Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1972:f95d63e2154a
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
| author | stefank |
|---|---|
| date | Tue, 23 Nov 2010 13:22:55 -0800 |
| parents | 8b10f48633dc |
| children | 631f79e71e90 |
| rev | line source |
|---|---|
| 342 | 1 /* |
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2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 342 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #include "precompiled.hpp" |
| 26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
| 27 #include "gc_implementation/g1/concurrentMark.hpp" | |
| 28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
| 29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
| 30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
| 31 #include "gc_implementation/g1/heapRegionRemSet.hpp" | |
| 32 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
| 33 #include "runtime/arguments.hpp" | |
| 34 #include "runtime/java.hpp" | |
| 35 #include "runtime/mutexLocker.hpp" | |
| 36 #include "utilities/debug.hpp" | |
| 342 | 37 |
| 38 #define PREDICTIONS_VERBOSE 0 | |
| 39 | |
| 40 // <NEW PREDICTION> | |
| 41 | |
| 42 // Different defaults for different number of GC threads | |
| 43 // They were chosen by running GCOld and SPECjbb on debris with different | |
| 44 // numbers of GC threads and choosing them based on the results | |
| 45 | |
| 46 // all the same | |
| 47 static double rs_length_diff_defaults[] = { | |
| 48 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
| 49 }; | |
| 50 | |
| 51 static double cost_per_card_ms_defaults[] = { | |
| 52 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
| 53 }; | |
| 54 | |
| 55 // all the same | |
| 56 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
| 57 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
| 58 }; | |
| 59 | |
| 60 static double cost_per_entry_ms_defaults[] = { | |
| 61 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
| 62 }; | |
| 63 | |
| 64 static double cost_per_byte_ms_defaults[] = { | |
| 65 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
| 66 }; | |
| 67 | |
| 68 // these should be pretty consistent | |
| 69 static double constant_other_time_ms_defaults[] = { | |
| 70 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
| 71 }; | |
| 72 | |
| 73 | |
| 74 static double young_other_cost_per_region_ms_defaults[] = { | |
| 75 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
| 76 }; | |
| 77 | |
| 78 static double non_young_other_cost_per_region_ms_defaults[] = { | |
| 79 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
| 80 }; | |
| 81 | |
| 82 // </NEW PREDICTION> | |
| 83 | |
| 84 G1CollectorPolicy::G1CollectorPolicy() : | |
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85 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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86 ? ParallelGCThreads : 1), |
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87 |
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88 |
| 342 | 89 _n_pauses(0), |
| 90 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 91 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 92 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 93 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 94 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 95 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 96 _all_pause_times_ms(new NumberSeq()), | |
| 97 _stop_world_start(0.0), | |
| 98 _all_stop_world_times_ms(new NumberSeq()), | |
| 99 _all_yield_times_ms(new NumberSeq()), | |
| 100 | |
| 101 _all_mod_union_times_ms(new NumberSeq()), | |
| 102 | |
| 677 | 103 _summary(new Summary()), |
| 342 | 104 |
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105 #ifndef PRODUCT |
| 342 | 106 _cur_clear_ct_time_ms(0.0), |
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107 _min_clear_cc_time_ms(-1.0), |
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108 _max_clear_cc_time_ms(-1.0), |
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109 _cur_clear_cc_time_ms(0.0), |
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110 _cum_clear_cc_time_ms(0.0), |
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111 _num_cc_clears(0L), |
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112 #endif |
| 342 | 113 |
| 114 _region_num_young(0), | |
| 115 _region_num_tenured(0), | |
| 116 _prev_region_num_young(0), | |
| 117 _prev_region_num_tenured(0), | |
| 118 | |
| 119 _aux_num(10), | |
| 120 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 121 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 122 _cur_aux_times_ms(new double[_aux_num]), | |
| 123 _cur_aux_times_set(new bool[_aux_num]), | |
| 124 | |
| 125 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 126 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 127 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 128 | |
| 129 // <NEW PREDICTION> | |
| 130 | |
| 131 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 132 _prev_collection_pause_end_ms(0.0), | |
| 133 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 134 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 135 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 136 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 137 _partially_young_cards_per_entry_ratio_seq( | |
| 138 new TruncatedSeq(TruncatedSeqLength)), | |
| 139 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 140 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 141 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 142 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 143 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 144 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 145 _non_young_other_cost_per_region_ms_seq( | |
| 146 new TruncatedSeq(TruncatedSeqLength)), | |
| 147 | |
| 148 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 149 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 150 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 151 | |
| 751 | 152 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 153 |
| 154 // </NEW PREDICTION> | |
| 155 | |
| 156 _in_young_gc_mode(false), | |
| 157 _full_young_gcs(true), | |
| 158 _full_young_pause_num(0), | |
| 159 _partial_young_pause_num(0), | |
| 160 | |
| 161 _during_marking(false), | |
| 162 _in_marking_window(false), | |
| 163 _in_marking_window_im(false), | |
| 164 | |
| 165 _known_garbage_ratio(0.0), | |
| 166 _known_garbage_bytes(0), | |
| 167 | |
| 168 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 169 | |
| 170 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 171 | |
| 172 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 173 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 174 | |
| 175 _recent_avg_pause_time_ratio(0.0), | |
| 176 _num_markings(0), | |
| 177 _n_marks(0), | |
| 178 _n_pauses_at_mark_end(0), | |
| 179 | |
| 180 _all_full_gc_times_ms(new NumberSeq()), | |
| 181 | |
| 182 // G1PausesBtwnConcMark defaults to -1 | |
| 183 // so the hack is to do the cast QQQ FIXME | |
| 184 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 185 _n_marks_since_last_pause(0), | |
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186 _initiate_conc_mark_if_possible(false), |
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187 _during_initial_mark_pause(false), |
| 342 | 188 _should_revert_to_full_young_gcs(false), |
| 189 _last_full_young_gc(false), | |
| 190 | |
| 191 _prev_collection_pause_used_at_end_bytes(0), | |
| 192 | |
| 193 _collection_set(NULL), | |
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194 _collection_set_size(0), |
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195 _collection_set_bytes_used_before(0), |
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196 |
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197 // Incremental CSet attributes |
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198 _inc_cset_build_state(Inactive), |
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199 _inc_cset_head(NULL), |
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200 _inc_cset_tail(NULL), |
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201 _inc_cset_size(0), |
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202 _inc_cset_young_index(0), |
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203 _inc_cset_bytes_used_before(0), |
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204 _inc_cset_max_finger(NULL), |
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205 _inc_cset_recorded_young_bytes(0), |
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206 _inc_cset_recorded_rs_lengths(0), |
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207 _inc_cset_predicted_elapsed_time_ms(0.0), |
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208 _inc_cset_predicted_bytes_to_copy(0), |
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209 |
| 342 | 210 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 211 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 212 #endif // _MSC_VER | |
| 213 | |
| 214 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
| 215 G1YoungSurvRateNumRegionsSummary)), | |
| 216 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
| 545 | 217 G1YoungSurvRateNumRegionsSummary)), |
| 342 | 218 // add here any more surv rate groups |
| 545 | 219 _recorded_survivor_regions(0), |
| 220 _recorded_survivor_head(NULL), | |
| 221 _recorded_survivor_tail(NULL), | |
| 1356 | 222 _survivors_age_table(true), |
| 223 | |
| 224 _gc_overhead_perc(0.0) | |
| 545 | 225 |
| 342 | 226 { |
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227 // Set up the region size and associated fields. Given that the |
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228 // policy is created before the heap, we have to set this up here, |
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229 // so it's done as soon as possible. |
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230 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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231 HeapRegionRemSet::setup_remset_size(); |
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232 |
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233 // Verify PLAB sizes |
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234 const uint region_size = HeapRegion::GrainWords; |
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235 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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236 char buffer[128]; |
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237 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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238 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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239 vm_exit_during_initialization(buffer); |
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240 } |
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241 |
| 342 | 242 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
| 243 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 244 | |
| 1611 | 245 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
| 342 | 246 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
| 247 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 248 | |
| 249 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 250 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 251 | |
| 252 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 253 | |
| 254 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 255 | |
| 256 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 1611 | 257 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
| 258 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
| 342 | 259 |
| 260 // start conservatively | |
| 751 | 261 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 262 |
| 263 // <NEW PREDICTION> | |
| 264 | |
| 265 int index; | |
| 266 if (ParallelGCThreads == 0) | |
| 267 index = 0; | |
| 268 else if (ParallelGCThreads > 8) | |
| 269 index = 7; | |
| 270 else | |
| 271 index = ParallelGCThreads - 1; | |
| 272 | |
| 273 _pending_card_diff_seq->add(0.0); | |
| 274 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 275 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 276 _fully_young_cards_per_entry_ratio_seq->add( | |
| 277 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 278 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 279 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 280 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 281 _young_other_cost_per_region_ms_seq->add( | |
| 282 young_other_cost_per_region_ms_defaults[index]); | |
| 283 _non_young_other_cost_per_region_ms_seq->add( | |
| 284 non_young_other_cost_per_region_ms_defaults[index]); | |
| 285 | |
| 286 // </NEW PREDICTION> | |
| 287 | |
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288 // Below, we might need to calculate the pause time target based on |
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289 // the pause interval. When we do so we are going to give G1 maximum |
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290 // flexibility and allow it to do pauses when it needs to. So, we'll |
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291 // arrange that the pause interval to be pause time target + 1 to |
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292 // ensure that a) the pause time target is maximized with respect to |
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293 // the pause interval and b) we maintain the invariant that pause |
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294 // time target < pause interval. If the user does not want this |
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295 // maximum flexibility, they will have to set the pause interval |
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296 // explicitly. |
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297 |
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298 // First make sure that, if either parameter is set, its value is |
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299 // reasonable. |
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300 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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301 if (MaxGCPauseMillis < 1) { |
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302 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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303 "greater than 0"); |
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304 } |
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305 } |
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306 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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307 if (GCPauseIntervalMillis < 1) { |
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308 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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309 "greater than 0"); |
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310 } |
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311 } |
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312 |
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313 // Then, if the pause time target parameter was not set, set it to |
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314 // the default value. |
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315 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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316 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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317 // The default pause time target in G1 is 200ms |
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318 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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319 } else { |
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320 // We do not allow the pause interval to be set without the |
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321 // pause time target |
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322 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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323 "without setting MaxGCPauseMillis"); |
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324 } |
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325 } |
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326 |
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327 // Then, if the interval parameter was not set, set it according to |
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328 // the pause time target (this will also deal with the case when the |
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329 // pause time target is the default value). |
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330 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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331 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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332 } |
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333 |
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334 // Finally, make sure that the two parameters are consistent. |
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335 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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336 char buffer[256]; |
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337 jio_snprintf(buffer, 256, |
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338 "MaxGCPauseMillis (%u) should be less than " |
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339 "GCPauseIntervalMillis (%u)", |
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340 MaxGCPauseMillis, GCPauseIntervalMillis); |
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341 vm_exit_during_initialization(buffer); |
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342 } |
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343 |
| 751 | 344 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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345 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 342 | 346 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
| 751 | 347 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 348 |
| 349 // start conservatively (around 50ms is about right) | |
| 350 _concurrent_mark_init_times_ms->add(0.05); | |
| 351 _concurrent_mark_remark_times_ms->add(0.05); | |
| 352 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 353 _tenuring_threshold = MaxTenuringThreshold; | |
| 354 | |
| 1282 | 355 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
| 356 // fixed, then _max_survivor_regions will be calculated at | |
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357 // calculate_young_list_target_length during initialization |
| 1282 | 358 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 359 |
| 1356 | 360 assert(GCTimeRatio > 0, |
| 361 "we should have set it to a default value set_g1_gc_flags() " | |
| 362 "if a user set it to 0"); | |
| 363 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
| 364 | |
| 342 | 365 initialize_all(); |
| 366 } | |
| 367 | |
| 368 // Increment "i", mod "len" | |
| 369 static void inc_mod(int& i, int len) { | |
| 370 i++; if (i == len) i = 0; | |
| 371 } | |
| 372 | |
| 373 void G1CollectorPolicy::initialize_flags() { | |
| 374 set_min_alignment(HeapRegion::GrainBytes); | |
| 375 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
|
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376 if (SurvivorRatio < 1) { |
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377 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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378 } |
| 342 | 379 CollectorPolicy::initialize_flags(); |
| 380 } | |
| 381 | |
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382 // The easiest way to deal with the parsing of the NewSize / |
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383 // MaxNewSize / etc. parameteres is to re-use the code in the |
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384 // TwoGenerationCollectorPolicy class. This is similar to what |
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385 // ParallelScavenge does with its GenerationSizer class (see |
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386 // ParallelScavengeHeap::initialize()). We might change this in the |
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387 // future, but it's a good start. |
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388 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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389 size_t size_to_region_num(size_t byte_size) { |
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390 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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391 } |
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392 |
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393 public: |
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394 G1YoungGenSizer() { |
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395 initialize_flags(); |
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396 initialize_size_info(); |
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397 } |
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398 |
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399 size_t min_young_region_num() { |
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400 return size_to_region_num(_min_gen0_size); |
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401 } |
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402 size_t initial_young_region_num() { |
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403 return size_to_region_num(_initial_gen0_size); |
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404 } |
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405 size_t max_young_region_num() { |
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406 return size_to_region_num(_max_gen0_size); |
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407 } |
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408 }; |
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409 |
| 342 | 410 void G1CollectorPolicy::init() { |
| 411 // Set aside an initial future to_space. | |
| 412 _g1 = G1CollectedHeap::heap(); | |
| 413 | |
| 414 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 415 | |
| 545 | 416 initialize_gc_policy_counters(); |
| 417 | |
| 342 | 418 if (G1Gen) { |
| 419 _in_young_gc_mode = true; | |
| 420 | |
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421 G1YoungGenSizer sizer; |
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422 size_t initial_region_num = sizer.initial_young_region_num(); |
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423 |
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424 if (UseAdaptiveSizePolicy) { |
| 342 | 425 set_adaptive_young_list_length(true); |
| 426 _young_list_fixed_length = 0; | |
| 427 } else { | |
| 428 set_adaptive_young_list_length(false); | |
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429 _young_list_fixed_length = initial_region_num; |
| 342 | 430 } |
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431 _free_regions_at_end_of_collection = _g1->free_regions(); |
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432 calculate_young_list_min_length(); |
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433 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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434 calculate_young_list_target_length(); |
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435 } else { |
| 342 | 436 _young_list_fixed_length = 0; |
| 437 _in_young_gc_mode = false; | |
| 438 } | |
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439 |
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440 // We may immediately start allocating regions and placing them on the |
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441 // collection set list. Initialize the per-collection set info |
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442 start_incremental_cset_building(); |
| 342 | 443 } |
| 444 | |
| 545 | 445 // Create the jstat counters for the policy. |
| 446 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 447 { | |
| 448 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
| 449 } | |
| 450 | |
| 342 | 451 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 452 _young_list_min_length = 0; | |
| 453 | |
| 454 if (!adaptive_young_list_length()) | |
| 455 return; | |
| 456 | |
| 457 if (_alloc_rate_ms_seq->num() > 3) { | |
| 458 double now_sec = os::elapsedTime(); | |
| 459 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 460 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 461 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
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462 int current_region_num = (int) _g1->young_list()->length(); |
| 342 | 463 _young_list_min_length = min_regions + current_region_num; |
| 464 } | |
| 465 } | |
| 466 | |
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467 void G1CollectorPolicy::calculate_young_list_target_length() { |
| 342 | 468 if (adaptive_young_list_length()) { |
| 469 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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470 calculate_young_list_target_length(rs_lengths); |
| 342 | 471 } else { |
| 472 if (full_young_gcs()) | |
| 473 _young_list_target_length = _young_list_fixed_length; | |
| 474 else | |
| 475 _young_list_target_length = _young_list_fixed_length / 2; | |
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476 |
| 342 | 477 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
| 478 } | |
| 545 | 479 calculate_survivors_policy(); |
| 342 | 480 } |
| 481 | |
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482 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
| 342 | 483 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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484 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
| 342 | 485 |
| 486 double start_time_sec = os::elapsedTime(); | |
| 1282 | 487 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
| 342 | 488 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 489 size_t reserve_regions = | |
| 490 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 491 | |
| 492 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 493 // we are in fully-young mode and there are free regions in the heap | |
| 494 | |
| 545 | 495 double survivor_regions_evac_time = |
| 496 predict_survivor_regions_evac_time(); | |
| 497 | |
| 342 | 498 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
| 499 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 500 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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501 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
| 545 | 502 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 503 + survivor_regions_evac_time; | |
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504 |
| 342 | 505 // the result |
| 506 size_t final_young_length = 0; | |
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507 |
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508 size_t init_free_regions = |
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509 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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510 |
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511 // if we're still under the pause target... |
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512 if (base_time_ms <= target_pause_time_ms) { |
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513 // We make sure that the shortest young length that makes sense |
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514 // fits within the target pause time. |
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515 size_t min_young_length = 1; |
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516 |
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517 if (predict_will_fit(min_young_length, base_time_ms, |
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518 init_free_regions, target_pause_time_ms)) { |
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519 // The shortest young length will fit within the target pause time; |
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520 // we'll now check whether the absolute maximum number of young |
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521 // regions will fit in the target pause time. If not, we'll do |
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522 // a binary search between min_young_length and max_young_length |
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523 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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524 size_t max_young_length = abs_max_young_length; |
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525 |
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526 if (max_young_length > min_young_length) { |
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527 // Let's check if the initial max young length will fit within the |
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528 // target pause. If so then there is no need to search for a maximal |
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529 // young length - we'll return the initial maximum |
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530 |
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531 if (predict_will_fit(max_young_length, base_time_ms, |
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532 init_free_regions, target_pause_time_ms)) { |
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533 // The maximum young length will satisfy the target pause time. |
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534 // We are done so set min young length to this maximum length. |
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535 // The code after the loop will then set final_young_length using |
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536 // the value cached in the minimum length. |
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537 min_young_length = max_young_length; |
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538 } else { |
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539 // The maximum possible number of young regions will not fit within |
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540 // the target pause time so let's search.... |
| 342 | 541 |
| 542 size_t diff = (max_young_length - min_young_length) / 2; | |
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543 max_young_length = min_young_length + diff; |
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544 |
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545 while (max_young_length > min_young_length) { |
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546 if (predict_will_fit(max_young_length, base_time_ms, |
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547 init_free_regions, target_pause_time_ms)) { |
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548 |
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549 // The current max young length will fit within the target |
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550 // pause time. Note we do not exit the loop here. By setting |
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551 // min = max, and then increasing the max below means that |
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552 // we will continue searching for an upper bound in the |
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553 // range [max..max+diff] |
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554 min_young_length = max_young_length; |
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555 } |
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556 diff = (max_young_length - min_young_length) / 2; |
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557 max_young_length = min_young_length + diff; |
| 342 | 558 } |
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559 // the above loop found a maximal young length that will fit |
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560 // within the target pause time. |
| 342 | 561 } |
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562 assert(min_young_length <= abs_max_young_length, "just checking"); |
| 342 | 563 } |
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564 final_young_length = min_young_length; |
| 342 | 565 } |
| 566 } | |
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567 // and we're done! |
| 342 | 568 |
| 569 // we should have at least one region in the target young length | |
| 545 | 570 _young_list_target_length = |
| 571 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
| 342 | 572 |
| 573 // let's keep an eye of how long we spend on this calculation | |
| 574 // right now, I assume that we'll print it when we need it; we | |
| 575 // should really adde it to the breakdown of a pause | |
| 576 double end_time_sec = os::elapsedTime(); | |
| 577 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 578 | |
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579 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 580 // leave this in for debugging, just in case |
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581 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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582 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
| 342 | 583 target_pause_time_ms, |
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584 _young_list_target_length |
| 342 | 585 elapsed_time_ms, |
| 586 full_young_gcs() ? "full" : "partial", | |
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587 during_initial_mark_pause() ? " i-m" : "", |
| 545 | 588 _in_marking_window, |
| 589 _in_marking_window_im); | |
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590 #endif // TRACE_CALC_YOUNG_LENGTH |
| 342 | 591 |
| 592 if (_young_list_target_length < _young_list_min_length) { | |
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593 // bummer; this means that, if we do a pause when the maximal |
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594 // length dictates, we'll violate the pause spacing target (the |
| 342 | 595 // min length was calculate based on the application's current |
| 596 // alloc rate); | |
| 597 | |
| 598 // so, we have to bite the bullet, and allocate the minimum | |
| 599 // number. We'll violate our target, but we just can't meet it. | |
| 600 | |
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601 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 602 // leave this in for debugging, just in case |
| 603 gclog_or_tty->print_cr("adjusted target length from " | |
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604 SIZE_FORMAT " to " SIZE_FORMAT, |
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605 _young_list_target_length, _young_list_min_length); |
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606 #endif // TRACE_CALC_YOUNG_LENGTH |
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607 |
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608 _young_list_target_length = _young_list_min_length; |
| 342 | 609 } |
| 610 } else { | |
| 611 // we are in a partially-young mode or we've run out of regions (due | |
| 612 // to evacuation failure) | |
| 613 | |
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614 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 615 // leave this in for debugging, just in case |
| 616 gclog_or_tty->print_cr("(partial) setting target to " SIZE_FORMAT | |
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617 _young_list_min_length); |
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618 #endif // TRACE_CALC_YOUNG_LENGTH |
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619 // we'll do the pause as soon as possible by choosing the minimum |
| 342 | 620 _young_list_target_length = |
| 621 MAX2(_young_list_min_length, (size_t) 1); | |
| 622 } | |
| 623 | |
| 624 _rs_lengths_prediction = rs_lengths; | |
| 625 } | |
| 626 | |
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627 // This is used by: calculate_young_list_target_length(rs_length). It |
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628 // returns true iff: |
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629 // the predicted pause time for the given young list will not overflow |
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630 // the target pause time |
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631 // and: |
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632 // the predicted amount of surviving data will not overflow the |
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633 // the amount of free space available for survivor regions. |
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634 // |
| 342 | 635 bool |
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636 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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637 double base_time_ms, |
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638 size_t init_free_regions, |
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639 double target_pause_time_ms) { |
| 342 | 640 |
| 641 if (young_length >= init_free_regions) | |
| 642 // end condition 1: not enough space for the young regions | |
| 643 return false; | |
| 644 | |
| 645 double accum_surv_rate_adj = 0.0; | |
| 646 double accum_surv_rate = | |
| 647 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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648 |
| 342 | 649 size_t bytes_to_copy = |
| 650 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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651 |
| 342 | 652 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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653 |
| 342 | 654 double young_other_time_ms = |
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655 predict_young_other_time_ms(young_length); |
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656 |
| 342 | 657 double pause_time_ms = |
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658 base_time_ms + copy_time_ms + young_other_time_ms; |
| 342 | 659 |
| 660 if (pause_time_ms > target_pause_time_ms) | |
| 661 // end condition 2: over the target pause time | |
| 662 return false; | |
| 663 | |
| 664 size_t free_bytes = | |
| 665 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 666 | |
| 667 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 668 // end condition 3: out of to-space (conservatively) | |
| 669 return false; | |
| 670 | |
| 671 // success! | |
| 672 return true; | |
| 673 } | |
| 674 | |
| 545 | 675 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 676 double survivor_regions_evac_time = 0.0; | |
| 677 for (HeapRegion * r = _recorded_survivor_head; | |
| 678 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 679 r = r->get_next_young_region()) { | |
| 680 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 681 } | |
| 682 return survivor_regions_evac_time; | |
| 683 } | |
| 684 | |
| 342 | 685 void G1CollectorPolicy::check_prediction_validity() { |
| 686 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 687 | |
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688 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
| 342 | 689 if (rs_lengths > _rs_lengths_prediction) { |
| 690 // add 10% to avoid having to recalculate often | |
| 691 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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692 calculate_young_list_target_length(rs_lengths_prediction); |
| 342 | 693 } |
| 694 } | |
| 695 | |
| 696 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 697 bool is_tlab, | |
| 698 bool* gc_overhead_limit_was_exceeded) { | |
| 699 guarantee(false, "Not using this policy feature yet."); | |
| 700 return NULL; | |
| 701 } | |
| 702 | |
| 703 // This method controls how a collector handles one or more | |
| 704 // of its generations being fully allocated. | |
| 705 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 706 bool is_tlab) { | |
| 707 guarantee(false, "Not using this policy feature yet."); | |
| 708 return NULL; | |
| 709 } | |
| 710 | |
| 711 | |
| 712 #ifndef PRODUCT | |
| 713 bool G1CollectorPolicy::verify_young_ages() { | |
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714 HeapRegion* head = _g1->young_list()->first_region(); |
| 342 | 715 return |
| 716 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 717 // also call verify_young_ages on any additional surv rate groups | |
| 718 } | |
| 719 | |
| 720 bool | |
| 721 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 722 SurvRateGroup *surv_rate_group) { | |
| 723 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 724 | |
| 725 const char* name = surv_rate_group->name(); | |
| 726 bool ret = true; | |
| 727 int prev_age = -1; | |
| 728 | |
| 729 for (HeapRegion* curr = head; | |
| 730 curr != NULL; | |
| 731 curr = curr->get_next_young_region()) { | |
| 732 SurvRateGroup* group = curr->surv_rate_group(); | |
| 733 if (group == NULL && !curr->is_survivor()) { | |
| 734 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 735 ret = false; | |
| 736 } | |
| 737 | |
| 738 if (surv_rate_group == group) { | |
| 739 int age = curr->age_in_surv_rate_group(); | |
| 740 | |
| 741 if (age < 0) { | |
| 742 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 743 ret = false; | |
| 744 } | |
| 745 | |
| 746 if (age <= prev_age) { | |
| 747 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 748 "(%d, %d)", name, age, prev_age); | |
| 749 ret = false; | |
| 750 } | |
| 751 prev_age = age; | |
| 752 } | |
| 753 } | |
| 754 | |
| 755 return ret; | |
| 756 } | |
| 757 #endif // PRODUCT | |
| 758 | |
| 759 void G1CollectorPolicy::record_full_collection_start() { | |
| 760 _cur_collection_start_sec = os::elapsedTime(); | |
| 761 // Release the future to-space so that it is available for compaction into. | |
| 762 _g1->set_full_collection(); | |
| 763 } | |
| 764 | |
| 765 void G1CollectorPolicy::record_full_collection_end() { | |
| 766 // Consider this like a collection pause for the purposes of allocation | |
| 767 // since last pause. | |
| 768 double end_sec = os::elapsedTime(); | |
| 769 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 770 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 771 | |
| 772 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 773 | |
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774 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 775 |
| 776 _g1->clear_full_collection(); | |
| 777 | |
| 778 // "Nuke" the heuristics that control the fully/partially young GC | |
| 779 // transitions and make sure we start with fully young GCs after the | |
| 780 // Full GC. | |
| 781 set_full_young_gcs(true); | |
| 782 _last_full_young_gc = false; | |
| 783 _should_revert_to_full_young_gcs = false; | |
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784 clear_initiate_conc_mark_if_possible(); |
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785 clear_during_initial_mark_pause(); |
| 342 | 786 _known_garbage_bytes = 0; |
| 787 _known_garbage_ratio = 0.0; | |
| 788 _in_marking_window = false; | |
| 789 _in_marking_window_im = false; | |
| 790 | |
| 791 _short_lived_surv_rate_group->start_adding_regions(); | |
| 792 // also call this on any additional surv rate groups | |
| 793 | |
| 545 | 794 record_survivor_regions(0, NULL, NULL); |
| 795 | |
| 342 | 796 _prev_region_num_young = _region_num_young; |
| 797 _prev_region_num_tenured = _region_num_tenured; | |
| 798 | |
| 799 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 545 | 800 // Reset survivors SurvRateGroup. |
| 801 _survivor_surv_rate_group->reset(); | |
| 342 | 802 calculate_young_list_min_length(); |
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803 calculate_young_list_target_length(); |
| 342 | 804 } |
| 805 | |
| 806 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
| 807 _bytes_in_to_space_before_gc += bytes; | |
| 808 } | |
| 809 | |
| 810 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
| 811 _bytes_in_to_space_after_gc += bytes; | |
| 812 } | |
| 813 | |
| 814 void G1CollectorPolicy::record_stop_world_start() { | |
| 815 _stop_world_start = os::elapsedTime(); | |
| 816 } | |
| 817 | |
| 818 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 819 size_t start_used) { | |
| 820 if (PrintGCDetails) { | |
| 821 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 822 gclog_or_tty->print("[GC pause"); | |
| 823 if (in_young_gc_mode()) | |
| 824 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
| 825 } | |
| 826 | |
| 827 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
| 828 "sanity"); | |
| 636 | 829 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
| 342 | 830 |
| 831 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 832 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 833 _stop_world_start = 0.0; | |
| 834 | |
| 835 _cur_collection_start_sec = start_time_sec; | |
| 836 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 837 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 838 _pending_cards = _g1->pending_card_num(); | |
| 839 _max_pending_cards = _g1->max_pending_card_num(); | |
| 840 | |
| 841 _bytes_in_to_space_before_gc = 0; | |
| 842 _bytes_in_to_space_after_gc = 0; | |
| 843 _bytes_in_collection_set_before_gc = 0; | |
| 844 | |
| 845 #ifdef DEBUG | |
| 846 // initialise these to something well known so that we can spot | |
| 847 // if they are not set properly | |
| 848 | |
| 849 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1611 | 850 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
| 851 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
| 852 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
| 853 _par_last_update_rs_times_ms[i] = -1234.0; | |
| 854 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
| 855 _par_last_scan_rs_times_ms[i] = -1234.0; | |
| 856 _par_last_obj_copy_times_ms[i] = -1234.0; | |
| 857 _par_last_termination_times_ms[i] = -1234.0; | |
| 858 _par_last_termination_attempts[i] = -1234.0; | |
| 859 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
| 342 | 860 } |
| 861 #endif | |
| 862 | |
| 863 for (int i = 0; i < _aux_num; ++i) { | |
| 864 _cur_aux_times_ms[i] = 0.0; | |
| 865 _cur_aux_times_set[i] = false; | |
| 866 } | |
| 867 | |
| 868 _satb_drain_time_set = false; | |
| 869 _last_satb_drain_processed_buffers = -1; | |
| 870 | |
| 871 if (in_young_gc_mode()) | |
| 872 _last_young_gc_full = false; | |
| 873 | |
| 874 // do that for any other surv rate groups | |
| 875 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1282 | 876 _survivors_age_table.clear(); |
| 545 | 877 |
| 342 | 878 assert( verify_young_ages(), "region age verification" ); |
| 879 } | |
| 880 | |
| 881 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 882 _mark_closure_time_ms = mark_closure_time_ms; | |
| 883 } | |
| 884 | |
| 885 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
| 886 _mark_init_start_sec = os::elapsedTime(); | |
| 887 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
| 888 } | |
| 889 | |
| 890 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
| 891 mark_init_elapsed_time_ms) { | |
| 892 _during_marking = true; | |
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893 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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894 clear_during_initial_mark_pause(); |
| 342 | 895 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
| 896 } | |
| 897 | |
| 898 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
| 899 double end_time_sec = os::elapsedTime(); | |
| 900 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
| 901 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
| 902 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
| 903 | |
| 904 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
| 905 } | |
| 906 | |
| 907 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 908 _mark_remark_start_sec = os::elapsedTime(); | |
| 909 _during_marking = false; | |
| 910 } | |
| 911 | |
| 912 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 913 double end_time_sec = os::elapsedTime(); | |
| 914 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 915 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 916 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 917 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 918 | |
| 919 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 920 } | |
| 921 | |
| 922 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 923 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 924 } | |
| 925 | |
| 926 void | |
| 927 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 928 size_t max_live_bytes) { | |
| 929 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 930 record_concurrent_mark_cleanup_end_work2(); | |
| 931 } | |
| 932 | |
| 933 void | |
| 934 G1CollectorPolicy:: | |
| 935 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 936 size_t max_live_bytes) { | |
| 937 if (_n_marks < 2) _n_marks++; | |
| 938 if (G1PolicyVerbose > 0) | |
| 939 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
| 940 " (of " SIZE_FORMAT " MB heap).", | |
| 941 max_live_bytes/M, _g1->capacity()/M); | |
| 942 } | |
| 943 | |
| 944 // The important thing about this is that it includes "os::elapsedTime". | |
| 945 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 946 double end_time_sec = os::elapsedTime(); | |
| 947 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 948 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 949 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 950 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 951 | |
| 952 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 953 | |
| 954 _num_markings++; | |
| 955 | |
| 956 // We did a marking, so reset the "since_last_mark" variables. | |
| 957 double considerConcMarkCost = 1.0; | |
| 958 // If there are available processors, concurrent activity is free... | |
| 959 if (Threads::number_of_non_daemon_threads() * 2 < | |
| 960 os::active_processor_count()) { | |
| 961 considerConcMarkCost = 0.0; | |
| 962 } | |
| 963 _n_pauses_at_mark_end = _n_pauses; | |
| 964 _n_marks_since_last_pause++; | |
| 965 } | |
| 966 | |
| 967 void | |
| 968 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
| 969 if (in_young_gc_mode()) { | |
| 970 _should_revert_to_full_young_gcs = false; | |
| 971 _last_full_young_gc = true; | |
| 972 _in_marking_window = false; | |
| 973 if (adaptive_young_list_length()) | |
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974 calculate_young_list_target_length(); |
| 342 | 975 } |
| 976 } | |
| 977 | |
| 978 void G1CollectorPolicy::record_concurrent_pause() { | |
| 979 if (_stop_world_start > 0.0) { | |
| 980 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 981 _all_yield_times_ms->add(yield_ms); | |
| 982 } | |
| 983 } | |
| 984 | |
| 985 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 986 } | |
| 987 | |
| 988 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
| 989 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
| 990 _cur_CH_strong_roots_dur_ms = | |
| 991 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
| 992 } | |
| 993 | |
| 994 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
| 995 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
| 996 _cur_G1_strong_roots_dur_ms = | |
| 997 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
| 998 } | |
| 999 | |
| 1000 template<class T> | |
| 1001 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 1002 T sum = (T)0; | |
| 1003 for (int i = 0; i < n; i++) { | |
| 1004 int j = (start + i) % N; | |
| 1005 sum += sum_arr[j]; | |
| 1006 } | |
| 1007 return sum; | |
| 1008 } | |
| 1009 | |
| 1611 | 1010 void G1CollectorPolicy::print_par_stats(int level, |
| 1011 const char* str, | |
| 1012 double* data, | |
| 342 | 1013 bool summary) { |
| 1014 double min = data[0], max = data[0]; | |
| 1015 double total = 0.0; | |
| 1016 int j; | |
| 1017 for (j = 0; j < level; ++j) | |
| 1018 gclog_or_tty->print(" "); | |
| 1019 gclog_or_tty->print("[%s (ms):", str); | |
| 1020 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1021 double val = data[i]; | |
| 1022 if (val < min) | |
| 1023 min = val; | |
| 1024 if (val > max) | |
| 1025 max = val; | |
| 1026 total += val; | |
| 1027 gclog_or_tty->print(" %3.1lf", val); | |
| 1028 } | |
| 1029 if (summary) { | |
| 1030 gclog_or_tty->print_cr(""); | |
| 1031 double avg = total / (double) ParallelGCThreads; | |
| 1032 gclog_or_tty->print(" "); | |
| 1033 for (j = 0; j < level; ++j) | |
| 1034 gclog_or_tty->print(" "); | |
| 1035 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
| 1036 avg, min, max); | |
| 1037 } | |
| 1038 gclog_or_tty->print_cr("]"); | |
| 1039 } | |
| 1040 | |
| 1611 | 1041 void G1CollectorPolicy::print_par_sizes(int level, |
| 1042 const char* str, | |
| 1043 double* data, | |
| 1044 bool summary) { | |
| 342 | 1045 double min = data[0], max = data[0]; |
| 1046 double total = 0.0; | |
| 1047 int j; | |
| 1048 for (j = 0; j < level; ++j) | |
| 1049 gclog_or_tty->print(" "); | |
| 1050 gclog_or_tty->print("[%s :", str); | |
| 1051 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1052 double val = data[i]; | |
| 1053 if (val < min) | |
| 1054 min = val; | |
| 1055 if (val > max) | |
| 1056 max = val; | |
| 1057 total += val; | |
| 1058 gclog_or_tty->print(" %d", (int) val); | |
| 1059 } | |
| 1060 if (summary) { | |
| 1061 gclog_or_tty->print_cr(""); | |
| 1062 double avg = total / (double) ParallelGCThreads; | |
| 1063 gclog_or_tty->print(" "); | |
| 1064 for (j = 0; j < level; ++j) | |
| 1065 gclog_or_tty->print(" "); | |
| 1066 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
| 1067 (int)total, (int)avg, (int)min, (int)max); | |
| 1068 } | |
| 1069 gclog_or_tty->print_cr("]"); | |
| 1070 } | |
| 1071 | |
| 1072 void G1CollectorPolicy::print_stats (int level, | |
| 1073 const char* str, | |
| 1074 double value) { | |
| 1075 for (int j = 0; j < level; ++j) | |
| 1076 gclog_or_tty->print(" "); | |
| 1077 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
| 1078 } | |
| 1079 | |
| 1080 void G1CollectorPolicy::print_stats (int level, | |
| 1081 const char* str, | |
| 1082 int value) { | |
| 1083 for (int j = 0; j < level; ++j) | |
| 1084 gclog_or_tty->print(" "); | |
| 1085 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
| 1086 } | |
| 1087 | |
| 1088 double G1CollectorPolicy::avg_value (double* data) { | |
|
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1089 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1090 double ret = 0.0; |
| 1091 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1092 ret += data[i]; | |
| 1093 return ret / (double) ParallelGCThreads; | |
| 1094 } else { | |
| 1095 return data[0]; | |
| 1096 } | |
| 1097 } | |
| 1098 | |
| 1099 double G1CollectorPolicy::max_value (double* data) { | |
|
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1100 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1101 double ret = data[0]; |
| 1102 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1103 if (data[i] > ret) | |
| 1104 ret = data[i]; | |
| 1105 return ret; | |
| 1106 } else { | |
| 1107 return data[0]; | |
| 1108 } | |
| 1109 } | |
| 1110 | |
| 1111 double G1CollectorPolicy::sum_of_values (double* data) { | |
|
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1112 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1113 double sum = 0.0; |
| 1114 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1115 sum += data[i]; | |
| 1116 return sum; | |
| 1117 } else { | |
| 1118 return data[0]; | |
| 1119 } | |
| 1120 } | |
| 1121 | |
| 1122 double G1CollectorPolicy::max_sum (double* data1, | |
| 1123 double* data2) { | |
| 1124 double ret = data1[0] + data2[0]; | |
| 1125 | |
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1126 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 1127 for (uint i = 1; i < ParallelGCThreads; ++i) { |
| 1128 double data = data1[i] + data2[i]; | |
| 1129 if (data > ret) | |
| 1130 ret = data; | |
| 1131 } | |
| 1132 } | |
| 1133 return ret; | |
| 1134 } | |
| 1135 | |
| 1136 // Anything below that is considered to be zero | |
| 1137 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1138 | |
| 1707 | 1139 void G1CollectorPolicy::record_collection_pause_end() { |
| 342 | 1140 double end_time_sec = os::elapsedTime(); |
| 1141 double elapsed_ms = _last_pause_time_ms; | |
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1142 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 1143 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; |
| 1144 size_t rs_size = | |
| 1145 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1146 size_t cur_used_bytes = _g1->used(); | |
| 1147 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1148 bool last_pause_included_initial_mark = false; | |
| 1707 | 1149 bool update_stats = !_g1->evacuation_failed(); |
| 342 | 1150 |
| 1151 #ifndef PRODUCT | |
| 1152 if (G1YoungSurvRateVerbose) { | |
| 1153 gclog_or_tty->print_cr(""); | |
| 1154 _short_lived_surv_rate_group->print(); | |
| 1155 // do that for any other surv rate groups too | |
| 1156 } | |
| 1157 #endif // PRODUCT | |
| 1158 | |
| 1159 if (in_young_gc_mode()) { | |
|
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1160 last_pause_included_initial_mark = during_initial_mark_pause(); |
| 342 | 1161 if (last_pause_included_initial_mark) |
| 1162 record_concurrent_mark_init_end_pre(0.0); | |
| 1163 | |
| 1164 size_t min_used_targ = | |
|
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1165 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
| 342 | 1166 |
|
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1167 |
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1168 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1169 assert(!last_pause_included_initial_mark, "invariant"); |
