53 lines
2.4 KiB
C++
53 lines
2.4 KiB
C++
/*
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* Copyright (c) 2013, 2018, Red Hat, Inc. All rights reserved.
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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/shenandoah/shenandoahMemoryPool.hpp"
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ShenandoahMemoryPool::ShenandoahMemoryPool(ShenandoahHeap* heap) :
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CollectedMemoryPool("Shenandoah",
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heap->initial_capacity(),
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heap->max_capacity(),
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true /* support_usage_threshold */),
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_heap(heap) {}
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MemoryUsage ShenandoahMemoryPool::get_memory_usage() {
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size_t initial = initial_size();
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size_t max = max_size();
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size_t used = used_in_bytes();
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size_t committed = _heap->committed();
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// These asserts can never fail: max is stable, and all updates to other values never overflow max.
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assert(initial <= max, "initial: " SIZE_FORMAT ", max: " SIZE_FORMAT, initial, max);
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assert(used <= max, "used: " SIZE_FORMAT ", max: " SIZE_FORMAT, used, max);
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assert(committed <= max, "committed: " SIZE_FORMAT ", max: " SIZE_FORMAT, committed, max);
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// Committed and used are updated concurrently and independently. They can momentarily break
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// the assert below, which would also fail in downstream code. To avoid that, adjust values
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// to make sense under the race. See JDK-8207200.
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committed = MAX2(used, committed);
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assert(used <= committed, "used: " SIZE_FORMAT ", committed: " SIZE_FORMAT, used, committed);
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return MemoryUsage(initial, used, committed, max);
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}
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