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src/hotspot/share/gc/g1/g1MonitoringSupport.cpp

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  67 
  68 class G1OldGenerationCounters : public G1GenerationCounters {
  69 public:
  70   G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size)
  71   : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */,
  72                          G1MonitoringSupport::pad_capacity(0) /* min_capacity */,
  73                          G1MonitoringSupport::pad_capacity(max_size),
  74                          G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) {
  75     if (UsePerfData) {
  76       update_all();
  77     }
  78   }
  79 
  80   virtual void update_all() {
  81     size_t committed =
  82               G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed());
  83     _current_size->set_value(committed);
  84   }
  85 };
  86 










  87 G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) :
  88   _g1h(g1h),



  89   _incremental_memory_manager("G1 Young Generation", "end of minor GC"),
  90   _full_gc_memory_manager("G1 Old Generation", "end of major GC"),



  91   _eden_space_pool(NULL),
  92   _survivor_space_pool(NULL),
  93   _old_gen_pool(NULL),



  94   _incremental_collection_counters(NULL),
  95   _full_collection_counters(NULL),
  96   _conc_collection_counters(NULL),
  97   _young_gen_counters(NULL),
  98   _old_gen_counters(NULL),
  99   _old_space_counters(NULL),
 100   _eden_space_counters(NULL),
 101   _from_space_counters(NULL),
 102   _to_space_counters(NULL),
 103 
 104   _overall_committed(0),
 105   _overall_used(0),




 106   _young_gen_committed(0),
 107   _old_gen_committed(0),




 108 
 109   _eden_space_committed(0),
 110   _eden_space_used(0),
 111   _survivor_space_committed(0),
 112   _survivor_space_used(0),
 113   _old_gen_used(0) {
 114 


 115   recalculate_sizes();
 116 
 117   // Counters for garbage collections
 118   //
 119   //  name "collector.0".  In a generational collector this would be the
 120   // young generation collection.
 121   _incremental_collection_counters =
 122     new CollectorCounters("G1 incremental collections", 0);
 123   //   name "collector.1".  In a generational collector this would be the
 124   // old generation collection.
 125   _full_collection_counters =
 126     new CollectorCounters("G1 stop-the-world full collections", 1);
 127   //   name "collector.2".  In a generational collector this would be the
 128   // STW phases in concurrent collection.
 129   _conc_collection_counters =
 130     new CollectorCounters("G1 stop-the-world phases", 2);
 131 
 132   // "Generation" and "Space" counters.
 133   //
 134   //  name "generation.1" This is logically the old generation in
 135   // generational GC terms.  The "1, 1" parameters are for
 136   // the n-th generation (=1) with 1 space.
 137   // Counters are created from minCapacity, maxCapacity, and capacity
 138   _old_gen_counters = new G1OldGenerationCounters(this, "old", _g1h->max_capacity());
 139 
 140   //  name  "generation.1.space.0"
 141   // Counters are created from maxCapacity, capacity, initCapacity,
 142   // and used.
 143   _old_space_counters = new HSpaceCounters(_old_gen_counters->name_space(),
 144     "space", 0 /* ordinal */,
 145     pad_capacity(g1h->max_capacity()) /* max_capacity */,
 146     pad_capacity(_old_gen_committed) /* init_capacity */);
 147 
 148   //   Young collection set
 149   //  name "generation.0".  This is logically the young generation.
 150   //  The "0, 3" are parameters for the n-th generation (=0) with 3 spaces.
 151   // See  _old_collection_counters for additional counters
 152   _young_gen_counters = new G1YoungGenerationCounters(this, "young", _g1h->max_capacity());
 153 
 154   const char* young_collection_name_space = _young_gen_counters->name_space();
 155 
 156   //  name "generation.0.space.0"
 157   // See _old_space_counters for additional counters
 158   _eden_space_counters = new HSpaceCounters(young_collection_name_space,
 159     "eden", 0 /* ordinal */,
 160     pad_capacity(g1h->max_capacity()) /* max_capacity */,
 161     pad_capacity(_eden_space_committed) /* init_capacity */);
 162 
 163   //  name "generation.0.space.1"
 164   // See _old_space_counters for additional counters
 165   // Set the arguments to indicate that this survivor space is not used.
 166   _from_space_counters = new HSpaceCounters(young_collection_name_space,


