1 /* 2 * Copyright (c) 1997, 2011, 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 #ifdef TARGET_ARCH_x86 30 # include "globals_x86.hpp" 31 #endif 32 #ifdef TARGET_ARCH_sparc 33 # include "globals_sparc.hpp" 34 #endif 35 #ifdef TARGET_ARCH_zero 36 # include "globals_zero.hpp" 37 #endif 38 #ifdef TARGET_ARCH_arm 39 # include "globals_arm.hpp" 40 #endif 41 #ifdef TARGET_ARCH_ppc 42 # include "globals_ppc.hpp" 43 #endif 44 #ifdef TARGET_OS_FAMILY_linux 45 # include "globals_linux.hpp" 46 #endif 47 #ifdef TARGET_OS_FAMILY_solaris 48 # include "globals_solaris.hpp" 49 #endif 50 #ifdef TARGET_OS_FAMILY_windows 51 # include "globals_windows.hpp" 52 #endif 53 #ifdef TARGET_OS_FAMILY_bsd 54 # include "globals_bsd.hpp" 55 #endif 56 #ifdef TARGET_OS_ARCH_linux_x86 57 # include "globals_linux_x86.hpp" 58 #endif 59 #ifdef TARGET_OS_ARCH_linux_sparc 60 # include "globals_linux_sparc.hpp" 61 #endif 62 #ifdef TARGET_OS_ARCH_linux_zero 63 # include "globals_linux_zero.hpp" 64 #endif 65 #ifdef TARGET_OS_ARCH_solaris_x86 66 # include "globals_solaris_x86.hpp" 67 #endif 68 #ifdef TARGET_OS_ARCH_solaris_sparc 69 # include "globals_solaris_sparc.hpp" 70 #endif 71 #ifdef TARGET_OS_ARCH_windows_x86 72 # include "globals_windows_x86.hpp" 73 #endif 74 #ifdef TARGET_OS_ARCH_linux_arm 75 # include "globals_linux_arm.hpp" 76 #endif 77 #ifdef TARGET_OS_ARCH_linux_ppc 78 # include "globals_linux_ppc.hpp" 79 #endif 80 #ifdef TARGET_OS_ARCH_bsd_x86 81 # include "globals_bsd_x86.hpp" 82 #endif 83 #ifdef TARGET_OS_ARCH_bsd_zero 84 # include "globals_bsd_zero.hpp" 85 #endif 86 #ifdef COMPILER1 87 #ifdef TARGET_ARCH_x86 88 # include "c1_globals_x86.hpp" 89 #endif 90 #ifdef TARGET_ARCH_sparc 91 # include "c1_globals_sparc.hpp" 92 #endif 93 #ifdef TARGET_ARCH_arm 94 # include "c1_globals_arm.hpp" 95 #endif 96 #ifdef TARGET_ARCH_ppc 97 # include "c1_globals_ppc.hpp" 98 #endif 99 #ifdef TARGET_OS_FAMILY_linux 100 # include "c1_globals_linux.hpp" 101 #endif 102 #ifdef TARGET_OS_FAMILY_solaris 103 # include "c1_globals_solaris.hpp" 104 #endif 105 #ifdef TARGET_OS_FAMILY_windows 106 # include "c1_globals_windows.hpp" 107 #endif 108 #ifdef TARGET_OS_FAMILY_bsd 109 # include "c1_globals_bsd.hpp" 110 #endif 111 #endif 112 #ifdef COMPILER2 113 #ifdef TARGET_ARCH_x86 114 # include "c2_globals_x86.hpp" 115 #endif 116 #ifdef TARGET_ARCH_sparc 117 # include "c2_globals_sparc.hpp" 118 #endif 119 #ifdef TARGET_ARCH_arm 120 # include "c2_globals_arm.hpp" 121 #endif 122 #ifdef TARGET_OS_FAMILY_linux 123 # include "c2_globals_linux.hpp" 124 #endif 125 #ifdef TARGET_OS_FAMILY_solaris 126 # include "c2_globals_solaris.hpp" 127 #endif 128 #ifdef TARGET_OS_FAMILY_windows 129 # include "c2_globals_windows.hpp" 130 #endif 131 #ifdef TARGET_OS_FAMILY_bsd 132 # include "c2_globals_bsd.hpp" 133 #endif 134 #endif 135 #ifdef SHARK 136 #ifdef TARGET_ARCH_zero 137 # include "shark_globals_zero.hpp" 138 #endif 139 #endif 140 141 #if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 142 define_pd_global(bool, BackgroundCompilation, false); 143 define_pd_global(bool, UseTLAB, false); 144 define_pd_global(bool, CICompileOSR, false); 145 define_pd_global(bool, UseTypeProfile, false); 146 define_pd_global(bool, UseOnStackReplacement, false); 147 define_pd_global(bool, InlineIntrinsics, false); 148 define_pd_global(bool, PreferInterpreterNativeStubs, true); 149 define_pd_global(bool, ProfileInterpreter, false); 150 define_pd_global(bool, ProfileTraps, false); 151 define_pd_global(bool, TieredCompilation, false); 152 153 define_pd_global(intx, CompileThreshold, 0); 154 define_pd_global(intx, BackEdgeThreshold, 0); 155 156 define_pd_global(intx, OnStackReplacePercentage, 0); 157 define_pd_global(bool, ResizeTLAB, false); 158 define_pd_global(intx, FreqInlineSize, 0); 159 define_pd_global(intx, InlineSmallCode, 0); 160 define_pd_global(intx, NewSizeThreadIncrease, 4*K); 161 define_pd_global(intx, InlineClassNatives, true); 162 define_pd_global(intx, InlineUnsafeOps, true); 163 define_pd_global(intx, InitialCodeCacheSize, 160*K); 164 define_pd_global(intx, ReservedCodeCacheSize, 32*M); 165 define_pd_global(intx, CodeCacheExpansionSize, 32*K); 166 define_pd_global(intx, CodeCacheMinBlockLength, 1); 167 define_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 168 define_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 169 define_pd_global(bool, NeverActAsServerClassMachine, true); 170 define_pd_global(uint64_t,MaxRAM, 1ULL*G); 171 #define CI_COMPILER_COUNT 0 172 #else 173 174 #ifdef COMPILER2 175 #define CI_COMPILER_COUNT 2 176 #else 177 #define CI_COMPILER_COUNT 1 178 #endif // COMPILER2 179 180 #endif // no compilers 181 182 183 // string type aliases used only in this file 184 typedef const char* ccstr; 185 typedef const char* ccstrlist; // represents string arguments which accumulate 186 187 enum FlagValueOrigin { 188 DEFAULT = 0, 189 COMMAND_LINE = 1, 190 ENVIRON_VAR = 2, 191 CONFIG_FILE = 3, 192 MANAGEMENT = 4, 193 ERGONOMIC = 5, 194 ATTACH_ON_DEMAND = 6, 195 INTERNAL = 99 196 }; 197 198 struct Flag { 199 const char *type; 200 const char *name; 201 void* addr; 202 203 NOT_PRODUCT(const char *doc;) 204 205 const char *kind; 206 FlagValueOrigin origin; 207 208 // points to all Flags static array 209 static Flag *flags; 210 211 // number of flags 212 static size_t numFlags; 213 214 static Flag* find_flag(char* name, size_t length); 215 216 bool is_bool() const { return strcmp(type, "bool") == 0; } 217 bool get_bool() const { return *((bool*) addr); } 218 void set_bool(bool value) { *((bool*) addr) = value; } 219 220 bool is_intx() const { return strcmp(type, "intx") == 0; } 221 intx get_intx() const { return *((intx*) addr); } 222 void set_intx(intx value) { *((intx*) addr) = value; } 223 224 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 225 uintx get_uintx() const { return *((uintx*) addr); } 226 void set_uintx(uintx value) { *((uintx*) addr) = value; } 227 228 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 229 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 230 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 231 232 bool is_double() const { return strcmp(type, "double") == 0; } 233 double get_double() const { return *((double*) addr); } 234 void set_double(double value) { *((double*) addr) = value; } 235 236 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 237 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 238 ccstr get_ccstr() const { return *((ccstr*) addr); } 239 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 240 241 bool is_unlocker() const; 242 bool is_unlocked() const; 243 bool is_writeable() const; 244 bool is_external() const; 245 246 void print_on(outputStream* st, bool withComments = false ); 247 void print_as_flag(outputStream* st); 248 }; 249 250 // debug flags control various aspects of the VM and are global accessible 251 252 // use FlagSetting to temporarily change some debug flag 253 // e.g. FlagSetting fs(DebugThisAndThat, true); 254 // restored to previous value upon leaving scope 255 class FlagSetting { 256 bool val; 257 bool* flag; 258 public: 259 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 260 ~FlagSetting() { *flag = val; } 261 }; 262 263 264 class CounterSetting { 265 intx* counter; 266 public: 267 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 268 ~CounterSetting() { (*counter)--; } 269 }; 270 271 272 class IntFlagSetting { 273 intx val; 274 intx* flag; 275 public: 276 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 277 ~IntFlagSetting() { *flag = val; } 278 }; 279 280 281 class DoubleFlagSetting { 282 double val; 283 double* flag; 284 public: 285 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 286 ~DoubleFlagSetting() { *flag = val; } 287 }; 288 289 290 class CommandLineFlags { 291 public: 292 static bool boolAt(char* name, size_t len, bool* value); 293 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 294 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 295 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 296 297 static bool intxAt(char* name, size_t len, intx* value); 298 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 299 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 300 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 301 302 static bool uintxAt(char* name, size_t len, uintx* value); 303 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 304 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 305 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 306 307 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 308 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 309 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 310 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 311 312 static bool doubleAt(char* name, size_t len, double* value); 313 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 314 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 315 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 316 317 static bool ccstrAt(char* name, size_t len, ccstr* value); 318 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 319 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 320 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 321 322 // Returns false if name is not a command line flag. 323 static bool wasSetOnCmdline(const char* name, bool* value); 324 static void printSetFlags(); 325 326 static void printFlags(bool withComments = false ); 327 328 static void verify() PRODUCT_RETURN; 329 }; 330 331 // use this for flags that are true by default in the debug version but 332 // false in the optimized version, and vice versa 333 #ifdef ASSERT 334 #define trueInDebug true 335 #define falseInDebug false 336 #else 337 #define trueInDebug false 338 #define falseInDebug true 339 #endif 340 341 // use this for flags that are true per default in the product build 342 // but false in development builds, and vice versa 343 #ifdef PRODUCT 344 #define trueInProduct true 345 #define falseInProduct false 346 #else 347 #define trueInProduct false 348 #define falseInProduct true 349 #endif 350 351 // use this for flags that are true per default in the tiered build 352 // but false in non-tiered builds, and vice versa 353 #ifdef TIERED 354 #define trueInTiered true 355 #define falseInTiered false 356 #else 357 #define trueInTiered false 358 #define falseInTiered true 359 #endif 360 361 #ifdef JAVASE_EMBEDDED 362 #define falseInEmbedded false 363 #else 364 #define falseInEmbedded true 365 #endif 366 367 // develop flags are settable / visible only during development and are constant in the PRODUCT version 368 // product flags are always settable / visible 369 // notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 370 371 // A flag must be declared with one of the following types: 372 // bool, intx, uintx, ccstr. 373 // The type "ccstr" is an alias for "const char*" and is used 374 // only in this file, because the macrology requires single-token type names. 375 376 // Note: Diagnostic options not meant for VM tuning or for product modes. 377 // They are to be used for VM quality assurance or field diagnosis 378 // of VM bugs. They are hidden so that users will not be encouraged to 379 // try them as if they were VM ordinary execution options. However, they 380 // are available in the product version of the VM. Under instruction 381 // from support engineers, VM customers can turn them on to collect 382 // diagnostic information about VM problems. To use a VM diagnostic 383 // option, you must first specify +UnlockDiagnosticVMOptions. 384 // (This master switch also affects the behavior of -Xprintflags.) 385 // 386 // experimental flags are in support of features that are not 387 // part of the officially supported product, but are available 388 // for experimenting with. They could, for example, be performance 389 // features that may not have undergone full or rigorous QA, but which may 390 // help performance in some cases and released for experimentation 391 // by the community of users and developers. This flag also allows one to 392 // be able to build a fully supported product that nonetheless also 393 // ships with some unsupported, lightly tested, experimental features. 394 // Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 395 // UnlockExperimentalVMOptions flag, which allows the control and 396 // modification of the experimental flags. 397 // 398 // Nota bene: neither diagnostic nor experimental options should be used casually, 399 // and they are not supported on production loads, except under explicit 400 // direction from support engineers. 401 // 402 // manageable flags are writeable external product flags. 403 // They are dynamically writeable through the JDK management interface 404 // (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 405 // These flags are external exported interface (see CCC). The list of 406 // manageable flags can be queried programmatically through the management 407 // interface. 408 // 409 // A flag can be made as "manageable" only if 410 // - the flag is defined in a CCC as an external exported interface. 411 // - the VM implementation supports dynamic setting of the flag. 412 // This implies that the VM must *always* query the flag variable 413 // and not reuse state related to the flag state at any given time. 414 // - you want the flag to be queried programmatically by the customers. 415 // 416 // product_rw flags are writeable internal product flags. 417 // They are like "manageable" flags but for internal/private use. 418 // The list of product_rw flags are internal/private flags which 419 // may be changed/removed in a future release. It can be set 420 // through the management interface to get/set value 421 // when the name of flag is supplied. 422 // 423 // A flag can be made as "product_rw" only if 424 // - the VM implementation supports dynamic setting of the flag. 425 // This implies that the VM must *always* query the flag variable 426 // and not reuse state related to the flag state at any given time. 427 // 428 // Note that when there is a need to support develop flags to be writeable, 429 // it can be done in the same way as product_rw. 430 431 #define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 432 \ 433 lp64_product(bool, UseCompressedOops, false, \ 434 "Use 32-bit object references in 64-bit VM. " \ 435 "lp64_product means flag is always constant in 32 bit VM") \ 436 \ 437 notproduct(bool, CheckCompressedOops, true, \ 438 "generate checks in encoding/decoding code in debug VM") \ 439 \ 440 product_pd(uintx, HeapBaseMinAddress, \ 441 "OS specific low limit for heap base address") \ 442 \ 443 diagnostic(bool, PrintCompressedOopsMode, false, \ 444 "Print compressed oops base address and encoding mode") \ 445 \ 446 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 447 "Default object alignment in bytes, 8 is minimum") \ 448 \ 449 /* UseMembar is theoretically a temp flag used for memory barrier \ 450 * removal testing. It was supposed to be removed before FCS but has \ 451 * been re-added (see 6401008) */ \ 452 product_pd(bool, UseMembar, \ 453 "(Unstable) Issues membars on thread state transitions") \ 454 \ 455 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 456 * that don't support it. This will be replaced by processor detection \ 457 * logic. \ 458 */ \ 459 product(bool, UsePPCLWSYNC, true, \ 460 "Use lwsync instruction if true, else use slower sync") \ 461 \ 462 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 463 "Whether to clean the chunk pool asynchronously") \ 464 \ 465 /* Temporary: See 6948537 */ \ 466 experimental(bool, UseMemSetInBOT, true, \ 467 "(Unstable) uses memset in BOT updates in GC code") \ 468 \ 469 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 470 "Enable normal processing of flags relating to field diagnostics")\ 471 \ 472 experimental(bool, UnlockExperimentalVMOptions, false, \ 473 "Enable normal processing of flags relating to experimental features")\ 474 \ 475 product(bool, JavaMonitorsInStackTrace, true, \ 476 "Print info. about Java monitor locks when the stacks are dumped")\ 477 \ 478 product_pd(bool, UseLargePages, \ 479 "Use large page memory") \ 480 \ 481 product_pd(bool, UseLargePagesIndividualAllocation, \ 482 "Allocate large pages individually for better affinity") \ 483 \ 484 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 485 "Fail large pages individual allocation") \ 486 \ 487 develop(bool, TracePageSizes, false, \ 488 "Trace page size selection and usage.") \ 489 \ 490 product(bool, UseNUMA, false, \ 491 "Use NUMA if available") \ 492 \ 493 product(bool, UseNUMAInterleaving, false, \ 494 "Interleave memory across NUMA nodes if available") \ 495 \ 496 product(uintx, NUMAInterleaveGranularity, 2*M, \ 497 "Granularity to use for NUMA interleaving on Windows OS") \ 498 \ 499 product(bool, ForceNUMA, false, \ 500 "Force NUMA optimizations on single-node/UMA systems") \ 501 \ 502 product(intx, NUMAChunkResizeWeight, 20, \ 503 "Percentage (0-100) used to weight the current sample when " \ 504 "computing exponentially decaying average for " \ 505 "AdaptiveNUMAChunkSizing") \ 506 \ 507 product(intx, NUMASpaceResizeRate, 1*G, \ 508 "Do not reallocate more that this amount per collection") \ 509 \ 510 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 511 "Enable adaptive chunk sizing for NUMA") \ 512 \ 513 product(bool, NUMAStats, false, \ 514 "Print NUMA stats in detailed heap information") \ 515 \ 516 product(intx, NUMAPageScanRate, 256, \ 517 "Maximum number of pages to include in the page scan procedure") \ 518 \ 519 product_pd(bool, NeedsDeoptSuspend, \ 520 "True for register window machines (sparc/ia64)") \ 521 \ 522 product(intx, UseSSE, 99, \ 523 "Highest supported SSE instructions set on x86/x64") \ 524 \ 525 product(intx, UseVIS, 99, \ 526 "Highest supported VIS instructions set on Sparc") \ 527 \ 528 product(uintx, LargePageSizeInBytes, 0, \ 529 "Large page size (0 to let VM choose the page size") \ 530 \ 531 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 532 "Use large pages if max heap is at least this big") \ 533 \ 534 product(bool, ForceTimeHighResolution, false, \ 535 "Using high time resolution(For Win32 only)") \ 536 \ 537 develop(bool, TraceItables, false, \ 538 "Trace initialization and use of itables") \ 539 \ 540 develop(bool, TracePcPatching, false, \ 541 "Trace usage of frame::patch_pc") \ 542 \ 543 