135
136 // Incremental CSet attributes
137 _inc_cset_build_state(Inactive),
138 _inc_cset_head(NULL),
139 _inc_cset_tail(NULL),
140 _inc_cset_bytes_used_before(0),
141 _inc_cset_max_finger(NULL),
142 _inc_cset_recorded_rs_lengths(0),
143 _inc_cset_recorded_rs_lengths_diffs(0),
144 _inc_cset_predicted_elapsed_time_ms(0.0),
145 _inc_cset_predicted_elapsed_time_ms_diffs(0.0),
146
147 // add here any more surv rate groups
148 _recorded_survivor_regions(0),
149 _recorded_survivor_head(NULL),
150 _recorded_survivor_tail(NULL),
151 _survivors_age_table(true),
152
153 _gc_overhead_perc(0.0),
154
155 _last_old_allocated_bytes(0),
156 _ihop_control(NULL),
157 _initial_mark_to_mixed() {
158
159 // SurvRateGroups below must be initialized after the predictor because they
160 // indirectly use it through this object passed to their constructor.
161 _short_lived_surv_rate_group =
162 new SurvRateGroup(&_predictor, "Short Lived", G1YoungSurvRateNumRegionsSummary);
163 _survivor_surv_rate_group =
164 new SurvRateGroup(&_predictor, "Survivor", G1YoungSurvRateNumRegionsSummary);
165
166 // Set up the region size and associated fields. Given that the
167 // policy is created before the heap, we have to set this up here,
168 // so it's done as soon as possible.
169
170 // It would have been natural to pass initial_heap_byte_size() and
171 // max_heap_byte_size() to setup_heap_region_size() but those have
172 // not been set up at this point since they should be aligned with
173 // the region size. So, there is a circular dependency here. We base
174 // the region size on the heap size, but the heap size should be
175 // aligned with the region size. To get around this we use the
839 // transitions and make sure we start with young GCs after the Full GC.
840 collector_state()->set_gcs_are_young(true);
841 collector_state()->set_last_young_gc(false);
842 collector_state()->set_initiate_conc_mark_if_possible(need_to_start_conc_mark("end of Full GC", 0));
843 collector_state()->set_during_initial_mark_pause(false);
844 collector_state()->set_in_marking_window(false);
845 collector_state()->set_in_marking_window_im(false);
846
847 _short_lived_surv_rate_group->start_adding_regions();
848 // also call this on any additional surv rate groups
849
850 record_survivor_regions(0, NULL, NULL);
851
852 _free_regions_at_end_of_collection = _g1->num_free_regions();
853 // Reset survivors SurvRateGroup.
854 _survivor_surv_rate_group->reset();
855 update_young_list_max_and_target_length();
856 update_rs_lengths_prediction();
857 _collectionSetChooser->clear();
858
859 _last_old_allocated_bytes = 0;
860
861 record_pause(FullGC, _full_collection_start_sec, end_sec);
862 }
863
864 void G1CollectorPolicy::record_stop_world_start() {
865 _stop_world_start = os::elapsedTime();
866 }
867
868 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec) {
869 // We only need to do this here as the policy will only be applied
870 // to the GC we're about to start. so, no point is calculating this
871 // every time we calculate / recalculate the target young length.
872 update_survivors_policy();
873
874 assert(_g1->used() == _g1->recalculate_used(),
875 "sanity, used: " SIZE_FORMAT " recalculate_used: " SIZE_FORMAT,
876 _g1->used(), _g1->recalculate_used());
877
878 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0;
879 _trace_young_gen_time_data.record_start_collection(s_w_t_ms);
1193 old_cset_region_length());
1194 }
1195
1196 _constant_other_time_ms_seq->add(constant_other_time_ms(pause_time_ms));
1197
1198 _pending_cards_seq->add((double) _pending_cards);
1199 _rs_lengths_seq->add((double) _max_rs_lengths);
1200 }
1201
1202 collector_state()->set_in_marking_window(new_in_marking_window);
1203 collector_state()->set_in_marking_window_im(new_in_marking_window_im);
1204 _free_regions_at_end_of_collection = _g1->num_free_regions();
1205 // IHOP control wants to know the expected young gen length if it were not
1206 // restrained by the heap reserve. Using the actual length would make the
1207 // prediction too small and the limit the young gen every time we get to the
1208 // predicted target occupancy.
1209 size_t last_unrestrained_young_length = update_young_list_max_and_target_length();
1210 update_rs_lengths_prediction();
1211
1212 update_ihop_prediction(app_time_ms / 1000.0,
1213 _last_old_allocated_bytes,
1214 last_unrestrained_young_length * HeapRegion::GrainBytes);
1215 _last_old_allocated_bytes = 0;
1216
1217 // Note that _mmu_tracker->max_gc_time() returns the time in seconds.
