Mon, 28 Jun 2010 14:13:17 -0400
6944166: G1: explicit GCs are not always handled correctly
Summary: G1 was not handling explicit GCs correctly in many ways. It does now. See the CR for the list of improvements contained in this changeset.
Reviewed-by: iveresov, ysr, johnc
ysr@777 | 1 | /* |
trims@1907 | 2 | * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
ysr@777 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
ysr@777 | 4 | * |
ysr@777 | 5 | * This code is free software; you can redistribute it and/or modify it |
ysr@777 | 6 | * under the terms of the GNU General Public License version 2 only, as |
ysr@777 | 7 | * published by the Free Software Foundation. |
ysr@777 | 8 | * |
ysr@777 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
ysr@777 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
ysr@777 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
ysr@777 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
ysr@777 | 13 | * accompanied this code). |
ysr@777 | 14 | * |
ysr@777 | 15 | * You should have received a copy of the GNU General Public License version |
ysr@777 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
ysr@777 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
ysr@777 | 18 | * |
trims@1907 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
trims@1907 | 20 | * or visit www.oracle.com if you need additional information or have any |
trims@1907 | 21 | * questions. |
ysr@777 | 22 | * |
ysr@777 | 23 | */ |
ysr@777 | 24 | |
ysr@777 | 25 | #include "incls/_precompiled.incl" |
ysr@777 | 26 | #include "incls/_g1CollectorPolicy.cpp.incl" |
ysr@777 | 27 | |
ysr@777 | 28 | #define PREDICTIONS_VERBOSE 0 |
ysr@777 | 29 | |
ysr@777 | 30 | // <NEW PREDICTION> |
ysr@777 | 31 | |
ysr@777 | 32 | // Different defaults for different number of GC threads |
ysr@777 | 33 | // They were chosen by running GCOld and SPECjbb on debris with different |
ysr@777 | 34 | // numbers of GC threads and choosing them based on the results |
ysr@777 | 35 | |
ysr@777 | 36 | // all the same |
ysr@777 | 37 | static double rs_length_diff_defaults[] = { |
ysr@777 | 38 | 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 |
ysr@777 | 39 | }; |
ysr@777 | 40 | |
ysr@777 | 41 | static double cost_per_card_ms_defaults[] = { |
ysr@777 | 42 | 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 |
ysr@777 | 43 | }; |
ysr@777 | 44 | |
ysr@777 | 45 | // all the same |
ysr@777 | 46 | static double fully_young_cards_per_entry_ratio_defaults[] = { |
ysr@777 | 47 | 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
ysr@777 | 48 | }; |
ysr@777 | 49 | |
ysr@777 | 50 | static double cost_per_entry_ms_defaults[] = { |
ysr@777 | 51 | 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 |
ysr@777 | 52 | }; |
ysr@777 | 53 | |
ysr@777 | 54 | static double cost_per_byte_ms_defaults[] = { |
ysr@777 | 55 | 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 |
ysr@777 | 56 | }; |
ysr@777 | 57 | |
ysr@777 | 58 | // these should be pretty consistent |
ysr@777 | 59 | static double constant_other_time_ms_defaults[] = { |
ysr@777 | 60 | 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 |
ysr@777 | 61 | }; |
ysr@777 | 62 | |
ysr@777 | 63 | |
ysr@777 | 64 | static double young_other_cost_per_region_ms_defaults[] = { |
ysr@777 | 65 | 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 |
ysr@777 | 66 | }; |
ysr@777 | 67 | |
ysr@777 | 68 | static double non_young_other_cost_per_region_ms_defaults[] = { |
ysr@777 | 69 | 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 |
ysr@777 | 70 | }; |
ysr@777 | 71 | |
ysr@777 | 72 | // </NEW PREDICTION> |
ysr@777 | 73 | |
ysr@777 | 74 | G1CollectorPolicy::G1CollectorPolicy() : |
ysr@777 | 75 | _parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1), |
ysr@777 | 76 | _n_pauses(0), |
ysr@777 | 77 | _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 78 | _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 79 | _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 80 | _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 81 | _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 82 | _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 83 | _all_pause_times_ms(new NumberSeq()), |
ysr@777 | 84 | _stop_world_start(0.0), |
ysr@777 | 85 | _all_stop_world_times_ms(new NumberSeq()), |
ysr@777 | 86 | _all_yield_times_ms(new NumberSeq()), |
ysr@777 | 87 | |
ysr@777 | 88 | _all_mod_union_times_ms(new NumberSeq()), |
ysr@777 | 89 | |
apetrusenko@1112 | 90 | _summary(new Summary()), |
apetrusenko@1112 | 91 | _abandoned_summary(new AbandonedSummary()), |
ysr@777 | 92 | |
johnc@1325 | 93 | #ifndef PRODUCT |
ysr@777 | 94 | _cur_clear_ct_time_ms(0.0), |
johnc@1325 | 95 | _min_clear_cc_time_ms(-1.0), |
johnc@1325 | 96 | _max_clear_cc_time_ms(-1.0), |
johnc@1325 | 97 | _cur_clear_cc_time_ms(0.0), |
johnc@1325 | 98 | _cum_clear_cc_time_ms(0.0), |
johnc@1325 | 99 | _num_cc_clears(0L), |
johnc@1325 | 100 | #endif |
ysr@777 | 101 | |
ysr@777 | 102 | _region_num_young(0), |
ysr@777 | 103 | _region_num_tenured(0), |
ysr@777 | 104 | _prev_region_num_young(0), |
ysr@777 | 105 | _prev_region_num_tenured(0), |
ysr@777 | 106 | |
ysr@777 | 107 | _aux_num(10), |
ysr@777 | 108 | _all_aux_times_ms(new NumberSeq[_aux_num]), |
ysr@777 | 109 | _cur_aux_start_times_ms(new double[_aux_num]), |
ysr@777 | 110 | _cur_aux_times_ms(new double[_aux_num]), |
ysr@777 | 111 | _cur_aux_times_set(new bool[_aux_num]), |
ysr@777 | 112 | |
ysr@777 | 113 | _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 114 | _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 115 | _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 116 | |
ysr@777 | 117 | // <NEW PREDICTION> |
ysr@777 | 118 | |
ysr@777 | 119 | _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 120 | _prev_collection_pause_end_ms(0.0), |
ysr@777 | 121 | _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 122 | _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 123 | _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 124 | _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 125 | _partially_young_cards_per_entry_ratio_seq( |
ysr@777 | 126 | new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 127 | _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 128 | _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 129 | _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 130 | _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 131 | _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 132 | _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 133 | _non_young_other_cost_per_region_ms_seq( |
ysr@777 | 134 | new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 135 | |
ysr@777 | 136 | _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 137 | _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 138 | _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 139 | |
johnc@1186 | 140 | _pause_time_target_ms((double) MaxGCPauseMillis), |
ysr@777 | 141 | |
ysr@777 | 142 | // </NEW PREDICTION> |
ysr@777 | 143 | |
ysr@777 | 144 | _in_young_gc_mode(false), |
ysr@777 | 145 | _full_young_gcs(true), |
ysr@777 | 146 | _full_young_pause_num(0), |
ysr@777 | 147 | _partial_young_pause_num(0), |
ysr@777 | 148 | |
ysr@777 | 149 | _during_marking(false), |
ysr@777 | 150 | _in_marking_window(false), |
ysr@777 | 151 | _in_marking_window_im(false), |
ysr@777 | 152 | |
ysr@777 | 153 | _known_garbage_ratio(0.0), |
ysr@777 | 154 | _known_garbage_bytes(0), |
ysr@777 | 155 | |
ysr@777 | 156 | _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), |
ysr@777 | 157 | |
ysr@777 | 158 | _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 159 | |
ysr@777 | 160 | _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 161 | _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), |
ysr@777 | 162 | |
ysr@777 | 163 | _recent_avg_pause_time_ratio(0.0), |
ysr@777 | 164 | _num_markings(0), |
ysr@777 | 165 | _n_marks(0), |
ysr@777 | 166 | _n_pauses_at_mark_end(0), |
ysr@777 | 167 | |
ysr@777 | 168 | _all_full_gc_times_ms(new NumberSeq()), |
ysr@777 | 169 | |
ysr@777 | 170 | // G1PausesBtwnConcMark defaults to -1 |
ysr@777 | 171 | // so the hack is to do the cast QQQ FIXME |
ysr@777 | 172 | _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), |
ysr@777 | 173 | _n_marks_since_last_pause(0), |
tonyp@1794 | 174 | _initiate_conc_mark_if_possible(false), |
tonyp@1794 | 175 | _during_initial_mark_pause(false), |
ysr@777 | 176 | _should_revert_to_full_young_gcs(false), |
ysr@777 | 177 | _last_full_young_gc(false), |
ysr@777 | 178 | |
ysr@777 | 179 | _prev_collection_pause_used_at_end_bytes(0), |
ysr@777 | 180 | |
ysr@777 | 181 | _collection_set(NULL), |
johnc@1829 | 182 | _collection_set_size(0), |
johnc@1829 | 183 | _collection_set_bytes_used_before(0), |
johnc@1829 | 184 | |
johnc@1829 | 185 | // Incremental CSet attributes |
johnc@1829 | 186 | _inc_cset_build_state(Inactive), |
johnc@1829 | 187 | _inc_cset_head(NULL), |
johnc@1829 | 188 | _inc_cset_tail(NULL), |
johnc@1829 | 189 | _inc_cset_size(0), |
johnc@1829 | 190 | _inc_cset_young_index(0), |
johnc@1829 | 191 | _inc_cset_bytes_used_before(0), |
johnc@1829 | 192 | _inc_cset_max_finger(NULL), |
johnc@1829 | 193 | _inc_cset_recorded_young_bytes(0), |
johnc@1829 | 194 | _inc_cset_recorded_rs_lengths(0), |
johnc@1829 | 195 | _inc_cset_predicted_elapsed_time_ms(0.0), |
johnc@1829 | 196 | _inc_cset_predicted_bytes_to_copy(0), |
johnc@1829 | 197 | |
ysr@777 | 198 | #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
ysr@777 | 199 | #pragma warning( disable:4355 ) // 'this' : used in base member initializer list |
ysr@777 | 200 | #endif // _MSC_VER |
ysr@777 | 201 | |
ysr@777 | 202 | _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", |
ysr@777 | 203 | G1YoungSurvRateNumRegionsSummary)), |
ysr@777 | 204 | _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", |
apetrusenko@980 | 205 | G1YoungSurvRateNumRegionsSummary)), |
ysr@777 | 206 | // add here any more surv rate groups |
apetrusenko@980 | 207 | _recorded_survivor_regions(0), |
apetrusenko@980 | 208 | _recorded_survivor_head(NULL), |
apetrusenko@980 | 209 | _recorded_survivor_tail(NULL), |
tonyp@1791 | 210 | _survivors_age_table(true), |
tonyp@1791 | 211 | |
tonyp@1791 | 212 | _gc_overhead_perc(0.0) |
apetrusenko@980 | 213 | |
ysr@777 | 214 | { |
tonyp@1377 | 215 | // Set up the region size and associated fields. Given that the |
tonyp@1377 | 216 | // policy is created before the heap, we have to set this up here, |
tonyp@1377 | 217 | // so it's done as soon as possible. |
tonyp@1377 | 218 | HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
iveresov@1696 | 219 | HeapRegionRemSet::setup_remset_size(); |
tonyp@1377 | 220 | |
apetrusenko@1826 | 221 | // Verify PLAB sizes |
apetrusenko@1826 | 222 | const uint region_size = HeapRegion::GrainWords; |
apetrusenko@1826 | 223 | if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
apetrusenko@1826 | 224 | char buffer[128]; |
apetrusenko@1826 | 225 | jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
apetrusenko@1826 | 226 | OldPLABSize > region_size ? "Old" : "Young", region_size); |
apetrusenko@1826 | 227 | vm_exit_during_initialization(buffer); |
apetrusenko@1826 | 228 | } |
apetrusenko@1826 | 229 | |
ysr@777 | 230 | _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
ysr@777 | 231 | _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; |
ysr@777 | 232 | |
tonyp@1966 | 233 | _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 234 | _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 235 | _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 236 | |
ysr@777 | 237 | _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 238 | _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; |
ysr@777 | 239 | |
ysr@777 | 240 | _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 241 | _par_last_scan_new_refs_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 242 | |
ysr@777 | 243 | _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 244 | |
ysr@777 | 245 | _par_last_termination_times_ms = new double[_parallel_gc_threads]; |
tonyp@1966 | 246 | _par_last_termination_attempts = new double[_parallel_gc_threads]; |
tonyp@1966 | 247 | _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; |
ysr@777 | 248 | |
ysr@777 | 249 | // start conservatively |
johnc@1186 | 250 | _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
ysr@777 | 251 | |
ysr@777 | 252 | // <NEW PREDICTION> |
ysr@777 | 253 | |
ysr@777 | 254 | int index; |
ysr@777 | 255 | if (ParallelGCThreads == 0) |
ysr@777 | 256 | index = 0; |
ysr@777 | 257 | else if (ParallelGCThreads > 8) |
ysr@777 | 258 | index = 7; |
ysr@777 | 259 | else |
ysr@777 | 260 | index = ParallelGCThreads - 1; |
ysr@777 | 261 | |
ysr@777 | 262 | _pending_card_diff_seq->add(0.0); |
ysr@777 | 263 | _rs_length_diff_seq->add(rs_length_diff_defaults[index]); |
ysr@777 | 264 | _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); |
ysr@777 | 265 | _fully_young_cards_per_entry_ratio_seq->add( |
ysr@777 | 266 | fully_young_cards_per_entry_ratio_defaults[index]); |
ysr@777 | 267 | _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
ysr@777 | 268 | _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); |
ysr@777 | 269 | _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); |
ysr@777 | 270 | _young_other_cost_per_region_ms_seq->add( |
ysr@777 | 271 | young_other_cost_per_region_ms_defaults[index]); |
ysr@777 | 272 | _non_young_other_cost_per_region_ms_seq->add( |
ysr@777 | 273 | non_young_other_cost_per_region_ms_defaults[index]); |
ysr@777 | 274 | |
ysr@777 | 275 | // </NEW PREDICTION> |
ysr@777 | 276 | |
tonyp@1965 | 277 | // Below, we might need to calculate the pause time target based on |
tonyp@1965 | 278 | // the pause interval. When we do so we are going to give G1 maximum |
tonyp@1965 | 279 | // flexibility and allow it to do pauses when it needs to. So, we'll |
tonyp@1965 | 280 | // arrange that the pause interval to be pause time target + 1 to |
tonyp@1965 | 281 | // ensure that a) the pause time target is maximized with respect to |
tonyp@1965 | 282 | // the pause interval and b) we maintain the invariant that pause |
tonyp@1965 | 283 | // time target < pause interval. If the user does not want this |
tonyp@1965 | 284 | // maximum flexibility, they will have to set the pause interval |
tonyp@1965 | 285 | // explicitly. |
tonyp@1965 | 286 | |
tonyp@1965 | 287 | // First make sure that, if either parameter is set, its value is |
tonyp@1965 | 288 | // reasonable. |
tonyp@1965 | 289 | if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
tonyp@1965 | 290 | if (MaxGCPauseMillis < 1) { |
tonyp@1965 | 291 | vm_exit_during_initialization("MaxGCPauseMillis should be " |
tonyp@1965 | 292 | "greater than 0"); |
tonyp@1965 | 293 | } |
tonyp@1965 | 294 | } |
tonyp@1965 | 295 | if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
tonyp@1965 | 296 | if (GCPauseIntervalMillis < 1) { |
tonyp@1965 | 297 | vm_exit_during_initialization("GCPauseIntervalMillis should be " |
tonyp@1965 | 298 | "greater than 0"); |
tonyp@1965 | 299 | } |
tonyp@1965 | 300 | } |
tonyp@1965 | 301 | |
tonyp@1965 | 302 | // Then, if the pause time target parameter was not set, set it to |
tonyp@1965 | 303 | // the default value. |
tonyp@1965 | 304 | if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
tonyp@1965 | 305 | if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
tonyp@1965 | 306 | // The default pause time target in G1 is 200ms |
tonyp@1965 | 307 | FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
tonyp@1965 | 308 | } else { |
tonyp@1965 | 309 | // We do not allow the pause interval to be set without the |
tonyp@1965 | 310 | // pause time target |
tonyp@1965 | 311 | vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
tonyp@1965 | 312 | "without setting MaxGCPauseMillis"); |
tonyp@1965 | 313 | } |
tonyp@1965 | 314 | } |
tonyp@1965 | 315 | |
tonyp@1965 | 316 | // Then, if the interval parameter was not set, set it according to |
tonyp@1965 | 317 | // the pause time target (this will also deal with the case when the |
tonyp@1965 | 318 | // pause time target is the default value). |
tonyp@1965 | 319 | if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
tonyp@1965 | 320 | FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
tonyp@1965 | 321 | } |
tonyp@1965 | 322 | |
tonyp@1965 | 323 | // Finally, make sure that the two parameters are consistent. |
tonyp@1965 | 324 | if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
tonyp@1965 | 325 | char buffer[256]; |
tonyp@1965 | 326 | jio_snprintf(buffer, 256, |
tonyp@1965 | 327 | "MaxGCPauseMillis (%u) should be less than " |
tonyp@1965 | 328 | "GCPauseIntervalMillis (%u)", |
tonyp@1965 | 329 | MaxGCPauseMillis, GCPauseIntervalMillis); |
tonyp@1965 | 330 | vm_exit_during_initialization(buffer); |
tonyp@1965 | 331 | } |
tonyp@1965 | 332 | |
tonyp@1965 | 333 | double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
johnc@1186 | 334 | double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
ysr@777 | 335 | _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
johnc@1186 | 336 | _sigma = (double) G1ConfidencePercent / 100.0; |
ysr@777 | 337 | |
ysr@777 | 338 | // start conservatively (around 50ms is about right) |
ysr@777 | 339 | _concurrent_mark_init_times_ms->add(0.05); |
ysr@777 | 340 | _concurrent_mark_remark_times_ms->add(0.05); |
ysr@777 | 341 | _concurrent_mark_cleanup_times_ms->add(0.20); |
ysr@777 | 342 | _tenuring_threshold = MaxTenuringThreshold; |
ysr@777 | 343 | |
tonyp@1717 | 344 | // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
tonyp@1717 | 345 | // fixed, then _max_survivor_regions will be calculated at |
johnc@1829 | 346 | // calculate_young_list_target_length during initialization |
tonyp@1717 | 347 | _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
apetrusenko@980 | 348 | |
tonyp@1791 | 349 | assert(GCTimeRatio > 0, |
tonyp@1791 | 350 | "we should have set it to a default value set_g1_gc_flags() " |
tonyp@1791 | 351 | "if a user set it to 0"); |
tonyp@1791 | 352 | _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); |
tonyp@1791 | 353 | |
ysr@777 | 354 | initialize_all(); |
ysr@777 | 355 | } |
ysr@777 | 356 | |
ysr@777 | 357 | // Increment "i", mod "len" |
ysr@777 | 358 | static void inc_mod(int& i, int len) { |
ysr@777 | 359 | i++; if (i == len) i = 0; |
ysr@777 | 360 | } |
ysr@777 | 361 | |
ysr@777 | 362 | void G1CollectorPolicy::initialize_flags() { |
ysr@777 | 363 | set_min_alignment(HeapRegion::GrainBytes); |
ysr@777 | 364 | set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); |
apetrusenko@982 | 365 | if (SurvivorRatio < 1) { |
apetrusenko@982 | 366 | vm_exit_during_initialization("Invalid survivor ratio specified"); |
apetrusenko@982 | 367 | } |
ysr@777 | 368 | CollectorPolicy::initialize_flags(); |
ysr@777 | 369 | } |
ysr@777 | 370 | |
tonyp@1720 | 371 | // The easiest way to deal with the parsing of the NewSize / |
tonyp@1720 | 372 | // MaxNewSize / etc. parameteres is to re-use the code in the |
tonyp@1720 | 373 | // TwoGenerationCollectorPolicy class. This is similar to what |
tonyp@1720 | 374 | // ParallelScavenge does with its GenerationSizer class (see |
tonyp@1720 | 375 | // ParallelScavengeHeap::initialize()). We might change this in the |
tonyp@1720 | 376 | // future, but it's a good start. |
tonyp@1720 | 377 | class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
tonyp@1720 | 378 | size_t size_to_region_num(size_t byte_size) { |
tonyp@1720 | 379 | return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
tonyp@1720 | 380 | } |
tonyp@1720 | 381 | |
tonyp@1720 | 382 | public: |
tonyp@1720 | 383 | G1YoungGenSizer() { |
tonyp@1720 | 384 | initialize_flags(); |
tonyp@1720 | 385 | initialize_size_info(); |
tonyp@1720 | 386 | } |
tonyp@1720 | 387 | |
tonyp@1720 | 388 | size_t min_young_region_num() { |
tonyp@1720 | 389 | return size_to_region_num(_min_gen0_size); |
tonyp@1720 | 390 | } |
tonyp@1720 | 391 | size_t initial_young_region_num() { |
tonyp@1720 | 392 | return size_to_region_num(_initial_gen0_size); |
tonyp@1720 | 393 | } |
tonyp@1720 | 394 | size_t max_young_region_num() { |
tonyp@1720 | 395 | return size_to_region_num(_max_gen0_size); |
tonyp@1720 | 396 | } |
tonyp@1720 | 397 | }; |
tonyp@1720 | 398 | |
ysr@777 | 399 | void G1CollectorPolicy::init() { |
ysr@777 | 400 | // Set aside an initial future to_space. |
ysr@777 | 401 | _g1 = G1CollectedHeap::heap(); |
ysr@777 | 402 | |
ysr@777 | 403 | assert(Heap_lock->owned_by_self(), "Locking discipline."); |
ysr@777 | 404 | |
apetrusenko@980 | 405 | initialize_gc_policy_counters(); |
apetrusenko@980 | 406 | |
ysr@777 | 407 | if (G1Gen) { |
ysr@777 | 408 | _in_young_gc_mode = true; |
ysr@777 | 409 | |
tonyp@1720 | 410 | G1YoungGenSizer sizer; |
tonyp@1720 | 411 | size_t initial_region_num = sizer.initial_young_region_num(); |
tonyp@1720 | 412 | |
tonyp@1720 | 413 | if (UseAdaptiveSizePolicy) { |
ysr@777 | 414 | set_adaptive_young_list_length(true); |
ysr@777 | 415 | _young_list_fixed_length = 0; |
ysr@777 | 416 | } else { |
ysr@777 | 417 | set_adaptive_young_list_length(false); |
tonyp@1720 | 418 | _young_list_fixed_length = initial_region_num; |
ysr@777 | 419 | } |
johnc@1829 | 420 | _free_regions_at_end_of_collection = _g1->free_regions(); |
johnc@1829 | 421 | calculate_young_list_min_length(); |
johnc@1829 | 422 | guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
johnc@1829 | 423 | calculate_young_list_target_length(); |
johnc@1829 | 424 | } else { |
ysr@777 | 425 | _young_list_fixed_length = 0; |
ysr@777 | 426 | _in_young_gc_mode = false; |
ysr@777 | 427 | } |
johnc@1829 | 428 | |
johnc@1829 | 429 | // We may immediately start allocating regions and placing them on the |
johnc@1829 | 430 | // collection set list. Initialize the per-collection set info |
johnc@1829 | 431 | start_incremental_cset_building(); |
ysr@777 | 432 | } |
ysr@777 | 433 | |
apetrusenko@980 | 434 | // Create the jstat counters for the policy. |
apetrusenko@980 | 435 | void G1CollectorPolicy::initialize_gc_policy_counters() |
apetrusenko@980 | 436 | { |
apetrusenko@980 | 437 | _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); |
apetrusenko@980 | 438 | } |
apetrusenko@980 | 439 | |
ysr@777 | 440 | void G1CollectorPolicy::calculate_young_list_min_length() { |
ysr@777 | 441 | _young_list_min_length = 0; |
ysr@777 | 442 | |
ysr@777 | 443 | if (!adaptive_young_list_length()) |
ysr@777 | 444 | return; |
ysr@777 | 445 | |
ysr@777 | 446 | if (_alloc_rate_ms_seq->num() > 3) { |
ysr@777 | 447 | double now_sec = os::elapsedTime(); |
ysr@777 | 448 | double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
ysr@777 | 449 | double alloc_rate_ms = predict_alloc_rate_ms(); |
ysr@777 | 450 | int min_regions = (int) ceil(alloc_rate_ms * when_ms); |
johnc@1829 | 451 | int current_region_num = (int) _g1->young_list()->length(); |
ysr@777 | 452 | _young_list_min_length = min_regions + current_region_num; |
ysr@777 | 453 | } |
ysr@777 | 454 | } |
ysr@777 | 455 | |
johnc@1829 | 456 | void G1CollectorPolicy::calculate_young_list_target_length() { |
ysr@777 | 457 | if (adaptive_young_list_length()) { |
ysr@777 | 458 | size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
johnc@1829 | 459 | calculate_young_list_target_length(rs_lengths); |
ysr@777 | 460 | } else { |
ysr@777 | 461 | if (full_young_gcs()) |
ysr@777 | 462 | _young_list_target_length = _young_list_fixed_length; |
ysr@777 | 463 | else |
ysr@777 | 464 | _young_list_target_length = _young_list_fixed_length / 2; |
johnc@1829 | 465 | |
ysr@777 | 466 | _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
ysr@777 | 467 | } |
apetrusenko@980 | 468 | calculate_survivors_policy(); |
ysr@777 | 469 | } |
ysr@777 | 470 | |
johnc@1829 | 471 | void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
ysr@777 | 472 | guarantee( adaptive_young_list_length(), "pre-condition" ); |
johnc@1829 | 473 | guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
ysr@777 | 474 | |
ysr@777 | 475 | double start_time_sec = os::elapsedTime(); |
tonyp@1717 | 476 | size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
ysr@777 | 477 | min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
ysr@777 | 478 | size_t reserve_regions = |
ysr@777 | 479 | (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); |
ysr@777 | 480 | |
ysr@777 | 481 | if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { |
ysr@777 | 482 | // we are in fully-young mode and there are free regions in the heap |
ysr@777 | 483 | |
apetrusenko@980 | 484 | double survivor_regions_evac_time = |
apetrusenko@980 | 485 | predict_survivor_regions_evac_time(); |
apetrusenko@980 | 486 | |
ysr@777 | 487 | double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
ysr@777 | 488 | size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
ysr@777 | 489 | size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
johnc@1829 | 490 | size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
apetrusenko@980 | 491 | double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
apetrusenko@980 | 492 | + survivor_regions_evac_time; |
johnc@1829 | 493 | |
ysr@777 | 494 | // the result |
ysr@777 | 495 | size_t final_young_length = 0; |
johnc@1829 | 496 | |
johnc@1829 | 497 | size_t init_free_regions = |
johnc@1829 | 498 | MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
johnc@1829 | 499 | |
johnc@1829 | 500 | // if we're still under the pause target... |
johnc@1829 | 501 | if (base_time_ms <= target_pause_time_ms) { |
johnc@1829 | 502 | // We make sure that the shortest young length that makes sense |
johnc@1829 | 503 | // fits within the target pause time. |
johnc@1829 | 504 | size_t min_young_length = 1; |
johnc@1829 | 505 | |
johnc@1829 | 506 | if (predict_will_fit(min_young_length, base_time_ms, |
johnc@1829 | 507 | init_free_regions, target_pause_time_ms)) { |
johnc@1829 | 508 | // The shortest young length will fit within the target pause time; |
johnc@1829 | 509 | // we'll now check whether the absolute maximum number of young |
johnc@1829 | 510 | // regions will fit in the target pause time. If not, we'll do |
johnc@1829 | 511 | // a binary search between min_young_length and max_young_length |
johnc@1829 | 512 | size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
johnc@1829 | 513 | size_t max_young_length = abs_max_young_length; |
johnc@1829 | 514 | |
johnc@1829 | 515 | if (max_young_length > min_young_length) { |
johnc@1829 | 516 | // Let's check if the initial max young length will fit within the |
johnc@1829 | 517 | // target pause. If so then there is no need to search for a maximal |
johnc@1829 | 518 | // young length - we'll return the initial maximum |
johnc@1829 | 519 | |
johnc@1829 | 520 | if (predict_will_fit(max_young_length, base_time_ms, |
johnc@1829 | 521 | init_free_regions, target_pause_time_ms)) { |
johnc@1829 | 522 | // The maximum young length will satisfy the target pause time. |
johnc@1829 | 523 | // We are done so set min young length to this maximum length. |
johnc@1829 | 524 | // The code after the loop will then set final_young_length using |
johnc@1829 | 525 | // the value cached in the minimum length. |
johnc@1829 | 526 | min_young_length = max_young_length; |
johnc@1829 | 527 | } else { |
johnc@1829 | 528 | // The maximum possible number of young regions will not fit within |
johnc@1829 | 529 | // the target pause time so let's search.... |
johnc@1829 | 530 | |
johnc@1829 | 531 | size_t diff = (max_young_length - min_young_length) / 2; |
johnc@1829 | 532 | max_young_length = min_young_length + diff; |
johnc@1829 | 533 | |
johnc@1829 | 534 | while (max_young_length > min_young_length) { |
johnc@1829 | 535 | if (predict_will_fit(max_young_length, base_time_ms, |
johnc@1829 | 536 | init_free_regions, target_pause_time_ms)) { |
johnc@1829 | 537 | |
johnc@1829 | 538 | // The current max young length will fit within the target |
johnc@1829 | 539 | // pause time. Note we do not exit the loop here. By setting |
johnc@1829 | 540 | // min = max, and then increasing the max below means that |
johnc@1829 | 541 | // we will continue searching for an upper bound in the |
johnc@1829 | 542 | // range [max..max+diff] |
johnc@1829 | 543 | min_young_length = max_young_length; |
johnc@1829 | 544 | } |
johnc@1829 | 545 | diff = (max_young_length - min_young_length) / 2; |
johnc@1829 | 546 | max_young_length = min_young_length + diff; |
johnc@1829 | 547 | } |
johnc@1829 | 548 | // the above loop found a maximal young length that will fit |
johnc@1829 | 549 | // within the target pause time. |
johnc@1829 | 550 | } |
johnc@1829 | 551 | assert(min_young_length <= abs_max_young_length, "just checking"); |
johnc@1829 | 552 | } |
johnc@1829 | 553 | final_young_length = min_young_length; |
johnc@1829 | 554 | } |
ysr@777 | 555 | } |
johnc@1829 | 556 | // and we're done! |
ysr@777 | 557 | |
ysr@777 | 558 | // we should have at least one region in the target young length |
apetrusenko@980 | 559 | _young_list_target_length = |
apetrusenko@980 | 560 | MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); |
ysr@777 | 561 | |
ysr@777 | 562 | // let's keep an eye of how long we spend on this calculation |
ysr@777 | 563 | // right now, I assume that we'll print it when we need it; we |
ysr@777 | 564 | // should really adde it to the breakdown of a pause |
ysr@777 | 565 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 566 | double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; |
ysr@777 | 567 | |
johnc@1829 | 568 | #ifdef TRACE_CALC_YOUNG_LENGTH |
ysr@777 | 569 | // leave this in for debugging, just in case |
johnc@1829 | 570 | gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
johnc@1829 | 571 | "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
ysr@777 | 572 | target_pause_time_ms, |
johnc@1829 | 573 | _young_list_target_length |
ysr@777 | 574 | elapsed_time_ms, |
ysr@777 | 575 | full_young_gcs() ? "full" : "partial", |
tonyp@1794 | 576 | during_initial_mark_pause() ? " i-m" : "", |
apetrusenko@980 | 577 | _in_marking_window, |
apetrusenko@980 | 578 | _in_marking_window_im); |
johnc@1829 | 579 | #endif // TRACE_CALC_YOUNG_LENGTH |
ysr@777 | 580 | |
ysr@777 | 581 | if (_young_list_target_length < _young_list_min_length) { |
johnc@1829 | 582 | // bummer; this means that, if we do a pause when the maximal |
johnc@1829 | 583 | // length dictates, we'll violate the pause spacing target (the |
ysr@777 | 584 | // min length was calculate based on the application's current |
ysr@777 | 585 | // alloc rate); |
ysr@777 | 586 | |
ysr@777 | 587 | // so, we have to bite the bullet, and allocate the minimum |
ysr@777 | 588 | // number. We'll violate our target, but we just can't meet it. |
ysr@777 | 589 | |
johnc@1829 | 590 | #ifdef TRACE_CALC_YOUNG_LENGTH |
ysr@777 | 591 | // leave this in for debugging, just in case |
ysr@777 | 592 | gclog_or_tty->print_cr("adjusted target length from " |
johnc@1829 | 593 | SIZE_FORMAT " to " SIZE_FORMAT, |
johnc@1829 | 594 | _young_list_target_length, _young_list_min_length); |
johnc@1829 | 595 | #endif // TRACE_CALC_YOUNG_LENGTH |
johnc@1829 | 596 | |
johnc@1829 | 597 | _young_list_target_length = _young_list_min_length; |
ysr@777 | 598 | } |
ysr@777 | 599 | } else { |
ysr@777 | 600 | // we are in a partially-young mode or we've run out of regions (due |
ysr@777 | 601 | // to evacuation failure) |
ysr@777 | 602 | |
johnc@1829 | 603 | #ifdef TRACE_CALC_YOUNG_LENGTH |
ysr@777 | 604 | // leave this in for debugging, just in case |
ysr@777 | 605 | gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT |
johnc@1829 | 606 | _young_list_min_length); |
johnc@1829 | 607 | #endif // TRACE_CALC_YOUNG_LENGTH |
johnc@1829 | 608 | // we'll do the pause as soon as possible by choosing the minimum |
ysr@777 | 609 | _young_list_target_length = |
ysr@777 | 610 | MAX2(_young_list_min_length, (size_t) 1); |
ysr@777 | 611 | } |
ysr@777 | 612 | |
ysr@777 | 613 | _rs_lengths_prediction = rs_lengths; |
ysr@777 | 614 | } |
ysr@777 | 615 | |
johnc@1829 | 616 | // This is used by: calculate_young_list_target_length(rs_length). It |
johnc@1829 | 617 | // returns true iff: |
johnc@1829 | 618 | // the predicted pause time for the given young list will not overflow |
johnc@1829 | 619 | // the target pause time |
johnc@1829 | 620 | // and: |
johnc@1829 | 621 | // the predicted amount of surviving data will not overflow the |
johnc@1829 | 622 | // the amount of free space available for survivor regions. |
johnc@1829 | 623 | // |
ysr@777 | 624 | bool |
johnc@1829 | 625 | G1CollectorPolicy::predict_will_fit(size_t young_length, |
johnc@1829 | 626 | double base_time_ms, |
johnc@1829 | 627 | size_t init_free_regions, |
johnc@1829 | 628 | double target_pause_time_ms) { |
ysr@777 | 629 | |
ysr@777 | 630 | if (young_length >= init_free_regions) |
ysr@777 | 631 | // end condition 1: not enough space for the young regions |
ysr@777 | 632 | return false; |
ysr@777 | 633 | |
ysr@777 | 634 | double accum_surv_rate_adj = 0.0; |
ysr@777 | 635 | double accum_surv_rate = |
ysr@777 | 636 | accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; |
johnc@1829 | 637 | |
ysr@777 | 638 | size_t bytes_to_copy = |
ysr@777 | 639 | (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
johnc@1829 | 640 | |
ysr@777 | 641 | double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
johnc@1829 | 642 | |
ysr@777 | 643 | double young_other_time_ms = |
johnc@1829 | 644 | predict_young_other_time_ms(young_length); |
johnc@1829 | 645 | |
ysr@777 | 646 | double pause_time_ms = |
johnc@1829 | 647 | base_time_ms + copy_time_ms + young_other_time_ms; |
ysr@777 | 648 | |
ysr@777 | 649 | if (pause_time_ms > target_pause_time_ms) |
ysr@777 | 650 | // end condition 2: over the target pause time |
ysr@777 | 651 | return false; |
ysr@777 | 652 | |
ysr@777 | 653 | size_t free_bytes = |
ysr@777 | 654 | (init_free_regions - young_length) * HeapRegion::GrainBytes; |
ysr@777 | 655 | |
ysr@777 | 656 | if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) |
ysr@777 | 657 | // end condition 3: out of to-space (conservatively) |
ysr@777 | 658 | return false; |
ysr@777 | 659 | |
ysr@777 | 660 | // success! |
ysr@777 | 661 | return true; |
ysr@777 | 662 | } |
ysr@777 | 663 | |
apetrusenko@980 | 664 | double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
apetrusenko@980 | 665 | double survivor_regions_evac_time = 0.0; |
apetrusenko@980 | 666 | for (HeapRegion * r = _recorded_survivor_head; |
apetrusenko@980 | 667 | r != NULL && r != _recorded_survivor_tail->get_next_young_region(); |
apetrusenko@980 | 668 | r = r->get_next_young_region()) { |
apetrusenko@980 | 669 | survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); |
apetrusenko@980 | 670 | } |
apetrusenko@980 | 671 | return survivor_regions_evac_time; |
apetrusenko@980 | 672 | } |
apetrusenko@980 | 673 | |
ysr@777 | 674 | void G1CollectorPolicy::check_prediction_validity() { |
ysr@777 | 675 | guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
ysr@777 | 676 | |
johnc@1829 | 677 | size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
ysr@777 | 678 | if (rs_lengths > _rs_lengths_prediction) { |
ysr@777 | 679 | // add 10% to avoid having to recalculate often |
ysr@777 | 680 | size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; |
johnc@1829 | 681 | calculate_young_list_target_length(rs_lengths_prediction); |
ysr@777 | 682 | } |
ysr@777 | 683 | } |
ysr@777 | 684 | |
ysr@777 | 685 | HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
ysr@777 | 686 | bool is_tlab, |
ysr@777 | 687 | bool* gc_overhead_limit_was_exceeded) { |
ysr@777 | 688 | guarantee(false, "Not using this policy feature yet."); |
ysr@777 | 689 | return NULL; |
ysr@777 | 690 | } |
ysr@777 | 691 | |
ysr@777 | 692 | // This method controls how a collector handles one or more |
ysr@777 | 693 | // of its generations being fully allocated. |
ysr@777 | 694 | HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, |
ysr@777 | 695 | bool is_tlab) { |
ysr@777 | 696 | guarantee(false, "Not using this policy feature yet."); |
ysr@777 | 697 | return NULL; |
ysr@777 | 698 | } |
ysr@777 | 699 | |
ysr@777 | 700 | |
ysr@777 | 701 | #ifndef PRODUCT |
ysr@777 | 702 | bool G1CollectorPolicy::verify_young_ages() { |
johnc@1829 | 703 | HeapRegion* head = _g1->young_list()->first_region(); |
ysr@777 | 704 | return |
ysr@777 | 705 | verify_young_ages(head, _short_lived_surv_rate_group); |
ysr@777 | 706 | // also call verify_young_ages on any additional surv rate groups |
ysr@777 | 707 | } |
ysr@777 | 708 | |
ysr@777 | 709 | bool |
ysr@777 | 710 | G1CollectorPolicy::verify_young_ages(HeapRegion* head, |
ysr@777 | 711 | SurvRateGroup *surv_rate_group) { |
ysr@777 | 712 | guarantee( surv_rate_group != NULL, "pre-condition" ); |
ysr@777 | 713 | |
ysr@777 | 714 | const char* name = surv_rate_group->name(); |
ysr@777 | 715 | bool ret = true; |
ysr@777 | 716 | int prev_age = -1; |
ysr@777 | 717 | |
ysr@777 | 718 | for (HeapRegion* curr = head; |
ysr@777 | 719 | curr != NULL; |
ysr@777 | 720 | curr = curr->get_next_young_region()) { |
ysr@777 | 721 | SurvRateGroup* group = curr->surv_rate_group(); |
ysr@777 | 722 | if (group == NULL && !curr->is_survivor()) { |
ysr@777 | 723 | gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); |
ysr@777 | 724 | ret = false; |
ysr@777 | 725 | } |
ysr@777 | 726 | |
ysr@777 | 727 | if (surv_rate_group == group) { |
ysr@777 | 728 | int age = curr->age_in_surv_rate_group(); |
ysr@777 | 729 | |
ysr@777 | 730 | if (age < 0) { |
ysr@777 | 731 | gclog_or_tty->print_cr("## %s: encountered negative age", name); |
ysr@777 | 732 | ret = false; |
ysr@777 | 733 | } |
ysr@777 | 734 | |
ysr@777 | 735 | if (age <= prev_age) { |
ysr@777 | 736 | gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " |
ysr@777 | 737 | "(%d, %d)", name, age, prev_age); |
ysr@777 | 738 | ret = false; |
ysr@777 | 739 | } |
ysr@777 | 740 | prev_age = age; |
ysr@777 | 741 | } |
ysr@777 | 742 | } |
ysr@777 | 743 | |
ysr@777 | 744 | return ret; |
ysr@777 | 745 | } |
ysr@777 | 746 | #endif // PRODUCT |
ysr@777 | 747 | |
ysr@777 | 748 | void G1CollectorPolicy::record_full_collection_start() { |
ysr@777 | 749 | _cur_collection_start_sec = os::elapsedTime(); |
ysr@777 | 750 | // Release the future to-space so that it is available for compaction into. |
ysr@777 | 751 | _g1->set_full_collection(); |
ysr@777 | 752 | } |
ysr@777 | 753 | |
ysr@777 | 754 | void G1CollectorPolicy::record_full_collection_end() { |
ysr@777 | 755 | // Consider this like a collection pause for the purposes of allocation |
ysr@777 | 756 | // since last pause. |
ysr@777 | 757 | double end_sec = os::elapsedTime(); |
ysr@777 | 758 | double full_gc_time_sec = end_sec - _cur_collection_start_sec; |
ysr@777 | 759 | double full_gc_time_ms = full_gc_time_sec * 1000.0; |
ysr@777 | 760 | |
ysr@777 | 761 | _all_full_gc_times_ms->add(full_gc_time_ms); |
ysr@777 | 762 | |
tonyp@1030 | 763 | update_recent_gc_times(end_sec, full_gc_time_ms); |
ysr@777 | 764 | |
ysr@777 | 765 | _g1->clear_full_collection(); |
ysr@777 | 766 | |
ysr@777 | 767 | // "Nuke" the heuristics that control the fully/partially young GC |
