1 /* 2 * Copyright (c) 2003, 2014, 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 #ifndef USDT2 41 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__begin, char*, int, char*, int, 42 size_t, size_t, size_t, size_t); 43 HS_DTRACE_PROBE_DECL8(hotspot, mem__pool__gc__end, char*, int, char*, int, 44 size_t, size_t, size_t, size_t); 45 #endif /* !USDT2 */ 46 47 MemoryManager::MemoryManager() { 48 _num_pools = 0; 49 (void)const_cast<instanceOop&>(_memory_mgr_obj = instanceOop(NULL)); 50 } 51 52 void MemoryManager::add_pool(MemoryPool* pool) { 53 assert(_num_pools < MemoryManager::max_num_pools, "_num_pools exceeds the max"); 54 if (_num_pools < MemoryManager::max_num_pools) { 55 _pools[_num_pools] = pool; 56 _num_pools++; 57 } 58 pool->add_manager(this); 59 } 60 61 MemoryManager* MemoryManager::get_code_cache_memory_manager() { 62 return (MemoryManager*) new CodeCacheMemoryManager(); 63 } 64 65 MemoryManager* MemoryManager::get_metaspace_memory_manager() { 66 return (MemoryManager*) new MetaspaceMemoryManager(); 67 } 68 69 GCMemoryManager* MemoryManager::get_copy_memory_manager() { 70 return (GCMemoryManager*) new CopyMemoryManager(); 71 } 72 73 GCMemoryManager* MemoryManager::get_msc_memory_manager() { 74 return (GCMemoryManager*) new MSCMemoryManager(); 75 } 76 77 GCMemoryManager* MemoryManager::get_parnew_memory_manager() { 78 return (GCMemoryManager*) new ParNewMemoryManager(); 79 } 80 81 GCMemoryManager* MemoryManager::get_cms_memory_manager() { 82 return (GCMemoryManager*) new CMSMemoryManager(); 83 } 84 85 GCMemoryManager* MemoryManager::get_psScavenge_memory_manager() { 86 return (GCMemoryManager*) new PSScavengeMemoryManager(); 87 } 88 89 GCMemoryManager* MemoryManager::get_psMarkSweep_memory_manager() { 90 return (GCMemoryManager*) new PSMarkSweepMemoryManager(); 91 } 92 93 GCMemoryManager* MemoryManager::get_g1YoungGen_memory_manager() { 94 return (GCMemoryManager*) new G1YoungGenMemoryManager(); 95 } 96 97 GCMemoryManager* MemoryManager::get_g1OldGen_memory_manager() { 98 return (GCMemoryManager*) new G1OldGenMemoryManager(); 99 } 100 101 instanceOop MemoryManager::get_memory_manager_instance(TRAPS) { 102 // Must do an acquire so as to force ordering of subsequent 103 // loads from anything _memory_mgr_obj points to or implies. 104 instanceOop mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 105 if (mgr_obj == NULL) { 106 // It's ok for more than one thread to execute the code up to the locked region. 107 // Extra manager instances will just be gc'ed. 108 Klass* k = Management::sun_management_ManagementFactory_klass(CHECK_0); 109 instanceKlassHandle ik(THREAD, k); 110 111 Handle mgr_name = java_lang_String::create_from_str(name(), CHECK_0); 112 113 JavaValue result(T_OBJECT); 114 JavaCallArguments args; 115 args.push_oop(mgr_name); // Argument 1 116 117 Symbol* method_name = NULL; 118 Symbol* signature = NULL; 119 if (is_gc_memory_manager()) { 120 method_name = vmSymbols::createGarbageCollector_name(); 121 signature = vmSymbols::createGarbageCollector_signature(); 122 args.push_oop(Handle()); // Argument 2 (for future extension) 123 } else { 124 method_name = vmSymbols::createMemoryManager_name(); 125 signature = vmSymbols::createMemoryManager_signature(); 126 } 127 128 JavaCalls::call_static(&result, 129 ik, 130 method_name, 131 signature, 132 &args, 133 CHECK_0); 134 135 instanceOop m = (instanceOop) result.get_jobject(); 136 instanceHandle mgr(THREAD, m); 137 138 { 139 // Get lock before setting _memory_mgr_obj 140 // since another thread may have created the instance 141 MutexLocker ml(Management_lock); 142 143 // Check if another thread has created the management object. We reload 144 // _memory_mgr_obj here because some other thread may have initialized 145 // it while we were executing the code before the lock. 146 // 147 // The lock has done an acquire, so the load can't float above it, but 148 // we need to do a load_acquire as above. 149 mgr_obj = (instanceOop)OrderAccess::load_ptr_acquire(&_memory_mgr_obj); 150 if (mgr_obj != NULL) { 151 return mgr_obj; 152 } 153 154 // Get the address of the object we created via call_special. 155 mgr_obj = mgr(); 156 157 // Use store barrier to make sure the memory accesses associated 158 // with creating the management object are visible before publishing 159 // its address. The unlock will publish the store to _memory_mgr_obj 160 // because it does a release first. 161 OrderAccess::release_store_ptr(&_memory_mgr_obj, mgr_obj); 162 } 163 } 164 165 return mgr_obj; 166 } 167 168 void MemoryManager::oops_do(OopClosure* f) { 169 f->do_oop((oop*) &_memory_mgr_obj); 170 } 171 172 GCStatInfo::GCStatInfo(int num_pools) { 173 // initialize the arrays for memory usage 174 _before_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 175 _after_gc_usage_array = (MemoryUsage*) NEW_C_HEAP_ARRAY(MemoryUsage, num_pools, mtInternal); 176 _usage_array_size = num_pools; 177 clear(); 178 } 179 180 GCStatInfo::~GCStatInfo() { 181 FREE_C_HEAP_ARRAY(MemoryUsage*, _before_gc_usage_array, mtInternal); 182 FREE_C_HEAP_ARRAY(MemoryUsage*, _after_gc_usage_array, mtInternal); 183 } 184 185 void GCStatInfo::set_gc_usage(int pool_index, MemoryUsage usage, bool before_gc) { 186 MemoryUsage* gc_usage_array; 187 if (before_gc) { 188 gc_usage_array = _before_gc_usage_array; 189 } else { 190 gc_usage_array = _after_gc_usage_array; 191 } 192 gc_usage_array[pool_index] = usage; 193 } 194 195 void GCStatInfo::clear() { 196 _index = 0; 197 _start_time = 0L; 198 _end_time = 0L; 199 size_t len = _usage_array_size * sizeof(MemoryUsage); 200 memset(_before_gc_usage_array, 0, len); 201 memset(_after_gc_usage_array, 0, len); 202 } 203 204 205 GCMemoryManager::GCMemoryManager() : MemoryManager() { 206 _num_collections = 0; 207 _last_gc_stat = NULL; 208 _last_gc_lock = new Mutex(Mutex::leaf, "_last_gc_lock", true); 209 _current_gc_stat = NULL; 210 _num_gc_threads = 1; 211 _notification_enabled = false; 212 } 213 214 GCMemoryManager::~GCMemoryManager() { 215 delete _last_gc_stat; 216 delete _last_gc_lock; 217 delete _current_gc_stat; 218 } 219 220 void GCMemoryManager::initialize_gc_stat_info() { 221 assert(MemoryService::num_memory_pools() > 0, "should have one or more memory pools"); 222 _last_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 223 _current_gc_stat = new(ResourceObj::C_HEAP, mtGC) GCStatInfo(MemoryService::num_memory_pools()); 224 // tracking concurrent collections we need two objects: one to update, and one to 225 // hold the publicly available "last (completed) gc" information. 226 } 227 228 void GCMemoryManager::gc_begin(bool recordGCBeginTime, bool recordPreGCUsage, 229 bool recordAccumulatedGCTime) { 230 assert(_last_gc_stat != NULL && _current_gc_stat != NULL, "Just checking"); 231 if (recordAccumulatedGCTime) { 232 _accumulated_timer.start(); 233 } 234 // _num_collections now increases in gc_end, to count completed collections 235 if (recordGCBeginTime) { 236 _current_gc_stat->set_index(_num_collections+1); 237 _current_gc_stat->set_start_time(Management::timestamp()); 238 } 239 240 if (recordPreGCUsage) { 241 // Keep memory usage of all memory pools 242 for (int i = 0; i < MemoryService::num_memory_pools(); i++) { 243 MemoryPool* pool = MemoryService::get_memory_pool(i); 244 MemoryUsage usage = pool->get_memory_usage(); 245 _current_gc_stat->set_before_gc_usage(i, usage); 246 #ifndef USDT2 247 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__begin, 248 name(), strlen(name()), 249 pool->name(), strlen(pool->name()), 250 usage.init_size(), usage.used(), 251 usage.committed(), usage.max_size()); 252 #else /* USDT2 */ 253 HOTSPOT_MEM_POOL_GC_BEGIN( 254 (char *) name(), strlen(name()), 255 (char *) pool->name(), strlen(pool->name()), 256 usage.init_size(), usage.used(), 257 usage.committed(), usage.max_size()); 258 #endif /* USDT2 */ 259 } 260 } 261 } 262 263 // A collector MUST, even if it does not complete for some reason, 264 // make a TraceMemoryManagerStats object where countCollection is true, 265 // to ensure the current gc stat is placed in _last_gc_stat. 266 void GCMemoryManager::gc_end(bool recordPostGCUsage, 267 bool recordAccumulatedGCTime, 268 bool recordGCEndTime, bool countCollection, 269 GCCause::Cause cause) { 270 if (recordAccumulatedGCTime) { 271 _accumulated_timer.stop(); 272 } 273 if (recordGCEndTime) { 274 _current_gc_stat->set_end_time(Management::timestamp()); 275 } 276 277 if (recordPostGCUsage) { 278 int i; 279 // keep the last gc statistics for all memory pools 280 for (i = 0; i < MemoryService::num_memory_pools(); i++) { 281 MemoryPool* pool = MemoryService::get_memory_pool(i); 282 MemoryUsage usage = pool->get_memory_usage(); 283 284 #ifndef USDT2 285 HS_DTRACE_PROBE8(hotspot, mem__pool__gc__end, 286 name(), strlen(name()), 287 pool->name(), strlen(pool->name()), 288 usage.init_size(), usage.used(), 289 usage.committed(), usage.max_size()); 290 #else /* USDT2 */ 291 HOTSPOT_MEM_POOL_GC_END( 292 (char *) name(), strlen(name()), 293 (char *) pool->name(), strlen(pool->name()), 294 usage.init_size(), usage.used(), 295 usage.committed(), usage.max_size()); 296 #endif /* USDT2 */ 297 298 _current_gc_stat->set_after_gc_usage(i, usage); 299 } 300 301 // Set last collection usage of the memory pools managed by this collector 302 for (i = 0; i < num_memory_pools(); i++) { 303 MemoryPool* pool = get_memory_pool(i); 304 MemoryUsage usage = pool->get_memory_usage(); 305 306 // Compare with GC usage threshold 307 pool->set_last_collection_usage(usage); 308 LowMemoryDetector::detect_after_gc_memory(pool); 309 } 310 } 311 312 if (countCollection) { 313 _num_collections++; 314 // alternately update two objects making one public when complete 315 { 316 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 317 GCStatInfo *tmp = _last_gc_stat; 318 _last_gc_stat = _current_gc_stat; 319 _current_gc_stat = tmp; 320 // reset the current stat for diagnosability purposes 321 _current_gc_stat->clear(); 322 } 323 324 if (is_notification_enabled()) { 325 bool isMajorGC = this == MemoryService::get_major_gc_manager(); 326 GCNotifier::pushNotification(this, isMajorGC ? "end of major GC" : "end of minor GC", 327 GCCause::to_string(cause)); 328 } 329 } 330 } 331 332 size_t GCMemoryManager::get_last_gc_stat(GCStatInfo* dest) { 333 MutexLockerEx ml(_last_gc_lock, Mutex::_no_safepoint_check_flag); 334 if (_last_gc_stat->gc_index() != 0) { 335 dest->set_index(_last_gc_stat->gc_index()); 336 dest->set_start_time(_last_gc_stat->start_time()); 337 dest->set_end_time(_last_gc_stat->end_time()); 338 assert(dest->usage_array_size() == _last_gc_stat->usage_array_size(), 339 "Must have same array size"); 340 size_t len = dest->usage_array_size() * sizeof(MemoryUsage); 341 memcpy(dest->before_gc_usage_array(), _last_gc_stat->before_gc_usage_array(), len); 342 memcpy(dest->after_gc_usage_array(), _last_gc_stat->after_gc_usage_array(), len); 343 } 344 return _last_gc_stat->gc_index(); 345 }