globals.hpp revision 6857:4750cc1f4306
14Srgrimes/* 24Srgrimes * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved. 34Srgrimes * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 44Srgrimes * 54Srgrimes * This code is free software; you can redistribute it and/or modify it 64Srgrimes * under the terms of the GNU General Public License version 2 only, as 74Srgrimes * published by the Free Software Foundation. 84Srgrimes * 94Srgrimes * This code is distributed in the hope that it will be useful, but WITHOUT 104Srgrimes * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 114Srgrimes * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 124Srgrimes * version 2 for more details (a copy is included in the LICENSE file that 134Srgrimes * accompanied this code). 144Srgrimes * 154Srgrimes * You should have received a copy of the GNU General Public License version 164Srgrimes * 2 along with this work; if not, write to the Free Software Foundation, 174Srgrimes * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 184Srgrimes * 194Srgrimes * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 204Srgrimes * or visit www.oracle.com if you need additional information or have any 214Srgrimes * questions. 224Srgrimes * 234Srgrimes */ 244Srgrimes 254Srgrimes#ifndef SHARE_VM_RUNTIME_GLOBALS_HPP 264Srgrimes#define SHARE_VM_RUNTIME_GLOBALS_HPP 274Srgrimes 284Srgrimes#include "utilities/debug.hpp" 294Srgrimes 304Srgrimes// use this for flags that are true per default in the tiered build 314Srgrimes// but false in non-tiered builds, and vice versa 324Srgrimes#ifdef TIERED 334Srgrimes#define trueInTiered true 344Srgrimes#define falseInTiered false 354Srgrimes#else 36556Srgrimes#define trueInTiered false 373861Sbde#define falseInTiered true 384Srgrimes#endif 394Srgrimes 404Srgrimes#ifdef TARGET_ARCH_x86 41757Sdg# include "globals_x86.hpp" 42757Sdg#endif 43757Sdg#ifdef TARGET_ARCH_sparc 44757Sdg# include "globals_sparc.hpp" 45757Sdg#endif 464Srgrimes#ifdef TARGET_ARCH_zero 474Srgrimes# include "globals_zero.hpp" 482056Swollman#endif 492056Swollman#ifdef TARGET_ARCH_arm 502056Swollman# include "globals_arm.hpp" 512056Swollman#endif 522056Swollman#ifdef TARGET_ARCH_ppc 532056Swollman# include "globals_ppc.hpp" 542056Swollman#endif 552056Swollman#ifdef TARGET_OS_FAMILY_linux 563489Sphk# include "globals_linux.hpp" 573489Sphk#endif 583258Sdg#ifdef TARGET_OS_FAMILY_solaris 593258Sdg# include "globals_solaris.hpp" 603258Sdg#endif 613489Sphk#ifdef TARGET_OS_FAMILY_windows 624Srgrimes# include "globals_windows.hpp" 634Srgrimes#endif 64757Sdg#ifdef TARGET_OS_FAMILY_aix 65757Sdg# include "globals_aix.hpp" 664Srgrimes#endif 674Srgrimes#ifdef TARGET_OS_FAMILY_bsd 684Srgrimes# include "globals_bsd.hpp" 694Srgrimes#endif 704Srgrimes#ifdef TARGET_OS_ARCH_linux_x86 71200Sdg# include "globals_linux_x86.hpp" 724Srgrimes#endif 734Srgrimes#ifdef TARGET_OS_ARCH_linux_sparc 744Srgrimes# include "globals_linux_sparc.hpp" 753861Sbde#endif 76592Srgrimes#ifdef TARGET_OS_ARCH_linux_zero 77592Srgrimes# include "globals_linux_zero.hpp" 78757Sdg#endif 79592Srgrimes#ifdef TARGET_OS_ARCH_solaris_x86 803861Sbde# include "globals_solaris_x86.hpp" 813861Sbde#endif 823861Sbde#ifdef TARGET_OS_ARCH_solaris_sparc 833861Sbde# include "globals_solaris_sparc.hpp" 84608Srgrimes#endif 854Srgrimes#ifdef TARGET_OS_ARCH_windows_x86 864Srgrimes# include "globals_windows_x86.hpp" 874Srgrimes#endif 884Srgrimes#ifdef TARGET_OS_ARCH_linux_arm 894Srgrimes# include "globals_linux_arm.hpp" 90592Srgrimes#endif 91592Srgrimes#ifdef TARGET_OS_ARCH_linux_ppc 92592Srgrimes# include "globals_linux_ppc.hpp" 93757Sdg#endif 944Srgrimes#ifdef TARGET_OS_ARCH_aix_ppc 954Srgrimes# include "globals_aix_ppc.hpp" 964Srgrimes#endif 974Srgrimes#ifdef TARGET_OS_ARCH_bsd_x86 984Srgrimes# include "globals_bsd_x86.hpp" 994Srgrimes#endif 100570Srgrimes#ifdef TARGET_OS_ARCH_bsd_zero 101134Sdg# include "globals_bsd_zero.hpp" 1024Srgrimes#endif 103556Srgrimes#ifdef COMPILER1 104556Srgrimes#ifdef TARGET_ARCH_x86 105556Srgrimes# include "c1_globals_x86.hpp" 106556Srgrimes#endif 107134Sdg#ifdef TARGET_ARCH_sparc 1083842Sdg# include "c1_globals_sparc.hpp" 1093842Sdg#endif 1103842Sdg#ifdef TARGET_ARCH_arm 1113842Sdg# include "c1_globals_arm.hpp" 1123842Sdg#endif 1133861Sbde#ifdef TARGET_ARCH_ppc 114134Sdg# include "c1_globals_ppc.hpp" 1151998Swollman#endif 1162783Ssos#ifdef TARGET_OS_FAMILY_linux 1172783Ssos# include "c1_globals_linux.hpp" 1182783Ssos#endif 119757Sdg#ifdef TARGET_OS_FAMILY_solaris 1202216Sbde# include "c1_globals_solaris.hpp" 1212216Sbde#endif 1222783Ssos#ifdef TARGET_OS_FAMILY_windows 123757Sdg# include "c1_globals_windows.hpp" 124757Sdg#endif 125757Sdg#ifdef TARGET_OS_FAMILY_aix 1264Srgrimes# include "c1_globals_aix.hpp" 127757Sdg#endif 128757Sdg#ifdef TARGET_OS_FAMILY_bsd 1293861Sbde# include "c1_globals_bsd.hpp" 130757Sdg#endif 1313861Sbde#endif 132757Sdg#ifdef COMPILER2 1334Srgrimes#ifdef TARGET_ARCH_x86 134757Sdg# include "c2_globals_x86.hpp" 135757Sdg#endif 136134Sdg#ifdef TARGET_ARCH_sparc 137757Sdg# include "c2_globals_sparc.hpp" 138757Sdg#endif 1391321Sdg#ifdef TARGET_ARCH_arm 140757Sdg# include "c2_globals_arm.hpp" 1413489Sphk#endif 1423258Sdg#ifdef TARGET_ARCH_ppc 1433258Sdg# include "c2_globals_ppc.hpp" 1443314Sdg#endif 145718Swollman#ifdef TARGET_OS_FAMILY_linux 1463258Sdg# include "c2_globals_linux.hpp" 1473258Sdg#endif 1483258Sdg#ifdef TARGET_OS_FAMILY_solaris 1493489Sphk# include "c2_globals_solaris.hpp" 150134Sdg#endif 151556Srgrimes#ifdef TARGET_OS_FAMILY_windows 152556Srgrimes# include "c2_globals_windows.hpp" 153556Srgrimes#endif 1544Srgrimes#ifdef TARGET_OS_FAMILY_aix 155134Sdg# include "c2_globals_aix.hpp" 156134Sdg#endif 157200Sdg#ifdef TARGET_OS_FAMILY_bsd 158200Sdg# include "c2_globals_bsd.hpp" 159134Sdg#endif 1601321Sdg#endif 161757Sdg#ifdef SHARK 1624Srgrimes#ifdef TARGET_ARCH_zero 1633284Srgrimes# include "shark_globals_zero.hpp" 1643284Srgrimes#endif 1653284Srgrimes#endif 1661321Sdg 1674Srgrimes#if !defined(COMPILER1) && !defined(COMPILER2) && !defined(SHARK) 1683284Srgrimesdefine_pd_global(bool, BackgroundCompilation, false); 1693384Srgrimesdefine_pd_global(bool, UseTLAB, false); 1703384Srgrimesdefine_pd_global(bool, CICompileOSR, false); 1713384Srgrimesdefine_pd_global(bool, UseTypeProfile, false); 1723384Srgrimesdefine_pd_global(bool, UseOnStackReplacement, false); 1732512Sbdedefine_pd_global(bool, InlineIntrinsics, false); 1742512Sbdedefine_pd_global(bool, PreferInterpreterNativeStubs, true); 1752486Sdgdefine_pd_global(bool, ProfileInterpreter, false); 1762486Sdgdefine_pd_global(bool, ProfileTraps, false); 1774Srgrimesdefine_pd_global(bool, TieredCompilation, false); 1783284Srgrimes 1793284Srgrimesdefine_pd_global(intx, CompileThreshold, 0); 1803284Srgrimes 1813284Srgrimesdefine_pd_global(intx, OnStackReplacePercentage, 0); 1823284Srgrimesdefine_pd_global(bool, ResizeTLAB, false); 1833284Srgrimesdefine_pd_global(intx, FreqInlineSize, 0); 1843284Srgrimesdefine_pd_global(intx, NewSizeThreadIncrease, 4*K); 1853284Srgrimesdefine_pd_global(intx, InlineClassNatives, true); 1863284Srgrimesdefine_pd_global(intx, InlineUnsafeOps, true); 1873284Srgrimesdefine_pd_global(intx, InitialCodeCacheSize, 160*K); 1883284Srgrimesdefine_pd_global(intx, ReservedCodeCacheSize, 32*M); 1893284Srgrimesdefine_pd_global(intx, CodeCacheExpansionSize, 32*K); 1903284Srgrimesdefine_pd_global(intx, CodeCacheMinBlockLength, 1); 1913284Srgrimesdefine_pd_global(intx, CodeCacheMinimumUseSpace, 200*K); 1923284Srgrimesdefine_pd_global(uintx,MetaspaceSize, ScaleForWordSize(4*M)); 1933284Srgrimesdefine_pd_global(bool, NeverActAsServerClassMachine, true); 1943284Srgrimesdefine_pd_global(uint64_t,MaxRAM, 1ULL*G); 1953284Srgrimes#define CI_COMPILER_COUNT 0 1963284Srgrimes#else 1973284Srgrimes 1983284Srgrimes#ifdef COMPILER2 1993284Srgrimes#define CI_COMPILER_COUNT 2 2003284Srgrimes#else 2013384Srgrimes#define CI_COMPILER_COUNT 1 2023384Srgrimes#endif // COMPILER2 2034Srgrimes 2043284Srgrimes#endif // no compilers 2053284Srgrimes 2063284Srgrimes// string type aliases used only in this file 2073284Srgrimestypedef const char* ccstr; 2083284Srgrimestypedef const char* ccstrlist; // represents string arguments which accumulate 2093284Srgrimes 2103384Srgrimesstruct Flag { 2113284Srgrimes enum Flags { 2123284Srgrimes // value origin 2133284Srgrimes DEFAULT = 0, 2143284Srgrimes COMMAND_LINE = 1, 2153284Srgrimes ENVIRON_VAR = 2, 2163284Srgrimes CONFIG_FILE = 3, 2173284Srgrimes MANAGEMENT = 4, 2183284Srgrimes ERGONOMIC = 5, 2193384Srgrimes ATTACH_ON_DEMAND = 6, 2203284Srgrimes INTERNAL = 7, 2213284Srgrimes 2223284Srgrimes LAST_VALUE_ORIGIN = INTERNAL, 2233284Srgrimes VALUE_ORIGIN_BITS = 4, 2243284Srgrimes VALUE_ORIGIN_MASK = right_n_bits(VALUE_ORIGIN_BITS), 2253284Srgrimes 2263284Srgrimes // flag kind 2273284Srgrimes KIND_PRODUCT = 1 << 4, 2283284Srgrimes KIND_MANAGEABLE = 1 << 5, 2293284Srgrimes KIND_DIAGNOSTIC = 1 << 6, 2303384Srgrimes KIND_EXPERIMENTAL = 1 << 7, 2313384Srgrimes KIND_NOT_PRODUCT = 1 << 8, 2323384Srgrimes KIND_DEVELOP = 1 << 9, 2333284Srgrimes KIND_PLATFORM_DEPENDENT = 1 << 10, 2343284Srgrimes KIND_READ_WRITE = 1 << 11, 2353384Srgrimes KIND_C1 = 1 << 12, 2363384Srgrimes KIND_C2 = 1 << 13, 2373384Srgrimes KIND_ARCH = 1 << 14, 2383384Srgrimes KIND_SHARK = 1 << 15, 2393384Srgrimes KIND_LP64_PRODUCT = 1 << 16, 2403384Srgrimes KIND_COMMERCIAL = 1 << 17, 2413384Srgrimes 2423284Srgrimes KIND_MASK = ~VALUE_ORIGIN_MASK 2433384Srgrimes }; 2443284Srgrimes 2453384Srgrimes const char* _type; 2463384Srgrimes const char* _name; 2473384Srgrimes void* _addr; 2483384Srgrimes NOT_PRODUCT(const char* _doc;) 2493384Srgrimes Flags _flags; 2503384Srgrimes 2513384Srgrimes // points to all Flags static array 2523384Srgrimes static Flag* flags; 2533384Srgrimes 2543384Srgrimes // number of flags 2553384Srgrimes static size_t numFlags; 2563384Srgrimes 2573426Srgrimes static Flag* find_flag(const char* name, size_t length, bool allow_locked = false, bool return_flag = false); 2583384Srgrimes static Flag* fuzzy_match(const char* name, size_t length, bool allow_locked = false); 2593384Srgrimes 2603384Srgrimes void check_writable(); 2613384Srgrimes 2623384Srgrimes bool is_bool() const; 2633384Srgrimes bool get_bool() const; 2643384Srgrimes void set_bool(bool value); 2653384Srgrimes 2663384Srgrimes bool is_intx() const; 2673384Srgrimes intx get_intx() const; 2683384Srgrimes void set_intx(intx value); 2693795Sphk 2703795Sphk bool is_uintx() const; 2713406Sdg uintx get_uintx() const; 2723384Srgrimes void set_uintx(uintx value); 2733384Srgrimes 2743284Srgrimes bool is_uint64_t() const; 2753284Srgrimes uint64_t get_uint64_t() const; 2763384Srgrimes void set_uint64_t(uint64_t value); 2773384Srgrimes 2783284Srgrimes bool is_double() const; 2793284Srgrimes double get_double() const; 2803384Srgrimes void set_double(double value); 281570Srgrimes 2823384Srgrimes bool is_ccstr() const; 283570Srgrimes bool ccstr_accumulates() const; 2842783Ssos ccstr get_ccstr() const; 2852783Ssos void set_ccstr(ccstr value); 2862783Ssos 2872783Ssos Flags get_origin(); 2882783Ssos void set_origin(Flags origin); 2892783Ssos 2902783Ssos bool is_default(); 2912783Ssos bool is_ergonomic(); 2922783Ssos bool is_command_line(); 2932783Ssos 2942783Ssos bool is_product() const; 2952783Ssos bool is_manageable() const; 2962783Ssos bool is_diagnostic() const; 2972783Ssos bool is_experimental() const; 2982783Ssos bool is_notproduct() const; 2992783Ssos bool is_develop() const; 3002783Ssos bool is_read_write() const; 3012783Ssos bool is_commercial() const; 3023489Sphk 3033258Sdg bool is_constant_in_binary() const; 3043258Sdg 3053258Sdg bool is_unlocker() const; 3063258Sdg bool is_unlocked() const; 3073258Sdg bool is_writeable() const; 3083258Sdg bool is_external() const; 3093258Sdg 3104Srgrimes bool is_unlocker_ext() const; 3113258Sdg bool is_unlocked_ext() const; 3123258Sdg bool is_writeable_ext() const; 3133258Sdg bool is_external_ext() const; 3143258Sdg 3153258Sdg void get_locked_message(char*, int) const; 3163258Sdg void get_locked_message_ext(char*, int) const; 3173258Sdg 3183258Sdg void print_on(outputStream* st, bool withComments = false ); 3193258Sdg void print_kind(outputStream* st); 3203258Sdg void print_as_flag(outputStream* st); 3213258Sdg}; 3223258Sdg 3233258Sdg// debug flags control various aspects of the VM and are global accessible 3243258Sdg 3253258Sdg// use FlagSetting to temporarily change some debug flag 3263258Sdg// e.g. FlagSetting fs(DebugThisAndThat, true); 3273258Sdg// restored to previous value upon leaving scope 3283258Sdgclass FlagSetting { 3293258Sdg bool val; 3303258Sdg bool* flag; 3313258Sdg public: 3323258Sdg FlagSetting(bool& fl, bool newValue) { flag = &fl; val = fl; fl = newValue; } 3333258Sdg ~FlagSetting() { *flag = val; } 3343258Sdg}; 3353258Sdg 3363258Sdg 3373258Sdgclass CounterSetting { 3383258Sdg intx* counter; 3393258Sdg public: 3403258Sdg CounterSetting(intx* cnt) { counter = cnt; (*counter)++; } 3413258Sdg ~CounterSetting() { (*counter)--; } 3423258Sdg}; 3433258Sdg 3443258Sdg 3453258Sdgclass UIntFlagSetting { 3463258Sdg uintx val; 3473258Sdg uintx* flag; 3483258Sdg public: 3493258Sdg UIntFlagSetting(uintx& fl, uintx newValue) { flag = &fl; val = fl; fl = newValue; } 3503258Sdg ~UIntFlagSetting() { *flag = val; } 3513258Sdg}; 3523258Sdg 3533258Sdg 3543258Sdgclass DoubleFlagSetting { 3553258Sdg double val; 3563258Sdg double* flag; 3573258Sdg public: 3583258Sdg DoubleFlagSetting(double& fl, double newValue) { flag = &fl; val = fl; fl = newValue; } 3593258Sdg ~DoubleFlagSetting() { *flag = val; } 3603258Sdg}; 3613258Sdg 3623258Sdg 3633258Sdgclass CommandLineFlags { 3643258Sdg public: 3653258Sdg static bool boolAt(const char* name, size_t len, bool* value); 3663258Sdg static bool boolAt(const char* name, bool* value) { return boolAt(name, strlen(name), value); } 3673258Sdg static bool boolAtPut(const char* name, size_t len, bool* value, Flag::Flags origin); 3683258Sdg static bool boolAtPut(const char* name, bool* value, Flag::Flags origin) { return boolAtPut(name, strlen(name), value, origin); } 3693258Sdg 3703258Sdg static bool intxAt(const char* name, size_t len, intx* value); 3713258Sdg static bool intxAt(const char* name, intx* value) { return intxAt(name, strlen(name), value); } 3723258Sdg static bool intxAtPut(const char* name, size_t len, intx* value, Flag::Flags origin); 3733258Sdg static bool intxAtPut(const char* name, intx* value, Flag::Flags origin) { return intxAtPut(name, strlen(name), value, origin); } 3743258Sdg 3753258Sdg static bool uintxAt(const char* name, size_t len, uintx* value); 3763258Sdg static bool uintxAt(const char* name, uintx* value) { return uintxAt(name, strlen(name), value); } 3773258Sdg static bool uintxAtPut(const char* name, size_t len, uintx* value, Flag::Flags origin); 3783258Sdg static bool uintxAtPut(const char* name, uintx* value, Flag::Flags origin) { return uintxAtPut(name, strlen(name), value, origin); } 3793258Sdg 3803258Sdg static bool uint64_tAt(const char* name, size_t len, uint64_t* value); 3813258Sdg static bool uint64_tAt(const char* name, uint64_t* value) { return uint64_tAt(name, strlen(name), value); } 3823258Sdg static bool uint64_tAtPut(const char* name, size_t len, uint64_t* value, Flag::Flags origin); 3833258Sdg static bool uint64_tAtPut(const char* name, uint64_t* value, Flag::Flags origin) { return uint64_tAtPut(name, strlen(name), value, origin); } 3843489Sphk 3853258Sdg static bool doubleAt(const char* name, size_t len, double* value); 3861998Swollman static bool doubleAt(const char* name, double* value) { return doubleAt(name, strlen(name), value); } 3871321Sdg static bool doubleAtPut(const char* name, size_t len, double* value, Flag::Flags origin); 3881998Swollman static bool doubleAtPut(const char* name, double* value, Flag::Flags origin) { return doubleAtPut(name, strlen(name), value, origin); } 3891998Swollman 3901998Swollman static bool ccstrAt(const char* name, size_t len, ccstr* value); 3911998Swollman static bool ccstrAt(const char* name, ccstr* value) { return ccstrAt(name, strlen(name), value); } 3921998Swollman // Contract: Flag will make private copy of the incoming value. 3931998Swollman // Outgoing value is always malloc-ed, and caller MUST call free. 3941998Swollman static bool ccstrAtPut(const char* name, size_t len, ccstr* value, Flag::Flags origin); 3951998Swollman static bool ccstrAtPut(const char* name, ccstr* value, Flag::Flags origin) { return ccstrAtPut(name, strlen(name), value, origin); } 3961998Swollman 3971998Swollman // Returns false if name is not a command line flag. 3981998Swollman static bool wasSetOnCmdline(const char* name, bool* value); 3991998Swollman static void printSetFlags(outputStream* out); 4001998Swollman 4011998Swollman static void printFlags(outputStream* out, bool withComments); 4021998Swollman 4031998Swollman static void verify() PRODUCT_RETURN; 4041998Swollman}; 405556Srgrimes 4061998Swollman// use this for flags that are true by default in the debug version but 4071998Swollman// false in the optimized version, and vice versa 4081998Swollman#ifdef ASSERT 4091998Swollman#define trueInDebug true 4101998Swollman#define falseInDebug false 4111998Swollman#else 4121998Swollman#define trueInDebug false 4131998Swollman#define falseInDebug true 4141998Swollman#endif 4151998Swollman 4161998Swollman// use this for flags that are true per default in the product build 4171998Swollman// but false in development builds, and vice versa 4181998Swollman#ifdef PRODUCT 4191998Swollman#define trueInProduct true 4201998Swollman#define falseInProduct false 4211998Swollman#else 4221998Swollman#define trueInProduct false 4231998Swollman#define falseInProduct true 4242495Spst#endif 4252495Spst 4262495Spst#ifdef JAVASE_EMBEDDED 4272495Spst#define falseInEmbedded false 4282495Spst#else 4292495Spst#define falseInEmbedded true 4302495Spst#endif 4312495Spst 4322495Spst// develop flags are settable / visible only during development and are constant in the PRODUCT version 4332495Spst// product flags are always settable / visible 4342495Spst// notproduct flags are settable / visible only during development and are not declared in the PRODUCT version 4352495Spst 4362495Spst// A flag must be declared with one of the following types: 4372495Spst// bool, intx, uintx, ccstr. 4382495Spst// The type "ccstr" is an alias for "const char*" and is used 4392495Spst// only in this file, because the macrology requires single-token type names. 4402495Spst 4412495Spst// Note: Diagnostic options not meant for VM tuning or for product modes. 4422495Spst// They are to be used for VM quality assurance or field diagnosis 4432495Spst// of VM bugs. They are hidden so that users will not be encouraged to 4442495Spst// try them as if they were VM ordinary execution options. However, they 4452495Spst// are available in the product version of the VM. Under instruction 4462495Spst// from support engineers, VM customers can turn them on to collect 4472495Spst// diagnostic information about VM problems. To use a VM diagnostic 4482495Spst// option, you must first specify +UnlockDiagnosticVMOptions. 4492495Spst// (This master switch also affects the behavior of -Xprintflags.) 4502495Spst// 4513117Spst// experimental flags are in support of features that are not 4522495Spst// part of the officially supported product, but are available 4532495Spst// for experimenting with. They could, for example, be performance 4541998Swollman// features that may not have undergone full or rigorous QA, but which may 4551998Swollman// help performance in some cases and released for experimentation 4561998Swollman// by the community of users and developers. This flag also allows one to 4571998Swollman// be able to build a fully supported product that nonetheless also 4581998Swollman// ships with some unsupported, lightly tested, experimental features. 4591998Swollman// Like the UnlockDiagnosticVMOptions flag above, there is a corresponding 4601998Swollman// UnlockExperimentalVMOptions flag, which allows the control and 4611998Swollman// modification of the experimental flags. 4621998Swollman// 4631998Swollman// Nota bene: neither diagnostic nor experimental options should be used casually, 4641998Swollman// and they are not supported on production loads, except under explicit 4651998Swollman// direction from support engineers. 4661998Swollman// 4671998Swollman// manageable flags are writeable external product flags. 4681998Swollman// They are dynamically writeable through the JDK management interface 4691998Swollman// (com.sun.management.HotSpotDiagnosticMXBean API) and also through JConsole. 4701998Swollman// These flags are external exported interface (see CCC). The list of 4711998Swollman// manageable flags can be queried programmatically through the management 4721998Swollman// interface. 4731998Swollman// 4741998Swollman// A flag can be made as "manageable" only if 4751998Swollman// - the flag is defined in a CCC as an external exported interface. 4761998Swollman// - the VM implementation supports dynamic setting of the flag. 477556Srgrimes// This implies that the VM must *always* query the flag variable 478556Srgrimes// and not reuse state related to the flag state at any given time. 4794Srgrimes// - you want the flag to be queried programmatically by the customers. 4804Srgrimes// 4814Srgrimes// product_rw flags are writeable internal product flags. 4824Srgrimes// They are like "manageable" flags but for internal/private use. 4834Srgrimes// The list of product_rw flags are internal/private flags which 4844Srgrimes// may be changed/removed in a future release. It can be set 4854Srgrimes// through the management interface to get/set value 4864Srgrimes// when the name of flag is supplied. 4874Srgrimes// 4884Srgrimes// A flag can be made as "product_rw" only if 4894Srgrimes// - the VM implementation supports dynamic setting of the flag. 4904Srgrimes// This implies that the VM must *always* query the flag variable 4914Srgrimes// and not reuse state related to the flag state at any given time. 4924Srgrimes// 493757Sdg// Note that when there is a need to support develop flags to be writeable, 4944Srgrimes// it can be done in the same way as product_rw. 495570Srgrimes 496570Srgrimes#define RUNTIME_FLAGS(develop, develop_pd, product, product_pd, diagnostic, experimental, notproduct, manageable, product_rw, lp64_product) \ 497570Srgrimes \ 498570Srgrimes lp64_product(bool, UseCompressedOops, false, \ 499974Sdg "Use 32-bit object references in 64-bit VM. " \ 500570Srgrimes "lp64_product means flag is always constant in 32 bit VM") \ 501570Srgrimes \ 5024Srgrimes lp64_product(bool, UseCompressedClassPointers, false, \ 503570Srgrimes "Use 32-bit class pointers in 64-bit VM. " \ 504757Sdg "lp64_product means flag is always constant in 32 bit VM") \ 5054Srgrimes \ 5061321Sdg notproduct(bool, CheckCompressedOops, true, \ 507757Sdg "Generate checks in encoding/decoding code in debug VM") \ 5084Srgrimes \ 509757Sdg product_pd(uintx, HeapBaseMinAddress, \ 510570Srgrimes "OS specific low limit for heap base address") \ 511760Srgrimes \ 512757Sdg diagnostic(bool, PrintCompressedOopsMode, false, \ 5134Srgrimes "Print compressed oops base address and encoding mode") \ 5144Srgrimes \ 5154Srgrimes lp64_product(intx, ObjectAlignmentInBytes, 8, \ 5164Srgrimes "Default object alignment in bytes, 8 is minimum") \ 517608Srgrimes \ 518974Sdg product(bool, AssumeMP, false, \ 519974Sdg "Instruct the VM to assume multiple processors are available") \ 520974Sdg \ 521974Sdg /* UseMembar is theoretically a temp flag used for memory barrier \ 522757Sdg * removal testing. It was supposed to be removed before FCS but has \ 523757Sdg * been re-added (see 6401008) */ \ 524608Srgrimes product_pd(bool, UseMembar, \ 525757Sdg "(Unstable) Issues membars on thread state transitions") \ 526608Srgrimes \ 527757Sdg develop(bool, CleanChunkPoolAsync, falseInEmbedded, \ 528757Sdg "Clean the chunk pool asynchronously") \ 529974Sdg \ 530757Sdg experimental(bool, AlwaysSafeConstructors, false, \ 531757Sdg "Force safe construction, as if all fields are final.") \ 532757Sdg \ 533757Sdg /* Temporary: See 6948537 */ \ 534757Sdg experimental(bool, UseMemSetInBOT, true, \ 535757Sdg "(Unstable) uses memset in BOT updates in GC code") \ 536570Srgrimes \ 5374Srgrimes diagnostic(bool, UnlockDiagnosticVMOptions, trueInDebug, \ 538592Srgrimes "Enable normal processing of flags relating to field diagnostics")\ 539592Srgrimes \ 540592Srgrimes experimental(bool, UnlockExperimentalVMOptions, false, \ 541592Srgrimes "Enable normal processing of flags relating to experimental " \ 542592Srgrimes "features") \ 543592Srgrimes \ 5444Srgrimes product(bool, JavaMonitorsInStackTrace, true, \ 5454Srgrimes "Print information about Java monitor locks when the stacks are" \ 546570Srgrimes "dumped") \ 5474Srgrimes \ 5484Srgrimes product_pd(bool, UseLargePages, \ 5494Srgrimes "Use large page memory") \ 5504Srgrimes \ 5514Srgrimes product_pd(bool, UseLargePagesIndividualAllocation, \ 5524Srgrimes "Allocate large pages individually for better affinity") \ 5534Srgrimes \ 5544Srgrimes develop(bool, LargePagesIndividualAllocationInjectError, false, \ 555757Sdg "Fail large pages individual allocation") \ 556757Sdg \ 557757Sdg product(bool, UseLargePagesInMetaspace, false, \ 558757Sdg "Use large page memory in metaspace. " \ 559757Sdg "Only used if UseLargePages is enabled.") \ 560200Sdg \ 561200Sdg develop(bool, TracePageSizes, false, \ 562200Sdg "Trace page size selection and usage") \ 563757Sdg \ 5642512Sbde product(bool, UseNUMA, false, \ 565757Sdg "Use NUMA if available") \ 566757Sdg \ 5674Srgrimes product(bool, UseNUMAInterleaving, false, \ 5684Srgrimes "Interleave memory across NUMA nodes if available") \ 569757Sdg \ 570757Sdg product(uintx, NUMAInterleaveGranularity, 2*M, \ 571757Sdg "Granularity to use for NUMA interleaving on Windows OS") \ 5723842Sdg \ 573757Sdg product(bool, ForceNUMA, false, \ 574757Sdg "Force NUMA optimizations on single-node/UMA systems") \ 5753842Sdg \ 5763842Sdg product(uintx, NUMAChunkResizeWeight, 20, \ 5773842Sdg "Percentage (0-100) used to weight the current sample when " \ 5783842Sdg "computing exponentially decaying average for " \ 5793842Sdg "AdaptiveNUMAChunkSizing") \ 5803842Sdg \ 5813842Sdg product(uintx, NUMASpaceResizeRate, 1*G, \ 5823842Sdg "Do not reallocate more than this amount per collection") \ 583757Sdg \ 584757Sdg product(bool, UseAdaptiveNUMAChunkSizing, true, \ 585757Sdg "Enable adaptive chunk sizing for NUMA") \ 586757Sdg \ 587757Sdg product(bool, NUMAStats, false, \ 588757Sdg "Print NUMA stats in detailed heap information") \ 589757Sdg \ 590757Sdg product(uintx, NUMAPageScanRate, 256, \ 591757Sdg "Maximum number of pages to include in the page scan procedure") \ 592757Sdg \ 593757Sdg product_pd(bool, NeedsDeoptSuspend, \ 5941321Sdg "True for register window machines (sparc/ia64)") \ 595757Sdg \ 596757Sdg product(intx, UseSSE, 99, \ 597757Sdg "Highest supported SSE instructions set on x86/x64") \ 598974Sdg \ 599757Sdg product(bool, UseAES, false, \ 600757Sdg "Control whether AES instructions can be used on x86/x64") \ 6012512Sbde \ 602757Sdg product(bool, UseSHA, false, \ 603757Sdg "Control whether SHA instructions can be used on SPARC") \ 604757Sdg \ 605757Sdg product(uintx, LargePageSizeInBytes, 0, \ 606757Sdg "Large page size (0 to let VM choose the page size)") \ 6071321Sdg \ 6084Srgrimes product(uintx, LargePageHeapSizeThreshold, 128*M, \ 6094Srgrimes "Use large pages if maximum heap is at least this big") \ 610757Sdg \ 611757Sdg product(bool, ForceTimeHighResolution, false, \ 612757Sdg "Using high time resolution (for Win32 only)") \ 6131046Sdg \ 614757Sdg develop(bool, TraceItables, false, \ 6154Srgrimes "Trace initialization and use of itables") \ 6164Srgrimes \ 6174Srgrimes develop(bool, TracePcPatching, false, \ 6184Srgrimes "Trace usage of frame::patch_pc") \ 619757Sdg \ 620757Sdg develop(bool, TraceJumps, false, \ 621757Sdg "Trace assembly jumps in thread ring buffer") \ 622757Sdg \ 623757Sdg develop(bool, TraceRelocator, false, \ 624757Sdg "Trace the bytecode relocator") \ 625757Sdg \ 6264Srgrimes develop(bool, TraceLongCompiles, false, \ 6274Srgrimes "Print out every time compilation is longer than " \ 6284Srgrimes "a given threshold") \ 629757Sdg \ 6304Srgrimes develop(bool, SafepointALot, false, \ 6314Srgrimes "Generate a lot of safepoints. This works with " \ 632757Sdg "GuaranteedSafepointInterval") \ 633757Sdg \ 634757Sdg product_pd(bool, BackgroundCompilation, \ 6354Srgrimes "A thread requesting compilation is not blocked during " \ 636757Sdg "compilation") \ 637974Sdg \ 638757Sdg product(bool, PrintVMQWaitTime, false, \ 6394Srgrimes "Print out the waiting time in VM operation queue") \ 6404Srgrimes \ 6414Srgrimes develop(bool, NoYieldsInMicrolock, false, \ 642757Sdg "Disable yields in microlock") \ 643757Sdg \ 644757Sdg develop(bool, TraceOopMapGeneration, false, \ 6454Srgrimes "Show OopMapGeneration") \ 6464Srgrimes \ 647757Sdg product(bool, MethodFlushing, true, \ 648757Sdg "Reclamation of zombie and not-entrant methods") \ 649757Sdg \ 6504Srgrimes develop(bool, VerifyStack, false, \ 651757Sdg "Verify stack of each thread when it is entering a runtime call") \ 6524Srgrimes \ 6534Srgrimes diagnostic(bool, ForceUnreachable, false, \ 654757Sdg "Make all non code cache addresses to be unreachable by " \ 6554Srgrimes "forcing use of 64bit literal fixups") \ 656570Srgrimes \ 6574Srgrimes notproduct(bool, StressDerivedPointers, false, \ 6584Srgrimes "Force scavenge when a derived pointer is detected on stack " \ 6594Srgrimes "after rtm call") \ 6604Srgrimes \ 6614Srgrimes develop(bool, TraceDerivedPointers, false, \ 662757Sdg "Trace traversal of derived pointers on stack") \ 663570Srgrimes \ 6644Srgrimes notproduct(bool, TraceCodeBlobStacks, false, \ 6654Srgrimes "Trace stack-walk of codeblobs") \ 6661688Sdg \ 667757Sdg product(bool, PrintJNIResolving, false, \ 6684Srgrimes "Used to implement -v:jni") \ 669570Srgrimes \ 6704Srgrimes notproduct(bool, PrintRewrites, false, \ 6714Srgrimes "Print methods that are being rewritten") \ 6724Srgrimes \ 673757Sdg product(bool, UseInlineCaches, true, \ 674757Sdg "Use Inline Caches for virtual calls ") \ 6754Srgrimes \ 676570Srgrimes develop(bool, InlineArrayCopy, true, \ 6774Srgrimes "Inline arraycopy native that is known to be part of " \ 678570Srgrimes "base library DLL") \ 679757Sdg \ 6804Srgrimes develop(bool, InlineObjectHash, true, \ 681570Srgrimes "Inline Object::hashCode() native that is known to be part " \ 6824Srgrimes "of base library DLL") \ 683570Srgrimes \ 6844Srgrimes develop(bool, InlineNatives, true, \ 685570Srgrimes "Inline natives that are known to be part of base library DLL") \ 6864Srgrimes \ 6874Srgrimes develop(bool, InlineMathNatives, true, \ 6881688Sdg "Inline SinD, CosD, etc.") \ 689757Sdg \ 6904Srgrimes develop(bool, InlineClassNatives, true, \ 6914Srgrimes "Inline Class.isInstance, etc") \ 6924Srgrimes \ 6934Srgrimes develop(bool, InlineThreadNatives, true, \ 6944Srgrimes "Inline Thread.currentThread, etc") \ 6954Srgrimes \ 6964Srgrimes develop(bool, InlineUnsafeOps, true, \ 6971321Sdg "Inline memory ops (native methods) from sun.misc.Unsafe") \ 6984Srgrimes \ 699592Srgrimes product(bool, CriticalJNINatives, true, \ 700757Sdg "Check for critical JNI entry points") \ 701757Sdg \ 702757Sdg notproduct(bool, StressCriticalJNINatives, false, \ 703757Sdg "Exercise register saving code in critical natives") \ 704757Sdg \ 7054Srgrimes product(bool, UseSSE42Intrinsics, false, \ 706757Sdg "SSE4.2 versions of intrinsics") \ 7074Srgrimes \ 7084Srgrimes product(bool, UseAESIntrinsics, false, \ 709570Srgrimes "Use intrinsics for AES versions of crypto") \ 710757Sdg \ 711757Sdg product(bool, UseSHA1Intrinsics, false, \ 712757Sdg "Use intrinsics for SHA-1 crypto hash function") \ 713757Sdg \ 714570Srgrimes product(bool, UseSHA256Intrinsics, false, \ 7153728Sphk "Use intrinsics for SHA-224 and SHA-256 crypto hash functions") \ 7163861Sbde \ 7173861Sbde product(bool, UseSHA512Intrinsics, false, \ 7183728Sphk "Use intrinsics for SHA-384 and SHA-512 crypto hash functions") \ 7193728Sphk \ 7203728Sphk product(bool, UseCRC32Intrinsics, false, \ 7213728Sphk "use intrinsics for java.util.zip.CRC32") \ 7224Srgrimes \ 7234Srgrimes develop(bool, TraceCallFixup, false, \ 7243728Sphk "Trace all call fixups") \ 7254Srgrimes \ 726757Sdg develop(bool, DeoptimizeALot, false, \ 727570Srgrimes "Deoptimize at every exit from the runtime system") \ 728757Sdg \ 7294Srgrimes notproduct(ccstrlist, DeoptimizeOnlyAt, "", \ 730570Srgrimes "A comma separated list of bcis to deoptimize at") \ 731570Srgrimes \ 7324Srgrimes product(bool, DeoptimizeRandom, false, \ 733757Sdg "Deoptimize random frames on random exit from the runtime system")\ 7344Srgrimes \ 7354Srgrimes notproduct(bool, ZombieALot, false, \ 736757Sdg "Create zombies (non-entrant) at exit from the runtime system") \ 7374Srgrimes \ 7384Srgrimes product(bool, UnlinkSymbolsALot, false, \ 7391321Sdg "Unlink unreferenced symbols from the symbol table at safepoints")\ 740757Sdg \ 7414Srgrimes notproduct(bool, WalkStackALot, false, \ 7424Srgrimes "Trace stack (no print) at every exit from the runtime system") \ 7434Srgrimes \ 7444Srgrimes product(bool, Debugging, false, \ 7454Srgrimes "Set when executing debug methods in debug.cpp " \ 7464Srgrimes "(to prevent triggering assertions)") \ 7471321Sdg \ 7484Srgrimes notproduct(bool, StrictSafepointChecks, trueInDebug, \ 749608Srgrimes "Enable strict checks that safepoints cannot happen for threads " \ 750608Srgrimes "that use No_Safepoint_Verifier") \ 751608Srgrimes \ 752974Sdg notproduct(bool, VerifyLastFrame, false, \ 753608Srgrimes "Verify oops on last frame on entry to VM") \ 754757Sdg \ 755757Sdg develop(bool, TraceHandleAllocation, false, \ 7561549Srgrimes "Print out warnings when suspiciously many handles are allocated")\ 757200Sdg \ 7581549Srgrimes product(bool, UseCompilerSafepoints, true, \ 7591549Srgrimes "Stop at safepoints in compiled code") \ 7601549Srgrimes \ 7611549Srgrimes product(bool, FailOverToOldVerifier, true, \ 7621549Srgrimes "Fail over to old verifier when split verifier fails") \ 7632500Sdg \ 7641549Srgrimes develop(bool, ShowSafepointMsgs, false, \ 7651549Srgrimes "Show message about safepoint synchronization") \ 7661549Srgrimes \ 7671549Srgrimes product(bool, SafepointTimeout, false, \ 7681549Srgrimes "Time out and warn or fail after SafepointTimeoutDelay " \ 769757Sdg "milliseconds if failed to reach safepoint") \ 7704Srgrimes \ 7711549Srgrimes develop(bool, DieOnSafepointTimeout, false, \ 7721549Srgrimes "Die upon failure to reach safepoint (see SafepointTimeout)") \ 773134Sdg \ 774570Srgrimes /* 50 retries * (5 * current_retry_count) millis = ~6.375 seconds */ \ 775570Srgrimes /* typically, at most a few retries are needed */ \ 7761058Sdg product(intx, SuspendRetryCount, 50, \ 7771058Sdg "Maximum retry count for an external suspend request") \ 7781058Sdg \ 7791058Sdg product(intx, SuspendRetryDelay, 5, \ 7801058Sdg "Milliseconds to delay per retry (* current_retry_count)") \ 7811058Sdg \ 7821058Sdg product(bool, AssertOnSuspendWaitFailure, false, \ 7831058Sdg "Assert/Guarantee on external suspend wait failure") \ 7841058Sdg \ 785134Sdg product(bool, TraceSuspendWaitFailures, false, \ 786134Sdg "Trace external suspend wait failures") \ 787134Sdg \ 7881058Sdg product(bool, MaxFDLimit, true, \ 7894Srgrimes "Bump the number of file descriptors to maximum in Solaris") \ 7904Srgrimes \ 7911549Srgrimes diagnostic(bool, LogEvents, true, \ 7924Srgrimes "Enable the various ring buffer event logs") \ 7934Srgrimes \ 794757Sdg diagnostic(uintx, LogEventsBufferEntries, 10, \ 795757Sdg "Number of ring buffer event logs") \ 7961549Srgrimes \ 7974Srgrimes product(bool, BytecodeVerificationRemote, true, \ 7981549Srgrimes "Enable the Java bytecode verifier for remote classes") \ 7994Srgrimes \ 800200Sdg product(bool, BytecodeVerificationLocal, false, \ 801592Srgrimes "Enable the Java bytecode verifier for local classes") \ 802757Sdg \ 803757Sdg develop(bool, ForceFloatExceptions, trueInDebug, \ 8044Srgrimes "Force exceptions on FP stack under/overflow") \ 805757Sdg \ 806757Sdg develop(bool, VerifyStackAtCalls, false, \ 807757Sdg "Verify that the stack pointer is unchanged after calls") \ 808757Sdg \ 8094Srgrimes develop(bool, TraceJavaAssertions, false, \ 8104Srgrimes "Trace java language assertions") \ 8114Srgrimes \ 8124Srgrimes notproduct(bool, CheckAssertionStatusDirectives, false, \ 813 "Temporary - see javaClasses.cpp") \ 814 \ 815 notproduct(bool, PrintMallocFree, false, \ 816 "Trace calls to C heap malloc/free allocation") \ 817 \ 818 product(bool, PrintOopAddress, false, \ 819 "Always print the location of the oop") \ 820 \ 821 notproduct(bool, VerifyCodeCache, false, \ 822 "Verify code cache on memory allocation/deallocation") \ 823 \ 824 develop(bool, ZapDeadCompiledLocals, false, \ 825 "Zap dead locals in compiler frames") \ 826 \ 827 notproduct(bool, ZapDeadLocalsOld, false, \ 828 "Zap dead locals (old version, zaps all frames when " \ 829 "entering the VM") \ 830 \ 831 notproduct(bool, CheckOopishValues, false, \ 832 "Warn if value contains oop (requires ZapDeadLocals)") \ 833 \ 834 develop(bool, UseMallocOnly, false, \ 835 "Use only malloc/free for allocation (no resource area/arena)") \ 836 \ 837 develop(bool, PrintMalloc, false, \ 838 "Print all malloc/free calls") \ 839 \ 840 develop(bool, PrintMallocStatistics, false, \ 841 "Print malloc/free statistics") \ 842 \ 843 develop(bool, ZapResourceArea, trueInDebug, \ 844 "Zap freed resource/arena space with 0xABABABAB") \ 845 \ 846 notproduct(bool, ZapVMHandleArea, trueInDebug, \ 847 "Zap freed VM handle space with 0xBCBCBCBC") \ 848 \ 849 develop(bool, ZapJNIHandleArea, trueInDebug, \ 850 "Zap freed JNI handle space with 0xFEFEFEFE") \ 851 \ 852 notproduct(bool, ZapStackSegments, trueInDebug, \ 853 "Zap allocated/freed stack segments with 0xFADFADED") \ 854 \ 855 develop(bool, ZapUnusedHeapArea, trueInDebug, \ 856 "Zap unused heap space with 0xBAADBABE") \ 857 \ 858 develop(bool, TraceZapUnusedHeapArea, false, \ 859 "Trace zapping of unused heap space") \ 860 \ 861 develop(bool, CheckZapUnusedHeapArea, false, \ 862 "Check zapping of unused heap space") \ 863 \ 864 develop(bool, ZapFillerObjects, trueInDebug, \ 865 "Zap filler objects with 0xDEAFBABE") \ 866 \ 867 develop(bool, PrintVMMessages, true, \ 868 "Print VM messages on console") \ 869 \ 870 product(bool, PrintGCApplicationConcurrentTime, false, \ 871 "Print the time the application has been running") \ 872 \ 873 product(bool, PrintGCApplicationStoppedTime, false, \ 874 "Print the time the application has been stopped") \ 875 \ 876 diagnostic(bool, VerboseVerification, false, \ 877 "Display detailed verification details") \ 878 \ 879 notproduct(uintx, ErrorHandlerTest, 0, \ 880 "If > 0, provokes an error after VM initialization; the value " \ 881 "determines which error to provoke. See test_error_handler() " \ 882 "in debug.cpp.") \ 883 \ 884 develop(bool, Verbose, false, \ 885 "Print additional debugging information from other modes") \ 886 \ 887 develop(bool, PrintMiscellaneous, false, \ 888 "Print uncategorized debugging information (requires +Verbose)") \ 889 \ 890 develop(bool, WizardMode, false, \ 891 "Print much more debugging information") \ 892 \ 893 product(bool, ShowMessageBoxOnError, false, \ 894 "Keep process alive on VM fatal error") \ 895 \ 896 product(bool, CreateMinidumpOnCrash, false, \ 897 "Create minidump on VM fatal error") \ 898 \ 899 product_pd(bool, UseOSErrorReporting, \ 900 "Let VM fatal error propagate to the OS (ie. WER on Windows)") \ 901 \ 902 product(bool, SuppressFatalErrorMessage, false, \ 903 "Report NO fatal error message (avoid deadlock)") \ 904 \ 905 product(ccstrlist, OnError, "", \ 906 "Run user-defined commands on fatal error; see VMError.cpp " \ 907 "for examples") \ 908 \ 909 product(ccstrlist, OnOutOfMemoryError, "", \ 910 "Run user-defined commands on first java.lang.OutOfMemoryError") \ 911 \ 912 manageable(bool, HeapDumpBeforeFullGC, false, \ 913 "Dump heap to file before any major stop-the-world GC") \ 914 \ 915 manageable(bool, HeapDumpAfterFullGC, false, \ 916 "Dump heap to file after any major stop-the-world GC") \ 917 \ 918 manageable(bool, HeapDumpOnOutOfMemoryError, false, \ 919 "Dump heap to file when java.lang.OutOfMemoryError is thrown") \ 920 \ 921 manageable(ccstr, HeapDumpPath, NULL, \ 922 "When HeapDumpOnOutOfMemoryError is on, the path (filename or " \ 923 "directory) of the dump file (defaults to java_pid<pid>.hprof " \ 924 "in the working directory)") \ 925 \ 926 develop(uintx, SegmentedHeapDumpThreshold, 2*G, \ 927 "Generate a segmented heap dump (JAVA PROFILE 1.0.2 format) " \ 928 "when the heap usage is larger than this") \ 929 \ 930 develop(uintx, HeapDumpSegmentSize, 1*G, \ 931 "Approximate segment size when generating a segmented heap dump") \ 932 \ 933 develop(bool, BreakAtWarning, false, \ 934 "Execute breakpoint upon encountering VM warning") \ 935 \ 936 develop(bool, TraceVMOperation, false, \ 937 "Trace VM operations") \ 938 \ 939 develop(bool, UseFakeTimers, false, \ 940 "Tell whether the VM should use system time or a fake timer") \ 941 \ 942 product(ccstr, NativeMemoryTracking, "off", \ 943 "Native memory tracking options") \ 944 \ 945 diagnostic(bool, PrintNMTStatistics, false, \ 946 "Print native memory tracking summary data if it is on") \ 947 \ 948 diagnostic(bool, LogCompilation, false, \ 949 "Log compilation activity in detail to LogFile") \ 950 \ 951 product(bool, PrintCompilation, false, \ 952 "Print compilations") \ 953 \ 954 diagnostic(bool, TraceNMethodInstalls, false, \ 955 "Trace nmethod installation") \ 956 \ 957 diagnostic(intx, ScavengeRootsInCode, 2, \ 958 "0: do not allow scavengable oops in the code cache; " \ 959 "1: allow scavenging from the code cache; " \ 960 "2: emit as many constants as the compiler can see") \ 961 \ 962 product(bool, AlwaysRestoreFPU, false, \ 963 "Restore the FPU control word after every JNI call (expensive)") \ 964 \ 965 diagnostic(bool, PrintCompilation2, false, \ 966 "Print additional statistics per compilation") \ 967 \ 968 diagnostic(bool, PrintAdapterHandlers, false, \ 969 "Print code generated for i2c/c2i adapters") \ 970 \ 971 diagnostic(bool, VerifyAdapterCalls, trueInDebug, \ 972 "Verify that i2c/c2i adapters are called properly") \ 973 \ 974 develop(bool, VerifyAdapterSharing, false, \ 975 "Verify that the code for shared adapters is the equivalent") \ 976 \ 977 diagnostic(bool, PrintAssembly, false, \ 978 "Print assembly code (using external disassembler.so)") \ 979 \ 980 diagnostic(ccstr, PrintAssemblyOptions, NULL, \ 981 "Print options string passed to disassembler.so") \ 982 \ 983 diagnostic(bool, PrintNMethods, false, \ 984 "Print assembly code for nmethods when generated") \ 985 \ 986 diagnostic(bool, PrintNativeNMethods, false, \ 987 "Print assembly code for native nmethods when generated") \ 988 \ 989 develop(bool, PrintDebugInfo, false, \ 990 "Print debug information for all nmethods when generated") \ 991 \ 992 develop(bool, PrintRelocations, false, \ 993 "Print relocation information for all nmethods when generated") \ 994 \ 995 develop(bool, PrintDependencies, false, \ 996 "Print dependency information for all nmethods when generated") \ 997 \ 998 develop(bool, PrintExceptionHandlers, false, \ 999 "Print exception handler tables for all nmethods when generated") \ 1000 \ 1001 develop(bool, StressCompiledExceptionHandlers, false, \ 1002 "Exercise compiled exception handlers") \ 1003 \ 1004 develop(bool, InterceptOSException, false, \ 1005 "Start debugger when an implicit OS (e.g. NULL) " \ 1006 "exception happens") \ 1007 \ 1008 product(bool, PrintCodeCache, false, \ 1009 "Print the code cache memory usage when exiting") \ 1010 \ 1011 develop(bool, PrintCodeCache2, false, \ 1012 "Print detailed usage information on the code cache when exiting")\ 1013 \ 1014 product(bool, PrintCodeCacheOnCompilation, false, \ 1015 "Print the code cache memory usage each time a method is " \ 1016 "compiled") \ 1017 \ 1018 diagnostic(bool, PrintStubCode, false, \ 1019 "Print generated stub code") \ 1020 \ 1021 product(bool, StackTraceInThrowable, true, \ 1022 "Collect backtrace in throwable when exception happens") \ 1023 \ 1024 product(bool, OmitStackTraceInFastThrow, true, \ 1025 "Omit backtraces for some 'hot' exceptions in optimized code") \ 1026 \ 1027 product(bool, ProfilerPrintByteCodeStatistics, false, \ 1028 "Print bytecode statistics when dumping profiler output") \ 1029 \ 1030 product(bool, ProfilerRecordPC, false, \ 1031 "Collect ticks for each 16 byte interval of compiled code") \ 1032 \ 1033 product(bool, ProfileVM, false, \ 1034 "Profile ticks that fall within VM (either in the VM Thread " \ 1035 "or VM code called through stubs)") \ 1036 \ 1037 product(bool, ProfileIntervals, false, \ 1038 "Print profiles for each interval (see ProfileIntervalsTicks)") \ 1039 \ 1040 notproduct(bool, ProfilerCheckIntervals, false, \ 1041 "Collect and print information on spacing of profiler ticks") \ 1042 \ 1043 develop(bool, PrintJVMWarnings, false, \ 1044 "Print warnings for unimplemented JVM functions") \ 1045 \ 1046 product(bool, PrintWarnings, true, \ 1047 "Print JVM warnings to output stream") \ 1048 \ 1049 notproduct(uintx, WarnOnStalledSpinLock, 0, \ 1050 "Print warnings for stalled SpinLocks") \ 1051 \ 1052 product(bool, RegisterFinalizersAtInit, true, \ 1053 "Register finalizable objects at end of Object.<init> or " \ 1054 "after allocation") \ 1055 \ 1056 develop(bool, RegisterReferences, true, \ 1057 "Tell whether the VM should register soft/weak/final/phantom " \ 1058 "references") \ 1059 \ 1060 develop(bool, IgnoreRewrites, false, \ 1061 "Suppress rewrites of bytecodes in the oopmap generator. " \ 1062 "This is unsafe!") \ 1063 \ 1064 develop(bool, PrintCodeCacheExtension, false, \ 1065 "Print extension of code cache") \ 1066 \ 1067 develop(bool, UsePrivilegedStack, true, \ 1068 "Enable the security JVM functions") \ 1069 \ 1070 develop(bool, ProtectionDomainVerification, true, \ 1071 "Verify protection domain before resolution in system dictionary")\ 1072 \ 1073 product(bool, ClassUnloading, true, \ 1074 "Do unloading of classes") \ 1075 \ 1076 product(bool, ClassUnloadingWithConcurrentMark, true, \ 1077 "Do unloading of classes with a concurrent marking cycle") \ 1078 \ 1079 develop(bool, DisableStartThread, false, \ 1080 "Disable starting of additional Java threads " \ 1081 "(for debugging only)") \ 1082 \ 1083 develop(bool, MemProfiling, false, \ 1084 "Write memory usage profiling to log file") \ 1085 \ 1086 notproduct(bool, PrintSystemDictionaryAtExit, false, \ 1087 "Print the system dictionary at exit") \ 1088 \ 1089 experimental(intx, PredictedLoadedClassCount, 0, \ 1090 "Experimental: Tune loaded class cache starting size") \ 1091 \ 1092 diagnostic(bool, UnsyncloadClass, false, \ 1093 "Unstable: VM calls loadClass unsynchronized. Custom " \ 1094 "class loader must call VM synchronized for findClass " \ 1095 "and defineClass.") \ 1096 \ 1097 product(bool, AlwaysLockClassLoader, false, \ 1098 "Require the VM to acquire the class loader lock before calling " \ 1099 "loadClass() even for class loaders registering " \ 1100 "as parallel capable") \ 1101 \ 1102 product(bool, AllowParallelDefineClass, false, \ 1103 "Allow parallel defineClass requests for class loaders " \ 1104 "registering as parallel capable") \ 1105 \ 1106 product(bool, MustCallLoadClassInternal, false, \ 1107 "Call loadClassInternal() rather than loadClass()") \ 1108 \ 1109 product_pd(bool, DontYieldALot, \ 1110 "Throw away obvious excess yield calls") \ 1111 \ 1112 product_pd(bool, ConvertSleepToYield, \ 1113 "Convert sleep(0) to thread yield " \ 1114 "(may be off for Solaris to improve GUI)") \ 1115 \ 1116 product(bool, ConvertYieldToSleep, false, \ 1117 "Convert yield to a sleep of MinSleepInterval to simulate Win32 " \ 1118 "behavior") \ 1119 \ 1120 product(bool, UseBoundThreads, true, \ 1121 "Bind user level threads to kernel threads (for Solaris only)") \ 1122 \ 1123 develop(bool, UseDetachedThreads, true, \ 1124 "Use detached threads that are recycled upon termination " \ 1125 "(for Solaris only)") \ 1126 \ 1127 product(bool, UseLWPSynchronization, true, \ 1128 "Use LWP-based instead of libthread-based synchronization " \ 1129 "(SPARC only)") \ 1130 \ 1131 experimental(ccstr, SyncKnobs, NULL, \ 1132 "(Unstable) Various monitor synchronization tunables") \ 1133 \ 1134 experimental(intx, EmitSync, 0, \ 1135 "(Unsafe, Unstable) " \ 1136 "Control emission of inline sync fast-path code") \ 1137 \ 1138 product(intx, MonitorBound, 0, "Bound Monitor population") \ 1139 \ 1140 product(bool, MonitorInUseLists, false, "Track Monitors for Deflation") \ 1141 \ 1142 experimental(intx, SyncFlags, 0, "(Unsafe, Unstable) " \ 1143 "Experimental Sync flags") \ 1144 \ 1145 experimental(intx, SyncVerbose, 0, "(Unstable)") \ 1146 \ 1147 experimental(intx, ClearFPUAtPark, 0, "(Unsafe, Unstable)") \ 1148 \ 1149 experimental(intx, hashCode, 5, \ 1150 "(Unstable) select hashCode generation algorithm") \ 1151 \ 1152 experimental(intx, WorkAroundNPTLTimedWaitHang, 1, \ 1153 "(Unstable, Linux-specific) " \ 1154 "avoid NPTL-FUTEX hang pthread_cond_timedwait") \ 1155 \ 1156 product(bool, FilterSpuriousWakeups, true, \ 1157 "When true prevents OS-level spurious, or premature, wakeups " \ 1158 "from Object.wait (Ignored for Windows)") \ 1159 \ 1160 product(intx, NativeMonitorTimeout, -1, "(Unstable)") \ 1161 \ 1162 product(intx, NativeMonitorFlags, 0, "(Unstable)") \ 1163 \ 1164 product(intx, NativeMonitorSpinLimit, 20, "(Unstable)") \ 1165 \ 1166 develop(bool, UsePthreads, false, \ 1167 "Use pthread-based instead of libthread-based synchronization " \ 1168 "(SPARC only)") \ 1169 \ 1170 product(bool, AdjustConcurrency, false, \ 1171 "Call thr_setconcurrency at thread creation time to avoid " \ 1172 "LWP starvation on MP systems (for Solaris Only)") \ 1173 \ 1174 product(bool, ReduceSignalUsage, false, \ 1175 "Reduce the use of OS signals in Java and/or the VM") \ 1176 \ 1177 develop_pd(bool, ShareVtableStubs, \ 1178 "Share vtable stubs (smaller code but worse branch prediction") \ 1179 \ 1180 develop(bool, LoadLineNumberTables, true, \ 1181 "Tell whether the class file parser loads line number tables") \ 1182 \ 1183 develop(bool, LoadLocalVariableTables, true, \ 1184 "Tell whether the class file parser loads local variable tables") \ 1185 \ 1186 develop(bool, LoadLocalVariableTypeTables, true, \ 1187 "Tell whether the class file parser loads local variable type" \ 1188 "tables") \ 1189 \ 1190 product(bool, AllowUserSignalHandlers, false, \ 1191 "Do not complain if the application installs signal handlers " \ 1192 "(Solaris & Linux only)") \ 1193 \ 1194 product(bool, UseSignalChaining, true, \ 1195 "Use signal-chaining to invoke signal handlers installed " \ 1196 "by the application (Solaris & Linux only)") \ 1197 \ 1198 product(bool, UseAltSigs, false, \ 1199 "Use alternate signals instead of SIGUSR1 & SIGUSR2 for VM " \ 1200 "internal signals (Solaris only)") \ 1201 \ 1202 product(bool, AllowJNIEnvProxy, false, \ 1203 "Allow JNIEnv proxies for jdbx") \ 1204 \ 1205 product(bool, JNIDetachReleasesMonitors, true, \ 1206 "JNI DetachCurrentThread releases monitors owned by thread") \ 1207 \ 1208 product(bool, RestoreMXCSROnJNICalls, false, \ 1209 "Restore MXCSR when returning from JNI calls") \ 1210 \ 1211 product(bool, CheckJNICalls, false, \ 1212 "Verify all arguments to JNI calls") \ 1213 \ 1214 product(bool, UseFastJNIAccessors, true, \ 1215 "Use optimized versions of Get<Primitive>Field") \ 1216 \ 1217 product(intx, MaxJNILocalCapacity, 65536, \ 1218 "Maximum allowable local JNI handle capacity to " \ 1219 "EnsureLocalCapacity() and PushLocalFrame(), " \ 1220 "where <= 0 is unlimited, default: 65536") \ 1221 \ 1222 product(bool, EagerXrunInit, false, \ 1223 "Eagerly initialize -Xrun libraries; allows startup profiling, " \ 1224 "but not all -Xrun libraries may support the state of the VM " \ 1225 "at this time") \ 1226 \ 1227 product(bool, PreserveAllAnnotations, false, \ 1228 "Preserve RuntimeInvisibleAnnotations as well " \ 1229 "as RuntimeVisibleAnnotations") \ 1230 \ 1231 develop(uintx, PreallocatedOutOfMemoryErrorCount, 4, \ 1232 "Number of OutOfMemoryErrors preallocated with backtrace") \ 1233 \ 1234 product(bool, LazyBootClassLoader, true, \ 1235 "Enable/disable lazy opening of boot class path entries") \ 1236 \ 1237 product(bool, UseXMMForArrayCopy, false, \ 1238 "Use SSE2 MOVQ instruction for Arraycopy") \ 1239 \ 1240 product(intx, FieldsAllocationStyle, 1, \ 1241 "0 - type based with oops first, 1 - with oops last, " \ 1242 "2 - oops in super and sub classes are together") \ 1243 \ 1244 product(bool, CompactFields, true, \ 1245 "Allocate nonstatic fields in gaps between previous fields") \ 1246 \ 1247 notproduct(bool, PrintFieldLayout, false, \ 1248 "Print field layout for each class") \ 1249 \ 1250 product(intx, ContendedPaddingWidth, 128, \ 1251 "How many bytes to pad the fields/classes marked @Contended with")\ 1252 \ 1253 product(bool, EnableContended, true, \ 1254 "Enable @Contended annotation support") \ 1255 \ 1256 product(bool, RestrictContended, true, \ 1257 "Restrict @Contended to trusted classes") \ 1258 \ 1259 product(bool, UseBiasedLocking, true, \ 1260 "Enable biased locking in JVM") \ 1261 \ 1262 product(intx, BiasedLockingStartupDelay, 4000, \ 1263 "Number of milliseconds to wait before enabling biased locking") \ 1264 \ 1265 diagnostic(bool, PrintBiasedLockingStatistics, false, \ 1266 "Print statistics of biased locking in JVM") \ 1267 \ 1268 product(intx, BiasedLockingBulkRebiasThreshold, 20, \ 1269 "Threshold of number of revocations per type to try to " \ 1270 "rebias all objects in the heap of that type") \ 1271 \ 1272 product(intx, BiasedLockingBulkRevokeThreshold, 40, \ 1273 "Threshold of number of revocations per type to permanently " \ 1274 "revoke biases of all objects in the heap of that type") \ 1275 \ 1276 product(intx, BiasedLockingDecayTime, 25000, \ 1277 "Decay time (in milliseconds) to re-enable bulk rebiasing of a " \ 1278 "type after previous bulk rebias") \ 1279 \ 1280 /* tracing */ \ 1281 \ 1282 notproduct(bool, TraceRuntimeCalls, false, \ 1283 "Trace run-time calls") \ 1284 \ 1285 develop(bool, TraceJNICalls, false, \ 1286 "Trace JNI calls") \ 1287 \ 1288 develop(bool, StressRewriter, false, \ 1289 "Stress linktime bytecode rewriting") \ 1290 \ 1291 notproduct(bool, TraceJVMCalls, false, \ 1292 "Trace JVM calls") \ 1293 \ 1294 product(ccstr, TraceJVMTI, NULL, \ 1295 "Trace flags for JVMTI functions and events") \ 1296 \ 1297 /* This option can change an EMCP method into an obsolete method. */ \ 1298 /* This can affect tests that except specific methods to be EMCP. */ \ 1299 /* This option should be used with caution. */ \ 1300 product(bool, StressLdcRewrite, false, \ 1301 "Force ldc -> ldc_w rewrite during RedefineClasses") \ 1302 \ 1303 product(intx, TraceRedefineClasses, 0, \ 1304 "Trace level for JVMTI RedefineClasses") \ 1305 \ 1306 develop(bool, StressMethodComparator, false, \ 1307 "Run the MethodComparator on all loaded methods") \ 1308 \ 1309 /* change to false by default sometime after Mustang */ \ 1310 product(bool, VerifyMergedCPBytecodes, true, \ 1311 "Verify bytecodes after RedefineClasses constant pool merging") \ 1312 \ 1313 develop(bool, TraceJNIHandleAllocation, false, \ 1314 "Trace allocation/deallocation of JNI handle blocks") \ 1315 \ 1316 develop(bool, TraceThreadEvents, false, \ 1317 "Trace all thread events") \ 1318 \ 1319 develop(bool, TraceBytecodes, false, \ 1320 "Trace bytecode execution") \ 1321 \ 1322 develop(bool, TraceClassInitialization, false, \ 1323 "Trace class initialization") \ 1324 \ 1325 develop(bool, TraceExceptions, false, \ 1326 "Trace exceptions") \ 1327 \ 1328 develop(bool, TraceICs, false, \ 1329 "Trace inline cache changes") \ 1330 \ 1331 notproduct(bool, TraceInvocationCounterOverflow, false, \ 1332 "Trace method invocation counter overflow") \ 1333 \ 1334 develop(bool, TraceInlineCacheClearing, false, \ 1335 "Trace clearing of inline caches in nmethods") \ 1336 \ 1337 develop(bool, TraceDependencies, false, \ 1338 "Trace dependencies") \ 1339 \ 1340 develop(bool, VerifyDependencies, trueInDebug, \ 1341 "Exercise and verify the compilation dependency mechanism") \ 1342 \ 1343 develop(bool, TraceNewOopMapGeneration, false, \ 1344 "Trace OopMapGeneration") \ 1345 \ 1346 develop(bool, TraceNewOopMapGenerationDetailed, false, \ 1347 "Trace OopMapGeneration: print detailed cell states") \ 1348 \ 1349 develop(bool, TimeOopMap, false, \ 1350 "Time calls to GenerateOopMap::compute_map() in sum") \ 1351 \ 1352 develop(bool, TimeOopMap2, false, \ 1353 "Time calls to GenerateOopMap::compute_map() individually") \ 1354 \ 1355 develop(bool, TraceMonitorMismatch, false, \ 1356 "Trace monitor matching failures during OopMapGeneration") \ 1357 \ 1358 develop(bool, TraceOopMapRewrites, false, \ 1359 "Trace rewriting of method oops during oop map generation") \ 1360 \ 1361 develop(bool, TraceSafepoint, false, \ 1362 "Trace safepoint operations") \ 1363 \ 1364 develop(bool, TraceICBuffer, false, \ 1365 "Trace usage of IC buffer") \ 1366 \ 1367 develop(bool, TraceCompiledIC, false, \ 1368 "Trace changes of compiled IC") \ 1369 \ 1370 notproduct(bool, TraceZapDeadLocals, false, \ 1371 "Trace zapping dead locals") \ 1372 \ 1373 develop(bool, TraceStartupTime, false, \ 1374 "Trace setup time") \ 1375 \ 1376 develop(bool, TraceProtectionDomainVerification, false, \ 1377 "Trace protection domain verification") \ 1378 \ 1379 develop(bool, TraceClearedExceptions, false, \ 1380 "Print when an exception is forcibly cleared") \ 1381 \ 1382 product(bool, TraceClassResolution, false, \ 1383 "Trace all constant pool resolutions (for debugging)") \ 1384 \ 1385 product(bool, TraceBiasedLocking, false, \ 1386 "Trace biased locking in JVM") \ 1387 \ 1388 product(bool, TraceMonitorInflation, false, \ 1389 "Trace monitor inflation in JVM") \ 1390 \ 1391 /* gc */ \ 1392 \ 1393 product(bool, UseSerialGC, false, \ 1394 "Use the Serial garbage collector") \ 1395 \ 1396 product(bool, UseG1GC, false, \ 1397 "Use the Garbage-First garbage collector") \ 1398 \ 1399 product(bool, UseParallelGC, false, \ 1400 "Use the Parallel Scavenge garbage collector") \ 1401 \ 1402 product(bool, UseParallelOldGC, false, \ 1403 "Use the Parallel Old garbage collector") \ 1404 \ 1405 product(uintx, HeapMaximumCompactionInterval, 20, \ 1406 "How often should we maximally compact the heap (not allowing " \ 1407 "any dead space)") \ 1408 \ 1409 product(uintx, HeapFirstMaximumCompactionCount, 3, \ 1410 "The collection count for the first maximum compaction") \ 1411 \ 1412 product(bool, UseMaximumCompactionOnSystemGC, true, \ 1413 "Use maximum compaction in the Parallel Old garbage collector " \ 1414 "for a system GC") \ 1415 \ 1416 product(uintx, ParallelOldDeadWoodLimiterMean, 50, \ 1417 "The mean used by the parallel compact dead wood " \ 1418 "limiter (a number between 0-100)") \ 1419 \ 1420 product(uintx, ParallelOldDeadWoodLimiterStdDev, 80, \ 1421 "The standard deviation used by the parallel compact dead wood " \ 1422 "limiter (a number between 0-100)") \ 1423 \ 1424 product(uintx, ParallelGCThreads, 0, \ 1425 "Number of parallel threads parallel gc will use") \ 1426 \ 1427 product(bool, UseDynamicNumberOfGCThreads, false, \ 1428 "Dynamically choose the number of parallel threads " \ 1429 "parallel gc will use") \ 1430 \ 1431 diagnostic(bool, ForceDynamicNumberOfGCThreads, false, \ 1432 "Force dynamic selection of the number of " \ 1433 "parallel threads parallel gc will use to aid debugging") \ 1434 \ 1435 product(uintx, HeapSizePerGCThread, ScaleForWordSize(64*M), \ 1436 "Size of heap (bytes) per GC thread used in calculating the " \ 1437 "number of GC threads") \ 1438 \ 1439 product(bool, TraceDynamicGCThreads, false, \ 1440 "Trace the dynamic GC thread usage") \ 1441 \ 1442 develop(bool, ParallelOldGCSplitALot, false, \ 1443 "Provoke splitting (copying data from a young gen space to " \ 1444 "multiple destination spaces)") \ 1445 \ 1446 develop(uintx, ParallelOldGCSplitInterval, 3, \ 1447 "How often to provoke splitting a young gen space") \ 1448 \ 1449 product(uintx, ConcGCThreads, 0, \ 1450 "Number of threads concurrent gc will use") \ 1451 \ 1452 product(uintx, YoungPLABSize, 4096, \ 1453 "Size of young gen promotion LAB's (in HeapWords)") \ 1454 \ 1455 product(uintx, OldPLABSize, 1024, \ 1456 "Size of old gen promotion LAB's (in HeapWords)") \ 1457 \ 1458 product(uintx, GCTaskTimeStampEntries, 200, \ 1459 "Number of time stamp entries per gc worker thread") \ 1460 \ 1461 product(bool, AlwaysTenure, false, \ 1462 "Always tenure objects in eden (ParallelGC only)") \ 1463 \ 1464 product(bool, NeverTenure, false, \ 1465 "Never tenure objects in eden, may tenure on overflow " \ 1466 "(ParallelGC only)") \ 1467 \ 1468 product(bool, ScavengeBeforeFullGC, true, \ 1469 "Scavenge youngest generation before each full GC.") \ 1470 \ 1471 develop(bool, ScavengeWithObjectsInToSpace, false, \ 1472 "Allow scavenges to occur when to-space contains objects") \ 1473 \ 1474 product(bool, UseConcMarkSweepGC, false, \ 1475 "Use Concurrent Mark-Sweep GC in the old generation") \ 1476 \ 1477 product(bool, ExplicitGCInvokesConcurrent, false, \ 1478 "A System.gc() request invokes a concurrent collection; " \ 1479 "(effective only when UseConcMarkSweepGC)") \ 1480 \ 1481 product(bool, ExplicitGCInvokesConcurrentAndUnloadsClasses, false, \ 1482 "A System.gc() request invokes a concurrent collection and " \ 1483 "also unloads classes during such a concurrent gc cycle " \ 1484 "(effective only when UseConcMarkSweepGC)") \ 1485 \ 1486 product(bool, GCLockerInvokesConcurrent, false, \ 1487 "The exit of a JNI critical section necessitating a scavenge, " \ 1488 "also kicks off a background concurrent collection") \ 1489 \ 1490 product(uintx, GCLockerEdenExpansionPercent, 5, \ 1491 "How much the GC can expand the eden by while the GC locker " \ 1492 "is active (as a percentage)") \ 1493 \ 1494 diagnostic(intx, GCLockerRetryAllocationCount, 2, \ 1495 "Number of times to retry allocations when " \ 1496 "blocked by the GC locker") \ 1497 \ 1498 develop(bool, UseCMSAdaptiveFreeLists, true, \ 1499 "Use adaptive free lists in the CMS generation") \ 1500 \ 1501 develop(bool, UseAsyncConcMarkSweepGC, true, \ 1502 "Use Asynchronous Concurrent Mark-Sweep GC in the old generation")\ 1503 \ 1504 develop(bool, RotateCMSCollectionTypes, false, \ 1505 "Rotate the CMS collections among concurrent and STW") \ 1506 \ 1507 product(bool, UseCMSBestFit, true, \ 1508 "Use CMS best fit allocation strategy") \ 1509 \ 1510 product(bool, UseCMSCollectionPassing, true, \ 1511 "Use passing of collection from background to foreground") \ 1512 \ 1513 product(bool, UseParNewGC, false, \ 1514 "Use parallel threads in the new generation") \ 1515 \ 1516 product(bool, ParallelGCVerbose, false, \ 1517 "Verbose output for parallel gc") \ 1518 \ 1519 product(uintx, ParallelGCBufferWastePct, 10, \ 1520 "Wasted fraction of parallel allocation buffer") \ 1521 \ 1522 diagnostic(bool, ParallelGCRetainPLAB, false, \ 1523 "Retain parallel allocation buffers across scavenges; " \ 1524 "it is disabled because this currently conflicts with " \ 1525 "parallel card scanning under certain conditions.") \ 1526 \ 1527 product(uintx, TargetPLABWastePct, 10, \ 1528 "Target wasted space in last buffer as percent of overall " \ 1529 "allocation") \ 1530 \ 1531 product(uintx, PLABWeight, 75, \ 1532 "Percentage (0-100) used to weight the current sample when " \ 1533 "computing exponentially decaying average for ResizePLAB") \ 1534 \ 1535 product(bool, ResizePLAB, true, \ 1536 "Dynamically resize (survivor space) promotion LAB's") \ 1537 \ 1538 product(bool, PrintPLAB, false, \ 1539 "Print (survivor space) promotion LAB's sizing decisions") \ 1540 \ 1541 product(intx, ParGCArrayScanChunk, 50, \ 1542 "Scan a subset of object array and push remainder, if array is " \ 1543 "bigger than this") \ 1544 \ 1545 product(bool, ParGCUseLocalOverflow, false, \ 1546 "Instead of a global overflow list, use local overflow stacks") \ 1547 \ 1548 product(bool, ParGCTrimOverflow, true, \ 1549 "Eagerly trim the local overflow lists " \ 1550 "(when ParGCUseLocalOverflow)") \ 1551 \ 1552 notproduct(bool, ParGCWorkQueueOverflowALot, false, \ 1553 "Simulate work queue overflow in ParNew") \ 1554 \ 1555 notproduct(uintx, ParGCWorkQueueOverflowInterval, 1000, \ 1556 "An `interval' counter that determines how frequently " \ 1557 "we simulate overflow; a smaller number increases frequency") \ 1558 \ 1559 product(uintx, ParGCDesiredObjsFromOverflowList, 20, \ 1560 "The desired number of objects to claim from the overflow list") \ 1561 \ 1562 diagnostic(uintx, ParGCStridesPerThread, 2, \ 1563 "The number of strides per worker thread that we divide up the " \ 1564 "card table scanning work into") \ 1565 \ 1566 diagnostic(intx, ParGCCardsPerStrideChunk, 256, \ 1567 "The number of cards in each chunk of the parallel chunks used " \ 1568 "during card table scanning") \ 1569 \ 1570 product(uintx, CMSParPromoteBlocksToClaim, 16, \ 1571 "Number of blocks to attempt to claim when refilling CMS LAB's " \ 1572 "for parallel GC") \ 1573 \ 1574 product(uintx, OldPLABWeight, 50, \ 1575 "Percentage (0-100) used to weight the current sample when " \ 1576 "computing exponentially decaying average for resizing " \ 1577 "CMSParPromoteBlocksToClaim") \ 1578 \ 1579 product(bool, ResizeOldPLAB, true, \ 1580 "Dynamically resize (old gen) promotion LAB's") \ 1581 \ 1582 product(bool, PrintOldPLAB, false, \ 1583 "Print (old gen) promotion LAB's sizing decisions") \ 1584 \ 1585 product(uintx, CMSOldPLABMin, 16, \ 1586 "Minimum size of CMS gen promotion LAB caches per worker " \ 1587 "per block size") \ 1588 \ 1589 product(uintx, CMSOldPLABMax, 1024, \ 1590 "Maximum size of CMS gen promotion LAB caches per worker " \ 1591 "per block size") \ 1592 \ 1593 product(uintx, CMSOldPLABNumRefills, 4, \ 1594 "Nominal number of refills of CMS gen promotion LAB cache " \ 1595 "per worker per block size") \ 1596 \ 1597 product(bool, CMSOldPLABResizeQuicker, false, \ 1598 "React on-the-fly during a scavenge to a sudden " \ 1599 "change in block demand rate") \ 1600 \ 1601 product(uintx, CMSOldPLABToleranceFactor, 4, \ 1602 "The tolerance of the phase-change detector for on-the-fly " \ 1603 "PLAB resizing during a scavenge") \ 1604 \ 1605 product(uintx, CMSOldPLABReactivityFactor, 2, \ 1606 "The gain in the feedback loop for on-the-fly PLAB resizing " \ 1607 "during a scavenge") \ 1608 \ 1609 product(bool, AlwaysPreTouch, false, \ 1610 "Force all freshly committed pages to be pre-touched") \ 1611 \ 1612 product_pd(uintx, CMSYoungGenPerWorker, \ 1613 "The maximum size of young gen chosen by default per GC worker " \ 1614 "thread available") \ 1615 \ 1616 product(bool, CMSIncrementalMode, false, \ 1617 "Whether CMS GC should operate in \"incremental\" mode") \ 1618 \ 1619 product(uintx, CMSIncrementalDutyCycle, 10, \ 1620 "Percentage (0-100) of CMS incremental mode duty cycle. If " \ 1621 "CMSIncrementalPacing is enabled, then this is just the initial " \ 1622 "value.") \ 1623 \ 1624 product(bool, CMSIncrementalPacing, true, \ 1625 "Whether the CMS incremental mode duty cycle should be " \ 1626 "automatically adjusted") \ 1627 \ 1628 product(uintx, CMSIncrementalDutyCycleMin, 0, \ 1629 "Minimum percentage (0-100) of the CMS incremental duty cycle " \ 1630 "used when CMSIncrementalPacing is enabled") \ 1631 \ 1632 product(uintx, CMSIncrementalSafetyFactor, 10, \ 1633 "Percentage (0-100) used to add conservatism when computing the " \ 1634 "duty cycle") \ 1635 \ 1636 product(uintx, CMSIncrementalOffset, 0, \ 1637 "Percentage (0-100) by which the CMS incremental mode duty cycle "\ 1638 "is shifted to the right within the period between young GCs") \ 1639 \ 1640 product(uintx, CMSExpAvgFactor, 50, \ 1641 "Percentage (0-100) used to weight the current sample when " \ 1642 "computing exponential averages for CMS statistics") \ 1643 \ 1644 product(uintx, CMS_FLSWeight, 75, \ 1645 "Percentage (0-100) used to weight the current sample when " \ 1646 "computing exponentially decaying averages for CMS FLS " \ 1647 "statistics") \ 1648 \ 1649 product(uintx, CMS_FLSPadding, 1, \ 1650 "The multiple of deviation from mean to use for buffering " \ 1651 "against volatility in free list demand") \ 1652 \ 1653 product(uintx, FLSCoalescePolicy, 2, \ 1654 "CMS: aggressiveness level for coalescing, increasing " \ 1655 "from 0 to 4") \ 1656 \ 1657 product(bool, FLSAlwaysCoalesceLarge, false, \ 1658 "CMS: larger free blocks are always available for coalescing") \ 1659 \ 1660 product(double, FLSLargestBlockCoalesceProximity, 0.99, \ 1661 "CMS: the smaller the percentage the greater the coalescing " \ 1662 "force") \ 1663 \ 1664 product(double, CMSSmallCoalSurplusPercent, 1.05, \ 1665 "CMS: the factor by which to inflate estimated demand of small " \ 1666 "block sizes to prevent coalescing with an adjoining block") \ 1667 \ 1668 product(double, CMSLargeCoalSurplusPercent, 0.95, \ 1669 "CMS: the factor by which to inflate estimated demand of large " \ 1670 "block sizes to prevent coalescing with an adjoining block") \ 1671 \ 1672 product(double, CMSSmallSplitSurplusPercent, 1.10, \ 1673 "CMS: the factor by which to inflate estimated demand of small " \ 1674 "block sizes to prevent splitting to supply demand for smaller " \ 1675 "blocks") \ 1676 \ 1677 product(double, CMSLargeSplitSurplusPercent, 1.00, \ 1678 "CMS: the factor by which to inflate estimated demand of large " \ 1679 "block sizes to prevent splitting to supply demand for smaller " \ 1680 "blocks") \ 1681 \ 1682 product(bool, CMSExtrapolateSweep, false, \ 1683 "CMS: cushion for block demand during sweep") \ 1684 \ 1685 product(uintx, CMS_SweepWeight, 75, \ 1686 "Percentage (0-100) used to weight the current sample when " \ 1687 "computing exponentially decaying average for inter-sweep " \ 1688 "duration") \ 1689 \ 1690 product(uintx, CMS_SweepPadding, 1, \ 1691 "The multiple of deviation from mean to use for buffering " \ 1692 "against volatility in inter-sweep duration") \ 1693 \ 1694 product(uintx, CMS_SweepTimerThresholdMillis, 10, \ 1695 "Skip block flux-rate sampling for an epoch unless inter-sweep " \ 1696 "duration exceeds this threshold in milliseconds") \ 1697 \ 1698 develop(bool, CMSTraceIncrementalMode, false, \ 1699 "Trace CMS incremental mode") \ 1700 \ 1701 develop(bool, CMSTraceIncrementalPacing, false, \ 1702 "Trace CMS incremental mode pacing computation") \ 1703 \ 1704 develop(bool, CMSTraceThreadState, false, \ 1705 "Trace the CMS thread state (enable the trace_state() method)") \ 1706 \ 1707 product(bool, CMSClassUnloadingEnabled, true, \ 1708 "Whether class unloading enabled when using CMS GC") \ 1709 \ 1710 product(uintx, CMSClassUnloadingMaxInterval, 0, \ 1711 "When CMS class unloading is enabled, the maximum CMS cycle " \ 1712 "count for which classes may not be unloaded") \ 1713 \ 1714 product(bool, CMSCompactWhenClearAllSoftRefs, true, \ 1715 "Compact when asked to collect CMS gen with " \ 1716 "clear_all_soft_refs()") \ 1717 \ 1718 product(bool, UseCMSCompactAtFullCollection, true, \ 1719 "Use Mark-Sweep-Compact algorithm at full collections") \ 1720 \ 1721 product(uintx, CMSFullGCsBeforeCompaction, 0, \ 1722 "Number of CMS full collection done before compaction if > 0") \ 1723 \ 1724 develop(intx, CMSDictionaryChoice, 0, \ 1725 "Use BinaryTreeDictionary as default in the CMS generation") \ 1726 \ 1727 product(uintx, CMSIndexedFreeListReplenish, 4, \ 1728 "Replenish an indexed free list with this number of chunks") \ 1729 \ 1730 product(bool, CMSReplenishIntermediate, true, \ 1731 "Replenish all intermediate free-list caches") \ 1732 \ 1733 product(bool, CMSSplitIndexedFreeListBlocks, true, \ 1734 "When satisfying batched demand, split blocks from the " \ 1735 "IndexedFreeList whose size is a multiple of requested size") \ 1736 \ 1737 product(bool, CMSLoopWarn, false, \ 1738 "Warn in case of excessive CMS looping") \ 1739 \ 1740 develop(bool, CMSOverflowEarlyRestoration, false, \ 1741 "Restore preserved marks early") \ 1742 \ 1743 product(uintx, MarkStackSize, NOT_LP64(32*K) LP64_ONLY(4*M), \ 1744 "Size of marking stack") \ 1745 \ 1746 product(uintx, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \ 1747 "Maximum size of marking stack") \ 1748 \ 1749 notproduct(bool, CMSMarkStackOverflowALot, false, \ 1750 "Simulate frequent marking stack / work queue overflow") \ 1751 \ 1752 notproduct(uintx, CMSMarkStackOverflowInterval, 1000, \ 1753 "An \"interval\" counter that determines how frequently " \ 1754 "to simulate overflow; a smaller number increases frequency") \ 1755 \ 1756 product(uintx, CMSMaxAbortablePrecleanLoops, 0, \ 1757 "Maximum number of abortable preclean iterations, if > 0") \ 1758 \ 1759 product(intx, CMSMaxAbortablePrecleanTime, 5000, \ 1760 "Maximum time in abortable preclean (in milliseconds)") \ 1761 \ 1762 product(uintx, CMSAbortablePrecleanMinWorkPerIteration, 100, \ 1763 "Nominal minimum work per abortable preclean iteration") \ 1764 \ 1765 manageable(intx, CMSAbortablePrecleanWaitMillis, 100, \ 1766 "Time that we sleep between iterations when not given " \ 1767 "enough work per iteration") \ 1768 \ 1769 product(uintx, CMSRescanMultiple, 32, \ 1770 "Size (in cards) of CMS parallel rescan task") \ 1771 \ 1772 product(uintx, CMSConcMarkMultiple, 32, \ 1773 "Size (in cards) of CMS concurrent MT marking task") \ 1774 \ 1775 product(bool, CMSAbortSemantics, false, \ 1776 "Whether abort-on-overflow semantics is implemented") \ 1777 \ 1778 product(bool, CMSParallelInitialMarkEnabled, true, \ 1779 "Use the parallel initial mark.") \ 1780 \ 1781 product(bool, CMSParallelRemarkEnabled, true, \ 1782 "Whether parallel remark enabled (only if ParNewGC)") \ 1783 \ 1784 product(bool, CMSParallelSurvivorRemarkEnabled, true, \ 1785 "Whether parallel remark of survivor space " \ 1786 "enabled (effective only if CMSParallelRemarkEnabled)") \ 1787 \ 1788 product(bool, CMSPLABRecordAlways, true, \ 1789 "Always record survivor space PLAB boundaries (effective only " \ 1790 "if CMSParallelSurvivorRemarkEnabled)") \ 1791 \ 1792 product(bool, CMSEdenChunksRecordAlways, true, \ 1793 "Always record eden chunks used for the parallel initial mark " \ 1794 "or remark of eden") \ 1795 \ 1796 product(bool, CMSPrintEdenSurvivorChunks, false, \ 1797 "Print the eden and the survivor chunks used for the parallel " \ 1798 "initial mark or remark of the eden/survivor spaces") \ 1799 \ 1800 product(bool, CMSConcurrentMTEnabled, true, \ 1801 "Whether multi-threaded concurrent work enabled " \ 1802 "(effective only if ParNewGC)") \ 1803 \ 1804 product(bool, CMSPrecleaningEnabled, true, \ 1805 "Whether concurrent precleaning enabled") \ 1806 \ 1807 product(uintx, CMSPrecleanIter, 3, \ 1808 "Maximum number of precleaning iteration passes") \ 1809 \ 1810 product(uintx, CMSPrecleanNumerator, 2, \ 1811 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1812 "ratio") \ 1813 \ 1814 product(uintx, CMSPrecleanDenominator, 3, \ 1815 "CMSPrecleanNumerator:CMSPrecleanDenominator yields convergence " \ 1816 "ratio") \ 1817 \ 1818 product(bool, CMSPrecleanRefLists1, true, \ 1819 "Preclean ref lists during (initial) preclean phase") \ 1820 \ 1821 product(bool, CMSPrecleanRefLists2, false, \ 1822 "Preclean ref lists during abortable preclean phase") \ 1823 \ 1824 product(bool, CMSPrecleanSurvivors1, false, \ 1825 "Preclean survivors during (initial) preclean phase") \ 1826 \ 1827 product(bool, CMSPrecleanSurvivors2, true, \ 1828 "Preclean survivors during abortable preclean phase") \ 1829 \ 1830 product(uintx, CMSPrecleanThreshold, 1000, \ 1831 "Do not iterate again if number of dirty cards is less than this")\ 1832 \ 1833 product(bool, CMSCleanOnEnter, true, \ 1834 "Clean-on-enter optimization for reducing number of dirty cards") \ 1835 \ 1836 product(uintx, CMSRemarkVerifyVariant, 1, \ 1837 "Choose variant (1,2) of verification following remark") \ 1838 \ 1839 product(uintx, CMSScheduleRemarkEdenSizeThreshold, 2*M, \ 1840 "If Eden size is below this, do not try to schedule remark") \ 1841 \ 1842 product(uintx, CMSScheduleRemarkEdenPenetration, 50, \ 1843 "The Eden occupancy percentage (0-100) at which " \ 1844 "to try and schedule remark pause") \ 1845 \ 1846 product(uintx, CMSScheduleRemarkSamplingRatio, 5, \ 1847 "Start sampling eden top at least before young gen " \ 1848 "occupancy reaches 1/<ratio> of the size at which " \ 1849 "we plan to schedule remark") \ 1850 \ 1851 product(uintx, CMSSamplingGrain, 16*K, \ 1852 "The minimum distance between eden samples for CMS (see above)") \ 1853 \ 1854 product(bool, CMSScavengeBeforeRemark, false, \ 1855 "Attempt scavenge before the CMS remark step") \ 1856 \ 1857 develop(bool, CMSTraceSweeper, false, \ 1858 "Trace some actions of the CMS sweeper") \ 1859 \ 1860 product(uintx, CMSWorkQueueDrainThreshold, 10, \ 1861 "Don't drain below this size per parallel worker/thief") \ 1862 \ 1863 manageable(intx, CMSWaitDuration, 2000, \ 1864 "Time in milliseconds that CMS thread waits for young GC") \ 1865 \ 1866 develop(uintx, CMSCheckInterval, 1000, \ 1867 "Interval in milliseconds that CMS thread checks if it " \ 1868 "should start a collection cycle") \ 1869 \ 1870 product(bool, CMSYield, true, \ 1871 "Yield between steps of CMS") \ 1872 \ 1873 product(uintx, CMSBitMapYieldQuantum, 10*M, \ 1874 "Bitmap operations should process at most this many bits " \ 1875 "between yields") \ 1876 \ 1877 product(bool, CMSDumpAtPromotionFailure, false, \ 1878 "Dump useful information about the state of the CMS old " \ 1879 "generation upon a promotion failure") \ 1880 \ 1881 product(bool, CMSPrintChunksInDump, false, \ 1882 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1883 "more detailed information about the free chunks") \ 1884 \ 1885 product(bool, CMSPrintObjectsInDump, false, \ 1886 "In a dump enabled by CMSDumpAtPromotionFailure, include " \ 1887 "more detailed information about the allocated objects") \ 1888 \ 1889 diagnostic(bool, FLSVerifyAllHeapReferences, false, \ 1890 "Verify that all references across the FLS boundary " \ 1891 "are to valid objects") \ 1892 \ 1893 diagnostic(bool, FLSVerifyLists, false, \ 1894 "Do lots of (expensive) FreeListSpace verification") \ 1895 \ 1896 diagnostic(bool, FLSVerifyIndexTable, false, \ 1897 "Do lots of (expensive) FLS index table verification") \ 1898 \ 1899 develop(bool, FLSVerifyDictionary, false, \ 1900 "Do lots of (expensive) FLS dictionary verification") \ 1901 \ 1902 develop(bool, VerifyBlockOffsetArray, false, \ 1903 "Do (expensive) block offset array verification") \ 1904 \ 1905 diagnostic(bool, BlockOffsetArrayUseUnallocatedBlock, false, \ 1906 "Maintain _unallocated_block in BlockOffsetArray " \ 1907 "(currently applicable only to CMS collector)") \ 1908 \ 1909 develop(bool, TraceCMSState, false, \ 1910 "Trace the state of the CMS collection") \ 1911 \ 1912 product(intx, RefDiscoveryPolicy, 0, \ 1913 "Select type of reference discovery policy: " \ 1914 "reference-based(0) or referent-based(1)") \ 1915 \ 1916 product(bool, ParallelRefProcEnabled, false, \ 1917 "Enable parallel reference processing whenever possible") \ 1918 \ 1919 product(bool, ParallelRefProcBalancingEnabled, true, \ 1920 "Enable balancing of reference processing queues") \ 1921 \ 1922 product(uintx, CMSTriggerRatio, 80, \ 1923 "Percentage of MinHeapFreeRatio in CMS generation that is " \ 1924 "allocated before a CMS collection cycle commences") \ 1925 \ 1926 product(uintx, CMSBootstrapOccupancy, 50, \ 1927 "Percentage CMS generation occupancy at which to " \ 1928 "initiate CMS collection for bootstrapping collection stats") \ 1929 \ 1930 product(intx, CMSInitiatingOccupancyFraction, -1, \ 1931 "Percentage CMS generation occupancy to start a CMS collection " \ 1932 "cycle. A negative value means that CMSTriggerRatio is used") \ 1933 \ 1934 product(uintx, InitiatingHeapOccupancyPercent, 45, \ 1935 "Percentage of the (entire) heap occupancy to start a " \ 1936 "concurrent GC cycle. It is used by GCs that trigger a " \ 1937 "concurrent GC cycle based on the occupancy of the entire heap, " \ 1938 "not just one of the generations (e.g., G1). A value of 0 " \ 1939 "denotes 'do constant GC cycles'.") \ 1940 \ 1941 manageable(intx, CMSTriggerInterval, -1, \ 1942 "Commence a CMS collection cycle (at least) every so many " \ 1943 "milliseconds (0 permanently, -1 disabled)") \ 1944 \ 1945 product(bool, UseCMSInitiatingOccupancyOnly, false, \ 1946 "Only use occupancy as a criterion for starting a CMS collection")\ 1947 \ 1948 product(uintx, CMSIsTooFullPercentage, 98, \ 1949 "An absolute ceiling above which CMS will always consider the " \ 1950 "unloading of classes when class unloading is enabled") \ 1951 \ 1952 develop(bool, CMSTestInFreeList, false, \ 1953 "Check if the coalesced range is already in the " \ 1954 "free lists as claimed") \ 1955 \ 1956 notproduct(bool, CMSVerifyReturnedBytes, false, \ 1957 "Check that all the garbage collected was returned to the " \ 1958 "free lists") \ 1959 \ 1960 notproduct(bool, ScavengeALot, false, \ 1961 "Force scavenge at every Nth exit from the runtime system " \ 1962 "(N=ScavengeALotInterval)") \ 1963 \ 1964 develop(bool, FullGCALot, false, \ 1965 "Force full gc at every Nth exit from the runtime system " \ 1966 "(N=FullGCALotInterval)") \ 1967 \ 1968 notproduct(bool, GCALotAtAllSafepoints, false, \ 1969 "Enforce ScavengeALot/GCALot at all potential safepoints") \ 1970 \ 1971 product(bool, PrintPromotionFailure, false, \ 1972 "Print additional diagnostic information following " \ 1973 "promotion failure") \ 1974 \ 1975 notproduct(bool, PromotionFailureALot, false, \ 1976 "Use promotion failure handling on every youngest generation " \ 1977 "collection") \ 1978 \ 1979 develop(uintx, PromotionFailureALotCount, 1000, \ 1980 "Number of promotion failures occurring at ParGCAllocBuffer " \ 1981 "refill attempts (ParNew) or promotion attempts " \ 1982 "(other young collectors)") \ 1983 \ 1984 develop(uintx, PromotionFailureALotInterval, 5, \ 1985 "Total collections between promotion failures a lot") \ 1986 \ 1987 experimental(uintx, WorkStealingSleepMillis, 1, \ 1988 "Sleep time when sleep is used for yields") \ 1989 \ 1990 experimental(uintx, WorkStealingYieldsBeforeSleep, 5000, \ 1991 "Number of yields before a sleep is done during work stealing") \ 1992 \ 1993 experimental(uintx, WorkStealingHardSpins, 4096, \ 1994 "Number of iterations in a spin loop between checks on " \ 1995 "time out of hard spin") \ 1996 \ 1997 experimental(uintx, WorkStealingSpinToYieldRatio, 10, \ 1998 "Ratio of hard spins to calls to yield") \ 1999 \ 2000 develop(uintx, ObjArrayMarkingStride, 512, \ 2001 "Number of object array elements to push onto the marking stack " \ 2002 "before pushing a continuation entry") \ 2003 \ 2004 develop(bool, MetadataAllocationFailALot, false, \ 2005 "Fail metadata allocations at intervals controlled by " \ 2006 "MetadataAllocationFailALotInterval") \ 2007 \ 2008 develop(uintx, MetadataAllocationFailALotInterval, 1000, \ 2009 "Metadata allocation failure a lot interval") \ 2010 \ 2011 develop(bool, TraceMetadataChunkAllocation, false, \ 2012 "Trace chunk metadata allocations") \ 2013 \ 2014 product(bool, TraceMetadataHumongousAllocation, false, \ 2015 "Trace humongous metadata allocations") \ 2016 \ 2017 develop(bool, TraceMetavirtualspaceAllocation, false, \ 2018 "Trace virtual space metadata allocations") \ 2019 \ 2020 notproduct(bool, ExecuteInternalVMTests, false, \ 2021 "Enable execution of internal VM tests") \ 2022 \ 2023 notproduct(bool, VerboseInternalVMTests, false, \ 2024 "Turn on logging for internal VM tests.") \ 2025 \ 2026 product_pd(bool, UseTLAB, "Use thread-local object allocation") \ 2027 \ 2028 product_pd(bool, ResizeTLAB, \ 2029 "Dynamically resize TLAB size for threads") \ 2030 \ 2031 product(bool, ZeroTLAB, false, \ 2032 "Zero out the newly created TLAB") \ 2033 \ 2034 product(bool, FastTLABRefill, true, \ 2035 "Use fast TLAB refill code") \ 2036 \ 2037 product(bool, PrintTLAB, false, \ 2038 "Print various TLAB related information") \ 2039 \ 2040 product(bool, TLABStats, true, \ 2041 "Provide more detailed and expensive TLAB statistics " \ 2042 "(with PrintTLAB)") \ 2043 \ 2044 EMBEDDED_ONLY(product(bool, LowMemoryProtection, true, \ 2045 "Enable LowMemoryProtection")) \ 2046 \ 2047 product_pd(bool, NeverActAsServerClassMachine, \ 2048 "Never act like a server-class machine") \ 2049 \ 2050 product(bool, AlwaysActAsServerClassMachine, false, \ 2051 "Always act like a server-class machine") \ 2052 \ 2053 product_pd(uint64_t, MaxRAM, \ 2054 "Real memory size (in bytes) used to set maximum heap size") \ 2055 \ 2056 product(uintx, ErgoHeapSizeLimit, 0, \ 2057 "Maximum ergonomically set heap size (in bytes); zero means use " \ 2058 "MaxRAM / MaxRAMFraction") \ 2059 \ 2060 product(uintx, MaxRAMFraction, 4, \ 2061 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2062 "size") \ 2063 \ 2064 product(uintx, DefaultMaxRAMFraction, 4, \ 2065 "Maximum fraction (1/n) of real memory used for maximum heap " \ 2066 "size; deprecated: to be renamed to MaxRAMFraction") \ 2067 \ 2068 product(uintx, MinRAMFraction, 2, \ 2069 "Minimum fraction (1/n) of real memory used for maximum heap " \ 2070 "size on systems with small physical memory size") \ 2071 \ 2072 product(uintx, InitialRAMFraction, 64, \ 2073 "Fraction (1/n) of real memory used for initial heap size") \ 2074 \ 2075 develop(uintx, MaxVirtMemFraction, 2, \ 2076 "Maximum fraction (1/n) of virtual memory used for ergonomically "\ 2077 "determining maximum heap size") \ 2078 \ 2079 product(bool, UseAutoGCSelectPolicy, false, \ 2080 "Use automatic collection selection policy") \ 2081 \ 2082 product(uintx, AutoGCSelectPauseMillis, 5000, \ 2083 "Automatic GC selection pause threshold in milliseconds") \ 2084 \ 2085 product(bool, UseAdaptiveSizePolicy, true, \ 2086 "Use adaptive generation sizing policies") \ 2087 \ 2088 product(bool, UsePSAdaptiveSurvivorSizePolicy, true, \ 2089 "Use adaptive survivor sizing policies") \ 2090 \ 2091 product(bool, UseAdaptiveGenerationSizePolicyAtMinorCollection, true, \ 2092 "Use adaptive young-old sizing policies at minor collections") \ 2093 \ 2094 product(bool, UseAdaptiveGenerationSizePolicyAtMajorCollection, true, \ 2095 "Use adaptive young-old sizing policies at major collections") \ 2096 \ 2097 product(bool, UseAdaptiveSizePolicyWithSystemGC, false, \ 2098 "Include statistics from System.gc() for adaptive size policy") \ 2099 \ 2100 product(bool, UseAdaptiveGCBoundary, false, \ 2101 "Allow young-old boundary to move") \ 2102 \ 2103 develop(bool, TraceAdaptiveGCBoundary, false, \ 2104 "Trace young-old boundary moves") \ 2105 \ 2106 develop(intx, PSAdaptiveSizePolicyResizeVirtualSpaceAlot, -1, \ 2107 "Resize the virtual spaces of the young or old generations") \ 2108 \ 2109 product(uintx, AdaptiveSizeThroughPutPolicy, 0, \ 2110 "Policy for changing generation size for throughput goals") \ 2111 \ 2112 product(uintx, AdaptiveSizePausePolicy, 0, \ 2113 "Policy for changing generation size for pause goals") \ 2114 \ 2115 develop(bool, PSAdjustTenuredGenForMinorPause, false, \ 2116 "Adjust tenured generation to achieve a minor pause goal") \ 2117 \ 2118 develop(bool, PSAdjustYoungGenForMajorPause, false, \ 2119 "Adjust young generation to achieve a major pause goal") \ 2120 \ 2121 product(uintx, AdaptiveSizePolicyInitializingSteps, 20, \ 2122 "Number of steps where heuristics is used before data is used") \ 2123 \ 2124 develop(uintx, AdaptiveSizePolicyReadyThreshold, 5, \ 2125 "Number of collections before the adaptive sizing is started") \ 2126 \ 2127 product(uintx, AdaptiveSizePolicyOutputInterval, 0, \ 2128 "Collection interval for printing information; zero means never") \ 2129 \ 2130 product(bool, UseAdaptiveSizePolicyFootprintGoal, true, \ 2131 "Use adaptive minimum footprint as a goal") \ 2132 \ 2133 product(uintx, AdaptiveSizePolicyWeight, 10, \ 2134 "Weight given to exponential resizing, between 0 and 100") \ 2135 \ 2136 product(uintx, AdaptiveTimeWeight, 25, \ 2137 "Weight given to time in adaptive policy, between 0 and 100") \ 2138 \ 2139 product(uintx, PausePadding, 1, \ 2140 "How much buffer to keep for pause time") \ 2141 \ 2142 product(uintx, PromotedPadding, 3, \ 2143 "How much buffer to keep for promotion failure") \ 2144 \ 2145 product(uintx, SurvivorPadding, 3, \ 2146 "How much buffer to keep for survivor overflow") \ 2147 \ 2148 product(uintx, ThresholdTolerance, 10, \ 2149 "Allowed collection cost difference between generations") \ 2150 \ 2151 product(uintx, AdaptiveSizePolicyCollectionCostMargin, 50, \ 2152 "If collection costs are within margin, reduce both by full " \ 2153 "delta") \ 2154 \ 2155 product(uintx, YoungGenerationSizeIncrement, 20, \ 2156 "Adaptive size percentage change in young generation") \ 2157 \ 2158 product(uintx, YoungGenerationSizeSupplement, 80, \ 2159 "Supplement to YoungedGenerationSizeIncrement used at startup") \ 2160 \ 2161 product(uintx, YoungGenerationSizeSupplementDecay, 8, \ 2162 "Decay factor to YoungedGenerationSizeSupplement") \ 2163 \ 2164 product(uintx, TenuredGenerationSizeIncrement, 20, \ 2165 "Adaptive size percentage change in tenured generation") \ 2166 \ 2167 product(uintx, TenuredGenerationSizeSupplement, 80, \ 2168 "Supplement to TenuredGenerationSizeIncrement used at startup") \ 2169 \ 2170 product(uintx, TenuredGenerationSizeSupplementDecay, 2, \ 2171 "Decay factor to TenuredGenerationSizeIncrement") \ 2172 \ 2173 product(uintx, MaxGCPauseMillis, max_uintx, \ 2174 "Adaptive size policy maximum GC pause time goal in millisecond, "\ 2175 "or (G1 Only) the maximum GC time per MMU time slice") \ 2176 \ 2177 product(uintx, GCPauseIntervalMillis, 0, \ 2178 "Time slice for MMU specification") \ 2179 \ 2180 product(uintx, MaxGCMinorPauseMillis, max_uintx, \ 2181 "Adaptive size policy maximum GC minor pause time goal " \ 2182 "in millisecond") \ 2183 \ 2184 product(uintx, GCTimeRatio, 99, \ 2185 "Adaptive size policy application time to GC time ratio") \ 2186 \ 2187 product(uintx, AdaptiveSizeDecrementScaleFactor, 4, \ 2188 "Adaptive size scale down factor for shrinking") \ 2189 \ 2190 product(bool, UseAdaptiveSizeDecayMajorGCCost, true, \ 2191 "Adaptive size decays the major cost for long major intervals") \ 2192 \ 2193 product(uintx, AdaptiveSizeMajorGCDecayTimeScale, 10, \ 2194 "Time scale over which major costs decay") \ 2195 \ 2196 product(uintx, MinSurvivorRatio, 3, \ 2197 "Minimum ratio of young generation/survivor space size") \ 2198 \ 2199 product(uintx, InitialSurvivorRatio, 8, \ 2200 "Initial ratio of young generation/survivor space size") \ 2201 \ 2202 product(uintx, BaseFootPrintEstimate, 256*M, \ 2203 "Estimate of footprint other than Java Heap") \ 2204 \ 2205 product(bool, UseGCOverheadLimit, true, \ 2206 "Use policy to limit of proportion of time spent in GC " \ 2207 "before an OutOfMemory error is thrown") \ 2208 \ 2209 product(uintx, GCTimeLimit, 98, \ 2210 "Limit of the proportion of time spent in GC before " \ 2211 "an OutOfMemoryError is thrown (used with GCHeapFreeLimit)") \ 2212 \ 2213 product(uintx, GCHeapFreeLimit, 2, \ 2214 "Minimum percentage of free space after a full GC before an " \ 2215 "OutOfMemoryError is thrown (used with GCTimeLimit)") \ 2216 \ 2217 develop(uintx, AdaptiveSizePolicyGCTimeLimitThreshold, 5, \ 2218 "Number of consecutive collections before gc time limit fires") \ 2219 \ 2220 product(bool, PrintAdaptiveSizePolicy, false, \ 2221 "Print information about AdaptiveSizePolicy") \ 2222 \ 2223 product(intx, PrefetchCopyIntervalInBytes, -1, \ 2224 "How far ahead to prefetch destination area (<= 0 means off)") \ 2225 \ 2226 product(intx, PrefetchScanIntervalInBytes, -1, \ 2227 "How far ahead to prefetch scan area (<= 0 means off)") \ 2228 \ 2229 product(intx, PrefetchFieldsAhead, -1, \ 2230 "How many fields ahead to prefetch in oop scan (<= 0 means off)") \ 2231 \ 2232 diagnostic(bool, VerifySilently, false, \ 2233 "Do not print the verification progress") \ 2234 \ 2235 diagnostic(bool, VerifyDuringStartup, false, \ 2236 "Verify memory system before executing any Java code " \ 2237 "during VM initialization") \ 2238 \ 2239 diagnostic(bool, VerifyBeforeExit, trueInDebug, \ 2240 "Verify system before exiting") \ 2241 \ 2242 diagnostic(bool, VerifyBeforeGC, false, \ 2243 "Verify memory system before GC") \ 2244 \ 2245 diagnostic(bool, VerifyAfterGC, false, \ 2246 "Verify memory system after GC") \ 2247 \ 2248 diagnostic(bool, VerifyDuringGC, false, \ 2249 "Verify memory system during GC (between phases)") \ 2250 \ 2251 diagnostic(bool, GCParallelVerificationEnabled, true, \ 2252 "Enable parallel memory system verification") \ 2253 \ 2254 diagnostic(bool, DeferInitialCardMark, false, \ 2255 "When +ReduceInitialCardMarks, explicitly defer any that " \ 2256 "may arise from new_pre_store_barrier") \ 2257 \ 2258 diagnostic(bool, VerifyRememberedSets, false, \ 2259 "Verify GC remembered sets") \ 2260 \ 2261 diagnostic(bool, VerifyObjectStartArray, true, \ 2262 "Verify GC object start array if verify before/after") \ 2263 \ 2264 product(bool, DisableExplicitGC, false, \ 2265 "Ignore calls to System.gc()") \ 2266 \ 2267 notproduct(bool, CheckMemoryInitialization, false, \ 2268 "Check memory initialization") \ 2269 \ 2270 diagnostic(bool, BindCMSThreadToCPU, false, \ 2271 "Bind CMS Thread to CPU if possible") \ 2272 \ 2273 diagnostic(uintx, CPUForCMSThread, 0, \ 2274 "When BindCMSThreadToCPU is true, the CPU to bind CMS thread to") \ 2275 \ 2276 product(bool, BindGCTaskThreadsToCPUs, false, \ 2277 "Bind GCTaskThreads to CPUs if possible") \ 2278 \ 2279 product(bool, UseGCTaskAffinity, false, \ 2280 "Use worker affinity when asking for GCTasks") \ 2281 \ 2282 product(uintx, ProcessDistributionStride, 4, \ 2283 "Stride through processors when distributing processes") \ 2284 \ 2285 product(uintx, CMSCoordinatorYieldSleepCount, 10, \ 2286 "Number of times the coordinator GC thread will sleep while " \ 2287 "yielding before giving up and resuming GC") \ 2288 \ 2289 product(uintx, CMSYieldSleepCount, 0, \ 2290 "Number of times a GC thread (minus the coordinator) " \ 2291 "will sleep while yielding before giving up and resuming GC") \ 2292 \ 2293 /* gc tracing */ \ 2294 manageable(bool, PrintGC, false, \ 2295 "Print message at garbage collection") \ 2296 \ 2297 manageable(bool, PrintGCDetails, false, \ 2298 "Print more details at garbage collection") \ 2299 \ 2300 manageable(bool, PrintGCDateStamps, false, \ 2301 "Print date stamps at garbage collection") \ 2302 \ 2303 manageable(bool, PrintGCTimeStamps, false, \ 2304 "Print timestamps at garbage collection") \ 2305 \ 2306 manageable(bool, PrintGCID, true, \ 2307 "Print an identifier for each garbage collection") \ 2308 \ 2309 product(bool, PrintGCTaskTimeStamps, false, \ 2310 "Print timestamps for individual gc worker thread tasks") \ 2311 \ 2312 develop(intx, ConcGCYieldTimeout, 0, \ 2313 "If non-zero, assert that GC threads yield within this " \ 2314 "number of milliseconds") \ 2315 \ 2316 notproduct(bool, TraceMarkSweep, false, \ 2317 "Trace mark sweep") \ 2318 \ 2319 product(bool, PrintReferenceGC, false, \ 2320 "Print times spent handling reference objects during GC " \ 2321 "(enabled only when PrintGCDetails)") \ 2322 \ 2323 develop(bool, TraceReferenceGC, false, \ 2324 "Trace handling of soft/weak/final/phantom references") \ 2325 \ 2326 develop(bool, TraceFinalizerRegistration, false, \ 2327 "Trace registration of final references") \ 2328 \ 2329 notproduct(bool, TraceScavenge, false, \ 2330 "Trace scavenge") \ 2331 \ 2332 product_rw(bool, TraceClassLoading, false, \ 2333 "Trace all classes loaded") \ 2334 \ 2335 product(bool, TraceClassLoadingPreorder, false, \ 2336 "Trace all classes loaded in order referenced (not loaded)") \ 2337 \ 2338 product_rw(bool, TraceClassUnloading, false, \ 2339 "Trace unloading of classes") \ 2340 \ 2341 product_rw(bool, TraceLoaderConstraints, false, \ 2342 "Trace loader constraints") \ 2343 \ 2344 develop(bool, TraceClassLoaderData, false, \ 2345 "Trace class loader loader_data lifetime") \ 2346 \ 2347 product(uintx, InitialBootClassLoaderMetaspaceSize, \ 2348 NOT_LP64(2200*K) LP64_ONLY(4*M), \ 2349 "Initial size of the boot class loader data metaspace") \ 2350 \ 2351 product(bool, TraceYoungGenTime, false, \ 2352 "Trace accumulated time for young collection") \ 2353 \ 2354 product(bool, TraceOldGenTime, false, \ 2355 "Trace accumulated time for old collection") \ 2356 \ 2357 product(bool, PrintTenuringDistribution, false, \ 2358 "Print tenuring age information") \ 2359 \ 2360 product_rw(bool, PrintHeapAtGC, false, \ 2361 "Print heap layout before and after each GC") \ 2362 \ 2363 product_rw(bool, PrintHeapAtGCExtended, false, \ 2364 "Print extended information about the layout of the heap " \ 2365 "when -XX:+PrintHeapAtGC is set") \ 2366 \ 2367 product(bool, PrintHeapAtSIGBREAK, true, \ 2368 "Print heap layout in response to SIGBREAK") \ 2369 \ 2370 manageable(bool, PrintClassHistogramBeforeFullGC, false, \ 2371 "Print a class histogram before any major stop-world GC") \ 2372 \ 2373 manageable(bool, PrintClassHistogramAfterFullGC, false, \ 2374 "Print a class histogram after any major stop-world GC") \ 2375 \ 2376 manageable(bool, PrintClassHistogram, false, \ 2377 "Print a histogram of class instances") \ 2378 \ 2379 develop(bool, TraceWorkGang, false, \ 2380 "Trace activities of work gangs") \ 2381 \ 2382 product(bool, TraceParallelOldGCTasks, false, \ 2383 "Trace multithreaded GC activity") \ 2384 \ 2385 develop(bool, TraceBlockOffsetTable, false, \ 2386 "Print BlockOffsetTable maps") \ 2387 \ 2388 develop(bool, TraceCardTableModRefBS, false, \ 2389 "Print CardTableModRefBS maps") \ 2390 \ 2391 develop(bool, TraceGCTaskManager, false, \ 2392 "Trace actions of the GC task manager") \ 2393 \ 2394 develop(bool, TraceGCTaskQueue, false, \ 2395 "Trace actions of the GC task queues") \ 2396 \ 2397 diagnostic(bool, TraceGCTaskThread, false, \ 2398 "Trace actions of the GC task threads") \ 2399 \ 2400 product(bool, PrintParallelOldGCPhaseTimes, false, \ 2401 "Print the time taken by each phase in ParallelOldGC " \ 2402 "(PrintGCDetails must also be enabled)") \ 2403 \ 2404 develop(bool, TraceParallelOldGCMarkingPhase, false, \ 2405 "Trace marking phase in ParallelOldGC") \ 2406 \ 2407 develop(bool, TraceParallelOldGCSummaryPhase, false, \ 2408 "Trace summary phase in ParallelOldGC") \ 2409 \ 2410 develop(bool, TraceParallelOldGCCompactionPhase, false, \ 2411 "Trace compaction phase in ParallelOldGC") \ 2412 \ 2413 develop(bool, TraceParallelOldGCDensePrefix, false, \ 2414 "Trace dense prefix computation for ParallelOldGC") \ 2415 \ 2416 develop(bool, IgnoreLibthreadGPFault, false, \ 2417 "Suppress workaround for libthread GP fault") \ 2418 \ 2419 product(bool, PrintJNIGCStalls, false, \ 2420 "Print diagnostic message when GC is stalled " \ 2421 "by JNI critical section") \ 2422 \ 2423 experimental(double, ObjectCountCutOffPercent, 0.5, \ 2424 "The percentage of the used heap that the instances of a class " \ 2425 "must occupy for the class to generate a trace event") \ 2426 \ 2427 /* GC log rotation setting */ \ 2428 \ 2429 product(bool, UseGCLogFileRotation, false, \ 2430 "Rotate gclog files (for long running applications). It requires "\ 2431 "-Xloggc:<filename>") \ 2432 \ 2433 product(uintx, NumberOfGCLogFiles, 0, \ 2434 "Number of gclog files in rotation " \ 2435 "(default: 0, no rotation)") \ 2436 \ 2437 product(uintx, GCLogFileSize, 8*K, \ 2438 "GC log file size, requires UseGCLogFileRotation. " \ 2439 "Set to 0 to only trigger rotation via jcmd") \ 2440 \ 2441 /* JVMTI heap profiling */ \ 2442 \ 2443 diagnostic(bool, TraceJVMTIObjectTagging, false, \ 2444 "Trace JVMTI object tagging calls") \ 2445 \ 2446 diagnostic(bool, VerifyBeforeIteration, false, \ 2447 "Verify memory system before JVMTI iteration") \ 2448 \ 2449 /* compiler interface */ \ 2450 \ 2451 develop(bool, CIPrintCompilerName, false, \ 2452 "when CIPrint is active, print the name of the active compiler") \ 2453 \ 2454 develop(bool, CIPrintCompileQueue, false, \ 2455 "display the contents of the compile queue whenever a " \ 2456 "compilation is enqueued") \ 2457 \ 2458 develop(bool, CIPrintRequests, false, \ 2459 "display every request for compilation") \ 2460 \ 2461 product(bool, CITime, false, \ 2462 "collect timing information for compilation") \ 2463 \ 2464 develop(bool, CITimeEach, false, \ 2465 "display timing information after each successful compilation") \ 2466 \ 2467 develop(bool, CICountOSR, false, \ 2468 "use a separate counter when assigning ids to osr compilations") \ 2469 \ 2470 develop(bool, CICompileNatives, true, \ 2471 "compile native methods if supported by the compiler") \ 2472 \ 2473 develop_pd(bool, CICompileOSR, \ 2474 "compile on stack replacement methods if supported by the " \ 2475 "compiler") \ 2476 \ 2477 develop(bool, CIPrintMethodCodes, false, \ 2478 "print method bytecodes of the compiled code") \ 2479 \ 2480 develop(bool, CIPrintTypeFlow, false, \ 2481 "print the results of ciTypeFlow analysis") \ 2482 \ 2483 develop(bool, CITraceTypeFlow, false, \ 2484 "detailed per-bytecode tracing of ciTypeFlow analysis") \ 2485 \ 2486 develop(intx, OSROnlyBCI, -1, \ 2487 "OSR only at this bci. Negative values mean exclude that bci") \ 2488 \ 2489 /* compiler */ \ 2490 \ 2491 product(intx, CICompilerCount, CI_COMPILER_COUNT, \ 2492 "Number of compiler threads to run") \ 2493 \ 2494 product(intx, CompilationPolicyChoice, 0, \ 2495 "which compilation policy (0/1)") \ 2496 \ 2497 develop(bool, UseStackBanging, true, \ 2498 "use stack banging for stack overflow checks (required for " \ 2499 "proper StackOverflow handling; disable only to measure cost " \ 2500 "of stackbanging)") \ 2501 \ 2502 develop(bool, UseStrictFP, true, \ 2503 "use strict fp if modifier strictfp is set") \ 2504 \ 2505 develop(bool, GenerateSynchronizationCode, true, \ 2506 "generate locking/unlocking code for synchronized methods and " \ 2507 "monitors") \ 2508 \ 2509 develop(bool, GenerateCompilerNullChecks, true, \ 2510 "Generate explicit null checks for loads/stores/calls") \ 2511 \ 2512 develop(bool, GenerateRangeChecks, true, \ 2513 "Generate range checks for array accesses") \ 2514 \ 2515 develop_pd(bool, ImplicitNullChecks, \ 2516 "Generate code for implicit null checks") \ 2517 \ 2518 product_pd(bool, TrapBasedNullChecks, \ 2519 "Generate code for null checks that uses a cmp and trap " \ 2520 "instruction raising SIGTRAP. This is only used if an access to" \ 2521 "null (+offset) will not raise a SIGSEGV, i.e.," \ 2522 "ImplicitNullChecks don't work (PPC64).") \ 2523 \ 2524 product(bool, PrintSafepointStatistics, false, \ 2525 "Print statistics about safepoint synchronization") \ 2526 \ 2527 product(intx, PrintSafepointStatisticsCount, 300, \ 2528 "Total number of safepoint statistics collected " \ 2529 "before printing them out") \ 2530 \ 2531 product(intx, PrintSafepointStatisticsTimeout, -1, \ 2532 "Print safepoint statistics only when safepoint takes " \ 2533 "more than PrintSafepointSatisticsTimeout in millis") \ 2534 \ 2535 product(bool, TraceSafepointCleanupTime, false, \ 2536 "Print the break down of clean up tasks performed during " \ 2537 "safepoint") \ 2538 \ 2539 product(bool, Inline, true, \ 2540 "Enable inlining") \ 2541 \ 2542 product(bool, ClipInlining, true, \ 2543 "Clip inlining if aggregate method exceeds DesiredMethodLimit") \ 2544 \ 2545 develop(bool, UseCHA, true, \ 2546 "Enable CHA") \ 2547 \ 2548 product(bool, UseTypeProfile, true, \ 2549 "Check interpreter profile for historically monomorphic calls") \ 2550 \ 2551 notproduct(bool, TimeCompiler, false, \ 2552 "Time the compiler") \ 2553 \ 2554 diagnostic(bool, PrintInlining, false, \ 2555 "Print inlining optimizations") \ 2556 \ 2557 product(bool, UsePopCountInstruction, false, \ 2558 "Use population count instruction") \ 2559 \ 2560 develop(bool, EagerInitialization, false, \ 2561 "Eagerly initialize classes if possible") \ 2562 \ 2563 develop(bool, TraceMethodReplacement, false, \ 2564 "Print when methods are replaced do to recompilation") \ 2565 \ 2566 develop(bool, PrintMethodFlushing, false, \ 2567 "Print the nmethods being flushed") \ 2568 \ 2569 diagnostic(bool, PrintMethodFlushingStatistics, false, \ 2570 "print statistics about method flushing") \ 2571 \ 2572 diagnostic(intx, HotMethodDetectionLimit, 100000, \ 2573 "Number of compiled code invocations after which " \ 2574 "the method is considered as hot by the flusher") \ 2575 \ 2576 diagnostic(intx, MinPassesBeforeFlush, 10, \ 2577 "Minimum number of sweeper passes before an nmethod " \ 2578 "can be flushed") \ 2579 \ 2580 product(bool, UseCodeAging, true, \ 2581 "Insert counter to detect warm methods") \ 2582 \ 2583 diagnostic(bool, StressCodeAging, false, \ 2584 "Start with counters compiled in") \ 2585 \ 2586 develop(bool, UseRelocIndex, false, \ 2587 "Use an index to speed random access to relocations") \ 2588 \ 2589 develop(bool, StressCodeBuffers, false, \ 2590 "Exercise code buffer expansion and other rare state changes") \ 2591 \ 2592 diagnostic(bool, DebugNonSafepoints, trueInDebug, \ 2593 "Generate extra debugging information for non-safepoints in " \ 2594 "nmethods") \ 2595 \ 2596 product(bool, PrintVMOptions, false, \ 2597 "Print flags that appeared on the command line") \ 2598 \ 2599 product(bool, IgnoreUnrecognizedVMOptions, false, \ 2600 "Ignore unrecognized VM options") \ 2601 \ 2602 product(bool, PrintCommandLineFlags, false, \ 2603 "Print flags specified on command line or set by ergonomics") \ 2604 \ 2605 product(bool, PrintFlagsInitial, false, \ 2606 "Print all VM flags before argument processing and exit VM") \ 2607 \ 2608 product(bool, PrintFlagsFinal, false, \ 2609 "Print all VM flags after argument and ergonomic processing") \ 2610 \ 2611 notproduct(bool, PrintFlagsWithComments, false, \ 2612 "Print all VM flags with default values and descriptions and " \ 2613 "exit") \ 2614 \ 2615 diagnostic(bool, SerializeVMOutput, true, \ 2616 "Use a mutex to serialize output to tty and LogFile") \ 2617 \ 2618 diagnostic(bool, DisplayVMOutput, true, \ 2619 "Display all VM output on the tty, independently of LogVMOutput") \ 2620 \ 2621 diagnostic(bool, LogVMOutput, false, \ 2622 "Save VM output to LogFile") \ 2623 \ 2624 diagnostic(ccstr, LogFile, NULL, \ 2625 "If LogVMOutput or LogCompilation is on, save VM output to " \ 2626 "this file [default: ./hotspot_pid%p.log] (%p replaced with pid)")\ 2627 \ 2628 product(ccstr, ErrorFile, NULL, \ 2629 "If an error occurs, save the error data to this file " \ 2630 "[default: ./hs_err_pid%p.log] (%p replaced with pid)") \ 2631 \ 2632 product(bool, DisplayVMOutputToStderr, false, \ 2633 "If DisplayVMOutput is true, display all VM output to stderr") \ 2634 \ 2635 product(bool, DisplayVMOutputToStdout, false, \ 2636 "If DisplayVMOutput is true, display all VM output to stdout") \ 2637 \ 2638 product(bool, UseHeavyMonitors, false, \ 2639 "use heavyweight instead of lightweight Java monitors") \ 2640 \ 2641 product(bool, PrintStringTableStatistics, false, \ 2642 "print statistics about the StringTable and SymbolTable") \ 2643 \ 2644 diagnostic(bool, VerifyStringTableAtExit, false, \ 2645 "verify StringTable contents at exit") \ 2646 \ 2647 notproduct(bool, PrintSymbolTableSizeHistogram, false, \ 2648 "print histogram of the symbol table") \ 2649 \ 2650 notproduct(bool, ExitVMOnVerifyError, false, \ 2651 "standard exit from VM if bytecode verify error " \ 2652 "(only in debug mode)") \ 2653 \ 2654 notproduct(ccstr, AbortVMOnException, NULL, \ 2655 "Call fatal if this exception is thrown. Example: " \ 2656 "java -XX:AbortVMOnException=java.lang.NullPointerException Foo") \ 2657 \ 2658 notproduct(ccstr, AbortVMOnExceptionMessage, NULL, \ 2659 "Call fatal if the exception pointed by AbortVMOnException " \ 2660 "has this message") \ 2661 \ 2662 develop(bool, DebugVtables, false, \ 2663 "add debugging code to vtable dispatch") \ 2664 \ 2665 develop(bool, PrintVtables, false, \ 2666 "print vtables when printing klass") \ 2667 \ 2668 notproduct(bool, PrintVtableStats, false, \ 2669 "print vtables stats at end of run") \ 2670 \ 2671 develop(bool, TraceCreateZombies, false, \ 2672 "trace creation of zombie nmethods") \ 2673 \ 2674 notproduct(bool, IgnoreLockingAssertions, false, \ 2675 "disable locking assertions (for speed)") \ 2676 \ 2677 product(bool, RangeCheckElimination, true, \ 2678 "Eliminate range checks") \ 2679 \ 2680 develop_pd(bool, UncommonNullCast, \ 2681 "track occurrences of null in casts; adjust compiler tactics") \ 2682 \ 2683 develop(bool, TypeProfileCasts, true, \ 2684 "treat casts like calls for purposes of type profiling") \ 2685 \ 2686 develop(bool, DelayCompilationDuringStartup, true, \ 2687 "Delay invoking the compiler until main application class is " \ 2688 "loaded") \ 2689 \ 2690 develop(bool, CompileTheWorld, false, \ 2691 "Compile all methods in all classes in bootstrap class path " \ 2692 "(stress test)") \ 2693 \ 2694 develop(bool, CompileTheWorldPreloadClasses, true, \ 2695 "Preload all classes used by a class before start loading") \ 2696 \ 2697 notproduct(intx, CompileTheWorldSafepointInterval, 100, \ 2698 "Force a safepoint every n compiles so sweeper can keep up") \ 2699 \ 2700 develop(bool, FillDelaySlots, true, \ 2701 "Fill delay slots (on SPARC only)") \ 2702 \ 2703 develop(bool, TimeLivenessAnalysis, false, \ 2704 "Time computation of bytecode liveness analysis") \ 2705 \ 2706 develop(bool, TraceLivenessGen, false, \ 2707 "Trace the generation of liveness analysis information") \ 2708 \ 2709 notproduct(bool, TraceLivenessQuery, false, \ 2710 "Trace queries of liveness analysis information") \ 2711 \ 2712 notproduct(bool, CollectIndexSetStatistics, false, \ 2713 "Collect information about IndexSets") \ 2714 \ 2715 develop(bool, UseLoopSafepoints, true, \ 2716 "Generate Safepoint nodes in every loop") \ 2717 \ 2718 develop(intx, FastAllocateSizeLimit, 128*K, \ 2719 /* Note: This value is zero mod 1<<13 for a cheap sparc set. */ \ 2720 "Inline allocations larger than this in doublewords must go slow")\ 2721 \ 2722 product(bool, AggressiveOpts, false, \ 2723 "Enable aggressive optimizations - see arguments.cpp") \ 2724 \ 2725 product_pd(uintx, TypeProfileLevel, \ 2726 "=XYZ, with Z: Type profiling of arguments at call; " \ 2727 "Y: Type profiling of return value at call; " \ 2728 "X: Type profiling of parameters to methods; " \ 2729 "X, Y and Z in 0=off ; 1=jsr292 only; 2=all methods") \ 2730 \ 2731 product(intx, TypeProfileArgsLimit, 2, \ 2732 "max number of call arguments to consider for type profiling") \ 2733 \ 2734 product(intx, TypeProfileParmsLimit, 2, \ 2735 "max number of incoming parameters to consider for type profiling"\ 2736 ", -1 for all") \ 2737 \ 2738 /* statistics */ \ 2739 develop(bool, CountCompiledCalls, false, \ 2740 "Count method invocations") \ 2741 \ 2742 notproduct(bool, CountRuntimeCalls, false, \ 2743 "Count VM runtime calls") \ 2744 \ 2745 develop(bool, CountJNICalls, false, \ 2746 "Count jni method invocations") \ 2747 \ 2748 notproduct(bool, CountJVMCalls, false, \ 2749 "Count jvm method invocations") \ 2750 \ 2751 notproduct(bool, CountRemovableExceptions, false, \ 2752 "Count exceptions that could be replaced by branches due to " \ 2753 "inlining") \ 2754 \ 2755 notproduct(bool, ICMissHistogram, false, \ 2756 "Produce histogram of IC misses") \ 2757 \ 2758 notproduct(bool, PrintClassStatistics, false, \ 2759 "Print class statistics at end of run") \ 2760 \ 2761 notproduct(bool, PrintMethodStatistics, false, \ 2762 "Print method statistics at end of run") \ 2763 \ 2764 /* interpreter */ \ 2765 develop(bool, ClearInterpreterLocals, false, \ 2766 "Always clear local variables of interpreter activations upon " \ 2767 "entry") \ 2768 \ 2769 product_pd(bool, RewriteBytecodes, \ 2770 "Allow rewriting of bytecodes (bytecodes are not immutable)") \ 2771 \ 2772 product_pd(bool, RewriteFrequentPairs, \ 2773 "Rewrite frequently used bytecode pairs into a single bytecode") \ 2774 \ 2775 diagnostic(bool, PrintInterpreter, false, \ 2776 "Print the generated interpreter code") \ 2777 \ 2778 product(bool, UseInterpreter, true, \ 2779 "Use interpreter for non-compiled methods") \ 2780 \ 2781 develop(bool, UseFastSignatureHandlers, true, \ 2782 "Use fast signature handlers for native calls") \ 2783 \ 2784 product(bool, UseLoopCounter, true, \ 2785 "Increment invocation counter on backward branch") \ 2786 \ 2787 product_pd(bool, UseOnStackReplacement, \ 2788 "Use on stack replacement, calls runtime if invoc. counter " \ 2789 "overflows in loop") \ 2790 \ 2791 notproduct(bool, TraceOnStackReplacement, false, \ 2792 "Trace on stack replacement") \ 2793 \ 2794 product_pd(bool, PreferInterpreterNativeStubs, \ 2795 "Use always interpreter stubs for native methods invoked via " \ 2796 "interpreter") \ 2797 \ 2798 develop(bool, CountBytecodes, false, \ 2799 "Count number of bytecodes executed") \ 2800 \ 2801 develop(bool, PrintBytecodeHistogram, false, \ 2802 "Print histogram of the executed bytecodes") \ 2803 \ 2804 develop(bool, PrintBytecodePairHistogram, false, \ 2805 "Print histogram of the executed bytecode pairs") \ 2806 \ 2807 diagnostic(bool, PrintSignatureHandlers, false, \ 2808 "Print code generated for native method signature handlers") \ 2809 \ 2810 develop(bool, VerifyOops, false, \ 2811 "Do plausibility checks for oops") \ 2812 \ 2813 develop(bool, CheckUnhandledOops, false, \ 2814 "Check for unhandled oops in VM code") \ 2815 \ 2816 develop(bool, VerifyJNIFields, trueInDebug, \ 2817 "Verify jfieldIDs for instance fields") \ 2818 \ 2819 notproduct(bool, VerifyJNIEnvThread, false, \ 2820 "Verify JNIEnv.thread == Thread::current() when entering VM " \ 2821 "from JNI") \ 2822 \ 2823 develop(bool, VerifyFPU, false, \ 2824 "Verify FPU state (check for NaN's, etc.)") \ 2825 \ 2826 develop(bool, VerifyThread, false, \ 2827 "Watch the thread register for corruption (SPARC only)") \ 2828 \ 2829 develop(bool, VerifyActivationFrameSize, false, \ 2830 "Verify that activation frame didn't become smaller than its " \ 2831 "minimal size") \ 2832 \ 2833 develop(bool, TraceFrequencyInlining, false, \ 2834 "Trace frequency based inlining") \ 2835 \ 2836 develop_pd(bool, InlineIntrinsics, \ 2837 "Inline intrinsics that can be statically resolved") \ 2838 \ 2839 product_pd(bool, ProfileInterpreter, \ 2840 "Profile at the bytecode level during interpretation") \ 2841 \ 2842 develop(bool, TraceProfileInterpreter, false, \ 2843 "Trace profiling at the bytecode level during interpretation. " \ 2844 "This outputs the profiling information collected to improve " \ 2845 "jit compilation.") \ 2846 \ 2847 develop_pd(bool, ProfileTraps, \ 2848 "Profile deoptimization traps at the bytecode level") \ 2849 \ 2850 product(intx, ProfileMaturityPercentage, 20, \ 2851 "number of method invocations/branches (expressed as % of " \ 2852 "CompileThreshold) before using the method's profile") \ 2853 \ 2854 diagnostic(bool, PrintMethodData, false, \ 2855 "Print the results of +ProfileInterpreter at end of run") \ 2856 \ 2857 develop(bool, VerifyDataPointer, trueInDebug, \ 2858 "Verify the method data pointer during interpreter profiling") \ 2859 \ 2860 develop(bool, VerifyCompiledCode, false, \ 2861 "Include miscellaneous runtime verifications in nmethod code; " \ 2862 "default off because it disturbs nmethod size heuristics") \ 2863 \ 2864 notproduct(bool, CrashGCForDumpingJavaThread, false, \ 2865 "Manually make GC thread crash then dump java stack trace; " \ 2866 "Test only") \ 2867 \ 2868 /* compilation */ \ 2869 product(bool, UseCompiler, true, \ 2870 "Use Just-In-Time compilation") \ 2871 \ 2872 develop(bool, TraceCompilationPolicy, false, \ 2873 "Trace compilation policy") \ 2874 \ 2875 develop(bool, TimeCompilationPolicy, false, \ 2876 "Time the compilation policy") \ 2877 \ 2878 product(bool, UseCounterDecay, true, \ 2879 "Adjust recompilation counters") \ 2880 \ 2881 develop(intx, CounterHalfLifeTime, 30, \ 2882 "Half-life time of invocation counters (in seconds)") \ 2883 \ 2884 develop(intx, CounterDecayMinIntervalLength, 500, \ 2885 "The minimum interval (in milliseconds) between invocation of " \ 2886 "CounterDecay") \ 2887 \ 2888 product(bool, AlwaysCompileLoopMethods, false, \ 2889 "When using recompilation, never interpret methods " \ 2890 "containing loops") \ 2891 \ 2892 product(bool, DontCompileHugeMethods, true, \ 2893 "Do not compile methods > HugeMethodLimit") \ 2894 \ 2895 /* Bytecode escape analysis estimation. */ \ 2896 product(bool, EstimateArgEscape, true, \ 2897 "Analyze bytecodes to estimate escape state of arguments") \ 2898 \ 2899 product(intx, BCEATraceLevel, 0, \ 2900 "How much tracing to do of bytecode escape analysis estimates") \ 2901 \ 2902 product(intx, MaxBCEAEstimateLevel, 5, \ 2903 "Maximum number of nested calls that are analyzed by BC EA") \ 2904 \ 2905 product(intx, MaxBCEAEstimateSize, 150, \ 2906 "Maximum bytecode size of a method to be analyzed by BC EA") \ 2907 \ 2908 product(intx, AllocatePrefetchStyle, 1, \ 2909 "0 = no prefetch, " \ 2910 "1 = prefetch instructions for each allocation, " \ 2911 "2 = use TLAB watermark to gate allocation prefetch, " \ 2912 "3 = use BIS instruction on Sparc for allocation prefetch") \ 2913 \ 2914 product(intx, AllocatePrefetchDistance, -1, \ 2915 "Distance to prefetch ahead of allocation pointer") \ 2916 \ 2917 product(intx, AllocatePrefetchLines, 3, \ 2918 "Number of lines to prefetch ahead of array allocation pointer") \ 2919 \ 2920 product(intx, AllocateInstancePrefetchLines, 1, \ 2921 "Number of lines to prefetch ahead of instance allocation " \ 2922 "pointer") \ 2923 \ 2924 product(intx, AllocatePrefetchStepSize, 16, \ 2925 "Step size in bytes of sequential prefetch instructions") \ 2926 \ 2927 product(intx, AllocatePrefetchInstr, 0, \ 2928 "Prefetch instruction to prefetch ahead of allocation pointer") \ 2929 \ 2930 /* deoptimization */ \ 2931 develop(bool, TraceDeoptimization, false, \ 2932 "Trace deoptimization") \ 2933 \ 2934 develop(bool, DebugDeoptimization, false, \ 2935 "Tracing various information while debugging deoptimization") \ 2936 \ 2937 product(intx, SelfDestructTimer, 0, \ 2938 "Will cause VM to terminate after a given time (in minutes) " \ 2939 "(0 means off)") \ 2940 \ 2941 product(intx, MaxJavaStackTraceDepth, 1024, \ 2942 "The maximum number of lines in the stack trace for Java " \ 2943 "exceptions (0 means all)") \ 2944 \ 2945 NOT_EMBEDDED(diagnostic(intx, GuaranteedSafepointInterval, 1000, \ 2946 "Guarantee a safepoint (at least) every so many milliseconds " \ 2947 "(0 means none)")) \ 2948 \ 2949 EMBEDDED_ONLY(product(intx, GuaranteedSafepointInterval, 0, \ 2950 "Guarantee a safepoint (at least) every so many milliseconds " \ 2951 "(0 means none)")) \ 2952 \ 2953 product(intx, SafepointTimeoutDelay, 10000, \ 2954 "Delay in milliseconds for option SafepointTimeout") \ 2955 \ 2956 product(intx, NmethodSweepFraction, 16, \ 2957 "Number of invocations of sweeper to cover all nmethods") \ 2958 \ 2959 product(intx, NmethodSweepCheckInterval, 5, \ 2960 "Compilers wake up every n seconds to possibly sweep nmethods") \ 2961 \ 2962 product(intx, NmethodSweepActivity, 10, \ 2963 "Removes cold nmethods from code cache if > 0. Higher values " \ 2964 "result in more aggressive sweeping") \ 2965 \ 2966 notproduct(bool, LogSweeper, false, \ 2967 "Keep a ring buffer of sweeper activity") \ 2968 \ 2969 notproduct(intx, SweeperLogEntries, 1024, \ 2970 "Number of records in the ring buffer of sweeper activity") \ 2971 \ 2972 notproduct(intx, MemProfilingInterval, 500, \ 2973 "Time between each invocation of the MemProfiler") \ 2974 \ 2975 develop(intx, MallocCatchPtr, -1, \ 2976 "Hit breakpoint when mallocing/freeing this pointer") \ 2977 \ 2978 notproduct(intx, AssertRepeat, 1, \ 2979 "number of times to evaluate expression in assert " \ 2980 "(to estimate overhead); only works with -DUSE_REPEATED_ASSERTS") \ 2981 \ 2982 notproduct(ccstrlist, SuppressErrorAt, "", \ 2983 "List of assertions (file:line) to muzzle") \ 2984 \ 2985 notproduct(uintx, HandleAllocationLimit, 1024, \ 2986 "Threshold for HandleMark allocation when +TraceHandleAllocation "\ 2987 "is used") \ 2988 \ 2989 develop(uintx, TotalHandleAllocationLimit, 1024, \ 2990 "Threshold for total handle allocation when " \ 2991 "+TraceHandleAllocation is used") \ 2992 \ 2993 develop(intx, StackPrintLimit, 100, \ 2994 "number of stack frames to print in VM-level stack dump") \ 2995 \ 2996 notproduct(intx, MaxElementPrintSize, 256, \ 2997 "maximum number of elements to print") \ 2998 \ 2999 notproduct(intx, MaxSubklassPrintSize, 4, \ 3000 "maximum number of subklasses to print when printing klass") \ 3001 \ 3002 product(intx, MaxInlineLevel, 9, \ 3003 "maximum number of nested calls that are inlined") \ 3004 \ 3005 product(intx, MaxRecursiveInlineLevel, 1, \ 3006 "maximum number of nested recursive calls that are inlined") \ 3007 \ 3008 develop(intx, MaxForceInlineLevel, 100, \ 3009 "maximum number of nested calls that are forced for inlining " \ 3010 "(using CompilerOracle or marked w/ @ForceInline)") \ 3011 \ 3012 product_pd(intx, InlineSmallCode, \ 3013 "Only inline already compiled methods if their code size is " \ 3014 "less than this") \ 3015 \ 3016 product(intx, MaxInlineSize, 35, \ 3017 "The maximum bytecode size of a method to be inlined") \ 3018 \ 3019 product_pd(intx, FreqInlineSize, \ 3020 "The maximum bytecode size of a frequent method to be inlined") \ 3021 \ 3022 product(intx, MaxTrivialSize, 6, \ 3023 "The maximum bytecode size of a trivial method to be inlined") \ 3024 \ 3025 product(intx, MinInliningThreshold, 250, \ 3026 "The minimum invocation count a method needs to have to be " \ 3027 "inlined") \ 3028 \ 3029 develop(intx, MethodHistogramCutoff, 100, \ 3030 "The cutoff value for method invocation histogram (+CountCalls)") \ 3031 \ 3032 develop(intx, ProfilerNumberOfInterpretedMethods, 25, \ 3033 "Number of interpreted methods to show in profile") \ 3034 \ 3035 develop(intx, ProfilerNumberOfCompiledMethods, 25, \ 3036 "Number of compiled methods to show in profile") \ 3037 \ 3038 develop(intx, ProfilerNumberOfStubMethods, 25, \ 3039 "Number of stub methods to show in profile") \ 3040 \ 3041 develop(intx, ProfilerNumberOfRuntimeStubNodes, 25, \ 3042 "Number of runtime stub nodes to show in profile") \ 3043 \ 3044 product(intx, ProfileIntervalsTicks, 100, \ 3045 "Number of ticks between printing of interval profile " \ 3046 "(+ProfileIntervals)") \ 3047 \ 3048 notproduct(intx, ScavengeALotInterval, 1, \ 3049 "Interval between which scavenge will occur with +ScavengeALot") \ 3050 \ 3051 notproduct(intx, FullGCALotInterval, 1, \ 3052 "Interval between which full gc will occur with +FullGCALot") \ 3053 \ 3054 notproduct(intx, FullGCALotStart, 0, \ 3055 "For which invocation to start FullGCAlot") \ 3056 \ 3057 notproduct(intx, FullGCALotDummies, 32*K, \ 3058 "Dummy object allocated with +FullGCALot, forcing all objects " \ 3059 "to move") \ 3060 \ 3061 develop(intx, DontYieldALotInterval, 10, \ 3062 "Interval between which yields will be dropped (milliseconds)") \ 3063 \ 3064 develop(intx, MinSleepInterval, 1, \ 3065 "Minimum sleep() interval (milliseconds) when " \ 3066 "ConvertSleepToYield is off (used for Solaris)") \ 3067 \ 3068 develop(intx, ProfilerPCTickThreshold, 15, \ 3069 "Number of ticks in a PC buckets to be a hotspot") \ 3070 \ 3071 notproduct(intx, DeoptimizeALotInterval, 5, \ 3072 "Number of exits until DeoptimizeALot kicks in") \ 3073 \ 3074 notproduct(intx, ZombieALotInterval, 5, \ 3075 "Number of exits until ZombieALot kicks in") \ 3076 \ 3077 diagnostic(intx, MallocVerifyInterval, 0, \ 3078 "If non-zero, verify C heap after every N calls to " \ 3079 "malloc/realloc/free") \ 3080 \ 3081 diagnostic(intx, MallocVerifyStart, 0, \ 3082 "If non-zero, start verifying C heap after Nth call to " \ 3083 "malloc/realloc/free") \ 3084 \ 3085 diagnostic(uintx, MallocMaxTestWords, 0, \ 3086 "If non-zero, maximum number of words that malloc/realloc can " \ 3087 "allocate (for testing only)") \ 3088 \ 3089 product(intx, TypeProfileWidth, 2, \ 3090 "Number of receiver types to record in call/cast profile") \ 3091 \ 3092 develop(intx, BciProfileWidth, 2, \ 3093 "Number of return bci's to record in ret profile") \ 3094 \ 3095 product(intx, PerMethodRecompilationCutoff, 400, \ 3096 "After recompiling N times, stay in the interpreter (-1=>'Inf')") \ 3097 \ 3098 product(intx, PerBytecodeRecompilationCutoff, 200, \ 3099 "Per-BCI limit on repeated recompilation (-1=>'Inf')") \ 3100 \ 3101 product(intx, PerMethodTrapLimit, 100, \ 3102 "Limit on traps (of one kind) in a method (includes inlines)") \ 3103 \ 3104 experimental(intx, PerMethodSpecTrapLimit, 5000, \ 3105 "Limit on speculative traps (of one kind) in a method (includes inlines)") \ 3106 \ 3107 product(intx, PerBytecodeTrapLimit, 4, \ 3108 "Limit on traps (of one kind) at a particular BCI") \ 3109 \ 3110 experimental(intx, SpecTrapLimitExtraEntries, 3, \ 3111 "Extra method data trap entries for speculation") \ 3112 \ 3113 develop(intx, InlineFrequencyRatio, 20, \ 3114 "Ratio of call site execution to caller method invocation") \ 3115 \ 3116 develop_pd(intx, InlineFrequencyCount, \ 3117 "Count of call site execution necessary to trigger frequent " \ 3118 "inlining") \ 3119 \ 3120 develop(intx, InlineThrowCount, 50, \ 3121 "Force inlining of interpreted methods that throw this often") \ 3122 \ 3123 develop(intx, InlineThrowMaxSize, 200, \ 3124 "Force inlining of throwing methods smaller than this") \ 3125 \ 3126 develop(intx, ProfilerNodeSize, 1024, \ 3127 "Size in K to allocate for the Profile Nodes of each thread") \ 3128 \ 3129 product_pd(intx, PreInflateSpin, \ 3130 "Number of times to spin wait before inflation") \ 3131 \ 3132 /* gc parameters */ \ 3133 product(uintx, InitialHeapSize, 0, \ 3134 "Initial heap size (in bytes); zero means use ergonomics") \ 3135 \ 3136 product(uintx, MaxHeapSize, ScaleForWordSize(96*M), \ 3137 "Maximum heap size (in bytes)") \ 3138 \ 3139 product(uintx, OldSize, ScaleForWordSize(4*M), \ 3140 "Initial tenured generation size (in bytes)") \ 3141 \ 3142 product(uintx, NewSize, ScaleForWordSize(1*M), \ 3143 "Initial new generation size (in bytes)") \ 3144 \ 3145 product(uintx, MaxNewSize, max_uintx, \ 3146 "Maximum new generation size (in bytes), max_uintx means set " \ 3147 "ergonomically") \ 3148 \ 3149 product(uintx, PretenureSizeThreshold, 0, \ 3150 "Maximum size in bytes of objects allocated in DefNew " \ 3151 "generation; zero means no maximum") \ 3152 \ 3153 product(uintx, TLABSize, 0, \ 3154 "Starting TLAB size (in bytes); zero means set ergonomically") \ 3155 \ 3156 product(uintx, MinTLABSize, 2*K, \ 3157 "Minimum allowed TLAB size (in bytes)") \ 3158 \ 3159 product(uintx, TLABAllocationWeight, 35, \ 3160 "Allocation averaging weight") \ 3161 \ 3162 product(uintx, TLABWasteTargetPercent, 1, \ 3163 "Percentage of Eden that can be wasted") \ 3164 \ 3165 product(uintx, TLABRefillWasteFraction, 64, \ 3166 "Maximum TLAB waste at a refill (internal fragmentation)") \ 3167 \ 3168 product(uintx, TLABWasteIncrement, 4, \ 3169 "Increment allowed waste at slow allocation") \ 3170 \ 3171 product(uintx, SurvivorRatio, 8, \ 3172 "Ratio of eden/survivor space size") \ 3173 \ 3174 product(uintx, NewRatio, 2, \ 3175 "Ratio of old/new generation sizes") \ 3176 \ 3177 product_pd(uintx, NewSizeThreadIncrease, \ 3178 "Additional size added to desired new generation size per " \ 3179 "non-daemon thread (in bytes)") \ 3180 \ 3181 product_pd(uintx, MetaspaceSize, \ 3182 "Initial size of Metaspaces (in bytes)") \ 3183 \ 3184 product(uintx, MaxMetaspaceSize, max_uintx, \ 3185 "Maximum size of Metaspaces (in bytes)") \ 3186 \ 3187 product(uintx, CompressedClassSpaceSize, 1*G, \ 3188 "Maximum size of class area in Metaspace when compressed " \ 3189 "class pointers are used") \ 3190 \ 3191 manageable(uintx, MinHeapFreeRatio, 40, \ 3192 "The minimum percentage of heap free after GC to avoid expansion."\ 3193 " For most GCs this applies to the old generation. In G1 and" \ 3194 " ParallelGC it applies to the whole heap.") \ 3195 \ 3196 manageable(uintx, MaxHeapFreeRatio, 70, \ 3197 "The maximum percentage of heap free after GC to avoid shrinking."\ 3198 " For most GCs this applies to the old generation. In G1 and" \ 3199 " ParallelGC it applies to the whole heap.") \ 3200 \ 3201 product(intx, SoftRefLRUPolicyMSPerMB, 1000, \ 3202 "Number of milliseconds per MB of free space in the heap") \ 3203 \ 3204 product(uintx, MinHeapDeltaBytes, ScaleForWordSize(128*K), \ 3205 "The minimum change in heap space due to GC (in bytes)") \ 3206 \ 3207 product(uintx, MinMetaspaceExpansion, ScaleForWordSize(256*K), \ 3208 "The minimum expansion of Metaspace (in bytes)") \ 3209 \ 3210 product(uintx, MinMetaspaceFreeRatio, 40, \ 3211 "The minimum percentage of Metaspace free after GC to avoid " \ 3212 "expansion") \ 3213 \ 3214 product(uintx, MaxMetaspaceFreeRatio, 70, \ 3215 "The maximum percentage of Metaspace free after GC to avoid " \ 3216 "shrinking") \ 3217 \ 3218 product(uintx, MaxMetaspaceExpansion, ScaleForWordSize(4*M), \ 3219 "The maximum expansion of Metaspace without full GC (in bytes)") \ 3220 \ 3221 product(uintx, QueuedAllocationWarningCount, 0, \ 3222 "Number of times an allocation that queues behind a GC " \ 3223 "will retry before printing a warning") \ 3224 \ 3225 diagnostic(uintx, VerifyGCStartAt, 0, \ 3226 "GC invoke count where +VerifyBefore/AfterGC kicks in") \ 3227 \ 3228 diagnostic(intx, VerifyGCLevel, 0, \ 3229 "Generation level at which to start +VerifyBefore/AfterGC") \ 3230 \ 3231 product(uintx, MaxTenuringThreshold, 15, \ 3232 "Maximum value for tenuring threshold") \ 3233 \ 3234 product(uintx, InitialTenuringThreshold, 7, \ 3235 "Initial value for tenuring threshold") \ 3236 \ 3237 product(uintx, TargetSurvivorRatio, 50, \ 3238 "Desired percentage of survivor space used after scavenge") \ 3239 \ 3240 product(uintx, MarkSweepDeadRatio, 5, \ 3241 "Percentage (0-100) of the old gen allowed as dead wood. " \ 3242 "Serial mark sweep treats this as both the minimum and maximum " \ 3243 "value. " \ 3244 "CMS uses this value only if it falls back to mark sweep. " \ 3245 "Par compact uses a variable scale based on the density of the " \ 3246 "generation and treats this as the maximum value when the heap " \ 3247 "is either completely full or completely empty. Par compact " \ 3248 "also has a smaller default value; see arguments.cpp.") \ 3249 \ 3250 product(uintx, MarkSweepAlwaysCompactCount, 4, \ 3251 "How often should we fully compact the heap (ignoring the dead " \ 3252 "space parameters)") \ 3253 \ 3254 product(intx, PrintCMSStatistics, 0, \ 3255 "Statistics for CMS") \ 3256 \ 3257 product(bool, PrintCMSInitiationStatistics, false, \ 3258 "Statistics for initiating a CMS collection") \ 3259 \ 3260 product(intx, PrintFLSStatistics, 0, \ 3261 "Statistics for CMS' FreeListSpace") \ 3262 \ 3263 product(intx, PrintFLSCensus, 0, \ 3264 "Census for CMS' FreeListSpace") \ 3265 \ 3266 develop(uintx, GCExpandToAllocateDelayMillis, 0, \ 3267 "Delay between expansion and allocation (in milliseconds)") \ 3268 \ 3269 develop(uintx, GCWorkerDelayMillis, 0, \ 3270 "Delay in scheduling GC workers (in milliseconds)") \ 3271 \ 3272 product(intx, DeferThrSuspendLoopCount, 4000, \ 3273 "(Unstable) Number of times to iterate in safepoint loop " \ 3274 "before blocking VM threads ") \ 3275 \ 3276 product(intx, DeferPollingPageLoopCount, -1, \ 3277 "(Unsafe,Unstable) Number of iterations in safepoint loop " \ 3278 "before changing safepoint polling page to RO ") \ 3279 \ 3280 product(intx, SafepointSpinBeforeYield, 2000, "(Unstable)") \ 3281 \ 3282 product(bool, PSChunkLargeArrays, true, \ 3283 "Process large arrays in chunks") \ 3284 \ 3285 product(uintx, GCDrainStackTargetSize, 64, \ 3286 "Number of entries we will try to leave on the stack " \ 3287 "during parallel gc") \ 3288 \ 3289 /* stack parameters */ \ 3290 product_pd(intx, StackYellowPages, \ 3291 "Number of yellow zone (recoverable overflows) pages") \ 3292 \ 3293 product_pd(intx, StackRedPages, \ 3294 "Number of red zone (unrecoverable overflows) pages") \ 3295 \ 3296 product_pd(intx, StackShadowPages, \ 3297 "Number of shadow zone (for overflow checking) pages " \ 3298 "this should exceed the depth of the VM and native call stack") \ 3299 \ 3300 product_pd(intx, ThreadStackSize, \ 3301 "Thread Stack Size (in Kbytes)") \ 3302 \ 3303 product_pd(intx, VMThreadStackSize, \ 3304 "Non-Java Thread Stack Size (in Kbytes)") \ 3305 \ 3306 product_pd(intx, CompilerThreadStackSize, \ 3307 "Compiler Thread Stack Size (in Kbytes)") \ 3308 \ 3309 develop_pd(uintx, JVMInvokeMethodSlack, \ 3310 "Stack space (bytes) required for JVM_InvokeMethod to complete") \ 3311 \ 3312 product(uintx, ThreadSafetyMargin, 50*M, \ 3313 "Thread safety margin is used on fixed-stack LinuxThreads (on " \ 3314 "Linux/x86 only) to prevent heap-stack collision. Set to 0 to " \ 3315 "disable this feature") \ 3316 \ 3317 /* code cache parameters */ \ 3318 /* ppc64/tiered compilation has large code-entry alignment. */ \ 3319 develop(uintx, CodeCacheSegmentSize, 64 PPC64_ONLY(+64) NOT_PPC64(TIERED_ONLY(+64)),\ 3320 "Code cache segment size (in bytes) - smallest unit of " \ 3321 "allocation") \ 3322 \ 3323 develop_pd(intx, CodeEntryAlignment, \ 3324 "Code entry alignment for generated code (in bytes)") \ 3325 \ 3326 product_pd(intx, OptoLoopAlignment, \ 3327 "Align inner loops to zero relative to this modulus") \ 3328 \ 3329 product_pd(uintx, InitialCodeCacheSize, \ 3330 "Initial code cache size (in bytes)") \ 3331 \ 3332 develop_pd(uintx, CodeCacheMinimumUseSpace, \ 3333 "Minimum code cache size (in bytes) required to start VM.") \ 3334 \ 3335 product_pd(uintx, ReservedCodeCacheSize, \ 3336 "Reserved code cache size (in bytes) - maximum code cache size") \ 3337 \ 3338 product(uintx, CodeCacheMinimumFreeSpace, 500*K, \ 3339 "When less than X space left, we stop compiling") \ 3340 \ 3341 product_pd(uintx, CodeCacheExpansionSize, \ 3342 "Code cache expansion size (in bytes)") \ 3343 \ 3344 develop_pd(uintx, CodeCacheMinBlockLength, \ 3345 "Minimum number of segments in a code cache block") \ 3346 \ 3347 notproduct(bool, ExitOnFullCodeCache, false, \ 3348 "Exit the VM if we fill the code cache") \ 3349 \ 3350 product(bool, UseCodeCacheFlushing, true, \ 3351 "Remove cold/old nmethods from the code cache") \ 3352 \ 3353 /* interpreter debugging */ \ 3354 develop(intx, BinarySwitchThreshold, 5, \ 3355 "Minimal number of lookupswitch entries for rewriting to binary " \ 3356 "switch") \ 3357 \ 3358 develop(intx, StopInterpreterAt, 0, \ 3359 "Stop interpreter execution at specified bytecode number") \ 3360 \ 3361 develop(intx, TraceBytecodesAt, 0, \ 3362 "Trace bytecodes starting with specified bytecode number") \ 3363 \ 3364 /* compiler interface */ \ 3365 develop(intx, CIStart, 0, \ 3366 "The id of the first compilation to permit") \ 3367 \ 3368 develop(intx, CIStop, max_jint, \ 3369 "The id of the last compilation to permit") \ 3370 \ 3371 develop(intx, CIStartOSR, 0, \ 3372 "The id of the first osr compilation to permit " \ 3373 "(CICountOSR must be on)") \ 3374 \ 3375 develop(intx, CIStopOSR, max_jint, \ 3376 "The id of the last osr compilation to permit " \ 3377 "(CICountOSR must be on)") \ 3378 \ 3379 develop(intx, CIBreakAtOSR, -1, \ 3380 "The id of osr compilation to break at") \ 3381 \ 3382 develop(intx, CIBreakAt, -1, \ 3383 "The id of compilation to break at") \ 3384 \ 3385 product(ccstrlist, CompileOnly, "", \ 3386 "List of methods (pkg/class.name) to restrict compilation to") \ 3387 \ 3388 product(ccstr, CompileCommandFile, NULL, \ 3389 "Read compiler commands from this file [.hotspot_compiler]") \ 3390 \ 3391 product(ccstrlist, CompileCommand, "", \ 3392 "Prepend to .hotspot_compiler; e.g. log,java/lang/String.<init>") \ 3393 \ 3394 develop(bool, ReplayCompiles, false, \ 3395 "Enable replay of compilations from ReplayDataFile") \ 3396 \ 3397 product(ccstr, ReplayDataFile, NULL, \ 3398 "File containing compilation replay information" \ 3399 "[default: ./replay_pid%p.log] (%p replaced with pid)") \ 3400 \ 3401 product(ccstr, InlineDataFile, NULL, \ 3402 "File containing inlining replay information" \ 3403 "[default: ./inline_pid%p.log] (%p replaced with pid)") \ 3404 \ 3405 develop(intx, ReplaySuppressInitializers, 2, \ 3406 "Control handling of class initialization during replay: " \ 3407 "0 - don't do anything special; " \ 3408 "1 - treat all class initializers as empty; " \ 3409 "2 - treat class initializers for application classes as empty; " \ 3410 "3 - allow all class initializers to run during bootstrap but " \ 3411 " pretend they are empty after starting replay") \ 3412 \ 3413 develop(bool, ReplayIgnoreInitErrors, false, \ 3414 "Ignore exceptions thrown during initialization for replay") \ 3415 \ 3416 product(bool, DumpReplayDataOnError, true, \ 3417 "Record replay data for crashing compiler threads") \ 3418 \ 3419 product(bool, CICompilerCountPerCPU, false, \ 3420 "1 compiler thread for log(N CPUs)") \ 3421 \ 3422 develop(intx, CIFireOOMAt, -1, \ 3423 "Fire OutOfMemoryErrors throughout CI for testing the compiler " \ 3424 "(non-negative value throws OOM after this many CI accesses " \ 3425 "in each compile)") \ 3426 notproduct(intx, CICrashAt, -1, \ 3427 "id of compilation to trigger assert in compiler thread for " \ 3428 "the purpose of testing, e.g. generation of replay data") \ 3429 notproduct(bool, CIObjectFactoryVerify, false, \ 3430 "enable potentially expensive verification in ciObjectFactory") \ 3431 \ 3432 /* Priorities */ \ 3433 product_pd(bool, UseThreadPriorities, "Use native thread priorities") \ 3434 \ 3435 product(intx, ThreadPriorityPolicy, 0, \ 3436 "0 : Normal. "\ 3437 " VM chooses priorities that are appropriate for normal "\ 3438 " applications. On Solaris NORM_PRIORITY and above are mapped "\ 3439 " to normal native priority. Java priorities below " \ 3440 " NORM_PRIORITY map to lower native priority values. On "\ 3441 " Windows applications are allowed to use higher native "\ 3442 " priorities. However, with ThreadPriorityPolicy=0, VM will "\ 3443 " not use the highest possible native priority, "\ 3444 " THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with "\ 3445 " system threads. On Linux thread priorities are ignored "\ 3446 " because the OS does not support static priority in "\ 3447 " SCHED_OTHER scheduling class which is the only choice for "\ 3448 " non-root, non-realtime applications. "\ 3449 "1 : Aggressive. "\ 3450 " Java thread priorities map over to the entire range of "\ 3451 " native thread priorities. Higher Java thread priorities map "\ 3452 " to higher native thread priorities. This policy should be "\ 3453 " used with care, as sometimes it can cause performance "\ 3454 " degradation in the application and/or the entire system. On "\ 3455 " Linux this policy requires root privilege.") \ 3456 \ 3457 product(bool, ThreadPriorityVerbose, false, \ 3458 "Print priority changes") \ 3459 \ 3460 product(intx, DefaultThreadPriority, -1, \ 3461 "The native priority at which threads run if not elsewhere " \ 3462 "specified (-1 means no change)") \ 3463 \ 3464 product(intx, CompilerThreadPriority, -1, \ 3465 "The native priority at which compiler threads should run " \ 3466 "(-1 means no change)") \ 3467 \ 3468 product(intx, VMThreadPriority, -1, \ 3469 "The native priority at which the VM thread should run " \ 3470 "(-1 means no change)") \ 3471 \ 3472 product(bool, CompilerThreadHintNoPreempt, true, \ 3473 "(Solaris only) Give compiler threads an extra quanta") \ 3474 \ 3475 product(bool, VMThreadHintNoPreempt, false, \ 3476 "(Solaris only) Give VM thread an extra quanta") \ 3477 \ 3478 product(intx, JavaPriority1_To_OSPriority, -1, \ 3479 "Map Java priorities to OS priorities") \ 3480 \ 3481 product(intx, JavaPriority2_To_OSPriority, -1, \ 3482 "Map Java priorities to OS priorities") \ 3483 \ 3484 product(intx, JavaPriority3_To_OSPriority, -1, \ 3485 "Map Java priorities to OS priorities") \ 3486 \ 3487 product(intx, JavaPriority4_To_OSPriority, -1, \ 3488 "Map Java priorities to OS priorities") \ 3489 \ 3490 product(intx, JavaPriority5_To_OSPriority, -1, \ 3491 "Map Java priorities to OS priorities") \ 3492 \ 3493 product(intx, JavaPriority6_To_OSPriority, -1, \ 3494 "Map Java priorities to OS priorities") \ 3495 \ 3496 product(intx, JavaPriority7_To_OSPriority, -1, \ 3497 "Map Java priorities to OS priorities") \ 3498 \ 3499 product(intx, JavaPriority8_To_OSPriority, -1, \ 3500 "Map Java priorities to OS priorities") \ 3501 \ 3502 product(intx, JavaPriority9_To_OSPriority, -1, \ 3503 "Map Java priorities to OS priorities") \ 3504 \ 3505 product(intx, JavaPriority10_To_OSPriority,-1, \ 3506 "Map Java priorities to OS priorities") \ 3507 \ 3508 experimental(bool, UseCriticalJavaThreadPriority, false, \ 3509 "Java thread priority 10 maps to critical scheduling priority") \ 3510 \ 3511 experimental(bool, UseCriticalCompilerThreadPriority, false, \ 3512 "Compiler thread(s) run at critical scheduling priority") \ 3513 \ 3514 experimental(bool, UseCriticalCMSThreadPriority, false, \ 3515 "ConcurrentMarkSweep thread runs at critical scheduling priority")\ 3516 \ 3517 /* compiler debugging */ \ 3518 notproduct(intx, CompileTheWorldStartAt, 1, \ 3519 "First class to consider when using +CompileTheWorld") \ 3520 \ 3521 notproduct(intx, CompileTheWorldStopAt, max_jint, \ 3522 "Last class to consider when using +CompileTheWorld") \ 3523 \ 3524 develop(intx, NewCodeParameter, 0, \ 3525 "Testing Only: Create a dedicated integer parameter before " \ 3526 "putback") \ 3527 \ 3528 /* new oopmap storage allocation */ \ 3529 develop(intx, MinOopMapAllocation, 8, \ 3530 "Minimum number of OopMap entries in an OopMapSet") \ 3531 \ 3532 /* Background Compilation */ \ 3533 develop(intx, LongCompileThreshold, 50, \ 3534 "Used with +TraceLongCompiles") \ 3535 \ 3536 product(intx, StarvationMonitorInterval, 200, \ 3537 "Pause between each check (in milliseconds)") \ 3538 \ 3539 /* recompilation */ \ 3540 product_pd(intx, CompileThreshold, \ 3541 "number of interpreted method invocations before (re-)compiling") \ 3542 \ 3543 product(intx, Tier0InvokeNotifyFreqLog, 7, \ 3544 "Interpreter (tier 0) invocation notification frequency") \ 3545 \ 3546 product(intx, Tier2InvokeNotifyFreqLog, 11, \ 3547 "C1 without MDO (tier 2) invocation notification frequency") \ 3548 \ 3549 product(intx, Tier3InvokeNotifyFreqLog, 10, \ 3550 "C1 with MDO profiling (tier 3) invocation notification " \ 3551 "frequency") \ 3552 \ 3553 product(intx, Tier23InlineeNotifyFreqLog, 20, \ 3554 "Inlinee invocation (tiers 2 and 3) notification frequency") \ 3555 \ 3556 product(intx, Tier0BackedgeNotifyFreqLog, 10, \ 3557 "Interpreter (tier 0) invocation notification frequency") \ 3558 \ 3559 product(intx, Tier2BackedgeNotifyFreqLog, 14, \ 3560 "C1 without MDO (tier 2) invocation notification frequency") \ 3561 \ 3562 product(intx, Tier3BackedgeNotifyFreqLog, 13, \ 3563 "C1 with MDO profiling (tier 3) invocation notification " \ 3564 "frequency") \ 3565 \ 3566 product(intx, Tier2CompileThreshold, 0, \ 3567 "threshold at which tier 2 compilation is invoked") \ 3568 \ 3569 product(intx, Tier2BackEdgeThreshold, 0, \ 3570 "Back edge threshold at which tier 2 compilation is invoked") \ 3571 \ 3572 product(intx, Tier3InvocationThreshold, 200, \ 3573 "Compile if number of method invocations crosses this " \ 3574 "threshold") \ 3575 \ 3576 product(intx, Tier3MinInvocationThreshold, 100, \ 3577 "Minimum invocation to compile at tier 3") \ 3578 \ 3579 product(intx, Tier3CompileThreshold, 2000, \ 3580 "Threshold at which tier 3 compilation is invoked (invocation " \ 3581 "minimum must be satisfied") \ 3582 \ 3583 product(intx, Tier3BackEdgeThreshold, 60000, \ 3584 "Back edge threshold at which tier 3 OSR compilation is invoked") \ 3585 \ 3586 product(intx, Tier4InvocationThreshold, 5000, \ 3587 "Compile if number of method invocations crosses this " \ 3588 "threshold") \ 3589 \ 3590 product(intx, Tier4MinInvocationThreshold, 600, \ 3591 "Minimum invocation to compile at tier 4") \ 3592 \ 3593 product(intx, Tier4CompileThreshold, 15000, \ 3594 "Threshold at which tier 4 compilation is invoked (invocation " \ 3595 "minimum must be satisfied") \ 3596 \ 3597 product(intx, Tier4BackEdgeThreshold, 40000, \ 3598 "Back edge threshold at which tier 4 OSR compilation is invoked") \ 3599 \ 3600 product(intx, Tier3DelayOn, 5, \ 3601 "If C2 queue size grows over this amount per compiler thread " \ 3602 "stop compiling at tier 3 and start compiling at tier 2") \ 3603 \ 3604 product(intx, Tier3DelayOff, 2, \ 3605 "If C2 queue size is less than this amount per compiler thread " \ 3606 "allow methods compiled at tier 2 transition to tier 3") \ 3607 \ 3608 product(intx, Tier3LoadFeedback, 5, \ 3609 "Tier 3 thresholds will increase twofold when C1 queue size " \ 3610 "reaches this amount per compiler thread") \ 3611 \ 3612 product(intx, Tier4LoadFeedback, 3, \ 3613 "Tier 4 thresholds will increase twofold when C2 queue size " \ 3614 "reaches this amount per compiler thread") \ 3615 \ 3616 product(intx, TieredCompileTaskTimeout, 50, \ 3617 "Kill compile task if method was not used within " \ 3618 "given timeout in milliseconds") \ 3619 \ 3620 product(intx, TieredStopAtLevel, 4, \ 3621 "Stop at given compilation level") \ 3622 \ 3623 product(intx, Tier0ProfilingStartPercentage, 200, \ 3624 "Start profiling in interpreter if the counters exceed tier 3 " \ 3625 "thresholds by the specified percentage") \ 3626 \ 3627 product(uintx, IncreaseFirstTierCompileThresholdAt, 50, \ 3628 "Increase the compile threshold for C1 compilation if the code " \ 3629 "cache is filled by the specified percentage") \ 3630 \ 3631 product(intx, TieredRateUpdateMinTime, 1, \ 3632 "Minimum rate sampling interval (in milliseconds)") \ 3633 \ 3634 product(intx, TieredRateUpdateMaxTime, 25, \ 3635 "Maximum rate sampling interval (in milliseconds)") \ 3636 \ 3637 product_pd(bool, TieredCompilation, \ 3638 "Enable tiered compilation") \ 3639 \ 3640 product(bool, PrintTieredEvents, false, \ 3641 "Print tiered events notifications") \ 3642 \ 3643 product_pd(intx, OnStackReplacePercentage, \ 3644 "NON_TIERED number of method invocations/branches (expressed as " \ 3645 "% of CompileThreshold) before (re-)compiling OSR code") \ 3646 \ 3647 product(intx, InterpreterProfilePercentage, 33, \ 3648 "NON_TIERED number of method invocations/branches (expressed as " \ 3649 "% of CompileThreshold) before profiling in the interpreter") \ 3650 \ 3651 develop(intx, MaxRecompilationSearchLength, 10, \ 3652 "The maximum number of frames to inspect when searching for " \ 3653 "recompilee") \ 3654 \ 3655 develop(intx, MaxInterpretedSearchLength, 3, \ 3656 "The maximum number of interpreted frames to skip when searching "\ 3657 "for recompilee") \ 3658 \ 3659 develop(intx, DesiredMethodLimit, 8000, \ 3660 "The desired maximum method size (in bytecodes) after inlining") \ 3661 \ 3662 develop(intx, HugeMethodLimit, 8000, \ 3663 "Don't compile methods larger than this if " \ 3664 "+DontCompileHugeMethods") \ 3665 \ 3666 /* New JDK 1.4 reflection implementation */ \ 3667 \ 3668 develop(intx, FastSuperclassLimit, 8, \ 3669 "Depth of hardwired instanceof accelerator array") \ 3670 \ 3671 /* Properties for Java libraries */ \ 3672 \ 3673 product(uintx, MaxDirectMemorySize, 0, \ 3674 "Maximum total size of NIO direct-buffer allocations") \ 3675 \ 3676 /* Flags used for temporary code during development */ \ 3677 \ 3678 diagnostic(bool, UseNewCode, false, \ 3679 "Testing Only: Use the new version while testing") \ 3680 \ 3681 diagnostic(bool, UseNewCode2, false, \ 3682 "Testing Only: Use the new version while testing") \ 3683 \ 3684 diagnostic(bool, UseNewCode3, false, \ 3685 "Testing Only: Use the new version while testing") \ 3686 \ 3687 /* flags for performance data collection */ \ 3688 \ 3689 product(bool, UsePerfData, falseInEmbedded, \ 3690 "Flag to disable jvmstat instrumentation for performance testing "\ 3691 "and problem isolation purposes") \ 3692 \ 3693 product(bool, PerfDataSaveToFile, false, \ 3694 "Save PerfData memory to hsperfdata_<pid> file on exit") \ 3695 \ 3696 product(ccstr, PerfDataSaveFile, NULL, \ 3697 "Save PerfData memory to the specified absolute pathname. " \ 3698 "The string %p in the file name (if present) " \ 3699 "will be replaced by pid") \ 3700 \ 3701 product(intx, PerfDataSamplingInterval, 50, \ 3702 "Data sampling interval (in milliseconds)") \ 3703 \ 3704 develop(bool, PerfTraceDataCreation, false, \ 3705 "Trace creation of Performance Data Entries") \ 3706 \ 3707 develop(bool, PerfTraceMemOps, false, \ 3708 "Trace PerfMemory create/attach/detach calls") \ 3709 \ 3710 product(bool, PerfDisableSharedMem, false, \ 3711 "Store performance data in standard memory") \ 3712 \ 3713 product(intx, PerfDataMemorySize, 32*K, \ 3714 "Size of performance data memory region. Will be rounded " \ 3715 "up to a multiple of the native os page size.") \ 3716 \ 3717 product(intx, PerfMaxStringConstLength, 1024, \ 3718 "Maximum PerfStringConstant string length before truncation") \ 3719 \ 3720 product(bool, PerfAllowAtExitRegistration, false, \ 3721 "Allow registration of atexit() methods") \ 3722 \ 3723 product(bool, PerfBypassFileSystemCheck, false, \ 3724 "Bypass Win32 file system criteria checks (Windows Only)") \ 3725 \ 3726 product(intx, UnguardOnExecutionViolation, 0, \ 3727 "Unguard page and retry on no-execute fault (Win32 only) " \ 3728 "0=off, 1=conservative, 2=aggressive") \ 3729 \ 3730 /* Serviceability Support */ \ 3731 \ 3732 product(bool, ManagementServer, false, \ 3733 "Create JMX Management Server") \ 3734 \ 3735 product(bool, DisableAttachMechanism, false, \ 3736 "Disable mechanism that allows tools to attach to this VM") \ 3737 \ 3738 product(bool, StartAttachListener, false, \ 3739 "Always start Attach Listener at VM startup") \ 3740 \ 3741 manageable(bool, PrintConcurrentLocks, false, \ 3742 "Print java.util.concurrent locks in thread dump") \ 3743 \ 3744 product(bool, TransmitErrorReport, false, \ 3745 "Enable error report transmission on erroneous termination") \ 3746 \ 3747 product(ccstr, ErrorReportServer, NULL, \ 3748 "Override built-in error report server address") \ 3749 \ 3750 /* Shared spaces */ \ 3751 \ 3752 product(bool, UseSharedSpaces, true, \ 3753 "Use shared spaces for metadata") \ 3754 \ 3755 product(bool, RequireSharedSpaces, false, \ 3756 "Require shared spaces for metadata") \ 3757 \ 3758 product(bool, DumpSharedSpaces, false, \ 3759 "Special mode: JVM reads a class list, loads classes, builds " \ 3760 "shared spaces, and dumps the shared spaces to a file to be " \ 3761 "used in future JVM runs") \ 3762 \ 3763 product(bool, PrintSharedSpaces, false, \ 3764 "Print usage of shared spaces") \ 3765 \ 3766 product(uintx, SharedReadWriteSize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3767 "Size of read-write space for metadata (in bytes)") \ 3768 \ 3769 product(uintx, SharedReadOnlySize, NOT_LP64(12*M) LP64_ONLY(16*M), \ 3770 "Size of read-only space for metadata (in bytes)") \ 3771 \ 3772 product(uintx, SharedMiscDataSize, NOT_LP64(2*M) LP64_ONLY(4*M), \ 3773 "Size of the shared miscellaneous data area (in bytes)") \ 3774 \ 3775 product(uintx, SharedMiscCodeSize, 120*K, \ 3776 "Size of the shared miscellaneous code area (in bytes)") \ 3777 \ 3778 product(uintx, SharedBaseAddress, LP64_ONLY(32*G) \ 3779 NOT_LP64(LINUX_ONLY(2*G) NOT_LINUX(0)), \ 3780 "Address to allocate shared memory region for class data") \ 3781 \ 3782 diagnostic(bool, PrintMethodHandleStubs, false, \ 3783 "Print generated stub code for method handles") \ 3784 \ 3785 develop(bool, TraceMethodHandles, false, \ 3786 "trace internal method handle operations") \ 3787 \ 3788 diagnostic(bool, VerifyMethodHandles, trueInDebug, \ 3789 "perform extra checks when constructing method handles") \ 3790 \ 3791 diagnostic(bool, ShowHiddenFrames, false, \ 3792 "show method handle implementation frames (usually hidden)") \ 3793 \ 3794 experimental(bool, TrustFinalNonStaticFields, false, \ 3795 "trust final non-static declarations for constant folding") \ 3796 \ 3797 diagnostic(bool, FoldStableValues, true, \ 3798 "Optimize loads from stable fields (marked w/ @Stable)") \ 3799 \ 3800 develop(bool, TraceInvokeDynamic, false, \ 3801 "trace internal invoke dynamic operations") \ 3802 \ 3803 diagnostic(bool, PauseAtStartup, false, \ 3804 "Causes the VM to pause at startup time and wait for the pause " \ 3805 "file to be removed (default: ./vm.paused.<pid>)") \ 3806 \ 3807 diagnostic(ccstr, PauseAtStartupFile, NULL, \ 3808 "The file to create and for whose removal to await when pausing " \ 3809 "at startup. (default: ./vm.paused.<pid>)") \ 3810 \ 3811 diagnostic(bool, PauseAtExit, false, \ 3812 "Pause and wait for keypress on exit if a debugger is attached") \ 3813 \ 3814 product(bool, ExtendedDTraceProbes, false, \ 3815 "Enable performance-impacting dtrace probes") \ 3816 \ 3817 product(bool, DTraceMethodProbes, false, \ 3818 "Enable dtrace probes for method-entry and method-exit") \ 3819 \ 3820 product(bool, DTraceAllocProbes, false, \ 3821 "Enable dtrace probes for object allocation") \ 3822 \ 3823 product(bool, DTraceMonitorProbes, false, \ 3824 "Enable dtrace probes for monitor events") \ 3825 \ 3826 product(bool, RelaxAccessControlCheck, false, \ 3827 "Relax the access control checks in the verifier") \ 3828 \ 3829 diagnostic(bool, PrintDTraceDOF, false, \ 3830 "Print the DTrace DOF passed to the system for JSDT probes") \ 3831 \ 3832 product(uintx, StringTableSize, defaultStringTableSize, \ 3833 "Number of buckets in the interned String table") \ 3834 \ 3835 experimental(uintx, SymbolTableSize, defaultSymbolTableSize, \ 3836 "Number of buckets in the JVM internal Symbol table") \ 3837 \ 3838 product(bool, UseStringDeduplication, false, \ 3839 "Use string deduplication") \ 3840 \ 3841 product(bool, PrintStringDeduplicationStatistics, false, \ 3842 "Print string deduplication statistics") \ 3843 \ 3844 product(uintx, StringDeduplicationAgeThreshold, 3, \ 3845 "A string must reach this age (or be promoted to an old region) " \ 3846 "to be considered for deduplication") \ 3847 \ 3848 diagnostic(bool, StringDeduplicationResizeALot, false, \ 3849 "Force table resize every time the table is scanned") \ 3850 \ 3851 diagnostic(bool, StringDeduplicationRehashALot, false, \ 3852 "Force table rehash every time the table is scanned") \ 3853 \ 3854 develop(bool, TraceDefaultMethods, false, \ 3855 "Trace the default method processing steps") \ 3856 \ 3857 develop(bool, VerifyGenericSignatures, false, \ 3858 "Abort VM on erroneous or inconsistent generic signatures") \ 3859 \ 3860 diagnostic(bool, WhiteBoxAPI, false, \ 3861 "Enable internal testing APIs") \ 3862 \ 3863 product(bool, PrintGCCause, true, \ 3864 "Include GC cause in GC logging") \ 3865 \ 3866 experimental(intx, SurvivorAlignmentInBytes, 0, \ 3867 "Default survivor space alignment in bytes") \ 3868 \ 3869 product(bool , AllowNonVirtualCalls, false, \ 3870 "Obey the ACC_SUPER flag and allow invokenonvirtual calls") \ 3871 \ 3872 diagnostic(ccstr, SharedArchiveFile, NULL, \ 3873 "Override the default location of the CDS archive file") \ 3874 \ 3875 experimental(uintx, ArrayAllocatorMallocLimit, \ 3876 SOLARIS_ONLY(64*K) NOT_SOLARIS(max_uintx), \ 3877 "Allocation less than this value will be allocated " \ 3878 "using malloc. Larger allocations will use mmap.") \ 3879 \ 3880 experimental(bool, AlwaysAtomicAccesses, false, \ 3881 "Accesses to all variables should always be atomic") \ 3882 \ 3883 product(bool, EnableTracing, false, \ 3884 "Enable event-based tracing") \ 3885 \ 3886 product(bool, UseLockedTracing, false, \ 3887 "Use locked-tracing when doing event-based tracing") 3888 3889/* 3890 * Macros for factoring of globals 3891 */ 3892 3893// Interface macros 3894#define DECLARE_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3895#define DECLARE_PD_PRODUCT_FLAG(type, name, doc) extern "C" type name; 3896#define DECLARE_DIAGNOSTIC_FLAG(type, name, value, doc) extern "C" type name; 3897#define DECLARE_EXPERIMENTAL_FLAG(type, name, value, doc) extern "C" type name; 3898#define DECLARE_MANAGEABLE_FLAG(type, name, value, doc) extern "C" type name; 3899#define DECLARE_PRODUCT_RW_FLAG(type, name, value, doc) extern "C" type name; 3900#ifdef PRODUCT 3901#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type CONST_##name; const type name = value; 3902#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type CONST_##name; const type name = pd_##name; 3903#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type CONST_##name; 3904#else 3905#define DECLARE_DEVELOPER_FLAG(type, name, value, doc) extern "C" type name; 3906#define DECLARE_PD_DEVELOPER_FLAG(type, name, doc) extern "C" type name; 3907#define DECLARE_NOTPRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3908#endif 3909// Special LP64 flags, product only needed for now. 3910#ifdef _LP64 3911#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) extern "C" type name; 3912#else 3913#define DECLARE_LP64_PRODUCT_FLAG(type, name, value, doc) const type name = value; 3914#endif // _LP64 3915 3916// Implementation macros 3917#define MATERIALIZE_PRODUCT_FLAG(type, name, value, doc) type name = value; 3918#define MATERIALIZE_PD_PRODUCT_FLAG(type, name, doc) type name = pd_##name; 3919#define MATERIALIZE_DIAGNOSTIC_FLAG(type, name, value, doc) type name = value; 3920#define MATERIALIZE_EXPERIMENTAL_FLAG(type, name, value, doc) type name = value; 3921#define MATERIALIZE_MANAGEABLE_FLAG(type, name, value, doc) type name = value; 3922#define MATERIALIZE_PRODUCT_RW_FLAG(type, name, value, doc) type name = value; 3923#ifdef PRODUCT 3924#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type CONST_##name = value; 3925#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type CONST_##name = pd_##name; 3926#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type CONST_##name = value; 3927#else 3928#define MATERIALIZE_DEVELOPER_FLAG(type, name, value, doc) type name = value; 3929#define MATERIALIZE_PD_DEVELOPER_FLAG(type, name, doc) type name = pd_##name; 3930#define MATERIALIZE_NOTPRODUCT_FLAG(type, name, value, doc) type name = value; 3931#endif 3932#ifdef _LP64 3933#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) type name = value; 3934#else 3935#define MATERIALIZE_LP64_PRODUCT_FLAG(type, name, value, doc) /* flag is constant */ 3936#endif // _LP64 3937 3938RUNTIME_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) 3939 3940RUNTIME_OS_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PD_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_PD_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_NOTPRODUCT_FLAG) 3941 3942ARCH_FLAGS(DECLARE_DEVELOPER_FLAG, DECLARE_PRODUCT_FLAG, DECLARE_DIAGNOSTIC_FLAG, DECLARE_EXPERIMENTAL_FLAG, DECLARE_NOTPRODUCT_FLAG) 3943 3944// Extensions 3945 3946#include "runtime/globals_ext.hpp" 3947 3948#endif // SHARE_VM_RUNTIME_GLOBALS_HPP 3949