Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 1707:0ce1569c90e5
6963209: G1: remove the concept of abandoned pauses
Summary: As part of 6944166 we disabled the concept of abandoned pauses (i.e., if the collection set is empty, we would still try to do a pause even if it is to update the RSets and scan the roots). This changeset removes the code and structures associated with abandoned pauses.
Reviewed-by: iveresov, johnc
| author | tonyp |
|---|---|
| date | Wed, 04 Aug 2010 13:03:23 -0400 |
| parents | 2d160770d2e5 |
| children | 6eddcbe17c83 |
| 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 | |
| 25 #include "incls/_precompiled.incl" | |
| 26 #include "incls/_g1CollectorPolicy.cpp.incl" | |
| 27 | |
| 28 #define PREDICTIONS_VERBOSE 0 | |
| 29 | |
| 30 // <NEW PREDICTION> | |
| 31 | |
| 32 // Different defaults for different number of GC threads | |
| 33 // They were chosen by running GCOld and SPECjbb on debris with different | |
| 34 // numbers of GC threads and choosing them based on the results | |
| 35 | |
| 36 // all the same | |
| 37 static double rs_length_diff_defaults[] = { | |
| 38 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
| 39 }; | |
| 40 | |
| 41 static double cost_per_card_ms_defaults[] = { | |
| 42 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
| 43 }; | |
| 44 | |
| 45 // all the same | |
| 46 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
| 47 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
| 48 }; | |
| 49 | |
| 50 static double cost_per_entry_ms_defaults[] = { | |
| 51 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
| 52 }; | |
| 53 | |
| 54 static double cost_per_byte_ms_defaults[] = { | |
| 55 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
| 56 }; | |
| 57 | |
| 58 // these should be pretty consistent | |
| 59 static double constant_other_time_ms_defaults[] = { | |
| 60 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
| 61 }; | |
| 62 | |
| 63 | |
| 64 static double young_other_cost_per_region_ms_defaults[] = { | |
| 65 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
| 66 }; | |
| 67 | |
| 68 static double non_young_other_cost_per_region_ms_defaults[] = { | |
| 69 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
| 70 }; | |
| 71 | |
| 72 // </NEW PREDICTION> | |
| 73 | |
| 74 G1CollectorPolicy::G1CollectorPolicy() : | |
| 75 _parallel_gc_threads((ParallelGCThreads > 0) ? ParallelGCThreads : 1), | |
| 76 _n_pauses(0), | |
| 77 _recent_CH_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 78 _recent_G1_strong_roots_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 79 _recent_evac_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 80 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 81 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 82 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 83 _all_pause_times_ms(new NumberSeq()), | |
| 84 _stop_world_start(0.0), | |
| 85 _all_stop_world_times_ms(new NumberSeq()), | |
| 86 _all_yield_times_ms(new NumberSeq()), | |
| 87 | |
| 88 _all_mod_union_times_ms(new NumberSeq()), | |
| 89 | |
| 677 | 90 _summary(new Summary()), |
| 342 | 91 |
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92 #ifndef PRODUCT |
| 342 | 93 _cur_clear_ct_time_ms(0.0), |
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94 _min_clear_cc_time_ms(-1.0), |
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95 _max_clear_cc_time_ms(-1.0), |
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96 _cur_clear_cc_time_ms(0.0), |
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97 _cum_clear_cc_time_ms(0.0), |
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98 _num_cc_clears(0L), |
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99 #endif |
| 342 | 100 |
| 101 _region_num_young(0), | |
| 102 _region_num_tenured(0), | |
| 103 _prev_region_num_young(0), | |
| 104 _prev_region_num_tenured(0), | |
| 105 | |
| 106 _aux_num(10), | |
| 107 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
| 108 _cur_aux_start_times_ms(new double[_aux_num]), | |
| 109 _cur_aux_times_ms(new double[_aux_num]), | |
| 110 _cur_aux_times_set(new bool[_aux_num]), | |
| 111 | |
| 112 _concurrent_mark_init_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 113 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 114 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 115 | |
| 116 // <NEW PREDICTION> | |
| 117 | |
| 118 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 119 _prev_collection_pause_end_ms(0.0), | |
| 120 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 121 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 122 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 123 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 124 _partially_young_cards_per_entry_ratio_seq( | |
| 125 new TruncatedSeq(TruncatedSeqLength)), | |
| 126 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 127 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 128 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 129 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 130 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 131 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 132 _non_young_other_cost_per_region_ms_seq( | |
| 133 new TruncatedSeq(TruncatedSeqLength)), | |
| 134 | |
| 135 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 136 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 137 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 138 | |
| 751 | 139 _pause_time_target_ms((double) MaxGCPauseMillis), |
| 342 | 140 |
| 141 // </NEW PREDICTION> | |
| 142 | |
| 143 _in_young_gc_mode(false), | |
| 144 _full_young_gcs(true), | |
| 145 _full_young_pause_num(0), | |
| 146 _partial_young_pause_num(0), | |
| 147 | |
| 148 _during_marking(false), | |
| 149 _in_marking_window(false), | |
| 150 _in_marking_window_im(false), | |
| 151 | |
| 152 _known_garbage_ratio(0.0), | |
| 153 _known_garbage_bytes(0), | |
| 154 | |
| 155 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
| 156 | |
| 157 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 158 | |
| 159 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 160 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
| 161 | |
| 162 _recent_avg_pause_time_ratio(0.0), | |
| 163 _num_markings(0), | |
| 164 _n_marks(0), | |
| 165 _n_pauses_at_mark_end(0), | |
| 166 | |
| 167 _all_full_gc_times_ms(new NumberSeq()), | |
| 168 | |
| 169 // G1PausesBtwnConcMark defaults to -1 | |
| 170 // so the hack is to do the cast QQQ FIXME | |
| 171 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
| 172 _n_marks_since_last_pause(0), | |
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173 _initiate_conc_mark_if_possible(false), |
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174 _during_initial_mark_pause(false), |
| 342 | 175 _should_revert_to_full_young_gcs(false), |
| 176 _last_full_young_gc(false), | |
| 177 | |
| 178 _prev_collection_pause_used_at_end_bytes(0), | |
| 179 | |
| 180 _collection_set(NULL), | |
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181 _collection_set_size(0), |
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182 _collection_set_bytes_used_before(0), |
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183 |
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184 // Incremental CSet attributes |
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185 _inc_cset_build_state(Inactive), |
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186 _inc_cset_head(NULL), |
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187 _inc_cset_tail(NULL), |
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188 _inc_cset_size(0), |
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189 _inc_cset_young_index(0), |
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190 _inc_cset_bytes_used_before(0), |
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191 _inc_cset_max_finger(NULL), |
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192 _inc_cset_recorded_young_bytes(0), |
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193 _inc_cset_recorded_rs_lengths(0), |
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194 _inc_cset_predicted_elapsed_time_ms(0.0), |
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195 _inc_cset_predicted_bytes_to_copy(0), |
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196 |
| 342 | 197 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
| 198 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
| 199 #endif // _MSC_VER | |
| 200 | |
| 201 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
| 202 G1YoungSurvRateNumRegionsSummary)), | |
| 203 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
| 545 | 204 G1YoungSurvRateNumRegionsSummary)), |
| 342 | 205 // add here any more surv rate groups |
| 545 | 206 _recorded_survivor_regions(0), |
| 207 _recorded_survivor_head(NULL), | |
| 208 _recorded_survivor_tail(NULL), | |
| 1356 | 209 _survivors_age_table(true), |
| 210 | |
| 211 _gc_overhead_perc(0.0) | |
| 545 | 212 |
| 342 | 213 { |
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214 // Set up the region size and associated fields. Given that the |
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215 // policy is created before the heap, we have to set this up here, |
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216 // so it's done as soon as possible. |
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217 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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218 HeapRegionRemSet::setup_remset_size(); |
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219 |
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220 // Verify PLAB sizes |
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221 const uint region_size = HeapRegion::GrainWords; |
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222 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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223 char buffer[128]; |
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224 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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225 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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226 vm_exit_during_initialization(buffer); |
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227 } |
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228 |
| 342 | 229 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
| 230 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
| 231 | |
| 1611 | 232 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
| 342 | 233 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
| 234 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
| 235 | |
| 236 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
| 237 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
| 238 | |
| 239 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
| 240 | |
| 241 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
| 242 | |
| 243 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
| 1611 | 244 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
| 245 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
| 342 | 246 |
| 247 // start conservatively | |
| 751 | 248 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
| 342 | 249 |
| 250 // <NEW PREDICTION> | |
| 251 | |
| 252 int index; | |
| 253 if (ParallelGCThreads == 0) | |
| 254 index = 0; | |
| 255 else if (ParallelGCThreads > 8) | |
| 256 index = 7; | |
| 257 else | |
| 258 index = ParallelGCThreads - 1; | |
| 259 | |
| 260 _pending_card_diff_seq->add(0.0); | |
| 261 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
| 262 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
| 263 _fully_young_cards_per_entry_ratio_seq->add( | |
| 264 fully_young_cards_per_entry_ratio_defaults[index]); | |
| 265 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
| 266 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
| 267 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
| 268 _young_other_cost_per_region_ms_seq->add( | |
| 269 young_other_cost_per_region_ms_defaults[index]); | |
| 270 _non_young_other_cost_per_region_ms_seq->add( | |
| 271 non_young_other_cost_per_region_ms_defaults[index]); | |
| 272 | |
| 273 // </NEW PREDICTION> | |
| 274 | |
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275 // Below, we might need to calculate the pause time target based on |
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276 // the pause interval. When we do so we are going to give G1 maximum |
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277 // flexibility and allow it to do pauses when it needs to. So, we'll |
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278 // arrange that the pause interval to be pause time target + 1 to |
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279 // ensure that a) the pause time target is maximized with respect to |
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280 // the pause interval and b) we maintain the invariant that pause |
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281 // time target < pause interval. If the user does not want this |
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282 // maximum flexibility, they will have to set the pause interval |
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283 // explicitly. |
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284 |
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285 // First make sure that, if either parameter is set, its value is |
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286 // reasonable. |
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287 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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288 if (MaxGCPauseMillis < 1) { |
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289 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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290 "greater than 0"); |
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291 } |
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292 } |
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293 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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294 if (GCPauseIntervalMillis < 1) { |
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295 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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296 "greater than 0"); |
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297 } |
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298 } |
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299 |
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300 // Then, if the pause time target parameter was not set, set it to |
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301 // the default value. |
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302 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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303 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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304 // The default pause time target in G1 is 200ms |
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305 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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306 } else { |
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307 // We do not allow the pause interval to be set without the |
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308 // pause time target |
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309 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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310 "without setting MaxGCPauseMillis"); |
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311 } |
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312 } |
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313 |
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314 // Then, if the interval parameter was not set, set it according to |
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315 // the pause time target (this will also deal with the case when the |
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316 // pause time target is the default value). |
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317 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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318 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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319 } |
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320 |
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321 // Finally, make sure that the two parameters are consistent. |
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322 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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323 char buffer[256]; |
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324 jio_snprintf(buffer, 256, |
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325 "MaxGCPauseMillis (%u) should be less than " |
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326 "GCPauseIntervalMillis (%u)", |
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327 MaxGCPauseMillis, GCPauseIntervalMillis); |
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328 vm_exit_during_initialization(buffer); |
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329 } |
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330 |
| 751 | 331 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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332 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
| 342 | 333 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
| 751 | 334 _sigma = (double) G1ConfidencePercent / 100.0; |
| 342 | 335 |
| 336 // start conservatively (around 50ms is about right) | |
| 337 _concurrent_mark_init_times_ms->add(0.05); | |
| 338 _concurrent_mark_remark_times_ms->add(0.05); | |
| 339 _concurrent_mark_cleanup_times_ms->add(0.20); | |
| 340 _tenuring_threshold = MaxTenuringThreshold; | |
| 341 | |
| 1282 | 342 // if G1FixedSurvivorSpaceSize is 0 which means the size is not |
| 343 // fixed, then _max_survivor_regions will be calculated at | |
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344 // calculate_young_list_target_length during initialization |
| 1282 | 345 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 346 |
| 1356 | 347 assert(GCTimeRatio > 0, |
| 348 "we should have set it to a default value set_g1_gc_flags() " | |
| 349 "if a user set it to 0"); | |
| 350 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
| 351 | |
| 342 | 352 initialize_all(); |
| 353 } | |
| 354 | |
| 355 // Increment "i", mod "len" | |
| 356 static void inc_mod(int& i, int len) { | |
| 357 i++; if (i == len) i = 0; | |
| 358 } | |
| 359 | |
| 360 void G1CollectorPolicy::initialize_flags() { | |
| 361 set_min_alignment(HeapRegion::GrainBytes); | |
| 362 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
|
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363 if (SurvivorRatio < 1) { |
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364 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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365 } |
| 342 | 366 CollectorPolicy::initialize_flags(); |
| 367 } | |
| 368 | |
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369 // The easiest way to deal with the parsing of the NewSize / |
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370 // MaxNewSize / etc. parameteres is to re-use the code in the |
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371 // TwoGenerationCollectorPolicy class. This is similar to what |
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372 // ParallelScavenge does with its GenerationSizer class (see |
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373 // ParallelScavengeHeap::initialize()). We might change this in the |
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374 // future, but it's a good start. |
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375 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
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376 size_t size_to_region_num(size_t byte_size) { |
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377 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); |
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378 } |
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379 |
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380 public: |
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381 G1YoungGenSizer() { |
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382 initialize_flags(); |
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383 initialize_size_info(); |
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384 } |
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385 |
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386 size_t min_young_region_num() { |
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387 return size_to_region_num(_min_gen0_size); |
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388 } |
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389 size_t initial_young_region_num() { |
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390 return size_to_region_num(_initial_gen0_size); |
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391 } |
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392 size_t max_young_region_num() { |
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393 return size_to_region_num(_max_gen0_size); |
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394 } |
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395 }; |
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396 |
| 342 | 397 void G1CollectorPolicy::init() { |
| 398 // Set aside an initial future to_space. | |
| 399 _g1 = G1CollectedHeap::heap(); | |
| 400 | |
| 401 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
| 402 | |
| 545 | 403 initialize_gc_policy_counters(); |
| 404 | |
| 342 | 405 if (G1Gen) { |
| 406 _in_young_gc_mode = true; | |
| 407 | |
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408 G1YoungGenSizer sizer; |
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409 size_t initial_region_num = sizer.initial_young_region_num(); |
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410 |
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411 if (UseAdaptiveSizePolicy) { |
| 342 | 412 set_adaptive_young_list_length(true); |
| 413 _young_list_fixed_length = 0; | |
| 414 } else { | |
| 415 set_adaptive_young_list_length(false); | |
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416 _young_list_fixed_length = initial_region_num; |
| 342 | 417 } |
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418 _free_regions_at_end_of_collection = _g1->free_regions(); |
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419 calculate_young_list_min_length(); |
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420 guarantee( _young_list_min_length == 0, "invariant, not enough info" ); |
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421 calculate_young_list_target_length(); |
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422 } else { |
| 342 | 423 _young_list_fixed_length = 0; |
| 424 _in_young_gc_mode = false; | |
| 425 } | |
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426 |
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427 // We may immediately start allocating regions and placing them on the |
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428 // collection set list. Initialize the per-collection set info |
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429 start_incremental_cset_building(); |
| 342 | 430 } |
| 431 | |
| 545 | 432 // Create the jstat counters for the policy. |
| 433 void G1CollectorPolicy::initialize_gc_policy_counters() | |
| 434 { | |
| 435 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 2 + G1Gen); | |
| 436 } | |
| 437 | |
| 342 | 438 void G1CollectorPolicy::calculate_young_list_min_length() { |
| 439 _young_list_min_length = 0; | |
| 440 | |
| 441 if (!adaptive_young_list_length()) | |
| 442 return; | |
| 443 | |
| 444 if (_alloc_rate_ms_seq->num() > 3) { | |
| 445 double now_sec = os::elapsedTime(); | |
| 446 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; | |
| 447 double alloc_rate_ms = predict_alloc_rate_ms(); | |
| 448 int min_regions = (int) ceil(alloc_rate_ms * when_ms); | |
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449 int current_region_num = (int) _g1->young_list()->length(); |
| 342 | 450 _young_list_min_length = min_regions + current_region_num; |
| 451 } | |
| 452 } | |
| 453 | |
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454 void G1CollectorPolicy::calculate_young_list_target_length() { |
| 342 | 455 if (adaptive_young_list_length()) { |
| 456 size_t rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); | |
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457 calculate_young_list_target_length(rs_lengths); |
| 342 | 458 } else { |
| 459 if (full_young_gcs()) | |
| 460 _young_list_target_length = _young_list_fixed_length; | |
| 461 else | |
| 462 _young_list_target_length = _young_list_fixed_length / 2; | |
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463 |
| 342 | 464 _young_list_target_length = MAX2(_young_list_target_length, (size_t)1); |
| 465 } | |
| 545 | 466 calculate_survivors_policy(); |
| 342 | 467 } |
| 468 | |
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469 void G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths) { |
| 342 | 470 guarantee( adaptive_young_list_length(), "pre-condition" ); |
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471 guarantee( !_in_marking_window || !_last_full_young_gc, "invariant" ); |
| 342 | 472 |
| 473 double start_time_sec = os::elapsedTime(); | |
| 1282 | 474 size_t min_reserve_perc = MAX2((size_t)2, (size_t)G1ReservePercent); |
| 342 | 475 min_reserve_perc = MIN2((size_t) 50, min_reserve_perc); |
| 476 size_t reserve_regions = | |
| 477 (size_t) ((double) min_reserve_perc * (double) _g1->n_regions() / 100.0); | |
| 478 | |
| 479 if (full_young_gcs() && _free_regions_at_end_of_collection > 0) { | |
| 480 // we are in fully-young mode and there are free regions in the heap | |
| 481 | |
| 545 | 482 double survivor_regions_evac_time = |
| 483 predict_survivor_regions_evac_time(); | |
| 484 | |
| 342 | 485 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
| 486 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); | |
| 487 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); | |
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488 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
| 545 | 489 double base_time_ms = predict_base_elapsed_time_ms(pending_cards, scanned_cards) |
| 490 + survivor_regions_evac_time; | |
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491 |
| 342 | 492 // the result |
| 493 size_t final_young_length = 0; | |
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494 |
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495 size_t init_free_regions = |
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496 MAX2((size_t)0, _free_regions_at_end_of_collection - reserve_regions); |
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497 |
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498 // if we're still under the pause target... |
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499 if (base_time_ms <= target_pause_time_ms) { |
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500 // We make sure that the shortest young length that makes sense |
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501 // fits within the target pause time. |
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502 size_t min_young_length = 1; |
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503 |
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504 if (predict_will_fit(min_young_length, base_time_ms, |
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505 init_free_regions, target_pause_time_ms)) { |
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506 // The shortest young length will fit within the target pause time; |
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507 // we'll now check whether the absolute maximum number of young |
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508 // regions will fit in the target pause time. If not, we'll do |
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509 // a binary search between min_young_length and max_young_length |
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510 size_t abs_max_young_length = _free_regions_at_end_of_collection - 1; |
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511 size_t max_young_length = abs_max_young_length; |
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512 |
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513 if (max_young_length > min_young_length) { |
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514 // Let's check if the initial max young length will fit within the |
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515 // target pause. If so then there is no need to search for a maximal |
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516 // young length - we'll return the initial maximum |
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517 |
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518 if (predict_will_fit(max_young_length, base_time_ms, |
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519 init_free_regions, target_pause_time_ms)) { |
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520 // The maximum young length will satisfy the target pause time. |
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521 // We are done so set min young length to this maximum length. |
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522 // The code after the loop will then set final_young_length using |
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523 // the value cached in the minimum length. |
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524 min_young_length = max_young_length; |
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525 } else { |
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526 // The maximum possible number of young regions will not fit within |
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527 // the target pause time so let's search.... |
| 342 | 528 |
| 529 size_t diff = (max_young_length - min_young_length) / 2; | |
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530 max_young_length = min_young_length + diff; |
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531 |
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532 while (max_young_length > min_young_length) { |
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533 if (predict_will_fit(max_young_length, base_time_ms, |
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534 init_free_regions, target_pause_time_ms)) { |
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535 |
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536 // The current max young length will fit within the target |
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537 // pause time. Note we do not exit the loop here. By setting |
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538 // min = max, and then increasing the max below means that |
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539 // we will continue searching for an upper bound in the |
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540 // range [max..max+diff] |
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541 min_young_length = max_young_length; |
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542 } |
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543 diff = (max_young_length - min_young_length) / 2; |
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544 max_young_length = min_young_length + diff; |
| 342 | 545 } |
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546 // the above loop found a maximal young length that will fit |
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547 // within the target pause time. |
| 342 | 548 } |
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549 assert(min_young_length <= abs_max_young_length, "just checking"); |
| 342 | 550 } |
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551 final_young_length = min_young_length; |
| 342 | 552 } |
| 553 } | |
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554 // and we're done! |
| 342 | 555 |
| 556 // we should have at least one region in the target young length | |
| 545 | 557 _young_list_target_length = |
| 558 MAX2((size_t) 1, final_young_length + _recorded_survivor_regions); | |
| 342 | 559 |
| 560 // let's keep an eye of how long we spend on this calculation | |
| 561 // right now, I assume that we'll print it when we need it; we | |
| 562 // should really adde it to the breakdown of a pause | |
| 563 double end_time_sec = os::elapsedTime(); | |
| 564 double elapsed_time_ms = (end_time_sec - start_time_sec) * 1000.0; | |
| 565 | |
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566 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 567 // leave this in for debugging, just in case |
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568 gclog_or_tty->print_cr("target = %1.1lf ms, young = " SIZE_FORMAT ", " |
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569 "elapsed %1.2lf ms, (%s%s) " SIZE_FORMAT SIZE_FORMAT, |
| 342 | 570 target_pause_time_ms, |
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571 _young_list_target_length |
| 342 | 572 elapsed_time_ms, |
| 573 full_young_gcs() ? "full" : "partial", | |
|
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574 during_initial_mark_pause() ? " i-m" : "", |
| 545 | 575 _in_marking_window, |
| 576 _in_marking_window_im); | |
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577 #endif // TRACE_CALC_YOUNG_LENGTH |
| 342 | 578 |
| 579 if (_young_list_target_length < _young_list_min_length) { | |
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580 // bummer; this means that, if we do a pause when the maximal |
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581 // length dictates, we'll violate the pause spacing target (the |
| 342 | 582 // min length was calculate based on the application's current |
| 583 // alloc rate); | |
| 584 | |
| 585 // so, we have to bite the bullet, and allocate the minimum | |
| 586 // number. We'll violate our target, but we just can't meet it. | |
| 587 | |
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588 #ifdef TRACE_CALC_YOUNG_LENGTH |
| 342 | 589 // leave this in for debugging, just in case |
| 590 gclog_or_tty->print_cr("adjusted target length from " | |
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591 SIZE_FORMAT " to " SIZE_FORMAT, |
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592 _young_list_target_length, _young_list_min_length); |
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593 #endif // TRACE_CALC_YOUNG_LENGTH |
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594 |
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595 _young_list_target_length = _young_list_min_length; |
| 342 | 596 } |
| 597 } else { | |
| 598 // we are in a partially-young mode or we've run out of regions (due | |
| 599 // to evacuation failure) | |
| 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("(partial) setting target to " SIZE_FORMAT | |
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604 _young_list_min_length); |
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605 #endif // TRACE_CALC_YOUNG_LENGTH |
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606 // we'll do the pause as soon as possible by choosing the minimum |
| 342 | 607 _young_list_target_length = |
| 608 MAX2(_young_list_min_length, (size_t) 1); | |
| 609 } | |
| 610 | |
| 611 _rs_lengths_prediction = rs_lengths; | |
| 612 } | |
| 613 | |
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614 // This is used by: calculate_young_list_target_length(rs_length). It |
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615 // returns true iff: |
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616 // the predicted pause time for the given young list will not overflow |
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617 // the target pause time |
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618 // and: |
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619 // the predicted amount of surviving data will not overflow the |
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620 // the amount of free space available for survivor regions. |
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621 // |
| 342 | 622 bool |
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623 G1CollectorPolicy::predict_will_fit(size_t young_length, |
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624 double base_time_ms, |
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625 size_t init_free_regions, |
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626 double target_pause_time_ms) { |
| 342 | 627 |
| 628 if (young_length >= init_free_regions) | |
| 629 // end condition 1: not enough space for the young regions | |
| 630 return false; | |
| 631 | |
| 632 double accum_surv_rate_adj = 0.0; | |
| 633 double accum_surv_rate = | |
| 634 accum_yg_surv_rate_pred((int)(young_length - 1)) - accum_surv_rate_adj; | |
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635 |
| 342 | 636 size_t bytes_to_copy = |
| 637 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); | |
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638 |
| 342 | 639 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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640 |
| 342 | 641 double young_other_time_ms = |
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642 predict_young_other_time_ms(young_length); |
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643 |
| 342 | 644 double pause_time_ms = |
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645 base_time_ms + copy_time_ms + young_other_time_ms; |
| 342 | 646 |
| 647 if (pause_time_ms > target_pause_time_ms) | |
| 648 // end condition 2: over the target pause time | |
| 649 return false; | |
| 650 | |
| 651 size_t free_bytes = | |
| 652 (init_free_regions - young_length) * HeapRegion::GrainBytes; | |
| 653 | |
| 654 if ((2.0 + sigma()) * (double) bytes_to_copy > (double) free_bytes) | |
