1 /* 2 * Copyright (c) 2007, 2013, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 #ifndef SHARE_VM_SERVICES_G1MEMORYPOOL_HPP 26 #define SHARE_VM_SERVICES_G1MEMORYPOOL_HPP 27 28 #include "utilities/macros.hpp" 29 #if INCLUDE_ALL_GCS 30 #include "gc_implementation/g1/g1MonitoringSupport.hpp" 31 #include "services/memoryPool.hpp" 32 #include "services/memoryUsage.hpp" 33 #endif // INCLUDE_ALL_GCS 34 35 // This file contains the three classes that represent the memory 36 // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and 37 // G1OldGenPool. In G1, unlike our other GCs, we do not have a 38 // physical space for each of those spaces. Instead, we allocate 39 // regions for all three spaces out of a single pool of regions (that 40 // pool basically covers the entire heap). As a result, the eden, 41 // survivor, and old gen are considered logical spaces in G1, as each 42 // is a set of non-contiguous regions. This is also reflected in the 43 // way we map them to memory pools here. The easiest way to have done 44 // this would have been to map the entire G1 heap to a single memory 45 // pool. However, it's helpful to show how large the eden and survivor 46 // get, as this does affect the performance and behavior of G1. Which 47 // is why we introduce the three memory pools implemented here. 48 // 49 // See comments in g1MonitoringSupport.hpp for additional details 50 // on this model. 51 // 52 53 // This class is shared by the three G1 memory pool classes 54 // (G1EdenPool, G1SurvivorPool, G1OldGenPool). 55 class G1MemoryPoolSuper : public CollectedMemoryPool { 56 protected: 57 const static size_t _undefined_max = (size_t) -1; 58 G1MonitoringSupport* _g1mm; 59 60 // Would only be called from subclasses. 61 G1MemoryPoolSuper(G1CollectedHeap* g1h, 62 const char* name, 63 size_t init_size, 64 size_t max_size, 65 bool support_usage_threshold); 66 }; 67 68 // Memory pool that represents the G1 eden. 69 class G1EdenPool : public G1MemoryPoolSuper { 70 public: 71 G1EdenPool(G1CollectedHeap* g1h); 72 used_in_bytes()73 size_t used_in_bytes() { 74 return _g1mm->eden_space_used(); 75 } max_size() const76 size_t max_size() const { 77 return _undefined_max; 78 } 79 MemoryUsage get_memory_usage(); 80 }; 81 82 // Memory pool that represents the G1 survivor. 83 class G1SurvivorPool : public G1MemoryPoolSuper { 84 public: 85 G1SurvivorPool(G1CollectedHeap* g1h); 86 used_in_bytes()87 size_t used_in_bytes() { 88 return _g1mm->survivor_space_used(); 89 } max_size() const90 size_t max_size() const { 91 return _undefined_max; 92 } 93 MemoryUsage get_memory_usage(); 94 }; 95 96 // Memory pool that represents the G1 old gen. 97 class G1OldGenPool : public G1MemoryPoolSuper { 98 public: 99 G1OldGenPool(G1CollectedHeap* g1h); 100 used_in_bytes()101 size_t used_in_bytes() { 102 return _g1mm->old_space_used(); 103 } max_size() const104 size_t max_size() const { 105 return _g1mm->old_gen_max(); 106 } 107 MemoryUsage get_memory_usage(); 108 }; 109 110 #endif // SHARE_VM_SERVICES_G1MEMORYPOOL_HPP 111