globals.hpp revision 2617:1af104d6cf99
150476Speter/* 215353Swosch * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. 318566Sbde * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 431859Sbde * 515353Swosch * This code is free software; you can redistribute it and/or modify it 615353Swosch * under the terms of the GNU General Public License version 2 only, as 715353Swosch * published by the Free Software Foundation. 833815Sbde * 915948Swosch * This code is distributed in the hope that it will be useful, but WITHOUT 1033815Sbde * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 1133815Sbde * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 1218566Sbde * version 2 for more details (a copy is included in the LICENSE file that 1399202Sru * accompanied this code). 1499202Sru * 1518566Sbde * You should have received a copy of the GNU General Public License version 1615353Swosch * 2 along with this work; if not, write to the Free Software Foundation, 1718566Sbde * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 1818566Sbde * 1918566Sbde * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2099202Sru * or visit www.oracle.com if you need additional information or have any 2199202Sru * questions. 2218566Sbde * 2318566Sbde */ 2418340Sswallace 2515948Swosch#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 2618566Sbde#define SHARE_VM_RUNTIME_GLOBALS_HPP 2718566Sbde 2815353Swosch#include "utilities/debug.hpp" 2915353Swosch#ifdef TARGET_ARCH_x86 3015353Swosch# include "globals_x86.hpp" 3115353Swosch#endif 3233815Sbde#ifdef TARGET_ARCH_sparc 3315353Swosch# include "globals_sparc.hpp" 3415353Swosch#endif 3516663Sjkh#ifdef TARGET_ARCH_zero 3615353Swosch# include "globals_zero.hpp" 3715353Swosch#endif 3816663Sjkh#ifdef TARGET_ARCH_arm 3915353Swosch# include "globals_arm.hpp" 4014801Swosch#endif 4194940Sru#ifdef TARGET_ARCH_ppc 4294940Sru# include "globals_ppc.hpp" 4394940Sru#endif 4494940Sru#ifdef TARGET_OS_FAMILY_linux 4564784Ssheldonh# include "globals_linux.hpp" 4618340Sswallace#endif 4718340Sswallace#ifdef TARGET_OS_FAMILY_solaris 4818340Sswallace# include "globals_solaris.hpp" 4918340Sswallace#endif 5014801Swosch#ifdef TARGET_OS_FAMILY_windows 5118340Sswallace# include "globals_windows.hpp" 5276896Sru#endif 5318340Sswallace#ifdef TARGET_OS_ARCH_linux_x86 5476896Sru# include "globals_linux_x86.hpp" 5576896Sru#endif 5676896Sru#ifdef TARGET_OS_ARCH_linux_sparc 5776896Sru# include "globals_linux_sparc.hpp" 5876896Sru#endif 5976896Sru#ifdef TARGET_OS_ARCH_linux_zero 6076896Sru# include "globals_linux_zero.hpp" 6176896Sru#endif 6276896Sru#ifdef TARGET_OS_ARCH_solaris_x86 6376896Sru# include "globals_solaris_x86.hpp" 6476896Sru#endif 6576896Sru#ifdef TARGET_OS_ARCH_solaris_sparc 6676896Sru# include "globals_solaris_sparc.hpp" 6718340Sswallace#endif 6876896Sru#ifdef TARGET_OS_ARCH_windows_x86 6976896Sru# include "globals_windows_x86.hpp" 7076896Sru#endif 7118340Sswallace#ifdef TARGET_OS_ARCH_linux_arm 7218373Speter# include "globals_linux_arm.hpp" 7376896Sru#endif 7418373Speter#ifdef TARGET_OS_ARCH_linux_ppc 7518340Sswallace# include "globals_linux_ppc.hpp" 7618340Sswallace#endif 7718340Sswallace#ifdef COMPILER1 7818340Sswallace#ifdef TARGET_ARCH_x86 7998546Sru# include "c1_globals_x86.hpp" 8098546Sru#endif 8114801Swosch#ifdef TARGET_ARCH_sparc 8225316Sbde# include "c1_globals_sparc.hpp" 8318340Sswallace#endif 8425316Sbde#ifdef TARGET_ARCH_arm 8518340Sswallace# include "c1_globals_arm.hpp" 8616663Sjkh#endif 8716663Sjkh#ifdef TARGET_ARCH_ppc 8818340Sswallace# include "c1_globals_ppc.hpp" 8916663Sjkh#endif 9014801Swosch#ifdef TARGET_OS_FAMILY_linux 9114801Swosch# include "c1_globals_linux.hpp" 9244922Sbde#endif 9395306Sru#ifdef TARGET_OS_FAMILY_solaris 9444922Sbde# include "c1_globals_solaris.hpp" 9544922Sbde#endif 9644922Sbde#ifdef TARGET_OS_FAMILY_windows 9744922Sbde# include "c1_globals_windows.hpp" 9844922Sbde#endif 9944922Sbde#endif 10044922Sbde#ifdef COMPILER2 10198546Sru#ifdef TARGET_ARCH_x86 10244922Sbde# include "c2_globals_x86.hpp" 10315166Swosch#endif 10417116Spst#ifdef TARGET_ARCH_sparc 10517116Spst# include "c2_globals_sparc.hpp" 10617116Spst#endif 10717116Spst#ifdef TARGET_ARCH_arm 10836641Speter# include "c2_globals_arm.hpp" 10917116Spst#endif 11017116Spst#ifdef TARGET_OS_FAMILY_linux 11116663Sjkh# include "c2_globals_linux.hpp" 11276021Sru#endif 11376021Sru#ifdef TARGET_OS_FAMILY_solaris 11476021Sru# include "c2_globals_solaris.hpp" 11576021Sru#endif 11676021Sru#ifdef TARGET_OS_FAMILY_windows 11716663Sjkh# include "c2_globals_windows.hpp" 11815166Swosch#endif 11931859Sbde#endif 12095306Sru#ifdef SHARK 12131859Sbde#ifdef TARGET_ARCH_zero 12231859Sbde# include "shark_globals_zero.hpp" 12316663Sjkh#endif 12433815Sbde#endif 12533815Sbde 12615166Swosch#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 12733815Sbdedefine_pd_global(bool, BackgroundCompilation, false); 12815166Swoschdefine_pd_global(bool, UseTLAB, false); 12918427Sbdedefine_pd_global(bool, CICompileOSR, false); 13095306Srudefine_pd_global(bool, UseTypeProfile, false); 13118427Sbdedefine_pd_global(bool, UseOnStackReplacement, false); 13218427Sbdedefine_pd_global(bool, InlineIntrinsics, false); 13338655Sjbdefine_pd_global(bool, PreferInterpreterNativeStubs, true); 13434576Sbdedefine_pd_global(bool, ProfileInterpreter, false); 13534576Sbdedefine_pd_global(bool, ProfileTraps, false); 13634576Sbdedefine_pd_global(bool, TieredCompilation, false); 13734576Sbde 13834576Sbdedefine_pd_global(intx, CompileThreshold, 0); 13918427Sbdedefine_pd_global(intx, BackEdgeThreshold, 0); 14034576Sbde 14134576Sbdedefine_pd_global(intx, OnStackReplacePercentage, 0); 14218427Sbdedefine_pd_global(bool, ResizeTLAB, false); 14331859Sbdedefine_pd_global(intx, FreqInlineSize, 0); 14494410Srudefine_pd_global(intx, InlineSmallCode, 0); 14531859Sbdedefine_pd_global(intx, NewSizeThreadIncrease, 4*K); 14631859Sbdedefine_pd_global(intx, InlineClassNatives, true); 14734576Sbdedefine_pd_global(intx, InlineUnsafeOps, true); 14834576Sbdedefine_pd_global(intx, InitialCodeCacheSize, 160*K); 14931859Sbdedefine_pd_global(intx, ReservedCodeCacheSize, 32*M); 15018427Sbdedefine_pd_global(intx, CodeCacheExpansionSize, 32*K); 15118427Sbdedefine_pd_global(intx, CodeCacheMinBlockLength, 1); 15231859Sbdedefine_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 15318427Sbdedefine_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 15495306Srudefine_pd_global(bool, NeverActAsServerClassMachine, true); 15535789Sbdedefine_pd_global(uint64_t,MaxRAM, 1ULL*G); 15695368Sru#define CI_COMPILER_COUNT 0 15795368Sru#else 15895368Sru 15995368Sru#ifdef COMPILER2 16095368Sru#define CI_COMPILER_COUNT 2 16195368Sru#else 16295368Sru#define CI_COMPILER_COUNT 1 16395368Sru#endif // COMPILER2 16495306Sru 16535789Sbde#endif // no compilers 16694940Sru 167 168// string type aliases used only in this file 169typedef const char* ccstr; 170typedef const char* ccstrlist; // represents string arguments which accumulate 171 172enum FlagValueOrigin { 173 DEFAULT = 0, 174 COMMAND_LINE = 1, 175 ENVIRON_VAR = 2, 176 CONFIG_FILE = 3, 177 MANAGEMENT = 4, 178 ERGONOMIC = 5, 179 ATTACH_ON_DEMAND = 6, 180 INTERNAL = 99 181}; 182 183struct Flag { 184 const char *type; 185 const char *name; 186 void* addr; 187 188 NOT_PRODUCT(const char *doc;) 189 190 const char *kind; 191 FlagValueOrigin origin; 192 193 // points to all Flags static array 194 static Flag *flags; 195 196 // number of flags 197 static size_t numFlags; 198 199 static Flag* find_flag(char* name, size_t length); 200 201 bool is_bool() const { return strcmp(type, "bool") == 0; } 202 bool get_bool() const { return *((bool*) addr); } 203 void set_bool(bool value) { *((bool*) addr) = value; } 204 205 bool is_intx() const { return strcmp(type, "intx") == 0; } 206 intx get_intx() const { return *((intx*) addr); } 207 void set_intx(intx value) { *((intx*) addr) = value; } 208 209 bool is_uintx() const { return strcmp(type, "uintx") == 0; } 210 uintx get_uintx() const { return *((uintx*) addr); } 211 void set_uintx(uintx value) { *((uintx*) addr) = value; } 212 213 bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 214 uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 215 void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 216 217 bool is_double() const { return strcmp(type, "double") == 0; } 218 double get_double() const { return *((double*) addr); } 219 void set_double(double value) { *((double*) addr) = value; } 220 221 bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 222 bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 223 ccstr get_ccstr() const { return *((ccstr*) addr); } 224 void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 225 226 bool is_unlocker() const; 227 bool is_unlocked() const; 228 bool is_writeable() const; 229 bool is_external() const; 230 231 void print_on(outputStream* st, bool withComments = false ); 232 void print_as_flag(outputStream* st); 233}; 234 235// debug flags control various aspects of the VM and are global accessible 236 237// use FlagSetting to temporarily change some debug flag 238// e.g. FlagSetting fs(DebugThisAndThat, true); 239// restored to previous value upon leaving scope 240class FlagSetting { 241 bool val; 242 bool* flag; 243 public: 244 FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 245 ~FlagSetting() { *flag = val; } 246}; 247 248 249class CounterSetting { 250 intx* counter; 251 public: 252 CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 253 ~CounterSetting() { (*counter)--; } 254}; 255 256 257class IntFlagSetting { 258 intx val; 259 intx* flag; 260 public: 261 IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 262 ~IntFlagSetting() { *flag = val; } 263}; 264 265 266class DoubleFlagSetting { 267 double val; 268 double* flag; 269 public: 270 DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 271 ~DoubleFlagSetting() { *flag = val; } 272}; 273 274 275class CommandLineFlags { 276 public: 277 static bool boolAt(char* name, size_t len, bool* value); 278 static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 279 static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 280 static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 281 282 static bool intxAt(char* name, size_t len, intx* value); 283 static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 284 static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 285 static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 286 287 static bool uintxAt(char* name, size_t len, uintx* value); 288 static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 289 static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 290 static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 291 292 static bool uint64_tAt(char* name, size_t len, uint64_t* value); 293 static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 294 static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 295 static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 296 297 static bool doubleAt(char* name, size_t len, double* value); 298 static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 299 static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 300 static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 301 302 static bool ccstrAt(char* name, size_t len, ccstr* value); 303 static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 304 static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 305 static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 306 307 // Returns false if name is not a command line flag. 308 static bool wasSetOnCmdline(const char* name, bool* value); 309 static void printSetFlags(); 310 311 static void printFlags(bool withComments = false ); 312 313 static void verify() PRODUCT_RETURN; 314}; 315 316// use this for flags that are true by default in the debug version but 317// false in the optimized version, and vice versa 318#ifdef ASSERT 319#define trueInDebug true 320#define falseInDebug false 321#else 322#define trueInDebug false 323#define falseInDebug true 324#endif 325 326// use this for flags that are true per default in the product build 327// but false in development builds, and vice versa 328#ifdef PRODUCT 329#define trueInProduct true 330#define falseInProduct false 331#else 332#define trueInProduct false 333#define falseInProduct true 334#endif 335 336// use this for flags that are true per default in the tiered build 337// but false in non-tiered builds, and vice versa 338#ifdef TIERED 339#define trueInTiered true 340#define falseInTiered false 341#else 342#define trueInTiered false 343#define falseInTiered true 344#endif 345 346#ifdef JAVASE_EMBEDDED 347#define falseInEmbedded false 348#else 349#define falseInEmbedded true 350#endif 351 352// develop flags are settable / visible only during development and are constant in the PRODUCT version 353// product flags are always settable / visible 354// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 355 356// A flag must be declared with one of the following types: 357// bool, intx, uintx, ccstr. 358// The type "ccstr" is an alias for "const char*" and is used 359// only in this file, because the macrology requires single-token type names. 360 361// Note: Diagnostic options not meant for VM tuning or for product modes. 362// They are to be used for VM quality assurance or field diagnosis 363// of VM bugs. They are hidden so that users will not be encouraged to 364// try them as if they were VM ordinary execution options. However, they 365// are available in the product version of the VM. Under instruction 366// from support engineers, VM customers can turn them on to collect 367// diagnostic information about VM problems. To use a VM diagnostic 368// option, you must first specify +UnlockDiagnosticVMOptions. 369// (This master switch also affects the behavior of -Xprintflags.) 370// 371// experimental flags are in support of features that are not 372// part of the officially supported product, but are available 373// for experimenting with. They could, for example, be performance 374// features that may not have undergone full or rigorous QA, but which may 375// help performance in some cases and released for experimentation 376// by the community of users and developers. This flag also allows one to 377// be able to build a fully supported product that nonetheless also 378// ships with some unsupported, lightly tested, experimental features. 379// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 380// UnlockExperimentalVMOptions flag, which allows the control and 381// modification of the experimental flags. 382// 383// Nota bene: neither diagnostic nor experimental options should be used casually, 384// and they are not supported on production loads, except under explicit 385// direction from support engineers. 386// 387// manageable flags are writeable external product flags. 388// They are dynamically writeable through the JDK management interface 389// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 390// These flags are external exported interface (see CCC). The list of 391// manageable flags can be queried programmatically through the management 392// interface. 393// 394// A flag can be made as "manageable" only if 395// - the flag is defined in a CCC as an external exported interface. 396// - the VM implementation supports dynamic setting of the flag. 397// This implies that the VM must *always* query the flag variable 398// and not reuse state related to the flag state at any given time. 399// - you want the flag to be queried programmatically by the customers. 400// 401// product_rw flags are writeable internal product flags. 402// They are like "manageable" flags but for internal/private use. 403// The list of product_rw flags are internal/private flags which 404// may be changed/removed in a future release. It can be set 405// through the management interface to get/set value 406// when the name of flag is supplied. 