46 double _last_allocation_time_s;
47 // Amount of bytes allocated during _last_allocation_time_s.
48 size_t _last_allocated_bytes;
49
50 // Initialize an instance with the initial IHOP value in percent. The target
51 // occupancy will be updated at the first heap expansion.
52 G1IHOPControl(double initial_ihop_percent);
53
54 // Most recent time from the end of the initial mark to the start of the first
55 // mixed gc.
56 virtual double last_marking_length_s() const = 0;
57 public:
58 virtual ~G1IHOPControl() { }
59
60 // Get the current non-young occupancy at which concurrent marking should start.
61 virtual size_t get_conc_mark_start_threshold() = 0;
62
63 // Adjust target occupancy.
64 virtual void update_target_occupancy(size_t new_target_occupancy);
65 // Update information about time during which allocations in the Java heap occurred,
66 // how large these allocations were in bytes, and an additional buffer.
67 // The allocations should contain any amount of space made unusable for further
68 // allocation, e.g. any waste caused by TLAB allocation, space at the end of
69 // humongous objects that can not be used for allocation, etc.
70 // Together with the target occupancy, this additional buffer should contain the
71 // difference between old gen size and total heap size at the start of reclamation,
72 // and space required for that reclamation.
73 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size);
74 // Update the time spent in the mutator beginning from the end of initial mark to
75 // the first mixed gc.
76 virtual void update_marking_length(double marking_length_s) = 0;
77
78 virtual void print();
79 virtual void send_trace_event(G1NewTracer* tracer);
80 };
81
82 // The returned concurrent mark starting occupancy threshold is a fixed value
83 // relative to the maximum heap size.
84 class G1StaticIHOPControl : public G1IHOPControl {
85 // Most recent mutator time between the end of initial mark to the start of the
86 // first mixed gc.
87 double _last_marking_length_s;
88 protected:
89 double last_marking_length_s() const { return _last_marking_length_s; }
90 public:
91 G1StaticIHOPControl(double ihop_percent);
92
93 size_t get_conc_mark_start_threshold() {
123 // as there is no marking or mixed gc that could impact its size too much.
124 size_t _last_unrestrained_young_size;
125
126 // Get a new prediction bounded below by zero from the given sequence.
127 double predict(TruncatedSeq const* seq) const;
128
129 bool have_enough_data_for_prediction() const;
130
131 // The "actual" target threshold the algorithm wants to keep during and at the
132 // end of marking. This is typically lower than the requested threshold, as the
133 // algorithm needs to consider restrictions by the environment.
134 size_t actual_target_threshold() const;
135 protected:
136 virtual double last_marking_length_s() const { return _marking_times_s.last(); }
137 public:
138 G1AdaptiveIHOPControl(double ihop_percent,
139 G1Predictions const* predictor,
140 size_t heap_reserve_percent, // The percentage of total heap capacity that should not be tapped into.
141 size_t heap_waste_percent); // The percentage of the free space in the heap that we think is not usable for allocation.
142
143 virtual size_t get_conc_mark_start_threshold();
144
145 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes, size_t additional_buffer_size);
146 virtual void update_marking_length(double marking_length_s);
147
148 virtual void print();
149 virtual void send_trace_event(G1NewTracer* tracer);
150 };
151
152 #endif // SHARE_GC_G1_G1IHOPCONTROL_HPP
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46 double _last_allocation_time_s;
47 // Amount of bytes allocated during _last_allocation_time_s.
48 size_t _last_allocated_bytes;
49
50 // Initialize an instance with the initial IHOP value in percent. The target
51 // occupancy will be updated at the first heap expansion.
52 G1IHOPControl(double initial_ihop_percent);
53
54 // Most recent time from the end of the initial mark to the start of the first
55 // mixed gc.
56 virtual double last_marking_length_s() const = 0;
57 public:
58 virtual ~G1IHOPControl() { }
59
60 // Get the current non-young occupancy at which concurrent marking should start.
61 virtual size_t get_conc_mark_start_threshold() = 0;
62
63 // Adjust target occupancy.
64 virtual void update_target_occupancy(size_t new_target_occupancy);
65 // Update information about time during which allocations in the Java heap occurred,
66 // and how large these allocations were in bytes.
67 // The allocations should contain any amount of space made unusable for further
68 // allocation, e.g. any waste caused by TLAB allocation, space at the end of
69 // humongous objects that can not be used for allocation, etc.
70 // Together with the target occupancy, this additional buffer should contain the
71 // difference between old gen size and total heap size at the start of reclamation,
72 // and space required for that reclamation.
73 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes);
74 virtual void update_additional_buffer(size_t additional_buffer_bytes) { }
75 // Update the time spent in the mutator beginning from the end of initial mark to
76 // the first mixed gc.
77 virtual void update_marking_length(double marking_length_s) = 0;
78
79 virtual void print();
80 virtual void send_trace_event(G1NewTracer* tracer);
81 };
82
83 // The returned concurrent mark starting occupancy threshold is a fixed value
84 // relative to the maximum heap size.
85 class G1StaticIHOPControl : public G1IHOPControl {
86 // Most recent mutator time between the end of initial mark to the start of the
87 // first mixed gc.
88 double _last_marking_length_s;
89 protected:
90 double last_marking_length_s() const { return _last_marking_length_s; }
91 public:
92 G1StaticIHOPControl(double ihop_percent);
93
94 size_t get_conc_mark_start_threshold() {
124 // as there is no marking or mixed gc that could impact its size too much.
125 size_t _last_unrestrained_young_size;
126
127 // Get a new prediction bounded below by zero from the given sequence.
128 double predict(TruncatedSeq const* seq) const;
129
130 bool have_enough_data_for_prediction() const;
131
132 // The "actual" target threshold the algorithm wants to keep during and at the
133 // end of marking. This is typically lower than the requested threshold, as the
134 // algorithm needs to consider restrictions by the environment.
135 size_t actual_target_threshold() const;
136 protected:
137 virtual double last_marking_length_s() const { return _marking_times_s.last(); }
138 public:
139 G1AdaptiveIHOPControl(double ihop_percent,
140 G1Predictions const* predictor,
141 size_t heap_reserve_percent, // The percentage of total heap capacity that should not be tapped into.
142 size_t heap_waste_percent); // The percentage of the free space in the heap that we think is not usable for allocation.
143
144 virtual void update_target_occupancy(size_t new_target_occupancy);
145 virtual size_t get_conc_mark_start_threshold();
146
147 virtual void update_allocation_info(double allocation_time_s, size_t allocated_bytes);
148 virtual void update_additional_buffer(size_t additional_buffer_bytes);
149 virtual void update_marking_length(double marking_length_s);
150
151 virtual void print();
152 virtual void send_trace_event(G1NewTracer* tracer);
153 };
154
155 #endif // SHARE_GC_G1_G1IHOPCONTROL_HPP
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