1 /* 2 * Copyright (c) 2003, 2004, 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 // A memory pool represents the memory area that the VM manages. 26 // The Java virtual machine has at least one memory pool 27 // and it may create or remove memory pools during execution. 28 // A memory pool can belong to the heap or the non-heap memory. 29 // A Java virtual machine may also have memory pools belonging to 30 // both heap and non-heap memory. 31 32 // Forward declaration 33 class MemoryManager; 34 class SensorInfo; 35 class Generation; 36 class DefNewGeneration; 37 class PSPermGen; 38 class PermGen; 39 class ThresholdSupport; 40 41 class MemoryPool : public CHeapObj { 42 friend class MemoryManager; 43 public: 44 enum PoolType { 45 Heap = 1, 46 NonHeap = 2 47 }; 48 49 private: 50 enum { 51 max_num_managers = 5 52 }; 53 54 // We could make some of the following as performance counters 55 // for external monitoring. 56 const char* _name; 57 PoolType _type; 58 size_t _initial_size; 59 size_t _max_size; 60 bool _available_for_allocation; // Default is true 61 MemoryManager* _managers[max_num_managers]; 62 int _num_managers; 63 MemoryUsage _peak_usage; // Peak memory usage 64 MemoryUsage _after_gc_usage; // After GC memory usage 65 66 ThresholdSupport* _usage_threshold; 67 ThresholdSupport* _gc_usage_threshold; 68 69 SensorInfo* _usage_sensor; 70 SensorInfo* _gc_usage_sensor; 71 72 volatile instanceOop _memory_pool_obj; 73 74 void add_manager(MemoryManager* mgr); 75 76 public: 77 MemoryPool(const char* name, 78 PoolType type, 79 size_t init_size, 80 size_t max_size, 81 bool support_usage_threshold, 82 bool support_gc_threshold); 83 84 const char* name() { return _name; } 85 bool is_heap() { return _type == Heap; } 86 bool is_non_heap() { return _type == NonHeap; } 87 size_t initial_size() const { return _initial_size; } 88 int num_memory_managers() const { return _num_managers; } 89 // max size could be changed 90 virtual size_t max_size() const { return _max_size; } 91 92 bool is_pool(instanceHandle pool) { return (pool() == _memory_pool_obj); } 93 94 bool available_for_allocation() { return _available_for_allocation; } 95 bool set_available_for_allocation(bool value) { 96 bool prev = _available_for_allocation; 97 _available_for_allocation = value; 98 return prev; 99 } 100 101 MemoryManager* get_memory_manager(int index) { 102 assert(index >= 0 && index < _num_managers, "Invalid index"); 103 return _managers[index]; 104 } 105 106 // Records current memory usage if it's a peak usage 107 void record_peak_memory_usage(); 108 109 MemoryUsage get_peak_memory_usage() { 110 // check current memory usage first and then return peak usage 111 record_peak_memory_usage(); 112 return _peak_usage; 113 } 114 void reset_peak_memory_usage() { 115 _peak_usage = get_memory_usage(); 116 } 117 118 ThresholdSupport* usage_threshold() { return _usage_threshold; } 119 ThresholdSupport* gc_usage_threshold() { return _gc_usage_threshold; } 120 121 SensorInfo* usage_sensor() { return _usage_sensor; } 122 SensorInfo* gc_usage_sensor() { return _gc_usage_sensor; } 123 124 void set_usage_sensor_obj(instanceHandle s); 125 void set_gc_usage_sensor_obj(instanceHandle s); 126 void set_last_collection_usage(MemoryUsage u) { _after_gc_usage = u; } 127 128 virtual instanceOop get_memory_pool_instance(TRAPS); 129 virtual MemoryUsage get_memory_usage() = 0; 130 virtual size_t used_in_bytes() = 0; 131 virtual bool is_collected_pool() { return false; } 132 virtual MemoryUsage get_last_collection_usage() { return _after_gc_usage; } 133 134 // GC support 135 void oops_do(OopClosure* f); 136 }; 137 138 class CollectedMemoryPool : public MemoryPool { 139 public: 140 CollectedMemoryPool(const char* name, PoolType type, size_t init_size, size_t max_size, bool support_usage_threshold) : 141 MemoryPool(name, type, init_size, max_size, support_usage_threshold, true) {}; 142 bool is_collected_pool() { return true; } 143 }; 144 145 class ContiguousSpacePool : public CollectedMemoryPool { 146 private: 147 ContiguousSpace* _space; 148 149 public: 150 ContiguousSpacePool(ContiguousSpace* space, const char* name, PoolType type, size_t max_size, bool support_usage_threshold); 151 152 ContiguousSpace* space() { return _space; } 153 MemoryUsage get_memory_usage(); 154 size_t used_in_bytes() { return space()->used(); } 155 }; 156 157 class SurvivorContiguousSpacePool : public CollectedMemoryPool { 158 private: 159 DefNewGeneration* _gen; 160 161 public: 162 SurvivorContiguousSpacePool(DefNewGeneration* gen, 163 const char* name, 164 PoolType type, 165 size_t max_size, 166 bool support_usage_threshold); 167 168 MemoryUsage get_memory_usage(); 169 170 size_t used_in_bytes() { 171 return _gen->from()->used(); 172 } 173 size_t committed_in_bytes() { 174 return _gen->from()->capacity(); 175 } 176 }; 177 178 #ifndef SERIALGC 179 class CompactibleFreeListSpacePool : public CollectedMemoryPool { 180 private: 181 CompactibleFreeListSpace* _space; 182 public: 183 CompactibleFreeListSpacePool(CompactibleFreeListSpace* space, 184 const char* name, 185 PoolType type, 186 size_t max_size, 187 bool support_usage_threshold); 188 189 MemoryUsage get_memory_usage(); 190 size_t used_in_bytes() { return _space->used(); } 191 }; 192 #endif // SERIALGC 193 194 195 class GenerationPool : public CollectedMemoryPool { 196 private: 197 Generation* _gen; 198 public: 199 GenerationPool(Generation* gen, const char* name, PoolType type, bool support_usage_threshold); 200 201 MemoryUsage get_memory_usage(); 202 size_t used_in_bytes() { return _gen->used(); } 203 }; 204 205 class CodeHeapPool: public MemoryPool { 206 private: 207 CodeHeap* _codeHeap; 208 public: 209 CodeHeapPool(CodeHeap* codeHeap, const char* name, bool support_usage_threshold); 210 MemoryUsage get_memory_usage(); 211 size_t used_in_bytes() { return _codeHeap->allocated_capacity(); } 212 };