| 655 // end condition 3: out of to-space (conservatively) | |
| 656 return false; | |
| 657 | |
| 658 // success! | |
| 659 return true; | |
| 660 } | |
| 661 | |
| 545 | 662 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
| 663 double survivor_regions_evac_time = 0.0; | |
| 664 for (HeapRegion * r = _recorded_survivor_head; | |
| 665 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
| 666 r = r->get_next_young_region()) { | |
| 667 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
| 668 } | |
| 669 return survivor_regions_evac_time; | |
| 670 } | |
| 671 | |
| 342 | 672 void G1CollectorPolicy::check_prediction_validity() { |
| 673 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); | |
| 674 | |
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675 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
| 342 | 676 if (rs_lengths > _rs_lengths_prediction) { |
| 677 // add 10% to avoid having to recalculate often | |
| 678 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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679 calculate_young_list_target_length(rs_lengths_prediction); |
| 342 | 680 } |
| 681 } | |
| 682 | |
| 683 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, | |
| 684 bool is_tlab, | |
| 685 bool* gc_overhead_limit_was_exceeded) { | |
| 686 guarantee(false, "Not using this policy feature yet."); | |
| 687 return NULL; | |
| 688 } | |
| 689 | |
| 690 // This method controls how a collector handles one or more | |
| 691 // of its generations being fully allocated. | |
| 692 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
| 693 bool is_tlab) { | |
| 694 guarantee(false, "Not using this policy feature yet."); | |
| 695 return NULL; | |
| 696 } | |
| 697 | |
| 698 | |
| 699 #ifndef PRODUCT | |
| 700 bool G1CollectorPolicy::verify_young_ages() { | |
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701 HeapRegion* head = _g1->young_list()->first_region(); |
| 342 | 702 return |
| 703 verify_young_ages(head, _short_lived_surv_rate_group); | |
| 704 // also call verify_young_ages on any additional surv rate groups | |
| 705 } | |
| 706 | |
| 707 bool | |
| 708 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
| 709 SurvRateGroup *surv_rate_group) { | |
| 710 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
| 711 | |
| 712 const char* name = surv_rate_group->name(); | |
| 713 bool ret = true; | |
| 714 int prev_age = -1; | |
| 715 | |
| 716 for (HeapRegion* curr = head; | |
| 717 curr != NULL; | |
| 718 curr = curr->get_next_young_region()) { | |
| 719 SurvRateGroup* group = curr->surv_rate_group(); | |
| 720 if (group == NULL && !curr->is_survivor()) { | |
| 721 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
| 722 ret = false; | |
| 723 } | |
| 724 | |
| 725 if (surv_rate_group == group) { | |
| 726 int age = curr->age_in_surv_rate_group(); | |
| 727 | |
| 728 if (age < 0) { | |
| 729 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
| 730 ret = false; | |
| 731 } | |
| 732 | |
| 733 if (age <= prev_age) { | |
| 734 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
| 735 "(%d, %d)", name, age, prev_age); | |
| 736 ret = false; | |
| 737 } | |
| 738 prev_age = age; | |
| 739 } | |
| 740 } | |
| 741 | |
| 742 return ret; | |
| 743 } | |
| 744 #endif // PRODUCT | |
| 745 | |
| 746 void G1CollectorPolicy::record_full_collection_start() { | |
| 747 _cur_collection_start_sec = os::elapsedTime(); | |
| 748 // Release the future to-space so that it is available for compaction into. | |
| 749 _g1->set_full_collection(); | |
| 750 } | |
| 751 | |
| 752 void G1CollectorPolicy::record_full_collection_end() { | |
| 753 // Consider this like a collection pause for the purposes of allocation | |
| 754 // since last pause. | |
| 755 double end_sec = os::elapsedTime(); | |
| 756 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
| 757 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
| 758 | |
| 759 _all_full_gc_times_ms->add(full_gc_time_ms); | |
| 760 | |
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761 update_recent_gc_times(end_sec, full_gc_time_ms); |
| 342 | 762 |
| 763 _g1->clear_full_collection(); | |
| 764 | |
| 765 // "Nuke" the heuristics that control the fully/partially young GC | |
| 766 // transitions and make sure we start with fully young GCs after the | |
| 767 // Full GC. | |
| 768 set_full_young_gcs(true); | |
| 769 _last_full_young_gc = false; | |
| 770 _should_revert_to_full_young_gcs = false; | |
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771 clear_initiate_conc_mark_if_possible(); |
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772 clear_during_initial_mark_pause(); |
| 342 | 773 _known_garbage_bytes = 0; |
| 774 _known_garbage_ratio = 0.0; | |
| 775 _in_marking_window = false; | |
| 776 _in_marking_window_im = false; | |
| 777 | |
| 778 _short_lived_surv_rate_group->start_adding_regions(); | |
| 779 // also call this on any additional surv rate groups | |
| 780 | |
| 545 | 781 record_survivor_regions(0, NULL, NULL); |
| 782 | |
| 342 | 783 _prev_region_num_young = _region_num_young; |
| 784 _prev_region_num_tenured = _region_num_tenured; | |
| 785 | |
| 786 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 545 | 787 // Reset survivors SurvRateGroup. |
| 788 _survivor_surv_rate_group->reset(); | |
| 342 | 789 calculate_young_list_min_length(); |
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790 calculate_young_list_target_length(); |
| 342 | 791 } |
| 792 | |
| 793 void G1CollectorPolicy::record_before_bytes(size_t bytes) { | |
| 794 _bytes_in_to_space_before_gc += bytes; | |
| 795 } | |
| 796 | |
| 797 void G1CollectorPolicy::record_after_bytes(size_t bytes) { | |
| 798 _bytes_in_to_space_after_gc += bytes; | |
| 799 } | |
| 800 | |
| 801 void G1CollectorPolicy::record_stop_world_start() { | |
| 802 _stop_world_start = os::elapsedTime(); | |
| 803 } | |
| 804 | |
| 805 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
| 806 size_t start_used) { | |
| 807 if (PrintGCDetails) { | |
| 808 gclog_or_tty->stamp(PrintGCTimeStamps); | |
| 809 gclog_or_tty->print("[GC pause"); | |
| 810 if (in_young_gc_mode()) | |
| 811 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); | |
| 812 } | |
| 813 | |
| 814 assert(_g1->used_regions() == _g1->recalculate_used_regions(), | |
| 815 "sanity"); | |
| 636 | 816 assert(_g1->used() == _g1->recalculate_used(), "sanity"); |
| 342 | 817 |
| 818 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
| 819 _all_stop_world_times_ms->add(s_w_t_ms); | |
| 820 _stop_world_start = 0.0; | |
| 821 | |
| 822 _cur_collection_start_sec = start_time_sec; | |
| 823 _cur_collection_pause_used_at_start_bytes = start_used; | |
| 824 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
| 825 _pending_cards = _g1->pending_card_num(); | |
| 826 _max_pending_cards = _g1->max_pending_card_num(); | |
| 827 | |
| 828 _bytes_in_to_space_before_gc = 0; | |
| 829 _bytes_in_to_space_after_gc = 0; | |
| 830 _bytes_in_collection_set_before_gc = 0; | |
| 831 | |
| 832 #ifdef DEBUG | |
| 833 // initialise these to something well known so that we can spot | |
| 834 // if they are not set properly | |
| 835 | |
| 836 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
| 1611 | 837 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
| 838 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
| 839 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
| 840 _par_last_update_rs_times_ms[i] = -1234.0; | |
| 841 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
| 842 _par_last_scan_rs_times_ms[i] = -1234.0; | |
| 843 _par_last_obj_copy_times_ms[i] = -1234.0; | |
| 844 _par_last_termination_times_ms[i] = -1234.0; | |
| 845 _par_last_termination_attempts[i] = -1234.0; | |
| 846 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
| 342 | 847 } |
| 848 #endif | |
| 849 | |
| 850 for (int i = 0; i < _aux_num; ++i) { | |
| 851 _cur_aux_times_ms[i] = 0.0; | |
| 852 _cur_aux_times_set[i] = false; | |
| 853 } | |
| 854 | |
| 855 _satb_drain_time_set = false; | |
| 856 _last_satb_drain_processed_buffers = -1; | |
| 857 | |
| 858 if (in_young_gc_mode()) | |
| 859 _last_young_gc_full = false; | |
| 860 | |
| 861 // do that for any other surv rate groups | |
| 862 _short_lived_surv_rate_group->stop_adding_regions(); | |
| 1282 | 863 _survivors_age_table.clear(); |
| 545 | 864 |
| 342 | 865 assert( verify_young_ages(), "region age verification" ); |
| 866 } | |
| 867 | |
| 868 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
| 869 _mark_closure_time_ms = mark_closure_time_ms; | |
| 870 } | |
| 871 | |
| 872 void G1CollectorPolicy::record_concurrent_mark_init_start() { | |
| 873 _mark_init_start_sec = os::elapsedTime(); | |
| 874 guarantee(!in_young_gc_mode(), "should not do be here in young GC mode"); | |
| 875 } | |
| 876 | |
| 877 void G1CollectorPolicy::record_concurrent_mark_init_end_pre(double | |
| 878 mark_init_elapsed_time_ms) { | |
| 879 _during_marking = true; | |
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880 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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881 clear_during_initial_mark_pause(); |
| 342 | 882 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
| 883 } | |
| 884 | |
| 885 void G1CollectorPolicy::record_concurrent_mark_init_end() { | |
| 886 double end_time_sec = os::elapsedTime(); | |
| 887 double elapsed_time_ms = (end_time_sec - _mark_init_start_sec) * 1000.0; | |
| 888 _concurrent_mark_init_times_ms->add(elapsed_time_ms); | |
| 889 record_concurrent_mark_init_end_pre(elapsed_time_ms); | |
| 890 | |
| 891 _mmu_tracker->add_pause(_mark_init_start_sec, end_time_sec, true); | |
| 892 } | |
| 893 | |
| 894 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
| 895 _mark_remark_start_sec = os::elapsedTime(); | |
| 896 _during_marking = false; | |
| 897 } | |
| 898 | |
| 899 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
| 900 double end_time_sec = os::elapsedTime(); | |
| 901 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
| 902 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
| 903 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 904 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 905 | |
| 906 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
| 907 } | |
| 908 | |
| 909 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
| 910 _mark_cleanup_start_sec = os::elapsedTime(); | |
| 911 } | |
| 912 | |
| 913 void | |
| 914 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 915 size_t max_live_bytes) { | |
| 916 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 917 record_concurrent_mark_cleanup_end_work2(); | |
| 918 } | |
| 919 | |
| 920 void | |
| 921 G1CollectorPolicy:: | |
| 922 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
| 923 size_t max_live_bytes) { | |
| 924 if (_n_marks < 2) _n_marks++; | |
| 925 if (G1PolicyVerbose > 0) | |
| 926 gclog_or_tty->print_cr("At end of marking, max_live is " SIZE_FORMAT " MB " | |
| 927 " (of " SIZE_FORMAT " MB heap).", | |
| 928 max_live_bytes/M, _g1->capacity()/M); | |
| 929 } | |
| 930 | |
| 931 // The important thing about this is that it includes "os::elapsedTime". | |
| 932 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
| 933 double end_time_sec = os::elapsedTime(); | |
| 934 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
| 935 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
| 936 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
| 937 _prev_collection_pause_end_ms += elapsed_time_ms; | |
| 938 | |
| 939 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
| 940 | |
| 941 _num_markings++; | |
| 942 | |
| 943 // We did a marking, so reset the "since_last_mark" variables. | |
| 944 double considerConcMarkCost = 1.0; | |
| 945 // If there are available processors, concurrent activity is free... | |
| 946 if (Threads::number_of_non_daemon_threads() * 2 < | |
| 947 os::active_processor_count()) { | |
| 948 considerConcMarkCost = 0.0; | |
| 949 } | |
| 950 _n_pauses_at_mark_end = _n_pauses; | |
| 951 _n_marks_since_last_pause++; | |
| 952 } | |
| 953 | |
| 954 void | |
| 955 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
| 956 if (in_young_gc_mode()) { | |
| 957 _should_revert_to_full_young_gcs = false; | |
| 958 _last_full_young_gc = true; | |
| 959 _in_marking_window = false; | |
| 960 if (adaptive_young_list_length()) | |
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961 calculate_young_list_target_length(); |
| 342 | 962 } |
| 963 } | |
| 964 | |
| 965 void G1CollectorPolicy::record_concurrent_pause() { | |
| 966 if (_stop_world_start > 0.0) { | |
| 967 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
| 968 _all_yield_times_ms->add(yield_ms); | |
| 969 } | |
| 970 } | |
| 971 | |
| 972 void G1CollectorPolicy::record_concurrent_pause_end() { | |
| 973 } | |
| 974 | |
| 975 void G1CollectorPolicy::record_collection_pause_end_CH_strong_roots() { | |
| 976 _cur_CH_strong_roots_end_sec = os::elapsedTime(); | |
| 977 _cur_CH_strong_roots_dur_ms = | |
| 978 (_cur_CH_strong_roots_end_sec - _cur_collection_start_sec) * 1000.0; | |
| 979 } | |
| 980 | |
| 981 void G1CollectorPolicy::record_collection_pause_end_G1_strong_roots() { | |
| 982 _cur_G1_strong_roots_end_sec = os::elapsedTime(); | |
| 983 _cur_G1_strong_roots_dur_ms = | |
| 984 (_cur_G1_strong_roots_end_sec - _cur_CH_strong_roots_end_sec) * 1000.0; | |
| 985 } | |
| 986 | |
| 987 template<class T> | |
| 988 T sum_of(T* sum_arr, int start, int n, int N) { | |
| 989 T sum = (T)0; | |
| 990 for (int i = 0; i < n; i++) { | |
| 991 int j = (start + i) % N; | |
| 992 sum += sum_arr[j]; | |
| 993 } | |
| 994 return sum; | |
| 995 } | |
| 996 | |
| 1611 | 997 void G1CollectorPolicy::print_par_stats(int level, |
| 998 const char* str, | |
| 999 double* data, | |
| 342 | 1000 bool summary) { |
| 1001 double min = data[0], max = data[0]; | |
| 1002 double total = 0.0; | |
| 1003 int j; | |
| 1004 for (j = 0; j < level; ++j) | |
| 1005 gclog_or_tty->print(" "); | |
| 1006 gclog_or_tty->print("[%s (ms):", str); | |
| 1007 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1008 double val = data[i]; | |
| 1009 if (val < min) | |
| 1010 min = val; | |
| 1011 if (val > max) | |
| 1012 max = val; | |
| 1013 total += val; | |
| 1014 gclog_or_tty->print(" %3.1lf", val); | |
| 1015 } | |
| 1016 if (summary) { | |
| 1017 gclog_or_tty->print_cr(""); | |
| 1018 double avg = total / (double) ParallelGCThreads; | |
| 1019 gclog_or_tty->print(" "); | |
| 1020 for (j = 0; j < level; ++j) | |
| 1021 gclog_or_tty->print(" "); | |
| 1022 gclog_or_tty->print("Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf", | |
| 1023 avg, min, max); | |
| 1024 } | |
| 1025 gclog_or_tty->print_cr("]"); | |
| 1026 } | |
| 1027 | |
| 1611 | 1028 void G1CollectorPolicy::print_par_sizes(int level, |
| 1029 const char* str, | |
| 1030 double* data, | |
| 1031 bool summary) { | |
| 342 | 1032 double min = data[0], max = data[0]; |
| 1033 double total = 0.0; | |
| 1034 int j; | |
| 1035 for (j = 0; j < level; ++j) | |
| 1036 gclog_or_tty->print(" "); | |
| 1037 gclog_or_tty->print("[%s :", str); | |
| 1038 for (uint i = 0; i < ParallelGCThreads; ++i) { | |
| 1039 double val = data[i]; | |
| 1040 if (val < min) | |
| 1041 min = val; | |
| 1042 if (val > max) | |
| 1043 max = val; | |
| 1044 total += val; | |
| 1045 gclog_or_tty->print(" %d", (int) val); | |
| 1046 } | |
| 1047 if (summary) { | |
| 1048 gclog_or_tty->print_cr(""); | |
| 1049 double avg = total / (double) ParallelGCThreads; | |
| 1050 gclog_or_tty->print(" "); | |
| 1051 for (j = 0; j < level; ++j) | |
| 1052 gclog_or_tty->print(" "); | |
| 1053 gclog_or_tty->print("Sum: %d, Avg: %d, Min: %d, Max: %d", | |
| 1054 (int)total, (int)avg, (int)min, (int)max); | |
| 1055 } | |
| 1056 gclog_or_tty->print_cr("]"); | |
| 1057 } | |
| 1058 | |
| 1059 void G1CollectorPolicy::print_stats (int level, | |
| 1060 const char* str, | |
| 1061 double value) { | |
| 1062 for (int j = 0; j < level; ++j) | |
| 1063 gclog_or_tty->print(" "); | |
| 1064 gclog_or_tty->print_cr("[%s: %5.1lf ms]", str, value); | |
| 1065 } | |
| 1066 | |
| 1067 void G1CollectorPolicy::print_stats (int level, | |
| 1068 const char* str, | |
| 1069 int value) { | |
| 1070 for (int j = 0; j < level; ++j) | |
| 1071 gclog_or_tty->print(" "); | |
| 1072 gclog_or_tty->print_cr("[%s: %d]", str, value); | |
| 1073 } | |
| 1074 | |
| 1075 double G1CollectorPolicy::avg_value (double* data) { | |
| 1076 if (ParallelGCThreads > 0) { | |
| 1077 double ret = 0.0; | |
| 1078 for (uint i = 0; i < ParallelGCThreads; ++i) | |
| 1079 ret += data[i]; | |
| 1080 return ret / (double) ParallelGCThreads; | |
| 1081 } else { | |
| 1082 return data[0]; | |
| 1083 } | |
| 1084 } | |
| 1085 | |
| 1086 double G1CollectorPolicy::max_value (double* data) { | |
| 1087 if (ParallelGCThreads > 0) { | |
| 1088 double ret = data[0]; | |
| 1089 for (uint i = 1; i < ParallelGCThreads; ++i) | |
| 1090 if (data[i] > ret) | |
| 1091 ret = data[i]; | |
| 1092 return ret; | |
| 1093 } else { | |
| 1094 return data[0]; | |
| 1095 } | |
| 1096 } | |
| 1097 | |
| 1098 double G1CollectorPolicy::sum_of_values (double* data) { | |
| 1099 if (ParallelGCThreads > 0) { | |
| 1100 double sum = 0.0; | |
| 1101 for (uint i = 0; i < ParallelGCThreads; i++) | |
| 1102 sum += data[i]; | |
| 1103 return sum; | |
| 1104 } else { | |
| 1105 return data[0]; | |
| 1106 } | |
| 1107 } | |
| 1108 | |
| 1109 double G1CollectorPolicy::max_sum (double* data1, | |
| 1110 double* data2) { | |
| 1111 double ret = data1[0] + data2[0]; | |
| 1112 | |
| 1113 if (ParallelGCThreads > 0) { | |
| 1114 for (uint i = 1; i < ParallelGCThreads; ++i) { | |
| 1115 double data = data1[i] + data2[i]; | |
| 1116 if (data > ret) | |
| 1117 ret = data; | |
| 1118 } | |
| 1119 } | |
| 1120 return ret; | |
| 1121 } | |
| 1122 | |
| 1123 // Anything below that is considered to be zero | |
| 1124 #define MIN_TIMER_GRANULARITY 0.0000001 | |
| 1125 | |
| 1707 | 1126 void G1CollectorPolicy::record_collection_pause_end() { |
| 342 | 1127 double end_time_sec = os::elapsedTime(); |
| 1128 double elapsed_ms = _last_pause_time_ms; | |
| 1129 bool parallel = ParallelGCThreads > 0; | |
| 1130 double evac_ms = (end_time_sec - _cur_G1_strong_roots_end_sec) * 1000.0; | |
| 1131 size_t rs_size = | |
| 1132 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
| 1133 size_t cur_used_bytes = _g1->used(); | |
| 1134 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
| 1135 bool last_pause_included_initial_mark = false; | |
| 1707 | 1136 bool update_stats = !_g1->evacuation_failed(); |
| 342 | 1137 |
| 1138 #ifndef PRODUCT | |
| 1139 if (G1YoungSurvRateVerbose) { | |
| 1140 gclog_or_tty->print_cr(""); | |
| 1141 _short_lived_surv_rate_group->print(); | |
| 1142 // do that for any other surv rate groups too | |
| 1143 } | |
| 1144 #endif // PRODUCT | |
| 1145 | |
| 1146 if (in_young_gc_mode()) { | |
|
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1147 last_pause_included_initial_mark = during_initial_mark_pause(); |
| 342 | 1148 if (last_pause_included_initial_mark) |
| 1149 record_concurrent_mark_init_end_pre(0.0); | |
| 1150 | |
| 1151 size_t min_used_targ = | |
|
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1152 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
| 342 | 1153 |
|
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1154 |
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1155 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
