1 /* 2 * Copyright (c) 2003, 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_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<mtInternal> { 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 Metaspace, 60 Copy, 61 MarkSweepCompact, 62 ParNew, 63 ConcurrentMarkSweep, 64 PSScavenge, 65 PSMarkSweep, 66 G1YoungGen, 67 G1OldGen, 68 Epsilon, 69 }; 70 71 MemoryManager(); 72 73 int num_memory_pools() const { return _num_pools; } 74 MemoryPool* get_memory_pool(int index) { 75 assert(index >= 0 && index < _num_pools, "Invalid index"); 76 return _pools[index]; 77 } 78 79 void add_pool(MemoryPool* pool); 80 81 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; } 82 83 virtual instanceOop get_memory_manager_instance(TRAPS); 84 virtual MemoryManager::Name kind() { return MemoryManager::Abstract; } 85 virtual bool is_gc_memory_manager() { return false; } 86 virtual const char* name() = 0; 87 88 // GC support 89 void oops_do(OopClosure* f); 90 91 // Static factory methods to get a memory manager of a specific type 92 static MemoryManager* get_code_cache_memory_manager(); 93 static MemoryManager* get_metaspace_memory_manager(); 94 static GCMemoryManager* get_copy_memory_manager(); 95 static GCMemoryManager* get_msc_memory_manager(); 96 static GCMemoryManager* get_parnew_memory_manager(); 97 static GCMemoryManager* get_cms_memory_manager(); 98 static GCMemoryManager* get_psScavenge_memory_manager(); 99 static GCMemoryManager* get_psMarkSweep_memory_manager(); 100 static GCMemoryManager* get_g1YoungGen_memory_manager(); 101 static GCMemoryManager* get_g1OldGen_memory_manager(); 102 static GCMemoryManager* get_epsilon_memory_manager(); 103 }; 104 105 class CodeCacheMemoryManager : public MemoryManager { 106 private: 107 public: 108 CodeCacheMemoryManager() : MemoryManager() {} 109 110 MemoryManager::Name kind() { return MemoryManager::CodeCache; } 111 const char* name() { return "CodeCacheManager"; } 112 }; 113 114 class MetaspaceMemoryManager : public MemoryManager { 115 public: 116 MetaspaceMemoryManager() : MemoryManager() {} 117 118 MemoryManager::Name kind() { return MemoryManager::Metaspace; } 119 const char *name() { return "Metaspace Manager"; } 120 }; 121 122 class GCStatInfo : public ResourceObj { 123 private: 124 size_t _index; 125 jlong _start_time; 126 jlong _end_time; 127 128 // We keep memory usage of all memory pools 129 MemoryUsage* _before_gc_usage_array; 130 MemoryUsage* _after_gc_usage_array; 131 int _usage_array_size; 132 133 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc); 134 135 public: 136 GCStatInfo(int num_pools); 137 ~GCStatInfo(); 138 139 size_t gc_index() { return _index; } 140 jlong start_time() { return _start_time; } 141 jlong end_time() { return _end_time; } 142 int usage_array_size() { return _usage_array_size; } 143 MemoryUsage before_gc_usage_for_pool(int pool_index) { 144 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 145 return _before_gc_usage_array[pool_index]; 146 } 147 MemoryUsage after_gc_usage_for_pool(int pool_index) { 148 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 149 return _after_gc_usage_array[pool_index]; 150 } 151 152 MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; } 153 MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; } 154 155 void set_index(size_t index) { _index = index; } 156 void set_start_time(jlong time) { _start_time = time; } 157 void set_end_time(jlong time) { _end_time = time; } 158 void set_before_gc_usage(int pool_index, MemoryUsage usage) { 159 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 160 set_gc_usage(pool_index, usage, true /* before gc */); 161 } 162 void set_after_gc_usage(int pool_index, MemoryUsage usage) { 163 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 164 set_gc_usage(pool_index, usage, false /* after gc */); 165 } 166 167 void clear(); 168 }; 169 170 class GCMemoryManager : public MemoryManager { 171 private: 172 // TODO: We should unify the GCCounter and GCMemoryManager statistic 173 size_t _num_collections; 174 elapsedTimer _accumulated_timer; 175 elapsedTimer _gc_timer; // for measuring every GC duration 176 GCStatInfo* _last_gc_stat; 177 Mutex* _last_gc_lock; 178 GCStatInfo* _current_gc_stat; 179 int _num_gc_threads; 180 volatile bool _notification_enabled; 181 public: 182 GCMemoryManager(); 183 ~GCMemoryManager(); 184 185 void initialize_gc_stat_info(); 186 187 bool is_gc_memory_manager() { return true; } 188 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); } 189 size_t gc_count() { return _num_collections; } 190 int num_gc_threads() { return _num_gc_threads; } 191 void set_num_gc_threads(int count) { _num_gc_threads = count; } 192 193 void gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 194 bool recordAccumulatedGCTime); 195 void gc_end(bool recordPostGCUsage, bool recordAccumulatedGCTime, 196 bool recordGCEndTime, bool countCollection, GCCause::Cause cause); 197 198 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); } 199 200 // Copy out _last_gc_stat to the given destination, returning 201 // the collection count. Zero signifies no gc has taken place. 202 size_t get_last_gc_stat(GCStatInfo* dest); 203 204 void set_notification_enabled(bool enabled) { _notification_enabled = enabled; } 205 bool is_notification_enabled() { return _notification_enabled; } 206 virtual MemoryManager::Name kind() = 0; 207 }; 208 209 // These subclasses of GCMemoryManager are defined to include 210 // GC-specific information. 211 // TODO: Add GC-specific information 212 class CopyMemoryManager : public GCMemoryManager { 213 private: 214 public: 215 CopyMemoryManager() : GCMemoryManager() {} 216 217 MemoryManager::Name kind() { return MemoryManager::Copy; } 218 const char* name() { return "Copy"; } 219 }; 220 221 class MSCMemoryManager : public GCMemoryManager { 222 private: 223 public: 224 MSCMemoryManager() : GCMemoryManager() {} 225 226 MemoryManager::Name kind() { return MemoryManager::MarkSweepCompact; } 227 const char* name() { return "MarkSweepCompact"; } 228 229 }; 230 231 class ParNewMemoryManager : public GCMemoryManager { 232 private: 233 public: 234 ParNewMemoryManager() : GCMemoryManager() {} 235 236 MemoryManager::Name kind() { return MemoryManager::ParNew; } 237 const char* name() { return "ParNew"; } 238 239 }; 240 241 class CMSMemoryManager : public GCMemoryManager { 242 private: 243 public: 244 CMSMemoryManager() : GCMemoryManager() {} 245 246 MemoryManager::Name kind() { return MemoryManager::ConcurrentMarkSweep; } 247 const char* name() { return "ConcurrentMarkSweep";} 248 249 }; 250 251 class PSScavengeMemoryManager : public GCMemoryManager { 252 private: 253 public: 254 PSScavengeMemoryManager() : GCMemoryManager() {} 255 256 MemoryManager::Name kind() { return MemoryManager::PSScavenge; } 257 const char* name() { return "PS Scavenge"; } 258 259 }; 260 261 class PSMarkSweepMemoryManager : public GCMemoryManager { 262 private: 263 public: 264 PSMarkSweepMemoryManager() : GCMemoryManager() {} 265 266 MemoryManager::Name kind() { return MemoryManager::PSMarkSweep; } 267 const char* name() { return "PS MarkSweep"; } 268 }; 269 270 class G1YoungGenMemoryManager : public GCMemoryManager { 271 private: 272 public: 273 G1YoungGenMemoryManager() : GCMemoryManager() {} 274 275 MemoryManager::Name kind() { return MemoryManager::G1YoungGen; } 276 const char* name() { return "G1 Young Generation"; } 277 }; 278 279 class G1OldGenMemoryManager : public GCMemoryManager { 280 private: 281 public: 282 G1OldGenMemoryManager() : GCMemoryManager() {} 283 284 MemoryManager::Name kind() { return MemoryManager::G1OldGen; } 285 const char* name() { return "G1 Old Generation"; } 286 }; 287 288 class EpsilonMemoryManager : public GCMemoryManager { 289 private: 290 public: 291 EpsilonMemoryManager() : GCMemoryManager() {} 292 293 MemoryManager::Name kind() { return MemoryManager::Epsilon; } 294 const char* name() { return "Epsilon Generation"; } 295 }; 296 297 #endif // SHARE_VM_SERVICES_MEMORYMANAGER_HPP