91 _predictor(predictor),
92 _marking_times_s(10, 0.95),
93 _allocation_rate_s(10, 0.95),
94 _last_unrestrained_young_size(0)
95 {
96 }
97
98 size_t G1AdaptiveIHOPControl::actual_target_threshold() const {
99 guarantee(_target_occupancy > 0, "Target occupancy still not updated yet.");
100 // The actual target threshold takes the heap reserve and the expected waste in
101 // free space into account.
102 // _heap_reserve is that part of the total heap capacity that is reserved for
103 // eventual promotion failure.
104 // _heap_waste is the amount of space will never be reclaimed in any
105 // heap, so can not be used for allocation during marking and must always be
106 // considered.
107
108 double safe_total_heap_percentage = MIN2((double)(_heap_reserve_percent + _heap_waste_percent), 100.0);
109
110 return (size_t)MIN2(
111 G1CollectedHeap::heap()->max_capacity() * (100.0 - safe_total_heap_percentage) / 100.0,
112 _target_occupancy * (100.0 - _heap_waste_percent) / 100.0
113 );
114 }
115
116 double G1AdaptiveIHOPControl::predict(TruncatedSeq const* seq) const {
117 return _predictor->predict_zero_bounded(seq);
118 }
119
120 bool G1AdaptiveIHOPControl::have_enough_data_for_prediction() const {
121 return ((size_t)_marking_times_s.num() >= G1AdaptiveIHOPNumInitialSamples) &&
122 ((size_t)_allocation_rate_s.num() >= G1AdaptiveIHOPNumInitialSamples);
123 }
124
125 size_t G1AdaptiveIHOPControl::get_conc_mark_start_threshold() {
126 if (have_enough_data_for_prediction()) {
127 double pred_marking_time = predict(&_marking_times_s);
128 double pred_promotion_rate = predict(&_allocation_rate_s);
129 size_t pred_promotion_size = (size_t)(pred_marking_time * pred_promotion_rate);
130
131 size_t predicted_needed_bytes_during_marking =
169 "predicted marking phase length: %1.2fms, prediction active: %s",
170 get_conc_mark_start_threshold(),
171 percent_of(get_conc_mark_start_threshold(), actual_target),
172 actual_target,
173 G1CollectedHeap::heap()->used(),
174 _last_unrestrained_young_size,
175 predict(&_allocation_rate_s),
176 predict(&_marking_times_s) * 1000.0,
177 have_enough_data_for_prediction() ? "true" : "false");
178 }
179
180 void G1AdaptiveIHOPControl::send_trace_event(G1NewTracer* tracer) {
181 G1IHOPControl::send_trace_event(tracer);
182 tracer->report_adaptive_ihop_statistics(get_conc_mark_start_threshold(),
183 actual_target_threshold(),
184 G1CollectedHeap::heap()->used(),
185 _last_unrestrained_young_size,
186 predict(&_allocation_rate_s),
187 predict(&_marking_times_s),
188 have_enough_data_for_prediction());
189 }
|
91 _predictor(predictor),
92 _marking_times_s(10, 0.95),
93 _allocation_rate_s(10, 0.95),
94 _last_unrestrained_young_size(0)
95 {
96 }
97
98 size_t G1AdaptiveIHOPControl::actual_target_threshold() const {
99 guarantee(_target_occupancy > 0, "Target occupancy still not updated yet.");
100 // The actual target threshold takes the heap reserve and the expected waste in
101 // free space into account.
102 // _heap_reserve is that part of the total heap capacity that is reserved for
103 // eventual promotion failure.
104 // _heap_waste is the amount of space will never be reclaimed in any
105 // heap, so can not be used for allocation during marking and must always be
106 // considered.
107
108 double safe_total_heap_percentage = MIN2((double)(_heap_reserve_percent + _heap_waste_percent), 100.0);
109
110 return (size_t)MIN2(
111 G1CollectedHeap::heap()->soft_max_capacity() * (100.0 - safe_total_heap_percentage) / 100.0,
112 _target_occupancy * (100.0 - _heap_waste_percent) / 100.0
113 );
114 }
115
116 double G1AdaptiveIHOPControl::predict(TruncatedSeq const* seq) const {
117 return _predictor->predict_zero_bounded(seq);
118 }
119
120 bool G1AdaptiveIHOPControl::have_enough_data_for_prediction() const {
121 return ((size_t)_marking_times_s.num() >= G1AdaptiveIHOPNumInitialSamples) &&
122 ((size_t)_allocation_rate_s.num() >= G1AdaptiveIHOPNumInitialSamples);
123 }
124
125 size_t G1AdaptiveIHOPControl::get_conc_mark_start_threshold() {
126 if (have_enough_data_for_prediction()) {
127 double pred_marking_time = predict(&_marking_times_s);
128 double pred_promotion_rate = predict(&_allocation_rate_s);
129 size_t pred_promotion_size = (size_t)(pred_marking_time * pred_promotion_rate);
130
131 size_t predicted_needed_bytes_during_marking =
169 "predicted marking phase length: %1.2fms, prediction active: %s",
170 get_conc_mark_start_threshold(),
171 percent_of(get_conc_mark_start_threshold(), actual_target),
172 actual_target,
173 G1CollectedHeap::heap()->used(),
174 _last_unrestrained_young_size,
175 predict(&_allocation_rate_s),
176 predict(&_marking_times_s) * 1000.0,
177 have_enough_data_for_prediction() ? "true" : "false");
178 }
179
180 void G1AdaptiveIHOPControl::send_trace_event(G1NewTracer* tracer) {
181 G1IHOPControl::send_trace_event(tracer);
182 tracer->report_adaptive_ihop_statistics(get_conc_mark_start_threshold(),
183 actual_target_threshold(),
184 G1CollectedHeap::heap()->used(),
185 _last_unrestrained_young_size,
186 predict(&_allocation_rate_s),
187 predict(&_marking_times_s),
188 have_enough_data_for_prediction());
189 }
190
191 size_t G1AdaptiveIHOPControl::predict_unrestrained_buffer_size() const {
192 // Besides the young size, the promotion bytes of Prepare Mixed and 1st Mixed GC will be counted
193 return _last_unrestrained_young_size + _last_allocated_bytes * 2;
194 }
|