111 lines
3.7 KiB
C++
111 lines
3.7 KiB
C++
/*
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* Copyright (c) 2007, 2015, Oracle and/or its affiliates. All rights reserved.
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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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#ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
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#define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
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#include "utilities/macros.hpp"
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#if INCLUDE_ALL_GCS
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#include "gc/g1/g1MonitoringSupport.hpp"
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#include "services/memoryPool.hpp"
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#include "services/memoryUsage.hpp"
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#endif // INCLUDE_ALL_GCS
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// This file contains the three classes that represent the memory
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// pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and
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// G1OldGenPool. In G1, unlike our other GCs, we do not have a
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// physical space for each of those spaces. Instead, we allocate
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// regions for all three spaces out of a single pool of regions (that
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// pool basically covers the entire heap). As a result, the eden,
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// survivor, and old gen are considered logical spaces in G1, as each
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// is a set of non-contiguous regions. This is also reflected in the
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// way we map them to memory pools here. The easiest way to have done
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// this would have been to map the entire G1 heap to a single memory
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// pool. However, it's helpful to show how large the eden and survivor
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// get, as this does affect the performance and behavior of G1. Which
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// is why we introduce the three memory pools implemented here.
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//
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// See comments in g1MonitoringSupport.hpp for additional details
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// on this model.
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//
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// This class is shared by the three G1 memory pool classes
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// (G1EdenPool, G1SurvivorPool, G1OldGenPool).
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class G1MemoryPoolSuper : public CollectedMemoryPool {
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protected:
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const static size_t _undefined_max = (size_t) -1;
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G1MonitoringSupport* _g1mm;
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// Would only be called from subclasses.
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G1MemoryPoolSuper(G1CollectedHeap* g1h,
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const char* name,
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size_t init_size,
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size_t max_size,
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bool support_usage_threshold);
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};
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// Memory pool that represents the G1 eden.
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class G1EdenPool : public G1MemoryPoolSuper {
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public:
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G1EdenPool(G1CollectedHeap* g1h);
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size_t used_in_bytes() {
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return _g1mm->eden_space_used();
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}
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size_t max_size() const {
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return _undefined_max;
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}
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MemoryUsage get_memory_usage();
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};
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// Memory pool that represents the G1 survivor.
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class G1SurvivorPool : public G1MemoryPoolSuper {
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public:
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G1SurvivorPool(G1CollectedHeap* g1h);
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size_t used_in_bytes() {
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return _g1mm->survivor_space_used();
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}
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size_t max_size() const {
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return _undefined_max;
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}
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MemoryUsage get_memory_usage();
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};
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// Memory pool that represents the G1 old gen.
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class G1OldGenPool : public G1MemoryPoolSuper {
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public:
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G1OldGenPool(G1CollectedHeap* g1h);
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size_t used_in_bytes() {
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return _g1mm->old_space_used();
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}
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size_t max_size() const {
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return _g1mm->old_gen_max();
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}
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MemoryUsage get_memory_usage();
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};
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#endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP
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