1 /* 2 * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26 #define SHARE_VM_RUNTIME_GLOBALS_HPP 27 28 #include "utilities/debug.hpp" 29 30 // use this for flags that are true per default in the tiered build 31 // but false in non-tiered builds, and vice versa 32 #ifdef TIERED 33 #define trueInTiered true 34 #define falseInTiered false 35 #else 36 #define trueInTiered false 37 #define falseInTiered true 38 #endif 39 40 #ifdef TARGET_ARCH_x86 41 # include "globals_x86.hpp" 42 #endif 43 #ifdef TARGET_ARCH_sparc 44 # include "globals_sparc.hpp" 45 #endif 46 #ifdef TARGET_ARCH_zero 47 # include "globals_zero.hpp" 48 #endif 49 #ifdef TARGET_ARCH_arm 50 # include "globals_arm.hpp" 51 #endif 52 #ifdef TARGET_ARCH_ppc 53 # include "globals_ppc.hpp" 54 #endif 55 #ifdef TARGET_OS_FAMILY_linux 56 # include "globals_linux.hpp" 57 #endif 58 #ifdef TARGET_OS_FAMILY_solaris 59 # include "globals_solaris.hpp" 60 #endif 61 #ifdef TARGET_OS_FAMILY_windows 62 # include "globals_windows.hpp" 63 #endif 64 #ifdef TARGET_OS_FAMILY_aix 65 # include "globals_aix.hpp" 66 #endif 67 #ifdef TARGET_OS_FAMILY_bsd 68 # include "globals_bsd.hpp" 69 #endif 70 #ifdef TARGET_OS_ARCH_linux_x86 71 # include "globals_linux_x86.hpp" 72 #endif 73 #ifdef TARGET_OS_ARCH_linux_sparc 74 # include "globals_linux_sparc.hpp" 75 #endif 76 #ifdef TARGET_OS_ARCH_linux_zero 77 # include "globals_linux_zero.hpp" 78 #endif 79 #ifdef TARGET_OS_ARCH_solaris_x86 80 # include "globals_solaris_x86.hpp" 81 #endif 82 #ifdef TARGET_OS_ARCH_solaris_sparc 83 # include "globals_solaris_sparc.hpp" 84 #endif 85 #ifdef TARGET_OS_ARCH_windows_x86 86 # include "globals_windows_x86.hpp" 87 #endif 88 #ifdef TARGET_OS_ARCH_linux_arm 89 # include "globals_linux_arm.hpp" 90 #endif 91 #ifdef TARGET_OS_ARCH_linux_ppc 92 # include "globals_linux_ppc.hpp" 93 #endif 94 #ifdef TARGET_OS_ARCH_aix_ppc 95 # include "globals_aix_ppc.hpp" 96 #endif 97 #ifdef TARGET_OS_ARCH_bsd_x86 98 # include "globals_bsd_x86.hpp" 99 #endif 100 #ifdef TARGET_OS_ARCH_bsd_zero 101 # include "globals_bsd_zero.hpp" 102 #endif 103 #ifdef COMPILER1 104 #ifdef TARGET_ARCH_x86 105 # include "c1_globals_x86.hpp" 106 #endif 107 #ifdef TARGET_ARCH_sparc 108 # include "c1_globals_sparc.hpp" 109 #endif 110 #ifdef TARGET_ARCH_arm 111 # include "c1_globals_arm.hpp" 112 #endif 113 #ifdef TARGET_ARCH_ppc 114 # include "c1_globals_ppc.hpp" 115 #endif 116 #ifdef TARGET_OS_FAMILY_linux 117 # include "c1_globals_linux.hpp" 118 #endif 119 #ifdef TARGET_OS_FAMILY_solaris 120 # include "c1_globals_solaris.hpp" 121 #endif 122 #ifdef TARGET_OS_FAMILY_windows 123 # include "c1_globals_windows.hpp" 124 #endif 125 #ifdef TARGET_OS_FAMILY_aix 126 # include "c1_globals_aix.hpp" 127 #endif 128 #ifdef TARGET_OS_FAMILY_bsd 129 # include "c1_globals_bsd.hpp" 130 #endif 131 #endif 132 #ifdef COMPILER2 133 #ifdef TARGET_ARCH_x86 134 # include "c2_globals_x86.hpp" 135 #endif 136 #ifdef TARGET_ARCH_sparc 137 # include "c2_globals_sparc.hpp" 138 #endif 139 #ifdef TARGET_ARCH_arm 140 # include "c2_globals_arm.hpp" 141 #endif 142 #ifdef TARGET_ARCH_ppc 143 # include "c2_globals_ppc.hpp" 144 #endif 145 #ifdef TARGET_OS_FAMILY_linux 146 # include "c2_globals_linux.hpp" 147 #endif 148 #ifdef TARGET_OS_FAMILY_solaris 149 # include "c2_globals_solaris.hpp" 150 #endif 151 #ifdef TARGET_OS_FAMILY_windows 152 # include "c2_globals_windows.hpp" 153 #endif 154 #ifdef TARGET_OS_FAMILY_aix 155 # include "c2_globals_aix.hpp" 156 #endif 157 #ifdef TARGET_OS_FAMILY_bsd 158 # include "c2_globals_bsd.hpp" 159 #endif 160 #endif 161 #ifdef SHARK 162 #ifdef TARGET_ARCH_zero 163 # include "shark_globals_zero.hpp" 164 #endif 165 #endif 166 167 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 168 define_pd_global(bool, BackgroundCompilation, false); 169 define_pd_global(bool, UseTLAB, false); 170 define_pd_global(bool, CICompileOSR, false); 171 define_pd_global(bool, UseTypeProfile, false); 172 define_pd_global(bool, UseOnStackReplacement, false); 173 define_pd_global(bool, InlineIntrinsics, false); 174 define_pd_global(bool, PreferInterpreterNativeStubs, true); 175 define_pd_global(bool, ProfileInterpreter, false); 176 define_pd_global(bool, ProfileTraps, false); 177 define_pd_global(bool, TieredCompilation, false); 178 179 define_pd_global(intx, CompileThreshold, 0); 180 define_pd_global(intx, BackEdgeThreshold, 0); 181 182 define_pd_global(intx, OnStackReplacePercentage, 0); 183 define_pd_global(bool, ResizeTLAB, false); 184 define_pd_global(intx, FreqInlineSize, 0); 185 define_pd_global(intx, NewSizeThreadIncrease, 4*K); 186 define_pd_global(intx, InlineClassNatives, true); 187 define_pd_global(intx, InlineUnsafeOps, true); 188 define_pd_global(intx, InitialCodeCacheSize, 160*K); 189 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 190 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 191 define_pd_global(intx, CodeCacheMinBlockLength, 1); 192 define_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 193 define_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 194 define_pd_global(bool, NeverActAsServerClassMachine, true); 195 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 196 #define CI_COMPILER_COUNT 0 197 #else 198 199 #ifdef COMPILER2 200 #define CI_COMPILER_COUNT 2 201 #else 202 #define CI_COMPILER_COUNT 1 203 #endif // COMPILER2 204 205 #endif // no compilers 206 207 #if !INCLUDE_JFR 208 #define LogJFR false 209 #endif 210 211 // string type aliases used only in this file 212 typedef const char* ccstr; 213 typedef const char* ccstrlist; // represents string arguments which accumulate 214 215 struct Flag { 216 enum Flags { 217 // value origin 218 DEFAULT = 0, 219 COMMAND_LINE = 1, 220 ENVIRON_VAR = 2, 221 CONFIG_FILE = 3, 222 MANAGEMENT = 4, 223 ERGONOMIC = 5, 224 ATTACH_ON_DEMAND = 6, 225 INTERNAL = 7, 226 227 LAST_VALUE_ORIGIN = INTERNAL, 228 VALUE_ORIGIN_BITS = 4, 229 VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 230 231 // flag kind 232 KIND_PRODUCT = 1 << 4, 233 KIND_MANAGEABLE = 1 << 5, 234 KIND_DIAGNOSTIC = 1 << 6, 235 KIND_EXPERIMENTAL = 1 << 7, 236 KIND_NOT_PRODUCT = 1 << 8, 237 KIND_DEVELOP = 1 << 9, 238 KIND_PLATFORM_DEPENDENT = 1 << 10, 239 KIND_READ_WRITE = 1 << 11, 240 KIND_C1 = 1 << 12, 241 KIND_C2 = 1 << 13, 242 KIND_ARCH = 1 << 14, 243 KIND_SHARK = 1 << 15, 244 KIND_LP64_PRODUCT = 1 << 16, 245 KIND_COMMERCIAL = 1 << 17, 246 247 KIND_MASK = ~VALUE_ORIGIN_MASK 248 }; 249 250 const char* _type; 251 const char* _name; 252 void* _addr; 253 NOT_PRODUCT(const char* _doc;) 254 Flags _flags; 255 256 // points to all Flags static array 257 static Flag* flags; 258 259 // number of flags 260 static size_t numFlags; 261 262 static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 263 static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 264 265 void check_writable(); 266 267 bool is_bool() const; 268 bool get_bool() const; 269 void set_bool(bool value); 270 271 bool is_intx() const; 272 intx get_intx() const; 273 void set_intx(intx value); 274 275 bool is_uintx() const; 276 uintx get_uintx() const; 277 void set_uintx(uintx value); 278 279 bool is_uint64_t() const; 280 uint64_t get_uint64_t() const; 281 void set_uint64_t(uint64_t value); 282 283 bool is_double() const; 284 double get_double() const; 285 void set_double(double value); 286 287 bool is_ccstr() const; 288 bool ccstr_accumulates() const; 289 ccstr get_ccstr() const; 290 void set_ccstr(ccstr value); 291 292 Flags get_origin(); 293 void set_origin(Flags origin); 294 295 bool is_default(); 296 bool is_ergonomic(); 297 bool is_command_line(); 298 299 bool is_product() const; 300 bool is_manageable() const; 301 bool is_diagnostic() const; 302 bool is_experimental() const; 303 bool is_notproduct() const; 304 bool is_develop() const; 305 bool is_read_write() const; 306 bool is_commercial() const; 307 308 bool is_constant_in_binary() const; 309 310 bool is_unlocker() const; 311 bool is_unlocked() const; 312 bool is_writeable() const; 313 bool is_external() const; 314 315 bool is_unlocker_ext() const; 316 bool is_unlocked_ext() const; 317 bool is_writeable_ext() const; 318 bool is_external_ext() const; 319 320 void unlock_diagnostic(); 321 322 void get_locked_message(char*, int) const; 323 void get_locked_message_ext(char*, int) const; 324 325 void print_on(outputStream* st, bool withComments = false ); 326 void print_kind(outputStream* st); 327 void print_as_flag(outputStream* st); 328 }; 329 330 // debug flags control various aspects of the VM and are global accessible 331 332 // use FlagSetting to temporarily change some debug flag 333 // e.g. FlagSetting fs(DebugThisAndThat, true); 334 // restored to previous value upon leaving scope 335 class FlagSetting { 336 bool val; 337 bool* flag; 338 public: 339 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 340 ~FlagSetting() { *flag = val; } 341 }; 342 343 344 class CounterSetting { 345 intx* counter; 346 public: 347 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 348 ~CounterSetting() { (*counter)--; } 349 }; 350 351 352 class UIntFlagSetting { 353 uintx val; 354 uintx* flag; 355 public: 356 UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 357 ~UIntFlagSetting() { *flag = val; } 358 }; 359 360 361 class DoubleFlagSetting { 362 double val; 363 double* flag; 364 public: 365 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 366 ~DoubleFlagSetting() { *flag = val; } 367 }; 368 369 370 class CommandLineFlags { 371 public: 372 static bool boolAt(const char* name, size_t len, bool* value, bool allow_locked = false, bool return_flag = false); 373 static bool boolAt(const char* name, bool* value, bool allow_locked = false, bool return_flag = false) { return boolAt(name, strlen(name), value, allow_locked, return_flag); } 374 static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 375 static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 376 377 static bool intxAt(const char* name, size_t len, intx* value, bool allow_locked = false, bool return_flag = false); 378 static bool intxAt(const char* name, intx* value, bool allow_locked = false, bool return_flag = false) { return intxAt(name, strlen(name), value, allow_locked, return_flag); } 379 static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 380 static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 381 382 static bool uintxAt(const char* name, size_t len, uintx* value, bool allow_locked = false, bool return_flag = false); 383 static bool uintxAt(const char* name, uintx* value, bool allow_locked = false, bool return_flag = false) { return uintxAt(name, strlen(name), value, allow_locked, return_flag); } 384 static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 385 static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 386 387 static bool uint64_tAt(const char* name, size_t len, uint64_t* value, bool allow_locked = false, bool return_flag = false); 388 static bool uint64_tAt(const char* name, uint64_t* value, bool allow_locked = false, bool return_flag = false) { return uint64_tAt(name, strlen(name), value, allow_locked, return_flag); } 389 static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 390 static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 391 392 static bool doubleAt(const char* name, size_t len, double* value, bool allow_locked = false, bool return_flag = false); 393 static bool doubleAt(const char* name, double* value, bool allow_locked = false, bool return_flag = false) { return doubleAt(name, strlen(name), value, allow_locked, return_flag); } 394 static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 395 static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 396 397 static bool ccstrAt(const char* name, size_t len, ccstr* value, bool allow_locked = false, bool return_flag = false); 398 static bool ccstrAt(const char* name, ccstr* value, bool allow_locked = false, bool return_flag = false) { return ccstrAt(name, strlen(name), value, allow_locked, return_flag); } 399 // Contract: Flag will make private copy of the incoming value. 400 // Outgoing value is always malloc-ed, and caller MUST call free. 401 static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 402 static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 403 404 // Returns false if name is not a command line flag. 405 static bool wasSetOnCmdline(const char* name, bool* value); 406 static void printSetFlags(outputStream* out); 407 408 static void printFlags(outputStream* out, bool withComments); 409 410 static void verify() PRODUCT_RETURN; 411 }; 412 413 // use this for flags that are true by default in the debug version but 414 // false in the optimized version, and vice versa 415 #ifdef ASSERT 416 #define trueInDebug true 417 #define falseInDebug false 418 #else 419 #define trueInDebug false 420 #define falseInDebug true 421 #endif 422 423 // use this for flags that are true per default in the product build 424 // but false in development builds, and vice versa 425 #ifdef PRODUCT 426 #define trueInProduct true 427 #define falseInProduct false 428 #else 429 #define trueInProduct false 430 #define falseInProduct true 431 #endif 432 433 #ifdef JAVASE_EMBEDDED 434 #define falseInEmbedded false 435 #else 436 #define falseInEmbedded true 437 #endif 438 439 // develop flags are settable / visible only during development and are constant in the PRODUCT version 440 // product flags are always settable / visible 441 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 442 443 // A flag must be declared with one of the following types: 444 // bool, intx, uintx, ccstr. 445 // The type "ccstr" is an alias for "const char*" and is used 446 // only in this file, because the macrology requires single-token type names. 447 448 // Note: Diagnostic options not meant for VM tuning or for product modes. 449 // They are to be used for VM quality assurance or field diagnosis 450 // of VM bugs. They are hidden so that users will not be encouraged to 451 // try them as if they were VM ordinary execution options. However, they 452 // are available in the product version of the VM. Under instruction 453 // from support engineers, VM customers can turn them on to collect 454 // diagnostic information about VM problems. To use a VM diagnostic 455 // option, you must first specify +UnlockDiagnosticVMOptions. 456 // (This master switch also affects the behavior of -Xprintflags.) 457 // 458 // experimental flags are in support of features that are not 459 // part of the officially supported product, but are available 460 // for experimenting with. They could, for example, be performance 461 // features that may not have undergone full or rigorous QA, but which may 462 // help performance in some cases and released for experimentation 463 // by the community of users and developers. This flag also allows one to 464 // be able to build a fully supported product that nonetheless also 465 // ships with some unsupported, lightly tested, experimental features. 466 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 467 // UnlockExperimentalVMOptions flag, which allows the control and 468 // modification of the experimental flags. 469 // 470 // Nota bene: neither diagnostic nor experimental options should be used casually, 471 // and they are not supported on production loads, except under explicit 472 // direction from support engineers. 473 // 474 // manageable flags are writeable external product flags. 475 // They are dynamically writeable through the JDK management interface 476 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 477 // These flags are external exported interface (see CCC). The list of 478 // manageable flags can be queried programmatically through the management 479 // interface. 480 // 481 // A flag can be made as "manageable" only if 482 // - the flag is defined in a CCC as an external exported interface. 483 // - the VM implementation supports dynamic setting of the flag. 484 // This implies that the VM must *always* query the flag variable 485 // and not reuse state related to the flag state at any given time. 486 // - you want the flag to be queried programmatically by the customers. 487 // 488 // product_rw flags are writeable internal product flags. 489 // They are like "manageable" flags but for internal/private use. 490 // The list of product_rw flags are internal/private flags which 491 // may be changed/removed in a future release. It can be set 492 // through the management interface to get/set value 493 // when the name of flag is supplied. 494 // 495 // A flag can be made as "product_rw" only if 496 // - the VM implementation supports dynamic setting of the flag. 497 // This implies that the VM must *always* query the flag variable 498 // and not reuse state related to the flag state at any given time. 499 // 500 // Note that when there is a need to support develop flags to be writeable, 501 // it can be done in the same way as product_rw. 502 503 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 504 \ 505 lp64_product(bool, UseCompressedOops, false, \ 506 "Use 32-bit object references in 64-bit VM. " \ 507 "lp64_product means flag is always constant in 32 bit VM") \ 508 \ 509 lp64_product(bool, UseCompressedClassPointers, false, \ 510 "Use 32-bit class pointers in 64-bit VM. " \ 511 "lp64_product means flag is always constant in 32 bit VM") \ 512 \ 513 notproduct(bool, CheckCompressedOops, true, \ 514 "Generate checks in encoding/decoding code in debug VM") \ 515 \ 516 product_pd(uintx, HeapBaseMinAddress, \ 517 "OS specific low limit for heap base address") \ 518 \ 519 diagnostic(bool, PrintCompressedOopsMode, false, \ 520 "Print compressed oops base address and encoding mode") \ 521 \ 522 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 523 "Default object alignment in bytes, 8 is minimum") \ 524 \ 525 product(bool, AssumeMP, false, \ 526 "Instruct the VM to assume multiple processors are available") \ 527 \ 528 /* UseMembar is theoretically a temp flag used for memory barrier \ 529 * removal testing. It was supposed to be removed before FCS but has \ 530 * been re-added (see 6401008) */ \ 531 product_pd(bool, UseMembar, \ 532 "(Unstable) Issues membars on thread state transitions") \ 533 \ 534 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 535 "Clean the chunk pool asynchronously") \ 536 \ 537 /* Temporary: See 6948537 */ \ 538 experimental(bool, UseMemSetInBOT, true, \ 539 "(Unstable) uses memset in BOT updates in GC code") \ 540 \ 541 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 542 "Enable normal processing of flags relating to field diagnostics")\ 543 \ 544 experimental(bool, UnlockExperimentalVMOptions, false, \ 545 "Enable normal processing of flags relating to experimental " \ 546 "features") \ 547 \ 548 product(bool, JavaMonitorsInStackTrace, true, \ 549 "Print information about Java monitor locks when the stacks are" \ 550 "dumped") \ 551 \ 552 product_pd(bool, UseLargePages, \ 553 "Use large page memory") \ 554 \ 555 product_pd(bool, UseLargePagesIndividualAllocation, \ 556 "Allocate large pages individually for better affinity") \ 557 \ 558 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 559 "Fail large pages individual allocation") \ 560 \ 561 product(bool, UseLargePagesInMetaspace, false, \ 562 "Use large page memory in metaspace. " \ 563 "Only used if UseLargePages is enabled.") \ 564 \ 565 develop(bool, TracePageSizes, false, \ 566 "Trace page size selection and usage") \ 567 \ 568 product(bool, UseNUMA, false, \ 569 "Use NUMA if available") \ 570 \ 571 product(bool, UseNUMAInterleaving, false, \ 572 "Interleave memory across NUMA nodes if available") \ 573 \ 574 product(uintx, NUMAInterleaveGranularity, 2*M, \ 575 "Granularity to use for NUMA interleaving on Windows OS") \ 576 \ 577 product(bool, ForceNUMA, false, \ 578 "Force NUMA optimizations on single-node/UMA systems") \ 579 \ 580 product(uintx, NUMAChunkResizeWeight, 20, \ 581 "Percentage (0-100) used to weigh the current sample when " \ 582 "computing exponentially decaying average for " \ 583 "AdaptiveNUMAChunkSizing") \ 584 \ 585 product(uintx, NUMASpaceResizeRate, 1*G, \ 586 "Do not reallocate more than this amount per collection") \ 587 \ 588 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 589 "Enable adaptive chunk sizing for NUMA") \ 590 \ 591 product(bool, NUMAStats, false, \ 592 "Print NUMA stats in detailed heap information") \ 593 \ 594 product(uintx, NUMAPageScanRate, 256, \ 595 "Maximum number of pages to include in the page scan procedure") \ 596 \ 597 product_pd(bool, NeedsDeoptSuspend, \ 598 "True for register window machines (sparc/ia64)") \ 599 \ 600 product(intx, UseSSE, 99, \ 601 "Highest supported SSE instructions set on x86/x64") \ 602 \ 603 product(bool, UseAES, false, \ 604 "Control whether AES instructions can be used on x86/x64") \ 605 \ 606 product(bool, UseSHA, false, \ 607 "Control whether SHA instructions can be used on SPARC") \ 608 \ 609 product(uintx, LargePageSizeInBytes, 0, \ 610 "Large page size (0 to let VM choose the page size)") \ 611 \ 612 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 613 "Use large pages if maximum heap is at least this big") \ 614 \ 615 product(bool, ForceTimeHighResolution, false, \ 616 "Using high time resolution (for Win32 only)") \ 617 \ 618 develop(bool, TraceItables, false, \ 619 "Trace initialization and use of itables") \ 620 \ 621 develop(bool, TracePcPatching, false, \ 622 "Trace usage of frame::patch_pc") \ 623 \ 624 develop(bool, TraceJumps, false, \ 625 "Trace assembly jumps in thread ring buffer") \ 626 \ 627 develop(bool, TraceRelocator, false, \ 628 "Trace the bytecode relocator") \ 629 \ 630 develop(bool, TraceLongCompiles, false, \ 631 "Print out every time compilation is longer than " \ 632 "a given threshold") \ 633 \ 634 develop(bool, SafepointALot, false, \ 635 "Generate a lot of safepoints. This works with " \ 636 "GuaranteedSafepointInterval") \ 637 \ 638 product_pd(bool, BackgroundCompilation, \ 639 "A thread requesting compilation is not blocked during " \ 640 "compilation") \ 641 \ 642 product(bool, PrintVMQWaitTime, false, \ 643 "Print out the waiting time in VM operation queue") \ 644 \ 645 develop(bool, NoYieldsInMicrolock, false, \ 646 "Disable yields in microlock") \ 647 \ 648 develop(bool, TraceOopMapGeneration, false, \ 649 "Show OopMapGeneration") \ 650 \ 651 product(bool, MethodFlushing, true, \ 652 "Reclamation of zombie and not-entrant methods") \ 653 \ 654 develop(bool, VerifyStack, false, \ 655 "Verify stack of each thread when it is entering a runtime call") \ 656 \ 657 diagnostic(bool, ForceUnreachable, false, \ 658 "Make all non code cache addresses to be unreachable by " \ 659 "forcing use of 64bit literal fixups") \ 660 \ 661 notproduct(bool, StressDerivedPointers, false, \ 662 "Force scavenge when a derived pointer is detected on stack " \ 663 "after rtm call") \ 664 \ 665 develop(bool, TraceDerivedPointers, false, \ 666 "Trace traversal of derived pointers on stack") \ 667 \ 668 notproduct(bool, TraceCodeBlobStacks, false, \ 669 "Trace stack-walk of codeblobs") \ 670 \ 671 product(bool, PrintJNIResolving, false, \ 672 "Used to implement -v:jni") \ 673 \ 674 notproduct(bool, PrintRewrites, false, \ 675 "Print methods that are being rewritten") \ 676 \ 677 product(bool, UseInlineCaches, true, \ 678 "Use Inline Caches for virtual calls ") \ 679 \ 680 develop(bool, InlineArrayCopy, true, \ 681 "Inline arraycopy native that is known to be part of " \ 682 "base library DLL") \ 683 \ 684 develop(bool, InlineObjectHash, true, \ 685 "Inline Object::hashCode() native that is known to be part " \ 686 "of base library DLL") \ 687 \ 688 develop(bool, InlineNatives, true, \ 689 "Inline natives that are known to be part of base library DLL") \ 690 \ 691 develop(bool, InlineMathNatives, true, \ 692 "Inline SinD, CosD, etc.") \ 693 \ 694 develop(bool, InlineClassNatives, true, \ 695 "Inline Class.isInstance, etc") \ 696 \ 697 develop(bool, InlineThreadNatives, true, \ 698 "Inline Thread.currentThread, etc") \ 699 \ 700 develop(bool, InlineUnsafeOps, true, \ 701 "Inline memory ops (native methods) from sun.misc.Unsafe") \ 702 \ 703 product(bool, CriticalJNINatives, true, \ 704 "Check for critical JNI entry points") \ 705 \ 706 notproduct(bool, StressCriticalJNINatives, false, \ 707 "Exercise register saving code in critical natives") \ 708 \ 709 product(bool, UseSSE42Intrinsics, false, \ 710 "SSE4.2 versions of intrinsics") \ 711 \ 712 product(bool, UseAESIntrinsics, false, \ 713 "Use intrinsics for AES versions of crypto") \ 714 \ 715 product(bool, UseSHA1Intrinsics, false, \ 716 "Use intrinsics for SHA-1 crypto hash function") \ 717 \ 718 product(bool, UseSHA256Intrinsics, false, \ 719 "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 720 \ 721 product(bool, UseSHA512Intrinsics, false, \ 722 "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 723 \ 724 product(bool, UseCRC32Intrinsics, false, \ 725 "use intrinsics for java.util.zip.CRC32") \ 726 \ 727 develop(bool, TraceCallFixup, false, \ 728 "Trace all call fixups") \ 729 \ 730 develop(bool, DeoptimizeALot, false, \ 731 "Deoptimize at every exit from the runtime system") \ 732 \ 733 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 734 "A comma separated list of bcis to deoptimize at") \ 735 \ 736 product(bool, DeoptimizeRandom, false, \ 737 "Deoptimize random frames on random exit from the runtime system")\ 738 \ 739 notproduct(bool, ZombieALot, false, \ 740 "Create zombies (non-entrant) at exit from the runtime system") \ 741 \ 742 product(bool, UnlinkSymbolsALot, false, \ 743 "Unlink unreferenced symbols from the symbol table at safepoints")\ 744 \ 745 notproduct(bool, WalkStackALot, false, \ 746 "Trace stack (no print) at every exit from the runtime system") \ 747 \ 748 product(bool, Debugging, false, \ 749 "Set when executing debug methods in debug.cpp " \ 750 "(to prevent triggering assertions)") \ 751 \ 752 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 753 "Enable strict checks that safepoints cannot happen for threads " \ 754 "that use No_Safepoint_Verifier") \ 755 \ 756 notproduct(bool, VerifyLastFrame, false, \ 757 "Verify oops on last frame on entry to VM") \ 758 \ 759 develop(bool, TraceHandleAllocation, false, \ 760 "Print out warnings when suspiciously many handles are allocated")\ 761 \ 762 product(bool, UseCompilerSafepoints, true, \ 763 "Stop at safepoints in compiled code") \ 764 \ 765 product(bool, FailOverToOldVerifier, true, \ 766 "Fail over to old verifier when split verifier fails") \ 767 \ 768 develop(bool, ShowSafepointMsgs, false, \ 769 "Show message about safepoint synchronization") \ 770 \ 771 product(bool, SafepointTimeout, false, \ 772 "Time out and warn or fail after SafepointTimeoutDelay " \ 773 "milliseconds if failed to reach safepoint") \ 774 \ 775 develop(bool, DieOnSafepointTimeout, false, \ 776 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 777 \ 778 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 779 /* typically, at most a few retries are needed */ \ 780 product(intx, SuspendRetryCount, 50, \ 781 "Maximum retry count for an external suspend request") \ 782 \ 783 product(intx, SuspendRetryDelay, 5, \ 784 "Milliseconds to delay per retry (* current_retry_count)") \ 785 \ 786 product(bool, AssertOnSuspendWaitFailure, false, \ 787 "Assert/Guarantee on external suspend wait failure") \ 788 \ 789 product(bool, TraceSuspendWaitFailures, false, \ 790 "Trace external suspend wait failures") \ 791 \ 792 product(bool, MaxFDLimit, true, \ 793 "Bump the number of file descriptors to maximum in Solaris") \ 794 \ 795 diagnostic(bool, LogEvents, true, \ 796 "Enable the various ring buffer event logs") \ 797 \ 798 diagnostic(uintx, LogEventsBufferEntries, 10, \ 799 "Number of ring buffer event logs") \ 800 \ 801 product(bool, BytecodeVerificationRemote, true, \ 802 "Enable the Java bytecode verifier for remote classes") \ 803 \ 804 product(bool, BytecodeVerificationLocal, false, \ 805 "Enable the Java bytecode verifier for local classes") \ 806 \ 807 develop(bool, ForceFloatExceptions, trueInDebug, \ 808 "Force exceptions on FP stack under/overflow") \ 809 \ 810 develop(bool, VerifyStackAtCalls, false, \ 811 "Verify that the stack pointer is unchanged after calls") \ 812 \ 813 develop(bool, TraceJavaAssertions, false, \ 814 "Trace java language assertions") \ 815 \ 816 notproduct(bool, CheckAssertionStatusDirectives, false, \ 817 "Temporary - see javaClasses.cpp") \ 818 \ 819 notproduct(bool, PrintMallocFree, false, \ 820 "Trace calls to C heap malloc/free allocation") \ 821 \ 822 product(bool, PrintOopAddress, false, \ 823 "Always print the location of the oop") \ 824 \ 825 notproduct(bool, VerifyCodeCacheOften, false, \ 826 "Verify compiled-code cache often") \ 827 \ 828 develop(bool, ZapDeadCompiledLocals, false, \ 829 "Zap dead locals in compiler frames") \ 830 \ 831 notproduct(bool, ZapDeadLocalsOld, false, \ 832 "Zap dead locals (old version, zaps all frames when " \ 833 "entering the VM") \ 834 \ 835 notproduct(bool, CheckOopishValues, false, \ 836 "Warn if value contains oop (requires ZapDeadLocals)") \ 837 \ 838 develop(bool, UseMallocOnly, false, \ 839 "Use only malloc/free for allocation (no resource area/arena)") \ 840 \ 841 develop(bool, PrintMalloc, false, \ 842 "Print all malloc/free calls") \ 843 \ 844 develop(bool, PrintMallocStatistics, false, \ 845 "Print malloc/free statistics") \ 846 \ 847 develop(bool, ZapResourceArea, trueInDebug, \ 848 "Zap freed resource/arena space with 0xABABABAB") \ 849 \ 850 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 851 "Zap freed VM handle space with 0xBCBCBCBC") \ 852 \ 853 develop(bool, ZapJNIHandleArea, trueInDebug, \ 854 "Zap freed JNI handle space with 0xFEFEFEFE") \ 855 \ 856 notproduct(bool, ZapStackSegments, trueInDebug, \ 857 "Zap allocated/freed stack segments with 0xFADFADED") \ 858 \ 859 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 860 "Zap unused heap space with 0xBAADBABE") \ 861 \ 862 develop(bool, TraceZapUnusedHeapArea, false, \ 863 "Trace zapping of unused heap space") \ 864 \ 865 develop(bool, CheckZapUnusedHeapArea, false, \ 866 "Check zapping of unused heap space") \ 867 \ 868 develop(bool, ZapFillerObjects, trueInDebug, \ 869 "Zap filler objects with 0xDEAFBABE") \ 870 \ 871 develop(bool, PrintVMMessages, true, \ 872 "Print VM messages on console") \ 873 \ 874 product(bool, PrintGCApplicationConcurrentTime, false, \ 875 "Print the time the application has been running") \ 876 \ 877 product(bool, PrintGCApplicationStoppedTime, false, \ 878 "Print the time the application has been stopped") \ 879 \ 880 diagnostic(bool, VerboseVerification, false, \ 881 "Display detailed verification details") \ 882 \ 883 notproduct(uintx, ErrorHandlerTest, 0, \ 884 "If > 0, provokes an error after VM initialization; the value " \ 885 "determines which error to provoke. See test_error_handler() " \ 886 "in debug.cpp.") \ 887 \ 888 develop(bool, Verbose, false, \ 889 "Print additional debugging information from other modes") \ 890 \ 891 develop(bool, PrintMiscellaneous, false, \ 892 "Print uncategorized debugging information (requires +Verbose)") \ 893 \ 894 develop(bool, WizardMode, false, \ 895 "Print much more debugging information") \ 896 \ 897 product(bool, ShowMessageBoxOnError, false, \ 898 "Keep process alive on VM fatal error") \ 899 \ 900 product(bool, CreateMinidumpOnCrash, false, \ 901 "Create minidump on VM fatal error") \ 902 \ 903 product_pd(bool, UseOSErrorReporting, \ 904 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 905 \ 906 product(bool, SuppressFatalErrorMessage, false, \ 907 "Report NO fatal error message (avoid deadlock)") \ 908 \ 909 product(ccstrlist, OnError, "", \ 910 "Run user-defined commands on fatal error; see VMError.cpp " \ 911 "for examples") \ 912 \ 913 product(ccstrlist, OnOutOfMemoryError, "", \ 914 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 915 \ 916 manageable(bool, HeapDumpBeforeFullGC, false, \ 917 "Dump heap to file before any major stop-the-world GC") \ 918 \ 919 manageable(bool, HeapDumpAfterFullGC, false, \ 920 "Dump heap to file after any major stop-the-world GC") \ 921 \ 922 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 923 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 924 \ 925 manageable(ccstr, HeapDumpPath, NULL, \ 926 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 927 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 928 "in the working directory)") \ 929 \ 930 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 931 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 932 "when the heap usage is larger than this") \ 933 \ 934 develop(uintx, HeapDumpSegmentSize, 1*G, \ 935 "Approximate segment size when generating a segmented heap dump") \ 936 \ 937 develop(bool, BreakAtWarning, false, \ 938 "Execute breakpoint upon encountering VM warning") \ 939 \ 940 develop(bool, TraceVMOperation, false, \ 941 "Trace VM operations") \ 942 \ 943 develop(bool, UseFakeTimers, false, \ 944 "Tell whether the VM should use system time or a fake timer") \ 945 \ 946 product(ccstr, NativeMemoryTracking, "off", \ 947 "Native memory tracking options") \ 948 \ 949 diagnostic(bool, PrintNMTStatistics, false, \ 950 "Print native memory tracking summary data if it is on") \ 951 \ 952 diagnostic(bool, LogCompilation, false, \ 953 "Log compilation activity in detail to LogFile") \ 954 \ 955 product(bool, PrintCompilation, false, \ 956 "Print compilations") \ 957 \ 958 diagnostic(bool, TraceNMethodInstalls, false, \ 959 "Trace nmethod installation") \ 960 \ 961 diagnostic(intx, ScavengeRootsInCode, 2, \ 962 "0: do not allow scavengable oops in the code cache; " \ 963 "1: allow scavenging from the code cache; " \ 964 "2: emit as many constants as the compiler can see") \ 965 \ 966 product(bool, AlwaysRestoreFPU, false, \ 967 "Restore the FPU control word after every JNI call (expensive)") \ 968 \ 969 diagnostic(bool, PrintCompilation2, false, \ 970 "Print additional statistics per compilation") \ 971 \ 972 diagnostic(bool, PrintAdapterHandlers, false, \ 973 "Print code generated for i2c/c2i adapters") \ 974 \ 975 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 976 "Verify that i2c/c2i adapters are called properly") \ 977 \ 978 develop(bool, VerifyAdapterSharing, false, \ 979 "Verify that the code for shared adapters is the equivalent") \ 980 \ 981 diagnostic(bool, PrintAssembly, false, \ 982 "Print assembly code (using external disassembler.so)") \ 983 \ 984 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 985 "Print options string passed to disassembler.so") \ 986 \ 987 diagnostic(bool, PrintNMethods, false, \ 988 "Print assembly code for nmethods when generated") \ 989 \ 990 diagnostic(bool, PrintNativeNMethods, false, \ 991 "Print assembly code for native nmethods when generated") \ 992 \ 993 develop(bool, PrintDebugInfo, false, \ 994 "Print debug information for all nmethods when generated") \ 995 \ 996 develop(bool, PrintRelocations, false, \ 997 "Print relocation information for all nmethods when generated") \ 998 \ 999 develop(bool, PrintDependencies, false, \ 1000 "Print dependency information for all nmethods when generated") \ 1001 \ 1002 develop(bool, PrintExceptionHandlers, false, \ 1003 "Print exception handler tables for all nmethods when generated") \ 1004 \ 1005 develop(bool, StressCompiledExceptionHandlers, false, \ 1006 "Exercise compiled exception handlers") \ 1007 \ 1008 develop(bool, InterceptOSException, false, \ 1009 "Start debugger when an implicit OS (e.g. NULL) " \ 1010 "exception happens") \ 1011 \ 1012 product(bool, PrintCodeCache, false, \ 1013 "Print the code cache memory usage when exiting") \ 1014 \ 1015 develop(bool, PrintCodeCache2, false, \ 1016 "Print detailed usage information on the code cache when exiting")\ 1017 \ 1018 product(bool, PrintCodeCacheOnCompilation, false, \ 1019 "Print the code cache memory usage each time a method is " \ 1020 "compiled") \ 1021 \ 1022 diagnostic(bool, PrintStubCode, false, \ 1023 "Print generated stub code") \ 1024 \ 1025 product(bool, StackTraceInThrowable, true, \ 1026 "Collect backtrace in throwable when exception happens") \ 1027 \ 1028 product(bool, OmitStackTraceInFastThrow, true, \ 1029 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1030 \ 1031 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1032 "Print bytecode statistics when dumping profiler output") \ 1033 \ 1034 product(bool, ProfilerRecordPC, false, \ 1035 "Collect ticks for each 16 byte interval of compiled code") \ 1036 \ 1037 product(bool, ProfileVM, false, \ 1038 "Profile ticks that fall within VM (either in the VM Thread " \ 1039 "or VM code called through stubs)") \ 1040 \ 1041 product(bool, ProfileIntervals, false, \ 1042 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1043 \ 1044 notproduct(bool, ProfilerCheckIntervals, false, \ 1045 "Collect and print information on spacing of profiler ticks") \ 1046 \ 1047 develop(bool, PrintJVMWarnings, false, \ 1048 "Print warnings for unimplemented JVM functions") \ 1049 \ 1050 product(bool, PrintWarnings, true, \ 1051 "Print JVM warnings to output stream") \ 1052 \ 1053 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1054 "Print warnings for stalled SpinLocks") \ 1055 \ 1056 product(bool, RegisterFinalizersAtInit, true, \ 1057 "Register finalizable objects at end of Object.<init> or " \ 1058 "after allocation") \ 1059 \ 1060 develop(bool, RegisterReferences, true, \ 1061 "Tell whether the VM should register soft/weak/final/phantom " \ 1062 "references") \ 1063 \ 1064 develop(bool, IgnoreRewrites, false, \ 1065 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1066 "This is unsafe!") \ 1067 \ 1068 develop(bool, PrintCodeCacheExtension, false, \ 1069 "Print extension of code cache") \ 1070 \ 1071 develop(bool, UsePrivilegedStack, true, \ 1072 "Enable the security JVM functions") \ 1073 \ 1074 develop(bool, ProtectionDomainVerification, true, \ 1075 "Verify protection domain before resolution in system dictionary")\ 1076 \ 1077 product(bool, ClassUnloading, true, \ 1078 "Do unloading of classes") \ 1079 \ 1080 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1081 "Do unloading of classes with a concurrent marking cycle") \ 1082 \ 1083 develop(bool, DisableStartThread, false, \ 1084 "Disable starting of additional Java threads " \ 1085 "(for debugging only)") \ 1086 \ 1087 develop(bool, MemProfiling, false, \ 1088 "Write memory usage profiling to log file") \ 1089 \ 1090 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1091 "Print the system dictionary at exit") \ 1092 \ 1093 experimental(intx, PredictedLoadedClassCount, 0, \ 1094 "Experimental: Tune loaded class cache starting size") \ 1095 \ 1096 diagnostic(bool, UnsyncloadClass, false, \ 1097 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1098 "class loader must call VM synchronized for findClass " \ 1099 "and defineClass.") \ 1100 \ 1101 product(bool, AlwaysLockClassLoader, false, \ 1102 "Require the VM to acquire the class loader lock before calling " \ 1103 "loadClass() even for class loaders registering " \ 1104 "as parallel capable") \ 1105 \ 1106 product(bool, AllowParallelDefineClass, false, \ 1107 "Allow parallel defineClass requests for class loaders " \ 1108 "registering as parallel capable") \ 1109 \ 1110 product(bool, MustCallLoadClassInternal, false, \ 1111 "Call loadClassInternal() rather than loadClass()") \ 1112 \ 1113 product_pd(bool, DontYieldALot, \ 1114 "Throw away obvious excess yield calls (for Solaris only)") \ 1115 \ 1116 product_pd(bool, ConvertSleepToYield, \ 1117 "Convert sleep(0) to thread yield " \ 1118 "(may be off for Solaris to improve GUI)") \ 1119 \ 1120 product(bool, ConvertYieldToSleep, false, \ 1121 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1122 "behavior (Solaris only)") \ 1123 \ 1124 product(bool, UseBoundThreads, true, \ 1125 "Bind user level threads to kernel threads (for Solaris only)") \ 1126 \ 1127 develop(bool, UseDetachedThreads, true, \ 1128 "Use detached threads that are recycled upon termination " \ 1129 "(for Solaris only)") \ 1130 \ 1131 experimental(bool, DisablePrimordialThreadGuardPages, false, \ 1132 "Disable the use of stack guard pages if the JVM is loaded " \ 1133 "on the primordial process thread") \ 1134 \ 1135 product(bool, UseLWPSynchronization, true, \ 1136 "Use LWP-based instead of libthread-based synchronization " \ 1137 "(SPARC only)") \ 1138 \ 1139 product(ccstr, SyncKnobs, NULL, \ 1140 "(Unstable) Various monitor synchronization tunables") \ 1141 \ 1142 product(intx, EmitSync, 0, \ 1143 "(Unsafe, Unstable) " \ 1144 "Control emission of inline sync fast-path code") \ 1145 \ 1146 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1147 \ 1148 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1149 \ 1150 product(intx, SyncFlags, 0, "(Unsafe, Unstable) Experimental Sync flags") \ 1151 \ 1152 product(intx, SyncVerbose, 0, "(Unstable)") \ 1153 \ 1154 product(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1155 \ 1156 product(intx, hashCode, 5, \ 1157 "(Unstable) select hashCode generation algorithm") \ 1158 \ 1159 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1160 "(Unstable, Linux-specific) " \ 1161 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1162 \ 1163 product(bool, FilterSpuriousWakeups, true, \ 1164 "Prevent spurious or premature wakeups from object.wait " \ 1165 "(Solaris only)") \ 1166 \ 1167 experimental(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1168 \ 1169 experimental(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1170 \ 1171 experimental(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1172 \ 1173 develop(bool, UsePthreads, false, \ 1174 "Use pthread-based instead of libthread-based synchronization " \ 1175 "(SPARC only)") \ 1176 \ 1177 product(bool, AdjustConcurrency, false, \ 1178 "Call thr_setconcurrency at thread creation time to avoid " \ 1179 "LWP starvation on MP systems (for Solaris Only)") \ 1180 \ 1181 product(bool, ReduceSignalUsage, false, \ 1182 "Reduce the use of OS signals in Java and/or the VM") \ 1183 \ 1184 develop_pd(bool, ShareVtableStubs, \ 1185 "Share vtable stubs (smaller code but worse branch prediction") \ 1186 \ 1187 develop(bool, LoadLineNumberTables, true, \ 1188 "Tell whether the class file parser loads line number tables") \ 1189 \ 1190 develop(bool, LoadLocalVariableTables, true, \ 1191 "Tell whether the class file parser loads local variable tables") \ 1192 \ 1193 develop(bool, LoadLocalVariableTypeTables, true, \ 1194 "Tell whether the class file parser loads local variable type" \ 1195 "tables") \ 1196 \ 1197 product(bool, AllowUserSignalHandlers, false, \ 1198 "Do not complain if the application installs signal handlers " \ 1199 "(Solaris & Linux only)") \ 1200 \ 1201 product(bool, UseSignalChaining, true, \ 1202 "Use signal-chaining to invoke signal handlers installed " \ 1203 "by the application (Solaris & Linux only)") \ 1204 \ 1205 product(bool, UseAltSigs, false, \ 1206 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1207 "internal signals (Solaris only)") \ 1208 \ 1209 product(bool, AllowJNIEnvProxy, false, \ 1210 "Allow JNIEnv proxies for jdbx") \ 1211 \ 1212 product(bool, JNIDetachReleasesMonitors, true, \ 1213 "JNI DetachCurrentThread releases monitors owned by thread") \ 1214 \ 1215 product(bool, RestoreMXCSROnJNICalls, false, \ 1216 "Restore MXCSR when returning from JNI calls") \ 1217 \ 1218 product(bool, CheckJNICalls, false, \ 1219 "Verify all arguments to JNI calls") \ 1220 \ 1221 product(bool, CheckEndorsedAndExtDirs, false, \ 1222 "Verify the endorsed and extension directories are not used") \ 1223 \ 1224 product(bool, UseFastJNIAccessors, true, \ 1225 "Use optimized versions of Get<Primitive>Field") \ 1226 \ 1227 product(intx, MaxJNILocalCapacity, 65536, \ 1228 "Maximum allowable local JNI handle capacity to " \ 1229 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1230 "where <= 0 is unlimited, default: 65536") \ 1231 \ 1232 product(bool, EagerXrunInit, false, \ 1233 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1234 "but not all -Xrun libraries may support the state of the VM " \ 1235 "at this time") \ 1236 \ 1237 product(bool, PreserveAllAnnotations, false, \ 1238 "Preserve RuntimeInvisibleAnnotations as well " \ 1239 "as RuntimeVisibleAnnotations") \ 1240 \ 1241 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1242 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1243 \ 1244 product(bool, LazyBootClassLoader, true, \ 1245 "Enable/disable lazy opening of boot class path entries") \ 1246 \ 1247 product(bool, UseXMMForArrayCopy, false, \ 1248 "Use SSE2 MOVQ instruction for Arraycopy") \ 1249 \ 1250 product(intx, FieldsAllocationStyle, 1, \ 1251 "0 - type based with oops first, 1 - with oops last, " \ 1252 "2 - oops in super and sub classes are together") \ 1253 \ 1254 product(bool, CompactFields, true, \ 1255 "Allocate nonstatic fields in gaps between previous fields") \ 1256 \ 1257 notproduct(bool, PrintFieldLayout, false, \ 1258 "Print field layout for each class") \ 1259 \ 1260 product(intx, ContendedPaddingWidth, 128, \ 1261 "How many bytes to pad the fields/classes marked @Contended with")\ 1262 \ 1263 product(bool, EnableContended, true, \ 1264 "Enable @Contended annotation support") \ 1265 \ 1266 product(bool, RestrictContended, true, \ 1267 "Restrict @Contended to trusted classes") \ 1268 \ 1269 product(bool, UseBiasedLocking, true, \ 1270 "Enable biased locking in JVM") \ 1271 \ 1272 product(intx, BiasedLockingStartupDelay, 4000, \ 1273 "Number of milliseconds to wait before enabling biased locking") \ 1274 \ 1275 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1276 "Print statistics of biased locking in JVM") \ 1277 \ 1278 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1279 "Threshold of number of revocations per type to try to " \ 1280 "rebias all objects in the heap of that type") \ 1281 \ 1282 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1283 "Threshold of number of revocations per type to permanently " \ 1284 "revoke biases of all objects in the heap of that type") \ 1285 \ 1286 product(intx, BiasedLockingDecayTime, 25000, \ 1287 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1288 "type after previous bulk rebias") \ 1289 \ 1290 product(bool, ExitOnOutOfMemoryError, false, \ 1291 "JVM exits on the first occurrence of an out-of-memory error") \ 1292 \ 1293 product(bool, CrashOnOutOfMemoryError, false, \ 1294 "JVM aborts, producing an error log and core/mini dump, on the " \ 1295 "first occurrence of an out-of-memory error") \ 1296 \ 1297 /* tracing */ \ 1298 \ 1299 notproduct(bool, TraceRuntimeCalls, false, \ 1300 "Trace run-time calls") \ 1301 \ 1302 develop(bool, TraceJNICalls, false, \ 1303 "Trace JNI calls") \ 1304 \ 1305 develop(bool, StressRewriter, false, \ 1306 "Stress linktime bytecode rewriting") \ 1307 \ 1308 notproduct(bool, TraceJVMCalls, false, \ 1309 "Trace JVM calls") \ 1310 \ 1311 product(ccstr, TraceJVMTI, NULL, \ 1312 "Trace flags for JVMTI functions and events") \ 1313 \ 1314 /* This option can change an EMCP method into an obsolete method. */ \ 1315 /* This can affect tests that except specific methods to be EMCP. */ \ 1316 /* This option should be used with caution. */ \ 1317 product(bool, StressLdcRewrite, false, \ 1318 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1319 \ 1320 product(intx, TraceRedefineClasses, 0, \ 1321 "Trace level for JVMTI RedefineClasses") \ 1322 \ 1323 develop(bool, StressMethodComparator, false, \ 1324 "Run the MethodComparator on all loaded methods") \ 1325 \ 1326 /* change to false by default sometime after Mustang */ \ 1327 product(bool, VerifyMergedCPBytecodes, true, \ 1328 "Verify bytecodes after RedefineClasses constant pool merging") \ 1329 \ 1330 develop(bool, TraceJNIHandleAllocation, false, \ 1331 "Trace allocation/deallocation of JNI handle blocks") \ 1332 \ 1333 develop(bool, TraceThreadEvents, false, \ 1334 "Trace all thread events") \ 1335 \ 1336 develop(bool, TraceBytecodes, false, \ 1337 "Trace bytecode execution") \ 1338 \ 1339 develop(bool, TraceClassInitialization, false, \ 1340 "Trace class initialization") \ 1341 \ 1342 develop(bool, TraceExceptions, false, \ 1343 "Trace exceptions") \ 1344 \ 1345 develop(bool, TraceICs, false, \ 1346 "Trace inline cache changes") \ 1347 \ 1348 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1349 "Trace method invocation counter overflow") \ 1350 \ 1351 develop(bool, TraceInlineCacheClearing, false, \ 1352 "Trace clearing of inline caches in nmethods") \ 1353 \ 1354 develop(bool, TraceDependencies, false, \ 1355 "Trace dependencies") \ 1356 \ 1357 develop(bool, VerifyDependencies, trueInDebug, \ 1358 "Exercise and verify the compilation dependency mechanism") \ 1359 \ 1360 develop(bool, TraceNewOopMapGeneration, false, \ 1361 "Trace OopMapGeneration") \ 1362 \ 1363 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1364 "Trace OopMapGeneration: print detailed cell states") \ 1365 \ 1366 develop(bool, TimeOopMap, false, \ 1367 "Time calls to GenerateOopMap::compute_map() in sum") \ 1368 \ 1369 develop(bool, TimeOopMap2, false, \ 1370 "Time calls to GenerateOopMap::compute_map() individually") \ 1371 \ 1372 develop(bool, TraceMonitorMismatch, false, \ 1373 "Trace monitor matching failures during OopMapGeneration") \ 1374 \ 1375 develop(bool, TraceOopMapRewrites, false, \ 1376 "Trace rewriting of method oops during oop map generation") \ 1377 \ 1378 develop(bool, TraceSafepoint, false, \ 1379 "Trace safepoint operations") \ 1380 \ 1381 develop(bool, TraceICBuffer, false, \ 1382 "Trace usage of IC buffer") \ 1383 \ 1384 develop(bool, TraceCompiledIC, false, \ 1385 "Trace changes of compiled IC") \ 1386 \ 1387 notproduct(bool, TraceZapDeadLocals, false, \ 1388 "Trace zapping dead locals") \ 1389 \ 1390 develop(bool, TraceStartupTime, false, \ 1391 "Trace setup time") \ 1392 \ 1393 develop(bool, TraceProtectionDomainVerification, false, \ 1394 "Trace protection domain verification") \ 1395 \ 1396 develop(bool, TraceClearedExceptions, false, \ 1397 "Print when an exception is forcibly cleared") \ 1398 \ 1399 product(bool, TraceClassResolution, false, \ 1400 "Trace all constant pool resolutions (for debugging)") \ 1401 \ 1402 product(bool, TraceBiasedLocking, false, \ 1403 "Trace biased locking in JVM") \ 1404 \ 1405 product(bool, TraceMonitorInflation, false, \ 1406 "Trace monitor inflation in JVM") \ 1407 \ 1408 /* gc */ \ 1409 \ 1410 product(bool, UseSerialGC, false, \ 1411 "Use the Serial garbage collector") \ 1412 \ 1413 product(bool, UseG1GC, false, \ 1414 "Use the Garbage-First garbage collector") \ 1415 \ 1416 product(bool, UseParallelGC, false, \ 1417 "Use the Parallel Scavenge garbage collector") \ 1418 \ 1419 product(bool, UseParallelOldGC, false, \ 1420 "Use the Parallel Old garbage collector") \ 1421 \ 1422 product(uintx, HeapMaximumCompactionInterval, 20, \ 1423 "How often should we maximally compact the heap (not allowing " \ 1424 "any dead space)") \ 1425 \ 1426 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1427 "The collection count for the first maximum compaction") \ 1428 \ 1429 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1430 "Use maximum compaction in the Parallel Old garbage collector " \ 1431 "for a system GC") \ 1432 \ 1433 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1434 "The mean used by the parallel compact dead wood " \ 1435 "limiter (a number between 0-100)") \ 1436 \ 1437 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1438 "The standard deviation used by the parallel compact dead wood " \ 1439 "limiter (a number between 0-100)") \ 1440 \ 1441 product(uintx, ParallelGCThreads, 0, \ 1442 "Number of parallel threads parallel gc will use") \ 1443 \ 1444 product(bool, UseDynamicNumberOfGCThreads, false, \ 1445 "Dynamically choose the number of parallel threads " \ 1446 "parallel gc will use") \ 1447 \ 1448 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1449 "Force dynamic selection of the number of " \ 1450 "parallel threads parallel gc will use to aid debugging") \ 1451 \ 1452 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1453 "Size of heap (bytes) per GC thread used in calculating the " \ 1454 "number of GC threads") \ 1455 \ 1456 product(bool, TraceDynamicGCThreads, false, \ 1457 "Trace the dynamic GC thread usage") \ 1458 \ 1459 develop(bool, ParallelOldGCSplitALot, false, \ 1460 "Provoke splitting (copying data from a young gen space to " \ 1461 "multiple destination spaces)") \ 1462 \ 1463 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1464 "How often to provoke splitting a young gen space") \ 1465 \ 1466 product(uintx, ConcGCThreads, 0, \ 1467 "Number of threads concurrent gc will use") \ 1468 \ 1469 product(uintx, YoungPLABSize, 4096, \ 1470 "Size of young gen promotion LAB's (in HeapWords)") \ 1471 \ 1472 product(uintx, OldPLABSize, 1024, \ 1473 "Size of old gen promotion LAB's (in HeapWords)") \ 1474 \ 1475 product(uintx, GCTaskTimeStampEntries, 200, \ 1476 "Number of time stamp entries per gc worker thread") \ 1477 \ 1478 product(bool, AlwaysTenure, false, \ 1479 "Always tenure objects in eden (ParallelGC only)") \ 1480 \ 1481 product(bool, NeverTenure, false, \ 1482 "Never tenure objects in eden, may tenure on overflow " \ 1483 "(ParallelGC only)") \ 1484 \ 1485 product(bool, ScavengeBeforeFullGC, true, \ 1486 "Scavenge youngest generation before each full GC, " \ 1487 "used with UseParallelGC") \ 1488 \ 1489 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1490 "Allow scavenges to occur when to-space contains objects") \ 1491 \ 1492 product(bool, UseConcMarkSweepGC, false, \ 1493 "Use Concurrent Mark-Sweep GC in the old generation") \ 1494 \ 1495 product(bool, ExplicitGCInvokesConcurrent, false, \ 1496 "A System.gc() request invokes a concurrent collection; " \ 1497 "(effective only when UseConcMarkSweepGC)") \ 1498 \ 1499 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1500 "A System.gc() request invokes a concurrent collection and " \ 1501 "also unloads classes during such a concurrent gc cycle " \ 1502 "(effective only when UseConcMarkSweepGC)") \ 1503 \ 1504 product(bool, GCLockerInvokesConcurrent, false, \ 1505 "The exit of a JNI critical section necessitating a scavenge, " \ 1506 "also kicks off a background concurrent collection") \ 1507 \ 1508 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1509 "How much the GC can expand the eden by while the GC locker " \ 1510 "is active (as a percentage)") \ 1511 \ 1512 diagnostic(uintx, GCLockerRetryAllocationCount, 2, \ 1513 "Number of times to retry allocations when " \ 1514 "blocked by the GC locker") \ 1515 \ 1516 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1517 "Use adaptive free lists in the CMS generation") \ 1518 \ 1519 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1520 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1521 \ 1522 develop(bool, RotateCMSCollectionTypes, false, \ 1523 "Rotate the CMS collections among concurrent and STW") \ 1524 \ 1525 product(bool, UseCMSBestFit, true, \ 1526 "Use CMS best fit allocation strategy") \ 1527 \ 1528 product(bool, UseCMSCollectionPassing, true, \ 1529 "Use passing of collection from background to foreground") \ 1530 \ 1531 product(bool, UseParNewGC, false, \ 1532 "Use parallel threads in the new generation") \ 1533 \ 1534 product(bool, ParallelGCVerbose, false, \ 1535 "Verbose output for parallel gc") \ 1536 \ 1537 product(uintx, ParallelGCBufferWastePct, 10, \ 1538 "Wasted fraction of parallel allocation buffer") \ 1539 \ 1540 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1541 "Retain parallel allocation buffers across scavenges; " \ 1542 "it is disabled because this currently conflicts with " \ 1543 "parallel card scanning under certain conditions.") \ 1544 \ 1545 product(uintx, TargetPLABWastePct, 10, \ 1546 "Target wasted space in last buffer as percent of overall " \ 1547 "allocation") \ 1548 \ 1549 product(uintx, PLABWeight, 75, \ 1550 "Percentage (0-100) used to weigh the current sample when " \ 1551 "computing exponentially decaying average for ResizePLAB") \ 1552 \ 1553 product(bool, ResizePLAB, true, \ 1554 "Dynamically resize (survivor space) promotion LAB's") \ 1555 \ 1556 product(bool, PrintPLAB, false, \ 1557 "Print (survivor space) promotion LAB's sizing decisions") \ 1558 \ 1559 product(intx, ParGCArrayScanChunk, 50, \ 1560 "Scan a subset of object array and push remainder, if array is " \ 1561 "bigger than this") \ 1562 \ 1563 product(bool, ParGCUseLocalOverflow, false, \ 1564 "Instead of a global overflow list, use local overflow stacks") \ 1565 \ 1566 product(bool, ParGCTrimOverflow, true, \ 1567 "Eagerly trim the local overflow lists " \ 1568 "(when ParGCUseLocalOverflow)") \ 1569 \ 1570 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1571 "Simulate work queue overflow in ParNew") \ 1572 \ 1573 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1574 "An `interval' counter that determines how frequently " \ 1575 "we simulate overflow; a smaller number increases frequency") \ 1576 \ 1577 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1578 "The desired number of objects to claim from the overflow list") \ 1579 \ 1580 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1581 "The number of strides per worker thread that we divide up the " \ 1582 "card table scanning work into") \ 1583 \ 1584 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1585 "The number of cards in each chunk of the parallel chunks used " \ 1586 "during card table scanning") \ 1587 \ 1588 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1589 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1590 "for parallel GC") \ 1591 \ 1592 product(uintx, OldPLABWeight, 50, \ 1593 "Percentage (0-100) used to weight the current sample when " \ 1594 "computing exponentially decaying average for resizing " \ 1595 "CMSParPromoteBlocksToClaim") \ 1596 \ 1597 product(bool, ResizeOldPLAB, true, \ 1598 "Dynamically resize (old gen) promotion LAB's") \ 1599 \ 1600 product(bool, PrintOldPLAB, false, \ 1601 "Print (old gen) promotion LAB's sizing decisions") \ 1602 \ 1603 product(uintx, CMSOldPLABMin, 16, \ 1604 "Minimum size of CMS gen promotion LAB caches per worker " \ 1605 "per block size") \ 1606 \ 1607 product(uintx, CMSOldPLABMax, 1024, \ 1608 "Maximum size of CMS gen promotion LAB caches per worker " \ 1609 "per block size") \ 1610 \ 1611 product(uintx, CMSOldPLABNumRefills, 4, \ 1612 "Nominal number of refills of CMS gen promotion LAB cache " \ 1613 "per worker per block size") \ 1614 \ 1615 product(bool, CMSOldPLABResizeQuicker, false, \ 1616 "React on-the-fly during a scavenge to a sudden " \ 1617 "change in block demand rate") \ 1618 \ 1619 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1620 "The tolerance of the phase-change detector for on-the-fly " \ 1621 "PLAB resizing during a scavenge") \ 1622 \ 1623 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1624 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1625 "during a scavenge") \ 1626 \ 1627 product(bool, AlwaysPreTouch, false, \ 1628 "Force all freshly committed pages to be pre-touched") \ 1629 \ 1630 product_pd(uintx, CMSYoungGenPerWorker, \ 1631 "The maximum size of young gen chosen by default per GC worker " \ 1632 "thread available") \ 1633 \ 1634 product(bool, CMSIncrementalMode, false, \ 1635 "Whether CMS GC should operate in \"incremental\" mode") \ 1636 \ 1637 product(uintx, CMSIncrementalDutyCycle, 10, \ 1638 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1639 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1640 "value.") \ 1641 \ 1642 product(bool, CMSIncrementalPacing, true, \ 1643 "Whether the CMS incremental mode duty cycle should be " \ 1644 "automatically adjusted") \ 1645 \ 1646 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1647 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1648 "used when CMSIncrementalPacing is enabled") \ 1649 \ 1650 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1651 "Percentage (0-100) used to add conservatism when computing the " \ 1652 "duty cycle") \ 1653 \ 1654 product(uintx, CMSIncrementalOffset, 0, \ 1655 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1656 "is shifted to the right within the period between young GCs") \ 1657 \ 1658 product(uintx, CMSExpAvgFactor, 50, \ 1659 "Percentage (0-100) used to weigh the current sample when " \ 1660 "computing exponential averages for CMS statistics") \ 1661 \ 1662 product(uintx, CMS_FLSWeight, 75, \ 1663 "Percentage (0-100) used to weigh the current sample when " \ 1664 "computing exponentially decaying averages for CMS FLS " \ 1665 "statistics") \ 1666 \ 1667 product(uintx, CMS_FLSPadding, 1, \ 1668 "The multiple of deviation from mean to use for buffering " \ 1669 "against volatility in free list demand") \ 1670 \ 1671 product(uintx, FLSCoalescePolicy, 2, \ 1672 "CMS: aggressiveness level for coalescing, increasing " \ 1673 "from 0 to 4") \ 1674 \ 1675 product(bool, FLSAlwaysCoalesceLarge, false, \ 1676 "CMS: larger free blocks are always available for coalescing") \ 1677 \ 1678 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1679 "CMS: the smaller the percentage the greater the coalescing " \ 1680 "force") \ 1681 \ 1682 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1683 "CMS: the factor by which to inflate estimated demand of small " \ 1684 "block sizes to prevent coalescing with an adjoining block") \ 1685 \ 1686 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1687 "CMS: the factor by which to inflate estimated demand of large " \ 1688 "block sizes to prevent coalescing with an adjoining block") \ 1689 \ 1690 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1691 "CMS: the factor by which to inflate estimated demand of small " \ 1692 "block sizes to prevent splitting to supply demand for smaller " \ 1693 "blocks") \ 1694 \ 1695 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1696 "CMS: the factor by which to inflate estimated demand of large " \ 1697 "block sizes to prevent splitting to supply demand for smaller " \ 1698 "blocks") \ 1699 \ 1700 product(bool, CMSExtrapolateSweep, false, \ 1701 "CMS: cushion for block demand during sweep") \ 1702 \ 1703 product(uintx, CMS_SweepWeight, 75, \ 1704 "Percentage (0-100) used to weight the current sample when " \ 1705 "computing exponentially decaying average for inter-sweep " \ 1706 "duration") \ 1707 \ 1708 product(uintx, CMS_SweepPadding, 1, \ 1709 "The multiple of deviation from mean to use for buffering " \ 1710 "against volatility in inter-sweep duration") \ 1711 \ 1712 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1713 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1714 "duration exceeds this threshold in milliseconds") \ 1715 \ 1716 develop(bool, CMSTraceIncrementalMode, false, \ 1717 "Trace CMS incremental mode") \ 1718 \ 1719 develop(bool, CMSTraceIncrementalPacing, false, \ 1720 "Trace CMS incremental mode pacing computation") \ 1721 \ 1722 develop(bool, CMSTraceThreadState, false, \ 1723 "Trace the CMS thread state (enable the trace_state() method)") \ 1724 \ 1725 product(bool, CMSClassUnloadingEnabled, true, \ 1726 "Whether class unloading enabled when using CMS GC") \ 1727 \ 1728 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1729 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1730 "count for which classes may not be unloaded") \ 1731 \ 1732 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1733 "Compact when asked to collect CMS gen with " \ 1734 "clear_all_soft_refs()") \ 1735 \ 1736 product(bool, UseCMSCompactAtFullCollection, true, \ 1737 "Use Mark-Sweep-Compact algorithm at full collections") \ 1738 \ 1739 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1740 "Number of CMS full collection done before compaction if > 0") \ 1741 \ 1742 develop(intx, CMSDictionaryChoice, 0, \ 1743 "Use BinaryTreeDictionary as default in the CMS generation") \ 1744 \ 1745 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1746 "Replenish an indexed free list with this number of chunks") \ 1747 \ 1748 product(bool, CMSReplenishIntermediate, true, \ 1749 "Replenish all intermediate free-list caches") \ 1750 \ 1751 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1752 "When satisfying batched demand, split blocks from the " \ 1753 "IndexedFreeList whose size is a multiple of requested size") \ 1754 \ 1755 product(bool, CMSLoopWarn, false, \ 1756 "Warn in case of excessive CMS looping") \ 1757 \ 1758 develop(bool, CMSOverflowEarlyRestoration, false, \ 1759 "Restore preserved marks early") \ 1760 \ 1761 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1762 "Size of marking stack") \ 1763 \ 1764 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1765 "Maximum size of marking stack") \ 1766 \ 1767 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1768 "Simulate frequent marking stack / work queue overflow") \ 1769 \ 1770 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1771 "An \"interval\" counter that determines how frequently " \ 1772 "to simulate overflow; a smaller number increases frequency") \ 1773 \ 1774 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1775 "(Temporary, subject to experimentation) " \ 1776 "Maximum number of abortable preclean iterations, if > 0") \ 1777 \ 1778 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1779 "(Temporary, subject to experimentation) " \ 1780 "Maximum time in abortable preclean (in milliseconds)") \ 1781 \ 1782 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1783 "(Temporary, subject to experimentation) " \ 1784 "Nominal minimum work per abortable preclean iteration") \ 1785 \ 1786 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1787 "(Temporary, subject to experimentation) " \ 1788 "Time that we sleep between iterations when not given " \ 1789 "enough work per iteration") \ 1790 \ 1791 product(uintx, CMSRescanMultiple, 32, \ 1792 "Size (in cards) of CMS parallel rescan task") \ 1793 \ 1794 product(uintx, CMSConcMarkMultiple, 32, \ 1795 "Size (in cards) of CMS concurrent MT marking task") \ 1796 \ 1797 product(bool, CMSAbortSemantics, false, \ 1798 "Whether abort-on-overflow semantics is implemented") \ 1799 \ 1800 product(bool, CMSParallelInitialMarkEnabled, true, \ 1801 "Use the parallel initial mark.") \ 1802 \ 1803 product(bool, CMSParallelRemarkEnabled, true, \ 1804 "Whether parallel remark enabled (only if ParNewGC)") \ 1805 \ 1806 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1807 "Whether parallel remark of survivor space " \ 1808 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1809 \ 1810 product(bool, CMSPLABRecordAlways, true, \ 1811 "Always record survivor space PLAB boundaries (effective only " \ 1812 "if CMSParallelSurvivorRemarkEnabled)") \ 1813 \ 1814 product(bool, CMSEdenChunksRecordAlways, true, \ 1815 "Always record eden chunks used for the parallel initial mark " \ 1816 "or remark of eden") \ 1817 \ 1818 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1819 "Print the eden and the survivor chunks used for the parallel " \ 1820 "initial mark or remark of the eden/survivor spaces") \ 1821 \ 1822 product(bool, CMSConcurrentMTEnabled, true, \ 1823 "Whether multi-threaded concurrent work enabled " \ 1824 "(effective only if ParNewGC)") \ 1825 \ 1826 product(bool, CMSPrecleaningEnabled, true, \ 1827 "Whether concurrent precleaning enabled") \ 1828 \ 1829 product(uintx, CMSPrecleanIter, 3, \ 1830 "Maximum number of precleaning iteration passes") \ 1831 \ 1832 product(uintx, CMSPrecleanNumerator, 2, \ 1833 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1834 "ratio") \ 1835 \ 1836 product(uintx, CMSPrecleanDenominator, 3, \ 1837 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1838 "ratio") \ 1839 \ 1840 product(bool, CMSPrecleanRefLists1, true, \ 1841 "Preclean ref lists during (initial) preclean phase") \ 1842 \ 1843 product(bool, CMSPrecleanRefLists2, false, \ 1844 "Preclean ref lists during abortable preclean phase") \ 1845 \ 1846 product(bool, CMSPrecleanSurvivors1, false, \ 1847 "Preclean survivors during (initial) preclean phase") \ 1848 \ 1849 product(bool, CMSPrecleanSurvivors2, true, \ 1850 "Preclean survivors during abortable preclean phase") \ 1851 \ 1852 product(uintx, CMSPrecleanThreshold, 1000, \ 1853 "Do not iterate again if number of dirty cards is less than this")\ 1854 \ 1855 product(bool, CMSCleanOnEnter, true, \ 1856 "Clean-on-enter optimization for reducing number of dirty cards") \ 1857 \ 1858 product(uintx, CMSRemarkVerifyVariant, 1, \ 1859 "Choose variant (1,2) of verification following remark") \ 1860 \ 1861 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1862 "If Eden size is below this, do not try to schedule remark") \ 1863 \ 1864 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1865 "The Eden occupancy percentage (0-100) at which " \ 1866 "to try and schedule remark pause") \ 1867 \ 1868 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1869 "Start sampling eden top at least before young gen " \ 1870 "occupancy reaches 1/<ratio> of the size at which " \ 1871 "we plan to schedule remark") \ 1872 \ 1873 product(uintx, CMSSamplingGrain, 16*K, \ 1874 "The minimum distance between eden samples for CMS (see above)") \ 1875 \ 1876 product(bool, CMSScavengeBeforeRemark, false, \ 1877 "Attempt scavenge before the CMS remark step") \ 1878 \ 1879 develop(bool, CMSTraceSweeper, false, \ 1880 "Trace some actions of the CMS sweeper") \ 1881 \ 1882 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1883 "Don't drain below this size per parallel worker/thief") \ 1884 \ 1885 manageable(intx, CMSWaitDuration, 2000, \ 1886 "Time in milliseconds that CMS thread waits for young GC") \ 1887 \ 1888 develop(uintx, CMSCheckInterval, 1000, \ 1889 "Interval in milliseconds that CMS thread checks if it " \ 1890 "should start a collection cycle") \ 1891 \ 1892 product(bool, CMSYield, true, \ 1893 "Yield between steps of CMS") \ 1894 \ 1895 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1896 "Bitmap operations should process at most this many bits " \ 1897 "between yields") \ 1898 \ 1899 product(bool, CMSDumpAtPromotionFailure, false, \ 1900 "Dump useful information about the state of the CMS old " \ 1901 "generation upon a promotion failure") \ 1902 \ 1903 product(bool, CMSPrintChunksInDump, false, \ 1904 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1905 "more detailed information about the free chunks") \ 1906 \ 1907 product(bool, CMSPrintObjectsInDump, false, \ 1908 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1909 "more detailed information about the allocated objects") \ 1910 \ 1911 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1912 "Verify that all references across the FLS boundary " \ 1913 "are to valid objects") \ 1914 \ 1915 diagnostic(bool, FLSVerifyLists, false, \ 1916 "Do lots of (expensive) FreeListSpace verification") \ 1917 \ 1918 diagnostic(bool, FLSVerifyIndexTable, false, \ 1919 "Do lots of (expensive) FLS index table verification") \ 1920 \ 1921 develop(bool, FLSVerifyDictionary, false, \ 1922 "Do lots of (expensive) FLS dictionary verification") \ 1923 \ 1924 develop(bool, VerifyBlockOffsetArray, false, \ 1925 "Do (expensive) block offset array verification") \ 1926 \ 1927 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1928 "Maintain _unallocated_block in BlockOffsetArray " \ 1929 "(currently applicable only to CMS collector)") \ 1930 \ 1931 develop(bool, TraceCMSState, false, \ 1932 "Trace the state of the CMS collection") \ 1933 \ 1934 product(intx, RefDiscoveryPolicy, 0, \ 1935 "Select type of reference discovery policy: " \ 1936 "reference-based(0) or referent-based(1)") \ 1937 \ 1938 product(bool, ParallelRefProcEnabled, false, \ 1939 "Enable parallel reference processing whenever possible") \ 1940 \ 1941 product(bool, ParallelRefProcBalancingEnabled, true, \ 1942 "Enable balancing of reference processing queues") \ 1943 \ 1944 product(uintx, CMSTriggerRatio, 80, \ 1945 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1946 "allocated before a CMS collection cycle commences") \ 1947 \ 1948 product(uintx, CMSBootstrapOccupancy, 50, \ 1949 "Percentage CMS generation occupancy at which to " \ 1950 "initiate CMS collection for bootstrapping collection stats") \ 1951 \ 1952 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1953 "Percentage CMS generation occupancy to start a CMS collection " \ 1954 "cycle. A negative value means that CMSTriggerRatio is used") \ 1955 \ 1956 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1957 "Percentage of the (entire) heap occupancy to start a " \ 1958 "concurrent GC cycle. It is used by GCs that trigger a " \ 1959 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1960 "not just one of the generations (e.g., G1). A value of 0 " \ 1961 "denotes 'do constant GC cycles'.") \ 1962 \ 1963 manageable(intx, CMSTriggerInterval, -1, \ 1964 "Commence a CMS collection cycle (at least) every so many " \ 1965 "milliseconds (0 permanently, -1 disabled)") \ 1966 \ 1967 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1968 "Only use occupancy as a criterion for starting a CMS collection")\ 1969 \ 1970 product(uintx, CMSIsTooFullPercentage, 98, \ 1971 "An absolute ceiling above which CMS will always consider the " \ 1972 "unloading of classes when class unloading is enabled") \ 1973 \ 1974 develop(bool, CMSTestInFreeList, false, \ 1975 "Check if the coalesced range is already in the " \ 1976 "free lists as claimed") \ 1977 \ 1978 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1979 "Check that all the garbage collected was returned to the " \ 1980 "free lists") \ 1981 \ 1982 notproduct(bool, ScavengeALot, false, \ 1983 "Force scavenge at every Nth exit from the runtime system " \ 1984 "(N=ScavengeALotInterval)") \ 1985 \ 1986 develop(bool, FullGCALot, false, \ 1987 "Force full gc at every Nth exit from the runtime system " \ 1988 "(N=FullGCALotInterval)") \ 1989 \ 1990 notproduct(bool, GCALotAtAllSafepoints, false, \ 1991 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1992 \ 1993 product(bool, PrintPromotionFailure, false, \ 1994 "Print additional diagnostic information following " \ 1995 "promotion failure") \ 1996 \ 1997 notproduct(bool, PromotionFailureALot, false, \ 1998 "Use promotion failure handling on every youngest generation " \ 1999 "collection") \ 2000 \ 2001 develop(uintx, PromotionFailureALotCount, 1000, \ 2002 "Number of promotion failures occurring at ParGCAllocBuffer " \ 2003 "refill attempts (ParNew) or promotion attempts " \ 2004 "(other young collectors)") \ 2005 \ 2006 develop(uintx, PromotionFailureALotInterval, 5, \ 2007 "Total collections between promotion failures alot") \ 2008 \ 2009 experimental(uintx, WorkStealingSleepMillis, 1, \ 2010 "Sleep time when sleep is used for yields") \ 2011 \ 2012 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2013 "Number of yields before a sleep is done during workstealing") \ 2014 \ 2015 experimental(uintx, WorkStealingHardSpins, 4096, \ 2016 "Number of iterations in a spin loop between checks on " \ 2017 "time out of hard spin") \ 2018 \ 2019 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2020 "Ratio of hard spins to calls to yield") \ 2021 \ 2022 develop(uintx, ObjArrayMarkingStride, 512, \ 2023 "Number of object array elements to push onto the marking stack " \ 2024 "before pushing a continuation entry") \ 2025 \ 2026 develop(bool, MetadataAllocationFailALot, false, \ 2027 "Fail metadata allocations at intervals controlled by " \ 2028 "MetadataAllocationFailALotInterval") \ 2029 \ 2030 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2031 "Metadata allocation failure a lot interval") \ 2032 \ 2033 develop(bool, TraceMetadataChunkAllocation, false, \ 2034 "Trace chunk metadata allocations") \ 2035 \ 2036 product(bool, TraceMetadataHumongousAllocation, false, \ 2037 "Trace humongous metadata allocations") \ 2038 \ 2039 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2040 "Trace virtual space metadata allocations") \ 2041 \ 2042 notproduct(bool, ExecuteInternalVMTests, false, \ 2043 "Enable execution of internal VM tests") \ 2044 \ 2045 notproduct(bool, VerboseInternalVMTests, false, \ 2046 "Turn on logging for internal VM tests.") \ 2047 \ 2048 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2049 \ 2050 product_pd(bool, ResizeTLAB, \ 2051 "Dynamically resize TLAB size for threads") \ 2052 \ 2053 product(bool, ZeroTLAB, false, \ 2054 "Zero out the newly created TLAB") \ 2055 \ 2056 product(bool, FastTLABRefill, true, \ 2057 "Use fast TLAB refill code") \ 2058 \ 2059 product(bool, PrintTLAB, false, \ 2060 "Print various TLAB related information") \ 2061 \ 2062 product(bool, TLABStats, true, \ 2063 "Provide more detailed and expensive TLAB statistics " \ 2064 "(with PrintTLAB)") \ 2065 \ 2066 product_pd(bool, NeverActAsServerClassMachine, \ 2067 "Never act like a server-class machine") \ 2068 \ 2069 product(bool, AlwaysActAsServerClassMachine, false, \ 2070 "Always act like a server-class machine") \ 2071 \ 2072 product_pd(uint64_t, MaxRAM, \ 2073 "Real memory size (in bytes) used to set maximum heap size") \ 2074 \ 2075 product(bool, AggressiveHeap, false, \ 2076 "Optimize heap options for long-running memory intensive apps") \ 2077 \ 2078 product(uintx, ErgoHeapSizeLimit, 0, \ 2079 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2080 "MaxRAM * MaxRAMPercentage / 100") \ 2081 \ 2082 experimental(bool, UseCGroupMemoryLimitForHeap, false, \ 2083 "Use CGroup memory limit as physical memory limit for heap " \ 2084 "sizing" \ 2085 "Deprecated, replaced by container support") \ 2086 \ 2087 diagnostic(bool, PrintContainerInfo, false, \ 2088 "Print container related information") \ 2089 \ 2090 diagnostic(bool, PrintActiveCpus, false, \ 2091 "Print the number of CPUs detected in os::active_processor_count") \ 2092 \ 2093 product(uintx, MaxRAMFraction, 4, \ 2094 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2095 "size") \ 2096 \ 2097 product(uintx, DefaultMaxRAMFraction, 4, \ 2098 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2099 "size; deprecated: to be renamed to MaxRAMFraction") \ 2100 \ 2101 product(uintx, MinRAMFraction, 2, \ 2102 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2103 "size on systems with small physical memory size") \ 2104 \ 2105 product(uintx, InitialRAMFraction, 64, \ 2106 "Fraction (1/n) of real memory used for initial heap size") \ 2107 \ 2108 product(double, MaxRAMPercentage, 25.0, \ 2109 "Maximum percentage of real memory used for maximum heap size") \ 2110 \ 2111 product(double, MinRAMPercentage, 50.0, \ 2112 "Minimum percentage of real memory used for maximum heap" \ 2113 "size on systems with small physical memory size") \ 2114 \ 2115 product(double, InitialRAMPercentage, 1.5625, \ 2116 "Percentage of real memory used for initial heap size") \ 2117 \ 2118 product(intx, ActiveProcessorCount, -1, \ 2119 "Specify the CPU count the VM should use and report as active") \ 2120 \ 2121 develop(uintx, MaxVirtMemFraction, 2, \ 2122 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2123 "determining maximum heap size") \ 2124 \ 2125 product(bool, UseAutoGCSelectPolicy, false, \ 2126 "Use automatic collection selection policy") \ 2127 \ 2128 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2129 "Automatic GC selection pause threshold in milliseconds") \ 2130 \ 2131 product(bool, UseAdaptiveSizePolicy, true, \ 2132 "Use adaptive generation sizing policies") \ 2133 \ 2134 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2135 "Use adaptive survivor sizing policies") \ 2136 \ 2137 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2138 "Use adaptive young-old sizing policies at minor collections") \ 2139 \ 2140 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2141 "Use adaptive young-old sizing policies at major collections") \ 2142 \ 2143 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2144 "Include statistics from System.gc() for adaptive size policy") \ 2145 \ 2146 product(bool, UseAdaptiveGCBoundary, false, \ 2147 "Allow young-old boundary to move") \ 2148 \ 2149 develop(bool, TraceAdaptiveGCBoundary, false, \ 2150 "Trace young-old boundary moves") \ 2151 \ 2152 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2153 "Resize the virtual spaces of the young or old generations") \ 2154 \ 2155 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2156 "Policy for changing generation size for throughput goals") \ 2157 \ 2158 product(uintx, AdaptiveSizePausePolicy, 0, \ 2159 "Policy for changing generation size for pause goals") \ 2160 \ 2161 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2162 "Adjust tenured generation to achieve a minor pause goal") \ 2163 \ 2164 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2165 "Adjust young generation to achieve a major pause goal") \ 2166 \ 2167 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2168 "Number of steps where heuristics is used before data is used") \ 2169 \ 2170 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2171 "Number of collections before the adaptive sizing is started") \ 2172 \ 2173 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2174 "Collection interval for printing information; zero means never") \ 2175 \ 2176 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2177 "Use adaptive minimum footprint as a goal") \ 2178 \ 2179 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2180 "Weight given to exponential resizing, between 0 and 100") \ 2181 \ 2182 product(uintx, AdaptiveTimeWeight, 25, \ 2183 "Weight given to time in adaptive policy, between 0 and 100") \ 2184 \ 2185 product(uintx, PausePadding, 1, \ 2186 "How much buffer to keep for pause time") \ 2187 \ 2188 product(uintx, PromotedPadding, 3, \ 2189 "How much buffer to keep for promotion failure") \ 2190 \ 2191 product(uintx, SurvivorPadding, 3, \ 2192 "How much buffer to keep for survivor overflow") \ 2193 \ 2194 product(uintx, ThresholdTolerance, 10, \ 2195 "Allowed collection cost difference between generations") \ 2196 \ 2197 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2198 "If collection costs are within margin, reduce both by full " \ 2199 "delta") \ 2200 \ 2201 product(uintx, YoungGenerationSizeIncrement, 20, \ 2202 "Adaptive size percentage change in young generation") \ 2203 \ 2204 product(uintx, YoungGenerationSizeSupplement, 80, \ 2205 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2206 \ 2207 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2208 "Decay factor to YoungedGenerationSizeSupplement") \ 2209 \ 2210 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2211 "Adaptive size percentage change in tenured generation") \ 2212 \ 2213 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2214 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2215 \ 2216 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2217 "Decay factor to TenuredGenerationSizeIncrement") \ 2218 \ 2219 product(uintx, MaxGCPauseMillis, max_uintx, \ 2220 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2221 "or (G1 Only) the maximum GC time per MMU time slice") \ 2222 \ 2223 product(uintx, GCPauseIntervalMillis, 0, \ 2224 "Time slice for MMU specification") \ 2225 \ 2226 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2227 "Adaptive size policy maximum GC minor pause time goal " \ 2228 "in millisecond") \ 2229 \ 2230 product(uintx, GCTimeRatio, 99, \ 2231 "Adaptive size policy application time to GC time ratio") \ 2232 \ 2233 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2234 "Adaptive size scale down factor for shrinking") \ 2235 \ 2236 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2237 "Adaptive size decays the major cost for long major intervals") \ 2238 \ 2239 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2240 "Time scale over which major costs decay") \ 2241 \ 2242 product(uintx, MinSurvivorRatio, 3, \ 2243 "Minimum ratio of young generation/survivor space size") \ 2244 \ 2245 product(uintx, InitialSurvivorRatio, 8, \ 2246 "Initial ratio of young generation/survivor space size") \ 2247 \ 2248 product(uintx, BaseFootPrintEstimate, 256*M, \ 2249 "Estimate of footprint other than Java Heap") \ 2250 \ 2251 product(bool, UseGCOverheadLimit, true, \ 2252 "Use policy to limit of proportion of time spent in GC " \ 2253 "before an OutOfMemory error is thrown") \ 2254 \ 2255 product(uintx, GCTimeLimit, 98, \ 2256 "Limit of the proportion of time spent in GC before " \ 2257 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2258 \ 2259 product(uintx, GCHeapFreeLimit, 2, \ 2260 "Minimum percentage of free space after a full GC before an " \ 2261 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2262 \ 2263 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2264 "Number of consecutive collections before gc time limit fires") \ 2265 \ 2266 product(bool, PrintAdaptiveSizePolicy, false, \ 2267 "Print information about AdaptiveSizePolicy") \ 2268 \ 2269 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2270 "How far ahead to prefetch destination area (<= 0 means off)") \ 2271 \ 2272 product(intx, PrefetchScanIntervalInBytes, -1, \ 2273 "How far ahead to prefetch scan area (<= 0 means off)") \ 2274 \ 2275 product(intx, PrefetchFieldsAhead, -1, \ 2276 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2277 \ 2278 diagnostic(bool, VerifySilently, false, \ 2279 "Do not print the verification progress") \ 2280 \ 2281 diagnostic(bool, VerifyDuringStartup, false, \ 2282 "Verify memory system before executing any Java code " \ 2283 "during VM initialization") \ 2284 \ 2285 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2286 "Verify system before exiting") \ 2287 \ 2288 diagnostic(bool, VerifyBeforeGC, false, \ 2289 "Verify memory system before GC") \ 2290 \ 2291 diagnostic(bool, VerifyAfterGC, false, \ 2292 "Verify memory system after GC") \ 2293 \ 2294 diagnostic(bool, VerifyDuringGC, false, \ 2295 "Verify memory system during GC (between phases)") \ 2296 \ 2297 diagnostic(ccstrlist, VerifySubSet, "", \ 2298 "Memory sub-systems to verify when Verify*GC flag(s) " \ 2299 "are enabled. One or more sub-systems can be specified " \ 2300 "in a comma separated string. Sub-systems are: " \ 2301 "threads, heap, symbol_table, string_table, codecache, " \ 2302 "dictionary, classloader_data_graph, metaspace, jni_handles, " \ 2303 "c-heap, codecache_oops") \ 2304 \ 2305 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2306 "Enable parallel memory system verification") \ 2307 \ 2308 diagnostic(bool, DeferInitialCardMark, false, \ 2309 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2310 "may arise from new_pre_store_barrier") \ 2311 \ 2312 diagnostic(bool, VerifyRememberedSets, false, \ 2313 "Verify GC remembered sets") \ 2314 \ 2315 diagnostic(bool, VerifyObjectStartArray, true, \ 2316 "Verify GC object start array if verify before/after") \ 2317 \ 2318 product(bool, DisableExplicitGC, false, \ 2319 "Ignore calls to System.gc()") \ 2320 \ 2321 notproduct(bool, CheckMemoryInitialization, false, \ 2322 "Check memory initialization") \ 2323 \ 2324 product(bool, CollectGen0First, false, \ 2325 "Collect youngest generation before each full GC") \ 2326 \ 2327 diagnostic(bool, BindCMSThreadToCPU, false, \ 2328 "Bind CMS Thread to CPU if possible") \ 2329 \ 2330 diagnostic(uintx, CPUForCMSThread, 0, \ 2331 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2332 \ 2333 product(bool, BindGCTaskThreadsToCPUs, false, \ 2334 "Bind GCTaskThreads to CPUs if possible") \ 2335 \ 2336 product(bool, UseGCTaskAffinity, false, \ 2337 "Use worker affinity when asking for GCTasks") \ 2338 \ 2339 product(uintx, ProcessDistributionStride, 4, \ 2340 "Stride through processors when distributing processes") \ 2341 \ 2342 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2343 "Number of times the coordinator GC thread will sleep while " \ 2344 "yielding before giving up and resuming GC") \ 2345 \ 2346 product(uintx, CMSYieldSleepCount, 0, \ 2347 "Number of times a GC thread (minus the coordinator) " \ 2348 "will sleep while yielding before giving up and resuming GC") \ 2349 \ 2350 /* gc tracing */ \ 2351 manageable(bool, PrintGC, false, \ 2352 "Print message at garbage collection") \ 2353 \ 2354 manageable(bool, PrintGCDetails, false, \ 2355 "Print more details at garbage collection") \ 2356 \ 2357 manageable(bool, PrintGCDateStamps, false, \ 2358 "Print date stamps at garbage collection") \ 2359 \ 2360 manageable(bool, PrintGCTimeStamps, false, \ 2361 "Print timestamps at garbage collection") \ 2362 \ 2363 manageable(bool, PrintGCID, false, \ 2364 "Print an identifier for each garbage collection") \ 2365 \ 2366 product(bool, PrintGCTaskTimeStamps, false, \ 2367 "Print timestamps for individual gc worker thread tasks") \ 2368 \ 2369 develop(intx, ConcGCYieldTimeout, 0, \ 2370 "If non-zero, assert that GC threads yield within this " \ 2371 "number of milliseconds") \ 2372 \ 2373 notproduct(bool, TraceMarkSweep, false, \ 2374 "Trace mark sweep") \ 2375 \ 2376 product(bool, PrintReferenceGC, false, \ 2377 "Print times spent handling reference objects during GC " \ 2378 "(enabled only when PrintGCDetails)") \ 2379 \ 2380 develop(bool, TraceReferenceGC, false, \ 2381 "Trace handling of soft/weak/final/phantom references") \ 2382 \ 2383 develop(bool, TraceFinalizerRegistration, false, \ 2384 "Trace registration of final references") \ 2385 \ 2386 notproduct(bool, TraceScavenge, false, \ 2387 "Trace scavenge") \ 2388 \ 2389 product(bool, IgnoreEmptyClassPaths, false, \ 2390 "Ignore empty path elements in -classpath") \ 2391 \ 2392 product(bool, TraceClassPaths, false, \ 2393 "Trace processing of class paths") \ 2394 \ 2395 product_rw(bool, TraceClassLoading, false, \ 2396 "Trace all classes loaded") \ 2397 \ 2398 product(bool, TraceClassLoadingPreorder, false, \ 2399 "Trace all classes loaded in order referenced (not loaded)") \ 2400 \ 2401 product_rw(bool, TraceClassUnloading, false, \ 2402 "Trace unloading of classes") \ 2403 \ 2404 product_rw(bool, TraceLoaderConstraints, false, \ 2405 "Trace loader constraints") \ 2406 \ 2407 develop(bool, TraceClassLoaderData, false, \ 2408 "Trace class loader loader_data lifetime") \ 2409 \ 2410 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2411 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2412 "Initial size of the boot class loader data metaspace") \ 2413 \ 2414 product(bool, TraceGen0Time, false, \ 2415 "Trace accumulated time for Gen 0 collection") \ 2416 \ 2417 product(bool, TraceGen1Time, false, \ 2418 "Trace accumulated time for Gen 1 collection") \ 2419 \ 2420 product(bool, PrintTenuringDistribution, false, \ 2421 "Print tenuring age information") \ 2422 \ 2423 product_rw(bool, PrintHeapAtGC, false, \ 2424 "Print heap layout before and after each GC") \ 2425 \ 2426 product_rw(bool, PrintHeapAtGCExtended, false, \ 2427 "Print extended information about the layout of the heap " \ 2428 "when -XX:+PrintHeapAtGC is set") \ 2429 \ 2430 product(bool, PrintHeapAtSIGBREAK, true, \ 2431 "Print heap layout in response to SIGBREAK") \ 2432 \ 2433 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2434 "Print a class histogram before any major stop-world GC") \ 2435 \ 2436 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2437 "Print a class histogram after any major stop-world GC") \ 2438 \ 2439 manageable(bool, PrintClassHistogram, false, \ 2440 "Print a histogram of class instances") \ 2441 \ 2442 develop(bool, TraceWorkGang, false, \ 2443 "Trace activities of work gangs") \ 2444 \ 2445 product(bool, TraceParallelOldGCTasks, false, \ 2446 "Trace multithreaded GC activity") \ 2447 \ 2448 develop(bool, TraceBlockOffsetTable, false, \ 2449 "Print BlockOffsetTable maps") \ 2450 \ 2451 develop(bool, TraceCardTableModRefBS, false, \ 2452 "Print CardTableModRefBS maps") \ 2453 \ 2454 develop(bool, TraceGCTaskManager, false, \ 2455 "Trace actions of the GC task manager") \ 2456 \ 2457 develop(bool, TraceGCTaskQueue, false, \ 2458 "Trace actions of the GC task queues") \ 2459 \ 2460 diagnostic(bool, TraceGCTaskThread, false, \ 2461 "Trace actions of the GC task threads") \ 2462 \ 2463 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2464 "Print the time taken by each phase in ParallelOldGC " \ 2465 "(PrintGCDetails must also be enabled)") \ 2466 \ 2467 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2468 "Trace marking phase in ParallelOldGC") \ 2469 \ 2470 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2471 "Trace summary phase in ParallelOldGC") \ 2472 \ 2473 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2474 "Trace compaction phase in ParallelOldGC") \ 2475 \ 2476 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2477 "Trace dense prefix computation for ParallelOldGC") \ 2478 \ 2479 develop(bool, IgnoreLibthreadGPFault, false, \ 2480 "Suppress workaround for libthread GP fault") \ 2481 \ 2482 product(bool, PrintJNIGCStalls, false, \ 2483 "Print diagnostic message when GC is stalled " \ 2484 "by JNI critical section") \ 2485 \ 2486 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2487 "The percentage of the used heap that the instances of a class " \ 2488 "must occupy for the class to generate a trace event") \ 2489 \ 2490 /* GC log rotation setting */ \ 2491 \ 2492 product(bool, UseGCLogFileRotation, false, \ 2493 "Rotate gclog files (for long running applications). It requires "\ 2494 "-Xloggc:<filename>") \ 2495 \ 2496 product(uintx, NumberOfGCLogFiles, 0, \ 2497 "Number of gclog files in rotation " \ 2498 "(default: 0, no rotation)") \ 2499 \ 2500 product(uintx, GCLogFileSize, 8*K, \ 2501 "GC log file size, requires UseGCLogFileRotation. " \ 2502 "Set to 0 to only trigger rotation via jcmd") \ 2503 \ 2504 /* JVMTI heap profiling */ \ 2505 \ 2506 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2507 "Trace JVMTI object tagging calls") \ 2508 \ 2509 diagnostic(bool, VerifyBeforeIteration, false, \ 2510 "Verify memory system before JVMTI iteration") \ 2511 \ 2512 /* compiler interface */ \ 2513 \ 2514 develop(bool, CIPrintCompilerName, false, \ 2515 "when CIPrint is active, print the name of the active compiler") \ 2516 \ 2517 develop(bool, CIPrintCompileQueue, false, \ 2518 "display the contents of the compile queue whenever a " \ 2519 "compilation is enqueued") \ 2520 \ 2521 develop(bool, CIPrintRequests, false, \ 2522 "display every request for compilation") \ 2523 \ 2524 product(bool, CITime, false, \ 2525 "collect timing information for compilation") \ 2526 \ 2527 develop(bool, CITimeEach, false, \ 2528 "display timing information after each successful compilation") \ 2529 \ 2530 develop(bool, CICountOSR, false, \ 2531 "use a separate counter when assigning ids to osr compilations") \ 2532 \ 2533 develop(bool, CICompileNatives, true, \ 2534 "compile native methods if supported by the compiler") \ 2535 \ 2536 develop_pd(bool, CICompileOSR, \ 2537 "compile on stack replacement methods if supported by the " \ 2538 "compiler") \ 2539 \ 2540 develop(bool, CIPrintMethodCodes, false, \ 2541 "print method bytecodes of the compiled code") \ 2542 \ 2543 develop(bool, CIPrintTypeFlow, false, \ 2544 "print the results of ciTypeFlow analysis") \ 2545 \ 2546 develop(bool, CITraceTypeFlow, false, \ 2547 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2548 \ 2549 develop(intx, OSROnlyBCI, -1, \ 2550 "OSR only at this bci. Negative values mean exclude that bci") \ 2551 \ 2552 /* compiler */ \ 2553 \ 2554 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2555 "Number of compiler threads to run") \ 2556 \ 2557 product(intx, CompilationPolicyChoice, 0, \ 2558 "which compilation policy (0/1)") \ 2559 \ 2560 develop(bool, UseStackBanging, true, \ 2561 "use stack banging for stack overflow checks (required for " \ 2562 "proper StackOverflow handling; disable only to measure cost " \ 2563 "of stackbanging)") \ 2564 \ 2565 develop(bool, UseStrictFP, true, \ 2566 "use strict fp if modifier strictfp is set") \ 2567 \ 2568 develop(bool, GenerateSynchronizationCode, true, \ 2569 "generate locking/unlocking code for synchronized methods and " \ 2570 "monitors") \ 2571 \ 2572 develop(bool, GenerateCompilerNullChecks, true, \ 2573 "Generate explicit null checks for loads/stores/calls") \ 2574 \ 2575 develop(bool, GenerateRangeChecks, true, \ 2576 "Generate range checks for array accesses") \ 2577 \ 2578 develop_pd(bool, ImplicitNullChecks, \ 2579 "Generate code for implicit null checks") \ 2580 \ 2581 product_pd(bool, TrapBasedNullChecks, \ 2582 "Generate code for null checks that uses a cmp and trap " \ 2583 "instruction raising SIGTRAP. This is only used if an access to" \ 2584 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2585 "ImplicitNullChecks don't work (PPC64).") \ 2586 \ 2587 product(bool, PrintSafepointStatistics, false, \ 2588 "Print statistics about safepoint synchronization") \ 2589 \ 2590 product(intx, PrintSafepointStatisticsCount, 300, \ 2591 "Total number of safepoint statistics collected " \ 2592 "before printing them out") \ 2593 \ 2594 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2595 "Print safepoint statistics only when safepoint takes " \ 2596 "more than PrintSafepointSatisticsTimeout in millis") \ 2597 \ 2598 product(bool, TraceSafepointCleanupTime, false, \ 2599 "Print the break down of clean up tasks performed during " \ 2600 "safepoint") \ 2601 \ 2602 product(bool, Inline, true, \ 2603 "Enable inlining") \ 2604 \ 2605 product(bool, ClipInlining, true, \ 2606 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2607 \ 2608 develop(bool, UseCHA, true, \ 2609 "Enable CHA") \ 2610 \ 2611 product(bool, UseTypeProfile, true, \ 2612 "Check interpreter profile for historically monomorphic calls") \ 2613 \ 2614 notproduct(bool, TimeCompiler, false, \ 2615 "Time the compiler") \ 2616 \ 2617 diagnostic(bool, PrintInlining, false, \ 2618 "Print inlining optimizations") \ 2619 \ 2620 product(bool, UsePopCountInstruction, false, \ 2621 "Use population count instruction") \ 2622 \ 2623 develop(bool, EagerInitialization, false, \ 2624 "Eagerly initialize classes if possible") \ 2625 \ 2626 develop(bool, TraceMethodReplacement, false, \ 2627 "Print when methods are replaced do to recompilation") \ 2628 \ 2629 develop(bool, PrintMethodFlushing, false, \ 2630 "Print the nmethods being flushed") \ 2631 \ 2632 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2633 "print statistics about method flushing") \ 2634 \ 2635 develop(bool, UseRelocIndex, false, \ 2636 "Use an index to speed random access to relocations") \ 2637 \ 2638 develop(bool, StressCodeBuffers, false, \ 2639 "Exercise code buffer expansion and other rare state changes") \ 2640 \ 2641 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2642 "Generate extra debugging information for non-safepoints in " \ 2643 "nmethods") \ 2644 \ 2645 product(bool, PrintVMOptions, false, \ 2646 "Print flags that appeared on the command line") \ 2647 \ 2648 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2649 "Ignore unrecognized VM options") \ 2650 \ 2651 product(bool, PrintCommandLineFlags, false, \ 2652 "Print flags specified on command line or set by ergonomics") \ 2653 \ 2654 product(bool, PrintFlagsInitial, false, \ 2655 "Print all VM flags before argument processing and exit VM") \ 2656 \ 2657 product(bool, PrintFlagsFinal, false, \ 2658 "Print all VM flags after argument and ergonomic processing") \ 2659 \ 2660 notproduct(bool, PrintFlagsWithComments, false, \ 2661 "Print all VM flags with default values and descriptions and " \ 2662 "exit") \ 2663 \ 2664 diagnostic(bool, SerializeVMOutput, true, \ 2665 "Use a mutex to serialize output to tty and LogFile") \ 2666 \ 2667 diagnostic(bool, DisplayVMOutput, true, \ 2668 "Display all VM output on the tty, independently of LogVMOutput") \ 2669 \ 2670 diagnostic(bool, LogVMOutput, false, \ 2671 "Save VM output to LogFile") \ 2672 \ 2673 diagnostic(ccstr, LogFile, NULL, \ 2674 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2675 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2676 \ 2677 product(ccstr, ErrorFile, NULL, \ 2678 "If an error occurs, save the error data to this file " \ 2679 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2680 \ 2681 product(bool, DisplayVMOutputToStderr, false, \ 2682 "If DisplayVMOutput is true, display all VM output to stderr") \ 2683 \ 2684 product(bool, DisplayVMOutputToStdout, false, \ 2685 "If DisplayVMOutput is true, display all VM output to stdout") \ 2686 \ 2687 product(bool, UseHeavyMonitors, false, \ 2688 "use heavyweight instead of lightweight Java monitors") \ 2689 \ 2690 product(bool, PrintStringTableStatistics, false, \ 2691 "print statistics about the StringTable and SymbolTable") \ 2692 \ 2693 diagnostic(bool, VerifyStringTableAtExit, false, \ 2694 "verify StringTable contents at exit") \ 2695 \ 2696 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2697 "print histogram of the symbol table") \ 2698 \ 2699 notproduct(bool, ExitVMOnVerifyError, false, \ 2700 "standard exit from VM if bytecode verify error " \ 2701 "(only in debug mode)") \ 2702 \ 2703 notproduct(ccstr, AbortVMOnException, NULL, \ 2704 "Call fatal if this exception is thrown. Example: " \ 2705 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2706 \ 2707 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2708 "Call fatal if the exception pointed by AbortVMOnException " \ 2709 "has this message") \ 2710 \ 2711 develop(bool, DebugVtables, false, \ 2712 "add debugging code to vtable dispatch") \ 2713 \ 2714 develop(bool, PrintVtables, false, \ 2715 "print vtables when printing klass") \ 2716 \ 2717 notproduct(bool, PrintVtableStats, false, \ 2718 "print vtables stats at end of run") \ 2719 \ 2720 develop(bool, TraceCreateZombies, false, \ 2721 "trace creation of zombie nmethods") \ 2722 \ 2723 notproduct(bool, IgnoreLockingAssertions, false, \ 2724 "disable locking assertions (for speed)") \ 2725 \ 2726 product(bool, RangeCheckElimination, true, \ 2727 "Eliminate range checks") \ 2728 \ 2729 develop_pd(bool, UncommonNullCast, \ 2730 "track occurrences of null in casts; adjust compiler tactics") \ 2731 \ 2732 develop(bool, TypeProfileCasts, true, \ 2733 "treat casts like calls for purposes of type profiling") \ 2734 \ 2735 develop(bool, DelayCompilationDuringStartup, true, \ 2736 "Delay invoking the compiler until main application class is " \ 2737 "loaded") \ 2738 \ 2739 develop(bool, CompileTheWorld, false, \ 2740 "Compile all methods in all classes in bootstrap class path " \ 2741 "(stress test)") \ 2742 \ 2743 develop(bool, CompileTheWorldPreloadClasses, true, \ 2744 "Preload all classes used by a class before start loading") \ 2745 \ 2746 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2747 "Force a safepoint every n compiles so sweeper can keep up") \ 2748 \ 2749 develop(bool, FillDelaySlots, true, \ 2750 "Fill delay slots (on SPARC only)") \ 2751 \ 2752 develop(bool, TimeLivenessAnalysis, false, \ 2753 "Time computation of bytecode liveness analysis") \ 2754 \ 2755 develop(bool, TraceLivenessGen, false, \ 2756 "Trace the generation of liveness analysis information") \ 2757 \ 2758 notproduct(bool, TraceLivenessQuery, false, \ 2759 "Trace queries of liveness analysis information") \ 2760 \ 2761 notproduct(bool, CollectIndexSetStatistics, false, \ 2762 "Collect information about IndexSets") \ 2763 \ 2764 develop(bool, UseLoopSafepoints, true, \ 2765 "Generate Safepoint nodes in every loop") \ 2766 \ 2767 develop(intx, FastAllocateSizeLimit, 128*K, \ 2768 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2769 "Inline allocations larger than this in doublewords must go slow")\ 2770 \ 2771 product(bool, AggressiveOpts, false, \ 2772 "Enable aggressive optimizations - see arguments.cpp") \ 2773 \ 2774 product_pd(uintx, TypeProfileLevel, \ 2775 "=XYZ, with Z: Type profiling of arguments at call; " \ 2776 "Y: Type profiling of return value at call; " \ 2777 "X: Type profiling of parameters to methods; " \ 2778 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2779 \ 2780 product(intx, TypeProfileArgsLimit, 2, \ 2781 "max number of call arguments to consider for type profiling") \ 2782 \ 2783 product(intx, TypeProfileParmsLimit, 2, \ 2784 "max number of incoming parameters to consider for type profiling"\ 2785 ", -1 for all") \ 2786 \ 2787 /* statistics */ \ 2788 develop(bool, CountCompiledCalls, false, \ 2789 "Count method invocations") \ 2790 \ 2791 notproduct(bool, CountRuntimeCalls, false, \ 2792 "Count VM runtime calls") \ 2793 \ 2794 develop(bool, CountJNICalls, false, \ 2795 "Count jni method invocations") \ 2796 \ 2797 notproduct(bool, CountJVMCalls, false, \ 2798 "Count jvm method invocations") \ 2799 \ 2800 notproduct(bool, CountRemovableExceptions, false, \ 2801 "Count exceptions that could be replaced by branches due to " \ 2802 "inlining") \ 2803 \ 2804 notproduct(bool, ICMissHistogram, false, \ 2805 "Produce histogram of IC misses") \ 2806 \ 2807 notproduct(bool, PrintClassStatistics, false, \ 2808 "Print class statistics at end of run") \ 2809 \ 2810 notproduct(bool, PrintMethodStatistics, false, \ 2811 "Print method statistics at end of run") \ 2812 \ 2813 /* interpreter */ \ 2814 develop(bool, ClearInterpreterLocals, false, \ 2815 "Always clear local variables of interpreter activations upon " \ 2816 "entry") \ 2817 \ 2818 product_pd(bool, RewriteBytecodes, \ 2819 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2820 \ 2821 product_pd(bool, RewriteFrequentPairs, \ 2822 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2823 \ 2824 diagnostic(bool, PrintInterpreter, false, \ 2825 "Print the generated interpreter code") \ 2826 \ 2827 product(bool, UseInterpreter, true, \ 2828 "Use interpreter for non-compiled methods") \ 2829 \ 2830 develop(bool, UseFastSignatureHandlers, true, \ 2831 "Use fast signature handlers for native calls") \ 2832 \ 2833 product(bool, UseLoopCounter, true, \ 2834 "Increment invocation counter on backward branch") \ 2835 \ 2836 product(bool, UseFastEmptyMethods, true, \ 2837 "Use fast method entry code for empty methods") \ 2838 \ 2839 product(bool, UseFastAccessorMethods, true, \ 2840 "Use fast method entry code for accessor methods") \ 2841 \ 2842 product_pd(bool, UseOnStackReplacement, \ 2843 "Use on stack replacement, calls runtime if invoc. counter " \ 2844 "overflows in loop") \ 2845 \ 2846 notproduct(bool, TraceOnStackReplacement, false, \ 2847 "Trace on stack replacement") \ 2848 \ 2849 product_pd(bool, PreferInterpreterNativeStubs, \ 2850 "Use always interpreter stubs for native methods invoked via " \ 2851 "interpreter") \ 2852 \ 2853 develop(bool, CountBytecodes, false, \ 2854 "Count number of bytecodes executed") \ 2855 \ 2856 develop(bool, PrintBytecodeHistogram, false, \ 2857 "Print histogram of the executed bytecodes") \ 2858 \ 2859 develop(bool, PrintBytecodePairHistogram, false, \ 2860 "Print histogram of the executed bytecode pairs") \ 2861 \ 2862 diagnostic(bool, PrintSignatureHandlers, false, \ 2863 "Print code generated for native method signature handlers") \ 2864 \ 2865 develop(bool, VerifyOops, false, \ 2866 "Do plausibility checks for oops") \ 2867 \ 2868 develop(bool, CheckUnhandledOops, false, \ 2869 "Check for unhandled oops in VM code") \ 2870 \ 2871 develop(bool, VerifyJNIFields, trueInDebug, \ 2872 "Verify jfieldIDs for instance fields") \ 2873 \ 2874 notproduct(bool, VerifyJNIEnvThread, false, \ 2875 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2876 "from JNI") \ 2877 \ 2878 develop(bool, VerifyFPU, false, \ 2879 "Verify FPU state (check for NaN's, etc.)") \ 2880 \ 2881 develop(bool, VerifyThread, false, \ 2882 "Watch the thread register for corruption (SPARC only)") \ 2883 \ 2884 develop(bool, VerifyActivationFrameSize, false, \ 2885 "Verify that activation frame didn't become smaller than its " \ 2886 "minimal size") \ 2887 \ 2888 develop(bool, TraceFrequencyInlining, false, \ 2889 "Trace frequency based inlining") \ 2890 \ 2891 develop_pd(bool, InlineIntrinsics, \ 2892 "Inline intrinsics that can be statically resolved") \ 2893 \ 2894 product_pd(bool, ProfileInterpreter, \ 2895 "Profile at the bytecode level during interpretation") \ 2896 \ 2897 develop(bool, TraceProfileInterpreter, false, \ 2898 "Trace profiling at the bytecode level during interpretation. " \ 2899 "This outputs the profiling information collected to improve " \ 2900 "jit compilation.") \ 2901 \ 2902 develop_pd(bool, ProfileTraps, \ 2903 "Profile deoptimization traps at the bytecode level") \ 2904 \ 2905 product(intx, ProfileMaturityPercentage, 20, \ 2906 "number of method invocations/branches (expressed as % of " \ 2907 "CompileThreshold) before using the method's profile") \ 2908 \ 2909 develop(bool, PrintMethodData, false, \ 2910 "Print the results of +ProfileInterpreter at end of run") \ 2911 \ 2912 develop(bool, VerifyDataPointer, trueInDebug, \ 2913 "Verify the method data pointer during interpreter profiling") \ 2914 \ 2915 develop(bool, VerifyCompiledCode, false, \ 2916 "Include miscellaneous runtime verifications in nmethod code; " \ 2917 "default off because it disturbs nmethod size heuristics") \ 2918 \ 2919 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2920 "Manually make GC thread crash then dump java stack trace; " \ 2921 "Test only") \ 2922 \ 2923 /* compilation */ \ 2924 product(bool, UseCompiler, true, \ 2925 "Use Just-In-Time compilation") \ 2926 \ 2927 develop(bool, TraceCompilationPolicy, false, \ 2928 "Trace compilation policy") \ 2929 \ 2930 develop(bool, TimeCompilationPolicy, false, \ 2931 "Time the compilation policy") \ 2932 \ 2933 product(bool, UseCounterDecay, true, \ 2934 "Adjust recompilation counters") \ 2935 \ 2936 develop(intx, CounterHalfLifeTime, 30, \ 2937 "Half-life time of invocation counters (in seconds)") \ 2938 \ 2939 develop(intx, CounterDecayMinIntervalLength, 500, \ 2940 "The minimum interval (in milliseconds) between invocation of " \ 2941 "CounterDecay") \ 2942 \ 2943 product(bool, AlwaysCompileLoopMethods, false, \ 2944 "When using recompilation, never interpret methods " \ 2945 "containing loops") \ 2946 \ 2947 product(bool, DontCompileHugeMethods, true, \ 2948 "Do not compile methods > HugeMethodLimit") \ 2949 \ 2950 /* Bytecode escape analysis estimation. */ \ 2951 product(bool, EstimateArgEscape, true, \ 2952 "Analyze bytecodes to estimate escape state of arguments") \ 2953 \ 2954 product(intx, BCEATraceLevel, 0, \ 2955 "How much tracing to do of bytecode escape analysis estimates") \ 2956 \ 2957 product(intx, MaxBCEAEstimateLevel, 5, \ 2958 "Maximum number of nested calls that are analyzed by BC EA") \ 2959 \ 2960 product(intx, MaxBCEAEstimateSize, 150, \ 2961 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2962 \ 2963 product(intx, AllocatePrefetchStyle, 1, \ 2964 "0 = no prefetch, " \ 2965 "1 = prefetch instructions for each allocation, " \ 2966 "2 = use TLAB watermark to gate allocation prefetch, " \ 2967 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2968 \ 2969 product(intx, AllocatePrefetchDistance, -1, \ 2970 "Distance to prefetch ahead of allocation pointer") \ 2971 \ 2972 product(intx, AllocatePrefetchLines, 3, \ 2973 "Number of lines to prefetch ahead of array allocation pointer") \ 2974 \ 2975 product(intx, AllocateInstancePrefetchLines, 1, \ 2976 "Number of lines to prefetch ahead of instance allocation " \ 2977 "pointer") \ 2978 \ 2979 product(intx, AllocatePrefetchStepSize, 16, \ 2980 "Step size in bytes of sequential prefetch instructions") \ 2981 \ 2982 product(intx, AllocatePrefetchInstr, 0, \ 2983 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2984 \ 2985 /* deoptimization */ \ 2986 develop(bool, TraceDeoptimization, false, \ 2987 "Trace deoptimization") \ 2988 \ 2989 develop(bool, DebugDeoptimization, false, \ 2990 "Tracing various information while debugging deoptimization") \ 2991 \ 2992 product(intx, SelfDestructTimer, 0, \ 2993 "Will cause VM to terminate after a given time (in minutes) " \ 2994 "(0 means off)") \ 2995 \ 2996 product(intx, MaxJavaStackTraceDepth, 1024, \ 2997 "The maximum number of lines in the stack trace for Java " \ 2998 "exceptions (0 means all)") \ 2999 \ 3000 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3001 "Guarantee a safepoint (at least) every so many milliseconds " \ 3002 "(0 means none)")) \ 3003 \ 3004 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3005 "Guarantee a safepoint (at least) every so many milliseconds " \ 3006 "(0 means none)")) \ 3007 \ 3008 product(intx, SafepointTimeoutDelay, 10000, \ 3009 "Delay in milliseconds for option SafepointTimeout") \ 3010 \ 3011 product(intx, NmethodSweepFraction, 16, \ 3012 "Number of invocations of sweeper to cover all nmethods") \ 3013 \ 3014 product(intx, NmethodSweepCheckInterval, 5, \ 3015 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3016 \ 3017 product(intx, NmethodSweepActivity, 10, \ 3018 "Removes cold nmethods from code cache if > 0. Higher values " \ 3019 "result in more aggressive sweeping") \ 3020 \ 3021 notproduct(bool, LogSweeper, false, \ 3022 "Keep a ring buffer of sweeper activity") \ 3023 \ 3024 notproduct(intx, SweeperLogEntries, 1024, \ 3025 "Number of records in the ring buffer of sweeper activity") \ 3026 \ 3027 notproduct(intx, MemProfilingInterval, 500, \ 3028 "Time between each invocation of the MemProfiler") \ 3029 \ 3030 develop(intx, MallocCatchPtr, -1, \ 3031 "Hit breakpoint when mallocing/freeing this pointer") \ 3032 \ 3033 notproduct(intx, AssertRepeat, 1, \ 3034 "number of times to evaluate expression in assert " \ 3035 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3036 \ 3037 notproduct(ccstrlist, SuppressErrorAt, "", \ 3038 "List of assertions (file:line) to muzzle") \ 3039 \ 3040 notproduct(uintx, HandleAllocationLimit, 1024, \ 3041 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3042 "is used") \ 3043 \ 3044 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3045 "Threshold for total handle allocation when " \ 3046 "+TraceHandleAllocation is used") \ 3047 \ 3048 develop(intx, StackPrintLimit, 100, \ 3049 "number of stack frames to print in VM-level stack dump") \ 3050 \ 3051 notproduct(intx, MaxElementPrintSize, 256, \ 3052 "maximum number of elements to print") \ 3053 \ 3054 notproduct(intx, MaxSubklassPrintSize, 4, \ 3055 "maximum number of subklasses to print when printing klass") \ 3056 \ 3057 product(intx, MaxInlineLevel, 9, \ 3058 "maximum number of nested calls that are inlined") \ 3059 \ 3060 product(intx, MaxRecursiveInlineLevel, 1, \ 3061 "maximum number of nested recursive calls that are inlined") \ 3062 \ 3063 develop(intx, MaxForceInlineLevel, 100, \ 3064 "maximum number of nested calls that are forced for inlining " \ 3065 "(using CompilerOracle or marked w/ @ForceInline)") \ 3066 \ 3067 product_pd(intx, InlineSmallCode, \ 3068 "Only inline already compiled methods if their code size is " \ 3069 "less than this") \ 3070 \ 3071 product(intx, MaxInlineSize, 35, \ 3072 "The maximum bytecode size of a method to be inlined") \ 3073 \ 3074 product_pd(intx, FreqInlineSize, \ 3075 "The maximum bytecode size of a frequent method to be inlined") \ 3076 \ 3077 product(intx, MaxTrivialSize, 6, \ 3078 "The maximum bytecode size of a trivial method to be inlined") \ 3079 \ 3080 product(intx, MinInliningThreshold, 250, \ 3081 "The minimum invocation count a method needs to have to be " \ 3082 "inlined") \ 3083 \ 3084 develop(intx, MethodHistogramCutoff, 100, \ 3085 "The cutoff value for method invocation histogram (+CountCalls)") \ 3086 \ 3087 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3088 "Number of interpreted methods to show in profile") \ 3089 \ 3090 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3091 "Number of compiled methods to show in profile") \ 3092 \ 3093 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3094 "Number of stub methods to show in profile") \ 3095 \ 3096 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3097 "Number of runtime stub nodes to show in profile") \ 3098 \ 3099 product(intx, ProfileIntervalsTicks, 100, \ 3100 "Number of ticks between printing of interval profile " \ 3101 "(+ProfileIntervals)") \ 3102 \ 3103 notproduct(intx, ScavengeALotInterval, 1, \ 3104 "Interval between which scavenge will occur with +ScavengeALot") \ 3105 \ 3106 notproduct(intx, FullGCALotInterval, 1, \ 3107 "Interval between which full gc will occur with +FullGCALot") \ 3108 \ 3109 notproduct(intx, FullGCALotStart, 0, \ 3110 "For which invocation to start FullGCAlot") \ 3111 \ 3112 notproduct(intx, FullGCALotDummies, 32*K, \ 3113 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3114 "to move") \ 3115 \ 3116 develop(intx, DontYieldALotInterval, 10, \ 3117 "Interval between which yields will be dropped (milliseconds)") \ 3118 \ 3119 develop(intx, MinSleepInterval, 1, \ 3120 "Minimum sleep() interval (milliseconds) when " \ 3121 "ConvertSleepToYield is off (used for Solaris)") \ 3122 \ 3123 develop(intx, ProfilerPCTickThreshold, 15, \ 3124 "Number of ticks in a PC buckets to be a hotspot") \ 3125 \ 3126 notproduct(intx, DeoptimizeALotInterval, 5, \ 3127 "Number of exits until DeoptimizeALot kicks in") \ 3128 \ 3129 notproduct(intx, ZombieALotInterval, 5, \ 3130 "Number of exits until ZombieALot kicks in") \ 3131 \ 3132 diagnostic(intx, MallocVerifyInterval, 0, \ 3133 "If non-zero, verify C heap after every N calls to " \ 3134 "malloc/realloc/free") \ 3135 \ 3136 diagnostic(intx, MallocVerifyStart, 0, \ 3137 "If non-zero, start verifying C heap after Nth call to " \ 3138 "malloc/realloc/free") \ 3139 \ 3140 diagnostic(uintx, MallocMaxTestWords, 0, \ 3141 "If non-zero, maximum number of words that malloc/realloc can " \ 3142 "allocate (for testing only)") \ 3143 \ 3144 product(intx, TypeProfileWidth, 2, \ 3145 "Number of receiver types to record in call/cast profile") \ 3146 \ 3147 develop(intx, BciProfileWidth, 2, \ 3148 "Number of return bci's to record in ret profile") \ 3149 \ 3150 product(intx, PerMethodRecompilationCutoff, 400, \ 3151 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3152 \ 3153 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3154 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3155 \ 3156 product(intx, PerMethodTrapLimit, 100, \ 3157 "Limit on traps (of one kind) in a method (includes inlines)") \ 3158 \ 3159 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3160 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3161 \ 3162 product(intx, PerBytecodeTrapLimit, 4, \ 3163 "Limit on traps (of one kind) at a particular BCI") \ 3164 \ 3165 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3166 "Extra method data trap entries for speculation") \ 3167 \ 3168 develop(intx, InlineFrequencyRatio, 20, \ 3169 "Ratio of call site execution to caller method invocation") \ 3170 \ 3171 develop_pd(intx, InlineFrequencyCount, \ 3172 "Count of call site execution necessary to trigger frequent " \ 3173 "inlining") \ 3174 \ 3175 develop(intx, InlineThrowCount, 50, \ 3176 "Force inlining of interpreted methods that throw this often") \ 3177 \ 3178 develop(intx, InlineThrowMaxSize, 200, \ 3179 "Force inlining of throwing methods smaller than this") \ 3180 \ 3181 develop(intx, ProfilerNodeSize, 1024, \ 3182 "Size in K to allocate for the Profile Nodes of each thread") \ 3183 \ 3184 product_pd(intx, PreInflateSpin, \ 3185 "Number of times to spin wait before inflation") \ 3186 \ 3187 /* gc parameters */ \ 3188 product(uintx, InitialHeapSize, 0, \ 3189 "Initial heap size (in bytes); zero means use ergonomics") \ 3190 \ 3191 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3192 "Maximum heap size (in bytes)") \ 3193 \ 3194 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3195 "Initial tenured generation size (in bytes)") \ 3196 \ 3197 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3198 "Initial new generation size (in bytes)") \ 3199 \ 3200 product(uintx, MaxNewSize, max_uintx, \ 3201 "Maximum new generation size (in bytes), max_uintx means set " \ 3202 "ergonomically") \ 3203 \ 3204 product(uintx, PretenureSizeThreshold, 0, \ 3205 "Maximum size in bytes of objects allocated in DefNew " \ 3206 "generation; zero means no maximum") \ 3207 \ 3208 product(uintx, TLABSize, 0, \ 3209 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3210 \ 3211 product(uintx, MinTLABSize, 2*K, \ 3212 "Minimum allowed TLAB size (in bytes)") \ 3213 \ 3214 product(uintx, TLABAllocationWeight, 35, \ 3215 "Allocation averaging weight") \ 3216 \ 3217 product(uintx, TLABWasteTargetPercent, 1, \ 3218 "Percentage of Eden that can be wasted") \ 3219 \ 3220 product(uintx, TLABRefillWasteFraction, 64, \ 3221 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3222 \ 3223 product(uintx, TLABWasteIncrement, 4, \ 3224 "Increment allowed waste at slow allocation") \ 3225 \ 3226 product(uintx, SurvivorRatio, 8, \ 3227 "Ratio of eden/survivor space size") \ 3228 \ 3229 product(uintx, NewRatio, 2, \ 3230 "Ratio of old/new generation sizes") \ 3231 \ 3232 product_pd(uintx, NewSizeThreadIncrease, \ 3233 "Additional size added to desired new generation size per " \ 3234 "non-daemon thread (in bytes)") \ 3235 \ 3236 product_pd(uintx, MetaspaceSize, \ 3237 "Initial size of Metaspaces (in bytes)") \ 3238 \ 3239 product(uintx, MaxMetaspaceSize, max_uintx, \ 3240 "Maximum size of Metaspaces (in bytes)") \ 3241 \ 3242 product(uintx, CompressedClassSpaceSize, 1*G, \ 3243 "Maximum size of class area in Metaspace when compressed " \ 3244 "class pointers are used") \ 3245 \ 3246 manageable(uintx, MinHeapFreeRatio, 40, \ 3247 "The minimum percentage of heap free after GC to avoid expansion."\ 3248 " For most GCs this applies to the old generation. In G1 and" \ 3249 " ParallelGC it applies to the whole heap.") \ 3250 \ 3251 manageable(uintx, MaxHeapFreeRatio, 70, \ 3252 "The maximum percentage of heap free after GC to avoid shrinking."\ 3253 " For most GCs this applies to the old generation. In G1 and" \ 3254 " ParallelGC it applies to the whole heap.") \ 3255 \ 3256 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3257 "Number of milliseconds per MB of free space in the heap") \ 3258 \ 3259 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3260 "The minimum change in heap space due to GC (in bytes)") \ 3261 \ 3262 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3263 "The minimum expansion of Metaspace (in bytes)") \ 3264 \ 3265 product(uintx, MinMetaspaceFreeRatio, 40, \ 3266 "The minimum percentage of Metaspace free after GC to avoid " \ 3267 "expansion") \ 3268 \ 3269 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3270 "The maximum percentage of Metaspace free after GC to avoid " \ 3271 "shrinking") \ 3272 \ 3273 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3274 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3275 \ 3276 product(uintx, QueuedAllocationWarningCount, 0, \ 3277 "Number of times an allocation that queues behind a GC " \ 3278 "will retry before printing a warning") \ 3279 \ 3280 diagnostic(uintx, VerifyGCStartAt, 0, \ 3281 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3282 \ 3283 diagnostic(intx, VerifyGCLevel, 0, \ 3284 "Generation level at which to start +VerifyBefore/AfterGC") \ 3285 \ 3286 product(uintx, MaxTenuringThreshold, 15, \ 3287 "Maximum value for tenuring threshold") \ 3288 \ 3289 product(uintx, InitialTenuringThreshold, 7, \ 3290 "Initial value for tenuring threshold") \ 3291 \ 3292 product(uintx, TargetSurvivorRatio, 50, \ 3293 "Desired percentage of survivor space used after scavenge") \ 3294 \ 3295 product(uintx, MarkSweepDeadRatio, 5, \ 3296 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3297 "Serial mark sweep treats this as both the minimum and maximum " \ 3298 "value. " \ 3299 "CMS uses this value only if it falls back to mark sweep. " \ 3300 "Par compact uses a variable scale based on the density of the " \ 3301 "generation and treats this as the maximum value when the heap " \ 3302 "is either completely full or completely empty. Par compact " \ 3303 "also has a smaller default value; see arguments.cpp.") \ 3304 \ 3305 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3306 "How often should we fully compact the heap (ignoring the dead " \ 3307 "space parameters)") \ 3308 \ 3309 product(intx, PrintCMSStatistics, 0, \ 3310 "Statistics for CMS") \ 3311 \ 3312 product(bool, PrintCMSInitiationStatistics, false, \ 3313 "Statistics for initiating a CMS collection") \ 3314 \ 3315 product(intx, PrintFLSStatistics, 0, \ 3316 "Statistics for CMS' FreeListSpace") \ 3317 \ 3318 product(intx, PrintFLSCensus, 0, \ 3319 "Census for CMS' FreeListSpace") \ 3320 \ 3321 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3322 "Delay between expansion and allocation (in milliseconds)") \ 3323 \ 3324 develop(uintx, GCWorkerDelayMillis, 0, \ 3325 "Delay in scheduling GC workers (in milliseconds)") \ 3326 \ 3327 product(intx, DeferThrSuspendLoopCount, 4000, \ 3328 "(Unstable) Number of times to iterate in safepoint loop " \ 3329 "before blocking VM threads ") \ 3330 \ 3331 product(intx, DeferPollingPageLoopCount, -1, \ 3332 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3333 "before changing safepoint polling page to RO ") \ 3334 \ 3335 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3336 \ 3337 product(bool, PSChunkLargeArrays, true, \ 3338 "Process large arrays in chunks") \ 3339 \ 3340 product(uintx, GCDrainStackTargetSize, 64, \ 3341 "Number of entries we will try to leave on the stack " \ 3342 "during parallel gc") \ 3343 \ 3344 /* stack parameters */ \ 3345 product_pd(intx, StackYellowPages, \ 3346 "Number of yellow zone (recoverable overflows) pages") \ 3347 \ 3348 product_pd(intx, StackRedPages, \ 3349 "Number of red zone (unrecoverable overflows) pages") \ 3350 \ 3351 product_pd(intx, StackShadowPages, \ 3352 "Number of shadow zone (for overflow checking) pages " \ 3353 "this should exceed the depth of the VM and native call stack") \ 3354 \ 3355 product_pd(intx, ThreadStackSize, \ 3356 "Thread Stack Size (in Kbytes)") \ 3357 \ 3358 product_pd(intx, VMThreadStackSize, \ 3359 "Non-Java Thread Stack Size (in Kbytes)") \ 3360 \ 3361 product_pd(intx, CompilerThreadStackSize, \ 3362 "Compiler Thread Stack Size (in Kbytes)") \ 3363 \ 3364 develop_pd(uintx, JVMInvokeMethodSlack, \ 3365 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3366 \ 3367 product(uintx, ThreadSafetyMargin, 50*M, \ 3368 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3369 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3370 "disable this feature") \ 3371 \ 3372 /* code cache parameters */ \ 3373 /* ppc64 has large code-entry alignment. */ \ 3374 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64), \ 3375 "Code cache segment size (in bytes) - smallest unit of " \ 3376 "allocation") \ 3377 \ 3378 develop_pd(intx, CodeEntryAlignment, \ 3379 "Code entry alignment for generated code (in bytes)") \ 3380 \ 3381 product_pd(intx, OptoLoopAlignment, \ 3382 "Align inner loops to zero relative to this modulus") \ 3383 \ 3384 product_pd(uintx, InitialCodeCacheSize, \ 3385 "Initial code cache size (in bytes)") \ 3386 \ 3387 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3388 "Minimum code cache size (in bytes) required to start VM.") \ 3389 \ 3390 product_pd(uintx, ReservedCodeCacheSize, \ 3391 "Reserved code cache size (in bytes) - maximum code cache size") \ 3392 \ 3393 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3394 "When less than X space left, we stop compiling") \ 3395 \ 3396 product_pd(uintx, CodeCacheExpansionSize, \ 3397 "Code cache expansion size (in bytes)") \ 3398 \ 3399 develop_pd(uintx, CodeCacheMinBlockLength, \ 3400 "Minimum number of segments in a code cache block") \ 3401 \ 3402 notproduct(bool, ExitOnFullCodeCache, false, \ 3403 "Exit the VM if we fill the code cache") \ 3404 \ 3405 product(bool, UseCodeCacheFlushing, true, \ 3406 "Remove cold/old nmethods from the code cache") \ 3407 \ 3408 /* interpreter debugging */ \ 3409 develop(intx, BinarySwitchThreshold, 5, \ 3410 "Minimal number of lookupswitch entries for rewriting to binary " \ 3411 "switch") \ 3412 \ 3413 develop(intx, StopInterpreterAt, 0, \ 3414 "Stop interpreter execution at specified bytecode number") \ 3415 \ 3416 develop(intx, TraceBytecodesAt, 0, \ 3417 "Trace bytecodes starting with specified bytecode number") \ 3418 \ 3419 /* compiler interface */ \ 3420 develop(intx, CIStart, 0, \ 3421 "The id of the first compilation to permit") \ 3422 \ 3423 develop(intx, CIStop, max_jint, \ 3424 "The id of the last compilation to permit") \ 3425 \ 3426 develop(intx, CIStartOSR, 0, \ 3427 "The id of the first osr compilation to permit " \ 3428 "(CICountOSR must be on)") \ 3429 \ 3430 develop(intx, CIStopOSR, max_jint, \ 3431 "The id of the last osr compilation to permit " \ 3432 "(CICountOSR must be on)") \ 3433 \ 3434 develop(intx, CIBreakAtOSR, -1, \ 3435 "The id of osr compilation to break at") \ 3436 \ 3437 develop(intx, CIBreakAt, -1, \ 3438 "The id of compilation to break at") \ 3439 \ 3440 product(ccstrlist, CompileOnly, "", \ 3441 "List of methods (pkg/class.name) to restrict compilation to") \ 3442 \ 3443 product(ccstr, CompileCommandFile, NULL, \ 3444 "Read compiler commands from this file [.hotspot_compiler]") \ 3445 \ 3446 product(ccstrlist, CompileCommand, "", \ 3447 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3448 \ 3449 develop(bool, ReplayCompiles, false, \ 3450 "Enable replay of compilations from ReplayDataFile") \ 3451 \ 3452 product(ccstr, ReplayDataFile, NULL, \ 3453 "File containing compilation replay information" \ 3454 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3455 \ 3456 product(ccstr, InlineDataFile, NULL, \ 3457 "File containing inlining replay information" \ 3458 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3459 \ 3460 develop(intx, ReplaySuppressInitializers, 2, \ 3461 "Control handling of class initialization during replay: " \ 3462 "0 - don't do anything special; " \ 3463 "1 - treat all class initializers as empty; " \ 3464 "2 - treat class initializers for application classes as empty; " \ 3465 "3 - allow all class initializers to run during bootstrap but " \ 3466 " pretend they are empty after starting replay") \ 3467 \ 3468 develop(bool, ReplayIgnoreInitErrors, false, \ 3469 "Ignore exceptions thrown during initialization for replay") \ 3470 \ 3471 product(bool, DumpReplayDataOnError, true, \ 3472 "Record replay data for crashing compiler threads") \ 3473 \ 3474 product(bool, CICompilerCountPerCPU, false, \ 3475 "1 compiler thread for log(N CPUs)") \ 3476 \ 3477 develop(intx, CIFireOOMAt, -1, \ 3478 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3479 "(non-negative value throws OOM after this many CI accesses " \ 3480 "in each compile)") \ 3481 notproduct(intx, CICrashAt, -1, \ 3482 "id of compilation to trigger assert in compiler thread for " \ 3483 "the purpose of testing, e.g. generation of replay data") \ 3484 notproduct(bool, CIObjectFactoryVerify, false, \ 3485 "enable potentially expensive verification in ciObjectFactory") \ 3486 \ 3487 /* Priorities */ \ 3488 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3489 \ 3490 product(intx, ThreadPriorityPolicy, 0, \ 3491 "0 : Normal. "\ 3492 " VM chooses priorities that are appropriate for normal "\ 3493 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3494 " to normal native priority. Java priorities below " \ 3495 " NORM_PRIORITY map to lower native priority values. On "\ 3496 " Windows applications are allowed to use higher native "\ 3497 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3498 " not use the highest possible native priority, "\ 3499 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3500 " system threads. On Linux thread priorities are ignored "\ 3501 " because the OS does not support static priority in "\ 3502 " SCHED_OTHER scheduling class which is the only choice for "\ 3503 " non-root, non-realtime applications. "\ 3504 "1 : Aggressive. "\ 3505 " Java thread priorities map over to the entire range of "\ 3506 " native thread priorities. Higher Java thread priorities map "\ 3507 " to higher native thread priorities. This policy should be "\ 3508 " used with care, as sometimes it can cause performance "\ 3509 " degradation in the application and/or the entire system. On "\ 3510 " Linux this policy requires root privilege.") \ 3511 \ 3512 product(bool, ThreadPriorityVerbose, false, \ 3513 "Print priority changes") \ 3514 \ 3515 product(intx, DefaultThreadPriority, -1, \ 3516 "The native priority at which threads run if not elsewhere " \ 3517 "specified (-1 means no change)") \ 3518 \ 3519 product(intx, CompilerThreadPriority, -1, \ 3520 "The native priority at which compiler threads should run " \ 3521 "(-1 means no change)") \ 3522 \ 3523 product(intx, VMThreadPriority, -1, \ 3524 "The native priority at which the VM thread should run " \ 3525 "(-1 means no change)") \ 3526 \ 3527 product(bool, CompilerThreadHintNoPreempt, true, \ 3528 "(Solaris only) Give compiler threads an extra quanta") \ 3529 \ 3530 product(bool, VMThreadHintNoPreempt, false, \ 3531 "(Solaris only) Give VM thread an extra quanta") \ 3532 \ 3533 product(intx, JavaPriority1_To_OSPriority, -1, \ 3534 "Map Java priorities to OS priorities") \ 3535 \ 3536 product(intx, JavaPriority2_To_OSPriority, -1, \ 3537 "Map Java priorities to OS priorities") \ 3538 \ 3539 product(intx, JavaPriority3_To_OSPriority, -1, \ 3540 "Map Java priorities to OS priorities") \ 3541 \ 3542 product(intx, JavaPriority4_To_OSPriority, -1, \ 3543 "Map Java priorities to OS priorities") \ 3544 \ 3545 product(intx, JavaPriority5_To_OSPriority, -1, \ 3546 "Map Java priorities to OS priorities") \ 3547 \ 3548 product(intx, JavaPriority6_To_OSPriority, -1, \ 3549 "Map Java priorities to OS priorities") \ 3550 \ 3551 product(intx, JavaPriority7_To_OSPriority, -1, \ 3552 "Map Java priorities to OS priorities") \ 3553 \ 3554 product(intx, JavaPriority8_To_OSPriority, -1, \ 3555 "Map Java priorities to OS priorities") \ 3556 \ 3557 product(intx, JavaPriority9_To_OSPriority, -1, \ 3558 "Map Java priorities to OS priorities") \ 3559 \ 3560 product(intx, JavaPriority10_To_OSPriority,-1, \ 3561 "Map Java priorities to OS priorities") \ 3562 \ 3563 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3564 "Java thread priority 10 maps to critical scheduling priority") \ 3565 \ 3566 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3567 "Compiler thread(s) run at critical scheduling priority") \ 3568 \ 3569 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3570 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3571 \ 3572 /* compiler debugging */ \ 3573 notproduct(intx, CompileTheWorldStartAt, 1, \ 3574 "First class to consider when using +CompileTheWorld") \ 3575 \ 3576 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3577 "Last class to consider when using +CompileTheWorld") \ 3578 \ 3579 develop(intx, NewCodeParameter, 0, \ 3580 "Testing Only: Create a dedicated integer parameter before " \ 3581 "putback") \ 3582 \ 3583 /* new oopmap storage allocation */ \ 3584 develop(intx, MinOopMapAllocation, 8, \ 3585 "Minimum number of OopMap entries in an OopMapSet") \ 3586 \ 3587 /* Background Compilation */ \ 3588 develop(intx, LongCompileThreshold, 50, \ 3589 "Used with +TraceLongCompiles") \ 3590 \ 3591 product(intx, StarvationMonitorInterval, 200, \ 3592 "Pause between each check (in milliseconds)") \ 3593 \ 3594 /* recompilation */ \ 3595 product_pd(intx, CompileThreshold, \ 3596 "number of interpreted method invocations before (re-)compiling") \ 3597 \ 3598 product_pd(intx, BackEdgeThreshold, \ 3599 "Interpreter Back edge threshold at which an OSR compilation is " \ 3600 "invoked") \ 3601 \ 3602 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3603 "Interpreter (tier 0) invocation notification frequency") \ 3604 \ 3605 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3606 "C1 without MDO (tier 2) invocation notification frequency") \ 3607 \ 3608 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3609 "C1 with MDO profiling (tier 3) invocation notification " \ 3610 "frequency") \ 3611 \ 3612 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3613 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3614 \ 3615 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3616 "Interpreter (tier 0) invocation notification frequency") \ 3617 \ 3618 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3619 "C1 without MDO (tier 2) invocation notification frequency") \ 3620 \ 3621 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3622 "C1 with MDO profiling (tier 3) invocation notification " \ 3623 "frequency") \ 3624 \ 3625 product(intx, Tier2CompileThreshold, 0, \ 3626 "threshold at which tier 2 compilation is invoked") \ 3627 \ 3628 product(intx, Tier2BackEdgeThreshold, 0, \ 3629 "Back edge threshold at which tier 2 compilation is invoked") \ 3630 \ 3631 product(intx, Tier3InvocationThreshold, 200, \ 3632 "Compile if number of method invocations crosses this " \ 3633 "threshold") \ 3634 \ 3635 product(intx, Tier3MinInvocationThreshold, 100, \ 3636 "Minimum invocation to compile at tier 3") \ 3637 \ 3638 product(intx, Tier3CompileThreshold, 2000, \ 3639 "Threshold at which tier 3 compilation is invoked (invocation " \ 3640 "minimum must be satisfied") \ 3641 \ 3642 product(intx, Tier3BackEdgeThreshold, 60000, \ 3643 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3644 \ 3645 product(intx, Tier4InvocationThreshold, 5000, \ 3646 "Compile if number of method invocations crosses this " \ 3647 "threshold") \ 3648 \ 3649 product(intx, Tier4MinInvocationThreshold, 600, \ 3650 "Minimum invocation to compile at tier 4") \ 3651 \ 3652 product(intx, Tier4CompileThreshold, 15000, \ 3653 "Threshold at which tier 4 compilation is invoked (invocation " \ 3654 "minimum must be satisfied") \ 3655 \ 3656 product(intx, Tier4BackEdgeThreshold, 40000, \ 3657 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3658 \ 3659 product(intx, Tier3DelayOn, 5, \ 3660 "If C2 queue size grows over this amount per compiler thread " \ 3661 "stop compiling at tier 3 and start compiling at tier 2") \ 3662 \ 3663 product(intx, Tier3DelayOff, 2, \ 3664 "If C2 queue size is less than this amount per compiler thread " \ 3665 "allow methods compiled at tier 2 transition to tier 3") \ 3666 \ 3667 product(intx, Tier3LoadFeedback, 5, \ 3668 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3669 "reaches this amount per compiler thread") \ 3670 \ 3671 product(intx, Tier4LoadFeedback, 3, \ 3672 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3673 "reaches this amount per compiler thread") \ 3674 \ 3675 product(intx, TieredCompileTaskTimeout, 50, \ 3676 "Kill compile task if method was not used within " \ 3677 "given timeout in milliseconds") \ 3678 \ 3679 product(intx, TieredStopAtLevel, 4, \ 3680 "Stop at given compilation level") \ 3681 \ 3682 product(intx, Tier0ProfilingStartPercentage, 200, \ 3683 "Start profiling in interpreter if the counters exceed tier 3 " \ 3684 "thresholds by the specified percentage") \ 3685 \ 3686 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3687 "Increase the compile threshold for C1 compilation if the code " \ 3688 "cache is filled by the specified percentage") \ 3689 \ 3690 product(intx, TieredRateUpdateMinTime, 1, \ 3691 "Minimum rate sampling interval (in milliseconds)") \ 3692 \ 3693 product(intx, TieredRateUpdateMaxTime, 25, \ 3694 "Maximum rate sampling interval (in milliseconds)") \ 3695 \ 3696 product_pd(bool, TieredCompilation, \ 3697 "Enable tiered compilation") \ 3698 \ 3699 product(bool, PrintTieredEvents, false, \ 3700 "Print tiered events notifications") \ 3701 \ 3702 product_pd(intx, OnStackReplacePercentage, \ 3703 "NON_TIERED number of method invocations/branches (expressed as " \ 3704 "% of CompileThreshold) before (re-)compiling OSR code") \ 3705 \ 3706 product(intx, InterpreterProfilePercentage, 33, \ 3707 "NON_TIERED number of method invocations/branches (expressed as " \ 3708 "% of CompileThreshold) before profiling in the interpreter") \ 3709 \ 3710 develop(intx, MaxRecompilationSearchLength, 10, \ 3711 "The maximum number of frames to inspect when searching for " \ 3712 "recompilee") \ 3713 \ 3714 develop(intx, MaxInterpretedSearchLength, 3, \ 3715 "The maximum number of interpreted frames to skip when searching "\ 3716 "for recompilee") \ 3717 \ 3718 develop(intx, DesiredMethodLimit, 8000, \ 3719 "The desired maximum method size (in bytecodes) after inlining") \ 3720 \ 3721 develop(intx, HugeMethodLimit, 8000, \ 3722 "Don't compile methods larger than this if " \ 3723 "+DontCompileHugeMethods") \ 3724 \ 3725 /* New JDK 1.4 reflection implementation */ \ 3726 \ 3727 develop(bool, UseNewReflection, true, \ 3728 "Temporary flag for transition to reflection based on dynamic " \ 3729 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3730 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3731 "changes were needed") \ 3732 \ 3733 develop(bool, VerifyReflectionBytecodes, false, \ 3734 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3735 "in situations like that described in 4486457 or for " \ 3736 "constructors generated for serialization, so can not be enabled "\ 3737 "in product.") \ 3738 \ 3739 product(bool, ReflectionWrapResolutionErrors, true, \ 3740 "Temporary flag for transition to AbstractMethodError wrapped " \ 3741 "in InvocationTargetException. See 6531596") \ 3742 \ 3743 develop(intx, FastSuperclassLimit, 8, \ 3744 "Depth of hardwired instanceof accelerator array") \ 3745 \ 3746 /* Properties for Java libraries */ \ 3747 \ 3748 product(uintx, MaxDirectMemorySize, 0, \ 3749 "Maximum total size of NIO direct-buffer allocations") \ 3750 \ 3751 /* temporary developer defined flags */ \ 3752 \ 3753 diagnostic(bool, UseNewCode, false, \ 3754 "Testing Only: Use the new version while testing") \ 3755 \ 3756 diagnostic(bool, UseNewCode2, false, \ 3757 "Testing Only: Use the new version while testing") \ 3758 \ 3759 diagnostic(bool, UseNewCode3, false, \ 3760 "Testing Only: Use the new version while testing") \ 3761 \ 3762 /* flags for performance data collection */ \ 3763 \ 3764 product(bool, UsePerfData, falseInEmbedded, \ 3765 "Flag to disable jvmstat instrumentation for performance testing "\ 3766 "and problem isolation purposes") \ 3767 \ 3768 product(bool, PerfDataSaveToFile, false, \ 3769 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3770 \ 3771 product(ccstr, PerfDataSaveFile, NULL, \ 3772 "Save PerfData memory to the specified absolute pathname. " \ 3773 "The string %p in the file name (if present) " \ 3774 "will be replaced by pid") \ 3775 \ 3776 product(intx, PerfDataSamplingInterval, 50, \ 3777 "Data sampling interval (in milliseconds)") \ 3778 \ 3779 develop(bool, PerfTraceDataCreation, false, \ 3780 "Trace creation of Performance Data Entries") \ 3781 \ 3782 develop(bool, PerfTraceMemOps, false, \ 3783 "Trace PerfMemory create/attach/detach calls") \ 3784 \ 3785 product(bool, PerfDisableSharedMem, false, \ 3786 "Store performance data in standard memory") \ 3787 \ 3788 product(intx, PerfDataMemorySize, 32*K, \ 3789 "Size of performance data memory region. Will be rounded " \ 3790 "up to a multiple of the native os page size.") \ 3791 \ 3792 product(intx, PerfMaxStringConstLength, 1024, \ 3793 "Maximum PerfStringConstant string length before truncation") \ 3794 \ 3795 product(bool, PerfAllowAtExitRegistration, false, \ 3796 "Allow registration of atexit() methods") \ 3797 \ 3798 product(bool, PerfBypassFileSystemCheck, false, \ 3799 "Bypass Win32 file system criteria checks (Windows Only)") \ 3800 \ 3801 product(intx, UnguardOnExecutionViolation, 0, \ 3802 "Unguard page and retry on no-execute fault (Win32 only) " \ 3803 "0=off, 1=conservative, 2=aggressive") \ 3804 \ 3805 /* Serviceability Support */ \ 3806 \ 3807 product(bool, ManagementServer, false, \ 3808 "Create JMX Management Server") \ 3809 \ 3810 product(bool, DisableAttachMechanism, false, \ 3811 "Disable mechanism that allows tools to attach to this VM") \ 3812 \ 3813 product(bool, StartAttachListener, false, \ 3814 "Always start Attach Listener at VM startup") \ 3815 \ 3816 manageable(bool, PrintConcurrentLocks, false, \ 3817 "Print java.util.concurrent locks in thread dump") \ 3818 \ 3819 product(bool, TransmitErrorReport, false, \ 3820 "Enable error report transmission on erroneous termination") \ 3821 \ 3822 product(ccstr, ErrorReportServer, NULL, \ 3823 "Override built-in error report server address") \ 3824 \ 3825 /* Shared spaces */ \ 3826 \ 3827 product(bool, UseSharedSpaces, true, \ 3828 "Use shared spaces for metadata") \ 3829 \ 3830 product(bool, VerifySharedSpaces, false, \ 3831 "Verify shared spaces (false for default archive, true for " \ 3832 "archive specified by -XX:SharedArchiveFile)") \ 3833 \ 3834 product(bool, RequireSharedSpaces, false, \ 3835 "Require shared spaces for metadata") \ 3836 \ 3837 product(bool, DumpSharedSpaces, false, \ 3838 "Special mode: JVM reads a class list, loads classes, builds " \ 3839 "shared spaces, and dumps the shared spaces to a file to be " \ 3840 "used in future JVM runs") \ 3841 \ 3842 product(bool, PrintSharedSpaces, false, \ 3843 "Print usage of shared spaces") \ 3844 \ 3845 product(bool, PrintSharedArchiveAndExit, false, \ 3846 "Print shared archive file contents") \ 3847 \ 3848 product(bool, PrintSharedDictionary, false, \ 3849 "If PrintSharedArchiveAndExit is true, also print the shared " \ 3850 "dictionary") \ 3851 \ 3852 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3853 "Size of read-write space for metadata (in bytes)") \ 3854 \ 3855 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3856 "Size of read-only space for metadata (in bytes)") \ 3857 \ 3858 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3859 "Size of the shared miscellaneous data area (in bytes)") \ 3860 \ 3861 product(uintx, SharedMiscCodeSize, 120*K, \ 3862 "Size of the shared miscellaneous code area (in bytes)") \ 3863 \ 3864 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3865 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3866 "Address to allocate shared memory region for class data") \ 3867 \ 3868 diagnostic(bool, EnableInvokeDynamic, true, \ 3869 "support JSR 292 (method handles, invokedynamic, " \ 3870 "anonymous classes") \ 3871 \ 3872 diagnostic(bool, IgnoreUnverifiableClassesDuringDump, false, \ 3873 "Do not quit -Xshare:dump even if we encounter unverifiable " \ 3874 "classes. Just exclude them from the shared dictionary.") \ 3875 \ 3876 diagnostic(bool, PrintMethodHandleStubs, false, \ 3877 "Print generated stub code for method handles") \ 3878 \ 3879 develop(bool, TraceMethodHandles, false, \ 3880 "trace internal method handle operations") \ 3881 \ 3882 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3883 "perform extra checks when constructing method handles") \ 3884 \ 3885 diagnostic(bool, ShowHiddenFrames, false, \ 3886 "show method handle implementation frames (usually hidden)") \ 3887 \ 3888 experimental(bool, TrustFinalNonStaticFields, false, \ 3889 "trust final non-static declarations for constant folding") \ 3890 \ 3891 diagnostic(bool, FoldStableValues, true, \ 3892 "Optimize loads from stable fields (marked w/ @Stable)") \ 3893 \ 3894 develop(bool, TraceInvokeDynamic, false, \ 3895 "trace internal invoke dynamic operations") \ 3896 \ 3897 diagnostic(bool, PauseAtStartup, false, \ 3898 "Causes the VM to pause at startup time and wait for the pause " \ 3899 "file to be removed (default: ./vm.paused.<pid>)") \ 3900 \ 3901 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3902 "The file to create and for whose removal to await when pausing " \ 3903 "at startup. (default: ./vm.paused.<pid>)") \ 3904 \ 3905 diagnostic(bool, PauseAtExit, false, \ 3906 "Pause and wait for keypress on exit if a debugger is attached") \ 3907 \ 3908 product(bool, ExtendedDTraceProbes, false, \ 3909 "Enable performance-impacting dtrace probes") \ 3910 \ 3911 product(bool, DTraceMethodProbes, false, \ 3912 "Enable dtrace probes for method-entry and method-exit") \ 3913 \ 3914 product(bool, DTraceAllocProbes, false, \ 3915 "Enable dtrace probes for object allocation") \ 3916 \ 3917 product(bool, DTraceMonitorProbes, false, \ 3918 "Enable dtrace probes for monitor events") \ 3919 \ 3920 product(bool, RelaxAccessControlCheck, false, \ 3921 "Relax the access control checks in the verifier") \ 3922 \ 3923 diagnostic(bool, PrintDTraceDOF, false, \ 3924 "Print the DTrace DOF passed to the system for JSDT probes") \ 3925 \ 3926 product(uintx, StringTableSize, defaultStringTableSize, \ 3927 "Number of buckets in the interned String table") \ 3928 \ 3929 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3930 "Number of buckets in the JVM internal Symbol table") \ 3931 \ 3932 product(bool, UseStringDeduplication, false, \ 3933 "Use string deduplication") \ 3934 \ 3935 product(bool, PrintStringDeduplicationStatistics, false, \ 3936 "Print string deduplication statistics") \ 3937 \ 3938 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3939 "A string must reach this age (or be promoted to an old region) " \ 3940 "to be considered for deduplication") \ 3941 \ 3942 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3943 "Force table resize every time the table is scanned") \ 3944 \ 3945 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3946 "Force table rehash every time the table is scanned") \ 3947 \ 3948 develop(bool, TraceDefaultMethods, false, \ 3949 "Trace the default method processing steps") \ 3950 \ 3951 develop(bool, VerifyGenericSignatures, false, \ 3952 "Abort VM on erroneous or inconsistent generic signatures") \ 3953 \ 3954 product(bool, UseVMInterruptibleIO, false, \ 3955 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3956 "EINTR for I/O operations results in OS_INTRPT. The default " \ 3957 "value of this flag is true for JDK 6 and earlier") \ 3958 \ 3959 diagnostic(bool, WhiteBoxAPI, false, \ 3960 "Enable internal testing APIs") \ 3961 \ 3962 product(bool, PrintGCCause, true, \ 3963 "Include GC cause in GC logging") \ 3964 \ 3965 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3966 "Default survivor space alignment in bytes") \ 3967 \ 3968 product(bool , AllowNonVirtualCalls, false, \ 3969 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3970 \ 3971 product(ccstr, DumpLoadedClassList, NULL, \ 3972 "Dump the names all loaded classes, that could be stored into " \ 3973 "the CDS archive, in the specified file") \ 3974 \ 3975 product(ccstr, SharedClassListFile, NULL, \ 3976 "Override the default CDS class list") \ 3977 \ 3978 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3979 "Override the default location of the CDS archive file") \ 3980 \ 3981 product(ccstr, ExtraSharedClassListFile, NULL, \ 3982 "Extra classlist for building the CDS archive file") \ 3983 \ 3984 experimental(uintx, ArrayAllocatorMallocLimit, \ 3985 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3986 "Allocation less than this value will be allocated " \ 3987 "using malloc. Larger allocations will use mmap.") \ 3988 \ 3989 product_pd(bool, PreserveFramePointer, \ 3990 "Use the FP register for holding the frame pointer " \ 3991 "and not as a general purpose register.") \ 3992 \ 3993 JFR_ONLY(product(bool, FlightRecorder, false, \ 3994 "Enable Flight Recorder")) \ 3995 \ 3996 JFR_ONLY(product(ccstr, FlightRecorderOptions, NULL, \ 3997 "Flight Recorder options")) \ 3998 \ 3999 JFR_ONLY(product(ccstr, StartFlightRecording, NULL, \ 4000 "Start flight recording with options")) \ 4001 \ 4002 JFR_ONLY(product(bool, UnlockCommercialFeatures, false, \ 4003 "This flag is ignored. Left for compatibility")) \ 4004 \ 4005 experimental(bool, UseFastUnorderedTimeStamps, false, \ 4006 "Use platform unstable time where supported for timestamps only") \ 4007 \ 4008 JFR_ONLY(product(bool, LogJFR, false, \ 4009 "Enable JFR logging (consider +Verbose)")) \ 4010 4011 /* 4012 * Macros for factoring of globals 4013 */ 4014 4015 // Interface macros 4016 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4017 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 4018 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 4019 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 4020 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 4021 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 4022 #ifdef PRODUCT 4023 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 4024 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 4025 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 4026 #else 4027 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 4028 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 4029 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4030 #endif 4031 // Special LP64 flags, product only needed for now. 4032 #ifdef _LP64 4033 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 4034 #else 4035 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 4036 #endif // _LP64 4037 4038 // Implementation macros 4039 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 4040 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 4041 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 4042 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 4043 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 4044 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 4045 #ifdef PRODUCT 4046 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 4047 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 4048 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 4049 #else 4050 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 4051 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 4052 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 4053 #endif 4054 #ifdef _LP64 4055 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 4056 #else 4057 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 4058 #endif // _LP64 4059 4060 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) 4061 4062 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 4063 4064 ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 4065 4066 // Extensions 4067 4068 #include "runtime/globals_ext.hpp" 4069 4070 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP