Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3980:8229bd737950
7075646: G1: fix inconsistencies in the monitoring data
Summary: Fixed a few inconsistencies in the monitoring data, in particular when reported from jstat.
Reviewed-by: jmasa, brutisso, johnc
author | tonyp |
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date | Fri, 23 Sep 2011 16:07:49 -0400 |
parents | 4dfb2df418f2 |
children | 273b46400613 |
rev | line source |
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342 | 1 /* |
2152 | 2 * Copyright (c) 2001, 2011, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "gc_implementation/g1/concurrentG1Refine.hpp" | |
27 #include "gc_implementation/g1/concurrentMark.hpp" | |
28 #include "gc_implementation/g1/concurrentMarkThread.inline.hpp" | |
29 #include "gc_implementation/g1/g1CollectedHeap.inline.hpp" | |
30 #include "gc_implementation/g1/g1CollectorPolicy.hpp" | |
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31 #include "gc_implementation/g1/g1ErgoVerbose.hpp" |
1972 | 32 #include "gc_implementation/g1/heapRegionRemSet.hpp" |
33 #include "gc_implementation/shared/gcPolicyCounters.hpp" | |
34 #include "runtime/arguments.hpp" | |
35 #include "runtime/java.hpp" | |
36 #include "runtime/mutexLocker.hpp" | |
37 #include "utilities/debug.hpp" | |
342 | 38 |
39 #define PREDICTIONS_VERBOSE 0 | |
40 | |
41 // <NEW PREDICTION> | |
42 | |
43 // Different defaults for different number of GC threads | |
44 // They were chosen by running GCOld and SPECjbb on debris with different | |
45 // numbers of GC threads and choosing them based on the results | |
46 | |
47 // all the same | |
48 static double rs_length_diff_defaults[] = { | |
49 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
50 }; | |
51 | |
52 static double cost_per_card_ms_defaults[] = { | |
53 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
54 }; | |
55 | |
56 // all the same | |
57 static double fully_young_cards_per_entry_ratio_defaults[] = { | |
58 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 | |
59 }; | |
60 | |
61 static double cost_per_entry_ms_defaults[] = { | |
62 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
63 }; | |
64 | |
65 static double cost_per_byte_ms_defaults[] = { | |
66 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
67 }; | |
68 | |
69 // these should be pretty consistent | |
70 static double constant_other_time_ms_defaults[] = { | |
71 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
72 }; | |
73 | |
74 | |
75 static double young_other_cost_per_region_ms_defaults[] = { | |
76 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
77 }; | |
78 | |
79 static double non_young_other_cost_per_region_ms_defaults[] = { | |
80 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
81 }; | |
82 | |
83 // </NEW PREDICTION> | |
84 | |
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85 // Help class for avoiding interleaved logging |
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86 class LineBuffer: public StackObj { |
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87 |
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88 private: |
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89 static const int BUFFER_LEN = 1024; |
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90 static const int INDENT_CHARS = 3; |
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91 char _buffer[BUFFER_LEN]; |
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92 int _indent_level; |
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93 int _cur; |
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94 |
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95 void vappend(const char* format, va_list ap) { |
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96 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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97 if (res != -1) { |
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98 _cur += res; |
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99 } else { |
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100 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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101 _buffer[BUFFER_LEN -1] = 0; |
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102 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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103 } |
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104 } |
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105 |
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106 public: |
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107 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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108 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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109 _buffer[_cur] = ' '; |
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110 } |
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111 } |
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112 |
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113 #ifndef PRODUCT |
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114 ~LineBuffer() { |
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115 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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116 } |
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117 #endif |
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118 |
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119 void append(const char* format, ...) { |
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120 va_list ap; |
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121 va_start(ap, format); |
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122 vappend(format, ap); |
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123 va_end(ap); |
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124 } |
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125 |
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126 void append_and_print_cr(const char* format, ...) { |
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127 va_list ap; |
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128 va_start(ap, format); |
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129 vappend(format, ap); |
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130 va_end(ap); |
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131 gclog_or_tty->print_cr("%s", _buffer); |
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132 _cur = _indent_level * INDENT_CHARS; |
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133 } |
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134 }; |
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135 |
342 | 136 G1CollectorPolicy::G1CollectorPolicy() : |
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137 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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138 ? ParallelGCThreads : 1), |
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139 |
342 | 140 _n_pauses(0), |
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141 _recent_rs_scan_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
342 | 142 _recent_pause_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
143 _recent_rs_sizes(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
144 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
145 _all_pause_times_ms(new NumberSeq()), | |
146 _stop_world_start(0.0), | |
147 _all_stop_world_times_ms(new NumberSeq()), | |
148 _all_yield_times_ms(new NumberSeq()), | |
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149 _using_new_ratio_calculations(false), |
342 | 150 |
151 _all_mod_union_times_ms(new NumberSeq()), | |
152 | |
677 | 153 _summary(new Summary()), |
342 | 154 |
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155 _cur_clear_ct_time_ms(0.0), |
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156 |
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157 _cur_ref_proc_time_ms(0.0), |
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158 _cur_ref_enq_time_ms(0.0), |
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159 |
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160 #ifndef PRODUCT |
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161 _min_clear_cc_time_ms(-1.0), |
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162 _max_clear_cc_time_ms(-1.0), |
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163 _cur_clear_cc_time_ms(0.0), |
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164 _cum_clear_cc_time_ms(0.0), |
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165 _num_cc_clears(0L), |
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166 #endif |
342 | 167 |
168 _region_num_young(0), | |
169 _region_num_tenured(0), | |
170 _prev_region_num_young(0), | |
171 _prev_region_num_tenured(0), | |
172 | |
173 _aux_num(10), | |
174 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
175 _cur_aux_start_times_ms(new double[_aux_num]), | |
176 _cur_aux_times_ms(new double[_aux_num]), | |
177 _cur_aux_times_set(new bool[_aux_num]), | |
178 | |
179 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
180 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
181 | |
182 // <NEW PREDICTION> | |
183 | |
184 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
185 _prev_collection_pause_end_ms(0.0), | |
186 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
187 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
188 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
189 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
190 _partially_young_cards_per_entry_ratio_seq( | |
191 new TruncatedSeq(TruncatedSeqLength)), | |
192 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
193 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
194 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
195 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
196 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
197 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
198 _non_young_other_cost_per_region_ms_seq( | |
199 new TruncatedSeq(TruncatedSeqLength)), | |
200 | |
201 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
202 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
203 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
204 | |
751 | 205 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 206 |
207 // </NEW PREDICTION> | |
208 | |
209 _full_young_gcs(true), | |
210 _full_young_pause_num(0), | |
211 _partial_young_pause_num(0), | |
212 | |
213 _during_marking(false), | |
214 _in_marking_window(false), | |
215 _in_marking_window_im(false), | |
216 | |
217 _known_garbage_ratio(0.0), | |
218 _known_garbage_bytes(0), | |
219 | |
220 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
221 | |
222 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
223 | |
224 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
225 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
226 | |
227 _recent_avg_pause_time_ratio(0.0), | |
228 _num_markings(0), | |
229 _n_marks(0), | |
230 _n_pauses_at_mark_end(0), | |
231 | |
232 _all_full_gc_times_ms(new NumberSeq()), | |
233 | |
234 // G1PausesBtwnConcMark defaults to -1 | |
235 // so the hack is to do the cast QQQ FIXME | |
236 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
237 _n_marks_since_last_pause(0), | |
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238 _initiate_conc_mark_if_possible(false), |
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239 _during_initial_mark_pause(false), |
342 | 240 _should_revert_to_full_young_gcs(false), |
241 _last_full_young_gc(false), | |
242 | |
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243 _eden_bytes_before_gc(0), |
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244 _survivor_bytes_before_gc(0), |
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245 _capacity_before_gc(0), |
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246 |
342 | 247 _prev_collection_pause_used_at_end_bytes(0), |
248 | |
249 _collection_set(NULL), | |
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250 _collection_set_size(0), |
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251 _collection_set_bytes_used_before(0), |
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252 |
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253 // Incremental CSet attributes |
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254 _inc_cset_build_state(Inactive), |
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255 _inc_cset_head(NULL), |
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256 _inc_cset_tail(NULL), |
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257 _inc_cset_size(0), |
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258 _inc_cset_young_index(0), |
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259 _inc_cset_bytes_used_before(0), |
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260 _inc_cset_max_finger(NULL), |
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261 _inc_cset_recorded_young_bytes(0), |
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262 _inc_cset_recorded_rs_lengths(0), |
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263 _inc_cset_predicted_elapsed_time_ms(0.0), |
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264 _inc_cset_predicted_bytes_to_copy(0), |
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265 |
342 | 266 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
267 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
268 #endif // _MSC_VER | |
269 | |
270 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
271 G1YoungSurvRateNumRegionsSummary)), | |
272 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 273 G1YoungSurvRateNumRegionsSummary)), |
342 | 274 // add here any more surv rate groups |
545 | 275 _recorded_survivor_regions(0), |
276 _recorded_survivor_head(NULL), | |
277 _recorded_survivor_tail(NULL), | |
1356 | 278 _survivors_age_table(true), |
279 | |
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280 _gc_overhead_perc(0.0) { |
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281 |
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282 // Set up the region size and associated fields. Given that the |
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283 // policy is created before the heap, we have to set this up here, |
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284 // so it's done as soon as possible. |
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285 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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286 HeapRegionRemSet::setup_remset_size(); |
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287 |
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288 G1ErgoVerbose::initialize(); |
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289 if (PrintAdaptiveSizePolicy) { |
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290 // Currently, we only use a single switch for all the heuristics. |
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291 G1ErgoVerbose::set_enabled(true); |
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292 // Given that we don't currently have a verboseness level |
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293 // parameter, we'll hardcode this to high. This can be easily |
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294 // changed in the future. |
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295 G1ErgoVerbose::set_level(ErgoHigh); |
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296 } else { |
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297 G1ErgoVerbose::set_enabled(false); |
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298 } |
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299 |
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300 // Verify PLAB sizes |
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301 const uint region_size = HeapRegion::GrainWords; |
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302 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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303 char buffer[128]; |
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304 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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305 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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306 vm_exit_during_initialization(buffer); |
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307 } |
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308 |
342 | 309 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
310 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
311 | |
1611 | 312 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 313 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
314 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
315 | |
316 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
317 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
318 | |
319 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
320 | |
321 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
322 | |
323 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 324 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
325 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 326 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
342 | 327 |
328 // start conservatively | |
751 | 329 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 330 |
331 // <NEW PREDICTION> | |
332 | |
333 int index; | |
334 if (ParallelGCThreads == 0) | |
335 index = 0; | |
336 else if (ParallelGCThreads > 8) | |
337 index = 7; | |
338 else | |
339 index = ParallelGCThreads - 1; | |
340 | |
341 _pending_card_diff_seq->add(0.0); | |
342 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
343 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
344 _fully_young_cards_per_entry_ratio_seq->add( | |
345 fully_young_cards_per_entry_ratio_defaults[index]); | |
346 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
347 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
348 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
349 _young_other_cost_per_region_ms_seq->add( | |
350 young_other_cost_per_region_ms_defaults[index]); | |
351 _non_young_other_cost_per_region_ms_seq->add( | |
352 non_young_other_cost_per_region_ms_defaults[index]); | |
353 | |
354 // </NEW PREDICTION> | |
355 | |
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356 // Below, we might need to calculate the pause time target based on |
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357 // the pause interval. When we do so we are going to give G1 maximum |
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358 // flexibility and allow it to do pauses when it needs to. So, we'll |
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359 // arrange that the pause interval to be pause time target + 1 to |
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360 // ensure that a) the pause time target is maximized with respect to |
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361 // the pause interval and b) we maintain the invariant that pause |
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362 // time target < pause interval. If the user does not want this |
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363 // maximum flexibility, they will have to set the pause interval |
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364 // explicitly. |
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365 |
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366 // First make sure that, if either parameter is set, its value is |
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367 // reasonable. |
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368 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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369 if (MaxGCPauseMillis < 1) { |
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370 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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371 "greater than 0"); |
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372 } |
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373 } |
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374 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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375 if (GCPauseIntervalMillis < 1) { |
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376 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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377 "greater than 0"); |
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378 } |
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379 } |
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380 |
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381 // Then, if the pause time target parameter was not set, set it to |
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382 // the default value. |
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383 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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384 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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385 // The default pause time target in G1 is 200ms |
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386 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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387 } else { |
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388 // We do not allow the pause interval to be set without the |
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389 // pause time target |
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390 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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391 "without setting MaxGCPauseMillis"); |
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392 } |
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393 } |
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394 |
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395 // Then, if the interval parameter was not set, set it according to |
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396 // the pause time target (this will also deal with the case when the |
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397 // pause time target is the default value). |
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398 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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399 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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400 } |