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1170 if (cur_used_bytes > min_used_targ && |
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1171 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1172 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1173 |
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1174 // Note: this might have already been set, if during the last |
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1175 // pause we decided to start a cycle but at the beginning of |
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1176 // this pause we decided to postpone it. That's OK. |
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1177 set_initiate_conc_mark_if_possible(); |
| 342 | 1178 } |
| 1179 } | |
| 1180 | |
| 1181 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
| 1182 } | |
| 1183 | |
| 1184 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
| 1185 end_time_sec, false); | |
| 1186 | |
| 1187 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1188 collection_set_size(), | |
| 1189 "Negative RS size?"); | |
| 1190 | |
| 1191 // This assert is exempted when we're doing parallel collection pauses, | |
| 1192 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1193 // can lead to more memory being used during collection than was used | |
| 1194 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1195 // Pauses in which evacuation failed can also lead to negative | |
| 1196 // collections, since no space is reclaimed from a region containing an | |
| 1197 // object whose evacuation failed. | |
| 1198 // Further, we're now always doing parallel collection. But I'm still | |
| 1199 // leaving this here as a placeholder for a more precise assertion later. | |
| 1200 // (DLD, 10/05.) | |
| 1201 assert((true || parallel) // Always using GC LABs now. | |
| 1202 || _g1->evacuation_failed() | |
| 1203 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1204 "Negative collection"); | |
| 1205 | |
| 1206 size_t freed_bytes = | |
| 1207 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1208 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
|
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1209 |
| 342 | 1210 double survival_fraction = |
| 1211 (double)surviving_bytes/ | |
| 1212 (double)_collection_set_bytes_used_before; | |
| 1213 | |
| 1214 _n_pauses++; | |
| 1215 | |
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1216 if (update_stats) { |
| 342 | 1217 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
| 1218 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
| 1219 _recent_evac_times_ms->add(evac_ms); | |
| 1220 _recent_pause_times_ms->add(elapsed_ms); | |
| 1221 | |
| 1222 _recent_rs_sizes->add(rs_size); | |
| 1223 | |
| 1224 // We exempt parallel collection from this check because Alloc Buffer | |
| 1225 // fragmentation can produce negative collections. Same with evac | |
| 1226 // failure. | |
| 1227 // Further, we're now always doing parallel collection. But I'm still | |
| 1228 // leaving this here as a placeholder for a more precise assertion later. | |
| 1229 // (DLD, 10/05. | |
| 1230 assert((true || parallel) | |
| 1231 || _g1->evacuation_failed() | |
| 1232 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1233 "Or else negative collection!"); | |
| 1234 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1235 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1236 | |
| 1237 // this is where we update the allocation rate of the application | |
| 1238 double app_time_ms = | |
| 1239 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1240 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1241 // This usually happens due to the timer not having the required | |
| 1242 // granularity. Some Linuxes are the usual culprits. | |
| 1243 // We'll just set it to something (arbitrarily) small. | |
| 1244 app_time_ms = 1.0; | |
| 1245 } | |
| 1246 size_t regions_allocated = | |
| 1247 (_region_num_young - _prev_region_num_young) + | |
| 1248 (_region_num_tenured - _prev_region_num_tenured); | |
| 1249 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1250 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1251 _prev_region_num_young = _region_num_young; | |
| 1252 _prev_region_num_tenured = _region_num_tenured; | |
| 1253 | |
| 1254 double interval_ms = | |
| 1255 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1256 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1257 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
|
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1258 if (recent_avg_pause_time_ratio() < 0.0 || |
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1259 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1260 #ifndef PRODUCT |
|
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1261 // Dump info to allow post-facto debugging |
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1262 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1263 gclog_or_tty->print_cr("-------------------------------------------"); |
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1264 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1265 _recent_gc_times_ms->dump(); |
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1266 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1267 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1268 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1269 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
|
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1270 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1271 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1272 #endif // !PRODUCT |
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1273 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1274 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
|
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1275 if (_recent_avg_pause_time_ratio < 0.0) { |
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1276 _recent_avg_pause_time_ratio = 0.0; |
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1277 } else { |
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1278 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1279 _recent_avg_pause_time_ratio = 1.0; |
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1280 } |
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1281 } |
| 342 | 1282 } |
| 1283 | |
| 1284 if (G1PolicyVerbose > 1) { | |
| 1285 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1286 } | |
| 1287 | |
| 1707 | 1288 PauseSummary* summary = _summary; |
| 342 | 1289 |
| 1290 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
| 1291 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
| 1292 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
| 1293 double update_rs_processed_buffers = | |
| 1294 sum_of_values(_par_last_update_rs_processed_buffers); | |
| 1295 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
| 1296 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
| 1297 double termination_time = avg_value(_par_last_termination_times_ms); | |
| 1298 | |
|
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1299 double parallel_other_time = _cur_collection_par_time_ms - |
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1300 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
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1301 scan_rs_time + obj_copy_time + termination_time); |
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1302 if (update_stats) { |
| 342 | 1303 MainBodySummary* body_summary = summary->main_body_summary(); |
| 1304 guarantee(body_summary != NULL, "should not be null!"); | |
| 1305 | |
| 1306 if (_satb_drain_time_set) | |
| 1307 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
| 1308 else | |
| 1309 body_summary->record_satb_drain_time_ms(0.0); | |
| 1310 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
| 1311 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
| 1312 body_summary->record_update_rs_time_ms(update_rs_time); | |
| 1313 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
| 1314 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
| 1315 if (parallel) { | |
| 1316 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
| 1317 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
| 1318 body_summary->record_termination_time_ms(termination_time); | |
| 1319 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
| 1320 } | |
| 1321 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
| 1322 } | |
| 1323 | |
| 1324 if (G1PolicyVerbose > 1) { | |
| 1325 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1326 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1327 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1328 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
| 1329 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1330 " |RS|: " SIZE_FORMAT, | |
| 1331 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
| 1332 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
| 1333 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
| 1334 evac_ms, recent_avg_time_for_evac_ms(), | |
| 1335 scan_rs_time, | |
| 1336 recent_avg_time_for_pauses_ms() - | |
| 1337 recent_avg_time_for_G1_strong_ms(), | |
| 1338 rs_size); | |
| 1339 | |
| 1340 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1341 " At end " SIZE_FORMAT "K\n" | |
| 1342 " garbage : " SIZE_FORMAT "K" | |
| 1343 " of " SIZE_FORMAT "K\n" | |
| 1344 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1345 _cur_collection_pause_used_at_start_bytes/K, | |
| 1346 _g1->used()/K, freed_bytes/K, | |
| 1347 _collection_set_bytes_used_before/K, | |
| 1348 survival_fraction*100.0, | |
| 1349 recent_avg_survival_fraction()*100.0); | |
| 1350 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1351 recent_avg_pause_time_ratio() * 100.0); | |
| 1352 } | |
| 1353 | |
| 1354 double other_time_ms = elapsed_ms; | |
| 1355 | |
| 1707 | 1356 if (_satb_drain_time_set) { |
| 1357 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1358 } | |
| 1359 | |
| 1360 if (parallel) { | |
| 1361 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1362 } else { | |
| 1363 other_time_ms -= | |
| 1364 update_rs_time + | |
| 1365 ext_root_scan_time + mark_stack_scan_time + | |
| 1366 scan_rs_time + obj_copy_time; | |
| 342 | 1367 } |
| 1368 | |
| 1369 if (PrintGCDetails) { | |
| 1707 | 1370 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
| 342 | 1371 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1372 elapsed_ms / 1000.0); | |
| 1373 | |
| 1707 | 1374 if (_satb_drain_time_set) { |
| 1375 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
| 1376 } | |
| 1377 if (_last_satb_drain_processed_buffers >= 0) { | |
| 1378 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
| 1379 } | |
| 1380 if (parallel) { | |
| 1381 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 1382 print_par_stats(2, "GC Worker Start Time", | |
| 1383 _par_last_gc_worker_start_times_ms, false); | |
| 1384 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
| 1385 print_par_sizes(3, "Processed Buffers", | |
| 1386 _par_last_update_rs_processed_buffers, true); | |
| 1387 print_par_stats(2, "Ext Root Scanning", | |
| 1388 _par_last_ext_root_scan_times_ms); | |
| 1389 print_par_stats(2, "Mark Stack Scanning", | |
| 1390 _par_last_mark_stack_scan_times_ms); | |
| 1391 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
| 1392 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1393 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 1394 print_par_sizes(3, "Termination Attempts", | |
| 1395 _par_last_termination_attempts, true); | |
| 1396 print_par_stats(2, "GC Worker End Time", | |
| 1397 _par_last_gc_worker_end_times_ms, false); | |
| 1398 print_stats(2, "Other", parallel_other_time); | |
| 1399 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
| 1400 } else { | |
| 1401 print_stats(1, "Update RS", update_rs_time); | |
| 1402 print_stats(2, "Processed Buffers", | |
| 1403 (int)update_rs_processed_buffers); | |
| 1404 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
| 1405 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1406 print_stats(1, "Scan RS", scan_rs_time); | |
| 1407 print_stats(1, "Object Copying", obj_copy_time); | |
| 342 | 1408 } |
|
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1409 #ifndef PRODUCT |
|
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1410 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
|
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1411 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
|
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1412 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1413 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
|
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1414 if (_num_cc_clears > 0) { |
|
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1415 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1416 } |
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1417 #endif |
| 342 | 1418 print_stats(1, "Other", other_time_ms); |
|
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1419 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1420 |
| 342 | 1421 for (int i = 0; i < _aux_num; ++i) { |
| 1422 if (_cur_aux_times_set[i]) { | |
| 1423 char buffer[96]; | |
| 1424 sprintf(buffer, "Aux%d", i); | |
| 1425 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1426 } | |
| 1427 } | |
| 1428 } | |
| 1429 if (PrintGCDetails) | |
| 1430 gclog_or_tty->print(" ["); | |
| 1431 if (PrintGC || PrintGCDetails) | |
| 1432 _g1->print_size_transition(gclog_or_tty, | |
| 1433 _cur_collection_pause_used_at_start_bytes, | |
| 1434 _g1->used(), _g1->capacity()); | |
| 1435 if (PrintGCDetails) | |
| 1436 gclog_or_tty->print_cr("]"); | |
| 1437 | |
| 1438 _all_pause_times_ms->add(elapsed_ms); | |
|
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1439 if (update_stats) { |
|
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1440 summary->record_total_time_ms(elapsed_ms); |
|
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1441 summary->record_other_time_ms(other_time_ms); |
|
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1442 } |
| 342 | 1443 for (int i = 0; i < _aux_num; ++i) |
| 1444 if (_cur_aux_times_set[i]) | |
| 1445 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1446 | |
| 1447 // Reset marks-between-pauses counter. | |
| 1448 _n_marks_since_last_pause = 0; | |
| 1449 | |
| 1450 // Update the efficiency-since-mark vars. | |
| 1451 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1452 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1453 // This usually happens due to the timer not having the required | |
| 1454 // granularity. Some Linuxes are the usual culprits. | |
| 1455 // We'll just set it to something (arbitrarily) small. | |
| 1456 proc_ms = 1.0; | |
| 1457 } | |
| 1458 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1459 | |
| 1460 bool new_in_marking_window = _in_marking_window; | |
| 1461 bool new_in_marking_window_im = false; | |
|
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1462 if (during_initial_mark_pause()) { |
| 342 | 1463 new_in_marking_window = true; |
| 1464 new_in_marking_window_im = true; | |
| 1465 } | |
| 1466 | |
| 1467 if (in_young_gc_mode()) { | |
| 1468 if (_last_full_young_gc) { | |
| 1469 set_full_young_gcs(false); | |
| 1470 _last_full_young_gc = false; | |
| 1471 } | |
| 1472 | |
| 1473 if ( !_last_young_gc_full ) { | |
| 1474 if ( _should_revert_to_full_young_gcs || | |
| 1475 _known_garbage_ratio < 0.05 || | |
| 1476 (adaptive_young_list_length() && | |
| 1477 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
| 1478 set_full_young_gcs(true); | |
| 1479 } | |
| 1480 } | |
| 1481 _should_revert_to_full_young_gcs = false; | |
| 1482 | |
| 1483 if (_last_young_gc_full && !_during_marking) | |
| 1484 _young_gc_eff_seq->add(cur_efficiency); | |
| 1485 } | |
| 1486 | |
| 1487 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1488 // do that for any other surv rate groupsx | |
| 1489 | |
| 1490 // <NEW PREDICTION> | |
| 1491 | |
| 677 | 1492 if (update_stats) { |
| 342 | 1493 double pause_time_ms = elapsed_ms; |
| 1494 | |
| 1495 size_t diff = 0; | |
| 1496 if (_max_pending_cards >= _pending_cards) | |
| 1497 diff = _max_pending_cards - _pending_cards; | |
| 1498 _pending_card_diff_seq->add((double) diff); | |
| 1499 | |
| 1500 double cost_per_card_ms = 0.0; | |
| 1501 if (_pending_cards > 0) { | |
| 1502 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1503 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1504 } | |
| 1505 | |
| 1506 size_t cards_scanned = _g1->cards_scanned(); | |
| 1507 | |
| 1508 double cost_per_entry_ms = 0.0; | |
| 1509 if (cards_scanned > 10) { | |
| 1510 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1511 if (_last_young_gc_full) | |
| 1512 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1513 else | |
| 1514 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1515 } | |
| 1516 | |
| 1517 if (_max_rs_lengths > 0) { | |
| 1518 double cards_per_entry_ratio = | |
| 1519 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1520 if (_last_young_gc_full) | |
| 1521 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1522 else | |
| 1523 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1524 } | |
| 1525 | |
| 1526 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1527 if (rs_length_diff >= 0) | |
| 1528 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1529 | |
| 1530 size_t copied_bytes = surviving_bytes; | |
| 1531 double cost_per_byte_ms = 0.0; | |
| 1532 if (copied_bytes > 0) { | |
| 1533 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1534 if (_in_marking_window) | |
| 1535 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1536 else | |
| 1537 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1538 } | |
| 1539 | |
| 1540 double all_other_time_ms = pause_time_ms - | |
|
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1541 (update_rs_time + scan_rs_time + obj_copy_time + |
| 342 | 1542 _mark_closure_time_ms + termination_time); |
| 1543 | |
| 1544 double young_other_time_ms = 0.0; | |
| 1545 if (_recorded_young_regions > 0) { | |
| 1546 young_other_time_ms = | |
| 1547 _recorded_young_cset_choice_time_ms + | |
| 1548 _recorded_young_free_cset_time_ms; | |
| 1549 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1550 (double) _recorded_young_regions); | |
| 1551 } | |
| 1552 double non_young_other_time_ms = 0.0; | |
| 1553 if (_recorded_non_young_regions > 0) { | |
| 1554 non_young_other_time_ms = | |
| 1555 _recorded_non_young_cset_choice_time_ms + | |
| 1556 _recorded_non_young_free_cset_time_ms; | |
| 1557 | |
| 1558 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1559 (double) _recorded_non_young_regions); | |
| 1560 } | |
| 1561 | |
| 1562 double constant_other_time_ms = all_other_time_ms - | |
| 1563 (young_other_time_ms + non_young_other_time_ms); | |
| 1564 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1565 | |
| 1566 double survival_ratio = 0.0; | |
| 1567 if (_bytes_in_collection_set_before_gc > 0) { | |
| 1568 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
| 1569 (double) _bytes_in_collection_set_before_gc; | |
| 1570 } | |
| 1571 | |
| 1572 _pending_cards_seq->add((double) _pending_cards); | |
| 1573 _scanned_cards_seq->add((double) cards_scanned); | |
| 1574 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1575 | |
| 1576 double expensive_region_limit_ms = | |
| 751 | 1577 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1578 if (expensive_region_limit_ms < 0.0) { |
