PrintMethodFlushing, false, \ 2637 "Print the nmethods being flushed") \ 2638 \ 2639 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2640 "print statistics about method flushing") \ 2641 \ 2642 develop(bool, UseRelocIndex, false, \ 2643 "Use an index to speed random access to relocations") \ 2644 \ 2645 develop(bool, StressCodeBuffers, false, \ 2646 "Exercise code buffer expansion and other rare state changes") \ 2647 \ 2648 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2649 "Generate extra debugging information for non-safepoints in " \ 2650 "nmethods") \ 2651 \ 2652 product(bool, PrintVMOptions, false, \ 2653 "Print flags that appeared on the command line") \ 2654 \ 2655 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2656 "Ignore unrecognized VM options") \ 2657 \ 2658 product(bool, PrintCommandLineFlags, false, \ 2659 "Print flags specified on command line or set by ergonomics") \ 2660 \ 2661 product(bool, PrintFlagsInitial, false, \ 2662 "Print all VM flags before argument processing and exit VM") \ 2663 \ 2664 product(bool, PrintFlagsFinal, false, \ 2665 "Print all VM flags after argument and ergonomic processing") \ 2666 \ 2667 notproduct(bool, PrintFlagsWithComments, false, \ 2668 "Print all VM flags with default values and descriptions and " \ 2669 "exit") \ 2670 \ 2671 diagnostic(bool, SerializeVMOutput, true, \ 2672 "Use a mutex to serialize output to tty and LogFile") \ 2673 \ 2674 diagnostic(bool, DisplayVMOutput, true, \ 2675 "Display all VM output on the tty, independently of LogVMOutput") \ 2676 \ 2677 diagnostic(bool, LogVMOutput, false, \ 2678 "Save VM output to LogFile") \ 2679 \ 2680 diagnostic(ccstr, LogFile, NULL, \ 2681 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2682 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2683 \ 2684 product(ccstr, ErrorFile, NULL, \ 2685 "If an error occurs, save the error data to this file " \ 2686 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2687 \ 2688 product(bool, DisplayVMOutputToStderr, false, \ 2689 "If DisplayVMOutput is true, display all VM output to stderr") \ 2690 \ 2691 product(bool, DisplayVMOutputToStdout, false, \ 2692 "If DisplayVMOutput is true, display all VM output to stdout") \ 2693 \ 2694 product(bool, UseHeavyMonitors, false, \ 2695 "use heavyweight instead of lightweight Java monitors") \ 2696 \ 2697 product(bool, PrintStringTableStatistics, false, \ 2698 "print statistics about the StringTable and SymbolTable") \ 2699 \ 2700 diagnostic(bool, VerifyStringTableAtExit, false, \ 2701 "verify StringTable contents at exit") \ 2702 \ 2703 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2704 "print histogram of the symbol table") \ 2705 \ 2706 notproduct(bool, ExitVMOnVerifyError, false, \ 2707 "standard exit from VM if bytecode verify error " \ 2708 "(only in debug mode)") \ 2709 \ 2710 notproduct(ccstr, AbortVMOnException, NULL, \ 2711 "Call fatal if this exception is thrown. Example: " \ 2712 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2713 \ 2714 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2715 "Call fatal if the exception pointed by AbortVMOnException " \ 2716 "has this message") \ 2717 \ 2718 develop(bool, DebugVtables, false, \ 2719 "add debugging code to vtable dispatch") \ 2720 \ 2721 develop(bool, PrintVtables, false, \ 2722 "print vtables when printing klass") \ 2723 \ 2724 notproduct(bool, PrintVtableStats, false, \ 2725 "print vtables stats at end of run") \ 2726 \ 2727 develop(bool, TraceCreateZombies, false, \ 2728 "trace creation of zombie nmethods") \ 2729 \ 2730 notproduct(bool, IgnoreLockingAssertions, false, \ 2731 "disable locking assertions (for speed)") \ 2732 \ 2733 product(bool, RangeCheckElimination, true, \ 2734 "Eliminate range checks") \ 2735 \ 2736 develop_pd(bool, UncommonNullCast, \ 2737 "track occurrences of null in casts; adjust compiler tactics") \ 2738 \ 2739 develop(bool, TypeProfileCasts, true, \ 2740 "treat casts like calls for purposes of type profiling") \ 2741 \ 2742 develop(bool, DelayCompilationDuringStartup, true, \ 2743 "Delay invoking the compiler until main application class is " \ 2744 "loaded") \ 2745 \ 2746 develop(bool, CompileTheWorld, false, \ 2747 "Compile all methods in all classes in bootstrap class path " \ 2748 "(stress test)") \ 2749 \ 2750 develop(bool, CompileTheWorldPreloadClasses, true, \ 2751 "Preload all classes used by a class before start loading") \ 2752 \ 2753 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2754 "Force a safepoint every n compiles so sweeper can keep up") \ 2755 \ 2756 develop(bool, FillDelaySlots, true, \ 2757 "Fill delay slots (on SPARC only)") \ 2758 \ 2759 develop(bool, TimeLivenessAnalysis, false, \ 2760 "Time computation of bytecode liveness analysis") \ 2761 \ 2762 develop(bool, TraceLivenessGen, false, \ 2763 "Trace the generation of liveness analysis information") \ 2764 \ 2765 notproduct(bool, TraceLivenessQuery, false, \ 2766 "Trace queries of liveness analysis information") \ 2767 \ 2768 notproduct(bool, CollectIndexSetStatistics, false, \ 2769 "Collect information about IndexSets") \ 2770 \ 2771 develop(bool, UseLoopSafepoints, true, \ 2772 "Generate Safepoint nodes in every loop") \ 2773 \ 2774 develop(intx, FastAllocateSizeLimit, 128*K, \ 2775 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2776 "Inline allocations larger than this in doublewords must go slow")\ 2777 \ 2778 product(bool, AggressiveOpts, false, \ 2779 "Enable aggressive optimizations - see arguments.cpp") \ 2780 \ 2781 product_pd(uintx, TypeProfileLevel, \ 2782 "=XYZ, with Z: Type profiling of arguments at call; " \ 2783 "Y: Type profiling of return value at call; " \ 2784 "X: Type profiling of parameters to methods; " \ 2785 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2786 \ 2787 product(intx, TypeProfileArgsLimit, 2, \ 2788 "max number of call arguments to consider for type profiling") \ 2789 \ 2790 product(intx, TypeProfileParmsLimit, 2, \ 2791 "max number of incoming parameters to consider for type profiling"\ 2792 ", -1 for all") \ 2793 \ 2794 /* statistics */ \ 2795 develop(bool, CountCompiledCalls, false, \ 2796 "Count method invocations") \ 2797 \ 2798 notproduct(bool, CountRuntimeCalls, false, \ 2799 "Count VM runtime calls") \ 2800 \ 2801 develop(bool, CountJNICalls, false, \ 2802 "Count jni method invocations") \ 2803 \ 2804 notproduct(bool, CountJVMCalls, false, \ 2805 "Count jvm method invocations") \ 2806 \ 2807 notproduct(bool, CountRemovableExceptions, false, \ 2808 "Count exceptions that could be replaced by branches due to " \ 2809 "inlining") \ 2810 \ 2811 notproduct(bool, ICMissHistogram, false, \ 2812 "Produce histogram of IC misses") \ 2813 \ 2814 notproduct(bool, PrintClassStatistics, false, \ 2815 "Print class statistics at end of run") \ 2816 \ 2817 notproduct(bool, PrintMethodStatistics, false, \ 2818 "Print method statistics at end of run") \ 2819 \ 2820 /* interpreter */ \ 2821 develop(bool, ClearInterpreterLocals, false, \ 2822 "Always clear local variables of interpreter activations upon " \ 2823 "entry") \ 2824 \ 2825 product_pd(bool, RewriteBytecodes, \ 2826 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2827 \ 2828 product_pd(bool, RewriteFrequentPairs, \ 2829 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2830 \ 2831 diagnostic(bool, PrintInterpreter, false, \ 2832 "Print the generated interpreter code") \ 2833 \ 2834 product(bool, UseInterpreter, true, \ 2835 "Use interpreter for non-compiled methods") \ 2836 \ 2837 develop(bool, UseFastSignatureHandlers, true, \ 2838 "Use fast signature handlers for native calls") \ 2839 \ 2840 product(bool, UseLoopCounter, true, \ 2841 "Increment invocation counter on backward branch") \ 2842 \ 2843 product(bool, UseFastEmptyMethods, true, \ 2844 "Use fast method entry code for empty methods") \ 2845 \ 2846 product(bool, UseFastAccessorMethods, true, \ 2847 "Use fast method entry code for accessor methods") \ 2848 \ 2849 product_pd(bool, UseOnStackReplacement, \ 2850 "Use on stack replacement, calls runtime if invoc. counter " \ 2851 "overflows in loop") \ 2852 \ 2853 notproduct(bool, TraceOnStackReplacement, false, \ 2854 "Trace on stack replacement") \ 2855 \ 2856 product_pd(bool, PreferInterpreterNativeStubs, \ 2857 "Use always interpreter stubs for native methods invoked via " \ 2858 "interpreter") \ 2859 \ 2860 develop(bool, CountBytecodes, false, \ 2861 "Count number of bytecodes executed") \ 2862 \ 2863 develop(bool, PrintBytecodeHistogram, false, \ 2864 "Print histogram of the executed bytecodes") \ 2865 \ 2866 develop(bool, PrintBytecodePairHistogram, false, \ 2867 "Print histogram of the executed bytecode pairs") \ 2868 \ 2869 diagnostic(bool, PrintSignatureHandlers, false, \ 2870 "Print code generated for native method signature handlers") \ 2871 \ 2872 develop(bool, VerifyOops, false, \ 2873 "Do plausibility checks for oops") \ 2874 \ 2875 develop(bool, CheckUnhandledOops, false, \ 2876 "Check for unhandled oops in VM code") \ 2877 \ 2878 develop(bool, VerifyJNIFields, trueInDebug, \ 2879 "Verify jfieldIDs for instance fields") \ 2880 \ 2881 notproduct(bool, VerifyJNIEnvThread, false, \ 2882 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2883 "from JNI") \ 2884 \ 2885 develop(bool, VerifyFPU, false, \ 2886 "Verify FPU state (check for NaN's, etc.)") \ 2887 \ 2888 develop(bool, VerifyThread, false, \ 2889 "Watch the thread register for corruption (SPARC only)") \ 2890 \ 2891 develop(bool, VerifyActivationFrameSize, false, \ 2892 "Verify that activation frame didn't become smaller than its " \ 2893 "minimal size") \ 2894 \ 2895 develop(bool, TraceFrequencyInlining, false, \ 2896 "Trace frequency based inlining") \ 2897 \ 2898 develop_pd(bool, InlineIntrinsics, \ 2899 "Inline intrinsics that can be statically resolved") \ 2900 \ 2901 product_pd(bool, ProfileInterpreter, \ 2902 "Profile at the bytecode level during interpretation") \ 2903 \ 2904 develop(bool, TraceProfileInterpreter, false, \ 2905 "Trace profiling at the bytecode level during interpretation. " \ 2906 "This outputs the profiling information collected to improve " \ 2907 "jit compilation.") \ 2908 \ 2909 develop_pd(bool, ProfileTraps, \ 2910 "Profile deoptimization traps at the bytecode level") \ 2911 \ 2912 product(intx, ProfileMaturityPercentage, 20, \ 2913 "number of method invocations/branches (expressed as % of " \ 2914 "CompileThreshold) before using the method's profile") \ 2915 \ 2916 develop(bool, PrintMethodData, false, \ 2917 "Print the results of +ProfileInterpreter at end of run") \ 2918 \ 2919 develop(bool, VerifyDataPointer, trueInDebug, \ 2920 "Verify the method data pointer during interpreter profiling") \ 2921 \ 2922 develop(bool, VerifyCompiledCode, false, \ 2923 "Include miscellaneous runtime verifications in nmethod code; " \ 2924 "default off because it disturbs nmethod size heuristics") \ 2925 \ 2926 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2927 "Manually make GC thread crash then dump java stack trace; " \ 2928 "Test only") \ 2929 \ 2930 /* compilation */ \ 2931 product(bool, UseCompiler, true, \ 2932 "Use Just-In-Time compilation") \ 2933 \ 2934 develop(bool, TraceCompilationPolicy, false, \ 2935 "Trace compilation policy") \ 2936 \ 2937 develop(bool, TimeCompilationPolicy, false, \ 2938 "Time the compilation policy") \ 2939 \ 2940 product(bool, UseCounterDecay, true, \ 2941 "Adjust recompilation counters") \ 2942 \ 2943 develop(intx, CounterHalfLifeTime, 30, \ 2944 "Half-life time of invocation counters (in seconds)") \ 2945 \ 2946 develop(intx, CounterDecayMinIntervalLength, 500, \ 2947 "The minimum interval (in milliseconds) between invocation of " \ 2948 "CounterDecay") \ 2949 \ 2950 product(bool, AlwaysCompileLoopMethods, false, \ 2951 "When using recompilation, never interpret methods " \ 2952 "containing loops") \ 2953 \ 2954 product(bool, DontCompileHugeMethods, true, \ 2955 "Do not compile methods > HugeMethodLimit") \ 2956 \ 2957 /* Bytecode escape analysis estimation. */ \ 2958 product(bool, EstimateArgEscape, true, \ 2959 "Analyze bytecodes to estimate escape state of arguments") \ 2960 \ 2961 product(intx, BCEATraceLevel, 0, \ 2962 "How much tracing to do of bytecode escape analysis estimates") \ 2963 \ 2964 product(intx, MaxBCEAEstimateLevel, 5, \ 2965 "Maximum number of nested calls that are analyzed by BC EA") \ 2966 \ 2967 product(intx, MaxBCEAEstimateSize, 150, \ 2968 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2969 \ 2970 product(intx, AllocatePrefetchStyle, 1, \ 2971 "0 = no prefetch, " \ 2972 "1 = prefetch instructions for each allocation, " \ 2973 "2 = use TLAB watermark to gate allocation prefetch, " \ 2974 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2975 \ 2976 product(intx, AllocatePrefetchDistance, -1, \ 2977 "Distance to prefetch ahead of allocation pointer") \ 2978 \ 2979 product(intx, AllocatePrefetchLines, 3, \ 2980 "Number of lines to prefetch ahead of array allocation pointer") \ 2981 \ 2982 product(intx, AllocateInstancePrefetchLines, 1, \ 2983 "Number of lines to prefetch ahead of instance allocation " \ 2984 "pointer") \ 2985 \ 2986 product(intx, AllocatePrefetchStepSize, 16, \ 2987 "Step size in bytes of sequential prefetch instructions") \ 2988 \ 2989 product(intx, AllocatePrefetchInstr, 0, \ 2990 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2991 \ 2992 /* deoptimization */ \ 2993 develop(bool, TraceDeoptimization, false, \ 2994 "Trace deoptimization") \ 2995 \ 2996 develop(bool, DebugDeoptimization, false, \ 2997 "Tracing various information while debugging deoptimization") \ 2998 \ 2999 product(intx, SelfDestructTimer, 0, \ 3000 "Will cause VM to terminate after a given time (in minutes) " \ 3001 "(0 means off)") \ 3002 \ 3003 product(intx, MaxJavaStackTraceDepth, 1024, \ 3004 "The maximum number of lines in the stack trace for Java " \ 3005 "exceptions (0 means all)") \ 3006 \ 3007 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3008 "Guarantee a safepoint (at least) every so many milliseconds " \ 3009 "(0 means none)")) \ 3010 \ 3011 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3012 "Guarantee a safepoint (at least) every so many milliseconds " \ 3013 "(0 means none)")) \ 3014 \ 3015 product(intx, SafepointTimeoutDelay, 10000, \ 3016 "Delay in milliseconds for option SafepointTimeout") \ 3017 \ 3018 product(intx, NmethodSweepFraction, 16, \ 3019 "Number of invocations of sweeper to cover all nmethods") \ 3020 \ 3021 product(intx, NmethodSweepCheckInterval, 5, \ 3022 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3023 \ 3024 product(intx, NmethodSweepActivity, 10, \ 3025 "Removes cold nmethods from code cache if > 0. Higher values " \ 3026 "result in more aggressive sweeping") \ 3027 \ 3028 notproduct(bool, LogSweeper, false, \ 3029 "Keep a ring buffer of sweeper activity") \ 3030 \ 3031 notproduct(intx, SweeperLogEntries, 1024, \ 3032 "Number of records in the ring buffer of sweeper activity") \ 3033 \ 3034 notproduct(intx, MemProfilingInterval, 500, \ 3035 "Time between each invocation of the MemProfiler") \ 3036 \ 3037 develop(intx, MallocCatchPtr, -1, \ 3038 "Hit breakpoint when mallocing/freeing this pointer") \ 3039 \ 3040 notproduct(intx, AssertRepeat, 1, \ 3041 "number of times to evaluate expression in assert " \ 3042 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3043 \ 3044 notproduct(ccstrlist, SuppressErrorAt, "", \ 3045 "List of assertions (file:line) to muzzle") \ 3046 \ 3047 notproduct(uintx, HandleAllocationLimit, 1024, \ 3048 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3049 "is used") \ 3050 \ 3051 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3052 "Threshold for total handle allocation when " \ 3053 "+TraceHandleAllocation is used") \ 3054 \ 3055 develop(intx, StackPrintLimit, 100, \ 3056 "number of stack frames to print in VM-level stack dump") \ 3057 \ 3058 notproduct(intx, MaxElementPrintSize, 256, \ 3059 "maximum number of elements to print") \ 3060 \ 3061 notproduct(intx, MaxSubklassPrintSize, 4, \ 3062 "maximum number of subklasses to print when printing klass") \ 3063 \ 3064 product(intx, MaxInlineLevel, 9, \ 3065 "maximum number of nested calls that are inlined") \ 3066 \ 3067 product(intx, MaxRecursiveInlineLevel, 1, \ 3068 "maximum number of nested recursive calls that are inlined") \ 3069 \ 3070 develop(intx, MaxForceInlineLevel, 100, \ 3071 "maximum number of nested calls that are forced for inlining " \ 3072 "(using CompilerOracle or marked w/ @ForceInline)") \ 3073 \ 3074 product_pd(intx, InlineSmallCode, \ 3075 "Only inline already compiled methods if their code size is " \ 3076 "less than this") \ 3077 \ 3078 product(intx, MaxInlineSize, 35, \ 3079 "The maximum bytecode size of a method to be inlined") \ 3080 \ 3081 product_pd(intx, FreqInlineSize, \ 3082 "The maximum bytecode size of a frequent method to be inlined") \ 3083 \ 3084 product(intx, MaxTrivialSize, 6, \ 3085 "The maximum bytecode size of a trivial method to be inlined") \ 3086 \ 3087 product(intx, MinInliningThreshold, 250, \ 3088 "The minimum invocation count a method needs to have to be " \ 3089 "inlined") \ 3090 \ 3091 develop(intx, MethodHistogramCutoff, 100, \ 3092 "The cutoff value for method invocation histogram (+CountCalls)") \ 3093 \ 3094 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3095 "Number of interpreted methods to show in profile") \ 3096 \ 3097 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3098 "Number of compiled methods to show in profile") \ 3099 \ 3100 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3101 "Number of stub methods to show in profile") \ 3102 \ 3103 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3104 "Number of runtime stub nodes to show in profile") \ 3105 \ 3106 product(intx, ProfileIntervalsTicks, 100, \ 3107 "Number of ticks between printing of interval profile " \ 3108 "(+ProfileIntervals)") \ 3109 \ 3110 notproduct(intx, ScavengeALotInterval, 1, \ 3111 "Interval between which scavenge will occur with +ScavengeALot") \ 3112 \ 3113 notproduct(intx, FullGCALotInterval, 1, \ 3114 "Interval between which full gc will occur with +FullGCALot") \ 3115 \ 3116 notproduct(intx, FullGCALotStart, 0, \ 3117 "For which invocation to start FullGCAlot") \ 3118 \ 3119 notproduct(intx, FullGCALotDummies, 32*K, \ 3120 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3121 "to move") \ 3122 \ 3123 develop(intx, DontYieldALotInterval, 10, \ 3124 "Interval between which yields will be dropped (milliseconds)") \ 3125 \ 3126 develop(intx, MinSleepInterval, 1, \ 3127 "Minimum sleep() interval (milliseconds) when " \ 3128 "ConvertSleepToYield is off (used for Solaris)") \ 3129 \ 3130 develop(intx, ProfilerPCTickThreshold, 15, \ 3131 "Number of ticks in a PC buckets to be a hotspot") \ 3132 \ 3133 notproduct(intx, DeoptimizeALotInterval, 5, \ 3134 "Number of exits until DeoptimizeALot kicks in") \ 3135 \ 3136 notproduct(intx, ZombieALotInterval, 5, \ 3137 "Number of exits until ZombieALot kicks in") \ 3138 \ 3139 diagnostic(intx, MallocVerifyInterval, 0, \ 3140 "If non-zero, verify C heap after every N calls to " \ 3141 "malloc/realloc/free") \ 3142 \ 3143 diagnostic(intx, MallocVerifyStart, 0, \ 3144 "If non-zero, start verifying C heap after Nth call to " \ 3145 "malloc/realloc/free") \ 3146 \ 3147 diagnostic(uintx, MallocMaxTestWords, 0, \ 3148 "If non-zero, maximum number of words that malloc/realloc can " \ 3149 "allocate (for testing only)") \ 3150 \ 3151 product(intx, TypeProfileWidth, 2, \ 3152 "Number of receiver types to record in call/cast profile") \ 3153 \ 3154 develop(intx, BciProfileWidth, 2, \ 3155 "Number of return bci's to record in ret profile") \ 3156 \ 3157 product(intx, PerMethodRecompilationCutoff, 400, \ 3158 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3159 \ 3160 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3161 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3162 \ 3163 product(intx, PerMethodTrapLimit, 100, \ 3164 "Limit on traps (of one kind) in a method (includes inlines)") \ 3165 \ 3166 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3167 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3168 \ 3169 product(intx, PerBytecodeTrapLimit, 4, \ 3170 "Limit on traps (of one kind) at a particular BCI") \ 3171 \ 3172 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3173 "Extra method data trap entries for speculation") \ 3174 \ 3175 develop(intx, InlineFrequencyRatio, 20, \ 3176 "Ratio of call site execution to caller method invocation") \ 3177 \ 3178 develop_pd(intx, InlineFrequencyCount, \ 3179 "Count of call site execution necessary to trigger frequent " \ 3180 "inlining") \ 3181 \ 3182 develop(intx, InlineThrowCount, 50, \ 3183 "Force inlining of interpreted methods that throw this often") \ 3184 \ 3185 develop(intx, InlineThrowMaxSize, 200, \ 3186 "Force inlining of throwing methods smaller than this") \ 3187 \ 3188 develop(intx, ProfilerNodeSize, 1024, \ 3189 "Size in K to allocate for the Profile Nodes of each thread") \ 3190 \ 3191 product_pd(intx, PreInflateSpin, \ 3192 "Number of times to spin wait before inflation") \ 3193 \ 3194 /* gc parameters */ \ 3195 product(uintx, InitialHeapSize, 0, \ 3196 "Initial heap size (in bytes); zero means use ergonomics") \ 3197 \ 3198 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3199 "Maximum heap size (in bytes)") \ 3200 \ 3201 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3202 "Initial tenured generation size (in bytes)") \ 3203 \ 3204 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3205 "Initial new generation size (in bytes)") \ 3206 \ 3207 product(uintx, MaxNewSize, max_uintx, \ 3208 "Maximum new generation size (in bytes), max_uintx means set " \ 3209 "ergonomically") \ 3210 \ 3211 product(uintx, PretenureSizeThreshold, 0, \ 3212 "Maximum size in bytes of objects allocated in DefNew " \ 3213 "generation; zero means no maximum") \ 3214 \ 3215 product(uintx, TLABSize, 0, \ 3216 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3217 \ 3218 product(uintx, MinTLABSize, 2*K, \ 3219 "Minimum allowed TLAB size (in bytes)") \ 3220 \ 3221 product(uintx, TLABAllocationWeight, 35, \ 3222 "Allocation averaging weight") \ 3223 \ 3224 product(uintx, TLABWasteTargetPercent, 1, \ 3225 "Percentage of Eden that can be wasted") \ 3226 \ 3227 product(uintx, TLABRefillWasteFraction, 64, \ 3228 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3229 \ 3230 product(uintx, TLABWasteIncrement, 4, \ 3231 "Increment allowed waste at slow allocation") \ 3232 \ 3233 product(uintx, SurvivorRatio, 8, \ 3234 "Ratio of eden/survivor space size") \ 3235 \ 3236 product(uintx, NewRatio, 2, \ 3237 "Ratio of old/new generation sizes") \ 3238 \ 3239 product_pd(uintx, NewSizeThreadIncrease, \ 3240 "Additional size added to desired new generation size per " \ 3241 "non-daemon thread (in bytes)") \ 3242 \ 3243 product_pd(uintx, MetaspaceSize, \ 3244 "Initial size of Metaspaces (in bytes)") \ 3245 \ 3246 product(uintx, MaxMetaspaceSize, max_uintx, \ 3247 "Maximum size of Metaspaces (in bytes)") \ 3248 \ 3249 product(uintx, CompressedClassSpaceSize, 1*G, \ 3250 "Maximum size of class area in Metaspace when compressed " \ 3251 "class pointers are used") \ 3252 \ 3253 manageable(uintx, MinHeapFreeRatio, 40, \ 3254 "The minimum percentage of heap free after GC to avoid expansion."\ 3255 " For most GCs this applies to the old generation. In G1 and" \ 3256 " ParallelGC it applies to the whole heap.") \ 3257 \ 3258 manageable(uintx, MaxHeapFreeRatio, 70, \ 3259 "The maximum percentage of heap free after GC to avoid shrinking."\ 3260 " For most GCs this applies to the old generation. In G1 and" \ 3261 " ParallelGC it applies to the whole heap.") \ 3262 \ 3263 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3264 "Number of milliseconds per MB of free space in the heap") \ 3265 \ 3266 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3267 "The minimum change in heap space due to GC (in bytes)") \ 3268 \ 3269 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3270 "The minimum expansion of Metaspace (in bytes)") \ 3271 \ 3272 product(uintx, MinMetaspaceFreeRatio, 40, \ 3273 "The minimum percentage of Metaspace free after GC to avoid " \ 3274 "expansion") \ 3275 \ 3276 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3277 "The maximum percentage of Metaspace free after GC to avoid " \ 3278 "shrinking") \ 3279 \ 3280 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3281 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3282 \ 3283 product(uintx, QueuedAllocationWarningCount, 0, \ 3284 "Number of times an allocation that queues behind a GC " \ 3285 "will retry before printing a warning") \ 3286 \ 3287 diagnostic(uintx, VerifyGCStartAt, 0, \ 3288 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3289 \ 3290 diagnostic(intx, VerifyGCLevel, 0, \ 3291 "Generation level at which to start +VerifyBefore/AfterGC") \ 3292 \ 3293 product(uintx, MaxTenuringThreshold, 15, \ 3294 "Maximum value for tenuring threshold") \ 3295 \ 3296 product(uintx, InitialTenuringThreshold, 7, \ 3297 "Initial value for tenuring threshold") \ 3298 \ 3299 product(uintx, TargetSurvivorRatio, 50, \ 3300 "Desired percentage of survivor space used after scavenge") \ 3301 \ 3302 product(uintx, MarkSweepDeadRatio, 5, \ 3303 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3304 "Serial mark sweep treats this as both the minimum and maximum " \ 3305 "value. " \ 3306 "CMS uses this value only if it falls back to mark sweep. " \ 3307 "Par compact uses a variable scale based on the density of the " \ 3308 "generation and treats this as the maximum value when the heap " \ 3309 "is either completely full or completely empty. Par compact " \ 3310 "also has a smaller default value; see arguments.cpp.") \ 3311 \ 3312 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3313 "How often should we fully compact the heap (ignoring the dead " \ 3314 "space parameters)") \ 3315 \ 3316 product(intx, PrintCMSStatistics, 0, \ 3317 "Statistics for CMS") \ 3318 \ 3319 product(bool, PrintCMSInitiationStatistics, false, \ 3320 "Statistics for initiating a CMS collection") \ 3321 \ 3322 product(intx, PrintFLSStatistics, 0, \ 3323 "Statistics for CMS' FreeListSpace") \ 3324 \ 3325 product(intx, PrintFLSCensus, 0, \ 3326 "Census for CMS' FreeListSpace") \ 3327 \ 3328 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3329 "Delay between expansion and allocation (in milliseconds)") \ 3330 \ 3331 develop(uintx, GCWorkerDelayMillis, 0, \ 3332 "Delay in scheduling GC workers (in milliseconds)") \ 3333 \ 3334 product(intx, DeferThrSuspendLoopCount, 4000, \ 3335 "(Unstable) Number of times to iterate in safepoint loop " \ 3336 "before blocking VM threads ") \ 3337 \ 3338 product(intx, DeferPollingPageLoopCount, -1, \ 3339 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3340 "before changing safepoint polling page to RO ") \ 3341 \ 3342 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3343 \ 3344 product(bool, PSChunkLargeArrays, true, \ 3345 "Process large arrays in chunks") \ 3346 \ 3347 product(uintx, GCDrainStackTargetSize, 64, \ 3348 "Number of entries we will try to leave on the stack " \ 3349 "during parallel gc") \ 3350 \ 3351 /* stack parameters */ \ 3352 product_pd(intx, StackYellowPages, \ 3353 "Number of yellow zone (recoverable overflows) pages") \ 3354 \ 3355 product_pd(intx, StackRedPages, \ 3356 "Number of red zone (unrecoverable overflows) pages") \ 3357 \ 3358 product_pd(intx, StackShadowPages, \ 3359 "Number of shadow zone (for overflow checking) pages " \ 3360 "this should exceed the depth of the VM and native call stack") \ 3361 \ 3362 product_pd(intx, ThreadStackSize, \ 3363 "Thread Stack Size (in Kbytes)") \ 3364 \ 3365 product_pd(intx, VMThreadStackSize, \ 3366 "Non-Java Thread Stack Size (in Kbytes)") \ 3367 \ 3368 product_pd(intx, CompilerThreadStackSize, \ 3369 "Compiler Thread Stack Size (in Kbytes)") \ 3370 \ 3371 develop_pd(uintx, JVMInvokeMethodSlack, \ 3372 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3373 \ 3374 product(uintx, ThreadSafetyMargin, 50*M, \ 3375 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3376 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3377 "disable this feature") \ 3378 \ 3379 /* code cache parameters */ \ 3380 /* ppc64 has large code-entry alignment. */ \ 3381 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \ 3382 "Code cache segment size (in bytes) - smallest unit of " \ 3383 "allocation") \ 3384 \ 3385 develop_pd(intx, CodeEntryAlignment, \ 3386 "Code entry alignment for generated code (in bytes)") \ 3387 \ 3388 product_pd(intx, OptoLoopAlignment, \ 3389 "Align inner loops to zero relative to this modulus") \ 3390 \ 3391 product_pd(uintx, InitialCodeCacheSize, \ 3392 "Initial code cache size (in bytes)") \ 3393 \ 3394 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3395 "Minimum code cache size (in bytes) required to start VM.") \ 3396 \ 3397 product_pd(uintx, ReservedCodeCacheSize, \ 3398 "Reserved code cache size (in bytes) - maximum code cache size") \ 3399 \ 3400 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3401 "When less than X space left, we stop compiling") \ 3402 \ 3403 product_pd(uintx, CodeCacheExpansionSize, \ 3404 "Code cache expansion size (in bytes)") \ 3405 \ 3406 develop_pd(uintx, CodeCacheMinBlockLength, \ 3407 "Minimum number of segments in a code cache block") \ 3408 \ 3409 notproduct(bool, ExitOnFullCodeCache, false, \ 3410 "Exit the VM if we fill the code cache") \ 3411 \ 3412 product(bool, UseCodeCacheFlushing, true, \ 3413 "Remove cold/old nmethods from the code cache") \ 3414 \ 3415 /* interpreter debugging */ \ 3416 develop(intx, BinarySwitchThreshold, 5, \ 3417 "Minimal number of lookupswitch entries for rewriting to binary " \ 3418 "switch") \ 3419 \ 3420 develop(intx, StopInterpreterAt, 0, \ 3421 "Stop interpreter execution at specified bytecode number") \ 3422 \ 3423 develop(intx, TraceBytecodesAt, 0, \ 3424 "Trace bytecodes starting with specified bytecode number") \ 3425 \ 3426 /* compiler interface */ \ 3427 develop(intx, CIStart, 0, \ 3428 "The id of the first compilation to permit") \ 3429 \ 3430 develop(intx, CIStop, max_jint, \ 3431 "The id of the last compilation to permit") \ 3432 \ 3433 develop(intx, CIStartOSR, 0, \ 3434 "The id of the first osr compilation to permit " \ 3435 "(CICountOSR must be on)") \ 3436 \ 3437 develop(intx, CIStopOSR, max_jint, \ 3438 "The id of the last osr compilation to permit " \ 3439 "(CICountOSR must be on)") \ 3440 \ 3441 develop(intx, CIBreakAtOSR, -1, \ 3442 "The id of osr compilation to break at") \ 3443 \ 3444 develop(intx, CIBreakAt, -1, \ 3445 "The id of compilation to break at") \ 3446 \ 3447 product(ccstrlist, CompileOnly, "", \ 3448 "List of methods (pkg/class.name) to restrict compilation to") \ 3449 \ 3450 product(ccstr, CompileCommandFile, NULL, \ 3451 "Read compiler commands from this file [.hotspot_compiler]") \ 3452 \ 3453 product(ccstrlist, CompileCommand, "", \ 3454 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3455 \ 3456 develop(bool, ReplayCompiles, false, \ 3457 "Enable replay of compilations from ReplayDataFile") \ 3458 \ 3459 product(ccstr, ReplayDataFile, NULL, \ 3460 "File containing compilation replay information" \ 3461 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3462 \ 3463 product(ccstr, InlineDataFile, NULL, \ 3464 "File containing inlining replay information" \ 3465 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3466 \ 3467 develop(intx, ReplaySuppressInitializers, 2, \ 3468 "Control handling of class initialization during replay: " \ 3469 "0 - don't do anything special; " \ 3470 "1 - treat all class initializers as empty; " \ 3471 "2 - treat class initializers for application classes as empty; " \ 3472 "3 - allow all class initializers to run during bootstrap but " \ 3473 " pretend they are empty after starting replay") \ 3474 \ 3475 develop(bool, ReplayIgnoreInitErrors, false, \ 3476 "Ignore exceptions thrown during initialization for replay") \ 3477 \ 3478 product(bool, DumpReplayDataOnError, true, \ 3479 "Record replay data for crashing compiler threads") \ 3480 \ 3481 product(bool, CICompilerCountPerCPU, false, \ 3482 "1 compiler thread for log(N CPUs)") \ 3483 \ 3484 develop(intx, CIFireOOMAt, -1, \ 3485 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3486 "(non-negative value throws OOM after this many CI accesses " \ 3487 "in each compile)") \ 3488 notproduct(intx, CICrashAt, -1, \ 3489 "id of compilation to trigger assert in compiler thread for " \ 3490 "the purpose of testing, e.g. generation of replay data") \ 3491 notproduct(bool, CIObjectFactoryVerify, false, \ 3492 "enable potentially expensive verification in ciObjectFactory") \ 3493 \ 3494 /* Priorities */ \ 3495 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3496 \ 3497 product(intx, ThreadPriorityPolicy, 0, \ 3498 "0 : Normal. "\ 3499 " VM chooses priorities that are appropriate for normal "\ 3500 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3501 " to normal native priority. Java priorities below " \ 3502 " NORM_PRIORITY map to lower native priority values. On "\ 3503 " Windows applications are allowed to use higher native "\ 3504 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3505 " not use the highest possible native priority, "\ 3506 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3507 " system threads. On Linux thread priorities are ignored "\ 3508 " because the OS does not support static priority in "\ 3509 " SCHED_OTHER scheduling class which is the only choice for "\ 3510 " non-root, non-realtime applications. "\ 3511 "1 : Aggressive. "\ 3512 " Java thread priorities map over to the entire range of "\ 3513 " native thread priorities. Higher Java thread priorities map "\ 3514 " to higher native thread priorities. This policy should be "\ 3515 " used with care, as sometimes it can cause performance "\ 3516 " degradation in the application and/or the entire system. On "\ 3517 " Linux this policy requires root privilege.") \ 3518 \ 3519 product(bool, ThreadPriorityVerbose, false, \ 3520 "Print priority changes") \ 3521 \ 3522 product(intx, DefaultThreadPriority, -1, \ 3523 "The native priority at which threads run if not elsewhere " \ 3524 "specified (-1 means no change)") \ 3525 \ 3526 product(intx, CompilerThreadPriority, -1, \ 3527 "The native priority at which compiler threads should run " \ 3528 "(-1 means no change)") \ 3529 \ 3530 product(intx, VMThreadPriority, -1, \ 3531 "The native priority at which the VM thread should run " \ 3532 "(-1 means no change)") \ 3533 \ 3534 product(bool, CompilerThreadHintNoPreempt, true, \ 3535 "(Solaris only) Give compiler threads an extra quanta") \ 3536 \ 3537 product(bool, VMThreadHintNoPreempt, false, \ 3538 "(Solaris only) Give VM thread an extra quanta") \ 3539 \ 3540 product(intx, JavaPriority1_To_OSPriority, -1, \ 3541 "Map Java priorities to OS priorities") \ 3542 \ 3543 product(intx, JavaPriority2_To_OSPriority, -1, \ 3544 "Map Java priorities to OS priorities") \ 3545 \ 3546 product(intx, JavaPriority3_To_OSPriority, -1, \ 3547 "Map Java priorities to OS priorities") \ 3548 \ 3549 product(intx, JavaPriority4_To_OSPriority, -1, \ 3550 "Map Java priorities to OS priorities") \ 3551 \ 3552 product(intx, JavaPriority5_To_OSPriority, -1, \ 3553 "Map Java priorities to OS priorities") \ 3554 \ 3555 product(intx, JavaPriority6_To_OSPriority, -1, \ 3556 "Map Java priorities to OS priorities") \ 3557 \ 3558 product(intx, JavaPriority7_To_OSPriority, -1, \ 3559 "Map Java priorities to OS priorities") \ 3560 \ 3561 product(intx, JavaPriority8_To_OSPriority, -1, \ 3562 "Map Java priorities to OS priorities") \ 3563 \ 3564 product(intx, JavaPriority9_To_OSPriority, -1, \ 3565 "Map Java priorities to OS priorities") \ 3566 \ 3567 product(intx, JavaPriority10_To_OSPriority,-1, \ 3568 "Map Java priorities to OS priorities") \ 3569 \ 3570 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3571 "Java thread priority 10 maps to critical scheduling priority") \ 3572 \ 3573 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3574 "Compiler thread(s) run at critical scheduling priority") \ 3575 \ 3576 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3577 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3578 \ 3579 /* compiler debugging */ \ 3580 notproduct(intx, CompileTheWorldStartAt, 1, \ 3581 "First class to consider when using +CompileTheWorld") \ 3582 \ 3583 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3584 "Last class to consider when using +CompileTheWorld") \ 3585 \ 3586 develop(intx, NewCodeParameter, 0, \ 3587 "Testing Only: Create a dedicated integer parameter before " \ 3588 "putback") \ 3589 \ 3590 /* new oopmap storage allocation */ \ 3591 develop(intx, MinOopMapAllocation, 8, \ 3592 "Minimum number of OopMap entries in an OopMapSet") \ 3593 \ 3594 /* Background Compilation */ \ 3595 develop(intx, LongCompileThreshold, 50, \ 3596 "Used with +TraceLongCompiles") \ 3597 \ 3598 product(intx, StarvationMonitorInterval, 200, \ 3599 "Pause between each check (in milliseconds)") \ 3600 \ 3601 /* recompilation */ \ 3602 product_pd(intx, CompileThreshold, \ 3603 "number of interpreted method invocations before (re-)compiling") \ 3604 \ 3605 product_pd(intx, BackEdgeThreshold, \ 3606 "Interpreter Back edge threshold at which an OSR compilation is " \ 3607 "invoked") \ 3608 \ 3609 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3610 "Interpreter (tier 0) invocation notification frequency") \ 3611 \ 3612 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3613 "C1 without MDO (tier 2) invocation notification frequency") \ 3614 \ 3615 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3616 "C1 with MDO profiling (tier 3) invocation notification " \ 3617 "frequency") \ 3618 \ 3619 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3620 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3621 \ 3622 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3623 "Interpreter (tier 0) invocation notification frequency") \ 3624 \ 3625 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3626 "C1 without MDO (tier 2) invocation notification frequency") \ 3627 \ 3628 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3629 "C1 with MDO profiling (tier 3) invocation notification " \ 3630 "frequency") \ 3631 \ 3632 product(intx, Tier2CompileThreshold, 0, \ 3633 "threshold at which tier 2 compilation is invoked") \ 3634 \ 3635 product(intx, Tier2BackEdgeThreshold, 0, \ 3636 "Back edge threshold at which tier 2 compilation is invoked") \ 3637 \ 3638 product(intx, Tier3InvocationThreshold, 200, \ 3639 "Compile if number of method invocations crosses this " \ 3640 "threshold") \ 3641 \ 3642 product(intx, Tier3MinInvocationThreshold, 100, \ 3643 "Minimum invocation to compile at tier 3") \ 3644 \ 3645 product(intx, Tier3CompileThreshold, 2000, \ 3646 "Threshold at which tier 3 compilation is invoked (invocation " \ 3647 "minimum must be satisfied") \ 3648 \ 3649 product(intx, Tier3BackEdgeThreshold, 60000, \ 3650 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3651 \ 3652 product(intx, Tier4InvocationThreshold, 5000, \ 3653 "Compile if number of method invocations crosses this " \ 3654 "threshold") \ 3655 \ 3656 product(intx, Tier4MinInvocationThreshold, 600, \ 3657 "Minimum invocation to compile at tier 4") \ 3658 \ 3659 product(intx, Tier4CompileThreshold, 15000, \ 3660 "Threshold at which tier 4 compilation is invoked (invocation " \ 3661 "minimum must be satisfied") \ 3662 \ 3663 product(intx, Tier4BackEdgeThreshold, 40000, \ 3664 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3665 \ 3666 product(intx, Tier3DelayOn, 5, \ 3667 "If C2 queue size grows over this amount per compiler thread " \ 3668 "stop compiling at tier 3 and start compiling at tier 2") \ 3669 \ 3670 product(intx, Tier3DelayOff, 2, \ 3671 "If C2 queue size is less than this amount per compiler thread " \ 3672 "allow methods compiled at tier 2 transition to tier 3") \ 3673 \ 3674 product(intx, Tier3LoadFeedback, 5, \ 3675 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3676 "reaches this amount per compiler thread") \ 3677 \ 3678 product(intx, Tier4LoadFeedback, 3, \ 3679 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3680 "reaches this amount per compiler thread") \ 3681 \ 3682 product(intx, TieredCompileTaskTimeout, 50, \ 3683 "Kill compile task if method was not used within " \ 3684 "given timeout in milliseconds") \ 3685 \ 3686 product(intx, TieredStopAtLevel, 4, \ 3687 "Stop at given compilation level") \ 3688 \ 3689 product(intx, Tier0ProfilingStartPercentage, 200, \ 3690 "Start profiling in interpreter if the counters exceed tier 3 " \ 3691 "thresholds by the specified percentage") \ 3692 \ 3693 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3694 "Increase the compile threshold for C1 compilation if the code " \ 3695 "cache is filled by the specified percentage") \ 3696 \ 3697 product(intx, TieredRateUpdateMinTime, 1, \ 3698 "Minimum rate sampling interval (in milliseconds)") \ 3699 \ 3700 product(intx, TieredRateUpdateMaxTime, 25, \ 3701 "Maximum rate sampling interval (in milliseconds)") \ 3702 \ 3703 product_pd(bool, TieredCompilation, \ 3704 "Enable tiered compilation") \ 3705 \ 3706 product(bool, PrintTieredEvents, false, \ 3707 "Print tiered events notifications") \ 3708 \ 3709 product_pd(intx, OnStackReplacePercentage, \ 3710 "NON_TIERED number of method invocations/branches (expressed as " \ 3711 "% of CompileThreshold) before (re-)compiling OSR code") \ 3712 \ 3713 