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401 |
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402 // Finally, make sure that the two parameters are consistent. |
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403 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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404 char buffer[256]; |
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405 jio_snprintf(buffer, 256, |
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406 "MaxGCPauseMillis (%u) should be less than " |
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407 "GCPauseIntervalMillis (%u)", |
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408 MaxGCPauseMillis, GCPauseIntervalMillis); |
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409 vm_exit_during_initialization(buffer); |
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410 } |
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411 |
751 | 412 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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413 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 414 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 415 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 416 |
417 // start conservatively (around 50ms is about right) | |
418 _concurrent_mark_remark_times_ms->add(0.05); | |
419 _concurrent_mark_cleanup_times_ms->add(0.20); | |
420 _tenuring_threshold = MaxTenuringThreshold; | |
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421 // _max_survivor_regions will be calculated by |
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422 // update_young_list_target_length() during initialization. |
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423 _max_survivor_regions = 0; |
545 | 424 |
1356 | 425 assert(GCTimeRatio > 0, |
426 "we should have set it to a default value set_g1_gc_flags() " | |
427 "if a user set it to 0"); | |
428 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
429 | |
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430 uintx reserve_perc = G1ReservePercent; |
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431 // Put an artificial ceiling on this so that it's not set to a silly value. |
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432 if (reserve_perc > 50) { |
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433 reserve_perc = 50; |
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434 warning("G1ReservePercent is set to a value that is too large, " |
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435 "it's been updated to %u", reserve_perc); |
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436 } |
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437 _reserve_factor = (double) reserve_perc / 100.0; |
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438 // This will be set when the heap is expanded |
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439 // for the first time during initialization. |
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440 _reserve_regions = 0; |
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441 |
342 | 442 initialize_all(); |
443 } | |
444 | |
445 // Increment "i", mod "len" | |
446 static void inc_mod(int& i, int len) { | |
447 i++; if (i == len) i = 0; | |
448 } | |
449 | |
450 void G1CollectorPolicy::initialize_flags() { | |
451 set_min_alignment(HeapRegion::GrainBytes); | |
452 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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453 if (SurvivorRatio < 1) { |
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454 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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455 } |
342 | 456 CollectorPolicy::initialize_flags(); |
457 } | |
458 | |
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459 // The easiest way to deal with the parsing of the NewSize / |
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460 // MaxNewSize / etc. parameteres is to re-use the code in the |
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461 // TwoGenerationCollectorPolicy class. This is similar to what |
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462 // ParallelScavenge does with its GenerationSizer class (see |
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463 // ParallelScavengeHeap::initialize()). We might change this in the |
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464 // future, but it's a good start. |
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465 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
3976 | 466 private: |
467 size_t size_to_region_num(size_t byte_size) { | |
468 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); | |
469 } | |
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470 |
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471 public: |
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472 G1YoungGenSizer() { |
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473 initialize_flags(); |
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474 initialize_size_info(); |
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475 } |
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476 size_t min_young_region_num() { |
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477 return size_to_region_num(_min_gen0_size); |
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478 } |
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479 size_t initial_young_region_num() { |
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480 return size_to_region_num(_initial_gen0_size); |
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481 } |
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482 size_t max_young_region_num() { |
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483 return size_to_region_num(_max_gen0_size); |
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484 } |
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485 }; |
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486 |
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487 void G1CollectorPolicy::update_young_list_size_using_newratio(size_t number_of_heap_regions) { |
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488 assert(number_of_heap_regions > 0, "Heap must be initialized"); |
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489 size_t young_size = number_of_heap_regions / (NewRatio + 1); |
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490 _min_desired_young_length = young_size; |
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491 _max_desired_young_length = young_size; |
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492 } |
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493 |
342 | 494 void G1CollectorPolicy::init() { |
495 // Set aside an initial future to_space. | |
496 _g1 = G1CollectedHeap::heap(); | |
497 | |
498 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
499 | |
545 | 500 initialize_gc_policy_counters(); |
501 | |
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502 G1YoungGenSizer sizer; |
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503 size_t initial_region_num = sizer.initial_young_region_num(); |
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504 _min_desired_young_length = sizer.min_young_region_num(); |
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505 _max_desired_young_length = sizer.max_young_region_num(); |
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506 |
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507 if (FLAG_IS_CMDLINE(NewRatio)) { |
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508 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
3976 | 509 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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510 } else { |
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511 // Treat NewRatio as a fixed size that is only recalculated when the heap size changes |
3976 | 512 update_young_list_size_using_newratio(_g1->n_regions()); |
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513 _using_new_ratio_calculations = true; |
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514 } |
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515 } |
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516 |
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517 // GenCollectorPolicy guarantees that min <= initial <= max. |
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518 // Asserting here just to state that we rely on this property. |
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519 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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520 assert(initial_region_num <= _max_desired_young_length, "Initial young gen size too large"); |
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521 assert(_min_desired_young_length <= initial_region_num, "Initial young gen size too small"); |
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522 |
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523 set_adaptive_young_list_length(_min_desired_young_length < _max_desired_young_length); |
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524 if (adaptive_young_list_length()) { |
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525 _young_list_fixed_length = 0; |
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526 } else { |
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527 _young_list_fixed_length = initial_region_num; |
342 | 528 } |
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529 _free_regions_at_end_of_collection = _g1->free_regions(); |
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530 update_young_list_target_length(); |
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531 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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532 |
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533 // We may immediately start allocating regions and placing them on the |
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534 // collection set list. Initialize the per-collection set info |
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535 start_incremental_cset_building(); |
342 | 536 } |
537 | |
545 | 538 // Create the jstat counters for the policy. |
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539 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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540 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 541 } |
542 | |
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543 bool G1CollectorPolicy::predict_will_fit(size_t young_length, |
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544 double base_time_ms, |
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545 size_t base_free_regions, |
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546 double target_pause_time_ms) { |
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547 if (young_length >= base_free_regions) { |
342 | 548 // end condition 1: not enough space for the young regions |
549 return false; | |
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550 } |
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551 |
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552 double accum_surv_rate = accum_yg_surv_rate_pred((int)(young_length - 1)); |
342 | 553 size_t bytes_to_copy = |
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554 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 555 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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556 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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557 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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558 if (pause_time_ms > target_pause_time_ms) { |
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559 // end condition 2: prediction is over the target pause time |
342 | 560 return false; |
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561 } |
342 | 562 |
563 size_t free_bytes = | |
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564 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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565 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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566 // end condition 3: out-of-space (conservatively!) |
342 | 567 return false; |
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568 } |
342 | 569 |
570 // success! | |
571 return true; | |
572 } | |
573 | |
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574 void G1CollectorPolicy::record_new_heap_size(size_t new_number_of_regions) { |
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575 // re-calculate the necessary reserve |
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576 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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577 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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578 // smaller than 1.0) we'll get 1. |
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579 _reserve_regions = (size_t) ceil(reserve_regions_d); |
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580 |
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581 if (_using_new_ratio_calculations) { |
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582 // -XX:NewRatio was specified so we need to update the |
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583 // young gen length when the heap size has changed. |
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584 update_young_list_size_using_newratio(new_number_of_regions); |
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585 } |
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586 } |
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587 |
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588 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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589 size_t base_min_length) { |
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590 size_t desired_min_length = 0; |
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591 if (adaptive_young_list_length()) { |
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592 if (_alloc_rate_ms_seq->num() > 3) { |
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593 double now_sec = os::elapsedTime(); |
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594 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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595 double alloc_rate_ms = predict_alloc_rate_ms(); |
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596 desired_min_length = (size_t) ceil(alloc_rate_ms * when_ms); |
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597 } else { |
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598 // otherwise we don't have enough info to make the prediction |
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599 } |
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600 } |
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601 desired_min_length += base_min_length; |
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602 // make sure we don't go below any user-defined minimum bound |
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603 return MAX2(_min_desired_young_length, desired_min_length); |
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604 } |
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605 |
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606 size_t G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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607 // Here, we might want to also take into account any additional |
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608 // constraints (i.e., user-defined minimum bound). Currently, we |
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609 // effectively don't set this bound. |
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610 return _max_desired_young_length; |
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611 } |
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612 |
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613 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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614 if (rs_lengths == (size_t) -1) { |
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615 // if it's set to the default value (-1), we should predict it; |
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616 // otherwise, use the given value. |
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617 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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618 } |
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619 |
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620 // Calculate the absolute and desired min bounds. |
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621 |
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622 // This is how many young regions we already have (currently: the survivors). |
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623 size_t base_min_length = recorded_survivor_regions(); |
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624 // This is the absolute minimum young length, which ensures that we |
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625 // can allocate one eden region in the worst-case. |
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626 size_t absolute_min_length = base_min_length + 1; |
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627 size_t desired_min_length = |
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628 calculate_young_list_desired_min_length(base_min_length); |
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629 if (desired_min_length < absolute_min_length) { |
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630 desired_min_length = absolute_min_length; |
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631 } |
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632 |
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633 // Calculate the absolute and desired max bounds. |
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634 |
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635 // We will try our best not to "eat" into the reserve. |
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636 size_t absolute_max_length = 0; |
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637 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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638 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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639 } |
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640 size_t desired_max_length = calculate_young_list_desired_max_length(); |
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641 if (desired_max_length > absolute_max_length) { |
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642 desired_max_length = absolute_max_length; |
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643 } |
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644 |
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645 size_t young_list_target_length = 0; |
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646 if (adaptive_young_list_length()) { |
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647 if (full_young_gcs()) { |
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648 young_list_target_length = |
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649 calculate_young_list_target_length(rs_lengths, |
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650 base_min_length, |
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651 desired_min_length, |
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652 desired_max_length); |
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653 _rs_lengths_prediction = rs_lengths; |
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654 } else { |
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655 // Don't calculate anything and let the code below bound it to |
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656 // the desired_min_length, i.e., do the next GC as soon as |
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657 // possible to maximize how many old regions we can add to it. |
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658 } |
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659 } else { |
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660 if (full_young_gcs()) { |
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661 young_list_target_length = _young_list_fixed_length; |
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662 } else { |
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663 // A bit arbitrary: during partially-young GCs we allocate half |
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664 // the young regions to try to add old regions to the CSet. |
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665 young_list_target_length = _young_list_fixed_length / 2; |
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666 // We choose to accept that we might go under the desired min |
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667 // length given that we intentionally ask for a smaller young gen. |
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668 desired_min_length = absolute_min_length; |
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669 } |
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670 } |
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671 |
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672 // Make sure we don't go over the desired max length, nor under the |
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673 // desired min length. In case they clash, desired_min_length wins |
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674 // which is why that test is second. |
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675 if (young_list_target_length > desired_max_length) { |
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676 young_list_target_length = desired_max_length; |
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677 } |
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678 if (young_list_target_length < desired_min_length) { |
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679 young_list_target_length = desired_min_length; |
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680 } |
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681 |
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682 assert(young_list_target_length > recorded_survivor_regions(), |
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683 "we should be able to allocate at least one eden region"); |
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684 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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685 _young_list_target_length = young_list_target_length; |
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686 |
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687 update_max_gc_locker_expansion(); |
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688 } |
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689 |
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690 size_t |
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691 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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692 size_t base_min_length, |
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693 size_t desired_min_length, |
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694 size_t desired_max_length) { |
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695 assert(adaptive_young_list_length(), "pre-condition"); |
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696 assert(full_young_gcs(), "only call this for fully-young GCs"); |
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697 |
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698 // In case some edge-condition makes the desired max length too small... |
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699 if (desired_max_length <= desired_min_length) { |
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700 return desired_min_length; |
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701 } |
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702 |
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703 // We'll adjust min_young_length and max_young_length not to include |
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704 // the already allocated young regions (i.e., so they reflect the |
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705 // min and max eden regions we'll allocate). The base_min_length |
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706 // will be reflected in the predictions by the |
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707 // survivor_regions_evac_time prediction. |
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708 assert(desired_min_length > base_min_length, "invariant"); |
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709 size_t min_young_length = desired_min_length - base_min_length; |
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710 assert(desired_max_length > base_min_length, "invariant"); |
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711 size_t max_young_length = desired_max_length - base_min_length; |
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712 |
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713 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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714 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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715 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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716 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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717 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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718 double base_time_ms = |
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719 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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720 survivor_regions_evac_time; |
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721 size_t available_free_regions = _free_regions_at_end_of_collection; |
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722 size_t base_free_regions = 0; |
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723 if (available_free_regions > _reserve_regions) { |
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724 base_free_regions = available_free_regions - _reserve_regions; |
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725 } |
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726 |
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727 // Here, we will make sure that the shortest young length that |
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728 // makes sense fits within the target pause time. |
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729 |
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730 if (predict_will_fit(min_young_length, base_time_ms, |
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731 base_free_regions, target_pause_time_ms)) { |
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732 // The shortest young length will fit into the target pause time; |
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733 // we'll now check whether the absolute maximum number of young |
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734 // regions will fit in the target pause time. If not, we'll do |
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735 // a binary search between min_young_length and max_young_length. |
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736 if (predict_will_fit(max_young_length, base_time_ms, |
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737 base_free_regions, target_pause_time_ms)) { |
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738 // The maximum young length will fit into the target pause time. |
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739 // We are done so set min young length to the maximum length (as |
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740 // the result is assumed to be returned in min_young_length). |
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741 min_young_length = max_young_length; |
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742 } else { |
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743 // The maximum possible number of young regions will not fit within |
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744 // the target pause time so we'll search for the optimal |
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745 // length. The loop invariants are: |
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746 // |
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747 // min_young_length < max_young_length |
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748 // min_young_length is known to fit into the target pause time |
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749 // max_young_length is known not to fit into the target pause time |
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750 // |
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751 // Going into the loop we know the above hold as we've just |
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752 // checked them. Every time around the loop we check whether |
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753 // the middle value between min_young_length and |
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754 // max_young_length fits into the target pause time. If it |
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755 // does, it becomes the new min. If it doesn't, it becomes |
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756 // the new max. This way we maintain the loop invariants. |
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757 |
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758 assert(min_young_length < max_young_length, "invariant"); |
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759 size_t diff = (max_young_length - min_young_length) / 2; |
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760 while (diff > 0) { |
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761 size_t young_length = min_young_length + diff; |
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762 if (predict_will_fit(young_length, base_time_ms, |
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763 base_free_regions, target_pause_time_ms)) { |
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764 min_young_length = young_length; |
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765 } else { |
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766 max_young_length = young_length; |
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767 } |
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768 assert(min_young_length < max_young_length, "invariant"); |
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769 diff = (max_young_length - min_young_length) / 2; |
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770 } |
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771 // The results is min_young_length which, according to the |
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772 // loop invariants, should fit within the target pause time. |
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773 |
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774 // These are the post-conditions of the binary search above: |
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775 assert(min_young_length < max_young_length, |
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776 "otherwise we should have discovered that max_young_length " |
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777 "fits into the pause target and not done the binary search"); |
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778 assert(predict_will_fit(min_young_length, base_time_ms, |
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779 base_free_regions, target_pause_time_ms), |
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780 "min_young_length, the result of the binary search, should " |
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781 "fit into the pause target"); |
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782 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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783 base_free_regions, target_pause_time_ms), |
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784 "min_young_length, the result of the binary search, should be " |
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785 "optimal, so no larger length should fit into the pause target"); |
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786 } |
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787 } else { |
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788 // Even the minimum length doesn't fit into the pause time |
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789 // target, return it as the result nevertheless. |
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790 } |
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791 return base_min_length + min_young_length; |
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792 } |
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793 |
545 | 794 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
795 double survivor_regions_evac_time = 0.0; | |
796 for (HeapRegion * r = _recorded_survivor_head; | |
797 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
798 r = r->get_next_young_region()) { | |
799 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
800 } | |
801 return survivor_regions_evac_time; | |
802 } | |
803 | |
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804 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 805 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
806 | |
1394
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807 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 808 if (rs_lengths > _rs_lengths_prediction) { |
809 // add 10% to avoid having to recalculate often | |
810 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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811 update_young_list_target_length(rs_lengths_prediction); |
342 | 812 } |
813 } | |
814 | |
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815 |
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816 |
342 | 817 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
818 bool is_tlab, | |
819 bool* gc_overhead_limit_was_exceeded) { | |
820 guarantee(false, "Not using this policy feature yet."); | |
821 return NULL; | |
822 } | |
823 | |
824 // This method controls how a collector handles one or more | |
825 // of its generations being fully allocated. | |
826 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
827 bool is_tlab) { | |
828 guarantee(false, "Not using this policy feature yet."); | |
829 return NULL; | |
830 } | |
831 | |
832 | |
833 #ifndef PRODUCT | |
834 bool G1CollectorPolicy::verify_young_ages() { | |
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835 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 836 return |
837 verify_young_ages(head, _short_lived_surv_rate_group); | |
838 // also call verify_young_ages on any additional surv rate groups | |
839 } | |
840 | |
841 bool | |
842 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
843 SurvRateGroup *surv_rate_group) { | |
844 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
845 | |
846 const char* name = surv_rate_group->name(); | |
847 bool ret = true; | |
848 int prev_age = -1; | |
849 | |
850 for (HeapRegion* curr = head; | |
851 curr != NULL; | |
852 curr = curr->get_next_young_region()) { | |
853 SurvRateGroup* group = curr->surv_rate_group(); | |
854 if (group == NULL && !curr->is_survivor()) { | |
855 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
856 ret = false; | |
857 } | |
858 | |
859 if (surv_rate_group == group) { | |
860 int age = curr->age_in_surv_rate_group(); | |
861 | |
862 if (age < 0) { | |
863 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
864 ret = false; | |
865 } | |
866 | |
867 if (age <= prev_age) { | |
868 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
869 "(%d, %d)", name, age, prev_age); | |
870 ret = false; | |
871 } | |
872 prev_age = age; | |
873 } | |
874 } | |
875 | |
876 return ret; | |
877 } | |
878 #endif // PRODUCT | |
879 | |
880 void G1CollectorPolicy::record_full_collection_start() { | |
881 _cur_collection_start_sec = os::elapsedTime(); | |
882 // Release the future to-space so that it is available for compaction into. | |
883 _g1->set_full_collection(); | |
884 } | |
885 | |
886 void G1CollectorPolicy::record_full_collection_end() { | |
887 // Consider this like a collection pause for the purposes of allocation | |
888 // since last pause. | |
889 double end_sec = os::elapsedTime(); | |
890 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
891 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
892 | |
893 _all_full_gc_times_ms->add(full_gc_time_ms); | |
894 | |
595
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895 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 896 |
897 _g1->clear_full_collection(); | |
898 | |
899 // "Nuke" the heuristics that control the fully/partially young GC | |
900 // transitions and make sure we start with fully young GCs after the | |
901 // Full GC. | |
902 set_full_young_gcs(true); | |
903 _last_full_young_gc = false; | |
904 _should_revert_to_full_young_gcs = false; | |
1359
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905 clear_initiate_conc_mark_if_possible(); |
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906 clear_during_initial_mark_pause(); |
342 | 907 _known_garbage_bytes = 0; |
908 _known_garbage_ratio = 0.0; | |
909 _in_marking_window = false; | |
910 _in_marking_window_im = false; | |
911 | |
912 _short_lived_surv_rate_group->start_adding_regions(); | |
913 // also call this on any additional surv rate groups | |
914 | |
545 | 915 record_survivor_regions(0, NULL, NULL); |
916 | |
342 | 917 _prev_region_num_young = _region_num_young; |
918 _prev_region_num_tenured = _region_num_tenured; | |
919 | |
920 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 921 // Reset survivors SurvRateGroup. |
922 _survivor_surv_rate_group->reset(); | |
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923 update_young_list_target_length(); |
1973 | 924 } |
342 | 925 |
926 void G1CollectorPolicy::record_stop_world_start() { | |
927 _stop_world_start = os::elapsedTime(); | |
928 } | |
929 | |
930 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
931 size_t start_used) { | |
932 if (PrintGCDetails) { | |
933 gclog_or_tty->stamp(PrintGCTimeStamps); | |
934 gclog_or_tty->print("[GC pause"); | |
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935 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
342 | 936 } |
937 | |
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938 // We only need to do this here as the policy will only be applied |
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939 // to the GC we're about to start. so, no point is calculating this |
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940 // every time we calculate / recalculate the target young length. |
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941 update_survivors_policy(); |
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942 |
1973 | 943 assert(_g1->used() == _g1->recalculate_used(), |
944 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
945 _g1->used(), _g1->recalculate_used())); | |
342 | 946 |
947 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
948 _all_stop_world_times_ms->add(s_w_t_ms); | |
949 _stop_world_start = 0.0; | |
950 | |
951 _cur_collection_start_sec = start_time_sec; | |
952 _cur_collection_pause_used_at_start_bytes = start_used; | |
953 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
954 _pending_cards = _g1->pending_card_num(); | |
955 _max_pending_cards = _g1->max_pending_card_num(); | |
956 | |
957 _bytes_in_collection_set_before_gc = 0; | |
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958 _bytes_copied_during_gc = 0; |
342 | 959 |
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960 YoungList* young_list = _g1->young_list(); |
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961 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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962 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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963 _capacity_before_gc = _g1->capacity(); |
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964 |
342 | 965 #ifdef DEBUG |
966 // initialise these to something well known so that we can spot | |
967 // if they are not set properly | |
968 | |
969 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 970 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
971 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
972 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
973 _par_last_update_rs_times_ms[i] = -1234.0; | |
974 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
975 _par_last_scan_rs_times_ms[i] = -1234.0; | |
976 _par_last_obj_copy_times_ms[i] = -1234.0; | |
977 _par_last_termination_times_ms[i] = -1234.0; | |
978 _par_last_termination_attempts[i] = -1234.0; | |
979 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 980 _par_last_gc_worker_times_ms[i] = -1234.0; |
342 | 981 } |
982 #endif | |
983 | |
984 for (int i = 0; i < _aux_num; ++i) { | |
985 _cur_aux_times_ms[i] = 0.0; | |
986 _cur_aux_times_set[i] = false; | |
987 } | |
988 | |
989 _satb_drain_time_set = false; | |
990 _last_satb_drain_processed_buffers = -1; | |
991 | |
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992 _last_young_gc_full = false; |
342 | 993 |
994 // do that for any other surv rate groups | |
995 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 996 _survivors_age_table.clear(); |
545 | 997 |
342 | 998 assert( verify_young_ages(), "region age verification" ); |
999 } | |
1000 | |
1001 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
1002 _mark_closure_time_ms = mark_closure_time_ms; | |
1003 } | |
1004 | |
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1005 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 1006 mark_init_elapsed_time_ms) { |
1007 _during_marking = true; | |
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1008 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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1009 clear_during_initial_mark_pause(); |
342 | 1010 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
1011 } | |
1012 | |
1013 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
1014 _mark_remark_start_sec = os::elapsedTime(); | |
1015 _during_marking = false; | |
1016 } | |
1017 | |
1018 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
1019 double end_time_sec = os::elapsedTime(); | |
1020 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
1021 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
1022 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1023 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1024 | |
1025 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
1026 } | |
1027 | |
1028 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
1029 _mark_cleanup_start_sec = os::elapsedTime(); | |
1030 } | |
1031 | |
1032 void | |
1033 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1034 size_t max_live_bytes) { | |
1035 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
1036 record_concurrent_mark_cleanup_end_work2(); | |
1037 } | |
1038 | |
1039 void | |
1040 G1CollectorPolicy:: | |
1041 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
1042 size_t max_live_bytes) { | |
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1043 if (_n_marks < 2) { |
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1044 _n_marks++; |
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1045 } |
342 | 1046 } |
1047 | |
1048 // The important thing about this is that it includes "os::elapsedTime". | |
1049 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
1050 double end_time_sec = os::elapsedTime(); | |
1051 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
1052 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1053 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1054 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1055 | |
1056 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
1057 | |
1058 _num_markings++; | |
1059 _n_pauses_at_mark_end = _n_pauses; | |
1060 _n_marks_since_last_pause++; | |
1061 } | |
1062 | |
1063 void | |
1064 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
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1065 _should_revert_to_full_young_gcs = false; |
