1 /* 2 * Copyright (c) 2003, 2012, 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 "gc_implementation/shared/mutableSpace.hpp" 29 #include "memory/collectorPolicy.hpp" 30 #include "memory/defNewGeneration.hpp" 31 #include "memory/genCollectedHeap.hpp" 32 #include "memory/generation.hpp" 33 #include "memory/generationSpec.hpp" 34 #include "memory/heap.hpp" 35 #include "memory/memRegion.hpp" 36 #include "memory/tenuredGeneration.hpp" 37 #include "oops/oop.inline.hpp" 38 #include "runtime/javaCalls.hpp" 39 #include "services/classLoadingService.hpp" 40 #include "services/lowMemoryDetector.hpp" 41 #include "services/management.hpp" 42 #include "services/memoryManager.hpp" 43 #include "services/memoryPool.hpp" 44 #include "services/memoryService.hpp" 45 #include "utilities/growableArray.hpp" 46 #include "utilities/macros.hpp" 47 #if INCLUDE_ALL_GCS 48 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp" 49 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" 50 #include "gc_implementation/parNew/parNewGeneration.hpp" 51 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp" 52 #include "gc_implementation/parallelScavenge/psOldGen.hpp" 53 #include "gc_implementation/parallelScavenge/psYoungGen.hpp" 54 #include "services/g1MemoryPool.hpp" 55 #include "services/psMemoryPool.hpp" 56 #endif // INCLUDE_ALL_GCS 57 58 GrowableArray<MemoryPool*>* MemoryService::_pools_list = 59 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<MemoryPool*>(init_pools_list_size, true); 60 GrowableArray<MemoryManager*>* MemoryService::_managers_list = 61 new (ResourceObj::C_HEAP, mtInternal) GrowableArray<MemoryManager*>(init_managers_list_size, true); 62 63 GCMemoryManager* MemoryService::_minor_gc_manager = NULL; 64 GCMemoryManager* MemoryService::_major_gc_manager = NULL; 65 MemoryPool* MemoryService::_code_heap_pool = NULL; 66 67 class GcThreadCountClosure: public ThreadClosure { 68 private: 69 int _count; 70 public: 71 GcThreadCountClosure() : _count(0) {}; 72 void do_thread(Thread* thread); 73 int count() { return _count; } 74 }; 75 76 void GcThreadCountClosure::do_thread(Thread* thread) { 77 _count++; 78 } 79 80 void MemoryService::set_universe_heap(CollectedHeap* heap) { 81 CollectedHeap::Name kind = heap->kind(); 82 switch (kind) { 83 case CollectedHeap::GenCollectedHeap : { 84 add_gen_collected_heap_info(GenCollectedHeap::heap()); 85 break; 86 } 87 #if INCLUDE_ALL_GCS 88 case CollectedHeap::ParallelScavengeHeap : { 89 add_parallel_scavenge_heap_info(ParallelScavengeHeap::heap()); 90 break; 91 } 92 case CollectedHeap::G1CollectedHeap : { 93 add_g1_heap_info(G1CollectedHeap::heap()); 94 break; 95 } 96 #endif // INCLUDE_ALL_GCS 97 default: { 98 guarantee(false, "Unrecognized kind of heap"); 99 } 100 } 101 102 // set the GC thread count 103 GcThreadCountClosure gctcc; 104 heap->gc_threads_do(&gctcc); 105 int count = gctcc.count(); 106 if (count > 0) { 107 _minor_gc_manager->set_num_gc_threads(count); 108 _major_gc_manager->set_num_gc_threads(count); 109 } 110 111 // All memory pools and memory managers are initialized. 112 // 113 _minor_gc_manager->initialize_gc_stat_info(); 114 _major_gc_manager->initialize_gc_stat_info(); 115 } 116 117 // Add memory pools for GenCollectedHeap 118 // This function currently only supports two generations collected heap. 119 // The collector for GenCollectedHeap will have two memory managers. 120 void MemoryService::add_gen_collected_heap_info(GenCollectedHeap* heap) { 121 CollectorPolicy* policy = heap->collector_policy(); 122 123 assert(policy->is_two_generation_policy(), "Only support two generations"); 124 guarantee(heap->n_gens() == 2, "Only support two-generation heap"); 125 126 TwoGenerationCollectorPolicy* two_gen_policy = policy->as_two_generation_policy(); 127 if (two_gen_policy != NULL) { 128 GenerationSpec** specs = two_gen_policy->generations(); 129 Generation::Name kind = specs[0]->name(); 130 switch (kind) { 131 case Generation::DefNew: 132 _minor_gc_manager = MemoryManager::get_copy_memory_manager(); 133 break; 134 #if INCLUDE_ALL_GCS 135 case Generation::ParNew: 136 case Generation::ASParNew: 137 _minor_gc_manager = MemoryManager::get_parnew_memory_manager(); 138 break; 139 #endif // INCLUDE_ALL_GCS 140 default: 141 guarantee(false, "Unrecognized generation spec"); 142 break; 143 } 144 if (policy->is_mark_sweep_policy()) { 145 _major_gc_manager = MemoryManager::get_msc_memory_manager(); 146 #if INCLUDE_ALL_GCS 147 } else if (policy->is_concurrent_mark_sweep_policy()) { 148 _major_gc_manager = MemoryManager::get_cms_memory_manager(); 149 #endif // INCLUDE_ALL_GCS 150 } else { 151 guarantee(false, "Unknown two-gen policy"); 152 } 153 } else { 154 guarantee(false, "Non two-gen policy"); 155 } 156 _managers_list->append(_minor_gc_manager); 157 _managers_list->append(_major_gc_manager); 158 159 add_generation_memory_pool(heap->get_gen(minor), _major_gc_manager, _minor_gc_manager); 160 add_generation_memory_pool(heap->get_gen(major), _major_gc_manager); 161 } 162 163 #if INCLUDE_ALL_GCS 164 // Add memory pools for ParallelScavengeHeap 165 // This function currently only supports two generations collected heap. 166 // The collector for ParallelScavengeHeap will have two memory managers. 167 void MemoryService::add_parallel_scavenge_heap_info(ParallelScavengeHeap* heap) { 168 // Two managers to keep statistics about _minor_gc_manager and _major_gc_manager GC. 169 _minor_gc_manager = MemoryManager::get_psScavenge_memory_manager(); 170 _major_gc_manager = MemoryManager::get_psMarkSweep_memory_manager(); 171 _managers_list->append(_minor_gc_manager); 172 _managers_list->append(_major_gc_manager); 173 174 add_psYoung_memory_pool(heap->young_gen(), _major_gc_manager, _minor_gc_manager); 175 add_psOld_memory_pool(heap->old_gen(), _major_gc_manager); 176 } 177 178 void MemoryService::add_g1_heap_info(G1CollectedHeap* g1h) { 179 assert(UseG1GC, "sanity"); 180 181 _minor_gc_manager = MemoryManager::get_g1YoungGen_memory_manager(); 182 _major_gc_manager = MemoryManager::get_g1OldGen_memory_manager(); 183 _managers_list->append(_minor_gc_manager); 184 _managers_list->append(_major_gc_manager); 185 186 add_g1YoungGen_memory_pool(g1h, _major_gc_manager, _minor_gc_manager); 187 add_g1OldGen_memory_pool(g1h, _major_gc_manager); 188 } 189 #endif // INCLUDE_ALL_GCS 190 191 MemoryPool* MemoryService::add_gen(Generation* gen, 192 const char* name, 193 bool is_heap, 194 bool support_usage_threshold) { 195 196 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 197 GenerationPool* pool = new GenerationPool(gen, name, type, support_usage_threshold); 198 _pools_list->append(pool); 199 return (MemoryPool*) pool; 200 } 201 202 MemoryPool* MemoryService::add_space(ContiguousSpace* space, 203 const char* name, 204 bool is_heap, 205 size_t max_size, 206 bool support_usage_threshold) { 207 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 208 ContiguousSpacePool* pool = new ContiguousSpacePool(space, name, type, max_size, support_usage_threshold); 209 210 _pools_list->append(pool); 211 return (MemoryPool*) pool; 212 } 213 214 MemoryPool* MemoryService::add_survivor_spaces(DefNewGeneration* gen, 215 const char* name, 216 bool is_heap, 217 size_t max_size, 218 bool support_usage_threshold) { 219 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 220 SurvivorContiguousSpacePool* pool = new SurvivorContiguousSpacePool(gen, name, type, max_size, support_usage_threshold); 221 222 _pools_list->append(pool); 223 return (MemoryPool*) pool; 224 } 225 226 #if INCLUDE_ALL_GCS 227 MemoryPool* MemoryService::add_cms_space(CompactibleFreeListSpace* space, 228 const char* name, 229 bool is_heap, 230 size_t max_size, 231 bool support_usage_threshold) { 232 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 233 CompactibleFreeListSpacePool* pool = new CompactibleFreeListSpacePool(space, name, type, max_size, support_usage_threshold); 234 _pools_list->append(pool); 235 return (MemoryPool*) pool; 236 } 237 #endif // INCLUDE_ALL_GCS 238 239 // Add memory pool(s) for one generation 240 void MemoryService::add_generation_memory_pool(Generation* gen, 241 MemoryManager* major_mgr, 242 MemoryManager* minor_mgr) { 243 Generation::Name kind = gen->kind(); 244 int index = _pools_list->length(); 245 246 switch (kind) { 247 case Generation::DefNew: { 248 assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers"); 249 DefNewGeneration* young_gen = (DefNewGeneration*) gen; 250 // Add a memory pool for each space and young gen doesn't 251 // support low memory detection as it is expected to get filled up. 252 MemoryPool* eden = add_space(young_gen->eden(), 253 "Eden Space", 254 true, /* is_heap */ 255 young_gen->max_eden_size(), 256 false /* support_usage_threshold */); 257 MemoryPool* survivor = add_survivor_spaces(young_gen, 258 "Survivor Space", 259 true, /* is_heap */ 260 young_gen->max_survivor_size(), 261 false /* support_usage_threshold */); 262 break; 263 } 264 265 #if INCLUDE_ALL_GCS 266 case Generation::ParNew: 267 case Generation::ASParNew: 268 { 269 assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers"); 270 // Add a memory pool for each space and young gen doesn't 271 // support low memory detection as it is expected to get filled up. 272 ParNewGeneration* parnew_gen = (ParNewGeneration*) gen; 273 MemoryPool* eden = add_space(parnew_gen->eden(), 274 "Par Eden Space", 275 true /* is_heap */, 276 parnew_gen->max_eden_size(), 277 false /* support_usage_threshold */); 278 MemoryPool* survivor = add_survivor_spaces(parnew_gen, 279 "Par Survivor Space", 280 true, /* is_heap */ 281 parnew_gen->max_survivor_size(), 282 false /* support_usage_threshold */); 283 284 break; 285 } 286 #endif // INCLUDE_ALL_GCS 287 288 case Generation::MarkSweepCompact: { 289 assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager"); 290 add_gen(gen, 291 "Tenured Gen", 292 true, /* is_heap */ 293 true /* support_usage_threshold */); 294 break; 295 } 296 297 #if INCLUDE_ALL_GCS 298 case Generation::ConcurrentMarkSweep: 299 case Generation::ASConcurrentMarkSweep: 300 { 301 assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager"); 302 ConcurrentMarkSweepGeneration* cms = (ConcurrentMarkSweepGeneration*) gen; 303 MemoryPool* pool = add_cms_space(cms->cmsSpace(), 304 "CMS Old Gen", 305 true, /* is_heap */ 306 cms->reserved().byte_size(), 307 true /* support_usage_threshold */); 308 break; 309 } 310 #endif // INCLUDE_ALL_GCS 311 312 default: 313 assert(false, "should not reach here"); 314 // no memory pool added for others 315 break; 316 } 317 318 assert(major_mgr != NULL, "Should have at least one manager"); 319 // Link managers and the memory pools together 320 for (int i = index; i < _pools_list->length(); i++) { 321 MemoryPool* pool = _pools_list->at(i); 322 major_mgr->add_pool(pool); 323 if (minor_mgr != NULL) { 324 minor_mgr->add_pool(pool); 325 } 326 } 327 } 328 329 330 #if INCLUDE_ALL_GCS 331 void MemoryService::add_psYoung_memory_pool(PSYoungGen* gen, MemoryManager* major_mgr, MemoryManager* minor_mgr) { 332 assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers"); 333 334 // Add a memory pool for each space and young gen doesn't 335 // support low memory detection as it is expected to get filled up. 336 EdenMutableSpacePool* eden = new EdenMutableSpacePool(gen, 337 gen->eden_space(), 338 "PS Eden Space", 339 MemoryPool::Heap, 340 false /* support_usage_threshold */); 341 342 SurvivorMutableSpacePool* survivor = new SurvivorMutableSpacePool(gen, 343 "PS Survivor Space", 344 MemoryPool::Heap, 345 false /* support_usage_threshold */); 346 347 major_mgr->add_pool(eden); 348 major_mgr->add_pool(survivor); 349 minor_mgr->add_pool(eden); 350 minor_mgr->add_pool(survivor); 351 _pools_list->append(eden); 352 _pools_list->append(survivor); 353 } 354 355 void MemoryService::add_psOld_memory_pool(PSOldGen* gen, MemoryManager* mgr) { 356 PSGenerationPool* old_gen = new PSGenerationPool(gen, 357 "PS Old Gen", 358 MemoryPool::Heap, 359 true /* support_usage_threshold */); 360 mgr->add_pool(old_gen); 361 _pools_list->append(old_gen); 362 } 363 364 void MemoryService::add_g1YoungGen_memory_pool(G1CollectedHeap* g1h, 365 MemoryManager* major_mgr, 366 MemoryManager* minor_mgr) { 367 assert(major_mgr != NULL && minor_mgr != NULL, "should have two managers"); 368 369 G1EdenPool* eden = new G1EdenPool(g1h); 370 G1SurvivorPool* survivor = new G1SurvivorPool(g1h); 371 372 major_mgr->add_pool(eden); 373 major_mgr->add_pool(survivor); 374 minor_mgr->add_pool(eden); 375 minor_mgr->add_pool(survivor); 376 _pools_list->append(eden); 377 _pools_list->append(survivor); 378 } 379 380 void MemoryService::add_g1OldGen_memory_pool(G1CollectedHeap* g1h, 381 MemoryManager* mgr) { 382 assert(mgr != NULL, "should have one manager"); 383 384 G1OldGenPool* old_gen = new G1OldGenPool(g1h); 385 mgr->add_pool(old_gen); 386 _pools_list->append(old_gen); 387 } 388 #endif // INCLUDE_ALL_GCS 389 390 void MemoryService::add_code_heap_memory_pool(CodeHeap* heap) { 391 _code_heap_pool = new CodeHeapPool(heap, 392 "Code Cache", 393 true /* support_usage_threshold */); 394 MemoryManager* mgr = MemoryManager::get_code_cache_memory_manager(); 395 mgr->add_pool(_code_heap_pool); 396 397 _pools_list->append(_code_heap_pool); 398 _managers_list->append(mgr); 