1 /* 2 * Copyright (c) 2003, 2015, 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 "runtime/orderAccess.inline.hpp" 32 #include "services/lowMemoryDetector.hpp" 33 #include "services/management.hpp" 34 #include "services/memoryManager.hpp" 35 #include "services/memoryPool.hpp" 36 #include "services/memoryService.hpp" 37 #include "services/gcNotifier.hpp" 38 #include "utilities/dtrace.hpp" 39 40 MemoryManager::MemoryManager() { 41 _num_pools = 0; 42 (void)const_cast<instanceOop&>(_memory_mgr_obj = instanceOop(NULL)); 43 } 44 45 void MemoryManager::add_pool(MemoryPool* pool) { 46 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max"); 47 if (_num_pools < MemoryManager::max_num_pools) { 48 _pools[_num_pools] = pool; 49 _num_pools++; 50 } 51 pool->add_manager(this); 52 } 53 54 MemoryManager* MemoryManager::get_code_cache_memory_manager() { 55 return (MemoryManager*) new CodeCacheMemoryManager(); 56 } 57 58 MemoryManager* MemoryManager::get_metaspace_memory_manager() { 59 return (MemoryManager*) new MetaspaceMemoryManager(); 60 } 61 62 GCMemoryManager* MemoryManager::get_copy_memory_manager() { 63 return (GCMemoryManager*) new CopyMemoryManager(); 64 } 65 66 GCMemoryManager* MemoryManager::get_msc_memory_manager() { 67 return (GCMemoryManager*) new MSCMemoryManager(); 68 } 69 70 GCMemoryManager* MemoryManager::get_parnew_memory_manager() { 71 return (GCMemoryManager*) new ParNewMemoryManager(); 72 } 73 74 GCMemoryManager* MemoryManager::get_cms_memory_manager() { 75 return (GCMemoryManager*) new CMSMemoryManager(); 76 } 77 78 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() { 79 return (GCMemoryManager*) new PSScavengeMemoryManager(); 80 } 81 82 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() { 83 return (GCMemoryManager*) new PSMarkSweepMemoryManager(); 84 } 85 86 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() { 87 return (GCMemoryManager*) new G1YoungGenMemoryManager(); 88 } 89 90 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() { 91 return (GCMemoryManager*) new G1OldGenMemoryManager(); 92 } 93 94 GCMemoryManager* MemoryManager::get_epsilon_memory_manager() { 95 return (GCMemoryManager*) new EpsilonMemoryManager(); 96 } 97 98 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) { 99 // Must do an acquire so as to force ordering of subsequent 100 // loads from anything _memory_mgr_obj points to or implies. 101 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 102 if (mgr_obj == NULL) { 103 // It's ok for more than one thread to execute the code up to the locked region. 104 // Extra manager instances will just be gc'ed. 105 Klass* k = Management::sun_management_ManagementFactoryHelper_klass(CHECK_0); 106 107 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0); 108 109 JavaValue result(T_OBJECT); 110 JavaCallArguments args; 111 args.push_oop(mgr_name); // Argument 1 112 113 Symbol* method_name = NULL; 114 Symbol* signature = NULL; 115 if (is_gc_memory_manager()) { 116 Klass* extKlass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK_0); 117 // com.sun.management.GarbageCollectorMXBean is in jdk.management module which may not be present. 118 if (extKlass != NULL) { 119 k = extKlass; 120 } 121 122 method_name = vmSymbols::createGarbageCollector_name(); 123 124 signature = vmSymbols::createGarbageCollector_signature(); 125 args.push_oop(Handle()); // Argument 2 (for future extension) 126 } else { 127 method_name = vmSymbols::createMemoryManager_name(); 128 signature = vmSymbols::createMemoryManager_signature(); 129 } 130 131 instanceKlassHandle ik(THREAD, k); 132 133 JavaCalls::call_static(&result, 134 ik, 135 method_name, 136 signature, 137 &args, 138 CHECK_0); 139 140 instanceOop m = (instanceOop) result.get_jobject(); 141 instanceHandle mgr(THREAD, m); 142 143 { 144 // Get lock before setting _memory_mgr_obj 145 // since another thread may have created the instance 146 MutexLocker ml(Management_lock); 147 148 // Check if another thread has created the management object. We reload 149 // _memory_mgr_obj here because some other thread may have initialized 150 // it while we were executing the code before the lock. 151 // 152 // The lock has done an acquire, so the load can't float above it, but 153 // we need to do a load_acquire as above. 154 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 155 if (mgr_obj != NULL) { 156 return mgr_obj; 157 } 158 159 // Get the address of the object we created via call_special. 160 mgr_obj = mgr(); 161 162 // Use store barrier to make sure the memory accesses associated 163 // with creating the management object are visible before publishing 164 // its address. The unlock will publish the store to _memory_mgr_obj 165 // because it does a release first. 166 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj); 167 } 168 } 169 170 return mgr_obj; 171 } 172 173 void MemoryManager::oops_do(OopClosure* f) { 174 f->do_oop((oop*) &_memory_mgr_obj); 175 } 176 177 GCStatInfo::GCStatInfo(int num_pools) { 178 // initialize the arrays for memory usage 179 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 180 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 181 _usage_array_size = num_pools; 182 clear(); 183 } 184 185 GCStatInfo::~GCStatInfo() { 186 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); 187 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); 188 } 189 190 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { 191 MemoryUsage* gc_usage_array; 192 if (before_gc) { 193 gc_usage_array = _before_gc_usage_array; 194 } else { 195 gc_usage_array = _after_gc_usage_array; 196 } 197 gc_usage_array[pool_index] = usage; 198 } 199 200 void GCStatInfo::clear() { 201 _index = 0; 202 _start_time = 0L; 203 _end_time = 0L; 204 size_t len = _usage_array_size * sizeof(MemoryUsage); 205 memset(_before_gc_usage_array, 0, len); 206 memset(_after_gc_usage_array, 0, len); 207 } 208 209 210 GCMemoryManager::GCMemoryManager() : MemoryManager() { 211 _num_collections = 0; 212 _last_gc_stat = NULL; 213 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true, 214 Monitor::_safepoint_check_never); 215 _current_gc_stat = NULL; 216 _num_gc_threads = 1; 217 _notification_enabled = false; 218 } 219 220 GCMemoryManager::~GCMemoryManager() { 221 delete _last_gc_stat; 222 delete _last_gc_lock; 223 delete _current_gc_stat; 224 } 225 226 void GCMemoryManager::initialize_gc_stat_info() { 227 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); 228 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 229 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 230 // tracking concurrent collections we need two objects: one to update, and one to 231 // hold the publicly available "last (completed) gc" information. 232 } 233 234 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 235 bool recordAccumulatedGCTime) { 236 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); 237 if (recordAccumulatedGCTime) { 238 _accumulated_timer.start(); 239 } 240 // _num_collections now increases in gc_end, to count completed collections 241 if (recordGCBeginTime) { 242 _current_gc_stat->set_index(_num_collections+1); 243 _current_gc_stat->set_start_time(Management::timestamp()); 244 } 245 246 if (recordPreGCUsage) { 247 // Keep memory usage of all memory pools 248 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 249 MemoryPool* pool = MemoryService::get_memory_pool(i); 250 MemoryUsage usage = pool->get_memory_usage(); 251 _current_gc_stat->set_before_gc_usage(i, usage); 252 HOTSPOT_MEM_POOL_GC_BEGIN( 253 (char *) name(), strlen(name()), 254 (char *) pool->name(), strlen(pool->name()), 255 usage.init_size(), usage.used(), 256 usage.committed(), usage.max_size()); 257 } 258 } 259 } 260 261 // A collector MUST, even if it does not complete for some reason, 262 // make a TraceMemoryManagerStats object where countCollection is true, 263 // to ensure the current gc stat is placed in _last_gc_stat. 264 void GCMemoryManager::gc_end(bool recordPostGCUsage, 265 bool recordAccumulatedGCTime, 266 bool recordGCEndTime, bool countCollection, 267 GCCause::Cause cause) { 268 if (recordAccumulatedGCTime) { 269 _accumulated_timer.stop(); 270 } 271 if (recordGCEndTime) { 272 _current_gc_stat->set_end_time(Management::timestamp()); 273 } 274 275 if (recordPostGCUsage) { 276 int i; 277 // keep the last gc statistics for all memory pools 278 for (i = 0; i < MemoryService::num_memory_pools(); i++) { 279 MemoryPool* pool = MemoryService::get_memory_pool(i); 280 MemoryUsage usage = pool->get_memory_usage(); 281 282 HOTSPOT_MEM_POOL_GC_END( 283 (char *) name(), strlen(name()), 284 (char *) pool->name(), strlen(pool->name()), 285 usage.init_size(), usage.used(), 286 usage.committed(), usage.max_size()); 287 288 _current_gc_stat->set_after_gc_usage(i, usage); 289 } 290 291 // Set last collection usage of the memory pools managed by this collector 292 for (i = 0; i < num_memory_pools(); i++) { 293 MemoryPool* pool = get_memory_pool(i); 294 MemoryUsage usage = pool->get_memory_usage(); 295 296 // Compare with GC usage threshold 297 pool->set_last_collection_usage(usage); 298 LowMemoryDetector::detect_after_gc_memory(pool); 299 } 300 } 301 302 if (countCollection) { 303 _num_collections++; 304 // alternately update two objects making one public when complete 305 { 306 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 307 GCStatInfo *tmp = _last_gc_stat; 308 _last_gc_stat = _current_gc_stat; 309 _current_gc_stat = tmp; 310 // reset the current stat for diagnosability purposes 311 _current_gc_stat->clear(); 312 } 313 314 if (is_notification_enabled()) { 315 bool isMajorGC = this == MemoryService::get_major_gc_manager(); 316 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC", 317 GCCause::to_string(cause)); 318 } 319 } 320 } 321 322 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { 323 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 324 if (_last_gc_stat->gc_index() != 0) { 325 dest->set_index(_last_gc_stat->gc_index()); 326 dest->set_start_time(_last_gc_stat->start_time()); 327 dest->set_end_time(_last_gc_stat->end_time()); 328 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), 329 "Must have same array size"); 330 size_t len = dest->usage_array_size() * sizeof(MemoryUsage); 331 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); 332 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); 333 } 334 return _last_gc_stat->gc_index(); 335 }