| 1579 // this means that the other time was predicted to be longer than | |
| 1580 // than the max pause time | |
| 751 | 1581 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1582 } |
| 1583 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1584 | |
| 1585 if (PREDICTIONS_VERBOSE) { | |
| 1586 gclog_or_tty->print_cr(""); | |
| 1587 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
|
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1588 "REGIONS %d %d %d " |
| 342 | 1589 "PENDING_CARDS %d %d " |
| 1590 "CARDS_SCANNED %d %d " | |
| 1591 "RS_LENGTHS %d %d " | |
| 1592 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1593 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1594 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1595 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1596 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1597 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1598 "ELAPSED %1.6lf %1.6lf ", | |
| 1599 _cur_collection_start_sec, | |
| 1600 (!_last_young_gc_full) ? 2 : | |
| 1601 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1602 _recorded_region_num, | |
| 1603 _recorded_young_regions, | |
| 1604 _recorded_non_young_regions, | |
| 1605 _predicted_pending_cards, _pending_cards, | |
| 1606 _predicted_cards_scanned, cards_scanned, | |
| 1607 _predicted_rs_lengths, _max_rs_lengths, | |
| 1608 _predicted_rs_update_time_ms, update_rs_time, | |
| 1609 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1610 _predicted_survival_ratio, survival_ratio, | |
| 1611 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1612 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1613 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1614 _predicted_non_young_other_time_ms, | |
| 1615 non_young_other_time_ms, | |
| 1616 _vtime_diff_ms, termination_time, | |
| 1617 _predicted_pause_time_ms, elapsed_ms); | |
| 1618 } | |
| 1619 | |
| 1620 if (G1PolicyVerbose > 0) { | |
| 1621 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1622 _predicted_pause_time_ms, | |
| 1623 (_within_target) ? "within" : "outside", | |
| 1624 elapsed_ms); | |
| 1625 } | |
| 1626 | |
| 1627 } | |
| 1628 | |
| 1629 _in_marking_window = new_in_marking_window; | |
| 1630 _in_marking_window_im = new_in_marking_window_im; | |
| 1631 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1632 calculate_young_list_min_length(); | |
|
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1633 calculate_young_list_target_length(); |
| 342 | 1634 |
| 1111 | 1635 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
| 1282 | 1636 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
| 1111 | 1637 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
| 342 | 1638 // </NEW PREDICTION> |
| 1639 } | |
| 1640 | |
| 1641 // <NEW PREDICTION> | |
| 1642 | |
| 1111 | 1643 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
| 1644 double update_rs_processed_buffers, | |
| 1645 double goal_ms) { | |
| 1646 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1647 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
| 1648 | |
| 1282 | 1649 if (G1UseAdaptiveConcRefinement) { |
| 1111 | 1650 const int k_gy = 3, k_gr = 6; |
| 1651 const double inc_k = 1.1, dec_k = 0.9; | |
| 1652 | |
| 1653 int g = cg1r->green_zone(); | |
| 1654 if (update_rs_time > goal_ms) { | |
| 1655 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
| 1656 } else { | |
| 1657 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
| 1658 g = (int)MAX2(g * inc_k, g + 1.0); | |
| 1659 } | |
| 1660 } | |
| 1661 // Change the refinement threads params | |
| 1662 cg1r->set_green_zone(g); | |
| 1663 cg1r->set_yellow_zone(g * k_gy); | |
| 1664 cg1r->set_red_zone(g * k_gr); | |
| 1665 cg1r->reinitialize_threads(); | |
| 1666 | |
| 1667 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
| 1668 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
| 1669 cg1r->yellow_zone()); | |
| 1670 // Change the barrier params | |
| 1671 dcqs.set_process_completed_threshold(processing_threshold); | |
| 1672 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
| 1673 } | |
| 1674 | |
| 1675 int curr_queue_size = dcqs.completed_buffers_num(); | |
| 1676 if (curr_queue_size >= cg1r->yellow_zone()) { | |
| 1677 dcqs.set_completed_queue_padding(curr_queue_size); | |
| 1678 } else { | |
| 1679 dcqs.set_completed_queue_padding(0); | |
| 1680 } | |
| 1681 dcqs.notify_if_necessary(); | |
| 1682 } | |
| 1683 | |
| 342 | 1684 double |
| 1685 G1CollectorPolicy:: | |
| 1686 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 1687 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 1688 | |
| 1689 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1690 size_t young_num = g1h->young_list()->length(); |
| 342 | 1691 if (young_num == 0) |
| 1692 return 0.0; | |
| 1693 | |
| 1694 young_num += adjustment; | |
| 1695 size_t pending_cards = predict_pending_cards(); | |
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1696 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
| 342 | 1697 predict_rs_length_diff(); |
| 1698 size_t card_num; | |
| 1699 if (full_young_gcs()) | |
| 1700 card_num = predict_young_card_num(rs_lengths); | |
| 1701 else | |
| 1702 card_num = predict_non_young_card_num(rs_lengths); | |
| 1703 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 1704 double accum_yg_surv_rate = | |
| 1705 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 1706 | |
| 1707 size_t bytes_to_copy = | |
| 1708 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 1709 | |
| 1710 return | |
| 1711 predict_rs_update_time_ms(pending_cards) + | |
| 1712 predict_rs_scan_time_ms(card_num) + | |
| 1713 predict_object_copy_time_ms(bytes_to_copy) + | |
| 1714 predict_young_other_time_ms(young_num) + | |
| 1715 predict_constant_other_time_ms(); | |
| 1716 } | |
| 1717 | |
| 1718 double | |
| 1719 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 1720 size_t rs_length = predict_rs_length_diff(); | |
| 1721 size_t card_num; | |
| 1722 if (full_young_gcs()) | |
| 1723 card_num = predict_young_card_num(rs_length); | |
| 1724 else | |
| 1725 card_num = predict_non_young_card_num(rs_length); | |
| 1726 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 1727 } | |
| 1728 | |
| 1729 double | |
| 1730 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 1731 size_t scanned_cards) { | |
| 1732 return | |
| 1733 predict_rs_update_time_ms(pending_cards) + | |
| 1734 predict_rs_scan_time_ms(scanned_cards) + | |
| 1735 predict_constant_other_time_ms(); | |
| 1736 } | |
| 1737 | |
| 1738 double | |
| 1739 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 1740 bool young) { | |
| 1741 size_t rs_length = hr->rem_set()->occupied(); | |
| 1742 size_t card_num; | |
| 1743 if (full_young_gcs()) | |
| 1744 card_num = predict_young_card_num(rs_length); | |
| 1745 else | |
| 1746 card_num = predict_non_young_card_num(rs_length); | |
| 1747 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 1748 | |
| 1749 double region_elapsed_time_ms = | |
| 1750 predict_rs_scan_time_ms(card_num) + | |
| 1751 predict_object_copy_time_ms(bytes_to_copy); | |
| 1752 | |
| 1753 if (young) | |
| 1754 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 1755 else | |
| 1756 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 1757 | |
| 1758 return region_elapsed_time_ms; | |
| 1759 } | |
| 1760 | |
| 1761 size_t | |
| 1762 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 1763 size_t bytes_to_copy; | |
| 1764 if (hr->is_marked()) | |
| 1765 bytes_to_copy = hr->max_live_bytes(); | |
| 1766 else { | |
| 1767 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 1768 "invariant" ); | |
| 1769 int age = hr->age_in_surv_rate_group(); | |
| 545 | 1770 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 1771 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 1772 } | |
| 1773 | |
| 1774 return bytes_to_copy; | |
| 1775 } | |
| 1776 | |
| 1777 void | |
| 1778 G1CollectorPolicy::start_recording_regions() { | |
| 1779 _recorded_rs_lengths = 0; | |
| 1780 _recorded_young_regions = 0; | |
| 1781 _recorded_non_young_regions = 0; | |
| 1782 | |
| 1783 #if PREDICTIONS_VERBOSE | |
| 1784 _recorded_marked_bytes = 0; | |
| 1785 _recorded_young_bytes = 0; | |
| 1786 _predicted_bytes_to_copy = 0; | |
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1787 _predicted_rs_lengths = 0; |
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1788 _predicted_cards_scanned = 0; |
| 342 | 1789 #endif // PREDICTIONS_VERBOSE |
| 1790 } | |
| 1791 | |
| 1792 void | |
|
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1793 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
| 342 | 1794 #if PREDICTIONS_VERBOSE |
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1795 if (!young) { |
| 342 | 1796 _recorded_marked_bytes += hr->max_live_bytes(); |
| 1797 } | |
| 1798 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 1799 #endif // PREDICTIONS_VERBOSE | |
| 1800 | |
| 1801 size_t rs_length = hr->rem_set()->occupied(); | |
| 1802 _recorded_rs_lengths += rs_length; | |
| 1803 } | |
| 1804 | |
| 1805 void | |
|
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1806 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1807 assert(!hr->is_young(), "should not call this"); |
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1808 ++_recorded_non_young_regions; |
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1809 record_cset_region_info(hr, false); |
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1810 } |
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1811 |
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1812 void |
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1813 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1814 _recorded_young_regions = n_regions; |
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1815 } |
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1816 |
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1817 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1818 #if PREDICTIONS_VERBOSE |
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1819 _recorded_young_bytes = bytes; |
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1820 #endif // PREDICTIONS_VERBOSE |
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1821 } |
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1822 |
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1823 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1824 _recorded_rs_lengths = rs_lengths; |
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1825 } |
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1826 |
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1827 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1828 _predicted_bytes_to_copy = bytes; |
| 342 | 1829 } |
| 1830 | |
| 1831 void | |
| 1832 G1CollectorPolicy::end_recording_regions() { | |
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1833 // The _predicted_pause_time_ms field is referenced in code |
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1834 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1835 _predicted_pause_time_ms = -1.0; |
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1836 |
| 342 | 1837 #if PREDICTIONS_VERBOSE |
| 1838 _predicted_pending_cards = predict_pending_cards(); | |
| 1839 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 1840 if (full_young_gcs()) | |
| 1841 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 1842 else | |
| 1843 _predicted_cards_scanned += | |
| 1844 predict_non_young_card_num(_predicted_rs_lengths); | |
| 1845 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 1846 | |
| 1847 _predicted_rs_update_time_ms = | |
| 1848 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 1849 _predicted_rs_scan_time_ms = | |
| 1850 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 1851 _predicted_object_copy_time_ms = | |
| 1852 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 1853 _predicted_constant_other_time_ms = | |
| 1854 predict_constant_other_time_ms(); | |
| 1855 _predicted_young_other_time_ms = | |
| 1856 predict_young_other_time_ms(_recorded_young_regions); | |
| 1857 _predicted_non_young_other_time_ms = | |
| 1858 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 1859 | |
| 1860 _predicted_pause_time_ms = | |
| 1861 _predicted_rs_update_time_ms + | |
| 1862 _predicted_rs_scan_time_ms + | |
| 1863 _predicted_object_copy_time_ms + | |
| 1864 _predicted_constant_other_time_ms + | |
| 1865 _predicted_young_other_time_ms + | |
| 1866 _predicted_non_young_other_time_ms; | |
| 1867 #endif // PREDICTIONS_VERBOSE | |
| 1868 } | |
| 1869 | |
| 1870 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 1871 predicted_time_ms) { | |
| 1872 // I don't think we need to do this when in young GC mode since | |
| 1873 // marking will be initiated next time we hit the soft limit anyway... | |
| 1874 if (predicted_time_ms > _expensive_region_limit_ms) { | |
| 1875 if (!in_young_gc_mode()) { | |
| 1876 set_full_young_gcs(true); | |
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1877 // We might want to do something different here. However, |
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1878 // right now we don't support the non-generational G1 mode |
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1879 // (and in fact we are planning to remove the associated code, |
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1880 // see CR 6814390). So, let's leave it as is and this will be |
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1881 // removed some time in the future |
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1882 ShouldNotReachHere(); |
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1883 set_during_initial_mark_pause(); |
| 342 | 1884 } else |
| 1885 // no point in doing another partial one | |
| 1886 _should_revert_to_full_young_gcs = true; | |
| 1887 } | |
| 1888 } | |
| 1889 | |
| 1890 // </NEW PREDICTION> | |
| 1891 | |
| 1892 | |
| 1893 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 1894 double elapsed_ms) { | |
| 1895 _recent_gc_times_ms->add(elapsed_ms); | |
| 1896 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 1897 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 1898 } | |
| 1899 | |
| 1900 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
| 751 | 1901 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
| 342 | 1902 else return _recent_pause_times_ms->avg(); |
| 1903 } | |
| 1904 | |
| 1905 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
| 1906 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
| 751 | 1907 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1908 else return _recent_CH_strong_roots_times_ms->avg(); |
| 1909 } | |
| 1910 | |
| 1911 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
| 1912 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
| 751 | 1913 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1914 else return _recent_G1_strong_roots_times_ms->avg(); |
| 1915 } | |
| 1916 | |
| 1917 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
| 751 | 1918 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
| 342 | 1919 else return _recent_evac_times_ms->avg(); |
| 1920 } | |
| 1921 | |
| 1922 int G1CollectorPolicy::number_of_recent_gcs() { | |
| 1923 assert(_recent_CH_strong_roots_times_ms->num() == | |
| 1924 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
| 1925 assert(_recent_G1_strong_roots_times_ms->num() == | |
| 1926 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
| 1927 assert(_recent_evac_times_ms->num() == | |
| 1928 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
| 1929 assert(_recent_pause_times_ms->num() == | |
| 1930 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 1931 assert(_recent_CS_bytes_used_before->num() == | |
| 1932 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
| 1933 return _recent_pause_times_ms->num(); | |
| 1934 } | |
| 1935 | |
| 1936 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 1937 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1938 _recent_CS_bytes_used_before); | |
| 1939 } | |
| 1940 | |
| 1941 double G1CollectorPolicy::last_survival_fraction() { | |
| 1942 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1943 _recent_CS_bytes_used_before); | |
| 1944 } | |
| 1945 | |
| 1946 double | |
| 1947 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 1948 TruncatedSeq* before) { | |
| 1949 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1950 if (before->sum() > 0.0) { | |
| 1951 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 1952 // We exempt parallel collection from this check because Alloc Buffer | |
| 1953 // fragmentation can produce negative collections. | |
| 1954 // Further, we're now always doing parallel collection. But I'm still | |
| 1955 // leaving this here as a placeholder for a more precise assertion later. | |
| 1956 // (DLD, 10/05.) | |
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1957 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 1958 _g1->evacuation_failed() || |
| 1959 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 1960 return recent_survival_rate; | |
| 1961 } else { | |
| 1962 return 1.0; // Be conservative. | |
| 1963 } | |
| 1964 } | |
| 1965 | |
| 1966 double | |
| 1967 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 1968 TruncatedSeq* before) { | |
| 1969 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1970 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 1971 double last_survival_rate = surviving->last() / before->last(); | |
| 1972 // We exempt parallel collection from this check because Alloc Buffer | |
| 1973 // fragmentation can produce negative collections. | |
| 1974 // Further, we're now always doing parallel collection. But I'm still | |
| 1975 // leaving this here as a placeholder for a more precise assertion later. | |
| 1976 // (DLD, 10/05.) | |
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1977 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
| 342 | 1978 last_survival_rate <= 1.0, "Or bad frac"); |
| 1979 return last_survival_rate; | |
| 1980 } else { | |
| 1981 return 1.0; | |
| 1982 } | |
| 1983 } | |
| 1984 | |
| 1985 static const int survival_min_obs = 5; | |
| 1986 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 1987 static const double min_survival_rate = 0.1; | |
| 1988 | |
| 1989 double | |
| 1990 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 1991 double latest) { | |
| 1992 double res = avg; | |
| 1993 if (number_of_recent_gcs() < survival_min_obs) { | |
| 1994 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 1995 } | |
| 1996 res = MAX2(res, latest); | |
| 1997 res = MAX2(res, min_survival_rate); | |
| 1998 // In the parallel case, LAB fragmentation can produce "negative | |
| 1999 // collections"; so can evac failure. Cap at 1.0 | |
| 2000 res = MIN2(res, 1.0); | |
| 2001 return res; | |
| 2002 } | |
| 2003 | |
| 2004 size_t G1CollectorPolicy::expansion_amount() { | |
| 1356 | 2005 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
| 751 | 2006 // We will double the existing space, or take |
| 2007 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 2008 // space, whichever is smaller, bounded below by a minimum | |
| 2009 // expansion (unless that's all that's left.) | |
| 342 | 2010 const size_t min_expand_bytes = 1*M; |
| 2011 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
| 2012 size_t committed_bytes = _g1->capacity(); | |
| 2013 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2014 size_t expand_bytes; | |