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1066 _last_full_young_gc = true; |
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1067 _in_marking_window = false; |
342 | 1068 } |
1069 | |
1070 void G1CollectorPolicy::record_concurrent_pause() { | |
1071 if (_stop_world_start > 0.0) { | |
1072 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1073 _all_yield_times_ms->add(yield_ms); | |
1074 } | |
1075 } | |
1076 | |
1077 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1078 } | |
1079 | |
1080 template<class T> | |
1081 T sum_of(T* sum_arr, int start, int n, int N) { | |
1082 T sum = (T)0; | |
1083 for (int i = 0; i < n; i++) { | |
1084 int j = (start + i) % N; | |
1085 sum += sum_arr[j]; | |
1086 } | |
1087 return sum; | |
1088 } | |
1089 | |
1611 | 1090 void G1CollectorPolicy::print_par_stats(int level, |
1091 const char* str, | |
2430 | 1092 double* data) { |
342 | 1093 double min = data[0], max = data[0]; |
1094 double total = 0.0; | |
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1095 LineBuffer buf(level); |
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1096 buf.append("[%s (ms):", str); |
342 | 1097 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1098 double val = data[i]; | |
1099 if (val < min) | |
1100 min = val; | |
1101 if (val > max) | |
1102 max = val; | |
1103 total += val; | |
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1104 buf.append(" %3.1lf", val); |
342 | 1105 } |
2430 | 1106 buf.append_and_print_cr(""); |
1107 double avg = total / (double) ParallelGCThreads; | |
1108 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
1109 avg, min, max, max - min); | |
342 | 1110 } |
1111 | |
1611 | 1112 void G1CollectorPolicy::print_par_sizes(int level, |
1113 const char* str, | |
2430 | 1114 double* data) { |
342 | 1115 double min = data[0], max = data[0]; |
1116 double total = 0.0; | |
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1117 LineBuffer buf(level); |
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1118 buf.append("[%s :", str); |
342 | 1119 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1120 double val = data[i]; | |
1121 if (val < min) | |
1122 min = val; | |
1123 if (val > max) | |
1124 max = val; | |
1125 total += val; | |
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1126 buf.append(" %d", (int) val); |
342 | 1127 } |
2430 | 1128 buf.append_and_print_cr(""); |
1129 double avg = total / (double) ParallelGCThreads; | |
1130 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
1131 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1132 } |
1133 | |
1134 void G1CollectorPolicy::print_stats (int level, | |
1135 const char* str, | |
1136 double value) { | |
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1137 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1138 } |
1139 | |
1140 void G1CollectorPolicy::print_stats (int level, | |
1141 const char* str, | |
1142 int value) { | |
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1143 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1144 } |
1145 | |
1146 double G1CollectorPolicy::avg_value (double* data) { | |
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1147 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1148 double ret = 0.0; |
1149 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1150 ret += data[i]; | |
1151 return ret / (double) ParallelGCThreads; | |
1152 } else { | |
1153 return data[0]; | |
1154 } | |
1155 } | |
1156 | |
1157 double G1CollectorPolicy::max_value (double* data) { | |
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1158 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1159 double ret = data[0]; |
1160 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1161 if (data[i] > ret) | |
1162 ret = data[i]; | |
1163 return ret; | |
1164 } else { | |
1165 return data[0]; | |
1166 } | |
1167 } | |
1168 | |
1169 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1170 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1171 double sum = 0.0; |
1172 for (uint i = 0; i < ParallelGCThreads; i++) | |
1173 sum += data[i]; | |
1174 return sum; | |
1175 } else { | |
1176 return data[0]; | |
1177 } | |
1178 } | |
1179 | |
1180 double G1CollectorPolicy::max_sum (double* data1, | |
1181 double* data2) { | |
1182 double ret = data1[0] + data2[0]; | |
1183 | |
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1184 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1185 for (uint i = 1; i < ParallelGCThreads; ++i) { |
1186 double data = data1[i] + data2[i]; | |
1187 if (data > ret) | |
1188 ret = data; | |
1189 } | |
1190 } | |
1191 return ret; | |
1192 } | |
1193 | |
1194 // Anything below that is considered to be zero | |
1195 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1196 | |
1707 | 1197 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1198 double end_time_sec = os::elapsedTime(); |
1199 double elapsed_ms = _last_pause_time_ms; | |
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1200 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1201 size_t rs_size = |
1202 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1203 size_t cur_used_bytes = _g1->used(); | |
1204 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1205 bool last_pause_included_initial_mark = false; | |
1707 | 1206 bool update_stats = !_g1->evacuation_failed(); |
342 | 1207 |
1208 #ifndef PRODUCT | |
1209 if (G1YoungSurvRateVerbose) { | |
1210 gclog_or_tty->print_cr(""); | |
1211 _short_lived_surv_rate_group->print(); | |
1212 // do that for any other surv rate groups too | |
1213 } | |
1214 #endif // PRODUCT | |
1215 | |
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1216 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1217 if (last_pause_included_initial_mark) |
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1218 record_concurrent_mark_init_end(0.0); |
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1219 |
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1220 size_t marking_initiating_used_threshold = |
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1221 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1222 |
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1223 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1224 assert(!last_pause_included_initial_mark, "invariant"); |
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1225 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1226 if (cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1227 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1228 |
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1229 ergo_verbose3(ErgoConcCycles, |
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1230 "request concurrent cycle initiation", |
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1231 ergo_format_reason("occupancy higher than threshold") |
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1232 ergo_format_byte("occupancy") |
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1233 ergo_format_byte_perc("threshold"), |
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1234 cur_used_bytes, |
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1235 marking_initiating_used_threshold, |
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1236 (double) InitiatingHeapOccupancyPercent); |
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1237 |
1359
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1238 // Note: this might have already been set, if during the last |
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1239 // pause we decided to start a cycle but at the beginning of |
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1240 // this pause we decided to postpone it. That's OK. |
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1241 set_initiate_conc_mark_if_possible(); |
3914
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1242 } else { |
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1243 ergo_verbose2(ErgoConcCycles, |
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1244 "do not request concurrent cycle initiation", |
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1245 ergo_format_reason("occupancy lower than previous occupancy") |
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1246 ergo_format_byte("occupancy") |
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1247 ergo_format_byte("previous occupancy"), |
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1248 cur_used_bytes, |
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1249 _prev_collection_pause_used_at_end_bytes); |
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1250 } |
342 | 1251 } |
1252 } | |
1253 | |
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1254 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1255 |
342 | 1256 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1257 end_time_sec, false); | |
1258 | |
1259 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1260 collection_set_size(), | |
1261 "Negative RS size?"); | |
1262 | |
1263 // This assert is exempted when we're doing parallel collection pauses, | |
1264 // because the fragmentation caused by the parallel GC allocation buffers | |
1265 // can lead to more memory being used during collection than was used | |
1266 // before. Best leave this out until the fragmentation problem is fixed. | |
1267 // Pauses in which evacuation failed can also lead to negative | |
1268 // collections, since no space is reclaimed from a region containing an | |
1269 // object whose evacuation failed. | |
1270 // Further, we're now always doing parallel collection. But I'm still | |
1271 // leaving this here as a placeholder for a more precise assertion later. | |
1272 // (DLD, 10/05.) | |
1273 assert((true || parallel) // Always using GC LABs now. | |
1274 || _g1->evacuation_failed() | |
1275 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1276 "Negative collection"); | |
1277 | |
1278 size_t freed_bytes = | |
1279 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1280 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1281 |
342 | 1282 double survival_fraction = |
1283 (double)surviving_bytes/ | |
1284 (double)_collection_set_bytes_used_before; | |
1285 | |
1286 _n_pauses++; | |
1287 | |
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1288 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1289 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1290 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1291 double update_rs_processed_buffers = |
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1292 sum_of_values(_par_last_update_rs_processed_buffers); |
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1293 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1294 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1295 double termination_time = avg_value(_par_last_termination_times_ms); |
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1296 |
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1297 double parallel_known_time = update_rs_time + |
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1298 ext_root_scan_time + |
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1299 mark_stack_scan_time + |
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1300 scan_rs_time + |
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1301 obj_copy_time + |
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1302 termination_time; |
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1303 |
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1304 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; |
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1305 |
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1306 PauseSummary* summary = _summary; |
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1307 |
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1308 if (update_stats) { |
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1309 _recent_rs_scan_times_ms->add(scan_rs_time); |
342 | 1310 _recent_pause_times_ms->add(elapsed_ms); |
1311 _recent_rs_sizes->add(rs_size); | |
1312 | |
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1313 MainBodySummary* body_summary = summary->main_body_summary(); |
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1314 guarantee(body_summary != NULL, "should not be null!"); |
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1315 |
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1316 if (_satb_drain_time_set) |
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1317 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
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1318 else |
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1319 body_summary->record_satb_drain_time_ms(0.0); |
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1320 |
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1321 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1322 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1323 body_summary->record_update_rs_time_ms(update_rs_time); |
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1324 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1325 body_summary->record_obj_copy_time_ms(obj_copy_time); |
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1326 if (parallel) { |
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1327 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1328 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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1329 body_summary->record_termination_time_ms(termination_time); |
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1330 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1331 } |
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1332 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
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1333 |
342 | 1334 // We exempt parallel collection from this check because Alloc Buffer |
1335 // fragmentation can produce negative collections. Same with evac | |
1336 // failure. | |
1337 // Further, we're now always doing parallel collection. But I'm still | |
1338 // leaving this here as a placeholder for a more precise assertion later. | |
1339 // (DLD, 10/05. | |
1340 assert((true || parallel) | |
1341 || _g1->evacuation_failed() | |
1342 || surviving_bytes <= _collection_set_bytes_used_before, | |
1343 "Or else negative collection!"); | |
1344 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1345 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1346 | |
1347 // this is where we update the allocation rate of the application | |
1348 double app_time_ms = | |
1349 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1350 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1351 // This usually happens due to the timer not having the required | |
1352 // granularity. Some Linuxes are the usual culprits. | |
1353 // We'll just set it to something (arbitrarily) small. | |
1354 app_time_ms = 1.0; | |
1355 } | |
1356 size_t regions_allocated = | |
1357 (_region_num_young - _prev_region_num_young) + | |
1358 (_region_num_tenured - _prev_region_num_tenured); | |
1359 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1360 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1361 _prev_region_num_young = _region_num_young; | |
1362 _prev_region_num_tenured = _region_num_tenured; | |
1363 | |
1364 double interval_ms = | |
1365 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1366 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1367 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1368 if (recent_avg_pause_time_ratio() < 0.0 || |
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1369 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1370 #ifndef PRODUCT |
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1371 // Dump info to allow post-facto debugging |
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1372 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1373 gclog_or_tty->print_cr("-------------------------------------------"); |
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1374 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1375 _recent_gc_times_ms->dump(); |
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1376 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1377 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1378 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1379 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1380 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1381 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1382 #endif // !PRODUCT |
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1383 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1384 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
1086
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1385 if (_recent_avg_pause_time_ratio < 0.0) { |
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1386 _recent_avg_pause_time_ratio = 0.0; |
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1387 } else { |
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1388 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1389 _recent_avg_pause_time_ratio = 1.0; |
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1390 } |
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1391 } |
342 | 1392 } |
1393 | |
1394 if (G1PolicyVerbose > 1) { | |
1395 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1396 } | |
1397 | |
1398 if (G1PolicyVerbose > 1) { | |
1399 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1400 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1401 " |RS|: " SIZE_FORMAT, | |
1402 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
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1403 scan_rs_time, recent_avg_time_for_rs_scan_ms(), |
342 | 1404 rs_size); |
1405 | |
1406 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1407 " At end " SIZE_FORMAT "K\n" | |
1408 " garbage : " SIZE_FORMAT "K" | |
1409 " of " SIZE_FORMAT "K\n" | |
1410 " survival : %6.2f%% (%6.2f%% avg)", | |
1411 _cur_collection_pause_used_at_start_bytes/K, | |
1412 _g1->used()/K, freed_bytes/K, | |
1413 _collection_set_bytes_used_before/K, | |
1414 survival_fraction*100.0, | |
1415 recent_avg_survival_fraction()*100.0); | |
1416 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1417 recent_avg_pause_time_ratio() * 100.0); | |
1418 } | |
1419 | |
1420 double other_time_ms = elapsed_ms; | |
1421 | |
1707 | 1422 if (_satb_drain_time_set) { |
1423 other_time_ms -= _cur_satb_drain_time_ms; | |
1424 } | |
1425 | |
1426 if (parallel) { | |
1427 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1428 } else { | |
1429 other_time_ms -= | |
1430 update_rs_time + | |
1431 ext_root_scan_time + mark_stack_scan_time + | |
1432 scan_rs_time + obj_copy_time; | |
342 | 1433 } |
1434 | |
1435 if (PrintGCDetails) { | |
1707 | 1436 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1437 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1438 elapsed_ms / 1000.0); | |
1439 | |
1707 | 1440 if (_satb_drain_time_set) { |
1441 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1442 } | |
1443 if (_last_satb_drain_processed_buffers >= 0) { | |
1444 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1445 } | |
1446 if (parallel) { | |
1447 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
2430 | 1448 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
1707 | 1449 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1450 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1451 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1452 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1707 | 1453 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1454 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1455 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1456 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1457 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
1458 | |
1459 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1460 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
1461 } | |
1462 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
1463 | |
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1464 print_stats(2, "Parallel Other", parallel_other_time); |
1707 | 1465 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
1466 } else { | |
1467 print_stats(1, "Update RS", update_rs_time); | |
1468 print_stats(2, "Processed Buffers", | |
1469 (int)update_rs_processed_buffers); | |
1470 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1471 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1472 print_stats(1, "Scan RS", scan_rs_time); | |
1473 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1474 } |
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1475 #ifndef PRODUCT |
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1476 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1477 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1478 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1479 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1480 if (_num_cc_clears > 0) { |
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1481 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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|
1482 } |
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1483 #endif |
342 | 1484 print_stats(1, "Other", other_time_ms); |
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1485 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
3979
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1486 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1487 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1488 |
342 | 1489 for (int i = 0; i < _aux_num; ++i) { |
1490 if (_cur_aux_times_set[i]) { | |
1491 char buffer[96]; | |
1492 sprintf(buffer, "Aux%d", i); | |
1493 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1494 } | |
1495 } | |
1496 } | |
1497 | |
1498 _all_pause_times_ms->add(elapsed_ms); | |
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1499 if (update_stats) { |
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1500 summary->record_total_time_ms(elapsed_ms); |
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1501 summary->record_other_time_ms(other_time_ms); |
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1502 } |
342 | 1503 for (int i = 0; i < _aux_num; ++i) |
1504 if (_cur_aux_times_set[i]) | |
1505 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1506 | |
1507 // Reset marks-between-pauses counter. | |
1508 _n_marks_since_last_pause = 0; | |
1509 | |
1510 // Update the efficiency-since-mark vars. | |
1511 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1512 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1513 // This usually happens due to the timer not having the required | |
1514 // granularity. Some Linuxes are the usual culprits. | |
1515 // We'll just set it to something (arbitrarily) small. | |
1516 proc_ms = 1.0; | |
1517 } | |
1518 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1519 | |
1520 bool new_in_marking_window = _in_marking_window; | |
1521 bool new_in_marking_window_im = false; | |
1359
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1522 if (during_initial_mark_pause()) { |
342 | 1523 new_in_marking_window = true; |
1524 new_in_marking_window_im = true; | |
1525 } | |
1526 | |
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1527 if (_last_full_young_gc) { |
3914
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1528 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1529 "start partially-young GCs", |
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1530 ergo_format_byte_perc("known garbage"), |
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1531 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
3867
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1532 set_full_young_gcs(false); |
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1533 _last_full_young_gc = false; |
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1534 } |
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1535 |
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1536 if ( !_last_young_gc_full ) { |
3914
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1537 if (_should_revert_to_full_young_gcs) { |
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1538 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1539 "end partially-young GCs", |
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1540 ergo_format_reason("partially-young GCs end requested") |
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1541 ergo_format_byte_perc("known garbage"), |
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1542 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1543 set_full_young_gcs(true); |
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1544 } else if (_known_garbage_ratio < 0.05) { |
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1545 ergo_verbose3(ErgoPartiallyYoungGCs, |
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|
1546 "end partially-young GCs", |
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|
1547 ergo_format_reason("known garbage percent lower than threshold") |
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1548 ergo_format_byte_perc("known garbage") |
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|
1549 ergo_format_perc("threshold"), |
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1550 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
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|
1551 0.05 * 100.0); |
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1552 set_full_young_gcs(true); |
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1553 } else if (adaptive_young_list_length() && |
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1554 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
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1555 ergo_verbose5(ErgoPartiallyYoungGCs, |
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1556 "end partially-young GCs", |
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1557 ergo_format_reason("current GC efficiency lower than " |
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1558 "predicted fully-young GC efficiency") |
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|
1559 ergo_format_double("GC efficiency factor") |
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|
1560 ergo_format_double("current GC efficiency") |
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1561 ergo_format_double("predicted fully-young GC efficiency") |
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|
1562 ergo_format_byte_perc("known garbage"), |
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1563 get_gc_eff_factor(), cur_efficiency, |
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|
1564 predict_young_gc_eff(), |
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1565 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1566 set_full_young_gcs(true); |
342 | 1567 } |
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1568 } |
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1569 _should_revert_to_full_young_gcs = false; |
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1570 |
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1571 if (_last_young_gc_full && !_during_marking) { |
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1572 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1573 } |
1574 | |
1575 _short_lived_surv_rate_group->start_adding_regions(); | |
1576 // do that for any other surv rate groupsx | |
1577 | |
1578 // <NEW PREDICTION> | |
1579 | |
677 | 1580 if (update_stats) { |
342 | 1581 double pause_time_ms = elapsed_ms; |
1582 | |
1583 size_t diff = 0; | |
1584 if (_max_pending_cards >= _pending_cards) | |
1585 diff = _max_pending_cards - _pending_cards; | |
1586 _pending_card_diff_seq->add((double) diff); | |
1587 | |
1588 double cost_per_card_ms = 0.0; | |
1589 if (_pending_cards > 0) { | |
1590 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1591 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1592 } | |
1593 | |
1594 size_t cards_scanned = _g1->cards_scanned(); | |
1595 | |
1596 double cost_per_entry_ms = 0.0; | |
1597 if (cards_scanned > 10) { | |
1598 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1599 if (_last_young_gc_full) | |
1600 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1601 else | |
1602 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1603 } | |
1604 | |
1605 if (_max_rs_lengths > 0) { | |
1606 double cards_per_entry_ratio = | |
1607 (double) cards_scanned / (double) _max_rs_lengths; | |
1608 if (_last_young_gc_full) | |
1609 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1610 else | |
1611 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1612 } | |
1613 | |
1614 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1615 if (rs_length_diff >= 0) | |
1616 _rs_length_diff_seq->add((double) rs_length_diff); | |
1617 | |
1618 size_t copied_bytes = surviving_bytes; | |
1619 double cost_per_byte_ms = 0.0; | |
1620 if (copied_bytes > 0) { | |
1621 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1622 if (_in_marking_window) | |
1623 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1624 else | |
1625 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1626 } | |
1627 | |
1628 double all_other_time_ms = pause_time_ms - | |
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1629 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1630 _mark_closure_time_ms + termination_time); |
1631 | |
1632 double young_other_time_ms = 0.0; | |
1633 if (_recorded_young_regions > 0) { | |
1634 young_other_time_ms = | |
1635 _recorded_young_cset_choice_time_ms + | |
1636 _recorded_young_free_cset_time_ms; | |
1637 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1638 (double) _recorded_young_regions); | |
1639 } | |
1640 double non_young_other_time_ms = 0.0; | |
1641 if (_recorded_non_young_regions > 0) { | |
1642 non_young_other_time_ms = | |
1643 _recorded_non_young_cset_choice_time_ms + | |
1644 _recorded_non_young_free_cset_time_ms; | |
1645 | |
1646 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1647 (double) _recorded_non_young_regions); | |
1648 } | |
1649 | |
1650 double constant_other_time_ms = all_other_time_ms - | |
1651 (young_other_time_ms + non_young_other_time_ms); | |
1652 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1653 | |
1654 double survival_ratio = 0.0; | |
1655 if (_bytes_in_collection_set_before_gc > 0) { | |
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1656 survival_ratio = (double) _bytes_copied_during_gc / |
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1657 (double) _bytes_in_collection_set_before_gc; |
342 | 1658 } |
1659 | |
1660 _pending_cards_seq->add((double) _pending_cards); | |
1661 _scanned_cards_seq->add((double) cards_scanned); | |
1662 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1663 | |
1664 double expensive_region_limit_ms = | |
751 | 1665 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1666 if (expensive_region_limit_ms < 0.0) { |
1667 // this means that the other time was predicted to be longer than | |
1668 // than the max pause time | |
751 | 1669 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1670 } |
1671 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1672 | |
1673 if (PREDICTIONS_VERBOSE) { | |
1674 gclog_or_tty->print_cr(""); | |
1675 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1676 "REGIONS %d %d %d " |
342 | 1677 "PENDING_CARDS %d %d " |
1678 "CARDS_SCANNED %d %d " | |
1679 "RS_LENGTHS %d %d " | |
1680 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1681 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1682 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1683 "OTHER_YOUNG %1.6lf %1.6lf " | |
1684 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1685 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1686 "ELAPSED %1.6lf %1.6lf ", | |
1687 _cur_collection_start_sec, | |
1688 (!_last_young_gc_full) ? 2 : | |
1689 (last_pause_included_initial_mark) ? 1 : 0, | |
1690 _recorded_region_num, | |
1691 _recorded_young_regions, | |
1692 _recorded_non_young_regions, | |
1693 _predicted_pending_cards, _pending_cards, | |
1694 _predicted_cards_scanned, cards_scanned, | |
1695 _predicted_rs_lengths, _max_rs_lengths, | |
1696 _predicted_rs_update_time_ms, update_rs_time, | |
1697 _predicted_rs_scan_time_ms, scan_rs_time, | |
1698 _predicted_survival_ratio, survival_ratio, | |
1699 _predicted_object_copy_time_ms, obj_copy_time, | |
1700 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1701 _predicted_young_other_time_ms, young_other_time_ms, | |
1702 _predicted_non_young_other_time_ms, | |
1703 non_young_other_time_ms, | |
1704 _vtime_diff_ms, termination_time, | |
1705 _predicted_pause_time_ms, elapsed_ms); | |
1706 } | |
1707 | |
1708 if (G1PolicyVerbose > 0) { | |
1709 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1710 _predicted_pause_time_ms, | |
1711 (_within_target) ? "within" : "outside", | |
1712 elapsed_ms); | |
1713 } | |
1714 | |
1715 } | |
1716 | |
1717 _in_marking_window = new_in_marking_window; | |
1718 _in_marking_window_im = new_in_marking_window_im; | |
1719 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1720 update_young_list_target_length(); |
342 | 1721 |
1111 | 1722 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1723 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1724 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1725 // </NEW PREDICTION> |
1726 } | |
1727 | |
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1728 #define EXT_SIZE_FORMAT "%d%s" |
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1729 #define EXT_SIZE_PARAMS(bytes) \ |
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1730 byte_size_in_proper_unit((bytes)), \ |
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1731 proper_unit_for_byte_size((bytes)) |
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1732 |
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1733 void G1CollectorPolicy::print_heap_transition() { |
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1734 if (PrintGCDetails) { |
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1735 YoungList* young_list = _g1->young_list(); |
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1736 size_t eden_bytes = young_list->eden_used_bytes(); |
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1737 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1738 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1739 size_t used = _g1->used(); |
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1740 size_t capacity = _g1->capacity(); |
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1741 size_t eden_capacity = |
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1742 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1743 |
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1744 gclog_or_tty->print_cr( |
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1745 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1746 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1747 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1748 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1749 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1750 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1751 EXT_SIZE_PARAMS(eden_bytes), |
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1752 EXT_SIZE_PARAMS(eden_capacity), |
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1753 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1754 EXT_SIZE_PARAMS(survivor_bytes), |
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1755 EXT_SIZE_PARAMS(used_before_gc), |
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1756 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1757 EXT_SIZE_PARAMS(used), |
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1758 EXT_SIZE_PARAMS(capacity)); |
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1759 |
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1760 _prev_eden_capacity = eden_capacity; |
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1761 } else if (PrintGC) { |
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1762 _g1->print_size_transition(gclog_or_tty, |
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1763 _cur_collection_pause_used_at_start_bytes, |
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1764 _g1->used(), _g1->capacity()); |
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1765 } |
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1766 } |
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1767 |
342 | 1768 // <NEW PREDICTION> |
1769 | |
1111 | 1770 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1771 double update_rs_processed_buffers, | |
1772 double goal_ms) { | |
1773 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1774 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1775 | |
1282 | 1776 if (G1UseAdaptiveConcRefinement) { |
1111 | 1777 const int k_gy = 3, k_gr = 6; |
1778 const double inc_k = 1.1, dec_k = 0.9; | |
1779 | |
1780 int g = cg1r->green_zone(); | |
1781 if (update_rs_time > goal_ms) { | |
1782 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1783 } else { | |
1784 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1785 g = (int)MAX2(g * inc_k, g + 1.0); | |
1786 } | |
1787 } | |
1788 // Change the refinement threads params | |
1789 cg1r->set_green_zone(g); | |
1790 cg1r->set_yellow_zone(g * k_gy); | |
1791 cg1r->set_red_zone(g * k_gr); | |
1792 cg1r->reinitialize_threads(); | |
1793 | |
1794 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1795 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1796 cg1r->yellow_zone()); | |
1797 // Change the barrier params | |
1798 dcqs.set_process_completed_threshold(processing_threshold); | |
1799 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1800 } | |
1801 | |
1802 int curr_queue_size = dcqs.completed_buffers_num(); | |
1803 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1804 dcqs.set_completed_queue_padding(curr_queue_size); | |
1805 } else { | |
1806 dcqs.set_completed_queue_padding(0); | |
1807 } | |
1808 dcqs.notify_if_necessary(); | |
1809 } | |
1810 | |
342 | 1811 double |
1812 G1CollectorPolicy:: | |
1813 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1814 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1815 | |
1816 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1817 size_t young_num = g1h->young_list()->length(); |
342 | 1818 if (young_num == 0) |
1819 return 0.0; | |
1820 | |
1821 young_num += adjustment; | |
1822 size_t pending_cards = predict_pending_cards(); | |
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1823 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1824 predict_rs_length_diff(); |
1825 size_t card_num; | |
1826 if (full_young_gcs()) | |
1827 card_num = predict_young_card_num(rs_lengths); | |
1828 else | |
1829 card_num = predict_non_young_card_num(rs_lengths); | |
1830 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1831 double accum_yg_surv_rate = | |
1832 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1833 | |
1834 size_t bytes_to_copy = | |
1835 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1836 | |
1837 return | |
1838 predict_rs_update_time_ms(pending_cards) + | |
1839 predict_rs_scan_time_ms(card_num) + | |
1840 predict_object_copy_time_ms(bytes_to_copy) + | |
1841 predict_young_other_time_ms(young_num) + | |
1842 predict_constant_other_time_ms(); | |
1843 } | |
1844 | |
1845 double | |
1846 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1847 size_t rs_length = predict_rs_length_diff(); | |
1848 size_t card_num; | |
1849 if (full_young_gcs()) | |
1850 card_num = predict_young_card_num(rs_length); | |
1851 else | |
1852 card_num = predict_non_young_card_num(rs_length); | |
1853 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1854 } | |
1855 | |
1856 double | |
1857 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1858 size_t scanned_cards) { | |
1859 return | |
1860 predict_rs_update_time_ms(pending_cards) + | |
1861 predict_rs_scan_time_ms(scanned_cards) + | |
1862 predict_constant_other_time_ms(); | |
1863 } | |
1864 | |
1865 double | |
1866 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1867 bool young) { | |
1868 size_t rs_length = hr->rem_set()->occupied(); | |
1869 size_t card_num; | |
1870 if (full_young_gcs()) | |
1871 card_num = predict_young_card_num(rs_length); | |
1872 else | |
1873 card_num = predict_non_young_card_num(rs_length); | |
1874 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1875 | |
1876 double region_elapsed_time_ms = | |
1877 predict_rs_scan_time_ms(card_num) + | |
1878 predict_object_copy_time_ms(bytes_to_copy); | |
1879 | |
1880 if (young) | |
1881 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1882 else | |
1883 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1884 | |
1885 return region_elapsed_time_ms; | |
1886 } | |
1887 | |
1888 size_t | |
1889 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1890 size_t bytes_to_copy; | |
1891 if (hr->is_marked()) | |
1892 bytes_to_copy = hr->max_live_bytes(); | |
1893 else { | |
1894 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1895 "invariant" ); | |
1896 int age = hr->age_in_surv_rate_group(); | |
545 | 1897 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1898 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1899 } | |
1900 | |
1901 return bytes_to_copy; | |
1902 } | |
1903 | |
1904 void | |
1905 G1CollectorPolicy::start_recording_regions() { | |
1906 _recorded_rs_lengths = 0; | |
1907 _recorded_young_regions = 0; | |
1908 _recorded_non_young_regions = 0; | |
1909 | |
1910 #if PREDICTIONS_VERBOSE | |
1911 _recorded_marked_bytes = 0; | |
1912 _recorded_young_bytes = 0; | |
1913 _predicted_bytes_to_copy = 0; | |
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1914 _predicted_rs_lengths = 0; |
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1915 _predicted_cards_scanned = 0; |
342 | 1916 #endif // PREDICTIONS_VERBOSE |
1917 } | |
1918 | |
1919 void | |
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1920 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1921 #if PREDICTIONS_VERBOSE |
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1922 if (!young) { |
342 | 1923 _recorded_marked_bytes += hr->max_live_bytes(); |
1924 } | |
1925 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1926 #endif // PREDICTIONS_VERBOSE | |
1927 | |
1928 size_t rs_length = hr->rem_set()->occupied(); | |
1929 _recorded_rs_lengths += rs_length; | |
1930 } | |
1931 | |
1932 void | |
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1933 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1934 assert(!hr->is_young(), "should not call this"); |
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1935 ++_recorded_non_young_regions; |
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1936 record_cset_region_info(hr, false); |
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1937 } |
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1938 |
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1939 void |
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1940 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1941 _recorded_young_regions = n_regions; |
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1942 } |
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1943 |
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1944 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1945 #if PREDICTIONS_VERBOSE |
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1946 _recorded_young_bytes = bytes; |
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1947 #endif // PREDICTIONS_VERBOSE |
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1948 } |
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1949 |
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1950 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1951 _recorded_rs_lengths = rs_lengths; |
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1952 } |
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1953 |
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1954 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1955 _predicted_bytes_to_copy = bytes; |
342 | 1956 } |
1957 | |
1958 void | |
1959 G1CollectorPolicy::end_recording_regions() { | |
1394
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1960 // The _predicted_pause_time_ms field is referenced in code |
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1961 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1962 _predicted_pause_time_ms = -1.0; |
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1963 |
342 | 1964 #if PREDICTIONS_VERBOSE |
1965 _predicted_pending_cards = predict_pending_cards(); | |
1966 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1967 if (full_young_gcs()) | |
1968 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1969 else | |
1970 _predicted_cards_scanned += | |
1971 predict_non_young_card_num(_predicted_rs_lengths); | |
1972 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1973 | |
1974 _predicted_rs_update_time_ms = | |
1975 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1976 _predicted_rs_scan_time_ms = | |
1977 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1978 _predicted_object_copy_time_ms = | |
1979 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1980 _predicted_constant_other_time_ms = | |
1981 predict_constant_other_time_ms(); | |
1982 _predicted_young_other_time_ms = | |
1983 predict_young_other_time_ms(_recorded_young_regions); | |
