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 MemoryManager(); 57 58 int num_memory_pools() const { return _num_pools; } 59 MemoryPool* get_memory_pool(int index) { 60 assert(index >= 0 && index < _num_pools, "Invalid index"); 61 return _pools[index]; 62 } 63 64 void add_pool(MemoryPool* pool); 65 66 bool is_manager(instanceHandle mh) { return mh() == _memory_mgr_obj; } 67 68 virtual instanceOop get_memory_manager_instance(TRAPS); 69 virtual bool is_gc_memory_manager() { return false; } 70 virtual const char* name() = 0; 71 72 // GC support 73 void oops_do(OopClosure* f); 74 75 // Static factory methods to get a memory manager of a specific type 76 static MemoryManager* get_code_cache_memory_manager(); 77 static MemoryManager* get_metaspace_memory_manager(); 78 static GCMemoryManager* get_copy_memory_manager(); 79 static GCMemoryManager* get_msc_memory_manager(); 80 static GCMemoryManager* get_parnew_memory_manager(); 81 static GCMemoryManager* get_cms_memory_manager(); 82 static GCMemoryManager* get_psScavenge_memory_manager(); 83 static GCMemoryManager* get_psMarkSweep_memory_manager(); 84 static GCMemoryManager* get_g1YoungGen_memory_manager(); 85 static GCMemoryManager* get_g1OldGen_memory_manager(); 86 }; 87 88 class CodeCacheMemoryManager : public MemoryManager { 89 private: 90 public: 91 CodeCacheMemoryManager() : MemoryManager() {} 92 93 const char* name() { return "CodeCacheManager"; } 94 }; 95 96 class MetaspaceMemoryManager : public MemoryManager { 97 public: 98 MetaspaceMemoryManager() : MemoryManager() {} 99 100 const char* name() { return "Metaspace Manager"; } 101 }; 102 103 class GCStatInfo : public ResourceObj { 104 private: 105 size_t _index; 106 jlong _start_time; 107 jlong _end_time; 108 109 // We keep memory usage of all memory pools 110 MemoryUsage* _before_gc_usage_array; 111 MemoryUsage* _after_gc_usage_array; 112 int _usage_array_size; 113 114 void set_gc_usage(int pool_index, MemoryUsage, bool before_gc); 115 116 public: 117 GCStatInfo(int num_pools); 118 ~GCStatInfo(); 119 120 size_t gc_index() { return _index; } 121 jlong start_time() { return _start_time; } 122 jlong end_time() { return _end_time; } 123 int usage_array_size() { return _usage_array_size; } 124 MemoryUsage before_gc_usage_for_pool(int pool_index) { 125 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 126 return _before_gc_usage_array[pool_index]; 127 } 128 MemoryUsage after_gc_usage_for_pool(int pool_index) { 129 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 130 return _after_gc_usage_array[pool_index]; 131 } 132 133 MemoryUsage* before_gc_usage_array() { return _before_gc_usage_array; } 134 MemoryUsage* after_gc_usage_array() { return _after_gc_usage_array; } 135 136 void set_index(size_t index) { _index = index; } 137 void set_start_time(jlong time) { _start_time = time; } 138 void set_end_time(jlong time) { _end_time = time; } 139 void set_before_gc_usage(int pool_index, MemoryUsage usage) { 140 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 141 set_gc_usage(pool_index, usage, true /* before gc */); 142 } 143 void set_after_gc_usage(int pool_index, MemoryUsage usage) { 144 assert(pool_index >= 0 && pool_index < _usage_array_size, "Range checking"); 145 set_gc_usage(pool_index, usage, false /* after gc */); 146 } 147 148 void clear(); 149 }; 150 151 class GCMemoryManager : public MemoryManager { 152 private: 153 // TODO: We should unify the GCCounter and GCMemoryManager statistic 154 size_t _num_collections; 155 elapsedTimer _accumulated_timer; 156 elapsedTimer _gc_timer; // for measuring every GC duration 157 GCStatInfo* _last_gc_stat; 158 Mutex* _last_gc_lock; 159 GCStatInfo* _current_gc_stat; 160 int _num_gc_threads; 161 volatile bool _notification_enabled; 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, GCCause::Cause cause); 178 179 void reset_gc_stat() { _num_collections = 0; _accumulated_timer.reset(); } 180 181 // Copy out _last_gc_stat to the given destination, returning 182 // the collection count. Zero signifies no gc has taken place. 183 size_t get_last_gc_stat(GCStatInfo* dest); 184 185 void set_notification_enabled(bool enabled) { _notification_enabled = enabled; } 186 bool is_notification_enabled() { return _notification_enabled; } 187 }; 188 189 // These subclasses of GCMemoryManager are defined to include 190 // GC-specific information. 191 // TODO: Add GC-specific information 192 class CopyMemoryManager : public GCMemoryManager { 193 private: 194 public: 195 CopyMemoryManager() : GCMemoryManager() {} 196 197 const char* name() { return "Copy"; } 198 }; 199 200 class MSCMemoryManager : public GCMemoryManager { 201 private: 202 public: 203 MSCMemoryManager() : GCMemoryManager() {} 204 205 const char* name() { return "MarkSweepCompact"; } 206 }; 207 208 class ParNewMemoryManager : public GCMemoryManager { 209 private: 210 public: 211 ParNewMemoryManager() : GCMemoryManager() {} 212 213 const char* name() { return "ParNew"; } 214 }; 215 216 class CMSMemoryManager : public GCMemoryManager { 217 private: 218 public: 219 CMSMemoryManager() : GCMemoryManager() {} 220 221 const char* name() { return "ConcurrentMarkSweep";} 222 }; 223 224 class PSScavengeMemoryManager : public GCMemoryManager { 225 private: 226 public: 227 PSScavengeMemoryManager() : GCMemoryManager() {} 228 229 const char* name() { return "PS Scavenge"; } 230 }; 231 232 class PSMarkSweepMemoryManager : public GCMemoryManager { 233 private: 234 public: 235 PSMarkSweepMemoryManager() : GCMemoryManager() {} 236 237 const char* name() { return "PS MarkSweep"; } 238 }; 239 240 class G1YoungGenMemoryManager : public GCMemoryManager { 241 private: 242 public: 243 G1YoungGenMemoryManager() : GCMemoryManager() {} 244 245 const char* name() { return "G1 Young Generation"; } 246 }; 247 248 class G1OldGenMemoryManager : public GCMemoryManager { 249 private: 250 public: 251 G1OldGenMemoryManager() : GCMemoryManager() {} 252 253 const char* name() { return "G1 Old Generation"; } 254 }; 255 256 #endif // SHARE_VM_SERVICES_MEMORYMANAGER_HPP