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 #include "precompiled.hpp" 26 #include "classfile/systemDictionary.hpp" 27 #include "classfile/vmSymbols.hpp" 28 #include "oops/oop.inline.hpp" 29 #include "runtime/handles.inline.hpp" 30 #include "runtime/javaCalls.hpp" 31 #include "services/lowMemoryDetector.hpp" 32 #include "services/management.hpp" 33 #include "services/memoryManager.hpp" 34 #include "services/memoryPool.hpp" 35 #include "services/memoryService.hpp" 36 #include "services/gcNotifier.hpp" 37 #include "utilities/dtrace.hpp" 38 39 MemoryManager::MemoryManager() { 40 _num_pools = 0; 41 (void)const_cast<instanceOop&>(_memory_mgr_obj = NULL); 42 } 43 44 void MemoryManager::add_pool(MemoryPool* pool) { 45 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max"); 46 if (_num_pools < MemoryManager::max_num_pools) { 47 _pools[_num_pools] = pool; 48 _num_pools++; 49 } 50 pool->add_manager(this); 51 } 52 53 MemoryManager* MemoryManager::get_code_cache_memory_manager() { 54 return (MemoryManager*) new CodeCacheMemoryManager(); 55 } 56 57 MemoryManager* MemoryManager::get_metaspace_memory_manager() { 58 return (MemoryManager*) new MetaspaceMemoryManager(); 59 } 60 61 GCMemoryManager* MemoryManager::get_copy_memory_manager() { 62 return (GCMemoryManager*) new CopyMemoryManager(); 63 } 64 65 GCMemoryManager* MemoryManager::get_msc_memory_manager() { 66 return (GCMemoryManager*) new MSCMemoryManager(); 67 } 68 69 GCMemoryManager* MemoryManager::get_parnew_memory_manager() { 70 return (GCMemoryManager*) new ParNewMemoryManager(); 71 } 72 73 GCMemoryManager* MemoryManager::get_cms_memory_manager() { 74 return (GCMemoryManager*) new CMSMemoryManager(); 75 } 76 77 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() { 78 return (GCMemoryManager*) new PSScavengeMemoryManager(); 79 } 80 81 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() { 82 return (GCMemoryManager*) new PSMarkSweepMemoryManager(); 83 } 84 85 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() { 86 return (GCMemoryManager*) new G1YoungGenMemoryManager(); 87 } 88 89 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() { 90 return (GCMemoryManager*) new G1OldGenMemoryManager(); 91 } 92 93 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) { 94 // Must do an acquire so as to force ordering of subsequent 95 // loads from anything _memory_mgr_obj points to or implies. 96 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 97 if (mgr_obj == NULL) { 98 // It's ok for more than one thread to execute the code up to the locked region. 99 // Extra manager instances will just be gc'ed. 100 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_0); 101 instanceKlassHandle ik(THREAD, k); 102 103 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0); 104 105 JavaValue result(T_OBJECT); 106 JavaCallArguments args; 107 args.push_oop(mgr_name); // Argument 1 108 109 Symbol* method_name = NULL; 110 Symbol* signature = NULL; 111 if (is_gc_memory_manager()) { 112 method_name = vmSymbols::createGarbageCollector_name(); 113 signature = vmSymbols::createGarbageCollector_signature(); 114 args.push_oop(Handle()); // Argument 2 (for future extension) 115 } else { 116 method_name = vmSymbols::createMemoryManager_name(); 117 signature = vmSymbols::createMemoryManager_signature(); 118 } 119 120 JavaCalls::call_static(&result, 121 ik, 122 method_name, 123 signature, 124 &args, 125 CHECK_0); 126 127 instanceOop m = (instanceOop) result.get_jobject(); 128 instanceHandle mgr(THREAD, m); 129 130 { 131 // Get lock before setting _memory_mgr_obj 132 // since another thread may have created the instance 133 MutexLocker ml(Management_lock); 134 135 // Check if another thread has created the management object. We reload 136 // _memory_mgr_obj here because some other thread may have initialized 137 // it while we were executing the code before the lock. 138 // 139 // The lock has done an acquire, so the load can't float above it, but 140 // we need to do a load_acquire as above. 141 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 142 if (mgr_obj != NULL) { 143 return mgr_obj; 144 } 145 146 // Get the address of the object we created via call_special. 147 mgr_obj = mgr(); 148 149 // Use store barrier to make sure the memory accesses associated 150 // with creating the management object are visible before publishing 151 // its address. The unlock will publish the store to _memory_mgr_obj 152 // because it does a release first. 153 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj); 154 } 155 } 156 157 return mgr_obj; 158 } 159 160 void MemoryManager::oops_do(OopClosure* f) { 161 f->do_oop((oop*) &_memory_mgr_obj); 162 } 163 164 GCStatInfo::GCStatInfo(int num_pools) { 165 // initialize the arrays for memory usage 166 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 167 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 168 _usage_array_size = num_pools; 169 clear(); 170 } 171 172 GCStatInfo::~GCStatInfo() { 173 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array, mtInternal); 174 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array, mtInternal); 175 } 176 177 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { 178 MemoryUsage* gc_usage_array; 179 if (before_gc) { 180 gc_usage_array = _before_gc_usage_array; 181 } else { 182 gc_usage_array = _after_gc_usage_array; 183 } 184 gc_usage_array[pool_index] = usage; 185 } 186 187 void GCStatInfo::clear() { 188 _index = 0; 189 _start_time = 0L; 190 _end_time = 0L; 191 size_t len = _usage_array_size * sizeof(MemoryUsage); 192 memset(_before_gc_usage_array, 0, len); 193 memset(_after_gc_usage_array, 0, len); 194 } 195 196 197 GCMemoryManager::GCMemoryManager() : MemoryManager() { 198 _num_collections = 0; 199 _last_gc_stat = NULL; 200 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true); 201 _current_gc_stat = NULL; 202 _num_gc_threads = 1; 203 _notification_enabled = false; 204 } 205 206 GCMemoryManager::~GCMemoryManager() { 207 delete _last_gc_stat; 208 delete _last_gc_lock; 209 delete _current_gc_stat; 210 } 211 212 void GCMemoryManager::initialize_gc_stat_info() { 213 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); 214 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 215 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 216 // tracking concurrent collections we need two objects: one to update, and one to 217 // hold the publicly available "last (completed) gc" information. 218 } 219 220 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 221 bool recordAccumulatedGCTime) { 222 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); 223 if (recordAccumulatedGCTime) { 224 _accumulated_timer.start(); 225 } 226 // _num_collections now increases in gc_end, to count completed collections 227 if (recordGCBeginTime) { 228 _current_gc_stat->set_index(_num_collections+1); 229 _current_gc_stat->set_start_time(Management::timestamp()); 230 } 231 232 if (recordPreGCUsage) { 233 // Keep memory usage of all memory pools 234 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 235 MemoryPool* pool = MemoryService::get_memory_pool(i); 236 MemoryUsage usage = pool->get_memory_usage(); 237 _current_gc_stat->set_before_gc_usage(i, usage); 238 HOTSPOT_MEM_POOL_GC_BEGIN( 239 (char *) name(), strlen(name()), 240 (char *) pool->name(), strlen(pool->name()), 241 usage.init_size(), usage.used(), 242 usage.committed(), usage.max_size()); 243 } 244 } 245 } 246 247 // A collector MUST, even if it does not complete for some reason, 248 // make a TraceMemoryManagerStats object where countCollection is true, 249 // to ensure the current gc stat is placed in _last_gc_stat. 250 void GCMemoryManager::gc_end(bool recordPostGCUsage, 251 bool recordAccumulatedGCTime, 252 bool recordGCEndTime, bool countCollection, 253 GCCause::Cause cause) { 254 if (recordAccumulatedGCTime) { 255 _accumulated_timer.stop(); 256 } 257 if (recordGCEndTime) { 258 _current_gc_stat->set_end_time(Management::timestamp()); 259 } 260 261 if (recordPostGCUsage) { 262 int i; 263 // keep the last gc statistics for all memory pools 264 for (i = 0; i < MemoryService::num_memory_pools(); i++) { 265 MemoryPool* pool = MemoryService::get_memory_pool(i); 266 MemoryUsage usage = pool->get_memory_usage(); 267 268 HOTSPOT_MEM_POOL_GC_END( 269 (char *) name(), strlen(name()), 270 (char *) pool->name(), strlen(pool->name()), 271 usage.init_size(), usage.used(), 272 usage.committed(), usage.max_size()); 273 274 _current_gc_stat->set_after_gc_usage(i, usage); 275 } 276 277 // Set last collection usage of the memory pools managed by this collector 278 for (i = 0; i < num_memory_pools(); i++) { 279 MemoryPool* pool = get_memory_pool(i); 280 MemoryUsage usage = pool->get_memory_usage(); 281 282 // Compare with GC usage threshold 283 pool->set_last_collection_usage(usage); 284 LowMemoryDetector::detect_after_gc_memory(pool); 285 } 286 } 287 288 if (countCollection) { 289 _num_collections++; 290 // alternately update two objects making one public when complete 291 { 292 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 293 GCStatInfo *tmp = _last_gc_stat; 294 _last_gc_stat = _current_gc_stat; 295 _current_gc_stat = tmp; 296 // reset the current stat for diagnosability purposes 297 _current_gc_stat->clear(); 298 } 299 300 if (is_notification_enabled()) { 301 bool isMajorGC = this == MemoryService::get_major_gc_manager(); 302 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC", 303 GCCause::to_string(cause)); 304 } 305 } 306 } 307 308 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { 309 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 310 if (_last_gc_stat->gc_index() != 0) { 311 dest->set_index(_last_gc_stat->gc_index()); 312 dest->set_start_time(_last_gc_stat->start_time()); 313 dest->set_end_time(_last_gc_stat->end_time()); 314 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), 315 "Must have same array size"); 316 size_t len = dest->usage_array_size() * sizeof(MemoryUsage); 317 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); 318 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); 319 } 320 return _last_gc_stat->gc_index(); 321 }