1984 _predicted_non_young_other_time_ms = | |
1985 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1986 | |
1987 _predicted_pause_time_ms = | |
1988 _predicted_rs_update_time_ms + | |
1989 _predicted_rs_scan_time_ms + | |
1990 _predicted_object_copy_time_ms + | |
1991 _predicted_constant_other_time_ms + | |
1992 _predicted_young_other_time_ms + | |
1993 _predicted_non_young_other_time_ms; | |
1994 #endif // PREDICTIONS_VERBOSE | |
1995 } | |
1996 | |
1997 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1998 predicted_time_ms) { | |
1999 // I don't think we need to do this when in young GC mode since | |
2000 // marking will be initiated next time we hit the soft limit anyway... | |
2001 if (predicted_time_ms > _expensive_region_limit_ms) { | |
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2002 ergo_verbose2(ErgoPartiallyYoungGCs, |
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2003 "request partially-young GCs end", |
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2004 ergo_format_reason("predicted region time higher than threshold") |
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2005 ergo_format_ms("predicted region time") |
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2006 ergo_format_ms("threshold"), |
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2007 predicted_time_ms, _expensive_region_limit_ms); |
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2008 // no point in doing another partial one |
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2009 _should_revert_to_full_young_gcs = true; |
342 | 2010 } |
2011 } | |
2012 | |
2013 // </NEW PREDICTION> | |
2014 | |
2015 | |
2016 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
2017 double elapsed_ms) { | |
2018 _recent_gc_times_ms->add(elapsed_ms); | |
2019 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
2020 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
2021 } | |
2022 | |
2023 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
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2024 if (_recent_pause_times_ms->num() == 0) { |
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2025 return (double) MaxGCPauseMillis; |
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2026 } |
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2027 return _recent_pause_times_ms->avg(); |
342 | 2028 } |
2029 | |
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2030 double G1CollectorPolicy::recent_avg_time_for_rs_scan_ms() { |
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2031 if (_recent_rs_scan_times_ms->num() == 0) { |
751 | 2032 return (double)MaxGCPauseMillis/3.0; |
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2033 } |
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2034 return _recent_rs_scan_times_ms->avg(); |
342 | 2035 } |
2036 | |
2037 int G1CollectorPolicy::number_of_recent_gcs() { | |
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2038 assert(_recent_rs_scan_times_ms->num() == |
342 | 2039 _recent_pause_times_ms->num(), "Sequence out of sync"); |
2040 assert(_recent_pause_times_ms->num() == | |
2041 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
2042 assert(_recent_CS_bytes_used_before->num() == | |
2043 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
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2044 |
342 | 2045 return _recent_pause_times_ms->num(); |
2046 } | |
2047 | |
2048 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
2049 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
2050 _recent_CS_bytes_used_before); | |
2051 } | |
2052 | |
2053 double G1CollectorPolicy::last_survival_fraction() { | |
2054 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
2055 _recent_CS_bytes_used_before); | |
2056 } | |
2057 | |
2058 double | |
2059 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
2060 TruncatedSeq* before) { | |
2061 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2062 if (before->sum() > 0.0) { | |
2063 double recent_survival_rate = surviving->sum() / before->sum(); | |
2064 // We exempt parallel collection from this check because Alloc Buffer | |
2065 // fragmentation can produce negative collections. | |
2066 // Further, we're now always doing parallel collection. But I'm still | |
2067 // leaving this here as a placeholder for a more precise assertion later. | |
2068 // (DLD, 10/05.) | |
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2069 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2070 _g1->evacuation_failed() || |
2071 recent_survival_rate <= 1.0, "Or bad frac"); | |
2072 return recent_survival_rate; | |
2073 } else { | |
2074 return 1.0; // Be conservative. | |
2075 } | |
2076 } | |
2077 | |
2078 double | |
2079 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2080 TruncatedSeq* before) { | |
2081 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2082 if (surviving->num() > 0 && before->last() > 0.0) { | |
2083 double last_survival_rate = surviving->last() / before->last(); | |
2084 // We exempt parallel collection from this check because Alloc Buffer | |
2085 // fragmentation can produce negative collections. | |
2086 // Further, we're now always doing parallel collection. But I'm still | |
2087 // leaving this here as a placeholder for a more precise assertion later. | |
2088 // (DLD, 10/05.) | |
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2089 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2090 last_survival_rate <= 1.0, "Or bad frac"); |
2091 return last_survival_rate; | |
2092 } else { | |
2093 return 1.0; | |
2094 } | |
2095 } | |
2096 | |
2097 static const int survival_min_obs = 5; | |
2098 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2099 static const double min_survival_rate = 0.1; | |
2100 | |
2101 double | |
2102 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2103 double latest) { | |
2104 double res = avg; | |
2105 if (number_of_recent_gcs() < survival_min_obs) { | |
2106 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2107 } | |
2108 res = MAX2(res, latest); | |
2109 res = MAX2(res, min_survival_rate); | |
2110 // In the parallel case, LAB fragmentation can produce "negative | |
2111 // collections"; so can evac failure. Cap at 1.0 | |
2112 res = MIN2(res, 1.0); | |
2113 return res; | |
2114 } | |
2115 | |
2116 size_t G1CollectorPolicy::expansion_amount() { | |
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2117 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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2118 double threshold = _gc_overhead_perc; |
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2119 if (recent_gc_overhead > threshold) { |
751 | 2120 // We will double the existing space, or take |
2121 // G1ExpandByPercentOfAvailable % of the available expansion | |
2122 // space, whichever is smaller, bounded below by a minimum | |
2123 // expansion (unless that's all that's left.) | |
342 | 2124 const size_t min_expand_bytes = 1*M; |
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2125 size_t reserved_bytes = _g1->max_capacity(); |
342 | 2126 size_t committed_bytes = _g1->capacity(); |
2127 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2128 size_t expand_bytes; | |
2129 size_t expand_bytes_via_pct = | |
751 | 2130 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2131 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2132 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2133 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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2134 |
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2135 ergo_verbose5(ErgoHeapSizing, |
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2136 "attempt heap expansion", |
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2137 ergo_format_reason("recent GC overhead higher than " |
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2138 "threshold after GC") |
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2139 ergo_format_perc("recent GC overhead") |
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2140 ergo_format_perc("threshold") |
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2141 ergo_format_byte("uncommitted") |
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2142 ergo_format_byte_perc("calculated expansion amount"), |
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2143 recent_gc_overhead, threshold, |
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2144 uncommitted_bytes, |
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2145 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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2146 |
342 | 2147 return expand_bytes; |
2148 } else { | |
2149 return 0; | |
2150 } | |
2151 } | |
2152 | |
2153 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2154 _mark_thread_startup_sec = os::elapsedTime(); | |
2155 } | |
2156 | |
2157 class CountCSClosure: public HeapRegionClosure { | |
2158 G1CollectorPolicy* _g1_policy; | |
2159 public: | |
2160 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2161 _g1_policy(g1_policy) {} | |
2162 bool doHeapRegion(HeapRegion* r) { | |
2163 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2164 return false; | |
2165 } | |
2166 }; | |
2167 | |
2168 void G1CollectorPolicy::count_CS_bytes_used() { | |
2169 CountCSClosure cs_closure(this); | |
2170 _g1->collection_set_iterate(&cs_closure); | |
2171 } | |
2172 | |
2173 void G1CollectorPolicy::print_summary (int level, | |
2174 const char* str, | |
2175 NumberSeq* seq) const { | |
2176 double sum = seq->sum(); | |
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2177 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 2178 str, sum / 1000.0, seq->avg()); |
2179 } | |
2180 | |
2181 void G1CollectorPolicy::print_summary_sd (int level, | |
2182 const char* str, | |
2183 NumberSeq* seq) const { | |
2184 print_summary(level, str, seq); | |
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2185 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 2186 seq->num(), seq->sd(), seq->maximum()); |
2187 } | |
2188 | |
2189 void G1CollectorPolicy::check_other_times(int level, | |
2190 NumberSeq* other_times_ms, | |
2191 NumberSeq* calc_other_times_ms) const { | |
2192 bool should_print = false; | |
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2193 LineBuffer buf(level + 2); |
342 | 2194 |
2195 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2196 fabs(calc_other_times_ms->sum())); | |
2197 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2198 fabs(calc_other_times_ms->sum())); | |
2199 double sum_ratio = max_sum / min_sum; | |
2200 if (sum_ratio > 1.1) { | |
2201 should_print = true; | |
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2202 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 2203 } |
2204 | |
2205 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2206 fabs(calc_other_times_ms->avg())); | |
2207 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2208 fabs(calc_other_times_ms->avg())); | |
2209 double avg_ratio = max_avg / min_avg; | |
2210 if (avg_ratio > 1.1) { | |
2211 should_print = true; | |
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2212 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 2213 } |
2214 | |
2215 if (other_times_ms->sum() < -0.01) { | |
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2216 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 2217 } |
2218 | |
2219 if (other_times_ms->avg() < -0.01) { | |
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2220 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 2221 } |
2222 | |
2223 if (calc_other_times_ms->sum() < -0.01) { | |
2224 should_print = true; | |
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2225 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 2226 } |
2227 | |
2228 if (calc_other_times_ms->avg() < -0.01) { | |
2229 should_print = true; | |
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2230 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 2231 } |
2232 | |
2233 if (should_print) | |
2234 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2235 } | |
2236 | |
2237 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2238 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2239 MainBodySummary* body_summary = summary->main_body_summary(); |
2240 if (summary->get_total_seq()->num() > 0) { | |
677 | 2241 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2242 if (body_summary != NULL) { |
2243 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2244 if (parallel) { | |
2245 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2246 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2247 print_summary(2, "Ext Root Scanning", | |
2248 body_summary->get_ext_root_scan_seq()); | |
2249 print_summary(2, "Mark Stack Scanning", | |
2250 body_summary->get_mark_stack_scan_seq()); | |
2251 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2252 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2253 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2254 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2255 { | |
2256 NumberSeq* other_parts[] = { | |
2257 body_summary->get_update_rs_seq(), | |
2258 body_summary->get_ext_root_scan_seq(), | |
2259 body_summary->get_mark_stack_scan_seq(), | |
2260 body_summary->get_scan_rs_seq(), | |
2261 body_summary->get_obj_copy_seq(), | |
2262 body_summary->get_termination_seq() | |
2263 }; | |
2264 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2265 6, other_parts); |
342 | 2266 check_other_times(2, body_summary->get_parallel_other_seq(), |
2267 &calc_other_times_ms); | |
2268 } | |
2269 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2270 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2271 } else { | |
2272 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2273 print_summary(1, "Ext Root Scanning", | |
2274 body_summary->get_ext_root_scan_seq()); | |
2275 print_summary(1, "Mark Stack Scanning", | |
2276 body_summary->get_mark_stack_scan_seq()); | |
2277 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2278 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2279 } | |
2280 } | |
2281 print_summary(1, "Other", summary->get_other_seq()); | |
2282 { | |
1779 | 2283 if (body_summary != NULL) { |
2284 NumberSeq calc_other_times_ms; | |
2285 if (parallel) { | |
2286 // parallel | |
2287 NumberSeq* other_parts[] = { | |
2288 body_summary->get_satb_drain_seq(), | |
2289 body_summary->get_parallel_seq(), | |
2290 body_summary->get_clear_ct_seq() | |
2291 }; | |
2292 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2293 3, other_parts); | |
2294 } else { | |
2295 // serial | |
2296 NumberSeq* other_parts[] = { | |
2297 body_summary->get_satb_drain_seq(), | |
2298 body_summary->get_update_rs_seq(), | |
2299 body_summary->get_ext_root_scan_seq(), | |
2300 body_summary->get_mark_stack_scan_seq(), | |
2301 body_summary->get_scan_rs_seq(), | |
2302 body_summary->get_obj_copy_seq() | |
2303 }; | |
2304 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2305 6, other_parts); | |
2306 } | |
2307 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2308 } |
2309 } | |
2310 } else { | |
2363
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7022943: G1: improve logging to avoid interleaved numbers
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2188
diff
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|
2311 LineBuffer(1).append_and_print_cr("none"); |
342 | 2312 } |
2363
c93aa6caa02f
7022943: G1: improve logging to avoid interleaved numbers
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|
2313 LineBuffer(0).append_and_print_cr(""); |
342 | 2314 } |
2315 | |
2316 void G1CollectorPolicy::print_tracing_info() const { | |
2317 if (TraceGen0Time) { | |
2318 gclog_or_tty->print_cr("ALL PAUSES"); | |
2319 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2320 gclog_or_tty->print_cr(""); | |
2321 gclog_or_tty->print_cr(""); | |
2322 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2323 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2324 gclog_or_tty->print_cr(""); | |
2325 | |
677 | 2326 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2327 print_summary(_summary); | |
342 | 2328 |
2329 gclog_or_tty->print_cr("MISC"); | |
2330 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2331 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2332 for (int i = 0; i < _aux_num; ++i) { | |
2333 if (_all_aux_times_ms[i].num() > 0) { | |
2334 char buffer[96]; | |
2335 sprintf(buffer, "Aux%d", i); | |
2336 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2337 } | |
2338 } | |
2339 | |
2340 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2341 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2342 "Tenured %8d (%6.2lf%%)", | |
2343 all_region_num, | |
2344 _region_num_young, | |
2345 (double) _region_num_young / (double) all_region_num * 100.0, | |
2346 _region_num_tenured, | |
2347 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2348 } | |
2349 if (TraceGen1Time) { | |
2350 if (_all_full_gc_times_ms->num() > 0) { | |
2351 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2352 _all_full_gc_times_ms->num(), | |
2353 _all_full_gc_times_ms->sum() / 1000.0); | |
2354 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2355 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2356 _all_full_gc_times_ms->sd(), | |
2357 _all_full_gc_times_ms->maximum()); | |
2358 } | |
2359 } | |
2360 } | |
2361 | |
2362 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2363 #ifndef PRODUCT | |
2364 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2365 // add this call for any other surv rate groups | |
2366 #endif // PRODUCT | |
2367 } | |
2368 | |
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2369 void G1CollectorPolicy::update_region_num(bool young) { |
1973 | 2370 if (young) { |
342 | 2371 ++_region_num_young; |
2372 } else { | |
2373 ++_region_num_tenured; | |
2374 } | |
2375 } | |
2376 | |
2377 #ifndef PRODUCT | |
2378 // for debugging, bit of a hack... | |
2379 static char* | |
2380 region_num_to_mbs(int length) { | |
2381 static char buffer[64]; | |
2382 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2383 double mbs = bytes / (double) (1024 * 1024); | |
2384 sprintf(buffer, "%7.2lfMB", mbs); | |
2385 return buffer; | |
2386 } | |
2387 #endif // PRODUCT | |
2388 | |
545 | 2389 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2390 switch (purpose) { |
2391 case GCAllocForSurvived: | |
545 | 2392 return _max_survivor_regions; |
342 | 2393 case GCAllocForTenured: |
545 | 2394 return REGIONS_UNLIMITED; |
342 | 2395 default: |
545 | 2396 ShouldNotReachHere(); |
2397 return REGIONS_UNLIMITED; | |
342 | 2398 }; |
2399 } | |
2400 | |
3919
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7084509: G1: fix inconsistencies and mistakes in the young list target length calculations
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2401 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
1991
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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|
2402 size_t expansion_region_num = 0; |
016a3628c885
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diff
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|
2403 if (GCLockerEdenExpansionPercent > 0) { |
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
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|
2404 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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diff
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|
2405 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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diff
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|
2406 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
016a3628c885
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diff
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|
2407 // less than 1.0) we'll get 1. |
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diff
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|
2408 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
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|
2409 } else { |
016a3628c885
6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
changeset
|
2410 assert(expansion_region_num == 0, "sanity"); |
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6994056: G1: when GC locker is active, extend the Eden instead of allocating into the old gen
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diff
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|
2411 } |
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diff
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|
2412 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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diff
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|
2413 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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diff
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|
2414 } |
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diff
changeset
|
2415 |
545 | 2416 // Calculates survivor space parameters. |
3919
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7084509: G1: fix inconsistencies and mistakes in the young list target length calculations
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|
2417 void G1CollectorPolicy::update_survivors_policy() { |
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7084509: G1: fix inconsistencies and mistakes in the young list target length calculations
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|
2418 double max_survivor_regions_d = |
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|
2419 (double) _young_list_target_length / (double) SurvivorRatio; |
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diff
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|
2420 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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|
2421 // smaller than 1.0) we'll get 1. |
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|
2422 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
4f41766176cf
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|
2423 |
3868
ae73da50be4b
7081064: G1: remove develop params G1FixedSurvivorSpaceSize, G1FixedTenuringThreshold, and G1FixedEdenSize
tonyp
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3867
diff
changeset
|
2424 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2425 HeapRegion::GrainWords * _max_survivor_regions); |
2426 } | |
2427 | |
342 | 2428 #ifndef PRODUCT |
2429 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2430 CollectionSetChooser* _chooser; | |
2431 public: | |
2432 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2433 _chooser(chooser) {} | |
2434 | |
2435 bool doHeapRegion(HeapRegion* r) { | |
