28 #include "memory/allocation.hpp"
29
30 class G1Analytics;
31 class G1CollectedHeap;
32
33 class G1HeapSizingPolicy: public CHeapObj<mtGC> {
34 // MinOverThresholdForGrowth must be less than the number of recorded
35 // pause times in G1Analytics, representing the minimum number of pause
36 // time ratios that exceed GCTimeRatio before a heap expansion will be triggered.
37 const static uint MinOverThresholdForGrowth = 4;
38
39 const G1CollectedHeap* _g1h;
40 const G1Analytics* _analytics;
41
42 const uint _num_prev_pauses_for_heuristics;
43 // Ratio check data for determining if heap growth is necessary.
44 uint _ratio_over_threshold_count;
45 double _ratio_over_threshold_sum;
46 uint _pauses_since_start;
47
48
49 protected:
50 G1HeapSizingPolicy(const G1CollectedHeap* g1h, const G1Analytics* analytics);
51 public:
52
53 // If an expansion would be appropriate, because recent GC overhead had
54 // exceeded the desired limit, return an amount to expand by.
55 virtual size_t expansion_amount();
56
57 // Clear ratio tracking data used by expansion_amount().
58 void clear_ratio_check_data();
59
60 static G1HeapSizingPolicy* create(const G1CollectedHeap* g1h, const G1Analytics* analytics);
61 };
62
63 #endif // SHARE_GC_G1_G1HEAPSIZINGPOLICY_HPP
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28 #include "memory/allocation.hpp"
29
30 class G1Analytics;
31 class G1CollectedHeap;
32
33 class G1HeapSizingPolicy: public CHeapObj<mtGC> {
34 // MinOverThresholdForGrowth must be less than the number of recorded
35 // pause times in G1Analytics, representing the minimum number of pause
36 // time ratios that exceed GCTimeRatio before a heap expansion will be triggered.
37 const static uint MinOverThresholdForGrowth = 4;
38
39 const G1CollectedHeap* _g1h;
40 const G1Analytics* _analytics;
41
42 const uint _num_prev_pauses_for_heuristics;
43 // Ratio check data for determining if heap growth is necessary.
44 uint _ratio_over_threshold_count;
45 double _ratio_over_threshold_sum;
46 uint _pauses_since_start;
47
48 G1HeapSizingPolicy(const G1CollectedHeap* g1h, const G1Analytics* analytics);
49
50 public:
51
52 // If an expansion would be appropriate, because recent GC overhead had
53 // exceeded the desired limit, return an amount to expand by.
54 size_t expansion_amount_after_young_collection();
55
56 size_t shrink_amount_at_last_mixed_gc(size_t desired_bytes_after_concurrent_mark);
57
58 // Calculate the target capacity based on used bytes and free ratio
59 size_t target_heap_capacity(size_t used_bytes, uintx free_ratio) const;
60 // Clear ratio tracking data used by expansion_amount().
61 void clear_ratio_check_data();
62
63 static G1HeapSizingPolicy* create(const G1CollectedHeap* g1h, const G1Analytics* analytics);
64 };
65
66 #endif // SHARE_GC_G1_G1HEAPSIZINGPOLICY_HPP
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