product(intx, InterpreterProfilePercentage, 33, \ 3714 "NON_TIERED number of method invocations/branches (expressed as " \ 3715 "% of CompileThreshold) before profiling in the interpreter") \ 3716 \ 3717 develop(intx, MaxRecompilationSearchLength, 10, \ 3718 "The maximum number of frames to inspect when searching for " \ 3719 "recompilee") \ 3720 \ 3721 develop(intx, MaxInterpretedSearchLength, 3, \ 3722 "The maximum number of interpreted frames to skip when searching "\ 3723 "for recompilee") \ 3724 \ 3725 develop(intx, DesiredMethodLimit, 8000, \ 3726 "The desired maximum method size (in bytecodes) after inlining") \ 3727 \ 3728 develop(intx, HugeMethodLimit, 8000, \ 3729 "Don't compile methods larger than this if " \ 3730 "+DontCompileHugeMethods") \ 3731 \ 3732 /* New JDK 1.4 reflection implementation */ \ 3733 \ 3734 develop(bool, UseNewReflection, true, \ 3735 "Temporary flag for transition to reflection based on dynamic " \ 3736 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3737 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3738 "changes were needed") \ 3739 \ 3740 develop(bool, VerifyReflectionBytecodes, false, \ 3741 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3742 "in situations like that described in 4486457 or for " \ 3743 "constructors generated for serialization, so can not be enabled "\ 3744 "in product.") \ 3745 \ 3746 product(bool, ReflectionWrapResolutionErrors, true, \ 3747 "Temporary flag for transition to AbstractMethodError wrapped " \ 3748 "in InvocationTargetException. See 6531596") \ 3749 \ 3750 develop(intx, FastSuperclassLimit, 8, \ 3751 "Depth of hardwired instanceof accelerator array") \ 3752 \ 3753 /* Properties for Java libraries */ \ 3754 \ 3755 product(uintx, MaxDirectMemorySize, 0, \ 3756 "Maximum total size of NIO direct-buffer allocations") \ 3757 \ 3758 /* temporary developer defined flags */ \ 3759 \ 3760 diagnostic(bool, UseNewCode, false, \ 3761 "Testing Only: Use the new version while testing") \ 3762 \ 3763 diagnostic(bool, UseNewCode2, false, \ 3764 "Testing Only: Use the new version while testing") \ 3765 \ 3766 diagnostic(bool, UseNewCode3, false, \ 3767 "Testing Only: Use the new version while testing") \ 3768 \ 3769 /* flags for performance data collection */ \ 3770 \ 3771 product(bool, UsePerfData, falseInEmbedded, \ 3772 "Flag to disable jvmstat instrumentation for performance testing "\ 3773 "and problem isolation purposes") \ 3774 \ 3775 product(bool, PerfDataSaveToFile, false, \ 3776 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3777 \ 3778 product(ccstr, PerfDataSaveFile, NULL, \ 3779 "Save PerfData memory to the specified absolute pathname. " \ 3780 "The string %p in the file name (if present) " \ 3781 "will be replaced by pid") \ 3782 \ 3783 product(intx, PerfDataSamplingInterval, 50, \ 3784 "Data sampling interval (in milliseconds)") \ 3785 \ 3786 develop(bool, PerfTraceDataCreation, false, \ 3787 "Trace creation of Performance Data Entries") \ 3788 \ 3789 develop(bool, PerfTraceMemOps, false, \ 3790 "Trace PerfMemory create/attach/detach calls") \ 3791 \ 3792 product(bool, PerfDisableSharedMem, false, \ 3793 "Store performance data in standard memory") \ 3794 \ 3795 product(intx, PerfDataMemorySize, 32*K, \ 3796 "Size of performance data memory region. Will be rounded " \ 3797 "up to a multiple of the native os page size.") \ 3798 \ 3799 product(intx, PerfMaxStringConstLength, 1024, \ 3800 "Maximum PerfStringConstant string length before truncation") \ 3801 \ 3802 product(bool, PerfAllowAtExitRegistration, false, \ 3803 "Allow registration of atexit() methods") \ 3804 \ 3805 product(bool, PerfBypassFileSystemCheck, false, \ 3806 "Bypass Win32 file system criteria checks (Windows Only)") \ 3807 \ 3808 product(intx, UnguardOnExecutionViolation, 0, \ 3809 "Unguard page and retry on no-execute fault (Win32 only) " \ 3810 "0=off, 1=conservative, 2=aggressive") \ 3811 \ 3812 /* Serviceability Support */ \ 3813 \ 3814 product(bool, ManagementServer, false, \ 3815 "Create JMX Management Server") \ 3816 \ 3817 product(bool, DisableAttachMechanism, false, \ 3818 "Disable mechanism that allows tools to attach to this VM") \ 3819 \ 3820 product(bool, StartAttachListener, false, \ 3821 "Always start Attach Listener at VM startup") \ 3822 \ 3823 manageable(bool, PrintConcurrentLocks, false, \ 3824 "Print java.util.concurrent locks in thread dump") \ 3825 \ 3826 product(bool, TransmitErrorReport, false, \ 3827 "Enable error report transmission on erroneous termination") \ 3828 \ 3829 product(ccstr, ErrorReportServer, NULL, \ 3830 "Override built-in error report server address") \ 3831 \ 3832 /* Shared spaces */ \ 3833 \ 3834 product(bool, UseSharedSpaces, true, \ 3835 "Use shared spaces for metadata") \ 3836 \ 3837 product(bool, VerifySharedSpaces, false, \ 3838 "Verify shared spaces (false for default archive, true for " \ 3839 "archive specified by -XX:SharedArchiveFile)") \ 3840 \ 3841 product(bool, RequireSharedSpaces, false, \ 3842 "Require shared spaces for metadata") \ 3843 \ 3844 product(bool, DumpSharedSpaces, false, \ 3845 "Special mode: JVM reads a class list, loads classes, builds " \ 3846 "shared spaces, and dumps the shared spaces to a file to be " \ 3847 "used in future JVM runs") \ 3848 \ 3849 product(bool, PrintSharedSpaces, false, \ 3850 "Print usage of shared spaces") \ 3851 \ 3852 product(bool, PrintSharedArchiveAndExit, false, \ 3853 "Print shared archive file contents") \ 3854 \ 3855 product(bool, PrintSharedDictionary, false, \ 3856 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3857 "dictionary") \ 3858 \ 3859 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3860 "Size of read-write space for metadata (in bytes)") \ 3861 \ 3862 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3863 "Size of read-only space for metadata (in bytes)") \ 3864 \ 3865 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3866 "Size of the shared miscellaneous data area (in bytes)") \ 3867 \ 3868 product(uintx, SharedMiscCodeSize, AARCH64_ONLY(192*K) NOT_AARCH64(120*K), \ 3869 "Size of the shared miscellaneous code area (in bytes)") \ 3870 \ 3871 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3872 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3873 "Address to allocate shared memory region for class data") \ 3874 \ 3875 diagnostic(bool, EnableInvokeDynamic, true, \ 3876 "support JSR 292 (method handles, invokedynamic, " \ 3877 "anonymous classes") \ 3878 \ 3879 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3880 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3881 "classes. Just exclude them from the shared dictionary.") \ 3882 \ 3883 diagnostic(bool, PrintMethodHandleStubs, false, \ 3884 "Print generated stub code for method handles") \ 3885 \ 3886 develop(bool, TraceMethodHandles, false, \ 3887 "trace internal method handle operations") \ 3888 \ 3889 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3890 "perform extra checks when constructing method handles") \ 3891 \ 3892 diagnostic(bool, ShowHiddenFrames, false, \ 3893 "show method handle implementation frames (usually hidden)") \ 3894 \ 3895 experimental(bool, TrustFinalNonStaticFields, false, \ 3896 "trust final non-static declarations for constant folding") \ 3897 \ 3898 diagnostic(bool, FoldStableValues, true, \ 3899 "Optimize loads from stable fields (marked w/ @Stable)") \ 3900 \ 3901 develop(bool, TraceInvokeDynamic, false, \ 3902 "trace internal invoke dynamic operations") \ 3903 \ 3904 diagnostic(bool, PauseAtStartup, false, \ 3905 "Causes the VM to pause at startup time and wait for the pause " \ 3906 "file to be removed (default: ./vm.paused.<pid>)") \ 3907 \ 3908 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3909 "The file to create and for whose removal to await when pausing " \ 3910 "at startup. (default: ./vm.paused.<pid>)") \ 3911 \ 3912 diagnostic(bool, PauseAtExit, false, \ 3913 "Pause and wait for keypress on exit if a debugger is attached") \ 3914 \ 3915 product(bool, ExtendedDTraceProbes, false, \ 3916 "Enable performance-impacting dtrace probes") \ 3917 \ 3918 product(bool, DTraceMethodProbes, false, \ 3919 "Enable dtrace probes for method-entry and method-exit") \ 3920 \ 3921 product(bool, DTraceAllocProbes, false, \ 3922 "Enable dtrace probes for object allocation") \ 3923 \ 3924 product(bool, DTraceMonitorProbes, false, \ 3925 "Enable dtrace probes for monitor events") \ 3926 \ 3927 product(bool, RelaxAccessControlCheck, false, \ 3928 "Relax the access control checks in the verifier") \ 3929 \ 3930 diagnostic(bool, PrintDTraceDOF, false, \ 3931 "Print the DTrace DOF passed to the system for JSDT probes") \ 3932 \ 3933 product(uintx, StringTableSize, defaultStringTableSize, \ 3934 "Number of buckets in the interned String table") \ 3935 \ 3936 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3937 "Number of buckets in the JVM internal Symbol table") \ 3938 \ 3939 product(bool, UseStringDeduplication, false, \ 3940 "Use string deduplication") \ 3941 \ 3942 product(bool, PrintStringDeduplicationStatistics, false, \ 3943 "Print string deduplication statistics") \ 3944 \ 3945 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3946 "A string must reach this age (or be promoted to an old region) " \ 3947 "to be considered for deduplication") \ 3948 \ 3949 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3950 "Force table resize every time the table is scanned") \ 3951 \ 3952 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3953 "Force table rehash every time the table is scanned") \ 3954 \ 3955 develop(bool, TraceDefaultMethods, false, \ 3956 "Trace the default method processing steps") \ 3957 \ 3958 develop(bool, VerifyGenericSignatures, false, \ 3959 "Abort VM on erroneous or inconsistent generic signatures") \ 3960 \ 3961 product(bool, UseVMInterruptibleIO, false, \ 3962 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3963 "EINTR for I/O operations results in OS_INTRPT. The default " \ 3964 "value of this flag is true for JDK 6 and earlier") \ 3965 \ 3966 diagnostic(bool, WhiteBoxAPI, false, \ 3967 "Enable internal testing APIs") \ 3968 \ 3969 product(bool, PrintGCCause, true, \ 3970 "Include GC cause in GC logging") \ 3971 \ 3972 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3973 "Default survivor space alignment in bytes") \ 3974 \ 3975 product(bool , AllowNonVirtualCalls, false, \ 3976 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3977 \ 3978 product(ccstr, DumpLoadedClassList, NULL, \ 3979 "Dump the names all loaded classes, that could be stored into " \ 3980 "the CDS archive, in the specified file") \ 3981 \ 3982 product(ccstr, SharedClassListFile, NULL, \ 3983 "Override the default CDS class list") \ 3984 \ 3985 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3986 "Override the default location of the CDS archive file") \ 3987 \ 3988 product(ccstr, ExtraSharedClassListFile, NULL, \ 3989 "Extra classlist for building the CDS archive file") \ 3990 \ 3991 experimental(uintx, ArrayAllocatorMallocLimit, \ 3992 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3993 "Allocation less than this value will be allocated " \ 3994 "using malloc. Larger allocations will use mmap.") \ 3995 \ 3996 product(bool, EnableTracing, false, \ 3997 "Enable event-based tracing") \ 3998 \ 3999 product(bool, UseLockedTracing, false, \ 4000 "Use locked-tracing when doing event-based tracing") \ 4001 \ 4002 product_pd(bool, PreserveFramePointer, \ 4003 "Use the FP register for holding the frame pointer " \ 4004 "and not as a general purpose register.") 4005 4006 /* 4007 * Macros for factoring of globals 4008 */ 4009 4010 // Interface macros 4011 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4012 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4013 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4014 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4015 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4016 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4017 #ifdef PRODUCT 4018 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4019 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4020 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4021 #else 4022 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4023 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4024 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4025 #endif 4026 // Special LP64 flags, product only needed for now. 4027 #ifdef _LP64 4028 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4029 #else 4030 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4031 #endif // _LP64 4032 4033 // Implementation macros 4034 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4035 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4036 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4037 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4038 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4039 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4040 #ifdef PRODUCT 4041 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4042 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4043 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4044 #else 4045 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4046 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4047 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4048 #endif 4049 #ifdef _LP64 4050 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4051 #else 4052 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4053 #endif // _LP64 4054 4055 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) 4056 4057 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4058 4059 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4060 4061 // Extensions 4062 4063 #include "runtime/globals_ext.hpp" 4064 4065 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP