8232365: Implementation for JEP 363: Remove the Concurrent Mark Sweep (CMS) Garbage Collector
Reviewed-by: kbarrett, tschatzl, erikj, coleenp, dholmes
/*
* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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#ifndef CPU_X86_GLOBALS_X86_HPP
#define CPU_X86_GLOBALS_X86_HPP
#include "utilities/globalDefinitions.hpp"
#include "utilities/macros.hpp"
// Sets the default values for platform dependent flags used by the runtime system.
// (see globals.hpp)
define_pd_global(bool, ImplicitNullChecks, true); // Generate code for implicit null checks
define_pd_global(bool, TrapBasedNullChecks, false); // Not needed on x86.
define_pd_global(bool, UncommonNullCast, true); // Uncommon-trap NULLs passed to check cast
define_pd_global(uintx, CodeCacheSegmentSize, 64 TIERED_ONLY(+64)); // Tiered compilation has large code-entry alignment.
// See 4827828 for this change. There is no globals_core_i486.hpp. I can't
// assign a different value for C2 without touching a number of files. Use
// #ifdef to minimize the change as it's late in Mantis. -- FIXME.
// c1 doesn't have this problem because the fix to 4858033 assures us
// the the vep is aligned at CodeEntryAlignment whereas c2 only aligns
// the uep and the vep doesn't get real alignment but just slops on by
// only assured that the entry instruction meets the 5 byte size requirement.
#if COMPILER2_OR_JVMCI
define_pd_global(intx, CodeEntryAlignment, 32);
#else
define_pd_global(intx, CodeEntryAlignment, 16);
#endif // COMPILER2_OR_JVMCI
define_pd_global(intx, OptoLoopAlignment, 16);
define_pd_global(intx, InlineFrequencyCount, 100);
define_pd_global(intx, InlineSmallCode, 1000);
#define DEFAULT_STACK_YELLOW_PAGES (NOT_WINDOWS(2) WINDOWS_ONLY(3))
#define DEFAULT_STACK_RED_PAGES (1)
#define DEFAULT_STACK_RESERVED_PAGES (NOT_WINDOWS(1) WINDOWS_ONLY(0))
#define MIN_STACK_YELLOW_PAGES DEFAULT_STACK_YELLOW_PAGES
#define MIN_STACK_RED_PAGES DEFAULT_STACK_RED_PAGES
#define MIN_STACK_RESERVED_PAGES (0)
#ifdef _LP64
// Java_java_net_SocketOutputStream_socketWrite0() uses a 64k buffer on the
// stack if compiled for unix and LP64. To pass stack overflow tests we need
// 20 shadow pages.
#define DEFAULT_STACK_SHADOW_PAGES (NOT_WIN64(20) WIN64_ONLY(7) DEBUG_ONLY(+2))
// For those clients that do not use write socket, we allow
// the min range value to be below that of the default
#define MIN_STACK_SHADOW_PAGES (NOT_WIN64(10) WIN64_ONLY(7) DEBUG_ONLY(+2))
#else
#define DEFAULT_STACK_SHADOW_PAGES (4 DEBUG_ONLY(+5))
#define MIN_STACK_SHADOW_PAGES DEFAULT_STACK_SHADOW_PAGES
#endif // _LP64
define_pd_global(intx, StackYellowPages, DEFAULT_STACK_YELLOW_PAGES);
define_pd_global(intx, StackRedPages, DEFAULT_STACK_RED_PAGES);
define_pd_global(intx, StackShadowPages, DEFAULT_STACK_SHADOW_PAGES);
define_pd_global(intx, StackReservedPages, DEFAULT_STACK_RESERVED_PAGES);
define_pd_global(bool, RewriteBytecodes, true);
define_pd_global(bool, RewriteFrequentPairs, true);
define_pd_global(uintx, TypeProfileLevel, 111);
define_pd_global(bool, CompactStrings, true);
define_pd_global(bool, PreserveFramePointer, false);
define_pd_global(intx, InitArrayShortSize, 8*BytesPerLong);
#if defined(_LP64) || defined(_WINDOWS)
define_pd_global(bool, ThreadLocalHandshakes, true);
#else
// get_thread() is slow on linux 32 bit, therefore off by default
define_pd_global(bool, ThreadLocalHandshakes, false);
#endif
#define ARCH_FLAGS(develop, \
product, \
diagnostic, \
experimental, \
notproduct, \
range, \
constraint, \
writeable) \
\
develop(bool, IEEEPrecision, true, \
"Enables IEEE precision (for INTEL only)") \
\
product(bool, UseStoreImmI16, true, \
"Use store immediate 16-bits value instruction on x86") \
\
product(intx, UseAVX, 3, \
"Highest supported AVX instructions set on x86/x64") \
range(0, 99) \
\
product(bool, UseCLMUL, false, \
"Control whether CLMUL instructions can be used on x86/x64") \
\
diagnostic(bool, UseIncDec, true, \
"Use INC, DEC instructions on x86") \
\
product(bool, UseNewLongLShift, false, \
"Use optimized bitwise shift left") \
\
product(bool, UseAddressNop, false, \
"Use '0F 1F [addr]' NOP instructions on x86 cpus") \
\
product(bool, UseXmmLoadAndClearUpper, true, \
"Load low part of XMM register and clear upper part") \
\
product(bool, UseXmmRegToRegMoveAll, false, \
"Copy all XMM register bits when moving value between registers") \
\
product(bool, UseXmmI2D, false, \
"Use SSE2 CVTDQ2PD instruction to convert Integer to Double") \
\
product(bool, UseXmmI2F, false, \
"Use SSE2 CVTDQ2PS instruction to convert Integer to Float") \
\
product(bool, UseUnalignedLoadStores, false, \
"Use SSE2 MOVDQU instruction for Arraycopy") \
\
product(bool, UseXMMForObjInit, false, \
"Use XMM/YMM MOVDQU instruction for Object Initialization") \
\
product(bool, UseFastStosb, false, \
"Use fast-string operation for zeroing: rep stosb") \
\
/* Use Restricted Transactional Memory for lock eliding */ \
product(bool, UseRTMLocking, false, \
"Enable RTM lock eliding for inflated locks in compiled code") \
\
experimental(bool, UseRTMForStackLocks, false, \
"Enable RTM lock eliding for stack locks in compiled code") \
\
product(bool, UseRTMDeopt, false, \
"Perform deopt and recompilation based on RTM abort ratio") \
\
product(int, RTMRetryCount, 5, \
"Number of RTM retries on lock abort or busy") \
range(0, max_jint) \
\
experimental(int, RTMSpinLoopCount, 100, \
"Spin count for lock to become free before RTM retry") \
range(0, max_jint) \
\
experimental(int, RTMAbortThreshold, 1000, \
"Calculate abort ratio after this number of aborts") \
range(0, max_jint) \
\
experimental(int, RTMLockingThreshold, 10000, \
"Lock count at which to do RTM lock eliding without " \
"abort ratio calculation") \
range(0, max_jint) \
\
experimental(int, RTMAbortRatio, 50, \
"Lock abort ratio at which to stop use RTM lock eliding") \
range(0, 100) /* natural range */ \
\
experimental(int, RTMTotalCountIncrRate, 64, \
"Increment total RTM attempted lock count once every n times") \
range(1, max_jint) \
constraint(RTMTotalCountIncrRateConstraintFunc,AfterErgo) \
\
experimental(intx, RTMLockingCalculationDelay, 0, \
"Number of milliseconds to wait before start calculating aborts " \
"for RTM locking") \
\
experimental(bool, UseRTMXendForLockBusy, true, \
"Use RTM Xend instead of Xabort when lock busy") \
\
/* assembler */ \
product(bool, UseCountLeadingZerosInstruction, false, \
"Use count leading zeros instruction") \
\
product(bool, UseCountTrailingZerosInstruction, false, \
"Use count trailing zeros instruction") \
\
product(bool, UseSSE42Intrinsics, false, \
"SSE4.2 versions of intrinsics") \
\
product(bool, UseBMI1Instructions, false, \
"Use BMI1 instructions") \
\
product(bool, UseBMI2Instructions, false, \
"Use BMI2 instructions") \
\
diagnostic(bool, UseLibmIntrinsic, true, \
"Use Libm Intrinsics") \
\
/* Minimum array size in bytes to use AVX512 intrinsics */ \
/* for copy, inflate and fill which don't bail out early based on any */ \
/* condition. When this value is set to zero compare operations like */ \
/* compare, vectorizedMismatch, compress can also use AVX512 intrinsics.*/\
diagnostic(int, AVX3Threshold, 4096, \
"Minimum array size in bytes to use AVX512 intrinsics" \
"for copy, inflate and fill. When this value is set as zero" \
"compare operations can also use AVX512 intrinsics.") \
range(0, max_jint)
#endif // CPU_X86_GLOBALS_X86_HPP