globals.hpp revision 3065:0382d2b469b2
1132720Skan/* 2132720Skan * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. 3132720Skan * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4132720Skan * 5132720Skan * This code is free software; you can redistribute it and/or modify it 6132720Skan * under the terms of the GNU General Public License version 2 only, as 7132720Skan * published by the Free Software Foundation. 8132720Skan * 9132720Skan * This code is distributed in the hope that it will be useful, but WITHOUT 10132720Skan * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11132720Skan * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12132720Skan * version 2 for more details (a copy is included in the LICENSE file that 13132720Skan * accompanied this code). 14132720Skan * 15132720Skan * You should have received a copy of the GNU General Public License version 16132720Skan * 2 along with this work; if not, write to the Free Software Foundation, 17132720Skan * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18132720Skan * 19132720Skan * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20132720Skan * or visit www.oracle.com if you need additional information or have any 21132720Skan * questions. 22132720Skan * 23132720Skan */ 24132720Skan 25132720Skan#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26132720Skan#define SHARE_VM_RUNTIME_GLOBALS_HPP 27132720Skan 28132720Skan#include "utilities/debug.hpp" 29132720Skan 30132720Skan// use this for flags that are true per default in the tiered build 31132720Skan// but false in non-tiered builds, and vice versa 32132720Skan#ifdef TIERED 33132720Skan#define trueInTiered true 34132720Skan#define falseInTiered false 35132720Skan#else 36132720Skan#define trueInTiered false 37132720Skan#define falseInTiered true 38132720Skan#endif 39132720Skan 40132720Skan#ifdef TARGET_ARCH_x86 41132720Skan# include "globals_x86.hpp" 42132720Skan#endif 43132720Skan#ifdef TARGET_ARCH_sparc 44132720Skan# include "globals_sparc.hpp" 45132720Skan#endif 46132720Skan#ifdef TARGET_ARCH_zero 47132720Skan# include "globals_zero.hpp" 48132720Skan#endif 49132720Skan#ifdef TARGET_ARCH_arm 50132720Skan# include "globals_arm.hpp" 51132720Skan#endif 52132720Skan#ifdef TARGET_ARCH_ppc 53132720Skan# include "globals_ppc.hpp" 54132720Skan#endif 55132720Skan#ifdef TARGET_OS_FAMILY_linux 56132720Skan# include "globals_linux.hpp" 57132720Skan#endif 58132720Skan#ifdef TARGET_OS_FAMILY_solaris 59132720Skan# include "globals_solaris.hpp" 60132720Skan#endif 61132720Skan#ifdef TARGET_OS_FAMILY_windows 62132720Skan# include "globals_windows.hpp" 63132720Skan#endif 64132720Skan#ifdef TARGET_OS_FAMILY_bsd 65132720Skan# include "globals_bsd.hpp" 66132720Skan#endif 67132720Skan#ifdef TARGET_OS_ARCH_linux_x86 68132720Skan# include "globals_linux_x86.hpp" 69132720Skan#endif 70132720Skan#ifdef TARGET_OS_ARCH_linux_sparc 71132720Skan# include "globals_linux_sparc.hpp" 72132720Skan#endif 73132720Skan#ifdef TARGET_OS_ARCH_linux_zero 74132720Skan# include "globals_linux_zero.hpp" 75132720Skan#endif 76132720Skan#ifdef TARGET_OS_ARCH_solaris_x86 77132720Skan# include "globals_solaris_x86.hpp" 78132720Skan#endif 79132720Skan#ifdef TARGET_OS_ARCH_solaris_sparc 80132720Skan# include "globals_solaris_sparc.hpp" 81132720Skan#endif 82132720Skan#ifdef TARGET_OS_ARCH_windows_x86 83132720Skan# include "globals_windows_x86.hpp" 84132720Skan#endif 85132720Skan#ifdef TARGET_OS_ARCH_linux_arm 86132720Skan# include "globals_linux_arm.hpp" 87132720Skan#endif 88132720Skan#ifdef TARGET_OS_ARCH_linux_ppc 89132720Skan# include "globals_linux_ppc.hpp" 90132720Skan#endif 91132720Skan#ifdef TARGET_OS_ARCH_bsd_x86 92132720Skan# include "globals_bsd_x86.hpp" 93132720Skan#endif 94132720Skan#ifdef TARGET_OS_ARCH_bsd_zero 95132720Skan# include "globals_bsd_zero.hpp" 96132720Skan#endif 97132720Skan#ifdef COMPILER1 98132720Skan#ifdef TARGET_ARCH_x86 99132720Skan# include "c1_globals_x86.hpp" 100132720Skan#endif 101132720Skan#ifdef TARGET_ARCH_sparc 102132720Skan# include "c1_globals_sparc.hpp" 103132720Skan#endif 104132720Skan#ifdef TARGET_ARCH_arm 105132720Skan# include "c1_globals_arm.hpp" 106132720Skan#endif 107132720Skan#ifdef TARGET_ARCH_ppc 108132720Skan# include "c1_globals_ppc.hpp" 109132720Skan#endif 110132720Skan#ifdef TARGET_OS_FAMILY_linux 111132720Skan# include "c1_globals_linux.hpp" 112132720Skan#endif 113132720Skan#ifdef TARGET_OS_FAMILY_solaris 114132720Skan# include "c1_globals_solaris.hpp" 115132720Skan#endif 116132720Skan#ifdef TARGET_OS_FAMILY_windows 117132720Skan# include "c1_globals_windows.hpp" 118132720Skan#endif 119132720Skan#ifdef TARGET_OS_FAMILY_bsd 120132720Skan# include "c1_globals_bsd.hpp" 121132720Skan#endif 122132720Skan#endif 123132720Skan#ifdef COMPILER2 124132720Skan#ifdef TARGET_ARCH_x86 125132720Skan# include "c2_globals_x86.hpp" 126132720Skan#endif 127132720Skan#ifdef TARGET_ARCH_sparc 128132720Skan# include "c2_globals_sparc.hpp" 129132720Skan#endif 130132720Skan#ifdef TARGET_ARCH_arm 131132720Skan# include "c2_globals_arm.hpp" 132132720Skan#endif 133132720Skan#ifdef TARGET_OS_FAMILY_linux 134132720Skan# include "c2_globals_linux.hpp" 135132720Skan#endif 136132720Skan#ifdef TARGET_OS_FAMILY_solaris 137132720Skan# include "c2_globals_solaris.hpp" 138132720Skan#endif 139132720Skan#ifdef TARGET_OS_FAMILY_windows 140132720Skan# include "c2_globals_windows.hpp" 141132720Skan#endif 142132720Skan#ifdef TARGET_OS_FAMILY_bsd 143132720Skan# include "c2_globals_bsd.hpp" 144132720Skan#endif 145132720Skan#endif 146132720Skan#ifdef SHARK 147132720Skan#ifdef TARGET_ARCH_zero 148132720Skan# include "shark_globals_zero.hpp" 149132720Skan#endif 150132720Skan#endif 151132720Skan 152132720Skan#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 153132720Skandefine_pd_global(bool, BackgroundCompilation, false); 154132720Skandefine_pd_global(bool, UseTLAB, false); 155132720Skandefine_pd_global(bool, CICompileOSR, false); 156132720Skandefine_pd_global(bool, UseTypeProfile, false); 157132720Skandefine_pd_global(bool, UseOnStackReplacement, false); 158132720Skandefine_pd_global(bool, InlineIntrinsics, false); 159132720Skandefine_pd_global(bool, PreferInterpreterNativeStubs, true); 160132720Skandefine_pd_global(bool, ProfileInterpreter, false); 161132720Skandefine_pd_global(bool, ProfileTraps, false); 162132720Skandefine_pd_global(bool, TieredCompilation, false); 163132720Skan 164132720Skandefine_pd_global(intx, CompileThreshold, 0); 165132720Skandefine_pd_global(intx, BackEdgeThreshold, 0); 166132720Skan 167132720Skandefine_pd_global(intx, OnStackReplacePercentage, 0); 168132720Skandefine_pd_global(bool, ResizeTLAB, false); 169132720Skandefine_pd_global(intx, FreqInlineSize, 0); 170132720Skandefine_pd_global(intx, InlineSmallCode, 0); 171132720Skandefine_pd_global(intx, NewSizeThreadIncrease, 4*K); 172132720Skandefine_pd_global(intx, InlineClassNatives, true); 173132720Skandefine_pd_global(intx, InlineUnsafeOps, true); 174132720Skandefine_pd_global(intx, InitialCodeCacheSize, 160*K); 175132720Skandefine_pd_global(intx, ReservedCodeCacheSize, 32*M); 176132720Skandefine_pd_global(intx, CodeCacheExpansionSize, 32*K); 177132720Skandefine_pd_global(intx, CodeCacheMinBlockLength, 1); 178132720Skandefine_pd_global(uintx,PermSize, ScaleForWordSize(4*M)); 179132720Skandefine_pd_global(uintx,MaxPermSize, ScaleForWordSize(64*M)); 180132720Skandefine_pd_global(bool, NeverActAsServerClassMachine, true); 181132720Skandefine_pd_global(uint64_t,MaxRAM, 1ULL*G); 182132720Skan#define CI_COMPILER_COUNT 0 183132720Skan#else 184132720Skan 185132720Skan#ifdef COMPILER2 186132720Skan#define CI_COMPILER_COUNT 2 187132720Skan#else 188132720Skan#define CI_COMPILER_COUNT 1 189132720Skan#endif // COMPILER2 190132720Skan 191132720Skan#endif // no compilers 192132720Skan 193132720Skan 194132720Skan// string type aliases used only in this file 195132720Skantypedef const char* ccstr; 196132720Skantypedef const char* ccstrlist; // represents string arguments which accumulate 197132720Skan 198132720Skanenum FlagValueOrigin { 199132720Skan DEFAULT = 0, 200132720Skan COMMAND_LINE = 1, 201132720Skan ENVIRON_VAR = 2, 202132720Skan CONFIG_FILE = 3, 203132720Skan MANAGEMENT = 4, 204132720Skan ERGONOMIC = 5, 205146897Skan ATTACH_ON_DEMAND = 6, 206132720Skan INTERNAL = 99 207132720Skan}; 208132720Skan 209132720Skanstruct Flag { 210132720Skan const char *type; 211132720Skan const char *name; 212132720Skan void* addr; 213132720Skan 214132720Skan NOT_PRODUCT(const char *doc;) 215132720Skan 216132720Skan const char *kind; 217132720Skan FlagValueOrigin origin; 218132720Skan 219132720Skan // points to all Flags static array 220132720Skan static Flag *flags; 221132720Skan 222132720Skan // number of flags 223132720Skan static size_t numFlags; 224132720Skan 225132720Skan static Flag* find_flag(char* name, size_t length); 226132720Skan 227132720Skan bool is_bool() const { return strcmp(type, "bool") == 0; } 228132720Skan bool get_bool() const { return *((bool*) addr); } 229132720Skan void set_bool(bool value) { *((bool*) addr) = value; } 230132720Skan 231132720Skan bool is_intx() const { return strcmp(type, "intx") == 0; } 232132720Skan intx get_intx() const { return *((intx*) addr); } 233132720Skan void set_intx(intx value) { *((intx*) addr) = value; } 234146897Skan 235132720Skan bool is_uintx() const { return strcmp(type, "uintx") == 0; } 236132720Skan uintx get_uintx() const { return *((uintx*) addr); } 237132720Skan void set_uintx(uintx value) { *((uintx*) addr) = value; } 238132720Skan 239132720Skan bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 240132720Skan uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 241132720Skan void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 242132720Skan 243132720Skan bool is_double() const { return strcmp(type, "double") == 0; } 244132720Skan double get_double() const { return *((double*) addr); } 245132720Skan void set_double(double value) { *((double*) addr) = value; } 246132720Skan 247132720Skan bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 248132720Skan bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 249132720Skan ccstr get_ccstr() const { return *((ccstr*) addr); } 250132720Skan void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 251132720Skan 252132720Skan bool is_unlocker() const; 253132720Skan bool is_unlocked() const; 254132720Skan bool is_writeable() const; 255132720Skan bool is_external() const; 256132720Skan 257132720Skan bool is_unlocker_ext() const; 258132720Skan bool is_unlocked_ext() const; 259132720Skan bool is_writeable_ext() const; 260132720Skan bool is_external_ext() const; 261132720Skan 262132720Skan void print_on(outputStream* st, bool withComments = false ); 263132720Skan void print_as_flag(outputStream* st); 264132720Skan}; 265132720Skan 266132720Skan// debug flags control various aspects of the VM and are global accessible 267132720Skan 268132720Skan// use FlagSetting to temporarily change some debug flag 269132720Skan// e.g. FlagSetting fs(DebugThisAndThat, true); 270132720Skan// restored to previous value upon leaving scope 271132720Skanclass FlagSetting { 272132720Skan bool val; 273132720Skan bool* flag; 274132720Skan public: 275132720Skan FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 276132720Skan ~FlagSetting() { *flag = val; } 277132720Skan}; 278132720Skan 279132720Skan 280132720Skanclass CounterSetting { 281132720Skan intx* counter; 282132720Skan public: 283132720Skan CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 284132720Skan ~CounterSetting() { (*counter)--; } 285132720Skan}; 286132720Skan 287132720Skan 288132720Skanclass IntFlagSetting { 289132720Skan intx val; 290132720Skan intx* flag; 291132720Skan public: 292132720Skan IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 293132720Skan ~IntFlagSetting() { *flag = val; } 294132720Skan}; 295132720Skan 296132720Skan 297132720Skanclass DoubleFlagSetting { 298132720Skan double val; 299132720Skan double* flag; 300132720Skan public: 301132720Skan DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 302132720Skan ~DoubleFlagSetting() { *flag = val; } 303132720Skan}; 304132720Skan 305132720Skan 306132720Skanclass CommandLineFlags { 307132720Skan public: 308132720Skan static bool boolAt(char* name, size_t len, bool* value); 309132720Skan static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 310132720Skan static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 311132720Skan static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 312132720Skan 313132720Skan static bool intxAt(char* name, size_t len, intx* value); 314132720Skan static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 315132720Skan static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 316132720Skan static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 317132720Skan 318132720Skan static bool uintxAt(char* name, size_t len, uintx* value); 319132720Skan static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 320132720Skan static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 321132720Skan static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 322132720Skan 323132720Skan static bool uint64_tAt(char* name, size_t len, uint64_t* value); 324132720Skan static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 325132720Skan static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 326132720Skan static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 327132720Skan 328132720Skan static bool doubleAt(char* name, size_t len, double* value); 329132720Skan static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 330132720Skan static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 331132720Skan static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 332132720Skan 333132720Skan static bool ccstrAt(char* name, size_t len, ccstr* value); 334132720Skan static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 335132720Skan static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 336132720Skan static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 337132720Skan 338132720Skan // Returns false if name is not a command line flag. 339132720Skan static bool wasSetOnCmdline(const char* name, bool* value); 340132720Skan static void printSetFlags(outputStream* out); 341132720Skan 342132720Skan static void printFlags(outputStream* out, bool withComments); 343132720Skan 344132720Skan static void verify() PRODUCT_RETURN; 345132720Skan}; 346132720Skan 347132720Skan// use this for flags that are true by default in the debug version but 348132720Skan// false in the optimized version, and vice versa 349132720Skan#ifdef ASSERT 350132720Skan#define trueInDebug true 351132720Skan#define falseInDebug false 352132720Skan#else 353132720Skan#define trueInDebug false 354132720Skan#define falseInDebug true 355132720Skan#endif 356132720Skan 357132720Skan// use this for flags that are true per default in the product build 358132720Skan// but false in development builds, and vice versa 359132720Skan#ifdef PRODUCT 360132720Skan#define trueInProduct true 361132720Skan#define falseInProduct false 362132720Skan#else 363132720Skan#define trueInProduct false 364132720Skan#define falseInProduct true 365132720Skan#endif 366132720Skan 367132720Skan#ifdef JAVASE_EMBEDDED 368132720Skan#define falseInEmbedded false 369132720Skan#else 370132720Skan#define falseInEmbedded true 371132720Skan#endif 372132720Skan 373132720Skan// develop flags are settable / visible only during development and are constant in the PRODUCT version 374132720Skan// product flags are always settable / visible 375132720Skan// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 376132720Skan 377132720Skan// A flag must be declared with one of the following types: 378132720Skan// bool, intx, uintx, ccstr. 379132720Skan// The type "ccstr" is an alias for "const char*" and is used 380132720Skan// only in this file, because the macrology requires single-token type names. 381132720Skan 382132720Skan// Note: Diagnostic options not meant for VM tuning or for product modes. 383132720Skan// They are to be used for VM quality assurance or field diagnosis 384132720Skan// of VM bugs. They are hidden so that users will not be encouraged to 385132720Skan// try them as if they were VM ordinary execution options. However, they 386132720Skan// are available in the product version of the VM. Under instruction 387132720Skan// from support engineers, VM customers can turn them on to collect 388132720Skan// diagnostic information about VM problems. To use a VM diagnostic 389132720Skan// option, you must first specify +UnlockDiagnosticVMOptions. 390132720Skan// (This master switch also affects the behavior of -Xprintflags.) 391132720Skan// 392132720Skan// experimental flags are in support of features that are not 393132720Skan// part of the officially supported product, but are available 394132720Skan// for experimenting with. They could, for example, be performance 395132720Skan// features that may not have undergone full or rigorous QA, but which may 396132720Skan// help performance in some cases and released for experimentation 397132720Skan// by the community of users and developers. This flag also allows one to 398132720Skan// be able to build a fully supported product that nonetheless also 399132720Skan// ships with some unsupported, lightly tested, experimental features. 400132720Skan// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 401132720Skan// UnlockExperimentalVMOptions flag, which allows the control and 402132720Skan// modification of the experimental flags. 403132720Skan// 404132720Skan// Nota bene: neither diagnostic nor experimental options should be used casually, 405132720Skan// and they are not supported on production loads, except under explicit 406132720Skan// direction from support engineers. 407132720Skan// 408132720Skan// manageable flags are writeable external product flags. 409132720Skan// They are dynamically writeable through the JDK management interface 410132720Skan// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 411132720Skan// These flags are external exported interface (see CCC). The list of 412132720Skan// manageable flags can be queried programmatically through the management 413132720Skan// interface. 414132720Skan// 415132720Skan// A flag can be made as "manageable" only if 416132720Skan// - the flag is defined in a CCC as an external exported interface. 417132720Skan// - the VM implementation supports dynamic setting of the flag. 418132720Skan// This implies that the VM must *always* query the flag variable 419132720Skan// and not reuse state related to the flag state at any given time. 420132720Skan// - you want the flag to be queried programmatically by the customers. 421132720Skan// 422132720Skan// product_rw flags are writeable internal product flags. 423132720Skan// They are like "manageable" flags but for internal/private use. 424132720Skan// The list of product_rw flags are internal/private flags which 425132720Skan// may be changed/removed in a future release. It can be set 426132720Skan// through the management interface to get/set value 427132720Skan// when the name of flag is supplied. 