158   // of the old generation.
 159   HeapWord* failed_mem_allocate(size_t size);
 160 
 161   // Support for System.gc()
 162   void collect(GCCause::Cause cause);
 163 
 164   // These also should be called by the vm thread at a safepoint (e.g., from a
 165   // VM operation).
 166   //
 167   // The first collects the young generation only, unless the scavenge fails; it
 168   // will then attempt a full gc.  The second collects the entire heap; if
 169   // maximum_compaction is true, it will compact everything and clear all soft
 170   // references.
 171   inline void invoke_scavenge();
 172 
 173   // Perform a full collection
 174   virtual void do_full_collection(bool clear_all_soft_refs);
 175 
 176   bool supports_inline_contig_alloc() const { return !UseNUMA; }
 177 
 178   HeapWord** top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord**)-1; }
 179   HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; }
 180 
 181   void ensure_parsability(bool retire_tlabs);
 182   void accumulate_statistics_all_tlabs();
 183   void resize_all_tlabs();
 184 
 185   bool supports_tlab_allocation() const { return true; }
 186 
 187   size_t tlab_capacity(Thread* thr) const;
 188   size_t tlab_used(Thread* thr) const;
 189   size_t unsafe_max_tlab_alloc(Thread* thr) const;
 190 
 191   // Can a compiler initialize a new object without store barriers?
 192   // This permission only extends from the creation of a new object
 193   // via a TLAB up to the first subsequent safepoint.
 194   virtual bool can_elide_tlab_store_barriers() const {
 195     return true;
 196   }
 197 
 198   virtual bool card_mark_must_follow_store() const {

 158   // of the old generation.
 159   HeapWord* failed_mem_allocate(size_t size);
 160 
 161   // Support for System.gc()
 162   void collect(GCCause::Cause cause);
 163 
 164   // These also should be called by the vm thread at a safepoint (e.g., from a
 165   // VM operation).
 166   //
 167   // The first collects the young generation only, unless the scavenge fails; it
 168   // will then attempt a full gc.  The second collects the entire heap; if
 169   // maximum_compaction is true, it will compact everything and clear all soft
 170   // references.
 171   inline void invoke_scavenge();
 172 
 173   // Perform a full collection
 174   virtual void do_full_collection(bool clear_all_soft_refs);
 175 
 176   bool supports_inline_contig_alloc() const { return !UseNUMA; }
 177 
 178   HeapWord* volatile* top_addr() const { return !UseNUMA ? young_gen()->top_addr() : (HeapWord* volatile*)-1; }
 179   HeapWord** end_addr() const { return !UseNUMA ? young_gen()->end_addr() : (HeapWord**)-1; }
 180 
 181   void ensure_parsability(bool retire_tlabs);
 182   void accumulate_statistics_all_tlabs();
 183   void resize_all_tlabs();
 184 
 185   bool supports_tlab_allocation() const { return true; }
 186 
 187   size_t tlab_capacity(Thread* thr) const;
 188   size_t tlab_used(Thread* thr) const;
 189   size_t unsafe_max_tlab_alloc(Thread* thr) const;
 190 
 191   // Can a compiler initialize a new object without store barriers?
 192   // This permission only extends from the creation of a new object
 193   // via a TLAB up to the first subsequent safepoint.
 194   virtual bool can_elide_tlab_store_barriers() const {
 195     return true;
 196   }
 197 
 198   virtual bool card_mark_must_follow_store() const {