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comparison src/share/vm/memory/generation.hpp @ 9072:8617e38bb4cb

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8008508: CMS does not correctly reduce heap size after a Full GC Reviewed-by: johnc, ysr
author jmasa
date Mon, 11 Feb 2013 10:31:56 -0800
parents da91efe96a93
children 71180a6e5080
comparison
equal deleted inserted replaced
9071:68fe50d4f1d5 9072:8617e38bb4cb
632 // This is shared with other generations. 632 // This is shared with other generations.
633 GenRemSet* _rs; 633 GenRemSet* _rs;
634 // This is local to this generation. 634 // This is local to this generation.
635 BlockOffsetSharedArray* _bts; 635 BlockOffsetSharedArray* _bts;
636 636
637 // current shrinking effect: this damps shrinking when the heap gets empty.
638 size_t _shrink_factor;
639
640 size_t _min_heap_delta_bytes; // Minimum amount to expand.
641
642 // Some statistics from before gc started.
643 // These are gathered in the gc_prologue (and should_collect)
644 // to control growing/shrinking policy in spite of promotions.
645 size_t _capacity_at_prologue;
646 size_t _used_at_prologue;
647
637 CardGeneration(ReservedSpace rs, size_t initial_byte_size, int level, 648 CardGeneration(ReservedSpace rs, size_t initial_byte_size, int level,
638 GenRemSet* remset); 649 GenRemSet* remset);
639 650
640 public: 651 public:
641 652
642 // Attempt to expand the generation by "bytes". Expand by at a 653 // Attempt to expand the generation by "bytes". Expand by at a
643 // minimum "expand_bytes". Return true if some amount (not 654 // minimum "expand_bytes". Return true if some amount (not
644 // necessarily the full "bytes") was done. 655 // necessarily the full "bytes") was done.
645 virtual bool expand(size_t bytes, size_t expand_bytes); 656 virtual bool expand(size_t bytes, size_t expand_bytes);
657
658 // Shrink generation with specified size (returns false if unable to shrink)
659 virtual void shrink(size_t bytes) = 0;
660
661 virtual void compute_new_size();
646 662
647 virtual void clear_remembered_set(); 663 virtual void clear_remembered_set();
648 664
649 virtual void invalidate_remembered_set(); 665 virtual void invalidate_remembered_set();
650 666
665 friend class VMStructs; 681 friend class VMStructs;
666 // Abstractly, this is a subtype that gets access to protected fields. 682 // Abstractly, this is a subtype that gets access to protected fields.
667 friend class VM_PopulateDumpSharedSpace; 683 friend class VM_PopulateDumpSharedSpace;
668 684
669 protected: 685 protected:
670 size_t _min_heap_delta_bytes; // Minimum amount to expand.
671 ContiguousSpace* _the_space; // actual space holding objects 686 ContiguousSpace* _the_space; // actual space holding objects
672 WaterMark _last_gc; // watermark between objects allocated before 687 WaterMark _last_gc; // watermark between objects allocated before
673 // and after last GC. 688 // and after last GC.
674 689
675 // Grow generation with specified size (returns false if unable to grow) 690 // Grow generation with specified size (returns false if unable to grow)
686 // Accessing spaces 701 // Accessing spaces
687 ContiguousSpace* the_space() const { return _the_space; } 702 ContiguousSpace* the_space() const { return _the_space; }
688 703
689 public: 704 public:
690 OneContigSpaceCardGeneration(ReservedSpace rs, size_t initial_byte_size, 705 OneContigSpaceCardGeneration(ReservedSpace rs, size_t initial_byte_size,
691 size_t min_heap_delta_bytes,
692 int level, GenRemSet* remset, 706 int level, GenRemSet* remset,
693 ContiguousSpace* space) : 707 ContiguousSpace* space) :
694 CardGeneration(rs, initial_byte_size, level, remset), 708 CardGeneration(rs, initial_byte_size, level, remset),
695 _the_space(space), _min_heap_delta_bytes(min_heap_delta_bytes) 709 _the_space(space)
696 {} 710 {}
697 711
698 inline bool is_in(const void* p) const; 712 inline bool is_in(const void* p) const;
699 713
700 // Space enquiries 714 // Space enquiries