2436 if (!r->continuesHumongous()) { | |
2437 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2438 } | |
2439 return false; | |
2440 } | |
2441 }; | |
2442 | |
2443 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2444 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2445 _g1->heap_region_iterate(&cl); | |
2446 return true; | |
2447 } | |
2448 #endif | |
2449 | |
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|
2450 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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|
2451 GCCause::Cause gc_cause) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2452 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2453 if (!during_cycle) { |
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|
2454 ergo_verbose1(ErgoConcCycles, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2455 "request concurrent cycle initiation", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2456 ergo_format_reason("requested by GC cause") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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diff
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|
2457 ergo_format_str("GC cause"), |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
changeset
|
2458 GCCause::to_string(gc_cause)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2459 set_initiate_conc_mark_if_possible(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
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|
2460 return true; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2461 } else { |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2462 ergo_verbose1(ErgoConcCycles, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2463 "do not request concurrent cycle initiation", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2464 ergo_format_reason("concurrent cycle already in progress") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2465 ergo_format_str("GC cause"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2466 GCCause::to_string(gc_cause)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2467 return false; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2468 } |
4e5661ba9d98
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1611
diff
changeset
|
2469 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2470 |
342 | 2471 void |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
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|
2472 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2473 // We are about to decide on whether this pause will be an |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2474 // initial-mark pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
2475 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
2476 // First, during_initial_mark_pause() should not be already set. We |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2477 // will set it here if we have to. However, it should be cleared by |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2478 // the end of the pause (it's only set for the duration of an |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2479 // initial-mark pause). |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2480 assert(!during_initial_mark_pause(), "pre-condition"); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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changeset
|
2481 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2482 if (initiate_conc_mark_if_possible()) { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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parents:
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diff
changeset
|
2483 // We had noticed on a previous pause that the heap occupancy has |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2484 // gone over the initiating threshold and we should start a |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2485 // concurrent marking cycle. So we might initiate one. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2486 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2487 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
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|
2488 if (!during_cycle) { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2489 // The concurrent marking thread is not "during a cycle", i.e., |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2490 // it has completed the last one. So we can go ahead and |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2491 // initiate a new cycle. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2492 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2493 set_during_initial_mark_pause(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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|
2494 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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|
2495 // And we can now clear initiate_conc_mark_if_possible() as |
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2496 // we've already acted on it. |
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2497 clear_initiate_conc_mark_if_possible(); |
3914
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2498 |
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2499 ergo_verbose0(ErgoConcCycles, |
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2500 "initiate concurrent cycle", |
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2501 ergo_format_reason("concurrent cycle initiation requested")); |
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2502 } else { |
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2503 // The concurrent marking thread is still finishing up the |
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2504 // previous cycle. If we start one right now the two cycles |
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2505 // overlap. In particular, the concurrent marking thread might |
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2506 // be in the process of clearing the next marking bitmap (which |
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2507 // we will use for the next cycle if we start one). Starting a |
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2508 // cycle now will be bad given that parts of the marking |
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2509 // information might get cleared by the marking thread. And we |
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2510 // cannot wait for the marking thread to finish the cycle as it |
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2511 // periodically yields while clearing the next marking bitmap |
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2512 // and, if it's in a yield point, it's waiting for us to |
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2513 // finish. So, at this point we will not start a cycle and we'll |
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2514 // let the concurrent marking thread complete the last one. |
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2515 ergo_verbose0(ErgoConcCycles, |
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2516 "do not initiate concurrent cycle", |
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2517 ergo_format_reason("concurrent cycle already in progress")); |
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2518 } |
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2519 } |
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2520 } |
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2521 |
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2522 void |
342 | 2523 G1CollectorPolicy_BestRegionsFirst:: |
2524 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2525 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2526 } | |
2527 | |
2528 class KnownGarbageClosure: public HeapRegionClosure { | |
2529 CollectionSetChooser* _hrSorted; | |
2530 | |
2531 public: | |
2532 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2533 _hrSorted(hrSorted) | |
2534 {} | |
2535 | |
2536 bool doHeapRegion(HeapRegion* r) { | |
2537 // We only include humongous regions in collection | |
2538 // sets when concurrent mark shows that their contained object is | |
2539 // unreachable. | |
2540 | |
2541 // Do we have any marking information for this region? | |
2542 if (r->is_marked()) { | |
2543 // We don't include humongous regions in collection | |
2544 // sets because we collect them immediately at the end of a marking | |
2545 // cycle. We also don't include young regions because we *must* | |
2546 // include them in the next collection pause. | |
2547 if (!r->isHumongous() && !r->is_young()) { | |
2548 _hrSorted->addMarkedHeapRegion(r); | |
2549 } | |
2550 } | |
2551 return false; | |
2552 } | |
2553 }; | |
2554 | |
2555 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2556 CollectionSetChooser* _hrSorted; | |
2557 jint _marked_regions_added; | |
2558 jint _chunk_size; | |
2559 jint _cur_chunk_idx; | |
2560 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2561 int _worker; | |
2562 int _invokes; | |
2563 | |
2564 void get_new_chunk() { | |
2565 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2566 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2567 } | |
2568 void add_region(HeapRegion* r) { | |
2569 if (_cur_chunk_idx == _cur_chunk_end) { | |
2570 get_new_chunk(); | |
2571 } | |
2572 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2573 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2574 _marked_regions_added++; | |
2575 _cur_chunk_idx++; | |
2576 } | |
2577 | |
2578 public: | |
2579 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2580 jint chunk_size, | |
2581 int worker) : | |
2582 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2583 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2584 _invokes(0) | |
2585 {} | |
2586 | |
2587 bool doHeapRegion(HeapRegion* r) { | |
2588 // We only include humongous regions in collection | |
2589 // sets when concurrent mark shows that their contained object is | |
2590 // unreachable. | |
2591 _invokes++; | |
2592 | |
2593 // Do we have any marking information for this region? | |
2594 if (r->is_marked()) { | |
2595 // We don't include humongous regions in collection | |
2596 // sets because we collect them immediately at the end of a marking | |
2597 // cycle. | |
2598 // We also do not include young regions in collection sets | |
2599 if (!r->isHumongous() && !r->is_young()) { | |
2600 add_region(r); | |
2601 } | |
2602 } | |
2603 return false; | |
2604 } | |
2605 jint marked_regions_added() { return _marked_regions_added; } | |
2606 int invokes() { return _invokes; } | |
2607 }; | |
2608 | |
2609 class ParKnownGarbageTask: public AbstractGangTask { | |
2610 CollectionSetChooser* _hrSorted; | |
2611 jint _chunk_size; | |
2612 G1CollectedHeap* _g1; | |
2613 public: | |
2614 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2615 AbstractGangTask("ParKnownGarbageTask"), | |
2616 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2617 _g1(G1CollectedHeap::heap()) | |
2618 {} | |
2619 | |
2620 void work(int i) { | |
2621 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2622 // Back to zero for the claim value. | |
355 | 2623 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2624 HeapRegion::InitialClaimValue); | |
342 | 2625 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2626 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2627 if (G1PrintParCleanupStats) { | |
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2628 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2629 i, parKnownGarbageCl.invokes(), regions_added); |
2630 } | |
2631 } | |
2632 }; | |
2633 | |
2634 void | |
2635 G1CollectorPolicy_BestRegionsFirst:: | |
2636 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2637 size_t max_live_bytes) { | |
2638 double start; | |
2639 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2640 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2641 | |
2642 _collectionSetChooser->clearMarkedHeapRegions(); | |
2643 double clear_marked_end; | |
2644 if (G1PrintParCleanupStats) { | |
2645 clear_marked_end = os::elapsedTime(); | |
2646 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2647 (clear_marked_end - start)*1000.0); | |
2648 } | |
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2649 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2650 const size_t OverpartitionFactor = 4; |
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2651 const size_t MinWorkUnit = 8; |
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2652 const size_t WorkUnit = |
342 | 2653 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2654 MinWorkUnit); |
342 | 2655 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2656 WorkUnit); |
342 | 2657 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2658 (int) WorkUnit); |
342 | 2659 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2660 |
2661 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2662 "sanity check"); | |
342 | 2663 } else { |
2664 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2665 _g1->heap_region_iterate(&knownGarbagecl); | |
2666 } | |
2667 double known_garbage_end; | |
2668 if (G1PrintParCleanupStats) { | |
2669 known_garbage_end = os::elapsedTime(); | |
2670 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2671 (known_garbage_end - clear_marked_end)*1000.0); | |
2672 } | |
2673 _collectionSetChooser->sortMarkedHeapRegions(); | |
2674 double sort_end; | |
2675 if (G1PrintParCleanupStats) { | |
2676 sort_end = os::elapsedTime(); | |
2677 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2678 (sort_end - known_garbage_end)*1000.0); | |
2679 } | |
2680 | |
2681 record_concurrent_mark_cleanup_end_work2(); | |
2682 double work2_end; | |
2683 if (G1PrintParCleanupStats) { | |
2684 work2_end = os::elapsedTime(); | |
2685 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2686 (work2_end - sort_end)*1000.0); | |
2687 } | |
2688 } | |
2689 | |
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2690 // Add the heap region at the head of the non-incremental collection set |
342 | 2691 void G1CollectorPolicy:: |
2692 add_to_collection_set(HeapRegion* hr) { | |
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2693 assert(_inc_cset_build_state == Active, "Precondition"); |
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2694 assert(!hr->is_young(), "non-incremental add of young region"); |
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2695 |
342 | 2696 if (_g1->mark_in_progress()) |
2697 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2698 | |
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2699 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2700 hr->set_in_collection_set(true); |
2701 hr->set_next_in_collection_set(_collection_set); | |
2702 _collection_set = hr; | |
2703 _collection_set_size++; | |
2704 _collection_set_bytes_used_before += hr->used(); | |
526 | 2705 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2706 } |
2707 | |
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2708 // Initialize the per-collection-set information |
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2709 void G1CollectorPolicy::start_incremental_cset_building() { |
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2710 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2711 |
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2712 _inc_cset_head = NULL; |
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2713 _inc_cset_tail = NULL; |
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2714 _inc_cset_size = 0; |
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2715 _inc_cset_bytes_used_before = 0; |
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2716 |
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2717 _inc_cset_young_index = 0; |
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2718 |
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2719 _inc_cset_max_finger = 0; |
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2720 _inc_cset_recorded_young_bytes = 0; |
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2721 _inc_cset_recorded_rs_lengths = 0; |
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2722 _inc_cset_predicted_elapsed_time_ms = 0; |
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2723 _inc_cset_predicted_bytes_to_copy = 0; |
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2724 _inc_cset_build_state = Active; |
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2725 } |
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2726 |
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2727 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2728 // This routine is used when: |
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2729 // * adding survivor regions to the incremental cset at the end of an |
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2730 // evacuation pause, |
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2731 // * adding the current allocation region to the incremental cset |
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2732 // when it is retired, and |
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2733 // * updating existing policy information for a region in the |
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2734 // incremental cset via young list RSet sampling. |
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2735 // Therefore this routine may be called at a safepoint by the |
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2736 // VM thread, or in-between safepoints by mutator threads (when |
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2737 // retiring the current allocation region) or a concurrent |
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2738 // refine thread (RSet sampling). |
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|
2739 |
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2740 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2741 size_t used_bytes = hr->used(); |
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2742 |
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2743 _inc_cset_recorded_rs_lengths += rs_length; |
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|
2744 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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|
2745 |
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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
|
2746 _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:
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diff
changeset
|
2747 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2748 // 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
|
2749 // 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:
1391
diff
changeset
|
2750 // 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
|
2751 // 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
|
2752 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
|
2753 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
|
2754 |
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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
|
2755 #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
|
2756 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
|
2757 _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
|
2758 |
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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
|
2759 // 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
|
2760 _inc_cset_recorded_young_bytes += used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2761 |
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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
|
2762 // 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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diff
changeset
|
2763 // 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
|
2764 // 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
|
2765 // rset sampling code |
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parents:
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diff
changeset
|
2766 hr->set_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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changeset
|
2767 #endif // PREDICTIONS_VERBOSE |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2768 } |
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parents:
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diff
changeset
|
2769 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2770 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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changeset
|
2771 // This routine is currently only called as part of the updating of |
1316cec51b4d
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changeset
|
2772 // existing policy information for regions in the incremental cset that |
1316cec51b4d
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parents:
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changeset
|
2773 // is performed by the concurrent refine thread(s) as part of young list |
1316cec51b4d
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parents:
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diff
changeset
|
2774 // RSet sampling. Therefore we should not be at a safepoint. |
1316cec51b4d
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parents:
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diff
changeset
|
2775 |
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
|
2776 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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changeset
|
2777 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
|
2778 |
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
|
2779 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:
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diff
changeset
|
2780 size_t old_rs_length = hr->recorded_rs_length(); |
1316cec51b4d
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parents:
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diff
changeset
|
2781 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
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parents:
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diff
changeset
|
2782 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2783 // 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
|
2784 // 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:
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diff
changeset
|
2785 _inc_cset_recorded_rs_lengths -= old_rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2786 _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:
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diff
changeset
|
2787 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2788 _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
|
2789 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2790 // 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
|
2791 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
|
2792 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
|
2793 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2794 #if PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2795 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2796 _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
|
2797 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2798 // 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
|
2799 _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
|
2800 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2801 // 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
|
2802 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
|
2803 #endif // PREDICTIONS_VERBOSE |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2804 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2805 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2806 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
|
2807 // 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
|
2808 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
|
2809 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2810 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
|
2811 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
|
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 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
|
2815 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
|
2816 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
|
2817 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
|
2818 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2819 // 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
|
2820 // 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
|
2821 // 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
|
2822 // 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
|
2823 // 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
|
2824 // 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
|
2825 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2826 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
|
2827 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
|
2828 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2829 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
|
2830 _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
|
2831 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2832 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
|
2833 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
|
2834 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
|
2835 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2836 _inc_cset_size++; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2837 _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
|
2838 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2839 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
|
2840 ++_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
|
2841 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2842 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2843 // 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
|
2844 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
|
2845 // 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
|
2846 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
|
2847 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2848 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2849 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
|
2850 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2851 // 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
|
2852 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
|
2853 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2854 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2855 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2856 _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
|
2857 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2858 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2859 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2860 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2861 // Add the region to the LHS of the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2862 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
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changeset
|
2863 // 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
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parents:
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changeset
|
2864 assert(!hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2865 |
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
|
2866 // 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
|
2867 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
|
2868 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2869 // Add the region at the left hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2870 hr->set_next_in_collection_set(_inc_cset_head); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2871 if (_inc_cset_head == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2872 assert(_inc_cset_tail == NULL, "Invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2873 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2874 } |
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
|
2875 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2876 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2877 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2878 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2879 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:
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diff
changeset
|
2880 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2881 |
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
|
2882 st->print_cr("\nCollection_set:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2883 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2884 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2885 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2886 assert(csr->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2887 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2888 "age: %4d, y: %d, surv: %d", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2889 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2890 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2891 csr->prev_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2892 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
|
2893 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
|
2894 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
|
2895 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2896 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2897 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2898 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2899 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2900 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2901 |
1707 | 2902 void |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2903 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2904 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
|
2905 // 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
|
2906 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
|
2907 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2908 YoungList* young_list = _g1->young_list(); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2909 |
342 | 2910 start_recording_regions(); |
2911 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2912 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2913 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
|
2914 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2915 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2916 |
2917 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2918 double predicted_pause_time_ms = base_time_ms; | |
2919 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2920 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2921 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2922 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2923 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2924 ergo_format_ms("predicted base time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2925 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2926 ergo_format_ms("target pause time"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2927 base_time_ms, time_remaining_ms, target_pause_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2928 |
342 | 2929 // the 10% and 50% values are arbitrary... |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2930 double threshold = 0.10 * target_pause_time_ms; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2931 if (time_remaining_ms < threshold) { |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2932 double prev_time_remaining_ms = time_remaining_ms; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2933 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2934 _within_target = false; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2935 ergo_verbose3(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2936 "adjust remaining time", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2937 ergo_format_reason("remaining time lower than threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2938 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2939 ergo_format_ms("threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2940 ergo_format_ms("adjusted remaining time"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2941 prev_time_remaining_ms, threshold, time_remaining_ms); |
342 | 2942 } else { |
2943 _within_target = true; | |
2944 } | |
2945 | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2946 size_t expansion_bytes = _g1->expansion_regions() * HeapRegion::GrainBytes; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2947 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2948 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2949 double young_start_time_sec = os::elapsedTime(); |
342 | 2950 |
677 | 2951 _collection_set_bytes_used_before = 0; |
2952 _collection_set_size = 0; | |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2953 _young_cset_length = 0; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2954 _last_young_gc_full = full_young_gcs() ? true : false; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2955 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2956 if (_last_young_gc_full) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2957 ++_full_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2958 } else { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2959 ++_partial_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2960 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2961 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2962 // The young list is laid with the survivor regions from the previous |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2963 // pause are appended to the RHS of the young list, i.e. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2964 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2965 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2966 size_t survivor_region_num = young_list->survivor_length(); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2967 size_t eden_region_num = young_list->length() - survivor_region_num; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2968 size_t old_region_num = 0; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2969 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2970 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2971 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2972 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2973 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2974 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2975 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2976 // Clear the fields that point to the survivor list - they are all young now. |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2977 young_list->clear_survivors(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2978 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2979 if (_g1->mark_in_progress()) |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2980 _g1->concurrent_mark()->register_collection_set_finger(_inc_cset_max_finger); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2981 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2982 _young_cset_length = _inc_cset_young_index; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2983 _collection_set = _inc_cset_head; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2984 _collection_set_size = _inc_cset_size; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2985 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2986 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2987 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2988 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2989 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2990 "add young regions to CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2991 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2992 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2993 ergo_format_ms("predicted young region time"), |
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2994 eden_region_num, survivor_region_num, |
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2995 _inc_cset_predicted_elapsed_time_ms); |
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2996 |
3867
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2997 // The number of recorded young regions is the incremental |
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2998 // collection set's current size |
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2999 set_recorded_young_regions(_inc_cset_size); |
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3000 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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3001 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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3002 #if PREDICTIONS_VERBOSE |
3867
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3003 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
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3004 #endif // PREDICTIONS_VERBOSE |
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3005 |
3914
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3006 assert(_inc_cset_size == young_list->length(), "Invariant"); |
3867
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3007 |
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3008 double young_end_time_sec = os::elapsedTime(); |
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3009 _recorded_young_cset_choice_time_ms = |
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3010 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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3011 |
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3012 // We are doing young collections so reset this. |
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3013 non_young_start_time_sec = young_end_time_sec; |
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3014 |
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3015 if (!full_young_gcs()) { |
342 | 3016 bool should_continue = true; |
3017 NumberSeq seq; | |
3018 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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3019 |
3914
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3020 size_t prev_collection_set_size = _collection_set_size; |
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3021 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
342 | 3022 do { |
3023 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
3024 avg_prediction); | |
677 | 3025 if (hr != NULL) { |
342 | 3026 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
3027 time_remaining_ms -= predicted_time_ms; | |
3028 predicted_pause_time_ms += predicted_time_ms; | |
3029 add_to_collection_set(hr); | |
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3030 record_non_young_cset_region(hr); |
342 | 3031 seq.add(predicted_time_ms); |
3032 avg_prediction = seq.avg() + seq.sd(); | |
3033 } | |
3914
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3034 |
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3035 should_continue = true; |
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3036 if (hr == NULL) { |
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3037 // No need for an ergo verbose message here, |
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3038 // getNextMarkRegion() does this when it returns NULL. |
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3039 should_continue = false; |
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3040 } else { |
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3041 if (adaptive_young_list_length()) { |
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3042 if (time_remaining_ms < 0.0) { |
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3043 ergo_verbose1(ErgoCSetConstruction, |
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3044 "stop adding old regions to CSet", |
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3045 ergo_format_reason("remaining time is lower than 0") |
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3046 ergo_format_ms("remaining time"), |
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|
3047 time_remaining_ms); |
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|
3048 should_continue = false; |
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3049 } |
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|
3050 } else { |
3927
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|
3051 if (_collection_set_size >= _young_list_fixed_length) { |
3914
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3052 ergo_verbose2(ErgoCSetConstruction, |
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|
3053 "stop adding old regions to CSet", |
3927
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3054 ergo_format_reason("CSet length reached target") |
3914
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3055 ergo_format_region("CSet") |
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3056 ergo_format_region("young target"), |
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|
3057 _collection_set_size, _young_list_fixed_length); |
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|
3058 should_continue = false; |
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|
3059 } |
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|
3060 } |
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|
3061 } |
342 | 3062 } while (should_continue); |
3063 | |
3064 if (!adaptive_young_list_length() && | |
3914
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3065 _collection_set_size < _young_list_fixed_length) { |
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|
3066 ergo_verbose2(ErgoCSetConstruction, |
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|
3067 "request partially-young GCs end", |
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|
3068 ergo_format_reason("CSet length lower than target") |
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|
3069 ergo_format_region("CSet") |
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|
3070 ergo_format_region("young target"), |
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|
3071 _collection_set_size, _young_list_fixed_length); |
342 | 3072 _should_revert_to_full_young_gcs = true; |
3914
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|
3073 } |
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|
3074 |
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|
3075 old_region_num = _collection_set_size - prev_collection_set_size; |
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|
3076 |
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|
3077 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
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|
3078 "add old regions to CSet", |
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|
3079 ergo_format_region("old") |
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|
3080 ergo_format_ms("predicted old region time"), |
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|
3081 old_region_num, |
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|
3082 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
342 | 3083 } |
3084 | |
1394
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|
3085 stop_incremental_cset_building(); |
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|
3086 |
342 | 3087 count_CS_bytes_used(); |
3088 | |
3089 end_recording_regions(); | |
3090 | |
3914
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|
3091 ergo_verbose5(ErgoCSetConstruction, |
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|
3092 "finish choosing CSet", |
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|
3093 ergo_format_region("eden") |
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|
3094 ergo_format_region("survivors") |
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|
3095 ergo_format_region("old") |
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|
3096 ergo_format_ms("predicted pause time") |
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|
3097 ergo_format_ms("target pause time"), |
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|
3098 eden_region_num, survivor_region_num, old_region_num, |
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|
3099 predicted_pause_time_ms, target_pause_time_ms); |
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|
3100 |
342 | 3101 double non_young_end_time_sec = os::elapsedTime(); |
3102 _recorded_non_young_cset_choice_time_ms = | |
3103 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3104 } | |
3105 | |
3106 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3107 G1CollectorPolicy::record_full_collection_end(); | |
3108 _collectionSetChooser->updateAfterFullCollection(); | |
3109 } | |
3110 | |
3111 void G1CollectorPolicy_BestRegionsFirst:: | |
1707 | 3112 record_collection_pause_end() { |
3113 G1CollectorPolicy::record_collection_pause_end(); | |
342 | 3114 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3115 } |