|
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1156 assert(!last_pause_included_initial_mark, "invariant"); |
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1157 if (cur_used_bytes > min_used_targ && |
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1158 cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1159 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1160 |
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1161 // Note: this might have already been set, if during the last |
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1162 // pause we decided to start a cycle but at the beginning of |
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1163 // this pause we decided to postpone it. That's OK. |
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1164 set_initiate_conc_mark_if_possible(); |
| 342 | 1165 } |
| 1166 } | |
| 1167 | |
| 1168 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; | |
| 1169 } | |
| 1170 | |
| 1171 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, | |
| 1172 end_time_sec, false); | |
| 1173 | |
| 1174 guarantee(_cur_collection_pause_used_regions_at_start >= | |
| 1175 collection_set_size(), | |
| 1176 "Negative RS size?"); | |
| 1177 | |
| 1178 // This assert is exempted when we're doing parallel collection pauses, | |
| 1179 // because the fragmentation caused by the parallel GC allocation buffers | |
| 1180 // can lead to more memory being used during collection than was used | |
| 1181 // before. Best leave this out until the fragmentation problem is fixed. | |
| 1182 // Pauses in which evacuation failed can also lead to negative | |
| 1183 // collections, since no space is reclaimed from a region containing an | |
| 1184 // object whose evacuation failed. | |
| 1185 // Further, we're now always doing parallel collection. But I'm still | |
| 1186 // leaving this here as a placeholder for a more precise assertion later. | |
| 1187 // (DLD, 10/05.) | |
| 1188 assert((true || parallel) // Always using GC LABs now. | |
| 1189 || _g1->evacuation_failed() | |
| 1190 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
| 1191 "Negative collection"); | |
| 1192 | |
| 1193 size_t freed_bytes = | |
| 1194 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
| 1195 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
|
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1196 |
| 342 | 1197 double survival_fraction = |
| 1198 (double)surviving_bytes/ | |
| 1199 (double)_collection_set_bytes_used_before; | |
| 1200 | |
| 1201 _n_pauses++; | |
| 1202 | |
|
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1203 if (update_stats) { |
| 342 | 1204 _recent_CH_strong_roots_times_ms->add(_cur_CH_strong_roots_dur_ms); |
| 1205 _recent_G1_strong_roots_times_ms->add(_cur_G1_strong_roots_dur_ms); | |
| 1206 _recent_evac_times_ms->add(evac_ms); | |
| 1207 _recent_pause_times_ms->add(elapsed_ms); | |
| 1208 | |
| 1209 _recent_rs_sizes->add(rs_size); | |
| 1210 | |
| 1211 // We exempt parallel collection from this check because Alloc Buffer | |
| 1212 // fragmentation can produce negative collections. Same with evac | |
| 1213 // failure. | |
| 1214 // Further, we're now always doing parallel collection. But I'm still | |
| 1215 // leaving this here as a placeholder for a more precise assertion later. | |
| 1216 // (DLD, 10/05. | |
| 1217 assert((true || parallel) | |
| 1218 || _g1->evacuation_failed() | |
| 1219 || surviving_bytes <= _collection_set_bytes_used_before, | |
| 1220 "Or else negative collection!"); | |
| 1221 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
| 1222 _recent_CS_bytes_surviving->add(surviving_bytes); | |
| 1223 | |
| 1224 // this is where we update the allocation rate of the application | |
| 1225 double app_time_ms = | |
| 1226 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
| 1227 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
| 1228 // This usually happens due to the timer not having the required | |
| 1229 // granularity. Some Linuxes are the usual culprits. | |
| 1230 // We'll just set it to something (arbitrarily) small. | |
| 1231 app_time_ms = 1.0; | |
| 1232 } | |
| 1233 size_t regions_allocated = | |
| 1234 (_region_num_young - _prev_region_num_young) + | |
| 1235 (_region_num_tenured - _prev_region_num_tenured); | |
| 1236 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
| 1237 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
| 1238 _prev_region_num_young = _region_num_young; | |
| 1239 _prev_region_num_tenured = _region_num_tenured; | |
| 1240 | |
| 1241 double interval_ms = | |
| 1242 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
| 1243 update_recent_gc_times(end_time_sec, elapsed_ms); | |
| 1244 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
|
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1245 if (recent_avg_pause_time_ratio() < 0.0 || |
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1246 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
|
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1247 #ifndef PRODUCT |
|
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1248 // Dump info to allow post-facto debugging |
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1249 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
|
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1250 gclog_or_tty->print_cr("-------------------------------------------"); |
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1251 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1252 _recent_gc_times_ms->dump(); |
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1253 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1254 _recent_prev_end_times_for_all_gcs_sec->dump(); |
|
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1255 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
|
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1256 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
|
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1257 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1258 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
|
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1259 #endif // !PRODUCT |
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1260 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
|
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1261 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
|
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1262 if (_recent_avg_pause_time_ratio < 0.0) { |
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1263 _recent_avg_pause_time_ratio = 0.0; |
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1264 } else { |
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1265 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1266 _recent_avg_pause_time_ratio = 1.0; |
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1267 } |
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1268 } |
| 342 | 1269 } |
| 1270 | |
| 1271 if (G1PolicyVerbose > 1) { | |
| 1272 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
| 1273 } | |
| 1274 | |
| 1707 | 1275 PauseSummary* summary = _summary; |
| 342 | 1276 |
| 1277 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); | |
| 1278 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); | |
| 1279 double update_rs_time = avg_value(_par_last_update_rs_times_ms); | |
| 1280 double update_rs_processed_buffers = | |
| 1281 sum_of_values(_par_last_update_rs_processed_buffers); | |
| 1282 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); | |
| 1283 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); | |
| 1284 double termination_time = avg_value(_par_last_termination_times_ms); | |
| 1285 | |
|
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1286 double parallel_other_time = _cur_collection_par_time_ms - |
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1287 (update_rs_time + ext_root_scan_time + mark_stack_scan_time + |
|
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1288 scan_rs_time + obj_copy_time + termination_time); |
|
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1289 if (update_stats) { |
| 342 | 1290 MainBodySummary* body_summary = summary->main_body_summary(); |
| 1291 guarantee(body_summary != NULL, "should not be null!"); | |
| 1292 | |
| 1293 if (_satb_drain_time_set) | |
| 1294 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
| 1295 else | |
| 1296 body_summary->record_satb_drain_time_ms(0.0); | |
| 1297 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); | |
| 1298 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); | |
| 1299 body_summary->record_update_rs_time_ms(update_rs_time); | |
| 1300 body_summary->record_scan_rs_time_ms(scan_rs_time); | |
| 1301 body_summary->record_obj_copy_time_ms(obj_copy_time); | |
| 1302 if (parallel) { | |
| 1303 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); | |
| 1304 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); | |
| 1305 body_summary->record_termination_time_ms(termination_time); | |
| 1306 body_summary->record_parallel_other_time_ms(parallel_other_time); | |
| 1307 } | |
| 1308 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); | |
| 1309 } | |
| 1310 | |
| 1311 if (G1PolicyVerbose > 1) { | |
| 1312 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
| 1313 " CH Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1314 " G1 Strong: %10.6f ms (avg: %10.6f ms)\n" | |
| 1315 " Evac: %10.6f ms (avg: %10.6f ms)\n" | |
| 1316 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
| 1317 " |RS|: " SIZE_FORMAT, | |
| 1318 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
| 1319 _cur_CH_strong_roots_dur_ms, recent_avg_time_for_CH_strong_ms(), | |
| 1320 _cur_G1_strong_roots_dur_ms, recent_avg_time_for_G1_strong_ms(), | |
| 1321 evac_ms, recent_avg_time_for_evac_ms(), | |
| 1322 scan_rs_time, | |
| 1323 recent_avg_time_for_pauses_ms() - | |
| 1324 recent_avg_time_for_G1_strong_ms(), | |
| 1325 rs_size); | |
| 1326 | |
| 1327 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
| 1328 " At end " SIZE_FORMAT "K\n" | |
| 1329 " garbage : " SIZE_FORMAT "K" | |
| 1330 " of " SIZE_FORMAT "K\n" | |
| 1331 " survival : %6.2f%% (%6.2f%% avg)", | |
| 1332 _cur_collection_pause_used_at_start_bytes/K, | |
| 1333 _g1->used()/K, freed_bytes/K, | |
| 1334 _collection_set_bytes_used_before/K, | |
| 1335 survival_fraction*100.0, | |
| 1336 recent_avg_survival_fraction()*100.0); | |
| 1337 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
| 1338 recent_avg_pause_time_ratio() * 100.0); | |
| 1339 } | |
| 1340 | |
| 1341 double other_time_ms = elapsed_ms; | |
| 1342 | |
| 1707 | 1343 if (_satb_drain_time_set) { |
| 1344 other_time_ms -= _cur_satb_drain_time_ms; | |
| 1345 } | |
| 1346 | |
| 1347 if (parallel) { | |
| 1348 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
| 1349 } else { | |
| 1350 other_time_ms -= | |
| 1351 update_rs_time + | |
| 1352 ext_root_scan_time + mark_stack_scan_time + | |
| 1353 scan_rs_time + obj_copy_time; | |
| 342 | 1354 } |
| 1355 | |
| 1356 if (PrintGCDetails) { | |
| 1707 | 1357 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
| 342 | 1358 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
| 1359 elapsed_ms / 1000.0); | |
| 1360 | |
| 1707 | 1361 if (_satb_drain_time_set) { |
| 1362 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
| 1363 } | |
| 1364 if (_last_satb_drain_processed_buffers >= 0) { | |
| 1365 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
| 1366 } | |
| 1367 if (parallel) { | |
| 1368 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
| 1369 print_par_stats(2, "GC Worker Start Time", | |
| 1370 _par_last_gc_worker_start_times_ms, false); | |
| 1371 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); | |
| 1372 print_par_sizes(3, "Processed Buffers", | |
| 1373 _par_last_update_rs_processed_buffers, true); | |
| 1374 print_par_stats(2, "Ext Root Scanning", | |
| 1375 _par_last_ext_root_scan_times_ms); | |
| 1376 print_par_stats(2, "Mark Stack Scanning", | |
| 1377 _par_last_mark_stack_scan_times_ms); | |
| 1378 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); | |
| 1379 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
| 1380 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
| 1381 print_par_sizes(3, "Termination Attempts", | |
| 1382 _par_last_termination_attempts, true); | |
| 1383 print_par_stats(2, "GC Worker End Time", | |
| 1384 _par_last_gc_worker_end_times_ms, false); | |
| 1385 print_stats(2, "Other", parallel_other_time); | |
| 1386 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); | |
| 1387 } else { | |
| 1388 print_stats(1, "Update RS", update_rs_time); | |
| 1389 print_stats(2, "Processed Buffers", | |
| 1390 (int)update_rs_processed_buffers); | |
| 1391 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
| 1392 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
| 1393 print_stats(1, "Scan RS", scan_rs_time); | |
| 1394 print_stats(1, "Object Copying", obj_copy_time); | |
| 342 | 1395 } |
|
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1396 #ifndef PRODUCT |
|
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1397 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1398 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1399 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1400 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
|
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1401 if (_num_cc_clears > 0) { |
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1402 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1403 } |
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1404 #endif |
| 342 | 1405 print_stats(1, "Other", other_time_ms); |
|
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1406 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
|
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1407 |
| 342 | 1408 for (int i = 0; i < _aux_num; ++i) { |
| 1409 if (_cur_aux_times_set[i]) { | |
| 1410 char buffer[96]; | |
| 1411 sprintf(buffer, "Aux%d", i); | |
| 1412 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
| 1413 } | |
| 1414 } | |
| 1415 } | |
| 1416 if (PrintGCDetails) | |
| 1417 gclog_or_tty->print(" ["); | |
| 1418 if (PrintGC || PrintGCDetails) | |
| 1419 _g1->print_size_transition(gclog_or_tty, | |
| 1420 _cur_collection_pause_used_at_start_bytes, | |
| 1421 _g1->used(), _g1->capacity()); | |
| 1422 if (PrintGCDetails) | |
| 1423 gclog_or_tty->print_cr("]"); | |
| 1424 | |
| 1425 _all_pause_times_ms->add(elapsed_ms); | |
|
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1426 if (update_stats) { |
|
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1427 summary->record_total_time_ms(elapsed_ms); |
|
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1428 summary->record_other_time_ms(other_time_ms); |
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1429 } |
| 342 | 1430 for (int i = 0; i < _aux_num; ++i) |
| 1431 if (_cur_aux_times_set[i]) | |
| 1432 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
| 1433 | |
| 1434 // Reset marks-between-pauses counter. | |
| 1435 _n_marks_since_last_pause = 0; | |
| 1436 | |
| 1437 // Update the efficiency-since-mark vars. | |
| 1438 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
| 1439 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
| 1440 // This usually happens due to the timer not having the required | |
| 1441 // granularity. Some Linuxes are the usual culprits. | |
| 1442 // We'll just set it to something (arbitrarily) small. | |
| 1443 proc_ms = 1.0; | |
| 1444 } | |
| 1445 double cur_efficiency = (double) freed_bytes / proc_ms; | |
| 1446 | |
| 1447 bool new_in_marking_window = _in_marking_window; | |
| 1448 bool new_in_marking_window_im = false; | |
|
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1449 if (during_initial_mark_pause()) { |
| 342 | 1450 new_in_marking_window = true; |
| 1451 new_in_marking_window_im = true; | |
| 1452 } | |
| 1453 | |
| 1454 if (in_young_gc_mode()) { | |
| 1455 if (_last_full_young_gc) { | |
| 1456 set_full_young_gcs(false); | |
| 1457 _last_full_young_gc = false; | |
| 1458 } | |
| 1459 | |
| 1460 if ( !_last_young_gc_full ) { | |
| 1461 if ( _should_revert_to_full_young_gcs || | |
| 1462 _known_garbage_ratio < 0.05 || | |
| 1463 (adaptive_young_list_length() && | |
| 1464 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) ) { | |
| 1465 set_full_young_gcs(true); | |
| 1466 } | |
| 1467 } | |
| 1468 _should_revert_to_full_young_gcs = false; | |
| 1469 | |
| 1470 if (_last_young_gc_full && !_during_marking) | |
| 1471 _young_gc_eff_seq->add(cur_efficiency); | |
| 1472 } | |
| 1473 | |
| 1474 _short_lived_surv_rate_group->start_adding_regions(); | |
| 1475 // do that for any other surv rate groupsx | |
| 1476 | |
| 1477 // <NEW PREDICTION> | |
| 1478 | |
| 677 | 1479 if (update_stats) { |
| 342 | 1480 double pause_time_ms = elapsed_ms; |
| 1481 | |
| 1482 size_t diff = 0; | |
| 1483 if (_max_pending_cards >= _pending_cards) | |
| 1484 diff = _max_pending_cards - _pending_cards; | |
| 1485 _pending_card_diff_seq->add((double) diff); | |
| 1486 | |
| 1487 double cost_per_card_ms = 0.0; | |
| 1488 if (_pending_cards > 0) { | |
| 1489 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
| 1490 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
| 1491 } | |
| 1492 | |
| 1493 size_t cards_scanned = _g1->cards_scanned(); | |
| 1494 | |
| 1495 double cost_per_entry_ms = 0.0; | |
| 1496 if (cards_scanned > 10) { | |
| 1497 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
| 1498 if (_last_young_gc_full) | |
| 1499 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1500 else | |
| 1501 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
| 1502 } | |
| 1503 | |
| 1504 if (_max_rs_lengths > 0) { | |
| 1505 double cards_per_entry_ratio = | |
| 1506 (double) cards_scanned / (double) _max_rs_lengths; | |
| 1507 if (_last_young_gc_full) | |
| 1508 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1509 else | |
| 1510 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
| 1511 } | |
| 1512 | |
| 1513 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
| 1514 if (rs_length_diff >= 0) | |
| 1515 _rs_length_diff_seq->add((double) rs_length_diff); | |
| 1516 | |
| 1517 size_t copied_bytes = surviving_bytes; | |
| 1518 double cost_per_byte_ms = 0.0; | |
| 1519 if (copied_bytes > 0) { | |
| 1520 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
| 1521 if (_in_marking_window) | |
| 1522 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
| 1523 else | |
| 1524 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
| 1525 } | |
| 1526 | |
| 1527 double all_other_time_ms = pause_time_ms - | |
|
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1528 (update_rs_time + scan_rs_time + obj_copy_time + |
| 342 | 1529 _mark_closure_time_ms + termination_time); |
| 1530 | |
| 1531 double young_other_time_ms = 0.0; | |
| 1532 if (_recorded_young_regions > 0) { | |
| 1533 young_other_time_ms = | |
| 1534 _recorded_young_cset_choice_time_ms + | |
| 1535 _recorded_young_free_cset_time_ms; | |
| 1536 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
| 1537 (double) _recorded_young_regions); | |
| 1538 } | |
| 1539 double non_young_other_time_ms = 0.0; | |
| 1540 if (_recorded_non_young_regions > 0) { | |
| 1541 non_young_other_time_ms = | |
