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