| /* |
| * Copyright (c) 2007, 2015, 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 |
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| * |
| */ |
| |
| #ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP |
| #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP |
| |
| #include "utilities/macros.hpp" |
| #if INCLUDE_ALL_GCS |
| #include "gc/g1/g1MonitoringSupport.hpp" |
| #include "services/memoryPool.hpp" |
| #include "services/memoryUsage.hpp" |
| #endif // INCLUDE_ALL_GCS |
| |
| // 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). |
| class G1MemoryPoolSuper : public CollectedMemoryPool { |
| protected: |
| const static size_t _undefined_max = (size_t) -1; |
| G1MonitoringSupport* _g1mm; |
| |
| // Would only be called from subclasses. |
| G1MemoryPoolSuper(G1CollectedHeap* g1h, |
| const char* name, |
| size_t init_size, |
| size_t max_size, |
| bool support_usage_threshold); |
| }; |
| |
| // Memory pool that represents the G1 eden. |
| class G1EdenPool : public G1MemoryPoolSuper { |
| public: |
| G1EdenPool(G1CollectedHeap* g1h); |
| |
| size_t used_in_bytes() { |
| return _g1mm->eden_space_used(); |
| } |
| 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 _g1mm->survivor_space_used(); |
| } |
| 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 _g1mm->old_space_used(); |
| } |
| size_t max_size() const { |
| return _g1mm->old_gen_max(); |
| } |
| MemoryUsage get_memory_usage(); |
| }; |
| |
| #endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP |