Mercurial > hg > graal-jvmci-8
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 3976:d912b598c6c3
7091032: G1: assert failure when NewRatio is used
Summary: The desired min / max heap sizes are miscalculated at initialization when NewRatio is used. The changeset also includes an additional small change to turn a print statement into a warning.
Reviewed-by: johnc, jmasa, ysr, brutisso
author | tonyp |
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date | Wed, 21 Sep 2011 13:36:37 -0400 |
parents | f1b4e0e0bdad |
children | 4dfb2df418f2 |
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 #ifndef PRODUCT |
342 | 156 _cur_clear_ct_time_ms(0.0), |
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157 _min_clear_cc_time_ms(-1.0), |
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158 _max_clear_cc_time_ms(-1.0), |
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159 _cur_clear_cc_time_ms(0.0), |
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160 _cum_clear_cc_time_ms(0.0), |
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161 _num_cc_clears(0L), |
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162 #endif |
342 | 163 |
164 _region_num_young(0), | |
165 _region_num_tenured(0), | |
166 _prev_region_num_young(0), | |
167 _prev_region_num_tenured(0), | |
168 | |
169 _aux_num(10), | |
170 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
171 _cur_aux_start_times_ms(new double[_aux_num]), | |
172 _cur_aux_times_ms(new double[_aux_num]), | |
173 _cur_aux_times_set(new bool[_aux_num]), | |
174 | |
175 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
176 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
177 | |
178 // <NEW PREDICTION> | |
179 | |
180 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
181 _prev_collection_pause_end_ms(0.0), | |
182 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
184 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
185 _fully_young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
186 _partially_young_cards_per_entry_ratio_seq( | |
187 new TruncatedSeq(TruncatedSeqLength)), | |
188 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
189 _partially_young_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
190 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
191 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
192 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
193 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
194 _non_young_other_cost_per_region_ms_seq( | |
195 new TruncatedSeq(TruncatedSeqLength)), | |
196 | |
197 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
198 _scanned_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
199 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
200 | |
751 | 201 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 202 |
203 // </NEW PREDICTION> | |
204 | |
205 _full_young_gcs(true), | |
206 _full_young_pause_num(0), | |
207 _partial_young_pause_num(0), | |
208 | |
209 _during_marking(false), | |
210 _in_marking_window(false), | |
211 _in_marking_window_im(false), | |
212 | |
213 _known_garbage_ratio(0.0), | |
214 _known_garbage_bytes(0), | |
215 | |
216 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
217 | |
218 _recent_prev_end_times_for_all_gcs_sec(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
219 | |
220 _recent_CS_bytes_used_before(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
221 _recent_CS_bytes_surviving(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
222 | |
223 _recent_avg_pause_time_ratio(0.0), | |
224 _num_markings(0), | |
225 _n_marks(0), | |
226 _n_pauses_at_mark_end(0), | |
227 | |
228 _all_full_gc_times_ms(new NumberSeq()), | |
229 | |
230 // G1PausesBtwnConcMark defaults to -1 | |
231 // so the hack is to do the cast QQQ FIXME | |
232 _pauses_btwn_concurrent_mark((size_t)G1PausesBtwnConcMark), | |
233 _n_marks_since_last_pause(0), | |
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234 _initiate_conc_mark_if_possible(false), |
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235 _during_initial_mark_pause(false), |
342 | 236 _should_revert_to_full_young_gcs(false), |
237 _last_full_young_gc(false), | |
238 | |
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239 _eden_bytes_before_gc(0), |
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240 _survivor_bytes_before_gc(0), |
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241 _capacity_before_gc(0), |
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242 |
342 | 243 _prev_collection_pause_used_at_end_bytes(0), |
244 | |
245 _collection_set(NULL), | |
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246 _collection_set_size(0), |
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247 _collection_set_bytes_used_before(0), |
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248 |
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249 // Incremental CSet attributes |
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250 _inc_cset_build_state(Inactive), |
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251 _inc_cset_head(NULL), |
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252 _inc_cset_tail(NULL), |
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253 _inc_cset_size(0), |
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254 _inc_cset_young_index(0), |
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255 _inc_cset_bytes_used_before(0), |
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256 _inc_cset_max_finger(NULL), |
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257 _inc_cset_recorded_young_bytes(0), |
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258 _inc_cset_recorded_rs_lengths(0), |
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259 _inc_cset_predicted_elapsed_time_ms(0.0), |
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260 _inc_cset_predicted_bytes_to_copy(0), |
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261 |
342 | 262 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
263 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
264 #endif // _MSC_VER | |
265 | |
266 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
267 G1YoungSurvRateNumRegionsSummary)), | |
268 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 269 G1YoungSurvRateNumRegionsSummary)), |
342 | 270 // add here any more surv rate groups |
545 | 271 _recorded_survivor_regions(0), |
272 _recorded_survivor_head(NULL), | |
273 _recorded_survivor_tail(NULL), | |
1356 | 274 _survivors_age_table(true), |
275 | |
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276 _gc_overhead_perc(0.0) { |
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277 |
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278 // Set up the region size and associated fields. Given that the |
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279 // policy is created before the heap, we have to set this up here, |
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280 // so it's done as soon as possible. |
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281 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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282 HeapRegionRemSet::setup_remset_size(); |
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283 |
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284 G1ErgoVerbose::initialize(); |
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285 if (PrintAdaptiveSizePolicy) { |
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286 // Currently, we only use a single switch for all the heuristics. |
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287 G1ErgoVerbose::set_enabled(true); |
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288 // Given that we don't currently have a verboseness level |
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289 // parameter, we'll hardcode this to high. This can be easily |
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290 // changed in the future. |
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291 G1ErgoVerbose::set_level(ErgoHigh); |
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292 } else { |
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293 G1ErgoVerbose::set_enabled(false); |
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294 } |
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295 |
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296 // Verify PLAB sizes |
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297 const uint region_size = HeapRegion::GrainWords; |
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298 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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299 char buffer[128]; |
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300 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most %u", |
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301 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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302 vm_exit_during_initialization(buffer); |
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303 } |
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304 |
342 | 305 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
306 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
307 | |
1611 | 308 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 309 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
310 _par_last_mark_stack_scan_times_ms = new double[_parallel_gc_threads]; | |
311 | |
312 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
313 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
314 | |
315 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
316 | |
317 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
318 | |
319 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 320 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
321 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 322 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
342 | 323 |
324 // start conservatively | |
751 | 325 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 326 |
327 // <NEW PREDICTION> | |
328 | |
329 int index; | |
330 if (ParallelGCThreads == 0) | |
331 index = 0; | |
332 else if (ParallelGCThreads > 8) | |
333 index = 7; | |
334 else | |
335 index = ParallelGCThreads - 1; | |
336 | |
337 _pending_card_diff_seq->add(0.0); | |
338 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
339 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
340 _fully_young_cards_per_entry_ratio_seq->add( | |
341 fully_young_cards_per_entry_ratio_defaults[index]); | |
342 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); | |
343 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
344 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
345 _young_other_cost_per_region_ms_seq->add( | |
346 young_other_cost_per_region_ms_defaults[index]); | |
347 _non_young_other_cost_per_region_ms_seq->add( | |
348 non_young_other_cost_per_region_ms_defaults[index]); | |
349 | |
350 // </NEW PREDICTION> | |
351 | |
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352 // Below, we might need to calculate the pause time target based on |
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353 // the pause interval. When we do so we are going to give G1 maximum |
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354 // flexibility and allow it to do pauses when it needs to. So, we'll |
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355 // arrange that the pause interval to be pause time target + 1 to |
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356 // ensure that a) the pause time target is maximized with respect to |
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357 // the pause interval and b) we maintain the invariant that pause |
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358 // time target < pause interval. If the user does not want this |
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359 // maximum flexibility, they will have to set the pause interval |
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360 // explicitly. |
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361 |
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362 // First make sure that, if either parameter is set, its value is |
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363 // reasonable. |
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364 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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365 if (MaxGCPauseMillis < 1) { |
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366 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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367 "greater than 0"); |
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368 } |
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369 } |
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370 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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371 if (GCPauseIntervalMillis < 1) { |
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372 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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373 "greater than 0"); |
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374 } |
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375 } |
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376 |
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377 // Then, if the pause time target parameter was not set, set it to |
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378 // the default value. |
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379 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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380 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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381 // The default pause time target in G1 is 200ms |
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382 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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383 } else { |
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384 // We do not allow the pause interval to be set without the |
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385 // pause time target |
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386 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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387 "without setting MaxGCPauseMillis"); |
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388 } |
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389 } |
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390 |
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391 // Then, if the interval parameter was not set, set it according to |
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392 // the pause time target (this will also deal with the case when the |
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393 // pause time target is the default value). |
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394 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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395 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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396 } |
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397 |
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398 // Finally, make sure that the two parameters are consistent. |
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399 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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400 char buffer[256]; |
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401 jio_snprintf(buffer, 256, |
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402 "MaxGCPauseMillis (%u) should be less than " |
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403 "GCPauseIntervalMillis (%u)", |
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404 MaxGCPauseMillis, GCPauseIntervalMillis); |
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405 vm_exit_during_initialization(buffer); |
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406 } |
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407 |
751 | 408 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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409 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 410 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 411 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 412 |
413 // start conservatively (around 50ms is about right) | |
414 _concurrent_mark_remark_times_ms->add(0.05); | |
415 _concurrent_mark_cleanup_times_ms->add(0.20); | |
416 _tenuring_threshold = MaxTenuringThreshold; | |
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417 // _max_survivor_regions will be calculated by |
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418 // update_young_list_target_length() during initialization. |
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419 _max_survivor_regions = 0; |
545 | 420 |
1356 | 421 assert(GCTimeRatio > 0, |
422 "we should have set it to a default value set_g1_gc_flags() " | |
423 "if a user set it to 0"); | |
424 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
425 | |
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426 uintx reserve_perc = G1ReservePercent; |
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427 // Put an artificial ceiling on this so that it's not set to a silly value. |
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428 if (reserve_perc > 50) { |
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429 reserve_perc = 50; |
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430 warning("G1ReservePercent is set to a value that is too large, " |
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431 "it's been updated to %u", reserve_perc); |
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432 } |
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433 _reserve_factor = (double) reserve_perc / 100.0; |
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434 // This will be set when the heap is expanded |
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435 // for the first time during initialization. |
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436 _reserve_regions = 0; |
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437 |
342 | 438 initialize_all(); |
439 } | |
440 | |
441 // Increment "i", mod "len" | |
442 static void inc_mod(int& i, int len) { | |
443 i++; if (i == len) i = 0; | |
444 } | |
445 | |
446 void G1CollectorPolicy::initialize_flags() { | |
447 set_min_alignment(HeapRegion::GrainBytes); | |
448 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
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449 if (SurvivorRatio < 1) { |
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450 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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451 } |
342 | 452 CollectorPolicy::initialize_flags(); |
453 } | |
454 | |
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455 // The easiest way to deal with the parsing of the NewSize / |
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456 // MaxNewSize / etc. parameteres is to re-use the code in the |
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457 // TwoGenerationCollectorPolicy class. This is similar to what |
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458 // ParallelScavenge does with its GenerationSizer class (see |
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459 // ParallelScavengeHeap::initialize()). We might change this in the |
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460 // future, but it's a good start. |
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461 class G1YoungGenSizer : public TwoGenerationCollectorPolicy { |
3976 | 462 private: |
463 size_t size_to_region_num(size_t byte_size) { | |
464 return MAX2((size_t) 1, byte_size / HeapRegion::GrainBytes); | |
465 } | |
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466 |
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467 public: |
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468 G1YoungGenSizer() { |
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469 initialize_flags(); |
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470 initialize_size_info(); |
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471 } |
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472 size_t min_young_region_num() { |
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473 return size_to_region_num(_min_gen0_size); |
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474 } |
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475 size_t initial_young_region_num() { |
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476 return size_to_region_num(_initial_gen0_size); |
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477 } |
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478 size_t max_young_region_num() { |
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479 return size_to_region_num(_max_gen0_size); |
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480 } |
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481 }; |
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482 |
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483 void G1CollectorPolicy::update_young_list_size_using_newratio(size_t number_of_heap_regions) { |
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484 assert(number_of_heap_regions > 0, "Heap must be initialized"); |
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485 size_t young_size = number_of_heap_regions / (NewRatio + 1); |
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486 _min_desired_young_length = young_size; |
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487 _max_desired_young_length = young_size; |
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488 } |
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489 |
342 | 490 void G1CollectorPolicy::init() { |
491 // Set aside an initial future to_space. | |
492 _g1 = G1CollectedHeap::heap(); | |
493 | |
494 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
495 | |
545 | 496 initialize_gc_policy_counters(); |
497 | |
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498 G1YoungGenSizer sizer; |
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499 size_t initial_region_num = sizer.initial_young_region_num(); |
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500 _min_desired_young_length = sizer.min_young_region_num(); |
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501 _max_desired_young_length = sizer.max_young_region_num(); |
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502 |
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503 if (FLAG_IS_CMDLINE(NewRatio)) { |
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504 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
3976 | 505 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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506 } else { |
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507 // Treat NewRatio as a fixed size that is only recalculated when the heap size changes |
3976 | 508 update_young_list_size_using_newratio(_g1->n_regions()); |
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509 _using_new_ratio_calculations = true; |
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510 } |
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511 } |
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512 |
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513 // GenCollectorPolicy guarantees that min <= initial <= max. |
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514 // Asserting here just to state that we rely on this property. |
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515 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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516 assert(initial_region_num <= _max_desired_young_length, "Initial young gen size too large"); |
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517 assert(_min_desired_young_length <= initial_region_num, "Initial young gen size too small"); |
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518 |
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519 set_adaptive_young_list_length(_min_desired_young_length < _max_desired_young_length); |
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520 if (adaptive_young_list_length()) { |
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521 _young_list_fixed_length = 0; |
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522 } else { |
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523 _young_list_fixed_length = initial_region_num; |
342 | 524 } |
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525 _free_regions_at_end_of_collection = _g1->free_regions(); |
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526 update_young_list_target_length(); |
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527 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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528 |
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529 // We may immediately start allocating regions and placing them on the |
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530 // collection set list. Initialize the per-collection set info |
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531 start_incremental_cset_building(); |
342 | 532 } |
533 | |
545 | 534 // Create the jstat counters for the policy. |
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535 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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536 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 537 } |
538 | |
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539 bool G1CollectorPolicy::predict_will_fit(size_t young_length, |
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540 double base_time_ms, |
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541 size_t base_free_regions, |
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542 double target_pause_time_ms) { |
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543 if (young_length >= base_free_regions) { |
342 | 544 // end condition 1: not enough space for the young regions |
545 return false; | |
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546 } |
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547 |
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548 double accum_surv_rate = accum_yg_surv_rate_pred((int)(young_length - 1)); |
342 | 549 size_t bytes_to_copy = |
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550 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 551 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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552 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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553 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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554 if (pause_time_ms > target_pause_time_ms) { |
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555 // end condition 2: prediction is over the target pause time |
342 | 556 return false; |
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557 } |
342 | 558 |
559 size_t free_bytes = | |
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560 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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561 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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562 // end condition 3: out-of-space (conservatively!) |
342 | 563 return false; |
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564 } |
342 | 565 |
566 // success! | |
567 return true; | |
568 } | |
569 | |
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570 void G1CollectorPolicy::record_new_heap_size(size_t new_number_of_regions) { |
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571 // re-calculate the necessary reserve |
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572 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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573 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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574 // smaller than 1.0) we'll get 1. |
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575 _reserve_regions = (size_t) ceil(reserve_regions_d); |
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576 |
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577 if (_using_new_ratio_calculations) { |
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578 // -XX:NewRatio was specified so we need to update the |
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579 // young gen length when the heap size has changed. |
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580 update_young_list_size_using_newratio(new_number_of_regions); |
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581 } |
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582 } |
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583 |
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584 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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585 size_t base_min_length) { |
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586 size_t desired_min_length = 0; |
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587 if (adaptive_young_list_length()) { |
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588 if (_alloc_rate_ms_seq->num() > 3) { |
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589 double now_sec = os::elapsedTime(); |
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590 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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591 double alloc_rate_ms = predict_alloc_rate_ms(); |
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592 desired_min_length = (size_t) ceil(alloc_rate_ms * when_ms); |
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593 } else { |
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594 // otherwise we don't have enough info to make the prediction |
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595 } |
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596 } |
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597 desired_min_length += base_min_length; |
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598 // make sure we don't go below any user-defined minimum bound |
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599 return MAX2(_min_desired_young_length, desired_min_length); |
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600 } |
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601 |
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602 size_t G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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603 // Here, we might want to also take into account any additional |
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604 // constraints (i.e., user-defined minimum bound). Currently, we |
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605 // effectively don't set this bound. |
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606 return _max_desired_young_length; |
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607 } |
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608 |
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609 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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610 if (rs_lengths == (size_t) -1) { |
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611 // if it's set to the default value (-1), we should predict it; |
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612 // otherwise, use the given value. |
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613 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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614 } |
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615 |
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616 // Calculate the absolute and desired min bounds. |
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617 |
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618 // This is how many young regions we already have (currently: the survivors). |
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619 size_t base_min_length = recorded_survivor_regions(); |
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620 // This is the absolute minimum young length, which ensures that we |
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621 // can allocate one eden region in the worst-case. |
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622 size_t absolute_min_length = base_min_length + 1; |
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623 size_t desired_min_length = |
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624 calculate_young_list_desired_min_length(base_min_length); |
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625 if (desired_min_length < absolute_min_length) { |
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626 desired_min_length = absolute_min_length; |
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627 } |
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628 |
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629 // Calculate the absolute and desired max bounds. |
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630 |
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631 // We will try our best not to "eat" into the reserve. |
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632 size_t absolute_max_length = 0; |
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633 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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634 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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635 } |
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636 size_t desired_max_length = calculate_young_list_desired_max_length(); |
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637 if (desired_max_length > absolute_max_length) { |
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638 desired_max_length = absolute_max_length; |
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639 } |
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640 |
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641 size_t young_list_target_length = 0; |
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642 if (adaptive_young_list_length()) { |
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643 if (full_young_gcs()) { |
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644 young_list_target_length = |
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645 calculate_young_list_target_length(rs_lengths, |
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646 base_min_length, |
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647 desired_min_length, |
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648 desired_max_length); |
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649 _rs_lengths_prediction = rs_lengths; |
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650 } else { |
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651 // Don't calculate anything and let the code below bound it to |
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652 // the desired_min_length, i.e., do the next GC as soon as |
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653 // possible to maximize how many old regions we can add to it. |
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654 } |
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655 } else { |
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656 if (full_young_gcs()) { |
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657 young_list_target_length = _young_list_fixed_length; |
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658 } else { |
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659 // A bit arbitrary: during partially-young GCs we allocate half |
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660 // the young regions to try to add old regions to the CSet. |
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661 young_list_target_length = _young_list_fixed_length / 2; |
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662 // We choose to accept that we might go under the desired min |
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663 // length given that we intentionally ask for a smaller young gen. |
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664 desired_min_length = absolute_min_length; |
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665 } |
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666 } |
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667 |
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668 // Make sure we don't go over the desired max length, nor under the |
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669 // desired min length. In case they clash, desired_min_length wins |
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670 // which is why that test is second. |
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671 if (young_list_target_length > desired_max_length) { |
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672 young_list_target_length = desired_max_length; |
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673 } |
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674 if (young_list_target_length < desired_min_length) { |
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675 young_list_target_length = desired_min_length; |
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676 } |
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677 |
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678 assert(young_list_target_length > recorded_survivor_regions(), |
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679 "we should be able to allocate at least one eden region"); |
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680 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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681 _young_list_target_length = young_list_target_length; |
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682 |
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683 update_max_gc_locker_expansion(); |
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684 } |
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685 |
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686 size_t |
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687 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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688 size_t base_min_length, |
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689 size_t desired_min_length, |
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690 size_t desired_max_length) { |
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691 assert(adaptive_young_list_length(), "pre-condition"); |
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692 assert(full_young_gcs(), "only call this for fully-young GCs"); |
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693 |
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694 // In case some edge-condition makes the desired max length too small... |
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695 if (desired_max_length <= desired_min_length) { |
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696 return desired_min_length; |
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697 } |
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698 |
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699 // We'll adjust min_young_length and max_young_length not to include |
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700 // the already allocated young regions (i.e., so they reflect the |
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701 // min and max eden regions we'll allocate). The base_min_length |
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702 // will be reflected in the predictions by the |
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703 // survivor_regions_evac_time prediction. |
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704 assert(desired_min_length > base_min_length, "invariant"); |
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705 size_t min_young_length = desired_min_length - base_min_length; |
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706 assert(desired_max_length > base_min_length, "invariant"); |
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707 size_t max_young_length = desired_max_length - base_min_length; |
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708 |
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709 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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710 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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711 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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712 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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713 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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714 double base_time_ms = |
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715 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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716 survivor_regions_evac_time; |
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717 size_t available_free_regions = _free_regions_at_end_of_collection; |
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718 size_t base_free_regions = 0; |
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719 if (available_free_regions > _reserve_regions) { |
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720 base_free_regions = available_free_regions - _reserve_regions; |
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721 } |
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722 |
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723 // Here, we will make sure that the shortest young length that |
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724 // makes sense fits within the target pause time. |
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725 |
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726 if (predict_will_fit(min_young_length, base_time_ms, |
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727 base_free_regions, target_pause_time_ms)) { |
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728 // The shortest young length will fit into the target pause time; |
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729 // we'll now check whether the absolute maximum number of young |
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730 // regions will fit in the target pause time. If not, we'll do |
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731 // a binary search between min_young_length and max_young_length. |
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732 if (predict_will_fit(max_young_length, base_time_ms, |
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733 base_free_regions, target_pause_time_ms)) { |
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734 // The maximum young length will fit into the target pause time. |
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735 // We are done so set min young length to the maximum length (as |
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736 // the result is assumed to be returned in min_young_length). |
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737 min_young_length = max_young_length; |
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738 } else { |
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739 // The maximum possible number of young regions will not fit within |
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740 // the target pause time so we'll search for the optimal |
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741 // length. The loop invariants are: |
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742 // |
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743 // min_young_length < max_young_length |
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744 // min_young_length is known to fit into the target pause time |
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745 // max_young_length is known not to fit into the target pause time |
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746 // |
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747 // Going into the loop we know the above hold as we've just |
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748 // checked them. Every time around the loop we check whether |
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749 // the middle value between min_young_length and |
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750 // max_young_length fits into the target pause time. If it |
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751 // does, it becomes the new min. If it doesn't, it becomes |
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752 // the new max. This way we maintain the loop invariants. |
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753 |
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754 assert(min_young_length < max_young_length, "invariant"); |
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755 size_t diff = (max_young_length - min_young_length) / 2; |
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756 while (diff > 0) { |
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757 size_t young_length = min_young_length + diff; |
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758 if (predict_will_fit(young_length, base_time_ms, |
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759 base_free_regions, target_pause_time_ms)) { |
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760 min_young_length = young_length; |
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761 } else { |
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762 max_young_length = young_length; |
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763 } |
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764 assert(min_young_length < max_young_length, "invariant"); |
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765 diff = (max_young_length - min_young_length) / 2; |
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766 } |
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767 // The results is min_young_length which, according to the |
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768 // loop invariants, should fit within the target pause time. |
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769 |
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770 // These are the post-conditions of the binary search above: |
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771 assert(min_young_length < max_young_length, |
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772 "otherwise we should have discovered that max_young_length " |
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773 "fits into the pause target and not done the binary search"); |
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774 assert(predict_will_fit(min_young_length, base_time_ms, |
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775 base_free_regions, target_pause_time_ms), |
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776 "min_young_length, the result of the binary search, should " |
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777 "fit into the pause target"); |
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778 assert(!predict_will_fit(min_young_length + 1, 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 be " |
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781 "optimal, so no larger length should fit into the pause target"); |
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782 } |
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783 } else { |
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784 // Even the minimum length doesn't fit into the pause time |
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785 // target, return it as the result nevertheless. |
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786 } |
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787 return base_min_length + min_young_length; |
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788 } |
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789 |
545 | 790 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
791 double survivor_regions_evac_time = 0.0; | |
792 for (HeapRegion * r = _recorded_survivor_head; | |
793 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
794 r = r->get_next_young_region()) { | |
795 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
796 } | |
797 return survivor_regions_evac_time; | |
798 } | |
799 | |
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800 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 801 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
802 | |
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803 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 804 if (rs_lengths > _rs_lengths_prediction) { |
805 // add 10% to avoid having to recalculate often | |
806 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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807 update_young_list_target_length(rs_lengths_prediction); |
342 | 808 } |
809 } | |
810 | |
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811 |
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812 |
342 | 813 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
814 bool is_tlab, | |
815 bool* gc_overhead_limit_was_exceeded) { | |
816 guarantee(false, "Not using this policy feature yet."); | |
817 return NULL; | |
818 } | |
819 | |
820 // This method controls how a collector handles one or more | |
821 // of its generations being fully allocated. | |
822 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
823 bool is_tlab) { | |
824 guarantee(false, "Not using this policy feature yet."); | |
825 return NULL; | |
826 } | |
827 | |
828 | |
829 #ifndef PRODUCT | |
830 bool G1CollectorPolicy::verify_young_ages() { | |
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831 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 832 return |
833 verify_young_ages(head, _short_lived_surv_rate_group); | |
834 // also call verify_young_ages on any additional surv rate groups | |
835 } | |
836 | |
837 bool | |
838 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
839 SurvRateGroup *surv_rate_group) { | |
840 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
841 | |
842 const char* name = surv_rate_group->name(); | |
843 bool ret = true; | |
844 int prev_age = -1; | |
845 | |
846 for (HeapRegion* curr = head; | |
847 curr != NULL; | |
848 curr = curr->get_next_young_region()) { | |
849 SurvRateGroup* group = curr->surv_rate_group(); | |
850 if (group == NULL && !curr->is_survivor()) { | |
851 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
852 ret = false; | |
853 } | |
854 | |
855 if (surv_rate_group == group) { | |
856 int age = curr->age_in_surv_rate_group(); | |
857 | |
858 if (age < 0) { | |
859 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
860 ret = false; | |
861 } | |
862 | |
863 if (age <= prev_age) { | |
864 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
865 "(%d, %d)", name, age, prev_age); | |
866 ret = false; | |
867 } | |
868 prev_age = age; | |
869 } | |
870 } | |
871 | |
872 return ret; | |
873 } | |
874 #endif // PRODUCT | |
875 | |
876 void G1CollectorPolicy::record_full_collection_start() { | |
877 _cur_collection_start_sec = os::elapsedTime(); | |
878 // Release the future to-space so that it is available for compaction into. | |
879 _g1->set_full_collection(); | |
880 } | |
881 | |
882 void G1CollectorPolicy::record_full_collection_end() { | |
883 // Consider this like a collection pause for the purposes of allocation | |
884 // since last pause. | |
885 double end_sec = os::elapsedTime(); | |
886 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
887 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
888 | |
889 _all_full_gc_times_ms->add(full_gc_time_ms); | |
890 | |
595
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891 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 892 |
893 _g1->clear_full_collection(); | |
894 | |
895 // "Nuke" the heuristics that control the fully/partially young GC | |
896 // transitions and make sure we start with fully young GCs after the | |
897 // Full GC. | |
898 set_full_young_gcs(true); | |
899 _last_full_young_gc = false; | |
900 _should_revert_to_full_young_gcs = false; | |
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901 clear_initiate_conc_mark_if_possible(); |
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902 clear_during_initial_mark_pause(); |
342 | 903 _known_garbage_bytes = 0; |
904 _known_garbage_ratio = 0.0; | |
905 _in_marking_window = false; | |
906 _in_marking_window_im = false; | |
907 | |
908 _short_lived_surv_rate_group->start_adding_regions(); | |
909 // also call this on any additional surv rate groups | |
910 | |
545 | 911 record_survivor_regions(0, NULL, NULL); |
912 | |
342 | 913 _prev_region_num_young = _region_num_young; |
914 _prev_region_num_tenured = _region_num_tenured; | |
915 | |
916 _free_regions_at_end_of_collection = _g1->free_regions(); | |
545 | 917 // Reset survivors SurvRateGroup. |
918 _survivor_surv_rate_group->reset(); | |
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919 update_young_list_target_length(); |
1973 | 920 } |
342 | 921 |
922 void G1CollectorPolicy::record_stop_world_start() { | |
923 _stop_world_start = os::elapsedTime(); | |
924 } | |
925 | |
926 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
927 size_t start_used) { | |
928 if (PrintGCDetails) { | |
929 gclog_or_tty->stamp(PrintGCTimeStamps); | |
930 gclog_or_tty->print("[GC pause"); | |
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931 gclog_or_tty->print(" (%s)", full_young_gcs() ? "young" : "partial"); |
342 | 932 } |
933 | |
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934 // We only need to do this here as the policy will only be applied |
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935 // to the GC we're about to start. so, no point is calculating this |
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936 // every time we calculate / recalculate the target young length. |
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937 update_survivors_policy(); |
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938 |
1973 | 939 assert(_g1->used() == _g1->recalculate_used(), |
940 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
941 _g1->used(), _g1->recalculate_used())); | |
342 | 942 |
943 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
944 _all_stop_world_times_ms->add(s_w_t_ms); | |
945 _stop_world_start = 0.0; | |
946 | |
947 _cur_collection_start_sec = start_time_sec; | |
948 _cur_collection_pause_used_at_start_bytes = start_used; | |
949 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
950 _pending_cards = _g1->pending_card_num(); | |
951 _max_pending_cards = _g1->max_pending_card_num(); | |
952 | |
953 _bytes_in_collection_set_before_gc = 0; | |
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954 _bytes_copied_during_gc = 0; |
342 | 955 |
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956 YoungList* young_list = _g1->young_list(); |
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957 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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958 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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959 _capacity_before_gc = _g1->capacity(); |
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960 |
342 | 961 #ifdef DEBUG |
962 // initialise these to something well known so that we can spot | |
963 // if they are not set properly | |
964 | |
965 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 966 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
967 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
968 _par_last_mark_stack_scan_times_ms[i] = -1234.0; | |
969 _par_last_update_rs_times_ms[i] = -1234.0; | |
970 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
971 _par_last_scan_rs_times_ms[i] = -1234.0; | |
972 _par_last_obj_copy_times_ms[i] = -1234.0; | |
973 _par_last_termination_times_ms[i] = -1234.0; | |
974 _par_last_termination_attempts[i] = -1234.0; | |
975 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 976 _par_last_gc_worker_times_ms[i] = -1234.0; |
342 | 977 } |
978 #endif | |
979 | |
980 for (int i = 0; i < _aux_num; ++i) { | |
981 _cur_aux_times_ms[i] = 0.0; | |
982 _cur_aux_times_set[i] = false; | |
983 } | |
984 | |
985 _satb_drain_time_set = false; | |
986 _last_satb_drain_processed_buffers = -1; | |
987 | |
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988 _last_young_gc_full = false; |
342 | 989 |
990 // do that for any other surv rate groups | |
991 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 992 _survivors_age_table.clear(); |
545 | 993 |
342 | 994 assert( verify_young_ages(), "region age verification" ); |
995 } | |
996 | |
997 void G1CollectorPolicy::record_mark_closure_time(double mark_closure_time_ms) { | |
998 _mark_closure_time_ms = mark_closure_time_ms; | |
999 } | |
1000 | |
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1001 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 1002 mark_init_elapsed_time_ms) { |
1003 _during_marking = true; | |
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1004 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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1005 clear_during_initial_mark_pause(); |
342 | 1006 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
1007 } | |
1008 | |
1009 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
1010 _mark_remark_start_sec = os::elapsedTime(); | |
1011 _during_marking = false; | |
1012 } | |
1013 | |
1014 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
1015 double end_time_sec = os::elapsedTime(); | |
1016 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
1017 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
1018 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1019 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1020 | |
1021 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
1022 } | |
1023 | |
1024 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
1025 _mark_cleanup_start_sec = os::elapsedTime(); | |
1026 } | |
1027 | |
1028 void | |
1029 G1CollectorPolicy::record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
1030 size_t max_live_bytes) { | |
1031 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
1032 record_concurrent_mark_cleanup_end_work2(); | |
1033 } | |
1034 | |
1035 void | |
1036 G1CollectorPolicy:: | |
1037 record_concurrent_mark_cleanup_end_work1(size_t freed_bytes, | |
1038 size_t max_live_bytes) { | |
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1039 if (_n_marks < 2) { |
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1040 _n_marks++; |
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1041 } |
342 | 1042 } |
1043 | |
1044 // The important thing about this is that it includes "os::elapsedTime". | |
1045 void G1CollectorPolicy::record_concurrent_mark_cleanup_end_work2() { | |
1046 double end_time_sec = os::elapsedTime(); | |
1047 double elapsed_time_ms = (end_time_sec - _mark_cleanup_start_sec)*1000.0; | |
1048 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
1049 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
1050 _prev_collection_pause_end_ms += elapsed_time_ms; | |
1051 | |
1052 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_time_sec, true); | |
1053 | |
1054 _num_markings++; | |
1055 _n_pauses_at_mark_end = _n_pauses; | |
1056 _n_marks_since_last_pause++; | |
1057 } | |
1058 | |
1059 void | |
1060 G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { | |
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1061 _should_revert_to_full_young_gcs = false; |
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1062 _last_full_young_gc = true; |
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1063 _in_marking_window = false; |
342 | 1064 } |
1065 | |
1066 void G1CollectorPolicy::record_concurrent_pause() { | |
1067 if (_stop_world_start > 0.0) { | |
1068 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1069 _all_yield_times_ms->add(yield_ms); | |
1070 } | |
1071 } | |
1072 | |
1073 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1074 } | |
1075 | |
1076 template<class T> | |
1077 T sum_of(T* sum_arr, int start, int n, int N) { | |
1078 T sum = (T)0; | |
1079 for (int i = 0; i < n; i++) { | |
1080 int j = (start + i) % N; | |
1081 sum += sum_arr[j]; | |
1082 } | |
1083 return sum; | |
1084 } | |
1085 | |
1611 | 1086 void G1CollectorPolicy::print_par_stats(int level, |
1087 const char* str, | |
2430 | 1088 double* data) { |
342 | 1089 double min = data[0], max = data[0]; |
1090 double total = 0.0; | |
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1091 LineBuffer buf(level); |
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1092 buf.append("[%s (ms):", str); |
342 | 1093 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1094 double val = data[i]; | |
1095 if (val < min) | |
1096 min = val; | |
1097 if (val > max) | |
1098 max = val; | |
1099 total += val; | |
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1100 buf.append(" %3.1lf", val); |
342 | 1101 } |
2430 | 1102 buf.append_and_print_cr(""); |
1103 double avg = total / (double) ParallelGCThreads; | |
1104 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", | |
1105 avg, min, max, max - min); | |
342 | 1106 } |
1107 | |
1611 | 1108 void G1CollectorPolicy::print_par_sizes(int level, |
1109 const char* str, | |
2430 | 1110 double* data) { |
342 | 1111 double min = data[0], max = data[0]; |
1112 double total = 0.0; | |
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1113 LineBuffer buf(level); |
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1114 buf.append("[%s :", str); |
342 | 1115 for (uint i = 0; i < ParallelGCThreads; ++i) { |
1116 double val = data[i]; | |
1117 if (val < min) | |
1118 min = val; | |
1119 if (val > max) | |
1120 max = val; | |
1121 total += val; | |
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1122 buf.append(" %d", (int) val); |
342 | 1123 } |
2430 | 1124 buf.append_and_print_cr(""); |
1125 double avg = total / (double) ParallelGCThreads; | |
1126 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", | |
1127 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1128 } |
1129 | |
1130 void G1CollectorPolicy::print_stats (int level, | |
1131 const char* str, | |
1132 double value) { | |
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1133 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1134 } |
1135 | |
1136 void G1CollectorPolicy::print_stats (int level, | |
1137 const char* str, | |
1138 int value) { | |
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1139 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1140 } |
1141 | |
1142 double G1CollectorPolicy::avg_value (double* data) { | |
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1143 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1144 double ret = 0.0; |
1145 for (uint i = 0; i < ParallelGCThreads; ++i) | |
1146 ret += data[i]; | |
1147 return ret / (double) ParallelGCThreads; | |
1148 } else { | |
1149 return data[0]; | |
1150 } | |
1151 } | |
1152 | |
1153 double G1CollectorPolicy::max_value (double* data) { | |
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1154 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1155 double ret = data[0]; |
1156 for (uint i = 1; i < ParallelGCThreads; ++i) | |
1157 if (data[i] > ret) | |
1158 ret = data[i]; | |
1159 return ret; | |
1160 } else { | |
1161 return data[0]; | |
1162 } | |
1163 } | |
1164 | |
1165 double G1CollectorPolicy::sum_of_values (double* data) { | |
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1166 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1167 double sum = 0.0; |
1168 for (uint i = 0; i < ParallelGCThreads; i++) | |
1169 sum += data[i]; | |
1170 return sum; | |
1171 } else { | |
1172 return data[0]; | |
1173 } | |
1174 } | |
1175 | |
1176 double G1CollectorPolicy::max_sum (double* data1, | |
1177 double* data2) { | |
1178 double ret = data1[0] + data2[0]; | |
1179 | |
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1180 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1181 for (uint i = 1; i < ParallelGCThreads; ++i) { |
1182 double data = data1[i] + data2[i]; | |
1183 if (data > ret) | |
1184 ret = data; | |
1185 } | |
1186 } | |
1187 return ret; | |
1188 } | |
1189 | |
1190 // Anything below that is considered to be zero | |
1191 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1192 | |
1707 | 1193 void G1CollectorPolicy::record_collection_pause_end() { |
342 | 1194 double end_time_sec = os::elapsedTime(); |
1195 double elapsed_ms = _last_pause_time_ms; | |
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1196 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1197 size_t rs_size = |
1198 _cur_collection_pause_used_regions_at_start - collection_set_size(); | |
1199 size_t cur_used_bytes = _g1->used(); | |
1200 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1201 bool last_pause_included_initial_mark = false; | |
1707 | 1202 bool update_stats = !_g1->evacuation_failed(); |
342 | 1203 |
1204 #ifndef PRODUCT | |
1205 if (G1YoungSurvRateVerbose) { | |
1206 gclog_or_tty->print_cr(""); | |
1207 _short_lived_surv_rate_group->print(); | |
1208 // do that for any other surv rate groups too | |
1209 } | |
1210 #endif // PRODUCT | |
1211 | |
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1212 last_pause_included_initial_mark = during_initial_mark_pause(); |
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1213 if (last_pause_included_initial_mark) |
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1214 record_concurrent_mark_init_end(0.0); |
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1215 |
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1216 size_t marking_initiating_used_threshold = |
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1217 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1218 |
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1219 if (!_g1->mark_in_progress() && !_last_full_young_gc) { |
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1220 assert(!last_pause_included_initial_mark, "invariant"); |
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1221 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1222 if (cur_used_bytes > _prev_collection_pause_used_at_end_bytes) { |
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1223 assert(!during_initial_mark_pause(), "we should not see this here"); |
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1224 |
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1225 ergo_verbose3(ErgoConcCycles, |
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1226 "request concurrent cycle initiation", |
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1227 ergo_format_reason("occupancy higher than threshold") |
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1228 ergo_format_byte("occupancy") |
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1229 ergo_format_byte_perc("threshold"), |
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1230 cur_used_bytes, |
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1231 marking_initiating_used_threshold, |
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1232 (double) InitiatingHeapOccupancyPercent); |
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1233 |
1359
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1234 // Note: this might have already been set, if during the last |
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1235 // pause we decided to start a cycle but at the beginning of |
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1236 // this pause we decided to postpone it. That's OK. |
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1237 set_initiate_conc_mark_if_possible(); |
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1238 } else { |
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1239 ergo_verbose2(ErgoConcCycles, |
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1240 "do not request concurrent cycle initiation", |
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1241 ergo_format_reason("occupancy lower than previous occupancy") |
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1242 ergo_format_byte("occupancy") |
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1243 ergo_format_byte("previous occupancy"), |
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1244 cur_used_bytes, |
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1245 _prev_collection_pause_used_at_end_bytes); |
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1246 } |
342 | 1247 } |
1248 } | |
1249 | |
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1250 _prev_collection_pause_used_at_end_bytes = cur_used_bytes; |
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1251 |
342 | 1252 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1253 end_time_sec, false); | |
1254 | |
1255 guarantee(_cur_collection_pause_used_regions_at_start >= | |
1256 collection_set_size(), | |
1257 "Negative RS size?"); | |
1258 | |
1259 // This assert is exempted when we're doing parallel collection pauses, | |
1260 // because the fragmentation caused by the parallel GC allocation buffers | |
1261 // can lead to more memory being used during collection than was used | |
1262 // before. Best leave this out until the fragmentation problem is fixed. | |
1263 // Pauses in which evacuation failed can also lead to negative | |
1264 // collections, since no space is reclaimed from a region containing an | |
1265 // object whose evacuation failed. | |
1266 // Further, we're now always doing parallel collection. But I'm still | |
1267 // leaving this here as a placeholder for a more precise assertion later. | |
1268 // (DLD, 10/05.) | |
1269 assert((true || parallel) // Always using GC LABs now. | |
1270 || _g1->evacuation_failed() | |
1271 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1272 "Negative collection"); | |
1273 | |
1274 size_t freed_bytes = | |
1275 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1276 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
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1277 |
342 | 1278 double survival_fraction = |
1279 (double)surviving_bytes/ | |
1280 (double)_collection_set_bytes_used_before; | |
1281 | |
1282 _n_pauses++; | |
1283 | |
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1284 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1285 double mark_stack_scan_time = avg_value(_par_last_mark_stack_scan_times_ms); |
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1286 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1287 double update_rs_processed_buffers = |
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1288 sum_of_values(_par_last_update_rs_processed_buffers); |
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1289 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1290 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1291 double termination_time = avg_value(_par_last_termination_times_ms); |
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1292 |
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1293 double parallel_known_time = update_rs_time + |
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1294 ext_root_scan_time + |
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1295 mark_stack_scan_time + |
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1296 scan_rs_time + |
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1297 obj_copy_time + |
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1298 termination_time; |
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1299 |
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1300 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; |
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1301 |
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1302 PauseSummary* summary = _summary; |
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1303 |
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1304 if (update_stats) { |
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1305 _recent_rs_scan_times_ms->add(scan_rs_time); |
342 | 1306 _recent_pause_times_ms->add(elapsed_ms); |
1307 _recent_rs_sizes->add(rs_size); | |
1308 | |
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1309 MainBodySummary* body_summary = summary->main_body_summary(); |
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1310 guarantee(body_summary != NULL, "should not be null!"); |
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1311 |
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1312 if (_satb_drain_time_set) |
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1313 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); |
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1314 else |
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1315 body_summary->record_satb_drain_time_ms(0.0); |
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1316 |
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1317 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1318 body_summary->record_mark_stack_scan_time_ms(mark_stack_scan_time); |
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1319 body_summary->record_update_rs_time_ms(update_rs_time); |
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1320 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1321 body_summary->record_obj_copy_time_ms(obj_copy_time); |
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1322 if (parallel) { |
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1323 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1324 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
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1325 body_summary->record_termination_time_ms(termination_time); |
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1326 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1327 } |
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1328 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
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1329 |
342 | 1330 // We exempt parallel collection from this check because Alloc Buffer |
1331 // fragmentation can produce negative collections. Same with evac | |
1332 // failure. | |
1333 // Further, we're now always doing parallel collection. But I'm still | |
1334 // leaving this here as a placeholder for a more precise assertion later. | |
1335 // (DLD, 10/05. | |
1336 assert((true || parallel) | |
1337 || _g1->evacuation_failed() | |
1338 || surviving_bytes <= _collection_set_bytes_used_before, | |
1339 "Or else negative collection!"); | |
1340 _recent_CS_bytes_used_before->add(_collection_set_bytes_used_before); | |
1341 _recent_CS_bytes_surviving->add(surviving_bytes); | |
1342 | |
1343 // this is where we update the allocation rate of the application | |
1344 double app_time_ms = | |
1345 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1346 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1347 // This usually happens due to the timer not having the required | |
1348 // granularity. Some Linuxes are the usual culprits. | |
1349 // We'll just set it to something (arbitrarily) small. | |
1350 app_time_ms = 1.0; | |
1351 } | |
1352 size_t regions_allocated = | |
1353 (_region_num_young - _prev_region_num_young) + | |
1354 (_region_num_tenured - _prev_region_num_tenured); | |
1355 double alloc_rate_ms = (double) regions_allocated / app_time_ms; | |
1356 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1357 _prev_region_num_young = _region_num_young; | |
1358 _prev_region_num_tenured = _region_num_tenured; | |
1359 | |
1360 double interval_ms = | |
1361 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1362 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1363 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
1086
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1364 if (recent_avg_pause_time_ratio() < 0.0 || |
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1365 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1366 #ifndef PRODUCT |
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1367 // Dump info to allow post-facto debugging |
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1368 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1369 gclog_or_tty->print_cr("-------------------------------------------"); |
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1370 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1371 _recent_gc_times_ms->dump(); |
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1372 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1373 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1374 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1375 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
1087
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1376 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1377 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1378 #endif // !PRODUCT |
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1379 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1380 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
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1381 if (_recent_avg_pause_time_ratio < 0.0) { |
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1382 _recent_avg_pause_time_ratio = 0.0; |
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1383 } else { |
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1384 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1385 _recent_avg_pause_time_ratio = 1.0; |
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1386 } |
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1387 } |
342 | 1388 } |
1389 | |
1390 if (G1PolicyVerbose > 1) { | |
1391 gclog_or_tty->print_cr(" Recording collection pause(%d)", _n_pauses); | |
1392 } | |
1393 | |
1394 if (G1PolicyVerbose > 1) { | |
1395 gclog_or_tty->print_cr(" ET: %10.6f ms (avg: %10.6f ms)\n" | |
1396 " ET-RS: %10.6f ms (avg: %10.6f ms)\n" | |
1397 " |RS|: " SIZE_FORMAT, | |
1398 elapsed_ms, recent_avg_time_for_pauses_ms(), | |
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1399 scan_rs_time, recent_avg_time_for_rs_scan_ms(), |
342 | 1400 rs_size); |
1401 | |
1402 gclog_or_tty->print_cr(" Used at start: " SIZE_FORMAT"K" | |
1403 " At end " SIZE_FORMAT "K\n" | |
1404 " garbage : " SIZE_FORMAT "K" | |
1405 " of " SIZE_FORMAT "K\n" | |
1406 " survival : %6.2f%% (%6.2f%% avg)", | |
1407 _cur_collection_pause_used_at_start_bytes/K, | |
1408 _g1->used()/K, freed_bytes/K, | |
1409 _collection_set_bytes_used_before/K, | |
1410 survival_fraction*100.0, | |
1411 recent_avg_survival_fraction()*100.0); | |
1412 gclog_or_tty->print_cr(" Recent %% gc pause time: %6.2f", | |
1413 recent_avg_pause_time_ratio() * 100.0); | |
1414 } | |
1415 | |
1416 double other_time_ms = elapsed_ms; | |
1417 | |
1707 | 1418 if (_satb_drain_time_set) { |
1419 other_time_ms -= _cur_satb_drain_time_ms; | |
1420 } | |
1421 | |
1422 if (parallel) { | |
1423 other_time_ms -= _cur_collection_par_time_ms + _cur_clear_ct_time_ms; | |
1424 } else { | |
1425 other_time_ms -= | |
1426 update_rs_time + | |
1427 ext_root_scan_time + mark_stack_scan_time + | |
1428 scan_rs_time + obj_copy_time; | |
342 | 1429 } |
1430 | |
1431 if (PrintGCDetails) { | |
1707 | 1432 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1433 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1434 elapsed_ms / 1000.0); | |
1435 | |
1707 | 1436 if (_satb_drain_time_set) { |
1437 print_stats(1, "SATB Drain Time", _cur_satb_drain_time_ms); | |
1438 } | |
1439 if (_last_satb_drain_processed_buffers >= 0) { | |
1440 print_stats(2, "Processed Buffers", _last_satb_drain_processed_buffers); | |
1441 } | |
1442 if (parallel) { | |
1443 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
2430 | 1444 print_par_stats(2, "GC Worker Start Time", _par_last_gc_worker_start_times_ms); |
1707 | 1445 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1446 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1447 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1448 print_par_stats(2, "Mark Stack Scanning", _par_last_mark_stack_scan_times_ms); | |
1707 | 1449 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1450 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1451 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1452 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
1453 print_par_stats(2, "GC Worker End Time", _par_last_gc_worker_end_times_ms); | |
1454 | |
1455 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1456 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
1457 } | |
1458 print_par_stats(2, "GC Worker Times", _par_last_gc_worker_times_ms); | |
1459 | |
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1460 print_stats(2, "Parallel Other", parallel_other_time); |
1707 | 1461 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
1462 } else { | |
1463 print_stats(1, "Update RS", update_rs_time); | |
1464 print_stats(2, "Processed Buffers", | |
1465 (int)update_rs_processed_buffers); | |
1466 print_stats(1, "Ext Root Scanning", ext_root_scan_time); | |
1467 print_stats(1, "Mark Stack Scanning", mark_stack_scan_time); | |
1468 print_stats(1, "Scan RS", scan_rs_time); | |
1469 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1470 } |
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1471 #ifndef PRODUCT |
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1472 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1473 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1474 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1475 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1476 if (_num_cc_clears > 0) { |
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1477 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1478 } |
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1479 #endif |
342 | 1480 print_stats(1, "Other", other_time_ms); |
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1481 print_stats(2, "Choose CSet", _recorded_young_cset_choice_time_ms); |
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1482 |
342 | 1483 for (int i = 0; i < _aux_num; ++i) { |
1484 if (_cur_aux_times_set[i]) { | |
1485 char buffer[96]; | |
1486 sprintf(buffer, "Aux%d", i); | |
1487 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1488 } | |
1489 } | |
1490 } | |
1491 | |
1492 _all_pause_times_ms->add(elapsed_ms); | |
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1493 if (update_stats) { |
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1494 summary->record_total_time_ms(elapsed_ms); |
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1495 summary->record_other_time_ms(other_time_ms); |
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1496 } |
342 | 1497 for (int i = 0; i < _aux_num; ++i) |
1498 if (_cur_aux_times_set[i]) | |
1499 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1500 | |
1501 // Reset marks-between-pauses counter. | |
1502 _n_marks_since_last_pause = 0; | |
1503 | |
1504 // Update the efficiency-since-mark vars. | |
1505 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1506 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1507 // This usually happens due to the timer not having the required | |
1508 // granularity. Some Linuxes are the usual culprits. | |
1509 // We'll just set it to something (arbitrarily) small. | |
1510 proc_ms = 1.0; | |
1511 } | |
1512 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1513 | |
1514 bool new_in_marking_window = _in_marking_window; | |
1515 bool new_in_marking_window_im = false; | |
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1516 if (during_initial_mark_pause()) { |
342 | 1517 new_in_marking_window = true; |
1518 new_in_marking_window_im = true; | |
1519 } | |
1520 | |
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1521 if (_last_full_young_gc) { |
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1522 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1523 "start partially-young GCs", |
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1524 ergo_format_byte_perc("known garbage"), |
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1525 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1526 set_full_young_gcs(false); |
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1527 _last_full_young_gc = false; |
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1528 } |
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1529 |
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1530 if ( !_last_young_gc_full ) { |
3914
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1531 if (_should_revert_to_full_young_gcs) { |
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1532 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1533 "end partially-young GCs", |
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1534 ergo_format_reason("partially-young GCs end requested") |
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1535 ergo_format_byte_perc("known garbage"), |
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1536 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1537 set_full_young_gcs(true); |
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1538 } else if (_known_garbage_ratio < 0.05) { |
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1539 ergo_verbose3(ErgoPartiallyYoungGCs, |
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1540 "end partially-young GCs", |
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1541 ergo_format_reason("known garbage percent lower than threshold") |
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1542 ergo_format_byte_perc("known garbage") |
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1543 ergo_format_perc("threshold"), |
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1544 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
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1545 0.05 * 100.0); |
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1546 set_full_young_gcs(true); |
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1547 } else if (adaptive_young_list_length() && |
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1548 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
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1549 ergo_verbose5(ErgoPartiallyYoungGCs, |
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1550 "end partially-young GCs", |
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1551 ergo_format_reason("current GC efficiency lower than " |
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1552 "predicted fully-young GC efficiency") |
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1553 ergo_format_double("GC efficiency factor") |
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1554 ergo_format_double("current GC efficiency") |
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1555 ergo_format_double("predicted fully-young GC efficiency") |
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1556 ergo_format_byte_perc("known garbage"), |
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1557 get_gc_eff_factor(), cur_efficiency, |
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1558 predict_young_gc_eff(), |
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1559 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
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1560 set_full_young_gcs(true); |
342 | 1561 } |
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1562 } |
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1563 _should_revert_to_full_young_gcs = false; |
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1564 |
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1565 if (_last_young_gc_full && !_during_marking) { |
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1566 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1567 } |
1568 | |
1569 _short_lived_surv_rate_group->start_adding_regions(); | |
1570 // do that for any other surv rate groupsx | |
1571 | |
1572 // <NEW PREDICTION> | |
1573 | |
677 | 1574 if (update_stats) { |
342 | 1575 double pause_time_ms = elapsed_ms; |
1576 | |
1577 size_t diff = 0; | |
1578 if (_max_pending_cards >= _pending_cards) | |
1579 diff = _max_pending_cards - _pending_cards; | |
1580 _pending_card_diff_seq->add((double) diff); | |
1581 | |
1582 double cost_per_card_ms = 0.0; | |
1583 if (_pending_cards > 0) { | |
1584 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1585 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1586 } | |
1587 | |
1588 size_t cards_scanned = _g1->cards_scanned(); | |
1589 | |
1590 double cost_per_entry_ms = 0.0; | |
1591 if (cards_scanned > 10) { | |
1592 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
1593 if (_last_young_gc_full) | |
1594 _cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1595 else | |
1596 _partially_young_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1597 } | |
1598 | |
1599 if (_max_rs_lengths > 0) { | |
1600 double cards_per_entry_ratio = | |
1601 (double) cards_scanned / (double) _max_rs_lengths; | |
1602 if (_last_young_gc_full) | |
1603 _fully_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1604 else | |
1605 _partially_young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1606 } | |
1607 | |
1608 size_t rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; | |
1609 if (rs_length_diff >= 0) | |
1610 _rs_length_diff_seq->add((double) rs_length_diff); | |
1611 | |
1612 size_t copied_bytes = surviving_bytes; | |
1613 double cost_per_byte_ms = 0.0; | |
1614 if (copied_bytes > 0) { | |
1615 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
1616 if (_in_marking_window) | |
1617 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); | |
1618 else | |
1619 _cost_per_byte_ms_seq->add(cost_per_byte_ms); | |
1620 } | |
1621 | |
1622 double all_other_time_ms = pause_time_ms - | |
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1623 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1624 _mark_closure_time_ms + termination_time); |
1625 | |
1626 double young_other_time_ms = 0.0; | |
1627 if (_recorded_young_regions > 0) { | |
1628 young_other_time_ms = | |
1629 _recorded_young_cset_choice_time_ms + | |
1630 _recorded_young_free_cset_time_ms; | |
1631 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
1632 (double) _recorded_young_regions); | |
1633 } | |
1634 double non_young_other_time_ms = 0.0; | |
1635 if (_recorded_non_young_regions > 0) { | |
1636 non_young_other_time_ms = | |
1637 _recorded_non_young_cset_choice_time_ms + | |
1638 _recorded_non_young_free_cset_time_ms; | |
1639 | |
1640 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
1641 (double) _recorded_non_young_regions); | |
1642 } | |
1643 | |
1644 double constant_other_time_ms = all_other_time_ms - | |
1645 (young_other_time_ms + non_young_other_time_ms); | |
1646 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1647 | |
1648 double survival_ratio = 0.0; | |
1649 if (_bytes_in_collection_set_before_gc > 0) { | |
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1650 survival_ratio = (double) _bytes_copied_during_gc / |
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1651 (double) _bytes_in_collection_set_before_gc; |
342 | 1652 } |
1653 | |
1654 _pending_cards_seq->add((double) _pending_cards); | |
1655 _scanned_cards_seq->add((double) cards_scanned); | |
1656 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1657 | |
1658 double expensive_region_limit_ms = | |
751 | 1659 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1660 if (expensive_region_limit_ms < 0.0) { |
1661 // this means that the other time was predicted to be longer than | |
1662 // than the max pause time | |
751 | 1663 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1664 } |
1665 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1666 | |
1667 if (PREDICTIONS_VERBOSE) { | |
1668 gclog_or_tty->print_cr(""); | |
1669 gclog_or_tty->print_cr("PREDICTIONS %1.4lf %d " | |
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1670 "REGIONS %d %d %d " |
342 | 1671 "PENDING_CARDS %d %d " |
1672 "CARDS_SCANNED %d %d " | |
1673 "RS_LENGTHS %d %d " | |
1674 "RS_UPDATE %1.6lf %1.6lf RS_SCAN %1.6lf %1.6lf " | |
1675 "SURVIVAL_RATIO %1.6lf %1.6lf " | |
1676 "OBJECT_COPY %1.6lf %1.6lf OTHER_CONSTANT %1.6lf %1.6lf " | |
1677 "OTHER_YOUNG %1.6lf %1.6lf " | |
1678 "OTHER_NON_YOUNG %1.6lf %1.6lf " | |
1679 "VTIME_DIFF %1.6lf TERMINATION %1.6lf " | |
1680 "ELAPSED %1.6lf %1.6lf ", | |
1681 _cur_collection_start_sec, | |
1682 (!_last_young_gc_full) ? 2 : | |
1683 (last_pause_included_initial_mark) ? 1 : 0, | |
1684 _recorded_region_num, | |
1685 _recorded_young_regions, | |
1686 _recorded_non_young_regions, | |
1687 _predicted_pending_cards, _pending_cards, | |
1688 _predicted_cards_scanned, cards_scanned, | |
1689 _predicted_rs_lengths, _max_rs_lengths, | |
1690 _predicted_rs_update_time_ms, update_rs_time, | |
1691 _predicted_rs_scan_time_ms, scan_rs_time, | |
1692 _predicted_survival_ratio, survival_ratio, | |
1693 _predicted_object_copy_time_ms, obj_copy_time, | |
1694 _predicted_constant_other_time_ms, constant_other_time_ms, | |
1695 _predicted_young_other_time_ms, young_other_time_ms, | |
1696 _predicted_non_young_other_time_ms, | |
1697 non_young_other_time_ms, | |
1698 _vtime_diff_ms, termination_time, | |
1699 _predicted_pause_time_ms, elapsed_ms); | |
1700 } | |
1701 | |
1702 if (G1PolicyVerbose > 0) { | |
1703 gclog_or_tty->print_cr("Pause Time, predicted: %1.4lfms (predicted %s), actual: %1.4lfms", | |
1704 _predicted_pause_time_ms, | |
1705 (_within_target) ? "within" : "outside", | |
1706 elapsed_ms); | |
1707 } | |
1708 | |
1709 } | |
1710 | |
1711 _in_marking_window = new_in_marking_window; | |
1712 _in_marking_window_im = new_in_marking_window_im; | |
1713 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1714 update_young_list_target_length(); |
342 | 1715 |
1111 | 1716 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1717 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1718 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
342 | 1719 // </NEW PREDICTION> |
1720 } | |
1721 | |
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1722 #define EXT_SIZE_FORMAT "%d%s" |
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1723 #define EXT_SIZE_PARAMS(bytes) \ |
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1724 byte_size_in_proper_unit((bytes)), \ |
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1725 proper_unit_for_byte_size((bytes)) |
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1726 |
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1727 void G1CollectorPolicy::print_heap_transition() { |
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1728 if (PrintGCDetails) { |
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1729 YoungList* young_list = _g1->young_list(); |
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1730 size_t eden_bytes = young_list->eden_used_bytes(); |
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1731 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1732 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1733 size_t used = _g1->used(); |
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1734 size_t capacity = _g1->capacity(); |
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1735 size_t eden_capacity = |
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1736 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1737 |
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1738 gclog_or_tty->print_cr( |
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1739 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1740 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1741 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1742 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1743 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1744 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1745 EXT_SIZE_PARAMS(eden_bytes), |
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1746 EXT_SIZE_PARAMS(eden_capacity), |
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1747 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1748 EXT_SIZE_PARAMS(survivor_bytes), |
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1749 EXT_SIZE_PARAMS(used_before_gc), |
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1750 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1751 EXT_SIZE_PARAMS(used), |
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1752 EXT_SIZE_PARAMS(capacity)); |
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1753 |
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1754 _prev_eden_capacity = eden_capacity; |
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1755 } else if (PrintGC) { |
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1756 _g1->print_size_transition(gclog_or_tty, |
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1757 _cur_collection_pause_used_at_start_bytes, |
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1758 _g1->used(), _g1->capacity()); |
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1759 } |
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1760 } |
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1761 |
342 | 1762 // <NEW PREDICTION> |
1763 | |
1111 | 1764 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1765 double update_rs_processed_buffers, | |
1766 double goal_ms) { | |
1767 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1768 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1769 | |
1282 | 1770 if (G1UseAdaptiveConcRefinement) { |
1111 | 1771 const int k_gy = 3, k_gr = 6; |
1772 const double inc_k = 1.1, dec_k = 0.9; | |
1773 | |
1774 int g = cg1r->green_zone(); | |
1775 if (update_rs_time > goal_ms) { | |
1776 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1777 } else { | |
1778 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1779 g = (int)MAX2(g * inc_k, g + 1.0); | |
1780 } | |
1781 } | |
1782 // Change the refinement threads params | |
1783 cg1r->set_green_zone(g); | |
1784 cg1r->set_yellow_zone(g * k_gy); | |
1785 cg1r->set_red_zone(g * k_gr); | |
1786 cg1r->reinitialize_threads(); | |
1787 | |
1788 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1789 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1790 cg1r->yellow_zone()); | |
1791 // Change the barrier params | |
1792 dcqs.set_process_completed_threshold(processing_threshold); | |
1793 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1794 } | |
1795 | |
1796 int curr_queue_size = dcqs.completed_buffers_num(); | |
1797 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1798 dcqs.set_completed_queue_padding(curr_queue_size); | |
1799 } else { | |
1800 dcqs.set_completed_queue_padding(0); | |
1801 } | |
1802 dcqs.notify_if_necessary(); | |
1803 } | |
1804 | |
342 | 1805 double |
1806 G1CollectorPolicy:: | |
1807 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1808 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1809 | |
1810 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1811 size_t young_num = g1h->young_list()->length(); |
342 | 1812 if (young_num == 0) |
1813 return 0.0; | |
1814 | |
1815 young_num += adjustment; | |
1816 size_t pending_cards = predict_pending_cards(); | |
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1817 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1818 predict_rs_length_diff(); |
1819 size_t card_num; | |
1820 if (full_young_gcs()) | |
1821 card_num = predict_young_card_num(rs_lengths); | |
1822 else | |
1823 card_num = predict_non_young_card_num(rs_lengths); | |
1824 size_t young_byte_size = young_num * HeapRegion::GrainBytes; | |
1825 double accum_yg_surv_rate = | |
1826 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1827 | |
1828 size_t bytes_to_copy = | |
1829 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1830 | |
1831 return | |
1832 predict_rs_update_time_ms(pending_cards) + | |
1833 predict_rs_scan_time_ms(card_num) + | |
1834 predict_object_copy_time_ms(bytes_to_copy) + | |
1835 predict_young_other_time_ms(young_num) + | |
1836 predict_constant_other_time_ms(); | |
1837 } | |
1838 | |
1839 double | |
1840 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1841 size_t rs_length = predict_rs_length_diff(); | |
1842 size_t card_num; | |
1843 if (full_young_gcs()) | |
1844 card_num = predict_young_card_num(rs_length); | |
1845 else | |
1846 card_num = predict_non_young_card_num(rs_length); | |
1847 return predict_base_elapsed_time_ms(pending_cards, card_num); | |
1848 } | |
1849 | |
1850 double | |
1851 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1852 size_t scanned_cards) { | |
1853 return | |
1854 predict_rs_update_time_ms(pending_cards) + | |
1855 predict_rs_scan_time_ms(scanned_cards) + | |
1856 predict_constant_other_time_ms(); | |
1857 } | |
1858 | |
1859 double | |
1860 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1861 bool young) { | |
1862 size_t rs_length = hr->rem_set()->occupied(); | |
1863 size_t card_num; | |
1864 if (full_young_gcs()) | |
1865 card_num = predict_young_card_num(rs_length); | |
1866 else | |
1867 card_num = predict_non_young_card_num(rs_length); | |
1868 size_t bytes_to_copy = predict_bytes_to_copy(hr); | |
1869 | |
1870 double region_elapsed_time_ms = | |
1871 predict_rs_scan_time_ms(card_num) + | |
1872 predict_object_copy_time_ms(bytes_to_copy); | |
1873 | |
1874 if (young) | |
1875 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1876 else | |
1877 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1878 | |
1879 return region_elapsed_time_ms; | |
1880 } | |
1881 | |
1882 size_t | |
1883 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1884 size_t bytes_to_copy; | |
1885 if (hr->is_marked()) | |
1886 bytes_to_copy = hr->max_live_bytes(); | |
1887 else { | |
1888 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1889 "invariant" ); | |
1890 int age = hr->age_in_surv_rate_group(); | |
545 | 1891 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1892 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1893 } | |
1894 | |
1895 return bytes_to_copy; | |
1896 } | |
1897 | |
1898 void | |
1899 G1CollectorPolicy::start_recording_regions() { | |
1900 _recorded_rs_lengths = 0; | |
1901 _recorded_young_regions = 0; | |
1902 _recorded_non_young_regions = 0; | |
1903 | |
1904 #if PREDICTIONS_VERBOSE | |
1905 _recorded_marked_bytes = 0; | |
1906 _recorded_young_bytes = 0; | |
1907 _predicted_bytes_to_copy = 0; | |
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1908 _predicted_rs_lengths = 0; |
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1909 _predicted_cards_scanned = 0; |
342 | 1910 #endif // PREDICTIONS_VERBOSE |
1911 } | |
1912 | |
1913 void | |
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1914 G1CollectorPolicy::record_cset_region_info(HeapRegion* hr, bool young) { |
342 | 1915 #if PREDICTIONS_VERBOSE |
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1916 if (!young) { |
342 | 1917 _recorded_marked_bytes += hr->max_live_bytes(); |
1918 } | |
1919 _predicted_bytes_to_copy += predict_bytes_to_copy(hr); | |
1920 #endif // PREDICTIONS_VERBOSE | |
1921 | |
1922 size_t rs_length = hr->rem_set()->occupied(); | |
1923 _recorded_rs_lengths += rs_length; | |
1924 } | |
1925 | |
1926 void | |
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1927 G1CollectorPolicy::record_non_young_cset_region(HeapRegion* hr) { |
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1928 assert(!hr->is_young(), "should not call this"); |
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1929 ++_recorded_non_young_regions; |
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1930 record_cset_region_info(hr, false); |
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1931 } |
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1932 |
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1933 void |
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1934 G1CollectorPolicy::set_recorded_young_regions(size_t n_regions) { |
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1935 _recorded_young_regions = n_regions; |
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1936 } |
