1 /* 2 * Copyright (c) 2003, 2006, 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 "incls/_precompiled.incl" 26 # include "incls/_memoryService.cpp.incl" 27 28 GrowableArray<MemoryPool*>* MemoryService::_pools_list = 29 new (ResourceObj::C_HEAP) GrowableArray<MemoryPool*>(init_pools_list_size, true); 30 GrowableArray<MemoryManager*>* MemoryService::_managers_list = 31 new (ResourceObj::C_HEAP) GrowableArray<MemoryManager*>(init_managers_list_size, true); 32 33 GCMemoryManager* MemoryService::_minor_gc_manager = NULL; 34 GCMemoryManager* MemoryService::_major_gc_manager = NULL; 35 MemoryPool* MemoryService::_code_heap_pool = NULL; 36 37 class GcThreadCountClosure: public ThreadClosure { 38 private: 39 int _count; 40 public: 41 GcThreadCountClosure() : _count(0) {}; 42 void do_thread(Thread* thread); 43 int count() { return _count; } 44 }; 45 46 void GcThreadCountClosure::do_thread(Thread* thread) { 47 _count++; 48 } 49 50 void MemoryService::set_universe_heap(CollectedHeap* heap) { 51 CollectedHeap::Name kind = heap->kind(); 52 switch (kind) { 53 case CollectedHeap::GenCollectedHeap : { 54 add_gen_collected_heap_info(GenCollectedHeap::heap()); 55 break; 56 } 57 #ifndef SERIALGC 58 case CollectedHeap::ParallelScavengeHeap : { 59 add_parallel_scavenge_heap_info(ParallelScavengeHeap::heap()); 60 break; 61 } 62 case CollectedHeap::G1CollectedHeap : { 63 add_g1_heap_info(G1CollectedHeap::heap()); 64 break; 65 } 66 #endif // SERIALGC 67 default: { 68 guarantee(false, "Unrecognized kind of heap"); 69 } 70 } 71 72 // set the GC thread count 73 GcThreadCountClosure gctcc; 74 heap->gc_threads_do(&gctcc); 75 int count = gctcc.count(); 76 if (count > 0) { 77 _minor_gc_manager->set_num_gc_threads(count); 78 _major_gc_manager->set_num_gc_threads(count); 79 } 80 81 // All memory pools and memory managers are initialized. 82 // 83 _minor_gc_manager->initialize_gc_stat_info(); 84 _major_gc_manager->initialize_gc_stat_info(); 85 } 86 87 // Add memory pools for GenCollectedHeap 88 // This function currently only supports two generations collected heap. 89 // The collector for GenCollectedHeap will have two memory managers. 90 void MemoryService::add_gen_collected_heap_info(GenCollectedHeap* heap) { 91 CollectorPolicy* policy = heap->collector_policy(); 92 93 assert(policy->is_two_generation_policy(), "Only support two generations"); 94 guarantee(heap->n_gens() == 2, "Only support two-generation heap"); 95 96 TwoGenerationCollectorPolicy* two_gen_policy = policy->as_two_generation_policy(); 97 if (two_gen_policy != NULL) { 98 GenerationSpec** specs = two_gen_policy->generations(); 99 Generation::Name kind = specs[0]->name(); 100 switch (kind) { 101 case Generation::DefNew: 102 _minor_gc_manager = MemoryManager::get_copy_memory_manager(); 103 break; 104 #ifndef SERIALGC 105 case Generation::ParNew: 106 case Generation::ASParNew: 107 _minor_gc_manager = MemoryManager::get_parnew_memory_manager(); 108 break; 109 #endif // SERIALGC 110 default: 111 guarantee(false, "Unrecognized generation spec"); 112 break; 113 } 114 if (policy->is_mark_sweep_policy()) { 115 _major_gc_manager = MemoryManager::get_msc_memory_manager(); 116 #ifndef SERIALGC 117 } else if (policy->is_concurrent_mark_sweep_policy()) { 118 _major_gc_manager = MemoryManager::get_cms_memory_manager(); 119 #endif // SERIALGC 120 } else { 121 guarantee(false, "Unknown two-gen policy"); 122 } 123 } else { 124 guarantee(false, "Non two-gen policy"); 125 } 126 _managers_list->append(_minor_gc_manager); 127 _managers_list->append(_major_gc_manager); 128 129 add_generation_memory_pool(heap->get_gen(minor), _major_gc_manager, _minor_gc_manager); 130 add_generation_memory_pool(heap->get_gen(major), _major_gc_manager); 131 132 PermGen::Name name = policy->permanent_generation()->name(); 133 switch (name) { 134 case PermGen::MarkSweepCompact: { 135 CompactingPermGenGen* perm_gen = (CompactingPermGenGen*) heap->perm_gen(); 136 add_compact_perm_gen_memory_pool(perm_gen, _major_gc_manager); 137 break; 138 } 139 #ifndef SERIALGC 140 case PermGen::ConcurrentMarkSweep: { 141 CMSPermGenGen* cms_gen = (CMSPermGenGen*) heap->perm_gen(); 142 add_cms_perm_gen_memory_pool(cms_gen, _major_gc_manager); 143 break; 144 } 145 #endif // SERIALGC 146 default: 147 guarantee(false, "Unrecognized perm generation"); 148 break; 149 } 150 } 151 152 #ifndef SERIALGC 153 // Add memory pools for ParallelScavengeHeap 154 // This function currently only supports two generations collected heap. 155 // The collector for ParallelScavengeHeap will have two memory managers. 156 void MemoryService::add_parallel_scavenge_heap_info(ParallelScavengeHeap* heap) { 157 // Two managers to keep statistics about _minor_gc_manager and _major_gc_manager GC. 158 _minor_gc_manager = MemoryManager::get_psScavenge_memory_manager(); 159 _major_gc_manager = MemoryManager::get_psMarkSweep_memory_manager(); 160 _managers_list->append(_minor_gc_manager); 161 _managers_list->append(_major_gc_manager); 162 163 add_psYoung_memory_pool(heap->young_gen(), _major_gc_manager, _minor_gc_manager); 164 add_psOld_memory_pool(heap->old_gen(), _major_gc_manager); 165 add_psPerm_memory_pool(heap->perm_gen(), _major_gc_manager); 166 } 167 168 void MemoryService::add_g1_heap_info(G1CollectedHeap* g1h) { 169 assert(UseG1GC, "sanity"); 170 171 _minor_gc_manager = MemoryManager::get_g1YoungGen_memory_manager(); 172 _major_gc_manager = MemoryManager::get_g1OldGen_memory_manager(); 173 _managers_list->append(_minor_gc_manager); 174 _managers_list->append(_major_gc_manager); 175 176 add_g1YoungGen_memory_pool(g1h, _major_gc_manager, _minor_gc_manager); 177 add_g1OldGen_memory_pool(g1h, _major_gc_manager); 178 add_g1PermGen_memory_pool(g1h, _major_gc_manager); 179 } 180 #endif // SERIALGC 181 182 MemoryPool* MemoryService::add_gen(Generation* gen, 183 const char* name, 184 bool is_heap, 185 bool support_usage_threshold) { 186 187 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 188 GenerationPool* pool = new GenerationPool(gen, name, type, support_usage_threshold); 189 _pools_list->append(pool); 190 return (MemoryPool*) pool; 191 } 192 193 MemoryPool* MemoryService::add_space(ContiguousSpace* space, 194 const char* name, 195 bool is_heap, 196 size_t max_size, 197 bool support_usage_threshold) { 198 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 199 ContiguousSpacePool* pool = new ContiguousSpacePool(space, name, type, max_size, support_usage_threshold); 200 201 _pools_list->append(pool); 202 return (MemoryPool*) pool; 203 } 204 205 MemoryPool* MemoryService::add_survivor_spaces(DefNewGeneration* gen, 206 const char* name, 207 bool is_heap, 208 size_t max_size, 209 bool support_usage_threshold) { 210 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 211 SurvivorContiguousSpacePool* pool = new SurvivorContiguousSpacePool(gen, name, type, max_size, support_usage_threshold); 212 213 _pools_list->append(pool); 214 return (MemoryPool*) pool; 215 } 216 217 #ifndef SERIALGC 218 MemoryPool* MemoryService::add_cms_space(CompactibleFreeListSpace* space, 219 const char* name, 220 bool is_heap, 221 size_t max_size, 222 bool support_usage_threshold) { 223 MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap); 224 CompactibleFreeListSpacePool* pool = new CompactibleFreeListSpacePool(space, name, type, max_size, support_usage_threshold); 225 _pools_list->append(pool); 226 return (MemoryPool*) pool; 227 } 228 #endif // SERIALGC 229 230 // Add memory pool(s) for one generation 231 void MemoryService::add_generation_memory_pool(Generation* gen, 232 MemoryManager* major_mgr, 233 MemoryManager* minor_mgr) { 234 Generation::Name kind = gen->kind(); 235 int index = _pools_list->length(); 236 237 switch (kind) { 238 case Generation::DefNew: { 239 assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers"); 240 DefNewGeneration* young_gen = (DefNewGeneration*) gen; 241 // Add a memory pool for each space and young gen doesn't 242 // support low memory detection as it is expected to get filled up. 243 MemoryPool* eden = add_space(young_gen->eden(), 244 "Eden Space", 245 true, /* is_heap */ 246 young_gen->max_eden_size(), 247 false /* support_usage_threshold */); 248 MemoryPool* survivor = add_survivor_spaces(young_gen, 249 "Survivor Space", 250 true, /* is_heap */ 251 young_gen->max_survivor_size(), 252 false /* support_usage_threshold */); 253 break; 254 } 255 256 #ifndef SERIALGC 257 case Generation::ParNew: 258 case Generation::ASParNew: 259 { 260 assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers"); 261 // Add a memory pool for each space and young gen doesn't 262 // support low memory detection as it is expected to get filled up. 263 ParNewGeneration* parnew_gen = (ParNewGeneration*) gen; 264 MemoryPool* eden = add_space(parnew_gen->eden(), 265 "Par Eden Space", 266 true /* is_heap */, 267 parnew_gen->max_eden_size(), 268 false /* support_usage_threshold */); 269 MemoryPool* survivor = add_survivor_spaces(parnew_gen, 270 "Par Survivor Space", 271 true, /* is_heap */ 272 parnew_gen->max_survivor_size(), 273 false /* support_usage_threshold */); 274 275 break; 276 } 277 #endif // SERIALGC 278 279 case Generation::MarkSweepCompact: { 280 assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager"); 281 add_gen(gen, 282 "Tenured Gen", 283 true, /* is_heap */ 284 true /* support_usage_threshold */); 285 break; 286 } 287 288 #ifndef SERIALGC 289 case Generation::ConcurrentMarkSweep: 290 case Generation::ASConcurrentMarkSweep: 291 { 292 assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager"); 293 ConcurrentMarkSweepGeneration* cms = (ConcurrentMarkSweepGeneration*) gen; 294 MemoryPool* pool = add_cms_space(cms->cmsSpace(), 295 "CMS Old Gen", 296 true, /* is_heap */ 297 cms->reserved().byte_size(), 298 true /* support_usage_threshold */); 299 break; 300 } 301 #endif // SERIALGC 302 303 default: 304 assert(false, "should not reach here"); 305 // no memory pool added for others 306 break; 307 } 308 309 