 168     pad_capacity(0) /* max_capacity */,
 169     pad_capacity(0) /* init_capacity */);
 170   // Given that this survivor space is not used, we update it here
 171   // once to reflect that its used space is 0 so that we don't have to
 172   // worry about updating it again later.
 173   if (UsePerfData) {
 174     _from_space_counters->update_used(0);
 175   }
 176 
 177   //  name "generation.0.space.2"
 178   // See _old_space_counters for additional counters
 179   _to_space_counters = new HSpaceCounters(young_collection_name_space,
 180     "s1", 2 /* ordinal */,
 181     pad_capacity(g1h->max_capacity()) /* max_capacity */,
 182     pad_capacity(_survivor_space_committed) /* init_capacity */);
 183 }
 184 
 185 G1MonitoringSupport::~G1MonitoringSupport() {
 186   delete _eden_space_pool;
 187   delete _survivor_space_pool;
 188   delete _old_gen_pool;


 189 }
 190 
 191 void G1MonitoringSupport::initialize_serviceability() {
 192   _eden_space_pool = new G1EdenPool(_g1h, _eden_space_committed);
 193   _survivor_space_pool = new G1SurvivorPool(_g1h, _survivor_space_committed);
 194   _old_gen_pool = new G1OldGenPool(_g1h, _old_gen_committed, _g1h->max_capacity());


 195 
 196   _full_gc_memory_manager.add_pool(_eden_space_pool);
 197   _full_gc_memory_manager.add_pool(_survivor_space_pool);
 198   _full_gc_memory_manager.add_pool(_old_gen_pool);
 199 

 200   _incremental_memory_manager.add_pool(_eden_space_pool);
 201   _incremental_memory_manager.add_pool(_survivor_space_pool);
 202   _incremental_memory_manager.add_pool(_old_gen_pool, false /* always_affected_by_gc */);
 203 }










 204 
 205 MemoryUsage G1MonitoringSupport::memory_usage() {
 206   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 207   return MemoryUsage(InitialHeapSize, _overall_used, _overall_committed, _g1h->max_capacity());











 208 }
 209 
 210 GrowableArray<GCMemoryManager*> G1MonitoringSupport::memory_managers() {
 211   GrowableArray<GCMemoryManager*> memory_managers(2);

 212   memory_managers.append(&_incremental_memory_manager);
 213   memory_managers.append(&_full_gc_memory_manager);





 214   return memory_managers;
 215 }
 216 
 217 GrowableArray<MemoryPool*> G1MonitoringSupport::memory_pools() {
 218   GrowableArray<MemoryPool*> memory_pools(3);
 219   memory_pools.append(_eden_space_pool);
 220   memory_pools.append(_survivor_space_pool);
 221   memory_pools.append(_old_gen_pool);




 222   return memory_pools;
 223 }
 224 
 225 void G1MonitoringSupport::recalculate_sizes() {
 226   assert_heap_locked_or_at_safepoint(true);
 227 
 228   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 229   // Recalculate all the sizes from scratch.
 230 
 231   uint young_list_length = _g1h->young_regions_count();
 232   uint survivor_list_length = _g1h->survivor_regions_count();
 233   assert(young_list_length >= survivor_list_length, "invariant");
 234   uint eden_list_length = young_list_length - survivor_list_length;






 235   // Max length includes any potential extensions to the young gen
 236   // we'll do when the GC locker is active.
 237   uint young_list_max_length = _g1h->g1_policy()->young_list_max_length();
 238   assert(young_list_max_length >= survivor_list_length, "invariant");
 239   uint eden_list_max_length = young_list_max_length - survivor_list_length;
 240 
 241   _overall_used = _g1h->used_unlocked();
 242   _eden_space_used = (size_t) eden_list_length * HeapRegion::GrainBytes;
 243   _survivor_space_used = (size_t) survivor_list_length * HeapRegion::GrainBytes;
 244   _old_gen_used = subtract_up_to_zero(_overall_used, _eden_space_used + _survivor_space_used);











 245 
 246   // First calculate the committed sizes that can be calculated independently.
 247   _survivor_space_committed = _survivor_space_used;
 248   _old_gen_committed = HeapRegion::align_up_to_region_byte_size(_old_gen_used);


 249 
 250   // Next, start with the overall committed size.
 251   _overall_committed = _g1h->capacity();
 252   size_t committed = _overall_committed;
 253 
 254   // Remove the committed size we have calculated so far (for the
 255   // survivor and old space).
 256   assert(committed >= (_survivor_space_committed + _old_gen_committed), "sanity");
 257   committed -= _survivor_space_committed + _old_gen_committed;
 258 
 259   // Next, calculate and remove the committed size for the eden.
 260   _eden_space_committed = (size_t) eden_list_max_length * HeapRegion::GrainBytes;
 261   // Somewhat defensive: be robust in case there are inaccuracies in
 262   // the calculations
 263   _eden_space_committed = MIN2(_eden_space_committed, committed);
 264   committed -= _eden_space_committed;
 265 
 266   // Finally, give the rest to the old space...
 267   _old_gen_committed += committed;
 268   // ..and calculate the young gen committed.
 269   _young_gen_committed = _eden_space_committed + _survivor_space_committed;
 270 
 271   assert(_overall_committed ==
 272          (_eden_space_committed + _survivor_space_committed + _old_gen_committed),
 273          "the committed sizes should add up");
 274   // Somewhat defensive: cap the eden used size to make sure it
 275   // never exceeds the committed size.
 276   _eden_space_used = MIN2(_eden_space_used, _eden_space_committed);
 277   // _survivor_committed and _old_committed are calculated in terms of
 278   // the corresponding _*_used value, so the next two conditions
 279   // should hold.
 280   assert(_survivor_space_used <= _survivor_space_committed, "post-condition");
 281   assert(_old_gen_used <= _old_gen_committed, "post-condition");
 282 }
 283 
 284 void G1MonitoringSupport::update_sizes() {
 285   recalculate_sizes();
 286   if (UsePerfData) {
 287     _eden_space_counters->update_capacity(pad_capacity(_eden_space_committed));
 288     _eden_space_counters->update_used(_eden_space_used);
 289    // only the "to" survivor space is active, so we don't need to
 290     // update the counters for the "from" survivor space
 291     _to_space_counters->update_capacity(pad_capacity(_survivor_space_committed));
 292     _to_space_counters->update_used(_survivor_space_used);
 293     _old_space_counters->update_capacity(pad_capacity(_old_gen_committed));
 294     _old_space_counters->update_used(_old_gen_used);
 295 
 296     _young_gen_counters->update_all();
 297     _old_gen_counters->update_all();
 298 
 299     MetaspaceCounters::update_performance_counters();
 300     CompressedClassSpaceCounters::update_performance_counters();
 301   }
 302 }
 303 
 304 void G1MonitoringSupport::update_eden_size() {
 305   // Recalculate everything - this should be fast enough and we are sure that we do not
 306   // miss anything.
 307   recalculate_sizes();
 308   if (UsePerfData) {
 309     _eden_space_counters->update_used(_eden_space_used);

 310   }
 311 }
 312 
 313 MemoryUsage G1MonitoringSupport::eden_space_memory_usage(size_t initial_size, size_t max_size) {
 314   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);


 315 
 316   return MemoryUsage(initial_size,
 317                      _eden_space_used,
 318                      _eden_space_committed,
 319                      max_size);
 320 }
 321 
 322 MemoryUsage G1MonitoringSupport::survivor_space_memory_usage(size_t initial_size, size_t max_size) {
 323   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);


 324 
 325   return MemoryUsage(initial_size,
 326                      _survivor_space_used,
 327                      _survivor_space_committed,
 328                      max_size);
 329 }
 330 
 331 MemoryUsage G1MonitoringSupport::old_gen_memory_usage(size_t initial_size, size_t max_size) {
 332   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);


 333 
 334   return MemoryUsage(initial_size,
 335                      _old_gen_used,
 336                      _old_gen_committed,
 337                      max_size);














