| 2015 size_t expand_bytes_via_pct = | |
| 751 | 2016 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2017 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2018 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2019 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
| 2020 if (G1PolicyVerbose > 1) { | |
| 2021 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
| 2022 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
| 2023 " Answer = %d.\n", | |
| 2024 recent_avg_pause_time_ratio(), | |
| 2025 byte_size_in_proper_unit(committed_bytes), | |
| 2026 proper_unit_for_byte_size(committed_bytes), | |
| 2027 byte_size_in_proper_unit(uncommitted_bytes), | |
| 2028 proper_unit_for_byte_size(uncommitted_bytes), | |
| 2029 byte_size_in_proper_unit(expand_bytes_via_pct), | |
| 2030 proper_unit_for_byte_size(expand_bytes_via_pct), | |
| 2031 byte_size_in_proper_unit(expand_bytes), | |
| 2032 proper_unit_for_byte_size(expand_bytes)); | |
| 2033 } | |
| 2034 return expand_bytes; | |
| 2035 } else { | |
| 2036 return 0; | |
| 2037 } | |
| 2038 } | |
| 2039 | |
| 2040 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2041 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2042 } | |
| 2043 | |
| 2044 class CountCSClosure: public HeapRegionClosure { | |
| 2045 G1CollectorPolicy* _g1_policy; | |
| 2046 public: | |
| 2047 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2048 _g1_policy(g1_policy) {} | |
| 2049 bool doHeapRegion(HeapRegion* r) { | |
| 2050 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2051 return false; | |
| 2052 } | |
| 2053 }; | |
| 2054 | |
| 2055 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2056 CountCSClosure cs_closure(this); | |
| 2057 _g1->collection_set_iterate(&cs_closure); | |
| 2058 } | |
| 2059 | |
| 2060 static void print_indent(int level) { | |
| 2061 for (int j = 0; j < level+1; ++j) | |
| 2062 gclog_or_tty->print(" "); | |
| 2063 } | |
| 2064 | |
| 2065 void G1CollectorPolicy::print_summary (int level, | |
| 2066 const char* str, | |
| 2067 NumberSeq* seq) const { | |
| 2068 double sum = seq->sum(); | |
| 2069 print_indent(level); | |
| 2070 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
| 2071 str, sum / 1000.0, seq->avg()); | |
| 2072 } | |
| 2073 | |
| 2074 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2075 const char* str, | |
| 2076 NumberSeq* seq) const { | |
| 2077 print_summary(level, str, seq); | |
| 2078 print_indent(level + 5); | |
| 2079 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
| 2080 seq->num(), seq->sd(), seq->maximum()); | |
| 2081 } | |
| 2082 | |
| 2083 void G1CollectorPolicy::check_other_times(int level, | |
| 2084 NumberSeq* other_times_ms, | |
| 2085 NumberSeq* calc_other_times_ms) const { | |
| 2086 bool should_print = false; | |
| 2087 | |
| 2088 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2089 fabs(calc_other_times_ms->sum())); | |
| 2090 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2091 fabs(calc_other_times_ms->sum())); | |
| 2092 double sum_ratio = max_sum / min_sum; | |
| 2093 if (sum_ratio > 1.1) { | |
| 2094 should_print = true; | |
| 2095 print_indent(level + 1); | |
| 2096 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
| 2097 } | |
| 2098 | |
| 2099 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2100 fabs(calc_other_times_ms->avg())); | |
| 2101 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2102 fabs(calc_other_times_ms->avg())); | |
| 2103 double avg_ratio = max_avg / min_avg; | |
| 2104 if (avg_ratio > 1.1) { | |
| 2105 should_print = true; | |
| 2106 print_indent(level + 1); | |
| 2107 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
| 2108 } | |
| 2109 | |
| 2110 if (other_times_ms->sum() < -0.01) { | |
| 2111 print_indent(level + 1); | |
| 2112 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
| 2113 } | |
| 2114 | |
| 2115 if (other_times_ms->avg() < -0.01) { | |
| 2116 print_indent(level + 1); | |
| 2117 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
| 2118 } | |
| 2119 | |
| 2120 if (calc_other_times_ms->sum() < -0.01) { | |
| 2121 should_print = true; | |
| 2122 print_indent(level + 1); | |
| 2123 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
| 2124 } | |
| 2125 | |
| 2126 if (calc_other_times_ms->avg() < -0.01) { | |
| 2127 should_print = true; | |
| 2128 print_indent(level + 1); | |
| 2129 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
| 2130 } | |
| 2131 | |
| 2132 if (should_print) | |
| 2133 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2134 } | |
| 2135 | |
| 2136 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
|
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|
2137 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
| 342 | 2138 MainBodySummary* body_summary = summary->main_body_summary(); |
| 2139 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2140 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2141 if (body_summary != NULL) { |
| 2142 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2143 if (parallel) { | |
| 2144 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2145 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2146 print_summary(2, "Ext Root Scanning", | |
| 2147 body_summary->get_ext_root_scan_seq()); | |
| 2148 print_summary(2, "Mark Stack Scanning", | |
| 2149 body_summary->get_mark_stack_scan_seq()); | |
| 2150 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2151 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2152 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2153 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2154 { | |
| 2155 NumberSeq* other_parts[] = { | |
| 2156 body_summary->get_update_rs_seq(), | |
| 2157 body_summary->get_ext_root_scan_seq(), | |
| 2158 body_summary->get_mark_stack_scan_seq(), | |
| 2159 body_summary->get_scan_rs_seq(), | |
| 2160 body_summary->get_obj_copy_seq(), | |
| 2161 body_summary->get_termination_seq() | |
| 2162 }; | |
| 2163 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 1779 | 2164 6, other_parts); |
| 342 | 2165 check_other_times(2, body_summary->get_parallel_other_seq(), |
| 2166 &calc_other_times_ms); | |
| 2167 } | |
| 2168 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2169 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2170 } else { | |
| 2171 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2172 print_summary(1, "Ext Root Scanning", | |
| 2173 body_summary->get_ext_root_scan_seq()); | |
| 2174 print_summary(1, "Mark Stack Scanning", | |
| 2175 body_summary->get_mark_stack_scan_seq()); | |
| 2176 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2177 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2178 } | |
| 2179 } | |
| 2180 print_summary(1, "Other", summary->get_other_seq()); | |
| 2181 { | |
| 1779 | 2182 if (body_summary != NULL) { |
| 2183 NumberSeq calc_other_times_ms; | |
| 2184 if (parallel) { | |
| 2185 // parallel | |
| 2186 NumberSeq* other_parts[] = { | |
| 2187 body_summary->get_satb_drain_seq(), | |
| 2188 body_summary->get_parallel_seq(), | |
| 2189 body_summary->get_clear_ct_seq() | |
| 2190 }; | |
| 2191 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2192 3, other_parts); | |
| 2193 } else { | |
| 2194 // serial | |
| 2195 NumberSeq* other_parts[] = { | |
| 2196 body_summary->get_satb_drain_seq(), | |
| 2197 body_summary->get_update_rs_seq(), | |
| 2198 body_summary->get_ext_root_scan_seq(), | |
| 2199 body_summary->get_mark_stack_scan_seq(), | |
| 2200 body_summary->get_scan_rs_seq(), | |
| 2201 body_summary->get_obj_copy_seq() | |
| 2202 }; | |
| 2203 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2204 6, other_parts); | |
| 2205 } | |
| 2206 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 342 | 2207 } |
| 2208 } | |
| 2209 } else { | |
| 2210 print_indent(0); | |
| 2211 gclog_or_tty->print_cr("none"); | |
| 2212 } | |
| 2213 gclog_or_tty->print_cr(""); | |
| 2214 } | |
| 2215 | |
| 2216 void G1CollectorPolicy::print_tracing_info() const { | |
| 2217 if (TraceGen0Time) { | |
| 2218 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2219 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2220 gclog_or_tty->print_cr(""); | |
| 2221 gclog_or_tty->print_cr(""); | |
| 2222 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2223 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2224 gclog_or_tty->print_cr(""); | |
| 2225 | |
| 677 | 2226 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2227 print_summary(_summary); | |
| 342 | 2228 |
| 2229 gclog_or_tty->print_cr("MISC"); | |
| 2230 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2231 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2232 for (int i = 0; i < _aux_num; ++i) { | |
| 2233 if (_all_aux_times_ms[i].num() > 0) { | |
| 2234 char buffer[96]; | |
| 2235 sprintf(buffer, "Aux%d", i); | |
| 2236 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2237 } | |
| 2238 } | |
| 2239 | |
| 2240 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2241 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2242 "Tenured %8d (%6.2lf%%)", | |
| 2243 all_region_num, | |
| 2244 _region_num_young, | |
| 2245 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2246 _region_num_tenured, | |
| 2247 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2248 } | |
| 2249 if (TraceGen1Time) { | |
| 2250 if (_all_full_gc_times_ms->num() > 0) { | |
| 2251 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2252 _all_full_gc_times_ms->num(), | |
| 2253 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2254 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2255 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2256 _all_full_gc_times_ms->sd(), | |
| 2257 _all_full_gc_times_ms->maximum()); | |
| 2258 } | |
| 2259 } | |
| 2260 } | |
| 2261 | |
| 2262 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2263 #ifndef PRODUCT | |
| 2264 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2265 // add this call for any other surv rate groups | |
| 2266 #endif // PRODUCT | |
| 2267 } | |
| 2268 | |
| 2269 bool | |
| 2270 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
| 2271 assert(in_young_gc_mode(), "should be in young GC mode"); | |
| 2272 bool ret; | |
|
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2273 size_t young_list_length = _g1->young_list()->length(); |
| 545 | 2274 size_t young_list_max_length = _young_list_target_length; |
| 2275 if (G1FixedEdenSize) { | |
| 2276 young_list_max_length -= _max_survivor_regions; | |
| 2277 } | |
| 2278 if (young_list_length < young_list_max_length) { | |
| 342 | 2279 ret = true; |
| 2280 ++_region_num_young; | |
| 2281 } else { | |
| 2282 ret = false; | |
| 2283 ++_region_num_tenured; | |
| 2284 } | |
| 2285 | |
| 2286 return ret; | |
| 2287 } | |
| 2288 | |
| 2289 #ifndef PRODUCT | |
| 2290 // for debugging, bit of a hack... | |
| 2291 static char* | |
| 2292 region_num_to_mbs(int length) { | |
| 2293 static char buffer[64]; | |
| 2294 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2295 double mbs = bytes / (double) (1024 * 1024); | |
| 2296 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2297 return buffer; | |
| 2298 } | |
| 2299 #endif // PRODUCT | |
| 2300 | |
| 545 | 2301 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2302 switch (purpose) { |
| 2303 case GCAllocForSurvived: | |
| 545 | 2304 return _max_survivor_regions; |
| 342 | 2305 case GCAllocForTenured: |
| 545 | 2306 return REGIONS_UNLIMITED; |
| 342 | 2307 default: |
| 545 | 2308 ShouldNotReachHere(); |
| 2309 return REGIONS_UNLIMITED; | |
| 342 | 2310 }; |
| 2311 } | |
| 2312 | |
| 545 | 2313 // Calculates survivor space parameters. |
| 2314 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2315 { | |
| 2316 if (G1FixedSurvivorSpaceSize == 0) { | |
| 2317 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
| 2318 } else { | |
|
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|
2319 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 2320 } |
| 2321 | |
| 2322 if (G1FixedTenuringThreshold) { | |
| 2323 _tenuring_threshold = MaxTenuringThreshold; | |
| 2324 } else { | |
| 2325 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
| 2326 HeapRegion::GrainWords * _max_survivor_regions); | |
| 2327 } | |
| 2328 } | |
| 2329 | |
| 342 | 2330 bool |
| 2331 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
| 2332 word_size) { | |
| 2333 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
| 2334 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
| 2335 | |
|
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2336 size_t young_list_length = _g1->young_list()->length(); |
| 545 | 2337 size_t young_list_max_length = _young_list_target_length; |
| 2338 if (G1FixedEdenSize) { | |
| 2339 young_list_max_length -= _max_survivor_regions; | |
| 2340 } | |
| 2341 bool reached_target_length = young_list_length >= young_list_max_length; | |
| 342 | 2342 |
| 2343 if (in_young_gc_mode()) { | |
| 2344 if (reached_target_length) { | |
|
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|
2345 assert( young_list_length > 0 && _g1->young_list()->length() > 0, |
| 342 | 2346 "invariant" ); |
| 2347 return true; | |
| 2348 } | |
| 2349 } else { | |
| 2350 guarantee( false, "should not reach here" ); | |
| 2351 } | |
| 2352 | |
| 2353 return false; | |
| 2354 } | |
| 2355 | |
| 2356 #ifndef PRODUCT | |
| 2357 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2358 CollectionSetChooser* _chooser; | |
| 2359 public: | |
| 2360 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2361 _chooser(chooser) {} | |
| 2362 | |
| 2363 bool doHeapRegion(HeapRegion* r) { | |
| 2364 if (!r->continuesHumongous()) { | |
| 2365 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2366 } | |
| 2367 return false; | |
| 2368 } | |
| 2369 }; | |
| 2370 | |
| 2371 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2372 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2373 _g1->heap_region_iterate(&cl); | |
| 2374 return true; | |
| 2375 } | |
| 2376 #endif | |
| 2377 | |
|
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2378 bool |
|
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2379 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
|
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2380 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2381 if (!during_cycle) { |
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2382 set_initiate_conc_mark_if_possible(); |
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2383 return true; |
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2384 } else { |
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2385 return false; |
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2386 } |
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2387 } |
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2388 |
| 342 | 2389 void |
|
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2390 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
|
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2391 // We are about to decide on whether this pause will be an |
|
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2392 // initial-mark pause. |
|
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2393 |
|
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2394 // First, during_initial_mark_pause() should not be already set. We |
|
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2395 // will set it here if we have to. However, it should be cleared by |
|
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2396 // the end of the pause (it's only set for the duration of an |
|
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2397 // initial-mark pause). |
|
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2398 assert(!during_initial_mark_pause(), "pre-condition"); |
|
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2399 |
|
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|
2400 if (initiate_conc_mark_if_possible()) { |
|
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2401 // We had noticed on a previous pause that the heap occupancy has |
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2402 // gone over the initiating threshold and we should start a |
|
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2403 // concurrent marking cycle. So we might initiate one. |
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2404 |
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2405 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2406 if (!during_cycle) { |
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2407 // The concurrent marking thread is not "during a cycle", i.e., |
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2408 // it has completed the last one. So we can go ahead and |
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2409 // initiate a new cycle. |
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2410 |
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2411 set_during_initial_mark_pause(); |
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2412 |
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2413 // And we can now clear initiate_conc_mark_if_possible() as |
|
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2414 // we've already acted on it. |
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2415 clear_initiate_conc_mark_if_possible(); |
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2416 } else { |
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2417 // The concurrent marking thread is still finishing up the |
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2418 // previous cycle. If we start one right now the two cycles |
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2419 // overlap. In particular, the concurrent marking thread might |
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2420 // be in the process of clearing the next marking bitmap (which |
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2421 // we will use for the next cycle if we start one). Starting a |
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2422 // cycle now will be bad given that parts of the marking |
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2423 // information might get cleared by the marking thread. And we |
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2424 // cannot wait for the marking thread to finish the cycle as it |
|
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2425 // periodically yields while clearing the next marking bitmap |
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2426 // and, if it's in a yield point, it's waiting for us to |
|
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2427 // finish. So, at this point we will not start a cycle and we'll |
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2428 // let the concurrent marking thread complete the last one. |
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2429 } |
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2430 } |
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2431 } |
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2432 |
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2433 void |
| 342 | 2434 G1CollectorPolicy_BestRegionsFirst:: |
| 2435 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2436 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2437 } | |
| 2438 | |
| 2439 class NextNonCSElemFinder: public HeapRegionClosure { | |
| 2440 HeapRegion* _res; | |
| 2441 public: | |
| 2442 NextNonCSElemFinder(): _res(NULL) {} | |