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1937 |
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1938 void G1CollectorPolicy::set_recorded_young_bytes(size_t bytes) { |
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1939 #if PREDICTIONS_VERBOSE |
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1940 _recorded_young_bytes = bytes; |
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1941 #endif // PREDICTIONS_VERBOSE |
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1942 } |
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1943 |
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1944 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1945 _recorded_rs_lengths = rs_lengths; |
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1946 } |
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1947 |
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1948 void G1CollectorPolicy::set_predicted_bytes_to_copy(size_t bytes) { |
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1949 _predicted_bytes_to_copy = bytes; |
342 | 1950 } |
1951 | |
1952 void | |
1953 G1CollectorPolicy::end_recording_regions() { | |
1394
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1954 // The _predicted_pause_time_ms field is referenced in code |
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1955 // not under PREDICTIONS_VERBOSE. Let's initialize it. |
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1956 _predicted_pause_time_ms = -1.0; |
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1957 |
342 | 1958 #if PREDICTIONS_VERBOSE |
1959 _predicted_pending_cards = predict_pending_cards(); | |
1960 _predicted_rs_lengths = _recorded_rs_lengths + predict_rs_length_diff(); | |
1961 if (full_young_gcs()) | |
1962 _predicted_cards_scanned += predict_young_card_num(_predicted_rs_lengths); | |
1963 else | |
1964 _predicted_cards_scanned += | |
1965 predict_non_young_card_num(_predicted_rs_lengths); | |
1966 _recorded_region_num = _recorded_young_regions + _recorded_non_young_regions; | |
1967 | |
1968 _predicted_rs_update_time_ms = | |
1969 predict_rs_update_time_ms(_g1->pending_card_num()); | |
1970 _predicted_rs_scan_time_ms = | |
1971 predict_rs_scan_time_ms(_predicted_cards_scanned); | |
1972 _predicted_object_copy_time_ms = | |
1973 predict_object_copy_time_ms(_predicted_bytes_to_copy); | |
1974 _predicted_constant_other_time_ms = | |
1975 predict_constant_other_time_ms(); | |
1976 _predicted_young_other_time_ms = | |
1977 predict_young_other_time_ms(_recorded_young_regions); | |
1978 _predicted_non_young_other_time_ms = | |
1979 predict_non_young_other_time_ms(_recorded_non_young_regions); | |
1980 | |
1981 _predicted_pause_time_ms = | |
1982 _predicted_rs_update_time_ms + | |
1983 _predicted_rs_scan_time_ms + | |
1984 _predicted_object_copy_time_ms + | |
1985 _predicted_constant_other_time_ms + | |
1986 _predicted_young_other_time_ms + | |
1987 _predicted_non_young_other_time_ms; | |
1988 #endif // PREDICTIONS_VERBOSE | |
1989 } | |
1990 | |
1991 void G1CollectorPolicy::check_if_region_is_too_expensive(double | |
1992 predicted_time_ms) { | |
1993 // I don't think we need to do this when in young GC mode since | |
1994 // marking will be initiated next time we hit the soft limit anyway... | |
1995 if (predicted_time_ms > _expensive_region_limit_ms) { | |
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1996 ergo_verbose2(ErgoPartiallyYoungGCs, |
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1997 "request partially-young GCs end", |
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1998 ergo_format_reason("predicted region time higher than threshold") |
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1999 ergo_format_ms("predicted region time") |
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2000 ergo_format_ms("threshold"), |
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2001 predicted_time_ms, _expensive_region_limit_ms); |
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2002 // no point in doing another partial one |
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2003 _should_revert_to_full_young_gcs = true; |
342 | 2004 } |
2005 } | |
2006 | |
2007 // </NEW PREDICTION> | |
2008 | |
2009 | |
2010 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
2011 double elapsed_ms) { | |
2012 _recent_gc_times_ms->add(elapsed_ms); | |
2013 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
2014 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
2015 } | |
2016 | |
2017 double G1CollectorPolicy::recent_avg_time_for_pauses_ms() { | |
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2018 if (_recent_pause_times_ms->num() == 0) { |
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2019 return (double) MaxGCPauseMillis; |
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2020 } |
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2021 return _recent_pause_times_ms->avg(); |
342 | 2022 } |
2023 | |
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2024 double G1CollectorPolicy::recent_avg_time_for_rs_scan_ms() { |
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2025 if (_recent_rs_scan_times_ms->num() == 0) { |
751 | 2026 return (double)MaxGCPauseMillis/3.0; |
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2027 } |
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2028 return _recent_rs_scan_times_ms->avg(); |
342 | 2029 } |
2030 | |
2031 int G1CollectorPolicy::number_of_recent_gcs() { | |
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2032 assert(_recent_rs_scan_times_ms->num() == |
342 | 2033 _recent_pause_times_ms->num(), "Sequence out of sync"); |
2034 assert(_recent_pause_times_ms->num() == | |
2035 _recent_CS_bytes_used_before->num(), "Sequence out of sync"); | |
2036 assert(_recent_CS_bytes_used_before->num() == | |
2037 _recent_CS_bytes_surviving->num(), "Sequence out of sync"); | |
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2038 |
342 | 2039 return _recent_pause_times_ms->num(); |
2040 } | |
2041 | |
2042 double G1CollectorPolicy::recent_avg_survival_fraction() { | |
2043 return recent_avg_survival_fraction_work(_recent_CS_bytes_surviving, | |
2044 _recent_CS_bytes_used_before); | |
2045 } | |
2046 | |
2047 double G1CollectorPolicy::last_survival_fraction() { | |
2048 return last_survival_fraction_work(_recent_CS_bytes_surviving, | |
2049 _recent_CS_bytes_used_before); | |
2050 } | |
2051 | |
2052 double | |
2053 G1CollectorPolicy::recent_avg_survival_fraction_work(TruncatedSeq* surviving, | |
2054 TruncatedSeq* before) { | |
2055 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2056 if (before->sum() > 0.0) { | |
2057 double recent_survival_rate = surviving->sum() / before->sum(); | |
2058 // We exempt parallel collection from this check because Alloc Buffer | |
2059 // fragmentation can produce negative collections. | |
2060 // Further, we're now always doing parallel collection. But I'm still | |
2061 // leaving this here as a placeholder for a more precise assertion later. | |
2062 // (DLD, 10/05.) | |
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2063 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2064 _g1->evacuation_failed() || |
2065 recent_survival_rate <= 1.0, "Or bad frac"); | |
2066 return recent_survival_rate; | |
2067 } else { | |
2068 return 1.0; // Be conservative. | |
2069 } | |
2070 } | |
2071 | |
2072 double | |
2073 G1CollectorPolicy::last_survival_fraction_work(TruncatedSeq* surviving, | |
2074 TruncatedSeq* before) { | |
2075 assert(surviving->num() == before->num(), "Sequence out of sync"); | |
2076 if (surviving->num() > 0 && before->last() > 0.0) { | |
2077 double last_survival_rate = surviving->last() / before->last(); | |
2078 // We exempt parallel collection from this check because Alloc Buffer | |
2079 // fragmentation can produce negative collections. | |
2080 // Further, we're now always doing parallel collection. But I'm still | |
2081 // leaving this here as a placeholder for a more precise assertion later. | |
2082 // (DLD, 10/05.) | |
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2083 assert((true || G1CollectedHeap::use_parallel_gc_threads()) || |
342 | 2084 last_survival_rate <= 1.0, "Or bad frac"); |
2085 return last_survival_rate; | |
2086 } else { | |
2087 return 1.0; | |
2088 } | |
2089 } | |
2090 | |
2091 static const int survival_min_obs = 5; | |
2092 static double survival_min_obs_limits[] = { 0.9, 0.7, 0.5, 0.3, 0.1 }; | |
2093 static const double min_survival_rate = 0.1; | |
2094 | |
2095 double | |
2096 G1CollectorPolicy::conservative_avg_survival_fraction_work(double avg, | |
2097 double latest) { | |
2098 double res = avg; | |
2099 if (number_of_recent_gcs() < survival_min_obs) { | |
2100 res = MAX2(res, survival_min_obs_limits[number_of_recent_gcs()]); | |
2101 } | |
2102 res = MAX2(res, latest); | |
2103 res = MAX2(res, min_survival_rate); | |
2104 // In the parallel case, LAB fragmentation can produce "negative | |
2105 // collections"; so can evac failure. Cap at 1.0 | |
2106 res = MIN2(res, 1.0); | |
2107 return res; | |
2108 } | |
2109 | |
2110 size_t G1CollectorPolicy::expansion_amount() { | |
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2111 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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2112 double threshold = _gc_overhead_perc; |
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2113 if (recent_gc_overhead > threshold) { |
751 | 2114 // We will double the existing space, or take |
2115 // G1ExpandByPercentOfAvailable % of the available expansion | |
2116 // space, whichever is smaller, bounded below by a minimum | |
2117 // expansion (unless that's all that's left.) | |
342 | 2118 const size_t min_expand_bytes = 1*M; |
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2119 size_t reserved_bytes = _g1->max_capacity(); |
342 | 2120 size_t committed_bytes = _g1->capacity(); |
2121 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
2122 size_t expand_bytes; | |
2123 size_t expand_bytes_via_pct = | |
751 | 2124 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 2125 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
2126 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
2127 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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2128 |
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2129 ergo_verbose5(ErgoHeapSizing, |
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2130 "attempt heap expansion", |
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2131 ergo_format_reason("recent GC overhead higher than " |
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2132 "threshold after GC") |
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2133 ergo_format_perc("recent GC overhead") |
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2134 ergo_format_perc("threshold") |
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2135 ergo_format_byte("uncommitted") |
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2136 ergo_format_byte_perc("calculated expansion amount"), |
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2137 recent_gc_overhead, threshold, |
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2138 uncommitted_bytes, |
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2139 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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2140 |
342 | 2141 return expand_bytes; |
2142 } else { | |
2143 return 0; | |
2144 } | |
2145 } | |
2146 | |
2147 void G1CollectorPolicy::note_start_of_mark_thread() { | |
2148 _mark_thread_startup_sec = os::elapsedTime(); | |
2149 } | |
2150 | |
2151 class CountCSClosure: public HeapRegionClosure { | |
2152 G1CollectorPolicy* _g1_policy; | |
2153 public: | |
2154 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
2155 _g1_policy(g1_policy) {} | |
2156 bool doHeapRegion(HeapRegion* r) { | |
2157 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
2158 return false; | |
2159 } | |
2160 }; | |
2161 | |
2162 void G1CollectorPolicy::count_CS_bytes_used() { | |
2163 CountCSClosure cs_closure(this); | |
2164 _g1->collection_set_iterate(&cs_closure); | |
2165 } | |
2166 | |
2167 void G1CollectorPolicy::print_summary (int level, | |
2168 const char* str, | |
2169 NumberSeq* seq) const { | |
2170 double sum = seq->sum(); | |
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2171 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 2172 str, sum / 1000.0, seq->avg()); |
2173 } | |
2174 | |
2175 void G1CollectorPolicy::print_summary_sd (int level, | |
2176 const char* str, | |
2177 NumberSeq* seq) const { | |
2178 print_summary(level, str, seq); | |
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2179 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 2180 seq->num(), seq->sd(), seq->maximum()); |
2181 } | |
2182 | |
2183 void G1CollectorPolicy::check_other_times(int level, | |
2184 NumberSeq* other_times_ms, | |
2185 NumberSeq* calc_other_times_ms) const { | |
2186 bool should_print = false; | |
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2187 LineBuffer buf(level + 2); |
342 | 2188 |
2189 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
2190 fabs(calc_other_times_ms->sum())); | |
2191 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
2192 fabs(calc_other_times_ms->sum())); | |
2193 double sum_ratio = max_sum / min_sum; | |
2194 if (sum_ratio > 1.1) { | |
2195 should_print = true; | |
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2196 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 2197 } |
2198 | |
2199 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
2200 fabs(calc_other_times_ms->avg())); | |
2201 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
2202 fabs(calc_other_times_ms->avg())); | |
2203 double avg_ratio = max_avg / min_avg; | |
2204 if (avg_ratio > 1.1) { | |
2205 should_print = true; | |
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2206 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 2207 } |
2208 | |
2209 if (other_times_ms->sum() < -0.01) { | |
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2210 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 2211 } |
2212 | |
2213 if (other_times_ms->avg() < -0.01) { | |
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2214 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 2215 } |
2216 | |
2217 if (calc_other_times_ms->sum() < -0.01) { | |
2218 should_print = true; | |
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2219 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 2220 } |
2221 | |
2222 if (calc_other_times_ms->avg() < -0.01) { | |
2223 should_print = true; | |
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2224 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 2225 } |
2226 | |
2227 if (should_print) | |
2228 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
2229 } | |
2230 | |
2231 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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2232 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 2233 MainBodySummary* body_summary = summary->main_body_summary(); |
2234 if (summary->get_total_seq()->num() > 0) { | |
677 | 2235 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 2236 if (body_summary != NULL) { |
2237 print_summary(1, "SATB Drain", body_summary->get_satb_drain_seq()); | |
2238 if (parallel) { | |
2239 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
2240 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); | |
2241 print_summary(2, "Ext Root Scanning", | |
2242 body_summary->get_ext_root_scan_seq()); | |
2243 print_summary(2, "Mark Stack Scanning", | |
2244 body_summary->get_mark_stack_scan_seq()); | |
2245 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2246 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2247 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
2248 print_summary(2, "Other", body_summary->get_parallel_other_seq()); | |
2249 { | |
2250 NumberSeq* other_parts[] = { | |
2251 body_summary->get_update_rs_seq(), | |
2252 body_summary->get_ext_root_scan_seq(), | |
2253 body_summary->get_mark_stack_scan_seq(), | |
2254 body_summary->get_scan_rs_seq(), | |
2255 body_summary->get_obj_copy_seq(), | |
2256 body_summary->get_termination_seq() | |
2257 }; | |
2258 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2259 6, other_parts); |
342 | 2260 check_other_times(2, body_summary->get_parallel_other_seq(), |
2261 &calc_other_times_ms); | |
2262 } | |
2263 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); | |
2264 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
2265 } else { | |
2266 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); | |
2267 print_summary(1, "Ext Root Scanning", | |
2268 body_summary->get_ext_root_scan_seq()); | |
2269 print_summary(1, "Mark Stack Scanning", | |
2270 body_summary->get_mark_stack_scan_seq()); | |
2271 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2272 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2273 } | |
2274 } | |
2275 print_summary(1, "Other", summary->get_other_seq()); | |
2276 { | |
1779 | 2277 if (body_summary != NULL) { |
2278 NumberSeq calc_other_times_ms; | |
2279 if (parallel) { | |
2280 // parallel | |
2281 NumberSeq* other_parts[] = { | |
2282 body_summary->get_satb_drain_seq(), | |
2283 body_summary->get_parallel_seq(), | |
2284 body_summary->get_clear_ct_seq() | |
2285 }; | |
2286 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2287 3, other_parts); | |
2288 } else { | |
2289 // serial | |
2290 NumberSeq* other_parts[] = { | |