develop(bool, TraceJumps, false, \ 544 "Trace assembly jumps in thread ring buffer") \ 545 \ 546 develop(bool, TraceRelocator, false, \ 547 "Trace the bytecode relocator") \ 548 \ 549 develop(bool, TraceLongCompiles, false, \ 550 "Print out every time compilation is longer than " \ 551 "a given threashold") \ 552 \ 553 develop(bool, SafepointALot, false, \ 554 "Generates a lot of safepoints. Works with " \ 555 "GuaranteedSafepointInterval") \ 556 \ 557 product_pd(bool, BackgroundCompilation, \ 558 "A thread requesting compilation is not blocked during " \ 559 "compilation") \ 560 \ 561 product(bool, PrintVMQWaitTime, false, \ 562 "Prints out the waiting time in VM operation queue") \ 563 \ 564 develop(bool, BailoutToInterpreterForThrows, false, \ 565 "Compiled methods which throws/catches exceptions will be " \ 566 "deopt and intp.") \ 567 \ 568 develop(bool, NoYieldsInMicrolock, false, \ 569 "Disable yields in microlock") \ 570 \ 571 develop(bool, TraceOopMapGeneration, false, \ 572 "Shows oopmap generation") \ 573 \ 574 product(bool, MethodFlushing, true, \ 575 "Reclamation of zombie and not-entrant methods") \ 576 \ 577 develop(bool, VerifyStack, false, \ 578 "Verify stack of each thread when it is entering a runtime call") \ 579 \ 580 develop(bool, ForceUnreachable, false, \ 581 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 582 \ 583 notproduct(bool, StressDerivedPointers, false, \ 584 "Force scavenge when a derived pointers is detected on stack " \ 585 "after rtm call") \ 586 \ 587 develop(bool, TraceDerivedPointers, false, \ 588 "Trace traversal of derived pointers on stack") \ 589 \ 590 notproduct(bool, TraceCodeBlobStacks, false, \ 591 "Trace stack-walk of codeblobs") \ 592 \ 593 product(bool, PrintJNIResolving, false, \ 594 "Used to implement -v:jni") \ 595 \ 596 notproduct(bool, PrintRewrites, false, \ 597 "Print methods that are being rewritten") \ 598 \ 599 product(bool, UseInlineCaches, true, \ 600 "Use Inline Caches for virtual calls ") \ 601 \ 602 develop(bool, InlineArrayCopy, true, \ 603 "inline arraycopy native that is known to be part of " \ 604 "base library DLL") \ 605 \ 606 develop(bool, InlineObjectHash, true, \ 607 "inline Object::hashCode() native that is known to be part " \ 608 "of base library DLL") \ 609 \ 610 develop(bool, InlineObjectCopy, true, \ 611 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 612 \ 613 develop(bool, InlineNatives, true, \ 614 "inline natives that are known to be part of base library DLL") \ 615 \ 616 develop(bool, InlineMathNatives, true, \ 617 "inline SinD, CosD, etc.") \ 618 \ 619 develop(bool, InlineClassNatives, true, \ 620 "inline Class.isInstance, etc") \ 621 \ 622 develop(bool, InlineAtomicLong, true, \ 623 "inline sun.misc.AtomicLong") \ 624 \ 625 develop(bool, InlineThreadNatives, true, \ 626 "inline Thread.currentThread, etc") \ 627 \ 628 develop(bool, InlineReflectionGetCallerClass, true, \ 629 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 630 "of base library DLL") \ 631 \ 632 develop(bool, InlineUnsafeOps, true, \ 633 "inline memory ops (native methods) from sun.misc.Unsafe") \ 634 \ 635 develop(bool, ConvertCmpD2CmpF, true, \ 636 "Convert cmpD to cmpF when one input is constant in float range") \ 637 \ 638 develop(bool, ConvertFloat2IntClipping, true, \ 639 "Convert float2int clipping idiom to integer clipping") \ 640 \ 641 develop(bool, SpecialStringCompareTo, true, \ 642 "special version of string compareTo") \ 643 \ 644 develop(bool, SpecialStringIndexOf, true, \ 645 "special version of string indexOf") \ 646 \ 647 develop(bool, SpecialStringEquals, true, \ 648 "special version of string equals") \ 649 \ 650 develop(bool, SpecialArraysEquals, true, \ 651 "special version of Arrays.equals(char[],char[])") \ 652 \ 653 product(bool, UseSSE42Intrinsics, false, \ 654 "SSE4.2 versions of intrinsics") \ 655 \ 656 product(bool, UseCondCardMark, false, \ 657 "Check for already marked card before updating card table") \ 658 \ 659 develop(bool, TraceCallFixup, false, \ 660 "traces all call fixups") \ 661 \ 662 develop(bool, DeoptimizeALot, false, \ 663 "deoptimize at every exit from the runtime system") \ 664 \ 665 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 666 "a comma separated list of bcis to deoptimize at") \ 667 \ 668 product(bool, DeoptimizeRandom, false, \ 669 "deoptimize random frames on random exit from the runtime system")\ 670 \ 671 notproduct(bool, ZombieALot, false, \ 672 "creates zombies (non-entrant) at exit from the runt. system") \ 673 \ 674 product(bool, UnlinkSymbolsALot, false, \ 675 "unlink unreferenced symbols from the symbol table at safepoints")\ 676 \ 677 notproduct(bool, WalkStackALot, false, \ 678 "trace stack (no print) at every exit from the runtime system") \ 679 \ 680 develop(bool, Debugging, false, \ 681 "set when executing debug methods in debug.ccp " \ 682 "(to prevent triggering assertions)") \ 683 \ 684 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 685 "Enable strict checks that safepoints cannot happen for threads " \ 686 "that used No_Safepoint_Verifier") \ 687 \ 688 notproduct(bool, VerifyLastFrame, false, \ 689 "Verify oops on last frame on entry to VM") \ 690 \ 691 develop(bool, TraceHandleAllocation, false, \ 692 "Prints out warnings when suspicious many handles are allocated") \ 693 \ 694 product(bool, UseCompilerSafepoints, true, \ 695 "Stop at safepoints in compiled code") \ 696 \ 697 product(bool, UseSplitVerifier, true, \ 698 "use split verifier with StackMapTable attributes") \ 699 \ 700 product(bool, FailOverToOldVerifier, true, \ 701 "fail over to old verifier when split verifier fails") \ 702 \ 703 develop(bool, ShowSafepointMsgs, false, \ 704 "Show msg. about safepoint synch.") \ 705 \ 706 product(bool, SafepointTimeout, false, \ 707 "Time out and warn or fail after SafepointTimeoutDelay " \ 708 "milliseconds if failed to reach safepoint") \ 709 \ 710 develop(bool, DieOnSafepointTimeout, false, \ 711 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 712 \ 713 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 714 /* typically, at most a few retries are needed */ \ 715 product(intx, SuspendRetryCount, 50, \ 716 "Maximum retry count for an external suspend request") \ 717 \ 718 product(intx, SuspendRetryDelay, 5, \ 719 "Milliseconds to delay per retry (* current_retry_count)") \ 720 \ 721 product(bool, AssertOnSuspendWaitFailure, false, \ 722 "Assert/Guarantee on external suspend wait failure") \ 723 \ 724 product(bool, TraceSuspendWaitFailures, false, \ 725 "Trace external suspend wait failures") \ 726 \ 727 product(bool, MaxFDLimit, true, \ 728 "Bump the number of file descriptors to max in solaris.") \ 729 \ 730 notproduct(bool, LogEvents, trueInDebug, \ 731 "Enable Event log") \ 732 \ 733 product(bool, BytecodeVerificationRemote, true, \ 734 "Enables the Java bytecode verifier for remote classes") \ 735 \ 736 product(bool, BytecodeVerificationLocal, false, \ 737 "Enables the Java bytecode verifier for local classes") \ 738 \ 739 develop(bool, ForceFloatExceptions, trueInDebug, \ 740 "Force exceptions on FP stack under/overflow") \ 741 \ 742 develop(bool, SoftMatchFailure, trueInProduct, \ 743 "If the DFA fails to match a node, print a message and bail out") \ 744 \ 745 develop(bool, VerifyStackAtCalls, false, \ 746 "Verify that the stack pointer is unchanged after calls") \ 747 \ 748 develop(bool, TraceJavaAssertions, false, \ 749 "Trace java language assertions") \ 750 \ 751 notproduct(bool, CheckAssertionStatusDirectives, false, \ 752 "temporary - see javaClasses.cpp") \ 753 \ 754 notproduct(bool, PrintMallocFree, false, \ 755 "Trace calls to C heap malloc/free allocation") \ 756 \ 757 product(bool, PrintOopAddress, false, \ 758 "Always print the location of the oop") \ 759 \ 760 notproduct(bool, VerifyCodeCacheOften, false, \ 761 "Verify compiled-code cache often") \ 762 \ 763 develop(bool, ZapDeadCompiledLocals, false, \ 764 "Zap dead locals in compiler frames") \ 765 \ 766 notproduct(bool, ZapDeadLocalsOld, false, \ 767 "Zap dead locals (old version, zaps all frames when " \ 768 "entering the VM") \ 769 \ 770 notproduct(bool, CheckOopishValues, false, \ 771 "Warn if value contains oop ( requires ZapDeadLocals)") \ 772 \ 773 develop(bool, UseMallocOnly, false, \ 774 "use only malloc/free for allocation (no resource area/arena)") \ 775 \ 776 develop(bool, PrintMalloc, false, \ 777 "print all malloc/free calls") \ 778 \ 779 develop(bool, PrintMallocStatistics, false, \ 780 "print malloc/free statistics") \ 781 \ 782 develop(bool, ZapResourceArea, trueInDebug, \ 783 "Zap freed resource/arena space with 0xABABABAB") \ 784 \ 785 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 786 "Zap freed VM handle space with 0xBCBCBCBC") \ 787 \ 788 develop(bool, ZapJNIHandleArea, trueInDebug, \ 789 "Zap freed JNI handle space with 0xFEFEFEFE") \ 790 \ 791 notproduct(bool, ZapStackSegments, trueInDebug, \ 792 "Zap allocated/freed Stack segments with 0xFADFADED") \ 793 \ 794 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 795 "Zap unused heap space with 0xBAADBABE") \ 796 \ 797 develop(bool, TraceZapUnusedHeapArea, false, \ 798 "Trace zapping of unused heap space") \ 799 \ 800 develop(bool, CheckZapUnusedHeapArea, false, \ 801 "Check zapping of unused heap space") \ 802 \ 803 develop(bool, ZapFillerObjects, trueInDebug, \ 804 "Zap filler objects with 0xDEAFBABE") \ 805 \ 806 develop(bool, PrintVMMessages, true, \ 807 "Print vm messages on console") \ 808 \ 809 product(bool, PrintGCApplicationConcurrentTime, false, \ 810 "Print the time the application has been running") \ 811 \ 812 product(bool, PrintGCApplicationStoppedTime, false, \ 813 "Print the time the application has been stopped") \ 814 \ 815 notproduct(uintx, ErrorHandlerTest, 0, \ 816 "If > 0, provokes an error after VM initialization; the value" \ 817 "determines which error to provoke. See test_error_handler()" \ 818 "in debug.cpp.") \ 819 \ 820 develop(bool, Verbose, false, \ 821 "Prints additional debugging information from other modes") \ 822 \ 823 develop(bool, PrintMiscellaneous, false, \ 824 "Prints uncategorized debugging information (requires +Verbose)") \ 825 \ 826 develop(bool, WizardMode, false, \ 827 "Prints much more debugging information") \ 828 \ 829 product(bool, ShowMessageBoxOnError, false, \ 830 "Keep process alive on VM fatal error") \ 831 \ 832 product(bool, CreateMinidumpOnCrash, false, \ 833 "Create minidump on VM fatal error") \ 834 \ 835 product_pd(bool, UseOSErrorReporting, \ 836 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 837 \ 838 product(bool, SuppressFatalErrorMessage, false, \ 839 "Do NO Fatal Error report [Avoid deadlock]") \ 840 \ 841 product(ccstrlist, OnError, "", \ 842 "Run user-defined commands on fatal error; see VMError.cpp " \ 843 "for examples") \ 844 \ 845 product(ccstrlist, OnOutOfMemoryError, "", \ 846 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 847 \ 848 manageable(bool, HeapDumpBeforeFullGC, false, \ 849 "Dump heap to file before any major stop-world GC") \ 850 \ 851 manageable(bool, HeapDumpAfterFullGC, false, \ 852 "Dump heap to file after any major stop-world GC") \ 853 \ 854 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 855 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 856 \ 857 manageable(ccstr, HeapDumpPath, NULL, \ 858 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 859 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 860 "in the working directory)") \ 861 \ 862 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 863 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 864 "when the heap usage is larger than this") \ 865 \ 866 develop(uintx, HeapDumpSegmentSize, 1*G, \ 867 "Approximate segment size when generating a segmented heap dump") \ 868 \ 869 develop(bool, BreakAtWarning, false, \ 870 "Execute breakpoint upon encountering VM warning") \ 871 \ 872 product_pd(bool, UseVectoredExceptions, \ 873 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 874 \ 875 develop(bool, TraceVMOperation, false, \ 876 "Trace vm operations") \ 877 \ 878 develop(bool, UseFakeTimers, false, \ 879 "Tells whether the VM should use system time or a fake timer") \ 880 \ 881 diagnostic(bool, LogCompilation, false, \ 882 "Log compilation activity in detail to hotspot.log or LogFile") \ 883 \ 884 product(bool, PrintCompilation, false, \ 885 "Print compilations") \ 886 \ 887 diagnostic(bool, TraceNMethodInstalls, false, \ 888 "Trace nmethod intallation") \ 889 \ 890 diagnostic(intx, ScavengeRootsInCode, 1, \ 891 "0: do not allow scavengable oops in the code cache; " \ 892 "1: allow scavenging from the code cache; " \ 893 "2: emit as many constants as the compiler can see") \ 894 \ 895 diagnostic(bool, TraceOSRBreakpoint, false, \ 896 "Trace OSR Breakpoint ") \ 897 \ 898 diagnostic(bool, TraceCompileTriggered, false, \ 899 "Trace compile triggered") \ 900 \ 901 diagnostic(bool, TraceTriggers, false, \ 902 "Trace triggers") \ 903 \ 904 product(bool, AlwaysRestoreFPU, false, \ 905 "Restore the FPU control word after every JNI call (expensive)") \ 906 \ 907 notproduct(bool, PrintCompilation2, false, \ 908 "Print additional statistics per compilation") \ 909 \ 910 diagnostic(bool, PrintAdapterHandlers, false, \ 911 "Print code generated for i2c/c2i adapters") \ 912 \ 913 develop(bool, VerifyAdapterSharing, false, \ 914 "Verify that the code for shared adapters is the equivalent") \ 915 \ 916 diagnostic(bool, PrintAssembly, false, \ 917 "Print assembly code (using external disassembler.so)") \ 918 \ 919 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 920 "Options string passed to disassembler.so") \ 921 \ 922 diagnostic(bool, PrintNMethods, false, \ 923 "Print assembly code for nmethods when generated") \ 924 \ 925 diagnostic(bool, PrintNativeNMethods, false, \ 926 "Print assembly code for native nmethods when generated") \ 927 \ 928 develop(bool, PrintDebugInfo, false, \ 929 "Print debug information for all nmethods when generated") \ 930 \ 931 develop(bool, PrintRelocations, false, \ 932 "Print relocation information for all nmethods when generated") \ 933 \ 934 develop(bool, PrintDependencies, false, \ 935 "Print dependency information for all nmethods when generated") \ 936 \ 937 develop(bool, PrintExceptionHandlers, false, \ 938 "Print exception handler tables for all nmethods when generated") \ 939 \ 940 develop(bool, InterceptOSException, false, \ 941 "Starts debugger when an implicit OS (e.g., NULL) " \ 942 "exception happens") \ 943 \ 944 notproduct(bool, PrintCodeCache, false, \ 945 "Print the compiled_code cache when exiting") \ 946 \ 947 develop(bool, PrintCodeCache2, false, \ 948 "Print detailed info on the compiled_code cache when exiting") \ 949 \ 950 diagnostic(bool, PrintStubCode, false, \ 951 "Print generated stub code") \ 952 \ 953 product(bool, StackTraceInThrowable, true, \ 954 "Collect backtrace in throwable when exception happens") \ 955 \ 956 product(bool, OmitStackTraceInFastThrow, true, \ 957 "Omit backtraces for some 'hot' exceptions in optimized code") \ 958 \ 959 product(bool, ProfilerPrintByteCodeStatistics, false, \ 960 "Prints byte code statictics when dumping profiler output") \ 961 \ 962 product(bool, ProfilerRecordPC, false, \ 963 "Collects tick for each 16 byte interval of compiled code") \ 964 \ 965 product(bool, ProfileVM, false, \ 966 "Profiles ticks that fall within VM (either in the VM Thread " \ 967 "or VM code called through stubs)") \ 968 \ 969 product(bool, ProfileIntervals, false, \ 970 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 971 \ 972 notproduct(bool, ProfilerCheckIntervals, false, \ 973 "Collect and print info on spacing of profiler ticks") \ 974 \ 975 develop(bool, PrintJVMWarnings, false, \ 976 "Prints warnings for unimplemented JVM functions") \ 977 \ 978 product(bool, PrintWarnings, true, \ 979 "Prints JVM warnings to output stream") \ 980 \ 981 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 982 "Prints warnings for stalled SpinLocks") \ 983 \ 984 develop(bool, InitializeJavaLangSystem, true, \ 985 "Initialize java.lang.System - turn off for individual " \ 986 "method debugging") \ 987 \ 988 develop(bool, InitializeJavaLangString, true, \ 989 "Initialize java.lang.String - turn off for individual " \ 990 "method debugging") \ 991 \ 992 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 993 "Initialize various error and exception classes - turn off for " \ 994 "individual method debugging") \ 995 \ 996 product(bool, RegisterFinalizersAtInit, true, \ 997 "Register finalizable objects at end of Object.