| 2443 bool doHeapRegion(HeapRegion* r) { | |
| 2444 if (!r->in_collection_set()) { | |
| 2445 _res = r; | |
| 2446 return true; | |
| 2447 } else { | |
| 2448 return false; | |
| 2449 } | |
| 2450 } | |
| 2451 HeapRegion* res() { return _res; } | |
| 2452 }; | |
| 2453 | |
| 2454 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2455 CollectionSetChooser* _hrSorted; | |
| 2456 | |
| 2457 public: | |
| 2458 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2459 _hrSorted(hrSorted) | |
| 2460 {} | |
| 2461 | |
| 2462 bool doHeapRegion(HeapRegion* r) { | |
| 2463 // We only include humongous regions in collection | |
| 2464 // sets when concurrent mark shows that their contained object is | |
| 2465 // unreachable. | |
| 2466 | |
| 2467 // Do we have any marking information for this region? | |
| 2468 if (r->is_marked()) { | |
| 2469 // We don't include humongous regions in collection | |
| 2470 // sets because we collect them immediately at the end of a marking | |
| 2471 // cycle. We also don't include young regions because we *must* | |
| 2472 // include them in the next collection pause. | |
| 2473 if (!r->isHumongous() && !r->is_young()) { | |
| 2474 _hrSorted->addMarkedHeapRegion(r); | |
| 2475 } | |
| 2476 } | |
| 2477 return false; | |
| 2478 } | |
| 2479 }; | |
| 2480 | |
| 2481 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2482 CollectionSetChooser* _hrSorted; | |
| 2483 jint _marked_regions_added; | |
| 2484 jint _chunk_size; | |
| 2485 jint _cur_chunk_idx; | |
| 2486 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2487 int _worker; | |
| 2488 int _invokes; | |
| 2489 | |
| 2490 void get_new_chunk() { | |
| 2491 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2492 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2493 } | |
| 2494 void add_region(HeapRegion* r) { | |
| 2495 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2496 get_new_chunk(); | |
| 2497 } | |
| 2498 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2499 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2500 _marked_regions_added++; | |
| 2501 _cur_chunk_idx++; | |
| 2502 } | |
| 2503 | |
| 2504 public: | |
| 2505 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2506 jint chunk_size, | |
| 2507 int worker) : | |
| 2508 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2509 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2510 _invokes(0) | |
| 2511 {} | |
| 2512 | |
| 2513 bool doHeapRegion(HeapRegion* r) { | |
| 2514 // We only include humongous regions in collection | |
| 2515 // sets when concurrent mark shows that their contained object is | |
| 2516 // unreachable. | |
| 2517 _invokes++; | |
| 2518 | |
| 2519 // Do we have any marking information for this region? | |
| 2520 if (r->is_marked()) { | |
| 2521 // We don't include humongous regions in collection | |
| 2522 // sets because we collect them immediately at the end of a marking | |
| 2523 // cycle. | |
| 2524 // We also do not include young regions in collection sets | |
| 2525 if (!r->isHumongous() && !r->is_young()) { | |
| 2526 add_region(r); | |
| 2527 } | |
| 2528 } | |
| 2529 return false; | |
| 2530 } | |
| 2531 jint marked_regions_added() { return _marked_regions_added; } | |
| 2532 int invokes() { return _invokes; } | |
| 2533 }; | |
| 2534 | |
| 2535 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2536 CollectionSetChooser* _hrSorted; | |
| 2537 jint _chunk_size; | |
| 2538 G1CollectedHeap* _g1; | |
| 2539 public: | |
| 2540 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2541 AbstractGangTask("ParKnownGarbageTask"), | |
| 2542 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2543 _g1(G1CollectedHeap::heap()) | |
| 2544 {} | |
| 2545 | |
| 2546 void work(int i) { | |
| 2547 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2548 // Back to zero for the claim value. | |
| 355 | 2549 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2550 HeapRegion::InitialClaimValue); | |
| 342 | 2551 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2552 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2553 if (G1PrintParCleanupStats) { | |
| 2554 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
| 2555 i, parKnownGarbageCl.invokes(), regions_added); | |
| 2556 } | |
| 2557 } | |
| 2558 }; | |
| 2559 | |
| 2560 void | |
| 2561 G1CollectorPolicy_BestRegionsFirst:: | |
| 2562 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2563 size_t max_live_bytes) { | |
| 2564 double start; | |
| 2565 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2566 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2567 | |
| 2568 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2569 double clear_marked_end; | |
| 2570 if (G1PrintParCleanupStats) { | |
| 2571 clear_marked_end = os::elapsedTime(); | |
| 2572 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2573 (clear_marked_end - start)*1000.0); | |
| 2574 } | |
|
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2575 if (G1CollectedHeap::use_parallel_gc_threads()) { |
| 342 | 2576 const size_t OverpartitionFactor = 4; |
|
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2577 const size_t MinWorkUnit = 8; |
|
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2578 const size_t WorkUnit = |
| 342 | 2579 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
|
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2580 MinWorkUnit); |
| 342 | 2581 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2582 WorkUnit); |
| 342 | 2583 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2584 (int) WorkUnit); |
| 342 | 2585 _g1->workers()->run_task(&parKnownGarbageTask); |
| 355 | 2586 |
| 2587 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2588 "sanity check"); | |
| 342 | 2589 } else { |
| 2590 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2591 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2592 } | |
| 2593 double known_garbage_end; | |
| 2594 if (G1PrintParCleanupStats) { | |
| 2595 known_garbage_end = os::elapsedTime(); | |
| 2596 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2597 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2598 } | |
| 2599 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2600 double sort_end; | |
| 2601 if (G1PrintParCleanupStats) { | |
| 2602 sort_end = os::elapsedTime(); | |
| 2603 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2604 (sort_end - known_garbage_end)*1000.0); | |
| 2605 } | |
| 2606 | |
| 2607 record_concurrent_mark_cleanup_end_work2(); | |
| 2608 double work2_end; | |
| 2609 if (G1PrintParCleanupStats) { | |
| 2610 work2_end = os::elapsedTime(); | |
| 2611 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2612 (work2_end - sort_end)*1000.0); | |
| 2613 } | |
| 2614 } | |
| 2615 | |
|
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2616 // Add the heap region at the head of the non-incremental collection set |
| 342 | 2617 void G1CollectorPolicy:: |
| 2618 add_to_collection_set(HeapRegion* hr) { | |
|
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2619 assert(_inc_cset_build_state == Active, "Precondition"); |
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2620 assert(!hr->is_young(), "non-incremental add of young region"); |
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2621 |
| 1282 | 2622 if (G1PrintHeapRegions) { |
| 1388 | 2623 gclog_or_tty->print_cr("added region to cset " |
| 2624 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 2625 "top "PTR_FORMAT", %s", | |
| 2626 hr->hrs_index(), hr->bottom(), hr->end(), | |
| 2627 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
| 342 | 2628 } |
| 2629 | |
| 2630 if (_g1->mark_in_progress()) | |
| 2631 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2632 | |
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2633 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
| 342 | 2634 hr->set_in_collection_set(true); |
| 2635 hr->set_next_in_collection_set(_collection_set); | |
| 2636 _collection_set = hr; | |
| 2637 _collection_set_size++; | |
| 2638 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2639 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2640 } |
| 2641 | |
|
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2642 // Initialize the per-collection-set information |
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2643 void G1CollectorPolicy::start_incremental_cset_building() { |
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2644 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2645 |
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2646 _inc_cset_head = NULL; |
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2647 _inc_cset_tail = NULL; |
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2648 _inc_cset_size = 0; |
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2649 _inc_cset_bytes_used_before = 0; |
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2650 |
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2651 if (in_young_gc_mode()) { |
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2652 _inc_cset_young_index = 0; |
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2653 } |
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2654 |
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2655 _inc_cset_max_finger = 0; |
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2656 _inc_cset_recorded_young_bytes = 0; |
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2657 _inc_cset_recorded_rs_lengths = 0; |
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2658 _inc_cset_predicted_elapsed_time_ms = 0; |
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2659 _inc_cset_predicted_bytes_to_copy = 0; |
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2660 _inc_cset_build_state = Active; |
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2661 } |
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2662 |
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|
2663 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2664 // This routine is used when: |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2665 // * adding survivor regions to the incremental cset at the end of an |
|
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|
2666 // evacuation pause, |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2667 // * adding the current allocation region to the incremental cset |
|
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changeset
|
2668 // when it is retired, and |
|
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diff
changeset
|
2669 // * updating existing policy information for a region in the |
|
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diff
changeset
|
2670 // incremental cset via young list RSet sampling. |
|
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diff
changeset
|
2671 // Therefore this routine may be called at a safepoint by the |
|
1316cec51b4d
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diff
changeset
|
2672 // VM thread, or in-between safepoints by mutator threads (when |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2673 // retiring the current allocation region) or a concurrent |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2674 // refine thread (RSet sampling). |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2675 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2676 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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|
2677 size_t used_bytes = hr->used(); |
|
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changeset
|
2678 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2679 _inc_cset_recorded_rs_lengths += rs_length; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2680 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
|
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diff
changeset
|
2681 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2682 _inc_cset_bytes_used_before += used_bytes; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2683 |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2684 // Cache the values we have added to the aggregated informtion |
|
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diff
changeset
|
2685 // in the heap region in case we have to remove this region from |
|
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changeset
|
2686 // the incremental collection set, or it is updated by the |
|
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diff
changeset
|
2687 // rset sampling code |
|
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changeset
|
2688 hr->set_recorded_rs_length(rs_length); |
|
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changeset
|
2689 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
|
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|
2690 |
|
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diff
changeset
|
2691 #if PREDICTIONS_VERBOSE |
|
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|
2692 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
|
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changeset
|
2693 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
|
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changeset
|
2694 |
|
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diff
changeset
|
2695 // Record the number of bytes used in this region |
|
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changeset
|
2696 _inc_cset_recorded_young_bytes += used_bytes; |
|
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diff
changeset
|
2697 |
|
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diff
changeset
|
2698 // Cache the values we have added to the aggregated informtion |
|
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changeset
|
2699 // in the heap region in case we have to remove this region from |
|
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changeset
|
2700 // the incremental collection set, or it is updated by the |
|
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diff
changeset
|
2701 // rset sampling code |
|
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diff
changeset
|
2702 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
|
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changeset
|
2703 #endif // PREDICTIONS_VERBOSE |
|
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changeset
|
2704 } |
|
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diff
changeset
|
2705 |
|
1316cec51b4d
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diff
changeset
|
2706 void G1CollectorPolicy::remove_from_incremental_cset_info(HeapRegion* hr) { |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2707 // This routine is currently only called as part of the updating of |
|
1316cec51b4d
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parents:
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diff
changeset
|
2708 // existing policy information for regions in the incremental cset that |
|
1316cec51b4d
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parents:
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diff
changeset
|
2709 // is performed by the concurrent refine thread(s) as part of young list |
|
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parents:
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changeset
|
2710 // RSet sampling. Therefore we should not be at a safepoint. |
|
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diff
changeset
|
2711 |
|
1316cec51b4d
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diff
changeset
|
2712 assert(!SafepointSynchronize::is_at_safepoint(), "should not be at safepoint"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2713 assert(hr->is_young(), "it should be"); |
|
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changeset
|
2714 |
|
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diff
changeset
|
2715 size_t used_bytes = hr->used(); |
|
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diff
changeset
|
2716 size_t old_rs_length = hr->recorded_rs_length(); |
|
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changeset
|
2717 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
|
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diff
changeset
|
2718 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2719 // Subtract the old recorded/predicted policy information for |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2720 // the given heap region from the collection set info. |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2721 _inc_cset_recorded_rs_lengths -= old_rs_length; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2722 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2723 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2724 _inc_cset_bytes_used_before -= used_bytes; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2725 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2726 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2727 hr->set_recorded_rs_length(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2728 hr->set_predicted_elapsed_time_ms(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2729 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2730 #if PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2731 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2732 _inc_cset_predicted_bytes_to_copy -= old_predicted_bytes_to_copy; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2733 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2734 // Subtract the number of bytes used in this region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2735 _inc_cset_recorded_young_bytes -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2736 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2737 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2738 hr->set_predicted_bytes_to_copy(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2739 #endif // PREDICTIONS_VERBOSE |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2740 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2741 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2742 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, size_t new_rs_length) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2743 // Update the collection set information that is dependent on the new RS length |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2744 assert(hr->is_young(), "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2745 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2746 remove_from_incremental_cset_info(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2747 add_to_incremental_cset_info(hr, new_rs_length); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2748 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2749 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2750 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2751 assert( hr->is_young(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2752 assert( hr->young_index_in_cset() == -1, "invariant" ); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2753 assert(_inc_cset_build_state == Active, "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2754 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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1391
diff
changeset
|
2755 // We need to clear and set the cached recorded/cached collection set |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2756 // information in the heap region here (before the region gets added |
