globals.hpp revision 4418:2e093b564241
1130389Sle/* 2190507Slulf * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. 3190507Slulf * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4130389Sle * 5130389Sle * This code is free software; you can redistribute it and/or modify it 6130389Sle * under the terms of the GNU General Public License version 2 only, as 7130389Sle * published by the Free Software Foundation. 8130389Sle * 9130389Sle * This code is distributed in the hope that it will be useful, but WITHOUT 10130389Sle * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11130389Sle * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12130389Sle * version 2 for more details (a copy is included in the LICENSE file that 13130389Sle * accompanied this code). 14130389Sle * 15130389Sle * You should have received a copy of the GNU General Public License version 16130389Sle * 2 along with this work; if not, write to the Free Software Foundation, 17130389Sle * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18130389Sle * 19130389Sle * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20130389Sle * or visit www.oracle.com if you need additional information or have any 21130389Sle * questions. 22130389Sle * 23130389Sle */ 24130389Sle 25130389Sle#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 26130389Sle#define SHARE_VM_RUNTIME_GLOBALS_HPP 27130389Sle 28130389Sle#include "utilities/debug.hpp" 29130389Sle 30130389Sle// use this for flags that are true per default in the tiered build 31130389Sle// but false in non-tiered builds, and vice versa 32130389Sle#ifdef TIERED 33130389Sle#define trueInTiered true 34130389Sle#define falseInTiered false 35130389Sle#else 36130389Sle#define trueInTiered false 37130389Sle#define falseInTiered true 38130389Sle#endif 39130389Sle 40130389Sle#ifdef TARGET_ARCH_x86 41130389Sle# include "globals_x86.hpp" 42130389Sle#endif 43130389Sle#ifdef TARGET_ARCH_sparc 44130389Sle# include "globals_sparc.hpp" 45130389Sle#endif 46130389Sle#ifdef TARGET_ARCH_zero 47223921Sae# include "globals_zero.hpp" 48130389Sle#endif 49130389Sle#ifdef TARGET_ARCH_arm 50130389Sle# include "globals_arm.hpp" 51130389Sle#endif 52130389Sle#ifdef TARGET_ARCH_ppc 53130389Sle# include "globals_ppc.hpp" 54130389Sle#endif 55190507Slulf#ifdef TARGET_OS_FAMILY_linux 56190507Slulf# include "globals_linux.hpp" 57168670Sle#endif 58130389Sle#ifdef TARGET_OS_FAMILY_solaris 59190507Slulf# include "globals_solaris.hpp" 60130389Sle#endif 61130389Sle#ifdef TARGET_OS_FAMILY_windows 62130389Sle# include "globals_windows.hpp" 63130389Sle#endif 64130389Sle#ifdef TARGET_OS_FAMILY_bsd 65190507Slulf# include "globals_bsd.hpp" 66130389Sle#endif 67130389Sle#ifdef TARGET_OS_ARCH_linux_x86 68190507Slulf# include "globals_linux_x86.hpp" 69130389Sle#endif 70130389Sle#ifdef TARGET_OS_ARCH_linux_sparc 71130389Sle# include "globals_linux_sparc.hpp" 72130389Sle#endif 73130389Sle#ifdef TARGET_OS_ARCH_linux_zero 74130389Sle# include "globals_linux_zero.hpp" 75130389Sle#endif 76130389Sle#ifdef TARGET_OS_ARCH_solaris_x86 77130389Sle# include "globals_solaris_x86.hpp" 78130389Sle#endif 79130389Sle#ifdef TARGET_OS_ARCH_solaris_sparc 80130389Sle# include "globals_solaris_sparc.hpp" 81130389Sle#endif 82130389Sle#ifdef TARGET_OS_ARCH_windows_x86 83190507Slulf# include "globals_windows_x86.hpp" 84190507Slulf#endif 85130389Sle#ifdef TARGET_OS_ARCH_linux_arm 86190507Slulf# include "globals_linux_arm.hpp" 87190507Slulf#endif 88190507Slulf#ifdef TARGET_OS_ARCH_linux_ppc 89190507Slulf# include "globals_linux_ppc.hpp" 90190507Slulf#endif 91190507Slulf#ifdef TARGET_OS_ARCH_bsd_x86 92190507Slulf# include "globals_bsd_x86.hpp" 93190507Slulf#endif 94190507Slulf#ifdef TARGET_OS_ARCH_bsd_zero 95190507Slulf# include "globals_bsd_zero.hpp" 96190507Slulf#endif 97190507Slulf#ifdef COMPILER1 98130389Sle#ifdef TARGET_ARCH_x86 99190507Slulf# include "c1_globals_x86.hpp" 100190507Slulf#endif 101190507Slulf#ifdef TARGET_ARCH_sparc 102130389Sle# include "c1_globals_sparc.hpp" 103190507Slulf#endif 104130389Sle#ifdef TARGET_ARCH_arm 105190507Slulf# include "c1_globals_arm.hpp" 106190507Slulf#endif 107190507Slulf#ifdef TARGET_ARCH_ppc 108190507Slulf# include "c1_globals_ppc.hpp" 109190507Slulf#endif 110190507Slulf#ifdef TARGET_OS_FAMILY_linux 111130389Sle# include "c1_globals_linux.hpp" 112190507Slulf#endif 113190507Slulf#ifdef TARGET_OS_FAMILY_solaris 114190507Slulf# include "c1_globals_solaris.hpp" 115190507Slulf#endif 116190507Slulf#ifdef TARGET_OS_FAMILY_windows 117190507Slulf# include "c1_globals_windows.hpp" 118130389Sle#endif 119190507Slulf#ifdef TARGET_OS_FAMILY_bsd 120190507Slulf# include "c1_globals_bsd.hpp" 121190507Slulf#endif 122130389Sle#endif 123190507Slulf#ifdef COMPILER2 124190507Slulf#ifdef TARGET_ARCH_x86 125190507Slulf# include "c2_globals_x86.hpp" 126190507Slulf#endif 127190507Slulf#ifdef TARGET_ARCH_sparc 128190507Slulf# include "c2_globals_sparc.hpp" 129190507Slulf#endif 130190507Slulf#ifdef TARGET_ARCH_arm 131130389Sle# include "c2_globals_arm.hpp" 132190507Slulf#endif 133190507Slulf#ifdef TARGET_OS_FAMILY_linux 134130389Sle# include "c2_globals_linux.hpp" 135190507Slulf#endif 136190507Slulf#ifdef TARGET_OS_FAMILY_solaris 137190507Slulf# include "c2_globals_solaris.hpp" 138190507Slulf#endif 139130389Sle#ifdef TARGET_OS_FAMILY_windows 140190507Slulf# include "c2_globals_windows.hpp" 141190507Slulf#endif 142190507Slulf#ifdef TARGET_OS_FAMILY_bsd 143190507Slulf# include "c2_globals_bsd.hpp" 144190507Slulf#endif 145190507Slulf#endif 146130389Sle#ifdef SHARK 147190507Slulf#ifdef TARGET_ARCH_zero 148190507Slulf# include "shark_globals_zero.hpp" 149190507Slulf#endif 150130389Sle#endif 151190507Slulf 152190507Slulf#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 153190507Slulfdefine_pd_global(bool, BackgroundCompilation, false); 154190507Slulfdefine_pd_global(bool, UseTLAB, false); 155190507Slulfdefine_pd_global(bool, CICompileOSR, false); 156190507Slulfdefine_pd_global(bool, UseTypeProfile, false); 157190507Slulfdefine_pd_global(bool, UseOnStackReplacement, false); 158190507Slulfdefine_pd_global(bool, InlineIntrinsics, false); 159190507Slulfdefine_pd_global(bool, PreferInterpreterNativeStubs, true); 160190507Slulfdefine_pd_global(bool, ProfileInterpreter, false); 161190507Slulfdefine_pd_global(bool, ProfileTraps, false); 162190507Slulfdefine_pd_global(bool, TieredCompilation, false); 163190507Slulf 164190507Slulfdefine_pd_global(intx, CompileThreshold, 0); 165190507Slulfdefine_pd_global(intx, BackEdgeThreshold, 0); 166190507Slulf 167190507Slulfdefine_pd_global(intx, OnStackReplacePercentage, 0); 168190507Slulfdefine_pd_global(bool, ResizeTLAB, false); 169190507Slulfdefine_pd_global(intx, FreqInlineSize, 0); 170190507Slulfdefine_pd_global(intx, InlineSmallCode, 0); 171130389Sledefine_pd_global(intx, NewSizeThreadIncrease, 4*K); 172130389Sledefine_pd_global(intx, InlineClassNatives, true); 173130389Sledefine_pd_global(intx, InlineUnsafeOps, true); 174130389Sledefine_pd_global(intx, InitialCodeCacheSize, 160*K); 175130389Sledefine_pd_global(intx, ReservedCodeCacheSize, 32*M); 176130389Sledefine_pd_global(intx, CodeCacheExpansionSize, 32*K); 177130389Sledefine_pd_global(intx, CodeCacheMinBlockLength, 1); 178130389Sledefine_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 179130389Sledefine_pd_global(bool, NeverActAsServerClassMachine, true); 180130389Sledefine_pd_global(uint64_t,MaxRAM, 1ULL*G); 181130389Sle#define CI_COMPILER_COUNT 0 182130389Sle#else 183130389Sle 184130389Sle#ifdef COMPILER2 185130389Sle#define CI_COMPILER_COUNT 2 186130389Sle#else 187130389Sle#define CI_COMPILER_COUNT 1 188130389Sle#endif // COMPILER2 189130389Sle 190130389Sle#endif // no compilers 191130389Sle 192130389Sle// string type aliases used only in this file 193136064Sletypedef const char* ccstr; 194130389Sletypedef const char* ccstrlist; // represents string arguments which accumulate 195130389Sle 196130389Sleenum FlagValueOrigin { 197130389Sle DEFAULT = 0, 198130389Sle COMMAND_LINE = 1, 199130389Sle ENVIRON_VAR = 2, 200130389Sle CONFIG_FILE = 3, 201130389Sle MANAGEMENT = 4, 202130389Sle ERGONOMIC = 5, 203130389Sle ATTACH_ON_DEMAND = 6, 204130389Sle INTERNAL = 99 205130389Sle}; 206130389Sle 207130389Slestruct Flag { 208130389Sle const char *type; 209130389Sle const char *name; 210130389Sle void* addr; 211130389Sle 212130389Sle NOT_PRODUCT(const char *doc;) 213130389Sle 214130389Sle const char *kind; 215130389Sle FlagValueOrigin origin; 216130389Sle 217130389Sle // points to all Flags static array 218130389Sle static Flag *flags; 219130389Sle 220130389Sle // number of flags 221130389Sle static size_t numFlags; 222130389Sle 223130389Sle static Flag* find_flag(char* name, size_t length, bool allow_locked = false); 224130389Sle 225130389Sle bool is_bool() const { return strcmp(type, "bool") == 0; } 226130389Sle bool get_bool() const { return *((bool*) addr); } 227130389Sle void set_bool(bool value) { *((bool*) addr) = value; } 228130389Sle 229130389Sle bool is_intx() const { return strcmp(type, "intx") == 0; } 230130389Sle intx get_intx() const { return *((intx*) addr); } 231130389Sle void set_intx(intx value) { *((intx*) addr) = value; } 232130389Sle 233130389Sle bool is_uintx() const { return strcmp(type, "uintx") == 0; } 234130389Sle uintx get_uintx() const { return *((uintx*) addr); } 235130389Sle void set_uintx(uintx value) { *((uintx*) addr) = value; } 236130389Sle 237168670Sle bool is_uint64_t() const { return strcmp(type, "uint64_t") == 0; } 238190507Slulf uint64_t get_uint64_t() const { return *((uint64_t*) addr); } 239168670Sle void set_uint64_t(uint64_t value) { *((uint64_t*) addr) = value; } 240168670Sle 241190507Slulf bool is_double() const { return strcmp(type, "double") == 0; } 242168670Sle double get_double() const { return *((double*) addr); } 243168670Sle void set_double(double value) { *((double*) addr) = value; } 244168670Sle 245190507Slulf bool is_ccstr() const { return strcmp(type, "ccstr") == 0 || strcmp(type, "ccstrlist") == 0; } 246190507Slulf bool ccstr_accumulates() const { return strcmp(type, "ccstrlist") == 0; } 247190507Slulf ccstr get_ccstr() const { return *((ccstr*) addr); } 248190507Slulf void set_ccstr(ccstr value) { *((ccstr*) addr) = value; } 249168670Sle 250168670Sle bool is_unlocker() const; 251168670Sle bool is_unlocked() const; 252168670Sle bool is_writeable() const; 253168670Sle bool is_external() const; 254168670Sle 255168670Sle bool is_unlocker_ext() const; 256190507Slulf bool is_unlocked_ext() const; 257130389Sle bool is_writeable_ext() const; 258190507Slulf bool is_external_ext() const; 259130389Sle 260190507Slulf void get_locked_message(char*, int) const; 261190507Slulf void get_locked_message_ext(char*, int) const; 262190507Slulf 263190507Slulf void print_on(outputStream* st, bool withComments = false ); 264190507Slulf void print_as_flag(outputStream* st); 265190507Slulf}; 266190507Slulf 267190507Slulf// debug flags control various aspects of the VM and are global accessible 268190507Slulf 269190507Slulf// use FlagSetting to temporarily change some debug flag 270190507Slulf// e.g. FlagSetting fs(DebugThisAndThat, true); 271190507Slulf// restored to previous value upon leaving scope 272190507Slulfclass FlagSetting { 273190507Slulf bool val; 274190507Slulf bool* flag; 275190507Slulf public: 276190507Slulf FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 277130389Sle ~FlagSetting() { *flag = val; } 278190507Slulf}; 279130389Sle 280130389Sle 281130389Sleclass CounterSetting { 282130389Sle intx* counter; 283130389Sle public: 284157292Sle CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 285157292Sle ~CounterSetting() { (*counter)--; } 286190507Slulf}; 287190507Slulf 288190507Slulf 289190507Slulfclass IntFlagSetting { 290190507Slulf intx val; 291190507Slulf intx* flag; 292190507Slulf public: 293190507Slulf IntFlagSetting(intx& fl, intx newValue) { flag = &fl; val = fl; fl = newValue; } 294190507Slulf ~IntFlagSetting() { *flag = val; } 295190507Slulf}; 296190507Slulf 297190507Slulf 298190507Slulfclass DoubleFlagSetting { 299190507Slulf double val; 300190507Slulf double* flag; 301190507Slulf public: 302190507Slulf DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 303190507Slulf ~DoubleFlagSetting() { *flag = val; } 304190507Slulf}; 305190507Slulf 306190507Slulf 307190507Slulfclass CommandLineFlags { 308190507Slulf public: 309190507Slulf static bool boolAt(char* name, size_t len, bool* value); 310190507Slulf static bool boolAt(char* name, bool* value) { return boolAt(name, strlen(name), value); } 311190507Slulf static bool boolAtPut(char* name, size_t len, bool* value, FlagValueOrigin origin); 312190507Slulf static bool boolAtPut(char* name, bool* value, FlagValueOrigin origin) { return boolAtPut(name, strlen(name), value, origin); } 313190507Slulf 314190507Slulf static bool intxAt(char* name, size_t len, intx* value); 315190507Slulf static bool intxAt(char* name, intx* value) { return intxAt(name, strlen(name), value); } 316190507Slulf static bool intxAtPut(char* name, size_t len, intx* value, FlagValueOrigin origin); 317190507Slulf static bool intxAtPut(char* name, intx* value, FlagValueOrigin origin) { return intxAtPut(name, strlen(name), value, origin); } 318190507Slulf 319190507Slulf static bool uintxAt(char* name, size_t len, uintx* value); 320190507Slulf static bool uintxAt(char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 321190507Slulf static bool uintxAtPut(char* name, size_t len, uintx* value, FlagValueOrigin origin); 322190507Slulf static bool uintxAtPut(char* name, uintx* value, FlagValueOrigin origin) { return uintxAtPut(name, strlen(name), value, origin); } 323190507Slulf 324190507Slulf static bool uint64_tAt(char* name, size_t len, uint64_t* value); 325190507Slulf static bool uint64_tAt(char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 326190507Slulf static bool uint64_tAtPut(char* name, size_t len, uint64_t* value, FlagValueOrigin origin); 327157292Sle static bool uint64_tAtPut(char* name, uint64_t* value, FlagValueOrigin origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 328157292Sle 329130389Sle static bool doubleAt(char* name, size_t len, double* value); 330130389Sle static bool doubleAt(char* name, double* value) { return doubleAt(name, strlen(name), value); } 331190507Slulf static bool doubleAtPut(char* name, size_t len, double* value, FlagValueOrigin origin); 332190507Slulf static bool doubleAtPut(char* name, double* value, FlagValueOrigin origin) { return doubleAtPut(name, strlen(name), value, origin); } 333190507Slulf 334190507Slulf static bool ccstrAt(char* name, size_t len, ccstr* value); 335190507Slulf static bool ccstrAt(char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 336130389Sle static bool ccstrAtPut(char* name, size_t len, ccstr* value, FlagValueOrigin origin); 337130389Sle static bool ccstrAtPut(char* name, ccstr* value, FlagValueOrigin origin) { return ccstrAtPut(name, strlen(name), value, origin); } 338130389Sle 339130389Sle // Returns false if name is not a command line flag. 340130389Sle static bool wasSetOnCmdline(const char* name, bool* value); 341130389Sle static void printSetFlags(outputStream* out); 342130389Sle 343130389Sle static void printFlags(outputStream* out, bool withComments); 344130389Sle 345190507Slulf static void verify() PRODUCT_RETURN; 346130389Sle}; 347130389Sle 348130389Sle// use this for flags that are true by default in the debug version but 349130389Sle// false in the optimized version, and vice versa 350130389Sle#ifdef ASSERT 351130389Sle#define trueInDebug true 352130389Sle#define falseInDebug false 353130389Sle#else 354130389Sle#define trueInDebug false 355130389Sle#define falseInDebug true 356130389Sle#endif 357130389Sle 358130389Sle// use this for flags that are true per default in the product build 359130389Sle// but false in development builds, and vice versa 360130389Sle#ifdef PRODUCT 361130389Sle#define trueInProduct true 362130389Sle#define falseInProduct false 363130389Sle#else 364130389Sle#define trueInProduct false 365130389Sle#define falseInProduct true 366190507Slulf#endif 367190507Slulf 368190507Slulf#ifdef JAVASE_EMBEDDED 369190507Slulf#define falseInEmbedded false 370190507Slulf#else 371190507Slulf#define falseInEmbedded true 372190507Slulf#endif 373190507Slulf 374190507Slulf// develop flags are settable / visible only during development and are constant in the PRODUCT version 375190507Slulf// product flags are always settable / visible 376190507Slulf// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 377190507Slulf 378190507Slulf// A flag must be declared with one of the following types: 379190507Slulf// bool, intx, uintx, ccstr. 380190507Slulf// The type "ccstr" is an alias for "const char*" and is used 381190507Slulf// only in this file, because the macrology requires single-token type names. 382190507Slulf 383190507Slulf// Note: Diagnostic options not meant for VM tuning or for product modes. 384191855Slulf// They are to be used for VM quality assurance or field diagnosis 385190507Slulf// of VM bugs. They are hidden so that users will not be encouraged to 386190507Slulf// try them as if they were VM ordinary execution options. However, they 387190507Slulf// are available in the product version of the VM. Under instruction 388190507Slulf// from support engineers, VM customers can turn them on to collect 389130389Sle// diagnostic information about VM problems. To use a VM diagnostic 390130389Sle// option, you must first specify +UnlockDiagnosticVMOptions. 391130389Sle// (This master switch also affects the behavior of -Xprintflags.) 392130389Sle// 393130389Sle// experimental flags are in support of features that are not 394132940Sle// part of the officially supported product, but are available 395132940Sle// for experimenting with. They could, for example, be performance 396132940Sle// features that may not have undergone full or rigorous QA, but which may 397132940Sle// help performance in some cases and released for experimentation 398190507Slulf// by the community of users and developers. This flag also allows one to 399190507Slulf// be able to build a fully supported product that nonetheless also 400190507Slulf// ships with some unsupported, lightly tested, experimental features. 401190507Slulf// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 402190507Slulf// UnlockExperimentalVMOptions flag, which allows the control and 403190507Slulf// modification of the experimental flags. 404190507Slulf// 405132940Sle// Nota bene: neither diagnostic nor experimental options should be used casually, 406190507Slulf// and they are not supported on production loads, except under explicit 407190507Slulf// direction from support engineers. 408190507Slulf// 409190507Slulf// manageable flags are writeable external product flags. 410190507Slulf// They are dynamically writeable through the JDK management interface 411190507Slulf// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 412132940Sle// These flags are external exported interface (see CCC). The list of 413190507Slulf// manageable flags can be queried programmatically through the management 414190507Slulf// interface. 415190507Slulf// 416190507Slulf// A flag can be made as "manageable" only if 417190507Slulf// - the flag is defined in a CCC as an external exported interface. 418190507Slulf// - the VM implementation supports dynamic setting of the flag. 419132940Sle// This implies that the VM must *always* query the flag variable 420132940Sle// and not reuse state related to the flag state at any given time. 421190507Slulf// - you want the flag to be queried programmatically by the customers. 422132940Sle// 423132940Sle// product_rw flags are writeable internal product flags. 424168670Sle// They are like "manageable" flags but for internal/private use. 425168670Sle// The list of product_rw flags are internal/private flags which 426168670Sle// may be changed/removed in a future release. It can be set 427168670Sle// through the management interface to get/set value 428168670Sle// when the name of flag is supplied. 429168670Sle// 430190507Slulf// A flag can be made as "product_rw" only if 431168670Sle// - the VM implementation supports dynamic setting of the flag. 432168670Sle// This implies that the VM must *always* query the flag variable 433168670Sle// and not reuse state related to the flag state at any given time. 434168670Sle// 435168670Sle// Note that when there is a need to support develop flags to be writeable, 436190507Slulf// it can be done in the same way as product_rw. 437168670Sle 438168670Sle#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 439168670Sle \ 440168670Sle lp64_product(bool, UseCompressedOops, false, \ 441168670Sle "Use 32-bit object references in 64-bit VM " \ 442168670Sle "lp64_product means flag is always constant in 32 bit VM") \ 443168670Sle \ 444190507Slulf lp64_product(bool, UseCompressedKlassPointers, false, \ 445168670Sle "Use 32-bit klass pointers in 64-bit VM " \ 446168670Sle "lp64_product means flag is always constant in 32 bit VM") \ 447168670Sle \ 448190507Slulf notproduct(bool, CheckCompressedOops, true, \ 449168670Sle "generate checks in encoding/decoding code in debug VM") \ 450168670Sle \ 451168670Sle product_pd(uintx, HeapBaseMinAddress, \ 452168670Sle "OS specific low limit for heap base address") \ 453168670Sle \ 454168670Sle diagnostic(bool, PrintCompressedOopsMode, false, \ 455168670Sle "Print compressed oops base address and encoding mode") \ 456168670Sle \ 457168670Sle lp64_product(intx, ObjectAlignmentInBytes, 8, \ 458168670Sle "Default object alignment in bytes, 8 is minimum") \ 459168670Sle \ 460168670Sle /* UseMembar is theoretically a temp flag used for memory barrier \ 461168670Sle * removal testing. It was supposed to be removed before FCS but has \ 462168670Sle * been re-added (see 6401008) */ \ 463168670Sle product_pd(bool, UseMembar, \ 464168670Sle "(Unstable) Issues membars on thread state transitions") \ 465168670Sle \ 466168670Sle /* Temp PPC Flag to allow disabling the use of lwsync on ppc platforms \ 467168670Sle * that don't support it. This will be replaced by processor detection \ 468168670Sle * logic. \ 469190507Slulf */ \ 470168670Sle product(bool, UsePPCLWSYNC, true, \ 471168670Sle "Use lwsync instruction if true, else use slower sync") \ 472168670Sle \ 473168670Sle develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 474168670Sle "Whether to clean the chunk pool asynchronously") \ 475168670Sle \ 476168670Sle /* Temporary: See 6948537 */ \ 477132940Sle experimental(bool, UseMemSetInBOT, true, \ 478130389Sle "(Unstable) uses memset in BOT updates in GC code") \ 479130389Sle \ 480130389Sle diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 481130389Sle "Enable normal processing of flags relating to field diagnostics")\ 482130389Sle \ 483130389Sle experimental(bool, UnlockExperimentalVMOptions, false, \ 484130389Sle "Enable normal processing of flags relating to experimental features")\ 485130389Sle \ 486130389Sle product(bool, JavaMonitorsInStackTrace, true, \ 487130389Sle "Print info. about Java monitor locks when the stacks are dumped")\ 488190507Slulf \ 489130389Sle product_pd(bool, UseLargePages, \ 490130389Sle "Use large page memory") \ 491130389Sle \ 492130389Sle product_pd(bool, UseLargePagesIndividualAllocation, \ 493130389Sle "Allocate large pages individually for better affinity") \ 494130389Sle \ 495130389Sle develop(bool, LargePagesIndividualAllocationInjectError, false, \ 496130389Sle "Fail large pages individual allocation") \ 497130389Sle \ 498130389Sle develop(bool, TracePageSizes, false, \ 499130389Sle "Trace page size selection and usage.") \ 500130389Sle \ 501130389Sle product(bool, UseNUMA, false, \ 502130389Sle "Use NUMA if available") \ 503130389Sle \ 504130389Sle product(bool, UseNUMAInterleaving, false, \ 505190507Slulf "Interleave memory across NUMA nodes if available") \ 506130389Sle \ 507130389Sle product(uintx, NUMAInterleaveGranularity, 2*M, \ 508130389Sle "Granularity to use for NUMA interleaving on Windows OS") \ 509130389Sle \ 510130389Sle product(bool, ForceNUMA, false, \ 511130389Sle "Force NUMA optimizations on single-node/UMA systems") \ 512130389Sle \ 513130389Sle product(intx, NUMAChunkResizeWeight, 20, \ 514184292Slulf "Percentage (0-100) used to weight the current sample when " \ 515184292Slulf "computing exponentially decaying average for " \ 516130389Sle "AdaptiveNUMAChunkSizing") \ 517190507Slulf \ 518190507Slulf product(intx, NUMASpaceResizeRate, 1*G, \ 519130389Sle "Do not reallocate more that this amount per collection") \ 520130389Sle \ 521130389Sle product(bool, UseAdaptiveNUMAChunkSizing, true, \ 522130389Sle "Enable adaptive chunk sizing for NUMA") \ 523190507Slulf \ 524130389Sle product(bool, NUMAStats, false, \ 525130389Sle "Print NUMA stats in detailed heap information") \ 526184292Slulf \ 527130389Sle product(intx, NUMAPageScanRate, 256, \ 528184292Slulf "Maximum number of pages to include in the page scan procedure") \ 529130389Sle \ 530130389Sle product_pd(bool, NeedsDeoptSuspend, \ 531130389Sle "True for register window machines (sparc/ia64)") \ 532130389Sle \ 533130389Sle product(intx, UseSSE, 99, \ 534190507Slulf "Highest supported SSE instructions set on x86/x64") \ 535130389Sle \ 536190507Slulf product(bool, UseAES, false, \ 537190507Slulf "Control whether AES instructions can be used on x86/x64") \ 538130389Sle \ 539190507Slulf product(uintx, LargePageSizeInBytes, 0, \ 540190507Slulf "Large page size (0 to let VM choose the page size") \ 541190507Slulf \ 542190507Slulf product(uintx, LargePageHeapSizeThreshold, 128*M, \ 543130389Sle "Use large pages if max heap is at least this big") \ 544190507Slulf \ 545190507Slulf product(bool, ForceTimeHighResolution, false, \ 546190507Slulf "Using high time resolution(For Win32 only)") \ 547190507Slulf \ 548190507Slulf develop(bool, TraceItables, false, \ 549190507Slulf "Trace initialization and use of itables") \ 550190507Slulf \ 551190507Slulf develop(bool, TracePcPatching, false, \ 552190507Slulf "Trace usage of frame::patch_pc") \ 553190507Slulf \ 554190507Slulf develop(bool, TraceJumps, false, \ 555190507Slulf "Trace assembly jumps in thread ring buffer") \ 556190507Slulf \ 557130389Sle develop(bool, TraceRelocator, false, \ 558190507Slulf "Trace the bytecode relocator") \ 559190507Slulf \ 560130389Sle develop(bool, TraceLongCompiles, false, \ 561130389Sle "Print out every time compilation is longer than " \ 562130389Sle "a given threashold") \ 563130389Sle \ 564130389Sle develop(bool, SafepointALot, false, \ 565130389Sle "Generates a lot of safepoints. Works with " \ 566130389Sle "GuaranteedSafepointInterval") \ 567190507Slulf \ 568130389Sle product_pd(bool, BackgroundCompilation, \ 569130389Sle "A thread requesting compilation is not blocked during " \ 570130389Sle "compilation") \ 571130389Sle \ 572130389Sle product(bool, PrintVMQWaitTime, false, \ 573130389Sle "Prints out the waiting time in VM operation queue") \ 574130389Sle \ 575130389Sle develop(bool, NoYieldsInMicrolock, false, \ 576190507Slulf "Disable yields in microlock") \ 577190507Slulf \ 578190507Slulf develop(bool, TraceOopMapGeneration, false, \ 579190507Slulf "Shows oopmap generation") \ 580190507Slulf \ 581130389Sle product(bool, MethodFlushing, true, \ 582130389Sle "Reclamation of zombie and not-entrant methods") \ 583190507Slulf \ 584190507Slulf develop(bool, VerifyStack, false, \ 585190507Slulf "Verify stack of each thread when it is entering a runtime call") \ 586190507Slulf \ 587190507Slulf diagnostic(bool, ForceUnreachable, false, \ 588190507Slulf "Make all non code cache addresses to be unreachable with forcing use of 64bit literal fixups") \ 589197767Slulf \ 590190507Slulf notproduct(bool, StressDerivedPointers, false, \ 591190507Slulf "Force scavenge when a derived pointers is detected on stack " \ 592190507Slulf "after rtm call") \ 593190507Slulf \ 594190507Slulf develop(bool, TraceDerivedPointers, false, \ 595130389Sle "Trace traversal of derived pointers on stack") \ 596130389Sle \ 597190507Slulf notproduct(bool, TraceCodeBlobStacks, false, \ 598190507Slulf "Trace stack-walk of codeblobs") \ 599190507Slulf \ 600190507Slulf product(bool, PrintJNIResolving, false, \ 601130389Sle "Used to implement -v:jni") \ 602130389Sle \ 603190507Slulf notproduct(bool, PrintRewrites, false, \ 604130389Sle "Print methods that are being rewritten") \ 605130389Sle \ 606130389Sle product(bool, UseInlineCaches, true, \ 607190507Slulf "Use Inline Caches for virtual calls ") \ 608190507Slulf \ 609190507Slulf develop(bool, InlineArrayCopy, true, \ 610190507Slulf "inline arraycopy native that is known to be part of " \ 611190507Slulf "base library DLL") \ 612130389Sle \ 613130389Sle develop(bool, InlineObjectHash, true, \ 614130389Sle "inline Object::hashCode() native that is known to be part " \ 615130389Sle "of base library DLL") \ 616197767Slulf \ 617190507Slulf develop(bool, InlineNatives, true, \ 618190507Slulf "inline natives that are known to be part of base library DLL") \ 619130389Sle \ 620130389Sle develop(bool, InlineMathNatives, true, \ 621130389Sle "inline SinD, CosD, etc.") \ 622190507Slulf \ 623190507Slulf develop(bool, InlineClassNatives, true, \ 624130389Sle "inline Class.isInstance, etc") \ 625130389Sle \ 626130389Sle develop(bool, InlineThreadNatives, true, \ 627130389Sle "inline Thread.currentThread, etc") \ 628190507Slulf \ 629190507Slulf develop(bool, InlineUnsafeOps, true, \ 630190507Slulf "inline memory ops (native methods) from sun.misc.Unsafe") \ 631190507Slulf \ 632190507Slulf product(bool, CriticalJNINatives, true, \ 633190507Slulf "check for critical JNI entry points") \ 634190507Slulf \ 635190507Slulf notproduct(bool, StressCriticalJNINatives, false, \ 636130389Sle "Exercise register saving code in critical natives") \ 637130389Sle \ 638130389Sle product(bool, UseSSE42Intrinsics, false, \ 639130389Sle "SSE4.2 versions of intrinsics") \ 640190507Slulf \ 641190507Slulf product(bool, UseAESIntrinsics, false, \ 642190507Slulf "use intrinsics for AES versions of crypto") \ 643130389Sle \ 644130389Sle develop(bool, TraceCallFixup, false, \ 645130389Sle "traces all call fixups") \ 646130389Sle \ 647130389Sle develop(bool, DeoptimizeALot, false, \ 648130389Sle "deoptimize at every exit from the runtime system") \ 649130389Sle \ 650130389Sle notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 651130389Sle "a comma separated list of bcis to deoptimize at") \ 652130389Sle \ 653130389Sle product(bool, DeoptimizeRandom, false, \ 654130389Sle "deoptimize random frames on random exit from the runtime system")\ 655130389Sle \ 656130389Sle notproduct(bool, ZombieALot, false, \ 657130389Sle "creates zombies (non-entrant) at exit from the runt. system") \ 658130542Sle \ 659130389Sle product(bool, UnlinkSymbolsALot, false, \ 660130389Sle "unlink unreferenced symbols from the symbol table at safepoints")\ 661130389Sle \ 662130389Sle notproduct(bool, WalkStackALot, false, \ 663130389Sle "trace stack (no print) at every exit from the runtime system") \ 664130389Sle \ 665130389Sle product(bool, Debugging, false, \ 666130389Sle "set when executing debug methods in debug.ccp " \ 667130389Sle "(to prevent triggering assertions)") \ 668130389Sle \ 669130389Sle notproduct(bool, StrictSafepointChecks, trueInDebug, \ 670130389Sle "Enable strict checks that safepoints cannot happen for threads " \ 671130389Sle "that used No_Safepoint_Verifier") \ 672130389Sle \ 673130389Sle notproduct(bool, VerifyLastFrame, false, \ 674130389Sle "Verify oops on last frame on entry to VM") \ 675130389Sle \ 676130389Sle develop(bool, TraceHandleAllocation, false, \ 677190507Slulf "Prints out warnings when suspicious many handles are allocated") \ 678190507Slulf \ 679190507Slulf product(bool, UseCompilerSafepoints, true, \ 680130389Sle "Stop at safepoints in compiled code") \ 681130389Sle \ 682130389Sle product(bool, UseSplitVerifier, true, \ 683130389Sle "use split verifier with StackMapTable attributes") \ 684130389Sle \ 685130389Sle product(bool, FailOverToOldVerifier, true, \ 686130389Sle "fail over to old verifier when split verifier fails") \ 687130389Sle \ 688130389Sle develop(bool, ShowSafepointMsgs, false, \ 689130389Sle "Show msg. about safepoint synch.") \ 690190507Slulf \ 691190507Slulf product(bool, SafepointTimeout, false, \ 692190507Slulf "Time out and warn or fail after SafepointTimeoutDelay " \ 693130389Sle "milliseconds if failed to reach safepoint") \ 694190507Slulf \ 695190507Slulf develop(bool, DieOnSafepointTimeout, false, \ 696190507Slulf "Die upon failure to reach safepoint (see SafepointTimeout)") \ 697190507Slulf \ 698130389Sle /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 699190507Slulf /* typically, at most a few retries are needed */ \ 700190507Slulf product(intx, SuspendRetryCount, 50, \ 701190507Slulf "Maximum retry count for an external suspend request") \ 702190507Slulf \ 703190507Slulf product(intx, SuspendRetryDelay, 5, \ 704190507Slulf "Milliseconds to delay per retry (* current_retry_count)") \ 705190507Slulf \ 706190507Slulf product(bool, AssertOnSuspendWaitFailure, false, \ 707190507Slulf "Assert/Guarantee on external suspend wait failure") \ 708190507Slulf \ 709190507Slulf product(bool, TraceSuspendWaitFailures, false, \ 710190507Slulf "Trace external suspend wait failures") \ 711190507Slulf \ 712130389Sle product(bool, MaxFDLimit, true, \ 713190507Slulf "Bump the number of file descriptors to max in solaris.") \ 714190507Slulf \ 715130389Sle diagnostic(bool, LogEvents, true, \ 716190507Slulf "Enable the various ring buffer event logs") \ 717190507Slulf \ 718190507Slulf diagnostic(intx, LogEventsBufferEntries, 10, \ 719190507Slulf "Enable the various ring buffer event logs") \ 720190507Slulf \ 721190507Slulf product(bool, BytecodeVerificationRemote, true, \ 722130389Sle "Enables the Java bytecode verifier for remote classes") \ 723130389Sle \ 724190507Slulf product(bool, BytecodeVerificationLocal, false, \ 725130389Sle "Enables the Java bytecode verifier for local classes") \ 726130389Sle \ 727130389Sle develop(bool, ForceFloatExceptions, trueInDebug, \ 728130389Sle "Force exceptions on FP stack under/overflow") \ 729130389Sle \ 730130389Sle develop(bool, VerifyStackAtCalls, false, \ 731130389Sle "Verify that the stack pointer is unchanged after calls") \ 732130389Sle \ 733130389Sle develop(bool, TraceJavaAssertions, false, \ 734130389Sle "Trace java language assertions") \ 735130389Sle \ 736130389Sle notproduct(bool, CheckAssertionStatusDirectives, false, \ 737130389Sle "temporary - see javaClasses.cpp") \ 738130389Sle \ 739130389Sle notproduct(bool, PrintMallocFree, false, \ 740130389Sle "Trace calls to C heap malloc/free allocation") \ 741130389Sle \ 742130389Sle product(bool, PrintOopAddress, false, \ 743130389Sle "Always print the location of the oop") \ 744130389Sle \ 745130389Sle notproduct(bool, VerifyCodeCacheOften, false, \ 746130389Sle "Verify compiled-code cache often") \ 747130389Sle \ 748130389Sle develop(bool, ZapDeadCompiledLocals, false, \ 749130389Sle "Zap dead locals in compiler frames") \ 750190507Slulf \ 751190507Slulf notproduct(bool, ZapDeadLocalsOld, false, \ 752130389Sle "Zap dead locals (old version, zaps all frames when " \ 753130389Sle "entering the VM") \ 754130389Sle \ 755130389Sle notproduct(bool, CheckOopishValues, false, \ 756130389Sle "Warn if value contains oop ( requires ZapDeadLocals)") \ 757130389Sle \ 758130389Sle develop(bool, UseMallocOnly, false, \ 759157292Sle "use only malloc/free for allocation (no resource area/arena)") \ 760157292Sle \ 761157292Sle develop(bool, PrintMalloc, false, \ 762157292Sle "print all malloc/free calls") \ 763157292Sle \ 764157292Sle develop(bool, PrintMallocStatistics, false, \ 765157292Sle "print malloc/free statistics") \ 766157292Sle \ 767157292Sle develop(bool, ZapResourceArea, trueInDebug, \ 768157292Sle "Zap freed resource/arena space with 0xABABABAB") \ 769157292Sle \ 770157292Sle notproduct(bool, ZapVMHandleArea, trueInDebug, \ 771157292Sle "Zap freed VM handle space with 0xBCBCBCBC") \ 772157292Sle \ 773157292Sle develop(bool, ZapJNIHandleArea, trueInDebug, \ 774157292Sle "Zap freed JNI handle space with 0xFEFEFEFE") \ 775157292Sle \ 776157292Sle notproduct(bool, ZapStackSegments, trueInDebug, \ 777157292Sle "Zap allocated/freed Stack segments with 0xFADFADED") \ 778157292Sle \ 779157292Sle develop(bool, ZapUnusedHeapArea, trueInDebug, \ 780157292Sle "Zap unused heap space with 0xBAADBABE") \ 781157292Sle \ 782157292Sle develop(bool, TraceZapUnusedHeapArea, false, \ 783157292Sle "Trace zapping of unused heap space") \ 784157292Sle \ 785157292Sle develop(bool, CheckZapUnusedHeapArea, false, \ 786157292Sle "Check zapping of unused heap space") \ 787157292Sle \ 788157292Sle develop(bool, ZapFillerObjects, trueInDebug, \ 789157292Sle "Zap filler objects with 0xDEAFBABE") \ 790157292Sle \ 791157292Sle develop(bool, PrintVMMessages, true, \ 792157292Sle "Print vm messages on console") \ 793157292Sle \ 794157292Sle product(bool, PrintGCApplicationConcurrentTime, false, \ 795157292Sle "Print the time the application has been running") \ 796157292Sle \ 797157292Sle product(bool, PrintGCApplicationStoppedTime, false, \ 798157292Sle "Print the time the application has been stopped") \ 799157292Sle \ 800157292Sle diagnostic(bool, VerboseVerification, false, \ 801157292Sle "Display detailed verification details") \ 802157292Sle \ 803157292Sle notproduct(uintx, ErrorHandlerTest, 0, \ 804157292Sle "If > 0, provokes an error after VM initialization; the value" \ 805157292Sle "determines which error to provoke. See test_error_handler()" \ 806157292Sle "in debug.cpp.") \ 807157292Sle \ 808157292Sle develop(bool, Verbose, false, \ 809157292Sle "Prints additional debugging information from other modes") \ 810157292Sle \ 811157292Sle develop(bool, PrintMiscellaneous, false, \ 812157292Sle "Prints uncategorized debugging information (requires +Verbose)") \ 813168670Sle \ 814157292Sle develop(bool, WizardMode, false, \ 815157292Sle "Prints much more debugging information") \ 816157292Sle \ 817130389Sle product(bool, ShowMessageBoxOnError, false, \ 818130389Sle "Keep process alive on VM fatal error") \ 819130389Sle \ 820130389Sle product(bool, CreateMinidumpOnCrash, false, \ 821130389Sle "Create minidump on VM fatal error") \ 822130389Sle \ 823130389Sle product_pd(bool, UseOSErrorReporting, \ 824130389Sle "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 825130389Sle \ 826130389Sle product(bool, SuppressFatalErrorMessage, false, \ 827130389Sle "Do NO Fatal Error report [Avoid deadlock]") \ 828130389Sle \ 829130389Sle product(ccstrlist, OnError, "", \ 830130389Sle "Run user-defined commands on fatal error; see VMError.cpp " \ 831130389Sle "for examples") \ 832130389Sle \ 833130389Sle product(ccstrlist, OnOutOfMemoryError, "", \ 834130389Sle "Run user-defined commands on first java.lang.OutOfMemoryError") \ 835130389Sle \ 836130389Sle manageable(bool, HeapDumpBeforeFullGC, false, \ 837130389Sle "Dump heap to file before any major stop-world GC") \ 838130389Sle \ 839130389Sle manageable(bool, HeapDumpAfterFullGC, false, \ 840130389Sle "Dump heap to file after any major stop-world GC") \ 841130389Sle \ 842130389Sle manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 843130389Sle "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 844130389Sle \ 845130389Sle manageable(ccstr, HeapDumpPath, NULL, \ 846130389Sle "When HeapDumpOnOutOfMemoryError is on, the path (filename or" \ 847130389Sle "directory) of the dump file (defaults to java_pid<pid>.hprof" \ 848130389Sle "in the working directory)") \ 849130389Sle \ 850130389Sle develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 851130389Sle "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 852130389Sle "when the heap usage is larger than this") \ 853130389Sle \ 854130389Sle develop(uintx, HeapDumpSegmentSize, 1*G, \ 855130389Sle "Approximate segment size when generating a segmented heap dump") \ 856130389Sle \ 857130389Sle develop(bool, BreakAtWarning, false, \ 858130389Sle "Execute breakpoint upon encountering VM warning") \ 859130389Sle \ 860130389Sle develop(bool, TraceVMOperation, false, \ 861130389Sle "Trace vm operations") \ 862130389Sle \ 863130389Sle develop(bool, UseFakeTimers, false, \ 864130389Sle "Tells whether the VM should use system time or a fake timer") \ 865130389Sle \ 866130389Sle product(ccstr, NativeMemoryTracking, "off", \ 867130389Sle "Native memory tracking options") \ 868130389Sle \ 869130389Sle diagnostic(bool, PrintNMTStatistics, false, \ 870130389Sle "Print native memory tracking summary data if it is on") \ 871130389Sle \ 872130389Sle diagnostic(bool, LogCompilation, false, \ 873130389Sle "Log compilation activity in detail to hotspot.log or LogFile") \ 874130389Sle \ 875130389Sle product(bool, PrintCompilation, false, \ 876130389Sle "Print compilations") \ 877130389Sle \ 878130389Sle diagnostic(bool, TraceNMethodInstalls, false, \ 879130389Sle "Trace nmethod intallation") \ 880130389Sle \ 881130389Sle diagnostic(intx, ScavengeRootsInCode, 2, \ 882130389Sle "0: do not allow scavengable oops in the code cache; " \ 883130389Sle "1: allow scavenging from the code cache; " \ 884130389Sle "2: emit as many constants as the compiler can see") \ 885130389Sle \ 886130389Sle product(bool, AlwaysRestoreFPU, false, \ 887130389Sle "Restore the FPU control word after every JNI call (expensive)") \ 888130389Sle \ 889130389Sle diagnostic(bool, PrintCompilation2, false, \ 890130389Sle "Print additional statistics per compilation") \ 891130389Sle \ 892130389Sle diagnostic(bool, PrintAdapterHandlers, false, \ 893130389Sle "Print code generated for i2c/c2i adapters") \ 894130389Sle \ 895130389Sle diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 896130389Sle "Verify that i2c/c2i adapters are called properly") \ 897130389Sle \ 898130389Sle develop(bool, VerifyAdapterSharing, false, \ 899130389Sle "Verify that the code for shared adapters is the equivalent") \ 900130389Sle \ 901130389Sle diagnostic(bool, PrintAssembly, false, \ 902130389Sle "Print assembly code (using external disassembler.so)") \ 903130389Sle \ 904130389Sle diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 905130389Sle "Options string passed to disassembler.so") \ 906130389Sle \ 907130389Sle diagnostic(bool, PrintNMethods, false, \ 908130389Sle "Print assembly code for nmethods when generated") \ 909130389Sle \ 910130389Sle diagnostic(bool, PrintNativeNMethods, false, \ 911130389Sle "Print assembly code for native nmethods when generated") \ 912130389Sle \ 913130389Sle develop(bool, PrintDebugInfo, false, \ 914130389Sle "Print debug information for all nmethods when generated") \ 915130389Sle \ 916130389Sle develop(bool, PrintRelocations, false, \ 917130389Sle "Print relocation information for all nmethods when generated") \ 918130389Sle \ 919130389Sle develop(bool, PrintDependencies, false, \ 920130389Sle "Print dependency information for all nmethods when generated") \ 921130389Sle \ 922130389Sle develop(bool, PrintExceptionHandlers, false, \ 923130389Sle "Print exception handler tables for all nmethods when generated") \ 924130389Sle \ 925130389Sle develop(bool, StressCompiledExceptionHandlers, false, \ 926130389Sle "Exercise compiled exception handlers") \ 927130389Sle \ 928130389Sle develop(bool, InterceptOSException, false, \ 929130389Sle "Starts debugger when an implicit OS (e.g., NULL) " \ 930130389Sle "exception happens") \ 931130389Sle \ 932130389Sle product(bool, PrintCodeCache, false, \ 933130389Sle "Print the code cache memory usage when exiting") \ 934130389Sle \ 935130389Sle develop(bool, PrintCodeCache2, false, \ 936190507Slulf "Print detailed usage info on the code cache when exiting") \ 937190507Slulf \ 938190507Slulf product(bool, PrintCodeCacheOnCompilation, false, \ 939190507Slulf "Print the code cache memory usage each time a method is compiled") \ 940190507Slulf \ 941190507Slulf diagnostic(bool, PrintStubCode, false, \ 942190507Slulf "Print generated stub code") \ 943190507Slulf \ 944190507Slulf product(bool, StackTraceInThrowable, true, \ 945190507Slulf "Collect backtrace in throwable when exception happens") \ 946190507Slulf \ 947190507Slulf product(bool, OmitStackTraceInFastThrow, true, \ 948190507Slulf "Omit backtraces for some 'hot' exceptions in optimized code") \ 949190507Slulf \ 950130389Sle product(bool, ProfilerPrintByteCodeStatistics, false, \ 951130389Sle "Prints byte code statictics when dumping profiler output") \ 952190507Slulf \ 953130389Sle product(bool, ProfilerRecordPC, false, \ 954190507Slulf "Collects tick for each 16 byte interval of compiled code") \ 955190507Slulf \ 956130389Sle product(bool, ProfileVM, false, \ 957190507Slulf "Profiles ticks that fall within VM (either in the VM Thread " \ 958190507Slulf "or VM code called through stubs)") \ 959190507Slulf \ 960190507Slulf product(bool, ProfileIntervals, false, \ 961190507Slulf "Prints profiles for each interval (see ProfileIntervalsTicks)") \ 962190507Slulf \ 963190507Slulf notproduct(bool, ProfilerCheckIntervals, false, \ 964190507Slulf "Collect and print info on spacing of profiler ticks") \ 965190507Slulf \ 966190507Slulf develop(bool, PrintJVMWarnings, false, \ 967130597Sle "Prints warnings for unimplemented JVM functions") \ 968130389Sle \ 969190507Slulf product(bool, PrintWarnings, true, \ 970190507Slulf "Prints JVM warnings to output stream") \ 971190507Slulf \ 972190507Slulf notproduct(uintx, WarnOnStalledSpinLock, 0, \ 973190507Slulf "Prints warnings for stalled SpinLocks") \ 974190507Slulf \ 975190507Slulf product(bool, RegisterFinalizersAtInit, true, \ 976190507Slulf "Register finalizable objects at end of Object.<init> or " \ 977190507Slulf "after allocation") \ 978190507Slulf \ 979190507Slulf develop(bool, RegisterReferences, true, \ 980190507Slulf "Tells whether the VM should register soft/weak/final/phantom " \ 981190507Slulf "references") \ 982190507Slulf \ 983190507Slulf develop(bool, IgnoreRewrites, false, \ 984190507Slulf "Supress rewrites of bytecodes in the oopmap generator. " \ 985190507Slulf "This is unsafe!") \ 986190507Slulf \ 987190507Slulf develop(bool, PrintCodeCacheExtension, false, \ 988190507Slulf "Print extension of code cache") \ 989190507Slulf \ 990190507Slulf develop(bool, UsePrivilegedStack, true, \ 991190507Slulf "Enable the security JVM functions") \ 992190507Slulf \ 993190507Slulf develop(bool, ProtectionDomainVerification, true, \ 994190507Slulf "Verifies protection domain before resolution in system " \ 995130389Sle "dictionary") \ 996130389Sle \ 997130389Sle product(bool, ClassUnloading, true, \ 998130389Sle "Do unloading of classes") \ 999130389Sle \ 1000130389Sle develop(bool, DisableStartThread, false, \ 1001130389Sle "Disable starting of additional Java threads " \ 1002130389Sle "(for debugging only)") \ 1003130389Sle \ 1004130389Sle develop(bool, MemProfiling, false, \ 1005130389Sle "Write memory usage profiling to log file") \ 1006130389Sle \ 1007130389Sle notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1008130389Sle "Prints the system dictionary at exit") \ 1009130389Sle \ 1010130389Sle experimental(intx, PredictedLoadedClassCount, 0, \ 1011130389Sle "Experimental: Tune loaded class cache starting size.") \ 1012130389Sle \ 1013130389Sle diagnostic(bool, UnsyncloadClass, false, \ 1014130389Sle "Unstable: VM calls loadClass unsynchronized. Custom " \ 1015130389Sle "class loader must call VM synchronized for findClass " \ 1016130389Sle "and defineClass.") \ 1017130389Sle \ 1018130389Sle product(bool, AlwaysLockClassLoader, false, \ 1019130389Sle "Require the VM to acquire the class loader lock before calling " \ 1020130389Sle "loadClass() even for class loaders registering " \ 1021130389Sle "as parallel capable") \ 1022130389Sle \ 1023130389Sle product(bool, AllowParallelDefineClass, false, \ 1024130389Sle "Allow parallel defineClass requests for class loaders " \ 1025130389Sle "registering as parallel capable") \ 1026130389Sle \ 1027130389Sle product(bool, MustCallLoadClassInternal, false, \ 1028130389Sle "Call loadClassInternal() rather than loadClass()") \ 1029130389Sle \ 1030190507Slulf product_pd(bool, DontYieldALot, \ 1031130389Sle "Throw away obvious excess yield calls (for SOLARIS only)") \ 1032130389Sle \ 1033130389Sle product_pd(bool, ConvertSleepToYield, \ 1034190507Slulf "Converts sleep(0) to thread yield " \ 1035135173Sle "(may be off for SOLARIS to improve GUI)") \ 1036190507Slulf \ 1037190507Slulf product(bool, ConvertYieldToSleep, false, \ 1038190507Slulf "Converts yield to a sleep of MinSleepInterval to simulate Win32 "\ 1039190507Slulf "behavior (SOLARIS only)") \ 1040190507Slulf \ 1041190507Slulf product(bool, UseBoundThreads, true, \ 1042190507Slulf "Bind user level threads to kernel threads (for SOLARIS only)") \ 1043190507Slulf \ 1044190507Slulf develop(bool, UseDetachedThreads, true, \ 1045190507Slulf "Use detached threads that are recycled upon termination " \ 1046190507Slulf "(for SOLARIS only)") \ 1047190507Slulf \ 1048190507Slulf product(bool, UseLWPSynchronization, true, \ 1049190507Slulf "Use LWP-based instead of libthread-based synchronization " \ 1050135173Sle "(SPARC only)") \ 1051190507Slulf \ 1052190507Slulf product(ccstr, SyncKnobs, NULL, \ 1053190507Slulf "(Unstable) Various monitor synchronization tunables") \ 1054190507Slulf \ 1055190507Slulf product(intx, EmitSync, 0, \ 1056190507Slulf "(Unsafe,Unstable) " \ 1057190507Slulf " Controls emission of inline sync fast-path code") \ 1058190507Slulf \ 1059190507Slulf product(intx, MonitorBound, 0, "Bound Monitor population") \ 1060190507Slulf \ 1061190507Slulf product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1062190507Slulf \ 1063190507Slulf product(intx, SyncFlags, 0, "(Unsafe,Unstable) Experimental Sync flags" ) \ 1064190507Slulf \ 1065190507Slulf product(intx, SyncVerbose, 0, "(Unstable)" ) \ 1066190507Slulf \ 1067190507Slulf product(intx, ClearFPUAtPark, 0, "(Unsafe,Unstable)" ) \ 1068190507Slulf \ 1069190507Slulf product(intx, hashCode, 5, \ 1070190507Slulf "(Unstable) select hashCode generation algorithm" ) \ 1071190507Slulf \ 1072190507Slulf product(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1073190507Slulf "(Unstable, Linux-specific)" \ 1074190507Slulf " avoid NPTL-FUTEX hang pthread_cond_timedwait" ) \ 1075190507Slulf \ 1076190507Slulf product(bool, FilterSpuriousWakeups, true, \ 1077190507Slulf "Prevent spurious or premature wakeups from object.wait " \ 1078190507Slulf "(Solaris only)") \ 1079190507Slulf \ 1080190507Slulf product(intx, NativeMonitorTimeout, -1, "(Unstable)" ) \ 1081190507Slulf product(intx, NativeMonitorFlags, 0, "(Unstable)" ) \ 1082135173Sle product(intx, NativeMonitorSpinLimit, 20, "(Unstable)" ) \ 1083135173Sle \ 1084135173Sle develop(bool, UsePthreads, false, \ 1085190507Slulf "Use pthread-based instead of libthread-based synchronization " \ 1086130389Sle "(SPARC only)") \ 1087190507Slulf \ 1088190507Slulf product(bool, AdjustConcurrency, false, \ 1089190507Slulf "call thr_setconcurrency at thread create time to avoid " \ 1090190507Slulf "LWP starvation on MP systems (For Solaris Only)") \ 1091190507Slulf \ 1092190507Slulf product(bool, ReduceSignalUsage, false, \ 1093190507Slulf "Reduce the use of OS signals in Java and/or the VM") \ 1094190507Slulf \ 1095190507Slulf develop_pd(bool, ShareVtableStubs, \ 1096190507Slulf "Share vtable stubs (smaller code but worse branch prediction") \ 1097190507Slulf \ 1098190507Slulf develop(bool, LoadLineNumberTables, true, \ 1099190507Slulf "Tells whether the class file parser loads line number tables") \ 1100190507Slulf \ 1101154075Sle develop(bool, LoadLocalVariableTables, true, \ 1102190507Slulf "Tells whether the class file parser loads local variable tables")\ 1103154075Sle \ 1104190507Slulf develop(bool, LoadLocalVariableTypeTables, true, \ 1105130389Sle "Tells whether the class file parser loads local variable type tables")\ 1106190507Slulf \ 1107190507Slulf product(bool, AllowUserSignalHandlers, false, \ 1108190507Slulf "Do not complain if the application installs signal handlers " \ 1109190507Slulf "(Solaris & Linux only)") \ 1110190507Slulf \ 1111190507Slulf product(bool, UseSignalChaining, true, \ 1112190507Slulf "Use signal-chaining to invoke signal handlers installed " \ 1113190507Slulf "by the application (Solaris & Linux only)") \ 1114190507Slulf \ 1115190507Slulf product(bool, UseAltSigs, false, \ 1116190507Slulf "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1117190507Slulf "internal signals (Solaris only)") \ 1118190507Slulf \ 1119190507Slulf product(bool, AllowJNIEnvProxy, false, \ 1120130389Sle "Allow JNIEnv proxies for jdbx") \ 1121135426Sle \ 1122190507Slulf product(bool, JNIDetachReleasesMonitors, true, \ 1123190507Slulf "JNI DetachCurrentThread releases monitors owned by thread") \ 1124190507Slulf \ 1125135426Sle product(bool, RestoreMXCSROnJNICalls, false, \ 1126190507Slulf "Restore MXCSR when returning from JNI calls") \ 1127190507Slulf \ 1128190507Slulf product(bool, CheckJNICalls, false, \ 1129190507Slulf "Verify all arguments to JNI calls") \ 1130190507Slulf \ 1131190507Slulf product(bool, UseFastJNIAccessors, true, \ 1132190507Slulf "Use optimized versions of Get<Primitive>Field") \ 1133190507Slulf \ 1134190507Slulf product(bool, EagerXrunInit, false, \ 1135190507Slulf "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1136190507Slulf " but not all -Xrun libraries may support the state of the VM at this time") \ 1137190507Slulf \ 1138135426Sle product(bool, PreserveAllAnnotations, false, \ 1139190507Slulf "Preserve RuntimeInvisibleAnnotations as well as RuntimeVisibleAnnotations") \ 1140190507Slulf \ 1141190507Slulf develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1142190507Slulf "Number of OutOfMemoryErrors preallocated with backtrace") \ 1143190507Slulf \ 1144190507Slulf product(bool, LazyBootClassLoader, true, \ 1145190507Slulf "Enable/disable lazy opening of boot class path entries") \ 1146190507Slulf \ 1147190507Slulf product(bool, UseXMMForArrayCopy, false, \ 1148190507Slulf "Use SSE2 MOVQ instruction for Arraycopy") \ 1149190507Slulf \ 1150190507Slulf product(intx, FieldsAllocationStyle, 1, \ 1151190507Slulf "0 - type based with oops first, 1 - with oops last, " \ 1152190507Slulf "2 - oops in super and sub classes are together") \ 1153190507Slulf \ 1154190507Slulf product(bool, CompactFields, true, \ 1155190507Slulf "Allocate nonstatic fields in gaps between previous fields") \ 1156190507Slulf \ 1157190507Slulf notproduct(bool, PrintCompactFieldsSavings, false, \ 1158190507Slulf "Print how many words were saved with CompactFields") \ 1159190507Slulf \ 1160190507Slulf notproduct(bool, PrintFieldLayout, false, \ 1161190507Slulf "Print field layout for each class") \ 1162190507Slulf \ 1163190507Slulf product(intx, ContendedPaddingWidth, 128, \ 1164190507Slulf "How many bytes to pad the fields/classes marked @Contended with")\ 1165135426Sle \ 1166190507Slulf product(bool, EnableContended, true, \ 1167190507Slulf "Enable @Contended annotation support") \ 1168190507Slulf \ 1169190507Slulf product(bool, RestrictContended, true, \ 1170190507Slulf "Restrict @Contended to trusted classes") \ 1171190507Slulf \ 1172190507Slulf product(bool, UseBiasedLocking, true, \ 1173190507Slulf "Enable biased locking in JVM") \ 1174190507Slulf \ 1175190507Slulf product(intx, BiasedLockingStartupDelay, 4000, \ 1176190507Slulf "Number of milliseconds to wait before enabling biased locking") \ 1177190507Slulf \ 1178190507Slulf diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1179190507Slulf "Print statistics of biased locking in JVM") \ 1180190507Slulf \ 1181190507Slulf product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1182190507Slulf "Threshold of number of revocations per type to try to " \ 1183190507Slulf "rebias all objects in the heap of that type") \ 1184190507Slulf \ 1185190507Slulf product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1186190507Slulf "Threshold of number of revocations per type to permanently " \ 1187190507Slulf "revoke biases of all objects in the heap of that type") \ 1188190507Slulf \ 1189190507Slulf product(intx, BiasedLockingDecayTime, 25000, \ 1190190507Slulf "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1191190507Slulf "type after previous bulk rebias") \ 1192190507Slulf \ 1193190507Slulf /* tracing */ \ 1194190507Slulf \ 1195190507Slulf notproduct(bool, TraceRuntimeCalls, false, \ 1196190507Slulf "Trace run-time calls") \ 1197190507Slulf \ 1198190507Slulf develop(bool, TraceJNICalls, false, \ 1199190507Slulf "Trace JNI calls") \ 1200190507Slulf \ 1201190507Slulf notproduct(bool, TraceJVMCalls, false, \ 1202190507Slulf "Trace JVM calls") \ 1203190507Slulf \ 1204190507Slulf product(ccstr, TraceJVMTI, NULL, \ 1205190507Slulf "Trace flags for JVMTI functions and events") \ 1206190507Slulf \ 1207190507Slulf /* This option can change an EMCP method into an obsolete method. */ \ 1208190507Slulf /* This can affect tests that except specific methods to be EMCP. */ \ 1209190507Slulf /* This option should be used with caution. */ \ 1210190507Slulf product(bool, StressLdcRewrite, false, \ 1211190507Slulf "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1212190507Slulf \ 1213190507Slulf product(intx, TraceRedefineClasses, 0, \ 1214190507Slulf "Trace level for JVMTI RedefineClasses") \ 1215190507Slulf \ 1216190507Slulf develop(bool, StressMethodComparator, false, \ 1217190507Slulf "run the MethodComparator on all loaded methods") \ 1218190507Slulf \ 1219190507Slulf /* change to false by default sometime after Mustang */ \ 1220190507Slulf product(bool, VerifyMergedCPBytecodes, true, \ 1221190507Slulf "Verify bytecodes after RedefineClasses constant pool merging") \ 1222190507Slulf \ 1223190507Slulf develop(bool, TraceJNIHandleAllocation, false, \ 1224190507Slulf "Trace allocation/deallocation of JNI handle blocks") \ 1225190507Slulf \ 1226190507Slulf develop(bool, TraceThreadEvents, false, \ 1227190507Slulf "Trace all thread events") \ 1228190507Slulf \ 1229190507Slulf develop(bool, TraceBytecodes, false, \ 1230190507Slulf "Trace bytecode execution") \ 1231190507Slulf \ 1232190507Slulf develop(bool, TraceClassInitialization, false, \ 1233190507Slulf "Trace class initialization") \ 1234190507Slulf \ 1235190507Slulf develop(bool, TraceExceptions, false, \ 1236190507Slulf "Trace exceptions") \ 1237190507Slulf \ 1238190507Slulf develop(bool, TraceICs, false, \ 1239190507Slulf "Trace inline cache changes") \ 1240190507Slulf \ 1241190507Slulf notproduct(bool, TraceInvocationCounterOverflow, false, \ 1242190507Slulf "Trace method invocation counter overflow") \ 1243190507Slulf \ 1244190507Slulf develop(bool, TraceInlineCacheClearing, false, \ 1245190507Slulf "Trace clearing of inline caches in nmethods") \ 1246190507Slulf \ 1247190507Slulf develop(bool, TraceDependencies, false, \ 1248190507Slulf "Trace dependencies") \ 1249190507Slulf \ 1250190507Slulf develop(bool, VerifyDependencies, trueInDebug, \ 1251190507Slulf "Exercise and verify the compilation dependency mechanism") \ 1252190507Slulf \ 1253190507Slulf develop(bool, TraceNewOopMapGeneration, false, \ 1254190507Slulf "Trace OopMapGeneration") \ 1255190507Slulf \ 1256190507Slulf develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1257190507Slulf "Trace OopMapGeneration: print detailed cell states") \ 1258190507Slulf \ 1259190507Slulf develop(bool, TimeOopMap, false, \ 1260190507Slulf "Time calls to GenerateOopMap::compute_map() in sum") \ 1261190507Slulf \ 1262190507Slulf develop(bool, TimeOopMap2, false, \ 1263190507Slulf "Time calls to GenerateOopMap::compute_map() individually") \ 1264190507Slulf \ 1265190507Slulf develop(bool, TraceMonitorMismatch, false, \ 1266190507Slulf "Trace monitor matching failures during OopMapGeneration") \ 1267190507Slulf \ 1268190507Slulf develop(bool, TraceOopMapRewrites, false, \ 1269190507Slulf "Trace rewritting of method oops during oop map generation") \ 1270190507Slulf \ 1271190507Slulf develop(bool, TraceSafepoint, false, \ 1272190507Slulf "Trace safepoint operations") \ 1273190507Slulf \ 1274190507Slulf develop(bool, TraceICBuffer, false, \ 1275190507Slulf "Trace usage of IC buffer") \ 1276190507Slulf \ 1277190507Slulf develop(bool, TraceCompiledIC, false, \ 1278190507Slulf "Trace changes of compiled IC") \ 1279190507Slulf \ 1280190507Slulf notproduct(bool, TraceZapDeadLocals, false, \ 1281190507Slulf "Trace zapping dead locals") \ 1282 \ 1283 develop(bool, TraceStartupTime, false, \ 1284 "Trace setup time") \ 1285 \ 1286 develop(bool, TraceProtectionDomainVerification, false, \ 1287 "Trace protection domain verifcation") \ 1288 \ 1289 develop(bool, TraceClearedExceptions, false, \ 1290 "Prints when an exception is forcibly cleared") \ 1291 \ 1292 product(bool, TraceClassResolution, false, \ 1293 "Trace all constant pool resolutions (for debugging)") \ 1294 \ 1295 product(bool, TraceBiasedLocking, false, \ 1296 "Trace biased locking in JVM") \ 1297 \ 1298 product(bool, TraceMonitorInflation, false, \ 1299 "Trace monitor inflation in JVM") \ 1300 \ 1301 /* gc */ \ 1302 \ 1303 product(bool, UseSerialGC, false, \ 1304 "Use the serial garbage collector") \ 1305 \ 1306 product(bool, UseG1GC, false, \ 1307 "Use the Garbage-First garbage collector") \ 1308 \ 1309 product(bool, UseParallelGC, false, \ 1310 "Use the Parallel Scavenge garbage collector") \ 1311 \ 1312 product(bool, UseParallelOldGC, false, \ 1313 "Use the Parallel Old garbage collector") \ 1314 \ 1315 product(uintx, HeapMaximumCompactionInterval, 20, \ 1316 "How often should we maximally compact the heap (not allowing " \ 1317 "any dead space)") \ 1318 \ 1319 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1320 "The collection count for the first maximum compaction") \ 1321 \ 1322 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1323 "In the Parallel Old garbage collector maximum compaction for " \ 1324 "a system GC") \ 1325 \ 1326 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1327 "The mean used by the par compact dead wood" \ 1328 "limiter (a number between 0-100).") \ 1329 \ 1330 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1331 "The standard deviation used by the par compact dead wood" \ 1332 "limiter (a number between 0-100).") \ 1333 \ 1334 product(uintx, ParallelGCThreads, 0, \ 1335 "Number of parallel threads parallel gc will use") \ 1336 \ 1337 product(bool, UseDynamicNumberOfGCThreads, false, \ 1338 "Dynamically choose the number of parallel threads " \ 1339 "parallel gc will use") \ 1340 \ 1341 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1342 "Force dynamic selection of the number of" \ 1343 "parallel threads parallel gc will use to aid debugging") \ 1344 \ 1345 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1346 "Size of heap (bytes) per GC thread used in calculating the " \ 1347 "number of GC threads") \ 1348 \ 1349 product(bool, TraceDynamicGCThreads, false, \ 1350 "Trace the dynamic GC thread usage") \ 1351 \ 1352 develop(bool, ParallelOldGCSplitALot, false, \ 1353 "Provoke splitting (copying data from a young gen space to" \ 1354 "multiple destination spaces)") \ 1355 \ 1356 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1357 "How often to provoke splitting a young gen space") \ 1358 \ 1359 product(uintx, ConcGCThreads, 0, \ 1360 "Number of threads concurrent gc will use") \ 1361 \ 1362 product(uintx, YoungPLABSize, 4096, \ 1363 "Size of young gen promotion labs (in HeapWords)") \ 1364 \ 1365 product(uintx, OldPLABSize, 1024, \ 1366 "Size of old gen promotion labs (in HeapWords)") \ 1367 \ 1368 product(uintx, GCTaskTimeStampEntries, 200, \ 1369 "Number of time stamp entries per gc worker thread") \ 1370 \ 1371 product(bool, AlwaysTenure, false, \ 1372 "Always tenure objects in eden. (ParallelGC only)") \ 1373 \ 1374 product(bool, NeverTenure, false, \ 1375 "Never tenure objects in eden, May tenure on overflow " \ 1376 "(ParallelGC only)") \ 1377 \ 1378 product(bool, ScavengeBeforeFullGC, true, \ 1379 "Scavenge youngest generation before each full GC, " \ 1380 "used with UseParallelGC") \ 1381 \ 1382 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1383 "Allow scavenges to occur when to_space contains objects.") \ 1384 \ 1385 product(bool, UseConcMarkSweepGC, false, \ 1386 "Use Concurrent Mark-Sweep GC in the old generation") \ 1387 \ 1388 product(bool, ExplicitGCInvokesConcurrent, false, \ 1389 "A System.gc() request invokes a concurrent collection;" \ 1390 " (effective only when UseConcMarkSweepGC)") \ 1391 \ 1392 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1393 "A System.gc() request invokes a concurrent collection and " \ 1394 "also unloads classes during such a concurrent gc cycle " \ 1395 "(effective only when UseConcMarkSweepGC)") \ 1396 \ 1397 product(bool, GCLockerInvokesConcurrent, false, \ 1398 "The exit of a JNI CS necessitating a scavenge also" \ 1399 " kicks off a bkgrd concurrent collection") \ 1400 \ 1401 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1402 "How much the GC can expand the eden by while the GC locker " \ 1403 "is active (as a percentage)") \ 1404 \ 1405 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1406 "Number of times to retry allocations when" \ 1407 " blocked by the GC locker") \ 1408 \ 1409 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1410 "Use Adaptive Free Lists in the CMS generation") \ 1411 \ 1412 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1413 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1414 \ 1415 develop(bool, RotateCMSCollectionTypes, false, \ 1416 "Rotate the CMS collections among concurrent and STW") \ 1417 \ 1418 product(bool, UseCMSBestFit, true, \ 1419 "Use CMS best fit allocation strategy") \ 1420 \ 1421 product(bool, UseCMSCollectionPassing, true, \ 1422 "Use passing of collection from background to foreground") \ 1423 \ 1424 product(bool, UseParNewGC, false, \ 1425 "Use parallel threads in the new generation.") \ 1426 \ 1427 product(bool, ParallelGCVerbose, false, \ 1428 "Verbose output for parallel GC.") \ 1429 \ 1430 product(intx, ParallelGCBufferWastePct, 10, \ 1431 "wasted fraction of parallel allocation buffer.") \ 1432 \ 1433 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1434 "Retain parallel allocation buffers across scavenges; " \ 1435 " -- disabled because this currently conflicts with " \ 1436 " parallel card scanning under certain conditions ") \ 1437 \ 1438 product(intx, TargetPLABWastePct, 10, \ 1439 "target wasted space in last buffer as pct of overall allocation")\ 1440 \ 1441 product(uintx, PLABWeight, 75, \ 1442 "Percentage (0-100) used to weight the current sample when" \ 1443 "computing exponentially decaying average for ResizePLAB.") \ 1444 \ 1445 product(bool, ResizePLAB, true, \ 1446 "Dynamically resize (survivor space) promotion labs") \ 1447 \ 1448 product(bool, PrintPLAB, false, \ 1449 "Print (survivor space) promotion labs sizing decisions") \ 1450 \ 1451 product(intx, ParGCArrayScanChunk, 50, \ 1452 "Scan a subset and push remainder, if array is bigger than this") \ 1453 \ 1454 product(bool, ParGCUseLocalOverflow, false, \ 1455 "Instead of a global overflow list, use local overflow stacks") \ 1456 \ 1457 product(bool, ParGCTrimOverflow, true, \ 1458 "Eagerly trim the local overflow lists (when ParGCUseLocalOverflow") \ 1459 \ 1460 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1461 "Whether we should simulate work queue overflow in ParNew") \ 1462 \ 1463 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1464 "An `interval' counter that determines how frequently " \ 1465 "we simulate overflow; a smaller number increases frequency") \ 1466 \ 1467 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1468 "The desired number of objects to claim from the overflow list") \ 1469 \ 1470 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1471 "The number of strides per worker thread that we divide up the " \ 1472 "card table scanning work into") \ 1473 \ 1474 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1475 "The number of cards in each chunk of the parallel chunks used " \ 1476 "during card table scanning") \ 1477 \ 1478 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1479 "Number of blocks to attempt to claim when refilling CMS LAB for "\ 1480 "parallel GC.") \ 1481 \ 1482 product(uintx, OldPLABWeight, 50, \ 1483 "Percentage (0-100) used to weight the current sample when" \ 1484 "computing exponentially decaying average for resizing CMSParPromoteBlocksToClaim.") \ 1485 \ 1486 product(bool, ResizeOldPLAB, true, \ 1487 "Dynamically resize (old gen) promotion labs") \ 1488 \ 1489 product(bool, PrintOldPLAB, false, \ 1490 "Print (old gen) promotion labs sizing decisions") \ 1491 \ 1492 product(uintx, CMSOldPLABMin, 16, \ 1493 "Min size of CMS gen promotion lab caches per worker per blksize")\ 1494 \ 1495 product(uintx, CMSOldPLABMax, 1024, \ 1496 "Max size of CMS gen promotion lab caches per worker per blksize")\ 1497 \ 1498 product(uintx, CMSOldPLABNumRefills, 4, \ 1499 "Nominal number of refills of CMS gen promotion lab cache" \ 1500 " per worker per block size") \ 1501 \ 1502 product(bool, CMSOldPLABResizeQuicker, false, \ 1503 "Whether to react on-the-fly during a scavenge to a sudden" \ 1504 " change in block demand rate") \ 1505 \ 1506 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1507 "The tolerance of the phase-change detector for on-the-fly" \ 1508 " PLAB resizing during a scavenge") \ 1509 \ 1510 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1511 "The gain in the feedback loop for on-the-fly PLAB resizing" \ 1512 " during a scavenge") \ 1513 \ 1514 product(bool, AlwaysPreTouch, false, \ 1515 "It forces all freshly committed pages to be pre-touched.") \ 1516 \ 1517 product_pd(intx, CMSYoungGenPerWorker, \ 1518 "The maximum size of young gen chosen by default per GC worker " \ 1519 "thread available") \ 1520 \ 1521 product(bool, CMSIncrementalMode, false, \ 1522 "Whether CMS GC should operate in \"incremental\" mode") \ 1523 \ 1524 product(uintx, CMSIncrementalDutyCycle, 10, \ 1525 "CMS incremental mode duty cycle (a percentage, 0-100). If" \ 1526 "CMSIncrementalPacing is enabled, then this is just the initial" \ 1527 "value") \ 1528 \ 1529 product(bool, CMSIncrementalPacing, true, \ 1530 "Whether the CMS incremental mode duty cycle should be " \ 1531 "automatically adjusted") \ 1532 \ 1533 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1534 "Lower bound on the duty cycle when CMSIncrementalPacing is " \ 1535 "enabled (a percentage, 0-100)") \ 1536 \ 1537 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1538 "Percentage (0-100) used to add conservatism when computing the " \ 1539 "duty cycle") \ 1540 \ 1541 product(uintx, CMSIncrementalOffset, 0, \ 1542 "Percentage (0-100) by which the CMS incremental mode duty cycle" \ 1543 " is shifted to the right within the period between young GCs") \ 1544 \ 1545 product(uintx, CMSExpAvgFactor, 50, \ 1546 "Percentage (0-100) used to weight the current sample when" \ 1547 "computing exponential averages for CMS statistics.") \ 1548 \ 1549 product(uintx, CMS_FLSWeight, 75, \ 1550 "Percentage (0-100) used to weight the current sample when" \ 1551 "computing exponentially decating averages for CMS FLS statistics.") \ 1552 \ 1553 product(uintx, CMS_FLSPadding, 1, \ 1554 "The multiple of deviation from mean to use for buffering" \ 1555 "against volatility in free list demand.") \ 1556 \ 1557 product(uintx, FLSCoalescePolicy, 2, \ 1558 "CMS: Aggression level for coalescing, increasing from 0 to 4") \ 1559 \ 1560 product(bool, FLSAlwaysCoalesceLarge, false, \ 1561 "CMS: Larger free blocks are always available for coalescing") \ 1562 \ 1563 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1564 "CMS: the smaller the percentage the greater the coalition force")\ 1565 \ 1566 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1567 "CMS: the factor by which to inflate estimated demand of small" \ 1568 " block sizes to prevent coalescing with an adjoining block") \ 1569 \ 1570 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1571 "CMS: the factor by which to inflate estimated demand of large" \ 1572 " block sizes to prevent coalescing with an adjoining block") \ 1573 \ 1574 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1575 "CMS: the factor by which to inflate estimated demand of small" \ 1576 " block sizes to prevent splitting to supply demand for smaller" \ 1577 " blocks") \ 1578 \ 1579 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1580 "CMS: the factor by which to inflate estimated demand of large" \ 1581 " block sizes to prevent splitting to supply demand for smaller" \ 1582 " blocks") \ 1583 \ 1584 product(bool, CMSExtrapolateSweep, false, \ 1585 "CMS: cushion for block demand during sweep") \ 1586 \ 1587 product(uintx, CMS_SweepWeight, 75, \ 1588 "Percentage (0-100) used to weight the current sample when " \ 1589 "computing exponentially decaying average for inter-sweep " \ 1590 "duration") \ 1591 \ 1592 product(uintx, CMS_SweepPadding, 1, \ 1593 "The multiple of deviation from mean to use for buffering " \ 1594 "against volatility in inter-sweep duration.") \ 1595 \ 1596 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1597 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1598 "duration exceeds this threhold in milliseconds") \ 1599 \ 1600 develop(bool, CMSTraceIncrementalMode, false, \ 1601 "Trace CMS incremental mode") \ 1602 \ 1603 develop(bool, CMSTraceIncrementalPacing, false, \ 1604 "Trace CMS incremental mode pacing computation") \ 1605 \ 1606 develop(bool, CMSTraceThreadState, false, \ 1607 "Trace the CMS thread state (enable the trace_state() method)") \ 1608 \ 1609 product(bool, CMSClassUnloadingEnabled, true, \ 1610 "Whether class unloading enabled when using CMS GC") \ 1611 \ 1612 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1613 "When CMS class unloading is enabled, the maximum CMS cycle count"\ 1614 " for which classes may not be unloaded") \ 1615 \ 1616 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1617 "Compact when asked to collect CMS gen with clear_all_soft_refs") \ 1618 \ 1619 product(bool, UseCMSCompactAtFullCollection, true, \ 1620 "Use mark sweep compact at full collections") \ 1621 \ 1622 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1623 "Number of CMS full collection done before compaction if > 0") \ 1624 \ 1625 develop(intx, CMSDictionaryChoice, 0, \ 1626 "Use BinaryTreeDictionary as default in the CMS generation") \ 1627 \ 1628 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1629 "Replenish an indexed free list with this number of chunks") \ 1630 \ 1631 product(bool, CMSReplenishIntermediate, true, \ 1632 "Replenish all intermediate free-list caches") \ 1633 \ 1634 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1635 "When satisfying batched demand, split blocks from the " \ 1636 "IndexedFreeList whose size is a multiple of requested size") \ 1637 \ 1638 product(bool, CMSLoopWarn, false, \ 1639 "Warn in case of excessive CMS looping") \ 1640 \ 1641 develop(bool, CMSOverflowEarlyRestoration, false, \ 1642 "Whether preserved marks should be restored early") \ 1643 \ 1644 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1645 "Size of marking stack") \ 1646 \ 1647 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1648 "Max size of marking stack") \ 1649 \ 1650 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1651 "Whether we should simulate frequent marking stack / work queue" \ 1652 " overflow") \ 1653 \ 1654 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1655 "An `interval' counter that determines how frequently" \ 1656 " we simulate overflow; a smaller number increases frequency") \ 1657 \ 1658 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1659 "(Temporary, subject to experimentation)" \ 1660 "Maximum number of abortable preclean iterations, if > 0") \ 1661 \ 1662 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1663 "(Temporary, subject to experimentation)" \ 1664 "Maximum time in abortable preclean in ms") \ 1665 \ 1666 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1667 "(Temporary, subject to experimentation)" \ 1668 "Nominal minimum work per abortable preclean iteration") \ 1669 \ 1670 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1671 "(Temporary, subject to experimentation)" \ 1672 " Time that we sleep between iterations when not given" \ 1673 " enough work per iteration") \ 1674 \ 1675 product(uintx, CMSRescanMultiple, 32, \ 1676 "Size (in cards) of CMS parallel rescan task") \ 1677 \ 1678 product(uintx, CMSConcMarkMultiple, 32, \ 1679 "Size (in cards) of CMS concurrent MT marking task") \ 1680 \ 1681 product(bool, CMSAbortSemantics, false, \ 1682 "Whether abort-on-overflow semantics is implemented") \ 1683 \ 1684 product(bool, CMSParallelRemarkEnabled, true, \ 1685 "Whether parallel remark enabled (only if ParNewGC)") \ 1686 \ 1687 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1688 "Whether parallel remark of survivor space" \ 1689 " enabled (effective only if CMSParallelRemarkEnabled)") \ 1690 \ 1691 product(bool, CMSPLABRecordAlways, true, \ 1692 "Whether to always record survivor space PLAB bdries" \ 1693 " (effective only if CMSParallelSurvivorRemarkEnabled)") \ 1694 \ 1695 product(bool, CMSConcurrentMTEnabled, true, \ 1696 "Whether multi-threaded concurrent work enabled (if ParNewGC)") \ 1697 \ 1698 product(bool, CMSPrecleaningEnabled, true, \ 1699 "Whether concurrent precleaning enabled") \ 1700 \ 1701 product(uintx, CMSPrecleanIter, 3, \ 1702 "Maximum number of precleaning iteration passes") \ 1703 \ 1704 product(uintx, CMSPrecleanNumerator, 2, \ 1705 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1706 " ratio") \ 1707 \ 1708 product(uintx, CMSPrecleanDenominator, 3, \ 1709 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence" \ 1710 " ratio") \ 1711 \ 1712 product(bool, CMSPrecleanRefLists1, true, \ 1713 "Preclean ref lists during (initial) preclean phase") \ 1714 \ 1715 product(bool, CMSPrecleanRefLists2, false, \ 1716 "Preclean ref lists during abortable preclean phase") \ 1717 \ 1718 product(bool, CMSPrecleanSurvivors1, false, \ 1719 "Preclean survivors during (initial) preclean phase") \ 1720 \ 1721 product(bool, CMSPrecleanSurvivors2, true, \ 1722 "Preclean survivors during abortable preclean phase") \ 1723 \ 1724 product(uintx, CMSPrecleanThreshold, 1000, \ 1725 "Don't re-iterate if #dirty cards less than this") \ 1726 \ 1727 product(bool, CMSCleanOnEnter, true, \ 1728 "Clean-on-enter optimization for reducing number of dirty cards") \ 1729 \ 1730 product(uintx, CMSRemarkVerifyVariant, 1, \ 1731 "Choose variant (1,2) of verification following remark") \ 1732 \ 1733 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1734 "If Eden used is below this value, don't try to schedule remark") \ 1735 \ 1736 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1737 "The Eden occupancy % at which to try and schedule remark pause") \ 1738 \ 1739 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1740 "Start sampling Eden top at least before yg occupancy reaches" \ 1741 " 1/<ratio> of the size at which we plan to schedule remark") \ 1742 \ 1743 product(uintx, CMSSamplingGrain, 16*K, \ 1744 "The minimum distance between eden samples for CMS (see above)") \ 1745 \ 1746 product(bool, CMSScavengeBeforeRemark, false, \ 1747 "Attempt scavenge before the CMS remark step") \ 1748 \ 1749 develop(bool, CMSTraceSweeper, false, \ 1750 "Trace some actions of the CMS sweeper") \ 1751 \ 1752 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1753 "Don't drain below this size per parallel worker/thief") \ 1754 \ 1755 manageable(intx, CMSWaitDuration, 2000, \ 1756 "Time in milliseconds that CMS thread waits for young GC") \ 1757 \ 1758 develop(uintx, CMSCheckInterval, 1000, \ 1759 "Interval in milliseconds that CMS thread checks if it " \ 1760 "should start a collection cycle") \ 1761 \ 1762 product(bool, CMSYield, true, \ 1763 "Yield between steps of concurrent mark & sweep") \ 1764 \ 1765 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1766 "Bitmap operations should process at most this many bits" \ 1767 "between yields") \ 1768 \ 1769 product(bool, CMSDumpAtPromotionFailure, false, \ 1770 "Dump useful information about the state of the CMS old " \ 1771 " generation upon a promotion failure.") \ 1772 \ 1773 product(bool, CMSPrintChunksInDump, false, \ 1774 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1775 " more detailed information about the free chunks.") \ 1776 \ 1777 product(bool, CMSPrintObjectsInDump, false, \ 1778 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1779 " more detailed information about the allocated objects.") \ 1780 \ 1781 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1782 "Verify that all refs across the FLS boundary " \ 1783 " are to valid objects") \ 1784 \ 1785 diagnostic(bool, FLSVerifyLists, false, \ 1786 "Do lots of (expensive) FreeListSpace verification") \ 1787 \ 1788 diagnostic(bool, FLSVerifyIndexTable, false, \ 1789 "Do lots of (expensive) FLS index table verification") \ 1790 \ 1791 develop(bool, FLSVerifyDictionary, false, \ 1792 "Do lots of (expensive) FLS dictionary verification") \ 1793 \ 1794 develop(bool, VerifyBlockOffsetArray, false, \ 1795 "Do (expensive!) block offset array verification") \ 1796 \ 1797 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1798 "Maintain _unallocated_block in BlockOffsetArray" \ 1799 " (currently applicable only to CMS collector)") \ 1800 \ 1801 develop(bool, TraceCMSState, false, \ 1802 "Trace the state of the CMS collection") \ 1803 \ 1804 product(intx, RefDiscoveryPolicy, 0, \ 1805 "Whether reference-based(0) or referent-based(1)") \ 1806 \ 1807 product(bool, ParallelRefProcEnabled, false, \ 1808 "Enable parallel reference processing whenever possible") \ 1809 \ 1810 product(bool, ParallelRefProcBalancingEnabled, true, \ 1811 "Enable balancing of reference processing queues") \ 1812 \ 1813 product(uintx, CMSTriggerRatio, 80, \ 1814 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1815 "allocated before a CMS collection cycle commences") \ 1816 \ 1817 product(uintx, CMSBootstrapOccupancy, 50, \ 1818 "Percentage CMS generation occupancy at which to " \ 1819 "initiate CMS collection for bootstrapping collection stats") \ 1820 \ 1821 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1822 "Percentage CMS generation occupancy to start a CMS collection " \ 1823 "cycle. A negative value means that CMSTriggerRatio is used") \ 1824 \ 1825 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1826 "Percentage of the (entire) heap occupancy to start a " \ 1827 "concurrent GC cycle. It is used by GCs that trigger a " \ 1828 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1829 "not just one of the generations (e.g., G1). A value of 0 " \ 1830 "denotes 'do constant GC cycles'.") \ 1831 \ 1832 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1833 "Only use occupancy as a crierion for starting a CMS collection") \ 1834 \ 1835 product(intx, CMSIsTooFullPercentage, 98, \ 1836 "An absolute ceiling above which CMS will always consider the " \ 1837 "unloading of classes when class unloading is enabled") \ 1838 \ 1839 develop(bool, CMSTestInFreeList, false, \ 1840 "Check if the coalesced range is already in the " \ 1841 "free lists as claimed") \ 1842 \ 1843 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1844 "Check that all the garbage collected was returned to the " \ 1845 "free lists.") \ 1846 \ 1847 notproduct(bool, ScavengeALot, false, \ 1848 "Force scavenge at every Nth exit from the runtime system " \ 1849 "(N=ScavengeALotInterval)") \ 1850 \ 1851 develop(bool, FullGCALot, false, \ 1852 "Force full gc at every Nth exit from the runtime system " \ 1853 "(N=FullGCALotInterval)") \ 1854 \ 1855 notproduct(bool, GCALotAtAllSafepoints, false, \ 1856 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1857 \ 1858 product(bool, PrintPromotionFailure, false, \ 1859 "Print additional diagnostic information following " \ 1860 " promotion failure") \ 1861 \ 1862 notproduct(bool, PromotionFailureALot, false, \ 1863 "Use promotion failure handling on every youngest generation " \ 1864 "collection") \ 1865 \ 1866 develop(uintx, PromotionFailureALotCount, 1000, \ 1867 "Number of promotion failures occurring at ParGCAllocBuffer" \ 1868 "refill attempts (ParNew) or promotion attempts " \ 1869 "(other young collectors) ") \ 1870 \ 1871 develop(uintx, PromotionFailureALotInterval, 5, \ 1872 "Total collections between promotion failures alot") \ 1873 \ 1874 experimental(intx, WorkStealingSleepMillis, 1, \ 1875 "Sleep time when sleep is used for yields") \ 1876 \ 1877 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1878 "Number of yields before a sleep is done during workstealing") \ 1879 \ 1880 experimental(uintx, WorkStealingHardSpins, 4096, \ 1881 "Number of iterations in a spin loop between checks on " \ 1882 "time out of hard spin") \ 1883 \ 1884 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1885 "Ratio of hard spins to calls to yield") \ 1886 \ 1887 develop(uintx, ObjArrayMarkingStride, 512, \ 1888 "Number of ObjArray elements to push onto the marking stack" \ 1889 "before pushing a continuation entry") \ 1890 \ 1891 develop(bool, MetadataAllocationFailALot, false, \ 1892 "Fail metadata allocations at intervals controlled by " \ 1893 "MetadataAllocationFailALotInterval") \ 1894 \ 1895 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 1896 "metadata allocation failure alot interval") \ 1897 \ 1898 develop(bool, MetaDataDeallocateALot, false, \ 1899 "Deallocation bunches of metadata at intervals controlled by " \ 1900 "MetaDataAllocateALotInterval") \ 1901 \ 1902 develop(uintx, MetaDataDeallocateALotInterval, 100, \ 1903 "Metadata deallocation alot interval") \ 1904 \ 1905 develop(bool, TraceMetadataChunkAllocation, false, \ 1906 "Trace chunk metadata allocations") \ 1907 \ 1908 product(bool, TraceMetadataHumongousAllocation, false, \ 1909 "Trace humongous metadata allocations") \ 1910 \ 1911 develop(bool, TraceMetavirtualspaceAllocation, false, \ 1912 "Trace virtual space metadata allocations") \ 1913 \ 1914 notproduct(bool, ExecuteInternalVMTests, false, \ 1915 "Enable execution of internal VM tests.") \ 1916 \ 1917 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 1918 \ 1919 product_pd(bool, ResizeTLAB, \ 1920 "Dynamically resize tlab size for threads") \ 1921 \ 1922 product(bool, ZeroTLAB, false, \ 1923 "Zero out the newly created TLAB") \ 1924 \ 1925 product(bool, FastTLABRefill, true, \ 1926 "Use fast TLAB refill code") \ 1927 \ 1928 product(bool, PrintTLAB, false, \ 1929 "Print various TLAB related information") \ 1930 \ 1931 product(bool, TLABStats, true, \ 1932 "Print various TLAB related information") \ 1933 \ 1934 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 1935 "Enable LowMemoryProtection")) \ 1936 \ 1937 product_pd(bool, NeverActAsServerClassMachine, \ 1938 "Never act like a server-class machine") \ 1939 \ 1940 product(bool, AlwaysActAsServerClassMachine, false, \ 1941 "Always act like a server-class machine") \ 1942 \ 1943 product_pd(uint64_t, MaxRAM, \ 1944 "Real memory size (in bytes) used to set maximum heap size") \ 1945 \ 1946 product(uintx, ErgoHeapSizeLimit, 0, \ 1947 "Maximum ergonomically set heap size (in bytes); zero means use " \ 1948 "MaxRAM / MaxRAMFraction") \ 1949 \ 1950 product(uintx, MaxRAMFraction, 4, \ 1951 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1952 "size") \ 1953 \ 1954 product(uintx, DefaultMaxRAMFraction, 4, \ 1955 "Maximum fraction (1/n) of real memory used for maximum heap " \ 1956 "size; deprecated: to be renamed to MaxRAMFraction") \ 1957 \ 1958 product(uintx, MinRAMFraction, 2, \ 1959 "Minimum fraction (1/n) of real memory used for maxmimum heap " \ 1960 "size on systems with small physical memory size") \ 1961 \ 1962 product(uintx, InitialRAMFraction, 64, \ 1963 "Fraction (1/n) of real memory used for initial heap size") \ 1964 \ 1965 product(bool, UseAutoGCSelectPolicy, false, \ 1966 "Use automatic collection selection policy") \ 1967 \ 1968 product(uintx, AutoGCSelectPauseMillis, 5000, \ 1969 "Automatic GC selection pause threshhold in ms") \ 1970 \ 1971 product(bool, UseAdaptiveSizePolicy, true, \ 1972 "Use adaptive generation sizing policies") \ 1973 \ 1974 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 1975 "Use adaptive survivor sizing policies") \ 1976 \ 1977 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 1978 "Use adaptive young-old sizing policies at minor collections") \ 1979 \ 1980 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 1981 "Use adaptive young-old sizing policies at major collections") \ 1982 \ 1983 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 1984 "Use statistics from System.GC for adaptive size policy") \ 1985 \ 1986 product(bool, UseAdaptiveGCBoundary, false, \ 1987 "Allow young-old boundary to move") \ 1988 \ 1989 develop(bool, TraceAdaptiveGCBoundary, false, \ 1990 "Trace young-old boundary moves") \ 1991 \ 1992 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 1993 "Resize the virtual spaces of the young or old generations") \ 1994 \ 1995 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 1996 "Policy for changeing generation size for throughput goals") \ 1997 \ 1998 product(uintx, AdaptiveSizePausePolicy, 0, \ 1999 "Policy for changing generation size for pause goals") \ 2000 \ 2001 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2002 "Adjust tenured generation to achive a minor pause goal") \ 2003 \ 2004 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2005 "Adjust young generation to achive a major pause goal") \ 2006 \ 2007 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2008 "Number of steps where heuristics is used before data is used") \ 2009 \ 2010 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2011 "Number of collections before the adaptive sizing is started") \ 2012 \ 2013 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2014 "Collecton interval for printing information; zero => never") \ 2015 \ 2016 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2017 "Use adaptive minimum footprint as a goal") \ 2018 \ 2019 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2020 "Weight given to exponential resizing, between 0 and 100") \ 2021 \ 2022 product(uintx, AdaptiveTimeWeight, 25, \ 2023 "Weight given to time in adaptive policy, between 0 and 100") \ 2024 \ 2025 product(uintx, PausePadding, 1, \ 2026 "How much buffer to keep for pause time") \ 2027 \ 2028 product(uintx, PromotedPadding, 3, \ 2029 "How much buffer to keep for promotion failure") \ 2030 \ 2031 product(uintx, SurvivorPadding, 3, \ 2032 "How much buffer to keep for survivor overflow") \ 2033 \ 2034 product(uintx, ThresholdTolerance, 10, \ 2035 "Allowed collection cost difference between generations") \ 2036 \ 2037 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2038 "If collection costs are within margin, reduce both by full " \ 2039 "delta") \ 2040 \ 2041 product(uintx, YoungGenerationSizeIncrement, 20, \ 2042 "Adaptive size percentage change in young generation") \ 2043 \ 2044 product(uintx, YoungGenerationSizeSupplement, 80, \ 2045 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2046 \ 2047 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2048 "Decay factor to YoungedGenerationSizeSupplement") \ 2049 \ 2050 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2051 "Adaptive size percentage change in tenured generation") \ 2052 \ 2053 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2054 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2055 \ 2056 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2057 "Decay factor to TenuredGenerationSizeIncrement") \ 2058 \ 2059 product(uintx, MaxGCPauseMillis, max_uintx, \ 2060 "Adaptive size policy maximum GC pause time goal in msec, " \ 2061 "or (G1 Only) the max. GC time per MMU time slice") \ 2062 \ 2063 product(uintx, GCPauseIntervalMillis, 0, \ 2064 "Time slice for MMU specification") \ 2065 \ 2066 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2067 "Adaptive size policy maximum GC minor pause time goal in msec") \ 2068 \ 2069 product(uintx, GCTimeRatio, 99, \ 2070 "Adaptive size policy application time to GC time ratio") \ 2071 \ 2072 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2073 "Adaptive size scale down factor for shrinking") \ 2074 \ 2075 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2076 "Adaptive size decays the major cost for long major intervals") \ 2077 \ 2078 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2079 "Time scale over which major costs decay") \ 2080 \ 2081 product(uintx, MinSurvivorRatio, 3, \ 2082 "Minimum ratio of young generation/survivor space size") \ 2083 \ 2084 product(uintx, InitialSurvivorRatio, 8, \ 2085 "Initial ratio of eden/survivor space size") \ 2086 \ 2087 product(uintx, BaseFootPrintEstimate, 256*M, \ 2088 "Estimate of footprint other than Java Heap") \ 2089 \ 2090 product(bool, UseGCOverheadLimit, true, \ 2091 "Use policy to limit of proportion of time spent in GC " \ 2092 "before an OutOfMemory error is thrown") \ 2093 \ 2094 product(uintx, GCTimeLimit, 98, \ 2095 "Limit of proportion of time spent in GC before an OutOfMemory" \ 2096 "error is thrown (used with GCHeapFreeLimit)") \ 2097 \ 2098 product(uintx, GCHeapFreeLimit, 2, \ 2099 "Minimum percentage of free space after a full GC before an " \ 2100 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2101 \ 2102 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2103 "Number of consecutive collections before gc time limit fires") \ 2104 \ 2105 product(bool, PrintAdaptiveSizePolicy, false, \ 2106 "Print information about AdaptiveSizePolicy") \ 2107 \ 2108 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2109 "How far ahead to prefetch destination area (<= 0 means off)") \ 2110 \ 2111 product(intx, PrefetchScanIntervalInBytes, -1, \ 2112 "How far ahead to prefetch scan area (<= 0 means off)") \ 2113 \ 2114 product(intx, PrefetchFieldsAhead, -1, \ 2115 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2116 \ 2117 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2118 "Verify system before exiting") \ 2119 \ 2120 diagnostic(bool, VerifyBeforeGC, false, \ 2121 "Verify memory system before GC") \ 2122 \ 2123 diagnostic(bool, VerifyAfterGC, false, \ 2124 "Verify memory system after GC") \ 2125 \ 2126 diagnostic(bool, VerifyDuringGC, false, \ 2127 "Verify memory system during GC (between phases)") \ 2128 \ 2129 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2130 "Enable parallel memory system verification") \ 2131 \ 2132 diagnostic(bool, DeferInitialCardMark, false, \ 2133 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2134 "may arise from new_pre_store_barrier") \ 2135 \ 2136 diagnostic(bool, VerifyRememberedSets, false, \ 2137 "Verify GC remembered sets") \ 2138 \ 2139 diagnostic(bool, VerifyObjectStartArray, true, \ 2140 "Verify GC object start array if verify before/after") \ 2141 \ 2142 product(bool, DisableExplicitGC, false, \ 2143 "Tells whether calling System.gc() does a full GC") \ 2144 \ 2145 notproduct(bool, CheckMemoryInitialization, false, \ 2146 "Checks memory initialization") \ 2147 \ 2148 product(bool, CollectGen0First, false, \ 2149 "Collect youngest generation before each full GC") \ 2150 \ 2151 diagnostic(bool, BindCMSThreadToCPU, false, \ 2152 "Bind CMS Thread to CPU if possible") \ 2153 \ 2154 diagnostic(uintx, CPUForCMSThread, 0, \ 2155 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2156 \ 2157 product(bool, BindGCTaskThreadsToCPUs, false, \ 2158 "Bind GCTaskThreads to CPUs if possible") \ 2159 \ 2160 product(bool, UseGCTaskAffinity, false, \ 2161 "Use worker affinity when asking for GCTasks") \ 2162 \ 2163 product(uintx, ProcessDistributionStride, 4, \ 2164 "Stride through processors when distributing processes") \ 2165 \ 2166 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2167 "number of times the coordinator GC thread will sleep while " \ 2168 "yielding before giving up and resuming GC") \ 2169 \ 2170 product(uintx, CMSYieldSleepCount, 0, \ 2171 "number of times a GC thread (minus the coordinator) " \ 2172 "will sleep while yielding before giving up and resuming GC") \ 2173 \ 2174 /* gc tracing */ \ 2175 manageable(bool, PrintGC, false, \ 2176 "Print message at garbage collect") \ 2177 \ 2178 manageable(bool, PrintGCDetails, false, \ 2179 "Print more details at garbage collect") \ 2180 \ 2181 manageable(bool, PrintGCDateStamps, false, \ 2182 "Print date stamps at garbage collect") \ 2183 \ 2184 manageable(bool, PrintGCTimeStamps, false, \ 2185 "Print timestamps at garbage collect") \ 2186 \ 2187 product(bool, PrintGCTaskTimeStamps, false, \ 2188 "Print timestamps for individual gc worker thread tasks") \ 2189 \ 2190 develop(intx, ConcGCYieldTimeout, 0, \ 2191 "If non-zero, assert that GC threads yield within this # of ms.") \ 2192 \ 2193 notproduct(bool, TraceMarkSweep, false, \ 2194 "Trace mark sweep") \ 2195 \ 2196 product(bool, PrintReferenceGC, false, \ 2197 "Print times spent handling reference objects during GC " \ 2198 " (enabled only when PrintGCDetails)") \ 2199 \ 2200 develop(bool, TraceReferenceGC, false, \ 2201 "Trace handling of soft/weak/final/phantom references") \ 2202 \ 2203 develop(bool, TraceFinalizerRegistration, false, \ 2204 "Trace registration of final references") \ 2205 \ 2206 notproduct(bool, TraceScavenge, false, \ 2207 "Trace scavenge") \ 2208 \ 2209 product_rw(bool, TraceClassLoading, false, \ 2210 "Trace all classes loaded") \ 2211 \ 2212 product(bool, TraceClassLoadingPreorder, false, \ 2213 "Trace all classes loaded in order referenced (not loaded)") \ 2214 \ 2215 product_rw(bool, TraceClassUnloading, false, \ 2216 "Trace unloading of classes") \ 2217 \ 2218 product_rw(bool, TraceLoaderConstraints, false, \ 2219 "Trace loader constraints") \ 2220 \ 2221 develop(bool, TraceClassLoaderData, false, \ 2222 "Trace class loader loader_data lifetime") \ 2223 \ 2224 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2225 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2226 "Initial size of the boot class loader data metaspace") \ 2227 \ 2228 product(bool, TraceGen0Time, false, \ 2229 "Trace accumulated time for Gen 0 collection") \ 2230 \ 2231 product(bool, TraceGen1Time, false, \ 2232 "Trace accumulated time for Gen 1 collection") \ 2233 \ 2234 product(bool, PrintTenuringDistribution, false, \ 2235 "Print tenuring age information") \ 2236 \ 2237 product_rw(bool, PrintHeapAtGC, false, \ 2238 "Print heap layout before and after each GC") \ 2239 \ 2240 product_rw(bool, PrintHeapAtGCExtended, false, \ 2241 "Prints extended information about the layout of the heap " \ 2242 "when -XX:+PrintHeapAtGC is set") \ 2243 \ 2244 product(bool, PrintHeapAtSIGBREAK, true, \ 2245 "Print heap layout in response to SIGBREAK") \ 2246 \ 2247 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2248 "Print a class histogram before any major stop-world GC") \ 2249 \ 2250 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2251 "Print a class histogram after any major stop-world GC") \ 2252 \ 2253 manageable(bool, PrintClassHistogram, false, \ 2254 "Print a histogram of class instances") \ 2255 \ 2256 develop(bool, TraceWorkGang, false, \ 2257 "Trace activities of work gangs") \ 2258 \ 2259 product(bool, TraceParallelOldGCTasks, false, \ 2260 "Trace multithreaded GC activity") \ 2261 \ 2262 develop(bool, TraceBlockOffsetTable, false, \ 2263 "Print BlockOffsetTable maps") \ 2264 \ 2265 develop(bool, TraceCardTableModRefBS, false, \ 2266 "Print CardTableModRefBS maps") \ 2267 \ 2268 develop(bool, TraceGCTaskManager, false, \ 2269 "Trace actions of the GC task manager") \ 2270 \ 2271 develop(bool, TraceGCTaskQueue, false, \ 2272 "Trace actions of the GC task queues") \ 2273 \ 2274 diagnostic(bool, TraceGCTaskThread, false, \ 2275 "Trace actions of the GC task threads") \ 2276 \ 2277 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2278 "Print the time taken by each parallel old gc phase." \ 2279 "PrintGCDetails must also be enabled.") \ 2280 \ 2281 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2282 "Trace parallel old gc marking phase") \ 2283 \ 2284 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2285 "Trace parallel old gc summary phase") \ 2286 \ 2287 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2288 "Trace parallel old gc compaction phase") \ 2289 \ 2290 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2291 "Trace parallel old gc dense prefix computation") \ 2292 \ 2293 develop(bool, IgnoreLibthreadGPFault, false, \ 2294 "Suppress workaround for libthread GP fault") \ 2295 \ 2296 product(bool, PrintJNIGCStalls, false, \ 2297 "Print diagnostic message when GC is stalled" \ 2298 "by JNI critical section") \ 2299 \ 2300 /* GC log rotation setting */ \ 2301 \ 2302 product(bool, UseGCLogFileRotation, false, \ 2303 "Prevent large gclog file for long running app. " \ 2304 "Requires -Xloggc:<filename>") \ 2305 \ 2306 product(uintx, NumberOfGCLogFiles, 0, \ 2307 "Number of gclog files in rotation, " \ 2308 "Default: 0, no rotation") \ 2309 \ 2310 product(uintx, GCLogFileSize, 0, \ 2311 "GC log file size, Default: 0 bytes, no rotation " \ 2312 "Only valid with UseGCLogFileRotation") \ 2313 \ 2314 /* JVMTI heap profiling */ \ 2315 \ 2316 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2317 "Trace JVMTI object tagging calls") \ 2318 \ 2319 diagnostic(bool, VerifyBeforeIteration, false, \ 2320 "Verify memory system before JVMTI iteration") \ 2321 \ 2322 /* compiler interface */ \ 2323 \ 2324 develop(bool, CIPrintCompilerName, false, \ 2325 "when CIPrint is active, print the name of the active compiler") \ 2326 \ 2327 develop(bool, CIPrintCompileQueue, false, \ 2328 "display the contents of the compile queue whenever a " \ 2329 "compilation is enqueued") \ 2330 \ 2331 develop(bool, CIPrintRequests, false, \ 2332 "display every request for compilation") \ 2333 \ 2334 product(bool, CITime, false, \ 2335 "collect timing information for compilation") \ 2336 \ 2337 develop(bool, CITimeEach, false, \ 2338 "display timing information after each successful compilation") \ 2339 \ 2340 develop(bool, CICountOSR, false, \ 2341 "use a separate counter when assigning ids to osr compilations") \ 2342 \ 2343 develop(bool, CICompileNatives, true, \ 2344 "compile native methods if supported by the compiler") \ 2345 \ 2346 develop_pd(bool, CICompileOSR, \ 2347 "compile on stack replacement methods if supported by the " \ 2348 "compiler") \ 2349 \ 2350 develop(bool, CIPrintMethodCodes, false, \ 2351 "print method bytecodes of the compiled code") \ 2352 \ 2353 develop(bool, CIPrintTypeFlow, false, \ 2354 "print the results of ciTypeFlow analysis") \ 2355 \ 2356 develop(bool, CITraceTypeFlow, false, \ 2357 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2358 \ 2359 develop(intx, OSROnlyBCI, -1, \ 2360 "OSR only at this bci. Negative values mean exclude that bci") \ 2361 \ 2362 /* compiler */ \ 2363 \ 2364 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2365 "Number of compiler threads to run") \ 2366 \ 2367 product(intx, CompilationPolicyChoice, 0, \ 2368 "which compilation policy (0/1)") \ 2369 \ 2370 develop(bool, UseStackBanging, true, \ 2371 "use stack banging for stack overflow checks (required for " \ 2372 "proper StackOverflow handling; disable only to measure cost " \ 2373 "of stackbanging)") \ 2374 \ 2375 develop(bool, UseStrictFP, true, \ 2376 "use strict fp if modifier strictfp is set") \ 2377 \ 2378 develop(bool, GenerateSynchronizationCode, true, \ 2379 "generate locking/unlocking code for synchronized methods and " \ 2380 "monitors") \ 2381 \ 2382 develop(bool, GenerateCompilerNullChecks, true, \ 2383 "Generate explicit null checks for loads/stores/calls") \ 2384 \ 2385 develop(bool, GenerateRangeChecks, true, \ 2386 "Generate range checks for array accesses") \ 2387 \ 2388 develop_pd(bool, ImplicitNullChecks, \ 2389 "generate code for implicit null checks") \ 2390 \ 2391 product(bool, PrintSafepointStatistics, false, \ 2392 "print statistics about safepoint synchronization") \ 2393 \ 2394 product(intx, PrintSafepointStatisticsCount, 300, \ 2395 "total number of safepoint statistics collected " \ 2396 "before printing them out") \ 2397 \ 2398 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2399 "print safepoint statistics only when safepoint takes" \ 2400 " more than PrintSafepointSatisticsTimeout in millis") \ 2401 \ 2402 product(bool, TraceSafepointCleanupTime, false, \ 2403 "print the break down of clean up tasks performed during" \ 2404 " safepoint") \ 2405 \ 2406 product(bool, Inline, true, \ 2407 "enable inlining") \ 2408 \ 2409 product(bool, ClipInlining, true, \ 2410 "clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2411 \ 2412 develop(bool, UseCHA, true, \ 2413 "enable CHA") \ 2414 \ 2415 product(bool, UseTypeProfile, true, \ 2416 "Check interpreter profile for historically monomorphic calls") \ 2417 \ 2418 notproduct(bool, TimeCompiler, false, \ 2419 "time the compiler") \ 2420 \ 2421 diagnostic(bool, PrintInlining, false, \ 2422 "prints inlining optimizations") \ 2423 \ 2424 product(bool, UsePopCountInstruction, false, \ 2425 "Use population count instruction") \ 2426 \ 2427 develop(bool, EagerInitialization, false, \ 2428 "Eagerly initialize classes if possible") \ 2429 \ 2430 develop(bool, TraceMethodReplacement, false, \ 2431 "Print when methods are replaced do to recompilation") \ 2432 \ 2433 develop(bool, PrintMethodFlushing, false, \ 2434 "print the nmethods being flushed") \ 2435 \ 2436 develop(bool, UseRelocIndex, false, \ 2437 "use an index to speed random access to relocations") \ 2438 \ 2439 develop(bool, StressCodeBuffers, false, \ 2440 "Exercise code buffer expansion and other rare state changes") \ 2441 \ 2442 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2443 "Generate extra debugging info for non-safepoints in nmethods") \ 2444 \ 2445 product(bool, PrintVMOptions, false, \ 2446 "Print flags that appeared on the command line") \ 2447 \ 2448 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2449 "Ignore unrecognized VM options") \ 2450 \ 2451 product(bool, PrintCommandLineFlags, false, \ 2452 "Print flags specified on command line or set by ergonomics") \ 2453 \ 2454 product(bool, PrintFlagsInitial, false, \ 2455 "Print all VM flags before argument processing and exit VM") \ 2456 \ 2457 product(bool, PrintFlagsFinal, false, \ 2458 "Print all VM flags after argument and ergonomic processing") \ 2459 \ 2460 notproduct(bool, PrintFlagsWithComments, false, \ 2461 "Print all VM flags with default values and descriptions and exit")\ 2462 \ 2463 diagnostic(bool, SerializeVMOutput, true, \ 2464 "Use a mutex to serialize output to tty and hotspot.log") \ 2465 \ 2466 diagnostic(bool, DisplayVMOutput, true, \ 2467 "Display all VM output on the tty, independently of LogVMOutput") \ 2468 \ 2469 diagnostic(bool, LogVMOutput, trueInDebug, \ 2470 "Save VM output to hotspot.log, or to LogFile") \ 2471 \ 2472 diagnostic(ccstr, LogFile, NULL, \ 2473 "If LogVMOutput is on, save VM output to this file [hotspot.log]") \ 2474 \ 2475 product(ccstr, ErrorFile, NULL, \ 2476 "If an error occurs, save the error data to this file " \ 2477 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2478 \ 2479 product(bool, DisplayVMOutputToStderr, false, \ 2480 "If DisplayVMOutput is true, display all VM output to stderr") \ 2481 \ 2482 product(bool, DisplayVMOutputToStdout, false, \ 2483 "If DisplayVMOutput is true, display all VM output to stdout") \ 2484 \ 2485 product(bool, UseHeavyMonitors, false, \ 2486 "use heavyweight instead of lightweight Java monitors") \ 2487 \ 2488 product(bool, PrintStringTableStatistics, false, \ 2489 "print statistics about the StringTable and SymbolTable") \ 2490 \ 2491 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2492 "print histogram of the symbol table") \ 2493 \ 2494 notproduct(bool, ExitVMOnVerifyError, false, \ 2495 "standard exit from VM if bytecode verify error " \ 2496 "(only in debug mode)") \ 2497 \ 2498 notproduct(ccstr, AbortVMOnException, NULL, \ 2499 "Call fatal if this exception is thrown. Example: " \ 2500 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2501 \ 2502 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2503 "Call fatal if the exception pointed by AbortVMOnException " \ 2504 "has this message.") \ 2505 \ 2506 develop(bool, DebugVtables, false, \ 2507 "add debugging code to vtable dispatch") \ 2508 \ 2509 develop(bool, PrintVtables, false, \ 2510 "print vtables when printing klass") \ 2511 \ 2512 notproduct(bool, PrintVtableStats, false, \ 2513 "print vtables stats at end of run") \ 2514 \ 2515 develop(bool, TraceCreateZombies, false, \ 2516 "trace creation of zombie nmethods") \ 2517 \ 2518 notproduct(bool, IgnoreLockingAssertions, false, \ 2519 "disable locking assertions (for speed)") \ 2520 \ 2521 product(bool, RangeCheckElimination, true, \ 2522 "Split loop iterations to eliminate range checks") \ 2523 \ 2524 develop_pd(bool, UncommonNullCast, \ 2525 "track occurrences of null in casts; adjust compiler tactics") \ 2526 \ 2527 develop(bool, TypeProfileCasts, true, \ 2528 "treat casts like calls for purposes of type profiling") \ 2529 \ 2530 develop(bool, DelayCompilationDuringStartup, true, \ 2531 "Delay invoking the compiler until main application class is " \ 2532 "loaded") \ 2533 \ 2534 develop(bool, CompileTheWorld, false, \ 2535 "Compile all methods in all classes in bootstrap class path " \ 2536 "(stress test)") \ 2537 \ 2538 develop(bool, CompileTheWorldPreloadClasses, true, \ 2539 "Preload all classes used by a class before start loading") \ 2540 \ 2541 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2542 "Force a safepoint every n compiles so sweeper can keep up") \ 2543 \ 2544 develop(bool, FillDelaySlots, true, \ 2545 "Fill delay slots (on SPARC only)") \ 2546 \ 2547 develop(bool, TimeLivenessAnalysis, false, \ 2548 "Time computation of bytecode liveness analysis") \ 2549 \ 2550 develop(bool, TraceLivenessGen, false, \ 2551 "Trace the generation of liveness analysis information") \ 2552 \ 2553 notproduct(bool, TraceLivenessQuery, false, \ 2554 "Trace queries of liveness analysis information") \ 2555 \ 2556 notproduct(bool, CollectIndexSetStatistics, false, \ 2557 "Collect information about IndexSets") \ 2558 \ 2559 develop(bool, UseLoopSafepoints, true, \ 2560 "Generate Safepoint nodes in every loop") \ 2561 \ 2562 develop(intx, FastAllocateSizeLimit, 128*K, \ 2563 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2564 "Inline allocations larger than this in doublewords must go slow")\ 2565 \ 2566 product(bool, AggressiveOpts, false, \ 2567 "Enable aggressive optimizations - see arguments.cpp") \ 2568 \ 2569 product(bool, UseStringCache, false, \ 2570 "Enable String cache capabilities on String.java") \ 2571 \ 2572 /* statistics */ \ 2573 develop(bool, CountCompiledCalls, false, \ 2574 "counts method invocations") \ 2575 \ 2576 notproduct(bool, CountRuntimeCalls, false, \ 2577 "counts VM runtime calls") \ 2578 \ 2579 develop(bool, CountJNICalls, false, \ 2580 "counts jni method invocations") \ 2581 \ 2582 notproduct(bool, CountJVMCalls, false, \ 2583 "counts jvm method invocations") \ 2584 \ 2585 notproduct(bool, CountRemovableExceptions, false, \ 2586 "count exceptions that could be replaced by branches due to " \ 2587 "inlining") \ 2588 \ 2589 notproduct(bool, ICMissHistogram, false, \ 2590 "produce histogram of IC misses") \ 2591 \ 2592 notproduct(bool, PrintClassStatistics, false, \ 2593 "prints class statistics at end of run") \ 2594 \ 2595 notproduct(bool, PrintMethodStatistics, false, \ 2596 "prints method statistics at end of run") \ 2597 \ 2598 /* interpreter */ \ 2599 develop(bool, ClearInterpreterLocals, false, \ 2600 "Always clear local variables of interpreter activations upon " \ 2601 "entry") \ 2602 \ 2603 product_pd(bool, RewriteBytecodes, \ 2604 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2605 \ 2606 product_pd(bool, RewriteFrequentPairs, \ 2607 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2608 \ 2609 diagnostic(bool, PrintInterpreter, false, \ 2610 "Prints the generated interpreter code") \ 2611 \ 2612 product(bool, UseInterpreter, true, \ 2613 "Use interpreter for non-compiled methods") \ 2614 \ 2615 develop(bool, UseFastSignatureHandlers, true, \ 2616 "Use fast signature handlers for native calls") \ 2617 \ 2618 product(bool, UseLoopCounter, true, \ 2619 "Increment invocation counter on backward branch") \ 2620 \ 2621 product(bool, UseFastEmptyMethods, true, \ 2622 "Use fast method entry code for empty methods") \ 2623 \ 2624 product(bool, UseFastAccessorMethods, true, \ 2625 "Use fast method entry code for accessor methods") \ 2626 \ 2627 product_pd(bool, UseOnStackReplacement, \ 2628 "Use on stack replacement, calls runtime if invoc. counter " \ 2629 "overflows in loop") \ 2630 \ 2631 notproduct(bool, TraceOnStackReplacement, false, \ 2632 "Trace on stack replacement") \ 2633 \ 2634 product_pd(bool, PreferInterpreterNativeStubs, \ 2635 "Use always interpreter stubs for native methods invoked via " \ 2636 "interpreter") \ 2637 \ 2638 develop(bool, CountBytecodes, false, \ 2639 "Count number of bytecodes executed") \ 2640 \ 2641 develop(bool, PrintBytecodeHistogram, false, \ 2642 "Print histogram of the executed bytecodes") \ 2643 \ 2644 develop(bool, PrintBytecodePairHistogram, false, \ 2645 "Print histogram of the executed bytecode pairs") \ 2646 \ 2647 diagnostic(bool, PrintSignatureHandlers, false, \ 2648 "Print code generated for native method signature handlers") \ 2649 \ 2650 develop(bool, VerifyOops, false, \ 2651 "Do plausibility checks for oops") \ 2652 \ 2653 develop(bool, CheckUnhandledOops, false, \ 2654 "Check for unhandled oops in VM code") \ 2655 \ 2656 develop(bool, VerifyJNIFields, trueInDebug, \ 2657 "Verify jfieldIDs for instance fields") \ 2658 \ 2659 notproduct(bool, VerifyJNIEnvThread, false, \ 2660 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2661 "from JNI") \ 2662 \ 2663 develop(bool, VerifyFPU, false, \ 2664 "Verify FPU state (check for NaN's, etc.)") \ 2665 \ 2666 develop(bool, VerifyThread, false, \ 2667 "Watch the thread register for corruption (SPARC only)") \ 2668 \ 2669 develop(bool, VerifyActivationFrameSize, false, \ 2670 "Verify that activation frame didn't become smaller than its " \ 2671 "minimal size") \ 2672 \ 2673 develop(bool, TraceFrequencyInlining, false, \ 2674 "Trace frequency based inlining") \ 2675 \ 2676 develop_pd(bool, InlineIntrinsics, \ 2677 "Inline intrinsics that can be statically resolved") \ 2678 \ 2679 product_pd(bool, ProfileInterpreter, \ 2680 "Profile at the bytecode level during interpretation") \ 2681 \ 2682 develop_pd(bool, ProfileTraps, \ 2683 "Profile deoptimization traps at the bytecode level") \ 2684 \ 2685 product(intx, ProfileMaturityPercentage, 20, \ 2686 "number of method invocations/branches (expressed as % of " \ 2687 "CompileThreshold) before using the method's profile") \ 2688 \ 2689 develop(bool, PrintMethodData, false, \ 2690 "Print the results of +ProfileInterpreter at end of run") \ 2691 \ 2692 develop(bool, VerifyDataPointer, trueInDebug, \ 2693 "Verify the method data pointer during interpreter profiling") \ 2694 \ 2695 develop(bool, VerifyCompiledCode, false, \ 2696 "Include miscellaneous runtime verifications in nmethod code; " \ 2697 "default off because it disturbs nmethod size heuristics") \ 2698 \ 2699 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2700 "Manually make GC thread crash then dump java stack trace; " \ 2701 "Test only") \ 2702 \ 2703 /* compilation */ \ 2704 product(bool, UseCompiler, true, \ 2705 "use compilation") \ 2706 \ 2707 develop(bool, TraceCompilationPolicy, false, \ 2708 "Trace compilation policy") \ 2709 \ 2710 develop(bool, TimeCompilationPolicy, false, \ 2711 "Time the compilation policy") \ 2712 \ 2713 product(bool, UseCounterDecay, true, \ 2714 "adjust recompilation counters") \ 2715 \ 2716 develop(intx, CounterHalfLifeTime, 30, \ 2717 "half-life time of invocation counters (in secs)") \ 2718 \ 2719 develop(intx, CounterDecayMinIntervalLength, 500, \ 2720 "Min. ms. between invocation of CounterDecay") \ 2721 \ 2722 product(bool, AlwaysCompileLoopMethods, false, \ 2723 "when using recompilation, never interpret methods " \ 2724 "containing loops") \ 2725 \ 2726 product(bool, DontCompileHugeMethods, true, \ 2727 "don't compile methods > HugeMethodLimit") \ 2728 \ 2729 /* Bytecode escape analysis estimation. */ \ 2730 product(bool, EstimateArgEscape, true, \ 2731 "Analyze bytecodes to estimate escape state of arguments") \ 2732 \ 2733 product(intx, BCEATraceLevel, 