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 32 class MemoryPool; 33 class GCMemoryManager; 34 class OopClosure; 35 36 class MemoryManager : public CHeapObj { 37 private: 38 enum { 39 max_num_pools = 10 40 }; 41 42 MemoryPool* _pools[max_num_pools]; 43 int _num_pools; 44 45 protected: 46 volatile instanceOop _memory_mgr_obj; 47 48 public: 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 95 class CodeCacheMemoryManager : public MemoryManager { 96 private: 97 public: 98 CodeCacheMemoryManager() : MemoryManager() {} 99 100 MemoryManager::Name kind() { return MemoryManager::CodeCache; } 101 const char* name() { return "CodeCacheManager"; } 102 }; 103 104 class GCStatInfo : public CHeapObj { 105 private: 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); 116 117 public: 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 MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; } 135 MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; } 136 137 void set_index(size_t index) { _index = index; } 138 void set_start_time(jlong time) { _start_time = time; } 139 void set_end_time(jlong time) { _end_time = time; } 140 void set_before_gc_usage(int pool_index, MemoryUsage usage) { 141 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 142 set_gc_usage(pool_index, usage, true /* before gc */); 143 } 144 void set_after_gc_usage(int pool_index, MemoryUsage usage) { 145 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 146 set_gc_usage(pool_index, usage, false /* after gc */); 147 } 148 149 void clear(); 150 }; 151 152 class GCMemoryManager : public MemoryManager { 153 private: 154 // TODO: We should unify the GCCounter and GCMemoryManager statistic 155 size_t _num_collections; 156 elapsedTimer _accumulated_timer; 157 elapsedTimer _gc_timer; // for measuring every GC duration 158 GCStatInfo* _last_gc_stat; 159 Mutex* _last_gc_lock; 160 GCStatInfo* _current_gc_stat; 161 int _num_gc_threads; 162 public: 163 GCMemoryManager(); 164 ~GCMemoryManager(); 165 166 void initialize_gc_stat_info(); 167 168 bool is_gc_memory_manager() { return true; } 169 jlong gc_time_ms() { return _accumulated_timer.milliseconds(); } 170 size_t gc_count() { return _num_collections; } 171 int num_gc_threads() { return _num_gc_threads; } 172 void set_num_gc_threads(int count) { _num_gc_threads = count; } 173 174 void gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 175 bool recordAccumulatedGCTime); 176 void gc_end(bool recordPostGCUsage, bool recordAccumulatedGCTime, 177 bool recordGCEndTime, bool countCollection); 178 179 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); } 180 181 // Copy out _last_gc_stat to the given destination, returning the size of 182 // the arrays of pools. Zero signifies no gc has taken place. 183 size_t get_last_gc_stat(GCStatInfo* dest); 184 185 virtual MemoryManager::Name kind() = 0; 186 }; 187 188 // These subclasses of GCMemoryManager are defined to include 189 // GC-specific information. 190 // TODO: Add GC-specific information 191 class CopyMemoryManager : public GCMemoryManager { 192 private: 193 public: 194 CopyMemoryManager() : GCMemoryManager() {} 195 196 MemoryManager::Name kind() { return MemoryManager::Copy; } 197 const char* name() { return "Copy"; } 198 }; 199 200 class MSCMemoryManager : public GCMemoryManager { 201 private: 202 public: 203 MSCMemoryManager() : GCMemoryManager() {} 204 205 MemoryManager::Name kind() { return MemoryManager::MarkSweepCompact; } 206 const char* name() { return "MarkSweepCompact"; } 207 208 }; 209 210 class ParNewMemoryManager : public GCMemoryManager { 211 private: 212 public: 213 ParNewMemoryManager() : GCMemoryManager() {} 214 215 MemoryManager::Name kind() { return MemoryManager::ParNew; } 216 const char* name() { return "ParNew"; } 217 218 }; 219 220 class CMSMemoryManager : public GCMemoryManager { 221 private: 222 public: 223 CMSMemoryManager() : GCMemoryManager() {} 224 225 MemoryManager::Name kind() { return MemoryManager::ConcurrentMarkSweep; } 226 const char* name() { return "ConcurrentMarkSweep";} 227 228 }; 229 230 class PSScavengeMemoryManager : public GCMemoryManager { 231 private: 232 public: 233 PSScavengeMemoryManager() : GCMemoryManager() {} 234 235 MemoryManager::Name kind() { return MemoryManager::PSScavenge; } 236 const char* name() { return "PS Scavenge"; } 237 238 }; 239 240 class PSMarkSweepMemoryManager : public GCMemoryManager { 241 private: 242 public: 243 PSMarkSweepMemoryManager() : GCMemoryManager() {} 244 245 MemoryManager::Name kind() { return MemoryManager::PSMarkSweep; } 246 const char* name() { return "PS MarkSweep"; } 247 }; 248 249 class G1YoungGenMemoryManager : public GCMemoryManager { 250 private: 251 public: 252 G1YoungGenMemoryManager() : GCMemoryManager() {} 253 254 MemoryManager::Name kind() { return MemoryManager::G1YoungGen; } 255 const char* name() { return "G1 Young Generation"; } 256 }; 257 258 class G1OldGenMemoryManager : public GCMemoryManager { 259 private: 260 public: 261 G1OldGenMemoryManager() : GCMemoryManager() {} 262 263 MemoryManager::Name kind() { return MemoryManager::G1OldGen; } 264 const char* name() { return "G1 Old Generation"; } 265 };