| 1542 _recorded_non_young_cset_choice_time_ms + | |
| 1543 _recorded_non_young_free_cset_time_ms; | |
| 1544 | |
| 1545 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
| 1546 (double) _recorded_non_young_regions); | |
| 1547 } | |
| 1548 | |
| 1549 double constant_other_time_ms = all_other_time_ms - | |
| 1550 (young_other_time_ms + non_young_other_time_ms); | |
| 1551 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
| 1552 | |
| 1553 double survival_ratio = 0.0; | |
| 1554 if (_bytes_in_collection_set_before_gc > 0) { | |
| 1555 survival_ratio = (double) bytes_in_to_space_during_gc() / | |
| 1556 (double) _bytes_in_collection_set_before_gc; | |
| 1557 } | |
| 1558 | |
| 1559 _pending_cards_seq->add((double) _pending_cards); | |
| 1560 _scanned_cards_seq->add((double) cards_scanned); | |
| 1561 _rs_lengths_seq->add((double) _max_rs_lengths); | |
| 1562 | |
| 1563 double expensive_region_limit_ms = | |
| 751 | 1564 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
| 342 | 1565 if (expensive_region_limit_ms < 0.0) { |
| 1566 // this means that the other time was predicted to be longer than | |
| 1567 // than the max pause time | |
| 751 | 1568 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
| 342 | 1569 } |
| 1570 _expensive_region_limit_ms = expensive_region_limit_ms; | |
| 1571 | |
| 1572 if (PREDICTIONS_VERBOSE) { | |
| 1573 gclog_or_tty->print_cr(""); | |
| 1574 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
|
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1575 "REGIONS %d %d %d " |
| 342 | 1576 "PENDING_CARDS %d %d " |
| 1577 "CARDS_SCANNED %d %d " | |
| 1578 "RS_LENGTHS %d %d " | |
| 1579 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
| 1580 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
| 1581 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
| 1582 "OTHER_YOUNG %1.6lf %1.6lf " | |
| 1583 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
| 1584 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
| 1585 "ELAPSED %1.6lf %1.6lf ", | |
| 1586 _cur_collection_start_sec, | |
| 1587 (!_last_young_gc_full) ? 2 : | |
| 1588 (last_pause_included_initial_mark) ? 1 : 0, | |
| 1589 _recorded_region_num, | |
| 1590 _recorded_young_regions, | |
| 1591 _recorded_non_young_regions, | |
| 1592 _predicted_pending_cards, _pending_cards, | |
| 1593 _predicted_cards_scanned, cards_scanned, | |
| 1594 _predicted_rs_lengths, _max_rs_lengths, | |
| 1595 _predicted_rs_update_time_ms, update_rs_time, | |
| 1596 _predicted_rs_scan_time_ms, scan_rs_time, | |
| 1597 _predicted_survival_ratio, survival_ratio, | |
| 1598 _predicted_object_copy_time_ms, obj_copy_time, | |
| 1599 _predicted_constant_other_time_ms, constant_other_time_ms, | |
| 1600 _predicted_young_other_time_ms, young_other_time_ms, | |
| 1601 _predicted_non_young_other_time_ms, | |
| 1602 non_young_other_time_ms, | |
| 1603 _vtime_diff_ms, termination_time, | |
| 1604 _predicted_pause_time_ms, elapsed_ms); | |
| 1605 } | |
| 1606 | |
| 1607 if (G1PolicyVerbose > 0) { | |
| 1608 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
| 1609 _predicted_pause_time_ms, | |
| 1610 (_within_target) ? "within" : "outside", | |
| 1611 elapsed_ms); | |
| 1612 } | |
| 1613 | |
| 1614 } | |
| 1615 | |
| 1616 _in_marking_window = new_in_marking_window; | |
| 1617 _in_marking_window_im = new_in_marking_window_im; | |
| 1618 _free_regions_at_end_of_collection = _g1->free_regions(); | |
| 1619 calculate_young_list_min_length(); | |
|
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1620 calculate_young_list_target_length(); |
| 342 | 1621 |
| 1111 | 1622 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
| 1282 | 1623 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
| 1111 | 1624 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
| 342 | 1625 // </NEW PREDICTION> |
| 1626 } | |
| 1627 | |
| 1628 // <NEW PREDICTION> | |
| 1629 | |
| 1111 | 1630 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
| 1631 double update_rs_processed_buffers, | |
| 1632 double goal_ms) { | |
| 1633 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
| 1634 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
| 1635 | |
| 1282 | 1636 if (G1UseAdaptiveConcRefinement) { |
| 1111 | 1637 const int k_gy = 3, k_gr = 6; |
| 1638 const double inc_k = 1.1, dec_k = 0.9; | |
| 1639 | |
| 1640 int g = cg1r->green_zone(); | |
| 1641 if (update_rs_time > goal_ms) { | |
| 1642 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
| 1643 } else { | |
| 1644 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
| 1645 g = (int)MAX2(g * inc_k, g + 1.0); | |
| 1646 } | |
| 1647 } | |
| 1648 // Change the refinement threads params | |
| 1649 cg1r->set_green_zone(g); | |
| 1650 cg1r->set_yellow_zone(g * k_gy); | |
| 1651 cg1r->set_red_zone(g * k_gr); | |
| 1652 cg1r->reinitialize_threads(); | |
| 1653 | |
| 1654 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
| 1655 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
| 1656 cg1r->yellow_zone()); | |
| 1657 // Change the barrier params | |
| 1658 dcqs.set_process_completed_threshold(processing_threshold); | |
| 1659 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
| 1660 } | |
| 1661 | |
| 1662 int curr_queue_size = dcqs.completed_buffers_num(); | |
| 1663 if (curr_queue_size >= cg1r->yellow_zone()) { | |
| 1664 dcqs.set_completed_queue_padding(curr_queue_size); | |
| 1665 } else { | |
| 1666 dcqs.set_completed_queue_padding(0); | |
| 1667 } | |
| 1668 dcqs.notify_if_necessary(); | |
| 1669 } | |
| 1670 | |
| 342 | 1671 double |
| 1672 G1CollectorPolicy:: | |
| 1673 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
| 1674 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
| 1675 | |
| 1676 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
|
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1677 size_t young_num = g1h->young_list()->length(); |
| 342 | 1678 if (young_num == 0) |
| 1679 return 0.0; | |
| 1680 | |
| 1681 young_num += adjustment; | |
| 1682 size_t pending_cards = predict_pending_cards(); | |
|
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1683 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
| 342 | 1684 predict_rs_length_diff(); |
| 1685 size_t card_num; | |
| 1686 if (full_young_gcs()) | |
| 1687 card_num = predict_young_card_num(rs_lengths); | |
| 1688 else | |
| 1689 card_num = predict_non_young_card_num(rs_lengths); | |
| 1690 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
| 1691 double accum_yg_surv_rate = | |
| 1692 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
| 1693 | |
| 1694 size_t bytes_to_copy = | |
| 1695 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
| 1696 | |
| 1697 return | |
| 1698 predict_rs_update_time_ms(pending_cards) + | |
| 1699 predict_rs_scan_time_ms(card_num) + | |
| 1700 predict_object_copy_time_ms(bytes_to_copy) + | |
| 1701 predict_young_other_time_ms(young_num) + | |
| 1702 predict_constant_other_time_ms(); | |
| 1703 } | |
| 1704 | |
| 1705 double | |
| 1706 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
| 1707 size_t rs_length = predict_rs_length_diff(); | |
| 1708 size_t card_num; | |
| 1709 if (full_young_gcs()) | |
| 1710 card_num = predict_young_card_num(rs_length); | |
| 1711 else | |
| 1712 card_num = predict_non_young_card_num(rs_length); | |
| 1713 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
| 1714 } | |
| 1715 | |
| 1716 double | |
| 1717 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
| 1718 size_t scanned_cards) { | |
| 1719 return | |
| 1720 predict_rs_update_time_ms(pending_cards) + | |
| 1721 predict_rs_scan_time_ms(scanned_cards) + | |
| 1722 predict_constant_other_time_ms(); | |
| 1723 } | |
| 1724 | |
| 1725 double | |
| 1726 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
| 1727 bool young) { | |
| 1728 size_t rs_length = hr->rem_set()->occupied(); | |
| 1729 size_t card_num; | |
| 1730 if (full_young_gcs()) | |
| 1731 card_num = predict_young_card_num(rs_length); | |
| 1732 else | |
| 1733 card_num = predict_non_young_card_num(rs_length); | |
| 1734 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
| 1735 | |
| 1736 double region_elapsed_time_ms = | |
| 1737 predict_rs_scan_time_ms(card_num) + | |
| 1738 predict_object_copy_time_ms(bytes_to_copy); | |
| 1739 | |
| 1740 if (young) | |
| 1741 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
| 1742 else | |
| 1743 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
| 1744 | |
| 1745 return region_elapsed_time_ms; | |
| 1746 } | |
| 1747 | |
| 1748 size_t | |
| 1749 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
| 1750 size_t bytes_to_copy; | |
| 1751 if (hr->is_marked()) | |
| 1752 bytes_to_copy = hr->max_live_bytes(); | |
| 1753 else { | |
| 1754 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
| 1755 "invariant" ); | |
| 1756 int age = hr->age_in_surv_rate_group(); | |
| 545 | 1757 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
| 342 | 1758 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
| 1759 } | |
| 1760 | |
| 1761 return bytes_to_copy; | |
| 1762 } | |
| 1763 | |
| 1764 void | |
| 1765 G1CollectorPolicy::start_recording_regions() { | |
| 1766 _recorded_rs_lengths = 0; | |
| 1767 _recorded_young_regions = 0; | |
| 1768 _recorded_non_young_regions = 0; | |
| 1769 | |
| 1770 #if PREDICTIONS_VERBOSE | |
| 1771 _recorded_marked_bytes = 0; | |
| 1772 _recorded_young_bytes = 0; | |
| 1773 _predicted_bytes_to_copy = 0; | |
|
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1774 _predicted_rs_lengths = 0; |
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1775 _predicted_cards_scanned = 0; |
| 342 | 1776 #endif // PREDICTIONS_VERBOSE |
| 1777 } | |
| 1778 | |
| 1779 void | |
|
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1780 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
| 342 | 1781 #if PREDICTIONS_VERBOSE |
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1782 if (!young) { |
| 342 | 1783 _recorded_marked_bytes += hr->max_live_bytes(); |
| 1784 } | |
| 1785 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
| 1786 #endif // PREDICTIONS_VERBOSE | |
| 1787 | |
| 1788 size_t rs_length = hr->rem_set()->occupied(); | |
| 1789 _recorded_rs_lengths += rs_length; | |
| 1790 } | |
| 1791 | |
| 1792 void | |
|
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1793 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1794 assert(!hr->is_young(), "should not call this"); |
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1795 ++_recorded_non_young_regions; |
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1796 record_cset_region_info(hr, false); |
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1797 } |
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1798 |
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1799 void |
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1800 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1801 _recorded_young_regions = n_regions; |
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1802 } |
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1803 |
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1804 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1805 #if PREDICTIONS_VERBOSE |
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1806 _recorded_young_bytes = bytes; |
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1807 #endif // PREDICTIONS_VERBOSE |
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1808 } |
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1809 |
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1810 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1811 _recorded_rs_lengths = rs_lengths; |
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1812 } |
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1813 |
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1814 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1815 _predicted_bytes_to_copy = bytes; |
| 342 | 1816 } |
| 1817 | |
| 1818 void | |
| 1819 G1CollectorPolicy::end_recording_regions() { | |
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1820 // The _predicted_pause_time_ms field is referenced in code |
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1821 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1822 _predicted_pause_time_ms = -1.0; |
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1823 |
| 342 | 1824 #if PREDICTIONS_VERBOSE |
| 1825 _predicted_pending_cards = predict_pending_cards(); | |
| 1826 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
| 1827 if (full_young_gcs()) | |
| 1828 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
| 1829 else | |
| 1830 _predicted_cards_scanned += | |
| 1831 predict_non_young_card_num(_predicted_rs_lengths); | |
| 1832 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
| 1833 | |
| 1834 _predicted_rs_update_time_ms = | |
| 1835 predict_rs_update_time_ms(_g1->pending_card_num()); | |
| 1836 _predicted_rs_scan_time_ms = | |
| 1837 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
| 1838 _predicted_object_copy_time_ms = | |
| 1839 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
| 1840 _predicted_constant_other_time_ms = | |
| 1841 predict_constant_other_time_ms(); | |
| 1842 _predicted_young_other_time_ms = | |
| 1843 predict_young_other_time_ms(_recorded_young_regions); | |
| 1844 _predicted_non_young_other_time_ms = | |
| 1845 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
| 1846 | |
| 1847 _predicted_pause_time_ms = | |
| 1848 _predicted_rs_update_time_ms + | |
| 1849 _predicted_rs_scan_time_ms + | |
| 1850 _predicted_object_copy_time_ms + | |
| 1851 _predicted_constant_other_time_ms + | |
| 1852 _predicted_young_other_time_ms + | |
| 1853 _predicted_non_young_other_time_ms; | |
| 1854 #endif // PREDICTIONS_VERBOSE | |
| 1855 } | |
| 1856 | |
| 1857 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
| 1858 predicted_time_ms) { | |
| 1859 // I don't think we need to do this when in young GC mode since | |
| 1860 // marking will be initiated next time we hit the soft limit anyway... | |
| 1861 if (predicted_time_ms > _expensive_region_limit_ms) { | |
| 1862 if (!in_young_gc_mode()) { | |
| 1863 set_full_young_gcs(true); | |
|
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1864 // We might want to do something different here. However, |
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1865 // right now we don't support the non-generational G1 mode |
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1866 // (and in fact we are planning to remove the associated code, |
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1867 // see CR 6814390). So, let's leave it as is and this will be |
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1868 // removed some time in the future |
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1869 ShouldNotReachHere(); |
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1870 set_during_initial_mark_pause(); |
| 342 | 1871 } else |
| 1872 // no point in doing another partial one | |
| 1873 _should_revert_to_full_young_gcs = true; | |
| 1874 } | |
| 1875 } | |
| 1876 | |
| 1877 // </NEW PREDICTION> | |
| 1878 | |
| 1879 | |
| 1880 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
| 1881 double elapsed_ms) { | |
| 1882 _recent_gc_times_ms->add(elapsed_ms); | |
| 1883 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
| 1884 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
| 1885 } | |
| 1886 | |
| 1887 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
| 751 | 1888 if (_recent_pause_times_ms->num() == 0) return (double) MaxGCPauseMillis; |
| 342 | 1889 else return _recent_pause_times_ms->avg(); |
| 1890 } | |
| 1891 | |
| 1892 double G1CollectorPolicy::recent_avg_time_for_CH_strong_ms() { | |
| 1893 if (_recent_CH_strong_roots_times_ms->num() == 0) | |
| 751 | 1894 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1895 else return _recent_CH_strong_roots_times_ms->avg(); |
| 1896 } | |
| 1897 | |
| 1898 double G1CollectorPolicy::recent_avg_time_for_G1_strong_ms() { | |
| 1899 if (_recent_G1_strong_roots_times_ms->num() == 0) | |
| 751 | 1900 return (double)MaxGCPauseMillis/3.0; |
| 342 | 1901 else return _recent_G1_strong_roots_times_ms->avg(); |
| 1902 } | |
| 1903 | |
| 1904 double G1CollectorPolicy::recent_avg_time_for_evac_ms() { | |
| 751 | 1905 if (_recent_evac_times_ms->num() == 0) return (double)MaxGCPauseMillis/3.0; |
| 342 | 1906 else return _recent_evac_times_ms->avg(); |
| 1907 } | |
| 1908 | |
| 1909 int G1CollectorPolicy::number_of_recent_gcs() { | |
| 1910 assert(_recent_CH_strong_roots_times_ms->num() == | |
| 1911 _recent_G1_strong_roots_times_ms->num(), "Sequence out of sync"); | |
| 1912 assert(_recent_G1_strong_roots_times_ms->num() == | |
| 1913 _recent_evac_times_ms->num(), "Sequence out of sync"); | |
| 1914 assert(_recent_evac_times_ms->num() == | |
| 1915 _recent_pause_times_ms->num(), "Sequence out of sync"); | |
| 1916 assert(_recent_pause_times_ms->num() == | |
| 1917 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
| 1918 assert(_recent_CS_bytes_used_before->num() == | |
| 1919 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
| 1920 return _recent_pause_times_ms->num(); | |
| 1921 } | |
| 1922 | |
| 1923 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
| 1924 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1925 _recent_CS_bytes_used_before); | |
| 1926 } | |
| 1927 | |
| 1928 double G1CollectorPolicy::last_survival_fraction() { | |
| 1929 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
| 1930 _recent_CS_bytes_used_before); | |
| 1931 } | |
| 1932 | |
| 1933 double | |
| 1934 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
| 1935 TruncatedSeq* before) { | |
| 1936 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1937 if (before->sum() > 0.0) { | |
| 1938 double recent_survival_rate = surviving->sum() / before->sum(); | |
| 1939 // We exempt parallel collection from this check because Alloc Buffer | |
| 1940 // fragmentation can produce negative collections. | |
| 1941 // Further, we're now always doing parallel collection. But I'm still | |
| 1942 // leaving this here as a placeholder for a more precise assertion later. | |
| 1943 // (DLD, 10/05.) | |
| 1944 assert((true || ParallelGCThreads > 0) || | |
| 1945 _g1->evacuation_failed() || | |
| 1946 recent_survival_rate <= 1.0, "Or bad frac"); | |
| 1947 return recent_survival_rate; | |
| 1948 } else { | |
| 1949 return 1.0; // Be conservative. | |
| 1950 } | |
| 1951 } | |
| 1952 | |
| 1953 double | |
| 1954 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
| 1955 TruncatedSeq* before) { | |
| 1956 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
| 1957 if (surviving->num() > 0 && before->last() > 0.0) { | |
| 1958 double last_survival_rate = surviving->last() / before->last(); | |
| 1959 // We exempt parallel collection from this check because Alloc Buffer | |
| 1960 // fragmentation can produce negative collections. | |
| 1961 // Further, we're now always doing parallel collection. But I'm still | |
| 1962 // leaving this here as a placeholder for a more precise assertion later. | |
| 1963 // (DLD, 10/05.) | |
| 1964 assert((true || ParallelGCThreads > 0) || | |
| 1965 last_survival_rate <= 1.0, "Or bad frac"); | |
| 1966 return last_survival_rate; | |
| 1967 } else { | |
| 1968 return 1.0; | |
| 1969 } | |
| 1970 } | |
| 1971 | |
| 1972 static const int survival_min_obs = 5; | |
| 1973 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