assert(major_mgr != NULL, "Should have at least one manager"); 310 // Link managers and the memory pools together 311 for (int i = index; i < _pools_list->length(); i++) { 312 MemoryPool* pool = _pools_list->at(i); 313 major_mgr->add_pool(pool); 314 if (minor_mgr != NULL) { 315 minor_mgr->add_pool(pool); 316 } 317 } 318 } 319 320 void MemoryService::add_compact_perm_gen_memory_pool(CompactingPermGenGen* perm_gen, 321 MemoryManager* mgr) { 322 PermanentGenerationSpec* spec = perm_gen->spec(); 323 size_t max_size = spec->max_size() - spec->read_only_size() - spec->read_write_size(); 324 MemoryPool* pool = add_space(perm_gen->unshared_space(), 325 "Perm Gen", 326 false, /* is_heap */ 327 max_size, 328 true /* support_usage_threshold */); 329 mgr->add_pool(pool); 330 if (UseSharedSpaces) { 331 pool = add_space(perm_gen->ro_space(), 332 "Perm Gen [shared-ro]", 333 false, /* is_heap */ 334 spec->read_only_size(), 335 true /* support_usage_threshold */); 336 mgr->add_pool(pool); 337 338 pool = add_space(perm_gen->rw_space(), 339 "Perm Gen [shared-rw]", 340 false, /* is_heap */ 341 spec->read_write_size(), 342 true /* support_usage_threshold */); 343 mgr->add_pool(pool); 344 } 345 } 346 347 #ifndef SERIALGC 348 void MemoryService::add_cms_perm_gen_memory_pool(CMSPermGenGen* cms_gen, 349 MemoryManager* mgr) { 350 351 MemoryPool* pool = add_cms_space(cms_gen->cmsSpace(), 352 "CMS Perm Gen", 353 false, /* is_heap */ 354 cms_gen->reserved().byte_size(), 355 true /* support_usage_threshold */); 356 mgr->add_pool(pool); 357 } 358 359 void MemoryService::add_psYoung_memory_pool(PSYoungGen* gen, MemoryManager* major_mgr, MemoryManager* minor_mgr) { 360 assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers"); 361 362 // Add a memory pool for each space and young gen doesn't 363 // support low memory detection as it is expected to get filled up. 364 EdenMutableSpacePool* eden = new EdenMutableSpacePool(gen, 365 gen->eden_space(), 366 "PS Eden Space", 367 MemoryPool::Heap, 368 false /* support_usage_threshold */); 369 370 SurvivorMutableSpacePool* survivor = new SurvivorMutableSpacePool(gen, 371 "PS Survivor Space", 372 MemoryPool::Heap, 373 false /* support_usage_threshold */); 374 375 major_mgr->add_pool(eden); 376 major_mgr->add_pool(survivor); 377 minor_mgr->add_pool(eden); 378 minor_mgr->add_pool(survivor); 379 _pools_list->append(eden); 380 _pools_list->append(survivor); 381 } 382 383 void MemoryService::add_psOld_memory_pool(PSOldGen* gen, MemoryManager* mgr) { 384 PSGenerationPool* old_gen = new PSGenerationPool(gen, 385 "PS Old Gen", 386 MemoryPool::Heap, 387 true /* support_usage_threshold */); 388 mgr->add_pool(old_gen); 389 _pools_list->append(old_gen); 390 } 391 392 void MemoryService::add_psPerm_memory_pool(PSPermGen* gen, MemoryManager* mgr) { 393 PSGenerationPool* perm_gen = new PSGenerationPool(gen, 394 "PS Perm Gen", 395 MemoryPool::NonHeap, 396 true /* support_usage_threshold */); 397 mgr->add_pool(perm_gen); 398 _pools_list->append(perm_gen); 399 } 400 401 void MemoryService::add_g1YoungGen_memory_pool(G1CollectedHeap* g1h, 402 MemoryManager* major_mgr, 403 MemoryManager* minor_mgr) { 404 assert(major_mgr != NULL && minor_mgr != NULL, "should have two managers"); 405 406 G1EdenPool* eden = new G1EdenPool(g1h); 407 G1SurvivorPool* survivor = new G1SurvivorPool(g1h); 408 409 major_mgr->add_pool(eden); 410 major_mgr->add_pool(survivor); 411 minor_mgr->add_pool(eden); 412 minor_mgr->add_pool(survivor); 413 _pools_list->append(eden); 414 _pools_list->append(survivor); 415 } 416 417 void MemoryService::add_g1OldGen_memory_pool(G1CollectedHeap* g1h, 418 MemoryManager* mgr) { 419 assert(mgr != NULL, "should have one manager"); 420 421 G1OldGenPool* old_gen = new G1OldGenPool(g1h); 422 mgr->add_pool(old_gen); 423 _pools_list->append(old_gen); 424 } 425 426 void MemoryService::add_g1PermGen_memory_pool(G1CollectedHeap* g1h, 427 MemoryManager* mgr) { 428 assert(mgr != NULL, "should have one manager"); 429 430 CompactingPermGenGen* perm_gen = (CompactingPermGenGen*) g1h->perm_gen(); 431 PermanentGenerationSpec* spec = perm_gen->spec(); 432 size_t max_size = spec->max_size() - spec->read_only_size() 433 - spec->read_write_size(); 434 MemoryPool* pool = add_space(perm_gen->unshared_space(), 435 "G1 Perm Gen", 436 false, /* is_heap */ 437 max_size, 438 true /* support_usage_threshold */); 439 mgr->add_pool(pool); 440 441 // in case we support CDS in G1 442 if (UseSharedSpaces) { 443 pool = add_space(perm_gen->ro_space(), 444 "G1 Perm Gen [shared-ro]", 445 false, /* is_heap */ 446 spec->read_only_size(), 447 true /* support_usage_threshold */); 448 mgr->add_pool(pool); 449 450 pool = add_space(perm_gen->rw_space(), 451 "G1 Perm Gen [shared-rw]", 452 false, /* is_heap */ 453 spec->read_write_size(), 454 true /* support_usage_threshold */); 455 mgr->add_pool(pool); 456 } 457 } 458 #endif // SERIALGC 459 460 void MemoryService::add_code_heap_memory_pool(CodeHeap* heap) { 461 _code_heap_pool = new CodeHeapPool(heap, 462 "Code Cache", 463 true /* support_usage_threshold */); 464 MemoryManager* mgr = MemoryManager::get_code_cache_memory_manager(); 465 mgr->add_pool(_code_heap_pool); 466 467 _pools_list->append(_code_heap_pool); 468 _managers_list->append(mgr); 469 } 470 471 MemoryManager* MemoryService::get_memory_manager(instanceHandle mh) { 472 for (int i = 0; i < _managers_list->length(); i++) { 473 MemoryManager* mgr = _managers_list->at(i); 474 if (mgr->is_manager(mh)) { 475 return mgr; 476 } 477 } 478 return NULL; 479 } 480 481 MemoryPool* MemoryService::get_memory_pool(instanceHandle ph) { 482 for (int i = 0; i < _pools_list->length(); i++) { 483 MemoryPool* pool = _pools_list->at(i); 484 if (pool->is_pool(ph)) { 485 return pool; 486 } 487 } 488 return NULL; 489 } 490 491 void MemoryService::track_memory_usage() { 492 // Track the peak memory usage 493 for (int i = 0; i < _pools_list->length(); i++) { 494 MemoryPool* pool = _pools_list->at(i); 495 pool->record_peak_memory_usage(); 496 } 497 498 // Detect low memory 499 LowMemoryDetector::detect_low_memory(); 500 } 501 502 void MemoryService::track_memory_pool_usage(MemoryPool* pool) { 503 // Track the peak memory usage 504 pool->record_peak_memory_usage(); 505 506 // Detect low memory 507 if (LowMemoryDetector::is_enabled(pool)) { 508 LowMemoryDetector::detect_low_memory(pool); 509 } 510 } 511 512 void MemoryService::gc_begin(bool fullGC) { 513 GCMemoryManager* mgr; 514 if (fullGC) { 515 mgr = _major_gc_manager; 516 } else { 517 mgr = _minor_gc_manager; 518 } 519 assert(mgr->is_gc_memory_manager(), "Sanity check"); 520 mgr->gc_begin(); 521 522 // Track the peak memory usage when GC begins 523 for (int i = 0; i < _pools_list->length(); i++) { 524 MemoryPool* pool = _pools_list->at(i); 525 pool->record_peak_memory_usage(); 526 } 527 } 528 529 void MemoryService::gc_end(bool fullGC) { 530 GCMemoryManager* mgr; 531 if (fullGC) { 532 mgr = (GCMemoryManager*) _major_gc_manager; 533 } else { 534 mgr = (GCMemoryManager*) _minor_gc_manager; 535 } 536 assert(mgr->is_gc_memory_manager(), "Sanity check"); 537 538 // register the GC end statistics and memory usage 539 mgr->gc_end(); 540 } 541 542 void MemoryService::oops_do(OopClosure* f) { 543 int i; 544 545 for (i = 0; i < _pools_list->length(); i++) { 546 MemoryPool* pool = _pools_list->at(i); 547 pool->oops_do(f); 548 } 549 for (i = 0; i < _managers_list->length(); i++) { 550 MemoryManager* mgr = _managers_list->at(i); 551 mgr->oops_do(f); 552 } 553 } 554 555 bool MemoryService::set_verbose(bool verbose) { 556 MutexLocker m(Management_lock); 557 // verbose will be set to the previous value 558 bool succeed = CommandLineFlags::boolAtPut((char*)"PrintGC", &verbose, MANAGEMENT); 559 assert(succeed, "Setting PrintGC flag fails"); 560 ClassLoadingService::reset_trace_class_unloading(); 561 562 return verbose; 563 } 564 565 Handle MemoryService::create_MemoryUsage_obj(MemoryUsage usage, TRAPS) { 566 klassOop k = Management::java_lang_management_MemoryUsage_klass(CHECK_NH); 567 instanceKlassHandle ik(THREAD, k); 568 569 instanceHandle obj = ik->allocate_instance_handle(CHECK_NH); 570 571 JavaValue result(T_VOID); 572 JavaCallArguments args(10); 573 args.push_oop(obj); // receiver 574 args.push_long(usage.init_size_as_jlong()); // Argument 1 575 args.push_long(usage.used_as_jlong()); // Argument 2 576 args.push_long(usage.committed_as_jlong()); // Argument 3 577 args.push_long(usage.max_size_as_jlong()); // Argument 4 578 579 JavaCalls::call_special(&result, 580 ik, 581 vmSymbolHandles::object_initializer_name(), 582 vmSymbolHandles::long_long_long_long_void_signature(), 583 &args, 584 CHECK_NH); 585 return obj; 586 } 587 // 588 // GC manager type depends on the type of Generation. Depending the space 589 // availablity and vm option the gc uses major gc manager or minor gc 590 // manager or both. The type of gc manager depends on the generation kind. 591 // For DefNew, ParNew and ASParNew generation doing scavange gc uses minor 592 // gc manager (so _fullGC is set to false ) and for other generation kind 593 // DOing mark-sweep-compact uses major gc manager (so _fullGC is set 594 // to true). 595 TraceMemoryManagerStats::TraceMemoryManagerStats(Generation::Name kind) { 596 switch (kind) { 597 case Generation::DefNew: 598 #ifndef SERIALGC 599 case Generation::ParNew: 600 case Generation::ASParNew: 601 #endif // SERIALGC 602 _fullGC=false; 603 break; 604 case Generation::MarkSweepCompact: 605 #ifndef SERIALGC 606 case Generation::ConcurrentMarkSweep: 607 case Generation::ASConcurrentMarkSweep: 608 #endif // SERIALGC 609 _fullGC=true; 610 break; 611 default: 612 assert(false, "Unrecognized gc generation kind."); 613 } 614 MemoryService::gc_begin(_fullGC); 615 } 616 TraceMemoryManagerStats::TraceMemoryManagerStats(bool fullGC) { 617 _fullGC = fullGC; 618 MemoryService::gc_begin(_fullGC); 619 } 620 621 TraceMemoryManagerStats::~TraceMemoryManagerStats() { 622 MemoryService::gc_end(_fullGC); 623 }