428132720Skan// 429132720Skan// A flag can be made as "product_rw" only if 430132720Skan// - the VM implementation supports dynamic setting of the flag. 431132720Skan// This implies that the VM must *always* query the flag variable 432132720Skan// and not reuse state related to the flag state at any given time. 433132720Skan// 434132720Skan// Note that when there is a need to support develop flags to be writeable, 435132720Skan// it can be done in the same way as product_rw. 436132720Skan 437132720Skan#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 438132720Skan \ 439132720Skan lp64_product(bool, UseCompressedOops, false, \ 440132720Skan "Use 32-bit object references in 64-bit VM. " \ 441132720Skan "lp64_product means flag is always constant in 32 bit VM") \ 442132720Skan \ 443132720Skan notproduct(bool, CheckCompressedOops, true, \ 444132720Skan "generate checks in encoding/decoding code in debug VM") \ 445132720Skan \ 446132720Skan product_pd(uintx, HeapBaseMinAddress, \ 447132720Skan "OS specific low limit for heap base address") \ 448132720Skan \ 449132720Skan diagnostic(bool, PrintCompressedOopsMode, false, \ 450132720Skan "Print compressed oops base address and encoding mode") \ 451132720Skan \ 452132720Skan lp64_product(intx, ObjectAlignmentInBytes, 8, \ 453132720Skan "Default object alignment in bytes, 8 is minimum") \ 454132720Skan \ 455132720Skan /* UseMembar is theoretically a temp flag used for memory barrier \ 456132720Skan * removal testing. It was supposed to be removed before FCS but has \ 457132720Skan * been re-added (see 6401008) */ \ 458132720Skan product_pd(bool, UseMembar, \ 459132720Skan "(Unstable) Issues membars on thread state transitions") \ 460132720Skan \ 461132720Skan /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 462132720Skan * that don't support it. This will be replaced by processor detection \ 463132720Skan * logic. \ 464132720Skan */ \ 465132720Skan product(bool, UsePPCLWSYNC, true, \ 466132720Skan "Use lwsync instruction if true, else use slower sync") \ 467132720Skan \ 468132720Skan develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 469132720Skan "Whether to clean the chunk pool asynchronously") \ 470132720Skan \ 471132720Skan /* Temporary: See 6948537 */ \ 472132720Skan experimental(bool, UseMemSetInBOT, true, \ 473132720Skan "(Unstable) uses memset in BOT updates in GC code") \ 474132720Skan \ 475132720Skan diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 476132720Skan "Enable normal processing of flags relating to field diagnostics")\ 477132720Skan \ 478132720Skan experimental(bool, UnlockExperimentalVMOptions, false, \ 479132720Skan "Enable normal processing of flags relating to experimental features")\ 480132720Skan \ 481132720Skan product(bool, JavaMonitorsInStackTrace, true, \ 482132720Skan "Print info. about Java monitor locks when the stacks are dumped")\ 483132720Skan \ 484132720Skan product_pd(bool, UseLargePages, \ 485132720Skan "Use large page memory") \ 486132720Skan \ 487132720Skan product_pd(bool, UseLargePagesIndividualAllocation, \ 488132720Skan "Allocate large pages individually for better affinity") \ 489132720Skan \ 490132720Skan develop(bool, LargePagesIndividualAllocationInjectError, false, \ 491132720Skan "Fail large pages individual allocation") \ 492132720Skan \ 493132720Skan develop(bool, TracePageSizes, false, \ 494132720Skan "Trace page size selection and usage.") \ 495132720Skan \ 496132720Skan product(bool, UseNUMA, false, \ 497132720Skan "Use NUMA if available") \ 498132720Skan \ 499132720Skan product(bool, UseNUMAInterleaving, false, \ 500132720Skan "Interleave memory across NUMA nodes if available") \ 501132720Skan \ 502132720Skan product(uintx, NUMAInterleaveGranularity, 2*M, \ 503132720Skan "Granularity to use for NUMA interleaving on Windows OS") \ 504132720Skan \ 505132720Skan product(bool, ForceNUMA, false, \ 506132720Skan "Force NUMA optimizations on single-node/UMA systems") \ 507132720Skan \ 508132720Skan product(intx, NUMAChunkResizeWeight, 20, \ 509132720Skan "Percentage (0-100) used to weight the current sample when " \ 510132720Skan "computing exponentially decaying average for " \ 511132720Skan "AdaptiveNUMAChunkSizing") \ 512132720Skan \ 513132720Skan product(intx, NUMASpaceResizeRate, 1*G, \ 514132720Skan "Do not reallocate more that this amount per collection") \ 515132720Skan \ 516132720Skan product(bool, UseAdaptiveNUMAChunkSizing, true, \ 517132720Skan "Enable adaptive chunk sizing for NUMA") \ 518132720Skan \ 519132720Skan product(bool, NUMAStats, false, \ 520132720Skan "Print NUMA stats in detailed heap information") \ 521132720Skan \ 522132720Skan product(intx, NUMAPageScanRate, 256, \ 523132720Skan "Maximum number of pages to include in the page scan procedure") \ 524132720Skan \ 525132720Skan product_pd(bool, NeedsDeoptSuspend, \ 526132720Skan "True for register window machines (sparc/ia64)") \ 527 \ 528 product(intx, UseSSE, 99, \ 529 "Highest supported SSE instructions set on x86/x64") \ 530 \ 531 product(intx, UseAVX, 99, \ 532 "Highest supported AVX instructions set on x86/x64") \ 533 \ 534 product(intx, UseVIS, 99, \ 535 "Highest supported VIS instructions set on Sparc") \ 536 \ 537 product(uintx, LargePageSizeInBytes, 0, \ 538 "Large page size (0 to let VM choose the page size") \ 539 \ 540 product(uintx, LargePageHeapSizeThreshold, 128*M, \ 541 "Use large pages if max heap is at least this big") \ 542 \ 543 product(bool, ForceTimeHighResolution, false, \ 544 "Using high time resolution(For Win32 only)") \ 545 \ 546 develop(bool, TraceItables, false, \ 547 "Trace initialization and use of itables") \ 548 \ 549 develop(bool, TracePcPatching, false, \ 550 "Trace usage of frame::patch_pc") \ 551 \ 552 develop(bool, TraceJumps, false, \ 553 "Trace assembly jumps in thread ring buffer") \ 554 \ 555 develop(bool, TraceRelocator, false, \ 556 "Trace the bytecode relocator") \ 557 \ 558 develop(bool, TraceLongCompiles, false, \ 559 "Print out every time compilation is longer than " \ 560 "a given threashold") \ 561 \ 562 develop(bool, SafepointALot, false, \ 563 "Generates a lot of safepoints. Works with " \ 564 "GuaranteedSafepointInterval") \ 565 \ 566 product_pd(bool, BackgroundCompilation, \ 567 "A thread requesting compilation is not blocked during " \ 568 "compilation") \ 569 \ 570 product(bool, PrintVMQWaitTime, false, \ 571 "Prints out the waiting time in VM operation queue") \ 572 \ 573 develop(bool, BailoutToInterpreterForThrows, false, \ 574 "Compiled methods which throws/catches exceptions will be " \ 575 "deopt and intp.") \ 576 \ 577 develop(bool, NoYieldsInMicrolock, false, \ 578 "Disable yields in microlock") \ 579 \ 580 develop(bool, TraceOopMapGeneration, false, \ 581 "Shows oopmap generation") \ 582 \ 583 product(bool, MethodFlushing, true, \ 584 "Reclamation of zombie and not-entrant methods") \ 585 \ 586 develop(bool, VerifyStack, false, \ 587 "Verify stack of each thread when it is entering a runtime call") \ 588 \ 589 diagnostic(bool, ForceUnreachable, false, \ 590 "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 591 \ 592 notproduct(bool, StressDerivedPointers, false, \ 593 "Force scavenge when a derived pointers is detected on stack " \ 594 "after rtm call") \ 595 \ 596 develop(bool, TraceDerivedPointers, false, \ 597 "Trace traversal of derived pointers on stack") \ 598 \ 599 notproduct(bool, TraceCodeBlobStacks, false, \ 600 "Trace stack-walk of codeblobs") \ 601 \ 602 product(bool, PrintJNIResolving, false, \ 603 "Used to implement -v:jni") \ 604 \ 605 notproduct(bool, PrintRewrites, false, \ 606 "Print methods that are being rewritten") \ 607 \ 608 product(bool, UseInlineCaches, true, \ 609 "Use Inline Caches for virtual calls ") \ 610 \ 611 develop(bool, InlineArrayCopy, true, \ 612 "inline arraycopy native that is known to be part of " \ 613 "base library DLL") \ 614 \ 615 develop(bool, InlineObjectHash, true, \ 616 "inline Object::hashCode() native that is known to be part " \ 617 "of base library DLL") \ 618 \ 619 develop(bool, InlineObjectCopy, true, \ 620 "inline Object.clone and Arrays.copyOf[Range] intrinsics") \ 621 \ 622 develop(bool, InlineNatives, true, \ 623 "inline natives that are known to be part of base library DLL") \ 624 \ 625 develop(bool, InlineMathNatives, true, \ 626 "inline SinD, CosD, etc.") \ 627 \ 628 develop(bool, InlineClassNatives, true, \ 629 "inline Class.isInstance, etc") \ 630 \ 631 develop(bool, InlineAtomicLong, true, \ 632 "inline sun.misc.AtomicLong") \ 633 \ 634 develop(bool, InlineThreadNatives, true, \ 635 "inline Thread.currentThread, etc") \ 636 \ 637 develop(bool, InlineReflectionGetCallerClass, true, \ 638 "inline sun.reflect.Reflection.getCallerClass(), known to be part "\ 639 "of base library DLL") \ 640 \ 641 develop(bool, InlineUnsafeOps, true, \ 642 "inline memory ops (native methods) from sun.misc.Unsafe") \ 643 \ 644 develop(bool, ConvertCmpD2CmpF, true, \ 645 "Convert cmpD to cmpF when one input is constant in float range") \ 646 \ 647 develop(bool, ConvertFloat2IntClipping, true, \ 648 "Convert float2int clipping idiom to integer clipping") \ 649 \ 650 develop(bool, SpecialStringCompareTo, true, \ 651 "special version of string compareTo") \ 652 \ 653 develop(bool, SpecialStringIndexOf, true, \ 654 "special version of string indexOf") \ 655 \ 656 develop(bool, SpecialStringEquals, true, \ 657 "special version of string equals") \ 658 \ 659 develop(bool, SpecialArraysEquals, true, \ 660 "special version of Arrays.equals(char[],char[])") \ 661 \ 662 product(bool, CriticalJNINatives, true, \ 663 "check for critical JNI entry points") \ 664 \ 665 notproduct(bool, StressCriticalJNINatives, false, \ 666 "Exercise register saving code in critical natives") \ 667 \ 668 product(bool, UseSSE42Intrinsics, false, \ 669 "SSE4.2 versions of intrinsics") \ 670 \ 671 product(bool, UseCondCardMark, false, \ 672 "Check for already marked card before updating card table") \ 673 \ 674 develop(bool, TraceCallFixup, false, \ 675 "traces all call fixups") \ 676 \ 677 develop(bool, DeoptimizeALot, false, \ 678 "deoptimize at every exit from the runtime system") \ 679 \ 680 notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 681 "a comma separated list of bcis to deoptimize at") \ 682 \ 683 product(bool, DeoptimizeRandom, false, \ 684 "deoptimize random frames on random exit from the runtime system")\ 685 \ 686 notproduct(bool, ZombieALot, false, \ 687 "creates zombies (non-entrant) at exit from the runt. system") \ 688 \ 689 product(bool, UnlinkSymbolsALot, false, \ 690 "unlink unreferenced symbols from the symbol table at safepoints")\ 691 \ 692 notproduct(bool, WalkStackALot, false, \ 693 "trace stack (no print) at every exit from the runtime system") \ 694 \ 695 product(bool, Debugging, false, \ 696 "set when executing debug methods in debug.ccp " \ 697 "(to prevent triggering assertions)") \ 698 \ 699 notproduct(bool, StrictSafepointChecks, trueInDebug, \ 700 "Enable strict checks that safepoints cannot happen for threads " \ 701 "that used No_Safepoint_Verifier") \ 702 \ 703 notproduct(bool, VerifyLastFrame, false, \ 704 "Verify oops on last frame on entry to VM") \ 705 \ 706 develop(bool, TraceHandleAllocation, false, \ 707 "Prints out warnings when suspicious many handles are allocated") \ 708 \ 709 product(bool, UseCompilerSafepoints, true, \ 710 "Stop at safepoints in compiled code") \ 711 \ 712 product(bool, UseSplitVerifier, true, \ 713 "use split verifier with StackMapTable attributes") \ 714 \ 715 product(bool, FailOverToOldVerifier, true, \ 716 "fail over to old verifier when split verifier fails") \ 717 \ 718 develop(bool, ShowSafepointMsgs, false, \ 719 "Show msg. about safepoint synch.") \ 720 \ 721 product(bool, SafepointTimeout, false, \ 722 "Time out and warn or fail after SafepointTimeoutDelay " \ 723 "milliseconds if failed to reach safepoint") \ 724 \ 725 develop(bool, DieOnSafepointTimeout, false, \ 726 "Die upon failure to reach safepoint (see SafepointTimeout)") \ 727 \ 728 /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 729 /* typically, at most a few retries are needed */ \ 730 product(intx, SuspendRetryCount, 50, \ 731 "Maximum retry count for an external suspend request") \ 732 \ 733 product(intx, SuspendRetryDelay, 5, \ 734 "Milliseconds to delay per retry (* current_retry_count)") \ 735 \ 736 product(bool, AssertOnSuspendWaitFailure, false, \ 737 "Assert/Guarantee on external suspend wait failure") \ 738 \ 739 product(bool, TraceSuspendWaitFailures, false, \ 740 "Trace external suspend wait failures") \ 741 \ 742 product(bool, MaxFDLimit, true, \ 743 "Bump the number of file descriptors to max in solaris.") \ 744 \ 745 diagnostic(bool, LogEvents, true, \ 746 "Enable the various ring buffer event logs") \ 747 \ 748 diagnostic(intx, LogEventsBufferEntries, 10, \ 749 "Enable the various ring buffer event logs") \ 750 \ 751 product(bool, BytecodeVerificationRemote, true, \ 752 "Enables the Java bytecode verifier for remote classes") \ 753 \ 754 product(bool, BytecodeVerificationLocal, false, \ 755 "Enables the Java bytecode verifier for local classes") \ 756 \ 757 develop(bool, ForceFloatExceptions, trueInDebug, \ 758 "Force exceptions on FP stack under/overflow") \ 759 \ 760 develop(bool, SoftMatchFailure, trueInProduct, \ 761 "If the DFA fails to match a node, print a message and bail out") \ 762 \ 763 develop(bool, VerifyStackAtCalls, false, \ 764 "Verify that the stack pointer is unchanged after calls") \ 765 \ 766 develop(bool, TraceJavaAssertions, false, \ 767 "Trace java language assertions") \ 768 \ 769 notproduct(bool, CheckAssertionStatusDirectives, false, \ 770 "temporary - see javaClasses.cpp") \ 771 \ 772 notproduct(bool, PrintMallocFree, false, \ 773 "Trace calls to C heap malloc/free allocation") \ 774 \ 775 product(bool, PrintOopAddress, false, \ 776 "Always print the location of the oop") \ 777 \ 778 notproduct(bool, VerifyCodeCacheOften, false, \ 779 "Verify compiled-code cache often") \ 780 \ 781 develop(bool, ZapDeadCompiledLocals, false, \ 782 "Zap dead locals in compiler frames") \ 783 \ 784 notproduct(bool, ZapDeadLocalsOld, false, \ 785 "Zap dead locals (old version, zaps all frames when " \ 786 "entering the VM") \ 787 \ 788 notproduct(bool, CheckOopishValues, false, \ 789 "Warn if value contains oop ( requires ZapDeadLocals)") \ 790 \ 791 develop(bool, UseMallocOnly, false, \ 792 "use only malloc/free for allocation (no resource area/arena)") \ 793 \ 794 develop(bool, PrintMalloc, false, \ 795 "print all malloc/free calls") \ 796 \ 797 develop(bool, PrintMallocStatistics, false, \ 798 "print malloc/free statistics") \ 799 \ 800 develop(bool, ZapResourceArea, trueInDebug, \ 801 "Zap freed resource/arena space with 0xABABABAB") \ 802 \ 803 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 804 "Zap freed VM handle space with 0xBCBCBCBC") \ 805 \ 806 develop(bool, ZapJNIHandleArea, trueInDebug, \ 807 "Zap freed JNI handle space with 0xFEFEFEFE") \ 808 \ 809 notproduct(bool, ZapStackSegments, trueInDebug, \ 810 "Zap allocated/freed Stack segments with 0xFADFADED") \ 811 \ 812 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 813 "Zap unused heap space with 0xBAADBABE") \ 814 \ 815 develop(bool, TraceZapUnusedHeapArea, false, \ 816 "Trace zapping of unused heap space") \ 817 \ 818 develop(bool, CheckZapUnusedHeapArea, false, \ 819 "Check zapping of unused heap space") \ 820 \ 821 develop(bool, ZapFillerObjects, trueInDebug, \ 822 "Zap filler objects with 0xDEAFBABE") \ 823 \ 824 develop(bool, PrintVMMessages, true, \ 825 "Print vm messages on console") \ 826 \ 827 product(bool, PrintGCApplicationConcurrentTime, false, \ 828 "Print the time the application has been running") \ 829 \ 830 product(bool, PrintGCApplicationStoppedTime, false, \ 831 "Print the time the application has been stopped") \ 832 \ 833 notproduct(uintx, ErrorHandlerTest, 0, \ 834 "If > 0, provokes an error after VM initialization; the value" \ 835 "determines which error to provoke. See test_error_handler()" \ 836 "in debug.cpp.") \ 837 \ 838 develop(bool, Verbose, false, \ 839 "Prints additional debugging information from other modes") \ 840 \ 841 develop(bool, PrintMiscellaneous, false, \ 842 "Prints uncategorized debugging information (requires +Verbose)") \ 843 \ 844 develop(bool, WizardMode, false, \ 845 "Prints much more debugging information") \ 846 \ 847 product(bool, ShowMessageBoxOnError, false, \ 848 "Keep process alive on VM fatal error") \ 849 \ 850 product(bool, CreateMinidumpOnCrash, false, \ 851 "Create minidump on VM fatal error") \ 852 \ 853 product_pd(bool, UseOSErrorReporting, \ 854 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 855 \ 856 product(bool, SuppressFatalErrorMessage, false, \ 857 "Do NO Fatal Error report [Avoid deadlock]") \ 858 \ 859 product(ccstrlist, OnError, "", \ 860 "Run user-defined commands on fatal error; see VMError.cpp " \ 861 "for examples") \ 862 \ 863 product(ccstrlist, OnOutOfMemoryError, "", \ 864 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 865 \ 866 manageable(bool, HeapDumpBeforeFullGC, false, \ 867 "Dump heap to file before any major stop-world GC") \ 868 \ 869 manageable(bool, HeapDumpAfterFullGC, false, \ 870 "Dump heap to file after any major stop-world GC") \ 871 \ 872 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 873 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 874 \ 875 manageable(ccstr, HeapDumpPath, NULL, \ 876 "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 877 "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 878 "in the working directory)") \ 879 \ 880 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 881 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 882 "when the heap usage is larger than this") \ 883 \ 884 develop(uintx, HeapDumpSegmentSize, 1*G, \ 885 "Approximate segment size when generating a segmented heap dump") \ 886 \ 887 develop(bool, BreakAtWarning, false, \ 888 "Execute breakpoint upon encountering VM warning") \ 889 \ 890 product_pd(bool, UseVectoredExceptions, \ 891 "Temp Flag - Use Vectored Exceptions rather than SEH (Windows Only)") \ 892 \ 893 develop(bool, TraceVMOperation, false, \ 894 "Trace vm operations") \ 895 \ 896 develop(bool, UseFakeTimers, false, \ 897 "Tells whether the VM should use system time or a fake timer") \ 898 \ 899 diagnostic(bool, LogCompilation, false, \ 900 "Log compilation activity in detail to hotspot.log or LogFile") \ 901 \ 902 product(bool, PrintCompilation, false, \ 903 "Print compilations") \ 904 \ 905 diagnostic(bool, TraceNMethodInstalls, false, \ 906 "Trace nmethod intallation") \ 907 \ 908 diagnostic(intx, ScavengeRootsInCode, 2, \ 909 "0: do not allow scavengable oops in the code cache; " \ 910 "1: allow scavenging from the code cache; " \ 911 "2: emit as many constants as the compiler can see") \ 912 \ 913 diagnostic(bool, TraceOSRBreakpoint, false, \ 914 "Trace OSR Breakpoint ") \ 915 \ 916 diagnostic(bool, TraceCompileTriggered, false, \ 917 "Trace compile triggered") \ 918 \ 919 diagnostic(bool, TraceTriggers, false, \ 920 "Trace triggers") \ 921 \ 922 product(bool, AlwaysRestoreFPU, false, \ 923 "Restore the FPU control word after every JNI call (expensive)") \ 924 \ 925 diagnostic(bool, PrintCompilation2, false, \ 926 "Print additional statistics per compilation") \ 927 \ 928 diagnostic(bool, PrintAdapterHandlers, false, \ 929 "Print code generated for i2c/c2i adapters") \ 930 \ 931 develop(bool, VerifyAdapterSharing, false, \ 932 "Verify that the code for shared adapters is the equivalent") \ 933 \ 934 diagnostic(bool, PrintAssembly, false, \ 935 "Print assembly code (using external disassembler.so)") \ 936 \ 937 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 938 "Options string passed to disassembler.so") \ 939 \ 940 diagnostic(bool, PrintNMethods, false, \ 941 "Print assembly code for nmethods when generated") \ 942 \ 943 diagnostic(bool, PrintNativeNMethods, false, \ 944 "Print assembly code for native nmethods when generated") \ 945 \ 946 develop(bool, PrintDebugInfo, false, \ 947 "Print debug information for all nmethods when generated") \ 948 \ 949 develop(bool, PrintRelocations, false, \ 950 "Print relocation information for all nmethods when generated") \ 951 \ 952 develop(bool, PrintDependencies, false, \ 953 "Print dependency information for all nmethods when generated") \ 954 \ 955 develop(bool, PrintExceptionHandlers, false, \ 956 "Print exception handler tables for all nmethods when generated") \ 957 \ 958 develop(bool, InterceptOSException, false, \ 959 "Starts debugger when an implicit OS (e.g., NULL) " \ 960 "exception happens") \ 961 \ 962 notproduct(bool, PrintCodeCache, false, \ 963 "Print the compiled_code cache when exiting") \ 964 \ 965 develop(bool, PrintCodeCache2, false, \ 966 "Print detailed info on the compiled_code cache when exiting") \ 967 \ 968 diagnostic(bool, PrintStubCode, false, \ 969 "Print generated stub code") \ 970 \ 971 product(bool, StackTraceInThrowable, true, \ 972 "Collect backtrace in throwable when exception happens") \ 973 \ 974 product(bool, OmitStackTraceInFastThrow, true, \ 975 "Omit backtraces for some 'hot' exceptions in optimized code") \ 976 \ 977 product(bool, ProfilerPrintByteCodeStatistics, false, \ 978 "Prints byte code statictics when dumping profiler output") \ 979 \ 980 product(bool, ProfilerRecordPC, false, \ 981 "Collects tick for each 16 byte interval of compiled code") \ 982 \ 983 product(bool, ProfileVM, false, \ 984 "Profiles ticks that fall within VM (either in the VM Thread " \ 985 "or VM code called through stubs)") \ 986 \ 987 product(bool, ProfileIntervals, false, \ 988 "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 989 \ 990 notproduct(bool, ProfilerCheckIntervals, false, \ 991 "Collect and print info on spacing of profiler ticks") \ 992 \ 993 develop(bool, PrintJVMWarnings, false, \ 994 "Prints warnings for unimplemented JVM functions") \ 995 \ 996 product(bool, PrintWarnings, true, \ 997 "Prints JVM warnings to output stream") \ 998 \ 999 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1000 "Prints warnings for stalled SpinLocks") \ 1001 \ 1002 develop(bool, InitializeJavaLangSystem, true, \ 1003 "Initialize java.lang.System - turn off for individual " \ 1004 "method debugging") \ 1005 \ 1006 develop(bool, InitializeJavaLangString, true, \ 1007 "Initialize java.lang.String - turn off for individual " \ 1008 "method debugging") \ 1009 \ 1010 develop(bool, InitializeJavaLangExceptionsErrors, true, \ 1011 "Initialize various error and exception classes - turn off for " \ 1012 "individual method debugging") \ 1013 \ 1014 product(bool, RegisterFinalizersAtInit, true, \ 1015 "Register finalizable objects at end of Object.<init> or " \ 1016 "after allocation") \ 1017 \ 1018 develop(bool, RegisterReferences, true, \ 1019 "Tells whether the VM should register soft/weak/final/phantom " \ 1020 "references") \ 1021 \ 1022 develop(bool, IgnoreRewrites, false, \ 1023 "Supress rewrites of bytecodes in the oopmap generator. " \ 1024 "This is unsafe!") \ 1025 \ 1026 develop(bool, PrintCodeCacheExtension, false, \ 1027 "Print extension of code cache") \ 1028 \ 1029 develop(bool, UsePrivilegedStack, true, \ 1030 "Enable the security JVM functions") \ 1031 \ 1032 develop(bool, IEEEPrecision, true, \ 1033 "Enables IEEE precision (for INTEL only)") \ 1034 \ 1035 develop(bool, ProtectionDomainVerification, true, \ 1036 "Verifies protection domain before resolution in system " \ 1037 "dictionary") \ 1038 \ 1039 product(bool, ClassUnloading, true, \ 1040 "Do unloading of classes") \ 1041 \ 1042 diagnostic(bool, LinkWellKnownClasses, false, \ 1043 "Resolve a well known class as soon as its name is seen") \ 1044 \ 1045 develop(bool, DisableStartThread, false, \ 1046 "Disable starting of additional Java threads " \ 1047 "(for debugging only)") \ 1048 \ 1049 develop(bool, MemProfiling, false, \ 1050 "Write memory usage profiling to log file") \ 1051 \ 1052 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1053 "Prints the system dictionary at exit") \ 1054 \ 1055 diagnostic(bool, UnsyncloadClass, false, \ 1056 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1057 "class loader must call VM synchronized for findClass " \ 1058 "and defineClass.") \ 1059 \ 1060 product(bool, AlwaysLockClassLoader, false, \ 1061 "Require the VM to acquire the class loader lock before calling " \ 1062 "loadClass() even for class loaders registering " \ 1063 "as parallel capable") \ 1064 \ 1065 product(bool, AllowParallelDefineClass, false, \ 1066 "Allow parallel defineClass requests for class loaders " \ 1067 "registering as parallel capable") \ 1068 \ 1069 product(bool, MustCallLoadClassInternal, false, \ 1070 "Call loadClassInternal() rather than loadClass()") \ 1071 \ 1072 product_pd(bool, DontYieldALot, \ 1073 "Throw away obvious excess yield calls (for SOLARIS only)") \ 1074 \ 1075 product_pd(bool, ConvertSleepToYield, \ 1076 "Converts sleep(0) to thread yield " \ 1077 "(may be off for SOLARIS to improve GUI)") \ 1078 \ 1079 product(bool, ConvertYieldToSleep, false, \ 1080 "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1081 "behavior (SOLARIS only)") \ 1082 \ 1083 product(bool, UseBoundThreads, true, \ 1084 "Bind user level threads to kernel threads (for SOLARIS only)") \ 1085 \ 1086 develop(bool, UseDetachedThreads, true, \ 1087 "Use detached threads that are recycled upon termination " \ 1088 "(for SOLARIS only)") \ 1089 \ 1090 product(bool, UseLWPSynchronization, true, \ 1091 "Use LWP-based instead of libthread-based synchronization " \ 1092 "(SPARC only)") \ 1093 \ 1094 product(ccstr, SyncKnobs, NULL, \ 1095 "(Unstable) Various monitor synchronization tunables") \ 1096 \ 1097 product(intx, EmitSync, 0, \ 1098 "(Unsafe,Unstable) " \ 1099 " Controls emission of inline sync fast-path code") \ 1100 \ 1101 product(intx, AlwaysInflate, 0, "(Unstable) Force inflation") \ 1102 \ 1103 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1104 \ 1105 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1106 \ 1107 product(intx, Atomics, 0, \ 1108 "(Unsafe,Unstable) Diagnostic - Controls emission of atomics") \ 1109 \ 1110 product(intx, FenceInstruction, 0, \ 1111 "(Unsafe,Unstable) Experimental") \ 1112 \ 1113 product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1114 \ 1115 product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1116 \ 1117 product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1118 \ 1119 product(intx, hashCode, 0, \ 1120 "(Unstable) select hashCode generation algorithm" ) \ 1121 \ 1122 product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1123 "(Unstable, Linux-specific)" \ 1124 " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1125 \ 1126 product(bool, FilterSpuriousWakeups, true, \ 1127 "Prevent spurious or premature wakeups from object.wait " \ 1128 "(Solaris only)") \ 1129 \ 1130 product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1131 product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1132 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1133 \ 1134 develop(bool, UsePthreads, false, \ 1135 "Use pthread-based instead of libthread-based synchronization " \ 1136 "(SPARC only)") \ 1137 \ 1138 product(bool, AdjustConcurrency, false, \ 1139 "call thr_setconcurrency at thread create time to avoid " \ 1140 "LWP starvation on MP systems (For Solaris Only)") \ 1141 \ 1142 develop(bool, UpdateHotSpotCompilerFileOnError, true, \ 1143 "Should the system attempt to update the compiler file when " \ 1144 "an error occurs?") \ 1145 \ 1146 product(bool, ReduceSignalUsage, false, \ 1147 "Reduce the use of OS signals in Java and/or the VM") \ 1148 \ 1149 notproduct(bool, ValidateMarkSweep, false, \ 1150 "Do extra validation during MarkSweep collection") \ 1151 \ 1152 notproduct(bool, RecordMarkSweepCompaction, false, \ 1153 "Enable GC-to-GC recording and querying of compaction during " \ 1154 "MarkSweep") \ 1155 \ 1156 develop_pd(bool, ShareVtableStubs, \ 1157 "Share vtable stubs (smaller code but worse branch prediction") \ 1158 \ 1159 develop(bool, LoadLineNumberTables, true, \ 1160 "Tells whether the class file parser loads line number tables") \ 1161 \ 1162 develop(bool, LoadLocalVariableTables, true, \ 1163 "Tells whether the class file parser loads local variable tables")\ 1164 \ 1165 develop(bool, LoadLocalVariableTypeTables, true, \ 1166 "Tells whether the class file parser loads local variable type tables")\ 1167 \ 1168 product(bool, AllowUserSignalHandlers, false, \ 1169 "Do not complain if the application installs signal handlers " \ 1170 "(Solaris & Linux only)") \ 1171 \ 1172 product(bool, UseSignalChaining, true, \ 1173 "Use signal-chaining to invoke signal handlers installed " \ 1174 "by the application (Solaris & Linux only)") \ 1175 \ 1176 product(bool, UseAltSigs, false, \ 1177 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1178 "internal signals (Solaris only)") \ 1179 \ 1180 product(bool, UseSpinning, false, \ 1181 "Use spinning in monitor inflation and before entry") \ 1182 \ 1183 product(bool, PreSpinYield, false, \ 1184 "Yield before inner spinning loop") \ 1185 \ 1186 product(bool, PostSpinYield, true, \ 1187 "Yield after inner spinning loop") \ 1188 \ 1189 product(bool, AllowJNIEnvProxy, false, \ 1190 "Allow JNIEnv proxies for jdbx") \ 1191 \ 1192 product(bool, JNIDetachReleasesMonitors, true, \ 1193 "JNI DetachCurrentThread releases monitors owned by thread") \ 1194 \ 1195 product(bool, RestoreMXCSROnJNICalls, false, \ 1196 "Restore MXCSR when returning from JNI calls") \ 1197 \ 1198 product(bool, CheckJNICalls, false, \ 1199 "Verify all arguments to JNI calls") \ 1200 \ 1201 product(bool, UseFastJNIAccessors, true, \ 1202 "Use optimized versions of Get<Primitive>Field") \ 1203 \ 1204 product(bool, EagerXrunInit, false, \ 1205 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1206 " but not all -Xrun libraries may support the state of the VM at this time") \ 1207 \ 1208 product(bool, PreserveAllAnnotations, false, \ 1209 "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1210 \ 1211 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1212 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1213 \ 1214 product(bool, LazyBootClassLoader, true, \ 1215 "Enable/disable lazy opening of boot class path entries") \ 1216 \ 1217 diagnostic(bool, UseIncDec, true, \ 1218 "Use INC, DEC instructions on x86") \ 1219 \ 1220 product(bool, UseNewLongLShift, false, \ 1221 "Use optimized bitwise shift left") \ 1222 \ 1223 product(bool, UseStoreImmI16, true, \ 1224 "Use store immediate 16-bits value instruction on x86") \ 1225 \ 1226 product(bool, UseAddressNop, false, \ 1227 "Use '0F 1F [addr]' NOP instructions on x86 cpus") \ 1228 \ 1229 product(bool, UseXmmLoadAndClearUpper, true, \ 1230 "Load low part of XMM register and clear upper part") \ 1231 \ 1232 product(bool, UseXmmRegToRegMoveAll, false, \ 1233 "Copy all XMM register bits when moving value between registers") \ 1234 \ 1235 product(bool, UseXmmI2D, false, \ 1236 "Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \ 1237 \ 1238 product(bool, UseXmmI2F, false, \ 1239 "Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \ 1240 \ 1241 product(bool, UseXMMForArrayCopy, false, \ 1242 "Use SSE2 MOVQ instruction for Arraycopy") \ 1243 \ 1244 product(bool, UseUnalignedLoadStores, false, \ 1245 "Use SSE2 MOVDQU instruction for Arraycopy") \ 1246 \ 1247 product(bool, UseCBCond, false, \ 1248 "Use compare and branch instruction on SPARC") \ 1249 \ 1250 product(intx, FieldsAllocationStyle, 1, \ 1251 "0 - type based with oops first, 1 - with oops last, " \ 1252 "2 - oops in super and sub classes are together") \ 1253 \ 1254 product(bool, CompactFields, true, \ 1255 "Allocate nonstatic fields in gaps between previous fields") \ 1256 \ 1257 notproduct(bool, PrintCompactFieldsSavings, false, \ 1258 "Print how many words were saved with CompactFields") \ 1259 \ 1260 product(bool, UseBiasedLocking, true, \ 1261 "Enable biased locking in JVM") \ 1262 \ 1263 product(intx, BiasedLockingStartupDelay, 4000, \ 1264 "Number of milliseconds to wait before enabling biased locking") \ 1265 \ 1266 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1267 "Print statistics of biased locking in JVM") \ 1268 \ 1269 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1270 "Threshold of number of revocations per type to try to " \ 1271 "rebias all objects in the heap of that type") \ 1272 \ 1273 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1274 "Threshold of number of revocations per type to permanently " \ 1275 "revoke biases of all objects in the heap of that type") \ 1276 \ 1277 product(intx, BiasedLockingDecayTime, 25000, \ 1278 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1279 "type after previous bulk rebias") \ 1280 \ 1281 develop(bool, JavaObjectsInPerm, false, \ 1282 "controls whether Classes and interned Strings are allocated" \ 1283 "in perm. This purely intended to allow debugging issues" \ 1284 "in production.") \ 1285 \ 1286 /* tracing */ \ 1287 \ 1288 notproduct(bool, TraceRuntimeCalls, false, \ 1289 "Trace run-time calls") \ 1290 \ 1291 develop(bool, TraceJNICalls, false, \ 1292 "Trace JNI calls") \ 1293 \ 1294 notproduct(bool, TraceJVMCalls, false, \ 1295 "Trace JVM calls") \ 1296 \ 1297 product(ccstr, TraceJVMTI, NULL, \ 1298 "Trace flags for JVMTI functions and events") \ 1299 \ 1300 /* This option can change an EMCP method into an obsolete method. */ \ 1301 /* This can affect tests that except specific methods to be EMCP. */ \ 1302 /* This option should be used with caution. */ \ 1303 product(bool, StressLdcRewrite, false, \ 1304 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1305 \ 1306 product(intx, TraceRedefineClasses, 0, \ 1307 "Trace level for JVMTI RedefineClasses") \ 1308 \ 1309 develop(bool, StressMethodComparator, false, \ 1310 "run the MethodComparator on all loaded methods") \ 1311 \ 1312 /* change to false by default sometime after Mustang */ \ 1313 product(bool, VerifyMergedCPBytecodes, true, \ 1314 "Verify bytecodes after RedefineClasses constant pool merging") \ 1315 \ 1316 develop(bool, TraceJNIHandleAllocation, false, \ 1317 "Trace allocation/deallocation of JNI handle blocks") \ 1318 \ 1319 develop(bool, TraceThreadEvents, false, \ 1320 "Trace all thread events") \ 1321 \ 1322 develop(bool, TraceBytecodes, false, \ 1323 "Trace bytecode execution") \ 1324 \ 1325 develop(bool, TraceClassInitialization, false, \ 1326 "Trace class initialization") \ 1327 \ 1328 develop(bool, TraceExceptions, false, \ 1329 "Trace exceptions") \ 1330 \ 1331 develop(bool, TraceICs, false, \ 1332 "Trace inline cache changes") \ 1333 \ 1334 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1335 "Trace method invocation counter overflow") \ 1336 \ 1337 develop(bool, TraceInlineCacheClearing, false, \ 1338 "Trace clearing of inline caches in nmethods") \ 1339 \ 1340 develop(bool, TraceDependencies, false, \ 1341 "Trace dependencies") \ 1342 \ 1343 develop(bool, VerifyDependencies, trueInDebug, \ 1344 "Exercise and verify the compilation dependency mechanism") \ 1345 \ 1346 develop(bool, TraceNewOopMapGeneration, false, \ 1347 "Trace OopMapGeneration") \ 1348 \ 1349 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1350 "Trace OopMapGeneration: print detailed cell states") \ 1351 \ 1352 develop(bool, TimeOopMap, false, \ 1353 "Time calls to GenerateOopMap::compute_map() in sum") \ 1354 \ 1355 develop(bool, TimeOopMap2, false, \ 1356 "Time calls to GenerateOopMap::compute_map() individually") \ 1357 \ 1358 develop(bool, TraceMonitorMismatch, false, \ 1359 "Trace monitor matching failures during OopMapGeneration") \ 1360 \ 1361 develop(bool, TraceOopMapRewrites, false, \ 1362 "Trace rewritting of method oops during oop map generation") \ 1363 \ 1364 develop(bool, TraceSafepoint, false, \ 1365 "Trace safepoint operations") \ 1366 \ 1367 develop(bool, TraceICBuffer, false, \ 1368 "Trace usage of IC buffer") \ 1369 \ 1370 develop(bool, TraceCompiledIC, false, \ 1371 "Trace changes of compiled IC") \ 1372 \ 1373 notproduct(bool, TraceZapDeadLocals, false, \ 1374 "Trace zapping dead locals") \ 1375 \ 1376 develop(bool, TraceStartupTime, false, \ 1377 "Trace setup time") \ 1378 \ 1379 product(ccstr, HPILibPath, NULL, \ 1380 "Specify alternate path to HPI library") \ 1381 \ 1382 develop(bool, TraceProtectionDomainVerification, false, \ 1383 "Trace protection domain verifcation") \ 1384 \ 1385 develop(bool, TraceClearedExceptions, false, \ 1386 "Prints when an exception is forcibly cleared") \ 1387 \ 1388 product(bool, TraceClassResolution, false, \ 1389 "Trace all constant pool resolutions (for debugging)") \ 1390 \ 1391 product(bool, TraceBiasedLocking, false, \ 1392 "Trace biased locking in JVM") \ 1393 \ 1394 product(bool, TraceMonitorInflation, false, \ 1395 "Trace monitor inflation in JVM") \ 1396 \ 1397 /* assembler */ \ 1398 product(bool, Use486InstrsOnly, false, \ 1399 "Use 80486 Compliant instruction subset") \ 1400 \ 1401 /* gc */ \ 1402 \ 1403 product(bool, UseSerialGC, false, \ 1404 "Use the serial garbage collector") \ 1405 \ 1406 product(bool, UseG1GC, false, \ 1407 "Use the Garbage-First garbage collector") \ 1408 \ 1409 product(bool, UseParallelGC, false, \ 1410 "Use the Parallel Scavenge garbage collector") \ 1411 \ 1412 product(bool, UseParallelOldGC, false, \ 1413 "Use the Parallel Old garbage collector") \ 1414 \ 1415 product(uintx, HeapMaximumCompactionInterval, 20, \ 1416 "How often should we maximally compact the heap (not allowing " \ 1417 "any dead space)") \ 1418 \ 1419 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1420 "The collection count for the first maximum compaction") \ 1421 \ 1422 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1423 "In the Parallel Old garbage collector maximum compaction for " \ 1424 "a system GC") \ 1425 \ 1426 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1427 "The mean used by the par compact dead wood" \ 1428 "limiter (a number between 0-100).") \ 1429 \ 1430 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1431 "The standard deviation used by the par compact dead wood" \ 1432 "limiter (a number between 0-100).") \ 1433 \ 1434 product(uintx, ParallelGCThreads, 0, \ 1435 "Number of parallel threads parallel gc will use") \ 1436 \ 1437 product(bool, UseDynamicNumberOfGCThreads, false, \ 1438 "Dynamically choose the number of parallel threads " \ 1439 "parallel gc will use") \ 1440 \ 1441 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1442 "Force dynamic selection of the number of" \ 1443 "parallel threads parallel gc will use to aid debugging") \ 1444 \ 1445 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1446 "Size of heap (bytes) per GC thread used in calculating the " \ 1447 "number of GC threads") \ 1448 \ 1449 product(bool, TraceDynamicGCThreads, false, \ 1450 "Trace the dynamic GC thread usage") \ 