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epsilonArguments.cpp
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epsilonArguments.cpp
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/*
* Copyright (c) 2017, 2018, Red Hat, Inc. 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.
*
* 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/epsilon/epsilonArguments.hpp"
#include "gc/epsilon/epsilonHeap.hpp"
#include "gc/shared/gcArguments.hpp"
#include "gc/shared/tlab_globals.hpp"
#include "runtime/globals.hpp"
#include "runtime/globals_extension.hpp"
size_t EpsilonArguments::conservative_max_heap_alignment() {
return UseLargePages ? os::large_page_size() : os::vm_page_size();
}
void EpsilonArguments::initialize() {
GCArguments::initialize();
assert(UseEpsilonGC, "Sanity");
// Forcefully exit when OOME is detected. Nothing we can do at that point.
if (FLAG_IS_DEFAULT(ExitOnOutOfMemoryError)) {
FLAG_SET_DEFAULT(ExitOnOutOfMemoryError, true);
}
if (EpsilonMaxTLABSize < MinTLABSize) {
log_warning(gc)("EpsilonMaxTLABSize < MinTLABSize, adjusting it to " SIZE_FORMAT, MinTLABSize);
EpsilonMaxTLABSize = MinTLABSize;
}
if (!EpsilonElasticTLAB && EpsilonElasticTLABDecay) {
log_warning(gc)("Disabling EpsilonElasticTLABDecay because EpsilonElasticTLAB is disabled");
FLAG_SET_DEFAULT(EpsilonElasticTLABDecay, false);
}
#ifdef COMPILER2
// Enable loop strip mining: there are still non-GC safepoints, no need to make it worse
if (FLAG_IS_DEFAULT(UseCountedLoopSafepoints)) {
FLAG_SET_DEFAULT(UseCountedLoopSafepoints, true);
if (FLAG_IS_DEFAULT(LoopStripMiningIter)) {
FLAG_SET_DEFAULT(LoopStripMiningIter, 1000);
}
}
#endif
}
void EpsilonArguments::initialize_alignments() {
size_t page_size = UseLargePages ? os::large_page_size() : os::vm_page_size();
size_t align = MAX2((size_t)os::vm_allocation_granularity(), page_size);
SpaceAlignment = align;
HeapAlignment = align;
}
CollectedHeap* EpsilonArguments::create_heap() {
return new EpsilonHeap();
}