149 150 void MemoryManager::oops_do(OopClosure* f) { 151 f->do_oop((oop*) &_memory_mgr_obj); 152 } 153 154 GCStatInfo::GCStatInfo(int num_pools) { 155 // initialize the arrays for memory usage 156 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); 157 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); 158 size_t len = num_pools * sizeof(MemoryUsage); 159 memset(_before_gc_usage_array, 0, len); 160 memset(_after_gc_usage_array, 0, len); 161 _usage_array_size = num_pools; 162 } 163 164 GCStatInfo::~GCStatInfo() { 165 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); 166 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); 167 } 168 169 void GCStatInfo::copy_stat(GCStatInfo* stat) { 170 set_index(stat->gc_index()); 171 set_start_time(stat->start_time()); 172 set_end_time(stat->end_time()); 173 assert(_usage_array_size == stat->usage_array_size(), "Must have same array size"); 174 for (int i = 0; i < _usage_array_size; i++) { 175 set_before_gc_usage(i, stat->before_gc_usage_for_pool(i)); 176 set_after_gc_usage(i, stat->after_gc_usage_for_pool(i)); 177 } 178 } 179 180 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { 181 MemoryUsage* gc_usage_array; 182 if (before_gc) { 183 gc_usage_array = _before_gc_usage_array; 184 } else { 185 gc_usage_array = _after_gc_usage_array; 186 } 187 gc_usage_array[pool_index] = usage; 188 } 189 190 GCMemoryManager::GCMemoryManager() : MemoryManager() { 191 _num_collections = 0; 192 _last_gc_stat = NULL; 193 _num_gc_threads = 1; 194 } 195 196 GCMemoryManager::~GCMemoryManager() { 197 delete _last_gc_stat; 198 } 199 200 void GCMemoryManager::initialize_gc_stat_info() { 201 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); 202 _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); 203 } 204 205 void GCMemoryManager::gc_begin() { 206 assert(_last_gc_stat != NULL, "Just checking"); 207 _accumulated_timer.start(); 208 _num_collections++; 209 _last_gc_stat->set_index(_num_collections); 210 _last_gc_stat->set_start_time(Management::timestamp()); 211 212 // Keep memory usage of all memory pools 213 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 214 MemoryPool* pool = MemoryService::get_memory_pool(i); 215 MemoryUsage usage = pool->get_memory_usage(); 216 _last_gc_stat->set_before_gc_usage(i, usage); 217 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin, 218 name(), strlen(name()), 219 pool->name(), strlen(pool->name()), 220 usage.init_size(), usage.used(), 221 usage.committed(), usage.max_size()); 222 } 223 } 224 225 void GCMemoryManager::gc_end() { 226 _accumulated_timer.stop(); 227 _last_gc_stat->set_end_time(Management::timestamp()); 228 229 int i; 230 // keep the last gc statistics for all memory pools 231 for (i = 0; i < MemoryService::num_memory_pools(); i++) { 232 MemoryPool* pool = MemoryService::get_memory_pool(i); 233 MemoryUsage usage = pool->get_memory_usage(); 234 235 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end, 236 name(), strlen(name()), 237 pool->name(), strlen(pool->name()), 238 usage.init_size(), usage.used(), 239 usage.committed(), usage.max_size()); 240 241 _last_gc_stat->set_after_gc_usage(i, usage); 242 } 243 244 // Set last collection usage of the memory pools managed by this collector 245 for (i = 0; i < num_memory_pools(); i++) { 246 MemoryPool* pool = get_memory_pool(i); 247 MemoryUsage usage = pool->get_memory_usage(); 248 249 // Compare with GC usage threshold 250 pool->set_last_collection_usage(usage); 251 LowMemoryDetector::detect_after_gc_memory(pool); 252 } 253 } | 149 150 void MemoryManager::oops_do(OopClosure* f) { 151 f->do_oop((oop*) &_memory_mgr_obj); 152 } 153 154 GCStatInfo::GCStatInfo(int num_pools) { 155 // initialize the arrays for memory usage 156 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); 157 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools); 158 size_t len = num_pools * sizeof(MemoryUsage); 159 memset(_before_gc_usage_array, 0, len); 160 memset(_after_gc_usage_array, 0, len); 161 _usage_array_size = num_pools; 162 } 163 164 GCStatInfo::~GCStatInfo() { 165 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); 166 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); 167 } 168 169 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { 170 MemoryUsage* gc_usage_array; 171 if (before_gc) { 172 gc_usage_array = _before_gc_usage_array; 173 } else { 174 gc_usage_array = _after_gc_usage_array; 175 } 176 gc_usage_array[pool_index] = usage; 177 } 178 179 void GCStatInfo::clear() { 180 _index = 0; 181 _start_time = 0L; 182 _end_time = 0L; 183 size_t len = _usage_array_size * sizeof(MemoryUsage); 184 memset(_before_gc_usage_array, 0, len); 185 memset(_after_gc_usage_array, 0, len); 186 } 187 188 189 GCMemoryManager::GCMemoryManager() : MemoryManager() { 190 _num_collections = 0; 191 _last_gc_stat = NULL; 192 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true); 193 _current_gc_stat = NULL; 194 _num_gc_threads = 1; 195 } 196 197 GCMemoryManager::~GCMemoryManager() { 198 delete _last_gc_stat; 199 delete _last_gc_lock; 200 delete _current_gc_stat; 201 } 202 203 void GCMemoryManager::initialize_gc_stat_info() { 204 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); 205 _last_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); 206 _current_gc_stat = new GCStatInfo(MemoryService::num_memory_pools()); 207 // tracking concurrent collections we need two objects: one to update, and one to 208 // hold the publicly available "last (completed) gc" information. 209 } 210 211 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 212 bool recordAccumulatedGCTime) { 213 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); 214 if (recordAccumulatedGCTime) { 215 _accumulated_timer.start(); 216 } 217 // _num_collections now increases in gc_end, to count completed collections 218 if (recordGCBeginTime) { 219 _current_gc_stat->set_index(_num_collections+1); 220 _current_gc_stat->set_start_time(Management::timestamp()); 221 } 222 223 if (recordPreGCUsage) { 224 // Keep memory usage of all memory pools 225 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 226 MemoryPool* pool = MemoryService::get_memory_pool(i); 227 MemoryUsage usage = pool->get_memory_usage(); 228 _current_gc_stat->set_before_gc_usage(i, usage); 229 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin, 230 name(), strlen(name()), 231 pool->name(), strlen(pool->name()), 232 usage.init_size(), usage.used(), 233 usage.committed(), usage.max_size()); 234 } 235 } 236 } 237 238 // A collector MUST, even if it does not complete for some reason, 239 // make a TraceMemoryManagerStats object where countCollection is true, 240 // to ensure the current gc stat is placed in _last_gc_stat. 241 void GCMemoryManager::gc_end(bool recordPostGCUsage, 242 bool recordAccumulatedGCTime, 243 bool recordGCEndTime, bool countCollection) { 244 if (recordAccumulatedGCTime) { 245 _accumulated_timer.stop(); 246 } 247 if (recordGCEndTime) { 248 _current_gc_stat->set_end_time(Management::timestamp()); 249 } 250 251 if (recordPostGCUsage) { 252 int i; 253 // keep the last gc statistics for all memory pools 254 for (i = 0; i < MemoryService::num_memory_pools(); i++) { 255 MemoryPool* pool = MemoryService::get_memory_pool(i); 256 MemoryUsage usage = pool->get_memory_usage(); 257 258 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end, 259 name(), strlen(name()), 260 pool->name(), strlen(pool->name()), 261 usage.init_size(), usage.used(), 262 usage.committed(), usage.max_size()); 263 264 _current_gc_stat->set_after_gc_usage(i, usage); 265 } 266 267 // Set last collection usage of the memory pools managed by this collector 268 for (i = 0; i < num_memory_pools(); i++) { 269 MemoryPool* pool = get_memory_pool(i); 270 MemoryUsage usage = pool->get_memory_usage(); 271 272 // Compare with GC usage threshold 273 pool->set_last_collection_usage(usage); 274 LowMemoryDetector::detect_after_gc_memory(pool); 275 } 276 } 277 if (countCollection) { 278 _num_collections++; 279 // alternately update two objects making one public when complete 280 { 281 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 282 GCStatInfo *tmp = _last_gc_stat; 283 _last_gc_stat = _current_gc_stat; 284 _current_gc_stat = tmp; 285 // reset the current stat for diagnosability purposes 286 _current_gc_stat->clear(); 287 } 288 } 289 } 290 291 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { 292 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 293 if (_last_gc_stat->gc_index() != 0) { 294 dest->set_index(_last_gc_stat->gc_index()); 295 dest->set_start_time(_last_gc_stat->start_time()); 296 dest->set_end_time(_last_gc_stat->end_time()); 297 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), 298 "Must have same array size"); 299 size_t len = dest->usage_array_size() * sizeof(MemoryUsage); 300 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); 301 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); 302 } 303 return _last_gc_stat->gc_index(); 304 } |