 338 }
 339 
 340 G1MonitoringScope::G1MonitoringScope(G1MonitoringSupport* g1mm, bool full_gc, bool all_memory_pools_affected) :
 341   _tcs(full_gc ? g1mm->_full_collection_counters : g1mm->_incremental_collection_counters),
 342   _tms(full_gc ? &g1mm->_full_gc_memory_manager : &g1mm->_incremental_memory_manager,
 343        G1CollectedHeap::heap()->gc_cause(), all_memory_pools_affected) {



 344 }


  67 
  68 class G1OldGenerationCounters : public G1GenerationCounters {
  69 public:
  70   G1OldGenerationCounters(G1MonitoringSupport* g1mm, const char* name, size_t max_size)
  71   : G1GenerationCounters(g1mm, name, 1 /* ordinal */, 1 /* spaces */,
  72                          G1MonitoringSupport::pad_capacity(0) /* min_capacity */,
  73                          G1MonitoringSupport::pad_capacity(max_size),
  74                          G1MonitoringSupport::pad_capacity(0) /* curr_capacity */) {
  75     if (UsePerfData) {
  76       update_all();
  77     }
  78   }
  79 
  80   virtual void update_all() {
  81     size_t committed =
  82       G1MonitoringSupport::pad_capacity(_g1mm->old_gen_committed());
  83     _current_size->set_value(committed);
  84   }
  85 };
  86 
  87 size_t G1MonitoringSupport::old_gen_committed() {
  88   return _old_space_committed +
  89     (use_legacy_monitoring() ? 0 : _humongous_space_committed + _archive_space_committed);
  90 }
  91 
  92 size_t G1MonitoringSupport::old_gen_used() {
  93   return old_space_used() +
  94     (use_legacy_monitoring() ? 0 : humongous_space_used() + archive_space_used());
  95 }
  96 
  97 G1MonitoringSupport::G1MonitoringSupport(G1CollectedHeap* g1h) :
  98   _g1h(g1h),
  99   _use_legacy_monitoring(G1UseLegacyMonitoring),
 100 
 101   _full_memory_manager(G1UseLegacyMonitoring ? "G1 Old Generation" : "G1 Full", "end of major GC"),
 102   _incremental_memory_manager("G1 Young Generation", "end of minor GC"),
 103   _young_memory_manager("G1 Young", "end of young GC"),
 104   _mixed_memory_manager("G1 Mixed", "end of mixed GC"),
 105   _conc_memory_manager("G1 Concurrent Cycle", "end of concurrent cycle"),
 106 
 107   _eden_space_pool(NULL),
 108   _survivor_space_pool(NULL),
 109   _old_space_pool(NULL),
 110   _archive_space_pool(NULL),
 111   _humongous_space_pool(NULL),
 112 
 113   _incremental_collection_counters(NULL),
 114   _full_collection_counters(NULL),
 115   _conc_collection_counters(NULL),






 116 
 117   _young_gen_counters(NULL),     _old_gen_counters(NULL),
 118 
 119   _old_space_counters(NULL),     _eden_space_counters(NULL),
 120   _from_space_counters(NULL),    _to_space_counters(NULL),
 121 
 122   _overall_committed(0),         _overall_used(0),
 123   _young_gen_committed(0),
 124   _eden_space_committed(0),      _eden_space_used(0),
 125   _survivor_space_committed(0),  _survivor_space_used(0),
 126   _old_space_committed(0),       _old_space_used(0),
 127   _archive_space_committed(0),   _archive_space_used(0),
 128   _humongous_space_committed(0), _humongous_space_used(0) {
 129 
 130   // Counters for garbage collections.