407// 408// A flag can be made as "product_rw" only if 409// - the VM implementation supports dynamic setting of the flag. 410// This implies that the VM must *always* query the flag variable 411// and not reuse state related to the flag state at any given time. 412// 413// Note that when there is a need to support develop flags to be writeable, 414// it can be done in the same way as product_rw. 415 416#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 417 \ 418 lp64_product(bool, UseCompressedOops, false, \ 419 "Use 32-bit object references in 64-bit VM. " \ 420 "lp64_product means flag is always constant in 32 bit VM") \ 421 \ 422 notproduct(bool, CheckCompressedOops, true, \ 423 "generate checks in encoding/decoding code in debug VM") \ 424 \ 425 product_pd(uintx, HeapBaseMinAddress, \ 426 "OS specific low limit for heap base address") \ 427 \ 428 diagnostic(bool, PrintCompressedOopsMode, false, \ 429 "Print compressed oops base address and encoding mode") \ 430 \ 431 lp64_product(intx, ObjectAlignmentInBytes, 8, \ 432 "Default object alignment in bytes, 8 is minimum") \ 433 \ 434 /* UseMembar is theoretically a temp flag used for memory barrier \ 435 * removal testing. It was supposed to be removed before FCS but has \ 436 * been re-added (see 6401008) */ \ 437 product_pd(bool, UseMembar, \ 438 "(Unstable) Issues membars on thread state transitions") \ 439 \ 440 /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 441 * that don't support it. This will be replaced by processor detection \ 442 * logic. \ 443 */ \ 444 product(bool, UsePPCLWSYNC, true, \ 445 "Use lwsync instruction if true, else use slower sync") \ 446 \ 447 develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 448 "Whether to clean the chunk pool asynchronously") \ 449 \ 450 /* Temporary: See 6948537 */ \ 451 experimental(bool, UseMemSetInBOT, true, \ 452 "(Unstable) uses memset in BOT updates in GC code") \ 453 \ 454 diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 455 "Enable normal processing of flags relating to field diagnostics")\ 456 \ 457 experimental(bool, UnlockExperimentalVMOptions, false, \ 458 "Enable normal processing of flags relating to experimental features")\ 459 \ 460 product(bool, JavaMonitorsInStackTrace, true, \ 461 "Print info. about Java monitor locks when the stacks are dumped")\ 462 \ 463 product_pd(bool, UseLargePages, \ 464 "Use large page memory") \ 465 \ 466 product_pd(bool, UseLargePagesIndividualAllocation, \ 467 "Allocate large pages individually for better affinity") \ 468 \ 469 develop(bool, LargePagesIndividualAllocationInjectError, false, \ 470 "Fail large pages individual allocation") \ 471 \ 472 develop(bool, TracePageSizes, false, \ 473 "Trace page size selection and usage.") \ 474 \ 475 product(bool, UseNUMA, false, \ 476 "Use NUMA if available") \ 477 \ 478 product(bool, ForceNUMA, false, \ 479 "Force NUMA optimizations on single-node/UMA systems") \ 480 \ 481 product(intx, NUMAChunkResizeWeight, 20, \ 482 "Percentage (0-100) used to weight the current sample when " \ 483 "computing exponentially decaying average for " \ 484 "AdaptiveNUMAChunkSizing") \ 485 \ 486 product(intx, NUMASpaceResizeRate, 1*G, \ 487 "Do not reallocate more that this amount per collection") \ 488 \ 489 product(bool, UseAdaptiveNUMAChunkSizing, true, \ 490 "Enable adaptive chunk sizing for NUMA") \ 491 \ 492 product(bool, NUMAStats, false, \ 493 "Print NUMA stats in detailed heap information") \ 494 \ 495 product(intx, NUMAPageScanRate, 256, \ 496 "Maximum number of pages to include in the page scan procedure") \ 497 \ 498 product_pd(bool, NeedsDeoptSuspend, \ 499 "True for register window machines (sparc/ia64)") \ 500 \ 501 product(intx, UseSSE, 99, \ 502 "Highest supported SSE instructions set on x86/x64") \ 503 \ 504 product(intx, UseVIS, 99, \ 505 "Highest supported VIS instructions set on Sparc") \ 506 \ 507 product(uintx, LargePageSizeInBytes, 0, \ 508 "Large page size (0 to let VM choose the page size") \ 509 \ 510 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 511 "Use large pages if max heap is at least this big") \ 512 \ 513 product(bool, ForceTimeHighResolution, false, \ 514 "Using high time resolution(For Win32 only)") \ 515 \ 516 develop(bool, TraceItables, false, \ 517 "Trace initialization and use of itables") \ 518 \ 519 develop(bool, TracePcPatching, false, \ 520 "Trace usage of frame::patch_pc") \ 521 \ 522 develop(bool, TraceJumps, false, \ 523 "Trace assembly jumps in thread ring buffer") \ 524 \ 525 develop(bool, TraceRelocator, false, \ 526 "Trace the bytecode relocator") \ 527 \ 528 develop(bool, TraceLongCompiles, false, \ 529 "Print out every time compilation is longer than " \ 530 "a given threashold") \ 531 \ 532 develop(bool, SafepointALot, false, \ 533 "Generates a lot of safepoints. Works with " \ 534 "GuaranteedSafepointInterval") \ 535 \ 536 product_pd(bool, BackgroundCompilation, \ 537 "A thread requesting compilation is not blocked during " \ 538 "compilation") \ 539 \ 540 product(bool, PrintVMQWaitTime, false, \ 541 "Prints out the waiting time in VM operation queue") \ 542 \ 543 develop(bool, BailoutToInterpreterForThrows, false, \ 544 "Compiled methods which throws/catches exceptions will be " \ 545 "deopt and intp.") \ 546 \ 547 develop(bool, NoYieldsInMicrolock, false, \ 548 "Disable yields in microlock") \ 549 \ 550 develop(bool, TraceOopMapGeneration, false, \ 551 "Shows oopmap generation") \ 552 \ 553 product(bool, MethodFlushing, true, \ 554 "Reclamation of zombie and not-entrant methods") \ 555 \ 556 develop(bool, VerifyStack, false, \ 557 "Verify stack of each thread when it is entering a runtime call") \ 558 \ 559 develop(bool, ForceUnreachable, false, \ 560 "(amd64) Make all non code cache addresses to be unreachable with rip-rel forcing use of 64bit literal fixups") \ 561 \ 562 notproduct(bool, StressDerivedPointers, false, \ 563 "Force scavenge when a derived pointers is detected on stack " \ 564 "after rtm call") \ 565 \ 566 develop(bool, TraceDerivedPointers, false, \ 567 "Trace traversal of derived pointers on stack") \ 568 \ 569 notproduct(bool, TraceCodeBlobStacks, false, \ 570 "Trace stack-walk of codeblobs") \ 571 \ 572 product(bool, PrintJNIResolving, false, \ 573 "Used to implement -v:jni") \ 574 \ 575 notproduct(bool, PrintRewrites, false, \ 576 "Print methods that are being rewritten") \ 577 \ 578 product(bool, UseInlineCaches, true, \ 579 "Use Inline Caches for virtual calls ") \ 580 \ 581 develop(bool, InlineArrayCopy, true, \ 582 "inline arraycopy native that is known to be part of " \ 583 "base library DLL") \ 584 \ 585 develop(bool, InlineObjectHash, true, \ 586 "inline Object::hashCode() native that is known to be part " \ 587 "of base library DLL") \ 588 \ 589 develop(bool, InlineObjectCopy, true, \ 590 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 591 \ 592 develop(bool, InlineNatives, true, \ 593 "inline natives that are known to be part of base library DLL") \ 594 \ 595 develop(bool, InlineMathNatives, true, \ 596 "inline SinD, CosD, etc.") \ 597 \ 598 develop(bool, InlineClassNatives, true, \ 599 "inline Class.isInstance, etc") \ 600 \ 601 develop(bool, InlineAtomicLong, true, \ 602 "inline sun.misc.AtomicLong") \ 603 \ 604 develop(bool, InlineThreadNatives, true, \ 605 "inline Thread.currentThread, etc") \ 606 \ 607 develop(bool, InlineReflectionGetCallerClass, true, \ 608 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 609 "of base library DLL") \ 610 \ 611 develop(bool, InlineUnsafeOps, true, \ 612 "inline memory ops (native methods) from sun.misc.Unsafe") \ 613 \ 614 develop(bool, ConvertCmpD2CmpF, true, \ 615 "Convert cmpD to cmpF when one input is constant in float range") \ 616 \ 617 develop(bool, ConvertFloat2IntClipping, true, \ 618 "Convert float2int clipping idiom to integer clipping") \ 619 \ 620 develop(bool, SpecialStringCompareTo, true, \ 621 "special version of string compareTo") \ 622 \ 623 develop(bool, SpecialStringIndexOf, true, \ 624 "special version of string indexOf") \ 625 \ 626 develop(bool, SpecialStringEquals, true, \ 627 "special version of string equals") \ 628 \ 629 develop(bool, SpecialArraysEquals, true, \ 630 "special version of Arrays.equals(char[],char[])") \ 631 \ 632 product(bool, UseSSE42Intrinsics, false, \ 633 "SSE4.2 versions of intrinsics") \ 634 \ 635 product(bool, UseCondCardMark, false, \ 636 "Check for already marked card before updating card table") \ 637 \ 638 develop(bool, TraceCallFixup, false, \ 639 "traces all call fixups") \ 640 \ 641 develop(bool, DeoptimizeALot, false, \ 642 "deoptimize at every exit from the runtime system") \ 643 \ 644 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 645 "a comma separated list of bcis to deoptimize at") \ 646 \ 647 product(bool, DeoptimizeRandom, false, \ 648 "deoptimize random frames on random exit from the runtime system")\ 649 \ 650 notproduct(bool, ZombieALot, false, \ 651 "creates zombies (non-entrant) at exit from the runt. system") \ 652 \ 653 product(bool, UnlinkSymbolsALot, false, \ 654 "unlink unreferenced symbols from the symbol table at safepoints")\ 655 \ 656 notproduct(bool, WalkStackALot, false, \ 657 "trace stack (no print) at every exit from the runtime system") \ 658 \ 659 develop(bool, Debugging, false, \ 660 "set when executing debug methods in debug.ccp " \ 661 "(to prevent triggering assertions)") \ 662 \ 663 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 664 "Enable strict checks that safepoints cannot happen for threads " \ 665 "that used No_Safepoint_Verifier") \ 666 \ 667 notproduct(bool, VerifyLastFrame, false, \ 668 "Verify oops on last frame on entry to VM") \ 669 \ 670 develop(bool, TraceHandleAllocation, false, \ 671 "Prints out warnings when suspicious many handles are allocated") \ 672 \ 673 product(bool, UseCompilerSafepoints, true, \ 674 "Stop at safepoints in compiled code") \ 675 \ 676 product(bool, UseSplitVerifier, true, \ 677 "use split verifier with StackMapTable attributes") \ 678 \ 679 product(bool, FailOverToOldVerifier, true, \ 680 "fail over to old verifier when split verifier fails") \ 681 \ 682 develop(bool, ShowSafepointMsgs, false, \ 683 "Show msg. about safepoint synch.") \ 684 \ 685 product(bool, SafepointTimeout, false, \ 686 "Time out and warn or fail after SafepointTimeoutDelay " \ 687 "milliseconds if failed to reach safepoint") \ 688 \ 689 develop(bool, DieOnSafepointTimeout, false, \ 690 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 691 \ 692 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 693 /* typically, at most a few retries are needed */ \ 694 product(intx, SuspendRetryCount, 50, \ 695 "Maximum retry count for an external suspend request") \ 696 \ 697 product(intx, SuspendRetryDelay, 5, \ 698 "Milliseconds to delay per retry (* current_retry_count)") \ 699 \ 700 product(bool, AssertOnSuspendWaitFailure, false, \ 701 "Assert/Guarantee on external suspend wait failure") \ 702 \ 703 product(bool, TraceSuspendWaitFailures, false, \ 704 "Trace external suspend wait failures") \ 705 \ 706 product(bool, MaxFDLimit, true, \ 707 "Bump the number of file descriptors to max in solaris.") \ 708 \ 709 notproduct(bool, LogEvents, trueInDebug, \ 710 "Enable Event log") \ 711 \ 712 product(bool, BytecodeVerificationRemote, true, \ 713 "Enables the Java bytecode verifier for remote classes") \ 714 \ 715 product(bool, BytecodeVerificationLocal, false, \ 716 "Enables the Java bytecode verifier for local classes") \ 717 \ 718 develop(bool, ForceFloatExceptions, trueInDebug, \ 719 "Force exceptions on FP stack under/overflow") \ 720 \ 721 develop(bool, SoftMatchFailure, trueInProduct, \ 722 "If the DFA fails to match a node, print a message and bail out") \ 723 \ 724 develop(bool, VerifyStackAtCalls, false, \ 725 "Verify that the stack pointer is unchanged after calls") \ 726 \ 727 develop(bool, TraceJavaAssertions, false, \ 728 "Trace java language assertions") \ 729 \ 730 notproduct(bool, CheckAssertionStatusDirectives, false, \ 731 "temporary - see javaClasses.cpp") \ 732 \ 733 notproduct(bool, PrintMallocFree, false, \ 734 "Trace calls to C heap malloc/free allocation") \ 735 \ 736 product(bool, PrintOopAddress, false, \ 737 "Always print the location of the oop") \ 738 \ 739 notproduct(bool, VerifyCodeCacheOften, false, \ 740 "Verify compiled-code cache often") \ 741 \ 742 develop(bool, ZapDeadCompiledLocals, false, \ 743 "Zap dead locals in compiler frames") \ 744 \ 745 notproduct(bool, ZapDeadLocalsOld, false, \ 746 "Zap dead locals (old version, zaps all frames when " \ 747 "entering the VM") \ 748 \ 749 notproduct(bool, CheckOopishValues, false, \ 750 "Warn if value contains oop ( requires ZapDeadLocals)") \ 751 \ 752 develop(bool, UseMallocOnly, false, \ 753 "use only malloc/free for allocation (no resource area/arena)") \ 754 \ 755 develop(bool, PrintMalloc, false, \ 756 "print all malloc/free calls") \ 757 \ 758 develop(bool, PrintMallocStatistics, false, \ 759 "print malloc/free statistics") \ 760 \ 761 develop(bool, ZapResourceArea, trueInDebug, \ 762 "Zap freed resource/arena space with 0xABABABAB") \ 763 \ 764 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 765 "Zap freed VM handle space with 0xBCBCBCBC") \ 766 \ 767 develop(bool, ZapJNIHandleArea, trueInDebug, \ 768 "Zap freed JNI handle space with 0xFEFEFEFE") \ 769 \ 770 notproduct(bool, ZapStackSegments, trueInDebug, \ 771 "Zap allocated/freed Stack segments with 0xFADFADED") \ 772 \ 773 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 774 "Zap unused heap space with 0xBAADBABE") \ 775 \ 776 develop(bool, TraceZapUnusedHeapArea, false, \ 777 "Trace zapping of unused heap space") \ 778 \ 779 develop(bool, CheckZapUnusedHeapArea, false, \ 780 "Check zapping of unused heap space") \ 781 \ 782 develop(bool, ZapFillerObjects, trueInDebug, \ 783 "Zap filler objects with 0xDEAFBABE") \ 784 \ 785 develop(bool, PrintVMMessages, true, \ 786 "Print vm messages on console") \ 787 \ 788 product(bool, PrintGCApplicationConcurrentTime, false, \ 789 "Print the time the application has been running") \ 790 \ 791 product(bool, PrintGCApplicationStoppedTime, false, \ 792 "Print the time the application has been stopped") \ 793 \ 794 notproduct(uintx, ErrorHandlerTest, 0, \ 795 "If > 0, provokes an error after VM initialization; the value" \ 796 "determines which error to provoke. See test_error_handler()" \ 797 "in debug.cpp.") \ 798 \ 799 develop(bool, Verbose, false, \ 800 "Prints additional debugging information from other modes") \ 801 \ 802 develop(bool, PrintMiscellaneous, false, \ 803 "Prints uncategorized debugging information (requires +Verbose)") \ 804 \ 805 develop(bool, WizardMode, false, \ 806 "Prints much more debugging information") \ 807 \ 808 product(bool, ShowMessageBoxOnError, false, \ 809 "Keep process alive on VM fatal error") \ 810 \ 811 product(bool, CreateMinidumpOnCrash, false, \ 812 "Create minidump on VM fatal error") \ 813 \ 814 product_pd(bool, UseOSErrorReporting, \ 815 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 816 \ 817 product(bool, SuppressFatalErrorMessage, false, \ 818 "Do NO Fatal Error report [Avoid deadlock]") \ 819 \ 820 product(ccstrlist, OnError, "", \ 821 "Run user-defined commands on fatal error; see VMError.cpp " \ 822 "for examples") \ 823 \ 824 product(ccstrlist, OnOutOfMemoryError, "", \ 825 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 826 \ 827 manageable(bool, HeapDumpBeforeFullGC, false, \ 828 "Dump heap to file before any major stop-world GC") \ 829 \ 830 manageable(bool, HeapDumpAfterFullGC, false, \ 831 "Dump heap to file after any major stop-world GC") \ 832 \ 833 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 834 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 835 \ 836 manageable(ccstr, HeapDumpPath, NULL, \ 837 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 838 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 839 "in the working directory)") \ 840 \ 841 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 842 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 843 "when the heap usage is larger than this") \ 844 \ 845 develop(uintx, HeapDumpSegmentSize, 1*G, \ 846 "Approximate segment size when generating a segmented heap dump") \ 847 \ 848 develop(bool, BreakAtWarning, false, \ 849 "Execute breakpoint upon encountering VM warning") \ 850 \ 851 product_pd(bool, UseVectoredExceptions, \ 852 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 853 \ 854 develop(bool, TraceVMOperation, false, \ 855 "Trace vm operations") \ 856 \ 857 develop(bool, UseFakeTimers, false, \ 858 "Tells whether the VM should use system time or a fake timer") \ 859 \ 860 diagnostic(bool, LogCompilation, false, \ 861 "Log compilation activity in detail to hotspot.log or LogFile") \ 862 \ 863 product(bool, PrintCompilation, false, \ 864 "Print compilations") \ 865 \ 866 diagnostic(bool, TraceNMethodInstalls, false, \ 867 "Trace nmethod intallation") \ 868 \ 869 diagnostic(intx, ScavengeRootsInCode, 1, \ 870 "0: do not allow scavengable oops in the code cache; " \ 871 "1: allow scavenging from the code cache; " \ 872 "2: emit as many constants as the compiler can see") \ 873 \ 874 diagnostic(bool, TraceOSRBreakpoint, false, \ 875 "Trace OSR Breakpoint ") \ 876 \ 877 diagnostic(bool, TraceCompileTriggered, false, \ 878 "Trace compile triggered") \ 879 \ 880 diagnostic(bool, TraceTriggers, false, \ 881 "Trace triggers") \ 882 \ 883 product(bool, AlwaysRestoreFPU, false, \ 884 "Restore the FPU control word after every JNI call (expensive)") \ 885 \ 886 notproduct(bool, PrintCompilation2, false, \ 887 "Print additional statistics per compilation") \ 888 \ 889 diagnostic(bool, PrintAdapterHandlers, false, \ 890 "Print code generated for i2c/c2i adapters") \ 891 \ 892 develop(bool, VerifyAdapterSharing, false, \ 893 "Verify that the code for shared adapters is the equivalent") \ 894 \ 895 diagnostic(bool, PrintAssembly, false, \ 896 "Print assembly code (using external disassembler.so)") \ 897 \ 898 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 899 "Options string passed to disassembler.so") \ 900 \ 901 diagnostic(bool, PrintNMethods, false, \ 902 "Print assembly code for nmethods when generated") \ 903 \ 904 diagnostic(bool, PrintNativeNMethods, false, \ 905 "Print assembly code for native nmethods when generated") \ 906 \ 907 develop(bool, PrintDebugInfo, false, \ 908 "Print debug information for all nmethods when generated") \ 909 \ 910 develop(bool, PrintRelocations, false, \ 911 "Print relocation information for all nmethods when generated") \ 912 \ 913 develop(bool, PrintDependencies, false, \ 914 "Print dependency information for all nmethods when generated") \ 915 \ 916 develop(bool, PrintExceptionHandlers, false, \ 917 "Print exception handler tables for all nmethods when generated") \ 918 \ 919 develop(bool, InterceptOSException, false, \ 920 "Starts debugger when an implicit OS (e.g., NULL) " \ 921 "exception happens") \ 922 \ 923 notproduct(bool, PrintCodeCache, false, \ 924 "Print the compiled_code cache when exiting") \ 925 \ 926 develop(bool, PrintCodeCache2, false, \ 927 "Print detailed info on the compiled_code cache when exiting") \ 928 \ 929 diagnostic(bool, PrintStubCode, false, \ 930 "Print generated stub code") \ 931 \ 932 product(bool, StackTraceInThrowable, true, \ 933 "Collect backtrace in throwable when exception happens") \ 934 \ 935 product(bool, OmitStackTraceInFastThrow, true, \ 936 "Omit backtraces for some 'hot' exceptions in optimized code") \ 937 \ 938 product(bool, ProfilerPrintByteCodeStatistics, false, \ 939 "Prints byte code statictics when dumping profiler output") \ 940 \ 941 product(bool, ProfilerRecordPC, false, \ 942 "Collects tick for each 16 byte interval of compiled code") \ 943 \ 944 product(bool, ProfileVM, false, \ 945 "Profiles ticks that fall within VM (either in the VM Thread " \ 946 "or VM code called through stubs)") \ 947 \ 948 product(bool, ProfileIntervals, false, \ 949 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 950 \ 951 notproduct(bool, ProfilerCheckIntervals, false, \ 952 "Collect and print info on spacing of profiler ticks") \ 953 \ 954 develop(bool, PrintJVMWarnings, false, \ 955 "Prints warnings for unimplemented JVM functions") \ 956 \ 957 product(bool, PrintWarnings, true, \ 958 "Prints JVM warnings to output stream") \ 959 \ 960 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 961 "Prints warnings for stalled SpinLocks") \ 962 \ 963 develop(bool, InitializeJavaLangSystem, true, \ 964 "Initialize java.lang.System - turn off for individual " \ 965 "method debugging") \ 966 \ 967 develop(bool, InitializeJavaLangString, true, \ 968 "Initialize java.lang.String - turn off for individual " \ 969 "method debugging") \ 970 \ 971 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 972 "Initialize various error and exception classes - turn off for " \ 973 "individual method debugging") \ 974 \ 975 product(bool, RegisterFinalizersAtInit, true, \ 976 "Register finalizable objects at end of Object.