ysr@777 | 768 | // transitions and make sure we start with fully young GCs after the |
ysr@777 | 769 | // Full GC. |
ysr@777 | 770 | set_full_young_gcs(true); |
ysr@777 | 771 | _last_full_young_gc = false; |
ysr@777 | 772 | _should_revert_to_full_young_gcs = false; |
tonyp@1794 | 773 | clear_initiate_conc_mark_if_possible(); |
tonyp@1794 | 774 | clear_during_initial_mark_pause(); |
ysr@777 | 775 | _known_garbage_bytes = 0; |
ysr@777 | 776 | _known_garbage_ratio = 0.0; |
ysr@777 | 777 | _in_marking_window = false; |
ysr@777 | 778 | _in_marking_window_im = false; |
ysr@777 | 779 | |
ysr@777 | 780 | _short_lived_surv_rate_group->start_adding_regions(); |
ysr@777 | 781 | // also call this on any additional surv rate groups |
ysr@777 | 782 | |
apetrusenko@980 | 783 | record_survivor_regions(0, NULL, NULL); |
apetrusenko@980 | 784 | |
ysr@777 | 785 | _prev_region_num_young = _region_num_young; |
ysr@777 | 786 | _prev_region_num_tenured = _region_num_tenured; |
ysr@777 | 787 | |
ysr@777 | 788 | _free_regions_at_end_of_collection = _g1->free_regions(); |
apetrusenko@980 | 789 | // Reset survivors SurvRateGroup. |
apetrusenko@980 | 790 | _survivor_surv_rate_group->reset(); |
ysr@777 | 791 | calculate_young_list_min_length(); |
johnc@1829 | 792 | calculate_young_list_target_length(); |
ysr@777 | 793 | } |
ysr@777 | 794 | |
ysr@777 | 795 | void G1CollectorPolicy::record_before_bytes(size_t bytes) { |
ysr@777 | 796 | _bytes_in_to_space_before_gc += bytes; |
ysr@777 | 797 | } |
ysr@777 | 798 | |
ysr@777 | 799 | void G1CollectorPolicy::record_after_bytes(size_t bytes) { |
ysr@777 | 800 | _bytes_in_to_space_after_gc += bytes; |
ysr@777 | 801 | } |
ysr@777 | 802 | |
ysr@777 | 803 | void G1CollectorPolicy::record_stop_world_start() { |
ysr@777 | 804 | _stop_world_start = os::elapsedTime(); |
ysr@777 | 805 | } |
ysr@777 | 806 | |
ysr@777 | 807 | void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, |
ysr@777 | 808 | size_t start_used) { |
ysr@777 | 809 | if (PrintGCDetails) { |
ysr@777 | 810 | gclog_or_tty->stamp(PrintGCTimeStamps); |
ysr@777 | 811 | gclog_or_tty->print("[GC pause"); |
ysr@777 | 812 | if (in_young_gc_mode()) |
ysr@777 | 813 | gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
ysr@777 | 814 | } |
ysr@777 | 815 | |
ysr@777 | 816 | assert(_g1->used_regions() == _g1->recalculate_used_regions(), |
ysr@777 | 817 | "sanity"); |
tonyp@1071 | 818 | assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
ysr@777 | 819 | |
ysr@777 | 820 | double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; |
ysr@777 | 821 | _all_stop_world_times_ms->add(s_w_t_ms); |
ysr@777 | 822 | _stop_world_start = 0.0; |
ysr@777 | 823 | |
ysr@777 | 824 | _cur_collection_start_sec = start_time_sec; |
ysr@777 | 825 | _cur_collection_pause_used_at_start_bytes = start_used; |
ysr@777 | 826 | _cur_collection_pause_used_regions_at_start = _g1->used_regions(); |
ysr@777 | 827 | _pending_cards = _g1->pending_card_num(); |
ysr@777 | 828 | _max_pending_cards = _g1->max_pending_card_num(); |
ysr@777 | 829 | |
ysr@777 | 830 | _bytes_in_to_space_before_gc = 0; |
ysr@777 | 831 | _bytes_in_to_space_after_gc = 0; |
ysr@777 | 832 | _bytes_in_collection_set_before_gc = 0; |
ysr@777 | 833 | |
ysr@777 | 834 | #ifdef DEBUG |
ysr@777 | 835 | // initialise these to something well known so that we can spot |
ysr@777 | 836 | // if they are not set properly |
ysr@777 | 837 | |
ysr@777 | 838 | for (int i = 0; i < _parallel_gc_threads; ++i) { |
tonyp@1966 | 839 | _par_last_gc_worker_start_times_ms[i] = -1234.0; |
tonyp@1966 | 840 | _par_last_ext_root_scan_times_ms[i] = -1234.0; |
tonyp@1966 | 841 | _par_last_mark_stack_scan_times_ms[i] = -1234.0; |
tonyp@1966 | 842 | _par_last_update_rs_times_ms[i] = -1234.0; |
tonyp@1966 | 843 | _par_last_update_rs_processed_buffers[i] = -1234.0; |
tonyp@1966 | 844 | _par_last_scan_rs_times_ms[i] = -1234.0; |
tonyp@1966 | 845 | _par_last_scan_new_refs_times_ms[i] = -1234.0; |
tonyp@1966 | 846 | _par_last_obj_copy_times_ms[i] = -1234.0; |
tonyp@1966 | 847 | _par_last_termination_times_ms[i] = -1234.0; |
tonyp@1966 | 848 | _par_last_termination_attempts[i] = -1234.0; |
tonyp@1966 | 849 | _par_last_gc_worker_end_times_ms[i] = -1234.0; |
ysr@777 | 850 | } |
ysr@777 | 851 | #endif |
ysr@777 | 852 | |
ysr@777 | 853 | for (int i = 0; i < _aux_num; ++i) { |
ysr@777 | 854 | _cur_aux_times_ms[i] = 0.0; |
ysr@777 | 855 | _cur_aux_times_set[i] = false; |
ysr@777 | 856 | } |
ysr@777 | 857 | |
ysr@777 | 858 | _satb_drain_time_set = false; |
ysr@777 | 859 | _last_satb_drain_processed_buffers = -1; |
ysr@777 | 860 | |
ysr@777 | 861 | if (in_young_gc_mode()) |
ysr@777 | 862 | _last_young_gc_full = false; |
ysr@777 | 863 | |
ysr@777 | 864 | // do that for any other surv rate groups |
ysr@777 | 865 | _short_lived_surv_rate_group->stop_adding_regions(); |
tonyp@1717 | 866 | _survivors_age_table.clear(); |
apetrusenko@980 | 867 | |
ysr@777 | 868 | assert( verify_young_ages(), "region age verification" ); |
ysr@777 | 869 | } |
ysr@777 | 870 | |
ysr@777 | 871 | void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { |
ysr@777 | 872 | _mark_closure_time_ms = mark_closure_time_ms; |
ysr@777 | 873 | } |
ysr@777 | 874 | |
ysr@777 | 875 | void G1CollectorPolicy::record_concurrent_mark_init_start() { |
ysr@777 | 876 | _mark_init_start_sec = os::elapsedTime(); |
ysr@777 | 877 | guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); |
ysr@777 | 878 | } |
ysr@777 | 879 | |
ysr@777 | 880 | void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double |
ysr@777 | 881 | mark_init_elapsed_time_ms) { |
ysr@777 | 882 | _during_marking = true; |
tonyp@1794 | 883 | assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
tonyp@1794 | 884 | clear_during_initial_mark_pause(); |
ysr@777 | 885 | _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
ysr@777 | 886 | } |
ysr@777 | 887 | |
ysr@777 | 888 | void G1CollectorPolicy::record_concurrent_mark_init_end() { |
ysr@777 | 889 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 890 | double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; |
ysr@777 | 891 | _concurrent_mark_init_times_ms->add(elapsed_time_ms); |
ysr@777 | 892 | record_concurrent_mark_init_end_pre(elapsed_time_ms); |
ysr@777 | 893 | |
ysr@777 | 894 | _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); |
ysr@777 | 895 | } |
ysr@777 | 896 | |
ysr@777 | 897 | void G1CollectorPolicy::record_concurrent_mark_remark_start() { |
ysr@777 | 898 | _mark_remark_start_sec = os::elapsedTime(); |
ysr@777 | 899 | _during_marking = false; |
ysr@777 | 900 | } |
ysr@777 | 901 | |
ysr@777 | 902 | void G1CollectorPolicy::record_concurrent_mark_remark_end() { |
ysr@777 | 903 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 904 | double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; |
ysr@777 | 905 | _concurrent_mark_remark_times_ms->add(elapsed_time_ms); |
ysr@777 | 906 | _cur_mark_stop_world_time_ms += elapsed_time_ms; |
ysr@777 | 907 | _prev_collection_pause_end_ms += elapsed_time_ms; |
ysr@777 | 908 | |
ysr@777 | 909 | _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); |
ysr@777 | 910 | } |
ysr@777 | 911 | |
ysr@777 | 912 | void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { |
ysr@777 | 913 | _mark_cleanup_start_sec = os::elapsedTime(); |
ysr@777 | 914 | } |
ysr@777 | 915 | |
ysr@777 | 916 | void |
ysr@777 | 917 | G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, |
ysr@777 | 918 | size_t max_live_bytes) { |
ysr@777 | 919 | record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); |
ysr@777 | 920 | record_concurrent_mark_cleanup_end_work2(); |
ysr@777 | 921 | } |
ysr@777 | 922 | |
ysr@777 | 923 | void |
ysr@777 | 924 | G1CollectorPolicy:: |
ysr@777 | 925 | record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, |
ysr@777 | 926 | size_t max_live_bytes) { |
ysr@777 | 927 | if (_n_marks < 2) _n_marks++; |
ysr@777 | 928 | if (G1PolicyVerbose > 0) |
ysr@777 | 929 | gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " |
ysr@777 | 930 | " (of " SIZE_FORMAT " MB heap).", |
ysr@777 | 931 | max_live_bytes/M, _g1->capacity()/M); |
ysr@777 | 932 | } |
ysr@777 | 933 | |
ysr@777 | 934 | // The important thing about this is that it includes "os::elapsedTime". |
ysr@777 | 935 | void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { |
ysr@777 | 936 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 937 | double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; |
ysr@777 | 938 | _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); |
ysr@777 | 939 | _cur_mark_stop_world_time_ms += elapsed_time_ms; |
ysr@777 | 940 | _prev_collection_pause_end_ms += elapsed_time_ms; |
ysr@777 | 941 | |
ysr@777 | 942 | _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); |
ysr@777 | 943 | |
ysr@777 | 944 | _num_markings++; |
ysr@777 | 945 | |
ysr@777 | 946 | // We did a marking, so reset the "since_last_mark" variables. |
ysr@777 | 947 | double considerConcMarkCost = 1.0; |
ysr@777 | 948 | // If there are available processors, concurrent activity is free... |
ysr@777 | 949 | if (Threads::number_of_non_daemon_threads() * 2 < |
ysr@777 | 950 | os::active_processor_count()) { |
ysr@777 | 951 | considerConcMarkCost = 0.0; |
ysr@777 | 952 | } |
ysr@777 | 953 | _n_pauses_at_mark_end = _n_pauses; |
ysr@777 | 954 | _n_marks_since_last_pause++; |
ysr@777 | 955 | } |
ysr@777 | 956 | |
ysr@777 | 957 | void |
ysr@777 | 958 | G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
ysr@777 | 959 | if (in_young_gc_mode()) { |
ysr@777 | 960 | _should_revert_to_full_young_gcs = false; |
ysr@777 | 961 | _last_full_young_gc = true; |
ysr@777 | 962 | _in_marking_window = false; |
ysr@777 | 963 | if (adaptive_young_list_length()) |
johnc@1829 | 964 | calculate_young_list_target_length(); |
ysr@777 | 965 | } |
ysr@777 | 966 | } |
ysr@777 | 967 | |
ysr@777 | 968 | void G1CollectorPolicy::record_concurrent_pause() { |
ysr@777 | 969 | if (_stop_world_start > 0.0) { |
ysr@777 | 970 | double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; |
ysr@777 | 971 | _all_yield_times_ms->add(yield_ms); |
ysr@777 | 972 | } |
ysr@777 | 973 | } |
ysr@777 | 974 | |
ysr@777 | 975 | void G1CollectorPolicy::record_concurrent_pause_end() { |
ysr@777 | 976 | } |
ysr@777 | 977 | |
ysr@777 | 978 | void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { |
ysr@777 | 979 | _cur_CH_strong_roots_end_sec = os::elapsedTime(); |
ysr@777 | 980 | _cur_CH_strong_roots_dur_ms = |
ysr@777 | 981 | (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; |
ysr@777 | 982 | } |
ysr@777 | 983 | |
ysr@777 | 984 | void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { |
ysr@777 | 985 | _cur_G1_strong_roots_end_sec = os::elapsedTime(); |
ysr@777 | 986 | _cur_G1_strong_roots_dur_ms = |
ysr@777 | 987 | (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; |
ysr@777 | 988 | } |
ysr@777 | 989 | |
ysr@777 | 990 | template<class T> |
ysr@777 | 991 | T sum_of(T* sum_arr, int start, int n, int N) { |
ysr@777 | 992 | T sum = (T)0; |
ysr@777 | 993 | for (int i = 0; i < n; i++) { |
ysr@777 | 994 | int j = (start + i) % N; |
ysr@777 | 995 | sum += sum_arr[j]; |
ysr@777 | 996 | } |
ysr@777 | 997 | return sum; |
ysr@777 | 998 | } |
ysr@777 | 999 | |
tonyp@1966 | 1000 | void G1CollectorPolicy::print_par_stats(int level, |
tonyp@1966 | 1001 | const char* str, |
tonyp@1966 | 1002 | double* data, |
ysr@777 | 1003 | bool summary) { |
ysr@777 | 1004 | double min = data[0], max = data[0]; |
ysr@777 | 1005 | double total = 0.0; |
ysr@777 | 1006 | int j; |
ysr@777 | 1007 | for (j = 0; j < level; ++j) |
ysr@777 | 1008 | gclog_or_tty->print(" "); |
ysr@777 | 1009 | gclog_or_tty->print("[%s (ms):", str); |
ysr@777 | 1010 | for (uint i = 0; i < ParallelGCThreads; ++i) { |
ysr@777 | 1011 | double val = data[i]; |
ysr@777 | 1012 | if (val < min) |
ysr@777 | 1013 | min = val; |
ysr@777 | 1014 | if (val > max) |
ysr@777 | 1015 | max = val; |
ysr@777 | 1016 | total += val; |
ysr@777 | 1017 | gclog_or_tty->print(" %3.1lf", val); |
ysr@777 | 1018 | } |
ysr@777 | 1019 | if (summary) { |
ysr@777 | 1020 | gclog_or_tty->print_cr(""); |
ysr@777 | 1021 | double avg = total / (double) ParallelGCThreads; |
ysr@777 | 1022 | gclog_or_tty->print(" "); |
ysr@777 | 1023 | for (j = 0; j < level; ++j) |
ysr@777 | 1024 | gclog_or_tty->print(" "); |
ysr@777 | 1025 | gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", |
ysr@777 | 1026 | avg, min, max); |
ysr@777 | 1027 | } |
ysr@777 | 1028 | gclog_or_tty->print_cr("]"); |
ysr@777 | 1029 | } |
ysr@777 | 1030 | |
tonyp@1966 | 1031 | void G1CollectorPolicy::print_par_sizes(int level, |
tonyp@1966 | 1032 | const char* str, |
tonyp@1966 | 1033 | double* data, |
tonyp@1966 | 1034 | bool summary) { |
ysr@777 | 1035 | double min = data[0], max = data[0]; |
ysr@777 | 1036 | double total = 0.0; |
ysr@777 | 1037 | int j; |
ysr@777 | 1038 | for (j = 0; j < level; ++j) |
ysr@777 | 1039 | gclog_or_tty->print(" "); |
ysr@777 | 1040 | gclog_or_tty->print("[%s :", str); |
ysr@777 | 1041 | for (uint i = 0; i < ParallelGCThreads; ++i) { |
ysr@777 | 1042 | double val = data[i]; |
ysr@777 | 1043 | if (val < min) |
ysr@777 | 1044 | min = val; |
ysr@777 | 1045 | if (val > max) |
ysr@777 | 1046 | max = val; |
ysr@777 | 1047 | total += val; |
ysr@777 | 1048 | gclog_or_tty->print(" %d", (int) val); |
ysr@777 | 1049 | } |
ysr@777 | 1050 | if (summary) { |
ysr@777 | 1051 | gclog_or_tty->print_cr(""); |
ysr@777 | 1052 | double avg = total / (double) ParallelGCThreads; |
ysr@777 | 1053 | gclog_or_tty->print(" "); |
ysr@777 | 1054 | for (j = 0; j < level; ++j) |
ysr@777 | 1055 | gclog_or_tty->print(" "); |
ysr@777 | 1056 | gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", |
ysr@777 | 1057 | (int)total, (int)avg, (int)min, (int)max); |
ysr@777 | 1058 | } |
ysr@777 | 1059 | gclog_or_tty->print_cr("]"); |
ysr@777 | 1060 | } |
ysr@777 | 1061 | |
ysr@777 | 1062 | void G1CollectorPolicy::print_stats (int level, |
ysr@777 | 1063 | const char* str, |
ysr@777 | 1064 | double value) { |
ysr@777 | 1065 | for (int j = 0; j < level; ++j) |
ysr@777 | 1066 | gclog_or_tty->print(" "); |
ysr@777 | 1067 | gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); |
ysr@777 | 1068 | } |
ysr@777 | 1069 | |
ysr@777 | 1070 | void G1CollectorPolicy::print_stats (int level, |
ysr@777 | 1071 | const char* str, |
ysr@777 | 1072 | int value) { |
ysr@777 | 1073 | for (int j = 0; j < level; ++j) |
ysr@777 | 1074 | gclog_or_tty->print(" "); |
ysr@777 | 1075 | gclog_or_tty->print_cr("[%s: %d]", str, value); |
ysr@777 | 1076 | } |
ysr@777 | 1077 | |
ysr@777 | 1078 | double G1CollectorPolicy::avg_value (double* data) { |
ysr@777 | 1079 | if (ParallelGCThreads > 0) { |
ysr@777 | 1080 | double ret = 0.0; |
ysr@777 | 1081 | for (uint i = 0; i < ParallelGCThreads; ++i) |
ysr@777 | 1082 | ret += data[i]; |
ysr@777 | 1083 | return ret / (double) ParallelGCThreads; |
ysr@777 | 1084 | } else { |
ysr@777 | 1085 | return data[0]; |
ysr@777 | 1086 | } |
ysr@777 | 1087 | } |
ysr@777 | 1088 | |
ysr@777 | 1089 | double G1CollectorPolicy::max_value (double* data) { |
ysr@777 | 1090 | if (ParallelGCThreads > 0) { |
ysr@777 | 1091 | double ret = data[0]; |
ysr@777 | 1092 | for (uint i = 1; i < ParallelGCThreads; ++i) |
ysr@777 | 1093 | if (data[i] > ret) |
ysr@777 | 1094 | ret = data[i]; |
ysr@777 | 1095 | return ret; |
ysr@777 | 1096 | } else { |
ysr@777 | 1097 | return data[0]; |
ysr@777 | 1098 | } |
ysr@777 | 1099 | } |
ysr@777 | 1100 | |
ysr@777 | 1101 | double G1CollectorPolicy::sum_of_values (double* data) { |
ysr@777 | 1102 | if (ParallelGCThreads > 0) { |
ysr@777 | 1103 | double sum = 0.0; |
ysr@777 | 1104 | for (uint i = 0; i < ParallelGCThreads; i++) |
ysr@777 | 1105 | sum += data[i]; |
ysr@777 | 1106 | return sum; |
ysr@777 | 1107 | } else { |
ysr@777 | 1108 | return data[0]; |
ysr@777 | 1109 | } |
ysr@777 | 1110 | } |
ysr@777 | 1111 | |
ysr@777 | 1112 | double G1CollectorPolicy::max_sum (double* data1, |
ysr@777 | 1113 | double* data2) { |
ysr@777 | 1114 | double ret = data1[0] + data2[0]; |
ysr@777 | 1115 | |
ysr@777 | 1116 | if (ParallelGCThreads > 0) { |
ysr@777 | 1117 | for (uint i = 1; i < ParallelGCThreads; ++i) { |
ysr@777 | 1118 | double data = data1[i] + data2[i]; |
ysr@777 | 1119 | if (data > ret) |
ysr@777 | 1120 | ret = data; |
ysr@777 | 1121 | } |
ysr@777 | 1122 | } |
ysr@777 | 1123 | return ret; |
ysr@777 | 1124 | } |
ysr@777 | 1125 | |
ysr@777 | 1126 | // Anything below that is considered to be zero |
ysr@777 | 1127 | #define MIN_TIMER_GRANULARITY 0.0000001 |
ysr@777 | 1128 | |
apetrusenko@1112 | 1129 | void G1CollectorPolicy::record_collection_pause_end(bool abandoned) { |
ysr@777 | 1130 | double end_time_sec = os::elapsedTime(); |
ysr@777 | 1131 | double elapsed_ms = _last_pause_time_ms; |
ysr@777 | 1132 | bool parallel = ParallelGCThreads > 0; |
ysr@777 | 1133 | double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
ysr@777 | 1134 | size_t rs_size = |
ysr@777 | 1135 | _cur_collection_pause_used_regions_at_start - collection_set_size(); |
ysr@777 | 1136 | size_t cur_used_bytes = _g1->used(); |
ysr@777 | 1137 | assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); |
ysr@777 | 1138 | bool last_pause_included_initial_mark = false; |
tonyp@1030 | 1139 | bool update_stats = !abandoned && !_g1->evacuation_failed(); |
ysr@777 | 1140 | |
ysr@777 | 1141 | #ifndef PRODUCT |
ysr@777 | 1142 | if (G1YoungSurvRateVerbose) { |
ysr@777 | 1143 | gclog_or_tty->print_cr(""); |
ysr@777 | 1144 | _short_lived_surv_rate_group->print(); |
ysr@777 | 1145 | // do that for any other surv rate groups too |
ysr@777 | 1146 | } |
ysr@777 | 1147 | #endif // PRODUCT |
ysr@777 | 1148 | |
ysr@777 | 1149 | if (in_young_gc_mode()) { |
tonyp@1794 | 1150 | last_pause_included_initial_mark = during_initial_mark_pause(); |
ysr@777 | 1151 | if (last_pause_included_initial_mark) |
ysr@777 | 1152 | record_concurrent_mark_init_end_pre(0.0); |
ysr@777 | 1153 | |
ysr@777 | 1154 | size_t min_used_targ = |
tonyp@1718 | 1155 | (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
ysr@777 | 1156 | |
tonyp@1794 | 1157 | |
tonyp@1794 | 1158 | if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
tonyp@1794 | 1159 | assert(!last_pause_included_initial_mark, "invariant"); |
tonyp@1794 | 1160 | if (cur_used_bytes > min_used_targ && |
tonyp@1794 | 1161 | cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
tonyp@1794 | 1162 | assert(!during_initial_mark_pause(), "we should not see this here"); |
tonyp@1794 | 1163 | |
tonyp@1794 | 1164 | // Note: this might have already been set, if during the last |
tonyp@1794 | 1165 | // pause we decided to start a cycle but at the beginning of |
tonyp@1794 | 1166 | // this pause we decided to postpone it. That's OK. |
tonyp@1794 | 1167 | set_initiate_conc_mark_if_possible(); |
ysr@777 | 1168 | } |
ysr@777 | 1169 | } |
ysr@777 | 1170 | |
ysr@777 | 1171 | _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
ysr@777 | 1172 | } |
ysr@777 | 1173 | |
ysr@777 | 1174 | _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
ysr@777 | 1175 | end_time_sec, false); |
ysr@777 | 1176 | |
ysr@777 | 1177 | guarantee(_cur_collection_pause_used_regions_at_start >= |
ysr@777 | 1178 | collection_set_size(), |
ysr@777 | 1179 | "Negative RS size?"); |
ysr@777 | 1180 | |
ysr@777 | 1181 | // This assert is exempted when we're doing parallel collection pauses, |
ysr@777 | 1182 | // because the fragmentation caused by the parallel GC allocation buffers |
ysr@777 | 1183 | // can lead to more memory being used during collection than was used |
ysr@777 | 1184 | // before. Best leave this out until the fragmentation problem is fixed. |
ysr@777 | 1185 | // Pauses in which evacuation failed can also lead to negative |
ysr@777 | 1186 | // collections, since no space is reclaimed from a region containing an |
ysr@777 | 1187 | // object whose evacuation failed. |
ysr@777 | 1188 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 1189 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 1190 | // (DLD, 10/05.) |
ysr@777 | 1191 | assert((true || parallel) // Always using GC LABs now. |
ysr@777 | 1192 | || _g1->evacuation_failed() |
ysr@777 | 1193 | || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, |
ysr@777 | 1194 | "Negative collection"); |
ysr@777 | 1195 | |
ysr@777 | 1196 | size_t freed_bytes = |
ysr@777 | 1197 | _cur_collection_pause_used_at_start_bytes - cur_used_bytes; |
ysr@777 | 1198 | size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; |
johnc@1829 | 1199 | |
ysr@777 | 1200 | double survival_fraction = |
ysr@777 | 1201 | (double)surviving_bytes/ |
ysr@777 | 1202 | (double)_collection_set_bytes_used_before; |
ysr@777 | 1203 | |
ysr@777 | 1204 | _n_pauses++; |
ysr@777 | 1205 | |
tonyp@1030 | 1206 | if (update_stats) { |
ysr@777 | 1207 | _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
ysr@777 | 1208 | _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); |
ysr@777 | 1209 | _recent_evac_times_ms->add(evac_ms); |
ysr@777 | 1210 | _recent_pause_times_ms->add(elapsed_ms); |
ysr@777 | 1211 | |
ysr@777 | 1212 | _recent_rs_sizes->add(rs_size); |
ysr@777 | 1213 | |
ysr@777 | 1214 | // We exempt parallel collection from this check because Alloc Buffer |
ysr@777 | 1215 | // fragmentation can produce negative collections. Same with evac |
ysr@777 | 1216 | // failure. |
ysr@777 | 1217 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 1218 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 1219 | // (DLD, 10/05. |
ysr@777 | 1220 | assert((true || parallel) |
ysr@777 | 1221 | || _g1->evacuation_failed() |
ysr@777 | 1222 | || surviving_bytes <= _collection_set_bytes_used_before, |
ysr@777 | 1223 | "Or else negative collection!"); |
ysr@777 | 1224 | _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); |
ysr@777 | 1225 | _recent_CS_bytes_surviving->add(surviving_bytes); |
ysr@777 | 1226 | |
ysr@777 | 1227 | // this is where we update the allocation rate of the application |
ysr@777 | 1228 | double app_time_ms = |
ysr@777 | 1229 | (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); |
ysr@777 | 1230 | if (app_time_ms < MIN_TIMER_GRANULARITY) { |
ysr@777 | 1231 | // This usually happens due to the timer not having the required |
ysr@777 | 1232 | // granularity. Some Linuxes are the usual culprits. |
ysr@777 | 1233 | // We'll just set it to something (arbitrarily) small. |
ysr@777 | 1234 | app_time_ms = 1.0; |
ysr@777 | 1235 | } |
ysr@777 | 1236 | size_t regions_allocated = |
ysr@777 | 1237 | (_region_num_young - _prev_region_num_young) + |
ysr@777 | 1238 | (_region_num_tenured - _prev_region_num_tenured); |
ysr@777 | 1239 | double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
ysr@777 | 1240 | _alloc_rate_ms_seq->add(alloc_rate_ms); |
ysr@777 | 1241 | _prev_region_num_young = _region_num_young; |
ysr@777 | 1242 | _prev_region_num_tenured = _region_num_tenured; |
ysr@777 | 1243 | |
ysr@777 | 1244 | double interval_ms = |
ysr@777 | 1245 | (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; |
ysr@777 | 1246 | update_recent_gc_times(end_time_sec, elapsed_ms); |
ysr@777 | 1247 | _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; |
ysr@1521 | 1248 | if (recent_avg_pause_time_ratio() < 0.0 || |
ysr@1521 | 1249 | (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
ysr@1521 | 1250 | #ifndef PRODUCT |
ysr@1521 | 1251 | // Dump info to allow post-facto debugging |
ysr@1521 | 1252 | gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
ysr@1521 | 1253 | gclog_or_tty->print_cr("-------------------------------------------"); |
ysr@1521 | 1254 | gclog_or_tty->print_cr("Recent GC Times (ms):"); |
ysr@1521 | 1255 | _recent_gc_times_ms->dump(); |
ysr@1521 | 1256 | gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
ysr@1521 | 1257 | _recent_prev_end_times_for_all_gcs_sec->dump(); |
ysr@1521 | 1258 | gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
ysr@1521 | 1259 | _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
ysr@1522 | 1260 | // In debug mode, terminate the JVM if the user wants to debug at this point. |
ysr@1522 | 1261 | assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
ysr@1522 | 1262 | #endif // !PRODUCT |
ysr@1522 | 1263 | // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
ysr@1522 | 1264 | // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
ysr@1521 | 1265 | if (_recent_avg_pause_time_ratio < 0.0) { |
ysr@1521 | 1266 | _recent_avg_pause_time_ratio = 0.0; |
ysr@1521 | 1267 | } else { |
ysr@1521 | 1268 | assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
ysr@1521 | 1269 | _recent_avg_pause_time_ratio = 1.0; |
ysr@1521 | 1270 | } |
ysr@1521 | 1271 | } |
ysr@777 | 1272 | } |
ysr@777 | 1273 | |
ysr@777 | 1274 | if (G1PolicyVerbose > 1) { |
ysr@777 | 1275 | gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); |
ysr@777 | 1276 | } |
ysr@777 | 1277 | |
ysr@777 | 1278 | PauseSummary* summary; |
apetrusenko@1112 | 1279 | if (abandoned) { |
apetrusenko@1112 | 1280 | summary = _abandoned_summary; |
apetrusenko@1112 | 1281 | } else { |
apetrusenko@1112 | 1282 | summary = _summary; |
ysr@777 | 1283 | } |
ysr@777 | 1284 | |
ysr@777 | 1285 | double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
ysr@777 | 1286 | double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
ysr@777 | 1287 | double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
ysr@777 | 1288 | double update_rs_processed_buffers = |
ysr@777 | 1289 | sum_of_values(_par_last_update_rs_processed_buffers); |
ysr@777 | 1290 | double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
ysr@777 | 1291 | double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
ysr@777 | 1292 | double termination_time = avg_value(_par_last_termination_times_ms); |
ysr@777 | 1293 | |
tonyp@1083 | 1294 | double parallel_other_time = _cur_collection_par_time_ms - |
tonyp@1083 | 1295 | (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
johnc@1829 | 1296 | scan_rs_time + obj_copy_time + termination_time); |
tonyp@1030 | 1297 | if (update_stats) { |
ysr@777 | 1298 | MainBodySummary* body_summary = summary->main_body_summary(); |
ysr@777 | 1299 | guarantee(body_summary != NULL, "should not be null!"); |
ysr@777 | 1300 | |
ysr@777 | 1301 | if (_satb_drain_time_set) |
ysr@777 | 1302 | body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
ysr@777 | 1303 | else |
ysr@777 | 1304 | body_summary->record_satb_drain_time_ms(0.0); |
ysr@777 | 1305 | body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
ysr@777 | 1306 | body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
ysr@777 | 1307 | body_summary->record_update_rs_time_ms(update_rs_time); |
ysr@777 | 1308 | body_summary->record_scan_rs_time_ms(scan_rs_time); |
ysr@777 | 1309 | body_summary->record_obj_copy_time_ms(obj_copy_time); |
ysr@777 | 1310 | if (parallel) { |
ysr@777 | 1311 | body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
ysr@777 | 1312 | body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
ysr@777 | 1313 | body_summary->record_termination_time_ms(termination_time); |
ysr@777 | 1314 | body_summary->record_parallel_other_time_ms(parallel_other_time); |
ysr@777 | 1315 | } |
ysr@777 | 1316 | body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
ysr@777 | 1317 | } |
ysr@777 | 1318 | |
ysr@777 | 1319 | if (G1PolicyVerbose > 1) { |
ysr@777 | 1320 | gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1321 | " CH Strong: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1322 | " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1323 | " Evac: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1324 | " ET-RS: %10.6f ms (avg: %10.6f ms)\n" |
ysr@777 | 1325 | " |RS|: " SIZE_FORMAT, |
ysr@777 | 1326 | elapsed_ms, recent_avg_time_for_pauses_ms(), |
ysr@777 | 1327 | _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), |
ysr@777 | 1328 | _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), |
ysr@777 | 1329 | evac_ms, recent_avg_time_for_evac_ms(), |
ysr@777 | 1330 | scan_rs_time, |
ysr@777 | 1331 | recent_avg_time_for_pauses_ms() - |
ysr@777 | 1332 | recent_avg_time_for_G1_strong_ms(), |
ysr@777 | 1333 | rs_size); |
ysr@777 | 1334 | |
ysr@777 | 1335 | gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" |
ysr@777 | 1336 | " At end " SIZE_FORMAT "K\n" |
ysr@777 | 1337 | " garbage : " SIZE_FORMAT "K" |
ysr@777 | 1338 | " of " SIZE_FORMAT "K\n" |
ysr@777 | 1339 | " survival : %6.2f%% (%6.2f%% avg)", |
ysr@777 | 1340 | _cur_collection_pause_used_at_start_bytes/K, |
ysr@777 | 1341 | _g1->used()/K, freed_bytes/K, |
ysr@777 | 1342 | _collection_set_bytes_used_before/K, |
ysr@777 | 1343 | survival_fraction*100.0, |
ysr@777 | 1344 | recent_avg_survival_fraction()*100.0); |
ysr@777 | 1345 | gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", |
ysr@777 | 1346 | recent_avg_pause_time_ratio() * 100.0); |
ysr@777 | 1347 | } |
ysr@777 | 1348 | |
ysr@777 | 1349 | double other_time_ms = elapsed_ms; |
ysr@777 | 1350 | |
ysr@777 | 1351 | if (!abandoned) { |
ysr@777 | 1352 | if (_satb_drain_time_set) |
ysr@777 | 1353 | other_time_ms -= _cur_satb_drain_time_ms; |
ysr@777 | 1354 | |
ysr@777 | 1355 | if (parallel) |
ysr@777 | 1356 | other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; |
ysr@777 | 1357 | else |
ysr@777 | 1358 | other_time_ms -= |
ysr@777 | 1359 | update_rs_time + |
johnc@1829 | 1360 | ext_root_scan_time + mark_stack_scan_time + |
ysr@777 | 1361 | scan_rs_time + obj_copy_time; |
ysr@777 | 1362 | } |
ysr@777 | 1363 | |
ysr@777 | 1364 | if (PrintGCDetails) { |
ysr@777 | 1365 | gclog_or_tty->print_cr("%s%s, %1.8lf secs]", |
apetrusenko@1112 | 1366 | abandoned ? " (abandoned)" : "", |
ysr@777 | 1367 | (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
ysr@777 | 1368 | elapsed_ms / 1000.0); |
ysr@777 | 1369 | |
ysr@777 | 1370 | if (!abandoned) { |
apetrusenko@1112 | 1371 | if (_satb_drain_time_set) { |
ysr@777 | 1372 | print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); |
apetrusenko@1112 | 1373 | } |
apetrusenko@1112 | 1374 | if (_last_satb_drain_processed_buffers >= 0) { |
ysr@777 | 1375 | print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); |
apetrusenko@1112 | 1376 | } |
apetrusenko@1112 | 1377 | if (parallel) { |
apetrusenko@1112 | 1378 | print_stats(1, "Parallel Time", _cur_collection_par_time_ms); |
tonyp@1966 | 1379 | print_par_stats(2, "GC Worker Start Time", |
tonyp@1966 | 1380 | _par_last_gc_worker_start_times_ms, false); |
apetrusenko@1112 | 1381 | print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
tonyp@1966 | 1382 | print_par_sizes(3, "Processed Buffers", |
tonyp@1966 | 1383 | _par_last_update_rs_processed_buffers, true); |
tonyp@1966 | 1384 | print_par_stats(2, "Ext Root Scanning", |
tonyp@1966 | 1385 | _par_last_ext_root_scan_times_ms); |
tonyp@1966 | 1386 | print_par_stats(2, "Mark Stack Scanning", |
tonyp@1966 | 1387 | _par_last_mark_stack_scan_times_ms); |
ysr@777 | 1388 | print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
ysr@777 | 1389 | print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); |
ysr@777 | 1390 | print_par_stats(2, "Termination", _par_last_termination_times_ms); |
tonyp@1966 | 1391 | print_par_sizes(3, "Termination Attempts", |
tonyp@1966 | 1392 | _par_last_termination_attempts, true); |
tonyp@1966 | 1393 | print_par_stats(2, "GC Worker End Time", |
tonyp@1966 | 1394 | _par_last_gc_worker_end_times_ms, false); |
ysr@777 | 1395 | print_stats(2, "Other", parallel_other_time); |
ysr@777 | 1396 | print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
apetrusenko@1112 | 1397 | } else { |
apetrusenko@1112 | 1398 | print_stats(1, "Update RS", update_rs_time); |
iveresov@1229 | 1399 | print_stats(2, "Processed Buffers", |
iveresov@1229 | 1400 | (int)update_rs_processed_buffers); |
ysr@777 | 1401 | print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
ysr@777 | 1402 | print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); |
ysr@777 | 1403 | print_stats(1, "Scan RS", scan_rs_time); |
ysr@777 | 1404 | print_stats(1, "Object Copying", obj_copy_time); |
ysr@777 | 1405 | } |
ysr@777 | 1406 | } |
johnc@1325 | 1407 | #ifndef PRODUCT |
johnc@1325 | 1408 | print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
johnc@1325 | 1409 | print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
johnc@1325 | 1410 | print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
johnc@1325 | 1411 | print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
johnc@1325 | 1412 | if (_num_cc_clears > 0) { |
johnc@1325 | 1413 | print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
johnc@1325 | 1414 | } |
johnc@1325 | 1415 | #endif |
ysr@777 | 1416 | print_stats(1, "Other", other_time_ms); |
johnc@1829 | 1417 | print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
johnc@1829 | 1418 | |
ysr@777 | 1419 | for (int i = 0; i < _aux_num; ++i) { |
ysr@777 | 1420 | if (_cur_aux_times_set[i]) { |
ysr@777 | 1421 | char buffer[96]; |
ysr@777 | 1422 | sprintf(buffer, "Aux%d", i); |
ysr@777 | 1423 | print_stats(1, buffer, _cur_aux_times_ms[i]); |
ysr@777 | 1424 | } |
ysr@777 | 1425 | } |
ysr@777 | 1426 | } |
ysr@777 | 1427 | if (PrintGCDetails) |
ysr@777 | 1428 | gclog_or_tty->print(" ["); |
ysr@777 | 1429 | if (PrintGC || PrintGCDetails) |
ysr@777 | 1430 | _g1->print_size_transition(gclog_or_tty, |
ysr@777 | 1431 | _cur_collection_pause_used_at_start_bytes, |
ysr@777 | 1432 | _g1->used(), _g1->capacity()); |
ysr@777 | 1433 | if (PrintGCDetails) |
ysr@777 | 1434 | gclog_or_tty->print_cr("]"); |
ysr@777 | 1435 | |
ysr@777 | 1436 | _all_pause_times_ms->add(elapsed_ms); |
tonyp@1083 | 1437 | if (update_stats) { |
tonyp@1083 | 1438 | summary->record_total_time_ms(elapsed_ms); |
tonyp@1083 | 1439 | summary->record_other_time_ms(other_time_ms); |
tonyp@1083 | 1440 | } |
ysr@777 | 1441 | for (int i = 0; i < _aux_num; ++i) |
ysr@777 | 1442 | if (_cur_aux_times_set[i]) |
ysr@777 | 1443 | _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); |
ysr@777 | 1444 | |
ysr@777 | 1445 | // Reset marks-between-pauses counter. |
ysr@777 | 1446 | _n_marks_since_last_pause = 0; |
ysr@777 | 1447 | |
ysr@777 | 1448 | // Update the efficiency-since-mark vars. |
ysr@777 | 1449 | double proc_ms = elapsed_ms * (double) _parallel_gc_threads; |
ysr@777 | 1450 | if (elapsed_ms < MIN_TIMER_GRANULARITY) { |
ysr@777 | 1451 | // This usually happens due to the timer not having the required |
ysr@777 | 1452 | // granularity. Some Linuxes are the usual culprits. |
ysr@777 | 1453 | // We'll just set it to something (arbitrarily) small. |
ysr@777 | 1454 | proc_ms = 1.0; |
ysr@777 | 1455 | } |
ysr@777 | 1456 | double cur_efficiency = (double) freed_bytes / proc_ms; |
ysr@777 | 1457 | |
ysr@777 | 1458 | bool new_in_marking_window = _in_marking_window; |
ysr@777 | 1459 | bool new_in_marking_window_im = false; |
tonyp@1794 | 1460 | if (during_initial_mark_pause()) { |
ysr@777 | 1461 | new_in_marking_window = true; |
ysr@777 | 1462 | new_in_marking_window_im = true; |
ysr@777 | 1463 | } |
ysr@777 | 1464 | |
ysr@777 | 1465 | if (in_young_gc_mode()) { |
ysr@777 | 1466 | if (_last_full_young_gc) { |
ysr@777 | 1467 | set_full_young_gcs(false); |
ysr@777 | 1468 | _last_full_young_gc = false; |
ysr@777 | 1469 | } |
ysr@777 | 1470 | |
ysr@777 | 1471 | if ( !_last_young_gc_full ) { |
ysr@777 | 1472 | if ( _should_revert_to_full_young_gcs || |
ysr@777 | 1473 | _known_garbage_ratio < 0.05 || |
ysr@777 | 1474 | (adaptive_young_list_length() && |
ysr@777 | 1475 | (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { |
ysr@777 | 1476 | set_full_young_gcs(true); |
ysr@777 | 1477 | } |
ysr@777 | 1478 | } |
ysr@777 | 1479 | _should_revert_to_full_young_gcs = false; |
ysr@777 | 1480 | |
ysr@777 | 1481 | if (_last_young_gc_full && !_during_marking) |
ysr@777 | 1482 | _young_gc_eff_seq->add(cur_efficiency); |
ysr@777 | 1483 | } |
ysr@777 | 1484 | |
ysr@777 | 1485 | _short_lived_surv_rate_group->start_adding_regions(); |
ysr@777 | 1486 | // do that for any other surv rate groupsx |
ysr@777 | 1487 | |
ysr@777 | 1488 | // <NEW PREDICTION> |
ysr@777 | 1489 | |
apetrusenko@1112 | 1490 | if (update_stats) { |
ysr@777 | 1491 | double pause_time_ms = elapsed_ms; |
ysr@777 | 1492 | |
ysr@777 | 1493 | size_t diff = 0; |
ysr@777 | 1494 | if (_max_pending_cards >= _pending_cards) |
ysr@777 | 1495 | diff = _max_pending_cards - _pending_cards; |
ysr@777 | 1496 | _pending_card_diff_seq->add((double) diff); |
ysr@777 | 1497 | |
ysr@777 | 1498 | double cost_per_card_ms = 0.0; |
ysr@777 | 1499 | if (_pending_cards > 0) { |
ysr@777 | 1500 | cost_per_card_ms = update_rs_time / (double) _pending_cards; |
ysr@777 | 1501 | _cost_per_card_ms_seq->add(cost_per_card_ms); |
ysr@777 | 1502 | } |
ysr@777 | 1503 | |
ysr@777 | 1504 | size_t cards_scanned = _g1->cards_scanned(); |
ysr@777 | 1505 | |
ysr@777 | 1506 | double cost_per_entry_ms = 0.0; |
ysr@777 | 1507 | if (cards_scanned > 10) { |
ysr@777 | 1508 | cost_per_entry_ms = scan_rs_time / (double) cards_scanned; |
ysr@777 | 1509 | if (_last_young_gc_full) |
ysr@777 | 1510 | _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
ysr@777 | 1511 | else |
ysr@777 | 1512 | _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); |
ysr@777 | 1513 | } |
ysr@777 | 1514 | |
ysr@777 | 1515 | if (_max_rs_lengths > 0) { |
ysr@777 | 1516 | double cards_per_entry_ratio = |
ysr@777 | 1517 | (double) cards_scanned / (double) _max_rs_lengths; |
ysr@777 | 1518 | if (_last_young_gc_full) |
ysr@777 | 1519 | _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); |
ysr@777 | 1520 | else |
ysr@777 | 1521 | _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); |
ysr@777 | 1522 | } |
ysr@777 | 1523 | |
ysr@777 | 1524 | size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
ysr@777 | 1525 | if (rs_length_diff >= 0) |
ysr@777 | 1526 | _rs_length_diff_seq->add((double) rs_length_diff); |
ysr@777 | 1527 | |
ysr@777 | 1528 | size_t copied_bytes = surviving_bytes; |
ysr@777 | 1529 | double cost_per_byte_ms = 0.0; |
ysr@777 | 1530 | if (copied_bytes > 0) { |
ysr@777 | 1531 | cost_per_byte_ms = obj_copy_time / (double) copied_bytes; |
ysr@777 | 1532 | if (_in_marking_window) |
ysr@777 | 1533 | _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
ysr@777 | 1534 | else |
ysr@777 | 1535 | _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
ysr@777 | 1536 | } |
ysr@777 | 1537 | |
ysr@777 | 1538 | double all_other_time_ms = pause_time_ms - |
johnc@1829 | 1539 | (update_rs_time + scan_rs_time + obj_copy_time + |
ysr@777 | 1540 | _mark_closure_time_ms + termination_time); |
ysr@777 | 1541 | |
ysr@777 | 1542 | double young_other_time_ms = 0.0; |
ysr@777 | 1543 | if (_recorded_young_regions > 0) { |
ysr@777 | 1544 | young_other_time_ms = |
ysr@777 | 1545 | _recorded_young_cset_choice_time_ms + |
ysr@777 | 1546 | _recorded_young_free_cset_time_ms; |
ysr@777 | 1547 | _young_other_cost_per_region_ms_seq->add(young_other_time_ms / |
ysr@777 | 1548 | (double) _recorded_young_regions); |
ysr@777 | 1549 | } |
ysr@777 | 1550 | double non_young_other_time_ms = 0.0; |
ysr@777 | 1551 | if (_recorded_non_young_regions > 0) { |
ysr@777 | 1552 | non_young_other_time_ms = |
ysr@777 | 1553 | _recorded_non_young_cset_choice_time_ms + |