1451 \ 1452 develop(bool, ParallelOldGCSplitALot, false, \ 1453 "Provoke splitting (copying data from a young gen space to" \ 1454 "multiple destination spaces)") \ 1455 \ 1456 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1457 "How often to provoke splitting a young gen space") \ 1458 \ 1459 develop(bool, TraceRegionTasksQueuing, false, \ 1460 "Trace the queuing of the region tasks") \ 1461 \ 1462 product(uintx, ConcGCThreads, 0, \ 1463 "Number of threads concurrent gc will use") \ 1464 \ 1465 product(uintx, YoungPLABSize, 4096, \ 1466 "Size of young gen promotion labs (in HeapWords)") \ 1467 \ 1468 product(uintx, OldPLABSize, 1024, \ 1469 "Size of old gen promotion labs (in HeapWords)") \ 1470 \ 1471 product(uintx, GCTaskTimeStampEntries, 200, \ 1472 "Number of time stamp entries per gc worker thread") \ 1473 \ 1474 product(bool, AlwaysTenure, false, \ 1475 "Always tenure objects in eden. (ParallelGC only)") \ 1476 \ 1477 product(bool, NeverTenure, false, \ 1478 "Never tenure objects in eden, May tenure on overflow " \ 1479 "(ParallelGC only)") \ 1480 \ 1481 product(bool, ScavengeBeforeFullGC, true, \ 1482 "Scavenge youngest generation before each full GC, " \ 1483 "used with UseParallelGC") \ 1484 \ 1485 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1486 "Allow scavenges to occur when to_space contains objects.") \ 1487 \ 1488 product(bool, UseConcMarkSweepGC, false, \ 1489 "Use Concurrent Mark-Sweep GC in the old generation") \ 1490 \ 1491 product(bool, ExplicitGCInvokesConcurrent, false, \ 1492 "A System.gc() request invokes a concurrent collection;" \ 1493 " (effective only when UseConcMarkSweepGC)") \ 1494 \ 1495 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1496 "A System.gc() request invokes a concurrent collection and " \ 1497 "also unloads classes during such a concurrent gc cycle " \ 1498 "(effective only when UseConcMarkSweepGC)") \ 1499 \ 1500 product(bool, GCLockerInvokesConcurrent, false, \ 1501 "The exit of a JNI CS necessitating a scavenge also" \ 1502 " kicks off a bkgrd concurrent collection") \ 1503 \ 1504 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1505 "How much the GC can expand the eden by while the GC locker " \ 1506 "is active (as a percentage)") \ 1507 \ 1508 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1509 "Use Adaptive Free Lists in the CMS generation") \ 1510 \ 1511 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1512 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1513 \ 1514 develop(bool, RotateCMSCollectionTypes, false, \ 1515 "Rotate the CMS collections among concurrent and STW") \ 1516 \ 1517 product(bool, UseCMSBestFit, true, \ 1518 "Use CMS best fit allocation strategy") \ 1519 \ 1520 product(bool, UseCMSCollectionPassing, true, \ 1521 "Use passing of collection from background to foreground") \ 1522 \ 1523 product(bool, UseParNewGC, false, \ 1524 "Use parallel threads in the new generation.") \ 1525 \ 1526 product(bool, ParallelGCVerbose, false, \ 1527 "Verbose output for parallel GC.") \ 1528 \ 1529 product(intx, ParallelGCBufferWastePct, 10, \ 1530 "wasted fraction of parallel allocation buffer.") \ 1531 \ 1532 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1533 "Retain parallel allocation buffers across scavenges; " \ 1534 " -- disabled because this currently conflicts with " \ 1535 " parallel card scanning under certain conditions ") \ 1536 \ 1537 product(intx, TargetPLABWastePct, 10, \ 1538 "target wasted space in last buffer as pct of overall allocation")\ 1539 \ 1540 product(uintx, PLABWeight, 75, \ 1541 "Percentage (0-100) used to weight the current sample when" \ 1542 "computing exponentially decaying average for ResizePLAB.") \ 1543 \ 1544 product(bool, ResizePLAB, true, \ 1545 "Dynamically resize (survivor space) promotion labs") \ 1546 \ 1547 product(bool, PrintPLAB, false, \ 1548 "Print (survivor space) promotion labs sizing decisions") \ 1549 \ 1550 product(intx, ParGCArrayScanChunk, 50, \ 1551 "Scan a subset and push remainder, if array is bigger than this") \ 1552 \ 1553 product(bool, ParGCUseLocalOverflow, false, \ 1554 "Instead of a global overflow list, use local overflow stacks") \ 1555 \ 1556 product(bool, ParGCTrimOverflow, true, \ 1557 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1558 \ 1559 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1560 "Whether we should simulate work queue overflow in ParNew") \ 1561 \ 1562 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1563 "An `interval' counter that determines how frequently " \ 1564 "we simulate overflow; a smaller number increases frequency") \ 1565 \ 1566 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1567 "The desired number of objects to claim from the overflow list") \ 1568 \ 1569 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1570 "The number of strides per worker thread that we divide up the " \ 1571 "card table scanning work into") \ 1572 \ 1573 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1574 "The number of cards in each chunk of the parallel chunks used " \ 1575 "during card table scanning") \ 1576 \ 1577 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1578 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1579 "parallel GC.") \ 1580 \ 1581 product(uintx, OldPLABWeight, 50, \ 1582 "Percentage (0-100) used to weight the current sample when" \ 1583 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1584 \ 1585 product(bool, ResizeOldPLAB, true, \ 1586 "Dynamically resize (old gen) promotion labs") \ 1587 \ 1588 product(bool, PrintOldPLAB, false, \ 1589 "Print (old gen) promotion labs sizing decisions") \ 1590 \ 1591 product(uintx, CMSOldPLABMin, 16, \ 1592 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1593 \ 1594 product(uintx, CMSOldPLABMax, 1024, \ 1595 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1596 \ 1597 product(uintx, CMSOldPLABNumRefills, 4, \ 1598 "Nominal number of refills of CMS gen promotion lab cache" \ 1599 " per worker per block size") \ 1600 \ 1601 product(bool, CMSOldPLABResizeQuicker, false, \ 1602 "Whether to react on-the-fly during a scavenge to a sudden" \ 1603 " change in block demand rate") \ 1604 \ 1605 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1606 "The tolerance of the phase-change detector for on-the-fly" \ 1607 " PLAB resizing during a scavenge") \ 1608 \ 1609 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1610 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1611 " during a scavenge") \ 1612 \ 1613 product(uintx, CMSOldPLABReactivityCeiling, 10, \ 1614 "The clamping of the gain in the feedback loop for on-the-fly" \ 1615 " PLAB resizing during a scavenge") \ 1616 \ 1617 product(bool, AlwaysPreTouch, false, \ 1618 "It forces all freshly committed pages to be pre-touched.") \ 1619 \ 1620 product_pd(intx, CMSYoungGenPerWorker, \ 1621 "The maximum size of young gen chosen by default per GC worker " \ 1622 "thread available") \ 1623 \ 1624 product(bool, GCOverheadReporting, false, \ 1625 "Enables the GC overhead reporting facility") \ 1626 \ 1627 product(intx, GCOverheadReportingPeriodMS, 100, \ 1628 "Reporting period for conc GC overhead reporting, in ms ") \ 1629 \ 1630 product(bool, CMSIncrementalMode, false, \ 1631 "Whether CMS GC should operate in \"incremental\" mode") \ 1632 \ 1633 product(uintx, CMSIncrementalDutyCycle, 10, \ 1634 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1635 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1636 "value") \ 1637 \ 1638 product(bool, CMSIncrementalPacing, true, \ 1639 "Whether the CMS incremental mode duty cycle should be " \ 1640 "automatically adjusted") \ 1641 \ 1642 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1643 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1644 "enabled (a percentage, 0-100)") \ 1645 \ 1646 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1647 "Percentage (0-100) used to add conservatism when computing the " \ 1648 "duty cycle") \ 1649 \ 1650 product(uintx, CMSIncrementalOffset, 0, \ 1651 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1652 " is shifted to the right within the period between young GCs") \ 1653 \ 1654 product(uintx, CMSExpAvgFactor, 50, \ 1655 "Percentage (0-100) used to weight the current sample when" \ 1656 "computing exponential averages for CMS statistics.") \ 1657 \ 1658 product(uintx, CMS_FLSWeight, 75, \ 1659 "Percentage (0-100) used to weight the current sample when" \ 1660 "computing exponentially decating averages for CMS FLS statistics.") \ 1661 \ 1662 product(uintx, CMS_FLSPadding, 1, \ 1663 "The multiple of deviation from mean to use for buffering" \ 1664 "against volatility in free list demand.") \ 1665 \ 1666 product(uintx, FLSCoalescePolicy, 2, \ 1667 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1668 \ 1669 product(bool, FLSAlwaysCoalesceLarge, false, \ 1670 "CMS: Larger free blocks are always available for coalescing") \ 1671 \ 1672 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1673 "CMS: the smaller the percentage the greater the coalition force")\ 1674 \ 1675 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1676 "CMS: the factor by which to inflate estimated demand of small" \ 1677 " block sizes to prevent coalescing with an adjoining block") \ 1678 \ 1679 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1680 "CMS: the factor by which to inflate estimated demand of large" \ 1681 " block sizes to prevent coalescing with an adjoining block") \ 1682 \ 1683 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1684 "CMS: the factor by which to inflate estimated demand of small" \ 1685 " block sizes to prevent splitting to supply demand for smaller" \ 1686 " blocks") \ 1687 \ 1688 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1689 "CMS: the factor by which to inflate estimated demand of large" \ 1690 " block sizes to prevent splitting to supply demand for smaller" \ 1691 " blocks") \ 1692 \ 1693 product(bool, CMSExtrapolateSweep, false, \ 1694 "CMS: cushion for block demand during sweep") \ 1695 \ 1696 product(uintx, CMS_SweepWeight, 75, \ 1697 "Percentage (0-100) used to weight the current sample when " \ 1698 "computing exponentially decaying average for inter-sweep " \ 1699 "duration") \ 1700 \ 1701 product(uintx, CMS_SweepPadding, 1, \ 1702 "The multiple of deviation from mean to use for buffering " \ 1703 "against volatility in inter-sweep duration.") \ 1704 \ 1705 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1706 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1707 "duration exceeds this threhold in milliseconds") \ 1708 \ 1709 develop(bool, CMSTraceIncrementalMode, false, \ 1710 "Trace CMS incremental mode") \ 1711 \ 1712 develop(bool, CMSTraceIncrementalPacing, false, \ 1713 "Trace CMS incremental mode pacing computation") \ 1714 \ 1715 develop(bool, CMSTraceThreadState, false, \ 1716 "Trace the CMS thread state (enable the trace_state() method)") \ 1717 \ 1718 product(bool, CMSClassUnloadingEnabled, false, \ 1719 "Whether class unloading enabled when using CMS GC") \ 1720 \ 1721 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1722 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1723 " for which classes may not be unloaded") \ 1724 \ 1725 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1726 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1727 \ 1728 product(bool, UseCMSCompactAtFullCollection, true, \ 1729 "Use mark sweep compact at full collections") \ 1730 \ 1731 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1732 "Number of CMS full collection done before compaction if > 0") \ 1733 \ 1734 develop(intx, CMSDictionaryChoice, 0, \ 1735 "Use BinaryTreeDictionary as default in the CMS generation") \ 1736 \ 1737 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1738 "Replenish an indexed free list with this number of chunks") \ 1739 \ 1740 product(bool, CMSReplenishIntermediate, true, \ 1741 "Replenish all intermediate free-list caches") \ 1742 \ 1743 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1744 "When satisfying batched demand, split blocks from the " \ 1745 "IndexedFreeList whose size is a multiple of requested size") \ 1746 \ 1747 product(bool, CMSLoopWarn, false, \ 1748 "Warn in case of excessive CMS looping") \ 1749 \ 1750 develop(bool, CMSOverflowEarlyRestoration, false, \ 1751 "Whether preserved marks should be restored early") \ 1752 \ 1753 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1754 "Size of marking stack") \ 1755 \ 1756 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1757 "Max size of marking stack") \ 1758 \ 1759 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1760 "Whether we should simulate frequent marking stack / work queue" \ 1761 " overflow") \ 1762 \ 1763 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1764 "An `interval' counter that determines how frequently" \ 1765 " we simulate overflow; a smaller number increases frequency") \ 1766 \ 1767 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1768 "(Temporary, subject to experimentation)" \ 1769 "Maximum number of abortable preclean iterations, if > 0") \ 1770 \ 1771 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1772 "(Temporary, subject to experimentation)" \ 1773 "Maximum time in abortable preclean in ms") \ 1774 \ 1775 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1776 "(Temporary, subject to experimentation)" \ 1777 "Nominal minimum work per abortable preclean iteration") \ 1778 \ 1779 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1780 "(Temporary, subject to experimentation)" \ 1781 " Time that we sleep between iterations when not given" \ 1782 " enough work per iteration") \ 1783 \ 1784 product(uintx, CMSRescanMultiple, 32, \ 1785 "Size (in cards) of CMS parallel rescan task") \ 1786 \ 1787 product(uintx, CMSConcMarkMultiple, 32, \ 1788 "Size (in cards) of CMS concurrent MT marking task") \ 1789 \ 1790 product(uintx, CMSRevisitStackSize, 1*M, \ 1791 "Size of CMS KlassKlass revisit stack") \ 1792 \ 1793 product(bool, CMSAbortSemantics, false, \ 1794 "Whether abort-on-overflow semantics is implemented") \ 1795 \ 1796 product(bool, CMSParallelRemarkEnabled, true, \ 1797 "Whether parallel remark enabled (only if ParNewGC)") \ 1798 \ 1799 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1800 "Whether parallel remark of survivor space" \ 1801 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1802 \ 1803 product(bool, CMSPLABRecordAlways, true, \ 1804 "Whether to always record survivor space PLAB bdries" \ 1805 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1806 \ 1807 product(bool, CMSConcurrentMTEnabled, true, \ 1808 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1809 \ 1810 product(bool, CMSPermGenPrecleaningEnabled, true, \ 1811 "Whether concurrent precleaning enabled in perm gen" \ 1812 " (effective only when CMSPrecleaningEnabled is true)") \ 1813 \ 1814 product(bool, CMSPrecleaningEnabled, true, \ 1815 "Whether concurrent precleaning enabled") \ 1816 \ 1817 product(uintx, CMSPrecleanIter, 3, \ 1818 "Maximum number of precleaning iteration passes") \ 1819 \ 1820 product(uintx, CMSPrecleanNumerator, 2, \ 1821 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1822 " ratio") \ 1823 \ 1824 product(uintx, CMSPrecleanDenominator, 3, \ 1825 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1826 " ratio") \ 1827 \ 1828 product(bool, CMSPrecleanRefLists1, true, \ 1829 "Preclean ref lists during (initial) preclean phase") \ 1830 \ 1831 product(bool, CMSPrecleanRefLists2, false, \ 1832 "Preclean ref lists during abortable preclean phase") \ 1833 \ 1834 product(bool, CMSPrecleanSurvivors1, false, \ 1835 "Preclean survivors during (initial) preclean phase") \ 1836 \ 1837 product(bool, CMSPrecleanSurvivors2, true, \ 1838 "Preclean survivors during abortable preclean phase") \ 1839 \ 1840 product(uintx, CMSPrecleanThreshold, 1000, \ 1841 "Don't re-iterate if #dirty cards less than this") \ 1842 \ 1843 product(bool, CMSCleanOnEnter, true, \ 1844 "Clean-on-enter optimization for reducing number of dirty cards") \ 1845 \ 1846 product(uintx, CMSRemarkVerifyVariant, 1, \ 1847 "Choose variant (1,2) of verification following remark") \ 1848 \ 1849 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1850 "If Eden used is below this value, don't try to schedule remark") \ 1851 \ 1852 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1853 "The Eden occupancy % at which to try and schedule remark pause") \ 1854 \ 1855 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1856 "Start sampling Eden top at least before yg occupancy reaches" \ 1857 " 1/<ratio> of the size at which we plan to schedule remark") \ 1858 \ 1859 product(uintx, CMSSamplingGrain, 16*K, \ 1860 "The minimum distance between eden samples for CMS (see above)") \ 1861 \ 1862 product(bool, CMSScavengeBeforeRemark, false, \ 1863 "Attempt scavenge before the CMS remark step") \ 1864 \ 1865 develop(bool, CMSTraceSweeper, false, \ 1866 "Trace some actions of the CMS sweeper") \ 1867 \ 1868 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1869 "Don't drain below this size per parallel worker/thief") \ 1870 \ 1871 manageable(intx, CMSWaitDuration, 2000, \ 1872 "Time in milliseconds that CMS thread waits for young GC") \ 1873 \ 1874 product(bool, CMSYield, true, \ 1875 "Yield between steps of concurrent mark & sweep") \ 1876 \ 1877 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1878 "Bitmap operations should process at most this many bits" \ 1879 "between yields") \ 1880 \ 1881 product(bool, CMSDumpAtPromotionFailure, false, \ 1882 "Dump useful information about the state of the CMS old " \ 1883 " generation upon a promotion failure.") \ 1884 \ 1885 product(bool, CMSPrintChunksInDump, false, \ 1886 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1887 " more detailed information about the free chunks.") \ 1888 \ 1889 product(bool, CMSPrintObjectsInDump, false, \ 1890 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1891 " more detailed information about the allocated objects.") \ 1892 \ 1893 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1894 "Verify that all refs across the FLS boundary " \ 1895 " are to valid objects") \ 1896 \ 1897 diagnostic(bool, FLSVerifyLists, false, \ 1898 "Do lots of (expensive) FreeListSpace verification") \ 1899 \ 1900 diagnostic(bool, FLSVerifyIndexTable, false, \ 1901 "Do lots of (expensive) FLS index table verification") \ 1902 \ 1903 develop(bool, FLSVerifyDictionary, false, \ 1904 "Do lots of (expensive) FLS dictionary verification") \ 1905 \ 1906 develop(bool, VerifyBlockOffsetArray, false, \ 1907 "Do (expensive!) block offset array verification") \ 1908 \ 1909 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1910 "Maintain _unallocated_block in BlockOffsetArray" \ 1911 " (currently applicable only to CMS collector)") \ 1912 \ 1913 develop(bool, TraceCMSState, false, \ 1914 "Trace the state of the CMS collection") \ 1915 \ 1916 product(intx, RefDiscoveryPolicy, 0, \ 1917 "Whether reference-based(0) or referent-based(1)") \ 1918 \ 1919 product(bool, ParallelRefProcEnabled, false, \ 1920 "Enable parallel reference processing whenever possible") \ 1921 \ 1922 product(bool, ParallelRefProcBalancingEnabled, true, \ 1923 "Enable balancing of reference processing queues") \ 1924 \ 1925 product(intx, CMSTriggerRatio, 80, \ 1926 