memoryManager.hpp revision 1472:c18cbe5936b8
1/* 2 * Copyright (c) 2003, 2005, 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 manager is responsible for managing one or more memory pools. 26// The garbage collector is one type of memory managers responsible 27// for reclaiming memory occupied by unreachable objects. A Java virtual 28// machine may have one or more memory managers. It may 29// add or remove memory managers during execution. 30// A memory pool can be managed by more than one memory managers. 31 32class MemoryPool; 33class GCMemoryManager; 34class OopClosure; 35 36class MemoryManager : public CHeapObj { 37private: 38 enum { 39 max_num_pools = 10 40 }; 41 42 MemoryPool* _pools[max_num_pools]; 43 int _num_pools; 44 45protected: 46 volatile instanceOop _memory_mgr_obj; 47 48public: 49 enum Name { 50 Abstract, 51 CodeCache, 52 Copy, 53 MarkSweepCompact, 54 ParNew, 55 ConcurrentMarkSweep, 56 PSScavenge, 57 PSMarkSweep, 58 G1YoungGen, 59 G1OldGen 60 }; 61 62 MemoryManager(); 63 64 int num_memory_pools() const { return _num_pools; } 65 MemoryPool* get_memory_pool(int index) { 66 assert(index >= 0 && index < _num_pools, "Invalid index"); 67 return _pools[index]; 68 } 69 70 void add_pool(MemoryPool* pool); 71 72 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; } 73 74 virtual instanceOop get_memory_manager_instance(TRAPS); 75 virtual MemoryManager::Name kind() { return MemoryManager::Abstract; } 76 virtual bool is_gc_memory_manager() { return false; } 77 virtual const char* name() = 0; 78 79 // GC support 80 void oops_do(OopClosure* f); 81 82 // Static factory methods to get a memory manager of a specific type 83 static MemoryManager* get_code_cache_memory_manager(); 84 static GCMemoryManager* get_copy_memory_manager(); 85 static GCMemoryManager* get_msc_memory_manager(); 86 static GCMemoryManager* get_parnew_memory_manager(); 87 static GCMemoryManager* get_cms_memory_manager(); 88 static GCMemoryManager* get_psScavenge_memory_manager(); 89 static GCMemoryManager* get_psMarkSweep_memory_manager(); 90 static GCMemoryManager* get_g1YoungGen_memory_manager(); 91 static GCMemoryManager* get_g1OldGen_memory_manager(); 92 93}; 94 95class CodeCacheMemoryManager : public MemoryManager { 96private: 97public: 98 CodeCacheMemoryManager() : MemoryManager() {} 99 100 MemoryManager::Name kind() { return MemoryManager::CodeCache; } 101 const char* name() { return "CodeCacheManager"; } 102}; 103 104class GCStatInfo : public CHeapObj { 105private: 106 size_t _index; 107 jlong _start_time; 108 jlong _end_time; 109 110 // We keep memory usage of all memory pools 111 MemoryUsage* _before_gc_usage_array; 112 MemoryUsage* _after_gc_usage_array; 113 int _usage_array_size; 114 115 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc); 116 117public: 118 GCStatInfo(int num_pools); 119 ~GCStatInfo(); 120 121 size_t gc_index() { return _index; } 122 jlong start_time() { return _start_time; } 123 jlong end_time() { return _end_time; } 124 int usage_array_size() { return _usage_array_size; } 125 MemoryUsage before_gc_usage_for_pool(int pool_index) { 126 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 127 return _before_gc_usage_array[pool_index]; 128 } 129 MemoryUsage after_gc_usage_for_pool(int pool_index) { 130 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 131 return _after_gc_usage_array[pool_index]; 132 } 133 134 void set_index(size_t index) { _index = index; } 135 void set_start_time(jlong time) { _start_time = time; } 136 void set_end_time(jlong time) { _end_time = time; } 137 void set_before_gc_usage(int pool_index, MemoryUsage usage) { 138 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 139 set_gc_usage(pool_index, usage, true /* before gc */); 140 } 141 void set_after_gc_usage(int pool_index, MemoryUsage usage) { 142 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 143 set_gc_usage(pool_index, usage, false /* after gc */); 144 } 145 146 void copy_stat(GCStatInfo* stat); 147}; 148 149class GCMemoryManager : public MemoryManager { 150private: 151 // TODO: We should unify the GCCounter and GCMemoryManager statistic 152 size_t _num_collections; 153 elapsedTimer _accumulated_timer; 154 elapsedTimer _gc_timer; // for measuring every GC duration 155 GCStatInfo* _last_gc_stat; 156 int _num_gc_threads; 157public: 158 GCMemoryManager(); 159 ~GCMemoryManager(); 160 161 void initialize_gc_stat_info(); 162 163 bool is_gc_memory_manager() { return true; } 164 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); } 165 size_t gc_count() { return _num_collections; } 166 int num_gc_threads() { return _num_gc_threads; } 167 void set_num_gc_threads(int count) { _num_gc_threads = count; } 168 169 void gc_begin(); 170 void gc_end(); 171 172 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); } 173 GCStatInfo* last_gc_stat() { return _last_gc_stat; } 174 175 virtual MemoryManager::Name kind() = 0; 176}; 177 178// These subclasses of GCMemoryManager are defined to include 179// GC-specific information. 180// TODO: Add GC-specific information 181class CopyMemoryManager : public GCMemoryManager { 182private: 183public: 184 CopyMemoryManager() : GCMemoryManager() {} 185 186 MemoryManager::Name kind() { return MemoryManager::Copy; } 187 const char* name() { return "Copy"; } 188}; 189 190class MSCMemoryManager : public GCMemoryManager { 191private: 192public: 193 MSCMemoryManager() : GCMemoryManager() {} 194 195 MemoryManager::Name kind() { return MemoryManager::MarkSweepCompact; } 196 const char* name() { return "MarkSweepCompact"; } 197 198}; 199 200class ParNewMemoryManager : public GCMemoryManager { 201private: 202public: 203 ParNewMemoryManager() : GCMemoryManager() {} 204 205 MemoryManager::Name kind() { return MemoryManager::ParNew; } 206 const char* name() { return "ParNew"; } 207 208}; 209 210class CMSMemoryManager : public GCMemoryManager { 211private: 212public: 213 CMSMemoryManager() : GCMemoryManager() {} 214 215 MemoryManager::Name kind() { return MemoryManager::ConcurrentMarkSweep; } 216 const char* name() { return "ConcurrentMarkSweep";} 217 218}; 219 220class PSScavengeMemoryManager : public GCMemoryManager { 221private: 222public: 223 PSScavengeMemoryManager() : GCMemoryManager() {} 224 225 MemoryManager::Name kind() { return MemoryManager::PSScavenge; } 226 const char* name() { return "PS Scavenge"; } 227 228}; 229 230class PSMarkSweepMemoryManager : public GCMemoryManager { 231private: 232public: 233 PSMarkSweepMemoryManager() : GCMemoryManager() {} 234 235 MemoryManager::Name kind() { return MemoryManager::PSMarkSweep; } 236 const char* name() { return "PS MarkSweep"; } 237}; 238 239class G1YoungGenMemoryManager : public GCMemoryManager { 240private: 241public: 242 G1YoungGenMemoryManager() : GCMemoryManager() {} 243 244 MemoryManager::Name kind() { return MemoryManager::G1YoungGen; } 245 const char* name() { return "G1 Young Generation"; } 246}; 247 248class G1OldGenMemoryManager : public GCMemoryManager { 249private: 250public: 251 G1OldGenMemoryManager() : GCMemoryManager() {} 252 253 MemoryManager::Name kind() { return MemoryManager::G1OldGen; } 254 const char* name() { return "G1 Old Generation"; } 255}; 256