1218 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0;
1219
1220 double scan_hcc_time_ms = average_time_ms(G1GCPhaseTimes::ScanHCC);
1221
1222 if (update_rs_time_goal_ms < scan_hcc_time_ms) {
1223 ergo_verbose2(ErgoTiming,
1224 "adjust concurrent refinement thresholds",
1225 ergo_format_reason("Scanning the HCC expected to take longer than Update RS time goal")
1226 ergo_format_ms("Update RS time goal")
1227 ergo_format_ms("Scan HCC time"),
1228 update_rs_time_goal_ms,
1229 scan_hcc_time_ms);
1230
1231 update_rs_time_goal_ms = 0;
1232 } else {
1233 update_rs_time_goal_ms -= scan_hcc_time_ms;
1234 }
1235 adjust_concurrent_refinement(average_time_ms(G1GCPhaseTimes::UpdateRS) - scan_hcc_time_ms,
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135
136 // Incremental CSet attributes
137 _inc_cset_build_state(Inactive),
138 _inc_cset_head(NULL),
139 _inc_cset_tail(NULL),
140 _inc_cset_bytes_used_before(0),
141 _inc_cset_max_finger(NULL),
142 _inc_cset_recorded_rs_lengths(0),
143 _inc_cset_recorded_rs_lengths_diffs(0),
144 _inc_cset_predicted_elapsed_time_ms(0.0),
145 _inc_cset_predicted_elapsed_time_ms_diffs(0.0),
146
147 // add here any more surv rate groups
148 _recorded_survivor_regions(0),
149 _recorded_survivor_head(NULL),
150 _recorded_survivor_tail(NULL),
151 _survivors_age_table(true),
152
153 _gc_overhead_perc(0.0),
154
155 _bytes_allocated_in_old_since_last_gc(0),
156 _ihop_control(NULL),
157 _initial_mark_to_mixed() {
158
159 // SurvRateGroups below must be initialized after the predictor because they
160 // indirectly use it through this object passed to their constructor.
161 _short_lived_surv_rate_group =
162 new SurvRateGroup(&_predictor, "Short Lived", G1YoungSurvRateNumRegionsSummary);
163 _survivor_surv_rate_group =
164 new SurvRateGroup(&_predictor, "Survivor", G1YoungSurvRateNumRegionsSummary);
165
166 // Set up the region size and associated fields. Given that the
167 // policy is created before the heap, we have to set this up here,
168 // so it's done as soon as possible.
169
170 // It would have been natural to pass initial_heap_byte_size() and
171 // max_heap_byte_size() to setup_heap_region_size() but those have
172 // not been set up at this point since they should be aligned with
173 // the region size. So, there is a circular dependency here. We base
174 // the region size on the heap size, but the heap size should be
175 // aligned with the region size. To get around this we use the
839 // transitions and make sure we start with young GCs after the Full GC.
840 collector_state()->set_gcs_are_young(true);
841 collector_state()->set_last_young_gc(false);
842 collector_state()->set_initiate_conc_mark_if_possible(need_to_start_conc_mark("end of Full GC", 0));
843 collector_state()->set_during_initial_mark_pause(false);
844 collector_state()->set_in_marking_window(false);
845 collector_state()->set_in_marking_window_im(false);
846
847 _short_lived_surv_rate_group->start_adding_regions();
848 // also call this on any additional surv rate groups
849
850 record_survivor_regions(0, NULL, NULL);
851
852 _free_regions_at_end_of_collection = _g1->num_free_regions();
853 // Reset survivors SurvRateGroup.
854 _survivor_surv_rate_group->reset();
855 update_young_list_max_and_target_length();
856 update_rs_lengths_prediction();
857 _collectionSetChooser->clear();
858
859 _bytes_allocated_in_old_since_last_gc = 0;
860
861 record_pause(FullGC, _full_collection_start_sec, end_sec);
862 }
863
864 void G1CollectorPolicy::record_stop_world_start() {
865 _stop_world_start = os::elapsedTime();
866 }
867
868 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec) {
869 // We only need to do this here as the policy will only be applied
870 // to the GC we're about to start. so, no point is calculating this
871 // every time we calculate / recalculate the target young length.
872 update_survivors_policy();
873
874 assert(_g1->used() == _g1->recalculate_used(),
875 "sanity, used: " SIZE_FORMAT " recalculate_used: " SIZE_FORMAT,
876 _g1->used(), _g1->recalculate_used());
877
878 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0;
879 _trace_young_gen_time_data.record_start_collection(s_w_t_ms);
1193 old_cset_region_length());
1194 }
1195
1196 _constant_other_time_ms_seq->add(constant_other_time_ms(pause_time_ms));
1197
1198 _pending_cards_seq->add((double) _pending_cards);
1199 _rs_lengths_seq->add((double) _max_rs_lengths);
1200 }
1201
1202 collector_state()->set_in_marking_window(new_in_marking_window);
1203 collector_state()->set_in_marking_window_im(new_in_marking_window_im);
1204 _free_regions_at_end_of_collection = _g1->num_free_regions();
1205 // IHOP control wants to know the expected young gen length if it were not
1206 // restrained by the heap reserve. Using the actual length would make the
1207 // prediction too small and the limit the young gen every time we get to the
1208 // predicted target occupancy.
1209 size_t last_unrestrained_young_length = update_young_list_max_and_target_length();
1210 update_rs_lengths_prediction();
1211
1212 update_ihop_prediction(app_time_ms / 1000.0,
1213 _bytes_allocated_in_old_since_last_gc,
1214 last_unrestrained_young_length * HeapRegion::GrainBytes);
1215 _bytes_allocated_in_old_since_last_gc = 0;
1216
1217 // Note that _mmu_tracker->max_gc_time() returns the time in seconds.
1218 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0;
1219
1220 double scan_hcc_time_ms = average_time_ms(G1GCPhaseTimes::ScanHCC);
1221
1222 if (update_rs_time_goal_ms < scan_hcc_time_ms) {
1223 ergo_verbose2(ErgoTiming,
1224 "adjust concurrent refinement thresholds",
1225 ergo_format_reason("Scanning the HCC expected to take longer than Update RS time goal")
1226 ergo_format_ms("Update RS time goal")
1227 ergo_format_ms("Scan HCC time"),
1228 update_rs_time_goal_ms,
1229 scan_hcc_time_ms);
1230
1231 update_rs_time_goal_ms = 0;
1232 } else {
1233 update_rs_time_goal_ms -= scan_hcc_time_ms;
1234 }
1235 adjust_concurrent_refinement(average_time_ms(G1GCPhaseTimes::UpdateRS) - scan_hcc_time_ms,
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