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1927 "allocated before a CMS collection cycle commences") \ 1928 \ 1929 product(intx, CMSTriggerPermRatio, 80, \ 1930 "Percentage of MinHeapFreeRatio in the CMS perm generation that " \ 1931 "is allocated before a CMS collection cycle commences, that " \ 1932 "also collects the perm generation") \ 1933 \ 1934 product(uintx, CMSBootstrapOccupancy, 50, \ 1935 "Percentage CMS generation occupancy at which to " \ 1936 "initiate CMS collection for bootstrapping collection stats") \ 1937 \ 1938 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1939 "Percentage CMS generation occupancy to start a CMS collection " \ 1940 "cycle. A negative value means that CMSTriggerRatio is used") \ 1941 \ 1942 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1943 "Percentage of the (entire) heap occupancy to start a " \ 1944 "concurrent GC cycle. It us used by GCs that trigger a " \ 1945 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1946 "not just one of the generations (e.g., G1). A value of 0 " \ 1947 "denotes 'do constant GC cycles'.") \ 1948 \ 1949 product(intx, CMSInitiatingPermOccupancyFraction, -1, \ 1950 "Percentage CMS perm generation occupancy to start a " \ 1951 "CMScollection cycle. A negative value means that " \ 1952 "CMSTriggerPermRatio is used") \ 1953 \ 1954 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1955 "Only use occupancy as a crierion for starting a CMS collection") \ 1956 \ 1957 product(intx, CMSIsTooFullPercentage, 98, \ 1958 "An absolute ceiling above which CMS will always consider the " \ 1959 "perm gen ripe for collection") \ 1960 \ 1961 develop(bool, CMSTestInFreeList, false, \ 1962 "Check if the coalesced range is already in the " \ 1963 "free lists as claimed") \ 1964 \ 1965 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1966 "Check that all the garbage collected was returned to the " \ 1967 "free lists.") \ 1968 \ 1969 notproduct(bool, ScavengeALot, false, \ 1970 "Force scavenge at every Nth exit from the runtime system " \ 1971 "(N=ScavengeALotInterval)") \ 1972 \ 1973 develop(bool, FullGCALot, false, \ 1974 "Force full gc at every Nth exit from the runtime system " \ 1975 "(N=FullGCALotInterval)") \ 1976 \ 1977 notproduct(bool, GCALotAtAllSafepoints, false, \ 1978 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1979 \ 1980 product(bool, PrintPromotionFailure, false, \ 1981 "Print additional diagnostic information following " \ 1982 " promotion failure") \ 1983 \ 1984 notproduct(bool, PromotionFailureALot, false, \ 1985 "Use promotion failure handling on every youngest generation " \ 1986 "collection") \ 1987 \ 1988 develop(uintx, PromotionFailureALotCount, 1000, \ 1989 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1990 "refill attempts (ParNew) or promotion attempts " \ 1991 "(other young collectors) ") \ 1992 \ 1993 develop(uintx, PromotionFailureALotInterval, 5, \ 1994 "Total collections between promotion failures alot") \ 1995 \ 1996 experimental(intx, WorkStealingSleepMillis, 1, \ 1997 "Sleep time when sleep is used for yields") \ 1998 \ 1999 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 2000 "Number of yields before a sleep is done during workstealing") \ 2001 \ 2002 experimental(uintx, WorkStealingHardSpins, 4096, \ 2003 "Number of iterations in a spin loop between checks on " \ 2004 "time out of hard spin") \ 2005 \ 2006 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 2007 "Ratio of hard spins to calls to yield") \ 2008 \ 2009 product(uintx, PreserveMarkStackSize, 1024, \ 2010 "Size for stack used in promotion failure handling") \ 2011 \ 2012 develop(uintx, ObjArrayMarkingStride, 512, \ 2013 "Number of ObjArray elements to push onto the marking stack" \ 2014 "before pushing a continuation entry") \ 2015 \ 2016 notproduct(bool, ExecuteInternalVMTests, false, \ 2017 "Enable execution of internal VM tests.") \ 2018 \ 2019 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2020 \ 2021 product_pd(bool, ResizeTLAB, \ 2022 "Dynamically resize tlab size for threads") \ 2023 \ 2024 product(bool, ZeroTLAB, false, \ 2025 "Zero out the newly created TLAB") \ 2026 \ 2027 product(bool, FastTLABRefill, true, \ 2028 "Use fast TLAB refill code") \ 2029 \ 2030 product(bool, PrintTLAB, false, \ 2031 "Print various TLAB related information") \ 2032 \ 2033 product(bool, TLABStats, true, \ 2034 "Print various TLAB related information") \ 2035 \ 2036 product(bool, UseBlockZeroing, false, \ 2037 "Use special cpu instructions for block zeroing") \ 2038 \ 2039 product(intx, BlockZeroingLowLimit, 2048, \ 2040 "Minimum size in bytes when block zeroing will be used") \ 2041 \ 2042 product(bool, UseBlockCopy, false, \ 2043 "Use special cpu instructions for block copy") \ 2044 \ 2045 product(intx, BlockCopyLowLimit, 2048, \ 2046 "Minimum size in bytes when block copy will be used") \ 2047 \ 2048 product(bool, PrintRevisitStats, false, \ 2049 "Print revisit (klass and MDO) stack related information") \ 2050 \ 2051 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2052 "Enable LowMemoryProtection")) \ 2053 \ 2054 product_pd(bool, NeverActAsServerClassMachine, \ 2055 "Never act like a server-class machine") \ 2056 \ 2057 product(bool, AlwaysActAsServerClassMachine, false, \ 2058 "Always act like a server-class machine") \ 2059 \ 2060 product_pd(uint64_t, MaxRAM, \ 2061 "Real memory size (in bytes) used to set maximum heap size") \ 2062 \ 2063 product(uintx, ErgoHeapSizeLimit, 0, \ 2064 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2065 "MaxRAM / MaxRAMFraction") \ 2066 \ 2067 product(uintx, MaxRAMFraction, 4, \ 2068 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2069 "size") \ 2070 \ 2071 product(uintx, DefaultMaxRAMFraction, 4, \ 2072 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2073 "size; deprecated: to be renamed to MaxRAMFraction") \ 2074 \ 2075 product(uintx, MinRAMFraction, 2, \ 2076 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 2077 "size on systems with small physical memory size") \ 2078 \ 2079 product(uintx, InitialRAMFraction, 64, \ 2080 "Fraction (1/n) of real memory used for initial heap size") \ 2081 \ 2082 product(bool, UseAutoGCSelectPolicy, false, \ 2083 "Use automatic collection selection policy") \ 2084 \ 2085 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2086 "Automatic GC selection pause threshhold in ms") \ 2087 \ 2088 product(bool, UseAdaptiveSizePolicy, true, \ 2089 "Use adaptive generation sizing policies") \ 2090 \ 2091 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2092 "Use adaptive survivor sizing policies") \ 2093 \ 2094 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2095 "Use adaptive young-old sizing policies at minor collections") \ 2096 \ 2097 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2098 "Use adaptive young-old sizing policies at major collections") \ 2099 \ 2100 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2101 "Use statistics from System.GC for adaptive size policy") \ 2102 \ 2103 product(bool, UseAdaptiveGCBoundary, false, \ 2104 "Allow young-old boundary to move") \ 2105 \ 2106 develop(bool, TraceAdaptiveGCBoundary, false, \ 2107 "Trace young-old boundary moves") \ 2108 \ 2109 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2110 "Resize the virtual spaces of the young or old generations") \ 2111 \ 2112 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2113 "Policy for changeing generation size for throughput goals") \ 2114 \ 2115 product(uintx, AdaptiveSizePausePolicy, 0, \ 2116 "Policy for changing generation size for pause goals") \ 2117 \ 2118 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2119 "Adjust tenured generation to achive a minor pause goal") \ 2120 \ 2121 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2122 "Adjust young generation to achive a major pause goal") \ 2123 \ 2124 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2125 "Number of steps where heuristics is used before data is used") \ 2126 \ 2127 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2128 "Number of collections before the adaptive sizing is started") \ 2129 \ 2130 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2131 "Collecton interval for printing information; zero => never") \ 2132 \ 2133 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2134 "Use adaptive minimum footprint as a goal") \ 2135 \ 2136 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2137 "Weight given to exponential resizing, between 0 and 100") \ 2138 \ 2139 product(uintx, AdaptiveTimeWeight, 25, \ 2140 "Weight given to time in adaptive policy, between 0 and 100") \ 2141 \ 2142 product(uintx, PausePadding, 1, \ 2143 "How much buffer to keep for pause time") \ 2144 \ 2145 product(uintx, PromotedPadding, 3, \ 2146 "How much buffer to keep for promotion failure") \ 2147 \ 2148 product(uintx, SurvivorPadding, 3, \ 2149 "How much buffer to keep for survivor overflow") \ 2150 \ 2151 product(uintx, AdaptivePermSizeWeight, 20, \ 2152 "Weight for perm gen exponential resizing, between 0 and 100") \ 2153 \ 2154 product(uintx, PermGenPadding, 3, \ 2155 "How much buffer to keep for perm gen sizing") \ 2156 \ 2157 product(uintx, ThresholdTolerance, 10, \ 2158 "Allowed collection cost difference between generations") \ 2159 \ 2160 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2161 "If collection costs are within margin, reduce both by full " \ 2162 "delta") \ 2163 \ 2164 product(uintx, YoungGenerationSizeIncrement, 20, \ 2165 "Adaptive size percentage change in young generation") \ 2166 \ 2167 product(uintx, YoungGenerationSizeSupplement, 80, \ 2168 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2169 \ 2170 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2171 "Decay factor to YoungedGenerationSizeSupplement") \ 2172 \ 2173 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2174 "Adaptive size percentage change in tenured generation") \ 2175 \ 2176 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2177 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2178 \ 2179 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2180 "Decay factor to TenuredGenerationSizeIncrement") \ 2181 \ 2182 product(uintx, MaxGCPauseMillis, max_uintx, \ 2183 "Adaptive size policy maximum GC pause time goal in msec, " \ 2184 "or (G1 Only) the max. GC time per MMU time slice") \ 2185 \ 2186 product(uintx, GCPauseIntervalMillis, 0, \ 2187 "Time slice for MMU specification") \ 2188 \ 2189 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2190 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2191 \ 2192 product(uintx, GCTimeRatio, 99, \ 2193 "Adaptive size policy application time to GC time ratio") \ 2194 \ 2195 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2196 "Adaptive size scale down factor for shrinking") \ 2197 \ 2198 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2199 "Adaptive size decays the major cost for long major intervals") \ 2200 \ 2201 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2202 "Time scale over which major costs decay") \ 2203 \ 2204 product(uintx, MinSurvivorRatio, 3, \ 2205 "Minimum ratio of young generation/survivor space size") \ 2206 \ 2207 product(uintx, InitialSurvivorRatio, 8, \ 2208 "Initial ratio of eden/survivor space size") \ 2209 \ 2210 product(uintx, BaseFootPrintEstimate, 256*M, \ 2211 "Estimate of footprint other than Java Heap") \ 2212 \ 2213 product(bool, UseGCOverheadLimit, true, \ 2214 "Use policy to limit of proportion of time spent in GC " \ 2215 "before an OutOfMemory error is thrown") \ 2216 \ 2217 product(uintx, GCTimeLimit, 98, \ 2218 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2219 "error is thrown (used with GCHeapFreeLimit)") \ 2220 \ 2221 product(uintx, GCHeapFreeLimit, 2, \ 2222 "Minimum percentage of free space after a full GC before an " \ 2223 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2224 \ 2225 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2226 "Number of consecutive collections before gc time limit fires") \ 2227 \ 2228 product(bool, PrintAdaptiveSizePolicy, false, \ 2229 "Print information about AdaptiveSizePolicy") \ 2230 \ 2231 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2232 "How far ahead to prefetch destination area (<= 0 means off)") \ 2233 \ 2234 product(intx, PrefetchScanIntervalInBytes, -1, \ 2235 "How far ahead to prefetch scan area (<= 0 means off)") \ 2236 \ 2237 product(intx, PrefetchFieldsAhead, -1, \ 2238 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2239 \ 2240 develop(bool, UsePrefetchQueue, true, \ 2241 "Use the prefetch queue during PS promotion") \ 2242 \ 2243 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2244 "Verify system before exiting") \ 2245 \ 2246 diagnostic(bool, VerifyBeforeGC, false, \ 2247 "Verify memory system before GC") \ 2248 \ 2249 diagnostic(bool, VerifyAfterGC, false, \ 2250 "Verify memory system after GC") \ 2251 \ 2252 diagnostic(bool, VerifyDuringGC, false, \ 2253 "Verify memory system during GC (between phases)") \ 2254 \ 2255 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2256 "Enable parallel memory system verification") \ 2257 \ 2258 diagnostic(bool, DeferInitialCardMark, false, \ 2259 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2260 "may arise from new_pre_store_barrier") \ 2261 \ 2262 diagnostic(bool, VerifyRememberedSets, false, \ 2263 "Verify GC remembered sets") \ 2264 \ 2265 diagnostic(bool, VerifyObjectStartArray, true, \ 2266 "Verify GC object start array if verify before/after") \ 2267 \ 2268 product(bool, DisableExplicitGC, false, \ 2269 "Tells whether calling System.gc() does a full GC") \ 2270 \ 2271 notproduct(bool, CheckMemoryInitialization, false, \ 2272 "Checks memory initialization") \ 2273 \ 2274 product(bool, CollectGen0First, false, \ 2275 "Collect youngest generation before each full GC") \ 2276 \ 2277 diagnostic(bool, BindCMSThreadToCPU, false, \ 2278 "Bind CMS Thread to CPU if possible") \ 2279 \ 2280 diagnostic(uintx, CPUForCMSThread, 0, \ 2281 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2282 \ 2283 product(bool, BindGCTaskThreadsToCPUs, false, \ 2284 "Bind GCTaskThreads to CPUs if possible") \ 2285 \ 2286 product(bool, UseGCTaskAffinity, false, \ 2287 "Use worker affinity when asking for GCTasks") \ 2288 \ 2289 product(uintx, ProcessDistributionStride, 4, \ 2290 "Stride through processors when distributing processes") \ 2291 \ 2292 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2293 "number of times the coordinator GC thread will sleep while " \ 2294 "yielding before giving up and resuming GC") \ 2295 \ 2296 product(uintx, CMSYieldSleepCount, 0, \ 2297 "number of times a GC thread (minus the coordinator) " \ 2298 "will sleep while yielding before giving up and resuming GC") \ 2299 \ 2300 /* gc tracing */ \ 2301 manageable(bool, PrintGC, false, \ 2302 "Print message at garbage collect") \ 2303 \ 2304 manageable(bool, PrintGCDetails, false, \ 2305 "Print more details at garbage collect") \ 2306 \ 2307 manageable(bool, PrintGCDateStamps, false, \ 2308 "Print date stamps at garbage collect") \ 2309 \ 2310 manageable(bool, PrintGCTimeStamps, false, \ 2311 "Print timestamps at garbage collect") \ 2312 \ 2313 product(bool, PrintGCTaskTimeStamps, false, \ 2314 "Print timestamps for individual gc worker thread tasks") \ 2315 \ 2316 develop(intx, ConcGCYieldTimeout, 0, \ 2317 "If non-zero, assert that GC threads yield within this # of ms.") \ 2318 \ 2319 notproduct(bool, TraceMarkSweep, false, \ 2320 "Trace mark sweep") \ 2321 \ 2322 product(bool, PrintReferenceGC, false, \ 2323 "Print times spent handling reference objects during GC " \ 2324 " (enabled only when PrintGCDetails)") \ 2325 \ 2326 develop(bool, TraceReferenceGC, false, \ 2327 "Trace handling of soft/weak/final/phantom references") \ 2328 \ 2329 develop(bool, TraceFinalizerRegistration, false, \ 2330 "Trace registration of final references") \ 2331 \ 2332 notproduct(bool, TraceScavenge, false, \ 2333 "Trace scavenge") \ 2334 \ 2335 product_rw(bool, TraceClassLoading, false, \ 2336 "Trace all classes loaded") \ 2337 \ 2338 product(bool, TraceClassLoadingPreorder, false, \ 2339 "Trace all classes loaded in order referenced (not loaded)") \ 2340 \ 2341 product_rw(bool, TraceClassUnloading, false, \ 2342 "Trace unloading of classes") \ 2343 \ 2344 product_rw(bool, TraceLoaderConstraints, false, \ 2345 "Trace loader constraints") \ 2346 \ 2347 product(bool, TraceGen0Time, false, \ 2348 "Trace accumulated time for Gen 0 collection") \ 2349 \ 2350 product(bool, TraceGen1Time, false, \ 2351 "Trace accumulated time for Gen 1 collection") \ 2352 \ 2353 product(bool, PrintTenuringDistribution, false, \ 2354 "Print tenuring age information") \ 2355 \ 2356 product_rw(bool, PrintHeapAtGC, false, \ 2357 "Print heap layout before and after each GC") \ 2358 \ 2359 product_rw(bool, PrintHeapAtGCExtended, false, \ 2360 "Prints extended information about the layout of the heap " \ 2361 "when -XX:+PrintHeapAtGC is set") \ 2362 \ 2363 product(bool, PrintHeapAtSIGBREAK, true, \ 2364 "Print heap layout in response to SIGBREAK") \ 2365 \ 2366 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2367 "Print a class histogram before any major stop-world GC") \ 2368 \ 2369 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2370 "Print a class histogram after any major stop-world GC") \ 2371 \ 2372 manageable(bool, PrintClassHistogram, false, \ 2373 "Print a histogram of class instances") \ 2374 \ 2375 develop(bool, TraceWorkGang, false, \ 2376 "Trace activities of work gangs") \ 2377 \ 2378 product(bool, TraceParallelOldGCTasks, false, \ 2379 "Trace multithreaded GC activity") \ 2380 \ 2381 develop(bool, TraceBlockOffsetTable, false, \ 2382 "Print BlockOffsetTable maps") \ 2383 \ 2384 develop(bool, TraceCardTableModRefBS, false, \ 2385 "Print CardTableModRefBS maps") \ 2386 \ 2387 develop(bool, TraceGCTaskManager, false, \ 2388 "Trace actions of the GC task manager") \ 2389 \ 2390 develop(bool, TraceGCTaskQueue, false, \ 2391 "Trace actions of the GC task queues") \ 2392 \ 2393 diagnostic(bool, TraceGCTaskThread, false, \ 2394 "Trace actions of the GC task threads") \ 2395 \ 2396 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2397 "Print the time taken by each parallel old gc phase." \ 2398 "PrintGCDetails must also be enabled.") \ 2399 \ 2400 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2401 "Trace parallel old gc marking phase") \ 2402 \ 2403 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2404 "Trace parallel old gc summary phase") \ 2405 \ 2406 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2407 "Trace parallel old gc compaction phase") \ 2408 \ 2409 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2410 "Trace parallel old gc dense prefix computation") \ 2411 \ 2412 develop(bool, IgnoreLibthreadGPFault, false, \ 2413 "Suppress workaround for libthread GP fault") \ 2414 \ 2415 product(bool, PrintJNIGCStalls, false, \ 2416 "Print diagnostic message when GC is stalled" \ 2417 "by JNI critical section") \ 2418 \ 2419 /* GC log rotation setting */ \ 2420 \ 2421 product(bool, UseGCLogFileRotation, false, \ 2422 "Prevent large gclog file for long running app. " \ 2423 "Requires -Xloggc:<filename>") \ 2424 \ 2425 product(uintx, NumberOfGCLogFiles, 0, \ 2426 "Number of gclog files in rotation, " \ 2427 "Default: 0, no rotation") \ 2428 \ 2429 product(uintx, GCLogFileSize, 