| /* |
| * Copyright (c) 2017, Red Hat, Inc. and/or its affiliates. |
| * 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. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #include "precompiled.hpp" |
| #include "gc/parallel/parallelArguments.hpp" |
| #include "gc/parallel/parallelScavengeHeap.hpp" |
| #include "gc/shared/adaptiveSizePolicy.hpp" |
| #include "gc/shared/collectorPolicy.hpp" |
| #include "gc/shared/gcArguments.inline.hpp" |
| #include "runtime/globals.hpp" |
| #include "runtime/globals_extension.hpp" |
| #include "runtime/java.hpp" |
| #include "runtime/vm_version.hpp" |
| #include "utilities/defaultStream.hpp" |
| |
| size_t ParallelArguments::conservative_max_heap_alignment() { |
| return CollectorPolicy::compute_heap_alignment(); |
| } |
| |
| void ParallelArguments::initialize() { |
| GCArguments::initialize(); |
| assert(UseParallelGC || UseParallelOldGC, "Error"); |
| // Enable ParallelOld unless it was explicitly disabled (cmd line or rc file). |
| if (FLAG_IS_DEFAULT(UseParallelOldGC)) { |
| FLAG_SET_DEFAULT(UseParallelOldGC, true); |
| } |
| FLAG_SET_DEFAULT(UseParallelGC, true); |
| |
| // If no heap maximum was requested explicitly, use some reasonable fraction |
| // of the physical memory, up to a maximum of 1GB. |
| FLAG_SET_DEFAULT(ParallelGCThreads, |
| Abstract_VM_Version::parallel_worker_threads()); |
| if (ParallelGCThreads == 0) { |
| jio_fprintf(defaultStream::error_stream(), |
| "The Parallel GC can not be combined with -XX:ParallelGCThreads=0\n"); |
| vm_exit(1); |
| } |
| |
| if (UseAdaptiveSizePolicy) { |
| // We don't want to limit adaptive heap sizing's freedom to adjust the heap |
| // unless the user actually sets these flags. |
| if (FLAG_IS_DEFAULT(MinHeapFreeRatio)) { |
| FLAG_SET_DEFAULT(MinHeapFreeRatio, 0); |
| } |
| if (FLAG_IS_DEFAULT(MaxHeapFreeRatio)) { |
| FLAG_SET_DEFAULT(MaxHeapFreeRatio, 100); |
| } |
| } |
| |
| // If InitialSurvivorRatio or MinSurvivorRatio were not specified, but the |
| // SurvivorRatio has been set, reset their default values to SurvivorRatio + |
| // 2. By doing this we make SurvivorRatio also work for Parallel Scavenger. |
| // See CR 6362902 for details. |
| if (!FLAG_IS_DEFAULT(SurvivorRatio)) { |
| if (FLAG_IS_DEFAULT(InitialSurvivorRatio)) { |
| FLAG_SET_DEFAULT(InitialSurvivorRatio, SurvivorRatio + 2); |
| } |
| if (FLAG_IS_DEFAULT(MinSurvivorRatio)) { |
| FLAG_SET_DEFAULT(MinSurvivorRatio, SurvivorRatio + 2); |
| } |
| } |
| |
| if (UseParallelOldGC) { |
| // Par compact uses lower default values since they are treated as |
| // minimums. These are different defaults because of the different |
| // interpretation and are not ergonomically set. |
| if (FLAG_IS_DEFAULT(MarkSweepDeadRatio)) { |
| FLAG_SET_DEFAULT(MarkSweepDeadRatio, 1); |
| } |
| } |
| } |
| |
| CollectedHeap* ParallelArguments::create_heap() { |
| return create_heap_with_policy<ParallelScavengeHeap, GenerationSizer>(); |
| } |