1 /* 2 * Copyright (c) 2007, 2017, 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_GC_G1_G1MEMORYPOOL_HPP 26 #define SHARE_VM_GC_G1_G1MEMORYPOOL_HPP 27 28 #include "gc/g1/g1MonitoringSupport.hpp" 29 #include "services/memoryPool.hpp" 30 #include "services/memoryUsage.hpp" 31 32 // This file contains the three classes that represent the memory 33 // pools of the G1 spaces: G1EdenPool, G1SurvivorPool, and 34 // G1OldGenPool. In G1, unlike our other GCs, we do not have a 35 // physical space for each of those spaces. Instead, we allocate 36 // regions for all three spaces out of a single pool of regions (that 37 // pool basically covers the entire heap). As a result, the eden, 38 // survivor, and old gen are considered logical spaces in G1, as each 39 // is a set of non-contiguous regions. This is also reflected in the 40 // way we map them to memory pools here. The easiest way to have done 41 // this would have been to map the entire G1 heap to a single memory 42 // pool. However, it's helpful to show how large the eden and survivor 43 // get, as this does affect the performance and behavior of G1. Which 44 // is why we introduce the three memory pools implemented here. 45 // 46 // See comments in g1MonitoringSupport.hpp for additional details 47 // on this model. 48 // 49 50 class G1CollectedHeap; 51 52 // This class is shared by the three G1 memory pool classes 53 // (G1EdenPool, G1SurvivorPool, G1OldGenPool). 54 class G1MemoryPoolSuper : public CollectedMemoryPool { 55 protected: 56 G1MonitoringSupport* _g1mm; 57 58 // Would only be called from subclasses. 59 G1MemoryPoolSuper(G1CollectedHeap* g1h, 60 const char* name, 61 size_t init_size, 62 size_t max_size, 63 bool support_usage_threshold); 64 }; 65 66 // Memory pool that represents the G1 eden. 67 class G1EdenPool : public G1MemoryPoolSuper { 68 public: 69 G1EdenPool(G1CollectedHeap* g1h, size_t initial_size); 70 71 size_t used_in_bytes() { return _g1mm->eden_space_used(); } 72 73 MemoryUsage get_memory_usage(); 74 }; 75 76 // Memory pool that represents the G1 survivor. 77 class G1SurvivorPool : public G1MemoryPoolSuper { 78 public: 79 G1SurvivorPool(G1CollectedHeap* g1h, size_t initial_size); 80 81 size_t used_in_bytes() { return _g1mm->survivor_space_used(); } 82 83 MemoryUsage get_memory_usage(); 84 }; 85 86 // Memory pool that represents the G1 old gen. 87 class G1OldGenPool : public G1MemoryPoolSuper { 88 public: 89 G1OldGenPool(G1CollectedHeap* g1h, size_t initial_size, size_t max_size); 90 91 size_t used_in_bytes() { return _g1mm->old_gen_used(); } 92 93 MemoryUsage get_memory_usage(); 94 }; 95 96 #endif // SHARE_VM_GC_G1_G1MEMORYPOOL_HPP | 1 /* 2 * Copyright (c) 2007, 2018, 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_GC_G1_G1MEMORYPOOL_HPP 26 #define SHARE_VM_GC_G1_G1MEMORYPOOL_HPP 27 28 #include "gc/g1/g1MonitoringSupport.hpp" 29 #include "services/memoryPool.hpp" 30 #include "services/memoryUsage.hpp" 31 32 // This file contains definitions for two memory pool models for the G1 heap 33 // spaces. Which to use is determined by the G1UseLegacyMonitoring switch. If 34 // true, we use a model that defines three pools, G1EdenPool, G1SurvivorPool 35 // and G1OldPool. If false (the default), we use a more accurate model 36 // that defines two additional pools, G1HumongousPool and G1ArchivePool. 37 // 38 // In G1, unlike our other GCs, we do not have a contiguous virtual address 39 // space for each pool. The pools are logical spaces in G1, and each pool 40 // consists of a non-contiguous region set allocated out of a single region 41 // pool which covers the entire heap. This is also reflected in the way we 42 // map them to memory pools here. The easiest way to have done this would 43 // have been to map the entire G1 heap to a single memory pool. However, it 44 // is helpful to show how large each space gets, as their sizes affect G1's 45 // performance and behavior. 46 // 47 // See comments in g1MonitoringSupport.hpp for additional details on this 48 // model. 49 50 class G1CollectedHeap; 51 52 // This class is shared by all G1 memory pool classes: G1EdenPool, 53 // G1SurvivorPool, G1OldPool, G1HumongousPool, and G1ArchivePool 54 class G1MemoryPoolSuper : public CollectedMemoryPool { 55 protected: 56 G1MonitoringSupport* _g1mm; 57 58 // Would only be called from subclasses. 59 G1MemoryPoolSuper(G1CollectedHeap* g1h, 60 const char* name, 61 size_t init_size, 62 size_t max_size, 63 bool support_usage_threshold); 64 }; 65 66 // In legacy mode, G1EdenPool, G1SurvivorPool, and G1OldPool represent 67 // the G1 memory pools, and G1OldPool includes regions occupied by 68 // humongous and archive objects. 69 70 // Memory pool that represents the G1 eden space 71 class G1EdenPool : public G1MemoryPoolSuper { 72 public: 73 G1EdenPool(G1CollectedHeap* g1h, size_t initial_size); 74 size_t used_in_bytes() { return _g1mm->eden_space_used(); } 75 MemoryUsage get_memory_usage(); 76 }; 77 78 // Memory pool that represents the G1 survivor space 79 class G1SurvivorPool : public G1MemoryPoolSuper { 80 public: 81 G1SurvivorPool(G1CollectedHeap* g1h, size_t initial_size); 82 size_t used_in_bytes() { return _g1mm->survivor_space_used(); } 83 MemoryUsage get_memory_usage(); 84 }; 85 86 // Memory pool that represents the G1 old generation (legacy) 87 // or G1 old space (default) 88 class G1OldPool : public G1MemoryPoolSuper { 89 public: 90 G1OldPool(G1CollectedHeap* g1h, size_t initial_size, size_t max_size); 91 size_t used_in_bytes() { return _g1mm->old_space_used(); } 92 MemoryUsage get_memory_usage(); 93 }; 94 95 // The default model includes the three legacy pools plus G1ArchivePool 96 // and G1HumongousPool, and G1OldPool does not include regions occupied 97 // by humongous and archive objects. Instead, humongous and archive 98 // objects each get their own pool. 99 100 // Memory pool that represents the G1 archive space. The archive space 101 // contains read-only class metadata from the class data sharing archives. 102 class G1ArchivePool : public G1MemoryPoolSuper { 103 public: 104 G1ArchivePool(G1CollectedHeap* g1h, size_t initial_size); 105 size_t used_in_bytes() { return _g1mm->archive_space_used(); } 106 MemoryUsage get_memory_usage(); 107 }; 108 109 // Memory pool that represents the G1 humongous space 110 class G1HumongousPool : public G1MemoryPoolSuper { 111 public: 112 G1HumongousPool(G1CollectedHeap* g1h, size_t initial_size); 113 size_t used_in_bytes() { return _g1mm->humongous_space_used(); } 114 MemoryUsage get_memory_usage(); 115 }; 116 117 #endif // SHARE_VM_GC_G1_G1MEMORYPOOL_HPP |