1 /*
   2  * Copyright (c) 2003, 2015, 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_generation_policy(), "Only support two generations");
 129   guarantee(heap->n_gens() == 2, "Only support two-generation heap");
 130 
 131   GenCollectorPolicy* gen_policy = policy->as_generation_policy();
 132   if (gen_policy != NULL) {
 133     Generation::Name kind = gen_policy->young_gen_spec()->name();
 134     switch (kind) {
 135       case Generation::DefNew:
 136         _minor_gc_manager = MemoryManager::get_copy_memory_manager();
 137         break;
 138 #if INCLUDE_ALL_GCS
 139       case Generation::ParNew:
 140         _minor_gc_manager = MemoryManager::get_parnew_memory_manager();
 141         break;
 142 #endif // INCLUDE_ALL_GCS
 143       default:
 144         guarantee(false, "Unrecognized generation spec");
 145         break;
 146     }
 147     if (policy->is_mark_sweep_policy()) {
 148       _major_gc_manager = MemoryManager::get_msc_memory_manager();
 149 #if INCLUDE_ALL_GCS
 150     } else if (policy->is_concurrent_mark_sweep_policy()) {
 151       _major_gc_manager = MemoryManager::get_cms_memory_manager();
 152 #endif // INCLUDE_ALL_GCS
 153     } else {
 154       guarantee(false, "Unknown two-gen policy");
 155     }
 156   } else {
 157     guarantee(false, "Non two-gen policy");
 158   }
 159   _managers_list->append(_minor_gc_manager);
 160   _managers_list->append(_major_gc_manager);
 161 
 162   add_generation_memory_pool(heap->young_gen(), _major_gc_manager, _minor_gc_manager);
 163   add_generation_memory_pool(heap->old_gen(), _major_gc_manager);
 164 }
 165 
 166 #if INCLUDE_ALL_GCS
 167 // Add memory pools for ParallelScavengeHeap
 168 // This function currently only supports two generations collected heap.
 169 // The collector for ParallelScavengeHeap will have two memory managers.
 170 void MemoryService::add_parallel_scavenge_heap_info(ParallelScavengeHeap* heap) {
 171   // Two managers to keep statistics about _minor_gc_manager and _major_gc_manager GC.
 172   _minor_gc_manager = MemoryManager::get_psScavenge_memory_manager();
 173   _major_gc_manager = MemoryManager::get_psMarkSweep_memory_manager();
 174   _managers_list->append(_minor_gc_manager);
 175   _managers_list->append(_major_gc_manager);
 176 
 177   add_psYoung_memory_pool(heap->young_gen(), _major_gc_manager, _minor_gc_manager);
 178   add_psOld_memory_pool(heap->old_gen(), _major_gc_manager);
 179 }
 180 
 181 void MemoryService::add_g1_heap_info(G1CollectedHeap* g1h) {
 182   assert(UseG1GC, "sanity");
 183 
 184   _minor_gc_manager = MemoryManager::get_g1YoungGen_memory_manager();
 185   _major_gc_manager = MemoryManager::get_g1OldGen_memory_manager();
 186   _managers_list->append(_minor_gc_manager);
 187   _managers_list->append(_major_gc_manager);
 188 
 189   add_g1YoungGen_memory_pool(g1h, _major_gc_manager, _minor_gc_manager);
 190   add_g1OldGen_memory_pool(g1h, _major_gc_manager);
 191 }
 192 #endif // INCLUDE_ALL_GCS
 193 
 194 MemoryPool* MemoryService::add_gen(Generation* gen,
 195                                    const char* name,
 196                                    bool is_heap,
 197                                    bool support_usage_threshold) {
 198 
 199   MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap);
 200   GenerationPool* pool = new GenerationPool(gen, name, type, support_usage_threshold);
 201   _pools_list->append(pool);
 202   return (MemoryPool*) pool;
 203 }
 204 
 205 MemoryPool* MemoryService::add_space(ContiguousSpace* space,
 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   ContiguousSpacePool* pool = new ContiguousSpacePool(space, name, type, max_size, support_usage_threshold);
 212 
 213   _pools_list->append(pool);
 214   return (MemoryPool*) pool;
 215 }
 216 
 217 MemoryPool* MemoryService::add_survivor_spaces(DefNewGeneration* gen,
 218                                                const char* name,
 219                                                bool is_heap,
 220                                                size_t max_size,
 221                                                bool support_usage_threshold) {
 222   MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap);
 223   SurvivorContiguousSpacePool* pool = new SurvivorContiguousSpacePool(gen, name, type, max_size, support_usage_threshold);
 224 
 225   _pools_list->append(pool);
 226   return (MemoryPool*) pool;
 227 }
 228 
 229 #if INCLUDE_ALL_GCS
 230 MemoryPool* MemoryService::add_cms_space(CompactibleFreeListSpace* space,
 231                                          const char* name,
 232                                          bool is_heap,
 233                                          size_t max_size,
 234                                          bool support_usage_threshold) {
 235   MemoryPool::PoolType type = (is_heap ? MemoryPool::Heap : MemoryPool::NonHeap);
 236   CompactibleFreeListSpacePool* pool = new CompactibleFreeListSpacePool(space, name, type, max_size, support_usage_threshold);
 237   _pools_list->append(pool);
 238   return (MemoryPool*) pool;
 239 }
 240 #endif // INCLUDE_ALL_GCS
 241 
 242 // Add memory pool(s) for one generation
 243 void MemoryService::add_generation_memory_pool(Generation* gen,
 244                                                MemoryManager* major_mgr,
 245                                                MemoryManager* minor_mgr) {
 246   guarantee(gen != NULL, "No generation for memory pool");
 247   Generation::Name kind = gen->kind();
 248   int index = _pools_list->length();
 249 
 250   switch (kind) {
 251     case Generation::DefNew: {
 252       assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers");
 253       DefNewGeneration* young_gen = (DefNewGeneration*) gen;
 254       // Add a memory pool for each space and young gen doesn't
 255       // support low memory detection as it is expected to get filled up.
 256       MemoryPool* eden = add_space(young_gen->eden(),
 257                                    "Eden Space",
 258                                    true, /* is_heap */
 259                                    young_gen->max_eden_size(),
 260                                    false /* support_usage_threshold */);
 261       MemoryPool* survivor = add_survivor_spaces(young_gen,
 262                                                  "Survivor Space",
 263                                                  true, /* is_heap */
 264                                                  young_gen->max_survivor_size(),
 265                                                  false /* support_usage_threshold */);
 266       break;
 267     }
 268 
 269 #if INCLUDE_ALL_GCS
 270     case Generation::ParNew:
 271     {
 272       assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers");
 273       // Add a memory pool for each space and young gen doesn't
 274       // support low memory detection as it is expected to get filled up.
 275       ParNewGeneration* parnew_gen = (ParNewGeneration*) gen;
 276       MemoryPool* eden = add_space(parnew_gen->eden(),
 277                                    "Par Eden Space",
 278                                    true /* is_heap */,
 279                                    parnew_gen->max_eden_size(),
 280                                    false /* support_usage_threshold */);
 281       MemoryPool* survivor = add_survivor_spaces(parnew_gen,
 282                                                  "Par Survivor Space",
 283                                                  true, /* is_heap */
 284                                                  parnew_gen->max_survivor_size(),
 285                                                  false /* support_usage_threshold */);
 286 
 287       break;
 288     }
 289 #endif // INCLUDE_ALL_GCS
 290 
 291     case Generation::MarkSweepCompact: {
 292       assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager");
 293       add_gen(gen,
 294               "Tenured Gen",
 295               true, /* is_heap */
 296               true  /* support_usage_threshold */);
 297       break;
 298     }
 299 
 300 #if INCLUDE_ALL_GCS
 301     case Generation::ConcurrentMarkSweep:
 302     {
 303       assert(major_mgr != NULL && minor_mgr == NULL, "Should have only one manager");
 304       ConcurrentMarkSweepGeneration* cms = (ConcurrentMarkSweepGeneration*) gen;
 305       MemoryPool* pool = add_cms_space(cms->cmsSpace(),
 306                                        "CMS Old Gen",
 307                                        true, /* is_heap */
 308                                        cms->reserved().byte_size(),
 309                                        true  /* support_usage_threshold */);
 310       break;
 311     }
 312 #endif // INCLUDE_ALL_GCS
 313 
 314     default:
 315       assert(false, "should not reach here");
 316       // no memory pool added for others
 317       break;
 318   }
 319 
 320   assert(major_mgr != NULL, "Should have at least one manager");
 321   // Link managers and the memory pools together
 322   for (int i = index; i < _pools_list->length(); i++) {
 323     MemoryPool* pool = _pools_list->at(i);
 324     major_mgr->add_pool(pool);
 325     if (minor_mgr != NULL) {
 326       minor_mgr->add_pool(pool);
 327     }
 328   }
 329 }
 330 
 331 
 332 #if INCLUDE_ALL_GCS
 333 void MemoryService::add_psYoung_memory_pool(PSYoungGen* gen, MemoryManager* major_mgr, MemoryManager* minor_mgr) {
 334   assert(major_mgr != NULL && minor_mgr != NULL, "Should have two managers");
 335 
 336   // Add a memory pool for each space and young gen doesn't
 337   // support low memory detection as it is expected to get filled up.
 338   EdenMutableSpacePool* eden = new EdenMutableSpacePool(gen,
 339                                                         gen->eden_space(),
 340                                                         "PS Eden Space",
 341                                                         MemoryPool::Heap,
 342                                                         false /* support_usage_threshold */);
 343 
 344   SurvivorMutableSpacePool* survivor = new SurvivorMutableSpacePool(gen,
 345                                                                     "PS Survivor Space",
 346                                                                     MemoryPool::Heap,
 347                                                                     false /* support_usage_threshold */);
 348 
 349   major_mgr->add_pool(eden);
 350   major_mgr->add_pool(survivor);
 351   minor_mgr->add_pool(eden);
 352   minor_mgr->add_pool(survivor);
 353   _pools_list->append(eden);
 354   _pools_list->append(survivor);
 355 }
 356 
 357 void MemoryService::add_psOld_memory_pool(PSOldGen* gen, MemoryManager* mgr) {
 358   PSGenerationPool* old_gen = new PSGenerationPool(gen,
 359                                                    "PS Old Gen",
 360                                                    MemoryPool::Heap,
 361                                                    true /* support_usage_threshold */);
 362   mgr->add_pool(old_gen);
 363   _pools_list->append(old_gen);
 364 }
 365 
 366 void MemoryService::add_g1YoungGen_memory_pool(G1CollectedHeap* g1h,
 367                                                MemoryManager* major_mgr,
 368                                                MemoryManager* minor_mgr) {
 369   assert(major_mgr != NULL && minor_mgr != NULL, "should have two managers");
 370 
 371   G1EdenPool* eden = new G1EdenPool(g1h);
 372   G1SurvivorPool* survivor = new G1SurvivorPool(g1h);
 373 
 374   major_mgr->add_pool(eden);
 375   major_mgr->add_pool(survivor);
 376   minor_mgr->add_pool(eden);
 377   minor_mgr->add_pool(survivor);
 378   _pools_list->append(eden);
 379   _pools_list->append(survivor);
 380 }
 381 
 382 void MemoryService::add_g1OldGen_memory_pool(G1CollectedHeap* g1h,
 383                                              MemoryManager* mgr) {
 384   assert(mgr != NULL, "should have one manager");
 385 
 386   G1OldGenPool* old_gen = new G1OldGenPool(g1h);
 387   mgr->add_pool(old_gen);
 388   _pools_list->append(old_gen);
 389 }
 390 #endif // INCLUDE_ALL_GCS
 391 
 392 void MemoryService::add_code_heap_memory_pool(CodeHeap* heap, const char* name) {
 393   // Create new memory pool for this heap
 394   MemoryPool* code_heap_pool = new CodeHeapPool(heap, name, true /* support_usage_threshold */);
 395 
 396   // Append to lists
 397   _code_heap_pools->append(code_heap_pool);
 398   _pools_list->append(code_heap_pool);
 399 
 400   if (_code_cache_manager == NULL) {
 401     // Create CodeCache memory manager
 402     _code_cache_manager = MemoryManager::get_code_cache_memory_manager();
 403     _managers_list->append(_code_cache_manager);
 404   }
 405 
 406   _code_cache_manager->add_pool(code_heap_pool);
 407 }
 408 
 409 void MemoryService::add_metaspace_memory_pools() {
 410   MemoryManager* mgr = MemoryManager::get_metaspace_memory_manager();
 411 
 412   _metaspace_pool = new MetaspacePool();
 413   mgr->add_pool(_metaspace_pool);
 414   _pools_list->append(_metaspace_pool);
 415 
 416   if (UseCompressedClassPointers) {
 417     _compressed_class_pool = new CompressedKlassSpacePool();
 418     mgr->add_pool(_compressed_class_pool);
 419     _pools_list->append(_compressed_class_pool);
 420   }
 421 
 422   _managers_list->append(mgr);
 423 }
 424 
 425 MemoryManager* MemoryService::get_memory_manager(instanceHandle mh) {
 426   for (int i = 0; i < _managers_list->length(); i++) {
 427     MemoryManager* mgr = _managers_list->at(i);
 428     if (mgr->is_manager(mh)) {
 429       return mgr;
 430     }
 431   }
 432   return NULL;
 433 }
 434 
 435 MemoryPool* MemoryService::get_memory_pool(instanceHandle ph) {
 436   for (int i = 0; i < _pools_list->length(); i++) {
 437     MemoryPool* pool = _pools_list->at(i);
 438     if (pool->is_pool(ph)) {
 439       return pool;
 440     }
 441   }
 442   return NULL;
 443 }
 444 
 445 void MemoryService::track_memory_usage() {
 446   // Track the peak memory usage
 447   for (int i = 0; i < _pools_list->length(); i++) {
 448     MemoryPool* pool = _pools_list->at(i);
 449     pool->record_peak_memory_usage();
 450   }
 451 
 452   // Detect low memory
 453   LowMemoryDetector::detect_low_memory();
 454 }
 455 
 456 void MemoryService::track_memory_pool_usage(MemoryPool* pool) {
 457   // Track the peak memory usage
 458   pool->record_peak_memory_usage();
 459 
 460   // Detect low memory
 461   if (LowMemoryDetector::is_enabled(pool)) {
 462     LowMemoryDetector::detect_low_memory(pool);
 463   }
 464 }
 465 
 466 void MemoryService::gc_begin(bool fullGC, bool recordGCBeginTime,
 467                              bool recordAccumulatedGCTime,
 468                              bool recordPreGCUsage, bool recordPeakUsage) {
 469 
 470   GCMemoryManager* mgr;
 471   if (fullGC) {
 472     mgr = _major_gc_manager;
 473   } else {
 474     mgr = _minor_gc_manager;
 475   }
 476   assert(mgr->is_gc_memory_manager(), "Sanity check");
 477   mgr->gc_begin(recordGCBeginTime, recordPreGCUsage, recordAccumulatedGCTime);
 478 
 479   // Track the peak memory usage when GC begins
 480   if (recordPeakUsage) {
 481     for (int i = 0; i < _pools_list->length(); i++) {
 482       MemoryPool* pool = _pools_list->at(i);
 483       pool->record_peak_memory_usage();
 484     }
 485   }
 486 }
 487 
 488 void MemoryService::gc_end(bool fullGC, bool recordPostGCUsage,
 489                            bool recordAccumulatedGCTime,
 490                            bool recordGCEndTime, bool countCollection,
 491                            GCCause::Cause cause) {
 492 
 493   GCMemoryManager* mgr;
 494   if (fullGC) {
 495     mgr = (GCMemoryManager*) _major_gc_manager;
 496   } else {
 497     mgr = (GCMemoryManager*) _minor_gc_manager;
 498   }
 499   assert(mgr->is_gc_memory_manager(), "Sanity check");
 500 
 501   // register the GC end statistics and memory usage
 502   mgr->gc_end(recordPostGCUsage, recordAccumulatedGCTime, recordGCEndTime,
 503               countCollection, cause);
 504 }
 505 
 506 void MemoryService::oops_do(OopClosure* f) {
 507   int i;
 508 
 509   for (i = 0; i < _pools_list->length(); i++) {
 510     MemoryPool* pool = _pools_list->at(i);
 511     pool->oops_do(f);
 512   }
 513   for (i = 0; i < _managers_list->length(); i++) {
 514     MemoryManager* mgr = _managers_list->at(i);
 515     mgr->oops_do(f);
 516   }
 517 }
 518 
 519 bool MemoryService::set_verbose(bool verbose) {
 520   MutexLocker m(Management_lock);
 521   // verbose will be set to the previous value
 522   bool succeed = CommandLineFlags::boolAtPut((char*)"PrintGC", &verbose, Flag::MANAGEMENT);
 523   assert(succeed, "Setting PrintGC flag fails");
 524   ClassLoadingService::reset_trace_class_unloading();
 525 
 526   return verbose;
 527 }
 528 
 529 Handle MemoryService::create_MemoryUsage_obj(MemoryUsage usage, TRAPS) {
 530   Klass* k = Management::java_lang_management_MemoryUsage_klass(CHECK_NH);
 531   instanceKlassHandle ik(THREAD, k);
 532 
 533   instanceHandle obj = ik->allocate_instance_handle(CHECK_NH);
 534 
 535   JavaValue result(T_VOID);
 536   JavaCallArguments args(10);
 537   args.push_oop(obj);                         // receiver
 538   args.push_long(usage.init_size_as_jlong()); // Argument 1
 539   args.push_long(usage.used_as_jlong());      // Argument 2
 540   args.push_long(usage.committed_as_jlong()); // Argument 3
 541   args.push_long(usage.max_size_as_jlong());  // Argument 4
 542 
 543   JavaCalls::call_special(&result,
 544                           ik,
 545                           vmSymbols::object_initializer_name(),
 546                           vmSymbols::long_long_long_long_void_signature(),
 547                           &args,
 548                           CHECK_NH);
 549   return obj;
 550 }
 551 //
 552 // GC manager type depends on the type of Generation. Depending on the space
 553 // availablity and vm options the gc uses major gc manager or minor gc
 554 // manager or both. The type of gc manager depends on the generation kind.
 555 // For DefNew and ParNew generation doing scavenge gc uses minor gc manager (so
 556 // _fullGC is set to false ) and for other generation kinds doing
 557 // mark-sweep-compact uses major gc manager (so _fullGC is set to true).
 558 TraceMemoryManagerStats::TraceMemoryManagerStats(Generation::Name kind, GCCause::Cause cause) {
 559   switch (kind) {
 560     case Generation::DefNew:
 561 #if INCLUDE_ALL_GCS
 562     case Generation::ParNew:
 563 #endif // INCLUDE_ALL_GCS
 564       _fullGC=false;
 565       break;
 566     case Generation::MarkSweepCompact:
 567 #if INCLUDE_ALL_GCS
 568     case Generation::ConcurrentMarkSweep:
 569 #endif // INCLUDE_ALL_GCS
 570       _fullGC=true;
 571       break;
 572     default:
 573       assert(false, "Unrecognized gc generation kind.");
 574   }
 575   // this has to be called in a stop the world pause and represent
 576   // an entire gc pause, start to finish:
 577   initialize(_fullGC, cause,true, true, true, true, true, true, true);
 578 }
 579 TraceMemoryManagerStats::TraceMemoryManagerStats(bool fullGC,
 580                                                  GCCause::Cause cause,
 581                                                  bool recordGCBeginTime,
 582                                                  bool recordPreGCUsage,
 583                                                  bool recordPeakUsage,
 584                                                  bool recordPostGCUsage,
 585                                                  bool recordAccumulatedGCTime,
 586                                                  bool recordGCEndTime,
 587                                                  bool countCollection) {
 588     initialize(fullGC, cause, recordGCBeginTime, recordPreGCUsage, recordPeakUsage,
 589              recordPostGCUsage, recordAccumulatedGCTime, recordGCEndTime,
 590              countCollection);
 591 }
 592 
 593 // for a subclass to create then initialize an instance before invoking
 594 // the MemoryService
 595 void TraceMemoryManagerStats::initialize(bool fullGC,
 596                                          GCCause::Cause cause,
 597                                          bool recordGCBeginTime,
 598                                          bool recordPreGCUsage,
 599                                          bool recordPeakUsage,
 600                                          bool recordPostGCUsage,
 601                                          bool recordAccumulatedGCTime,
 602                                          bool recordGCEndTime,
 603                                          bool countCollection) {
 604   _fullGC = fullGC;
 605   _recordGCBeginTime = recordGCBeginTime;
 606   _recordPreGCUsage = recordPreGCUsage;
 607   _recordPeakUsage = recordPeakUsage;
 608   _recordPostGCUsage = recordPostGCUsage;
 609   _recordAccumulatedGCTime = recordAccumulatedGCTime;
 610   _recordGCEndTime = recordGCEndTime;
 611   _countCollection = countCollection;
 612   _cause = cause;
 613 
 614   MemoryService::gc_begin(_fullGC, _recordGCBeginTime, _recordAccumulatedGCTime,
 615                           _recordPreGCUsage, _recordPeakUsage);
 616 }
 617 
 618 TraceMemoryManagerStats::~TraceMemoryManagerStats() {
 619   MemoryService::gc_end(_fullGC, _recordPostGCUsage, _recordAccumulatedGCTime,
 620                         _recordGCEndTime, _countCollection, _cause);
 621 }