<init> or " \ 977 "after allocation") \ 978 \ 979 develop(bool, RegisterReferences, true, \ 980 "Tells whether the VM should register soft/weak/final/phantom " \ 981 "references") \ 982 \ 983 develop(bool, IgnoreRewrites, false, \ 984 "Supress rewrites of bytecodes in the oopmap generator. " \ 985 "This is unsafe!") \ 986 \ 987 develop(bool, PrintCodeCacheExtension, false, \ 988 "Print extension of code cache") \ 989 \ 990 develop(bool, UsePrivilegedStack, true, \ 991 "Enable the security JVM functions") \ 992 \ 993 develop(bool, IEEEPrecision, true, \ 994 "Enables IEEE precision (for INTEL only)") \ 995 \ 996 develop(bool, ProtectionDomainVerification, true, \ 997 "Verifies protection domain before resolution in system " \ 998 "dictionary") \ 999 \ 1000 product(bool, ClassUnloading, true, \ 1001 "Do unloading of classes") \ 1002 \ 1003 diagnostic(bool, LinkWellKnownClasses, false, \ 1004 "Resolve a well known class as soon as its name is seen") \ 1005 \ 1006 develop(bool, DisableStartThread, false, \ 1007 "Disable starting of additional Java threads " \ 1008 "(for debugging only)") \ 1009 \ 1010 develop(bool, MemProfiling, false, \ 1011 "Write memory usage profiling to log file") \ 1012 \ 1013 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1014 "Prints the system dictionary at exit") \ 1015 \ 1016 diagnostic(bool, UnsyncloadClass, false, \ 1017 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1018 "class loader must call VM synchronized for findClass " \ 1019 "and defineClass.") \ 1020 \ 1021 product(bool, AlwaysLockClassLoader, false, \ 1022 "Require the VM to acquire the class loader lock before calling " \ 1023 "loadClass() even for class loaders registering " \ 1024 "as parallel capable") \ 1025 \ 1026 product(bool, AllowParallelDefineClass, false, \ 1027 "Allow parallel defineClass requests for class loaders " \ 1028 "registering as parallel capable") \ 1029 \ 1030 product(bool, MustCallLoadClassInternal, false, \ 1031 "Call loadClassInternal() rather than loadClass()") \ 1032 \ 1033 product_pd(bool, DontYieldALot, \ 1034 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1035 \ 1036 product_pd(bool, ConvertSleepToYield, \ 1037 "Converts sleep(0) to thread yield " \ 1038 "(may be off for SOLARIS to improve GUI)") \ 1039 \ 1040 product(bool, ConvertYieldToSleep, false, \ 1041 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1042 "behavior (SOLARIS only)") \ 1043 \ 1044 product(bool, UseBoundThreads, true, \ 1045 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1046 \ 1047 develop(bool, UseDetachedThreads, true, \ 1048 "Use detached threads that are recycled upon termination " \ 1049 "(for SOLARIS only)") \ 1050 \ 1051 product(bool, UseLWPSynchronization, true, \ 1052 "Use LWP-based instead of libthread-based synchronization " \ 1053 "(SPARC only)") \ 1054 \ 1055 product(ccstr, SyncKnobs, NULL, \ 1056 "(Unstable) Various monitor synchronization tunables") \ 1057 \ 1058 product(intx, EmitSync, 0, \ 1059 "(Unsafe,Unstable) " \ 1060 " Controls emission of inline sync fast-path code") \ 1061 \ 1062 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1063 \ 1064 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1065 \ 1066 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1067 \ 1068 product(intx, Atomics, 0, \ 1069 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1070 \ 1071 product(intx, FenceInstruction, 0, \ 1072 "(Unsafe,Unstable) Experimental") \ 1073 \ 1074 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1075 \ 1076 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1077 \ 1078 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1079 \ 1080 product(intx, hashCode, 0, \ 1081 "(Unstable) select hashCode generation algorithm" ) \ 1082 \ 1083 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1084 "(Unstable, Linux-specific)" \ 1085 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1086 \ 1087 product(bool, FilterSpuriousWakeups, true, \ 1088 "Prevent spurious or premature wakeups from object.wait " \ 1089 "(Solaris only)") \ 1090 \ 1091 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1092 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1093 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1094 \ 1095 develop(bool, UsePthreads, false, \ 1096 "Use pthread-based instead of libthread-based synchronization " \ 1097 "(SPARC only)") \ 1098 \ 1099 product(bool, AdjustConcurrency, false, \ 1100 "call thr_setconcurrency at thread create time to avoid " \ 1101 "LWP starvation on MP systems (For Solaris Only)") \ 1102 \ 1103 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1104 "Should the system attempt to update the compiler file when " \ 1105 "an error occurs?") \ 1106 \ 1107 product(bool, ReduceSignalUsage, false, \ 1108 "Reduce the use of OS signals in Java and/or the VM") \ 1109 \ 1110 notproduct(bool, ValidateMarkSweep, false, \ 1111 "Do extra validation during MarkSweep collection") \ 1112 \ 1113 notproduct(bool, RecordMarkSweepCompaction, false, \ 1114 "Enable GC-to-GC recording and querying of compaction during " \ 1115 "MarkSweep") \ 1116 \ 1117 develop_pd(bool, ShareVtableStubs, \ 1118 "Share vtable stubs (smaller code but worse branch prediction") \ 1119 \ 1120 develop(bool, LoadLineNumberTables, true, \ 1121 "Tells whether the class file parser loads line number tables") \ 1122 \ 1123 develop(bool, LoadLocalVariableTables, true, \ 1124 "Tells whether the class file parser loads local variable tables")\ 1125 \ 1126 develop(bool, LoadLocalVariableTypeTables, true, \ 1127 "Tells whether the class file parser loads local variable type tables")\ 1128 \ 1129 product(bool, AllowUserSignalHandlers, false, \ 1130 "Do not complain if the application installs signal handlers " \ 1131 "(Solaris & Linux only)") \ 1132 \ 1133 product(bool, UseSignalChaining, true, \ 1134 "Use signal-chaining to invoke signal handlers installed " \ 1135 "by the application (Solaris & Linux only)") \ 1136 \ 1137 product(bool, UseAltSigs, false, \ 1138 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1139 "internal signals (Solaris only)") \ 1140 \ 1141 product(bool, UseSpinning, false, \ 1142 "Use spinning in monitor inflation and before entry") \ 1143 \ 1144 product(bool, PreSpinYield, false, \ 1145 "Yield before inner spinning loop") \ 1146 \ 1147 product(bool, PostSpinYield, true, \ 1148 "Yield after inner spinning loop") \ 1149 \ 1150 product(bool, AllowJNIEnvProxy, false, \ 1151 "Allow JNIEnv proxies for jdbx") \ 1152 \ 1153 product(bool, JNIDetachReleasesMonitors, true, \ 1154 "JNI DetachCurrentThread releases monitors owned by thread") \ 1155 \ 1156 product(bool, RestoreMXCSROnJNICalls, false, \ 1157 "Restore MXCSR when returning from JNI calls") \ 1158 \ 1159 product(bool, CheckJNICalls, false, \ 1160 "Verify all arguments to JNI calls") \ 1161 \ 1162 product(bool, UseFastJNIAccessors, true, \ 1163 "Use optimized versions of Get<Primitive>Field") \ 1164 \ 1165 product(bool, EagerXrunInit, false, \ 1166 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1167 " but not all -Xrun libraries may support the state of the VM at this time") \ 1168 \ 1169 product(bool, PreserveAllAnnotations, false, \ 1170 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1171 \ 1172 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1173 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1174 \ 1175 product(bool, LazyBootClassLoader, true, \ 1176 "Enable/disable lazy opening of boot class path entries") \ 1177 \ 1178 diagnostic(bool, UseIncDec, true, \ 1179 "Use INC, DEC instructions on x86") \ 1180 \ 1181 product(bool, UseNewLongLShift, false, \ 1182 "Use optimized bitwise shift left") \ 1183 \ 1184 product(bool, UseStoreImmI16, true, \ 1185 "Use store immediate 16-bits value instruction on x86") \ 1186 \ 1187 product(bool, UseAddressNop, false, \ 1188 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1189 \ 1190 product(bool, UseXmmLoadAndClearUpper, true, \ 1191 "Load low part of XMM register and clear upper part") \ 1192 \ 1193 product(bool, UseXmmRegToRegMoveAll, false, \ 1194 "Copy all XMM register bits when moving value between registers") \ 1195 \ 1196 product(bool, UseXmmI2D, false, \ 1197 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1198 \ 1199 product(bool, UseXmmI2F, false, \ 1200 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1201 \ 1202 product(bool, UseXMMForArrayCopy, false, \ 1203 "Use SSE2 MOVQ instruction for Arraycopy") \ 1204 \ 1205 product(bool, UseUnalignedLoadStores, false, \ 1206 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1207 \ 1208 product(bool, UseCBCond, false, \ 1209 "Use compare and branch instruction on SPARC") \ 1210 \ 1211 product(intx, FieldsAllocationStyle, 1, \ 1212 "0 - type based with oops first, 1 - with oops last, " \ 1213 "2 - oops in super and sub classes are together") \ 1214 \ 1215 product(bool, CompactFields, true, \ 1216 "Allocate nonstatic fields in gaps between previous fields") \ 1217 \ 1218 notproduct(bool, PrintCompactFieldsSavings, false, \ 1219 "Print how many words were saved with CompactFields") \ 1220 \ 1221 product(bool, UseBiasedLocking, true, \ 1222 "Enable biased locking in JVM") \ 1223 \ 1224 product(intx, BiasedLockingStartupDelay, 4000, \ 1225 "Number of milliseconds to wait before enabling biased locking") \ 1226 \ 1227 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1228 "Print statistics of biased locking in JVM") \ 1229 \ 1230 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1231 "Threshold of number of revocations per type to try to " \ 1232 "rebias all objects in the heap of that type") \ 1233 \ 1234 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1235 "Threshold of number of revocations per type to permanently " \ 1236 "revoke biases of all objects in the heap of that type") \ 1237 \ 1238 product(intx, BiasedLockingDecayTime, 25000, \ 1239 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1240 "type after previous bulk rebias") \ 1241 \ 1242 develop(bool, JavaObjectsInPerm, false, \ 1243 "controls whether Classes and interned Strings are allocated" \ 1244 "in perm. This purely intended to allow debugging issues" \ 1245 "in production.") \ 1246 \ 1247 /* tracing */ \ 1248 \ 1249 notproduct(bool, TraceRuntimeCalls, false, \ 1250 "Trace run-time calls") \ 1251 \ 1252 develop(bool, TraceJNICalls, false, \ 1253 "Trace JNI calls") \ 1254 \ 1255 notproduct(bool, TraceJVMCalls, false, \ 1256 "Trace JVM calls") \ 1257 \ 1258 product(ccstr, TraceJVMTI, NULL, \ 1259 "Trace flags for JVMTI functions and events") \ 1260 \ 1261 /* This option can change an EMCP method into an obsolete method. */ \ 1262 /* This can affect tests that except specific methods to be EMCP. */ \ 1263 /* This option should be used with caution. */ \ 1264 product(bool, StressLdcRewrite, false, \ 1265 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1266 \ 1267 product(intx, TraceRedefineClasses, 0, \ 1268 "Trace level for JVMTI RedefineClasses") \ 1269 \ 1270 develop(bool, StressMethodComparator, false, \ 1271 "run the MethodComparator on all loaded methods") \ 1272 \ 1273 /* change to false by default sometime after Mustang */ \ 1274 product(bool, VerifyMergedCPBytecodes, true, \ 1275 "Verify bytecodes after RedefineClasses constant pool merging") \ 1276 \ 1277 develop(bool, TraceJNIHandleAllocation, false, \ 1278 "Trace allocation/deallocation of JNI handle blocks") \ 1279 \ 1280 develop(bool, TraceThreadEvents, false, \ 1281 "Trace all thread events") \ 1282 \ 1283 develop(bool, TraceBytecodes, false, \ 1284 "Trace bytecode execution") \ 1285 \ 1286 develop(bool, TraceClassInitialization, false, \ 1287 "Trace class initialization") \ 1288 \ 1289 develop(bool, TraceExceptions, false, \ 1290 "Trace exceptions") \ 1291 \ 1292 develop(bool, TraceICs, false, \ 1293 "Trace inline cache changes") \ 1294 \ 1295 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1296 "Trace method invocation counter overflow") \ 1297 \ 1298 develop(bool, TraceInlineCacheClearing, false, \ 1299 "Trace clearing of inline caches in nmethods") \ 1300 \ 1301 develop(bool, TraceDependencies, false, \ 1302 "Trace dependencies") \ 1303 \ 1304 develop(bool, VerifyDependencies, trueInDebug, \ 1305 "Exercise and verify the compilation dependency mechanism") \ 1306 \ 1307 develop(bool, TraceNewOopMapGeneration, false, \ 1308 "Trace OopMapGeneration") \ 1309 \ 1310 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1311 "Trace OopMapGeneration: print detailed cell states") \ 1312 \ 1313 develop(bool, TimeOopMap, false, \ 1314 "Time calls to GenerateOopMap::compute_map() in sum") \ 1315 \ 1316 develop(bool, TimeOopMap2, false, \ 1317 "Time calls to GenerateOopMap::compute_map() individually") \ 1318 \ 1319 develop(bool, TraceMonitorMismatch, false, \ 1320 "Trace monitor matching failures during OopMapGeneration") \ 1321 \ 1322 develop(bool, TraceOopMapRewrites, false, \ 1323 "Trace rewritting of method oops during oop map generation") \ 1324 \ 1325 develop(bool, TraceSafepoint, false, \ 1326 "Trace safepoint operations") \ 1327 \ 1328 develop(bool, TraceICBuffer, false, \ 1329 "Trace usage of IC buffer") \ 1330 \ 1331 develop(bool, TraceCompiledIC, false, \ 1332 "Trace changes of compiled IC") \ 1333 \ 1334 notproduct(bool, TraceZapDeadLocals, false, \ 1335 "Trace zapping dead locals") \ 1336 \ 1337 develop(bool, TraceStartupTime, false, \ 1338 "Trace setup time") \ 1339 \ 1340 product(ccstr, HPILibPath, NULL, \ 1341 "Specify alternate path to HPI library") \ 1342 \ 1343 develop(bool, TraceProtectionDomainVerification, false, \ 1344 "Trace protection domain verifcation") \ 1345 \ 1346 develop(bool, TraceClearedExceptions, false, \ 1347 "Prints when an exception is forcibly cleared") \ 1348 \ 1349 product(bool, TraceClassResolution, false, \ 1350 "Trace all constant pool resolutions (for debugging)") \ 1351 \ 1352 product(bool, TraceBiasedLocking, false, \ 1353 "Trace biased locking in JVM") \ 1354 \ 1355 product(bool, TraceMonitorInflation, false, \ 1356 "Trace monitor inflation in JVM") \ 1357 \ 1358 /* assembler */ \ 1359 product(bool, Use486InstrsOnly, false, \ 1360 "Use 80486 Compliant instruction subset") \ 1361 \ 1362 /* gc */ \ 1363 \ 1364 product(bool, UseSerialGC, false, \ 1365 "Use the serial garbage collector") \ 1366 \ 1367 product(bool, UseG1GC, false, \ 1368 "Use the Garbage-First garbage collector") \ 1369 \ 1370 product(bool, UseParallelGC, false, \ 1371 "Use the Parallel Scavenge garbage collector") \ 1372 \ 1373 product(bool, UseParallelOldGC, false, \ 1374 "Use the Parallel Old garbage collector") \ 1375 \ 1376 product(uintx, HeapMaximumCompactionInterval, 20, \ 1377 "How often should we maximally compact the heap (not allowing " \ 1378 "any dead space)") \ 1379 \ 1380 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1381 "The collection count for the first maximum compaction") \ 1382 \ 1383 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1384 "In the Parallel Old garbage collector maximum compaction for " \ 1385 "a system GC") \ 1386 \ 1387 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1388 "The mean used by the par compact dead wood" \ 1389 "limiter (a number between 0-100).") \ 1390 \ 1391 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1392 "The standard deviation used by the par compact dead wood" \ 1393 "limiter (a number between 0-100).") \ 1394 \ 1395 product(uintx, ParallelGCThreads, 0, \ 1396 "Number of parallel threads parallel gc will use") \ 1397 \ 1398 develop(bool, ParallelOldGCSplitALot, false, \ 1399 "Provoke splitting (copying data from a young gen space to" \ 1400 "multiple destination spaces)") \ 1401 \ 1402 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1403 "How often to provoke splitting a young gen space") \ 1404 \ 1405 develop(bool, TraceRegionTasksQueuing, false, \ 1406 "Trace the queuing of the region tasks") \ 1407 \ 1408 product(uintx, ConcGCThreads, 0, \ 1409 "Number of threads concurrent gc will use") \ 1410 \ 1411 product(uintx, YoungPLABSize, 4096, \ 1412 "Size of young gen promotion labs (in HeapWords)") \ 1413 \ 1414 product(uintx, OldPLABSize, 1024, \ 1415 "Size of old gen promotion labs (in HeapWords)") \ 1416 \ 1417 product(uintx, GCTaskTimeStampEntries, 200, \ 1418 "Number of time stamp entries per gc worker thread") \ 1419 \ 1420 product(bool, AlwaysTenure, false, \ 1421 "Always tenure objects in eden. (ParallelGC only)") \ 1422 \ 1423 product(bool, NeverTenure, false, \ 1424 "Never tenure objects in eden, May tenure on overflow " \ 1425 "(ParallelGC only)") \ 1426 \ 1427 product(bool, ScavengeBeforeFullGC, true, \ 1428 "Scavenge youngest generation before each full GC, " \ 1429 "used with UseParallelGC") \ 1430 \ 1431 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1432 "Allow scavenges to occur when to_space contains objects.") \ 1433 \ 1434 product(bool, UseConcMarkSweepGC, false, \ 1435 "Use Concurrent Mark-Sweep GC in the old generation") \ 1436 \ 1437 product(bool, ExplicitGCInvokesConcurrent, false, \ 1438 "A System.gc() request invokes a concurrent collection;" \ 1439 " (effective only when UseConcMarkSweepGC)") \ 1440 \ 1441 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1442 "A System.gc() request invokes a concurrent collection and " \ 1443 "also unloads classes during such a concurrent gc cycle " \ 1444 "(effective only when UseConcMarkSweepGC)") \ 1445 \ 1446 product(bool, GCLockerInvokesConcurrent, false, \ 1447 "The exit of a JNI CS necessitating a scavenge also" \ 1448 " kicks off a bkgrd concurrent collection") \ 1449 \ 1450 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1451 "How much the GC can expand the eden by while the GC locker " \ 1452 "is active (as a percentage)") \ 1453 \ 1454 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1455 "Use Adaptive Free Lists in the CMS generation") \ 1456 \ 1457 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1458 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1459 \ 1460 develop(bool, RotateCMSCollectionTypes, false, \ 1461 "Rotate the CMS collections among concurrent and STW") \ 1462 \ 1463 product(bool, UseCMSBestFit, true, \ 1464 "Use CMS best fit allocation strategy") \ 1465 \ 1466 product(bool, UseCMSCollectionPassing, true, \ 1467 "Use passing of collection from background to foreground") \ 1468 \ 1469 product(bool, UseParNewGC, false, \ 1470 "Use parallel threads in the new generation.") \ 1471 \ 1472 product(bool, ParallelGCVerbose, false, \ 1473 "Verbose output for parallel GC.") \ 1474 \ 1475 product(intx, ParallelGCBufferWastePct, 10, \ 1476 "wasted fraction of parallel allocation buffer.") \ 1477 \ 1478 