<init> or " \ 998 "after allocation") \ 999 \ 1000 develop(bool, RegisterReferences, true, \ 1001 "Tells whether the VM should register soft/weak/final/phantom " \ 1002 "references") \ 1003 \ 1004 develop(bool, IgnoreRewrites, false, \ 1005 "Supress rewrites of bytecodes in the oopmap generator. " \ 1006 "This is unsafe!") \ 1007 \ 1008 develop(bool, PrintCodeCacheExtension, false, \ 1009 "Print extension of code cache") \ 1010 \ 1011 develop(bool, UsePrivilegedStack, true, \ 1012 "Enable the security JVM functions") \ 1013 \ 1014 develop(bool, IEEEPrecision, true, \ 1015 "Enables IEEE precision (for INTEL only)") \ 1016 \ 1017 develop(bool, ProtectionDomainVerification, true, \ 1018 "Verifies protection domain before resolution in system " \ 1019 "dictionary") \ 1020 \ 1021 product(bool, ClassUnloading, true, \ 1022 "Do unloading of classes") \ 1023 \ 1024 diagnostic(bool, LinkWellKnownClasses, false, \ 1025 "Resolve a well known class as soon as its name is seen") \ 1026 \ 1027 develop(bool, DisableStartThread, false, \ 1028 "Disable starting of additional Java threads " \ 1029 "(for debugging only)") \ 1030 \ 1031 develop(bool, MemProfiling, false, \ 1032 "Write memory usage profiling to log file") \ 1033 \ 1034 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1035 "Prints the system dictionary at exit") \ 1036 \ 1037 diagnostic(bool, UnsyncloadClass, false, \ 1038 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1039 "class loader must call VM synchronized for findClass " \ 1040 "and defineClass.") \ 1041 \ 1042 product(bool, AlwaysLockClassLoader, false, \ 1043 "Require the VM to acquire the class loader lock before calling " \ 1044 "loadClass() even for class loaders registering " \ 1045 "as parallel capable") \ 1046 \ 1047 product(bool, AllowParallelDefineClass, false, \ 1048 "Allow parallel defineClass requests for class loaders " \ 1049 "registering as parallel capable") \ 1050 \ 1051 product(bool, MustCallLoadClassInternal, false, \ 1052 "Call loadClassInternal() rather than loadClass()") \ 1053 \ 1054 product_pd(bool, DontYieldALot, \ 1055 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1056 \ 1057 product_pd(bool, ConvertSleepToYield, \ 1058 "Converts sleep(0) to thread yield " \ 1059 "(may be off for SOLARIS to improve GUI)") \ 1060 \ 1061 product(bool, ConvertYieldToSleep, false, \ 1062 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1063 "behavior (SOLARIS only)") \ 1064 \ 1065 product(bool, UseBoundThreads, true, \ 1066 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1067 \ 1068 develop(bool, UseDetachedThreads, true, \ 1069 "Use detached threads that are recycled upon termination " \ 1070 "(for SOLARIS only)") \ 1071 \ 1072 product(bool, UseLWPSynchronization, true, \ 1073 "Use LWP-based instead of libthread-based synchronization " \ 1074 "(SPARC only)") \ 1075 \ 1076 product(ccstr, SyncKnobs, NULL, \ 1077 "(Unstable) Various monitor synchronization tunables") \ 1078 \ 1079 product(intx, EmitSync, 0, \ 1080 "(Unsafe,Unstable) " \ 1081 " Controls emission of inline sync fast-path code") \ 1082 \ 1083 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1084 \ 1085 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1086 \ 1087 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1088 \ 1089 product(intx, Atomics, 0, \ 1090 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1091 \ 1092 product(intx, FenceInstruction, 0, \ 1093 "(Unsafe,Unstable) Experimental") \ 1094 \ 1095 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1096 \ 1097 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1098 \ 1099 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1100 \ 1101 product(intx, hashCode, 0, \ 1102 "(Unstable) select hashCode generation algorithm" ) \ 1103 \ 1104 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1105 "(Unstable, Linux-specific)" \ 1106 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1107 \ 1108 product(bool, FilterSpuriousWakeups, true, \ 1109 "Prevent spurious or premature wakeups from object.wait " \ 1110 "(Solaris only)") \ 1111 \ 1112 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1113 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1114 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1115 \ 1116 develop(bool, UsePthreads, false, \ 1117 "Use pthread-based instead of libthread-based synchronization " \ 1118 "(SPARC only)") \ 1119 \ 1120 product(bool, AdjustConcurrency, false, \ 1121 "call thr_setconcurrency at thread create time to avoid " \ 1122 "LWP starvation on MP systems (For Solaris Only)") \ 1123 \ 1124 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1125 "Should the system attempt to update the compiler file when " \ 1126 "an error occurs?") \ 1127 \ 1128 product(bool, ReduceSignalUsage, false, \ 1129 "Reduce the use of OS signals in Java and/or the VM") \ 1130 \ 1131 notproduct(bool, ValidateMarkSweep, false, \ 1132 "Do extra validation during MarkSweep collection") \ 1133 \ 1134 notproduct(bool, RecordMarkSweepCompaction, false, \ 1135 "Enable GC-to-GC recording and querying of compaction during " \ 1136 "MarkSweep") \ 1137 \ 1138 develop_pd(bool, ShareVtableStubs, \ 1139 "Share vtable stubs (smaller code but worse branch prediction") \ 1140 \ 1141 develop(bool, LoadLineNumberTables, true, \ 1142 "Tells whether the class file parser loads line number tables") \ 1143 \ 1144 develop(bool, LoadLocalVariableTables, true, \ 1145 "Tells whether the class file parser loads local variable tables")\ 1146 \ 1147 develop(bool, LoadLocalVariableTypeTables, true, \ 1148 "Tells whether the class file parser loads local variable type tables")\ 1149 \ 1150 product(bool, AllowUserSignalHandlers, false, \ 1151 "Do not complain if the application installs signal handlers " \ 1152 "(Solaris & Linux only)") \ 1153 \ 1154 product(bool, UseSignalChaining, true, \ 1155 "Use signal-chaining to invoke signal handlers installed " \ 1156 "by the application (Solaris & Linux only)") \ 1157 \ 1158 product(bool, UseAltSigs, false, \ 1159 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1160 "internal signals (Solaris only)") \ 1161 \ 1162 product(bool, UseSpinning, false, \ 1163 "Use spinning in monitor inflation and before entry") \ 1164 \ 1165 product(bool, PreSpinYield, false, \ 1166 "Yield before inner spinning loop") \ 1167 \ 1168 product(bool, PostSpinYield, true, \ 1169 "Yield after inner spinning loop") \ 1170 \ 1171 product(bool, AllowJNIEnvProxy, false, \ 1172 "Allow JNIEnv proxies for jdbx") \ 1173 \ 1174 product(bool, JNIDetachReleasesMonitors, true, \ 1175 "JNI DetachCurrentThread releases monitors owned by thread") \ 1176 \ 1177 product(bool, RestoreMXCSROnJNICalls, false, \ 1178 "Restore MXCSR when returning from JNI calls") \ 1179 \ 1180 product(bool, CheckJNICalls, false, \ 1181 "Verify all arguments to JNI calls") \ 1182 \ 1183 product(bool, UseFastJNIAccessors, true, \ 1184 "Use optimized versions of Get<Primitive>Field") \ 1185 \ 1186 product(bool, EagerXrunInit, false, \ 1187 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1188 " but not all -Xrun libraries may support the state of the VM at this time") \ 1189 \ 1190 product(bool, PreserveAllAnnotations, false, \ 1191 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1192 \ 1193 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1194 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1195 \ 1196 product(bool, LazyBootClassLoader, true, \ 1197 "Enable/disable lazy opening of boot class path entries") \ 1198 \ 1199 diagnostic(bool, UseIncDec, true, \ 1200 "Use INC, DEC instructions on x86") \ 1201 \ 1202 product(bool, UseNewLongLShift, false, \ 1203 "Use optimized bitwise shift left") \ 1204 \ 1205 product(bool, UseStoreImmI16, true, \ 1206 "Use store immediate 16-bits value instruction on x86") \ 1207 \ 1208 product(bool, UseAddressNop, false, \ 1209 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1210 \ 1211 product(bool, UseXmmLoadAndClearUpper, true, \ 1212 "Load low part of XMM register and clear upper part") \ 1213 \ 1214 product(bool, UseXmmRegToRegMoveAll, false, \ 1215 "Copy all XMM register bits when moving value between registers") \ 1216 \ 1217 product(bool, UseXmmI2D, false, \ 1218 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1219 \ 1220 product(bool, UseXmmI2F, false, \ 1221 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1222 \ 1223 product(bool, UseXMMForArrayCopy, false, \ 1224 "Use SSE2 MOVQ instruction for Arraycopy") \ 1225 \ 1226 product(bool, UseUnalignedLoadStores, false, \ 1227 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1228 \ 1229 product(bool, UseCBCond, false, \ 1230 "Use compare and branch instruction on SPARC") \ 1231 \ 1232 product(intx, FieldsAllocationStyle, 1, \ 1233 "0 - type based with oops first, 1 - with oops last, " \ 1234 "2 - oops in super and sub classes are together") \ 1235 \ 1236 product(bool, CompactFields, true, \ 1237 "Allocate nonstatic fields in gaps between previous fields") \ 1238 \ 1239 notproduct(bool, PrintCompactFieldsSavings, false, \ 1240 "Print how many words were saved with CompactFields") \ 1241 \ 1242 product(bool, UseBiasedLocking, true, \ 1243 "Enable biased locking in JVM") \ 1244 \ 1245 product(intx, BiasedLockingStartupDelay, 4000, \ 1246 "Number of milliseconds to wait before enabling biased locking") \ 1247 \ 1248 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1249 "Print statistics of biased locking in JVM") \ 1250 \ 1251 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1252 "Threshold of number of revocations per type to try to " \ 1253 "rebias all objects in the heap of that type") \ 1254 \ 1255 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1256 "Threshold of number of revocations per type to permanently " \ 1257 "revoke biases of all objects in the heap of that type") \ 1258 \ 1259 product(intx, BiasedLockingDecayTime, 25000, \ 1260 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1261 "type after previous bulk rebias") \ 1262 \ 1263 develop(bool, JavaObjectsInPerm, false, \ 1264 "controls whether Classes and interned Strings are allocated" \ 1265 "in perm. This purely intended to allow debugging issues" \ 1266 "in production.") \ 1267 \ 1268 /* tracing */ \ 1269 \ 1270 notproduct(bool, TraceRuntimeCalls, false, \ 1271 "Trace run-time calls") \ 1272 \ 1273 develop(bool, TraceJNICalls, false, \ 1274 "Trace JNI calls") \ 1275 \ 1276 notproduct(bool, TraceJVMCalls, false, \ 1277 "Trace JVM calls") \ 1278 \ 1279 product(ccstr, TraceJVMTI, NULL, \ 1280 "Trace flags for JVMTI functions and events") \ 1281 \ 1282 /* This option can change an EMCP method into an obsolete method. */ \ 1283 /* This can affect tests that except specific methods to be EMCP. */ \ 1284 /* This option should be used with caution. */ \ 1285 product(bool, StressLdcRewrite, false, \ 1286 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1287 \ 1288 product(intx, TraceRedefineClasses, 0, \ 1289 "Trace level for JVMTI RedefineClasses") \ 1290 \ 1291 develop(bool, StressMethodComparator, false, \ 1292 "run the MethodComparator on all loaded methods") \ 1293 \ 1294 /* change to false by default sometime after Mustang */ \ 1295 product(bool, VerifyMergedCPBytecodes, true, \ 1296 "Verify bytecodes after RedefineClasses constant pool merging") \ 1297 \ 1298 develop(bool, TraceJNIHandleAllocation, false, \ 1299 "Trace allocation/deallocation of JNI handle blocks") \ 1300 \ 1301 develop(bool, TraceThreadEvents, false, \ 1302 "Trace all thread events") \ 1303 \ 1304 develop(bool, TraceBytecodes, false, \ 1305 "Trace bytecode execution") \ 1306 \ 1307 develop(bool, TraceClassInitialization, false, \ 1308 "Trace class initialization") \ 1309 \ 1310 develop(bool, TraceExceptions, false, \ 1311 "Trace exceptions") \ 1312 \ 1313 develop(bool, TraceICs, false, \ 1314 "Trace inline cache changes") \ 1315 \ 1316 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1317 "Trace method invocation counter overflow") \ 1318 \ 1319 develop(bool, TraceInlineCacheClearing, false, \ 1320 "Trace clearing of inline caches in nmethods") \ 1321 \ 1322 develop(bool, TraceDependencies, false, \ 1323 "Trace dependencies") \ 1324 \ 1325 develop(bool, VerifyDependencies, trueInDebug, \ 1326 "Exercise and verify the compilation dependency mechanism") \ 1327 \ 1328 develop(bool, TraceNewOopMapGeneration, false, \ 1329 "Trace OopMapGeneration") \ 1330 \ 1331 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1332 "Trace OopMapGeneration: print detailed cell states") \ 1333 \ 1334 develop(bool, TimeOopMap, false, \ 1335 "Time calls to GenerateOopMap::compute_map() in sum") \ 1336 \ 1337 develop(bool, TimeOopMap2, false, \ 1338 "Time calls to GenerateOopMap::compute_map() individually") \ 1339 \ 1340 develop(bool, TraceMonitorMismatch, false, \ 1341 "Trace monitor matching failures during OopMapGeneration") \ 1342 \ 1343 develop(bool, TraceOopMapRewrites, false, \ 1344 "Trace rewritting of method oops during oop map generation") \ 1345 \ 1346 develop(bool, TraceSafepoint, false, \ 1347 "Trace safepoint operations") \ 1348 \ 1349 develop(bool, TraceICBuffer, false, \ 1350 "Trace usage of IC buffer") \ 1351 \ 1352 develop(bool, TraceCompiledIC, false, \ 1353 "Trace changes of compiled IC") \ 1354 \ 1355 notproduct(bool, TraceZapDeadLocals, false, \ 1356 "Trace zapping dead locals") \ 1357 \ 1358 develop(bool, TraceStartupTime, false, \ 1359 "Trace setup time") \ 1360 \ 1361 product(ccstr, HPILibPath, NULL, \ 1362 "Specify alternate path to HPI library") \ 1363 \ 1364 develop(bool, TraceProtectionDomainVerification, false, \ 1365 "Trace protection domain verifcation") \ 1366 \ 1367 develop(bool, TraceClearedExceptions, false, \ 1368 "Prints when an exception is forcibly cleared") \ 1369 \ 1370 product(bool, TraceClassResolution, false, \ 1371 "Trace all constant pool resolutions (for debugging)") \ 1372 \ 1373 product(bool, TraceBiasedLocking, false, \ 1374 "Trace biased locking in JVM") \ 1375 \ 1376 product(bool, TraceMonitorInflation, false, \ 1377 "Trace monitor inflation in JVM") \ 1378 \ 1379 /* assembler */ \ 1380 product(bool, Use486InstrsOnly, false, \ 1381 "Use 80486 Compliant instruction subset") \ 1382 \ 1383 /* gc */ \ 1384 \ 1385 product(bool, UseSerialGC, false, \ 1386 "Use the serial garbage collector") \ 1387 \ 1388 product(bool, UseG1GC, false, \ 1389 "Use the Garbage-First garbage collector") \ 1390 \ 1391 product(bool, UseParallelGC, false, \ 1392 "Use the Parallel Scavenge garbage collector") \ 1393 \ 1394 product(bool, UseParallelOldGC, false, \ 1395 "Use the Parallel Old garbage collector") \ 1396 \ 1397 product(uintx, HeapMaximumCompactionInterval, 20, \ 1398 "How often should we maximally compact the heap (not allowing " \ 1399 "any dead space)") \ 1400 \ 1401 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1402 "The collection count for the first maximum compaction") \ 1403 \ 1404 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1405 "In the Parallel Old garbage collector maximum compaction for " \ 1406 "a system GC") \ 1407 \ 1408 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1409 "The mean used by the par compact dead wood" \ 1410 "limiter (a number between 0-100).") \ 1411 \ 1412 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1413 "The standard deviation used by the par compact dead wood" \ 1414 "limiter (a number between 0-100).") \ 1415 \ 1416 product(uintx, ParallelGCThreads, 0, \ 1417 "Number of parallel threads parallel gc will use") \ 1418 \ 1419 develop(bool, ParallelOldGCSplitALot, false, \ 1420 "Provoke splitting (copying data from a young gen space to" \ 1421 "multiple destination spaces)") \ 1422 \ 1423 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1424 "How often to provoke splitting a young gen space") \ 1425 \ 1426 develop(bool, TraceRegionTasksQueuing, false, \ 1427 "Trace the queuing of the region tasks") \ 1428 \ 1429 product(uintx, ConcGCThreads, 0, \ 1430 "Number of threads concurrent gc will use") \ 1431 \ 1432 product(uintx, YoungPLABSize, 4096, \ 1433 "Size of young gen promotion labs (in HeapWords)") \ 1434 \ 1435 product(uintx, OldPLABSize, 1024, \ 1436 "Size of old gen promotion labs (in HeapWords)") \ 1437 \ 1438 product(uintx, GCTaskTimeStampEntries, 200, \ 1439 "Number of time stamp entries per gc worker thread") \ 1440 \ 1441 product(bool, AlwaysTenure, false, \ 1442 "Always tenure objects in eden. (ParallelGC only)") \ 1443 \ 1444 product(bool, NeverTenure, false, \ 1445 "Never tenure objects in eden, May tenure on overflow " \ 1446 "(ParallelGC only)") \ 1447 \ 1448 product(bool, ScavengeBeforeFullGC, true, \ 1449 "Scavenge youngest generation before each full GC, " \ 1450 "used with UseParallelGC") \ 1451 \ 1452 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1453 "Allow scavenges to occur when to_space contains objects.") \ 1454 \ 1455 product(bool, UseConcMarkSweepGC, false, \ 1456 "Use Concurrent Mark-Sweep GC in the old generation") \ 1457 \ 1458 product(bool, ExplicitGCInvokesConcurrent, false, \ 1459 "A System.gc() request invokes a concurrent collection;" \ 1460 " (effective only when UseConcMarkSweepGC)") \ 1461 \ 1462 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1463 "A System.gc() request invokes a concurrent collection and " \ 1464 "also unloads classes during such a concurrent gc cycle " \ 1465 "(effective only when UseConcMarkSweepGC)") \ 1466 \ 1467 product(bool, GCLockerInvokesConcurrent, false, \ 1468 "The exit of a JNI CS necessitating a scavenge also" \ 1469 " kicks off a bkgrd concurrent collection") \ 1470 \ 1471 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1472 "How much the GC can expand the eden by while the GC locker " \ 1473 "is active (as a percentage)") \ 1474 \ 1475 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1476 "Use Adaptive Free Lists in the CMS generation") \ 1477 \ 1478 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1479 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1480 \ 1481 develop(bool, RotateCMSCollectionTypes, false, \ 1482 "Rotate the CMS collections among concurrent and STW") \ 1483 \ 1484 product(bool, UseCMSBestFit, true, \ 1485 "Use CMS best fit allocation strategy") \ 1486 \ 1487 product(bool, UseCMSCollectionPassing, true, \ 1488 "Use passing of collection from background to foreground") \ 1489 \ 1490 product(bool, UseParNewGC, false, \ 1491 "Use parallel threads in the new generation.") \ 1492 \ 1493 product(bool, ParallelGCVerbose, false, \ 1494 "Verbose output for parallel GC.") \ 1495 \ 1496 product(intx, ParallelGCBufferWastePct, 10, \ 1497 "wasted fraction of parallel allocation buffer.") \ 1498 \ 1499 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1500 "Retain parallel allocation buffers across scavenges; " \ 1501 " -- disabled because this currently conflicts with " \ 1502 " parallel card scanning under certain conditions ") \ 1503 \ 1504 product(intx, TargetPLABWastePct, 10, \ 1505 "target wasted space in last buffer as pct of overall allocation")\ 1506 \ 1507 product(uintx, PLABWeight, 75, \ 1508 "Percentage (0-100) used to weight the current sample when" \ 1509 "computing exponentially decaying average for ResizePLAB.") \ 1510 \ 1511 product(bool, ResizePLAB, true, \ 1512 "Dynamically resize (survivor space) promotion labs") \ 1513 \ 1514 product(bool, PrintPLAB, false, \ 1515 "Print (survivor space) promotion labs sizing decisions") \ 1516 \ 1517 product(intx, ParGCArrayScanChunk, 50, \ 1518 "Scan a subset and push remainder, if array is bigger than this") \ 1519 \ 1520 product(bool, ParGCUseLocalOverflow, false, \ 1521 "Instead of a global overflow list, use local overflow stacks") \ 1522 \ 1523 product(bool, ParGCTrimOverflow, true, \ 1524 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1525 \ 1526 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1527 "Whether we should simulate work queue overflow in ParNew") \ 1528 \ 1529 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1530 "An `interval' counter that determines how frequently " \ 1531 "we simulate overflow; a smaller number increases frequency") \ 1532 \ 1533 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1534 "The desired number of objects to claim from the overflow list") \ 1535 \ 1536 