 131 
 132   // Compute initial capacities. Somewhat random, as they depend
 133   // on what's happened so far during JVM initialization.
 134   recalculate_sizes();
 135 


 136   //  name "collector.0".  In a generational collector this would be the
 137   // young generation collection.
 138   _incremental_collection_counters =
 139     new CollectorCounters("G1 incremental collections", 0);
 140   //   name "collector.1".  In a generational collector this would be the
 141   // old generation collection.
 142   _full_collection_counters =
 143     new CollectorCounters("G1 stop-the-world full collections", 1);
 144   //   name "collector.2".  In a generational collector this would be the
 145   // STW phases in concurrent collection.
 146   _conc_collection_counters =
 147     new CollectorCounters("G1 stop-the-world phases", 2);
 148 
 149   // "Generation" and "Space" counters.
 150   //
 151   //  name "generation.1" This is logically the old generation in
 152   // generational GC terms.  The "1, 1" parameters are for
 153   // the n-th generation (=1) with 1 space.
 154   // Counters are created from minCapacity, maxCapacity, and capacity
 155   _old_gen_counters = new G1OldGenerationCounters(this, "old", _g1h->max_capacity());
 156 
 157   //  name  "generation.1.space.0"
 158   // Counters are created from maxCapacity, capacity, initCapacity,
 159   // and used.
 160   _old_space_counters = new HSpaceCounters(_old_gen_counters->name_space(),
 161     "space", 0 /* ordinal */,
 162     pad_capacity(g1h->max_capacity()) /* max_capacity */,
 163     pad_capacity(old_gen_committed()) /* init_capacity */);
 164 
 165   //   Young collection set
 166   //  name "generation.0".  This is logically the young generation.
 167   //  The "0, 3" are parameters for the n-th generation (=0) with 3 spaces.
 168   // See  _old_collection_counters for additional counters
 169   _young_gen_counters = new G1YoungGenerationCounters(this, "young", _g1h->max_capacity());
 170 
 171   const char* young_collection_name_space = _young_gen_counters->name_space();
 172 
 173   //  name "generation.0.space.0"
 174   // See _old_space_counters for additional counters
 175   _eden_space_counters = new HSpaceCounters(young_collection_name_space,
 176     "eden", 0 /* ordinal */,
 177     pad_capacity(g1h->max_capacity()) /* max_capacity */,
 178     pad_capacity(_eden_space_committed) /* init_capacity */);
 179 
 180   //  name "generation.0.space.1"
 181   // See _old_space_counters for additional counters
 182   // Set the arguments to indicate that this survivor space is not used.
 183   _from_space_counters = new HSpaceCounters(young_collection_name_space,


 185     pad_capacity(0) /* max_capacity */,
 186     pad_capacity(0) /* init_capacity */);
 187   // Given that this survivor space is not used, we update it here
 188   // once to reflect that its used space is 0 so that we don't have to
 189   // worry about updating it again later.
 190   if (UsePerfData) {
 191     _from_space_counters->update_used(0);
 192   }
 193 
 194   //  name "generation.0.space.2"
 195   // See _old_space_counters for additional counters
 196   _to_space_counters = new HSpaceCounters(young_collection_name_space,
 197     "s1", 2 /* ordinal */,
 198     pad_capacity(g1h->max_capacity()) /* max_capacity */,
 199     pad_capacity(_survivor_space_committed) /* init_capacity */);
 200 }
 201 
 202 G1MonitoringSupport::~G1MonitoringSupport() {
 203   delete _eden_space_pool;
 204   delete _survivor_space_pool;
 205   delete _old_space_pool;
 206   delete _archive_space_pool;
 207   delete _humongous_space_pool;
 208 }
 209 
 210 void G1MonitoringSupport::initialize_serviceability() {
 211   _eden_space_pool = new G1EdenPool(_g1h, _eden_space_committed);
 212   _survivor_space_pool = new G1SurvivorPool(_g1h, _survivor_space_committed);
 213   _old_space_pool = new G1OldPool(_g1h, _old_space_committed, _g1h->max_capacity());
 214   _archive_space_pool = new G1ArchivePool(_g1h, _archive_space_committed);
 215   _humongous_space_pool = new G1HumongousPool(_g1h, _humongous_space_committed);
 216 
 217   // Pools must be added to each memory manager in the order specified
 218   // below: TestMemoryMXBeansAndPoolsPresence.java expects them so.