399 } 400 401 MemoryManager* MemoryService::get_memory_manager(instanceHandle mh) { 402 for (int i = 0; i < _managers_list->length(); i++) { 403 MemoryManager* mgr = _managers_list->at(i); 404 if (mgr->is_manager(mh)) { 405 return mgr; 406 } 407 } 408 return NULL; 409 } 410 411 MemoryPool* MemoryService::get_memory_pool(instanceHandle ph) { 412 for (int i = 0; i < _pools_list->length(); i++) { 413 MemoryPool* pool = _pools_list->at(i); 414 if (pool->is_pool(ph)) { 415 return pool; 416 } 417 } 418 return NULL; 419 } 420 421 void MemoryService::track_memory_usage() { 422 // Track the peak memory usage 423 for (int i = 0; i < _pools_list->length(); i++) { 424 MemoryPool* pool = _pools_list->at(i); 425 pool->record_peak_memory_usage(); 426 } 427 428 // Detect low memory 429 LowMemoryDetector::detect_low_memory(); 430 } 431 432 void MemoryService::track_memory_pool_usage(MemoryPool* pool) { 433 // Track the peak memory usage 434 pool->record_peak_memory_usage(); 435 436 // Detect low memory 437 if (LowMemoryDetector::is_enabled(pool)) { 438 LowMemoryDetector::detect_low_memory(pool); 439 } 440 } 441 442 void MemoryService::gc_begin(bool fullGC, bool recordGCBeginTime, 443 bool recordAccumulatedGCTime, 444 bool recordPreGCUsage, bool recordPeakUsage) { 445 446 GCMemoryManager* mgr; 447 if (fullGC) { 448 mgr = _major_gc_manager; 449 } else { 450 mgr = _minor_gc_manager; 451 } 452 assert(mgr->is_gc_memory_manager(), "Sanity check"); 453 mgr->gc_begin(recordGCBeginTime, recordPreGCUsage, recordAccumulatedGCTime); 454 455 // Track the peak memory usage when GC begins 456 if (recordPeakUsage) { 457 for (int i = 0; i < _pools_list->length(); i++) { 458 MemoryPool* pool = _pools_list->at(i); 459 pool->record_peak_memory_usage(); 460 } 461 } 462 } 463 464 void MemoryService::gc_end(bool fullGC, bool recordPostGCUsage, 465 bool recordAccumulatedGCTime, 466 bool recordGCEndTime, bool countCollection, 467 GCCause::Cause cause) { 468 469 GCMemoryManager* mgr; 470 if (fullGC) { 471 mgr = (GCMemoryManager*) _major_gc_manager; 472 } else { 473 mgr = (GCMemoryManager*) _minor_gc_manager; 474 } 475 assert(mgr->is_gc_memory_manager(), "Sanity check"); 476 477 // register the GC end statistics and memory usage 478 mgr->gc_end(recordPostGCUsage, recordAccumulatedGCTime, recordGCEndTime, 479 countCollection, cause); 480 } 481 482 void MemoryService::oops_do(OopClosure* f) { 483 int i; 484 485 for (i = 0; i < _pools_list->length(); i++) { 486 MemoryPool* pool = _pools_list->at(i); 487 pool->oops_do(f); 488 } 489 for (i = 0; i < _managers_list->length(); i++) { 490 MemoryManager* mgr = _managers_list->at(i); 491 mgr->oops_do(f); 492 } 493 } 494 495 bool MemoryService::set_verbose(bool verbose) { 496 MutexLocker m(Management_lock); 497 // verbose will be set to the previous value 498 bool succeed = CommandLineFlags::boolAtPut((char*)"PrintGC", &verbose, MANAGEMENT); 499 assert(succeed, "Setting PrintGC flag fails"); 500 ClassLoadingService::reset_trace_class_unloading(); 501 502 return verbose; 503 } 504 505 Handle MemoryService::create_MemoryUsage_obj(MemoryUsage usage, TRAPS) { 506 Klass* k = Management::java_lang_management_MemoryUsage_klass(CHECK_NH); 507 instanceKlassHandle ik(THREAD, k); 508 509 instanceHandle obj = ik->allocate_instance_handle(CHECK_NH); 510 511 JavaValue