0, \ 2430 "GC log file size, Default: 0 bytes, no rotation " \ 2431 "Only valid with UseGCLogFileRotation") \ 2432 \ 2433 /* JVMTI heap profiling */ \ 2434 \ 2435 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2436 "Trace JVMTI object tagging calls") \ 2437 \ 2438 diagnostic(bool, VerifyBeforeIteration, false, \ 2439 "Verify memory system before JVMTI iteration") \ 2440 \ 2441 /* compiler interface */ \ 2442 \ 2443 develop(bool, CIPrintCompilerName, false, \ 2444 "when CIPrint is active, print the name of the active compiler") \ 2445 \ 2446 develop(bool, CIPrintCompileQueue, false, \ 2447 "display the contents of the compile queue whenever a " \ 2448 "compilation is enqueued") \ 2449 \ 2450 develop(bool, CIPrintRequests, false, \ 2451 "display every request for compilation") \ 2452 \ 2453 product(bool, CITime, false, \ 2454 "collect timing information for compilation") \ 2455 \ 2456 develop(bool, CITimeEach, false, \ 2457 "display timing information after each successful compilation") \ 2458 \ 2459 develop(bool, CICountOSR, true, \ 2460 "use a separate counter when assigning ids to osr compilations") \ 2461 \ 2462 develop(bool, CICompileNatives, true, \ 2463 "compile native methods if supported by the compiler") \ 2464 \ 2465 develop_pd(bool, CICompileOSR, \ 2466 "compile on stack replacement methods if supported by the " \ 2467 "compiler") \ 2468 \ 2469 develop(bool, CIPrintMethodCodes, false, \ 2470 "print method bytecodes of the compiled code") \ 2471 \ 2472 develop(bool, CIPrintTypeFlow, false, \ 2473 "print the results of ciTypeFlow analysis") \ 2474 \ 2475 develop(bool, CITraceTypeFlow, false, \ 2476 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2477 \ 2478 develop(intx, CICloneLoopTestLimit, 100, \ 2479 "size limit for blocks heuristically cloned in ciTypeFlow") \ 2480 \ 2481 develop(intx, OSROnlyBCI, -1, \ 2482 "OSR only at this bci. Negative values mean exclude that bci") \ 2483 \ 2484 /* temp diagnostics */ \ 2485 \ 2486 diagnostic(bool, TraceRedundantCompiles, false, \ 2487 "Have compile broker print when a request already in the queue is"\ 2488 " requested again") \ 2489 \ 2490 diagnostic(bool, InitialCompileFast, false, \ 2491 "Initial compile at CompLevel_fast_compile") \ 2492 \ 2493 diagnostic(bool, InitialCompileReallyFast, false, \ 2494 "Initial compile at CompLevel_really_fast_compile (no profile)") \ 2495 \ 2496 diagnostic(bool, FullProfileOnReInterpret, true, \ 2497 "On re-interpret unc-trap compile next at CompLevel_fast_compile")\ 2498 \ 2499 /* compiler */ \ 2500 \ 2501 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2502 "Number of compiler threads to run") \ 2503 \ 2504 product(intx, CompilationPolicyChoice, 0, \ 2505 "which compilation policy (0/1)") \ 2506 \ 2507 develop(bool, UseStackBanging, true, \ 2508 "use stack banging for stack overflow checks (required for " \ 2509 "proper StackOverflow handling; disable only to measure cost " \ 2510 "of stackbanging)") \ 2511 \ 2512 develop(bool, Use24BitFPMode, true, \ 2513 "Set 24-bit FPU mode on a per-compile basis ") \ 2514 \ 2515 develop(bool, Use24BitFP, true, \ 2516 "use FP instructions that produce 24-bit precise results") \ 2517 \ 2518 develop(bool, UseStrictFP, true, \ 2519 "use strict fp if modifier strictfp is set") \ 2520 \ 2521 develop(bool, GenerateSynchronizationCode, true, \ 2522 "generate locking/unlocking code for synchronized methods and " \ 2523 "monitors") \ 2524 \ 2525 develop(bool, GenerateCompilerNullChecks, true, \ 2526 "Generate explicit null checks for loads/stores/calls") \ 2527 \ 2528 develop(bool, GenerateRangeChecks, true, \ 2529 "Generate range checks for array accesses") \ 2530 \ 2531 develop_pd(bool, ImplicitNullChecks, \ 2532 "generate code for implicit null checks") \ 2533 \ 2534 product(bool, PrintSafepointStatistics, false, \ 2535 "print statistics about safepoint synchronization") \ 2536 \ 2537 product(intx, PrintSafepointStatisticsCount, 300, \ 2538 "total number of safepoint statistics collected " \ 2539 "before printing them out") \ 2540 \ 2541 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2542 "print safepoint statistics only when safepoint takes" \ 2543 " more than PrintSafepointSatisticsTimeout in millis") \ 2544 \ 2545 product(bool, TraceSafepointCleanupTime, false, \ 2546 "print the break down of clean up tasks performed during" \ 2547 " safepoint") \ 2548 \ 2549 develop(bool, InlineAccessors, true, \ 2550 "inline accessor methods (get/set)") \ 2551 \ 2552 product(bool, Inline, true, \ 2553 "enable inlining") \ 2554 \ 2555 product(bool, ClipInlining, true, \ 2556 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2557 \ 2558 develop(bool, UseCHA, true, \ 2559 "enable CHA") \ 2560 \ 2561 product(bool, UseTypeProfile, true, \ 2562 "Check interpreter profile for historically monomorphic calls") \ 2563 \ 2564 product(intx, TypeProfileMajorReceiverPercent, 90, \ 2565 "% of major receiver type to all profiled receivers") \ 2566 \ 2567 notproduct(bool, TimeCompiler, false, \ 2568 "time the compiler") \ 2569 \ 2570 notproduct(bool, TimeCompiler2, false, \ 2571 "detailed time the compiler (requires +TimeCompiler)") \ 2572 \ 2573 diagnostic(bool, PrintInlining, false, \ 2574 "prints inlining optimizations") \ 2575 \ 2576 diagnostic(bool, PrintIntrinsics, false, \ 2577 "prints attempted and successful inlining of intrinsics") \ 2578 \ 2579 product(bool, UseCountLeadingZerosInstruction, false, \ 2580 "Use count leading zeros instruction") \ 2581 \ 2582 product(bool, UsePopCountInstruction, false, \ 2583 "Use population count instruction") \ 2584 \ 2585 diagnostic(ccstrlist, DisableIntrinsic, "", \ 2586 "do not expand intrinsics whose (internal) names appear here") \ 2587 \ 2588 develop(bool, StressReflectiveCode, false, \ 2589 "Use inexact types at allocations, etc., to test reflection") \ 2590 \ 2591 develop(bool, EagerInitialization, false, \ 2592 "Eagerly initialize classes if possible") \ 2593 \ 2594 develop(bool, TraceMethodReplacement, false, \ 2595 "Print when methods are replaced do to recompilation") \ 2596 \ 2597 develop(bool, PrintMethodFlushing, false, \ 2598 "print the nmethods being flushed") \ 2599 \ 2600 notproduct(bool, LogMultipleMutexLocking, false, \ 2601 "log locking and unlocking of mutexes (only if multiple locks " \ 2602 "are held)") \ 2603 \ 2604 develop(bool, UseRelocIndex, false, \ 2605 "use an index to speed random access to relocations") \ 2606 \ 2607 develop(bool, StressCodeBuffers, false, \ 2608 "Exercise code buffer expansion and other rare state changes") \ 2609 \ 2610 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2611 "Generate extra debugging info for non-safepoints in nmethods") \ 2612 \ 2613 diagnostic(bool, DebugInlinedCalls, true, \ 2614 "If false, restricts profiled locations to the root method only") \ 2615 \ 2616 product(bool, PrintVMOptions, false, \ 2617 "Print flags that appeared on the command line") \ 2618 \ 2619 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2620 "Ignore unrecognized VM options") \ 2621 \ 2622 product(bool, PrintCommandLineFlags, false, \ 2623 "Print flags specified on command line or set by ergonomics") \ 2624 \ 2625 product(bool, PrintFlagsInitial, false, \ 2626 "Print all VM flags before argument processing and exit VM") \ 2627 \ 2628 product(bool, PrintFlagsFinal, false, \ 2629 "Print all VM flags after argument and ergonomic processing") \ 2630 \ 2631 notproduct(bool, PrintFlagsWithComments, false, \ 2632 "Print all VM flags with default values and descriptions and exit")\ 2633 \ 2634 diagnostic(bool, SerializeVMOutput, true, \ 2635 "Use a mutex to serialize output to tty and hotspot.log") \ 2636 \ 2637 diagnostic(bool, DisplayVMOutput, true, \ 2638 "Display all VM output on the tty, independently of LogVMOutput") \ 2639 \ 2640 diagnostic(bool, LogVMOutput, trueInDebug, \ 2641 "Save VM output to hotspot.log, or to LogFile") \ 2642 \ 2643 diagnostic(ccstr, LogFile, NULL, \ 2644 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2645 \ 2646 product(ccstr, ErrorFile, NULL, \ 2647 "If an error occurs, save the error data to this file " \ 2648 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2649 \ 2650 product(bool, DisplayVMOutputToStderr, false, \ 2651 "If DisplayVMOutput is true, display all VM output to stderr") \ 2652 \ 2653 product(bool, DisplayVMOutputToStdout, false, \ 2654 "If DisplayVMOutput is true, display all VM output to stdout") \ 2655 \ 2656 product(bool, UseHeavyMonitors, false, \ 2657 "use heavyweight instead of lightweight Java monitors") \ 2658 \ 2659 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2660 "print histogram of the symbol table") \ 2661 \ 2662 notproduct(bool, ExitVMOnVerifyError, false, \ 2663 "standard exit from VM if bytecode verify error " \ 2664 "(only in debug mode)") \ 2665 \ 2666 notproduct(ccstr, AbortVMOnException, NULL, \ 2667 "Call fatal if this exception is thrown. Example: " \ 2668 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2669 \ 2670 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2671 "Call fatal if the exception pointed by AbortVMOnException " \ 2672 "has this message.") \ 2673 \ 2674 develop(bool, DebugVtables, false, \ 2675 "add debugging code to vtable dispatch") \ 2676 \ 2677 develop(bool, PrintVtables, false, \ 2678 "print vtables when printing klass") \ 2679 \ 2680 notproduct(bool, PrintVtableStats, false, \ 2681 "print vtables stats at end of run") \ 2682 \ 2683 develop(bool, TraceCreateZombies, false, \ 2684 "trace creation of zombie nmethods") \ 2685 \ 2686 notproduct(bool, IgnoreLockingAssertions, false, \ 2687 "disable locking assertions (for speed)") \ 2688 \ 2689 notproduct(bool, VerifyLoopOptimizations, false, \ 2690 "verify major loop optimizations") \ 2691 \ 2692 product(bool, RangeCheckElimination, true, \ 2693 "Split loop iterations to eliminate range checks") \ 2694 \ 2695 develop_pd(bool, UncommonNullCast, \ 2696 "track occurrences of null in casts; adjust compiler tactics") \ 2697 \ 2698 develop(bool, TypeProfileCasts, true, \ 2699 "treat casts like calls for purposes of type profiling") \ 2700 \ 2701 develop(bool, MonomorphicArrayCheck, true, \ 2702 "Uncommon-trap array store checks that require full type check") \ 2703 \ 2704 diagnostic(bool, ProfileDynamicTypes, true, \ 2705 "do extra type profiling and use it more aggressively") \ 2706 \ 2707 develop(bool, DelayCompilationDuringStartup, true, \ 2708 "Delay invoking the compiler until main application class is " \ 2709 "loaded") \ 2710 \ 2711 develop(bool, CompileTheWorld, false, \ 2712 "Compile all methods in all classes in bootstrap class path " \ 2713 "(stress test)") \ 2714 \ 2715 develop(bool, CompileTheWorldPreloadClasses, true, \ 2716 "Preload all classes used by a class before start loading") \ 2717 \ 2718 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2719 "Force a safepoint every n compiles so sweeper can keep up") \ 2720 \ 2721 develop(bool, TraceIterativeGVN, false, \ 2722 "Print progress during Iterative Global Value Numbering") \ 2723 \ 2724 develop(bool, FillDelaySlots, true, \ 2725 "Fill delay slots (on SPARC only)") \ 2726 \ 2727 develop(bool, VerifyIterativeGVN, false, \ 2728 "Verify Def-Use modifications during sparse Iterative Global " \ 2729 "Value Numbering") \ 2730 \ 2731 notproduct(bool, TracePhaseCCP, false, \ 2732 "Print progress during Conditional Constant Propagation") \ 2733 \ 2734 develop(bool, TimeLivenessAnalysis, false, \ 2735 "Time computation of bytecode liveness analysis") \ 2736 \ 2737 develop(bool, TraceLivenessGen, false, \ 2738 "Trace the generation of liveness analysis information") \ 2739 \ 2740 notproduct(bool, TraceLivenessQuery, false, \ 2741 "Trace queries of liveness analysis information") \ 2742 \ 2743 notproduct(bool, CollectIndexSetStatistics, false, \ 2744 "Collect information about IndexSets") \ 2745 \ 2746 develop(bool, PrintDominators, false, \ 2747 "Print out dominator trees for GVN") \ 2748 \ 2749 develop(bool, UseLoopSafepoints, true, \ 2750 "Generate Safepoint nodes in every loop") \ 2751 \ 2752 notproduct(bool, TraceCISCSpill, false, \ 2753 "Trace allocators use of cisc spillable instructions") \ 2754 \ 2755 notproduct(bool, TraceSpilling, false, \ 2756 "Trace spilling") \ 2757 \ 2758 product(bool, SplitIfBlocks, true, \ 2759 "Clone compares and control flow through merge points to fold " \ 2760 "some branches") \ 2761 \ 2762 develop(intx, FastAllocateSizeLimit, 128*K, \ 2763 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2764 "Inline allocations larger than this in doublewords must go slow")\ 2765 \ 2766 product(bool, AggressiveOpts, false, \ 2767 "Enable aggressive optimizations - see arguments.cpp") \ 2768 \ 2769 product(bool, UseStringCache, false, \ 2770 "Enable String cache capabilities on String.java") \ 2771 \ 2772 /* statistics */ \ 2773 develop(bool, CountCompiledCalls, false, \ 2774 "counts method invocations") \ 2775 \ 2776 notproduct(bool, CountRuntimeCalls, false, \ 2777 "counts VM runtime calls") \ 2778 \ 2779 develop(bool, CountJNICalls, false, \ 2780 "counts jni method invocations") \ 2781 \ 2782 notproduct(bool, CountJVMCalls, false, \ 2783 "counts jvm method invocations") \ 2784 \ 2785 notproduct(bool, CountRemovableExceptions, false, \ 2786 "count exceptions that could be replaced by branches due to " \ 2787 "inlining") \ 2788 \ 2789 notproduct(bool, ICMissHistogram, false, \ 2790 "produce histogram of IC misses") \ 2791 \ 2792 notproduct(bool, PrintClassStatistics, false, \ 2793 "prints class statistics at end of run") \ 2794 \ 2795 notproduct(bool, PrintMethodStatistics, false, \ 2796 "prints method statistics at end of run") \ 2797 \ 2798 /* interpreter */ \ 2799 develop(bool, ClearInterpreterLocals, false, \ 2800 "Always clear local variables of interpreter activations upon " \ 2801 "entry") \ 2802 \ 2803 product_pd(bool, RewriteBytecodes, \ 2804 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2805 \ 2806 product_pd(bool, RewriteFrequentPairs, \ 2807 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2808 \ 2809 diagnostic(bool, PrintInterpreter, false, \ 2810 "Prints the generated interpreter code") \ 2811 \ 2812 product(bool, UseInterpreter, true, \ 2813 "Use interpreter for non-compiled methods") \ 2814 \ 2815 develop(bool, UseFastSignatureHandlers, true, \ 2816 "Use fast signature handlers for native calls") \ 2817 \ 2818 develop(bool, UseV8InstrsOnly, false, \ 2819 "Use SPARC-V8 Compliant instruction subset") \ 2820 \ 2821 product(bool, UseNiagaraInstrs, false, \ 2822 "Use Niagara-efficient instruction subset") \ 2823 \ 2824 develop(bool, UseCASForSwap, false, \ 2825 "Do not use swap instructions, but only CAS (in a loop) on SPARC")\ 2826 \ 2827 product(bool, UseLoopCounter, true, \ 2828 "Increment invocation counter on backward branch") \ 2829 \ 2830 product(bool, UseFastEmptyMethods, true, \ 2831 "Use fast method entry code for empty methods") \ 2832 \ 2833 product(bool, UseFastAccessorMethods, true, \ 2834 "Use fast method entry code for accessor methods") \ 2835 \ 2836 product_pd(bool, UseOnStackReplacement, \ 2837 "Use on stack replacement, calls runtime if invoc. counter " \ 2838 "overflows in loop") \ 2839 \ 2840 notproduct(bool, TraceOnStackReplacement, false, \ 2841 "Trace on stack replacement") \ 2842 \ 2843 develop(bool, PoisonOSREntry, true, \ 2844 "Detect abnormal calls to OSR code") \ 2845 \ 2846 product_pd(bool, PreferInterpreterNativeStubs, \ 2847 "Use always interpreter stubs for native methods invoked via " \ 2848 "interpreter") \ 2849 \ 2850 develop(bool, CountBytecodes, false, \ 2851 "Count number of bytecodes executed") \ 2852 \ 2853 develop(bool, PrintBytecodeHistogram, false, \ 2854 "Print histogram of the executed bytecodes") \ 2855 \ 2856 develop(bool, PrintBytecodePairHistogram, false, \ 2857 "Print histogram of the executed bytecode pairs") \ 2858 \ 2859 diagnostic(bool, PrintSignatureHandlers, false, \ 2860 "Print code generated for native method signature handlers") \ 2861 \ 2862 develop(bool, VerifyOops, false, \ 2863 "Do plausibility checks for oops") \ 2864 \ 2865 develop(bool, CheckUnhandledOops, false, \ 2866 "Check for unhandled oops in VM code") \ 2867 \ 2868 develop(bool, VerifyJNIFields, trueInDebug, \ 2869 "Verify jfieldIDs for instance fields") \ 2870 \ 2871 notproduct(bool, VerifyJNIEnvThread, false, \ 2872 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2873 "from JNI") \ 2874 \ 2875 develop(bool, VerifyFPU, false, \ 2876 "Verify FPU state (check for NaN's, etc.)") \ 2877 \ 2878 develop(bool, VerifyThread, false, \ 2879 "Watch the thread register for corruption (SPARC only)") \ 2880 \ 2881 develop(bool, VerifyActivationFrameSize, false, \ 2882 "Verify that activation frame didn't become smaller than its " \ 2883 "minimal size") \ 2884 \ 2885 develop(bool, TraceFrequencyInlining, false, \ 2886 "Trace frequency based inlining") \ 2887 \ 2888 notproduct(bool, TraceTypeProfile, false, \ 2889 "Trace type profile") \ 2890 \ 2891 develop_pd(bool, InlineIntrinsics, \ 2892 "Inline intrinsics that can be statically resolved") \ 2893 \ 2894 product_pd(bool, ProfileInterpreter, \ 2895 "Profile at the bytecode level during interpretation") \ 2896 \ 2897 develop_pd(bool, ProfileTraps, \ 2898 "Profile deoptimization traps at the bytecode level") \ 2899 \ 2900 product(intx, ProfileMaturityPercentage, 20, \ 2901 "number of method invocations/branches (expressed as % of " \ 2902 "CompileThreshold) before using the method's profile") \ 2903 \ 2904 develop(bool, PrintMethodData, false, \ 2905 "Print the results of +ProfileInterpreter at end of run") \ 2906 \ 2907 develop(bool, VerifyDataPointer, trueInDebug, \ 2908 "Verify the method data pointer during interpreter profiling") \ 2909 \ 2910 develop(bool, VerifyCompiledCode, false, \ 2911 "Include miscellaneous runtime verifications in nmethod code; " \ 2912 "default off because it disturbs nmethod size heuristics") \ 2913 \ 2914 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2915 "Manually make GC thread crash then dump java stack trace; " \ 2916 "Test only") \ 2917 \ 2918 /* compilation */ \ 2919 product(bool, UseCompiler, true, \ 2920 "use compilation") \ 2921 \ 2922 develop(bool, TraceCompilationPolicy, false, \ 2923 "Trace compilation policy") \ 2924 \ 2925 develop(bool, TimeCompilationPolicy, false, \ 2926 "Time the compilation policy") \ 2927 \ 2928 product(bool, UseCounterDecay, true, \ 2929 "adjust recompilation counters") \ 2930 \ 2931 develop(intx, CounterHalfLifeTime, 30, \ 2932 "half-life time of invocation counters (in secs)") \ 2933 \ 2934 develop(intx, CounterDecayMinIntervalLength, 500, \ 2935 "Min. ms. between invocation of CounterDecay") \ 2936 \ 2937 product(bool, AlwaysCompileLoopMethods, false, \ 2938 "when using recompilation, never interpret methods " \ 2939 "containing loops") \ 2940 \ 2941 product(bool, DontCompileHugeMethods, true, \ 2942 "don't compile methods > HugeMethodLimit") \ 2943 \ 2944 /* Bytecode escape analysis estimation. */ \ 2945 product(bool, EstimateArgEscape, true, \ 2946 "Analyze bytecodes to estimate escape state of arguments") \ 2947 \ 2948 product(intx, BCEATraceLevel, 0, \ 2949 "How much tracing to do of bytecode escape analysis estimates") \ 2950 \ 2951 product(intx, MaxBCEAEstimateLevel, 5, \ 2952 "Maximum number of nested calls that are analyzed by BC EA.") \ 2953 \ 2954 product(intx, MaxBCEAEstimateSize, 150, \ 2955 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2956 \ 2957 product(intx, AllocatePrefetchStyle, 1, \ 2958 "0 = no prefetch, " \ 2959 "1 = prefetch instructions for each allocation, " \ 2960 "2 = use TLAB watermark to gate allocation prefetch, " \ 2961 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2962 \ 2963 product(intx, AllocatePrefetchDistance, -1, \ 2964 "Distance to prefetch ahead of allocation pointer") \ 2965 \ 2966 product(intx, AllocatePrefetchLines, 3, \ 2967 "Number of lines to prefetch ahead of array allocation pointer") \ 2968 \ 2969 product(intx, AllocateInstancePrefetchLines, 1, \ 2970 "Number of lines to prefetch ahead of instance allocation pointer") \ 2971 \ 2972 product(intx, AllocatePrefetchStepSize, 16, \ 2973 "Step size in bytes of sequential prefetch instructions") \ 2974 \ 2975 product(intx, AllocatePrefetchInstr, 0, \ 2976 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2977 \ 2978 product(intx, ReadPrefetchInstr, 0, \ 2979 "Prefetch instruction to prefetch ahead") \ 2980 \ 2981 product(uintx, ArraycopySrcPrefetchDistance, 0, \ 2982 "Distance to prefetch source array in arracopy") \ 2983 \ 2984 product(uintx, ArraycopyDstPrefetchDistance, 0, \ 2985 "Distance to prefetch destination array in arracopy") \ 2986 \ 2987 /* deoptimization */ \ 2988 develop(bool, TraceDeoptimization, false, \ 2989 "Trace deoptimization") \ 2990 \ 2991 develop(bool, DebugDeoptimization, false, \ 2992 "Tracing various information while debugging deoptimization") \ 2993 \ 2994 product(intx, SelfDestructTimer, 0, \ 2995 "Will cause VM to terminate after a given time (in minutes) " \ 2996 "(0 means off)") \ 2997 \ 2998 product(intx, MaxJavaStackTraceDepth, 1024, \ 2999 "Max. no. of lines in the stack trace for Java exceptions " \ 3000 "(0 means all)") \ 3001 \ 3002 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 3003 "Guarantee a safepoint (at least) every so many milliseconds " \ 3004 "(0 means none)")) \ 3005 \ 3006 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 3007 "Guarantee a safepoint (at least) every so many milliseconds " \ 3008 "(0 means none)")) \ 3009 \ 3010 product(intx, SafepointTimeoutDelay, 10000, \ 3011 "Delay in milliseconds for option SafepointTimeout") \ 3012 \ 3013 product(intx, NmethodSweepFraction, 4, \ 3014 "Number of invocations of sweeper to cover all nmethods") \ 3015 \ 3016 product(intx, NmethodSweepCheckInterval, 5, \ 3017 "Compilers wake up every n seconds to possibly sweep nmethods") \ 3018 \ 3019 notproduct(bool, LogSweeper, false, \ 3020 "Keep a ring buffer of sweeper activity") \ 3021 \ 3022 notproduct(intx, SweeperLogEntries, 1024, \ 3023 "Number of records in the ring buffer of sweeper activity") \ 3024 \ 3025 notproduct(intx, MemProfilingInterval, 500, \ 3026 "Time between each invocation of the MemProfiler") \ 3027 \ 3028 develop(intx, MallocCatchPtr, -1, \ 3029 "Hit breakpoint when mallocing/freeing this pointer") \ 3030 \ 3031 notproduct(intx, AssertRepeat, 1, \ 3032 "number of times to evaluate expression in assert " \ 3033 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 3034 \ 3035 notproduct(ccstrlist, SuppressErrorAt, "", \ 3036 "List of assertions (file:line) to muzzle") \ 3037 \ 3038 notproduct(uintx, HandleAllocationLimit, 1024, \ 3039 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 3040 "is used") \ 3041 \ 3042 develop(uintx, TotalHandleAllocationLimit, 1024, \ 3043 "Threshold for total handle allocation when " \ 3044 "+TraceHandleAllocation is used") \ 3045 \ 3046 develop(intx, StackPrintLimit, 100, \ 3047 "number of stack frames to print in VM-level stack dump") \ 3048 \ 3049 notproduct(intx, MaxElementPrintSize, 256, \ 3050 "maximum number of elements to print") \ 3051 \ 3052 notproduct(intx, MaxSubklassPrintSize, 4, \ 3053 "maximum number of subklasses to print when printing klass") \ 3054 \ 3055 product(intx, MaxInlineLevel, 9, \ 3056 "maximum number of nested calls that are inlined") \ 3057 \ 3058 product(intx, MaxRecursiveInlineLevel, 1, \ 3059 "maximum number of nested recursive calls that are inlined") \ 3060 \ 3061 product_pd(intx, InlineSmallCode, \ 3062 "Only inline already compiled methods if their code size is " \ 3063 "less than this") \ 3064 \ 3065 product(intx, MaxInlineSize, 35, \ 3066 "maximum bytecode size of a method to be inlined") \ 3067 \ 3068 product_pd(intx, FreqInlineSize, \ 3069 "maximum bytecode size of a frequent method to be inlined") \ 3070 \ 3071 product(intx, MaxTrivialSize, 6, \ 3072 "maximum bytecode size of a trivial method to be inlined") \ 3073 \ 3074 product(intx, MinInliningThreshold, 250, \ 3075 "min. invocation count a method needs to have to be inlined") \ 3076 \ 3077 develop(intx, AlignEntryCode, 4, \ 3078 "aligns entry code to specified value (in bytes)") \ 3079 \ 3080 develop(intx, MethodHistogramCutoff, 100, \ 3081 "cutoff value for method invoc. histogram (+CountCalls)") \ 3082 \ 3083 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3084 "# of interpreted methods to show in profile") \ 3085 \ 3086 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3087 "# of compiled methods to show in profile") \ 3088 \ 3089 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3090 "# of stub methods to show in profile") \ 3091 \ 3092 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3093 "# of runtime stub nodes to show in profile") \ 3094 \ 3095 product(intx, ProfileIntervalsTicks, 100, \ 3096 "# of ticks between printing of interval profile " \ 3097 "(+ProfileIntervals)") \ 3098 \ 3099 notproduct(intx, ScavengeALotInterval, 1, \ 3100 "Interval between which scavenge will occur with +ScavengeALot") \ 3101 \ 3102 notproduct(intx, FullGCALotInterval, 1, \ 3103 "Interval between which full gc will occur with +FullGCALot") \ 3104 \ 3105 notproduct(intx, FullGCALotStart, 0, \ 3106 "For which invocation to start FullGCAlot") \ 3107 \ 3108 notproduct(intx, FullGCALotDummies, 32*K, \ 3109 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3110 "to move") \ 3111 \ 3112 develop(intx, DontYieldALotInterval, 10, \ 3113 "Interval between which yields will be dropped (milliseconds)") \ 3114 \ 3115 develop(intx, MinSleepInterval, 1, \ 3116 "Minimum sleep() interval (milliseconds) when " \ 3117 "ConvertSleepToYield is off (used for SOLARIS)") \ 3118 \ 3119 product(intx, EventLogLength, 2000, \ 3120 "maximum nof events in event log") \ 3121 \ 3122 develop(intx, ProfilerPCTickThreshold, 15, \ 3123 "Number of ticks in a PC buckets to be a hotspot") \ 3124 \ 3125 notproduct(intx, DeoptimizeALotInterval, 5, \ 3126 "Number of exits until DeoptimizeALot kicks in") \ 3127 \ 3128 notproduct(intx, ZombieALotInterval, 5, \ 3129 "Number of exits until ZombieALot kicks in") \ 3130 \ 3131 develop(bool, StressNonEntrant, false, \ 3132 "Mark nmethods non-entrant at registration") \ 3133 \ 3134 diagnostic(intx, MallocVerifyInterval, 0, \ 3135 "if non-zero, verify C heap after every N calls to " \ 3136 "malloc/realloc/free") \ 3137 \ 3138 diagnostic(intx, MallocVerifyStart, 0, \ 3139 "if non-zero, start verifying C heap after Nth call to " \ 3140 "malloc/realloc/free") \ 3141 \ 3142 product(intx, TypeProfileWidth, 2, \ 3143 "number of receiver types to record in call/cast profile") \ 3144 \ 3145 develop(intx, BciProfileWidth, 2, \ 3146 "number of return bci's to record in ret profile") \ 3147 \ 3148 product(intx, PerMethodRecompilationCutoff, 400, \ 3149 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3150 \ 3151 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3152 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3153 \ 3154 product(intx, PerMethodTrapLimit, 100, \ 3155 "Limit on traps (of one kind) in a method (includes inlines)") \ 3156 \ 3157 product(intx, PerBytecodeTrapLimit, 4, \ 3158 "Limit on traps (of one kind) at a particular BCI") \ 3159 \ 3160 develop(intx, FreqCountInvocations, 1, \ 3161 "Scaling factor for branch frequencies (deprecated)") \ 3162 \ 3163 develop(intx, InlineFrequencyRatio, 20, \ 3164 "Ratio of call site execution to caller method invocation") \ 3165 \ 3166 develop_pd(intx, InlineFrequencyCount, \ 3167 "Count of call site execution necessary to trigger frequent " \ 3168 "inlining") \ 3169 \ 3170 develop(intx, InlineThrowCount, 50, \ 3171 "Force inlining of interpreted methods that throw this often") \ 3172 \ 3173 develop(intx, InlineThrowMaxSize, 200, \ 3174 "Force inlining of throwing methods smaller than this") \ 3175 \ 3176 product(intx, AliasLevel, 3, \ 3177 "0 for no aliasing, 1 for oop/field/static/array split, " \ 3178 "2 for class split, 3 for unique instances") \ 3179 \ 3180 develop(bool, VerifyAliases, false, \ 3181 "perform extra checks on the results of alias analysis") \ 3182 \ 3183 develop(intx, ProfilerNodeSize, 1024, \ 3184 "Size in K to allocate for the Profile Nodes of each thread") \ 3185 \ 3186 develop(intx, V8AtomicOperationUnderLockSpinCount, 50, \ 3187 "Number of times to spin wait on a v8 atomic operation lock") \ 3188 \ 3189 product(intx, ReadSpinIterations, 100, \ 3190 "Number of read attempts before a yield (spin inner loop)") \ 3191 \ 3192 product_pd(intx, PreInflateSpin, \ 3193 "Number of times to spin wait before inflation") \ 3194 \ 3195 product(intx, PreBlockSpin, 10, \ 3196 "Number of times to spin in an inflated lock before going to " \ 3197 "an OS lock") \ 3198 \ 3199 /* gc parameters */ \ 3200 product(uintx, InitialHeapSize, 0, \ 3201 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 3202 \ 3203 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3204 "Maximum heap size (in bytes)") \ 3205 \ 3206 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3207 "Initial tenured generation size (in bytes)") \ 3208 \ 3209 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3210 "Initial new generation size (in bytes)") \ 3211 \ 3212 product(uintx, MaxNewSize, max_uintx, \ 3213 "Maximum new generation size (in bytes), max_uintx means set " \ 3214 "ergonomically") \ 3215 \ 3216 product(uintx, PretenureSizeThreshold, 0, \ 3217 "Maximum size in bytes of objects allocated in DefNew " \ 3218 "generation; zero means no maximum") \ 3219 \ 3220 product(uintx, TLABSize, 0, \ 3221 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3222 \ 3223 product(uintx, MinTLABSize, 2*K, \ 3224 "Minimum allowed TLAB size (in bytes)") \ 3225 \ 3226 product(uintx, TLABAllocationWeight, 35, \ 3227 "Allocation averaging weight") \ 3228 \ 3229 product(uintx, TLABWasteTargetPercent, 1, \ 3230 "Percentage of Eden that can be wasted") \ 3231 \ 3232 product(uintx, TLABRefillWasteFraction, 64, \ 3233 "Max TLAB waste at a refill (internal fragmentation)") \ 3234 \ 3235 product(uintx, TLABWasteIncrement, 4, \ 3236 "Increment allowed waste at slow allocation") \ 3237 \ 3238 product(intx, SurvivorRatio, 8, \ 3239 "Ratio of eden/survivor space size") \ 3240 \ 3241 product(intx, NewRatio, 2, \ 3242 "Ratio of new/old generation sizes") \ 3243 \ 3244 product_pd(uintx, NewSizeThreadIncrease, \ 3245 "Additional size added to desired new generation size per " \ 3246 "non-daemon thread (in bytes)") \ 3247 \ 3248 product_pd(uintx, PermSize, \ 3249 "Initial size of permanent generation (in bytes)") \ 3250 \ 3251 product_pd(uintx, MaxPermSize, \ 3252 "Maximum size of permanent generation (in bytes)") \ 3253 \ 3254 product(uintx, MinHeapFreeRatio, 40, \ 3255 "Min percentage of heap free after GC to avoid expansion") \ 3256 \ 3257 product(uintx, MaxHeapFreeRatio, 70, \ 3258 "Max percentage of heap free after GC to avoid shrinking") \ 3259 \ 3260 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3261 "Number of milliseconds per MB of free space in the heap") \ 3262 \ 3263 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3264 "Min change in heap space due to GC (in bytes)") \ 3265 \ 3266 product(uintx, MinPermHeapExpansion, ScaleForWordSize(256*K), \ 3267 "Min expansion of permanent heap (in bytes)") \ 3268 \ 3269 product(uintx, MaxPermHeapExpansion, ScaleForWordSize(4*M), \ 3270 "Max expansion of permanent heap without full GC (in bytes)") \ 3271 \ 3272 product(intx, QueuedAllocationWarningCount, 0, \ 3273 "Number of times an allocation that queues behind a GC " \ 3274 "will retry before printing a warning") \ 3275 \ 3276 diagnostic(uintx, VerifyGCStartAt, 0, \ 3277 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3278 \ 3279 diagnostic(intx, VerifyGCLevel, 0, \ 3280 "Generation level at which to start +VerifyBefore/AfterGC") \ 3281 \ 3282 develop(uintx, ExitAfterGCNum, 0, \ 3283 "If non-zero, exit after this GC.") \ 3284 \ 3285 product(intx, MaxTenuringThreshold, 15, \ 3286 "Maximum value for tenuring threshold") \ 3287 \ 3288 product(intx, InitialTenuringThreshold, 7, \ 3289 "Initial value for tenuring threshold") \ 3290 \ 3291 product(intx, TargetSurvivorRatio, 50, \ 3292 "Desired percentage of survivor space used after scavenge") \ 3293 \ 3294 product(uintx, MarkSweepDeadRatio, 5, \ 3295 "Percentage (0-100) of the old gen allowed as dead wood." \ 3296 "Serial mark sweep treats this as both the min and max value." \ 3297 "CMS uses this value only if it falls back to mark sweep." \ 3298 "Par compact uses a variable scale based on the density of the" \ 3299 "generation and treats this as the max value when the heap is" \ 3300 "either completely full or completely empty. Par compact also" \ 3301 "has a smaller default value; see arguments.cpp.") \ 3302 \ 3303 product(uintx, PermMarkSweepDeadRatio, 20, \ 3304 "Percentage (0-100) of the perm gen allowed as dead wood." \ 3305 "See MarkSweepDeadRatio for collector-specific comments.") \ 3306 \ 3307 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3308 "How often should we fully compact the heap (ignoring the dead " \ 3309 "space parameters)") \ 3310 \ 3311 product(intx, PrintCMSStatistics, 0, \ 3312 "Statistics for CMS") \ 3313 \ 3314 product(bool, PrintCMSInitiationStatistics, false, \ 3315 "Statistics for initiating a CMS collection") \ 3316 \ 3317 product(intx, PrintFLSStatistics, 0, \ 3318 "Statistics for CMS' FreeListSpace") \ 3319 \ 3320 product(intx, PrintFLSCensus, 0, \ 3321 "Census for CMS' FreeListSpace") \ 3322 \ 3323 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3324 "Delay in ms between expansion and allocation") \ 3325 \ 3326 product(intx, DeferThrSuspendLoopCount, 4000, \ 3327 "(Unstable) Number of times to iterate in safepoint loop " \ 3328 " before blocking VM threads ") \ 3329 \ 3330 product(intx, DeferPollingPageLoopCount, -1, \ 3331 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3332 "before changing safepoint polling page to RO ") \ 3333 \ 3334 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3335 \ 3336 product(bool, PSChunkLargeArrays, true, \ 3337 "true: process large arrays in chunks") \ 3338 \ 3339 product(uintx, GCDrainStackTargetSize, 64, \ 3340 "how many entries we'll try to leave on the stack during " \ 3341 "parallel GC") \ 3342 \ 3343 /* stack parameters */ \ 3344 product_pd(intx, StackYellowPages, \ 3345 "Number of yellow zone (recoverable overflows) pages") \ 3346 \ 3347 product_pd(intx, StackRedPages, \ 3348 "Number of red zone (unrecoverable overflows) pages") \ 3349 \ 3350 product_pd(intx, StackShadowPages, \ 3351 "Number of shadow zone (for overflow checking) pages" \ 3352 " this should exceed the depth of the VM and native call stack") \ 3353 \ 3354 product_pd(intx, ThreadStackSize, \ 3355 "Thread Stack Size (in Kbytes)") \ 3356 \ 3357 product_pd(intx, VMThreadStackSize, \ 3358 "Non-Java Thread Stack Size (in Kbytes)") \ 3359 \ 3360 product_pd(intx, CompilerThreadStackSize, \ 3361 "Compiler Thread Stack Size (in Kbytes)") \ 3362 \ 3363 develop_pd(uintx, JVMInvokeMethodSlack, \ 3364 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3365 \ 3366 product(uintx, ThreadSafetyMargin, 50*M, \ 3367 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3368 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3369 "disable this feature") \ 3370 \ 3371 /* code cache parameters */ \ 3372 develop(uintx, CodeCacheSegmentSize, 64, \ 3373 "Code cache segment size (in bytes) - smallest unit of " \ 3374 "allocation") \ 3375 \ 3376 develop_pd(intx, CodeEntryAlignment, \ 3377 "Code entry alignment for generated code (in bytes)") \ 3378 \ 3379 product_pd(intx, OptoLoopAlignment, \ 3380 "Align inner loops to zero relative to this modulus") \ 3381 \ 3382 product_pd(uintx, InitialCodeCacheSize, \ 3383 "Initial code cache size (in bytes)") \ 3384 \ 3385 product_pd(uintx, ReservedCodeCacheSize, \ 3386 "Reserved code cache size (in bytes) - maximum code cache size") \ 3387 \ 3388 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3389 "When less than X space left, we stop compiling.") \ 3390 \ 3391 product_pd(uintx, CodeCacheExpansionSize, \ 3392 "Code cache expansion size (in bytes)") \ 3393 \ 3394 develop_pd(uintx, CodeCacheMinBlockLength, \ 3395 "Minimum number of segments in a code cache block.") \ 3396 \ 3397 notproduct(bool, ExitOnFullCodeCache, false, \ 3398 "Exit the VM if we fill the code cache.") \ 3399 \ 3400 product(bool, UseCodeCacheFlushing, true, \ 3401 "Attempt to clean the code cache before shutting off compiler") \ 3402 \ 3403 product(intx, MinCodeCacheFlushingInterval, 30, \ 3404 "Min number of seconds between code cache cleaning sessions") \ 3405 \ 3406 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3407 "When less than X space left, start code cache cleaning") \ 3408 \ 3409 /* interpreter debugging */ \ 3410 develop(intx, BinarySwitchThreshold, 5, \ 3411 "Minimal number of lookupswitch entries for rewriting to binary " \ 3412 "switch") \ 3413 \ 3414 develop(intx, StopInterpreterAt, 0, \ 3415 "Stops interpreter execution at specified bytecode number") \ 3416 \ 3417 develop(intx, TraceBytecodesAt, 0, \ 3418 "Traces bytecodes starting with specified bytecode number") \ 3419 \ 3420 /* compiler interface */ \ 3421 develop(intx, CIStart, 0, \ 3422 "the id of the first compilation to permit") \ 3423 \ 3424 develop(intx, CIStop, -1, \ 3425 "the id of the last compilation to permit") \ 3426 \ 3427 develop(intx, CIStartOSR, 0, \ 3428 "the id of the first osr compilation to permit " \ 3429 "(CICountOSR must be on)") \ 3430 \ 3431 develop(intx, CIStopOSR, -1, \ 3432 "the id of the last osr compilation to permit " \ 3433 "(CICountOSR must be on)") \ 3434 \ 3435 develop(intx, CIBreakAtOSR, -1, \ 3436 "id of osr compilation to break at") \ 3437 \ 3438 develop(intx, CIBreakAt, -1, \ 3439 "id of compilation to break at") \ 3440 \ 3441 product(ccstrlist, CompileOnly, "", \ 3442 "List of methods (pkg/class.name) to restrict compilation to") \ 3443 \ 3444 product(ccstr, CompileCommandFile, NULL, \ 3445 "Read compiler commands from this file [.hotspot_compiler]") \ 3446 \ 3447 product(ccstrlist, CompileCommand, "", \ 3448 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3449 \ 3450 product(bool, CICompilerCountPerCPU, false, \ 3451 "1 compiler thread for log(N CPUs)") \ 3452 \ 3453 develop(intx, CIFireOOMAt, -1, \ 3454 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3455 "(non-negative value throws OOM after this many CI accesses " \ 3456 "in each compile)") \ 3457 \ 3458 develop(intx, CIFireOOMAtDelay, -1, \ 3459 "Wait for this many CI accesses to occur in all compiles before " \ 3460 "beginning to throw OutOfMemoryErrors in each compile") \ 3461 \ 3462 notproduct(bool, CIObjectFactoryVerify, false, \ 3463 "enable potentially expensive verification in ciObjectFactory") \ 3464 \ 3465 /* Priorities */ \ 3466 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3467 \ 3468 product(intx, ThreadPriorityPolicy, 0, \ 3469 "0 : Normal. "\ 3470 " VM chooses priorities that are appropriate for normal "\ 3471 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3472 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3473 " map to lower native priority values. On Windows applications"\ 3474 " are allowed to use higher native priorities. However, with "\ 3475 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3476 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3477 " interfere with system threads. On Linux thread priorities "\ 3478 " are ignored because the OS does not support static priority "\ 3479 " in SCHED_OTHER scheduling class which is the only choice for"\ 3480 " non-root, non-realtime applications. "\ 3481 "1 : Aggressive. "\ 3482 " Java thread priorities map over to the entire range of "\ 3483 " native thread priorities. Higher Java thread priorities map "\ 3484 " to higher native thread priorities. This policy should be "\ 3485 " used with care, as sometimes it can cause performance "\ 3486 " degradation in the application and/or the entire system. On "\ 3487 " Linux this policy requires root privilege.") \ 3488 \ 3489 product(bool, ThreadPriorityVerbose, false, \ 3490 "print priority changes") \ 3491 \ 3492 product(intx, DefaultThreadPriority, -1, \ 3493 "what native priority threads run at if not specified elsewhere (-1 means no change)") \ 3494 \ 3495 product(intx, CompilerThreadPriority, -1, \ 3496 "what priority should compiler threads run at (-1 means no change)") \ 3497 \ 3498 product(intx, VMThreadPriority, -1, \ 3499 "what priority should VM threads run at (-1 means no change)") \ 3500 \ 3501 product(bool, CompilerThreadHintNoPreempt, true, \ 3502 "(Solaris only) Give compiler threads an extra quanta") \ 3503 \ 3504 product(bool, VMThreadHintNoPreempt, false, \ 3505 "(Solaris only) Give VM thread an extra quanta") \ 3506 \ 3507 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3508 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3509 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3510 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3511 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3512 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3513 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3514 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3515 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3516 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3517 \ 3518 /* compiler debugging */ \ 3519 notproduct(intx, CompileTheWorldStartAt, 1, \ 3520 "First class to consider when using +CompileTheWorld") \ 3521 \ 3522 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3523 "Last class to consider when using +CompileTheWorld") \ 3524 \ 3525 develop(intx, NewCodeParameter, 0, \ 3526 "Testing Only: Create a dedicated integer parameter before " \ 3527 "putback") \ 3528 \ 3529 /* new oopmap storage allocation */ \ 3530 develop(intx, MinOopMapAllocation, 8, \ 3531 "Minimum number of OopMap entries in an OopMapSet") \ 3532 \ 3533 /* Background Compilation */ \ 3534 develop(intx, LongCompileThreshold, 50, \ 3535 "Used with +TraceLongCompiles") \ 3536 \ 3537 product(intx, StarvationMonitorInterval, 200, \ 3538 "Pause between each check in ms") \ 3539 \ 3540 /* recompilation */ \ 3541 product_pd(intx, CompileThreshold, \ 3542 "number of interpreted method invocations before (re-)compiling") \ 3543 \ 3544 product_pd(intx, BackEdgeThreshold, \ 3545 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3546 \ 3547 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3548 "Interpreter (tier 0) invocation notification frequency.") \ 3549 \ 3550 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3551 "C1 without MDO (tier 2) invocation notification frequency.") \ 3552 \ 3553 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3554 "C1 with MDO profiling (tier 3) invocation notification " \ 3555 "frequency.") \ 3556 \ 3557 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3558 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3559 \ 3560 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3561 "Interpreter (tier 0) invocation notification frequency.") \ 3562 \ 3563 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3564 "C1 without MDO (tier 2) invocation notification frequency.") \ 3565 \ 3566 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3567 "C1 with MDO profiling (tier 3) invocation notification " \ 3568 "frequency.") \ 3569 \ 3570 product(intx, Tier2CompileThreshold, 0, \ 3571 "threshold at which tier 2 compilation is invoked") \ 3572 \ 3573 product(intx, Tier2BackEdgeThreshold, 0, \ 3574 "Back edge threshold at which tier 2 compilation is invoked") \ 3575 \ 3576 product(intx, Tier3InvocationThreshold, 200, \ 3577 "Compile if number of method invocations crosses this " \ 3578 "threshold") \ 3579 \ 3580 product(intx, Tier3MinInvocationThreshold, 100, \ 3581 "Minimum invocation to compile at tier 3") \ 3582 \ 3583 product(intx, Tier3CompileThreshold, 2000, \ 3584 "Threshold at which tier 3 compilation is invoked (invocation " \ 3585 "minimum must be satisfied.") \ 3586 \ 3587 product(intx, Tier3BackEdgeThreshold, 60000, \ 3588 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3589 \ 3590 product(intx, Tier4InvocationThreshold, 5000, \ 3591 "Compile if number of method invocations crosses this " \ 3592 "threshold") \ 3593 \ 3594 product(intx, Tier4MinInvocationThreshold, 600, \ 3595 "Minimum invocation to compile at tier 4") \ 3596 \ 3597 product(intx, Tier4CompileThreshold, 15000, \ 3598 "Threshold at which tier 4 compilation is invoked (invocation " \ 3599 "minimum must be satisfied.") \ 3600 \ 3601 product(intx, Tier4BackEdgeThreshold, 40000, \ 3602 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3603 \ 3604 product(intx, Tier3DelayOn, 5, \ 3605 "If C2 queue size grows over this amount per compiler thread " \ 3606 "stop compiling at tier 3 and start compiling at tier 2") \ 3607 \ 3608 product(intx, Tier3DelayOff, 2, \ 3609 "If C2 queue size is less than this amount per compiler thread " \ 3610 "allow methods compiled at tier 2 transition to tier 3") \ 3611 \ 3612 product(intx, Tier3LoadFeedback, 5, \ 3613 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3614 "reaches this amount per compiler thread") \ 3615 \ 3616 product(intx, Tier4LoadFeedback, 3, \ 3617 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3618 "reaches this amount per compiler thread") \ 3619 \ 3620 product(intx, TieredCompileTaskTimeout, 50, \ 3621 "Kill compile task if method was not used within " \ 3622 "given timeout in milliseconds") \ 3623 \ 3624 product(intx, TieredStopAtLevel, 4, \ 3625 "Stop at given compilation level") \ 3626 \ 3627 product(intx, Tier0ProfilingStartPercentage, 200, \ 3628 "Start profiling in interpreter if the counters exceed tier 3" \ 3629 "thresholds by the specified percentage") \ 3630 \ 3631 product(intx, TieredRateUpdateMinTime, 1, \ 3632 "Minimum rate sampling interval (in milliseconds)") \ 3633 \ 3634 product(intx, TieredRateUpdateMaxTime, 25, \ 3635 "Maximum rate sampling interval (in milliseconds)") \ 3636 \ 3637 product_pd(bool, TieredCompilation, \ 3638 "Enable tiered compilation") \ 3639 \ 3640 product(bool, PrintTieredEvents, false, \ 3641 "Print tiered events notifications") \ 3642 \ 3643 product(bool, StressTieredRuntime, false, \ 3644 "Alternate client and server compiler on compile requests") \ 3645 \ 3646 product_pd(intx, OnStackReplacePercentage, \ 3647 "NON_TIERED number of method invocations/branches (expressed as %"\ 3648 "of CompileThreshold) before (re-)compiling OSR code") \ 3649 \ 3650 product(intx, InterpreterProfilePercentage, 33, \ 3651 "NON_TIERED number of method invocations/branches (expressed as %"\ 3652 "of CompileThreshold) before profiling in the interpreter") \ 3653 \ 3654 develop(intx, MaxRecompilationSearchLength, 10, \ 3655 "max. # frames to inspect searching for recompilee") \ 3656 \ 3657 develop(intx, MaxInterpretedSearchLength, 3, \ 3658 "max. # interp. frames to skip when searching for recompilee") \ 3659 \ 3660 develop(intx, DesiredMethodLimit, 8000, \ 3661 "desired max. method size (in bytecodes) after inlining") \ 3662 \ 3663 develop(intx, HugeMethodLimit, 8000, \ 3664 "don't compile methods larger than this if " \ 3665 "+DontCompileHugeMethods") \ 3666 \ 3667 /* New JDK 1.4 reflection implementation */ \ 3668 \ 3669 develop(bool, UseNewReflection, true, \ 3670 "Temporary flag for transition to reflection based on dynamic " \ 3671 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3672 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3673 "changes were needed") \ 3674 \ 3675 develop(bool, VerifyReflectionBytecodes, false, \ 3676 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3677 "in situations like that described in 4486457 or for " \ 3678 "constructors generated for serialization, so can not be enabled "\ 3679 "in product.") \ 3680 \ 3681 product(bool, ReflectionWrapResolutionErrors, true, \ 3682 "Temporary flag for transition to AbstractMethodError wrapped " \ 3683 "in InvocationTargetException. See 6531596") \ 3684 \ 3685 \ 3686 develop(intx, FastSuperclassLimit, 8, \ 3687 "Depth of hardwired instanceof accelerator array") \ 3688 \ 3689 /* Properties for Java libraries */ \ 3690 \ 3691 product(intx, MaxDirectMemorySize, -1, \ 3692 "Maximum total size of NIO direct-buffer allocations") \ 3693 \ 3694 /* temporary developer defined flags */ \ 3695 \ 3696 diagnostic(bool, UseNewCode, false, \ 3697 "Testing Only: Use the new version while testing") \ 3698 \ 3699 diagnostic(bool, UseNewCode2, false, \ 3700 "Testing Only: Use the new version while testing") \ 3701 \ 3702 diagnostic(bool, UseNewCode3, false, \ 3703 "Testing Only: Use the new version while testing") \ 3704 \ 3705 /* flags for performance data collection */ \ 3706 \ 3707 product(bool, UsePerfData, falseInEmbedded, \ 3708 "Flag to disable jvmstat instrumentation for performance testing" \ 3709 "and problem isolation purposes.") \ 3710 \ 3711 product(bool, PerfDataSaveToFile, false, \ 3712 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3713 \ 3714 product(ccstr, PerfDataSaveFile, NULL, \ 3715 "Save PerfData memory to the specified absolute pathname," \ 3716 "%p in the file name if present will be replaced by pid") \ 3717 \ 3718 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3719 "Data sampling interval in milliseconds") \ 3720 \ 3721 develop(bool, PerfTraceDataCreation, false, \ 3722 "Trace creation of Performance Data Entries") \ 3723 \ 3724 develop(bool, PerfTraceMemOps, false, \ 3725 "Trace PerfMemory create/attach/detach calls") \ 3726 \ 3727 product(bool, PerfDisableSharedMem, false, \ 3728 "Store performance data in standard memory") \ 3729 \ 3730 product(intx, PerfDataMemorySize, 32*K, \ 3731 "Size of performance data memory region. Will be rounded " \ 3732 "up to a multiple of the native os page size.") \ 3733 \ 3734 product(intx, PerfMaxStringConstLength, 1024, \ 3735 "Maximum PerfStringConstant string length before truncation") \ 3736 \ 3737 product(bool, PerfAllowAtExitRegistration, false, \ 3738 "Allow registration of atexit() methods") \ 3739 \ 3740 product(bool, PerfBypassFileSystemCheck, false, \ 3741 "Bypass Win32 file system criteria checks (Windows Only)") \ 3742 \ 3743 product(intx, UnguardOnExecutionViolation, 0, \ 3744 "Unguard page and retry on no-execute fault (Win32 only)" \ 3745 "0=off, 1=conservative, 2=aggressive") \ 3746 \ 3747 /* Serviceability Support */ \ 3748 \ 3749 product(bool, ManagementServer, false, \ 3750 "Create JMX Management Server") \ 3751 \ 3752 product(bool, DisableAttachMechanism, false, \ 3753 "Disable mechanism that allows tools to attach to this VM") \ 3754 \ 3755 product(bool, StartAttachListener, false, \ 3756 "Always start Attach Listener at VM startup") \ 3757 \ 3758 manageable(bool, PrintConcurrentLocks, false, \ 3759 "Print java.util.concurrent locks in thread dump") \ 3760 \ 3761 product(bool, TransmitErrorReport, false, \ 3762 "Enable error report transmission on erroneous termination") \ 3763 \ 3764 product(ccstr, ErrorReportServer, NULL, \ 3765 "Override built-in error report server address") \ 3766 \ 3767 /* Shared spaces */ \ 3768 \ 3769 product(bool, UseSharedSpaces, true, \ 3770 "Use shared spaces in the permanent generation") \ 3771 \ 3772 product(bool, RequireSharedSpaces, false, \ 3773 "Require shared spaces in the permanent generation") \ 3774 \ 3775 product(bool, DumpSharedSpaces, false, \ 3776 "Special mode: JVM reads a class list, loads classes, builds " \ 3777 "shared spaces, and dumps the shared spaces to a file to be " \ 3778 "used in future JVM runs.") \ 3779 \ 3780 product(bool, PrintSharedSpaces, false, \ 3781 "Print usage of shared spaces") \ 3782 \ 3783 product(uintx, SharedDummyBlockSize, 512*M, \ 3784 "Size of dummy block used to shift heap addresses (in bytes)") \ 3785 \ 3786 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(13*M), \ 3787 "Size of read-write space in permanent generation (in bytes)") \ 3788 \ 3789 product(uintx, SharedReadOnlySize, 10*M, \ 3790 "Size of read-only space in permanent generation (in bytes)") \ 3791 \ 3792 product(uintx, SharedMiscDataSize, NOT_LP64(4*M) LP64_ONLY(5*M), \ 3793 "Size of the shared data area adjacent to the heap (in bytes)") \ 3794 \ 3795 product(uintx, SharedMiscCodeSize, 4*M, \ 3796 "Size of the shared code area adjacent to the heap (in bytes)") \ 3797 \ 3798 diagnostic(bool, SharedOptimizeColdStart, true, \ 3799 "At dump time, order shared objects to achieve better " \ 3800 "cold startup time.") \ 3801 \ 3802 develop(intx, SharedOptimizeColdStartPolicy, 2, \ 3803 "Reordering policy for SharedOptimizeColdStart " \ 3804 "0=favor classload-time locality, 1=balanced, " \ 3805 "2=favor runtime locality") \ 3806 \ 3807 diagnostic(bool, SharedSkipVerify, false, \ 3808 "Skip assert() and verify() which page-in unwanted shared " \ 3809 "objects. ") \ 3810 \ 3811 diagnostic(bool, EnableInvokeDynamic, true, \ 3812 "support JSR 292 (method handles, invokedynamic, " \ 3813 "anonymous classes") \ 3814 \ 3815 product(bool, AnonymousClasses, false, \ 3816 "support sun.misc.Unsafe.defineAnonymousClass (deprecated)") \ 3817 \ 3818 experimental(bool, EnableMethodHandles, false, \ 3819 "support method handles (deprecated)") \ 3820 \ 3821 diagnostic(intx, MethodHandlePushLimit, 3, \ 3822 "number of additional stack slots a method handle may push") \ 3823 \ 3824 diagnostic(bool, PrintMethodHandleStubs, false, \ 3825 "Print generated stub code for method handles") \ 3826 \ 3827 develop(bool, TraceMethodHandles, false, \ 3828 "trace internal method handle operations") \ 3829 \ 3830 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3831 "perform extra checks when constructing method handles") \ 3832 \ 3833 diagnostic(bool, OptimizeMethodHandles, true, \ 3834 "when constructing method handles, try to improve them") \ 3835 \ 3836 develop(bool, StressMethodHandleWalk, false, \ 3837 "Process all method handles with MethodHandleWalk") \ 3838 \ 3839 experimental(bool, TrustFinalNonStaticFields, false, \ 3840 "trust final non-static declarations for constant folding") \ 3841 \ 3842 experimental(bool, AllowInvokeGeneric, false, \ 3843 "accept MethodHandle.invoke and MethodHandle.invokeGeneric " \ 3844 "as equivalent methods") \ 3845 \ 3846 develop(bool, TraceInvokeDynamic, false, \ 3847 "trace internal invoke dynamic operations") \ 3848 \ 3849 diagnostic(bool, PauseAtStartup, false, \ 3850 "Causes the VM to pause at startup time and wait for the pause " \ 3851 "file to be removed (default: ./vm.paused.<pid>)") \ 3852 \ 3853 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3854 "The file to create and for whose removal to await when pausing " \ 3855 "at startup. (default: ./vm.paused.<pid>)") \ 3856 \ 3857 diagnostic(bool, PauseAtExit, false, \ 3858 "Pause and wait for keypress on exit if a debugger is attached") \ 3859 \ 3860 product(bool, ExtendedDTraceProbes, false, \ 3861 "Enable performance-impacting dtrace probes") \ 3862 \ 3863 product(bool, DTraceMethodProbes, false, \ 3864 "Enable dtrace probes for method-entry and method-exit") \ 3865 \ 3866 product(bool, DTraceAllocProbes, false, \ 3867 "Enable dtrace probes for object allocation") \ 3868 \ 3869 product(bool, DTraceMonitorProbes, false, \ 3870 "Enable dtrace probes for monitor events") \ 3871 \ 3872 product(bool, RelaxAccessControlCheck, false, \ 3873 "Relax the access control checks in the verifier") \ 3874 \ 3875 diagnostic(bool, PrintDTraceDOF, false, \ 3876 "Print the DTrace DOF passed to the system for JSDT probes") \ 3877 \ 3878 product(uintx, StringTableSize, 1009, \ 3879 "Number of buckets in the interned String table") \ 3880 \ 3881 product(bool, UseVMInterruptibleIO, false, \ 3882 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3883 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3884 " of this flag is true for JDK 6 and earliers") 3885 3886/* 3887 * Macros for factoring of globals 3888 */ 3889 3890// Interface macros 3891#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3892#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3893#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3894#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3895#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3896#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3897#ifdef PRODUCT 3898#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3899#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3900#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3901#else 3902#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3903#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3904#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3905#endif 3906// Special LP64 flags, product only needed for now. 3907#ifdef _LP64 3908#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3909#else 3910#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3911#endif // _LP64 3912 3913// Implementation macros 3914#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3915#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3916#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3917#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3918#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3919#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3920#ifdef PRODUCT 3921#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3922#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3923#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3924#else 3925#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3926#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3927#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3928#endif 3929#ifdef _LP64 3930#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3931#else 3932#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3933#endif // _LP64 3934 3935RUNTIME_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) 3936 3937RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3938 3939// Extensions 3940 3941#include "runtime/globals_ext.hpp" 3942 3943#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3944