Mercurial > hg > truffle
view src/share/vm/services/g1MemoryPool.hpp @ 3763:e66f38dd58a9
Merge
author | ysr |
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date | Wed, 08 Jun 2011 08:39:53 -0700 |
parents | b52782ae3880 |
children | 8229bd737950 |
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/* * Copyright (c) 2007, 2011, Oracle and/or its affiliates. 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. * */ #ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP #ifndef SERIALGC #include "services/memoryPool.hpp" #include "services/memoryUsage.hpp" #endif class G1CollectedHeap; // This file contains the three classes that represent the memory // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and // G1OldGenPool. In G1, unlike our other GCs, we do not have a // physical space for each of those spaces. Instead, we allocate // regions for all three spaces out of a single pool of regions (that // pool basically covers the entire heap). As a result, the eden, // survivor, and old gen are considered logical spaces in G1, as each // is a set of non-contiguous regions. This is also reflected in the // way we map them to memory pools here. The easiest way to have done // this would have been to map the entire G1 heap to a single memory // pool. However, it's helpful to show how large the eden and survivor // get, as this does affect the performance and behavior of G1. Which // is why we introduce the three memory pools implemented here. // // See comments in g1MonitoringSupport.hpp for additional details // on this model. // // This class is shared by the three G1 memory pool classes // (G1EdenPool, G1SurvivorPool, G1OldGenPool). Given that the way we // calculate used / committed bytes for these three pools is related // (see comment above), we put the calculations in this class so that // we can easily share them among the subclasses. class G1MemoryPoolSuper : public CollectedMemoryPool { protected: G1CollectedHeap* _g1h; // Would only be called from subclasses. G1MemoryPoolSuper(G1CollectedHeap* g1h, const char* name, size_t init_size, bool support_usage_threshold); // The reason why all the code is in static methods is so that it // can be safely called from the constructors of the subclasses. static size_t undefined_max() { return (size_t) -1; } static size_t eden_space_committed(G1CollectedHeap* g1h); static size_t eden_space_used(G1CollectedHeap* g1h); static size_t survivor_space_committed(G1CollectedHeap* g1h); static size_t survivor_space_used(G1CollectedHeap* g1h); static size_t old_space_committed(G1CollectedHeap* g1h); static size_t old_space_used(G1CollectedHeap* g1h); }; // Memory pool that represents the G1 eden. class G1EdenPool : public G1MemoryPoolSuper { public: G1EdenPool(G1CollectedHeap* g1h); size_t used_in_bytes() { return eden_space_used(_g1h); } size_t max_size() const { return undefined_max(); } MemoryUsage get_memory_usage(); }; // Memory pool that represents the G1 survivor. class G1SurvivorPool : public G1MemoryPoolSuper { public: G1SurvivorPool(G1CollectedHeap* g1h); size_t used_in_bytes() { return survivor_space_used(_g1h); } size_t max_size() const { return undefined_max(); } MemoryUsage get_memory_usage(); }; // Memory pool that represents the G1 old gen. class G1OldGenPool : public G1MemoryPoolSuper { public: G1OldGenPool(G1CollectedHeap* g1h); size_t used_in_bytes() { return old_space_used(_g1h); } size_t max_size() const { return undefined_max(); } MemoryUsage get_memory_usage(); }; #endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP