36 class ParGCAllocBufferWithBOT;
  37 
  38 class TenuredGeneration: public OneContigSpaceCardGeneration {
  39   friend class VMStructs;
  40  protected:
  41 
  42 #if INCLUDE_ALL_GCS
  43   // To support parallel promotion: an array of parallel allocation
  44   // buffers, one per thread, initially NULL.
  45   ParGCAllocBufferWithBOT** _alloc_buffers;
  46 #endif // INCLUDE_ALL_GCS
  47 
  48   // Retire all alloc buffers before a full GC, so that they will be
  49   // re-allocated at the start of the next young GC.
  50   void retire_alloc_buffers_before_full_gc();
  51 
  52   GenerationCounters*   _gen_counters;
  53   CSpaceCounters*       _space_counters;
  54 
  55  public:
  56   TenuredGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
  57                     GenRemSet* remset);
  58 
  59   Generation::Name kind() { return Generation::MarkSweepCompact; }
  60 
  61   // Printing
  62   const char* name() const;
  63   const char* short_name() const { return "Tenured"; }
  64   bool must_be_youngest() const { return false; }
  65   bool must_be_oldest() const { return true; }
  66 
  67   // Does a "full" (forced) collection invoked on this generation collect
  68   // all younger generations as well? Note that this is a
  69   // hack to allow the collection of the younger gen first if the flag is
  70   // set.
  71   virtual bool full_collects_younger_generations() const {
  72     return !ScavengeBeforeFullGC;
  73   }
  74 
  75   virtual void gc_prologue(bool full);
  76   virtual void gc_epilogue(bool full);

  81   virtual void collect(bool full,
  82                        bool clear_all_soft_refs,
  83                        size_t size,
  84                        bool is_tlab);
  85   virtual void compute_new_size();
  86 
  87 #if INCLUDE_ALL_GCS
  88   // Overrides.
  89   virtual oop par_promote(int thread_num,
  90                           oop obj, markOop m, size_t word_sz);
  91   virtual void par_promote_alloc_undo(int thread_num,
  92                                       HeapWord* obj, size_t word_sz);
  93   virtual void par_promote_alloc_done(int thread_num);
  94 #endif // INCLUDE_ALL_GCS
  95 
  96   // Performance Counter support
  97   void update_counters();
  98 
  99   // Statistics
 100 
 101   virtual void update_gc_stats(int level, bool full);
 102 
 103   virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
 104 
 105   void verify_alloc_buffers_clean();
 106 };
 107 
 108 #endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP

  36 class ParGCAllocBufferWithBOT;
  37 
  38 class TenuredGeneration: public OneContigSpaceCardGeneration {
  39   friend class VMStructs;
  40  protected:
  41 
  42 #if INCLUDE_ALL_GCS
  43   // To support parallel promotion: an array of parallel allocation
  44   // buffers, one per thread, initially NULL.
  45   ParGCAllocBufferWithBOT** _alloc_buffers;
  46 #endif // INCLUDE_ALL_GCS
  47 
  48   // Retire all alloc buffers before a full GC, so that they will be
  49   // re-allocated at the start of the next young GC.
  50   void retire_alloc_buffers_before_full_gc();
  51 
  52   GenerationCounters*   _gen_counters;
  53   CSpaceCounters*       _space_counters;
  54 
  55  public:
  56   TenuredGeneration(ReservedSpace rs, size_t initial_byte_size,
  57                     GenRemSet* remset);
  58 
  59   Generation::Name kind() { return Generation::MarkSweepCompact; }
  60 
  61   // Printing
  62   const char* name() const;
  63   const char* short_name() const { return "Tenured"; }
  64   bool must_be_youngest() const { return false; }
  65   bool must_be_oldest() const { return true; }
  66 
  67   // Does a "full" (forced) collection invoked on this generation collect
  68   // all younger generations as well? Note that this is a
  69   // hack to allow the collection of the younger gen first if the flag is
  70   // set.
  71   virtual bool full_collects_younger_generations() const {
  72     return !ScavengeBeforeFullGC;
  73   }
  74 
  75   virtual void gc_prologue(bool full);
  76   virtual void gc_epilogue(bool full);

  81   virtual void collect(bool full,
  82                        bool clear_all_soft_refs,
  83                        size_t size,
  84                        bool is_tlab);
  85   virtual void compute_new_size();
  86 
  87 #if INCLUDE_ALL_GCS
  88   // Overrides.
  89   virtual oop par_promote(int thread_num,
  90                           oop obj, markOop m, size_t word_sz);
  91   virtual void par_promote_alloc_undo(int thread_num,
  92                                       HeapWord* obj, size_t word_sz);
  93   virtual void par_promote_alloc_done(int thread_num);
  94 #endif // INCLUDE_ALL_GCS
  95 
  96   // Performance Counter support
  97   void update_counters();
  98 
  99   // Statistics
 100 
 101   virtual void update_gc_stats(Generation* current_generation, bool full);
 102 
 103   virtual bool promotion_attempt_is_safe(size_t max_promoted_in_bytes) const;
 104 
 105   void verify_alloc_buffers_clean();
 106 };
 107 
 108 #endif // SHARE_VM_MEMORY_TENUREDGENERATION_HPP