|
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diff
changeset
|
2757 // to the collection set). An individual heap region's cached values |
|
1316cec51b4d
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diff
changeset
|
2758 // are calculated, aggregated with the policy collection set info, |
|
1316cec51b4d
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diff
changeset
|
2759 // and cached in the heap region here (initially) and (subsequently) |
|
1316cec51b4d
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parents:
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diff
changeset
|
2760 // by the Young List sampling code. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2761 |
|
1316cec51b4d
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diff
changeset
|
2762 size_t rs_length = hr->rem_set()->occupied(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2763 add_to_incremental_cset_info(hr, rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2764 |
|
1316cec51b4d
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diff
changeset
|
2765 HeapWord* hr_end = hr->end(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2766 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
|
1316cec51b4d
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diff
changeset
|
2767 |
|
1316cec51b4d
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diff
changeset
|
2768 assert(!hr->in_collection_set(), "invariant"); |
|
1316cec51b4d
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parents:
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diff
changeset
|
2769 hr->set_in_collection_set(true); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2770 assert( hr->next_in_collection_set() == NULL, "invariant"); |
|
1316cec51b4d
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parents:
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diff
changeset
|
2771 |
|
1316cec51b4d
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parents:
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diff
changeset
|
2772 _inc_cset_size++; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2773 _g1->register_region_with_in_cset_fast_test(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2774 |
|
1316cec51b4d
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parents:
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diff
changeset
|
2775 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
2776 ++_inc_cset_young_index; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2777 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2778 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2779 // Add the region at the RHS of the incremental cset |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2780 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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changeset
|
2781 // We should only ever be appending survivors at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2782 assert( hr->is_survivor(), "Logic"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2783 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2785 add_region_to_incremental_cset_common(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2786 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2787 // Now add the region at the right hand side |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2788 if (_inc_cset_tail == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2789 assert(_inc_cset_head == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2790 _inc_cset_head = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2791 } else { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2792 _inc_cset_tail->set_next_in_collection_set(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2793 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2794 _inc_cset_tail = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2796 if (G1PrintHeapRegions) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2797 gclog_or_tty->print_cr(" added region to incremental cset (RHS) " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2798 "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2799 "top "PTR_FORMAT", young %s", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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changeset
|
2800 hr->hrs_index(), hr->bottom(), hr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2801 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2802 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2803 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2804 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2805 // Add the region to the LHS of the incremental cset |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2806 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2807 // Survivors should be added to the RHS at the end of a pause |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2808 assert(!hr->is_survivor(), "Logic"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2809 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2810 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2811 add_region_to_incremental_cset_common(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2812 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2813 // Add the region at the left hand side |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2814 hr->set_next_in_collection_set(_inc_cset_head); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2815 if (_inc_cset_head == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2816 assert(_inc_cset_tail == NULL, "Invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2817 _inc_cset_tail = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2818 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2819 _inc_cset_head = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2820 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2821 if (G1PrintHeapRegions) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2822 gclog_or_tty->print_cr(" added region to incremental cset (LHS) " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2823 "%d:["PTR_FORMAT", "PTR_FORMAT"], " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2824 "top "PTR_FORMAT", young %s", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2825 hr->hrs_index(), hr->bottom(), hr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2826 hr->top(), (hr->is_young()) ? "YES" : "NO"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2827 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2828 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2829 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2830 #ifndef PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2831 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2832 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2833 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2834 st->print_cr("\nCollection_set:"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2835 HeapRegion* csr = list_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2836 while (csr != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2837 HeapRegion* next = csr->next_in_collection_set(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2838 assert(csr->in_collection_set(), "bad CS"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2839 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2840 "age: %4d, y: %d, surv: %d", |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2841 csr->bottom(), csr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2842 csr->top(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2843 csr->prev_top_at_mark_start(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2844 csr->next_top_at_mark_start(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2845 csr->top_at_conc_mark_count(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2846 csr->age_in_surv_rate_group_cond(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2847 csr->is_young(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2848 csr->is_survivor()); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2849 csr = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2850 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2851 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2852 #endif // !PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2853 |
| 1707 | 2854 void |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2855 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2856 double target_pause_time_ms) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2857 // Set this here - in case we're not doing young collections. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2858 double non_young_start_time_sec = os::elapsedTime(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2859 |
| 342 | 2860 start_recording_regions(); |
| 2861 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2862 guarantee(target_pause_time_ms > 0.0, |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2863 err_msg("target_pause_time_ms = %1.6lf should be positive", |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2864 target_pause_time_ms)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2865 guarantee(_collection_set == NULL, "Precondition"); |
| 342 | 2866 |
| 2867 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2868 double predicted_pause_time_ms = base_time_ms; | |
| 2869 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2870 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
| 342 | 2871 |
| 2872 // the 10% and 50% values are arbitrary... | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2873 if (time_remaining_ms < 0.10 * target_pause_time_ms) { |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2874 time_remaining_ms = 0.50 * target_pause_time_ms; |
| 342 | 2875 _within_target = false; |
| 2876 } else { | |
| 2877 _within_target = true; | |
| 2878 } | |
| 2879 | |
| 2880 // We figure out the number of bytes available for future to-space. | |
| 2881 // For new regions without marking information, we must assume the | |
| 2882 // worst-case of complete survival. If we have marking information for a | |
| 2883 // region, we can bound the amount of live data. We can add a number of | |
| 2884 // such regions, as long as the sum of the live data bounds does not | |
| 2885 // exceed the available evacuation space. | |
| 2886 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
| 2887 | |
| 2888 size_t expansion_bytes = | |
| 2889 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
| 2890 | |
| 677 | 2891 _collection_set_bytes_used_before = 0; |
| 2892 _collection_set_size = 0; | |
| 342 | 2893 |
| 2894 // Adjust for expansion and slop. | |
| 2895 max_live_bytes = max_live_bytes + expansion_bytes; | |
| 2896 | |
| 677 | 2897 assert(_g1->regions_accounted_for(), "Region leakage!"); |
| 342 | 2898 |
| 2899 HeapRegion* hr; | |
| 2900 if (in_young_gc_mode()) { | |
| 2901 double young_start_time_sec = os::elapsedTime(); | |
| 2902 | |
| 2903 if (G1PolicyVerbose > 0) { | |
| 2904 gclog_or_tty->print_cr("Adding %d young regions to the CSet", | |
|
1394
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2905 _g1->young_list()->length()); |
| 342 | 2906 } |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2907 |
| 342 | 2908 _young_cset_length = 0; |
| 2909 _last_young_gc_full = full_young_gcs() ? true : false; | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2910 |
| 342 | 2911 if (_last_young_gc_full) |
| 2912 ++_full_young_pause_num; | |
| 2913 else | |
| 2914 ++_partial_young_pause_num; | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2915 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2916 // The young list is laid with the survivor regions from the previous |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2917 // pause are appended to the RHS of the young list, i.e. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2918 // [Newly Young Regions ++ Survivors from last pause]. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2919 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2920 hr = _g1->young_list()->first_survivor_region(); |
| 342 | 2921 while (hr != NULL) { |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2922 assert(hr->is_survivor(), "badly formed young list"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2923 hr->set_young(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2924 hr = hr->get_next_young_region(); |
| 342 | 2925 } |
| 2926 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2927 // Clear the fields that point to the survivor list - they are |
|
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2928 // all young now. |
|
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2929 _g1->young_list()->clear_survivors(); |
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2930 |
|
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2931 if (_g1->mark_in_progress()) |
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2932 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
|
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2933 |
|
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2934 _young_cset_length = _inc_cset_young_index; |
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2935 _collection_set = _inc_cset_head; |
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2936 _collection_set_size = _inc_cset_size; |
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2937 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
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2938 |
|
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2939 // For young regions in the collection set, we assume the worst |
|
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2940 // case of complete survival |
|
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2941 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
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2942 |
|
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2943 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
|
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2944 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
|
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2945 |
|
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2946 // The number of recorded young regions is the incremental |
|
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2947 // collection set's current size |
|
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2948 set_recorded_young_regions(_inc_cset_size); |
|
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2949 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
|
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2950 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
|
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2951 #if PREDICTIONS_VERBOSE |
|
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2952 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
|
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2953 #endif // PREDICTIONS_VERBOSE |
|
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2954 |
|
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2955 if (G1PolicyVerbose > 0) { |
|
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2956 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
|
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|
2957 _inc_cset_size); |
|
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|
2958 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
|
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|
2959 max_live_bytes/K); |
|
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|
2960 } |
|
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|
2961 |
|
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|
2962 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
| 342 | 2963 |
| 2964 double young_end_time_sec = os::elapsedTime(); | |
| 2965 _recorded_young_cset_choice_time_ms = | |
| 2966 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
| 2967 | |
|
1394
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|
2968 // We are doing young collections so reset this. |
|
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|
2969 non_young_start_time_sec = young_end_time_sec; |
|
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|
2970 |
|
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|
2971 // Note we can use either _collection_set_size or |
|
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|
2972 // _young_cset_length here |
|
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|
2973 if (_collection_set_size > 0 && _last_young_gc_full) { |
| 342 | 2974 // don't bother adding more regions... |
| 2975 goto choose_collection_set_end; | |
| 2976 } | |
| 2977 } | |
| 2978 | |
| 2979 if (!in_young_gc_mode() || !full_young_gcs()) { | |
| 2980 bool should_continue = true; | |
| 2981 NumberSeq seq; | |
| 2982 double avg_prediction = 100000000000000000.0; // something very large | |
|
1394
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|
2983 |
| 342 | 2984 do { |
| 2985 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 2986 avg_prediction); | |
| 677 | 2987 if (hr != NULL) { |
| 342 | 2988 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 2989 time_remaining_ms -= predicted_time_ms; | |
| 2990 predicted_pause_time_ms += predicted_time_ms; | |
| 2991 add_to_collection_set(hr); | |
|
1394
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|
2992 record_non_young_cset_region(hr); |
| 342 | 2993 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
| 2994 if (G1PolicyVerbose > 0) { | |
| 2995 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 2996 max_live_bytes/K); | |
| 2997 } | |
| 2998 seq.add(predicted_time_ms); | |
| 2999 avg_prediction = seq.avg() + seq.sd(); | |
| 3000 } | |
| 3001 should_continue = | |
| 3002 ( hr != NULL) && | |
| 3003 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
| 3004 : _collection_set_size < _young_list_fixed_length ); | |
| 3005 } while (should_continue); | |
| 3006 | |
| 3007 if (!adaptive_young_list_length() && | |
| 3008 _collection_set_size < _young_list_fixed_length) | |
| 3009 _should_revert_to_full_young_gcs = true; | |
| 3010 } | |
| 3011 | |
| 3012 choose_collection_set_end: | |
|
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|
3013 stop_incremental_cset_building(); |
|
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|
3014 |
| 342 | 3015 count_CS_bytes_used(); |
| 3016 | |
| 3017 end_recording_regions(); | |
| 3018 | |
| 3019 double non_young_end_time_sec = os::elapsedTime(); | |
| 3020 _recorded_non_young_cset_choice_time_ms = | |
| 3021 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 3022 } | |
| 3023 | |
| 3024 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 3025 G1CollectorPolicy::record_full_collection_end(); | |
| 3026 _collectionSetChooser->updateAfterFullCollection(); | |
| 3027 } | |
| 3028 | |
| 3029 void G1CollectorPolicy_BestRegionsFirst:: | |
| 3030 expand_if_possible(size_t numRegions) { | |
| 3031 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
| 3032 _g1->expand(expansion_bytes); | |
| 3033 } | |
| 3034 | |
| 3035 void G1CollectorPolicy_BestRegionsFirst:: | |
| 1707 | 3036 record_collection_pause_end() { |
| 3037 G1CollectorPolicy::record_collection_pause_end(); | |
| 342 | 3038 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 3039 } |