97 lines
3.6 KiB
C++
97 lines
3.6 KiB
C++
/*
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* Copyright (c) 2017, Red Hat, Inc. and/or its affiliates.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*
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*/
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#include "precompiled.hpp"
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#include "gc/parallel/parallelArguments.hpp"
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#include "gc/parallel/parallelScavengeHeap.hpp"
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#include "gc/shared/adaptiveSizePolicy.hpp"
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#include "gc/shared/collectorPolicy.hpp"
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#include "gc/shared/gcArguments.inline.hpp"
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#include "runtime/globals.hpp"
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#include "runtime/globals_extension.hpp"
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#include "runtime/java.hpp"
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#include "runtime/vm_version.hpp"
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#include "utilities/defaultStream.hpp"
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size_t ParallelArguments::conservative_max_heap_alignment() {
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return CollectorPolicy::compute_heap_alignment();
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}
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void ParallelArguments::initialize() {
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GCArguments::initialize();
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assert(UseParallelGC || UseParallelOldGC, "Error");
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// Enable ParallelOld unless it was explicitly disabled (cmd line or rc file).
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if (FLAG_IS_DEFAULT(UseParallelOldGC)) {
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FLAG_SET_DEFAULT(UseParallelOldGC, true);
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}
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FLAG_SET_DEFAULT(UseParallelGC, true);
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// If no heap maximum was requested explicitly, use some reasonable fraction
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// of the physical memory, up to a maximum of 1GB.
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FLAG_SET_DEFAULT(ParallelGCThreads,
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Abstract_VM_Version::parallel_worker_threads());
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if (ParallelGCThreads == 0) {
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jio_fprintf(defaultStream::error_stream(),
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"The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n");
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vm_exit(1);
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}
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if (UseAdaptiveSizePolicy) {
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// We don't want to limit adaptive heap sizing's freedom to adjust the heap
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// unless the user actually sets these flags.
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if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) {
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FLAG_SET_DEFAULT(MinHeapFreeRatio, 0);
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}
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if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) {
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FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100);
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}
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}
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// If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the
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// SurvivorRatio has been set, reset their default values to SurvivorRatio +
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// 2. By doing this we make SurvivorRatio also work for Parallel Scavenger.
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// See CR 6362902 for details.
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if (!FLAG_IS_DEFAULT(SurvivorRatio)) {
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if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) {
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FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2);
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}
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if (FLAG_IS_DEFAULT(MinSurvivorRatio)) {
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FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2);
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}
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}
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if (UseParallelOldGC) {
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// Par compact uses lower default values since they are treated as
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// minimums. These are different defaults because of the different
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// interpretation and are not ergonomically set.
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if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) {
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FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1);
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}
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}
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}
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CollectedHeap* ParallelArguments::create_heap() {
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return create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>();
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}
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