0, \ 2734 "How much tracing to do of bytecode escape analysis estimates") \ 2735 \ 2736 product(intx, MaxBCEAEstimateLevel, 5, \ 2737 "Maximum number of nested calls that are analyzed by BC EA.") \ 2738 \ 2739 product(intx, MaxBCEAEstimateSize, 150, \ 2740 "Maximum bytecode size of a method to be analyzed by BC EA.") \ 2741 \ 2742 product(intx, AllocatePrefetchStyle, 1, \ 2743 "0 = no prefetch, " \ 2744 "1 = prefetch instructions for each allocation, " \ 2745 "2 = use TLAB watermark to gate allocation prefetch, " \ 2746 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2747 \ 2748 product(intx, AllocatePrefetchDistance, -1, \ 2749 "Distance to prefetch ahead of allocation pointer") \ 2750 \ 2751 product(intx, AllocatePrefetchLines, 3, \ 2752 "Number of lines to prefetch ahead of array allocation pointer") \ 2753 \ 2754 product(intx, AllocateInstancePrefetchLines, 1, \ 2755 "Number of lines to prefetch ahead of instance allocation pointer") \ 2756 \ 2757 product(intx, AllocatePrefetchStepSize, 16, \ 2758 "Step size in bytes of sequential prefetch instructions") \ 2759 \ 2760 product(intx, AllocatePrefetchInstr, 0, \ 2761 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2762 \ 2763 /* deoptimization */ \ 2764 develop(bool, TraceDeoptimization, false, \ 2765 "Trace deoptimization") \ 2766 \ 2767 develop(bool, DebugDeoptimization, false, \ 2768 "Tracing various information while debugging deoptimization") \ 2769 \ 2770 product(intx, SelfDestructTimer, 0, \ 2771 "Will cause VM to terminate after a given time (in minutes) " \ 2772 "(0 means off)") \ 2773 \ 2774 product(intx, MaxJavaStackTraceDepth, 1024, \ 2775 "Max. no. of lines in the stack trace for Java exceptions " \ 2776 "(0 means all)") \ 2777 \ 2778 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2779 "Guarantee a safepoint (at least) every so many milliseconds " \ 2780 "(0 means none)")) \ 2781 \ 2782 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2783 "Guarantee a safepoint (at least) every so many milliseconds " \ 2784 "(0 means none)")) \ 2785 \ 2786 product(intx, SafepointTimeoutDelay, 10000, \ 2787 "Delay in milliseconds for option SafepointTimeout") \ 2788 \ 2789 product(intx, NmethodSweepFraction, 16, \ 2790 "Number of invocations of sweeper to cover all nmethods") \ 2791 \ 2792 product(intx, NmethodSweepCheckInterval, 5, \ 2793 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2794 \ 2795 notproduct(bool, LogSweeper, false, \ 2796 "Keep a ring buffer of sweeper activity") \ 2797 \ 2798 notproduct(intx, SweeperLogEntries, 1024, \ 2799 "Number of records in the ring buffer of sweeper activity") \ 2800 \ 2801 notproduct(intx, MemProfilingInterval, 500, \ 2802 "Time between each invocation of the MemProfiler") \ 2803 \ 2804 develop(intx, MallocCatchPtr, -1, \ 2805 "Hit breakpoint when mallocing/freeing this pointer") \ 2806 \ 2807 notproduct(intx, AssertRepeat, 1, \ 2808 "number of times to evaluate expression in assert " \ 2809 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2810 \ 2811 notproduct(ccstrlist, SuppressErrorAt, "", \ 2812 "List of assertions (file:line) to muzzle") \ 2813 \ 2814 notproduct(uintx, HandleAllocationLimit, 1024, \ 2815 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2816 "is used") \ 2817 \ 2818 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2819 "Threshold for total handle allocation when " \ 2820 "+TraceHandleAllocation is used") \ 2821 \ 2822 develop(intx, StackPrintLimit, 100, \ 2823 "number of stack frames to print in VM-level stack dump") \ 2824 \ 2825 notproduct(intx, MaxElementPrintSize, 256, \ 2826 "maximum number of elements to print") \ 2827 \ 2828 notproduct(intx, MaxSubklassPrintSize, 4, \ 2829 "maximum number of subklasses to print when printing klass") \ 2830 \ 2831 product(intx, MaxInlineLevel, 9, \ 2832 "maximum number of nested calls that are inlined") \ 2833 \ 2834 product(intx, MaxRecursiveInlineLevel, 1, \ 2835 "maximum number of nested recursive calls that are inlined") \ 2836 \ 2837 product_pd(intx, InlineSmallCode, \ 2838 "Only inline already compiled methods if their code size is " \ 2839 "less than this") \ 2840 \ 2841 product(intx, MaxInlineSize, 35, \ 2842 "maximum bytecode size of a method to be inlined") \ 2843 \ 2844 product_pd(intx, FreqInlineSize, \ 2845 "maximum bytecode size of a frequent method to be inlined") \ 2846 \ 2847 product(intx, MaxTrivialSize, 6, \ 2848 "maximum bytecode size of a trivial method to be inlined") \ 2849 \ 2850 product(intx, MinInliningThreshold, 250, \ 2851 "min. invocation count a method needs to have to be inlined") \ 2852 \ 2853 develop(intx, MethodHistogramCutoff, 100, \ 2854 "cutoff value for method invoc. histogram (+CountCalls)") \ 2855 \ 2856 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 2857 "# of interpreted methods to show in profile") \ 2858 \ 2859 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 2860 "# of compiled methods to show in profile") \ 2861 \ 2862 develop(intx, ProfilerNumberOfStubMethods, 25, \ 2863 "# of stub methods to show in profile") \ 2864 \ 2865 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 2866 "# of runtime stub nodes to show in profile") \ 2867 \ 2868 product(intx, ProfileIntervalsTicks, 100, \ 2869 "# of ticks between printing of interval profile " \ 2870 "(+ProfileIntervals)") \ 2871 \ 2872 notproduct(intx, ScavengeALotInterval, 1, \ 2873 "Interval between which scavenge will occur with +ScavengeALot") \ 2874 \ 2875 notproduct(intx, FullGCALotInterval, 1, \ 2876 "Interval between which full gc will occur with +FullGCALot") \ 2877 \ 2878 notproduct(intx, FullGCALotStart, 0, \ 2879 "For which invocation to start FullGCAlot") \ 2880 \ 2881 notproduct(intx, FullGCALotDummies, 32*K, \ 2882 "Dummy object allocated with +FullGCALot, forcing all objects " \ 2883 "to move") \ 2884 \ 2885 develop(intx, DontYieldALotInterval, 10, \ 2886 "Interval between which yields will be dropped (milliseconds)") \ 2887 \ 2888 develop(intx, MinSleepInterval, 1, \ 2889 "Minimum sleep() interval (milliseconds) when " \ 2890 "ConvertSleepToYield is off (used for SOLARIS)") \ 2891 \ 2892 develop(intx, ProfilerPCTickThreshold, 15, \ 2893 "Number of ticks in a PC buckets to be a hotspot") \ 2894 \ 2895 notproduct(intx, DeoptimizeALotInterval, 5, \ 2896 "Number of exits until DeoptimizeALot kicks in") \ 2897 \ 2898 notproduct(intx, ZombieALotInterval, 5, \ 2899 "Number of exits until ZombieALot kicks in") \ 2900 \ 2901 develop(bool, StressNonEntrant, false, \ 2902 "Mark nmethods non-entrant at registration") \ 2903 \ 2904 diagnostic(intx, MallocVerifyInterval, 0, \ 2905 "if non-zero, verify C heap after every N calls to " \ 2906 "malloc/realloc/free") \ 2907 \ 2908 diagnostic(intx, MallocVerifyStart, 0, \ 2909 "if non-zero, start verifying C heap after Nth call to " \ 2910 "malloc/realloc/free") \ 2911 \ 2912 product(intx, TypeProfileWidth, 2, \ 2913 "number of receiver types to record in call/cast profile") \ 2914 \ 2915 develop(intx, BciProfileWidth, 2, \ 2916 "number of return bci's to record in ret profile") \ 2917 \ 2918 product(intx, PerMethodRecompilationCutoff, 400, \ 2919 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 2920 \ 2921 product(intx, PerBytecodeRecompilationCutoff, 200, \ 2922 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 2923 \ 2924 product(intx, PerMethodTrapLimit, 100, \ 2925 "Limit on traps (of one kind) in a method (includes inlines)") \ 2926 \ 2927 product(intx, PerBytecodeTrapLimit, 4, \ 2928 "Limit on traps (of one kind) at a particular BCI") \ 2929 \ 2930 develop(intx, InlineFrequencyRatio, 20, \ 2931 "Ratio of call site execution to caller method invocation") \ 2932 \ 2933 develop_pd(intx, InlineFrequencyCount, \ 2934 "Count of call site execution necessary to trigger frequent " \ 2935 "inlining") \ 2936 \ 2937 develop(intx, InlineThrowCount, 50, \ 2938 "Force inlining of interpreted methods that throw this often") \ 2939 \ 2940 develop(intx, InlineThrowMaxSize, 200, \ 2941 "Force inlining of throwing methods smaller than this") \ 2942 \ 2943 develop(intx, ProfilerNodeSize, 1024, \ 2944 "Size in K to allocate for the Profile Nodes of each thread") \ 2945 \ 2946 product_pd(intx, PreInflateSpin, \ 2947 "Number of times to spin wait before inflation") \ 2948 \ 2949 /* gc parameters */ \ 2950 product(uintx, InitialHeapSize, 0, \ 2951 "Initial heap size (in bytes); zero means OldSize + NewSize") \ 2952 \ 2953 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 2954 "Maximum heap size (in bytes)") \ 2955 \ 2956 product(uintx, OldSize, ScaleForWordSize(4*M), \ 2957 "Initial tenured generation size (in bytes)") \ 2958 \ 2959 product(uintx, NewSize, ScaleForWordSize(1*M), \ 2960 "Initial new generation size (in bytes)") \ 2961 \ 2962 product(uintx, MaxNewSize, max_uintx, \ 2963 "Maximum new generation size (in bytes), max_uintx means set " \ 2964 "ergonomically") \ 2965 \ 2966 product(uintx, PretenureSizeThreshold, 0, \ 2967 "Maximum size in bytes of objects allocated in DefNew " \ 2968 "generation; zero means no maximum") \ 2969 \ 2970 product(uintx, TLABSize, 0, \ 2971 "Starting TLAB size (in bytes); zero means set ergonomically") \ 2972 \ 2973 product(uintx, MinTLABSize, 2*K, \ 2974 "Minimum allowed TLAB size (in bytes)") \ 2975 \ 2976 product(uintx, TLABAllocationWeight, 35, \ 2977 "Allocation averaging weight") \ 2978 \ 2979 product(uintx, TLABWasteTargetPercent, 1, \ 2980 "Percentage of Eden that can be wasted") \ 2981 \ 2982 product(uintx, TLABRefillWasteFraction, 64, \ 2983 "Max TLAB waste at a refill (internal fragmentation)") \ 2984 \ 2985 product(uintx, TLABWasteIncrement, 4, \ 2986 "Increment allowed waste at slow allocation") \ 2987 \ 2988 product(uintx, SurvivorRatio, 8, \ 2989 "Ratio of eden/survivor space size") \ 2990 \ 2991 product(uintx, NewRatio, 2, \ 2992 "Ratio of new/old generation sizes") \ 2993 \ 2994 product_pd(uintx, NewSizeThreadIncrease, \ 2995 "Additional size added to desired new generation size per " \ 2996 "non-daemon thread (in bytes)") \ 2997 \ 2998 product_pd(uintx, MetaspaceSize, \ 2999 "Initial size of Metaspaces (in bytes)") \ 3000 \ 3001 product(uintx, MaxMetaspaceSize, max_uintx, \ 3002 "Maximum size of Metaspaces (in bytes)") \ 3003 \ 3004 product(uintx, ClassMetaspaceSize, 2*M, \ 3005 "Maximum size of InstanceKlass area in Metaspace used for " \ 3006 "UseCompressedKlassPointers") \ 3007 \ 3008 product(uintx, MinHeapFreeRatio, 40, \ 3009 "Min percentage of heap free after GC to avoid expansion") \ 3010 \ 3011 product(uintx, MaxHeapFreeRatio, 70, \ 3012 "Max percentage of heap free after GC to avoid shrinking") \ 3013 \ 3014 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3015 "Number of milliseconds per MB of free space in the heap") \ 3016 \ 3017 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3018 "Min change in heap space due to GC (in bytes)") \ 3019 \ 3020 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3021 "Min expansion of Metaspace (in bytes)") \ 3022 \ 3023 product(uintx, MinMetaspaceFreeRatio, 40, \ 3024 "Min percentage of Metaspace free after GC to avoid expansion") \ 3025 \ 3026 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3027 "Max percentage of Metaspace free after GC to avoid shrinking") \ 3028 \ 3029 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3030 "Max expansion of Metaspace without full GC (in bytes)") \ 3031 \ 3032 product(intx, QueuedAllocationWarningCount, 0, \ 3033 "Number of times an allocation that queues behind a GC " \ 3034 "will retry before printing a warning") \ 3035 \ 3036 diagnostic(uintx, VerifyGCStartAt, 0, \ 3037 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3038 \ 3039 diagnostic(intx, VerifyGCLevel, 0, \ 3040 "Generation level at which to start +VerifyBefore/AfterGC") \ 3041 \ 3042 product(uintx, MaxTenuringThreshold, 15, \ 3043 "Maximum value for tenuring threshold") \ 3044 \ 3045 product(uintx, InitialTenuringThreshold, 7, \ 3046 "Initial value for tenuring threshold") \ 3047 \ 3048 product(uintx, TargetSurvivorRatio, 50, \ 3049 "Desired percentage of survivor space used after scavenge") \ 3050 \ 3051 product(uintx, MarkSweepDeadRatio, 5, \ 3052 "Percentage (0-100) of the old gen allowed as dead wood." \ 3053 "Serial mark sweep treats this as both the min and max value." \ 3054 "CMS uses this value only if it falls back to mark sweep." \ 3055 "Par compact uses a variable scale based on the density of the" \ 3056 "generation and treats this as the max value when the heap is" \ 3057 "either completely full or completely empty. Par compact also" \ 3058 "has a smaller default value; see arguments.cpp.") \ 3059 \ 3060 product(intx, MarkSweepAlwaysCompactCount, 4, \ 3061 "How often should we fully compact the heap (ignoring the dead " \ 3062 "space parameters)") \ 3063 \ 3064 product(intx, PrintCMSStatistics, 0, \ 3065 "Statistics for CMS") \ 3066 \ 3067 product(bool, PrintCMSInitiationStatistics, false, \ 3068 "Statistics for initiating a CMS collection") \ 3069 \ 3070 product(intx, PrintFLSStatistics, 0, \ 3071 "Statistics for CMS' FreeListSpace") \ 3072 \ 3073 product(intx, PrintFLSCensus, 0, \ 3074 "Census for CMS' FreeListSpace") \ 3075 \ 3076 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3077 "Delay in ms between expansion and allocation") \ 3078 \ 3079 develop(uintx, GCWorkerDelayMillis, 0, \ 3080 "Delay in ms in scheduling GC workers") \ 3081 \ 3082 product(intx, DeferThrSuspendLoopCount, 4000, \ 3083 "(Unstable) Number of times to iterate in safepoint loop " \ 3084 " before blocking VM threads ") \ 3085 \ 3086 product(intx, DeferPollingPageLoopCount, -1, \ 3087 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3088 "before changing safepoint polling page to RO ") \ 3089 \ 3090 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3091 \ 3092 product(bool, PSChunkLargeArrays, true, \ 3093 "true: process large arrays in chunks") \ 3094 \ 3095 product(uintx, GCDrainStackTargetSize, 64, \ 3096 "how many entries we'll try to leave on the stack during " \ 3097 "parallel GC") \ 3098 \ 3099 /* stack parameters */ \ 3100 product_pd(intx, StackYellowPages, \ 3101 "Number of yellow zone (recoverable overflows) pages") \ 3102 \ 3103 product_pd(intx, StackRedPages, \ 3104 "Number of red zone (unrecoverable overflows) pages") \ 3105 \ 3106 product_pd(intx, StackShadowPages, \ 3107 "Number of shadow zone (for overflow checking) pages" \ 3108 " this should exceed the depth of the VM and native call stack") \ 3109 \ 3110 product_pd(intx, ThreadStackSize, \ 3111 "Thread Stack Size (in Kbytes)") \ 3112 \ 3113 product_pd(intx, VMThreadStackSize, \ 3114 "Non-Java Thread Stack Size (in Kbytes)") \ 3115 \ 3116 product_pd(intx, CompilerThreadStackSize, \ 3117 "Compiler Thread Stack Size (in Kbytes)") \ 3118 \ 3119 develop_pd(uintx, JVMInvokeMethodSlack, \ 3120 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3121 \ 3122 product(uintx, ThreadSafetyMargin, 50*M, \ 3123 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3124 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3125 "disable this feature") \ 3126 \ 3127 /* code cache parameters */ \ 3128 develop(uintx, CodeCacheSegmentSize, 64, \ 3129 "Code cache segment size (in bytes) - smallest unit of " \ 3130 "allocation") \ 3131 \ 3132 develop_pd(intx, CodeEntryAlignment, \ 3133 "Code entry alignment for generated code (in bytes)") \ 3134 \ 3135 product_pd(intx, OptoLoopAlignment, \ 3136 "Align inner loops to zero relative to this modulus") \ 3137 \ 3138 product_pd(uintx, InitialCodeCacheSize, \ 3139 "Initial code cache size (in bytes)") \ 3140 \ 3141 product_pd(uintx, ReservedCodeCacheSize, \ 3142 "Reserved code cache size (in bytes) - maximum code cache size") \ 3143 \ 3144 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3145 "When less than X space left, we stop compiling.") \ 3146 \ 3147 product_pd(uintx, CodeCacheExpansionSize, \ 3148 "Code cache expansion size (in bytes)") \ 3149 \ 3150 develop_pd(uintx, CodeCacheMinBlockLength, \ 3151 "Minimum number of segments in a code cache block.") \ 3152 \ 3153 notproduct(bool, ExitOnFullCodeCache, false, \ 3154 "Exit the VM if we fill the code cache.") \ 3155 \ 3156 product(bool, UseCodeCacheFlushing, true, \ 3157 "Attempt to clean the code cache before shutting off compiler") \ 3158 \ 3159 product(intx, MinCodeCacheFlushingInterval, 30, \ 3160 "Min number of seconds between code cache cleaning sessions") \ 3161 \ 3162 product(uintx, CodeCacheFlushingMinimumFreeSpace, 1500*K, \ 3163 "When less than X space left, start code cache cleaning") \ 3164 \ 3165 /* interpreter debugging */ \ 3166 develop(intx, BinarySwitchThreshold, 5, \ 3167 "Minimal number of lookupswitch entries for rewriting to binary " \ 3168 "switch") \ 3169 \ 3170 develop(intx, StopInterpreterAt, 0, \ 3171 "Stops interpreter execution at specified bytecode number") \ 3172 \ 3173 develop(intx, TraceBytecodesAt, 0, \ 3174 "Traces bytecodes starting with specified bytecode number") \ 3175 \ 3176 /* compiler interface */ \ 3177 develop(intx, CIStart, 0, \ 3178 "the id of the first compilation to permit") \ 3179 \ 3180 develop(intx, CIStop, -1, \ 3181 "the id of the last compilation to permit") \ 3182 \ 3183 develop(intx, CIStartOSR, 0, \ 3184 "the id of the first osr compilation to permit " \ 3185 "(CICountOSR must be on)") \ 3186 \ 3187 develop(intx, CIStopOSR, -1, \ 3188 "the id of the last osr compilation to permit " \ 3189 "(CICountOSR must be on)") \ 3190 \ 3191 develop(intx, CIBreakAtOSR, -1, \ 3192 "id of osr compilation to break at") \ 3193 \ 3194 develop(intx, CIBreakAt, -1, \ 3195 "id of compilation to break at") \ 3196 \ 3197 product(ccstrlist, CompileOnly, "", \ 3198 "List of methods (pkg/class.name) to restrict compilation to") \ 3199 \ 3200 product(ccstr, CompileCommandFile, NULL, \ 3201 "Read compiler commands from this file [.hotspot_compiler]") \ 3202 \ 3203 product(ccstrlist, CompileCommand, "", \ 3204 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3205 \ 3206 develop(bool, ReplayCompiles, false, \ 3207 "Enable replay of compilations from ReplayDataFile") \ 3208 \ 3209 develop(ccstr, ReplayDataFile, "replay.txt", \ 3210 "file containing compilation replay information") \ 3211 \ 3212 develop(intx, ReplaySuppressInitializers, 2, \ 3213 "Controls handling of class initialization during replay" \ 3214 "0 - don't do anything special" \ 3215 "1 - treat all class initializers as empty" \ 3216 "2 - treat class initializers for application classes as empty" \ 3217 "3 - allow all class initializers to run during bootstrap but" \ 3218 " pretend they are empty after starting replay") \ 3219 \ 3220 develop(bool, ReplayIgnoreInitErrors, false, \ 3221 "Ignore exceptions thrown during initialization for replay") \ 3222 \ 3223 develop(bool, DumpReplayDataOnError, true, \ 3224 "record replay data for crashing compiler threads") \ 3225 \ 3226 product(bool, CICompilerCountPerCPU, false, \ 3227 "1 compiler thread for log(N CPUs)") \ 3228 \ 3229 develop(intx, CIFireOOMAt, -1, \ 3230 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3231 "(non-negative value throws OOM after this many CI accesses " \ 3232 "in each compile)") \ 3233 \ 3234 notproduct(bool, CIObjectFactoryVerify, false, \ 3235 "enable potentially expensive verification in ciObjectFactory") \ 3236 \ 3237 /* Priorities */ \ 3238 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3239 \ 3240 product(intx, ThreadPriorityPolicy, 0, \ 3241 "0 : Normal. "\ 3242 " VM chooses priorities that are appropriate for normal "\ 3243 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3244 " to normal native priority. Java priorities below NORM_PRIORITY"\ 3245 " map to lower native priority values. On Windows applications"\ 3246 " are allowed to use higher native priorities. However, with "\ 3247 " ThreadPriorityPolicy=0, VM will not use the highest possible"\ 3248 " native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may "\ 3249 " interfere with system threads. On Linux thread priorities "\ 3250 " are ignored because the OS does not support static priority "\ 3251 " in SCHED_OTHER scheduling class which is the only choice for"\ 3252 " non-root, non-realtime applications. "\ 3253 "1 : Aggressive. "\ 3254 " Java thread priorities map over to the entire range of "\ 3255 " native thread priorities. Higher Java thread priorities map "\ 3256 " to higher native thread priorities. This policy should be "\ 3257 " used with care, as sometimes it can cause performance "\ 3258 " degradation in the application and/or the entire system. On "\ 3259 " Linux this policy requires root privilege.") \ 3260 \ 3261 product(bool, ThreadPriorityVerbose, false, \ 3262 "Print priority changes") \ 3263 \ 3264 product(intx, DefaultThreadPriority, -1, \ 3265 "The native priority at which threads run if not elsewhere " \ 3266 "specified (-1 means no change)") \ 3267 \ 3268 product(intx, CompilerThreadPriority, -1, \ 3269 "The native priority at which compiler threads should run " \ 3270 "(-1 means no change)") \ 3271 \ 3272 product(intx, VMThreadPriority, -1, \ 3273 "The native priority at which the VM thread should run " \ 3274 "(-1 means no change)") \ 3275 \ 3276 product(bool, CompilerThreadHintNoPreempt, true, \ 3277 "(Solaris only) Give compiler threads an extra quanta") \ 3278 \ 3279 product(bool, VMThreadHintNoPreempt, false, \ 3280 "(Solaris only) Give VM thread an extra quanta") \ 3281 \ 3282 product(intx, JavaPriority1_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3283 product(intx, JavaPriority2_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3284 product(intx, JavaPriority3_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3285 product(intx, JavaPriority4_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3286 product(intx, JavaPriority5_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3287 product(intx, JavaPriority6_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3288 product(intx, JavaPriority7_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3289 product(intx, JavaPriority8_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3290 product(intx, JavaPriority9_To_OSPriority, -1, "Map Java priorities to OS priorities") \ 3291 product(intx, JavaPriority10_To_OSPriority,-1, "Map Java priorities to OS priorities") \ 3292 \ 3293 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3294 "Java thread priority 10 maps to critical scheduling priority") \ 3295 \ 3296 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3297 "Compiler thread(s) run at critical scheduling priority") \ 3298 \ 3299 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3300 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3301 \ 3302 /* compiler debugging */ \ 3303 notproduct(intx, CompileTheWorldStartAt, 1, \ 3304 "First class to consider when using +CompileTheWorld") \ 3305 \ 3306 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3307 "Last class to consider when using +CompileTheWorld") \ 3308 \ 3309 develop(intx, NewCodeParameter, 0, \ 3310 "Testing Only: Create a dedicated integer parameter before " \ 3311 "putback") \ 3312 \ 3313 /* new oopmap storage allocation */ \ 3314 develop(intx, MinOopMapAllocation, 8, \ 3315 "Minimum number of OopMap entries in an OopMapSet") \ 3316 \ 3317 /* Background Compilation */ \ 3318 develop(intx, LongCompileThreshold, 50, \ 3319 "Used with +TraceLongCompiles") \ 3320 \ 3321 product(intx, StarvationMonitorInterval, 200, \ 3322 "Pause between each check in ms") \ 3323 \ 3324 /* recompilation */ \ 3325 product_pd(intx, CompileThreshold, \ 3326 "number of interpreted method invocations before (re-)compiling") \ 3327 \ 3328 product_pd(intx, BackEdgeThreshold, \ 3329 "Interpreter Back edge threshold at which an OSR compilation is invoked")\ 3330 \ 3331 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3332 "Interpreter (tier 0) invocation notification frequency.") \ 3333 \ 3334 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3335 "C1 without MDO (tier 2) invocation notification frequency.") \ 3336 \ 3337 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3338 "C1 with MDO profiling (tier 3) invocation notification " \ 3339 "frequency.") \ 3340 \ 3341 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3342 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3343 \ 3344 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3345 "Interpreter (tier 0) invocation notification frequency.") \ 3346 \ 3347 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3348 "C1 without MDO (tier 2) invocation notification frequency.") \ 3349 \ 3350 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3351 "C1 with MDO profiling (tier 3) invocation notification " \ 3352 "frequency.") \ 3353 \ 3354 product(intx, Tier2CompileThreshold, 0, \ 3355 "threshold at which tier 2 compilation is invoked") \ 3356 \ 3357 product(intx, Tier2BackEdgeThreshold, 0, \ 3358 "Back edge threshold at which tier 2 compilation is invoked") \ 3359 \ 3360 product(intx, Tier3InvocationThreshold, 200, \ 3361 "Compile if number of method invocations crosses this " \ 3362 "threshold") \ 3363 \ 3364 product(intx, Tier3MinInvocationThreshold, 100, \ 3365 "Minimum invocation to compile at tier 3") \ 3366 \ 3367 product(intx, Tier3CompileThreshold, 2000, \ 3368 "Threshold at which tier 3 compilation is invoked (invocation " \ 3369 "minimum must be satisfied.") \ 3370 \ 3371 product(intx, Tier3BackEdgeThreshold, 60000, \ 3372 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3373 \ 3374 product(intx, Tier4InvocationThreshold, 5000, \ 3375 "Compile if number of method invocations crosses this " \ 3376 "threshold") \ 3377 \ 3378 product(intx, Tier4MinInvocationThreshold, 600, \ 3379 "Minimum invocation to compile at tier 4") \ 3380 \ 3381 product(intx, Tier4CompileThreshold, 15000, \ 3382 "Threshold at which tier 4 compilation is invoked (invocation " \ 3383 "minimum must be satisfied.") \ 3384 \ 3385 product(intx, Tier4BackEdgeThreshold, 40000, \ 3386 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3387 \ 3388 product(intx, Tier3DelayOn, 5, \ 3389 "If C2 queue size grows over this amount per compiler thread " \ 3390 "stop compiling at tier 3 and start compiling at tier 2") \ 3391 \ 3392 product(intx, Tier3DelayOff, 2, \ 3393 "If C2 queue size is less than this amount per compiler thread " \ 3394 "allow methods compiled at tier 2 transition to tier 3") \ 3395 \ 3396 product(intx, Tier3LoadFeedback, 5, \ 3397 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3398 "reaches this amount per compiler thread") \ 3399 \ 3400 product(intx, Tier4LoadFeedback, 3, \ 3401 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3402 "reaches this amount per compiler thread") \ 3403 \ 3404 product(intx, TieredCompileTaskTimeout, 50, \ 3405 "Kill compile task if method was not used within " \ 3406 "given timeout in milliseconds") \ 3407 \ 3408 product(intx, TieredStopAtLevel, 4, \ 3409 "Stop at given compilation level") \ 3410 \ 3411 product(intx, Tier0ProfilingStartPercentage, 200, \ 3412 "Start profiling in interpreter if the counters exceed tier 3" \ 3413 "thresholds by the specified percentage") \ 3414 \ 3415 product(intx, TieredRateUpdateMinTime, 1, \ 3416 "Minimum rate sampling interval (in milliseconds)") \ 3417 \ 3418 product(intx, TieredRateUpdateMaxTime, 25, \ 3419 "Maximum rate sampling interval (in milliseconds)") \ 3420 \ 3421 product_pd(bool, TieredCompilation, \ 3422 "Enable tiered compilation") \ 3423 \ 3424 product(bool, PrintTieredEvents, false, \ 3425 "Print tiered events notifications") \ 3426 \ 3427 product_pd(intx, OnStackReplacePercentage, \ 3428 "NON_TIERED number of method invocations/branches (expressed as %"\ 3429 "of CompileThreshold) before (re-)compiling OSR code") \ 3430 \ 3431 product(intx, InterpreterProfilePercentage, 33, \ 3432 "NON_TIERED number of method invocations/branches (expressed as %"\ 3433 "of CompileThreshold) before profiling in the interpreter") \ 3434 \ 3435 develop(intx, MaxRecompilationSearchLength, 10, \ 3436 "max. # frames to inspect searching for recompilee") \ 3437 \ 3438 develop(intx, MaxInterpretedSearchLength, 3, \ 3439 "max. # interp. frames to skip when searching for recompilee") \ 3440 \ 3441 develop(intx, DesiredMethodLimit, 8000, \ 3442 "desired max. method size (in bytecodes) after inlining") \ 3443 \ 3444 develop(intx, HugeMethodLimit, 8000, \ 3445 "don't compile methods larger than this if " \ 3446 "+DontCompileHugeMethods") \ 3447 \ 3448 /* New JDK 1.4 reflection implementation */ \ 3449 \ 3450 develop(bool, UseNewReflection, true, \ 3451 "Temporary flag for transition to reflection based on dynamic " \ 3452 "bytecode generation in 1.4; can no longer be turned off in 1.4 " \ 3453 "JDK, and is unneeded in 1.3 JDK, but marks most places VM " \ 3454 "changes were needed") \ 3455 \ 3456 develop(bool, VerifyReflectionBytecodes, false, \ 3457 "Force verification of 1.4 reflection bytecodes. Does not work " \ 3458 "in situations like that described in 4486457 or for " \ 3459 "constructors generated for serialization, so can not be enabled "\ 3460 "in product.") \ 3461 \ 3462 product(bool, ReflectionWrapResolutionErrors, true, \ 3463 "Temporary flag for transition to AbstractMethodError wrapped " \ 3464 "in InvocationTargetException. See 6531596") \ 3465 \ 3466 \ 3467 develop(intx, FastSuperclassLimit, 8, \ 3468 "Depth of hardwired instanceof accelerator array") \ 3469 \ 3470 /* Properties for Java libraries */ \ 3471 \ 3472 product(uintx, MaxDirectMemorySize, 0, \ 3473 "Maximum total size of NIO direct-buffer allocations") \ 3474 \ 3475 /* temporary developer defined flags */ \ 3476 \ 3477 diagnostic(bool, UseNewCode, false, \ 3478 "Testing Only: Use the new version while testing") \ 3479 \ 3480 diagnostic(bool, UseNewCode2, false, \ 3481 "Testing Only: Use the new version while testing") \ 3482 \ 3483 diagnostic(bool, UseNewCode3, false, \ 3484 "Testing Only: Use the new version while testing") \ 3485 \ 3486 /* flags for performance data collection */ \ 3487 \ 3488 product(bool, UsePerfData, falseInEmbedded, \ 3489 "Flag to disable jvmstat instrumentation for performance testing" \ 3490 "and problem isolation purposes.") \ 3491 \ 3492 product(bool, PerfDataSaveToFile, false, \ 3493 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3494 \ 3495 product(ccstr, PerfDataSaveFile, NULL, \ 3496 "Save PerfData memory to the specified absolute pathname," \ 3497 "%p in the file name if present will be replaced by pid") \ 3498 \ 3499 product(intx, PerfDataSamplingInterval, 50 /*ms*/, \ 3500 "Data sampling interval in milliseconds") \ 3501 \ 3502 develop(bool, PerfTraceDataCreation, false, \ 3503 "Trace creation of Performance Data Entries") \ 3504 \ 3505 develop(bool, PerfTraceMemOps, false, \ 3506 "Trace PerfMemory create/attach/detach calls") \ 3507 \ 3508 product(bool, PerfDisableSharedMem, false, \ 3509 "Store performance data in standard memory") \ 3510 \ 3511 product(intx, PerfDataMemorySize, 32*K, \ 3512 "Size of performance data memory region. Will be rounded " \ 3513 "up to a multiple of the native os page size.") \ 3514 \ 3515 product(intx, PerfMaxStringConstLength, 1024, \ 3516 "Maximum PerfStringConstant string length before truncation") \ 3517 \ 3518 product(bool, PerfAllowAtExitRegistration, false, \ 3519 "Allow registration of atexit() methods") \ 3520 \ 3521 product(bool, PerfBypassFileSystemCheck, false, \ 3522 "Bypass Win32 file system criteria checks (Windows Only)") \ 3523 \ 3524 product(intx, UnguardOnExecutionViolation, 0, \ 3525 "Unguard page and retry on no-execute fault (Win32 only)" \ 3526 "0=off, 1=conservative, 2=aggressive") \ 3527 \ 3528 /* Serviceability Support */ \ 3529 \ 3530 product(bool, ManagementServer, false, \ 3531 "Create JMX Management Server") \ 3532 \ 3533 product(bool, DisableAttachMechanism, false, \ 3534 "Disable mechanism that allows tools to attach to this VM") \ 3535 \ 3536 product(bool, StartAttachListener, false, \ 3537 "Always start Attach Listener at VM startup") \ 3538 \ 3539 manageable(bool, PrintConcurrentLocks, false, \ 3540 "Print java.util.concurrent locks in thread dump") \ 3541 \ 3542 product(bool, TransmitErrorReport, false, \ 3543 "Enable error report transmission on erroneous termination") \ 3544 \ 3545 product(ccstr, ErrorReportServer, NULL, \ 3546 "Override built-in error report server address") \ 3547 \ 3548 /* Shared spaces */ \ 3549 \ 3550 product(bool, UseSharedSpaces, true, \ 3551 "Use shared spaces for metadata") \ 3552 \ 3553 product(bool, RequireSharedSpaces, false, \ 3554 "Require shared spaces for metadata") \ 3555 \ 3556 product(bool, DumpSharedSpaces, false, \ 3557 "Special mode: JVM reads a class list, loads classes, builds " \ 3558 "shared spaces, and dumps the shared spaces to a file to be " \ 3559 "used in future JVM runs.") \ 3560 \ 3561 product(bool, PrintSharedSpaces, false, \ 3562 "Print usage of shared spaces") \ 3563 \ 3564 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3565 "Size of read-write space for metadata (in bytes)") \ 3566 \ 3567 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3568 "Size of read-only space for metadata (in bytes)") \ 3569 \ 3570 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3571 "Size of the shared miscellaneous data area (in bytes)") \ 3572 \ 3573 product(uintx, SharedMiscCodeSize, 120*K, \ 3574 "Size of the shared miscellaneous code area (in bytes)") \ 3575 \ 3576 product(uintx, SharedDummyBlockSize, 0, \ 3577 "Size of dummy block used to shift heap addresses (in bytes)") \ 3578 \ 3579 diagnostic(bool, EnableInvokeDynamic, true, \ 3580 "support JSR 292 (method handles, invokedynamic, " \ 3581 "anonymous classes") \ 3582 \ 3583 diagnostic(bool, PrintMethodHandleStubs, false, \ 3584 "Print generated stub code for method handles") \ 3585 \ 3586 develop(bool, TraceMethodHandles, false, \ 3587 "trace internal method handle operations") \ 3588 \ 3589 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3590 "perform extra checks when constructing method handles") \ 3591 \ 3592 diagnostic(bool, ShowHiddenFrames, false, \ 3593 "show method handle implementation frames (usually hidden)") \ 3594 \ 3595 experimental(bool, TrustFinalNonStaticFields, false, \ 3596 "trust final non-static declarations for constant folding") \ 3597 \ 3598 develop(bool, TraceInvokeDynamic, false, \ 3599 "trace internal invoke dynamic operations") \ 3600 \ 3601 diagnostic(bool, PauseAtStartup, false, \ 3602 "Causes the VM to pause at startup time and wait for the pause " \ 3603 "file to be removed (default: ./vm.paused.<pid>)") \ 3604 \ 3605 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3606 "The file to create and for whose removal to await when pausing " \ 3607 "at startup. (default: ./vm.paused.<pid>)") \ 3608 \ 3609 diagnostic(bool, PauseAtExit, false, \ 3610 "Pause and wait for keypress on exit if a debugger is attached") \ 3611 \ 3612 product(bool, ExtendedDTraceProbes, false, \ 3613 "Enable performance-impacting dtrace probes") \ 3614 \ 3615 product(bool, DTraceMethodProbes, false, \ 3616 "Enable dtrace probes for method-entry and method-exit") \ 3617 \ 3618 product(bool, DTraceAllocProbes, false, \ 3619 "Enable dtrace probes for object allocation") \ 3620 \ 3621 product(bool, DTraceMonitorProbes, false, \ 3622 "Enable dtrace probes for monitor events") \ 3623 \ 3624 product(bool, RelaxAccessControlCheck, false, \ 3625 "Relax the access control checks in the verifier") \ 3626 \ 3627 diagnostic(bool, PrintDTraceDOF, false, \ 3628 "Print the DTrace DOF passed to the system for JSDT probes") \ 3629 \ 3630 product(uintx, StringTableSize, defaultStringTableSize, \ 3631 "Number of buckets in the interned String table") \ 3632 \ 3633 develop(bool, TraceDefaultMethods, false, \ 3634 "Trace the default method processing steps") \ 3635 \ 3636 develop(bool, ParseAllGenericSignatures, false, \ 3637 "Parse all generic signatures while classloading") \ 3638 \ 3639 develop(bool, VerifyGenericSignatures, false, \ 3640 "Abort VM on erroneous or inconsistent generic signatures") \ 3641 \ 3642 product(bool, UseVMInterruptibleIO, false, \ 3643 "(Unstable, Solaris-specific) Thread interrupt before or with " \ 3644 "EINTR for I/O operations results in OS_INTRPT. The default value"\ 3645 " of this flag is true for JDK 6 and earlier") \ 3646 \ 3647 diagnostic(bool, WhiteBoxAPI, false, \ 3648 "Enable internal testing APIs") \ 3649 \ 3650 product(bool, PrintGCCause, true, \ 3651 "Include GC cause in GC logging") \ 3652 \ 3653 product(bool, AllowNonVirtualCalls, false, \ 3654 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") 3655 3656/* 3657 * Macros for factoring of globals 3658 */ 3659 3660// Interface macros 3661#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3662#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3663#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3664#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3665#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3666#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3667#ifdef PRODUCT 3668#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) const type name = value; 3669#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) const type name = pd_##name; 3670#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) 3671#else 3672#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3673#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3674#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3675#endif 3676// Special LP64 flags, product only needed for now. 3677#ifdef _LP64 3678#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3679#else 3680#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3681#endif // _LP64 3682 3683// Implementation macros 3684#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3685#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3686#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3687#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3688#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3689#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3690#ifdef PRODUCT 3691#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) /* flag name is constant */ 3692#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) /* flag name is constant */ 3693#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) 3694#else 3695#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3696#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3697#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3698#endif 3699#ifdef _LP64 3700#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3701#else 3702#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3703#endif // _LP64 3704 3705RUNTIME_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) 3706 3707RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3708 3709ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3710 3711// Extensions 3712 3713#include "runtime/globals_ext.hpp" 3714 3715#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3716