| 1974 static const double min_survival_rate = 0.1; | |
| 1975 | |
| 1976 double | |
| 1977 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
| 1978 double latest) { | |
| 1979 double res = avg; | |
| 1980 if (number_of_recent_gcs() < survival_min_obs) { | |
| 1981 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
| 1982 } | |
| 1983 res = MAX2(res, latest); | |
| 1984 res = MAX2(res, min_survival_rate); | |
| 1985 // In the parallel case, LAB fragmentation can produce "negative | |
| 1986 // collections"; so can evac failure. Cap at 1.0 | |
| 1987 res = MIN2(res, 1.0); | |
| 1988 return res; | |
| 1989 } | |
| 1990 | |
| 1991 size_t G1CollectorPolicy::expansion_amount() { | |
| 1356 | 1992 if ((recent_avg_pause_time_ratio() * 100.0) > _gc_overhead_perc) { |
| 751 | 1993 // We will double the existing space, or take |
| 1994 // G1ExpandByPercentOfAvailable % of the available expansion | |
| 1995 // space, whichever is smaller, bounded below by a minimum | |
| 1996 // expansion (unless that's all that's left.) | |
| 342 | 1997 const size_t min_expand_bytes = 1*M; |
| 1998 size_t reserved_bytes = _g1->g1_reserved_obj_bytes(); | |
| 1999 size_t committed_bytes = _g1->capacity(); | |
| 2000 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
| 2001 size_t expand_bytes; | |
| 2002 size_t expand_bytes_via_pct = | |
| 751 | 2003 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
| 342 | 2004 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
| 2005 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
| 2006 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
| 2007 if (G1PolicyVerbose > 1) { | |
| 2008 gclog_or_tty->print("Decided to expand: ratio = %5.2f, " | |
| 2009 "committed = %d%s, uncommited = %d%s, via pct = %d%s.\n" | |
| 2010 " Answer = %d.\n", | |
| 2011 recent_avg_pause_time_ratio(), | |
| 2012 byte_size_in_proper_unit(committed_bytes), | |
| 2013 proper_unit_for_byte_size(committed_bytes), | |
| 2014 byte_size_in_proper_unit(uncommitted_bytes), | |
| 2015 proper_unit_for_byte_size(uncommitted_bytes), | |
| 2016 byte_size_in_proper_unit(expand_bytes_via_pct), | |
| 2017 proper_unit_for_byte_size(expand_bytes_via_pct), | |
| 2018 byte_size_in_proper_unit(expand_bytes), | |
| 2019 proper_unit_for_byte_size(expand_bytes)); | |
| 2020 } | |
| 2021 return expand_bytes; | |
| 2022 } else { | |
| 2023 return 0; | |
| 2024 } | |
| 2025 } | |
| 2026 | |
| 2027 void G1CollectorPolicy::note_start_of_mark_thread() { | |
| 2028 _mark_thread_startup_sec = os::elapsedTime(); | |
| 2029 } | |
| 2030 | |
| 2031 class CountCSClosure: public HeapRegionClosure { | |
| 2032 G1CollectorPolicy* _g1_policy; | |
| 2033 public: | |
| 2034 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
| 2035 _g1_policy(g1_policy) {} | |
| 2036 bool doHeapRegion(HeapRegion* r) { | |
| 2037 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
| 2038 return false; | |
| 2039 } | |
| 2040 }; | |
| 2041 | |
| 2042 void G1CollectorPolicy::count_CS_bytes_used() { | |
| 2043 CountCSClosure cs_closure(this); | |
| 2044 _g1->collection_set_iterate(&cs_closure); | |
| 2045 } | |
| 2046 | |
| 2047 static void print_indent(int level) { | |
| 2048 for (int j = 0; j < level+1; ++j) | |
| 2049 gclog_or_tty->print(" "); | |
| 2050 } | |
| 2051 | |
| 2052 void G1CollectorPolicy::print_summary (int level, | |
| 2053 const char* str, | |
| 2054 NumberSeq* seq) const { | |
| 2055 double sum = seq->sum(); | |
| 2056 print_indent(level); | |
| 2057 gclog_or_tty->print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", | |
| 2058 str, sum / 1000.0, seq->avg()); | |
| 2059 } | |
| 2060 | |
| 2061 void G1CollectorPolicy::print_summary_sd (int level, | |
| 2062 const char* str, | |
| 2063 NumberSeq* seq) const { | |
| 2064 print_summary(level, str, seq); | |
| 2065 print_indent(level + 5); | |
| 2066 gclog_or_tty->print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", | |
| 2067 seq->num(), seq->sd(), seq->maximum()); | |
| 2068 } | |
| 2069 | |
| 2070 void G1CollectorPolicy::check_other_times(int level, | |
| 2071 NumberSeq* other_times_ms, | |
| 2072 NumberSeq* calc_other_times_ms) const { | |
| 2073 bool should_print = false; | |
| 2074 | |
| 2075 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
| 2076 fabs(calc_other_times_ms->sum())); | |
| 2077 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
| 2078 fabs(calc_other_times_ms->sum())); | |
| 2079 double sum_ratio = max_sum / min_sum; | |
| 2080 if (sum_ratio > 1.1) { | |
| 2081 should_print = true; | |
| 2082 print_indent(level + 1); | |
| 2083 gclog_or_tty->print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); | |
| 2084 } | |
| 2085 | |
| 2086 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
| 2087 fabs(calc_other_times_ms->avg())); | |
| 2088 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
| 2089 fabs(calc_other_times_ms->avg())); | |
| 2090 double avg_ratio = max_avg / min_avg; | |
| 2091 if (avg_ratio > 1.1) { | |
| 2092 should_print = true; | |
| 2093 print_indent(level + 1); | |
| 2094 gclog_or_tty->print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); | |
| 2095 } | |
| 2096 | |
| 2097 if (other_times_ms->sum() < -0.01) { | |
| 2098 print_indent(level + 1); | |
| 2099 gclog_or_tty->print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); | |
| 2100 } | |
| 2101 | |
| 2102 if (other_times_ms->avg() < -0.01) { | |
| 2103 print_indent(level + 1); | |
| 2104 gclog_or_tty->print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); | |
| 2105 } | |
| 2106 | |
| 2107 if (calc_other_times_ms->sum() < -0.01) { | |
| 2108 should_print = true; | |
| 2109 print_indent(level + 1); | |
| 2110 gclog_or_tty->print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); | |
| 2111 } | |
| 2112 | |
| 2113 if (calc_other_times_ms->avg() < -0.01) { | |
| 2114 should_print = true; | |
| 2115 print_indent(level + 1); | |
| 2116 gclog_or_tty->print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); | |
| 2117 } | |
| 2118 | |
| 2119 if (should_print) | |
| 2120 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
| 2121 } | |
| 2122 | |
| 2123 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
| 2124 bool parallel = ParallelGCThreads > 0; | |
| 2125 MainBodySummary* body_summary = summary->main_body_summary(); | |
| 2126 if (summary->get_total_seq()->num() > 0) { | |
| 677 | 2127 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
| 342 | 2128 if (body_summary != NULL) { |
| 2129 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
| 2130 if (parallel) { | |
| 2131 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
| 2132 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
| 2133 print_summary(2, "Ext Root Scanning", | |
| 2134 body_summary->get_ext_root_scan_seq()); | |
| 2135 print_summary(2, "Mark Stack Scanning", | |
| 2136 body_summary->get_mark_stack_scan_seq()); | |
| 2137 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2138 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2139 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
| 2140 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
| 2141 { | |
| 2142 NumberSeq* other_parts[] = { | |
| 2143 body_summary->get_update_rs_seq(), | |
| 2144 body_summary->get_ext_root_scan_seq(), | |
| 2145 body_summary->get_mark_stack_scan_seq(), | |
| 2146 body_summary->get_scan_rs_seq(), | |
| 2147 body_summary->get_obj_copy_seq(), | |
| 2148 body_summary->get_termination_seq() | |
| 2149 }; | |
| 2150 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
| 2151 7, other_parts); | |
| 2152 check_other_times(2, body_summary->get_parallel_other_seq(), | |
| 2153 &calc_other_times_ms); | |
| 2154 } | |
| 2155 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
| 2156 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
| 2157 } else { | |
| 2158 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
| 2159 print_summary(1, "Ext Root Scanning", | |
| 2160 body_summary->get_ext_root_scan_seq()); | |
| 2161 print_summary(1, "Mark Stack Scanning", | |
| 2162 body_summary->get_mark_stack_scan_seq()); | |
| 2163 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
| 2164 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
| 2165 } | |
| 2166 } | |
| 2167 print_summary(1, "Other", summary->get_other_seq()); | |
| 2168 { | |
| 2169 NumberSeq calc_other_times_ms; | |
| 1707 | 2170 if (parallel) { |
| 2171 // parallel | |
| 2172 NumberSeq* other_parts[] = { | |
| 2173 body_summary->get_satb_drain_seq(), | |
| 2174 body_summary->get_parallel_seq(), | |
| 2175 body_summary->get_clear_ct_seq() | |
| 2176 }; | |
| 2177 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2178 3, other_parts); | |
| 342 | 2179 } else { |
| 1707 | 2180 // serial |
| 2181 NumberSeq* other_parts[] = { | |
| 2182 body_summary->get_satb_drain_seq(), | |
| 2183 body_summary->get_update_rs_seq(), | |
| 2184 body_summary->get_ext_root_scan_seq(), | |
| 2185 body_summary->get_mark_stack_scan_seq(), | |
| 2186 body_summary->get_scan_rs_seq(), | |
| 2187 body_summary->get_obj_copy_seq() | |
| 2188 }; | |
| 2189 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
| 2190 7, other_parts); | |
| 342 | 2191 } |
| 2192 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
| 2193 } | |
| 2194 } else { | |
| 2195 print_indent(0); | |
| 2196 gclog_or_tty->print_cr("none"); | |
| 2197 } | |
| 2198 gclog_or_tty->print_cr(""); | |
| 2199 } | |
| 2200 | |
| 2201 void G1CollectorPolicy::print_tracing_info() const { | |
| 2202 if (TraceGen0Time) { | |
| 2203 gclog_or_tty->print_cr("ALL PAUSES"); | |
| 2204 print_summary_sd(0, "Total", _all_pause_times_ms); | |
| 2205 gclog_or_tty->print_cr(""); | |
| 2206 gclog_or_tty->print_cr(""); | |
| 2207 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
| 2208 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
| 2209 gclog_or_tty->print_cr(""); | |
| 2210 | |
| 677 | 2211 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
| 2212 print_summary(_summary); | |
| 342 | 2213 |
| 2214 gclog_or_tty->print_cr("MISC"); | |
| 2215 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
| 2216 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
| 2217 for (int i = 0; i < _aux_num; ++i) { | |
| 2218 if (_all_aux_times_ms[i].num() > 0) { | |
| 2219 char buffer[96]; | |
| 2220 sprintf(buffer, "Aux%d", i); | |
| 2221 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
| 2222 } | |
| 2223 } | |
| 2224 | |
| 2225 size_t all_region_num = _region_num_young + _region_num_tenured; | |
| 2226 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
| 2227 "Tenured %8d (%6.2lf%%)", | |
| 2228 all_region_num, | |
| 2229 _region_num_young, | |
| 2230 (double) _region_num_young / (double) all_region_num * 100.0, | |
| 2231 _region_num_tenured, | |
| 2232 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
| 2233 } | |
| 2234 if (TraceGen1Time) { | |
| 2235 if (_all_full_gc_times_ms->num() > 0) { | |
| 2236 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
| 2237 _all_full_gc_times_ms->num(), | |
| 2238 _all_full_gc_times_ms->sum() / 1000.0); | |
| 2239 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
| 2240 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
| 2241 _all_full_gc_times_ms->sd(), | |
| 2242 _all_full_gc_times_ms->maximum()); | |
| 2243 } | |
| 2244 } | |
| 2245 } | |
| 2246 | |
| 2247 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
| 2248 #ifndef PRODUCT | |
| 2249 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
| 2250 // add this call for any other surv rate groups | |
| 2251 #endif // PRODUCT | |
| 2252 } | |
| 2253 | |
| 2254 bool | |
| 2255 G1CollectorPolicy::should_add_next_region_to_young_list() { | |
| 2256 assert(in_young_gc_mode(), "should be in young GC mode"); | |
| 2257 bool ret; | |
|
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2258 size_t young_list_length = _g1->young_list()->length(); |
| 545 | 2259 size_t young_list_max_length = _young_list_target_length; |
| 2260 if (G1FixedEdenSize) { | |
| 2261 young_list_max_length -= _max_survivor_regions; | |
| 2262 } | |
| 2263 if (young_list_length < young_list_max_length) { | |
| 342 | 2264 ret = true; |
| 2265 ++_region_num_young; | |
| 2266 } else { | |
| 2267 ret = false; | |
| 2268 ++_region_num_tenured; | |
| 2269 } | |
| 2270 | |
| 2271 return ret; | |
| 2272 } | |
| 2273 | |
| 2274 #ifndef PRODUCT | |
| 2275 // for debugging, bit of a hack... | |
| 2276 static char* | |
| 2277 region_num_to_mbs(int length) { | |
| 2278 static char buffer[64]; | |
| 2279 double bytes = (double) (length * HeapRegion::GrainBytes); | |
| 2280 double mbs = bytes / (double) (1024 * 1024); | |
| 2281 sprintf(buffer, "%7.2lfMB", mbs); | |
| 2282 return buffer; | |
| 2283 } | |
| 2284 #endif // PRODUCT | |
| 2285 | |
| 545 | 2286 size_t G1CollectorPolicy::max_regions(int purpose) { |
| 342 | 2287 switch (purpose) { |
| 2288 case GCAllocForSurvived: | |
| 545 | 2289 return _max_survivor_regions; |
| 342 | 2290 case GCAllocForTenured: |
| 545 | 2291 return REGIONS_UNLIMITED; |
| 342 | 2292 default: |
| 545 | 2293 ShouldNotReachHere(); |
| 2294 return REGIONS_UNLIMITED; | |
| 342 | 2295 }; |
| 2296 } | |
| 2297 | |
| 545 | 2298 // Calculates survivor space parameters. |
| 2299 void G1CollectorPolicy::calculate_survivors_policy() | |
| 2300 { | |
| 2301 if (G1FixedSurvivorSpaceSize == 0) { | |
| 2302 _max_survivor_regions = _young_list_target_length / SurvivorRatio; | |
| 2303 } else { | |
|
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2304 _max_survivor_regions = G1FixedSurvivorSpaceSize / HeapRegion::GrainBytes; |
| 545 | 2305 } |
| 2306 | |
| 2307 if (G1FixedTenuringThreshold) { | |
| 2308 _tenuring_threshold = MaxTenuringThreshold; | |
| 2309 } else { | |
| 2310 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( | |
| 2311 HeapRegion::GrainWords * _max_survivor_regions); | |
| 2312 } | |
| 2313 } | |
| 2314 | |
| 342 | 2315 bool |
| 2316 G1CollectorPolicy_BestRegionsFirst::should_do_collection_pause(size_t | |
| 2317 word_size) { | |
| 2318 assert(_g1->regions_accounted_for(), "Region leakage!"); | |
| 2319 double max_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; | |
| 2320 | |
|
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2321 size_t young_list_length = _g1->young_list()->length(); |
| 545 | 2322 size_t young_list_max_length = _young_list_target_length; |
| 2323 if (G1FixedEdenSize) { | |
| 2324 young_list_max_length -= _max_survivor_regions; | |
| 2325 } | |
| 2326 bool reached_target_length = young_list_length >= young_list_max_length; | |
| 342 | 2327 |
| 2328 if (in_young_gc_mode()) { | |
| 2329 if (reached_target_length) { | |
|
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2330 assert( young_list_length > 0 && _g1->young_list()->length() > 0, |
| 342 | 2331 "invariant" ); |
| 2332 return true; | |
| 2333 } | |
| 2334 } else { | |
| 2335 guarantee( false, "should not reach here" ); | |
| 2336 } | |
| 2337 | |
| 2338 return false; | |
| 2339 } | |
| 2340 | |
| 2341 #ifndef PRODUCT | |
| 2342 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
| 2343 CollectionSetChooser* _chooser; | |
| 2344 public: | |
| 2345 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
| 2346 _chooser(chooser) {} | |
| 2347 | |
| 2348 bool doHeapRegion(HeapRegion* r) { | |
| 2349 if (!r->continuesHumongous()) { | |
| 2350 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
| 2351 } | |
| 2352 return false; | |
| 2353 } | |
| 2354 }; | |
| 2355 | |
| 2356 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
| 2357 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
| 2358 _g1->heap_region_iterate(&cl); | |
| 2359 return true; | |
| 2360 } | |
| 2361 #endif | |
| 2362 | |
|
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2363 bool |
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2364 G1CollectorPolicy::force_initial_mark_if_outside_cycle() { |
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2365 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2366 if (!during_cycle) { |
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2367 set_initiate_conc_mark_if_possible(); |
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2368 return true; |
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2369 } else { |
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2370 return false; |
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2371 } |
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2372 } |
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2373 |
| 342 | 2374 void |
|
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2375 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2376 // We are about to decide on whether this pause will be an |
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2377 // initial-mark pause. |
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2378 |
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2379 // First, during_initial_mark_pause() should not be already set. We |
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2380 // will set it here if we have to. However, it should be cleared by |
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2381 // the end of the pause (it's only set for the duration of an |
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2382 // initial-mark pause). |
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2383 assert(!during_initial_mark_pause(), "pre-condition"); |
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2384 |
|
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2385 if (initiate_conc_mark_if_possible()) { |
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2386 // We had noticed on a previous pause that the heap occupancy has |
|
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2387 // gone over the initiating threshold and we should start a |
|
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2388 // concurrent marking cycle. So we might initiate one. |
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2389 |
|
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2390 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2391 if (!during_cycle) { |
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2392 // The concurrent marking thread is not "during a cycle", i.e., |
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2393 // it has completed the last one. So we can go ahead and |
|
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2394 // initiate a new cycle. |
|
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2395 |
|
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2396 set_during_initial_mark_pause(); |
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2397 |
|
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2398 // And we can now clear initiate_conc_mark_if_possible() as |
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2399 // we've already acted on it. |
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2400 clear_initiate_conc_mark_if_possible(); |
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2401 } else { |
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2402 // The concurrent marking thread is still finishing up the |
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2403 // previous cycle. If we start one right now the two cycles |
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2404 // overlap. In particular, the concurrent marking thread might |