result(T_VOID); 512 JavaCallArguments args(10); 513 args.push_oop(obj); // receiver 514 args.push_long(usage.init_size_as_jlong()); // Argument 1 515 args.push_long(usage.used_as_jlong()); // Argument 2 516 args.push_long(usage.committed_as_jlong()); // Argument 3 517 args.push_long(usage.max_size_as_jlong()); // Argument 4 518 519 JavaCalls::call_special(&result, 520 ik, 521 vmSymbols::object_initializer_name(), 522 vmSymbols::long_long_long_long_void_signature(), 523 &args, 524 CHECK_NH); 525 return obj; 526 } 527 // 528 // GC manager type depends on the type of Generation. Depending on the space 529 // availablity and vm options the gc uses major gc manager or minor gc 530 // manager or both. The type of gc manager depends on the generation kind. 531 // For DefNew, ParNew and ASParNew generation doing scavenge gc uses minor 532 // gc manager (so _fullGC is set to false ) and for other generation kinds 533 // doing mark-sweep-compact uses major gc manager (so _fullGC is set 534 // to true). 535 TraceMemoryManagerStats::TraceMemoryManagerStats(Generation::Name kind, GCCause::Cause cause) { 536 switch (kind) { 537 case Generation::DefNew: 538 #if INCLUDE_ALL_GCS 539 case Generation::ParNew: 540 case Generation::ASParNew: 541 #endif // INCLUDE_ALL_GCS 542 _fullGC=false; 543 break; 544 case Generation::MarkSweepCompact: 545 #if INCLUDE_ALL_GCS 546 case Generation::ConcurrentMarkSweep: 547 case Generation::ASConcurrentMarkSweep: 548 #endif // INCLUDE_ALL_GCS 549 _fullGC=true; 550 break; 551 default: 552 assert(false, "Unrecognized gc generation kind."); 553 } 554 // this has to be called in a stop the world pause and represent 555 // an entire gc pause, start to finish: 556 initialize(_fullGC, cause,true, true, true, true, true, true, true); 557 } 558 TraceMemoryManagerStats::TraceMemoryManagerStats(bool fullGC, 559 GCCause::Cause cause, 560 bool recordGCBeginTime, 561 bool recordPreGCUsage, 562 bool recordPeakUsage, 563 bool recordPostGCUsage, 564 bool recordAccumulatedGCTime, 565 bool recordGCEndTime, 566 bool countCollection) { 567 initialize(fullGC, cause, recordGCBeginTime, recordPreGCUsage, recordPeakUsage, 568 recordPostGCUsage, recordAccumulatedGCTime, recordGCEndTime, 569 countCollection); 570 } 571 572 // for a subclass to create then initialize an instance before invoking 573 // the MemoryService 574 void TraceMemoryManagerStats::initialize(bool fullGC, 575 GCCause::Cause cause, 576 bool recordGCBeginTime, 577 bool recordPreGCUsage, 578 bool recordPeakUsage, 579 bool recordPostGCUsage, 580 bool recordAccumulatedGCTime, 581 bool recordGCEndTime, 582 bool countCollection) { 583 _fullGC = fullGC; 584 _recordGCBeginTime = recordGCBeginTime; 585 _recordPreGCUsage = recordPreGCUsage; 586 _recordPeakUsage = recordPeakUsage; 587 _recordPostGCUsage = recordPostGCUsage; 588 _recordAccumulatedGCTime = recordAccumulatedGCTime; 589 _recordGCEndTime = recordGCEndTime; 590 _countCollection = countCollection; 591 _cause = cause; 592 593 MemoryService::gc_begin(_fullGC, _recordGCBeginTime, _recordAccumulatedGCTime, 594 _recordPreGCUsage, _recordPeakUsage); 595 } 596 597 TraceMemoryManagerStats::~TraceMemoryManagerStats() { 598 MemoryService::gc_end(_fullGC, _recordPostGCUsage, _recordAccumulatedGCTime, 599 _recordGCEndTime, _countCollection, _cause); 600 } 601