ysr@777 | 1554 | _recorded_non_young_free_cset_time_ms; |
ysr@777 | 1555 | |
ysr@777 | 1556 | _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / |
ysr@777 | 1557 | (double) _recorded_non_young_regions); |
ysr@777 | 1558 | } |
ysr@777 | 1559 | |
ysr@777 | 1560 | double constant_other_time_ms = all_other_time_ms - |
ysr@777 | 1561 | (young_other_time_ms + non_young_other_time_ms); |
ysr@777 | 1562 | _constant_other_time_ms_seq->add(constant_other_time_ms); |
ysr@777 | 1563 | |
ysr@777 | 1564 | double survival_ratio = 0.0; |
ysr@777 | 1565 | if (_bytes_in_collection_set_before_gc > 0) { |
ysr@777 | 1566 | survival_ratio = (double) bytes_in_to_space_during_gc() / |
ysr@777 | 1567 | (double) _bytes_in_collection_set_before_gc; |
ysr@777 | 1568 | } |
ysr@777 | 1569 | |
ysr@777 | 1570 | _pending_cards_seq->add((double) _pending_cards); |
ysr@777 | 1571 | _scanned_cards_seq->add((double) cards_scanned); |
ysr@777 | 1572 | _rs_lengths_seq->add((double) _max_rs_lengths); |
ysr@777 | 1573 | |
ysr@777 | 1574 | double expensive_region_limit_ms = |
johnc@1186 | 1575 | (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
ysr@777 | 1576 | if (expensive_region_limit_ms < 0.0) { |
ysr@777 | 1577 | // this means that the other time was predicted to be longer than |
ysr@777 | 1578 | // than the max pause time |
johnc@1186 | 1579 | expensive_region_limit_ms = (double) MaxGCPauseMillis; |
ysr@777 | 1580 | } |
ysr@777 | 1581 | _expensive_region_limit_ms = expensive_region_limit_ms; |
ysr@777 | 1582 | |
ysr@777 | 1583 | if (PREDICTIONS_VERBOSE) { |
ysr@777 | 1584 | gclog_or_tty->print_cr(""); |
ysr@777 | 1585 | gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " |
johnc@1829 | 1586 | "REGIONS %d %d %d " |
ysr@777 | 1587 | "PENDING_CARDS %d %d " |
ysr@777 | 1588 | "CARDS_SCANNED %d %d " |
ysr@777 | 1589 | "RS_LENGTHS %d %d " |
ysr@777 | 1590 | "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " |
ysr@777 | 1591 | "SURVIVAL_RATIO %1.6lf %1.6lf " |
ysr@777 | 1592 | "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " |
ysr@777 | 1593 | "OTHER_YOUNG %1.6lf %1.6lf " |
ysr@777 | 1594 | "OTHER_NON_YOUNG %1.6lf %1.6lf " |
ysr@777 | 1595 | "VTIME_DIFF %1.6lf TERMINATION %1.6lf " |
ysr@777 | 1596 | "ELAPSED %1.6lf %1.6lf ", |
ysr@777 | 1597 | _cur_collection_start_sec, |
ysr@777 | 1598 | (!_last_young_gc_full) ? 2 : |
ysr@777 | 1599 | (last_pause_included_initial_mark) ? 1 : 0, |
ysr@777 | 1600 | _recorded_region_num, |
ysr@777 | 1601 | _recorded_young_regions, |
ysr@777 | 1602 | _recorded_non_young_regions, |
ysr@777 | 1603 | _predicted_pending_cards, _pending_cards, |
ysr@777 | 1604 | _predicted_cards_scanned, cards_scanned, |
ysr@777 | 1605 | _predicted_rs_lengths, _max_rs_lengths, |
ysr@777 | 1606 | _predicted_rs_update_time_ms, update_rs_time, |
ysr@777 | 1607 | _predicted_rs_scan_time_ms, scan_rs_time, |
ysr@777 | 1608 | _predicted_survival_ratio, survival_ratio, |
ysr@777 | 1609 | _predicted_object_copy_time_ms, obj_copy_time, |
ysr@777 | 1610 | _predicted_constant_other_time_ms, constant_other_time_ms, |
ysr@777 | 1611 | _predicted_young_other_time_ms, young_other_time_ms, |
ysr@777 | 1612 | _predicted_non_young_other_time_ms, |
ysr@777 | 1613 | non_young_other_time_ms, |
ysr@777 | 1614 | _vtime_diff_ms, termination_time, |
ysr@777 | 1615 | _predicted_pause_time_ms, elapsed_ms); |
ysr@777 | 1616 | } |
ysr@777 | 1617 | |
ysr@777 | 1618 | if (G1PolicyVerbose > 0) { |
ysr@777 | 1619 | gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", |
ysr@777 | 1620 | _predicted_pause_time_ms, |
ysr@777 | 1621 | (_within_target) ? "within" : "outside", |
ysr@777 | 1622 | elapsed_ms); |
ysr@777 | 1623 | } |
ysr@777 | 1624 | |
ysr@777 | 1625 | } |
ysr@777 | 1626 | |
ysr@777 | 1627 | _in_marking_window = new_in_marking_window; |
ysr@777 | 1628 | _in_marking_window_im = new_in_marking_window_im; |
ysr@777 | 1629 | _free_regions_at_end_of_collection = _g1->free_regions(); |
ysr@777 | 1630 | calculate_young_list_min_length(); |
johnc@1829 | 1631 | calculate_young_list_target_length(); |
ysr@777 | 1632 | |
iveresov@1546 | 1633 | // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
tonyp@1717 | 1634 | double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
iveresov@1546 | 1635 | adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
ysr@777 | 1636 | // </NEW PREDICTION> |
ysr@777 | 1637 | } |
ysr@777 | 1638 | |
ysr@777 | 1639 | // <NEW PREDICTION> |
ysr@777 | 1640 | |
iveresov@1546 | 1641 | void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
iveresov@1546 | 1642 | double update_rs_processed_buffers, |
iveresov@1546 | 1643 | double goal_ms) { |
iveresov@1546 | 1644 | DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); |
iveresov@1546 | 1645 | ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); |
iveresov@1546 | 1646 | |
tonyp@1717 | 1647 | if (G1UseAdaptiveConcRefinement) { |
iveresov@1546 | 1648 | const int k_gy = 3, k_gr = 6; |
iveresov@1546 | 1649 | const double inc_k = 1.1, dec_k = 0.9; |
iveresov@1546 | 1650 | |
iveresov@1546 | 1651 | int g = cg1r->green_zone(); |
iveresov@1546 | 1652 | if (update_rs_time > goal_ms) { |
iveresov@1546 | 1653 | g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. |
iveresov@1546 | 1654 | } else { |
iveresov@1546 | 1655 | if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { |
iveresov@1546 | 1656 | g = (int)MAX2(g * inc_k, g + 1.0); |
iveresov@1546 | 1657 | } |
iveresov@1546 | 1658 | } |
iveresov@1546 | 1659 | // Change the refinement threads params |
iveresov@1546 | 1660 | cg1r->set_green_zone(g); |
iveresov@1546 | 1661 | cg1r->set_yellow_zone(g * k_gy); |
iveresov@1546 | 1662 | cg1r->set_red_zone(g * k_gr); |
iveresov@1546 | 1663 | cg1r->reinitialize_threads(); |
iveresov@1546 | 1664 | |
iveresov@1546 | 1665 | int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); |
iveresov@1546 | 1666 | int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, |
iveresov@1546 | 1667 | cg1r->yellow_zone()); |
iveresov@1546 | 1668 | // Change the barrier params |
iveresov@1546 | 1669 | dcqs.set_process_completed_threshold(processing_threshold); |
iveresov@1546 | 1670 | dcqs.set_max_completed_queue(cg1r->red_zone()); |
iveresov@1546 | 1671 | } |
iveresov@1546 | 1672 | |
iveresov@1546 | 1673 | int curr_queue_size = dcqs.completed_buffers_num(); |
iveresov@1546 | 1674 | if (curr_queue_size >= cg1r->yellow_zone()) { |
iveresov@1546 | 1675 | dcqs.set_completed_queue_padding(curr_queue_size); |
iveresov@1546 | 1676 | } else { |
iveresov@1546 | 1677 | dcqs.set_completed_queue_padding(0); |
iveresov@1546 | 1678 | } |
iveresov@1546 | 1679 | dcqs.notify_if_necessary(); |
iveresov@1546 | 1680 | } |
iveresov@1546 | 1681 | |
ysr@777 | 1682 | double |
ysr@777 | 1683 | G1CollectorPolicy:: |
ysr@777 | 1684 | predict_young_collection_elapsed_time_ms(size_t adjustment) { |
ysr@777 | 1685 | guarantee( adjustment == 0 || adjustment == 1, "invariant" ); |
ysr@777 | 1686 | |
ysr@777 | 1687 | G1CollectedHeap* g1h = G1CollectedHeap::heap(); |
johnc@1829 | 1688 | size_t young_num = g1h->young_list()->length(); |
ysr@777 | 1689 | if (young_num == 0) |
ysr@777 | 1690 | return 0.0; |
ysr@777 | 1691 | |
ysr@777 | 1692 | young_num += adjustment; |
ysr@777 | 1693 | size_t pending_cards = predict_pending_cards(); |
johnc@1829 | 1694 | size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
ysr@777 | 1695 | predict_rs_length_diff(); |
ysr@777 | 1696 | size_t card_num; |
ysr@777 | 1697 | if (full_young_gcs()) |
ysr@777 | 1698 | card_num = predict_young_card_num(rs_lengths); |
ysr@777 | 1699 | else |
ysr@777 | 1700 | card_num = predict_non_young_card_num(rs_lengths); |
ysr@777 | 1701 | size_t young_byte_size = young_num * HeapRegion::GrainBytes; |
ysr@777 | 1702 | double accum_yg_surv_rate = |
ysr@777 | 1703 | _short_lived_surv_rate_group->accum_surv_rate(adjustment); |
ysr@777 | 1704 | |
ysr@777 | 1705 | size_t bytes_to_copy = |
ysr@777 | 1706 | (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); |
ysr@777 | 1707 | |
ysr@777 | 1708 | return |
ysr@777 | 1709 | predict_rs_update_time_ms(pending_cards) + |
ysr@777 | 1710 | predict_rs_scan_time_ms(card_num) + |
ysr@777 | 1711 | predict_object_copy_time_ms(bytes_to_copy) + |
ysr@777 | 1712 | predict_young_other_time_ms(young_num) + |
ysr@777 | 1713 | predict_constant_other_time_ms(); |
ysr@777 | 1714 | } |
ysr@777 | 1715 | |
ysr@777 | 1716 | double |
ysr@777 | 1717 | G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { |
ysr@777 | 1718 | size_t rs_length = predict_rs_length_diff(); |
ysr@777 | 1719 | size_t card_num; |
ysr@777 | 1720 | if (full_young_gcs()) |
ysr@777 | 1721 | card_num = predict_young_card_num(rs_length); |
ysr@777 | 1722 | else |
ysr@777 | 1723 | card_num = predict_non_young_card_num(rs_length); |
ysr@777 | 1724 | return predict_base_elapsed_time_ms(pending_cards, card_num); |
ysr@777 | 1725 | } |
ysr@777 | 1726 | |
ysr@777 | 1727 | double |
ysr@777 | 1728 | G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, |
ysr@777 | 1729 | size_t scanned_cards) { |
ysr@777 | 1730 | return |
ysr@777 | 1731 | predict_rs_update_time_ms(pending_cards) + |
ysr@777 | 1732 | predict_rs_scan_time_ms(scanned_cards) + |
ysr@777 | 1733 | predict_constant_other_time_ms(); |
ysr@777 | 1734 | } |
ysr@777 | 1735 | |
ysr@777 | 1736 | double |
ysr@777 | 1737 | G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, |
ysr@777 | 1738 | bool young) { |
ysr@777 | 1739 | size_t rs_length = hr->rem_set()->occupied(); |
ysr@777 | 1740 | size_t card_num; |
ysr@777 | 1741 | if (full_young_gcs()) |
ysr@777 | 1742 | card_num = predict_young_card_num(rs_length); |
ysr@777 | 1743 | else |
ysr@777 | 1744 | card_num = predict_non_young_card_num(rs_length); |
ysr@777 | 1745 | size_t bytes_to_copy = predict_bytes_to_copy(hr); |
ysr@777 | 1746 | |
ysr@777 | 1747 | double region_elapsed_time_ms = |
ysr@777 | 1748 | predict_rs_scan_time_ms(card_num) + |
ysr@777 | 1749 | predict_object_copy_time_ms(bytes_to_copy); |
ysr@777 | 1750 | |
ysr@777 | 1751 | if (young) |
ysr@777 | 1752 | region_elapsed_time_ms += predict_young_other_time_ms(1); |
ysr@777 | 1753 | else |
ysr@777 | 1754 | region_elapsed_time_ms += predict_non_young_other_time_ms(1); |
ysr@777 | 1755 | |
ysr@777 | 1756 | return region_elapsed_time_ms; |
ysr@777 | 1757 | } |
ysr@777 | 1758 | |
ysr@777 | 1759 | size_t |
ysr@777 | 1760 | G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { |
ysr@777 | 1761 | size_t bytes_to_copy; |
ysr@777 | 1762 | if (hr->is_marked()) |
ysr@777 | 1763 | bytes_to_copy = hr->max_live_bytes(); |
ysr@777 | 1764 | else { |
ysr@777 | 1765 | guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, |
ysr@777 | 1766 | "invariant" ); |
ysr@777 | 1767 | int age = hr->age_in_surv_rate_group(); |
apetrusenko@980 | 1768 | double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
ysr@777 | 1769 | bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
ysr@777 | 1770 | } |
ysr@777 | 1771 | |
ysr@777 | 1772 | return bytes_to_copy; |
ysr@777 | 1773 | } |
ysr@777 | 1774 | |
ysr@777 | 1775 | void |
ysr@777 | 1776 | G1CollectorPolicy::start_recording_regions() { |
ysr@777 | 1777 | _recorded_rs_lengths = 0; |
ysr@777 | 1778 | _recorded_young_regions = 0; |
ysr@777 | 1779 | _recorded_non_young_regions = 0; |
ysr@777 | 1780 | |
ysr@777 | 1781 | #if PREDICTIONS_VERBOSE |
ysr@777 | 1782 | _recorded_marked_bytes = 0; |
ysr@777 | 1783 | _recorded_young_bytes = 0; |
ysr@777 | 1784 | _predicted_bytes_to_copy = 0; |
johnc@1829 | 1785 | _predicted_rs_lengths = 0; |
johnc@1829 | 1786 | _predicted_cards_scanned = 0; |
ysr@777 | 1787 | #endif // PREDICTIONS_VERBOSE |
ysr@777 | 1788 | } |
ysr@777 | 1789 | |
ysr@777 | 1790 | void |
johnc@1829 | 1791 | G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
ysr@777 | 1792 | #if PREDICTIONS_VERBOSE |
johnc@1829 | 1793 | if (!young) { |
ysr@777 | 1794 | _recorded_marked_bytes += hr->max_live_bytes(); |
ysr@777 | 1795 | } |
ysr@777 | 1796 | _predicted_bytes_to_copy += predict_bytes_to_copy(hr); |
ysr@777 | 1797 | #endif // PREDICTIONS_VERBOSE |
ysr@777 | 1798 | |
ysr@777 | 1799 | size_t rs_length = hr->rem_set()->occupied(); |
ysr@777 | 1800 | _recorded_rs_lengths += rs_length; |
ysr@777 | 1801 | } |
ysr@777 | 1802 | |
ysr@777 | 1803 | void |
johnc@1829 | 1804 | G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
johnc@1829 | 1805 | assert(!hr->is_young(), "should not call this"); |
johnc@1829 | 1806 | ++_recorded_non_young_regions; |
johnc@1829 | 1807 | record_cset_region_info(hr, false); |
johnc@1829 | 1808 | } |
johnc@1829 | 1809 | |
johnc@1829 | 1810 | void |
johnc@1829 | 1811 | G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
johnc@1829 | 1812 | _recorded_young_regions = n_regions; |
johnc@1829 | 1813 | } |
johnc@1829 | 1814 | |
johnc@1829 | 1815 | void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
johnc@1829 | 1816 | #if PREDICTIONS_VERBOSE |
johnc@1829 | 1817 | _recorded_young_bytes = bytes; |
johnc@1829 | 1818 | #endif // PREDICTIONS_VERBOSE |
johnc@1829 | 1819 | } |
johnc@1829 | 1820 | |
johnc@1829 | 1821 | void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
johnc@1829 | 1822 | _recorded_rs_lengths = rs_lengths; |
johnc@1829 | 1823 | } |
johnc@1829 | 1824 | |
johnc@1829 | 1825 | void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
johnc@1829 | 1826 | _predicted_bytes_to_copy = bytes; |
ysr@777 | 1827 | } |
ysr@777 | 1828 | |
ysr@777 | 1829 | void |
ysr@777 | 1830 | G1CollectorPolicy::end_recording_regions() { |
johnc@1829 | 1831 | // The _predicted_pause_time_ms field is referenced in code |
johnc@1829 | 1832 | // not under PREDICTIONS_VERBOSE. Let's initialize it. |
johnc@1829 | 1833 | _predicted_pause_time_ms = -1.0; |
johnc@1829 | 1834 | |
ysr@777 | 1835 | #if PREDICTIONS_VERBOSE |
ysr@777 | 1836 | _predicted_pending_cards = predict_pending_cards(); |
ysr@777 | 1837 | _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); |
ysr@777 | 1838 | if (full_young_gcs()) |
ysr@777 | 1839 | _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); |
ysr@777 | 1840 | else |
ysr@777 | 1841 | _predicted_cards_scanned += |
ysr@777 | 1842 | predict_non_young_card_num(_predicted_rs_lengths); |
ysr@777 | 1843 | _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; |
ysr@777 | 1844 | |
ysr@777 | 1845 | _predicted_rs_update_time_ms = |
ysr@777 | 1846 | predict_rs_update_time_ms(_g1->pending_card_num()); |
ysr@777 | 1847 | _predicted_rs_scan_time_ms = |
ysr@777 | 1848 | predict_rs_scan_time_ms(_predicted_cards_scanned); |
ysr@777 | 1849 | _predicted_object_copy_time_ms = |
ysr@777 | 1850 | predict_object_copy_time_ms(_predicted_bytes_to_copy); |
ysr@777 | 1851 | _predicted_constant_other_time_ms = |
ysr@777 | 1852 | predict_constant_other_time_ms(); |
ysr@777 | 1853 | _predicted_young_other_time_ms = |
ysr@777 | 1854 | predict_young_other_time_ms(_recorded_young_regions); |
ysr@777 | 1855 | _predicted_non_young_other_time_ms = |
ysr@777 | 1856 | predict_non_young_other_time_ms(_recorded_non_young_regions); |
ysr@777 | 1857 | |
ysr@777 | 1858 | _predicted_pause_time_ms = |
ysr@777 | 1859 | _predicted_rs_update_time_ms + |
ysr@777 | 1860 | _predicted_rs_scan_time_ms + |
ysr@777 | 1861 | _predicted_object_copy_time_ms + |
ysr@777 | 1862 | _predicted_constant_other_time_ms + |
ysr@777 | 1863 | _predicted_young_other_time_ms + |
ysr@777 | 1864 | _predicted_non_young_other_time_ms; |
ysr@777 | 1865 | #endif // PREDICTIONS_VERBOSE |
ysr@777 | 1866 | } |
ysr@777 | 1867 | |
ysr@777 | 1868 | void G1CollectorPolicy::check_if_region_is_too_expensive(double |
ysr@777 | 1869 | predicted_time_ms) { |
ysr@777 | 1870 | // I don't think we need to do this when in young GC mode since |
ysr@777 | 1871 | // marking will be initiated next time we hit the soft limit anyway... |
ysr@777 | 1872 | if (predicted_time_ms > _expensive_region_limit_ms) { |
ysr@777 | 1873 | if (!in_young_gc_mode()) { |
ysr@777 | 1874 | set_full_young_gcs(true); |
tonyp@1794 | 1875 | // We might want to do something different here. However, |
tonyp@1794 | 1876 | // right now we don't support the non-generational G1 mode |
tonyp@1794 | 1877 | // (and in fact we are planning to remove the associated code, |
tonyp@1794 | 1878 | // see CR 6814390). So, let's leave it as is and this will be |
tonyp@1794 | 1879 | // removed some time in the future |
tonyp@1794 | 1880 | ShouldNotReachHere(); |
tonyp@1794 | 1881 | set_during_initial_mark_pause(); |
ysr@777 | 1882 | } else |
ysr@777 | 1883 | // no point in doing another partial one |
ysr@777 | 1884 | _should_revert_to_full_young_gcs = true; |
ysr@777 | 1885 | } |
ysr@777 | 1886 | } |
ysr@777 | 1887 | |
ysr@777 | 1888 | // </NEW PREDICTION> |
ysr@777 | 1889 | |
ysr@777 | 1890 | |
ysr@777 | 1891 | void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, |
ysr@777 | 1892 | double elapsed_ms) { |
ysr@777 | 1893 | _recent_gc_times_ms->add(elapsed_ms); |
ysr@777 | 1894 | _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); |
ysr@777 | 1895 | _prev_collection_pause_end_ms = end_time_sec * 1000.0; |
ysr@777 | 1896 | } |
ysr@777 | 1897 | |
ysr@777 | 1898 | double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { |
johnc@1186 | 1899 | if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
ysr@777 | 1900 | else return _recent_pause_times_ms->avg(); |
ysr@777 | 1901 | } |
ysr@777 | 1902 | |
ysr@777 | 1903 | double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { |
ysr@777 | 1904 | if (_recent_CH_strong_roots_times_ms->num() == 0) |
johnc@1186 | 1905 | return (double)MaxGCPauseMillis/3.0; |
ysr@777 | 1906 | else return _recent_CH_strong_roots_times_ms->avg(); |
ysr@777 | 1907 | } |
ysr@777 | 1908 | |
ysr@777 | 1909 | double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { |
ysr@777 | 1910 | if (_recent_G1_strong_roots_times_ms->num() == 0) |
johnc@1186 | 1911 | return (double)MaxGCPauseMillis/3.0; |
ysr@777 | 1912 | else return _recent_G1_strong_roots_times_ms->avg(); |
ysr@777 | 1913 | } |
ysr@777 | 1914 | |
ysr@777 | 1915 | double G1CollectorPolicy::recent_avg_time_for_evac_ms() { |
johnc@1186 | 1916 | if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
ysr@777 | 1917 | else return _recent_evac_times_ms->avg(); |
ysr@777 | 1918 | } |
ysr@777 | 1919 | |
ysr@777 | 1920 | int G1CollectorPolicy::number_of_recent_gcs() { |
ysr@777 | 1921 | assert(_recent_CH_strong_roots_times_ms->num() == |
ysr@777 | 1922 | _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); |
ysr@777 | 1923 | assert(_recent_G1_strong_roots_times_ms->num() == |
ysr@777 | 1924 | _recent_evac_times_ms->num(), "Sequence out of sync"); |
ysr@777 | 1925 | assert(_recent_evac_times_ms->num() == |
ysr@777 | 1926 | _recent_pause_times_ms->num(), "Sequence out of sync"); |
ysr@777 | 1927 | assert(_recent_pause_times_ms->num() == |
ysr@777 | 1928 | _recent_CS_bytes_used_before->num(), "Sequence out of sync"); |
ysr@777 | 1929 | assert(_recent_CS_bytes_used_before->num() == |
ysr@777 | 1930 | _recent_CS_bytes_surviving->num(), "Sequence out of sync"); |
ysr@777 | 1931 | return _recent_pause_times_ms->num(); |
ysr@777 | 1932 | } |
ysr@777 | 1933 | |
ysr@777 | 1934 | double G1CollectorPolicy::recent_avg_survival_fraction() { |
ysr@777 | 1935 | return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, |
ysr@777 | 1936 | _recent_CS_bytes_used_before); |
ysr@777 | 1937 | } |
ysr@777 | 1938 | |
ysr@777 | 1939 | double G1CollectorPolicy::last_survival_fraction() { |
ysr@777 | 1940 | return last_survival_fraction_work(_recent_CS_bytes_surviving, |
ysr@777 | 1941 | _recent_CS_bytes_used_before); |
ysr@777 | 1942 | } |
ysr@777 | 1943 | |
ysr@777 | 1944 | double |
ysr@777 | 1945 | G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, |
ysr@777 | 1946 | TruncatedSeq* before) { |
ysr@777 | 1947 | assert(surviving->num() == before->num(), "Sequence out of sync"); |
ysr@777 | 1948 | if (before->sum() > 0.0) { |
ysr@777 | 1949 | double recent_survival_rate = surviving->sum() / before->sum(); |
ysr@777 | 1950 | // We exempt parallel collection from this check because Alloc Buffer |
ysr@777 | 1951 | // fragmentation can produce negative collections. |
ysr@777 | 1952 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 1953 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 1954 | // (DLD, 10/05.) |
ysr@777 | 1955 | assert((true || ParallelGCThreads > 0) || |
ysr@777 | 1956 | _g1->evacuation_failed() || |
ysr@777 | 1957 | recent_survival_rate <= 1.0, "Or bad frac"); |
ysr@777 | 1958 | return recent_survival_rate; |
ysr@777 | 1959 | } else { |
ysr@777 | 1960 | return 1.0; // Be conservative. |
ysr@777 | 1961 | } |
ysr@777 | 1962 | } |
ysr@777 | 1963 | |
ysr@777 | 1964 | double |
ysr@777 | 1965 | G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, |
ysr@777 | 1966 | TruncatedSeq* before) { |
ysr@777 | 1967 | assert(surviving->num() == before->num(), "Sequence out of sync"); |
ysr@777 | 1968 | if (surviving->num() > 0 && before->last() > 0.0) { |
ysr@777 | 1969 | double last_survival_rate = surviving->last() / before->last(); |
ysr@777 | 1970 | // We exempt parallel collection from this check because Alloc Buffer |
ysr@777 | 1971 | // fragmentation can produce negative collections. |
ysr@777 | 1972 | // Further, we're now always doing parallel collection. But I'm still |
ysr@777 | 1973 | // leaving this here as a placeholder for a more precise assertion later. |
ysr@777 | 1974 | // (DLD, 10/05.) |
ysr@777 | 1975 | assert((true || ParallelGCThreads > 0) || |
ysr@777 | 1976 | last_survival_rate <= 1.0, "Or bad frac"); |
ysr@777 | 1977 | return last_survival_rate; |
ysr@777 | 1978 | } else { |
ysr@777 | 1979 | return 1.0; |
ysr@777 | 1980 | } |
ysr@777 | 1981 | } |
ysr@777 | 1982 | |
ysr@777 | 1983 | static const int survival_min_obs = 5; |
ysr@777 | 1984 | static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; |
ysr@777 | 1985 | static const double min_survival_rate = 0.1; |
ysr@777 | 1986 | |
ysr@777 | 1987 | double |
ysr@777 | 1988 | G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, |
ysr@777 | 1989 | double latest) { |
ysr@777 | 1990 | double res = avg; |
ysr@777 | 1991 | if (number_of_recent_gcs() < survival_min_obs) { |
ysr@777 | 1992 | res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); |
ysr@777 | 1993 | } |
ysr@777 | 1994 | res = MAX2(res, latest); |
ysr@777 | 1995 | res = MAX2(res, min_survival_rate); |
ysr@777 | 1996 | // In the parallel case, LAB fragmentation can produce "negative |
ysr@777 | 1997 | // collections"; so can evac failure. Cap at 1.0 |
ysr@777 | 1998 | res = MIN2(res, 1.0); |
ysr@777 | 1999 | return res; |
ysr@777 | 2000 | } |
ysr@777 | 2001 | |
ysr@777 | 2002 | size_t G1CollectorPolicy::expansion_amount() { |
tonyp@1791 | 2003 | if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
johnc@1186 | 2004 | // We will double the existing space, or take |
johnc@1186 | 2005 | // G1ExpandByPercentOfAvailable % of the available expansion |
johnc@1186 | 2006 | // space, whichever is smaller, bounded below by a minimum |
johnc@1186 | 2007 | // expansion (unless that's all that's left.) |
ysr@777 | 2008 | const size_t min_expand_bytes = 1*M; |
ysr@777 | 2009 | size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); |
ysr@777 | 2010 | size_t committed_bytes = _g1->capacity(); |
ysr@777 | 2011 | size_t uncommitted_bytes = reserved_bytes - committed_bytes; |
ysr@777 | 2012 | size_t expand_bytes; |
ysr@777 | 2013 | size_t expand_bytes_via_pct = |
johnc@1186 | 2014 | uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
ysr@777 | 2015 | expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
ysr@777 | 2016 | expand_bytes = MAX2(expand_bytes, min_expand_bytes); |
ysr@777 | 2017 | expand_bytes = MIN2(expand_bytes, uncommitted_bytes); |
ysr@777 | 2018 | if (G1PolicyVerbose > 1) { |
ysr@777 | 2019 | gclog_or_tty->print("Decided to expand: ratio = %5.2f, " |
ysr@777 | 2020 | "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" |
ysr@777 | 2021 | " Answer = %d.\n", |
ysr@777 | 2022 | recent_avg_pause_time_ratio(), |
ysr@777 | 2023 | byte_size_in_proper_unit(committed_bytes), |
ysr@777 | 2024 | proper_unit_for_byte_size(committed_bytes), |
ysr@777 | 2025 | byte_size_in_proper_unit(uncommitted_bytes), |
ysr@777 | 2026 | proper_unit_for_byte_size(uncommitted_bytes), |
ysr@777 | 2027 | byte_size_in_proper_unit(expand_bytes_via_pct), |
ysr@777 | 2028 | proper_unit_for_byte_size(expand_bytes_via_pct), |
ysr@777 | 2029 | byte_size_in_proper_unit(expand_bytes), |
ysr@777 | 2030 | proper_unit_for_byte_size(expand_bytes)); |
ysr@777 | 2031 | } |
ysr@777 | 2032 | return expand_bytes; |
ysr@777 | 2033 | } else { |
ysr@777 | 2034 | return 0; |
ysr@777 | 2035 | } |
ysr@777 | 2036 | } |
ysr@777 | 2037 | |
ysr@777 | 2038 | void G1CollectorPolicy::note_start_of_mark_thread() { |
ysr@777 | 2039 | _mark_thread_startup_sec = os::elapsedTime(); |
ysr@777 | 2040 | } |
ysr@777 | 2041 | |
ysr@777 | 2042 | class CountCSClosure: public HeapRegionClosure { |
ysr@777 | 2043 | G1CollectorPolicy* _g1_policy; |
ysr@777 | 2044 | public: |
ysr@777 | 2045 | CountCSClosure(G1CollectorPolicy* g1_policy) : |
ysr@777 | 2046 | _g1_policy(g1_policy) {} |
ysr@777 | 2047 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2048 | _g1_policy->_bytes_in_collection_set_before_gc += r->used(); |
ysr@777 | 2049 | return false; |
ysr@777 | 2050 | } |
ysr@777 | 2051 | }; |
ysr@777 | 2052 | |
ysr@777 | 2053 | void G1CollectorPolicy::count_CS_bytes_used() { |
ysr@777 | 2054 | CountCSClosure cs_closure(this); |
ysr@777 | 2055 | _g1->collection_set_iterate(&cs_closure); |
ysr@777 | 2056 | } |
ysr@777 | 2057 | |
ysr@777 | 2058 | static void print_indent(int level) { |
ysr@777 | 2059 | for (int j = 0; j < level+1; ++j) |
ysr@777 | 2060 | gclog_or_tty->print(" "); |
ysr@777 | 2061 | } |
ysr@777 | 2062 | |
ysr@777 | 2063 | void G1CollectorPolicy::print_summary (int level, |
ysr@777 | 2064 | const char* str, |
ysr@777 | 2065 | NumberSeq* seq) const { |
ysr@777 | 2066 | double sum = seq->sum(); |
ysr@777 | 2067 | print_indent(level); |
ysr@777 | 2068 | gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
ysr@777 | 2069 | str, sum / 1000.0, seq->avg()); |
ysr@777 | 2070 | } |
ysr@777 | 2071 | |
ysr@777 | 2072 | void G1CollectorPolicy::print_summary_sd (int level, |
ysr@777 | 2073 | const char* str, |
ysr@777 | 2074 | NumberSeq* seq) const { |
ysr@777 | 2075 | print_summary(level, str, seq); |
ysr@777 | 2076 | print_indent(level + 5); |
ysr@777 | 2077 | gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
ysr@777 | 2078 | seq->num(), seq->sd(), seq->maximum()); |
ysr@777 | 2079 | } |
ysr@777 | 2080 | |
ysr@777 | 2081 | void G1CollectorPolicy::check_other_times(int level, |
ysr@777 | 2082 | NumberSeq* other_times_ms, |
ysr@777 | 2083 | NumberSeq* calc_other_times_ms) const { |
ysr@777 | 2084 | bool should_print = false; |
ysr@777 | 2085 | |
ysr@777 | 2086 | double max_sum = MAX2(fabs(other_times_ms->sum()), |
ysr@777 | 2087 | fabs(calc_other_times_ms->sum())); |
ysr@777 | 2088 | double min_sum = MIN2(fabs(other_times_ms->sum()), |
ysr@777 | 2089 | fabs(calc_other_times_ms->sum())); |
ysr@777 | 2090 | double sum_ratio = max_sum / min_sum; |
ysr@777 | 2091 | if (sum_ratio > 1.1) { |
ysr@777 | 2092 | should_print = true; |
ysr@777 | 2093 | print_indent(level + 1); |
ysr@777 | 2094 | gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
ysr@777 | 2095 | } |
ysr@777 | 2096 | |
ysr@777 | 2097 | double max_avg = MAX2(fabs(other_times_ms->avg()), |
ysr@777 | 2098 | fabs(calc_other_times_ms->avg())); |
ysr@777 | 2099 | double min_avg = MIN2(fabs(other_times_ms->avg()), |
ysr@777 | 2100 | fabs(calc_other_times_ms->avg())); |
ysr@777 | 2101 | double avg_ratio = max_avg / min_avg; |
ysr@777 | 2102 | if (avg_ratio > 1.1) { |
ysr@777 | 2103 | should_print = true; |
ysr@777 | 2104 | print_indent(level + 1); |
ysr@777 | 2105 | gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
ysr@777 | 2106 | } |
ysr@777 | 2107 | |
ysr@777 | 2108 | if (other_times_ms->sum() < -0.01) { |
ysr@777 | 2109 | print_indent(level + 1); |
ysr@777 | 2110 | gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
ysr@777 | 2111 | } |
ysr@777 | 2112 | |
ysr@777 | 2113 | if (other_times_ms->avg() < -0.01) { |
ysr@777 | 2114 | print_indent(level + 1); |
ysr@777 | 2115 | gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
ysr@777 | 2116 | } |
ysr@777 | 2117 | |
ysr@777 | 2118 | if (calc_other_times_ms->sum() < -0.01) { |
ysr@777 | 2119 | should_print = true; |
ysr@777 | 2120 | print_indent(level + 1); |
ysr@777 | 2121 | gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
ysr@777 | 2122 | } |
ysr@777 | 2123 | |
ysr@777 | 2124 | if (calc_other_times_ms->avg() < -0.01) { |
ysr@777 | 2125 | should_print = true; |
ysr@777 | 2126 | print_indent(level + 1); |
ysr@777 | 2127 | gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
ysr@777 | 2128 | } |
ysr@777 | 2129 | |
ysr@777 | 2130 | if (should_print) |
ysr@777 | 2131 | print_summary(level, "Other(Calc)", calc_other_times_ms); |
ysr@777 | 2132 | } |
ysr@777 | 2133 | |
ysr@777 | 2134 | void G1CollectorPolicy::print_summary(PauseSummary* summary) const { |
ysr@777 | 2135 | bool parallel = ParallelGCThreads > 0; |
ysr@777 | 2136 | MainBodySummary* body_summary = summary->main_body_summary(); |
ysr@777 | 2137 | if (summary->get_total_seq()->num() > 0) { |
apetrusenko@1112 | 2138 | print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
ysr@777 | 2139 | if (body_summary != NULL) { |
ysr@777 | 2140 | print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); |
ysr@777 | 2141 | if (parallel) { |
ysr@777 | 2142 | print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); |
ysr@777 | 2143 | print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
ysr@777 | 2144 | print_summary(2, "Ext Root Scanning", |
ysr@777 | 2145 | body_summary->get_ext_root_scan_seq()); |
ysr@777 | 2146 | print_summary(2, "Mark Stack Scanning", |
ysr@777 | 2147 | body_summary->get_mark_stack_scan_seq()); |
ysr@777 | 2148 | print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); |
ysr@777 | 2149 | print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); |
ysr@777 | 2150 | print_summary(2, "Termination", body_summary->get_termination_seq()); |
ysr@777 | 2151 | print_summary(2, "Other", body_summary->get_parallel_other_seq()); |
ysr@777 | 2152 | { |
ysr@777 | 2153 | NumberSeq* other_parts[] = { |
ysr@777 | 2154 | body_summary->get_update_rs_seq(), |
ysr@777 | 2155 | body_summary->get_ext_root_scan_seq(), |
ysr@777 | 2156 | body_summary->get_mark_stack_scan_seq(), |
ysr@777 | 2157 | body_summary->get_scan_rs_seq(), |
ysr@777 | 2158 | body_summary->get_obj_copy_seq(), |
ysr@777 | 2159 | body_summary->get_termination_seq() |
ysr@777 | 2160 | }; |
ysr@777 | 2161 | NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), |
ysr@777 | 2162 | 7, other_parts); |
ysr@777 | 2163 | check_other_times(2, body_summary->get_parallel_other_seq(), |
ysr@777 | 2164 | &calc_other_times_ms); |
ysr@777 | 2165 | } |
ysr@777 | 2166 | print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
ysr@777 | 2167 | print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); |
ysr@777 | 2168 | } else { |
ysr@777 | 2169 | print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
ysr@777 | 2170 | print_summary(1, "Ext Root Scanning", |
ysr@777 | 2171 | body_summary->get_ext_root_scan_seq()); |
ysr@777 | 2172 | print_summary(1, "Mark Stack Scanning", |
ysr@777 | 2173 | body_summary->get_mark_stack_scan_seq()); |
ysr@777 | 2174 | print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); |
ysr@777 | 2175 | print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); |
ysr@777 | 2176 | } |
ysr@777 | 2177 | } |
ysr@777 | 2178 | print_summary(1, "Other", summary->get_other_seq()); |
ysr@777 | 2179 | { |
ysr@777 | 2180 | NumberSeq calc_other_times_ms; |
ysr@777 | 2181 | if (body_summary != NULL) { |
ysr@777 | 2182 | // not abandoned |
ysr@777 | 2183 | if (parallel) { |
ysr@777 | 2184 | // parallel |
ysr@777 | 2185 | NumberSeq* other_parts[] = { |
ysr@777 | 2186 | body_summary->get_satb_drain_seq(), |
ysr@777 | 2187 | body_summary->get_parallel_seq(), |
ysr@777 | 2188 | body_summary->get_clear_ct_seq() |
ysr@777 | 2189 | }; |
apetrusenko@1112 | 2190 | calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
apetrusenko@1112 | 2191 | 3, other_parts); |
ysr@777 | 2192 | } else { |
ysr@777 | 2193 | // serial |
ysr@777 | 2194 | NumberSeq* other_parts[] = { |
ysr@777 | 2195 | body_summary->get_satb_drain_seq(), |
ysr@777 | 2196 | body_summary->get_update_rs_seq(), |
ysr@777 | 2197 | body_summary->get_ext_root_scan_seq(), |
ysr@777 | 2198 | body_summary->get_mark_stack_scan_seq(), |
ysr@777 | 2199 | body_summary->get_scan_rs_seq(), |
ysr@777 | 2200 | body_summary->get_obj_copy_seq() |
ysr@777 | 2201 | }; |
ysr@777 | 2202 | calc_other_times_ms = NumberSeq(summary->get_total_seq(), |
apetrusenko@1112 | 2203 | 7, other_parts); |
ysr@777 | 2204 | } |
ysr@777 | 2205 | } else { |
ysr@777 | 2206 | // abandoned |
apetrusenko@1112 | 2207 | calc_other_times_ms = NumberSeq(); |
ysr@777 | 2208 | } |
ysr@777 | 2209 | check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); |
ysr@777 | 2210 | } |
ysr@777 | 2211 | } else { |
ysr@777 | 2212 | print_indent(0); |
ysr@777 | 2213 | gclog_or_tty->print_cr("none"); |
ysr@777 | 2214 | } |
ysr@777 | 2215 | gclog_or_tty->print_cr(""); |
ysr@777 | 2216 | } |
ysr@777 | 2217 | |
ysr@777 | 2218 | void |
apetrusenko@1112 | 2219 | G1CollectorPolicy::print_abandoned_summary(PauseSummary* summary) const { |
ysr@777 | 2220 | bool printed = false; |
apetrusenko@1112 | 2221 | if (summary->get_total_seq()->num() > 0) { |
ysr@777 | 2222 | printed = true; |
apetrusenko@1112 | 2223 | print_summary(summary); |
ysr@777 | 2224 | } |
ysr@777 | 2225 | if (!printed) { |
ysr@777 | 2226 | print_indent(0); |
ysr@777 | 2227 | gclog_or_tty->print_cr("none"); |
ysr@777 | 2228 | gclog_or_tty->print_cr(""); |
ysr@777 | 2229 | } |
ysr@777 | 2230 | } |
ysr@777 | 2231 | |
ysr@777 | 2232 | void G1CollectorPolicy::print_tracing_info() const { |
ysr@777 | 2233 | if (TraceGen0Time) { |
ysr@777 | 2234 | gclog_or_tty->print_cr("ALL PAUSES"); |
ysr@777 | 2235 | print_summary_sd(0, "Total", _all_pause_times_ms); |
ysr@777 | 2236 | gclog_or_tty->print_cr(""); |
ysr@777 | 2237 | gclog_or_tty->print_cr(""); |
ysr@777 | 2238 | gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); |
ysr@777 | 2239 | gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); |
ysr@777 | 2240 | gclog_or_tty->print_cr(""); |
ysr@777 | 2241 | |
apetrusenko@1112 | 2242 | gclog_or_tty->print_cr("EVACUATION PAUSES"); |
apetrusenko@1112 | 2243 | print_summary(_summary); |
ysr@777 | 2244 | |
ysr@777 | 2245 | gclog_or_tty->print_cr("ABANDONED PAUSES"); |
apetrusenko@1112 | 2246 | print_abandoned_summary(_abandoned_summary); |
ysr@777 | 2247 | |
ysr@777 | 2248 | gclog_or_tty->print_cr("MISC"); |
ysr@777 | 2249 | print_summary_sd(0, "Stop World", _all_stop_world_times_ms); |
ysr@777 | 2250 | print_summary_sd(0, "Yields", _all_yield_times_ms); |
ysr@777 | 2251 | for (int i = 0; i < _aux_num; ++i) { |
ysr@777 | 2252 | if (_all_aux_times_ms[i].num() > 0) { |
ysr@777 | 2253 | char buffer[96]; |
ysr@777 | 2254 | sprintf(buffer, "Aux%d", i); |
ysr@777 | 2255 | print_summary_sd(0, buffer, &_all_aux_times_ms[i]); |
ysr@777 | 2256 | } |
ysr@777 | 2257 | } |
ysr@777 | 2258 | |
ysr@777 | 2259 | size_t all_region_num = _region_num_young + _region_num_tenured; |
ysr@777 | 2260 | gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " |
ysr@777 | 2261 | "Tenured %8d (%6.2lf%%)", |
ysr@777 | 2262 | all_region_num, |
ysr@777 | 2263 | _region_num_young, |
ysr@777 | 2264 | (double) _region_num_young / (double) all_region_num * 100.0, |
ysr@777 | 2265 | _region_num_tenured, |
ysr@777 | 2266 | (double) _region_num_tenured / (double) all_region_num * 100.0); |
ysr@777 | 2267 | } |
ysr@777 | 2268 | if (TraceGen1Time) { |
ysr@777 | 2269 | if (_all_full_gc_times_ms->num() > 0) { |
ysr@777 | 2270 | gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", |
ysr@777 | 2271 | _all_full_gc_times_ms->num(), |
ysr@777 | 2272 | _all_full_gc_times_ms->sum() / 1000.0); |
ysr@777 | 2273 | gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); |
ysr@777 | 2274 | gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", |
ysr@777 | 2275 | _all_full_gc_times_ms->sd(), |
ysr@777 | 2276 | _all_full_gc_times_ms->maximum()); |
ysr@777 | 2277 | } |
ysr@777 | 2278 | } |
ysr@777 | 2279 | } |
ysr@777 | 2280 | |
ysr@777 | 2281 | void G1CollectorPolicy::print_yg_surv_rate_info() const { |
ysr@777 | 2282 | #ifndef PRODUCT |
ysr@777 | 2283 | _short_lived_surv_rate_group->print_surv_rate_summary(); |
ysr@777 | 2284 | // add this call for any other surv rate groups |
ysr@777 | 2285 | #endif // PRODUCT |
ysr@777 | 2286 | } |
ysr@777 | 2287 | |
ysr@777 | 2288 | bool |
ysr@777 | 2289 | G1CollectorPolicy::should_add_next_region_to_young_list() { |
ysr@777 | 2290 | assert(in_young_gc_mode(), "should be in young GC mode"); |
ysr@777 | 2291 | bool ret; |
johnc@1829 | 2292 | size_t young_list_length = _g1->young_list()->length(); |
apetrusenko@980 | 2293 | size_t young_list_max_length = _young_list_target_length; |
apetrusenko@980 | 2294 | if (G1FixedEdenSize) { |
apetrusenko@980 | 2295 | young_list_max_length -= _max_survivor_regions; |
apetrusenko@980 | 2296 | } |
apetrusenko@980 | 2297 | if (young_list_length < young_list_max_length) { |
ysr@777 | 2298 | ret = true; |
ysr@777 | 2299 | ++_region_num_young; |
ysr@777 | 2300 | } else { |
ysr@777 | 2301 | ret = false; |
ysr@777 | 2302 | ++_region_num_tenured; |
ysr@777 | 2303 | } |
ysr@777 | 2304 | |
ysr@777 | 2305 | return ret; |
ysr@777 | 2306 | } |
ysr@777 | 2307 | |
ysr@777 | 2308 | #ifndef PRODUCT |
ysr@777 | 2309 | // for debugging, bit of a hack... |
ysr@777 | 2310 | static char* |
ysr@777 | 2311 | region_num_to_mbs(int length) { |
ysr@777 | 2312 | static char buffer[64]; |
ysr@777 | 2313 | double bytes = (double) (length * HeapRegion::GrainBytes); |
ysr@777 | 2314 | double mbs = bytes / (double) (1024 * 1024); |
ysr@777 | 2315 | sprintf(buffer, "%7.2lfMB", mbs); |
ysr@777 | 2316 | return buffer; |
ysr@777 | 2317 | } |
ysr@777 | 2318 | #endif // PRODUCT |
ysr@777 | 2319 | |
apetrusenko@980 | 2320 | size_t G1CollectorPolicy::max_regions(int purpose) { |
ysr@777 | 2321 | switch (purpose) { |
ysr@777 | 2322 | case GCAllocForSurvived: |
apetrusenko@980 | 2323 | return _max_survivor_regions; |
ysr@777 | 2324 | case GCAllocForTenured: |
apetrusenko@980 | 2325 | return REGIONS_UNLIMITED; |
ysr@777 | 2326 | default: |
apetrusenko@980 | 2327 | ShouldNotReachHere(); |
apetrusenko@980 | 2328 | return REGIONS_UNLIMITED; |
ysr@777 | 2329 | }; |
ysr@777 | 2330 | } |
ysr@777 | 2331 | |
apetrusenko@980 | 2332 | // Calculates survivor space parameters. |
apetrusenko@980 | 2333 | void G1CollectorPolicy::calculate_survivors_policy() |
apetrusenko@980 | 2334 | { |
apetrusenko@980 | 2335 | if (G1FixedSurvivorSpaceSize == 0) { |
apetrusenko@980 | 2336 | _max_survivor_regions = _young_list_target_length / SurvivorRatio; |
apetrusenko@980 | 2337 | } else { |
apetrusenko@982 | 2338 | _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
apetrusenko@980 | 2339 | } |
apetrusenko@980 | 2340 | |
apetrusenko@980 | 2341 | if (G1FixedTenuringThreshold) { |
apetrusenko@980 | 2342 | _tenuring_threshold = MaxTenuringThreshold; |
apetrusenko@980 | 2343 | } else { |
apetrusenko@980 | 2344 | _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
apetrusenko@980 | 2345 | HeapRegion::GrainWords * _max_survivor_regions); |
apetrusenko@980 | 2346 | } |
apetrusenko@980 | 2347 | } |
apetrusenko@980 | 2348 | |
ysr@777 | 2349 | bool |
ysr@777 | 2350 | G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t |
ysr@777 | 2351 | word_size) { |
ysr@777 | 2352 | assert(_g1->regions_accounted_for(), "Region leakage!"); |
ysr@777 | 2353 | double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
ysr@777 | 2354 | |
johnc@1829 | 2355 | size_t young_list_length = _g1->young_list()->length(); |
apetrusenko@980 | 2356 | size_t young_list_max_length = _young_list_target_length; |
apetrusenko@980 | 2357 | if (G1FixedEdenSize) { |
apetrusenko@980 | 2358 | young_list_max_length -= _max_survivor_regions; |
apetrusenko@980 | 2359 | } |
apetrusenko@980 | 2360 | bool reached_target_length = young_list_length >= young_list_max_length; |
ysr@777 | 2361 | |
ysr@777 | 2362 | if (in_young_gc_mode()) { |
ysr@777 | 2363 | if (reached_target_length) { |
johnc@1829 | 2364 | assert( young_list_length > 0 && _g1->young_list()->length() > 0, |
ysr@777 | 2365 | "invariant" ); |
ysr@777 | 2366 | return true; |
ysr@777 | 2367 | } |
ysr@777 | 2368 | } else { |
ysr@777 | 2369 | guarantee( false, "should not reach here" ); |
ysr@777 | 2370 | } |
ysr@777 | 2371 | |
ysr@777 | 2372 | return false; |
ysr@777 | 2373 | } |
ysr@777 | 2374 | |
ysr@777 | 2375 | #ifndef PRODUCT |
ysr@777 | 2376 | class HRSortIndexIsOKClosure: public HeapRegionClosure { |
ysr@777 | 2377 | CollectionSetChooser* _chooser; |
ysr@777 | 2378 | public: |
ysr@777 | 2379 | HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : |
ysr@777 | 2380 | _chooser(chooser) {} |
ysr@777 | 2381 | |
ysr@777 | 2382 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2383 | if (!r->continuesHumongous()) { |
ysr@777 | 2384 | assert(_chooser->regionProperlyOrdered(r), "Ought to be."); |
ysr@777 | 2385 | } |
ysr@777 | 2386 | return false; |
ysr@777 | 2387 | } |
ysr@777 | 2388 | }; |
ysr@777 | 2389 | |
ysr@777 | 2390 | bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { |
ysr@777 | 2391 | HRSortIndexIsOKClosure cl(_collectionSetChooser); |
ysr@777 | 2392 | _g1->heap_region_iterate(&cl); |
ysr@777 | 2393 | return true; |
ysr@777 | 2394 | } |
ysr@777 | 2395 | #endif |
ysr@777 | 2396 | |
tonyp@2011 | 2397 | bool |
tonyp@2011 | 2398 | G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
tonyp@2011 | 2399 | bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
tonyp@2011 | 2400 | if (!during_cycle) { |
tonyp@2011 | 2401 | set_initiate_conc_mark_if_possible(); |
tonyp@2011 | 2402 | return true; |
tonyp@2011 | 2403 | } else { |
tonyp@2011 | 2404 | return false; |
tonyp@2011 | 2405 | } |
tonyp@2011 | 2406 | } |
tonyp@2011 | 2407 | |
ysr@777 | 2408 | void |
tonyp@1794 | 2409 | G1CollectorPolicy::decide_on_conc_mark_initiation() { |
tonyp@1794 | 2410 | // We are about to decide on whether this pause will be an |
tonyp@1794 | 2411 | // initial-mark pause. |
tonyp@1794 | 2412 | |
tonyp@1794 | 2413 | // First, during_initial_mark_pause() should not be already set. We |
tonyp@1794 | 2414 | // will set it here if we have to. However, it should be cleared by |
tonyp@1794 | 2415 | // the end of the pause (it's only set for the duration of an |
tonyp@1794 | 2416 | // initial-mark pause). |
tonyp@1794 | 2417 | assert(!during_initial_mark_pause(), "pre-condition"); |
tonyp@1794 | 2418 | |
tonyp@1794 | 2419 | if (initiate_conc_mark_if_possible()) { |
tonyp@1794 | 2420 | // We had noticed on a previous pause that the heap occupancy has |
tonyp@1794 | 2421 | // gone over the initiating threshold and we should start a |
tonyp@1794 | 2422 | // concurrent marking cycle. So we might initiate one. |
tonyp@1794 | 2423 | |
tonyp@1794 | 2424 | bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
tonyp@1794 | 2425 | if (!during_cycle) { |
tonyp@1794 | 2426 | // The concurrent marking thread is not "during a cycle", i.e., |
tonyp@1794 | 2427 | // it has completed the last one. So we can go ahead and |
tonyp@1794 | 2428 | // initiate a new cycle. |
tonyp@1794 | 2429 | |
tonyp@1794 | 2430 | set_during_initial_mark_pause(); |
tonyp@1794 | 2431 | |
tonyp@1794 | 2432 | // And we can now clear initiate_conc_mark_if_possible() as |
tonyp@1794 | 2433 | // we've already acted on it. |
tonyp@1794 | 2434 | clear_initiate_conc_mark_if_possible(); |
tonyp@1794 | 2435 | } else { |
tonyp@1794 | 2436 | // The concurrent marking thread is still finishing up the |
tonyp@1794 | 2437 | // previous cycle. If we start one right now the two cycles |
tonyp@1794 | 2438 | // overlap. In particular, the concurrent marking thread might |
tonyp@1794 | 2439 | // be in the process of clearing the next marking bitmap (which |
tonyp@1794 | 2440 | // we will use for the next cycle if we start one). Starting a |
tonyp@1794 | 2441 | // cycle now will be bad given that parts of the marking |
tonyp@1794 | 2442 | // information might get cleared by the marking thread. And we |
tonyp@1794 | 2443 | // cannot wait for the marking thread to finish the cycle as it |
tonyp@1794 | 2444 | // periodically yields while clearing the next marking bitmap |
tonyp@1794 | 2445 | // and, if it's in a yield point, it's waiting for us to |
tonyp@1794 | 2446 | // finish. So, at this point we will not start a cycle and we'll |
tonyp@1794 | 2447 | // let the concurrent marking thread complete the last one. |
tonyp@1794 | 2448 | } |
tonyp@1794 | 2449 | } |
tonyp@1794 | 2450 | } |
tonyp@1794 | 2451 | |
tonyp@1794 | 2452 | void |
ysr@777 | 2453 | G1CollectorPolicy_BestRegionsFirst:: |
ysr@777 | 2454 | record_collection_pause_start(double start_time_sec, size_t start_used) { |
ysr@777 | 2455 | G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); |
ysr@777 | 2456 | } |
ysr@777 | 2457 | |
ysr@777 | 2458 | class NextNonCSElemFinder: public HeapRegionClosure { |
ysr@777 | 2459 | HeapRegion* _res; |
ysr@777 | 2460 | public: |
ysr@777 | 2461 | NextNonCSElemFinder(): _res(NULL) {} |
ysr@777 | 2462 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2463 | if (!r->in_collection_set()) { |
ysr@777 | 2464 | _res = r; |
ysr@777 | 2465 | return true; |
ysr@777 | 2466 | } else { |
ysr@777 | 2467 | return false; |
ysr@777 | 2468 | } |
ysr@777 | 2469 | } |
ysr@777 | 2470 | HeapRegion* res() { return _res; } |
ysr@777 | 2471 | }; |
ysr@777 | 2472 | |
ysr@777 | 2473 | class KnownGarbageClosure: public HeapRegionClosure { |
ysr@777 | 2474 | CollectionSetChooser* _hrSorted; |
ysr@777 | 2475 | |
ysr@777 | 2476 | public: |
ysr@777 | 2477 | KnownGarbageClosure(CollectionSetChooser* hrSorted) : |
ysr@777 | 2478 | _hrSorted(hrSorted) |
ysr@777 | 2479 | {} |
ysr@777 | 2480 | |
ysr@777 | 2481 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2482 | // We only include humongous regions in collection |
ysr@777 | 2483 | // sets when concurrent mark shows that their contained object is |
ysr@777 | 2484 | // unreachable. |
ysr@777 | 2485 | |
ysr@777 | 2486 | // Do we have any marking information for this region? |
ysr@777 | 2487 | if (r->is_marked()) { |
ysr@777 | 2488 | // We don't include humongous regions in collection |
ysr@777 | 2489 | // sets because we collect them immediately at the end of a marking |
ysr@777 | 2490 | // cycle. We also don't include young regions because we *must* |
ysr@777 | 2491 | // include them in the next collection pause. |
ysr@777 | 2492 | if (!r->isHumongous() && !r->is_young()) { |
ysr@777 | 2493 | _hrSorted->addMarkedHeapRegion(r); |
ysr@777 | 2494 | } |
ysr@777 | 2495 | } |
ysr@777 | 2496 | return false; |
ysr@777 | 2497 | } |
ysr@777 | 2498 | }; |
ysr@777 | 2499 | |
ysr@777 | 2500 | class ParKnownGarbageHRClosure: public HeapRegionClosure { |
ysr@777 | 2501 | CollectionSetChooser* _hrSorted; |
ysr@777 | 2502 | jint _marked_regions_added; |
ysr@777 | 2503 | jint _chunk_size; |
ysr@777 | 2504 | jint _cur_chunk_idx; |
ysr@777 | 2505 | jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) |
ysr@777 | 2506 | int _worker; |
ysr@777 | 2507 | int _invokes; |
ysr@777 | 2508 | |
ysr@777 | 2509 | void get_new_chunk() { |
ysr@777 | 2510 | _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); |
ysr@777 | 2511 | _cur_chunk_end = _cur_chunk_idx + _chunk_size; |
ysr@777 | 2512 | } |
ysr@777 | 2513 | void add_region(HeapRegion* r) { |
ysr@777 | 2514 | if (_cur_chunk_idx == _cur_chunk_end) { |
ysr@777 | 2515 | get_new_chunk(); |
ysr@777 | 2516 | } |
ysr@777 | 2517 | assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); |
ysr@777 | 2518 | _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); |
ysr@777 | 2519 | _marked_regions_added++; |
ysr@777 | 2520 | _cur_chunk_idx++; |
ysr@777 | 2521 | } |
ysr@777 | 2522 | |
ysr@777 | 2523 | public: |
ysr@777 | 2524 | ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, |
ysr@777 | 2525 | jint chunk_size, |
ysr@777 | 2526 | int worker) : |
ysr@777 | 2527 | _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), |
ysr@777 | 2528 | _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), |
ysr@777 | 2529 | _invokes(0) |
ysr@777 | 2530 | {} |
ysr@777 | 2531 | |
ysr@777 | 2532 | bool doHeapRegion(HeapRegion* r) { |
ysr@777 | 2533 | // We only include humongous regions in collection |
ysr@777 | 2534 | // sets when concurrent mark shows that their contained object is |
ysr@777 | 2535 | // unreachable. |
ysr@777 | 2536 | _invokes++; |
ysr@777 | 2537 | |
ysr@777 | 2538 | // Do we have any marking information for this region? |
ysr@777 | 2539 | if (r->is_marked()) { |
ysr@777 | 2540 | // We don't include humongous regions in collection |
ysr@777 | 2541 | // sets because we collect them immediately at the end of a marking |
ysr@777 | 2542 | // cycle. |
ysr@777 | 2543 | // We also do not include young regions in collection sets |
ysr@777 | 2544 | if (!r->isHumongous() && !r->is_young()) { |
ysr@777 | 2545 | add_region(r); |
ysr@777 | 2546 | } |
ysr@777 | 2547 | } |
ysr@777 | 2548 | return false; |
ysr@777 | 2549 | } |
ysr@777 | 2550 | jint marked_regions_added() { return _marked_regions_added; } |
ysr@777 | 2551 | int invokes() { return _invokes; } |
ysr@777 | 2552 | }; |
ysr@777 | 2553 | |
ysr@777 | 2554 | class ParKnownGarbageTask: public AbstractGangTask { |
ysr@777 | 2555 | CollectionSetChooser* _hrSorted; |
ysr@777 | 2556 | jint _chunk_size; |
ysr@777 | 2557 | G1CollectedHeap* _g1; |
ysr@777 | 2558 | public: |
ysr@777 | 2559 | ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : |
ysr@777 | 2560 | AbstractGangTask("ParKnownGarbageTask"), |
ysr@777 | 2561 | _hrSorted(hrSorted), _chunk_size(chunk_size), |
ysr@777 | 2562 | _g1(G1CollectedHeap::heap()) |
ysr@777 | 2563 | {} |
ysr@777 | 2564 | |
ysr@777 | 2565 | void work(int i) { |
ysr@777 | 2566 | ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); |
ysr@777 | 2567 | // Back to zero for the claim value. |
tonyp@790 | 2568 | _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
tonyp@790 | 2569 | HeapRegion::InitialClaimValue); |
ysr@777 | 2570 | jint regions_added = parKnownGarbageCl.marked_regions_added(); |
ysr@777 | 2571 | _hrSorted->incNumMarkedHeapRegions(regions_added); |
ysr@777 | 2572 | if (G1PrintParCleanupStats) { |
ysr@777 | 2573 | gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", |
ysr@777 | 2574 | i, parKnownGarbageCl.invokes(), regions_added); |
ysr@777 | 2575 | } |
ysr@777 | 2576 | } |
ysr@777 | 2577 | }; |
ysr@777 | 2578 | |
ysr@777 | 2579 | void |
ysr@777 | 2580 | G1CollectorPolicy_BestRegionsFirst:: |
ysr@777 | 2581 | record_concurrent_mark_cleanup_end(size_t freed_bytes, |
ysr@777 | 2582 | size_t max_live_bytes) { |
ysr@777 | 2583 | double start; |
ysr@777 | 2584 | if (G1PrintParCleanupStats) start = os::elapsedTime(); |
ysr@777 | 2585 | record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); |
ysr@777 | 2586 | |
ysr@777 | 2587 | _collectionSetChooser->clearMarkedHeapRegions(); |
ysr@777 | 2588 | double clear_marked_end; |
ysr@777 | 2589 | if (G1PrintParCleanupStats) { |
ysr@777 | 2590 | clear_marked_end = os::elapsedTime(); |
ysr@777 | 2591 | gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", |
ysr@777 | 2592 | (clear_marked_end - start)*1000.0); |
ysr@777 | 2593 | } |
ysr@777 | 2594 | if (ParallelGCThreads > 0) { |
ysr@777 | 2595 | const size_t OverpartitionFactor = 4; |
kvn@1926 | 2596 | const size_t MinWorkUnit = 8; |
kvn@1926 | 2597 | const size_t WorkUnit = |
ysr@777 | 2598 | MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
kvn@1926 | 2599 | MinWorkUnit); |
ysr@777 | 2600 | _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
kvn@1926 | 2601 | WorkUnit); |
ysr@777 | 2602 | ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
kvn@1926 | 2603 | (int) WorkUnit); |
ysr@777 | 2604 | _g1->workers()->run_task(&parKnownGarbageTask); |
tonyp@790 | 2605 | |
tonyp@790 | 2606 | assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), |
tonyp@790 | 2607 | "sanity check"); |
ysr@777 | 2608 | } else { |
ysr@777 | 2609 | KnownGarbageClosure knownGarbagecl(_collectionSetChooser); |
ysr@777 | 2610 | _g1->heap_region_iterate(&knownGarbagecl); |
ysr@777 | 2611 | } |
ysr@777 | 2612 | double known_garbage_end; |
ysr@777 | 2613 | if (G1PrintParCleanupStats) { |
ysr@777 | 2614 | known_garbage_end = os::elapsedTime(); |
ysr@777 | 2615 | gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
ysr@777 | 2616 | (known_garbage_end - clear_marked_end)*1000.0); |
ysr@777 | 2617 | } |
ysr@777 | 2618 | _collectionSetChooser->sortMarkedHeapRegions(); |
ysr@777 | 2619 | double sort_end; |
ysr@777 | 2620 | if (G1PrintParCleanupStats) { |
ysr@777 | 2621 | sort_end = os::elapsedTime(); |
ysr@777 | 2622 | gclog_or_tty->print_cr(" sorting: %8.3f ms.", |
ysr@777 | 2623 | (sort_end - known_garbage_end)*1000.0); |
ysr@777 | 2624 | } |
ysr@777 | 2625 | |
ysr@777 | 2626 | record_concurrent_mark_cleanup_end_work2(); |
ysr@777 | 2627 | double work2_end; |
ysr@777 | 2628 | if (G1PrintParCleanupStats) { |
ysr@777 | 2629 | work2_end = os::elapsedTime(); |
ysr@777 | 2630 | gclog_or_tty->print_cr(" work2: %8.3f ms.", |
ysr@777 | 2631 | (work2_end - sort_end)*1000.0); |
ysr@777 | 2632 | } |
ysr@777 | 2633 | } |
ysr@777 | 2634 | |
johnc@1829 | 2635 | // Add the heap region at the head of the non-incremental collection set |
ysr@777 | 2636 | void G1CollectorPolicy:: |
ysr@777 | 2637 | add_to_collection_set(HeapRegion* hr) { |
johnc@1829 | 2638 | assert(_inc_cset_build_state == Active, "Precondition"); |
johnc@1829 | 2639 | assert(!hr->is_young(), "non-incremental add of young region"); |
johnc@1829 | 2640 | |
tonyp@1717 | 2641 | if (G1PrintHeapRegions) { |
tonyp@1823 | 2642 | gclog_or_tty->print_cr("added region to cset " |
tonyp@1823 | 2643 | "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
tonyp@1823 | 2644 | "top "PTR_FORMAT", %s", |
tonyp@1823 | 2645 | hr->hrs_index(), hr->bottom(), hr->end(), |
tonyp@1823 | 2646 | hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); |
ysr@777 | 2647 | } |
ysr@777 | 2648 | |
ysr@777 | 2649 | if (_g1->mark_in_progress()) |
ysr@777 | 2650 | _g1->concurrent_mark()->registerCSetRegion(hr); |
ysr@777 | 2651 | |
johnc@1829 | 2652 | assert(!hr->in_collection_set(), "should not already be in the CSet"); |
ysr@777 | 2653 | hr->set_in_collection_set(true); |
ysr@777 | 2654 | hr->set_next_in_collection_set(_collection_set); |
ysr@777 | 2655 | _collection_set = hr; |
ysr@777 | 2656 | _collection_set_size++; |
ysr@777 | 2657 | _collection_set_bytes_used_before += hr->used(); |
tonyp@961 | 2658 | _g1->register_region_with_in_cset_fast_test(hr); |
ysr@777 | 2659 | } |
ysr@777 | 2660 | |
johnc@1829 | 2661 | // Initialize the per-collection-set information |
johnc@1829 | 2662 | void G1CollectorPolicy::start_incremental_cset_building() { |
johnc@1829 | 2663 | assert(_inc_cset_build_state == Inactive, "Precondition"); |
johnc@1829 | 2664 | |
johnc@1829 | 2665 | _inc_cset_head = NULL; |
johnc@1829 | 2666 | _inc_cset_tail = NULL; |
johnc@1829 | 2667 | _inc_cset_size = 0; |
johnc@1829 | 2668 | _inc_cset_bytes_used_before = 0; |
johnc@1829 | 2669 | |
johnc@1829 | 2670 | if (in_young_gc_mode()) { |
johnc@1829 | 2671 | _inc_cset_young_index = 0; |
johnc@1829 | 2672 | } |
johnc@1829 | 2673 | |
johnc@1829 | 2674 | _inc_cset_max_finger = 0; |
johnc@1829 | 2675 | _inc_cset_recorded_young_bytes = 0; |
johnc@1829 | 2676 | _inc_cset_recorded_rs_lengths = 0; |
johnc@1829 | 2677 | _inc_cset_predicted_elapsed_time_ms = 0; |
johnc@1829 | 2678 | _inc_cset_predicted_bytes_to_copy = 0; |
johnc@1829 | 2679 | _inc_cset_build_state = Active; |
johnc@1829 | 2680 | } |
johnc@1829 | 2681 | |
johnc@1829 | 2682 | void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
johnc@1829 | 2683 | // This routine is used when: |
johnc@1829 | 2684 | // * adding survivor regions to the incremental cset at the end of an |
johnc@1829 | 2685 | // evacuation pause, |
johnc@1829 | 2686 | // * adding the current allocation region to the incremental cset |
johnc@1829 | 2687 | // when it is retired, and |
johnc@1829 | 2688 | // * updating existing policy information for a region in the |
johnc@1829 | 2689 | // incremental cset via young list RSet sampling. |
johnc@1829 | 2690 | // Therefore this routine may be called at a safepoint by the |
johnc@1829 | 2691 | // VM thread, or in-between safepoints by mutator threads (when |
johnc@1829 | 2692 | // retiring the current allocation region) or a concurrent |
johnc@1829 | 2693 | // refine thread (RSet sampling). |
johnc@1829 | 2694 | |
johnc@1829 | 2695 | double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
johnc@1829 | 2696 | size_t used_bytes = hr->used(); |
johnc@1829 | 2697 | |
johnc@1829 | 2698 | _inc_cset_recorded_rs_lengths += rs_length; |
johnc@1829 | 2699 | _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
johnc@1829 | 2700 | |
johnc@1829 | 2701 | _inc_cset_bytes_used_before += used_bytes; |
johnc@1829 | 2702 | |
johnc@1829 | 2703 | // Cache the values we have added to the aggregated informtion |
johnc@1829 | 2704 | // in the heap region in case we have to remove this region from |
johnc@1829 | 2705 | // the incremental collection set, or it is updated by the |
johnc@1829 | 2706 | // rset sampling code |
johnc@1829 | 2707 | hr->set_recorded_rs_length(rs_length); |
johnc@1829 | 2708 | hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
johnc@1829 | 2709 | |
johnc@1829 | 2710 | #if PREDICTIONS_VERBOSE |
johnc@1829 | 2711 | size_t bytes_to_copy = predict_bytes_to_copy(hr); |
johnc@1829 | 2712 | _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
johnc@1829 | 2713 | |
johnc@1829 | 2714 | // Record the number of bytes used in this region |
johnc@1829 | 2715 | _inc_cset_recorded_young_bytes += used_bytes; |
johnc@1829 | 2716 | |
johnc@1829 | 2717 | // Cache the values we have added to the aggregated informtion |
johnc@1829 | 2718 | // in the heap region in case we have to remove this region from |
johnc@1829 | 2719 | // the incremental collection set, or it is updated by the |
johnc@1829 | 2720 | // rset sampling code |
johnc@1829 | 2721 | hr->set_predicted_bytes_to_copy(bytes_to_copy); |
johnc@1829 | 2722 | #endif // PREDICTIONS_VERBOSE |
johnc@1829 | 2723 | } |
johnc@1829 | 2724 | |
johnc@1829 | 2725 | void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
johnc@1829 | 2726 | // This routine is currently only called as part of the updating of |
johnc@1829 | 2727 | // existing policy information for regions in the incremental cset that |
johnc@1829 | 2728 | // is performed by the concurrent refine thread(s) as part of young list |
johnc@1829 | 2729 | // RSet sampling. Therefore we should not be at a safepoint. |
johnc@1829 | 2730 | |
johnc@1829 | 2731 | assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
johnc@1829 | 2732 | assert(hr->is_young(), "it should be"); |
johnc@1829 | 2733 | |
johnc@1829 | 2734 | size_t used_bytes = hr->used(); |
johnc@1829 | 2735 | size_t old_rs_length = hr->recorded_rs_length(); |
johnc@1829 | 2736 | double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
johnc@1829 | 2737 | |
johnc@1829 | 2738 | // Subtract the old recorded/predicted policy information for |
johnc@1829 | 2739 | // the given heap region from the collection set info. |
johnc@1829 | 2740 | _inc_cset_recorded_rs_lengths -= old_rs_length; |
johnc@1829 | 2741 | _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
johnc@1829 | 2742 | |
johnc@1829 | 2743 | _inc_cset_bytes_used_before -= used_bytes; |
johnc@1829 | 2744 | |
johnc@1829 | 2745 | // Clear the values cached in the heap region |
johnc@1829 | 2746 | hr->set_recorded_rs_length(0); |
johnc@1829 | 2747 | hr->set_predicted_elapsed_time_ms(0); |
johnc@1829 | 2748 | |
johnc@1829 | 2749 | #if PREDICTIONS_VERBOSE |
johnc@1829 | 2750 | size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
johnc@1829 | 2751 | _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
johnc@1829 | 2752 | |
johnc@1829 | 2753 | // Subtract the number of bytes used in this region |
johnc@1829 | 2754 | _inc_cset_recorded_young_bytes -= used_bytes; |
johnc@1829 | 2755 | |
johnc@1829 | 2756 | // Clear the values cached in the heap region |
johnc@1829 | 2757 | hr->set_predicted_bytes_to_copy(0); |
johnc@1829 | 2758 | #endif // PREDICTIONS_VERBOSE |
johnc@1829 | 2759 | } |
johnc@1829 | 2760 | |
johnc@1829 | 2761 | void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
johnc@1829 | 2762 | // Update the collection set information that is dependent on the new RS length |
johnc@1829 | 2763 | assert(hr->is_young(), "Precondition"); |
johnc@1829 | 2764 | |
johnc@1829 | 2765 | remove_from_incremental_cset_info(hr); |
johnc@1829 | 2766 | add_to_incremental_cset_info(hr, new_rs_length); |
johnc@1829 | 2767 | } |
johnc@1829 | 2768 | |
johnc@1829 | 2769 | void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
johnc@1829 | 2770 | assert( hr->is_young(), "invariant"); |
johnc@1829 | 2771 | assert( hr->young_index_in_cset() == -1, "invariant" ); |
johnc@1829 | 2772 | assert(_inc_cset_build_state == Active, "Precondition"); |
johnc@1829 | 2773 | |
johnc@1829 | 2774 | // We need to clear and set the cached recorded/cached collection set |
johnc@1829 | 2775 | // information in the heap region here (before the region gets added |
johnc@1829 | 2776 | // to the collection set). An individual heap region's cached values |
johnc@1829 | 2777 | // are calculated, aggregated with the policy collection set info, |
johnc@1829 | 2778 | // and cached in the heap region here (initially) and (subsequently) |
johnc@1829 | 2779 | // by the Young List sampling code. |
johnc@1829 | 2780 | |
johnc@1829 | 2781 | size_t rs_length = hr->rem_set()->occupied(); |
johnc@1829 | 2782 | add_to_incremental_cset_info(hr, rs_length); |
johnc@1829 | 2783 | |
johnc@1829 | 2784 | HeapWord* hr_end = hr->end(); |
johnc@1829 | 2785 | _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
johnc@1829 | 2786 | |
johnc@1829 | 2787 | assert(!hr->in_collection_set(), "invariant"); |
johnc@1829 | 2788 | hr->set_in_collection_set(true); |
johnc@1829 | 2789 | assert( hr->next_in_collection_set() == NULL, "invariant"); |
johnc@1829 | 2790 | |
johnc@1829 | 2791 | _inc_cset_size++; |
johnc@1829 | 2792 | _g1->register_region_with_in_cset_fast_test(hr); |
johnc@1829 | 2793 | |
johnc@1829 | 2794 | hr->set_young_index_in_cset((int) _inc_cset_young_index); |
johnc@1829 | 2795 | ++_inc_cset_young_index; |
johnc@1829 | 2796 | } |
johnc@1829 | 2797 | |
johnc@1829 | 2798 | // Add the region at the RHS of the incremental cset |
johnc@1829 | 2799 | void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
johnc@1829 | 2800 | // We should only ever be appending survivors at the end of a pause |
johnc@1829 | 2801 | assert( hr->is_survivor(), "Logic"); |
johnc@1829 | 2802 | |
johnc@1829 | 2803 | // Do the 'common' stuff |
johnc@1829 | 2804 | add_region_to_incremental_cset_common(hr); |
johnc@1829 | 2805 | |
johnc@1829 | 2806 | // Now add the region at the right hand side |
johnc@1829 | 2807 | if (_inc_cset_tail == NULL) { |
johnc@1829 | 2808 | assert(_inc_cset_head == NULL, "invariant"); |
johnc@1829 | 2809 | _inc_cset_head = hr; |
johnc@1829 | 2810 | } else { |
johnc@1829 | 2811 | _inc_cset_tail->set_next_in_collection_set(hr); |
johnc@1829 | 2812 | } |
johnc@1829 | 2813 | _inc_cset_tail = hr; |
johnc@1829 | 2814 | |
johnc@1829 | 2815 | if (G1PrintHeapRegions) { |
johnc@1829 | 2816 | gclog_or_tty->print_cr(" added region to incremental cset (RHS) " |
johnc@1829 | 2817 | "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
johnc@1829 | 2818 | "top "PTR_FORMAT", young %s", |
johnc@1829 | 2819 | hr->hrs_index(), hr->bottom(), hr->end(), |
johnc@1829 | 2820 | hr->top(), (hr->is_young()) ? "YES" : "NO"); |
johnc@1829 | 2821 | } |
johnc@1829 | 2822 | } |
johnc@1829 | 2823 | |
johnc@1829 | 2824 | // Add the region to the LHS of the incremental cset |
johnc@1829 | 2825 | void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
johnc@1829 | 2826 | // Survivors should be added to the RHS at the end of a pause |
johnc@1829 | 2827 | assert(!hr->is_survivor(), "Logic"); |
johnc@1829 | 2828 | |
johnc@1829 | 2829 | // Do the 'common' stuff |
johnc@1829 | 2830 | add_region_to_incremental_cset_common(hr); |
johnc@1829 | 2831 | |
johnc@1829 | 2832 | // Add the region at the left hand side |
johnc@1829 | 2833 | hr->set_next_in_collection_set(_inc_cset_head); |
johnc@1829 | 2834 | if (_inc_cset_head == NULL) { |
johnc@1829 | 2835 | assert(_inc_cset_tail == NULL, "Invariant"); |
johnc@1829 | 2836 | _inc_cset_tail = hr; |
johnc@1829 | 2837 | } |
johnc@1829 | 2838 | _inc_cset_head = hr; |
johnc@1829 | 2839 | |
johnc@1829 | 2840 | if (G1PrintHeapRegions) { |
johnc@1829 | 2841 | gclog_or_tty->print_cr(" added region to incremental cset (LHS) " |
johnc@1829 | 2842 | "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
johnc@1829 | 2843 | "top "PTR_FORMAT", young %s", |
johnc@1829 | 2844 | hr->hrs_index(), hr->bottom(), hr->end(), |
johnc@1829 | 2845 | hr->top(), (hr->is_young()) ? "YES" : "NO"); |
johnc@1829 | 2846 | } |
johnc@1829 | 2847 | } |
johnc@1829 | 2848 | |
johnc@1829 | 2849 | #ifndef PRODUCT |
johnc@1829 | 2850 | void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
johnc@1829 | 2851 | assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
johnc@1829 | 2852 | |
johnc@1829 | 2853 | st->print_cr("\nCollection_set:"); |
johnc@1829 | 2854 | HeapRegion* csr = list_head; |
johnc@1829 | 2855 | while (csr != NULL) { |
johnc@1829 | 2856 | HeapRegion* next = csr->next_in_collection_set(); |
johnc@1829 | 2857 | assert(csr->in_collection_set(), "bad CS"); |
johnc@1829 | 2858 | st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
johnc@1829 | 2859 | "age: %4d, y: %d, surv: %d", |
johnc@1829 | 2860 | csr->bottom(), csr->end(), |
johnc@1829 | 2861 | csr->top(), |
johnc@1829 | 2862 | csr->prev_top_at_mark_start(), |
johnc@1829 | 2863 | csr->next_top_at_mark_start(), |
johnc@1829 | 2864 | csr->top_at_conc_mark_count(), |
johnc@1829 | 2865 | csr->age_in_surv_rate_group_cond(), |
johnc@1829 | 2866 | csr->is_young(), |
johnc@1829 | 2867 | csr->is_survivor()); |
johnc@1829 | 2868 | csr = next; |
johnc@1829 | 2869 | } |
johnc@1829 | 2870 | } |
johnc@1829 | 2871 | #endif // !PRODUCT |
johnc@1829 | 2872 | |
johnc@1829 | 2873 | bool |
tonyp@2011 | 2874 | G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
tonyp@2011 | 2875 | double target_pause_time_ms) { |
johnc@1829 | 2876 | // Set this here - in case we're not doing young collections. |
johnc@1829 | 2877 | double non_young_start_time_sec = os::elapsedTime(); |
johnc@1829 | 2878 | |
johnc@1829 | 2879 | // The result that this routine will return. This will be set to |
johnc@1829 | 2880 | // false if: |
johnc@1829 | 2881 | // * we're doing a young or partially young collection and we |
johnc@1829 | 2882 | // have added the youg regions to collection set, or |
johnc@1829 | 2883 | // * we add old regions to the collection set. |
johnc@1829 | 2884 | bool abandon_collection = true; |
johnc@1829 | 2885 | |
ysr@777 | 2886 | start_recording_regions(); |
ysr@777 | 2887 | |
tonyp@2011 | 2888 | guarantee(target_pause_time_ms > 0.0, |
tonyp@2011 | 2889 | err_msg("target_pause_time_ms = %1.6lf should be positive", |
tonyp@2011 | 2890 | target_pause_time_ms)); |
tonyp@2011 | 2891 | guarantee(_collection_set == NULL, "Precondition"); |
ysr@777 | 2892 | |
ysr@777 | 2893 | double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); |
ysr@777 | 2894 | double predicted_pause_time_ms = base_time_ms; |
ysr@777 | 2895 | |
tonyp@2011 | 2896 | double time_remaining_ms = target_pause_time_ms - base_time_ms; |
ysr@777 | 2897 | |
ysr@777 | 2898 | // the 10% and 50% values are arbitrary... |
tonyp@2011 | 2899 | if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
tonyp@2011 | 2900 | time_remaining_ms = 0.50 * target_pause_time_ms; |
ysr@777 | 2901 | _within_target = false; |
ysr@777 | 2902 | } else { |
ysr@777 | 2903 | _within_target = true; |
ysr@777 | 2904 | } |
ysr@777 | 2905 | |
ysr@777 | 2906 | // We figure out the number of bytes available for future to-space. |
ysr@777 | 2907 | // For new regions without marking information, we must assume the |
ysr@777 | 2908 | // worst-case of complete survival. If we have marking information for a |
ysr@777 | 2909 | // region, we can bound the amount of live data. We can add a number of |
ysr@777 | 2910 | // such regions, as long as the sum of the live data bounds does not |
ysr@777 | 2911 | // exceed the available evacuation space. |
ysr@777 | 2912 | size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; |
ysr@777 | 2913 | |
ysr@777 | 2914 | size_t expansion_bytes = |
ysr@777 | 2915 | _g1->expansion_regions() * HeapRegion::GrainBytes; |
ysr@777 | 2916 | |
apetrusenko@1112 | 2917 | _collection_set_bytes_used_before = 0; |
apetrusenko@1112 | 2918 | _collection_set_size = 0; |
ysr@777 | 2919 | |
ysr@777 | 2920 | // Adjust for expansion and slop. |
ysr@777 | 2921 | max_live_bytes = max_live_bytes + expansion_bytes; |
ysr@777 | 2922 | |
apetrusenko@1112 | 2923 | assert(_g1->regions_accounted_for(), "Region leakage!"); |
ysr@777 | 2924 | |
ysr@777 | 2925 | HeapRegion* hr; |
ysr@777 | 2926 | if (in_young_gc_mode()) { |
ysr@777 | 2927 | double young_start_time_sec = os::elapsedTime(); |
ysr@777 | 2928 | |
ysr@777 | 2929 | if (G1PolicyVerbose > 0) { |
ysr@777 | 2930 | gclog_or_tty->print_cr("Adding %d young regions to the CSet", |
johnc@1829 | 2931 | _g1->young_list()->length()); |
ysr@777 | 2932 | } |
johnc@1829 | 2933 | |
ysr@777 | 2934 | _young_cset_length = 0; |
ysr@777 | 2935 | _last_young_gc_full = full_young_gcs() ? true : false; |
johnc@1829 | 2936 | |
ysr@777 | 2937 | if (_last_young_gc_full) |
ysr@777 | 2938 | ++_full_young_pause_num; |
ysr@777 | 2939 | else |
ysr@777 | 2940 | ++_partial_young_pause_num; |
johnc@1829 | 2941 | |
johnc@1829 | 2942 | // The young list is laid with the survivor regions from the previous |
johnc@1829 | 2943 | // pause are appended to the RHS of the young list, i.e. |
johnc@1829 | 2944 | // [Newly Young Regions ++ Survivors from last pause]. |
johnc@1829 | 2945 | |
johnc@1829 | 2946 | hr = _g1->young_list()->first_survivor_region(); |
ysr@777 | 2947 | while (hr != NULL) { |
johnc@1829 | 2948 | assert(hr->is_survivor(), "badly formed young list"); |
johnc@1829 | 2949 | hr->set_young(); |
johnc@1829 | 2950 | hr = hr->get_next_young_region(); |
ysr@777 | 2951 | } |
ysr@777 | 2952 | |
johnc@1829 | 2953 | // Clear the fields that point to the survivor list - they are |
johnc@1829 | 2954 | // all young now. |
johnc@1829 | 2955 | _g1->young_list()->clear_survivors(); |
johnc@1829 | 2956 | |
johnc@1829 | 2957 | if (_g1->mark_in_progress()) |
johnc@1829 | 2958 | _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
johnc@1829 | 2959 | |
johnc@1829 | 2960 | _young_cset_length = _inc_cset_young_index; |
johnc@1829 | 2961 | _collection_set = _inc_cset_head; |
johnc@1829 | 2962 | _collection_set_size = _inc_cset_size; |
johnc@1829 | 2963 | _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
johnc@1829 | 2964 | |
johnc@1829 | 2965 | // For young regions in the collection set, we assume the worst |
johnc@1829 | 2966 | // case of complete survival |
johnc@1829 | 2967 | max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
johnc@1829 | 2968 | |
johnc@1829 | 2969 | time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
johnc@1829 | 2970 | predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
johnc@1829 | 2971 | |
johnc@1829 | 2972 | // The number of recorded young regions is the incremental |
johnc@1829 | 2973 | // collection set's current size |
johnc@1829 | 2974 | set_recorded_young_regions(_inc_cset_size); |
johnc@1829 | 2975 | set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
johnc@1829 | 2976 | set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
johnc@1829 | 2977 | #if PREDICTIONS_VERBOSE |
johnc@1829 | 2978 | set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
johnc@1829 | 2979 | #endif // PREDICTIONS_VERBOSE |
johnc@1829 | 2980 | |
johnc@1829 | 2981 | if (G1PolicyVerbose > 0) { |
johnc@1829 | 2982 | gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
johnc@1829 | 2983 | _inc_cset_size); |
johnc@1829 | 2984 | gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
johnc@1829 | 2985 | max_live_bytes/K); |
johnc@1829 | 2986 | } |
johnc@1829 | 2987 | |
johnc@1829 | 2988 | assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
johnc@1829 | 2989 | if (_inc_cset_size > 0) { |
johnc@1829 | 2990 | assert(_collection_set != NULL, "Invariant"); |
johnc@1829 | 2991 | abandon_collection = false; |
johnc@1829 | 2992 | } |
ysr@777 | 2993 | |
ysr@777 | 2994 | double young_end_time_sec = os::elapsedTime(); |
ysr@777 | 2995 | _recorded_young_cset_choice_time_ms = |
ysr@777 | 2996 | (young_end_time_sec - young_start_time_sec) * 1000.0; |
ysr@777 | 2997 | |
johnc@1829 | 2998 | // We are doing young collections so reset this. |
johnc@1829 | 2999 | non_young_start_time_sec = young_end_time_sec; |
johnc@1829 | 3000 | |
johnc@1829 | 3001 | // Note we can use either _collection_set_size or |
johnc@1829 | 3002 | // _young_cset_length here |
johnc@1829 | 3003 | if (_collection_set_size > 0 && _last_young_gc_full) { |
ysr@777 | 3004 | // don't bother adding more regions... |
ysr@777 | 3005 | goto choose_collection_set_end; |
ysr@777 | 3006 | } |
ysr@777 | 3007 | } |
ysr@777 | 3008 | |
ysr@777 | 3009 | if (!in_young_gc_mode() || !full_young_gcs()) { |
ysr@777 | 3010 | bool should_continue = true; |
ysr@777 | 3011 | NumberSeq seq; |
ysr@777 | 3012 | double avg_prediction = 100000000000000000.0; // something very large |
johnc@1829 | 3013 | |
johnc@1829 | 3014 | // Save the current size of the collection set to detect |
johnc@1829 | 3015 | // if we actually added any old regions. |
johnc@1829 | 3016 | size_t n_young_regions = _collection_set_size; |
johnc@1829 | 3017 | |
ysr@777 | 3018 | do { |
ysr@777 | 3019 | hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, |
ysr@777 | 3020 | avg_prediction); |
apetrusenko@1112 | 3021 | if (hr != NULL) { |
ysr@777 | 3022 | double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
ysr@777 | 3023 | time_remaining_ms -= predicted_time_ms; |
ysr@777 | 3024 | predicted_pause_time_ms += predicted_time_ms; |
ysr@777 | 3025 | add_to_collection_set(hr); |
johnc@1829 | 3026 | record_non_young_cset_region(hr); |
ysr@777 | 3027 | max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
ysr@777 | 3028 | if (G1PolicyVerbose > 0) { |
ysr@777 | 3029 | gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
ysr@777 | 3030 | max_live_bytes/K); |
ysr@777 | 3031 | } |
ysr@777 | 3032 | seq.add(predicted_time_ms); |
ysr@777 | 3033 | avg_prediction = seq.avg() + seq.sd(); |
ysr@777 | 3034 | } |
ysr@777 | 3035 | should_continue = |
ysr@777 | 3036 | ( hr != NULL) && |
ysr@777 | 3037 | ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 |
ysr@777 | 3038 | : _collection_set_size < _young_list_fixed_length ); |
ysr@777 | 3039 | } while (should_continue); |
ysr@777 | 3040 | |
ysr@777 | 3041 | if (!adaptive_young_list_length() && |
ysr@777 | 3042 | _collection_set_size < _young_list_fixed_length) |
ysr@777 | 3043 | _should_revert_to_full_young_gcs = true; |
johnc@1829 | 3044 | |
johnc@1829 | 3045 | if (_collection_set_size > n_young_regions) { |
johnc@1829 | 3046 | // We actually added old regions to the collection set |
johnc@1829 | 3047 | // so we are not abandoning this collection. |
johnc@1829 | 3048 | abandon_collection = false; |
johnc@1829 | 3049 | } |
ysr@777 | 3050 | } |
ysr@777 | 3051 | |
ysr@777 | 3052 | choose_collection_set_end: |
johnc@1829 | 3053 | stop_incremental_cset_building(); |
johnc@1829 | 3054 | |
ysr@777 | 3055 | count_CS_bytes_used(); |
ysr@777 | 3056 | |
ysr@777 | 3057 | end_recording_regions(); |
ysr@777 | 3058 | |
ysr@777 | 3059 | double non_young_end_time_sec = os::elapsedTime(); |
ysr@777 | 3060 | _recorded_non_young_cset_choice_time_ms = |
ysr@777 | 3061 | (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; |
johnc@1829 | 3062 | |
tonyp@2011 | 3063 | // Here we are supposed to return whether the pause should be |
tonyp@2011 | 3064 | // abandoned or not (i.e., whether the collection set is empty or |
tonyp@2011 | 3065 | // not). However, this introduces a subtle issue when a pause is |
tonyp@2011 | 3066 | // initiated explicitly with System.gc() and |
tonyp@2011 | 3067 | // +ExplicitGCInvokesConcurrent (see Comment #2 in CR 6944166), it's |
tonyp@2011 | 3068 | // supposed to start a marking cycle, and it's abandoned. So, by |
tonyp@2011 | 3069 | // returning false here we are telling the caller never to consider |
tonyp@2011 | 3070 | // a pause to be abandoned. We'll actually remove all the code |
tonyp@2011 | 3071 | // associated with abandoned pauses as part of CR 6963209, but we are |
tonyp@2011 | 3072 | // just disabling them this way for the moment to avoid increasing |
tonyp@2011 | 3073 | // further the amount of changes for CR 6944166. |
tonyp@2011 | 3074 | return false; |
ysr@777 | 3075 | } |
ysr@777 | 3076 | |
ysr@777 | 3077 | void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { |
ysr@777 | 3078 | G1CollectorPolicy::record_full_collection_end(); |
ysr@777 | 3079 | _collectionSetChooser->updateAfterFullCollection(); |
ysr@777 | 3080 | } |
ysr@777 | 3081 | |
ysr@777 | 3082 | void G1CollectorPolicy_BestRegionsFirst:: |
ysr@777 | 3083 | expand_if_possible(size_t numRegions) { |
ysr@777 | 3084 | size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; |
ysr@777 | 3085 | _g1->expand(expansion_bytes); |
ysr@777 | 3086 | } |
ysr@777 | 3087 | |
ysr@777 | 3088 | void G1CollectorPolicy_BestRegionsFirst:: |
apetrusenko@1112 | 3089 | record_collection_pause_end(bool abandoned) { |
apetrusenko@1112 | 3090 | G1CollectorPolicy::record_collection_pause_end(abandoned); |
ysr@777 | 3091 | assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
ysr@777 | 3092 | } |