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2405 // be in the process of clearing the next marking bitmap (which |
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2406 // we will use for the next cycle if we start one). Starting a |
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2407 // cycle now will be bad given that parts of the marking |
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2408 // information might get cleared by the marking thread. And we |
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2409 // cannot wait for the marking thread to finish the cycle as it |
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2410 // periodically yields while clearing the next marking bitmap |
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2411 // and, if it's in a yield point, it's waiting for us to |
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2412 // finish. So, at this point we will not start a cycle and we'll |
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2413 // let the concurrent marking thread complete the last one. |
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2414 } |
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2415 } |
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2416 } |
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2417 |
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2418 void |
| 342 | 2419 G1CollectorPolicy_BestRegionsFirst:: |
| 2420 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
| 2421 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
| 2422 } | |
| 2423 | |
| 2424 class NextNonCSElemFinder: public HeapRegionClosure { | |
| 2425 HeapRegion* _res; | |
| 2426 public: | |
| 2427 NextNonCSElemFinder(): _res(NULL) {} | |
| 2428 bool doHeapRegion(HeapRegion* r) { | |
| 2429 if (!r->in_collection_set()) { | |
| 2430 _res = r; | |
| 2431 return true; | |
| 2432 } else { | |
| 2433 return false; | |
| 2434 } | |
| 2435 } | |
| 2436 HeapRegion* res() { return _res; } | |
| 2437 }; | |
| 2438 | |
| 2439 class KnownGarbageClosure: public HeapRegionClosure { | |
| 2440 CollectionSetChooser* _hrSorted; | |
| 2441 | |
| 2442 public: | |
| 2443 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
| 2444 _hrSorted(hrSorted) | |
| 2445 {} | |
| 2446 | |
| 2447 bool doHeapRegion(HeapRegion* r) { | |
| 2448 // We only include humongous regions in collection | |
| 2449 // sets when concurrent mark shows that their contained object is | |
| 2450 // unreachable. | |
| 2451 | |
| 2452 // Do we have any marking information for this region? | |
| 2453 if (r->is_marked()) { | |
| 2454 // We don't include humongous regions in collection | |
| 2455 // sets because we collect them immediately at the end of a marking | |
| 2456 // cycle. We also don't include young regions because we *must* | |
| 2457 // include them in the next collection pause. | |
| 2458 if (!r->isHumongous() && !r->is_young()) { | |
| 2459 _hrSorted->addMarkedHeapRegion(r); | |
| 2460 } | |
| 2461 } | |
| 2462 return false; | |
| 2463 } | |
| 2464 }; | |
| 2465 | |
| 2466 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
| 2467 CollectionSetChooser* _hrSorted; | |
| 2468 jint _marked_regions_added; | |
| 2469 jint _chunk_size; | |
| 2470 jint _cur_chunk_idx; | |
| 2471 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
| 2472 int _worker; | |
| 2473 int _invokes; | |
| 2474 | |
| 2475 void get_new_chunk() { | |
| 2476 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
| 2477 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
| 2478 } | |
| 2479 void add_region(HeapRegion* r) { | |
| 2480 if (_cur_chunk_idx == _cur_chunk_end) { | |
| 2481 get_new_chunk(); | |
| 2482 } | |
| 2483 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
| 2484 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
| 2485 _marked_regions_added++; | |
| 2486 _cur_chunk_idx++; | |
| 2487 } | |
| 2488 | |
| 2489 public: | |
| 2490 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
| 2491 jint chunk_size, | |
| 2492 int worker) : | |
| 2493 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
| 2494 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
| 2495 _invokes(0) | |
| 2496 {} | |
| 2497 | |
| 2498 bool doHeapRegion(HeapRegion* r) { | |
| 2499 // We only include humongous regions in collection | |
| 2500 // sets when concurrent mark shows that their contained object is | |
| 2501 // unreachable. | |
| 2502 _invokes++; | |
| 2503 | |
| 2504 // Do we have any marking information for this region? | |
| 2505 if (r->is_marked()) { | |
| 2506 // We don't include humongous regions in collection | |
| 2507 // sets because we collect them immediately at the end of a marking | |
| 2508 // cycle. | |
| 2509 // We also do not include young regions in collection sets | |
| 2510 if (!r->isHumongous() && !r->is_young()) { | |
| 2511 add_region(r); | |
| 2512 } | |
| 2513 } | |
| 2514 return false; | |
| 2515 } | |
| 2516 jint marked_regions_added() { return _marked_regions_added; } | |
| 2517 int invokes() { return _invokes; } | |
| 2518 }; | |
| 2519 | |
| 2520 class ParKnownGarbageTask: public AbstractGangTask { | |
| 2521 CollectionSetChooser* _hrSorted; | |
| 2522 jint _chunk_size; | |
| 2523 G1CollectedHeap* _g1; | |
| 2524 public: | |
| 2525 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
| 2526 AbstractGangTask("ParKnownGarbageTask"), | |
| 2527 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
| 2528 _g1(G1CollectedHeap::heap()) | |
| 2529 {} | |
| 2530 | |
| 2531 void work(int i) { | |
| 2532 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
| 2533 // Back to zero for the claim value. | |
| 355 | 2534 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
| 2535 HeapRegion::InitialClaimValue); | |
| 342 | 2536 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
| 2537 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
| 2538 if (G1PrintParCleanupStats) { | |
| 2539 gclog_or_tty->print(" Thread %d called %d times, added %d regions to list.\n", | |
| 2540 i, parKnownGarbageCl.invokes(), regions_added); | |
| 2541 } | |
| 2542 } | |
| 2543 }; | |
| 2544 | |
| 2545 void | |
| 2546 G1CollectorPolicy_BestRegionsFirst:: | |
| 2547 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
| 2548 size_t max_live_bytes) { | |
| 2549 double start; | |
| 2550 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
| 2551 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
| 2552 | |
| 2553 _collectionSetChooser->clearMarkedHeapRegions(); | |
| 2554 double clear_marked_end; | |
| 2555 if (G1PrintParCleanupStats) { | |
| 2556 clear_marked_end = os::elapsedTime(); | |
| 2557 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
| 2558 (clear_marked_end - start)*1000.0); | |
| 2559 } | |
| 2560 if (ParallelGCThreads > 0) { | |
| 2561 const size_t OverpartitionFactor = 4; | |
|
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2562 const size_t MinWorkUnit = 8; |
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2563 const size_t WorkUnit = |
| 342 | 2564 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2565 MinWorkUnit); |
| 342 | 2566 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2567 WorkUnit); |
| 342 | 2568 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2569 (int) WorkUnit); |
| 342 | 2570 _g1->workers()->run_task(&parKnownGarbageTask); |
| 355 | 2571 |
| 2572 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
| 2573 "sanity check"); | |
| 342 | 2574 } else { |
| 2575 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
| 2576 _g1->heap_region_iterate(&knownGarbagecl); | |
| 2577 } | |
| 2578 double known_garbage_end; | |
| 2579 if (G1PrintParCleanupStats) { | |
| 2580 known_garbage_end = os::elapsedTime(); | |
| 2581 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
| 2582 (known_garbage_end - clear_marked_end)*1000.0); | |
| 2583 } | |
| 2584 _collectionSetChooser->sortMarkedHeapRegions(); | |
| 2585 double sort_end; | |
| 2586 if (G1PrintParCleanupStats) { | |
| 2587 sort_end = os::elapsedTime(); | |
| 2588 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
| 2589 (sort_end - known_garbage_end)*1000.0); | |
| 2590 } | |
| 2591 | |
| 2592 record_concurrent_mark_cleanup_end_work2(); | |
| 2593 double work2_end; | |
| 2594 if (G1PrintParCleanupStats) { | |
| 2595 work2_end = os::elapsedTime(); | |
| 2596 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
| 2597 (work2_end - sort_end)*1000.0); | |
| 2598 } | |
| 2599 } | |
| 2600 | |
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2601 // Add the heap region at the head of the non-incremental collection set |
| 342 | 2602 void G1CollectorPolicy:: |
| 2603 add_to_collection_set(HeapRegion* hr) { | |
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2604 assert(_inc_cset_build_state == Active, "Precondition"); |
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2605 assert(!hr->is_young(), "non-incremental add of young region"); |
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2606 |
| 1282 | 2607 if (G1PrintHeapRegions) { |
| 1388 | 2608 gclog_or_tty->print_cr("added region to cset " |
| 2609 "%d:["PTR_FORMAT", "PTR_FORMAT"], " | |
| 2610 "top "PTR_FORMAT", %s", | |
| 2611 hr->hrs_index(), hr->bottom(), hr->end(), | |
| 2612 hr->top(), hr->is_young() ? "YOUNG" : "NOT_YOUNG"); | |
| 342 | 2613 } |
| 2614 | |
| 2615 if (_g1->mark_in_progress()) | |
| 2616 _g1->concurrent_mark()->registerCSetRegion(hr); | |
| 2617 | |
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2618 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
| 342 | 2619 hr->set_in_collection_set(true); |
| 2620 hr->set_next_in_collection_set(_collection_set); | |
| 2621 _collection_set = hr; | |
| 2622 _collection_set_size++; | |
| 2623 _collection_set_bytes_used_before += hr->used(); | |
| 526 | 2624 _g1->register_region_with_in_cset_fast_test(hr); |
| 342 | 2625 } |
| 2626 | |
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2627 // Initialize the per-collection-set information |
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2628 void G1CollectorPolicy::start_incremental_cset_building() { |
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2629 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2630 |
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2631 _inc_cset_head = NULL; |
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2632 _inc_cset_tail = NULL; |
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2633 _inc_cset_size = 0; |
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2634 _inc_cset_bytes_used_before = 0; |
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2635 |
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2636 if (in_young_gc_mode()) { |
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2637 _inc_cset_young_index = 0; |
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2638 } |
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2639 |
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2640 _inc_cset_max_finger = 0; |
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2641 _inc_cset_recorded_young_bytes = 0; |
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2642 _inc_cset_recorded_rs_lengths = 0; |
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2643 _inc_cset_predicted_elapsed_time_ms = 0; |
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2644 _inc_cset_predicted_bytes_to_copy = 0; |
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2645 _inc_cset_build_state = Active; |
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2646 } |
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2647 |
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2648 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2649 // This routine is used when: |
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2650 // * adding survivor regions to the incremental cset at the end of an |
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2651 // evacuation pause, |
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2652 // * adding the current allocation region to the incremental cset |
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2653 // when it is retired, and |
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2654 // * updating existing policy information for a region in the |
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2655 // incremental cset via young list RSet sampling. |
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2656 // Therefore this routine may be called at a safepoint by the |
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2657 // VM thread, or in-between safepoints by mutator threads (when |
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2658 // retiring the current allocation region) or a concurrent |
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2659 // refine thread (RSet sampling). |
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2660 |
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|
2661 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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|
2662 size_t used_bytes = hr->used(); |
|
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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
|
2663 |
|
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
|
2664 _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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parents:
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changeset
|
2665 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
|
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
|
2666 |
|
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
|
2667 _inc_cset_bytes_used_before += 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
|
2668 |
|
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
|
2669 // Cache the values we have added to the aggregated informtion |
|
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
|
2670 // in the heap region in case we have to remove this region from |
|
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
|
2671 // the incremental collection set, or it is updated by the |
|
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
|
2672 // rset 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
|
2673 hr->set_recorded_rs_length(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
|
2674 hr->set_predicted_elapsed_time_ms(region_elapsed_time_ms); |
|
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
|
2675 |
|
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
|
2676 #if PREDICTIONS_VERBOSE |
|
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
|
2677 size_t bytes_to_copy = predict_bytes_to_copy(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
|
2678 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
|
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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
|
2679 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2680 // Record 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:
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diff
changeset
|
2681 _inc_cset_recorded_young_bytes += used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2682 |
|
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
|
2683 // Cache the values we have added to the aggregated informtion |
|
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
|
2684 // in the heap region in case we have to remove this region from |
|
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
|
2685 // the incremental collection set, or it is updated by the |
|
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
|
2686 // rset 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
|
2687 hr->set_predicted_bytes_to_copy(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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changeset
|
2688 #endif // PREDICTIONS_VERBOSE |
|
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parents:
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diff
changeset
|
2689 } |
|
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
|
2690 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2691 void G1CollectorPolicy::remove_from_incremental_cset_info(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
|
2692 // This routine is currently only called as part of the updating of |
|
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
|
2693 // existing policy information for regions in the incremental cset that |
|
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
|
2694 // is performed by the concurrent refine thread(s) as part of young list |
|
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
|
2695 // RSet sampling. Therefore we should not be at a safepoint. |
|
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
|
2696 |
|
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
|
2697 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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parents:
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diff
changeset
|
2698 assert(hr->is_young(), "it should be"); |
|
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
|
2699 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2700 size_t used_bytes = hr->used(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2701 size_t old_rs_length = hr->recorded_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
|
2702 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2703 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2704 // Subtract the old recorded/predicted policy information for |
|
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
|
2705 // the given heap region from the collection set info. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2706 _inc_cset_recorded_rs_lengths -= old_rs_length; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2707 _inc_cset_predicted_elapsed_time_ms -= old_elapsed_time_ms; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2708 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2709 _inc_cset_bytes_used_before -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2710 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2711 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2712 hr->set_recorded_rs_length(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2713 hr->set_predicted_elapsed_time_ms(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2714 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2715 #if PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2716 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
johnc
parents:
1391
diff
changeset
|
2717 _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
johnc
parents:
1391
diff
changeset
|
2718 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2719 // Subtract the number of bytes used in this region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2720 _inc_cset_recorded_young_bytes -= used_bytes; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2721 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2722 // Clear the values cached in the heap region |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2723 hr->set_predicted_bytes_to_copy(0); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2724 #endif // PREDICTIONS_VERBOSE |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2725 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2726 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2727 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
johnc
parents:
1391
diff
changeset
|
2728 // 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
johnc
parents:
1391
diff
changeset
|
2729 assert(hr->is_young(), "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2730 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2731 remove_from_incremental_cset_info(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2732 add_to_incremental_cset_info(hr, new_rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2733 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2734 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2735 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
johnc
parents:
1391
diff
changeset
|
2736 assert( hr->is_young(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2737 assert( hr->young_index_in_cset() == -1, "invariant" ); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2738 assert(_inc_cset_build_state == Active, "Precondition"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2739 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2740 // 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
johnc
parents:
1391
diff
changeset
|
2741 // information in the heap region here (before the region gets added |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2742 // to the collection set). An individual heap region's cached values |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2743 // are calculated, aggregated with the policy collection set info, |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2744 // and cached in the heap region here (initially) and (subsequently) |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2745 // by the Young List sampling code. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2746 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2747 size_t rs_length = hr->rem_set()->occupied(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2748 add_to_incremental_cset_info(hr, rs_length); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2749 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2750 HeapWord* hr_end = hr->end(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2751 _inc_cset_max_finger = MAX2(_inc_cset_max_finger, hr_end); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2752 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2753 assert(!hr->in_collection_set(), "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2754 hr->set_in_collection_set(true); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2755 assert( hr->next_in_collection_set() == NULL, "invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2756 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2757 _inc_cset_size++; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2758 _g1->register_region_with_in_cset_fast_test(hr); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2759 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2760 hr->set_young_index_in_cset((int) _inc_cset_young_index); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2761 ++_inc_cset_young_index; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2762 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2763 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2764 // 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
|
2765 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
johnc
parents:
1391
diff
changeset
|
2766 // 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
|
2767 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
|
2768 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2769 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2770 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
|
2771 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2772 // 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
|
2773 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
|
2774 assert(_inc_cset_head == NULL, "invariant"); |
|
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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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|
2775 _inc_cset_head = hr; |
|
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2776 } else { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2777 _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:
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 _inc_cset_tail = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2780 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2781 if (G1PrintHeapRegions) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2782 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
|
2783 "%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
|
2784 "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
|
2785 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
|
2786 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
|
2787 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2788 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2789 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2790 // 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:
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diff
changeset
|
2791 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:
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diff
changeset
|
2792 // 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
|
2793 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
|
2794 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2795 // Do the 'common' stuff |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2796 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
|
2797 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2798 // 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:
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changeset
|
2799 hr->set_next_in_collection_set(_inc_cset_head); |
|
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
|
2800 if (_inc_cset_head == NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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changeset
|
2801 assert(_inc_cset_tail == NULL, "Invariant"); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
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changeset
|
2802 _inc_cset_tail = hr; |
|
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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 _inc_cset_head = hr; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2805 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2806 if (G1PrintHeapRegions) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2807 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
|
2808 "%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
|
2809 "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
|
2810 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
|
2811 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
|
2812 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2813 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2814 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2815 #ifndef PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2816 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
|
2817 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
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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 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
|
2820 HeapRegion* csr = list_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2821 while (csr != NULL) { |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2822 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
|
2823 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
|
2824 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
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parents:
1391
diff
changeset
|
2825 "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
|
2826 csr->bottom(), csr->end(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2827 csr->top(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2828 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
|
2829 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
|
2830 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
|
2831 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
|
2832 csr->is_young(), |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2833 csr->is_survivor()); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2834 csr = next; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2835 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2836 } |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2837 #endif // !PRODUCT |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2838 |
| 1707 | 2839 void |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2840 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2841 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
|
2842 // 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
|
2843 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
|
2844 |
| 342 | 2845 start_recording_regions(); |
| 2846 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2847 guarantee(target_pause_time_ms > 0.0, |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2848 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
|
2849 target_pause_time_ms)); |
|
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2850 guarantee(_collection_set == NULL, "Precondition"); |
| 342 | 2851 |
| 2852 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
| 2853 double predicted_pause_time_ms = base_time_ms; | |
| 2854 | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2855 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
| 342 | 2856 |
| 2857 // the 10% and 50% values are arbitrary... | |
|
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2858 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
|
2859 time_remaining_ms = 0.50 * target_pause_time_ms; |
| 342 | 2860 _within_target = false; |
| 2861 } else { | |
| 2862 _within_target = true; | |
| 2863 } | |
| 2864 | |
| 2865 // We figure out the number of bytes available for future to-space. | |
| 2866 // For new regions without marking information, we must assume the | |
| 2867 // worst-case of complete survival. If we have marking information for a | |
| 2868 // region, we can bound the amount of live data. We can add a number of | |
| 2869 // such regions, as long as the sum of the live data bounds does not | |
| 2870 // exceed the available evacuation space. | |
| 2871 size_t max_live_bytes = _g1->free_regions() * HeapRegion::GrainBytes; | |
| 2872 | |
| 2873 size_t expansion_bytes = | |
| 2874 _g1->expansion_regions() * HeapRegion::GrainBytes; | |
| 2875 | |
| 677 | 2876 _collection_set_bytes_used_before = 0; |
| 2877 _collection_set_size = 0; | |
| 342 | 2878 |
| 2879 // Adjust for expansion and slop. | |
| 2880 max_live_bytes = max_live_bytes + expansion_bytes; | |
| 2881 | |
| 677 | 2882 assert(_g1->regions_accounted_for(), "Region leakage!"); |
| 342 | 2883 |
| 2884 HeapRegion* hr; | |
| 2885 if (in_young_gc_mode()) { | |
| 2886 double young_start_time_sec = os::elapsedTime(); | |
| 2887 | |
| 2888 if (G1PolicyVerbose > 0) { | |
| 2889 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:
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diff
changeset
|
2890 _g1->young_list()->length()); |
| 342 | 2891 } |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2892 |
| 342 | 2893 _young_cset_length = 0; |
| 2894 _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
johnc
parents:
1391
diff
changeset
|
2895 |
| 342 | 2896 if (_last_young_gc_full) |
| 2897 ++_full_young_pause_num; | |
| 2898 else | |
| 2899 ++_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
|
2900 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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1391
diff
changeset
|
2901 // 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
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parents:
1391
diff
changeset
|
2902 // 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
|
2903 // [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
|
2904 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2905 hr = _g1->young_list()->first_survivor_region(); |
| 342 | 2906 while (hr != NULL) { |
|
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
|
2907 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
|
2908 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
|
2909 hr = hr->get_next_young_region(); |
| 342 | 2910 } |
| 2911 | |
|
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2912 // Clear the fields that point to the survivor list - they are |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2913 // all young now. |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2914 _g1->young_list()->clear_survivors(); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2915 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2916 if (_g1->mark_in_progress()) |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2917 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2918 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2919 _young_cset_length = _inc_cset_young_index; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2920 _collection_set = _inc_cset_head; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2921 _collection_set_size = _inc_cset_size; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2922 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2923 |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2924 // For young regions in the collection set, we assume the worst |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2925 // case of complete survival |
|
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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2926 max_live_bytes -= _inc_cset_size * HeapRegion::GrainBytes; |
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2927 |
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2928 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
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2929 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
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2930 |
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2931 // The number of recorded young regions is the incremental |
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2932 // collection set's current size |
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2933 set_recorded_young_regions(_inc_cset_size); |
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2934 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2935 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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2936 #if PREDICTIONS_VERBOSE |
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2937 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
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2938 #endif // PREDICTIONS_VERBOSE |
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2939 |
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2940 if (G1PolicyVerbose > 0) { |
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2941 gclog_or_tty->print_cr(" Added " PTR_FORMAT " Young Regions to CS.", |
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2942 _inc_cset_size); |
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2943 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", |
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2944 max_live_bytes/K); |
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2945 } |
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2946 |
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2947 assert(_inc_cset_size == _g1->young_list()->length(), "Invariant"); |
| 342 | 2948 |
| 2949 double young_end_time_sec = os::elapsedTime(); | |
| 2950 _recorded_young_cset_choice_time_ms = | |
| 2951 (young_end_time_sec - young_start_time_sec) * 1000.0; | |
| 2952 | |
|
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2953 // We are doing young collections so reset this. |
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2954 non_young_start_time_sec = young_end_time_sec; |
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2955 |
|
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2956 // Note we can use either _collection_set_size or |
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2957 // _young_cset_length here |
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2958 if (_collection_set_size > 0 && _last_young_gc_full) { |
| 342 | 2959 // don't bother adding more regions... |
| 2960 goto choose_collection_set_end; | |
| 2961 } | |
| 2962 } | |
| 2963 | |
| 2964 if (!in_young_gc_mode() || !full_young_gcs()) { | |
| 2965 bool should_continue = true; | |
| 2966 NumberSeq seq; | |
| 2967 double avg_prediction = 100000000000000000.0; // something very large | |
|
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2968 |
| 342 | 2969 do { |
| 2970 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
| 2971 avg_prediction); | |
| 677 | 2972 if (hr != NULL) { |
| 342 | 2973 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
| 2974 time_remaining_ms -= predicted_time_ms; | |
| 2975 predicted_pause_time_ms += predicted_time_ms; | |
| 2976 add_to_collection_set(hr); | |
|
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2977 record_non_young_cset_region(hr); |
| 342 | 2978 max_live_bytes -= MIN2(hr->max_live_bytes(), max_live_bytes); |
| 2979 if (G1PolicyVerbose > 0) { | |
| 2980 gclog_or_tty->print_cr(" (" SIZE_FORMAT " KB left in heap.)", | |
| 2981 max_live_bytes/K); | |
| 2982 } | |
| 2983 seq.add(predicted_time_ms); | |
| 2984 avg_prediction = seq.avg() + seq.sd(); | |
| 2985 } | |
| 2986 should_continue = | |
| 2987 ( hr != NULL) && | |
| 2988 ( (adaptive_young_list_length()) ? time_remaining_ms > 0.0 | |
| 2989 : _collection_set_size < _young_list_fixed_length ); | |
| 2990 } while (should_continue); | |
| 2991 | |
| 2992 if (!adaptive_young_list_length() && | |
| 2993 _collection_set_size < _young_list_fixed_length) | |
| 2994 _should_revert_to_full_young_gcs = true; | |
| 2995 } | |
| 2996 | |
| 2997 choose_collection_set_end: | |
|
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2998 stop_incremental_cset_building(); |
|
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2999 |
| 342 | 3000 count_CS_bytes_used(); |
| 3001 | |
| 3002 end_recording_regions(); | |
| 3003 | |
| 3004 double non_young_end_time_sec = os::elapsedTime(); | |
| 3005 _recorded_non_young_cset_choice_time_ms = | |
| 3006 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
| 3007 } | |
| 3008 | |
| 3009 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
| 3010 G1CollectorPolicy::record_full_collection_end(); | |
| 3011 _collectionSetChooser->updateAfterFullCollection(); | |
| 3012 } | |
| 3013 | |
| 3014 void G1CollectorPolicy_BestRegionsFirst:: | |
| 3015 expand_if_possible(size_t numRegions) { | |
| 3016 size_t expansion_bytes = numRegions * HeapRegion::GrainBytes; | |
| 3017 _g1->expand(expansion_bytes); | |
| 3018 } | |
| 3019 | |
| 3020 void G1CollectorPolicy_BestRegionsFirst:: | |
| 1707 | 3021 record_collection_pause_end() { |
| 3022 G1CollectorPolicy::record_collection_pause_end(); | |
| 342 | 3023 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
| 3024 } |