diagnostic(intx, ParGCStridesPerThread, 2, \ 1537 "The number of strides per worker thread that we divide up the " \ 1538 "card table scanning work into") \ 1539 \ 1540 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1541 "The number of cards in each chunk of the parallel chunks used " \ 1542 "during card table scanning") \ 1543 \ 1544 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1545 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1546 "parallel GC.") \ 1547 \ 1548 product(uintx, OldPLABWeight, 50, \ 1549 "Percentage (0-100) used to weight the current sample when" \ 1550 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1551 \ 1552 product(bool, ResizeOldPLAB, true, \ 1553 "Dynamically resize (old gen) promotion labs") \ 1554 \ 1555 product(bool, PrintOldPLAB, false, \ 1556 "Print (old gen) promotion labs sizing decisions") \ 1557 \ 1558 product(uintx, CMSOldPLABMin, 16, \ 1559 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1560 \ 1561 product(uintx, CMSOldPLABMax, 1024, \ 1562 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1563 \ 1564 product(uintx, CMSOldPLABNumRefills, 4, \ 1565 "Nominal number of refills of CMS gen promotion lab cache" \ 1566 " per worker per block size") \ 1567 \ 1568 product(bool, CMSOldPLABResizeQuicker, false, \ 1569 "Whether to react on-the-fly during a scavenge to a sudden" \ 1570 " change in block demand rate") \ 1571 \ 1572 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1573 "The tolerance of the phase-change detector for on-the-fly" \ 1574 " PLAB resizing during a scavenge") \ 1575 \ 1576 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1577 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1578 " during a scavenge") \ 1579 \ 1580 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1581 "The clamping of the gain in the feedback loop for on-the-fly" \ 1582 " PLAB resizing during a scavenge") \ 1583 \ 1584 product(bool, AlwaysPreTouch, false, \ 1585 "It forces all freshly committed pages to be pre-touched.") \ 1586 \ 1587 product_pd(intx, CMSYoungGenPerWorker, \ 1588 "The maximum size of young gen chosen by default per GC worker " \ 1589 "thread available") \ 1590 \ 1591 product(bool, GCOverheadReporting, false, \ 1592 "Enables the GC overhead reporting facility") \ 1593 \ 1594 product(intx, GCOverheadReportingPeriodMS, 100, \ 1595 "Reporting period for conc GC overhead reporting, in ms ") \ 1596 \ 1597 product(bool, CMSIncrementalMode, false, \ 1598 "Whether CMS GC should operate in \"incremental\" mode") \ 1599 \ 1600 product(uintx, CMSIncrementalDutyCycle, 10, \ 1601 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1602 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1603 "value") \ 1604 \ 1605 product(bool, CMSIncrementalPacing, true, \ 1606 "Whether the CMS incremental mode duty cycle should be " \ 1607 "automatically adjusted") \ 1608 \ 1609 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1610 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1611 "enabled (a percentage, 0-100)") \ 1612 \ 1613 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1614 "Percentage (0-100) used to add conservatism when computing the " \ 1615 "duty cycle") \ 1616 \ 1617 product(uintx, CMSIncrementalOffset, 0, \ 1618 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1619 " is shifted to the right within the period between young GCs") \ 1620 \ 1621 product(uintx, CMSExpAvgFactor, 50, \ 1622 "Percentage (0-100) used to weight the current sample when" \ 1623 "computing exponential averages for CMS statistics.") \ 1624 \ 1625 product(uintx, CMS_FLSWeight, 75, \ 1626 "Percentage (0-100) used to weight the current sample when" \ 1627 "computing exponentially decating averages for CMS FLS statistics.") \ 1628 \ 1629 product(uintx, CMS_FLSPadding, 1, \ 1630 "The multiple of deviation from mean to use for buffering" \ 1631 "against volatility in free list demand.") \ 1632 \ 1633 product(uintx, FLSCoalescePolicy, 2, \ 1634 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1635 \ 1636 product(bool, FLSAlwaysCoalesceLarge, false, \ 1637 "CMS: Larger free blocks are always available for coalescing") \ 1638 \ 1639 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1640 "CMS: the smaller the percentage the greater the coalition force")\ 1641 \ 1642 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1643 "CMS: the factor by which to inflate estimated demand of small" \ 1644 " block sizes to prevent coalescing with an adjoining block") \ 1645 \ 1646 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1647 "CMS: the factor by which to inflate estimated demand of large" \ 1648 " block sizes to prevent coalescing with an adjoining block") \ 1649 \ 1650 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1651 "CMS: the factor by which to inflate estimated demand of small" \ 1652 " block sizes to prevent splitting to supply demand for smaller" \ 1653 " blocks") \ 1654 \ 1655 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1656 "CMS: the factor by which to inflate estimated demand of large" \ 1657 " block sizes to prevent splitting to supply demand for smaller" \ 1658 " blocks") \ 1659 \ 1660 product(bool, CMSExtrapolateSweep, false, \ 1661 "CMS: cushion for block demand during sweep") \ 1662 \ 1663 product(uintx, CMS_SweepWeight, 75, \ 1664 "Percentage (0-100) used to weight the current sample when " \ 1665 "computing exponentially decaying average for inter-sweep " \ 1666 "duration") \ 1667 \ 1668 product(uintx, CMS_SweepPadding, 1, \ 1669 "The multiple of deviation from mean to use for buffering " \ 1670 "against volatility in inter-sweep duration.") \ 1671 \ 1672 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1673 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1674 "duration exceeds this threhold in milliseconds") \ 1675 \ 1676 develop(bool, CMSTraceIncrementalMode, false, \ 1677 "Trace CMS incremental mode") \ 1678 \ 1679 develop(bool, CMSTraceIncrementalPacing, false, \ 1680 "Trace CMS incremental mode pacing computation") \ 1681 \ 1682 develop(bool, CMSTraceThreadState, false, \ 1683 "Trace the CMS thread state (enable the trace_state() method)") \ 1684 \ 1685 product(bool, CMSClassUnloadingEnabled, false, \ 1686 "Whether class unloading enabled when using CMS GC") \ 1687 \ 1688 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1689 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1690 " for which classes may not be unloaded") \ 1691 \ 1692 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1693 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1694 \ 1695 product(bool, UseCMSCompactAtFullCollection, true, \ 1696 "Use mark sweep compact at full collections") \ 1697 \ 1698 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1699 "Number of CMS full collection done before compaction if > 0") \ 1700 \ 1701 develop(intx, CMSDictionaryChoice, 0, \ 1702 "Use BinaryTreeDictionary as default in the CMS generation") \ 1703 \ 1704 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1705 "Replenish an indexed free list with this number of chunks") \ 1706 \ 1707 product(bool, CMSReplenishIntermediate, true, \ 1708 "Replenish all intermediate free-list caches") \ 1709 \ 1710 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1711 "When satisfying batched demand, split blocks from the " \ 1712 "IndexedFreeList whose size is a multiple of requested size") \ 1713 \ 1714 product(bool, CMSLoopWarn, false, \ 1715 "Warn in case of excessive CMS looping") \ 1716 \ 1717 develop(bool, CMSOverflowEarlyRestoration, false, \ 1718 "Whether preserved marks should be restored early") \ 1719 \ 1720 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1721 "Size of marking stack") \ 1722 \ 1723 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1724 "Max size of marking stack") \ 1725 \ 1726 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1727 "Whether we should simulate frequent marking stack / work queue" \ 1728 " overflow") \ 1729 \ 1730 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1731 "An `interval' counter that determines how frequently" \ 1732 " we simulate overflow; a smaller number increases frequency") \ 1733 \ 1734 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1735 "(Temporary, subject to experimentation)" \ 1736 "Maximum number of abortable preclean iterations, if > 0") \ 1737 \ 1738 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1739 "(Temporary, subject to experimentation)" \ 1740 "Maximum time in abortable preclean in ms") \ 1741 \ 1742 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1743 "(Temporary, subject to experimentation)" \ 1744 "Nominal minimum work per abortable preclean iteration") \ 1745 \ 1746 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1747 "(Temporary, subject to experimentation)" \ 1748 " Time that we sleep between iterations when not given" \ 1749 " enough work per iteration") \ 1750 \ 1751 product(uintx, CMSRescanMultiple, 32, \ 1752 "Size (in cards) of CMS parallel rescan task") \ 1753 \ 1754 product(uintx, CMSConcMarkMultiple, 32, \ 1755 "Size (in cards) of CMS concurrent MT marking task") \ 1756 \ 1757 product(uintx, CMSRevisitStackSize, 1*M, \ 1758 "Size of CMS KlassKlass revisit stack") \ 1759 \ 1760 product(bool, CMSAbortSemantics, false, \ 1761 "Whether abort-on-overflow semantics is implemented") \ 1762 \ 1763 product(bool, CMSParallelRemarkEnabled, true, \ 1764 "Whether parallel remark enabled (only if ParNewGC)") \ 1765 \ 1766 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1767 "Whether parallel remark of survivor space" \ 1768 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1769 \ 1770 product(bool, CMSPLABRecordAlways, true, \ 1771 "Whether to always record survivor space PLAB bdries" \ 1772 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1773 \ 1774 product(bool, CMSConcurrentMTEnabled, true, \ 1775 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1776 \ 1777 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1778 "Whether concurrent precleaning enabled in perm gen" \ 1779 " (effective only when CMSPrecleaningEnabled is true)") \ 1780 \ 1781 product(bool, CMSPrecleaningEnabled, true, \ 1782 "Whether concurrent precleaning enabled") \ 1783 \ 1784 product(uintx, CMSPrecleanIter, 3, \ 1785 "Maximum number of precleaning iteration passes") \ 1786 \ 1787 product(uintx, CMSPrecleanNumerator, 2, \ 1788 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1789 " ratio") \ 1790 \ 1791 product(uintx, CMSPrecleanDenominator, 3, \ 1792 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1793 " ratio") \ 1794 \ 1795 product(bool, CMSPrecleanRefLists1, true, \ 1796 "Preclean ref lists during (initial) preclean phase") \ 1797 \ 1798 product(bool, CMSPrecleanRefLists2, false, \ 1799 "Preclean ref lists during abortable preclean phase") \ 1800 \ 1801 product(bool, CMSPrecleanSurvivors1, false, \ 1802 "Preclean survivors during (initial) preclean phase") \ 1803 \ 1804 product(bool, CMSPrecleanSurvivors2, true, \ 1805 "Preclean survivors during abortable preclean phase") \ 1806 \ 1807 product(uintx, CMSPrecleanThreshold, 1000, \ 1808 "Don't re-iterate if #dirty cards less than this") \ 1809 \ 1810 product(bool, CMSCleanOnEnter, true, \ 1811 "Clean-on-enter optimization for reducing number of dirty cards") \ 1812 \ 1813 product(uintx, CMSRemarkVerifyVariant, 1, \ 1814 "Choose variant (1,2) of verification following remark") \ 1815 \ 1816 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1817 "If Eden used is below this value, don't try to schedule remark") \ 1818 \ 1819 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1820 "The Eden occupancy % at which to try and schedule remark pause") \ 1821 \ 1822 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1823 "Start sampling Eden top at least before yg occupancy reaches" \ 1824 " 1/<ratio> of the size at which we plan to schedule remark") \ 1825 \ 1826 product(uintx, CMSSamplingGrain, 16*K, \ 1827 "The minimum distance between eden samples for CMS (see above)") \ 1828 \ 1829 product(bool, CMSScavengeBeforeRemark, false, \ 1830 "Attempt scavenge before the CMS remark step") \ 1831 \ 1832 develop(bool, CMSTraceSweeper, false, \ 1833 "Trace some actions of the CMS sweeper") \ 1834 \ 1835 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1836 "Don't drain below this size per parallel worker/thief") \ 1837 \ 1838 manageable(intx, CMSWaitDuration, 2000, \ 1839 "Time in milliseconds that CMS thread waits for young GC") \ 1840 \ 1841 product(bool, CMSYield, true, \ 1842 "Yield between steps of concurrent mark & sweep") \ 1843 \ 1844 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1845 "Bitmap operations should process at most this many bits" \ 1846 "between yields") \ 1847 \ 1848 product(bool, CMSDumpAtPromotionFailure, false, \ 1849 "Dump useful information about the state of the CMS old " \ 1850 " generation upon a promotion failure.") \ 1851 \ 1852 product(bool, CMSPrintChunksInDump, false, \ 1853 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1854 " more detailed information about the free chunks.") \ 1855 \ 1856 product(bool, CMSPrintObjectsInDump, false, \ 1857 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1858 " more detailed information about the allocated objects.") \ 1859 \ 1860 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1861 "Verify that all refs across the FLS boundary " \ 1862 " are to valid objects") \ 1863 \ 1864 diagnostic(bool, FLSVerifyLists, false, \ 1865 "Do lots of (expensive) FreeListSpace verification") \ 1866 \ 1867 diagnostic(bool, FLSVerifyIndexTable, false, \ 1868 "Do lots of (expensive) FLS index table verification") \ 1869 \ 1870 develop(bool, FLSVerifyDictionary, false, \ 1871 "Do lots of (expensive) FLS dictionary verification") \ 1872 \ 1873 develop(bool, VerifyBlockOffsetArray, false, \ 1874 "Do (expensive!) block offset array verification") \ 1875 \ 1876 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1877 "Maintain _unallocated_block in BlockOffsetArray" \ 1878 " (currently applicable only to CMS collector)") \ 1879 \ 1880 develop(bool, TraceCMSState, false, \ 1881 "Trace the state of the CMS collection") \ 1882 \ 1883 product(intx, RefDiscoveryPolicy, 0, \ 1884 "Whether reference-based(0) or referent-based(1)") \ 1885 \ 1886 product(bool, ParallelRefProcEnabled, false, \ 1887 "Enable parallel reference processing whenever possible") \ 1888 \ 1889 product(bool, ParallelRefProcBalancingEnabled, true, \ 1890 "Enable balancing of reference processing queues") \ 1891 \ 1892 product(intx, CMSTriggerRatio, 80, \ 1893 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1894 "allocated before a CMS collection cycle commences") \ 1895 \ 1896 product(intx, CMSTriggerPermRatio, 80, \ 1897 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1898 "is allocated before a CMS collection cycle commences, that " \ 1899 "also collects the perm generation") \ 1900 \ 1901 product(uintx, CMSBootstrapOccupancy, 50, \ 1902 "Percentage CMS generation occupancy at which to " \ 1903 "initiate CMS collection for bootstrapping collection stats") \ 1904 \ 1905 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1906 "Percentage CMS generation occupancy to start a CMS collection " \ 1907 "cycle. A negative value means that CMSTriggerRatio is used") \ 1908 \ 1909 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1910 "Percentage of the (entire) heap occupancy to start a " \ 1911 "concurrent GC cycle. It us used by GCs that trigger a " \ 1912 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1913 "not just one of the generations (e.g., G1). A value of 0 " \ 1914 "denotes 'do constant GC cycles'.") \ 1915 \ 1916 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1917 "Percentage CMS perm generation occupancy to start a " \ 1918 "CMScollection cycle. A negative value means that " \ 1919 "CMSTriggerPermRatio is used") \ 1920 \ 1921 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1922 "Only use occupancy as a crierion for starting a CMS collection") \ 1923 \ 1924 product(intx, CMSIsTooFullPercentage, 98, \ 1925 "An absolute ceiling above which CMS will always consider the " \ 1926 "perm gen ripe for collection") \ 1927 \ 1928 develop(bool, CMSTestInFreeList, false, \ 1929 "Check if the coalesced range is already in the " \ 1930 "free lists as claimed") \ 1931 \ 1932 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1933 "Check that all the garbage collected was returned to the " \ 1934 "free lists.") \ 1935 \ 1936 notproduct(bool, ScavengeALot, false, \ 1937 "Force scavenge at every Nth exit from the runtime system " \ 1938 "(N=ScavengeALotInterval)") \ 1939 \ 1940 develop(bool, FullGCALot, false, \ 1941 "Force full gc at every Nth exit from the runtime system " \ 1942 "(N=FullGCALotInterval)") \ 1943 \ 1944 notproduct(bool, GCALotAtAllSafepoints, false, \ 1945 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1946 \ 1947 product(bool, PrintPromotionFailure, false, \ 1948 "Print additional diagnostic information following " \ 1949 " promotion failure") \ 1950 \ 1951 notproduct(bool, PromotionFailureALot, false, \ 1952 "Use promotion failure handling on every youngest generation " \ 1953 "collection") \ 1954 \ 1955 develop(uintx, PromotionFailureALotCount, 1000, \ 1956 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1957 "refill attempts (ParNew) or promotion attempts " \ 1958 "(other young collectors) ") \ 1959 \ 1960 develop(uintx, PromotionFailureALotInterval, 5, \ 1961 "Total collections between promotion failures alot") \ 1962 \ 1963 experimental(intx, WorkStealingSleepMillis, 1, \ 1964 "Sleep time when sleep is used for yields") \ 1965 \ 1966 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1967 "Number of yields before a sleep is done during workstealing") \ 1968 \ 1969 experimental(uintx, WorkStealingHardSpins, 4096, \ 1970 "Number of iterations in a spin loop between checks on " \ 1971 "time out of hard spin") \ 1972 \ 1973 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1974 "Ratio of hard spins to calls to yield") \ 1975 \ 1976 product(uintx, PreserveMarkStackSize, 1024, \ 1977 "Size for stack used in promotion failure handling") \ 1978 \ 1979 develop(uintx, ObjArrayMarkingStride, 512, \ 1980 "Number of ObjArray elements to push onto the marking stack" \ 1981 "before pushing a continuation entry") \ 1982 \ 1983 notproduct(bool, ExecuteInternalVMTests, false, \ 1984 "Enable execution of internal VM tests.") \ 1985 \ 1986 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1987 \ 1988 product_pd(bool, ResizeTLAB, \ 1989 "Dynamically resize tlab size for threads") \ 1990 \ 1991 product(bool, ZeroTLAB, false, \ 1992 "Zero out the newly created TLAB") \ 1993 \ 1994 product(bool, FastTLABRefill, true, \ 1995 "Use fast TLAB refill code") \ 1996 \ 1997 product(bool, PrintTLAB, false, \ 1998 "Print various TLAB related information") \ 1999 \ 2000 product(bool, TLABStats, true, \ 2001 "Print various TLAB related information") \ 2002 \ 2003 product(bool, UseBlockZeroing, false, \ 2004 "Use special cpu instructions for block zeroing") \ 2005 \ 2006 product(intx, BlockZeroingLowLimit, 2048, \ 2007 "Minimum size in bytes when block zeroing will be used") \ 2008 \ 2009 product(bool, UseBlockCopy, false, \ 2010 "Use special cpu instructions for block copy") \ 2011 \ 2012 product(intx, BlockCopyLowLimit, 2048, \ 2013 "Minimum size in bytes when block copy will be used") \ 2014 \ 2015 product(bool, PrintRevisitStats, false, \ 2016 "Print revisit (klass and MDO) stack related information") \ 2017 \ 2018 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2019 "Enable LowMemoryProtection")) \ 2020 \ 2021 product_pd(bool, NeverActAsServerClassMachine, \ 2022 "Never act like a server-class machine") \ 2023 \ 2024 product(bool, AlwaysActAsServerClassMachine, false, \ 2025 "Always act like a server-class machine") \ 2026 \ 2027 product_pd(uint64_t, MaxRAM, \ 2028 "Real memory size (in bytes) used to set maximum heap size") \ 2029 \ 2030 product(uintx, ErgoHeapSizeLimit, 0, \ 2031 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2032 "MaxRAM / MaxRAMFraction") \ 2033 \ 2034 product(uintx, MaxRAMFraction, 4, \ 2035 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2036 "size") \ 2037 \ 2038 product(uintx, DefaultMaxRAMFraction, 4, \ 2039 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2040 "size; deprecated: to be renamed to MaxRAMFraction") \ 2041 \ 2042 product(uintx, MinRAMFraction, 2, \ 2043 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2044 "size on systems with small physical memory size") \ 2045 \ 2046 product(uintx, InitialRAMFraction, 64, \ 2047 "Fraction (1/n) of real memory used for initial heap size") \ 2048 \ 2049 product(bool, UseAutoGCSelectPolicy, false, \ 2050 "Use automatic collection selection policy") \ 2051 \ 2052 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2053 "Automatic GC selection pause threshhold in ms") \ 2054 \ 2055 product(bool, UseAdaptiveSizePolicy, true, \ 2056 "Use adaptive generation sizing policies") \ 2057 \ 2058 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2059 "Use adaptive survivor sizing policies") \ 2060 \ 2061 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2062 "Use adaptive young-old sizing policies at minor collections") \ 2063 \ 2064 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2065 "Use adaptive young-old sizing policies at major collections") \ 2066 \ 2067 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2068 "Use statistics from System.GC for adaptive size policy") \ 2069 \ 2070 product(bool, UseAdaptiveGCBoundary, false, \ 2071 "Allow young-old boundary to move") \ 2072 \ 2073 develop(bool, TraceAdaptiveGCBoundary, false, \ 2074 "Trace young-old boundary moves") \ 2075 \ 2076 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2077 "Resize the virtual spaces of the young or old generations") \ 2078 \ 2079 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2080 "Policy for changeing generation size for throughput goals") \ 2081 \ 2082 product(uintx, AdaptiveSizePausePolicy, 0, \ 2083 "Policy for changing generation size for pause goals") \ 2084 \ 2085 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2086 "Adjust tenured generation to achive a minor pause goal") \ 2087 \ 2088 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2089 "Adjust young generation to achive a major pause goal") \ 2090 \ 2091 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2092 "Number of steps where heuristics is used before data is used") \ 2093 \ 2094 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2095 "Number of collections before the adaptive sizing is started") \ 2096 \ 2097 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2098 "Collecton interval for printing information; zero => never") \ 2099 \ 2100 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2101 "Use adaptive minimum footprint as a goal") \ 2102 \ 2103 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2104 "Weight given to exponential resizing, between 0 and 100") \ 2105 \ 2106 product(uintx, AdaptiveTimeWeight, 25, \ 2107 "Weight given to time in adaptive policy, between 0 and 100") \ 2108 \ 2109 product(uintx, PausePadding, 1, \ 2110 "How much buffer to keep for pause time") \ 2111 \ 2112 product(uintx, PromotedPadding, 3, \ 2113 "How much buffer to keep for promotion failure") \ 2114 \ 2115 product(uintx, SurvivorPadding, 3, \ 2116 "How much buffer to keep for survivor overflow") \ 2117 \ 2118 product(uintx, AdaptivePermSizeWeight, 20, \ 2119 "Weight for perm gen exponential resizing, between 0 and 100") \ 2120 \ 2121 product(uintx, PermGenPadding, 3, \ 2122 "How much buffer to keep for perm gen sizing") \ 2123 \ 2124 product(uintx, ThresholdTolerance, 10, \ 2125 "Allowed collection cost difference between generations") \ 2126 \ 2127 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2128 "If collection costs are within margin, reduce both by full " \ 2129 "delta") \ 2130 \ 2131 product(uintx, YoungGenerationSizeIncrement, 20, \ 2132 "Adaptive size percentage change in young generation") \ 2133 \ 2134 product(uintx, YoungGenerationSizeSupplement, 80, \ 2135 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2136 \ 2137 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2138 "Decay factor to YoungedGenerationSizeSupplement") \ 2139 \ 2140 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2141 "Adaptive size percentage change in tenured generation") \ 2142 \ 2143 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2144 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2145 \ 2146 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2147 "Decay factor to TenuredGenerationSizeIncrement") \ 2148 \ 2149 product(uintx, MaxGCPauseMillis, max_uintx, \ 2150 "Adaptive size policy maximum GC pause time goal in msec, " \ 2151 "or (G1 Only) the max. GC time per MMU time slice") \ 2152 \ 2153 product(uintx, GCPauseIntervalMillis, 0, \ 2154 "Time slice for MMU specification") \ 2155 \ 2156 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2157 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2158 \ 2159 product(uintx, GCTimeRatio, 99, \ 2160 "Adaptive size policy application time to GC time ratio") \ 2161 \ 2162 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2163 "Adaptive size scale down factor for shrinking") \ 2164 \ 2165 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2166 "Adaptive size decays the major cost for long major intervals") \ 2167 \ 2168 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2169 "Time scale over which major costs decay") \ 2170 \ 2171 product(uintx, MinSurvivorRatio, 3, \ 2172 "Minimum ratio of young generation/survivor space size") \ 2173 \ 2174 product(uintx, InitialSurvivorRatio, 8, \ 2175 "Initial ratio of eden/survivor space size") \ 2176 \ 2177 product(uintx, BaseFootPrintEstimate, 256*M, \ 2178 "Estimate of footprint other than Java Heap") \ 2179 \ 2180 product(bool, UseGCOverheadLimit, true, \ 2181 "Use policy to limit of proportion of time spent in GC " \ 2182 "before an OutOfMemory error is thrown") \ 2183 \ 2184 product(uintx, GCTimeLimit, 98, \ 2185 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2186 "error is thrown (used with GCHeapFreeLimit)") \ 2187 \ 2188 product(uintx, GCHeapFreeLimit, 2, \ 2189 "Minimum percentage of free space after a full GC before an " \ 2190 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2191 \ 2192 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2193 "Number of consecutive collections before gc time limit fires") \ 2194 \ 2195 product(bool, PrintAdaptiveSizePolicy, false, \ 2196 "Print information about AdaptiveSizePolicy") \ 2197 \ 2198 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2199 "How far ahead to prefetch destination area (<= 0 means off)") \ 2200 \ 2201 product(intx, PrefetchScanIntervalInBytes, -1, \ 2202 "How far ahead to prefetch scan area (<= 0 means off)") \ 2203 \ 2204 product(intx, PrefetchFieldsAhead, -1, \ 2205 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2206 \ 2207 develop(bool, UsePrefetchQueue, true, \ 2208 "Use the prefetch queue during PS promotion") \ 2209 \ 2210 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2211 "Verify system before exiting") \ 2212 \ 2213 diagnostic(bool, VerifyBeforeGC, false, \ 2214 "Verify memory system before GC") \ 2215 \ 2216 diagnostic(bool, VerifyAfterGC, false, \ 2217 "Verify memory system after GC") \ 2218 \ 2219 diagnostic(bool, VerifyDuringGC, false, \ 2220 "Verify memory system during GC (between phases)") \ 2221 \ 2222 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2223 "Enable parallel memory system verification") \ 2224 \ 2225 diagnostic(bool, DeferInitialCardMark, false, \ 2226 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2227 "may arise from new_pre_store_barrier") \ 2228 \ 2229 diagnostic(bool, VerifyRememberedSets, false, \ 2230 "Verify GC remembered sets") \ 2231 \ 2232 diagnostic(bool, VerifyObjectStartArray, true, \ 2233 "Verify GC object start array if verify before/after") \ 2234 \ 2235 product(bool, DisableExplicitGC, false, \ 2236 "Tells whether calling System.gc() does a full GC") \ 2237 \ 2238 notproduct(bool, CheckMemoryInitialization, false, \ 2239 "Checks memory initialization") \ 2240 \ 2241 product(bool, CollectGen0First, false, \ 2242 "Collect youngest generation before each full GC") \ 2243 \ 2244 diagnostic(bool, BindCMSThreadToCPU, false, \ 2245 "Bind CMS Thread to CPU if possible") \ 2246 \ 2247 diagnostic(uintx, CPUForCMSThread, 0, \ 2248 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2249 \ 2250 product(bool, BindGCTaskThreadsToCPUs, false, \ 2251 "Bind GCTaskThreads to CPUs if possible") \ 2252 \ 2253 product(bool, UseGCTaskAffinity, false, \ 2254 "Use worker affinity when asking for GCTasks") \ 2255 \ 2256 product(uintx, ProcessDistributionStride, 4, \ 2257 "Stride through processors when distributing processes") \ 2258 \ 2259 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2260 "number of times the coordinator GC thread will sleep while " \ 2261 "yielding before giving up and resuming GC") \ 2262 \ 2263 product(uintx, CMSYieldSleepCount, 0, \ 2264 "number of times a GC thread (minus the coordinator) " \ 2265 "will sleep while yielding before giving up and resuming GC") \ 2266 \ 2267 /* gc tracing */ \ 2268 manageable(bool, PrintGC, false, \ 2269 "Print message at garbage collect") \ 2270 \ 2271 manageable(bool, PrintGCDetails, false, \ 2272 "Print more details at garbage collect") \ 2273 \ 2274 manageable(bool, PrintGCDateStamps, false, \ 2275 "Print date stamps at garbage collect") \ 2276 \ 2277 manageable(bool, PrintGCTimeStamps, false, \ 2278 "Print timestamps at garbage collect") \ 2279 \ 2280 product(bool, PrintGCTaskTimeStamps, false, \ 2281 "Print timestamps for individual gc worker thread tasks") \ 2282 \ 2283 develop(intx, ConcGCYieldTimeout, 0, \ 2284 "If non-zero, assert that GC threads yield within this # of ms.") \ 2285 \ 2286 notproduct(bool, TraceMarkSweep, false, \ 2287 "Trace mark sweep") \ 2288 \ 2289 product(bool, PrintReferenceGC, false, \ 2290 "Print times spent handling reference objects during GC " \ 2291 " (enabled only when PrintGCDetails)") \ 2292 \ 2293 develop(bool, TraceReferenceGC, false, \ 2294 "Trace handling of soft/weak/final/phantom references") \ 2295 \ 2296 develop(bool, TraceFinalizerRegistration, false, \ 2297 "Trace registration of final references") \ 2298 \ 2299 notproduct(bool, TraceScavenge, false, \ 2300 "Trace scavenge") \ 2301 \ 2302 product_rw(bool, TraceClassLoading, false, \ 2303 "Trace all classes loaded") \ 2304 \ 2305 product(bool, TraceClassLoadingPreorder, false, \ 2306 "Trace all classes loaded in order referenced (not loaded)") \ 2307 \ 2308 product_rw(bool, TraceClassUnloading, false, \ 2309 "Trace unloading of classes") \ 2310 \ 2311 product_rw(bool, TraceLoaderConstraints, false, \ 2312 "Trace loader constraints") \ 2313 \ 2314 product(bool, TraceGen0Time, false, \ 2315 "Trace accumulated time for Gen 0 collection") \ 2316 \ 2317 product(bool, TraceGen1Time, false, \ 2318 "Trace accumulated time for Gen 1 collection") \ 2319 \ 2320 product(bool, PrintTenuringDistribution, false, \ 2321 "Print tenuring age information") \ 2322 \ 2323 product_rw(bool, PrintHeapAtGC, false, \ 2324 "Print heap layout before and after each GC") \ 2325 \ 2326 product_rw(bool, PrintHeapAtGCExtended, false, \ 2327 "Prints extended information about the layout of the heap " \ 2328 "when -XX:+PrintHeapAtGC is set") \ 2329 \ 2330 product(bool, PrintHeapAtSIGBREAK, true, \ 2331 "Print heap layout in response to SIGBREAK") \ 2332 \ 2333 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2334 "Print a class histogram before any major stop-world GC") \ 2335 \ 2336 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2337 "Print a class histogram after any major stop-world GC") \ 2338 \ 2339 manageable(bool, PrintClassHistogram, false, \ 2340 "Print a histogram of class instances") \ 2341 \ 2342 develop(bool, TraceWorkGang, false, \ 2343 "Trace activities of work gangs") \ 2344 \ 2345 product(bool, TraceParallelOldGCTasks, false, \ 2346 "Trace multithreaded GC activity") \ 2347 \ 2348 develop(bool, TraceBlockOffsetTable, false, \ 2349 "Print BlockOffsetTable maps") \ 2350 \ 2351 develop(bool, TraceCardTableModRefBS, false, \ 2352 "Print CardTableModRefBS maps") \ 2353 \ 2354 develop(bool, TraceGCTaskManager, false, \ 2355 "Trace actions of the GC task manager") \ 2356 \ 2357 develop(bool, TraceGCTaskQueue, false, \ 2358 "Trace actions of the GC task queues") \ 2359 \ 2360 develop(bool, TraceGCTaskThread, false, \ 2361 "Trace actions of the GC task threads") \ 2362 \ 2363 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2364 "Print the time taken by each parallel old gc phase." \ 2365 "PrintGCDetails must also be enabled.") \ 2366 \ 2367 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2368 "Trace parallel old gc marking phase") \ 2369 \ 2370 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2371 "Trace parallel old gc summary phase") \ 2372 \ 2373 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2374 "Trace parallel old gc compaction phase") \ 2375 \ 2376 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2377 "Trace parallel old gc dense prefix computation") \ 2378 \ 2379 develop(bool, IgnoreLibthreadGPFault, false, \ 2380 "Suppress workaround for libthread GP fault") \ 2381 \ 2382 product(bool, PrintJNIGCStalls, false, \ 2383 "Print diagnostic message when GC is stalled" \ 2384 "by JNI critical section") \ 2385 \ 2386 /* GC log rotation setting */ \ 2387 \ 2388 product(bool, UseGCLogFileRotation, false, \ 2389 "Prevent large gclog file for long running app. " \ 2390 "Requires -Xloggc:<filename>") \ 2391 \ 2392 product(uintx, NumberOfGCLogFiles, 0, \ 2393 "Number of gclog files in rotation, " \ 2394 "Default: 0, no rotation") \ 2395 \ 2396 product(uintx, GCLogFileSize, 0, \ 2397 "GC log file size, Default: 0 bytes, no rotation " \ 2398 "Only valid with UseGCLogFileRotation") \ 2399 \ 2400 /* JVMTI heap profiling */ \ 2401 \ 2402 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2403 "Trace JVMTI object tagging calls") \ 2404 \ 2405 diagnostic(bool, VerifyBeforeIteration, false, \ 2406 "Verify memory system before JVMTI iteration") \ 2407 \ 2408 /* compiler interface */ \ 2409 \ 2410 develop(bool, CIPrintCompilerName, false, \ 2411 "when CIPrint is active, print the name of the active compiler") \ 2412 \ 2413 develop(bool, CIPrintCompileQueue, false, \ 2414 "display the contents of the compile queue whenever a " \ 2415 "compilation is enqueued") \ 2416 \ 2417 develop(bool, CIPrintRequests, false, \ 2418 "display every request for compilation") \ 2419 \ 2420 product(bool, CITime, false, \ 2421 "collect timing information for compilation") \ 2422 \ 2423 develop(bool, CITimeEach, false, \ 2424 "display timing information after each successful compilation") \ 2425 \ 2426 develop(bool, CICountOSR, true, \ 2427 "use a separate counter when assigning ids to osr compilations") \ 2428 \ 2429 develop(bool, CICompileNatives, true, \ 2430 "compile native methods if supported by the compiler") \ 2431 \ 2432 develop_pd(bool, CICompileOSR, \ 2433 "compile on stack replacement methods if supported by the " \ 2434 "compiler") \ 2435 \ 2436 develop(bool, CIPrintMethodCodes, false, \ 2437 "print method bytecodes of the compiled code") \ 2438 \ 2439 develop(bool, CIPrintTypeFlow, false, \ 2440 "print the results of ciTypeFlow analysis") \ 2441 \ 2442 develop(bool, CITraceTypeFlow, false, \ 2443 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2444 \ 2445 develop(intx, CICloneLoopTestLimit, 100, \ 2446 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2447 \ 2448 develop(intx, OSROnlyBCI, -1, \ 2449 "OSR only at this bci. Negative values mean exclude that bci") \ 2450 \ 2451 /* temp diagnostics */ \ 2452 \ 2453 diagnostic(bool, TraceRedundantCompiles, false, \ 2454 "Have compile broker print when a request already in the queue is"\ 2455 " requested again") \ 2456 \ 2457 diagnostic(bool, InitialCompileFast, false, \ 2458 "Initial compile at CompLevel_fast_compile") \ 2459 \ 2460 diagnostic(bool, InitialCompileReallyFast, false, \ 2461 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2462 \ 2463 diagnostic(bool, FullProfileOnReInterpret, true, \ 2464 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2465 \ 2466 /* compiler */ \ 2467 \ 2468 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2469 "Number of compiler threads to run") \ 2470 \ 2471 product(intx, CompilationPolicyChoice, 0, \ 2472 "which compilation policy (0/1)") \ 2473 \ 2474 develop(bool, UseStackBanging, true, \ 2475 "use stack banging for stack overflow checks (required for " \ 2476 "proper StackOverflow handling; disable only to