1 /* 2 * Copyright (c) 2003, 2010, 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_MEMORYMANAGER_HPP 26 #define SHARE_VM_SERVICES_MEMORYMANAGER_HPP 27 28 #include "memory/allocation.hpp" 29 #include "runtime/timer.hpp" 30 #include "services/memoryUsage.hpp" 31 32 // A memory manager is responsible for managing one or more memory pools. 33 // The garbage collector is one type of memory managers responsible 34 // for reclaiming memory occupied by unreachable objects. A Java virtual 35 // machine may have one or more memory managers. It may 36 // add or remove memory managers during execution. 37 // A memory pool can be managed by more than one memory managers. 38 39 class MemoryPool; 40 class GCMemoryManager; 41 class OopClosure; 42 43 class MemoryManager : public CHeapObj { 44 private: 45 enum { 46 max_num_pools = 10 47 }; 48 49 MemoryPool* _pools[max_num_pools]; 50 int _num_pools; 51 52 protected: 53 volatile instanceOop _memory_mgr_obj; 54 55 public: 56 enum Name { 57 Abstract, 58 CodeCache, 59 Copy, 60 MarkSweepCompact, 61 ParNew, 62 ConcurrentMarkSweep, 63 PSScavenge, 64 PSMarkSweep, 65 G1YoungGen, 66 G1OldGen 67 }; 68 69 MemoryManager(); 70 71 int num_memory_pools() const { return _num_pools; } 72 MemoryPool* get_memory_pool(int index) { 73 assert(index >= 0 && index < _num_pools, "Invalid index"); 74 return _pools[index]; 75 } 76 77 void add_pool(MemoryPool* pool); 78 79 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; } 80 81 virtual instanceOop get_memory_manager_instance(TRAPS); 82 virtual MemoryManager::Name kind() { return MemoryManager::Abstract; } 83 virtual bool is_gc_memory_manager() { return false; } 84 virtual const char* name() = 0; 85 86 // GC support 87 void oops_do(OopClosure* f); 88 89 // Static factory methods to get a memory manager of a specific type 90 static MemoryManager* get_code_cache_memory_manager(); 91 static GCMemoryManager* get_copy_memory_manager(); 92 static GCMemoryManager* get_msc_memory_manager(); 93 static GCMemoryManager* get_parnew_memory_manager(); 94 static GCMemoryManager* get_cms_memory_manager(); 95 static GCMemoryManager* get_psScavenge_memory_manager(); 96 static GCMemoryManager* get_psMarkSweep_memory_manager(); 97 static GCMemoryManager* get_g1YoungGen_memory_manager(); 98 static GCMemoryManager* get_g1OldGen_memory_manager(); 99 100 }; 101 102 class CodeCacheMemoryManager : public MemoryManager { 103 private: 104 public: 105 CodeCacheMemoryManager() : MemoryManager() {} 106 107 MemoryManager::Name kind() { return MemoryManager::CodeCache; } 108 const char* name() { return "CodeCacheManager"; } 109 }; 110 111 class GCStatInfo : public CHeapObj { 112 private: 113 size_t _index; 114 jlong _start_time; 115 jlong _end_time; 116 117 // We keep memory usage of all memory pools 118 MemoryUsage* _before_gc_usage_array; 119 MemoryUsage* _after_gc_usage_array; 120 int _usage_array_size; 121 122 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc); 123 124 public: 125 GCStatInfo(int num_pools); 126 ~GCStatInfo(); 127 128 size_t gc_index() { return _index; } 129 jlong start_time() { return _start_time; } 130 jlong end_time() { return _end_time; } 131 int usage_array_size() { return _usage_array_size; } 132 MemoryUsage before_gc_usage_for_pool(int pool_index) { 133 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 134 return _before_gc_usage_array[pool_index]; 135 } 136 MemoryUsage after_gc_usage_for_pool(int pool_index) { 137 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 138 return _after_gc_usage_array[pool_index]; 139 } 140 141 MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; } 142 MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; } 143 144 void set_index(size_t index) { _index = index; } 145 void set_start_time(jlong time) { _start_time = time; } 146 void set_end_time(jlong time) { _end_time = time; } 147 void set_before_gc_usage(int pool_index, MemoryUsage usage) { 148 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 149 set_gc_usage(pool_index, usage, true /* before gc */); 150 } 151 void set_after_gc_usage(int pool_index, MemoryUsage usage) { 152 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 153 set_gc_usage(pool_index, usage, false /* after gc */); 154 } 155 156 void clear(); 157 }; 158 159 class GCMemoryManager : public MemoryManager { 160 private: 161 // TODO: We should unify the GCCounter and GCMemoryManager statistic 162 size_t _num_collections; 163 elapsedTimer _accumulated_timer; 164 elapsedTimer _gc_timer; // for measuring every GC duration 165 GCStatInfo* _last_gc_stat; 166 Mutex* _last_gc_lock; 167 GCStatInfo* _current_gc_stat; 168 int _num_gc_threads; 169 public: 170 GCMemoryManager(); 171 ~GCMemoryManager(); 172 173 void initialize_gc_stat_info(); 174 175 bool is_gc_memory_manager() { return true; } 176 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); } 177 size_t gc_count() { return _num_collections; } 178 int num_gc_threads() { return _num_gc_threads; } 179 void set_num_gc_threads(int count) { _num_gc_threads = count; } 180 181 void gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 182 bool recordAccumulatedGCTime); 183 void gc_end(bool recordPostGCUsage, bool recordAccumulatedGCTime, 184 bool recordGCEndTime, bool countCollection); 185 186 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); } 187 188 // Copy out _last_gc_stat to the given destination, returning 189 // the collection count. Zero signifies no gc has taken place. 190 size_t get_last_gc_stat(GCStatInfo* dest); 191 192 virtual MemoryManager::Name kind() = 0; 193 }; 194 195 // These subclasses of GCMemoryManager are defined to include 196 // GC-specific information. 197 // TODO: Add GC-specific information 198 class CopyMemoryManager : public GCMemoryManager { 199 private: 200 public: 201 CopyMemoryManager() : GCMemoryManager() {} 202 203 MemoryManager::Name kind() { return MemoryManager::Copy; } 204 const char* name() { return "Copy"; } 205 }; 206 207 class MSCMemoryManager : public GCMemoryManager { 208 private: 209 public: 210 MSCMemoryManager() : GCMemoryManager() {} 211 212 MemoryManager::Name kind() { return MemoryManager::MarkSweepCompact; } 213 const char* name() { return "MarkSweepCompact"; } 214 215 }; 216 217 class ParNewMemoryManager : public GCMemoryManager { 218 private: 219 public: 220 ParNewMemoryManager() : GCMemoryManager() {} 221 222 MemoryManager::Name kind() { return MemoryManager::ParNew; } 223 const char* name() { return "ParNew"; } 224 225 }; 226 227 class CMSMemoryManager : public GCMemoryManager { 228 private: 229 public: 230 CMSMemoryManager() : GCMemoryManager() {} 231 232 MemoryManager::Name kind() { return MemoryManager::ConcurrentMarkSweep; } 233 const char* name() { return "ConcurrentMarkSweep";} 234 235 }; 236 237 class PSScavengeMemoryManager : public GCMemoryManager { 238 private: 239 public: 240 PSScavengeMemoryManager() : GCMemoryManager() {} 241 242 MemoryManager::Name kind() { return MemoryManager::PSScavenge; } 243 const char* name() { return "PS Scavenge"; } 244 245 }; 246 247 class PSMarkSweepMemoryManager : public GCMemoryManager { 248 private: 249 public: 250 PSMarkSweepMemoryManager() : GCMemoryManager() {} 251 252 MemoryManager::Name kind() { return MemoryManager::PSMarkSweep; } 253 const char* name() { return "PS MarkSweep"; } 254 }; 255 256 class G1YoungGenMemoryManager : public GCMemoryManager { 257 private: 258 public: 259 G1YoungGenMemoryManager() : GCMemoryManager() {} 260 261 MemoryManager::Name kind() { return MemoryManager::G1YoungGen; } 262 const char* name() { return "G1 Young Generation"; } 263 }; 264 265 class G1OldGenMemoryManager : public GCMemoryManager { 266 private: 267 public: 268 G1OldGenMemoryManager() : GCMemoryManager() {} 269 270 MemoryManager::Name kind() { return MemoryManager::G1OldGen; } 271 const char* name() { return "G1 Old Generation"; } 272 }; 273 274 #endif // SHARE_VM_SERVICES_MEMORYMANAGER_HPP