1 /* 2 * Copyright (c) 2003, 2017, 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 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) { 95 // Must do an acquire so as to force ordering of subsequent 96 // loads from anything _memory_mgr_obj points to or implies. 97 instanceOop mgr_obj = OrderAccess::load_acquire(&_memory_mgr_obj); 98 if (mgr_obj == NULL) { 99 // It's ok for more than one thread to execute the code up to the locked region. 100 // Extra manager instances will just be gc'ed. 101 Klass* k = Management::sun_management_ManagementFactoryHelper_klass(CHECK_0); 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 Klass* extKlass = Management::com_sun_management_internal_GarbageCollectorExtImpl_klass(CHECK_0); 113 // com.sun.management.GarbageCollectorMXBean is in jdk.management module which may not be present. 114 if (extKlass != NULL) { 115 k = extKlass; 116 } 117 118 method_name = vmSymbols::createGarbageCollector_name(); 119 120 signature = vmSymbols::createGarbageCollector_signature(); 121 args.push_oop(Handle()); // Argument 2 (for future extension) 122 } else { 123 method_name = vmSymbols::createMemoryManager_name(); 124 signature = vmSymbols::createMemoryManager_signature(); 125 } 126 127 InstanceKlass* ik = InstanceKlass::cast(k); 128 129 JavaCalls::call_static(&result, 130 ik, 131 method_name, 132 signature, 133 &args, 134 CHECK_0); 135 136 instanceOop m = (instanceOop) result.get_jobject(); 137 instanceHandle mgr(THREAD, m); 138 139 { 140 // Get lock before setting _memory_mgr_obj 141 // since another thread may have created the instance 142 MutexLocker ml(Management_lock); 143 144 // Check if another thread has created the management object. We reload 145 // _memory_mgr_obj here because some other thread may have initialized 146 // it while we were executing the code before the lock. 147 // 148 // The lock has done an acquire, so the load can't float above it, but 149 // we need to do a load_acquire as above. 150 mgr_obj = OrderAccess::load_acquire(&_memory_mgr_obj); 151 if (mgr_obj != NULL) { 152 return mgr_obj; 153 } 154 155 // Get the address of the object we created via call_special. 156 mgr_obj = mgr(); 157 158 // Use store barrier to make sure the memory accesses associated 159 // with creating the management object are visible before publishing 160 // its address. The unlock will publish the store to _memory_mgr_obj 161 // because it does a release first. 162 OrderAccess::release_store(&_memory_mgr_obj, mgr_obj); 163 } 164 } 165 166 return mgr_obj; 167 } 168 169 void MemoryManager::oops_do(OopClosure* f) { 170 f->do_oop((oop*) &_memory_mgr_obj); 171 } 172 173 GCStatInfo::GCStatInfo(int num_pools) { 174 // initialize the arrays for memory usage 175 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 176 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 177 _usage_array_size = num_pools; 178 clear(); 179 } 180 181 GCStatInfo::~GCStatInfo() { 182 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array); 183 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array); 184 } 185 186 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { 187 MemoryUsage* gc_usage_array; 188 if (before_gc) { 189 gc_usage_array = _before_gc_usage_array; 190 } else { 191 gc_usage_array = _after_gc_usage_array; 192 } 193 gc_usage_array[pool_index] = usage; 194 } 195 196 void GCStatInfo::clear() { 197 _index = 0; 198 _start_time = 0L; 199 _end_time = 0L; 200 size_t len = _usage_array_size * sizeof(MemoryUsage); 201 memset(_before_gc_usage_array, 0, len); 202 memset(_after_gc_usage_array, 0, len); 203 } 204 205 206 GCMemoryManager::GCMemoryManager() : MemoryManager() { 207 _num_collections = 0; 208 _last_gc_stat = NULL; 209 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true, 210 Monitor::_safepoint_check_never); 211 _current_gc_stat = NULL; 212 _num_gc_threads = 1; 213 _notification_enabled = false; 214 } 215 216 GCMemoryManager::~GCMemoryManager() { 217 delete _last_gc_stat; 218 delete _last_gc_lock; 219 delete _current_gc_stat; 220 } 221 222 void GCMemoryManager::initialize_gc_stat_info() { 223 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); 224 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 225 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 226 // tracking concurrent collections we need two objects: one to update, and one to 227 // hold the publicly available "last (completed) gc" information. 228 } 229 230 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 231 bool recordAccumulatedGCTime) { 232 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); 233 if (recordAccumulatedGCTime) { 234 _accumulated_timer.start(); 235 } 236 // _num_collections now increases in gc_end, to count completed collections 237 if (recordGCBeginTime) { 238 _current_gc_stat->set_index(_num_collections+1); 239 _current_gc_stat->set_start_time(Management::timestamp()); 240 } 241 242 if (recordPreGCUsage) { 243 // Keep memory usage of all memory pools 244 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 245 MemoryPool* pool = MemoryService::get_memory_pool(i); 246 MemoryUsage usage = pool->get_memory_usage(); 247 _current_gc_stat->set_before_gc_usage(i, usage); 248 HOTSPOT_MEM_POOL_GC_BEGIN( 249 (char *) name(), strlen(name()), 250 (char *) pool->name(), strlen(pool->name()), 251 usage.init_size(), usage.used(), 252 usage.committed(), usage.max_size()); 253 } 254 } 255 } 256 257 // A collector MUST, even if it does not complete for some reason, 258 // make a TraceMemoryManagerStats object where countCollection is true, 259 // to ensure the current gc stat is placed in _last_gc_stat. 260 void GCMemoryManager::gc_end(bool recordPostGCUsage, 261 bool recordAccumulatedGCTime, 262 bool recordGCEndTime, bool countCollection, 263 GCCause::Cause cause) { 264 if (recordAccumulatedGCTime) { 265 _accumulated_timer.stop(); 266 } 267 if (recordGCEndTime) { 268 _current_gc_stat->set_end_time(Management::timestamp()); 269 } 270 271 if (recordPostGCUsage) { 272 int i; 273 // keep the last gc statistics for all memory pools 274 for (i = 0; i < MemoryService::num_memory_pools(); i++) { 275 MemoryPool* pool = MemoryService::get_memory_pool(i); 276 MemoryUsage usage = pool->get_memory_usage(); 277 278 HOTSPOT_MEM_POOL_GC_END( 279 (char *) name(), strlen(name()), 280 (char *) pool->name(), strlen(pool->name()), 281 usage.init_size(), usage.used(), 282 usage.committed(), usage.max_size()); 283 284 _current_gc_stat->set_after_gc_usage(i, usage); 285 } 286 287 // Set last collection usage of the memory pools managed by this collector 288 for (i = 0; i < num_memory_pools(); i++) { 289 MemoryPool* pool = get_memory_pool(i); 290 MemoryUsage usage = pool->get_memory_usage(); 291 292 // Compare with GC usage threshold 293 pool->set_last_collection_usage(usage); 294 LowMemoryDetector::detect_after_gc_memory(pool); 295 } 296 } 297 298 if (countCollection) { 299 _num_collections++; 300 // alternately update two objects making one public when complete 301 { 302 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 303 GCStatInfo *tmp = _last_gc_stat; 304 _last_gc_stat = _current_gc_stat; 305 _current_gc_stat = tmp; 306 // reset the current stat for diagnosability purposes 307 _current_gc_stat->clear(); 308 } 309 310 if (is_notification_enabled()) { 311 bool isMajorGC = this == MemoryService::get_major_gc_manager(); 312 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC", 313 GCCause::to_string(cause)); 314 } 315 } 316 } 317 318 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { 319 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 320 if (_last_gc_stat->gc_index() != 0) { 321 dest->set_index(_last_gc_stat->gc_index()); 322 dest->set_start_time(_last_gc_stat->start_time()); 323 dest->set_end_time(_last_gc_stat->end_time()); 324 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), 325 "Must have same array size"); 326 size_t len = dest->usage_array_size() * sizeof(MemoryUsage); 327 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); 328 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); 329 } 330 return _last_gc_stat->gc_index(); 331 }