measure cost " \ 2477 "of stackbanging)") \ 2478 \ 2479 develop(bool, Use24BitFPMode, true, \ 2480 "Set 24-bit FPU mode on a per-compile basis ") \ 2481 \ 2482 develop(bool, Use24BitFP, true, \ 2483 "use FP instructions that produce 24-bit precise results") \ 2484 \ 2485 develop(bool, UseStrictFP, true, \ 2486 "use strict fp if modifier strictfp is set") \ 2487 \ 2488 develop(bool, GenerateSynchronizationCode, true, \ 2489 "generate locking/unlocking code for synchronized methods and " \ 2490 "monitors") \ 2491 \ 2492 develop(bool, GenerateCompilerNullChecks, true, \ 2493 "Generate explicit null checks for loads/stores/calls") \ 2494 \ 2495 develop(bool, GenerateRangeChecks, true, \ 2496 "Generate range checks for array accesses") \ 2497 \ 2498 develop_pd(bool, ImplicitNullChecks, \ 2499 "generate code for implicit null checks") \ 2500 \ 2501 product(bool, PrintSafepointStatistics, false, \ 2502 "print statistics about safepoint synchronization") \ 2503 \ 2504 product(intx, PrintSafepointStatisticsCount, 300, \ 2505 "total number of safepoint statistics collected " \ 2506 "before printing them out") \ 2507 \ 2508 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2509 "print safepoint statistics only when safepoint takes" \ 2510 " more than PrintSafepointSatisticsTimeout in millis") \ 2511 \ 2512 product(bool, TraceSafepointCleanupTime, false, \ 2513 "print the break down of clean up tasks performed during" \ 2514 " safepoint") \ 2515 \ 2516 develop(bool, InlineAccessors, true, \ 2517 "inline accessor methods (get/set)") \ 2518 \ 2519 product(bool, Inline, true, \ 2520 "enable inlining") \ 2521 \ 2522 product(bool, ClipInlining, true, \ 2523 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2524 \ 2525 develop(bool, UseCHA, true, \ 2526 "enable CHA") \ 2527 \ 2528 product(bool, UseTypeProfile, true, \ 2529 "Check interpreter profile for historically monomorphic calls") \ 2530 \ 2531 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2532 "% of major receiver type to all profiled receivers") \ 2533 \ 2534 notproduct(bool, TimeCompiler, false, \ 2535 "time the compiler") \ 2536 \ 2537 notproduct(bool, TimeCompiler2, false, \ 2538 "detailed time the compiler (requires +TimeCompiler)") \ 2539 \ 2540 diagnostic(bool, PrintInlining, false, \ 2541 "prints inlining optimizations") \ 2542 \ 2543 diagnostic(bool, PrintIntrinsics, false, \ 2544 "prints attempted and successful inlining of intrinsics") \ 2545 \ 2546 product(bool, UseCountLeadingZerosInstruction, false, \ 2547 "Use count leading zeros instruction") \ 2548 \ 2549 product(bool, UsePopCountInstruction, false, \ 2550 "Use population count instruction") \ 2551 \ 2552 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2553 "do not expand intrinsics whose (internal) names appear here") \ 2554 \ 2555 develop(bool, StressReflectiveCode, false, \ 2556 "Use inexact types at allocations, etc., to test reflection") \ 2557 \ 2558 develop(bool, EagerInitialization, false, \ 2559 "Eagerly initialize classes if possible") \ 2560 \ 2561 develop(bool, TraceMethodReplacement, false, \ 2562 "Print when methods are replaced do to recompilation") \ 2563 \ 2564 develop(bool, PrintMethodFlushing, false, \ 2565 "print the nmethods being flushed") \ 2566 \ 2567 notproduct(bool, LogMultipleMutexLocking, false, \ 2568 "log locking and unlocking of mutexes (only if multiple locks " \ 2569 "are held)") \ 2570 \ 2571 develop(bool, UseRelocIndex, false, \ 2572 "use an index to speed random access to relocations") \ 2573 \ 2574 develop(bool, StressCodeBuffers, false, \ 2575 "Exercise code buffer expansion and other rare state changes") \ 2576 \ 2577 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2578 "Generate extra debugging info for non-safepoints in nmethods") \ 2579 \ 2580 diagnostic(bool, DebugInlinedCalls, true, \ 2581 "If false, restricts profiled locations to the root method only") \ 2582 \ 2583 product(bool, PrintVMOptions, trueInDebug, \ 2584 "Print flags that appeared on the command line") \ 2585 \ 2586 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2587 "Ignore unrecognized VM options") \ 2588 \ 2589 product(bool, PrintCommandLineFlags, false, \ 2590 "Print flags specified on command line or set by ergonomics") \ 2591 \ 2592 product(bool, PrintFlagsInitial, false, \ 2593 "Print all VM flags before argument processing and exit VM") \ 2594 \ 2595 product(bool, PrintFlagsFinal, false, \ 2596 "Print all VM flags after argument and ergonomic processing") \ 2597 \ 2598 notproduct(bool, PrintFlagsWithComments, false, \ 2599 "Print all VM flags with default values and descriptions and exit")\ 2600 \ 2601 diagnostic(bool, SerializeVMOutput, true, \ 2602 "Use a mutex to serialize output to tty and hotspot.log") \ 2603 \ 2604 diagnostic(bool, DisplayVMOutput, true, \ 2605 "Display all VM output on the tty, independently of LogVMOutput") \ 2606 \ 2607 diagnostic(bool, LogVMOutput, trueInDebug, \ 2608 "Save VM output to hotspot.log, or to LogFile") \ 2609 \ 2610 diagnostic(ccstr, LogFile, NULL, \ 2611 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2612 \ 2613 product(ccstr, ErrorFile, NULL, \ 2614 "If an error occurs, save the error data to this file " \ 2615 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2616 \ 2617 product(bool, DisplayVMOutputToStderr, false, \ 2618 "If DisplayVMOutput is true, display all VM output to stderr") \ 2619 \ 2620 product(bool, DisplayVMOutputToStdout, false, \ 2621 "If DisplayVMOutput is true, display all VM output to stdout") \ 2622 \ 2623 product(bool, UseHeavyMonitors, false, \ 2624 "use heavyweight instead of lightweight Java monitors") \ 2625 \ 2626 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2627 "print histogram of the symbol table") \ 2628 \ 2629 notproduct(bool, ExitVMOnVerifyError, false, \ 2630 "standard exit from VM if bytecode verify error " \ 2631 "(only in debug mode)") \ 2632 \ 2633 notproduct(ccstr, AbortVMOnException, NULL, \ 2634 "Call fatal if this exception is thrown. Example: " \ 2635 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2636 \ 2637 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2638 "Call fatal if the exception pointed by AbortVMOnException " \ 2639 "has this message.") \ 2640 \ 2641 develop(bool, DebugVtables, false, \ 2642 "add debugging code to vtable dispatch") \ 2643 \ 2644 develop(bool, PrintVtables, false, \ 2645 "print vtables when printing klass") \ 2646 \ 2647 notproduct(bool, PrintVtableStats, false, \ 2648 "print vtables stats at end of run") \ 2649 \ 2650 develop(bool, TraceCreateZombies, false, \ 2651 "trace creation of zombie nmethods") \ 2652 \ 2653 notproduct(bool, IgnoreLockingAssertions, false, \ 2654 "disable locking assertions (for speed)") \ 2655 \ 2656 notproduct(bool, VerifyLoopOptimizations, false, \ 2657 "verify major loop optimizations") \ 2658 \ 2659 product(bool, RangeCheckElimination, true, \ 2660 "Split loop iterations to eliminate range checks") \ 2661 \ 2662 develop_pd(bool, UncommonNullCast, \ 2663 "track occurrences of null in casts; adjust compiler tactics") \ 2664 \ 2665 develop(bool, TypeProfileCasts, true, \ 2666 "treat casts like calls for purposes of type profiling") \ 2667 \ 2668 develop(bool, MonomorphicArrayCheck, true, \ 2669 "Uncommon-trap array store checks that require full type check") \ 2670 \ 2671 diagnostic(bool, ProfileDynamicTypes, true, \ 2672 "do extra type profiling and use it more aggressively") \ 2673 \ 2674 develop(bool, DelayCompilationDuringStartup, true, \ 2675 "Delay invoking the compiler until main application class is " \ 2676 "loaded") \ 2677 \ 2678 develop(bool, CompileTheWorld, false, \ 2679 "Compile all methods in all classes in bootstrap class path " \ 2680 "(stress test)") \ 2681 \ 2682 develop(bool, CompileTheWorldPreloadClasses, true, \ 2683 "Preload all classes used by a class before start loading") \ 2684 \ 2685 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2686 "Force a safepoint every n compiles so sweeper can keep up") \ 2687 \ 2688 develop(bool, TraceIterativeGVN, false, \ 2689 "Print progress during Iterative Global Value Numbering") \ 2690 \ 2691 develop(bool, FillDelaySlots, true, \ 2692 "Fill delay slots (on SPARC only)") \ 2693 \ 2694 develop(bool, VerifyIterativeGVN, false, \ 2695 "Verify Def-Use modifications during sparse Iterative Global " \ 2696 "Value Numbering") \ 2697 \ 2698 notproduct(bool, TracePhaseCCP, false, \ 2699 "Print progress during Conditional Constant Propagation") \ 2700 \ 2701 develop(bool, TimeLivenessAnalysis, false, \ 2702 "Time computation of bytecode liveness analysis") \ 2703 \ 2704 develop(bool, TraceLivenessGen, false, \ 2705 "Trace the generation of liveness analysis information") \ 2706 \ 2707 notproduct(bool, TraceLivenessQuery, false, \ 2708 "Trace queries of liveness analysis information") \ 2709 \ 2710 notproduct(bool, CollectIndexSetStatistics, false, \ 2711 "Collect information about IndexSets") \ 2712 \ 2713 develop(bool, PrintDominators, false, \ 2714 "Print out dominator trees for GVN") \ 2715 \ 2716 develop(bool, UseLoopSafepoints, true, \ 2717 "Generate Safepoint nodes in every loop") \ 2718 \ 2719 notproduct(bool, TraceCISCSpill, false, \ 2720 "Trace allocators use of cisc spillable instructions") \ 2721 \ 2722 notproduct(bool, TraceSpilling, false, \ 2723 "Trace spilling") \ 2724 \ 2725 product(bool, SplitIfBlocks, true, \ 2726 "Clone compares and control flow through merge points to fold " \ 2727 "some branches") \ 2728 \ 2729 develop(intx, FastAllocateSizeLimit, 128*K, \ 2730 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2731 "Inline allocations larger than this in doublewords must go slow")\ 2732 \ 2733 product(bool, AggressiveOpts, false, \ 2734 "Enable aggressive optimizations - see arguments.cpp") \ 2735 \ 2736 product(bool, UseStringCache, false, \ 2737 "Enable String cache capabilities on String.java") \ 2738 \ 2739 /* statistics */ \ 2740 develop(bool, CountCompiledCalls, false, \ 2741 "counts method invocations") \ 2742 \ 2743 notproduct(bool, CountRuntimeCalls, false, \ 2744 "counts VM runtime calls") \ 2745 \ 2746 develop(bool, CountJNICalls, false, \ 2747 "counts jni method invocations") \ 2748 \ 2749 notproduct(bool, CountJVMCalls, false, \ 2750 "counts jvm method invocations") \ 2751 \ 2752 notproduct(bool, CountRemovableExceptions, false, \ 2753 "count exceptions that could be replaced by branches due to " \ 2754 "inlining") \ 2755 \ 2756 notproduct(bool, ICMissHistogram, false, \ 2757 "produce histogram of IC misses") \ 2758 \ 2759 notproduct(bool, PrintClassStatistics, false, \ 2760 "prints class statistics at end of run") \ 2761 \ 2762 notproduct(bool, PrintMethodStatistics, false, \ 2763 "prints method statistics at end of run") \ 2764 \ 2765 /* interpreter */ \ 2766 develop(bool, ClearInterpreterLocals, false, \ 2767 "Always clear local variables of interpreter activations upon " \ 2768 "entry") \ 2769 \ 2770 product_pd(bool, RewriteBytecodes, \ 2771 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2772 \ 2773 product_pd(bool, RewriteFrequentPairs, \ 2774 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2775 \ 2776 diagnostic(bool, PrintInterpreter, false, \ 2777 "Prints the generated interpreter code") \ 2778 \ 2779 product(bool, UseInterpreter, true, \ 2780 "Use interpreter for non-compiled methods") \ 2781 \ 2782 develop(bool, UseFastSignatureHandlers, true, \ 2783 "Use fast signature handlers for native calls") \ 2784 \ 2785 develop(bool, UseV8InstrsOnly, false, \ 2786 "Use SPARC-V8 Compliant instruction subset") \ 2787 \ 2788 product(bool, UseNiagaraInstrs, false, \ 2789 "Use Niagara-efficient instruction subset") \ 2790 \ 2791 develop(bool, UseCASForSwap, false, \ 2792 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2793 \ 2794 product(bool, UseLoopCounter, true, \ 2795 "Increment invocation counter on backward branch") \ 2796 \ 2797 product(bool, UseFastEmptyMethods, true, \ 2798 "Use fast method entry code for empty methods") \ 2799 \ 2800 product(bool, UseFastAccessorMethods, true, \ 2801 "Use fast method entry code for accessor methods") \ 2802 \ 2803 product_pd(bool, UseOnStackReplacement, \ 2804 "Use on stack replacement, calls runtime if invoc. counter " \ 2805 "overflows in loop") \ 2806 \ 2807 notproduct(bool, TraceOnStackReplacement, false, \ 2808 "Trace on stack replacement") \ 2809 \ 2810 develop(bool, PoisonOSREntry, true, \ 2811 "Detect abnormal calls to OSR code") \ 2812 \ 2813 product_pd(bool, PreferInterpreterNativeStubs, \ 2814 "Use always interpreter stubs for native methods invoked via " \ 2815 "interpreter") \ 2816 \ 2817 develop(bool, CountBytecodes, false, \ 2818 "Count number of bytecodes executed") \ 2819 \ 2820 develop(bool, PrintBytecodeHistogram, false, \ 2821 "Print histogram of the executed bytecodes") \ 2822 \ 2823 develop(bool, PrintBytecodePairHistogram, false, \ 2824 "Print histogram of the executed bytecode pairs") \ 2825 \ 2826 diagnostic(bool, PrintSignatureHandlers, false, \ 2827 "Print code generated for native method signature handlers") \ 2828 \ 2829 develop(bool, VerifyOops, false, \ 2830 "Do plausibility checks for oops") \ 2831 \ 2832 develop(bool, CheckUnhandledOops, false, \ 2833 "Check for unhandled oops in VM code") \ 2834 \ 2835 develop(bool, VerifyJNIFields, trueInDebug, \ 2836 "Verify jfieldIDs for instance fields") \ 2837 \ 2838 notproduct(bool, VerifyJNIEnvThread, false, \ 2839 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2840 "from JNI") \ 2841 \ 2842 develop(bool, VerifyFPU, false, \ 2843 "Verify FPU state (check for NaN's, etc.)") \ 2844 \ 2845 develop(bool, VerifyThread, false, \ 2846 "Watch the thread register for corruption (SPARC only)") \ 2847 \ 2848 develop(bool, VerifyActivationFrameSize, false, \ 2849 "Verify that activation frame didn't become smaller than its " \ 2850 "minimal size") \ 2851 \ 2852 develop(bool, TraceFrequencyInlining, false, \ 2853 "Trace frequency based inlining") \ 2854 \ 2855 notproduct(bool, TraceTypeProfile, false, \ 2856 "Trace type profile") \ 2857 \ 2858 develop_pd(bool, InlineIntrinsics, \ 2859 "Inline intrinsics that can be statically resolved") \ 2860 \ 2861 product_pd(bool, ProfileInterpreter, \ 2862 "Profile at the bytecode level during interpretation") \ 2863 \ 2864 develop_pd(bool, ProfileTraps, \ 2865 "Profile deoptimization traps at the bytecode level") \ 2866 \ 2867 product(intx, ProfileMaturityPercentage, 20, \ 2868 "number of method invocations/branches (expressed as % of " \ 2869 "CompileThreshold) before using the method's profile") \ 2870 \ 2871 develop(bool, PrintMethodData, false, \ 2872 "Print the results of +ProfileInterpreter at end of run") \ 2873 \ 2874 develop(bool, VerifyDataPointer, trueInDebug, \ 2875 "Verify the method data pointer during interpreter profiling") \ 2876 \ 2877 develop(bool, VerifyCompiledCode, false, \ 2878 "Include miscellaneous runtime verifications in nmethod code; " \ 2879 "default off because it disturbs nmethod size heuristics") \ 2880 \ 2881 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2882 "Manually make GC thread crash then dump java stack trace; " \ 2883 "Test only") \ 2884 \ 2885 /* compilation */ \ 2886 product(bool, UseCompiler, true, \ 2887 "use compilation") \ 2888 \ 2889 develop(bool, TraceCompilationPolicy, false, \ 2890 "Trace compilation policy") \ 2891 \ 2892 develop(bool, TimeCompilationPolicy, false, \ 2893 "Time the compilation policy") \ 2894 \ 2895 product(bool, UseCounterDecay, true, \ 2896 "adjust recompilation counters") \ 2897 \ 2898 develop(intx, CounterHalfLifeTime, 30, \ 2899 "half-life time of invocation counters (in secs)") \ 2900 \ 2901 develop(intx, CounterDecayMinIntervalLength, 500, \ 2902 "Min. ms. between invocation of CounterDecay") \ 2903 \ 2904 product(bool, AlwaysCompileLoopMethods, false, \ 2905 "when using recompilation, never interpret methods " \ 2906 "containing loops") \ 2907 \ 2908 product(bool, DontCompileHugeMethods, true, \ 2909 "don't compile methods > HugeMethodLimit") \ 2910 \ 2911 /* Bytecode escape analysis estimation. */ \ 2912 product(bool, EstimateArgEscape, true, \ 2913 "Analyze bytecodes to estimate escape state of arguments") \ 2914 \ 2915 product(intx, BCEATraceLevel, 0, \ 2916 "How much tracing to do of bytecode escape analysis estimates") \ 2917 \ 2918 product(intx, MaxBCEAEstimateLevel, 5, \ 2919 "Maximum number of nested calls that are analyzed by BC EA.") \ 2920 \ 2921 product(intx, MaxBCEAEstimateSize, 150, \ 2922 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2923 \ 2924 product(intx, AllocatePrefetchStyle, 1, \ 2925 "0 = no prefetch, " \ 2926 "1 = prefetch instructions for each allocation, " \ 2927 "2 = use TLAB watermark to gate allocation prefetch, " \ 2928 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2929 \ 2930 product(intx, AllocatePrefetchDistance, -1, \ 2931 "Distance to prefetch ahead of allocation pointer") \ 2932 \ 2933 product(intx, AllocatePrefetchLines, 3, \ 2934 "Number of lines to prefetch ahead of array allocation pointer") \ 2935 \ 2936 product(intx, AllocateInstancePrefetchLines, 1, \ 2937 "Number of lines to prefetch ahead of instance allocation pointer") \ 2938 \ 2939 product(intx, AllocatePrefetchStepSize, 16, \ 2940 "Step size in bytes of sequential prefetch instructions") \ 2941 \ 2942 product(intx, AllocatePrefetchInstr, 0, \ 2943 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2944 \ 2945 product(intx, ReadPrefetchInstr, 0, \ 2946 "Prefetch instruction to prefetch ahead") \ 2947 \ 2948 product(uintx, ArraycopySrcPrefetchDistance, 0, \ 2949 "Distance to prefetch source array in arracopy") \ 2950 \ 2951 product(uintx, ArraycopyDstPrefetchDistance, 0, \ 2952 "Distance to prefetch destination array in arracopy") \ 2953 \ 2954 /* deoptimization */ \ 2955 develop(bool, TraceDeoptimization, false, \ 2956 "Trace deoptimization") \ 2957 \ 2958 develop(bool, DebugDeoptimization, false, \ 2959 "Tracing various information while debugging deoptimization") \ 2960 \ 2961 product(intx, SelfDestructTimer, 0, \ 2962 "Will cause VM to terminate after a given time (in minutes) " \ 2963 "(0 means off)") \ 2964 \ 2965 product(intx, MaxJavaStackTraceDepth, 1024, \ 2966 "Max. no. of lines in the stack trace for Java exceptions " \ 2967 "(0 means all)") \ 2968 \ 2969 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2970 "Guarantee a safepoint (at least) every so many milliseconds " \ 2971 "(0 means none)")) \ 