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1479 "Retain parallel allocation buffers across scavenges; " \ 1480 " -- disabled because this currently conflicts with " \ 1481 " parallel card scanning under certain conditions ") \ 1482 \ 1483 product(intx, TargetPLABWastePct, 10, \ 1484 "target wasted space in last buffer as pct of overall allocation")\ 1485 \ 1486 product(uintx, PLABWeight, 75, \ 1487 "Percentage (0-100) used to weight the current sample when" \ 1488 "computing exponentially decaying average for ResizePLAB.") \ 1489 \ 1490 product(bool, ResizePLAB, true, \ 1491 "Dynamically resize (survivor space) promotion labs") \ 1492 \ 1493 product(bool, PrintPLAB, false, \ 1494 "Print (survivor space) promotion labs sizing decisions") \ 1495 \ 1496 product(intx, ParGCArrayScanChunk, 50, \ 1497 "Scan a subset and push remainder, if array is bigger than this") \ 1498 \ 1499 product(bool, ParGCUseLocalOverflow, false, \ 1500 "Instead of a global overflow list, use local overflow stacks") \ 1501 \ 1502 product(bool, ParGCTrimOverflow, true, \ 1503 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1504 \ 1505 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1506 "Whether we should simulate work queue overflow in ParNew") \ 1507 \ 1508 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1509 "An `interval' counter that determines how frequently " \ 1510 "we simulate overflow; a smaller number increases frequency") \ 1511 \ 1512 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1513 "The desired number of objects to claim from the overflow list") \ 1514 \ 1515 diagnostic(intx, ParGCStridesPerThread, 2, \ 1516 "The number of strides per worker thread that we divide up the " \ 1517 "card table scanning work into") \ 1518 \ 1519 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1520 "The number of cards in each chunk of the parallel chunks used " \ 1521 "during card table scanning") \ 1522 \ 1523 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1524 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1525 "parallel GC.") \ 1526 \ 1527 product(uintx, OldPLABWeight, 50, \ 1528 "Percentage (0-100) used to weight the current sample when" \ 1529 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1530 \ 1531 product(bool, ResizeOldPLAB, true, \ 1532 "Dynamically resize (old gen) promotion labs") \ 1533 \ 1534 product(bool, PrintOldPLAB, false, \ 1535 "Print (old gen) promotion labs sizing decisions") \ 1536 \ 1537 product(uintx, CMSOldPLABMin, 16, \ 1538 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1539 \ 1540 product(uintx, CMSOldPLABMax, 1024, \ 1541 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1542 \ 1543 product(uintx, CMSOldPLABNumRefills, 4, \ 1544 "Nominal number of refills of CMS gen promotion lab cache" \ 1545 " per worker per block size") \ 1546 \ 1547 product(bool, CMSOldPLABResizeQuicker, false, \ 1548 "Whether to react on-the-fly during a scavenge to a sudden" \ 1549 " change in block demand rate") \ 1550 \ 1551 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1552 "The tolerance of the phase-change detector for on-the-fly" \ 1553 " PLAB resizing during a scavenge") \ 1554 \ 1555 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1556 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1557 " during a scavenge") \ 1558 \ 1559 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1560 "The clamping of the gain in the feedback loop for on-the-fly" \ 1561 " PLAB resizing during a scavenge") \ 1562 \ 1563 product(bool, AlwaysPreTouch, false, \ 1564 "It forces all freshly committed pages to be pre-touched.") \ 1565 \ 1566 product_pd(intx, CMSYoungGenPerWorker, \ 1567 "The maximum size of young gen chosen by default per GC worker " \ 1568 "thread available") \ 1569 \ 1570 product(bool, GCOverheadReporting, false, \ 1571 "Enables the GC overhead reporting facility") \ 1572 \ 1573 product(intx, GCOverheadReportingPeriodMS, 100, \ 1574 "Reporting period for conc GC overhead reporting, in ms ") \ 1575 \ 1576 product(bool, CMSIncrementalMode, false, \ 1577 "Whether CMS GC should operate in \"incremental\" mode") \ 1578 \ 1579 product(uintx, CMSIncrementalDutyCycle, 10, \ 1580 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1581 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1582 "value") \ 1583 \ 1584 product(bool, CMSIncrementalPacing, true, \ 1585 "Whether the CMS incremental mode duty cycle should be " \ 1586 "automatically adjusted") \ 1587 \ 1588 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1589 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1590 "enabled (a percentage, 0-100)") \ 1591 \ 1592 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1593 "Percentage (0-100) used to add conservatism when computing the " \ 1594 "duty cycle") \ 1595 \ 1596 product(uintx, CMSIncrementalOffset, 0, \ 1597 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1598 " is shifted to the right within the period between young GCs") \ 1599 \ 1600 product(uintx, CMSExpAvgFactor, 50, \ 1601 "Percentage (0-100) used to weight the current sample when" \ 1602 "computing exponential averages for CMS statistics.") \ 1603 \ 1604 product(uintx, CMS_FLSWeight, 75, \ 1605 "Percentage (0-100) used to weight the current sample when" \ 1606 "computing exponentially decating averages for CMS FLS statistics.") \ 1607 \ 1608 product(uintx, CMS_FLSPadding, 1, \ 1609 "The multiple of deviation from mean to use for buffering" \ 1610 "against volatility in free list demand.") \ 1611 \ 1612 product(uintx, FLSCoalescePolicy, 2, \ 1613 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1614 \ 1615 product(bool, FLSAlwaysCoalesceLarge, false, \ 1616 "CMS: Larger free blocks are always available for coalescing") \ 1617 \ 1618 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1619 "CMS: the smaller the percentage the greater the coalition force")\ 1620 \ 1621 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1622 "CMS: the factor by which to inflate estimated demand of small" \ 1623 " block sizes to prevent coalescing with an adjoining block") \ 1624 \ 1625 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1626 "CMS: the factor by which to inflate estimated demand of large" \ 1627 " block sizes to prevent coalescing with an adjoining block") \ 1628 \ 1629 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1630 "CMS: the factor by which to inflate estimated demand of small" \ 1631 " block sizes to prevent splitting to supply demand for smaller" \ 1632 " blocks") \ 1633 \ 1634 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1635 "CMS: the factor by which to inflate estimated demand of large" \ 1636 " block sizes to prevent splitting to supply demand for smaller" \ 1637 " blocks") \ 1638 \ 1639 product(bool, CMSExtrapolateSweep, false, \ 1640 "CMS: cushion for block demand during sweep") \ 1641 \ 1642 product(uintx, CMS_SweepWeight, 75, \ 1643 "Percentage (0-100) used to weight the current sample when " \ 1644 "computing exponentially decaying average for inter-sweep " \ 1645 "duration") \ 1646 \ 1647 product(uintx, CMS_SweepPadding, 1, \ 1648 "The multiple of deviation from mean to use for buffering " \ 1649 "against volatility in inter-sweep duration.") \ 1650 \ 1651 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1652 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1653 "duration exceeds this threhold in milliseconds") \ 1654 \ 1655 develop(bool, CMSTraceIncrementalMode, false, \ 1656 "Trace CMS incremental mode") \ 1657 \ 1658 develop(bool, CMSTraceIncrementalPacing, false, \ 1659 "Trace CMS incremental mode pacing computation") \ 1660 \ 1661 develop(bool, CMSTraceThreadState, false, \ 1662 "Trace the CMS thread state (enable the trace_state() method)") \ 1663 \ 1664 product(bool, CMSClassUnloadingEnabled, false, \ 1665 "Whether class unloading enabled when using CMS GC") \ 1666 \ 1667 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1668 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1669 " for which classes may not be unloaded") \ 1670 \ 1671 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1672 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1673 \ 1674 product(bool, UseCMSCompactAtFullCollection, true, \ 1675 "Use mark sweep compact at full collections") \ 1676 \ 1677 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1678 "Number of CMS full collection done before compaction if > 0") \ 1679 \ 1680 develop(intx, CMSDictionaryChoice, 0, \ 1681 "Use BinaryTreeDictionary as default in the CMS generation") \ 1682 \ 1683 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1684 "Replenish an indexed free list with this number of chunks") \ 1685 \ 1686 product(bool, CMSReplenishIntermediate, true, \ 1687 "Replenish all intermediate free-list caches") \ 1688 \ 1689 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1690 "When satisfying batched demand, split blocks from the " \ 1691 "IndexedFreeList whose size is a multiple of requested size") \ 1692 \ 1693 product(bool, CMSLoopWarn, false, \ 1694 "Warn in case of excessive CMS looping") \ 1695 \ 1696 develop(bool, CMSOverflowEarlyRestoration, false, \ 1697 "Whether preserved marks should be restored early") \ 1698 \ 1699 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1700 "Size of marking stack") \ 1701 \ 1702 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1703 "Max size of marking stack") \ 1704 \ 1705 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1706 "Whether we should simulate frequent marking stack / work queue" \ 1707 " overflow") \ 1708 \ 1709 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1710 "An `interval' counter that determines how frequently" \ 1711 " we simulate overflow; a smaller number increases frequency") \ 1712 \ 1713 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1714 "(Temporary, subject to experimentation)" \ 1715 "Maximum number of abortable preclean iterations, if > 0") \ 1716 \ 1717 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1718 "(Temporary, subject to experimentation)" \ 1719 "Maximum time in abortable preclean in ms") \ 1720 \ 1721 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1722 "(Temporary, subject to experimentation)" \ 1723 "Nominal minimum work per abortable preclean iteration") \ 1724 \ 1725 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1726 "(Temporary, subject to experimentation)" \ 1727 " Time that we sleep between iterations when not given" \ 1728 " enough work per iteration") \ 1729 \ 1730 product(uintx, CMSRescanMultiple, 32, \ 1731 "Size (in cards) of CMS parallel rescan task") \ 1732 \ 1733 product(uintx, CMSConcMarkMultiple, 32, \ 1734 "Size (in cards) of CMS concurrent MT marking task") \ 1735 \ 1736 product(uintx, CMSRevisitStackSize, 1*M, \ 1737 "Size of CMS KlassKlass revisit stack") \ 1738 \ 1739 product(bool, CMSAbortSemantics, false, \ 1740 "Whether abort-on-overflow semantics is implemented") \ 1741 \ 1742 product(bool, CMSParallelRemarkEnabled, true, \ 1743 "Whether parallel remark enabled (only if ParNewGC)") \ 1744 \ 1745 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1746 "Whether parallel remark of survivor space" \ 1747 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1748 \ 1749 product(bool, CMSPLABRecordAlways, true, \ 1750 "Whether to always record survivor space PLAB bdries" \ 1751 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1752 \ 1753 product(bool, CMSConcurrentMTEnabled, true, \ 1754 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1755 \ 1756 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1757 "Whether concurrent precleaning enabled in perm gen" \ 1758 " (effective only when CMSPrecleaningEnabled is true)") \ 1759 \ 1760 product(bool, CMSPrecleaningEnabled, true, \ 1761 "Whether concurrent precleaning enabled") \ 1762 \ 1763 product(uintx, CMSPrecleanIter, 3, \ 1764 "Maximum number of precleaning iteration passes") \ 1765 \ 1766 product(uintx, CMSPrecleanNumerator, 2, \ 1767 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1768 " ratio") \ 1769 \ 1770 product(uintx, CMSPrecleanDenominator, 3, \ 1771 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1772 " ratio") \ 1773 \ 1774 product(bool, CMSPrecleanRefLists1, true, \ 1775 "Preclean ref lists during (initial) preclean phase") \ 1776 \ 1777 product(bool, CMSPrecleanRefLists2, false, \ 1778 "Preclean ref lists during abortable preclean phase") \ 1779 \ 1780 product(bool, CMSPrecleanSurvivors1, false, \ 1781 "Preclean survivors during (initial) preclean phase") \ 1782 \ 1783 product(bool, CMSPrecleanSurvivors2, true, \ 1784 "Preclean survivors during abortable preclean phase") \ 1785 \ 1786 product(uintx, CMSPrecleanThreshold, 1000, \ 1787 "Don't re-iterate if #dirty cards less than this") \ 1788 \ 1789 product(bool, CMSCleanOnEnter, true, \ 1790 "Clean-on-enter optimization for reducing number of dirty cards") \ 1791 \ 1792 product(uintx, CMSRemarkVerifyVariant, 1, \ 1793 "Choose variant (1,2) of verification following remark") \ 1794 \ 1795 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1796 "If Eden used is below this value, don't try to schedule remark") \ 1797 \ 1798 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1799 "The Eden occupancy % at which to try and schedule remark pause") \ 1800 \ 1801 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1802 "Start sampling Eden top at least before yg occupancy reaches" \ 1803 " 1/<ratio> of the size at which we plan to schedule remark") \ 1804 \ 1805 product(uintx, CMSSamplingGrain, 16*K, \ 1806 "The minimum distance between eden samples for CMS (see above)") \ 1807 \ 1808 product(bool, CMSScavengeBeforeRemark, false, \ 1809 "Attempt scavenge before the CMS remark step") \ 1810 \ 1811 develop(bool, CMSTraceSweeper, false, \ 1812 "Trace some actions of the CMS sweeper") \ 1813 \ 1814 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1815 "Don't drain below this size per parallel worker/thief") \ 1816 \ 1817 manageable(intx, CMSWaitDuration, 2000, \ 1818 "Time in milliseconds that CMS thread waits for young GC") \ 1819 \ 1820 product(bool, CMSYield, true, \ 1821 "Yield between steps of concurrent mark & sweep") \ 1822 \ 1823 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1824 "Bitmap operations should process at most this many bits" \ 1825 "between yields") \ 1826 \ 1827 product(bool, CMSDumpAtPromotionFailure, false, \ 1828 "Dump useful information about the state of the CMS old " \ 1829 " generation upon a promotion failure.") \ 1830 \ 1831 product(bool, CMSPrintChunksInDump, false, \ 1832 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1833 " more detailed information about the free chunks.") \ 1834 \ 1835 product(bool, CMSPrintObjectsInDump, false, \ 1836 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1837 " more detailed information about the allocated objects.") \ 1838 \ 1839 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1840 "Verify that all refs across the FLS boundary " \ 1841 " are to valid objects") \ 1842 \ 1843 diagnostic(bool, FLSVerifyLists, false, \ 1844 "Do lots of (expensive) FreeListSpace verification") \ 1845 \ 1846 diagnostic(bool, FLSVerifyIndexTable, false, \ 1847 "Do lots of (expensive) FLS index table verification") \ 1848 \ 1849 develop(bool, FLSVerifyDictionary, false, \ 1850 "Do lots of (expensive) FLS dictionary verification") \ 1851 \ 1852 develop(bool, VerifyBlockOffsetArray, false, \ 1853 "Do (expensive!) block offset array verification") \ 1854 \ 1855 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1856 "Maintain _unallocated_block in BlockOffsetArray" \ 1857 " (currently applicable only to CMS collector)") \ 1858 \ 1859 develop(bool, TraceCMSState, false, \ 1860 "Trace the state of the CMS collection") \ 1861 \ 1862 product(intx, RefDiscoveryPolicy, 0, \ 1863 "Whether reference-based(0) or referent-based(1)") \ 1864 \ 1865 product(bool, ParallelRefProcEnabled, false, \ 1866 "Enable parallel reference processing whenever possible") \ 1867 \ 1868 product(bool, ParallelRefProcBalancingEnabled, true, \ 1869 "Enable balancing of reference processing queues") \ 1870 \ 1871 product(intx, CMSTriggerRatio, 80, \ 1872 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1873 "allocated before a CMS collection cycle commences") \ 1874 \ 1875 product(intx, CMSTriggerPermRatio, 80, \ 1876 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1877 "is allocated before a CMS collection cycle commences, that " \ 1878 "also collects the perm generation") \ 1879 \ 1880 product(uintx, CMSBootstrapOccupancy, 50, \ 1881 "Percentage CMS generation occupancy at which to " \ 1882 "initiate CMS collection for bootstrapping collection stats") \ 1883 \ 1884 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1885 "Percentage CMS generation occupancy to start a CMS collection " \ 1886 "cycle. A negative value means that CMSTriggerRatio is used") \ 1887 \ 1888 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1889 "Percentage of the (entire) heap occupancy to start a " \ 1890 "concurrent GC cycle. It us used by GCs that trigger a " \ 1891 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1892 "not just one of the generations (e.g., G1). A value of 0 " \ 1893 "denotes 'do constant GC cycles'.") \ 1894 \ 1895 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1896 "Percentage CMS perm generation occupancy to start a " \ 1897 "CMScollection cycle. A negative value means that " \ 1898 "CMSTriggerPermRatio is used") \ 1899 \ 1900 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1901 "Only use occupancy as a crierion for starting a CMS collection") \ 1902 \ 1903 product(intx, CMSIsTooFullPercentage, 98, \ 1904 "An absolute ceiling above which CMS will always consider the " \ 1905 "perm gen ripe for collection") \ 1906 \ 1907 develop(bool, CMSTestInFreeList, false, \ 1908 "Check if the coalesced range is already in the " \ 1909 "free lists as claimed") \ 1910 \ 1911 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1912 "Check that all the garbage collected was returned to the " \ 1913 "free lists.") \ 1914 \ 1915 notproduct(bool, ScavengeALot, false, \ 1916 "Force scavenge at every Nth exit from the runtime system " \ 1917 "(N=ScavengeALotInterval)") \ 1918 \ 1919 develop(bool, FullGCALot, false, \ 1920 "Force full gc at every Nth exit from the runtime system " \ 1921 "(N=FullGCALotInterval)") \ 1922 \ 1923 notproduct(bool, GCALotAtAllSafepoints, false, \ 1924 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1925 \ 1926 product(bool, PrintPromotionFailure, false, \ 1927 "Print additional diagnostic information following " \ 1928 " promotion failure") \ 1929 \ 1930 notproduct(bool, PromotionFailureALot, false, \ 1931 "Use promotion failure handling on every youngest generation " \ 1932 "collection") \ 1933 \ 1934 develop(uintx, PromotionFailureALotCount, 1000, \ 1935 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1936 "refill attempts (ParNew) or promotion attempts " \ 1937 "(other young collectors) ") \ 1938 \ 1939 develop(uintx, PromotionFailureALotInterval, 5, \ 1940 "Total collections between promotion failures alot") \ 1941 \ 1942 experimental(intx, WorkStealingSleepMillis, 1, \ 1943 "Sleep time when sleep is used for yields") \ 1944 \ 1945 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1946 "Number of yields before a sleep is done during workstealing") \ 1947 \ 1948 experimental(uintx, WorkStealingHardSpins, 4096, \ 1949 "Number of iterations in a spin loop between checks on " \ 1950 "time out of hard spin") \ 1951 \ 1952 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1953 "Ratio of hard spins to calls to yield") \ 1954 \ 1955 product(uintx, PreserveMarkStackSize, 1024, \ 1956 "Size for stack used in promotion failure handling") \ 1957 \ 1958 develop(uintx, ObjArrayMarkingStride, 512, \ 1959 "Number of ObjArray elements to push onto the marking stack" \ 1960 "before pushing a continuation entry") \ 1961 \ 1962 notproduct(bool, ExecuteInternalVMTests, false, \ 1963 "Enable execution of internal VM tests.") \ 1964 \ 1965 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1966 \ 1967 product_pd(bool, ResizeTLAB, \ 1968 "Dynamically resize tlab size for threads") \ 1969 \ 1970 product(bool, ZeroTLAB, false, \ 1971 "Zero out the newly created TLAB") \ 1972 \ 1973 product(bool, FastTLABRefill, true, \ 1974 "Use fast TLAB refill code") \ 1975 \ 1976 product(bool, PrintTLAB, false, \ 1977 "Print various TLAB related information") \ 1978 \ 1979 product(bool, TLABStats, true, \ 1980 "Print various TLAB related information") \ 1981 \ 1982 product(bool, PrintRevisitStats, false, \ 1983 "Print revisit (klass and MDO) stack related information") \ 1984 \ 1985 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 1986 "Enable LowMemoryProtection")) \ 1987 \ 1988 product_pd(bool, NeverActAsServerClassMachine, \ 1989 "Never act like a server-class machine") \ 1990 \ 1991 product(bool, AlwaysActAsServerClassMachine, false, \ 1992 "Always act like a server-class machine") \ 1993 \ 1994 product_pd(uint64_t, MaxRAM, \ 1995 "Real memory size (in bytes) used to set maximum heap size") \ 1996 \ 1997 product(uintx, ErgoHeapSizeLimit, 0, \ 1998 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1999 "MaxRAM / MaxRAMFraction") \ 2000 \ 2001 product(uintx, MaxRAMFraction, 4, \ 2002 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2003 "size") \ 2004 \ 2005 product(uintx, DefaultMaxRAMFraction, 4, \ 2006 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2007 "size; deprecated: to be renamed to MaxRAMFraction") \ 2008 \ 2009 product(uintx, MinRAMFraction, 2, \ 2010 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2011 "size on systems with small physical memory size") \ 2012 \ 2013 product(uintx, InitialRAMFraction, 64, \ 2014 "Fraction (1/n) of real memory used for initial heap size") \ 2015 \ 2016 product(bool, UseAutoGCSelectPolicy, false, \ 2017 "Use automatic collection selection policy") \ 2018 \ 2019 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2020 "Automatic GC selection pause threshhold in ms") \ 2021 \ 2022 product(bool, UseAdaptiveSizePolicy, true, \ 2023 "Use adaptive generation sizing policies") \ 2024 \ 2025 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2026 "Use adaptive survivor sizing policies") \ 2027 \ 2028 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2029 "Use adaptive young-old sizing policies at minor collections") \ 2030 \ 2031 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2032 "Use adaptive young-old sizing policies at major collections") \ 2033 \ 2034 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2035 "Use statistics from System.GC for adaptive size policy") \ 2036 \ 2037 product(bool, UseAdaptiveGCBoundary, false, \ 2038 "Allow young-old boundary to move") \ 2039 \ 2040 develop(bool, TraceAdaptiveGCBoundary, false, \ 2041 "Trace young-old boundary moves") \ 2042 \ 2043 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2044 "Resize the virtual spaces of the young or old generations") \ 2045 \ 2046 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2047 "Policy for changeing generation size for throughput goals") \ 2048 \ 2049 product(uintx, AdaptiveSizePausePolicy, 0, \ 2050 "Policy for changing generation size for pause goals") \ 2051 \ 2052 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2053 "Adjust tenured generation to achive a minor pause goal") \ 2054 \ 2055 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2056 "Adjust young generation to achive a major pause goal") \ 2057 \ 2058 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2059 "Number of steps where heuristics is used before data is used") \ 2060 \ 2061 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2062 "Number of collections before the adaptive sizing is started") \ 2063 \ 2064 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2065 "Collecton interval for printing information; zero => never") \ 2066 \ 2067 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2068 "Use adaptive minimum footprint as a goal") \ 2069 \ 2070 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2071 "Weight given to exponential resizing, between 0 and 100") \ 2072 \ 2073 product(uintx, AdaptiveTimeWeight, 25, \ 2074 "Weight given to time in adaptive policy, between 0 and 100") \ 2075 \ 2076 product(uintx, PausePadding, 1, \ 2077 "How much buffer to keep for pause time") \ 2078 \ 2079 product(uintx, PromotedPadding, 3, \ 2080 "How much buffer to keep for promotion failure") \ 2081 \ 2082 product(uintx, SurvivorPadding, 3, \ 2083 "How much buffer to keep for survivor overflow") \ 2084 \ 2085 product(uintx, AdaptivePermSizeWeight, 20, \ 2086 "Weight for perm gen exponential resizing, between 0 and 100") \ 2087 \ 2088 product(uintx, PermGenPadding, 3, \ 2089 "How much buffer to keep for perm gen sizing") \ 2090 \ 2091 product(uintx, ThresholdTolerance, 10, \ 2092 "Allowed collection cost difference between generations") \ 2093 \ 2094 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2095 "If collection costs are within margin, reduce both by full " \ 2096 "delta") \ 2097 \ 2098 product(uintx, YoungGenerationSizeIncrement, 20, \ 2099 "Adaptive size percentage change in young generation") \ 2100 \ 2101 product(uintx, YoungGenerationSizeSupplement, 80, \ 2102 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2103 \ 2104 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2105 "Decay factor to YoungedGenerationSizeSupplement") \ 2106 \ 2107 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2108 "Adaptive size percentage change in tenured generation") \ 2109 \ 2110 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2111 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2112 \ 2113 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2114 "Decay factor to TenuredGenerationSizeIncrement") \ 2115 \ 2116 product(uintx, MaxGCPauseMillis, max_uintx, \ 2117 "Adaptive size policy maximum GC pause time goal in msec, " \ 2118 "or (G1 Only) the max. GC time per MMU time slice") \ 2119 \ 2120 product(uintx, GCPauseIntervalMillis, 0, \ 2121 "Time slice for MMU specification") \ 2122 \ 2123 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2124 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2125 \ 2126 product(uintx, GCTimeRatio, 99, \ 2127 "Adaptive size policy application time to GC time ratio") \ 2128 \ 2129 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2130 "Adaptive size scale down factor for shrinking") \ 2131 \ 2132 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2133 "Adaptive size decays the major cost for long major intervals") \ 2134 \ 2135 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2136 "Time scale over which major costs decay") \ 2137 \ 2138 product(uintx, MinSurvivorRatio, 3, \ 2139 "Minimum ratio of young generation/survivor space size") \ 2140 \ 2141 product(uintx, InitialSurvivorRatio, 8, \ 2142 "Initial ratio of eden/survivor space size") \ 2143 \ 2144 product(uintx, BaseFootPrintEstimate, 256*M, \ 2145 "Estimate of footprint other than Java Heap") \ 2146 \ 2147 product(bool, UseGCOverheadLimit, true, \ 2148 "Use policy to limit of proportion of time spent in GC " \ 2149 "before an OutOfMemory error is thrown") \ 2150 \ 2151 product(uintx, GCTimeLimit, 98, \ 2152 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2153 "error is thrown (used with GCHeapFreeLimit)") \ 2154 \ 2155 product(uintx, GCHeapFreeLimit, 2, \ 2156 "Minimum percentage of free space after a full GC before an " \ 2157 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2158 \ 2159 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2160 "Number of consecutive collections before gc time limit fires") \ 2161 \ 2162 product(bool, PrintAdaptiveSizePolicy, false, \ 2163 "Print information about AdaptiveSizePolicy") \ 2164 \ 2165 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2166 "How far ahead to prefetch destination area (<= 0 means off)") \ 2167 \ 2168 product(intx, PrefetchScanIntervalInBytes, -1, \ 2169 "How far ahead to prefetch scan area (<= 0 means off)") \ 2170 \ 2171 product(intx, PrefetchFieldsAhead, -1, \ 2172 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2173 \ 2174 develop(bool, UsePrefetchQueue, true, \ 2175 "Use the prefetch queue during PS promotion") \ 2176 \ 2177 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2178 "Verify system before exiting") \ 2179 \ 2180 diagnostic(bool, VerifyBeforeGC, false, \ 2181 "Verify memory system before GC") \ 2182 \ 2183 diagnostic(bool, VerifyAfterGC, false, \ 2184 "Verify memory system after GC") \ 2185 \ 2186 diagnostic(bool, VerifyDuringGC, false, \ 2187 "Verify memory system during GC (between phases)") \ 2188 \ 2189 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2190 "Enable parallel memory system verification") \ 2191 \ 2192 diagnostic(bool, DeferInitialCardMark, false, \ 2193 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2194 "may arise from new_pre_store_barrier") \ 2195 \ 2196 diagnostic(bool, VerifyRememberedSets, false, \ 2197 "Verify GC remembered sets") \ 2198 \ 2199 diagnostic(bool, VerifyObjectStartArray, true, \ 2200 "Verify GC object start array if verify before/after") \ 2201 \ 2202 product(bool, DisableExplicitGC, false, \ 2203 "Tells whether calling System.gc() does a full GC") \ 2204 \ 2205 notproduct(bool, CheckMemoryInitialization, false, \ 2206 "Checks memory initialization") \ 2207 \ 2208 product(bool, CollectGen0First, false, \ 2209 "Collect youngest generation before each full GC") \ 2210 \ 2211 diagnostic(bool, BindCMSThreadToCPU, false, \ 2212 "Bind CMS Thread to CPU if possible") \ 2213 \ 2214 diagnostic(uintx, CPUForCMSThread, 0, \ 2215 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2216 \ 2217 product(bool, BindGCTaskThreadsToCPUs, false, \ 2218 "Bind GCTaskThreads to CPUs if possible") \ 2219 \ 2220 product(bool, UseGCTaskAffinity, false, \ 2221 "Use worker affinity when asking for GCTasks") \ 2222 \ 2223 product(uintx, ProcessDistributionStride, 4, \ 2224 "Stride through processors when distributing processes") \ 2225 \ 2226 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2227 "number of times the coordinator GC thread will sleep while " \ 2228 "yielding before giving up and resuming GC") \ 2229 \ 2230 product(uintx, CMSYieldSleepCount, 0, \ 2231 "number of times a GC thread (minus the coordinator) " \ 2232 "will sleep while yielding before giving up and resuming GC") \ 2233 \ 2234 /* gc tracing */ \ 2235 manageable(bool, PrintGC, false, \ 2236 "Print message at garbage collect") \ 2237 \ 2238 manageable(bool, PrintGCDetails, false, \ 2239 "Print more details at garbage collect") \ 2240 \ 2241 manageable(bool, PrintGCDateStamps, false, \ 2242 "Print date stamps at garbage collect") \ 2243 \ 2244 manageable(bool, PrintGCTimeStamps, false, \ 2245 "Print timestamps at garbage collect") \ 2246 \ 2247 product(bool, PrintGCTaskTimeStamps, false, \ 2248 "Print timestamps for individual gc worker thread tasks") \ 2249 \ 2250 develop(intx, ConcGCYieldTimeout, 0, \ 2251 "If non-zero, assert that GC threads yield within this # of ms.") \ 2252 \ 2253 notproduct(bool, TraceMarkSweep, false, \ 2254 "Trace mark sweep") \ 2255 \ 2256 product(bool, PrintReferenceGC, false, \ 2257 "Print times spent handling reference objects during GC " \ 2258 " (enabled only when PrintGCDetails)") \ 2259 \ 2260 develop(bool, TraceReferenceGC, false, \ 2261 "Trace handling of soft/weak/final/phantom references") \ 2262 \ 2263 develop(bool, TraceFinalizerRegistration, false, \ 2264 "Trace registration of final references") \ 2265 \ 2266 notproduct(bool, TraceScavenge, false, \ 2267 "Trace scavenge") \ 2268 \ 2269 product_rw(bool, TraceClassLoading, false, \ 2270 "Trace all classes loaded") \ 2271 \ 2272 product(bool, TraceClassLoadingPreorder, false, \ 2273 "Trace all classes loaded in order referenced (not loaded)") \ 2274 \ 2275 product_rw(bool, TraceClassUnloading, false, \ 2276 "Trace unloading of classes") \ 2277 \ 2278 product_rw(bool, TraceLoaderConstraints, false, \ 2279 "Trace loader constraints") \ 2280 \ 2281 product(bool, TraceGen0Time, false, \ 2282 "Trace accumulated time for Gen 0 collection") \ 2283 \ 2284 product(bool, TraceGen1Time, false, \ 2285 "Trace accumulated time for Gen 1 collection") \ 2286 \ 2287 product(bool, PrintTenuringDistribution, false, \ 2288 "Print tenuring age information") \ 2289 \ 2290 product_rw(bool, PrintHeapAtGC, false, \ 2291 "Print heap layout before and after each GC") \ 2292 \ 2293 product_rw(bool, PrintHeapAtGCExtended, false, \ 2294 "Prints extended information about the layout of the heap " \ 2295 "when -XX:+PrintHeapAtGC is set") \ 2296 \ 2297 product(bool, PrintHeapAtSIGBREAK, true, \ 2298 "Print heap layout in response to SIGBREAK") \ 2299 \ 2300 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2301 "Print a class histogram before any major stop-world GC") \ 2302 \ 2303 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2304 "Print a class histogram after any major stop-world GC") \ 2305 \ 2306 manageable(bool, PrintClassHistogram, false, \ 2307 "Print a histogram of class instances") \ 2308 \ 2309 develop(bool, TraceWorkGang, false, \ 2310 "Trace activities of work gangs") \ 2311 \ 2312 product(bool, TraceParallelOldGCTasks, false, \ 2313 "Trace multithreaded GC activity") \ 2314 \ 2315 develop(bool, TraceBlockOffsetTable, false, \ 2316 "Print BlockOffsetTable maps") \ 2317 \ 2318 develop(bool, TraceCardTableModRefBS, false, \ 2319 "Print CardTableModRefBS maps") \ 2320 \ 2321 develop(bool, TraceGCTaskManager, false, \ 2322 "Trace actions of the GC task manager") \ 2323 \ 2324 develop(bool, TraceGCTaskQueue, false, \ 2325 "Trace actions of the GC task queues") \ 2326 \ 2327 develop(bool, TraceGCTaskThread, false, \ 2328 "Trace actions of the GC task threads") \ 2329 \ 2330 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2331 "Print the time taken by each parallel old gc phase." \ 2332 "PrintGCDetails must also be enabled.") \ 2333 \ 2334 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2335 "Trace parallel old gc marking phase") \ 2336 \ 2337 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2338 "Trace parallel old gc summary phase") \ 2339 \ 2340 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2341 "Trace parallel old gc compaction phase") \ 2342 \ 2343 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2344 "Trace parallel old gc dense prefix computation") \ 2345 \ 2346 develop(bool, IgnoreLibthreadGPFault, false, \ 2347 "Suppress workaround for libthread GP fault") \ 2348 \ 2349 product(bool, PrintJNIGCStalls, false, \ 2350 "Print diagnostic message when GC is stalled" \ 2351 "by JNI critical section") \ 2352 \ 2353 /* GC log rotation setting */ \ 2354 \ 2355 product(bool, UseGCLogFileRotation, false, \ 2356 "Prevent large gclog file for long running app. " \ 2357 "Requires -Xloggc:<filename>") \ 2358 \ 2359 product(uintx, NumberOfGCLogFiles, 0, \ 2360 "Number of gclog files in rotation, " \ 2361 "Default: 0, no rotation") \ 2362 \ 2363 product(uintx, GCLogFileSize, 0, \ 2364 "GC log file size, Default: 0 bytes, no rotation " \ 2365 "Only valid with UseGCLogFileRotation") \ 2366 \ 2367 /* JVMTI heap profiling */ \ 2368 \ 2369 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2370 "Trace JVMTI object tagging calls") \ 2371 \ 2372 diagnostic(bool, VerifyBeforeIteration, false, \ 2373 "Verify memory system before JVMTI iteration") \ 2374 \ 2375 /* compiler interface */ \ 2376 \ 2377 develop(bool, CIPrintCompilerName, false, \ 2378 "when CIPrint is active, print the name of the active compiler") \ 2379 \ 2380 develop(bool, CIPrintCompileQueue, false, \ 2381 "display the contents of the compile queue whenever a " \ 2382 "compilation is enqueued") \ 2383 \ 2384 develop(bool, CIPrintRequests, false, \ 2385 "display every request for compilation") \ 2386 \ 2387 product(bool, CITime, false, \ 2388 "collect timing information for compilation") \ 2389 \ 2390 develop(bool, CITimeEach, false, \ 2391 "display timing information after each successful compilation") \ 2392 \ 2393 develop(bool, CICountOSR, true, \ 2394 "use a separate counter when assigning ids to osr compilations") \ 2395 \ 2396 develop(bool, CICompileNatives, true, \ 2397 "compile native methods if supported by the compiler") \ 2398 \ 2399 develop_pd(bool, CICompileOSR, \ 2400 "compile on stack replacement methods if supported by the " \ 2401 "compiler") \ 2402 \ 2403 develop(bool, CIPrintMethodCodes, false, \ 2404 "print method bytecodes of the compiled code") \ 2405 \ 2406 develop(bool, CIPrintTypeFlow, false, \ 2407 "print the results of ciTypeFlow analysis") \ 2408 \ 2409 develop(bool, CITraceTypeFlow, false, \ 2410 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2411 \ 2412 develop(intx, CICloneLoopTestLimit, 100, \ 2413 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2414 \ 2415 develop(intx, OSROnlyBCI, -1, \ 2416 "OSR only at this bci. Negative values mean exclude that bci") \ 2417 \ 2418 /* temp diagnostics */ \ 2419 \ 2420 diagnostic(bool, TraceRedundantCompiles, false, \ 