259   PLABStats _old_plab_stats;
 260 
 261   // It specifies whether we should attempt to expand the heap after a
 262   // region allocation failure. If heap expansion fails we set this to
 263   // false so that we don't re-attempt the heap expansion (it's likely
 264   // that subsequent expansion attempts will also fail if one fails).
 265   // Currently, it is only consulted during GC and it's reset at the
 266   // start of each GC.
 267   bool _expand_heap_after_alloc_failure;
 268 
 269   // It resets the mutator alloc region before new allocations can take place.
 270   void init_mutator_alloc_region();
 271 
 272   // It releases the mutator alloc region.
 273   void release_mutator_alloc_region();
 274 
 275   // It initializes the GC alloc regions at the start of a GC.
 276   void init_gc_alloc_regions(EvacuationInfo& evacuation_info);
 277 
 278   // It releases the GC alloc regions at the end of a GC.
 279   void release_gc_alloc_regions(uint no_of_gc_workers, EvacuationInfo& evacuation_info);
 280 
 281   // It does any cleanup that needs to be done on the GC alloc regions
 282   // before a Full GC.
 283   void abandon_gc_alloc_regions();
 284 
 285   // Helper for monitoring and management support.
 286   G1MonitoringSupport* _g1mm;
 287 
 288   // Records whether the region at the given index is (still) a
 289   // candidate for eager reclaim.  Only valid for humongous start
 290   // regions; other regions have unspecified values.  Humongous start
 291   // regions are initialized at start of collection pause, with
 292   // candidates removed from the set as they are found reachable from
 293   // roots or the young generation.
 294   class HumongousReclaimCandidates : public G1BiasedMappedArray<bool> {
 295    protected:
 296     bool default_value() const { return false; }
 297    public:
 298     void clear() { G1BiasedMappedArray<bool>::clear(); }
 299     void set_candidate(uint region, bool value) {

 259   PLABStats _old_plab_stats;
 260 
 261   // It specifies whether we should attempt to expand the heap after a
 262   // region allocation failure. If heap expansion fails we set this to
 263   // false so that we don't re-attempt the heap expansion (it's likely
 264   // that subsequent expansion attempts will also fail if one fails).
 265   // Currently, it is only consulted during GC and it's reset at the
 266   // start of each GC.
 267   bool _expand_heap_after_alloc_failure;
 268 
 269   // It resets the mutator alloc region before new allocations can take place.
 270   void init_mutator_alloc_region();
 271 
 272   // It releases the mutator alloc region.
 273   void release_mutator_alloc_region();
 274 
 275   // It initializes the GC alloc regions at the start of a GC.
 276   void init_gc_alloc_regions(EvacuationInfo& evacuation_info);
 277 
 278   // It releases the GC alloc regions at the end of a GC.
 279   void release_gc_alloc_regions(EvacuationInfo& evacuation_info);
 280 
 281   // It does any cleanup that needs to be done on the GC alloc regions
 282   // before a Full GC.
 283   void abandon_gc_alloc_regions();
 284 
 285   // Helper for monitoring and management support.
 286   G1MonitoringSupport* _g1mm;
 287 
 288   // Records whether the region at the given index is (still) a
 289   // candidate for eager reclaim.  Only valid for humongous start
 290   // regions; other regions have unspecified values.  Humongous start
 291   // regions are initialized at start of collection pause, with
 292   // candidates removed from the set as they are found reachable from
 293   // roots or the young generation.
 294   class HumongousReclaimCandidates : public G1BiasedMappedArray<bool> {
 295    protected:
 296     bool default_value() const { return false; }
 297    public:
 298     void clear() { G1BiasedMappedArray<bool>::clear(); }
 299     void set_candidate(uint region, bool value) {