2972 \ 2973 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2974 "Guarantee a safepoint (at least) every so many milliseconds " \ 2975 "(0 means none)")) \ 2976 \ 2977 product(intx, SafepointTimeoutDelay, 10000, \ 2978 "Delay in milliseconds for option SafepointTimeout") \ 2979 \ 2980 product(intx, NmethodSweepFraction, 4, \ 2981 "Number of invocations of sweeper to cover all nmethods") \ 2982 \ 2983 product(intx, NmethodSweepCheckInterval, 5, \ 2984 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2985 \ 2986 notproduct(bool, LogSweeper, false, \ 2987 "Keep a ring buffer of sweeper activity") \ 2988 \ 2989 notproduct(intx, SweeperLogEntries, 1024, \ 2990 "Number of records in the ring buffer of sweeper activity") \ 2991 \ 2992 notproduct(intx, MemProfilingInterval, 500, \ 2993 "Time between each invocation of the MemProfiler") \ 2994 \ 2995 develop(intx, MallocCatchPtr, -1, \ 2996 "Hit breakpoint when mallocing/freeing this pointer") \ 2997 \ 2998 notproduct(intx, AssertRepeat, 1, \ 2999 "number of times to evaluate expression in assert " \ 3000 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3001 \ 3002 notproduct(ccstrlist, SuppressErrorAt, "", \ 3003 "List of assertions (file:line) to muzzle") \ 3004 \ 3005 notproduct(uintx, HandleAllocationLimit, 1024, \ 3006 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3007 "is used") \ 3008 \ 3009 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3010 "Threshold for total handle allocation when " \ 3011 "+TraceHandleAllocation is used") \ 3012 \ 3013 develop(intx, StackPrintLimit, 100, \ 3014 "number of stack frames to print in VM-level stack dump") \ 3015 \ 3016 notproduct(intx, MaxElementPrintSize, 256, \ 3017 "maximum number of elements to print") \ 3018 \ 3019 notproduct(intx, MaxSubklassPrintSize, 4, \ 3020 "maximum number of subklasses to print when printing klass") \ 3021 \ 3022 product(intx, MaxInlineLevel, 9, \ 3023 "maximum number of nested calls that are inlined") \ 3024 \ 3025 product(intx, MaxRecursiveInlineLevel, 1, \ 3026 "maximum number of nested recursive calls that are inlined") \ 3027 \ 3028 product_pd(intx, InlineSmallCode, \ 3029 "Only inline already compiled methods if their code size is " \ 3030 "less than this") \ 3031 \ 3032 product(intx, MaxInlineSize, 35, \ 3033 "maximum bytecode size of a method to be inlined") \ 3034 \ 3035 product_pd(intx, FreqInlineSize, \ 3036 "maximum bytecode size of a frequent method to be inlined") \ 3037 \ 3038 product(intx, MaxTrivialSize, 6, \ 3039 "maximum bytecode size of a trivial method to be inlined") \ 3040 \ 3041 product(intx, MinInliningThreshold, 250, \ 3042 "min. invocation count a method needs to have to be inlined") \ 3043 \ 3044 develop(intx, AlignEntryCode, 4, \ 3045 "aligns entry code to specified value (in bytes)") \ 3046 \ 3047 develop(intx, MethodHistogramCutoff, 100, \ 3048 "cutoff value for method invoc. histogram (+CountCalls)") \ 3049 \ 3050 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3051 "# of interpreted methods to show in profile") \ 3052 \ 3053 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3054 "# of compiled methods to show in profile") \ 3055 \ 3056 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3057 "# of stub methods to show in profile") \ 3058 \ 3059 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3060 "# of runtime stub nodes to show in profile") \ 3061 \ 3062 product(intx, ProfileIntervalsTicks, 100, \ 3063 "# of ticks between printing of interval profile " \ 3064 "(+ProfileIntervals)") \ 3065 \ 3066 notproduct(intx, ScavengeALotInterval, 1, \ 3067 "Interval between which scavenge will occur with +ScavengeALot") \ 3068 \ 3069 notproduct(intx, FullGCALotInterval, 1, \ 3070 "Interval between which full gc will occur with +FullGCALot") \ 3071 \ 3072 notproduct(intx, FullGCALotStart, 0, \ 3073 "For which invocation to start FullGCAlot") \ 3074 \ 3075 notproduct(intx, FullGCALotDummies, 32*K, \ 3076 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3077 "to move") \ 3078 \ 3079 develop(intx, DontYieldALotInterval, 10, \ 3080 "Interval between which yields will be dropped (milliseconds)") \ 3081 \ 3082 develop(intx, MinSleepInterval, 1, \ 3083 "Minimum sleep() interval (milliseconds) when " \ 3084 "ConvertSleepToYield is off (used for SOLARIS)") \ 3085 \ 3086 product(intx, EventLogLength, 2000, \ 3087 "maximum nof events in event log") \ 3088 \ 3089 develop(intx, ProfilerPCTickThreshold, 15, \ 3090 "Number of ticks in a PC buckets to be a hotspot") \ 3091 \ 3092 notproduct(intx, DeoptimizeALotInterval, 5, \ 3093 "Number of exits until DeoptimizeALot kicks in") \ 3094 \ 3095 notproduct(intx, ZombieALotInterval, 5, \ 3096 "Number of exits until ZombieALot kicks in") \ 3097 \ 3098 develop(bool, StressNonEntrant, false, \ 3099 "Mark nmethods non-entrant at registration") \ 3100 \ 3101 diagnostic(intx, MallocVerifyInterval, 0, \ 3102 "if non-zero, verify C heap after every N calls to " \ 3103 "malloc/realloc/free") \ 3104 \ 3105 diagnostic(intx, MallocVerifyStart, 0, \ 3106 "if non-zero, start verifying C heap after Nth call to " \ 3107 "malloc/realloc/free") \ 3108 \ 3109 product(intx, TypeProfileWidth, 2, \ 3110 "number of receiver types to record in call/cast profile") \ 3111 \ 3112 develop(intx, BciProfileWidth, 2, \ 3113 "number of return bci's to record in ret profile") \ 3114 \ 3115 product(intx, PerMethodRecompilationCutoff, 400, \ 3116 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3117 \ 3118 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3119 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3120 \ 3121 product(intx, PerMethodTrapLimit, 100, \ 3122 "Limit on traps (of one kind) in a method (includes inlines)") \ 3123 \ 3124 product(intx, PerBytecodeTrapLimit, 4, \ 3125 "Limit on traps (of one kind) at a particular BCI") \ 3126 \ 3127 develop(intx, FreqCountInvocations, 1, \ 3128 "Scaling factor for branch frequencies (deprecated)") \ 3129 \ 3130 develop(intx, InlineFrequencyRatio, 20, \ 3131 "Ratio of call site execution to caller method invocation") \ 3132 \ 3133 develop_pd(intx, InlineFrequencyCount, \ 3134 "Count of call site execution necessary to trigger frequent " \ 3135 "inlining") \ 3136 \ 3137 develop(intx, InlineThrowCount, 50, \ 3138 "Force inlining of interpreted methods that throw this often") \ 3139 \ 3140 develop(intx, InlineThrowMaxSize, 200, \ 3141 "Force inlining of throwing methods smaller than this") \ 3142 \ 3143 product(intx, AliasLevel, 3, \ 3144 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3145 "2 for class split, 3 for unique instances") \ 3146 \ 3147 develop(bool, VerifyAliases, false, \ 3148 "perform extra checks on the results of alias analysis") \ 3149 \ 3150 develop(intx, ProfilerNodeSize, 1024, \ 3151 "Size in K to allocate for the Profile Nodes of each thread") \ 3152 \ 3153 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3154 "Number of times to spin wait on a v8 atomic operation lock") \ 3155 \ 3156 product(intx, ReadSpinIterations, 100, \ 3157 "Number of read attempts before a yield (spin inner loop)") \ 3158 \ 3159 product_pd(intx, PreInflateSpin, \ 3160 "Number of times to spin wait before inflation") \ 3161 \ 3162 product(intx, PreBlockSpin, 10, \ 3163 "Number of times to spin in an inflated lock before going to " \ 3164 "an OS lock") \ 3165 \ 3166 /* gc parameters */ \ 3167 product(uintx, InitialHeapSize, 0, \ 3168 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3169 \ 3170 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3171 "Maximum heap size (in bytes)") \ 3172 \ 3173 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3174 "Initial tenured generation size (in bytes)") \ 3175 \ 3176 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3177 "Initial new generation size (in bytes)") \ 3178 \ 3179 product(uintx, MaxNewSize, max_uintx, \ 3180 "Maximum new generation size (in bytes), max_uintx means set " \ 3181 "ergonomically") \ 3182 \ 3183 product(uintx, PretenureSizeThreshold, 0, \ 3184 "Maximum size in bytes of objects allocated in DefNew " \ 3185 "generation; zero means no maximum") \ 3186 \ 3187 product(uintx, TLABSize, 0, \ 3188 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3189 \ 3190 product(uintx, MinTLABSize, 2*K, \ 3191 "Minimum allowed TLAB size (in bytes)") \ 3192 \ 3193 product(uintx, TLABAllocationWeight, 35, \ 3194 "Allocation averaging weight") \ 3195 \ 3196 product(uintx, TLABWasteTargetPercent, 1, \ 3197 "Percentage of Eden that can be wasted") \ 3198 \ 3199 product(uintx, TLABRefillWasteFraction, 64, \ 3200 "Max TLAB waste at a refill (internal fragmentation)") \ 3201 \ 3202 product(uintx, TLABWasteIncrement, 4, \ 3203 "Increment allowed waste at slow allocation") \ 3204 \ 3205 product(intx, SurvivorRatio, 8, \ 3206 "Ratio of eden/survivor space size") \ 3207 \ 3208 product(intx, NewRatio, 2, \ 3209 "Ratio of new/old generation sizes") \ 3210 \ 3211 product_pd(uintx, NewSizeThreadIncrease, \ 3212 "Additional size added to desired new generation size per " \ 3213 "non-daemon thread (in bytes)") \ 3214 \ 3215 product_pd(uintx, PermSize, \ 3216 "Initial size of permanent generation (in bytes)") \ 3217 \ 3218 product_pd(uintx, MaxPermSize, \ 3219 "Maximum size of permanent generation (in bytes)") \ 3220 \ 3221 product(uintx, MinHeapFreeRatio, 40, \ 3222 "Min percentage of heap free after GC to avoid expansion") \ 3223 \ 3224 product(uintx, MaxHeapFreeRatio, 70, \ 3225 "Max percentage of heap free after GC to avoid shrinking") \ 3226 \ 3227 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3228 "Number of milliseconds per MB of free space in the heap") \ 3229 \ 3230 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3231 "Min change in heap space due to GC (in bytes)") \ 3232 \ 3233 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3234 "Min expansion of permanent heap (in bytes)") \ 3235 \ 3236 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3237 "Max expansion of permanent heap without full GC (in bytes)") \ 3238 \ 3239 product(intx, QueuedAllocationWarningCount, 0, \ 3240 "Number of times an allocation that queues behind a GC " \ 3241 "will retry before printing a warning") \ 3242 \ 3243 diagnostic(uintx, VerifyGCStartAt, 0, \ 3244 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3245 \ 3246 diagnostic(intx, VerifyGCLevel, 0, \ 3247 "Generation level at which to start +VerifyBefore/AfterGC") \ 3248 \ 3249 develop(uintx, ExitAfterGCNum, 0, \ 3250 "If non-zero, exit after this GC.") \ 3251 \ 3252 product(intx, MaxTenuringThreshold, 15, \ 3253 "Maximum value for tenuring threshold") \ 3254 \ 3255 product(intx, InitialTenuringThreshold, 7, \ 3256 "Initial value for tenuring threshold") \ 3257 \ 3258 product(intx, TargetSurvivorRatio, 50, \ 3259 "Desired percentage of survivor space used after scavenge") \ 3260 \ 3261 product(uintx, MarkSweepDeadRatio, 5, \ 3262 "Percentage (0-100) of the old gen allowed as dead wood." \ 3263 "Serial mark sweep treats this as both the min and max value." \ 3264 "CMS uses this value only if it falls back to mark sweep." \ 3265 "Par compact uses a variable scale based on the density of the" \ 3266 "generation and treats this as the max value when the heap is" \ 3267 "either completely full or completely empty. Par compact also" \ 3268 "has a smaller default value; see arguments.cpp.") \ 3269 \ 3270 product(uintx, PermMarkSweepDeadRatio, 20, \ 3271 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3272 "See MarkSweepDeadRatio for collector-specific comments.") \ 3273 \ 3274 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3275 "How often should we fully compact the heap (ignoring the dead " \ 3276 "space parameters)") \ 3277 \ 3278 product(intx, PrintCMSStatistics, 0, \ 3279 "Statistics for CMS") \ 3280 \ 3281 product(bool, PrintCMSInitiationStatistics, false, \ 3282 "Statistics for initiating a CMS collection") \ 3283 \ 3284 product(intx, PrintFLSStatistics, 0, \ 3285 "Statistics for CMS' FreeListSpace") \ 3286 \ 3287 product(intx, PrintFLSCensus, 0, \ 3288 "Census for CMS' FreeListSpace") \ 3289 \ 3290 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3291 "Delay in ms between expansion and allocation") \ 3292 \ 3293 product(intx, DeferThrSuspendLoopCount, 4000, \ 3294 "(Unstable) Number of times to iterate in safepoint loop " \ 3295 " before blocking VM threads ") \ 3296 \ 3297 product(intx, DeferPollingPageLoopCount, -1, \ 3298 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3299 "before changing safepoint polling page to RO ") \ 3300 \ 3301 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3302 \ 3303 product(bool, PSChunkLargeArrays, true, \ 3304 "true: process large arrays in chunks") \ 3305 \ 3306 product(uintx, GCDrainStackTargetSize, 64, \ 3307 "how many entries we'll try to leave on the stack during " \ 3308 "parallel GC") \ 3309 \ 3310 /* stack parameters */ \ 3311 product_pd(intx, StackYellowPages, \ 3312 "Number of yellow zone (recoverable overflows) pages") \ 3313 \ 3314 product_pd(intx, StackRedPages, \ 3315 "Number of red zone (unrecoverable overflows) pages") \ 3316 \ 3317 product_pd(intx, StackShadowPages, \ 3318 "Number of shadow zone (for overflow checking) pages" \ 3319 " this should exceed the depth of the VM and native call stack") \ 3320 \ 3321 product_pd(intx, ThreadStackSize, \ 3322 "Thread Stack Size (in Kbytes)") \ 3323 \ 3324 product_pd(intx, VMThreadStackSize, \ 3325 "Non-Java Thread Stack Size (in Kbytes)") \ 3326 \ 3327 product_pd(intx, CompilerThreadStackSize, \ 3328 "Compiler Thread Stack Size (in Kbytes)") \ 3329 \ 3330 develop_pd(uintx, JVMInvokeMethodSlack, \ 3331 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3332 \ 3333 product(uintx, ThreadSafetyMargin, 50*M, \ 3334 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3335 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3336 "disable this feature") \ 3337 \ 3338 /* code cache parameters */ \ 3339 develop(uintx, CodeCacheSegmentSize, 64, \ 3340 "Code cache segment size (in bytes) - smallest unit of " \ 3341 "allocation") \ 3342 \ 3343 develop_pd(intx, CodeEntryAlignment, \ 3344 "Code entry alignment for generated code (in bytes)") \ 3345 \ 3346 product_pd(intx, OptoLoopAlignment, \ 3347 "Align inner loops to zero relative to this modulus") \ 3348 \ 3349 product_pd(uintx, InitialCodeCacheSize, \ 3350 "Initial code cache size (in bytes)") \ 3351 \ 3352 product_pd(uintx, ReservedCodeCacheSize, \ 3353 "Reserved code cache size (in bytes) - maximum code cache size") \ 3354 \ 3355 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3356 "When less than X space left, we stop compiling.") \ 3357 \ 3358 product_pd(uintx, CodeCacheExpansionSize, \ 3359 "Code cache expansion size (in bytes)") \ 3360 \ 3361 develop_pd(uintx, CodeCacheMinBlockLength, \ 3362 "Minimum number of segments in a code cache block.") \ 3363 \ 3364 notproduct(bool, ExitOnFullCodeCache, false, \ 3365 "Exit the VM if we fill the code cache.") \ 3366 \ 3367 product(bool, UseCodeCacheFlushing, false, \ 3368 "Attempt to clean the code cache before shutting off compiler") \ 3369 \ 3370 product(intx, MinCodeCacheFlushingInterval, 30, \ 3371 "Min number of seconds between code cache cleaning sessions") \ 3372 \ 3373 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3374 "When less than X space left, start code cache cleaning") \ 3375 \ 3376 /* interpreter debugging */ \ 3377 develop(intx, BinarySwitchThreshold, 5, \ 3378 "Minimal number of lookupswitch entries for rewriting to binary " \ 3379 "switch") \ 3380 \ 3381 develop(intx, StopInterpreterAt, 0, \ 3382 "Stops interpreter execution at specified bytecode number") \ 3383 \ 3384 develop(intx, TraceBytecodesAt, 0, \ 3385 "Traces bytecodes starting with specified bytecode number") \ 3386 \ 3387 /* compiler interface */ \ 3388 develop(intx, CIStart, 0, \ 3389 "the id of the first compilation to permit") \ 3390 \ 3391 develop(intx, CIStop, -1, \ 3392 "the id of the last compilation to permit") \ 3393 \ 3394 develop(intx, CIStartOSR, 0, \ 3395 "the id of the first osr compilation to permit " \ 3396 "(CICountOSR must be on)") \ 3397 \ 3398 develop(intx, CIStopOSR, -1, \ 3399 "the id of the last osr compilation to permit " \ 3400 "(CICountOSR must be on)") \ 3401 \ 3402 develop(intx, CIBreakAtOSR, -1, \ 3403 "id of osr compilation to break at") \ 3404 \ 3405 develop(intx, CIBreakAt, -1, \ 3406 "id of compilation to break at") \ 3407 \ 3408 product(ccstrlist, CompileOnly, "", \ 3409 "List of methods (pkg/class.name) to restrict compilation to") \ 3410 \ 3411 product(ccstr, CompileCommandFile, NULL, \ 3412 "Read compiler commands from this file [.hotspot_compiler]") \ 3413 \ 3414 product(ccstrlist, CompileCommand, "", \ 3415 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3416 \ 3417 product(bool, CICompilerCountPerCPU, false, \ 3418 "1 compiler thread for log(N CPUs)") \ 3419 \ 3420 develop(intx, CIFireOOMAt, -1, \ 3421 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3422 "(non-negative value throws OOM after this many CI accesses " \ 3423 "in each compile)") \ 3424 \ 3425 develop(intx, CIFireOOMAtDelay, -1, \ 3426 "Wait for this many CI accesses to occur in all compiles before " \ 3427 "beginning to throw OutOfMemoryErrors in each compile") \ 3428 \ 3429 notproduct(bool, CIObjectFactoryVerify, false, \ 3430 "enable potentially expensive verification in ciObjectFactory") \ 3431 \ 3432 /* Priorities */ \ 3433 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3434 \ 3435 product(intx, ThreadPriorityPolicy, 0, \ 3436 "0 : Normal. "\ 3437 " VM chooses priorities that are appropriate for normal "\ 3438 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3439 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3440 " map to lower native priority values. On Windows applications"\ 3441 " are allowed to use higher native priorities. However, with "\ 3442 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3443 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3444 " interfere with system threads. On Linux thread priorities "\ 3445 " are ignored because the OS does not support static priority "\ 3446 " in SCHED_OTHER scheduling class which is the only choice for"\ 3447 " non-root, non-realtime applications. "\ 3448 "1 : Aggressive. "\ 3449 " Java thread priorities map over to the entire range of "\ 3450 " native thread priorities. Higher Java thread priorities map "\ 3451 " to higher native thread priorities. This policy should be "\ 3452 " used with care, as sometimes it can cause performance "\ 3453 " degradation in the application and/or the entire system. On "\ 3454 " Linux this policy requires root privilege.") \ 3455 \ 3456 product(bool, ThreadPriorityVerbose, false, \ 3457 "print priority changes") \ 3458 \ 3459 product(intx, DefaultThreadPriority, -1, \ 3460 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3461 \ 3462 product(intx, CompilerThreadPriority, -1, \ 3463 "what priority should compiler threads run at (-1 means no change)") \ 3464 \ 3465 product(intx, VMThreadPriority, -1, \ 3466 "what priority should VM threads run at (-1 means no change)") \ 3467 \ 3468 product(bool, CompilerThreadHintNoPreempt, true, \ 3469 "(Solaris only) Give compiler threads an extra quanta") \ 3470 \ 3471 product(bool, VMThreadHintNoPreempt, false, \ 3472 "(Solaris only) Give VM thread an extra quanta") \ 3473 \ 3474 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3475 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3476 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3477 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3478 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3479 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3480 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3481 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3482 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3483 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3484 \ 3485 /* compiler debugging */ \ 3486 notproduct(intx, CompileTheWorldStartAt, 1, \ 3487 "First class to consider when using +CompileTheWorld") \ 3488 \ 3489 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3490 "Last class to consider when using +CompileTheWorld") \ 3491 \ 3492 develop(intx, NewCodeParameter, 0, \ 3493 "Testing Only: Create a dedicated integer parameter before " \ 3494 "putback") \ 3495 \ 3496 /* new oopmap storage allocation */ \ 3497 develop(intx, MinOopMapAllocation, 8, \ 3498 "Minimum number of OopMap entries in an OopMapSet") \ 3499 \ 3500 /* Background Compilation */ \ 3501 develop(intx, LongCompileThreshold, 50, \ 3502 "Used with +TraceLongCompiles") \ 3503 \ 3504 product(intx, StarvationMonitorInterval, 200, \ 3505 "Pause between each check in ms") \ 3506 \ 3507 /* recompilation */ \ 3508 product_pd(intx, CompileThreshold, \ 3509 "number of interpreted method invocations before (re-)compiling") \ 3510 \ 3511 product_pd(intx, BackEdgeThreshold, \ 3512 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3513 \ 3514 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3515 "Interpreter (tier 0) invocation notification frequency.") \ 3516 \ 3517 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3518 "C1 without MDO (tier 2) invocation notification frequency.") \ 3519 \ 3520 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3521 "C1 with MDO profiling (tier 3) invocation notification " \ 3522 "frequency.") \ 3523 \ 3524 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3525 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3526 \ 3527 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3528 "Interpreter (tier 0) invocation notification frequency.") \ 3529 \ 3530 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3531 "C1 without MDO (tier 2) invocation notification frequency.") \ 3532 \ 3533 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3534 "C1 with MDO profiling (tier 3) invocation notification " \ 3535 "frequency.") \ 3536 \ 3537 product(intx, Tier2CompileThreshold, 0, \ 3538 "threshold at which tier 2 compilation is invoked") \ 3539 \ 3540 product(intx, Tier2BackEdgeThreshold, 0, \ 3541 "Back edge threshold at which tier 2 compilation is invoked") \ 3542 \ 3543 product(intx, Tier3InvocationThreshold, 200, \ 3544 "Compile if number of method invocations crosses this " \ 3545 "threshold") \ 3546 \ 3547 product(intx, Tier3MinInvocationThreshold, 100, \ 3548 "Minimum invocation to compile at tier 3") \ 3549 \ 3550 product(intx, Tier3CompileThreshold, 2000, \ 3551 "Threshold at which tier 3 compilation is invoked (invocation " \ 3552 "minimum must be satisfied.") \ 3553 \ 3554 product(intx, Tier3BackEdgeThreshold, 7000, \ 3555 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3556 \ 3557 product(intx, Tier4InvocationThreshold, 5000, \ 3558 "Compile if number of method invocations crosses this " \ 3559 "threshold") \ 3560 \ 3561 product(intx, Tier4MinInvocationThreshold, 600, \ 3562 "Minimum invocation to compile at tier 4") \ 3563 \ 3564 product(intx, Tier4CompileThreshold, 15000, \ 3565 "Threshold at which tier 4 compilation is invoked (invocation " \ 3566 "minimum must be satisfied.") \ 3567 \ 3568 product(intx, Tier4BackEdgeThreshold, 40000, \ 3569 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3570 \ 3571 product(intx, Tier3DelayOn, 5, \ 3572 "If C2 queue size grows over this amount per compiler thread " \ 3573 "stop compiling at tier 3 and start compiling at tier 2") \ 3574 \ 3575 product(intx, Tier3DelayOff, 2, \ 3576 "If C2 queue size is less than this amount per compiler thread " \ 3577 "allow methods compiled at tier 2 transition to tier 3") \ 3578 \ 3579 product(intx, Tier3LoadFeedback, 5, \ 3580 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3581 "reaches this amount per compiler thread") \ 3582 \ 3583 product(intx, Tier4LoadFeedback, 3, \ 3584 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3585 "reaches this amount per compiler thread") \ 3586 \ 3587 product(intx, TieredCompileTaskTimeout, 50, \ 3588 "Kill compile task if method was not used within " \ 3589 "given timeout in milliseconds") \ 3590 \ 3591 product(intx, TieredStopAtLevel, 4, \ 3592 "Stop at given compilation level") \ 3593 \ 3594 product(intx, Tier0ProfilingStartPercentage, 200, \ 3595 "Start profiling in interpreter if the counters exceed tier 3" \ 3596 "thresholds by the specified percentage") \ 3597 \ 3598 product(intx, TieredRateUpdateMinTime, 1, \ 3599 "Minimum rate sampling interval (in milliseconds)") \ 3600 \ 3601 product(intx, TieredRateUpdateMaxTime, 25, \ 3602 "Maximum rate sampling interval (in milliseconds)") \ 3603 \ 3604 product_pd(bool, TieredCompilation, \ 3605 "Enable tiered compilation") \ 3606 \ 3607 product(bool, PrintTieredEvents, false, \ 3608 "Print tiered events notifications") \ 3609 \ 3610 product(bool, StressTieredRuntime, false, \ 3611 "Alternate client and server compiler on compile requests") \ 3612 \ 3613 product_pd(intx, OnStackReplacePercentage, \ 3614 "NON_TIERED number of method invocations/branches (expressed as %"\ 3615 "of CompileThreshold) before (re-)compiling OSR code") \ 3616 \ 3617 product(intx, InterpreterProfilePercentage, 33, \ 3618 "NON_TIERED number of method invocations/branches (expressed as %"\ 3619 "of CompileThreshold) before profiling in the interpreter") \ 3620 \ 3621 develop(intx, MaxRecompilationSearchLength, 10, \ 3622 "max. # frames to inspect searching for recompilee") \ 3623 \ 3624 develop(intx, MaxInterpretedSearchLength, 3, \ 3625 "max. # interp. frames to skip when searching for recompilee") \ 3626 \ 3627 develop(intx, DesiredMethodLimit, 8000, \ 3628 "desired max. method size (in bytecodes) after inlining") \ 3629 \ 3630 develop(intx, HugeMethodLimit, 8000, \ 3631 "don't compile methods larger than this if " \ 3632 "+DontCompileHugeMethods") \ 3633 \ 3634 /* New JDK 1.4 reflection implementation */ \ 3635 \ 3636 develop(bool, UseNewReflection, true, \ 3637 "Temporary flag for transition to reflection based on dynamic " \ 3638 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3639 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3640 "changes were needed") \ 3641 \ 3642 develop(bool, VerifyReflectionBytecodes, false, \ 3643 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3644 "in situations like that described in 4486457 or for " \ 3645 "constructors generated for serialization, so can not be enabled "\ 3646 "in product.") \ 3647 \ 3648 product(bool, ReflectionWrapResolutionErrors, true, \ 3649 "Temporary flag for transition to AbstractMethodError wrapped " \ 3650 "in InvocationTargetException. See 6531596") \ 3651 \ 3652 \ 3653 develop(intx, FastSuperclassLimit, 8, \ 3654 "Depth of hardwired instanceof accelerator array") \ 3655 \ 3656 /* Properties for Java libraries */ \ 3657 \ 3658 product(intx, MaxDirectMemorySize, -1, \ 3659 "Maximum total size of NIO direct-buffer allocations") \ 3660 \ 3661 /* temporary developer defined flags */ \ 3662 \ 3663 diagnostic(bool, UseNewCode, false, \ 3664 "Testing Only: Use the new version while testing") \ 3665 \ 3666 diagnostic(bool, UseNewCode2, false, \ 3667 "Testing Only: Use the new version while testing") \ 3668 \ 3669 diagnostic(bool, UseNewCode3, false, \ 3670 "Testing Only: Use the new version while testing") \ 3671 \ 3672 /* flags for performance data collection */ \ 3673 \ 3674 product(bool, UsePerfData, falseInEmbedded, \ 3675 "Flag to disable jvmstat instrumentation for performance testing" \ 3676 "and problem isolation purposes.") \ 3677 \ 3678 product(bool, PerfDataSaveToFile, false, \ 3679 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3680 \ 3681 product(ccstr, PerfDataSaveFile, NULL, \ 3682 "Save PerfData memory to the specified absolute pathname," \ 3683 "%p in the file name if present will be replaced by pid") \ 3684 \ 3685 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3686 "Data sampling interval in milliseconds") \ 3687 \ 3688 develop(bool, PerfTraceDataCreation, false, \ 3689 "Trace creation of Performance Data Entries") \ 3690 \ 3691 develop(bool, PerfTraceMemOps, false, \ 3692 "Trace PerfMemory create/attach/detach calls") \ 3693 \ 3694 product(bool, PerfDisableSharedMem, false, \ 3695 "Store performance data in standard memory") \ 3696 \ 3697 product(intx, PerfDataMemorySize, 32*K, \ 3698 "Size of performance data memory region. Will be rounded " \ 3699 "up to a multiple of the native os page size.") \ 3700 \ 3701 product(intx, PerfMaxStringConstLength, 1024, \ 3702 "Maximum PerfStringConstant string length before truncation") \ 3703 \ 3704 product(bool, PerfAllowAtExitRegistration, false, \ 3705 "Allow registration of atexit() methods") \ 3706 \ 3707 product(bool, PerfBypassFileSystemCheck, false, \ 3708 "Bypass Win32 file system criteria checks (Windows Only)") \ 3709 \ 3710 product(intx, UnguardOnExecutionViolation, 0, \ 3711 "Unguard page and retry on no-execute fault (Win32 only)" \ 3712 "0=off, 1=conservative, 2=aggressive") \ 3713 \ 3714 /* Serviceability Support */ \ 3715 \ 3716 product(bool, ManagementServer, false, \ 3717 "Create JMX Management Server") \ 3718 \ 3719 product(bool, DisableAttachMechanism, false, \ 3720 "Disable mechanism that allows tools to attach to this VM") \ 3721 \ 3722 product(bool, StartAttachListener, false, \ 3723 "Always start Attach Listener at VM startup") \ 3724 \ 3725 manageable(bool, PrintConcurrentLocks, false, \ 3726 "Print java.util.concurrent locks in thread dump") \ 3727 \ 3728 product(bool, TransmitErrorReport, false, \ 3729 "Enable error report transmission on erroneous termination") \ 3730 \ 3731 product(ccstr, ErrorReportServer, NULL, \ 3732 "Override built-in error report server address") \ 3733 \ 3734 /* Shared spaces */ \ 3735 \ 3736 product(bool, UseSharedSpaces, true, \ 3737 "Use shared spaces in the permanent generation") \ 3738 \ 3739 product(bool, RequireSharedSpaces, false, \ 3740 "Require shared spaces in the permanent generation") \ 3741 \ 3742 product(bool, DumpSharedSpaces, false, \ 3743 "Special mode: JVM reads a class list, loads classes, builds " \ 3744 "shared spaces, and dumps the shared spaces to a file to be " \ 3745 "used in future JVM runs.") \ 3746 \ 3747 product(bool, PrintSharedSpaces, false, \ 3748 "Print usage of shared spaces") \ 3749 \ 3750 product(uintx, SharedDummyBlockSize, 512*M, \ 3751 "Size of dummy block used to shift heap addresses (in bytes)") \ 3752 \ 3753 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3754 "Size of read-write space in permanent generation (in bytes)") \ 3755 \ 3756 product(uintx, SharedReadOnlySize, 10*M, \ 3757 "Size of read-only space in permanent generation (in bytes)") \ 3758 \ 3759 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3760 "Size of the shared data area adjacent to the heap (in bytes)") \ 3761 \ 3762 product(uintx, SharedMiscCodeSize, 4*M, \ 3763 "Size of the shared code area adjacent to the heap (in bytes)") \ 3764 \ 3765 diagnostic(bool, SharedOptimizeColdStart, true, \ 3766 "At dump time, order shared objects to achieve better " \ 3767 "cold startup time.") \ 3768 \ 3769 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3770 "Reordering policy for SharedOptimizeColdStart " \ 3771 "0=favor classload-time locality, 1=balanced, " \ 3772 "2=favor runtime locality") \ 3773 \ 3774 diagnostic(bool, SharedSkipVerify, false, \ 3775 "Skip assert() and verify() which page-in unwanted shared " \ 3776 "objects. ") \ 3777 \ 3778 diagnostic(bool, EnableInvokeDynamic, true, \ 3779 "support JSR 292 (method handles, invokedynamic, " \ 3780 "anonymous classes") \ 3781 \ 3782 product(bool, AnonymousClasses, false, \ 3783 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3784 \ 3785 experimental(bool, EnableMethodHandles, false, \ 3786 "support method handles (deprecated)") \ 3787 \ 3788 diagnostic(intx, MethodHandlePushLimit, 3, \ 3789 "number of additional stack slots a method handle may push") \ 3790 \ 3791 diagnostic(bool, PrintMethodHandleStubs, false, \ 3792 "Print generated stub code for method handles") \ 3793 \ 3794 develop(bool, TraceMethodHandles, false, \ 3795 "trace internal method handle operations") \ 3796 \ 3797 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3798 "perform extra checks when constructing method handles") \ 3799 \ 3800 diagnostic(bool, OptimizeMethodHandles, true, \ 3801 "when constructing method handles, try to improve them") \ 3802 \ 3803 develop(bool, StressMethodHandleWalk, false, \ 3804 "Process all method handles with MethodHandleWalk") \ 3805 \ 3806 diagnostic(bool, UseRicochetFrames, true, \ 3807 "use ricochet stack frames for method handle combination, " \ 3808 "if the platform supports them") \ 3809 \ 3810 experimental(bool, TrustFinalNonStaticFields, false, \ 3811 "trust final non-static declarations for constant folding") \ 3812 \ 3813 experimental(bool, AllowInvokeGeneric, false, \ 3814 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3815 "as equivalent methods") \ 3816 \ 3817 develop(bool, TraceInvokeDynamic, false, \ 3818 "trace internal invoke dynamic operations") \ 3819 \ 3820 diagnostic(bool, PauseAtStartup, false, \ 3821 "Causes the VM to pause at startup time and wait for the pause " \ 3822 "file to be removed (default: ./vm.paused.<pid>)") \ 3823 \ 3824 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3825 "The file to create and for whose removal to await when pausing " \ 3826 "at startup. (default: ./vm.paused.<pid>)") \ 3827 \ 3828 diagnostic(bool, PauseAtExit, false, \ 3829 "Pause and wait for keypress on exit if a debugger is attached") \ 3830 \ 3831 product(bool, ExtendedDTraceProbes, false, \ 3832 "Enable performance-impacting dtrace probes") \ 3833 \ 3834 product(bool, DTraceMethodProbes, false, \ 3835 "Enable dtrace probes for method-entry and method-exit") \ 3836 \ 3837 product(bool, DTraceAllocProbes, false, \ 3838 "Enable dtrace probes for object allocation") \ 3839 \ 3840 product(bool, DTraceMonitorProbes, false, \ 3841 "Enable dtrace probes for monitor events") \ 3842 \ 3843 product(bool, RelaxAccessControlCheck, false, \ 3844 "Relax the access control checks in the verifier") \ 3845 \ 3846 diagnostic(bool, PrintDTraceDOF, false, \ 3847 "Print the DTrace DOF passed to the system for JSDT probes") \ 3848 \ 3849 product(uintx, StringTableSize, 1009, \ 3850 "Number of buckets in the interned String table") \ 3851 \ 3852 product(bool, UseVMInterruptibleIO, false, \ 3853 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3854 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3855 " of this flag is true for JDK 6 and earliers") 3856 3857 /* 3858 * Macros for factoring of globals 3859 */ 3860 3861 // Interface macros 3862 #define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3863 #define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3864 #define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3865 #define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3866 #define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3867 #define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3868 #ifdef PRODUCT 3869 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3870 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3871 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3872 #else 3873 #define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3874 #define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3875 #define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3876 #endif 3877 // Special LP64 flags, product only needed for now. 3878 #ifdef _LP64 3879 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3880 #else 3881 #define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3882 #endif // _LP64 3883 3884 // Implementation macros 3885 #define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3886 #define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3887 #define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3888 #define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3889 #define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3890 #define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3891 #ifdef PRODUCT 3892 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3893 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3894 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3895 #else 3896 #define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3897 #define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3898 #define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3899 #endif 3900 #ifdef _LP64 3901 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3902 #else 3903 #define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3904 #endif // _LP64 3905 3906 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) 3907 3908 RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3909 3910 #endif // SHARE_VM_RUNTIME_GLOBALS_HPP