 219 
 220   if (use_legacy_monitoring()) {
 221     _incremental_memory_manager.add_pool(_eden_space_pool);
 222     _incremental_memory_manager.add_pool(_survivor_space_pool);
 223     // Incremental GCs can affect the humongous pool, but legacy behavior ignores it.
 224     //  _incremental_memory_manager.add_pool(_humongous_space_pool);
 225     _incremental_memory_manager.add_pool(_old_space_pool, false /* always_affected_by_gc */);
 226   } else {
 227     _young_memory_manager.add_pool(_eden_space_pool);
 228     _young_memory_manager.add_pool(_survivor_space_pool);
 229     _young_memory_manager.add_pool(_humongous_space_pool);
 230 
 231     _mixed_memory_manager.add_pool(_eden_space_pool);
 232     _mixed_memory_manager.add_pool(_survivor_space_pool);
 233     _mixed_memory_manager.add_pool(_humongous_space_pool);
 234     _mixed_memory_manager.add_pool(_old_space_pool);
 235 
 236     _conc_memory_manager.add_pool(_humongous_space_pool);
 237     _conc_memory_manager.add_pool(_old_space_pool);
 238   }
 239 
 240   _full_memory_manager.add_pool(_eden_space_pool);
 241   _full_memory_manager.add_pool(_survivor_space_pool);
 242   if (!use_legacy_monitoring()) {
 243     _full_memory_manager.add_pool(_humongous_space_pool);
 244     _full_memory_manager.add_pool(_archive_space_pool);
 245   }
 246   _full_memory_manager.add_pool(_old_space_pool);
 247 
 248   // Update pool and jstat counter content
 249   update_sizes();
 250 }
 251 
 252 GrowableArray<GCMemoryManager*> G1MonitoringSupport::memory_managers() {
 253   GrowableArray<GCMemoryManager*> memory_managers(4);
 254   if (use_legacy_monitoring()) {
 255     memory_managers.append(&_incremental_memory_manager);
 256   } else {
 257     memory_managers.append(&_young_memory_manager);
 258     memory_managers.append(&_mixed_memory_manager);
 259     memory_managers.append(&_conc_memory_manager);
 260   }
 261   memory_managers.append(&_full_memory_manager);
 262   return memory_managers;
 263 }
 264 
 265 GrowableArray<MemoryPool*> G1MonitoringSupport::memory_pools() {
 266   GrowableArray<MemoryPool*> memory_pools(5);
 267   memory_pools.append(_eden_space_pool);
 268   memory_pools.append(_survivor_space_pool);
 269   memory_pools.append(_old_space_pool);
 270   if (!use_legacy_monitoring()) {
 271     memory_pools.append(_humongous_space_pool);
 272     memory_pools.append(_archive_space_pool);
 273   }
 274   return memory_pools;
 275 }
 276 
 277 void G1MonitoringSupport::recalculate_sizes() {
 278   assert_heap_locked_or_at_safepoint(true);
 279 
 280   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);

 281 
 282   // Recalculate all sizes from scratch.
 283 
 284   uint eden_regions_count = _g1h->eden_regions_count();
 285   uint survivor_regions_count = _g1h->survivor_regions_count();
 286   uint young_regions_count = _g1h->young_regions_count();
 287   assert(young_regions_count == eden_regions_count + survivor_regions_count, "invariant");
 288   uint old_regions_count = _g1h->old_regions_count();
 289   uint archive_regions_count = _g1h->archive_regions_count();
 290   uint humongous_regions_count = _g1h->humongous_regions_count();
 291 
 292   // Max length includes any potential extensions to the young gen
 293   // we'll do when the GC locker is active.
 294   uint young_regions_count_max = _g1h->g1_policy()->young_list_max_length();
 295   assert(young_regions_count_max >= survivor_regions_count, "invariant");
 296   uint eden_regions_count_max = young_regions_count_max - survivor_regions_count;
 297 
 298   _overall_used = _g1h->used_unlocked();
 299   _eden_space_used = (size_t)eden_regions_count * HeapRegion::GrainBytes;
 300   _survivor_space_used = (size_t)survivor_regions_count * HeapRegion::GrainBytes;
 301   _archive_space_used = (size_t)archive_regions_count * HeapRegion::GrainBytes;
 302   _humongous_space_used = (size_t)humongous_regions_count * HeapRegion::GrainBytes;
 303  
 304   // We separately keep track of the humongous and archive spaces, no
 305   // matter which mode we're in. In legacy mode, the old space is the
 306   // sum of the old, humongous and archive spaces, but in default mode
 307   // it does not include the humongous and archive spaces. The old
 308   // generation as a whole (in contrast to the old space), always
 309   // includes the humongous and archive spaces. See the definitions of
 310   // old_gen_committed() and old_gen_used().
 311   size_t excess_old = use_legacy_monitoring() ? 0 : _humongous_space_used + _archive_space_used;
 312   _old_space_used = subtract_up_to_zero(_overall_used, _eden_space_used + _survivor_space_used + excess_old);
 313 
 314   // First, calculate the committed sizes that can be calculated independently.
 315   _survivor_space_committed = _survivor_space_used;
 316   _old_space_committed = HeapRegion::align_up_to_region_byte_size(_old_space_used);
 317   _archive_space_committed = _archive_space_used;
 318   _humongous_space_committed = _humongous_space_used;
 319  
 320   // Next, start with the overall committed size.
 321   size_t committed = _overall_committed = _g1h->capacity();

