32 private:
33 ShenandoahHeap* const _heap;
34 CHeapBitMap _mutator_free_bitmap;
35 CHeapBitMap _collector_free_bitmap;
36 size_t _max;
37
38 // Left-most and right-most region indexes. There are no free regions outside
39 // of [left-most; right-most] index intervals
40 size_t _mutator_leftmost, _mutator_rightmost;
41 size_t _collector_leftmost, _collector_rightmost;
42
43 size_t _capacity;
44 size_t _used;
45
46 void assert_bounds() const NOT_DEBUG_RETURN;
47
48 bool is_mutator_free(size_t idx) const;
49 bool is_collector_free(size_t idx) const;
50
51 HeapWord* try_allocate_in(ShenandoahHeapRegion* region, ShenandoahAllocRequest& req, bool& in_new_region);
52 HeapWord* allocate_single(ShenandoahAllocRequest& req, bool& in_new_region);
53 HeapWord* allocate_contiguous(ShenandoahAllocRequest& req);
54
55 void flip_to_gc(ShenandoahHeapRegion* r);
56
57 void recompute_bounds();
58 void adjust_bounds();
59 bool touches_bounds(size_t num) const;
60
61 void increase_used(size_t amount);
62 void clear_internal();
63
64 size_t collector_count() const { return _collector_free_bitmap.count_one_bits(); }
65 size_t mutator_count() const { return _mutator_free_bitmap.count_one_bits(); }
66
67 void try_recycle_trashed(ShenandoahHeapRegion *r);
68
69 bool can_allocate_from(ShenandoahHeapRegion *r);
70 size_t alloc_capacity(ShenandoahHeapRegion *r);
71 bool has_no_alloc_capacity(ShenandoahHeapRegion *r);
72
73 public:
74 ShenandoahFreeSet(ShenandoahHeap* heap, size_t max_regions);
75
76 void clear();
77 void rebuild();
78
79 void recycle_trash();
80
81 void log_status();
82
83 size_t capacity() const { return _capacity; }
84 size_t used() const { return _used; }
85 size_t available() const {
86 assert(_used <= _capacity, "must use less than capacity");
87 return _capacity - _used;
88 }
89
90 HeapWord* allocate(ShenandoahAllocRequest& req, bool& in_new_region);
91 size_t unsafe_peek_free() const;
92
93 double internal_fragmentation();
94 double external_fragmentation();
95
96 void print_on(outputStream* out) const;
97 };
98
99 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHFREESET_HPP
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32 private:
33 ShenandoahHeap* const _heap;
34 CHeapBitMap _mutator_free_bitmap;
35 CHeapBitMap _collector_free_bitmap;
36 size_t _max;
37
38 // Left-most and right-most region indexes. There are no free regions outside
39 // of [left-most; right-most] index intervals
40 size_t _mutator_leftmost, _mutator_rightmost;
41 size_t _collector_leftmost, _collector_rightmost;
42
43 size_t _capacity;
44 size_t _used;
45
46 void assert_bounds() const NOT_DEBUG_RETURN;
47
48 bool is_mutator_free(size_t idx) const;
49 bool is_collector_free(size_t idx) const;
50
51 HeapWord* try_allocate_in(ShenandoahHeapRegion* region, ShenandoahAllocRequest& req, bool& in_new_region);
52 HeapWord* allocate_with_affiliation(ShenandoahRegionAffiliation affiliation, ShenandoahAllocRequest& req, bool& in_new_region);
53
54 // While holding the heap lock, allocate memory for a single object which is to be entirely contained
55 // within a single HeapRegion as characterized by req. The req.size() value is known to be less than or
56 // equal to ShenandoahHeapRegion::humongous_threshold_words(). The caller of allocate_single is responsible
57 // for registering the resulting object and setting the remembered set card values as appropriate. The
58 // most common case is that we are allocating a PLAB in which case object registering and card dirtying
59 // is managed after the PLAB is divided into individual objects.
60 HeapWord* allocate_single(ShenandoahAllocRequest& req, bool& in_new_region);
61 HeapWord* allocate_contiguous(ShenandoahAllocRequest& req);
62
63 void flip_to_gc(ShenandoahHeapRegion* r);
64
65 void recompute_bounds();
66 void adjust_bounds();
67 bool touches_bounds(size_t num) const;
68
69 void increase_used(size_t amount);
70 void clear_internal();
71
72 void try_recycle_trashed(ShenandoahHeapRegion *r);
73
74 bool can_allocate_from(ShenandoahHeapRegion *r);
75 size_t alloc_capacity(ShenandoahHeapRegion *r);
76 bool has_no_alloc_capacity(ShenandoahHeapRegion *r);
77
78 public:
79 ShenandoahFreeSet(ShenandoahHeap* heap, size_t max_regions);
80
81 // Number of regions dedicated to GC allocations (for evacuation or promotion) that are currently free
82 size_t collector_count() const { return _collector_free_bitmap.count_one_bits(); }
83
84 // Number of regions dedicated to mutator allocations that are currently free
85 size_t mutator_count() const { return _mutator_free_bitmap.count_one_bits(); }
86
87 void clear();
88 void rebuild();
89
90 void recycle_trash();
91
92 void log_status();
93
94 size_t capacity() const { return _capacity; }
95 size_t used() const { return _used; }
96 size_t available() const {
97 assert(_used <= _capacity, "must use less than capacity");
98 return _capacity - _used;
99 }
100
101 HeapWord* allocate(ShenandoahAllocRequest& req, bool& in_new_region);
102 size_t unsafe_peek_free() const;
103
104 double internal_fragmentation();
105 double external_fragmentation();
106
107 void print_on(outputStream* out) const;
108
109 void reserve_regions(size_t to_reserve);
110 };
111
112 #endif // SHARE_GC_SHENANDOAH_SHENANDOAHFREESET_HPP
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