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/globals.hpp"
  39 #include "runtime/javaCalls.hpp"
  40 #include "services/classLoadingService.hpp"
  41 #include "services/lowMemoryDetector.hpp"
  42 #include "services/management.hpp"
  43 #include "services/memoryManager.hpp"
  44 #include "services/memoryPool.hpp"
  45 #include "services/memoryService.hpp"
  46 #include "utilities/growableArray.hpp"
  47 #include "utilities/macros.hpp"
  48 #if INCLUDE_ALL_GCS
  49 #include "gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.hpp"
  50 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp"
  51 #include "gc_implementation/parNew/parNewGeneration.hpp"
  52 #include "gc_implementation/parallelScavenge/parallelScavengeHeap.hpp"
  53 #include "gc_implementation/parallelScavenge/psOldGen.hpp"
  54 #include "gc_implementation/parallelScavenge/psYoungGen.hpp"
  55 #include "services/g1MemoryPool.hpp"
  56 #include "services/psMemoryPool.hpp"
  57 #endif // INCLUDE_ALL_GCS
  58 
  59 GrowableArray<MemoryPool*>* MemoryService::_pools_list =
  60   new (ResourceObj::C_HEAP, mtInternal) GrowableArray<MemoryPool*>(init_pools_list_size, true);
  61 GrowableArray<MemoryManager*>* MemoryService::_managers_list =
  62   new (ResourceObj::C_HEAP, mtInternal) GrowableArray<MemoryManager*>(init_managers_list_size, true);
  63 
  64 GCMemoryManager* MemoryService::_minor_gc_manager      = NULL;
  65 GCMemoryManager* MemoryService::_major_gc_manager      = NULL;
  66 MemoryManager*   MemoryService::_code_cache_manager    = NULL;
  67 GrowableArray<MemoryPool*>* MemoryService::_code_heap_pools =
  68     new (ResourceObj::C_HEAP, mtInternal) GrowableArray<MemoryPool*>(init_code_heap_pools_size, true);
  69 MemoryPool*      MemoryService::_metaspace_pool        = NULL;
  70 MemoryPool*      MemoryService::_compressed_class_pool = NULL;
  71 
  72 class GcThreadCountClosure: public ThreadClosure {
  73  private:
  74   int _count;
  75  public:
  76   GcThreadCountClosure() : _count(0) {};
  77   void do_thread(Thread* thread);
  78   int count() { return _count; }
  79 };
  80 
  81 void GcThreadCountClosure::do_thread(Thread* thread) {
  82   _count++;
  83 }
  84 
  85 void MemoryService::set_universe_heap(CollectedHeap* heap) {
  86   CollectedHeap::Name kind = heap->kind();
  87   switch (kind) {
  88     case CollectedHeap::GenCollectedHeap : {
  89       add_gen_collected_heap_info(GenCollectedHeap::heap());
  90       break;
  91     }
  92 #if INCLUDE_ALL_GCS
  93     case CollectedHeap::ParallelScavengeHeap : {
  94       add_parallel_scavenge_heap_info(ParallelScavengeHeap::heap());
  95       break;
  96     }
  97     case CollectedHeap::G1CollectedHeap : {
  98       add_g1_heap_info(G1CollectedHeap::heap());
  99       break;
 100     }
 101 #endif // INCLUDE_ALL_GCS
 102     default: {
 103       guarantee(false, "Unrecognized kind of heap");
 104     }
 105   }
 106 
 107   // set the GC thread count
 108   GcThreadCountClosure gctcc;
 109   heap->gc_threads_do(&gctcc);
 110   int count = gctcc.count();
 111   if (count > 0) {
 112     _minor_gc_manager->set_num_gc_threads(count);
 113     _major_gc_manager->set_num_gc_threads(count);
 114   }
 115 
 116   // All memory pools and memory managers are initialized.
 117   //
 118   _minor_gc_manager->initialize_gc_stat_info();
 119   _major_gc_manager->initialize_gc_stat_info();
 120 }
 121 
 122 // Add memory pools for GenCollectedHeap
 123 // This function currently only supports two generations collected heap.
 124 // The collector for GenCollectedHeap will have two memory managers.
 125 void MemoryService::add_gen_collected_heap_info(GenCollectedHeap* heap) {
 126   CollectorPolicy* policy = heap->collector_policy();
 127 
 128   assert(policy->is_two_generation_policy(), "Only support two generations");
 129   guarantee(heap->n_gens() == 2, "Only support two-generation heap");
 130 
 131   TwoGenerationCollectorPolicy* two_gen_policy = policy->as_two_generation_policy();
 132   if (two_gen_policy != NULL) {
 133     GenerationSpec** specs = two_gen_policy->generations();
 134     Generation::Name kind = specs[0]->name();
 135     switch (kind) {
 136       case Generation::DefNew:
 137         _minor_gc_manager = MemoryManager::get_copy_memory_manager();
 138         break;
 139 #if INCLUDE_ALL_GCS
 140       case Generation::ParNew:
 141       case Generation::ASParNew:
 142         _minor_gc_manager = MemoryManager::get_parnew_memory_manager();
 143         break;
 144 #endif // INCLUDE_ALL_GCS
 145       default:
 146         guarantee(false, "Unrecognized generation spec");
 147         break;
 148     }
 149     if (policy->is_mark_sweep_policy()) {
 150       _major_gc_manager = MemoryManager::get_msc_memory_manager();
 151 #if INCLUDE_ALL_GCS
 152     } else if (policy->is_concurrent_mark_sweep_policy()) {
 153       _major_gc_manager = MemoryManager::get_cms_memory_manager();
 154 #endif // INCLUDE_ALL_GCS
 155     } else {
 156       guarantee(false, "Unknown two-gen policy");
 157     }
 158   } else {
 159     guarantee(false, "Non two-gen policy");
 160   }
 161   _managers_list->append(_minor_gc_manager);
 162   _managers_list->append(_major_gc_manager);
 163 
 164   add_generation_memory_pool(heap->get_gen(minor), _major_gc_manager, _minor_gc_manager);
 165   add_generation_memory_pool(heap->get_gen(major), _major_gc_manager);
 166 }
 167 
 168 #if INCLUDE_ALL_GCS
 169 // Add memory pools for ParallelScavengeHeap
 170 // This function currently only supports two generations collected heap.
 171 // The collector for ParallelScavengeHeap will have two memory managers.
 172 void MemoryService::add_parallel_scavenge_heap_info(ParallelScavengeHeap* heap) {
 173   // Two managers to keep statistics about _minor_gc_manager and _major_gc_manager GC.
 174   _minor_gc_manager = MemoryManager::get_psScavenge_memory_manager();
 175   _major_gc_manager = MemoryManager::get_psMarkSweep_memory_manager();
 176   _managers_list->append(_minor_gc_manager);
 177   _managers_list->append(_major_gc_manager);
 178 
 179   add_psYoung_memory_pool(heap->young_gen(), _major_gc_manager, _minor_gc_manager);
 180   add_psOld_memory_pool(heap->old_gen(), _major_gc_manager);
 181 }
 182 
 183 void MemoryService::add_g1_heap_info(G1CollectedHeap* g1h) {
 184   assert(UseG1GC, "sanity");
 185 
 186   _minor_gc_manager = MemoryManager::get_g1YoungGen_memory_manager();
 187   _major_gc_manager = MemoryManager::get_g1OldGen_memory_manager();
 188   _managers_list->append(_minor_gc_manager);
 189   _managers_list->append(_major_gc_manager);
 190 
 191   add_g1YoungGen_memory_pool(g1h, _major_gc_manager, _minor_gc_manager);
 192   add_g1OldGen_memory_pool(g1h, _major_gc_manager);
 193 }
 194 #endif // INCLUDE_ALL_GCS
 195 
 196 MemoryPool* MemoryService::add_gen(Generation* gen,
 197                                    const char* name,
 198                                    bool is_heap,
 199                                    bool support_usage_threshold) {
 200 
 201   MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap);
 202   GenerationPool* pool = new GenerationPool(gen, name, type, support_usage_threshold);
 203   _pools_list->append(pool);
 204   return (MemoryPool*) pool;
 205 }
 206 
 207 MemoryPool* MemoryService::add_space(ContiguousSpace* space,
 208                                      const char* name,
 209                                      bool is_heap,
 210                                      size_t max_size,
 211                                      bool support_usage_threshold) {
 212   MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap);
 213   ContiguousSpacePool* pool = new ContiguousSpacePool(space, name, type, max_size, support_usage_threshold);
 214 
 215   _pools_list->append(pool);
 216   return (MemoryPool*) pool;
 217 }
 218 
 219 MemoryPool* MemoryService::add_survivor_spaces(DefNewGeneration* gen,
 220                                                const char* name,
 221                                                bool is_heap,
 222                                                size_t max_size,
 223                                                bool support_usage_threshold) {
 224   MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap);
 225   SurvivorContiguousSpacePool* pool = new SurvivorContiguousSpacePool(gen, name, type, max_size, support_usage_threshold);
 226 
 227   _pools_list->append(pool);
 228   return (MemoryPool*) pool;
 229 }
 230 
 231 #if INCLUDE_ALL_GCS
 232 MemoryPool* MemoryService::add_cms_space(CompactibleFreeListSpace* space,
 233                                          const char* name,
 234                                          bool is_heap,
 235                                          size_t max_size,
 236                                          bool support_usage_threshold) {
 237   MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap);
 238   CompactibleFreeListSpacePool* pool = new CompactibleFreeListSpacePool(space, name, type, max_size, support_usage_threshold);
 239   _pools_list->append(pool);
 240   return (MemoryPool*) pool;
 241 }
 242 #endif // INCLUDE_ALL_GCS
 243 
 244 // Add memory pool(s) for one generation
 245 void MemoryService::add_generation_memory_pool(Generation* gen,
 246                                                MemoryManager* major_mgr,
 247                                                MemoryManager* minor_mgr) {
 248   guarantee(gen != NULL, "No generation for memory pool");
 249   Generation::Name kind = gen->kind();
 250   int index = _pools_list->length();
 251 
 252   switch (kind) {
 253     case Generation::DefNew: {
 254       assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers");
 255       DefNewGeneration* young_gen = (DefNewGeneration*) gen;
 256       // Add a memory pool for each space and young gen doesn't
 257       // support low memory detection as it is expected to get filled up.
 258       MemoryPool* eden = add_space(young_gen->eden(),
 259                                    "Eden Space",
 260                                    true, /* is_heap */
 261                                    young_gen->max_eden_size(),
 262                                    false /* support_usage_threshold */);
 263       MemoryPool* survivor = add_survivor_spaces(young_gen,
 264                                                  "Survivor Space",
 265                                                  true, /* is_heap */
 266                                                  young_gen->max_survivor_size(),
 267                                                  false /* support_usage_threshold */);
 268       break;
 269     }
 270 
 271 #if INCLUDE_ALL_GCS
 272     case Generation::ParNew:
 273     case Generation::ASParNew:
 274     {
 275       assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers");
 276       // Add a memory pool for each space and young gen doesn't
 277       // support low memory detection as it is expected to get filled up.
 278       ParNewGeneration* parnew_gen = (ParNewGeneration*) gen;
 279       MemoryPool* eden = add_space(parnew_gen->eden(),
 280                                    "Par Eden Space",
 281                                    true /* is_heap */,
 282                                    parnew_gen->max_eden_size(),
 283                                    false /* support_usage_threshold */);
 284       MemoryPool* survivor = add_survivor_spaces(parnew_gen,
 285                                                  "Par Survivor Space",
 286                                                  true, /* is_heap */
 287                                                  parnew_gen->max_survivor_size(),
 288                                                  false /* support_usage_threshold */);
 289 
 290       break;
 291     }
 292 #endif // INCLUDE_ALL_GCS
 293 
 294     case Generation::MarkSweepCompact: {
 295       assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager");
 296       add_gen(gen,
 297               "Tenured Gen",
 298               true, /* is_heap */
 299               true  /* support_usage_threshold */);
 300       break;
 301     }
 302 
 303 #if INCLUDE_ALL_GCS
 304     case Generation::ConcurrentMarkSweep:
 305     case Generation::ASConcurrentMarkSweep:
 306     {
 307       assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager");
 308       ConcurrentMarkSweepGeneration* cms = (ConcurrentMarkSweepGeneration*) gen;
 309       MemoryPool* pool = add_cms_space(cms->cmsSpace(),
 310                                        "CMS Old Gen",
 311                                        true, /* is_heap */
 312                                        cms->reserved().byte_size(),
 313                                        true  /* support_usage_threshold */);
 314       break;
 315     }
 316 #endif // INCLUDE_ALL_GCS
 317 
 318     default:
 319       assert(false, "should not reach here");
 320       // no memory pool added for others
 321       break;
 322   }
 323 
 324   assert(major_mgr != NULL, "Should have at least one manager");
 325   // Link managers and the memory pools together
 326   for (int i = index; i < _pools_list->length(); i++) {
 327     MemoryPool* pool = _pools_list->at(i);
 328     major_mgr->add_pool(pool);
 329     if (minor_mgr != NULL) {
 330       minor_mgr->add_pool(pool);
 331     }
 332   }
 333 }
 334 
 335 
 336 #if INCLUDE_ALL_GCS
 337 void MemoryService::add_psYoung_memory_pool(PSYoungGen* gen, MemoryManager* major_mgr, MemoryManager* minor_mgr) {
 338   assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers");
 339 
 340   // Add a memory pool for each space and young gen doesn't
 341   // support low memory detection as it is expected to get filled up.
 342   EdenMutableSpacePool* eden = new EdenMutableSpacePool(gen,
 343                                                         gen->eden_space(),
 344                                                         "PS Eden Space",
 345                                                         MemoryPool::Heap,
 346                                                         false /* support_usage_threshold */);
 347 
 348   SurvivorMutableSpacePool* survivor = new SurvivorMutableSpacePool(gen,
 349                                                                     "PS Survivor Space",
 350                                                                     MemoryPool::Heap,
 351                                                                     false /* support_usage_threshold */);
 352 
 353   major_mgr->add_pool(eden);
 354   major_mgr->add_pool(survivor);
 355   minor_mgr->add_pool(eden);
 356   minor_mgr->add_pool(survivor);
 357   _pools_list->append(eden);
 358   _pools_list->append(survivor);
 359 }
 360 
 361 void MemoryService::add_psOld_memory_pool(PSOldGen* gen, MemoryManager* mgr) {
 362   PSGenerationPool* old_gen = new PSGenerationPool(gen,
 363                                                    "PS Old Gen",
 364                                                    MemoryPool::Heap,
 365                                                    true /* support_usage_threshold */);
 366   mgr->add_pool(old_gen);
 367   _pools_list->append(old_gen);
 368 }
 369 
 370 void MemoryService::add_g1YoungGen_memory_pool(G1CollectedHeap* g1h,
 371                                                MemoryManager* major_mgr,
 372                                                MemoryManager* minor_mgr) {
 373   assert(major_mgr != NULL && minor_mgr != NULL, "should have two managers");
 374 
 375   G1EdenPool* eden = new G1EdenPool(g1h);
 376   G1SurvivorPool* survivor = new G1SurvivorPool(g1h);
 377 
 378   major_mgr->add_pool(eden);
 379   major_mgr->add_pool(survivor);
 380   minor_mgr->add_pool(eden);
 381   minor_mgr->add_pool(survivor);
 382   _pools_list->append(eden);
 383   _pools_list->append(survivor);
 384 }
 385 
 386 void MemoryService::add_g1OldGen_memory_pool(G1CollectedHeap* g1h,
 387                                              MemoryManager* mgr) {
 388   assert(mgr != NULL, "should have one manager");
 389 
 390   G1OldGenPool* old_gen = new G1OldGenPool(g1h);
 391   mgr->add_pool(old_gen);
 392   _pools_list->append(old_gen);
 393 }
 394 #endif // INCLUDE_ALL_GCS
 395 
 396 void MemoryService::add_code_heap_memory_pool(CodeHeap* heap, const char* name) {
 397   // Create new memory pool for this heap
 398   MemoryPool* code_heap_pool = new CodeHeapPool(heap, name, true /* support_usage_threshold */);
 399 
 400   // Append to lists
 401   _code_heap_pools->append(code_heap_pool);
 402   _pools_list->append(code_heap_pool);
 403 
 404   if (_code_cache_manager == NULL) {
 405     // Create CodeCache memory manager
 406     _code_cache_manager = MemoryManager::get_code_cache_memory_manager();
 407     _managers_list->append(_code_cache_manager);
 408   }
 409 
 410   _code_cache_manager->add_pool(code_heap_pool);
 411 }
 412 
 413 void MemoryService::add_metaspace_memory_pools() {
 414   MemoryManager* mgr = MemoryManager::get_metaspace_memory_manager();
 415 
 416   _metaspace_pool = new MetaspacePool();
 417   mgr->add_pool(_metaspace_pool);
 418   _pools_list->append(_metaspace_pool);
 419 
 420   if (UseCompressedClassPointers) {
 421     _compressed_class_pool = new CompressedKlassSpacePool();
 422     mgr->add_pool(_compressed_class_pool);
 423     _pools_list->append(_compressed_class_pool);
 424   }
 425 
 426   _managers_list->append(mgr);
 427 }
 428 
 429 MemoryManager* MemoryService::get_memory_manager(instanceHandle mh) {
 430   for (int i = 0; i < _managers_list->length(); i++) {
 431     MemoryManager* mgr = _managers_list->at(i);
 432     if (mgr->is_manager(mh)) {
 433       return mgr;
 434     }
 435   }
 436   return NULL;
 437 }
 438 
 439 MemoryPool* MemoryService::get_memory_pool(instanceHandle ph) {
 440   for (int i = 0; i < _pools_list->length(); i++) {
 441     MemoryPool* pool = _pools_list->at(i);
 442     if (pool->is_pool(ph)) {
 443       return pool;
 444     }
 445   }
 446   return NULL;
 447 }
 448 
 449 void MemoryService::track_memory_usage() {
 450   // Track the peak memory usage
 451   for (int i = 0; i < _pools_list->length(); i++) {
 452     MemoryPool* pool = _pools_list->at(i);
 453     pool->record_peak_memory_usage();
 454   }
 455 
 456   // Detect low memory
 457   LowMemoryDetector::detect_low_memory();
 458 }
 459 
 460 void MemoryService::track_memory_pool_usage(MemoryPool* pool) {
 461   // Track the peak memory usage
 462   pool->record_peak_memory_usage();
 463 
 464   // Detect low memory
 465   if (LowMemoryDetector::is_enabled(pool)) {
 466     LowMemoryDetector::detect_low_memory(pool);
 467   }
 468 }
 469 
 470 void MemoryService::gc_begin(bool fullGC, bool recordGCBeginTime,
 471                              bool recordAccumulatedGCTime,
 472                              bool recordPreGCUsage, bool recordPeakUsage) {
 473 
 474   GCMemoryManager* mgr;
 475   if (fullGC) {
 476     mgr = _major_gc_manager;
 477   } else {
 478     mgr = _minor_gc_manager;
 479   }
 480   assert(mgr->is_gc_memory_manager(), "Sanity check");
 481   mgr->gc_begin(recordGCBeginTime, recordPreGCUsage, recordAccumulatedGCTime);
 482 
 483   // Track the peak memory usage when GC begins
 484   if (recordPeakUsage) {
 485     for (int i = 0; i < _pools_list->length(); i++) {
 486       MemoryPool* pool = _pools_list->at(i);
 487       pool->record_peak_memory_usage();
 488     }
 489   }
 490 }
 491 
 492 void MemoryService::gc_end(bool fullGC, bool recordPostGCUsage,
 493                            bool recordAccumulatedGCTime,
 494                            bool recordGCEndTime, bool countCollection,
 495                            GCCause::Cause cause) {
 496 
 497   GCMemoryManager* mgr;
 498   if (fullGC) {
 499     mgr = (GCMemoryManager*) _major_gc_manager;
 500   } else {
 501     mgr = (GCMemoryManager*) _minor_gc_manager;
 502   }
 503   assert(mgr->is_gc_memory_manager(), "Sanity check");
 504 
 505   // register the GC end statistics and memory usage
 506   mgr->gc_end(recordPostGCUsage, recordAccumulatedGCTime, recordGCEndTime,
 507               countCollection, cause);
 508 }
 509 
 510 void MemoryService::oops_do(OopClosure* f) {
 511   int i;
 512 
 513   for (i = 0; i < _pools_list->length(); i++) {
 514     MemoryPool* pool = _pools_list->at(i);
 515     pool->oops_do(f);
 516   }
 517   for (i = 0; i < _managers_list->length(); i++) {
 518     MemoryManager* mgr = _managers_list->at(i);
 519     mgr->oops_do(f);
 520   }
 521 }
 522 
 523 bool MemoryService::set_verbose(bool verbose) {
 524   MutexLocker m(Management_lock);
 525   // verbose will be set to the previous value
 526   bool succeed = CommandLineFlags::boolAtPut((char*)"PrintGC", &verbose, Flag::MANAGEMENT);
 527   assert(succeed, "Setting PrintGC flag fails");
 528   ClassLoadingService::reset_trace_class_unloading();
 529 
 530   return verbose;
 531 }
 532 
 533 Handle MemoryService::create_MemoryUsage_obj(MemoryUsage usage, TRAPS) {
 534   Klass* k = Management::java_lang_management_MemoryUsage_klass(CHECK_NH);
 535   instanceKlassHandle ik(THREAD, k);
 536 
 537   instanceHandle obj = ik->allocate_instance_handle(CHECK_NH);
 538 
 539   JavaValue result(T_VOID);
 540   JavaCallArguments args(10);
 541   args.push_oop(obj);                         // receiver
 542   args.push_long(usage.init_size_as_jlong()); // Argument 1
 543   args.push_long(usage.used_as_jlong());      // Argument 2
 544   args.push_long(usage.committed_as_jlong()); // Argument 3
 545   args.push_long(usage.max_size_as_jlong());  // Argument 4
 546 
 547   JavaCalls::call_special(&result,
 548                           ik,
 549                           vmSymbols::object_initializer_name(),
 550                           vmSymbols::long_long_long_long_void_signature(),
 551                           &args,
 552                           CHECK_NH);
 553   return obj;
 554 }
 555 //
 556 // GC manager type depends on the type of Generation. Depending on the space
 557 // availablity and vm options the gc uses major gc manager or minor gc
 558 // manager or both. The type of gc manager depends on the generation kind.
 559 // For DefNew, ParNew and ASParNew generation doing scavenge gc uses minor
 560 // gc manager (so _fullGC is set to false ) and for other generation kinds
 561 // doing mark-sweep-compact uses major gc manager (so _fullGC is set
 562 // to true).
 563 TraceMemoryManagerStats::TraceMemoryManagerStats(Generation::Name kind, GCCause::Cause cause) {
 564   switch (kind) {
 565     case Generation::DefNew:
 566 #if INCLUDE_ALL_GCS
 567     case Generation::ParNew:
 568     case Generation::ASParNew:
 569 #endif // INCLUDE_ALL_GCS
 570       _fullGC=false;
 571       break;
 572     case Generation::MarkSweepCompact:
 573 #if INCLUDE_ALL_GCS
 574     case Generation::ConcurrentMarkSweep:
 575     case Generation::ASConcurrentMarkSweep:
 576 #endif // INCLUDE_ALL_GCS
 577       _fullGC=true;
 578       break;
 579     default:
 580       assert(false, "Unrecognized gc generation kind.");
 581   }
 582   // this has to be called in a stop the world pause and represent
 583   // an entire gc pause, start to finish:
 584   initialize(_fullGC, cause,true, true, true, true, true, true, true);
 585 }
 586 TraceMemoryManagerStats::TraceMemoryManagerStats(bool fullGC,
 587                                                  GCCause::Cause cause,
 588                                                  bool recordGCBeginTime,
 589                                                  bool recordPreGCUsage,
 590                                                  bool recordPeakUsage,
 591                                                  bool recordPostGCUsage,
 592                                                  bool recordAccumulatedGCTime,
 593                                                  bool recordGCEndTime,
 594                                                  bool countCollection) {
 595     initialize(fullGC, cause, recordGCBeginTime, recordPreGCUsage, recordPeakUsage,
 596              recordPostGCUsage, recordAccumulatedGCTime, recordGCEndTime,
 597              countCollection);
 598 }
 599 
 600 // for a subclass to create then initialize an instance before invoking
 601 // the MemoryService
 602 void TraceMemoryManagerStats::initialize(bool fullGC,
 603                                          GCCause::Cause cause,
 604                                          bool recordGCBeginTime,
 605                                          bool recordPreGCUsage,
 606                                          bool recordPeakUsage,
 607                                          bool recordPostGCUsage,
 608                                          bool recordAccumulatedGCTime,
 609                                          bool recordGCEndTime,
 610                                          bool countCollection) {
 611   _fullGC = fullGC;
 612   _recordGCBeginTime = recordGCBeginTime;
 613   _recordPreGCUsage = recordPreGCUsage;
 614   _recordPeakUsage = recordPeakUsage;
 615   _recordPostGCUsage = recordPostGCUsage;
 616   _recordAccumulatedGCTime = recordAccumulatedGCTime;
 617   _recordGCEndTime = recordGCEndTime;
 618   _countCollection = countCollection;
 619   _cause = cause;
 620 
 621   MemoryService::gc_begin(_fullGC, _recordGCBeginTime, _recordAccumulatedGCTime,
 622                           _recordPreGCUsage, _recordPeakUsage);
 623 }
 624 
 625 TraceMemoryManagerStats::~TraceMemoryManagerStats() {
 626   MemoryService::gc_end(_fullGC, _recordPostGCUsage, _recordAccumulatedGCTime,
 627                         _recordGCEndTime, _countCollection, _cause);
 628 }