2421 "Have compile broker print when a request already in the queue is"\ 2422 " requested again") \ 2423 \ 2424 diagnostic(bool, InitialCompileFast, false, \ 2425 "Initial compile at CompLevel_fast_compile") \ 2426 \ 2427 diagnostic(bool, InitialCompileReallyFast, false, \ 2428 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2429 \ 2430 diagnostic(bool, FullProfileOnReInterpret, true, \ 2431 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2432 \ 2433 /* compiler */ \ 2434 \ 2435 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2436 "Number of compiler threads to run") \ 2437 \ 2438 product(intx, CompilationPolicyChoice, 0, \ 2439 "which compilation policy (0/1)") \ 2440 \ 2441 develop(bool, UseStackBanging, true, \ 2442 "use stack banging for stack overflow checks (required for " \ 2443 "proper StackOverflow handling; disable only to measure cost " \ 2444 "of stackbanging)") \ 2445 \ 2446 develop(bool, Use24BitFPMode, true, \ 2447 "Set 24-bit FPU mode on a per-compile basis ") \ 2448 \ 2449 develop(bool, Use24BitFP, true, \ 2450 "use FP instructions that produce 24-bit precise results") \ 2451 \ 2452 develop(bool, UseStrictFP, true, \ 2453 "use strict fp if modifier strictfp is set") \ 2454 \ 2455 develop(bool, GenerateSynchronizationCode, true, \ 2456 "generate locking/unlocking code for synchronized methods and " \ 2457 "monitors") \ 2458 \ 2459 develop(bool, GenerateCompilerNullChecks, true, \ 2460 "Generate explicit null checks for loads/stores/calls") \ 2461 \ 2462 develop(bool, GenerateRangeChecks, true, \ 2463 "Generate range checks for array accesses") \ 2464 \ 2465 develop_pd(bool, ImplicitNullChecks, \ 2466 "generate code for implicit null checks") \ 2467 \ 2468 product(bool, PrintSafepointStatistics, false, \ 2469 "print statistics about safepoint synchronization") \ 2470 \ 2471 product(intx, PrintSafepointStatisticsCount, 300, \ 2472 "total number of safepoint statistics collected " \ 2473 "before printing them out") \ 2474 \ 2475 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2476 "print safepoint statistics only when safepoint takes" \ 2477 " more than PrintSafepointSatisticsTimeout in millis") \ 2478 \ 2479 product(bool, TraceSafepointCleanupTime, false, \ 2480 "print the break down of clean up tasks performed during" \ 2481 " safepoint") \ 2482 \ 2483 develop(bool, InlineAccessors, true, \ 2484 "inline accessor methods (get/set)") \ 2485 \ 2486 product(bool, Inline, true, \ 2487 "enable inlining") \ 2488 \ 2489 product(bool, ClipInlining, true, \ 2490 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2491 \ 2492 develop(bool, UseCHA, true, \ 2493 "enable CHA") \ 2494 \ 2495 product(bool, UseTypeProfile, true, \ 2496 "Check interpreter profile for historically monomorphic calls") \ 2497 \ 2498 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2499 "% of major receiver type to all profiled receivers") \ 2500 \ 2501 notproduct(bool, TimeCompiler, false, \ 2502 "time the compiler") \ 2503 \ 2504 notproduct(bool, TimeCompiler2, false, \ 2505 "detailed time the compiler (requires +TimeCompiler)") \ 2506 \ 2507 diagnostic(bool, PrintInlining, false, \ 2508 "prints inlining optimizations") \ 2509 \ 2510 diagnostic(bool, PrintIntrinsics, false, \ 2511 "prints attempted and successful inlining of intrinsics") \ 2512 \ 2513 product(bool, UseCountLeadingZerosInstruction, false, \ 2514 "Use count leading zeros instruction") \ 2515 \ 2516 product(bool, UsePopCountInstruction, false, \ 2517 "Use population count instruction") \ 2518 \ 2519 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2520 "do not expand intrinsics whose (internal) names appear here") \ 2521 \ 2522 develop(bool, StressReflectiveCode, false, \ 2523 "Use inexact types at allocations, etc., to test reflection") \ 2524 \ 2525 develop(bool, EagerInitialization, false, \ 2526 "Eagerly initialize classes if possible") \ 2527 \ 2528 develop(bool, TraceMethodReplacement, false, \ 2529 "Print when methods are replaced do to recompilation") \ 2530 \ 2531 develop(bool, PrintMethodFlushing, false, \ 2532 "print the nmethods being flushed") \ 2533 \ 2534 notproduct(bool, LogMultipleMutexLocking, false, \ 2535 "log locking and unlocking of mutexes (only if multiple locks " \ 2536 "are held)") \ 2537 \ 2538 develop(bool, UseRelocIndex, false, \ 2539 "use an index to speed random access to relocations") \ 2540 \ 2541 develop(bool, StressCodeBuffers, false, \ 2542 "Exercise code buffer expansion and other rare state changes") \ 2543 \ 2544 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2545 "Generate extra debugging info for non-safepoints in nmethods") \ 2546 \ 2547 diagnostic(bool, DebugInlinedCalls, true, \ 2548 "If false, restricts profiled locations to the root method only") \ 2549 \ 2550 product(bool, PrintVMOptions, trueInDebug, \ 2551 "Print flags that appeared on the command line") \ 2552 \ 2553 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2554 "Ignore unrecognized VM options") \ 2555 \ 2556 product(bool, PrintCommandLineFlags, false, \ 2557 "Print flags specified on command line or set by ergonomics") \ 2558 \ 2559 product(bool, PrintFlagsInitial, false, \ 2560 "Print all VM flags before argument processing and exit VM") \ 2561 \ 2562 product(bool, PrintFlagsFinal, false, \ 2563 "Print all VM flags after argument and ergonomic processing") \ 2564 \ 2565 notproduct(bool, PrintFlagsWithComments, false, \ 2566 "Print all VM flags with default values and descriptions and exit")\ 2567 \ 2568 diagnostic(bool, SerializeVMOutput, true, \ 2569 "Use a mutex to serialize output to tty and hotspot.log") \ 2570 \ 2571 diagnostic(bool, DisplayVMOutput, true, \ 2572 "Display all VM output on the tty, independently of LogVMOutput") \ 2573 \ 2574 diagnostic(bool, LogVMOutput, trueInDebug, \ 2575 "Save VM output to hotspot.log, or to LogFile") \ 2576 \ 2577 diagnostic(ccstr, LogFile, NULL, \ 2578 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2579 \ 2580 product(ccstr, ErrorFile, NULL, \ 2581 "If an error occurs, save the error data to this file " \ 2582 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2583 \ 2584 product(bool, DisplayVMOutputToStderr, false, \ 2585 "If DisplayVMOutput is true, display all VM output to stderr") \ 2586 \ 2587 product(bool, DisplayVMOutputToStdout, false, \ 2588 "If DisplayVMOutput is true, display all VM output to stdout") \ 2589 \ 2590 product(bool, UseHeavyMonitors, false, \ 2591 "use heavyweight instead of lightweight Java monitors") \ 2592 \ 2593 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2594 "print histogram of the symbol table") \ 2595 \ 2596 notproduct(bool, ExitVMOnVerifyError, false, \ 2597 "standard exit from VM if bytecode verify error " \ 2598 "(only in debug mode)") \ 2599 \ 2600 notproduct(ccstr, AbortVMOnException, NULL, \ 2601 "Call fatal if this exception is thrown. Example: " \ 2602 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2603 \ 2604 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2605 "Call fatal if the exception pointed by AbortVMOnException " \ 2606 "has this message.") \ 2607 \ 2608 develop(bool, DebugVtables, false, \ 2609 "add debugging code to vtable dispatch") \ 2610 \ 2611 develop(bool, PrintVtables, false, \ 2612 "print vtables when printing klass") \ 2613 \ 2614 notproduct(bool, PrintVtableStats, false, \ 2615 "print vtables stats at end of run") \ 2616 \ 2617 develop(bool, TraceCreateZombies, false, \ 2618 "trace creation of zombie nmethods") \ 2619 \ 2620 notproduct(bool, IgnoreLockingAssertions, false, \ 2621 "disable locking assertions (for speed)") \ 2622 \ 2623 notproduct(bool, VerifyLoopOptimizations, false, \ 2624 "verify major loop optimizations") \ 2625 \ 2626 product(bool, RangeCheckElimination, true, \ 2627 "Split loop iterations to eliminate range checks") \ 2628 \ 2629 develop_pd(bool, UncommonNullCast, \ 2630 "track occurrences of null in casts; adjust compiler tactics") \ 2631 \ 2632 develop(bool, TypeProfileCasts, true, \ 2633 "treat casts like calls for purposes of type profiling") \ 2634 \ 2635 develop(bool, MonomorphicArrayCheck, true, \ 2636 "Uncommon-trap array store checks that require full type check") \ 2637 \ 2638 diagnostic(bool, ProfileDynamicTypes, true, \ 2639 "do extra type profiling and use it more aggressively") \ 2640 \ 2641 develop(bool, DelayCompilationDuringStartup, true, \ 2642 "Delay invoking the compiler until main application class is " \ 2643 "loaded") \ 2644 \ 2645 develop(bool, CompileTheWorld, false, \ 2646 "Compile all methods in all classes in bootstrap class path " \ 2647 "(stress test)") \ 2648 \ 2649 develop(bool, CompileTheWorldPreloadClasses, true, \ 2650 "Preload all classes used by a class before start loading") \ 2651 \ 2652 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2653 "Force a safepoint every n compiles so sweeper can keep up") \ 2654 \ 2655 develop(bool, TraceIterativeGVN, false, \ 2656 "Print progress during Iterative Global Value Numbering") \ 2657 \ 2658 develop(bool, FillDelaySlots, true, \ 2659 "Fill delay slots (on SPARC only)") \ 2660 \ 2661 develop(bool, VerifyIterativeGVN, false, \ 2662 "Verify Def-Use modifications during sparse Iterative Global " \ 2663 "Value Numbering") \ 2664 \ 2665 notproduct(bool, TracePhaseCCP, false, \ 2666 "Print progress during Conditional Constant Propagation") \ 2667 \ 2668 develop(bool, TimeLivenessAnalysis, false, \ 2669 "Time computation of bytecode liveness analysis") \ 2670 \ 2671 develop(bool, TraceLivenessGen, false, \ 2672 "Trace the generation of liveness analysis information") \ 2673 \ 2674 notproduct(bool, TraceLivenessQuery, false, \ 2675 "Trace queries of liveness analysis information") \ 2676 \ 2677 notproduct(bool, CollectIndexSetStatistics, false, \ 2678 "Collect information about IndexSets") \ 2679 \ 2680 develop(bool, PrintDominators, false, \ 2681 "Print out dominator trees for GVN") \ 2682 \ 2683 develop(bool, UseLoopSafepoints, true, \ 2684 "Generate Safepoint nodes in every loop") \ 2685 \ 2686 notproduct(bool, TraceCISCSpill, false, \ 2687 "Trace allocators use of cisc spillable instructions") \ 2688 \ 2689 notproduct(bool, TraceSpilling, false, \ 2690 "Trace spilling") \ 2691 \ 2692 product(bool, SplitIfBlocks, true, \ 2693 "Clone compares and control flow through merge points to fold " \ 2694 "some branches") \ 2695 \ 2696 develop(intx, FastAllocateSizeLimit, 128*K, \ 2697 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2698 "Inline allocations larger than this in doublewords must go slow")\ 2699 \ 2700 product(bool, AggressiveOpts, false, \ 2701 "Enable aggressive optimizations - see arguments.cpp") \ 2702 \ 2703 product(bool, UseStringCache, false, \ 2704 "Enable String cache capabilities on String.java") \ 2705 \ 2706 /* statistics */ \ 2707 develop(bool, CountCompiledCalls, false, \ 2708 "counts method invocations") \ 2709 \ 2710 notproduct(bool, CountRuntimeCalls, false, \ 2711 "counts VM runtime calls") \ 2712 \ 2713 develop(bool, CountJNICalls, false, \ 2714 "counts jni method invocations") \ 2715 \ 2716 notproduct(bool, CountJVMCalls, false, \ 2717 "counts jvm method invocations") \ 2718 \ 2719 notproduct(bool, CountRemovableExceptions, false, \ 2720 "count exceptions that could be replaced by branches due to " \ 2721 "inlining") \ 2722 \ 2723 notproduct(bool, ICMissHistogram, false, \ 2724 "produce histogram of IC misses") \ 2725 \ 2726 notproduct(bool, PrintClassStatistics, false, \ 2727 "prints class statistics at end of run") \ 2728 \ 2729 notproduct(bool, PrintMethodStatistics, false, \ 2730 "prints method statistics at end of run") \ 2731 \ 2732 /* interpreter */ \ 2733 develop(bool, ClearInterpreterLocals, false, \ 2734 "Always clear local variables of interpreter activations upon " \ 2735 "entry") \ 2736 \ 2737 product_pd(bool, RewriteBytecodes, \ 2738 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2739 \ 2740 product_pd(bool, RewriteFrequentPairs, \ 2741 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2742 \ 2743 diagnostic(bool, PrintInterpreter, false, \ 2744 "Prints the generated interpreter code") \ 2745 \ 2746 product(bool, UseInterpreter, true, \ 2747 "Use interpreter for non-compiled methods") \ 2748 \ 2749 develop(bool, UseFastSignatureHandlers, true, \ 2750 "Use fast signature handlers for native calls") \ 2751 \ 2752 develop(bool, UseV8InstrsOnly, false, \ 2753 "Use SPARC-V8 Compliant instruction subset") \ 2754 \ 2755 product(bool, UseNiagaraInstrs, false, \ 2756 "Use Niagara-efficient instruction subset") \ 2757 \ 2758 develop(bool, UseCASForSwap, false, \ 2759 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2760 \ 2761 product(bool, UseLoopCounter, true, \ 2762 "Increment invocation counter on backward branch") \ 2763 \ 2764 product(bool, UseFastEmptyMethods, true, \ 2765 "Use fast method entry code for empty methods") \ 2766 \ 2767 product(bool, UseFastAccessorMethods, true, \ 2768 "Use fast method entry code for accessor methods") \ 2769 \ 2770 product_pd(bool, UseOnStackReplacement, \ 2771 "Use on stack replacement, calls runtime if invoc. counter " \ 2772 "overflows in loop") \ 2773 \ 2774 notproduct(bool, TraceOnStackReplacement, false, \ 2775 "Trace on stack replacement") \ 2776 \ 2777 develop(bool, PoisonOSREntry, true, \ 2778 "Detect abnormal calls to OSR code") \ 2779 \ 2780 product_pd(bool, PreferInterpreterNativeStubs, \ 2781 "Use always interpreter stubs for native methods invoked via " \ 2782 "interpreter") \ 2783 \ 2784 develop(bool, CountBytecodes, false, \ 2785 "Count number of bytecodes executed") \ 2786 \ 2787 develop(bool, PrintBytecodeHistogram, false, \ 2788 "Print histogram of the executed bytecodes") \ 2789 \ 2790 develop(bool, PrintBytecodePairHistogram, false, \ 2791 "Print histogram of the executed bytecode pairs") \ 2792 \ 2793 diagnostic(bool, PrintSignatureHandlers, false, \ 2794 "Print code generated for native method signature handlers") \ 2795 \ 2796 develop(bool, VerifyOops, false, \ 2797 "Do plausibility checks for oops") \ 2798 \ 2799 develop(bool, CheckUnhandledOops, false, \ 2800 "Check for unhandled oops in VM code") \ 2801 \ 2802 develop(bool, VerifyJNIFields, trueInDebug, \ 2803 "Verify jfieldIDs for instance fields") \ 2804 \ 2805 notproduct(bool, VerifyJNIEnvThread, false, \ 2806 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2807 "from JNI") \ 2808 \ 2809 develop(bool, VerifyFPU, false, \ 2810 "Verify FPU state (check for NaN's, etc.)") \ 2811 \ 2812 develop(bool, VerifyThread, false, \ 2813 "Watch the thread register for corruption (SPARC only)") \ 2814 \ 2815 develop(bool, VerifyActivationFrameSize, false, \ 2816 "Verify that activation frame didn't become smaller than its " \ 2817 "minimal size") \ 2818 \ 2819 develop(bool, TraceFrequencyInlining, false, \ 2820 "Trace frequency based inlining") \ 2821 \ 2822 notproduct(bool, TraceTypeProfile, false, \ 2823 "Trace type profile") \ 2824 \ 2825 develop_pd(bool, InlineIntrinsics, \ 2826 "Inline intrinsics that can be statically resolved") \ 2827 \ 2828 product_pd(bool, ProfileInterpreter, \ 2829 "Profile at the bytecode level during interpretation") \ 2830 \ 2831 develop_pd(bool, ProfileTraps, \ 2832 "Profile deoptimization traps at the bytecode level") \ 2833 \ 2834 product(intx, ProfileMaturityPercentage, 20, \ 2835 "number of method invocations/branches (expressed as % of " \ 2836 "CompileThreshold) before using the method's profile") \ 2837 \ 2838 develop(bool, PrintMethodData, false, \ 2839 "Print the results of +ProfileInterpreter at end of run") \ 2840 \ 2841 develop(bool, VerifyDataPointer, trueInDebug, \ 2842 "Verify the method data pointer during interpreter profiling") \ 2843 \ 2844 develop(bool, VerifyCompiledCode, false, \ 2845 "Include miscellaneous runtime verifications in nmethod code; " \ 2846 "default off because it disturbs nmethod size heuristics") \ 2847 \ 2848 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2849 "Manually make GC thread crash then dump java stack trace; " \ 2850 "Test only") \ 2851 \ 2852 /* compilation */ \ 2853 product(bool, UseCompiler, true, \ 2854 "use compilation") \ 2855 \ 2856 develop(bool, TraceCompilationPolicy, false, \ 2857 "Trace compilation policy") \ 2858 \ 2859 develop(bool, TimeCompilationPolicy, false, \ 2860 "Time the compilation policy") \ 2861 \ 2862 product(bool, UseCounterDecay, true, \ 2863 "adjust recompilation counters") \ 2864 \ 2865 develop(intx, CounterHalfLifeTime, 30, \ 2866 "half-life time of invocation counters (in secs)") \ 2867 \ 2868 develop(intx, CounterDecayMinIntervalLength, 500, \ 2869 "Min. ms. between invocation of CounterDecay") \ 2870 \ 2871 product(bool, AlwaysCompileLoopMethods, false, \ 2872 "when using recompilation, never interpret methods " \ 2873 "containing loops") \ 2874 \ 2875 product(bool, DontCompileHugeMethods, true, \ 2876 "don't compile methods > HugeMethodLimit") \ 2877 \ 2878 /* Bytecode escape analysis estimation. */ \ 2879 product(bool, EstimateArgEscape, true, \ 2880 "Analyze bytecodes to estimate escape state of arguments") \ 2881 \ 2882 product(intx, BCEATraceLevel, 0, \ 2883 "How much tracing to do of bytecode escape analysis estimates") \ 2884 \ 2885 product(intx, MaxBCEAEstimateLevel, 5, \ 2886 "Maximum number of nested calls that are analyzed by BC EA.") \ 2887 \ 2888 product(intx, MaxBCEAEstimateSize, 150, \ 2889 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2890 \ 2891 product(intx, AllocatePrefetchStyle, 1, \ 2892 "0 = no prefetch, " \ 2893 "1 = prefetch instructions for each allocation, " \ 2894 "2 = use TLAB watermark to gate allocation prefetch, " \ 2895 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2896 \ 2897 product(intx, AllocatePrefetchDistance, -1, \ 2898 "Distance to prefetch ahead of allocation pointer") \ 2899 \ 2900 product(intx, AllocatePrefetchLines, 3, \ 2901 "Number of lines to prefetch ahead of array allocation pointer") \ 2902 \ 2903 product(intx, AllocateInstancePrefetchLines, 1, \ 2904 "Number of lines to prefetch ahead of instance allocation pointer") \ 2905 \ 2906 product(intx, AllocatePrefetchStepSize, 16, \ 2907 "Step size in bytes of sequential prefetch instructions") \ 2908 \ 2909 product(intx, AllocatePrefetchInstr, 0, \ 2910 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2911 \ 2912 product(intx, ReadPrefetchInstr, 0, \ 2913 "Prefetch instruction to prefetch ahead") \ 2914 \ 2915 /* deoptimization */ \ 2916 develop(bool, TraceDeoptimization, false, \ 2917 "Trace deoptimization") \ 2918 \ 2919 develop(bool, DebugDeoptimization, false, \ 2920 "Tracing various information while debugging deoptimization") \ 2921 \ 2922 product(intx, SelfDestructTimer, 0, \ 2923 "Will cause VM to terminate after a given time (in minutes) " \ 2924 "(0 means off)") \ 2925 \ 2926 product(intx, MaxJavaStackTraceDepth, 1024, \ 2927 "Max. no. of lines in the stack trace for Java exceptions " \ 2928 "(0 means all)") \ 2929 \ 2930 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2931 "Guarantee a safepoint (at least) every so many milliseconds " \ 2932 "(0 means none)")) \ 2933 \ 2934 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2935 "Guarantee a safepoint (at least) every so many milliseconds " \ 2936 "(0 means none)")) \ 2937 \ 2938 product(intx, SafepointTimeoutDelay, 10000, \ 2939 "Delay in milliseconds for option SafepointTimeout") \ 2940 \ 2941 product(intx, NmethodSweepFraction, 4, \ 2942 "Number of invocations of sweeper to cover all nmethods") \ 2943 \ 2944 product(intx, NmethodSweepCheckInterval, 5, \ 2945 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2946 \ 2947 notproduct(bool, LogSweeper, false, \ 2948 "Keep a ring buffer of sweeper activity") \ 2949 \ 2950 notproduct(intx, SweeperLogEntries, 1024, \ 2951 "Number of records in the ring buffer of sweeper activity") \ 2952 \ 2953 notproduct(intx, MemProfilingInterval, 500, \ 2954 "Time between each invocation of the MemProfiler") \ 2955 \ 2956 develop(intx, MallocCatchPtr, -1, \ 2957 "Hit breakpoint when mallocing/freeing this pointer") \ 2958 \ 2959 notproduct(intx, AssertRepeat, 1, \ 2960 "number of times to evaluate expression in assert " \ 2961 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2962 \ 2963 notproduct(ccstrlist, SuppressErrorAt, "", \ 2964 "List of assertions (file:line) to muzzle") \ 2965 \ 2966 notproduct(uintx, HandleAllocationLimit, 1024, \ 2967 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2968 "is used") \ 2969 \ 2970 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2971 "Threshold for total handle allocation when " \ 2972 "+TraceHandleAllocation is used") \ 2973 \ 2974 develop(intx, StackPrintLimit, 100, \ 2975 "number of stack frames to print in VM-level stack dump") \ 2976 \ 2977 notproduct(intx, MaxElementPrintSize, 256, \ 2978 "maximum number of elements to print") \ 2979 \ 2980 notproduct(intx, MaxSubklassPrintSize, 4, \ 2981 "maximum number of subklasses to print when printing klass") \ 2982 \ 2983 product(intx, MaxInlineLevel, 9, \ 2984 "maximum number of nested calls that are inlined") \ 2985 \ 2986 product(intx, MaxRecursiveInlineLevel, 1, \ 2987 "maximum number of nested recursive calls that are inlined") \ 2988 \ 2989 product_pd(intx, InlineSmallCode, \ 2990 "Only inline already compiled methods if their code size is " \ 2991 "less than this") \ 2992 \ 2993 product(intx, MaxInlineSize, 35, \ 2994 "maximum bytecode size of a method to be inlined") \ 2995 \ 2996 product_pd(intx, FreqInlineSize, \ 2997 "maximum bytecode size of a frequent method to be inlined") \ 2998 \ 2999 product(intx, MaxTrivialSize, 6, \ 3000 "maximum bytecode size of a trivial method to be inlined") \ 3001 \ 3002 product(intx, MinInliningThreshold, 250, \ 3003 "min. invocation count a method needs to have to be inlined") \ 3004 \ 3005 develop(intx, AlignEntryCode, 4, \ 3006 "aligns entry code to specified value (in bytes)") \ 3007 \ 3008 develop(intx, MethodHistogramCutoff, 100, \ 3009 "cutoff value for method invoc. histogram (+CountCalls)") \ 3010 \ 3011 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3012 "# of interpreted methods to show in profile") \ 3013 \ 3014 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3015 "# of compiled methods to show in profile") \ 3016 \ 3017 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3018 "# of stub methods to show in profile") \ 3019 \ 3020 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3021 "# of runtime stub nodes to show in profile") \ 3022 \ 3023 product(intx, ProfileIntervalsTicks, 100, \ 3024 "# of ticks between printing of interval profile " \ 3025 "(+ProfileIntervals)") \ 3026 \ 3027 notproduct(intx, ScavengeALotInterval, 1, \ 3028 "Interval between which scavenge will occur with +ScavengeALot") \ 3029 \ 3030 notproduct(intx, FullGCALotInterval, 1, \ 3031 "Interval between which full gc will occur with +FullGCALot") \ 3032 \ 3033 notproduct(intx, FullGCALotStart, 0, \ 3034 "For which invocation to start FullGCAlot") \ 3035 \ 3036 notproduct(intx, FullGCALotDummies, 32*K, \ 3037 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3038 "to move") \ 3039 \ 3040 develop(intx, DontYieldALotInterval, 10, \ 3041 "Interval between which yields will be dropped (milliseconds)") \ 3042 \ 3043 develop(intx, MinSleepInterval, 1, \ 3044 "Minimum sleep() interval (milliseconds) when " \ 3045 "ConvertSleepToYield is off (used for SOLARIS)") \ 3046 \ 3047 product(intx, EventLogLength, 2000, \ 3048 "maximum nof events in event log") \ 3049 \ 3050 develop(intx, ProfilerPCTickThreshold, 15, \ 3051 "Number of ticks in a PC buckets to be a hotspot") \ 3052 \ 3053 notproduct(intx, DeoptimizeALotInterval, 5, \ 3054 "Number of exits until DeoptimizeALot kicks in") \ 3055 \ 3056 notproduct(intx, ZombieALotInterval, 5, \ 3057 "Number of exits until ZombieALot kicks in") \ 3058 \ 3059 develop(bool, StressNonEntrant, false, \ 3060 "Mark nmethods non-entrant at registration") \ 3061 \ 3062 diagnostic(intx, MallocVerifyInterval, 0, \ 3063 "if non-zero, verify C heap after every N calls to " \ 3064 "malloc/realloc/free") \ 3065 \ 3066 diagnostic(intx, MallocVerifyStart, 0, \ 3067 "if non-zero, start verifying C heap after Nth call to " \ 3068 "malloc/realloc/free") \ 3069 \ 3070 product(intx, TypeProfileWidth, 2, \ 3071 "number of receiver types to record in call/cast profile") \ 3072 \ 3073 develop(intx, BciProfileWidth, 2, \ 3074 "number of return bci's to record in ret profile") \ 3075 \ 3076 product(intx, PerMethodRecompilationCutoff, 400, \ 3077 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3078 \ 3079 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3080 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3081 \ 3082 product(intx, PerMethodTrapLimit, 100, \ 3083 "Limit on traps (of one kind) in a method (includes inlines)") \ 3084 \ 3085 product(intx, PerBytecodeTrapLimit, 4, \ 3086 "Limit on traps (of one kind) at a particular BCI") \ 3087 \ 3088 develop(intx, FreqCountInvocations, 1, \ 3089 "Scaling factor for branch frequencies (deprecated)") \ 3090 \ 3091 develop(intx, InlineFrequencyRatio, 20, \ 3092 "Ratio of call site execution to caller method invocation") \ 3093 \ 3094 develop_pd(intx, InlineFrequencyCount, \ 3095 "Count of call site execution necessary to trigger frequent " \ 3096 "inlining") \ 3097 \ 3098 develop(intx, InlineThrowCount, 50, \ 3099 "Force inlining of interpreted methods that throw this often") \ 3100 \ 3101 develop(intx, InlineThrowMaxSize, 200, \ 3102 "Force inlining of throwing methods smaller than this") \ 3103 \ 3104 product(intx, AliasLevel, 3, \ 3105 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3106 "2 for class split, 3 for unique instances") \ 3107 \ 3108 develop(bool, VerifyAliases, false, \ 3109 "perform extra checks on the results of alias analysis") \ 3110 \ 3111 develop(intx, ProfilerNodeSize, 1024, \ 3112 "Size in K to allocate for the Profile Nodes of each thread") \ 3113 \ 3114 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3115 "Number of times to spin wait on a v8 atomic operation lock") \ 3116 \ 3117 product(intx, ReadSpinIterations, 100, \ 3118 "Number of read attempts before a yield (spin inner loop)") \ 3119 \ 3120 product_pd(intx, PreInflateSpin, \ 3121 "Number of times to spin wait before inflation") \ 3122 \ 3123 product(intx, PreBlockSpin, 10, \ 3124 "Number of times to spin in an inflated lock before going to " \ 3125 "an OS lock") \ 3126 \ 3127 /* gc parameters */ \ 3128 product(uintx, InitialHeapSize, 0, \ 3129 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3130 \ 3131 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3132 "Maximum heap size (in bytes)") \ 3133 \ 3134 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3135 "Initial tenured generation size (in bytes)") \ 3136 \ 3137 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3138 "Initial new generation size (in bytes)") \ 3139 \ 3140 product(uintx, MaxNewSize, max_uintx, \ 3141 "Maximum new generation size (in bytes), max_uintx means set " \ 3142 "ergonomically") \ 3143 \ 3144 product(uintx, PretenureSizeThreshold, 0, \ 3145 "Maximum size in bytes of objects allocated in DefNew " \ 3146 "generation; zero means no maximum") \ 3147 \ 3148 product(uintx, TLABSize, 0, \ 3149 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3150 \ 3151 product(uintx, MinTLABSize, 2*K, \ 3152 "Minimum allowed TLAB size (in bytes)") \ 3153 \ 3154 product(uintx, TLABAllocationWeight, 35, \ 3155 "Allocation averaging weight") \ 3156 \ 3157 product(uintx, TLABWasteTargetPercent, 1, \ 3158 "Percentage of Eden that can be wasted") \ 3159 \ 3160 product(uintx, TLABRefillWasteFraction, 64, \ 3161 "Max TLAB waste at a refill (internal fragmentation)") \ 3162 \ 3163 product(uintx, TLABWasteIncrement, 4, \ 3164 "Increment allowed waste at slow allocation") \ 3165 \ 3166 product(intx, SurvivorRatio, 8, \ 3167 "Ratio of eden/survivor space size") \ 3168 \ 3169 product(intx, NewRatio, 2, \ 3170 "Ratio of new/old generation sizes") \ 3171 \ 3172 product_pd(uintx, NewSizeThreadIncrease, \ 3173 "Additional size added to desired new generation size per " \ 3174 "non-daemon thread (in bytes)") \ 3175 \ 3176 product_pd(uintx, PermSize, \ 3177 "Initial size of permanent generation (in bytes)") \ 3178 \ 3179 product_pd(uintx, MaxPermSize, \ 3180 "Maximum size of permanent generation (in bytes)") \ 3181 \ 3182 product(uintx, MinHeapFreeRatio, 40, \ 3183 "Min percentage of heap free after GC to avoid expansion") \ 3184 \ 3185 product(uintx, MaxHeapFreeRatio, 70, \ 3186 "Max percentage of heap free after GC to avoid shrinking") \ 3187 \ 3188 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3189 "Number of milliseconds per MB of free space in the heap") \ 3190 \ 3191 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3192 "Min change in heap space due to GC (in bytes)") \ 3193 \ 3194 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3195 "Min expansion of permanent heap (in bytes)") \ 3196 \ 3197 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3198 "Max expansion of permanent heap without full GC (in bytes)") \ 3199 \ 3200 product(intx, QueuedAllocationWarningCount, 0, \ 3201 "Number of times an allocation that queues behind a GC " \ 3202 "will retry before printing a warning") \ 3203 \ 3204 diagnostic(uintx, VerifyGCStartAt, 0, \ 3205 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3206 \ 3207 diagnostic(intx, VerifyGCLevel, 0, \ 3208 "Generation level at which to start +VerifyBefore/AfterGC") \ 3209 \ 3210 develop(uintx, ExitAfterGCNum, 0, \ 3211 "If non-zero, exit after this GC.") \ 3212 \ 3213 product(intx, MaxTenuringThreshold, 15, \ 3214 "Maximum value for tenuring threshold") \ 3215 \ 3216 product(intx, InitialTenuringThreshold, 7, \ 3217 "Initial value for tenuring threshold") \ 3218 \ 3219 product(intx, TargetSurvivorRatio, 50, \ 3220 "Desired percentage of survivor space used after scavenge") \ 3221 \ 3222 product(uintx, MarkSweepDeadRatio, 5, \ 3223 "Percentage (0-100) of the old gen allowed as dead wood." \ 3224 "Serial mark sweep treats this as both the min and max value." \ 3225 "CMS uses this value only if it falls back to mark sweep." \ 3226 "Par compact uses a variable scale based on the density of the" \ 3227 "generation and treats this as the max value when the heap is" \ 3228 "either completely full or completely empty. Par compact also" \ 3229 "has a smaller default value; see arguments.cpp.") \ 3230 \ 3231 product(uintx, PermMarkSweepDeadRatio, 20, \ 3232 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3233 "See MarkSweepDeadRatio for collector-specific comments.") \ 3234 \ 3235 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3236 "How often should we fully compact the heap (ignoring the dead " \ 3237 "space parameters)") \ 3238 \ 3239 product(intx, PrintCMSStatistics, 0, \ 3240 "Statistics for CMS") \ 3241 \ 3242 product(bool, PrintCMSInitiationStatistics, false, \ 3243 "Statistics for initiating a CMS collection") \ 3244 \ 3245 product(intx, PrintFLSStatistics, 0, \ 3246 "Statistics for CMS' FreeListSpace") \ 3247 \ 3248 product(intx, PrintFLSCensus, 0, \ 3249 "Census for CMS' FreeListSpace") \ 3250 \ 3251 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3252 "Delay in ms between expansion and allocation") \ 3253 \ 3254 product(intx, DeferThrSuspendLoopCount, 4000, \ 3255 "(Unstable) Number of times to iterate in safepoint loop " \ 3256 " before blocking VM threads ") \ 3257 \ 3258 product(intx, DeferPollingPageLoopCount, -1, \ 3259 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3260 "before changing safepoint polling page to RO ") \ 3261 \ 3262 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3263 \ 3264 product(bool, PSChunkLargeArrays, true, \ 3265 "true: process large arrays in chunks") \ 3266 \ 3267 product(uintx, GCDrainStackTargetSize, 64, \ 3268 "how many entries we'll try to leave on the stack during " \ 3269 "parallel GC") \ 3270 \ 3271 /* stack parameters */ \ 3272 product_pd(intx, StackYellowPages, \ 3273 "Number of yellow zone (recoverable overflows) pages") \ 3274 \ 3275 product_pd(intx, StackRedPages, \ 3276 "Number of red zone (unrecoverable overflows) pages") \ 3277 \ 3278 product_pd(intx, StackShadowPages, \ 3279 "Number of shadow zone (for overflow checking) pages" \ 3280 " this should exceed the depth of the VM and native call stack") \ 3281 \ 3282 product_pd(intx, ThreadStackSize, \ 3283 "Thread Stack Size (in Kbytes)") \ 3284 \ 3285 product_pd(intx, VMThreadStackSize, \ 3286 "Non-Java Thread Stack Size (in Kbytes)") \ 3287 \ 3288 product_pd(intx, CompilerThreadStackSize, \ 3289 "Compiler Thread Stack Size (in Kbytes)") \ 3290 \ 3291 develop_pd(uintx, JVMInvokeMethodSlack, \ 3292 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3293 \ 3294 product(uintx, ThreadSafetyMargin, 50*M, \ 3295 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3296 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3297 "disable this feature") \ 3298 \ 3299 /* code cache parameters */ \ 3300 develop(uintx, CodeCacheSegmentSize, 64, \ 3301 "Code cache segment size (in bytes) - smallest unit of " \ 3302 "allocation") \ 3303 \ 3304 develop_pd(intx, CodeEntryAlignment, \ 3305 "Code entry alignment for generated code (in bytes)") \ 3306 \ 3307 product_pd(intx, OptoLoopAlignment, \ 3308 "Align inner loops to zero relative to this modulus") \ 3309 \ 3310 product_pd(uintx, InitialCodeCacheSize, \ 3311 "Initial code cache size (in bytes)") \ 3312 \ 3313 product_pd(uintx, ReservedCodeCacheSize, \ 3314 "Reserved code cache size (in bytes) - maximum code cache size") \ 3315 \ 3316 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3317 "When less than X space left, we stop compiling.") \ 3318 \ 3319 product_pd(uintx, CodeCacheExpansionSize, \ 3320 "Code cache expansion size (in bytes)") \ 3321 \ 3322 develop_pd(uintx, CodeCacheMinBlockLength, \ 3323 "Minimum number of segments in a code cache block.") \ 3324 \ 3325 notproduct(bool, ExitOnFullCodeCache, false, \ 3326 "Exit the VM if we fill the code cache.") \ 3327 \ 3328 product(bool, UseCodeCacheFlushing, false, \ 3329 "Attempt to clean the code cache before shutting off compiler") \ 3330 \ 3331 product(intx, MinCodeCacheFlushingInterval, 30, \ 3332 "Min number of seconds between code cache cleaning sessions") \ 3333 \ 3334 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3335 "When less than X space left, start code cache cleaning") \ 3336 \ 3337 /* interpreter debugging */ \ 3338 develop(intx, BinarySwitchThreshold, 5, \ 3339 "Minimal number of lookupswitch entries for rewriting to binary " \ 3340 "switch") \ 3341 \ 3342 develop(intx, StopInterpreterAt, 0, \ 3343 "Stops interpreter execution at specified bytecode number") \ 3344 \ 3345 develop(intx, TraceBytecodesAt, 0, \ 3346 "Traces bytecodes starting with specified bytecode number") \ 3347 \ 3348 /* compiler interface */ \ 3349 develop(intx, CIStart, 0, \ 3350 "the id of the first compilation to permit") \ 3351 \ 3352 develop(intx, CIStop, -1, \ 3353 "the id of the last compilation to permit") \ 3354 \ 3355 develop(intx, CIStartOSR, 0, \ 3356 "the id of the first osr compilation to permit " \ 3357 "(CICountOSR must be on)") \ 3358 \ 3359 develop(intx, CIStopOSR, -1, \ 3360 "the id of the last osr compilation to permit " \ 3361 "(CICountOSR must be on)") \ 3362 \ 3363 develop(intx, CIBreakAtOSR, -1, \ 3364 "id of osr compilation to break at") \ 3365 \ 3366 develop(intx, CIBreakAt, -1, \ 3367 "id of compilation to break at") \ 3368 \ 3369 product(ccstrlist, CompileOnly, "", \ 3370 "List of methods (pkg/class.name) to restrict compilation to") \ 3371 \ 3372 product(ccstr, CompileCommandFile, NULL, \ 3373 "Read compiler commands from this file [.hotspot_compiler]") \ 3374 \ 3375 product(ccstrlist, CompileCommand, "", \ 3376 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3377 \ 3378 product(bool, CICompilerCountPerCPU, false, \ 3379 "1 compiler thread for log(N CPUs)") \ 3380 \ 3381 develop(intx, CIFireOOMAt, -1, \ 3382 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3383 "(non-negative value throws OOM after this many CI accesses " \ 3384 "in each compile)") \ 3385 \ 3386 develop(intx, CIFireOOMAtDelay, -1, \ 3387 "Wait for this many CI accesses to occur in all compiles before " \ 3388 "beginning to throw OutOfMemoryErrors in each compile") \ 3389 \ 3390 notproduct(bool, CIObjectFactoryVerify, false, \ 3391 "enable potentially expensive verification in ciObjectFactory") \ 3392 \ 3393 /* Priorities */ \ 3394 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3395 \ 3396 product(intx, ThreadPriorityPolicy, 0, \ 3397 "0 : Normal. "\ 3398 " VM chooses priorities that are appropriate for normal "\ 3399 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3400 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3401 " map to lower native priority values. On Windows applications"\ 3402 " are allowed to use higher native priorities. However, with "\ 3403 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3404 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3405 " interfere with system threads. On Linux thread priorities "\ 3406 " are ignored because the OS does not support static priority "\ 3407 " in SCHED_OTHER scheduling class which is the only choice for"\ 3408 " non-root, non-realtime applications. "\ 3409 "1 : Aggressive. "\ 3410 " Java thread priorities map over to the entire range of "\ 3411 " native thread priorities. Higher Java thread priorities map "\ 3412 " to higher native thread priorities. This policy should be "\ 3413 " used with care, as sometimes it can cause performance "\ 3414 " degradation in the application and/or the entire system. On "\ 3415 " Linux this policy requires root privilege.") \ 3416 \ 3417 product(bool, ThreadPriorityVerbose, false, \ 3418 "print priority changes") \ 3419 \ 3420 product(intx, DefaultThreadPriority, -1, \ 3421 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3422 \ 3423 product(intx, CompilerThreadPriority, -1, \ 3424 "what priority should compiler threads run at (-1 means no change)") \ 3425 \ 3426 product(intx, VMThreadPriority, -1, \ 3427 "what priority should VM threads run at (-1 means no change)") \ 3428 \ 3429 product(bool, CompilerThreadHintNoPreempt, true, \ 3430 "(Solaris only) Give compiler threads an extra quanta") \ 3431 \ 3432 product(bool, VMThreadHintNoPreempt, false, \ 3433 "(Solaris only) Give VM thread an extra quanta") \ 3434 \ 3435 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3436 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3437 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3438 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3439 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3440 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3441 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3442 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3443 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3444 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3445 \ 3446 /* compiler debugging */ \ 3447 notproduct(intx, CompileTheWorldStartAt, 1, \ 3448 "First class to consider when using +CompileTheWorld") \ 3449 \ 3450 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3451 "Last class to consider when using +CompileTheWorld") \ 3452 \ 3453 develop(intx, NewCodeParameter, 0, \ 3454 "Testing Only: Create a dedicated integer parameter before " \ 3455 "putback") \ 3456 \ 3457 /* new oopmap storage allocation */ \ 3458 develop(intx, MinOopMapAllocation, 8, \ 3459 "Minimum number of OopMap entries in an OopMapSet") \ 3460 \ 3461 /* Background Compilation */ \ 3462 develop(intx, LongCompileThreshold, 50, \ 3463 "Used with +TraceLongCompiles") \ 3464 \ 3465 product(intx, StarvationMonitorInterval, 200, \ 3466 "Pause between each check in ms") \ 3467 \ 3468 /* recompilation */ \ 3469 product_pd(intx, CompileThreshold, \ 3470 "number of interpreted method invocations before (re-)compiling") \ 3471 \ 3472 product_pd(intx, BackEdgeThreshold, \ 3473 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3474 \ 3475 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3476 "Interpreter (tier 0) invocation notification frequency.") \ 3477 \ 3478 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3479 "C1 without MDO (tier 2) invocation notification frequency.") \ 3480 \ 3481 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3482 "C1 with MDO profiling (tier 3) invocation notification " \ 3483 "frequency.") \ 3484 \ 3485 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3486 "Interpreter (tier 0) invocation notification frequency.") \ 3487 \ 3488 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3489 "C1 without MDO (tier 2) invocation notification frequency.") \ 3490 \ 3491 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3492 "C1 with MDO profiling (tier 3) invocation notification " \ 3493 "frequency.") \ 3494 \ 3495 product(intx, Tier2CompileThreshold, 0, \ 3496 "threshold at which tier 2 compilation is invoked") \ 3497 \ 3498 product(intx, Tier2BackEdgeThreshold, 0, \ 3499 "Back edge threshold at which tier 2 compilation is invoked") \ 3500 \ 3501 product(intx, Tier3InvocationThreshold, 200, \ 3502 "Compile if number of method invocations crosses this " \ 3503 "threshold") \ 3504 \ 3505 product(intx, Tier3MinInvocationThreshold, 100, \ 3506 "Minimum invocation to compile at tier 3") \ 3507 \ 3508 product(intx, Tier3CompileThreshold, 2000, \ 3509 "Threshold at which tier 3 compilation is invoked (invocation " \ 3510 "minimum must be satisfied.") \ 3511 \ 3512 product(intx, Tier3BackEdgeThreshold, 7000, \ 3513 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3514 \ 3515 product(intx, Tier4InvocationThreshold, 5000, \ 3516 "Compile if number of method invocations crosses this " \ 3517 "threshold") \ 3518 \ 3519 product(intx, Tier4MinInvocationThreshold, 600, \ 3520 "Minimum invocation to compile at tier 4") \ 3521 \ 3522 product(intx, Tier4CompileThreshold, 15000, \ 3523 "Threshold at which tier 4 compilation is invoked (invocation " \ 3524 "minimum must be satisfied.") \ 3525 \ 3526 product(intx, Tier4BackEdgeThreshold, 40000, \ 3527 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3528 \ 3529 product(intx, Tier3DelayOn, 5, \ 3530 "If C2 queue size grows over this amount per compiler thread " \ 3531 "stop compiling at tier 3 and start compiling at tier 2") \ 3532 \ 3533 product(intx, Tier3DelayOff, 2, \ 3534 "If C2 queue size is less than this amount per compiler thread " \ 3535 "allow methods compiled at tier 2 transition to tier 3") \ 3536 \ 3537 product(intx, Tier3LoadFeedback, 5, \ 3538 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3539 "reaches this amount per compiler thread") \ 3540 \ 3541 product(intx, Tier4LoadFeedback, 3, \ 3542 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3543 "reaches this amount per compiler thread") \ 3544 \ 3545 product(intx, TieredCompileTaskTimeout, 50, \ 3546 "Kill compile task if method was not used within " \ 3547 "given timeout in milliseconds") \ 3548 \ 3549 product(intx, TieredStopAtLevel, 4, \ 3550 "Stop at given compilation level") \ 3551 \ 3552 product(intx, Tier0ProfilingStartPercentage, 200, \ 3553 "Start profiling in interpreter if the counters exceed tier 3" \ 3554 "thresholds by the specified percentage") \ 3555 \ 3556 product(intx, TieredRateUpdateMinTime, 1, \ 3557 "Minimum rate sampling interval (in milliseconds)") \ 3558 \ 3559 product(intx, TieredRateUpdateMaxTime, 25, \ 3560 "Maximum rate sampling interval (in milliseconds)") \ 3561 \ 3562 product_pd(bool, TieredCompilation, \ 3563 "Enable tiered compilation") \ 3564 \ 3565 product(bool, PrintTieredEvents, false, \ 3566 "Print tiered events notifications") \ 3567 \ 3568 product(bool, StressTieredRuntime, false, \ 3569 "Alternate client and server compiler on compile requests") \ 3570 \ 3571 product_pd(intx, OnStackReplacePercentage, \ 3572 "NON_TIERED number of method invocations/branches (expressed as %"\ 3573 "of CompileThreshold) before (re-)compiling OSR code") \ 3574 \ 3575 product(intx, InterpreterProfilePercentage, 33, \ 3576 "NON_TIERED number of method invocations/branches (expressed as %"\ 3577 "of CompileThreshold) before profiling in the interpreter") \ 3578 \ 3579 develop(intx, MaxRecompilationSearchLength, 10, \ 3580 "max. # frames to inspect searching for recompilee") \ 3581 \ 3582 develop(intx, MaxInterpretedSearchLength, 3, \ 3583 "max. # interp. frames to skip when searching for recompilee") \ 3584 \ 3585 develop(intx, DesiredMethodLimit, 8000, \ 3586 "desired max. method size (in bytecodes) after inlining") \ 3587 \ 3588 develop(intx, HugeMethodLimit, 8000, \ 3589 "don't compile methods larger than this if " \ 3590 "+DontCompileHugeMethods") \ 3591 \ 3592 /* New JDK 1.4 reflection implementation */ \ 3593 \ 3594 develop(bool, UseNewReflection, true, \ 3595 "Temporary flag for transition to reflection based on dynamic " \ 3596 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3597 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3598 "changes were needed") \ 3599 \ 3600 develop(bool, VerifyReflectionBytecodes, false, \ 3601 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3602 "in situations like that described in 4486457 or for " \ 3603 "constructors generated for serialization, so can not be enabled "\ 3604 "in product.") \ 3605 \ 3606 product(bool, ReflectionWrapResolutionErrors, true, \ 3607 "Temporary flag for transition to AbstractMethodError wrapped " \ 3608 "in InvocationTargetException. See 6531596") \ 3609 \ 3610 \ 3611 develop(intx, FastSuperclassLimit, 8, \ 3612 "Depth of hardwired instanceof accelerator array") \ 3613 \ 3614 /* Properties for Java libraries */ \ 3615 \ 3616 product(intx, MaxDirectMemorySize, -1, \ 3617 "Maximum total size of NIO direct-buffer allocations") \ 3618 \ 3619 /* temporary developer defined flags */ \ 3620 \ 3621 diagnostic(bool, UseNewCode, false, \ 3622 "Testing Only: Use the new version while testing") \ 3623 \ 3624 diagnostic(bool, UseNewCode2, false, \ 3625 "Testing Only: Use the new version while testing") \ 3626 \ 3627 diagnostic(bool, UseNewCode3, false, \ 3628 "Testing Only: Use the new version while testing") \ 3629 \ 3630 /* flags for performance data collection */ \ 3631 \ 3632 product(bool, UsePerfData, falseInEmbedded, \ 3633 "Flag to disable jvmstat instrumentation for performance testing" \ 3634 "and problem isolation purposes.") \ 3635 \ 3636 product(bool, PerfDataSaveToFile, false, \ 3637 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3638 \ 3639 product(ccstr, PerfDataSaveFile, NULL, \ 3640 "Save PerfData memory to the specified absolute pathname," \ 3641 "%p in the file name if present will be replaced by pid") \ 3642 \ 3643 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3644 "Data sampling interval in milliseconds") \ 3645 \ 3646 develop(bool, PerfTraceDataCreation, false, \ 3647 "Trace creation of Performance Data Entries") \ 3648 \ 3649 develop(bool, PerfTraceMemOps, false, \ 3650 "Trace PerfMemory create/attach/detach calls") \ 3651 \ 3652 product(bool, PerfDisableSharedMem, false, \ 3653 "Store performance data in standard memory") \ 3654 \ 3655 product(intx, PerfDataMemorySize, 32*K, \ 3656 "Size of performance data memory region. Will be rounded " \ 3657 "up to a multiple of the native os page size.") \ 3658 \ 3659 product(intx, PerfMaxStringConstLength, 1024, \ 3660 "Maximum PerfStringConstant string length before truncation") \ 3661 \ 3662 product(bool, PerfAllowAtExitRegistration, false, \ 3663 "Allow registration of atexit() methods") \ 3664 \ 3665 product(bool, PerfBypassFileSystemCheck, false, \ 3666 "Bypass Win32 file system criteria checks (Windows Only)") \ 3667 \ 3668 product(intx, UnguardOnExecutionViolation, 0, \ 3669 "Unguard page and retry on no-execute fault (Win32 only)" \ 3670 "0=off, 1=conservative, 2=aggressive") \ 3671 \ 3672 /* Serviceability Support */ \ 3673 \ 3674 product(bool, ManagementServer, false, \ 3675 "Create JMX Management Server") \ 3676 \ 3677 product(bool, DisableAttachMechanism, false, \ 3678 "Disable mechanism that allows tools to attach to this VM") \ 3679 \ 3680 product(bool, StartAttachListener, false, \ 3681 "Always start Attach Listener at VM startup") \ 3682 \ 3683 manageable(bool, PrintConcurrentLocks, false, \ 3684 "Print java.util.concurrent locks in thread dump") \ 3685 \ 3686 product(bool, TransmitErrorReport, false, \ 3687 "Enable error report transmission on erroneous termination") \ 3688 \ 3689 product(ccstr, ErrorReportServer, NULL, \ 3690 "Override built-in error report server address") \ 3691 \ 3692 /* Shared spaces */ \ 3693 \ 3694 product(bool, UseSharedSpaces, true, \ 3695 "Use shared spaces in the permanent generation") \ 3696 \ 3697 product(bool, RequireSharedSpaces, false, \ 3698 "Require shared spaces in the permanent generation") \ 3699 \ 3700 product(bool, DumpSharedSpaces, false, \ 3701 "Special mode: JVM reads a class list, loads classes, builds " \ 3702 "shared spaces, and dumps the shared spaces to a file to be " \ 3703 "used in future JVM runs.") \ 3704 \ 3705 product(bool, PrintSharedSpaces, false, \ 3706 "Print usage of shared spaces") \ 3707 \ 3708 product(uintx, SharedDummyBlockSize, 512*M, \ 3709 "Size of dummy block used to shift heap addresses (in bytes)") \ 3710 \ 3711 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3712 "Size of read-write space in permanent generation (in bytes)") \ 3713 \ 3714 product(uintx, SharedReadOnlySize, 10*M, \ 3715 "Size of read-only space in permanent generation (in bytes)") \ 3716 \ 3717 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3718 "Size of the shared data area adjacent to the heap (in bytes)") \ 3719 \ 3720 product(uintx, SharedMiscCodeSize, 4*M, \ 3721 "Size of the shared code area adjacent to the heap (in bytes)") \ 3722 \ 3723 diagnostic(bool, SharedOptimizeColdStart, true, \ 3724 "At dump time, order shared objects to achieve better " \ 3725 "cold startup time.") \ 3726 \ 3727 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3728 "Reordering policy for SharedOptimizeColdStart " \ 3729 "0=favor classload-time locality, 1=balanced, " \ 3730 "2=favor runtime locality") \ 3731 \ 3732 diagnostic(bool, SharedSkipVerify, false, \ 3733 "Skip assert() and verify() which page-in unwanted shared " \ 3734 "objects. ") \ 3735 \ 3736 diagnostic(bool, EnableInvokeDynamic, true, \ 3737 "support JSR 292 (method handles, invokedynamic, " \ 3738 "anonymous classes") \ 3739 \ 3740 product(bool, AnonymousClasses, false, \ 3741 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3742 \ 3743 experimental(bool, EnableMethodHandles, false, \ 3744 "support method handles (deprecated)") \ 3745 \ 3746 diagnostic(intx, MethodHandlePushLimit, 3, \ 3747 "number of additional stack slots a method handle may push") \ 3748 \ 3749 diagnostic(bool, PrintMethodHandleStubs, false, \ 3750 "Print generated stub code for method handles") \ 3751 \ 3752 develop(bool, TraceMethodHandles, false, \ 3753 "trace internal method handle operations") \ 3754 \ 3755 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3756 "perform extra checks when constructing method handles") \ 3757 \ 3758 diagnostic(bool, OptimizeMethodHandles, true, \ 3759 "when constructing method handles, try to improve them") \ 3760 \ 3761 develop(bool, StressMethodHandleWalk, false, \ 3762 "Process all method handles with MethodHandleWalk") \ 3763 \ 3764 diagnostic(bool, UseRicochetFrames, true, \ 3765 "use ricochet stack frames for method handle combination, " \ 3766 "if the platform supports them") \ 3767 \ 3768 experimental(bool, TrustFinalNonStaticFields, false, \ 3769 "trust final non-static declarations for constant folding") \ 3770 \ 3771 experimental(bool, AllowInvokeGeneric, false, \ 3772 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3773 "as equivalent methods") \ 3774 \ 3775 develop(bool, TraceInvokeDynamic, false, \ 3776 "trace internal invoke dynamic operations") \ 3777 \ 3778 diagnostic(bool, PauseAtStartup, false, \ 3779 "Causes the VM to pause at startup time and wait for the pause " \ 3780 "file to be removed (default: ./vm.paused.<pid>)") \ 3781 \ 3782 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3783 "The file to create and for whose removal to await when pausing " \ 3784 "at startup. (default: ./vm.paused.<pid>)") \ 3785 \ 3786 diagnostic(bool, PauseAtExit, false, \ 3787 "Pause and wait for keypress on exit if a debugger is attached") \ 3788 \ 3789 product(bool, ExtendedDTraceProbes, false, \ 3790 "Enable performance-impacting dtrace probes") \ 3791 \ 3792 product(bool, DTraceMethodProbes, false, \ 3793 "Enable dtrace probes for method-entry and method-exit") \ 3794 \ 3795 product(bool, DTraceAllocProbes, false, \ 3796 "Enable dtrace probes for object allocation") \ 3797 \ 3798 product(bool, DTraceMonitorProbes, false, \ 3799 "Enable dtrace probes for monitor events") \ 3800 \ 3801 product(bool, RelaxAccessControlCheck, false, \ 3802 "Relax the access control checks in the verifier") \ 3803 \ 3804 diagnostic(bool, PrintDTraceDOF, false, \ 3805 "Print the DTrace DOF passed to the system for JSDT probes") \ 3806 \ 3807 product(uintx, StringTableSize, 1009, \ 3808 "Number of buckets in the interned String table") \ 3809 \ 3810 product(bool, UseVMInterruptibleIO, false, \ 3811 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3812 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3813 " of this flag is true for JDK 6 and earliers") 3814 3815/* 3816 * Macros for factoring of globals 3817 */ 3818 3819// Interface macros 3820#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3821#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3822#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3823#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3824#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3825#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3826#ifdef PRODUCT 3827#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3828#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3829#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3830#else 3831#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3832#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3833#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3834#endif 3835// Special LP64 flags, product only needed for now. 3836#ifdef _LP64 3837#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3838#else 3839#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3840#endif // _LP64 3841 3842// Implementation macros 3843#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3844#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3845#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3846#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3847#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3848#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3849#ifdef PRODUCT 3850#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3851#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3852#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3853#else 3854#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3855#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3856#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3857#endif 3858#ifdef _LP64 3859#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3860#else 3861#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3862#endif // _LP64 3863 3864RUNTIME_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) 3865 3866RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3867 3868#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3869