 322 
 323   // Remove the committed size we have calculated so far (for the
 324   // survivor, old, archive, and humongous spaces).
 325   assert(committed >= (_survivor_space_committed + _old_space_committed + excess_old), "sanity");
 326   committed -= _survivor_space_committed + _old_space_committed + excess_old;
 327  
 328   // Next, calculate and remove the committed size for the eden.
 329   _eden_space_committed = (size_t)eden_regions_count_max * HeapRegion::GrainBytes;
 330   // Somewhat defensive: be robust in case there are inaccuracies in
 331   // the calculations
 332   _eden_space_committed = MIN2(_eden_space_committed, committed);
 333   committed -= _eden_space_committed;
 334 
 335   // Finally, give the rest to the old space...
 336   _old_space_committed += committed;
 337   // ..and calculate the young gen committed.
 338   _young_gen_committed = _eden_space_committed + _survivor_space_committed;
 339 
 340   assert(_overall_committed ==
 341          (_eden_space_committed + _survivor_space_committed + _old_space_committed + excess_old),
 342          "the committed sizes should add up");
 343   // Somewhat defensive: cap the eden used size to make sure it
 344   // never exceeds the committed size.
 345   _eden_space_used = MIN2(_eden_space_used, _eden_space_committed);
 346 
 347   // _survivor_space_committed and _old_space_committed are calculated in terms of
 348   // the corresponding _*_used value, so the next two conditions should hold.
 349   assert(_survivor_space_used <= _survivor_space_committed, "post-condition");
 350   assert(_old_space_used <= _old_space_committed, "post-condition");
 351 }
 352 
 353 void G1MonitoringSupport::update_sizes() {
 354   recalculate_sizes();
 355   if (UsePerfData) {
 356     _eden_space_counters->update_capacity(pad_capacity(_eden_space_committed));
 357     _eden_space_counters->update_used(eden_space_used());
 358     // only the "to" survivor space is active, so we don't need to
 359     // update the counters for the "from" survivor space
 360     _to_space_counters->update_capacity(pad_capacity(_survivor_space_committed));
 361     _to_space_counters->update_used(survivor_space_used());
 362     _old_space_counters->update_capacity(pad_capacity(old_gen_committed()));
 363     _old_space_counters->update_used(old_gen_used());
 364 
 365     _young_gen_counters->update_all();
 366     _old_gen_counters->update_all();
 367 
 368     MetaspaceCounters::update_performance_counters();
 369     CompressedClassSpaceCounters::update_performance_counters();
 370   }
 371 }
 372 
 373 void G1MonitoringSupport::update_eden_size() {
 374   // Recalculate everything. Should be fast enough and we are sure not to miss anything.

 375   recalculate_sizes();
 376   if (UsePerfData) {
 377     _eden_space_counters->update_capacity(pad_capacity(_eden_space_committed));
 378     _eden_space_counters->update_used(eden_space_used());
 379   }
 380 }
 381 
 382 MemoryUsage G1MonitoringSupport::memory_usage() {
 383   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 384   return MemoryUsage(InitialHeapSize, _overall_used, _overall_committed, _g1h->max_capacity());
 385 }
 386 
 387 MemoryUsage G1MonitoringSupport::eden_space_memory_usage(size_t initial_size, size_t max_size) {
 388   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 389   return MemoryUsage(initial_size, eden_space_used(), _eden_space_committed, max_size);

 390 }
 391 
 392 MemoryUsage G1MonitoringSupport::survivor_space_memory_usage(size_t initial_size, size_t max_size) {
 393   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 394   return MemoryUsage(initial_size, survivor_space_used(), _survivor_space_committed, max_size);
 395 }
 396 
 397 MemoryUsage G1MonitoringSupport::old_space_memory_usage(size_t initial_size, size_t max_size) {
 398   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 399   return MemoryUsage(initial_size, old_space_used(), _old_space_committed, max_size);

 400 }
 401 
 402 MemoryUsage G1MonitoringSupport::archive_space_memory_usage(size_t initial_size, size_t max_size) {
 403   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 404   return MemoryUsage(initial_size, archive_space_used(), _archive_space_committed, max_size);
 405 }
 406 
 407 MemoryUsage G1MonitoringSupport::humongous_space_memory_usage(size_t initial_size, size_t max_size) {
 408   MutexLockerEx x(MonitoringSupport_lock, Mutex::_no_safepoint_check_flag);
 409   return MemoryUsage(initial_size, humongous_space_used(), _humongous_space_committed, max_size);
 410 }
 411 
 412 TraceConcMemoryManagerStats::TraceConcMemoryManagerStats(Stage stage, GCCause::Cause cause)
 413   : TraceMemoryManagerStats() {
 414   GCMemoryManager* manager = G1CollectedHeap::heap()->g1mm()->conc_memory_manager();
 415   switch (stage) {
 416     case CycleStart:
 417       initialize(manager /* GC manager */,
 418                  cause   /* cause of the GC */,
 419                  true    /* allMemoryPoolsAffected */,
 420                  true    /* recordGCBeginTime */,
 421                  true    /* recordPreGCUsage */,
 422                  false   /* recordPeakUsage */,
 423                  false   /* recordPostGCusage */,
 424                  false   /* recordAccumulatedGCTime */,
 425                  false   /* recordGCEndTime */,
 426                  false   /* countCollection */ );
 427       break;
 428     case Remark:
 429     case Cleanup:
 430       initialize(manager /* GC manager */,
 431                  cause   /* cause of the GC */,
 432                  true    /* allMemoryPoolsAffected */,
 433                  false   /* recordGCBeginTime */,
 434                  false   /* recordPreGCUsage */,
 435                  false   /* recordPeakUsage */,
 436                  false   /* recordPostGCusage */,
 437                  true    /* recordAccumulatedGCTime */,
 438                  false   /* recordGCEndTime */,
 439                  false   /* countCollection */ );
 440       break;
 441     case CycleEnd:
 442       initialize(manager /* GC manager */,
 443                  cause   /* cause of the GC */,
 444                  true    /* allMemoryPoolsAffected */,
 445                  false   /* recordGCBeginTime */,
 446                  false   /* recordPreGCUsage */,
 447                  true    /* recordPeakUsage */,
 448                  true    /* recordPostGCusage */,
 449                  false   /* recordAccumulatedGCTime */,
 450                  true    /* recordGCEndTime */,
 451                  true    /* countCollection */ );
 452       break;
 453     default:
 454       ShouldNotReachHere();
 455       break;
 456   }
 457 }
 458 
 459 G1MonitoringScope::G1MonitoringScope(G1MonitoringSupport* g1mm, bool full_gc, bool mixed_gc) :
 460   _tcs(full_gc ? g1mm->_full_collection_counters : g1mm->_incremental_collection_counters),
 461   // Full/young/mixed does nothing for legacy monitoring mode
 462   _tms(full_gc ? &g1mm->_full_memory_manager : (mixed_gc ? &g1mm->_mixed_memory_manager : &g1mm->_young_memory_manager),
 463        g1mm->_g1h->gc_cause()),
 464   // Incremental does nothing for default monitoring mode
 465   _tms_incremental(&g1mm->_incremental_memory_manager, g1mm->_g1h->gc_cause(), mixed_gc /* mixed_gc */) {
 466 }
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