2291 body_summary->get_satb_drain_seq(), | |
2292 body_summary->get_update_rs_seq(), | |
2293 body_summary->get_ext_root_scan_seq(), | |
2294 body_summary->get_mark_stack_scan_seq(), | |
2295 body_summary->get_scan_rs_seq(), | |
2296 body_summary->get_obj_copy_seq() | |
2297 }; | |
2298 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2299 6, other_parts); | |
2300 } | |
2301 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2302 } |
2303 } | |
2304 } else { | |
2363
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7022943: G1: improve logging to avoid interleaved numbers
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2188
diff
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|
2305 LineBuffer(1).append_and_print_cr("none"); |
342 | 2306 } |
2363
c93aa6caa02f
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2188
diff
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|
2307 LineBuffer(0).append_and_print_cr(""); |
342 | 2308 } |
2309 | |
2310 void G1CollectorPolicy::print_tracing_info() const { | |
2311 if (TraceGen0Time) { | |
2312 gclog_or_tty->print_cr("ALL PAUSES"); | |
2313 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2314 gclog_or_tty->print_cr(""); | |
2315 gclog_or_tty->print_cr(""); | |
2316 gclog_or_tty->print_cr(" Full Young GC Pauses: %8d", _full_young_pause_num); | |
2317 gclog_or_tty->print_cr(" Partial Young GC Pauses: %8d", _partial_young_pause_num); | |
2318 gclog_or_tty->print_cr(""); | |
2319 | |
677 | 2320 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2321 print_summary(_summary); | |
342 | 2322 |
2323 gclog_or_tty->print_cr("MISC"); | |
2324 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2325 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2326 for (int i = 0; i < _aux_num; ++i) { | |
2327 if (_all_aux_times_ms[i].num() > 0) { | |
2328 char buffer[96]; | |
2329 sprintf(buffer, "Aux%d", i); | |
2330 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2331 } | |
2332 } | |
2333 | |
2334 size_t all_region_num = _region_num_young + _region_num_tenured; | |
2335 gclog_or_tty->print_cr(" New Regions %8d, Young %8d (%6.2lf%%), " | |
2336 "Tenured %8d (%6.2lf%%)", | |
2337 all_region_num, | |
2338 _region_num_young, | |
2339 (double) _region_num_young / (double) all_region_num * 100.0, | |
2340 _region_num_tenured, | |
2341 (double) _region_num_tenured / (double) all_region_num * 100.0); | |
2342 } | |
2343 if (TraceGen1Time) { | |
2344 if (_all_full_gc_times_ms->num() > 0) { | |
2345 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2346 _all_full_gc_times_ms->num(), | |
2347 _all_full_gc_times_ms->sum() / 1000.0); | |
2348 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2349 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2350 _all_full_gc_times_ms->sd(), | |
2351 _all_full_gc_times_ms->maximum()); | |
2352 } | |
2353 } | |
2354 } | |
2355 | |
2356 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2357 #ifndef PRODUCT | |
2358 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2359 // add this call for any other surv rate groups | |
2360 #endif // PRODUCT | |
2361 } | |
2362 | |
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2363 void G1CollectorPolicy::update_region_num(bool young) { |
1973 | 2364 if (young) { |
342 | 2365 ++_region_num_young; |
2366 } else { | |
2367 ++_region_num_tenured; | |
2368 } | |
2369 } | |
2370 | |
2371 #ifndef PRODUCT | |
2372 // for debugging, bit of a hack... | |
2373 static char* | |
2374 region_num_to_mbs(int length) { | |
2375 static char buffer[64]; | |
2376 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2377 double mbs = bytes / (double) (1024 * 1024); | |
2378 sprintf(buffer, "%7.2lfMB", mbs); | |
2379 return buffer; | |
2380 } | |
2381 #endif // PRODUCT | |
2382 | |
545 | 2383 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2384 switch (purpose) { |
2385 case GCAllocForSurvived: | |
545 | 2386 return _max_survivor_regions; |
342 | 2387 case GCAllocForTenured: |
545 | 2388 return REGIONS_UNLIMITED; |
342 | 2389 default: |
545 | 2390 ShouldNotReachHere(); |
2391 return REGIONS_UNLIMITED; | |
342 | 2392 }; |
2393 } | |
2394 | |
3919
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2395 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
1991
016a3628c885
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2396 size_t expansion_region_num = 0; |
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diff
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2397 if (GCLockerEdenExpansionPercent > 0) { |
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|
2398 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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|
2399 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2400 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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diff
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|
2401 // less than 1.0) we'll get 1. |
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diff
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|
2402 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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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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|
2403 } else { |
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 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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|
2405 } |
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diff
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|
2406 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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|
2407 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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diff
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|
2408 } |
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diff
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|
2409 |
545 | 2410 // 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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|
2411 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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|
2412 double max_survivor_regions_d = |
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|
2413 (double) _young_list_target_length / (double) SurvivorRatio; |
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|
2414 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
4f41766176cf
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|
2415 // smaller than 1.0) we'll get 1. |
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|
2416 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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|
2417 |
3868
ae73da50be4b
7081064: G1: remove develop params G1FixedSurvivorSpaceSize, G1FixedTenuringThreshold, and G1FixedEdenSize
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3867
diff
changeset
|
2418 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2419 HeapRegion::GrainWords * _max_survivor_regions); |
2420 } | |
2421 | |
342 | 2422 #ifndef PRODUCT |
2423 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2424 CollectionSetChooser* _chooser; | |
2425 public: | |
2426 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2427 _chooser(chooser) {} | |
2428 | |
2429 bool doHeapRegion(HeapRegion* r) { | |
2430 if (!r->continuesHumongous()) { | |
2431 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2432 } | |
2433 return false; | |
2434 } | |
2435 }; | |
2436 | |
2437 bool G1CollectorPolicy_BestRegionsFirst::assertMarkedBytesDataOK() { | |
2438 HRSortIndexIsOKClosure cl(_collectionSetChooser); | |
2439 _g1->heap_region_iterate(&cl); | |
2440 return true; | |
2441 } | |
2442 #endif | |
2443 | |
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|
2444 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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diff
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|
2445 GCCause::Cause gc_cause) { |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2446 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
|
2447 if (!during_cycle) { |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2448 ergo_verbose1(ErgoConcCycles, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
2449 "request concurrent cycle initiation", |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2450 ergo_format_reason("requested by GC cause") |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2451 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
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|
2452 GCCause::to_string(gc_cause)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2453 set_initiate_conc_mark_if_possible(); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
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|
2454 return true; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
changeset
|
2455 } else { |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
2456 ergo_verbose1(ErgoConcCycles, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
changeset
|
2457 "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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|
2458 ergo_format_reason("concurrent cycle already in progress") |
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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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|
2459 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
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|
2460 GCCause::to_string(gc_cause)); |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
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1611
diff
changeset
|
2461 return false; |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2462 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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1611
diff
changeset
|
2463 } |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
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diff
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|
2464 |
342 | 2465 void |
1359
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2466 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2467 // 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
|
2468 // initial-mark pause. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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diff
changeset
|
2469 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2470 // 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
|
2471 // 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
|
2472 // 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
|
2473 // initial-mark pause). |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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1356
diff
changeset
|
2474 assert(!during_initial_mark_pause(), "pre-condition"); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
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changeset
|
2475 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2476 if (initiate_conc_mark_if_possible()) { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2477 // 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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diff
changeset
|
2478 // 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
|
2479 // concurrent marking cycle. So we might initiate one. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2480 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2481 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
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|
2482 if (!during_cycle) { |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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diff
changeset
|
2483 // 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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diff
changeset
|
2484 // 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
|
2485 // initiate a new cycle. |
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.")
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parents:
1356
diff
changeset
|
2487 set_during_initial_mark_pause(); |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
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|
2488 |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
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1356
diff
changeset
|
2489 // And we can now clear initiate_conc_mark_if_possible() as |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2490 // we've already acted on it. |
23b1b27ac76c
6909756: G1: guarantee(G1CollectedHeap::heap()->mark_in_progress(),"Precondition.")
tonyp
parents:
1356
diff
changeset
|
2491 clear_initiate_conc_mark_if_possible(); |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
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|
2492 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2493 ergo_verbose0(ErgoConcCycles, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
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3868
diff
changeset
|
2494 "initiate concurrent cycle", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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2495 ergo_format_reason("concurrent cycle initiation requested")); |
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2496 } else { |
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2497 // The concurrent marking thread is still finishing up the |
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2498 // previous cycle. If we start one right now the two cycles |
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2499 // overlap. In particular, the concurrent marking thread might |
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2500 // be in the process of clearing the next marking bitmap (which |
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2501 // we will use for the next cycle if we start one). Starting a |
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2502 // cycle now will be bad given that parts of the marking |
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2503 // information might get cleared by the marking thread. And we |
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2504 // cannot wait for the marking thread to finish the cycle as it |
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2505 // periodically yields while clearing the next marking bitmap |
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2506 // and, if it's in a yield point, it's waiting for us to |
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2507 // finish. So, at this point we will not start a cycle and we'll |
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2508 // let the concurrent marking thread complete the last one. |
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2509 ergo_verbose0(ErgoConcCycles, |
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2510 "do not initiate concurrent cycle", |
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2511 ergo_format_reason("concurrent cycle already in progress")); |
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2512 } |
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2513 } |
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2514 } |
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2515 |
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2516 void |
342 | 2517 G1CollectorPolicy_BestRegionsFirst:: |
2518 record_collection_pause_start(double start_time_sec, size_t start_used) { | |
2519 G1CollectorPolicy::record_collection_pause_start(start_time_sec, start_used); | |
2520 } | |
2521 | |
2522 class KnownGarbageClosure: public HeapRegionClosure { | |
2523 CollectionSetChooser* _hrSorted; | |
2524 | |
2525 public: | |
2526 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2527 _hrSorted(hrSorted) | |
2528 {} | |
2529 | |
2530 bool doHeapRegion(HeapRegion* r) { | |
2531 // We only include humongous regions in collection | |
2532 // sets when concurrent mark shows that their contained object is | |
2533 // unreachable. | |
2534 | |
2535 // Do we have any marking information for this region? | |
2536 if (r->is_marked()) { | |
2537 // We don't include humongous regions in collection | |
2538 // sets because we collect them immediately at the end of a marking | |
2539 // cycle. We also don't include young regions because we *must* | |
2540 // include them in the next collection pause. | |
2541 if (!r->isHumongous() && !r->is_young()) { | |
2542 _hrSorted->addMarkedHeapRegion(r); | |
2543 } | |
2544 } | |
2545 return false; | |
2546 } | |
2547 }; | |
2548 | |
2549 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2550 CollectionSetChooser* _hrSorted; | |
2551 jint _marked_regions_added; | |
2552 jint _chunk_size; | |
2553 jint _cur_chunk_idx; | |
2554 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2555 int _worker; | |
2556 int _invokes; | |
2557 | |
2558 void get_new_chunk() { | |
2559 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2560 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2561 } | |
2562 void add_region(HeapRegion* r) { | |
2563 if (_cur_chunk_idx == _cur_chunk_end) { | |
2564 get_new_chunk(); | |
2565 } | |
2566 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2567 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2568 _marked_regions_added++; | |
2569 _cur_chunk_idx++; | |
2570 } | |
2571 | |
2572 public: | |
2573 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2574 jint chunk_size, | |
2575 int worker) : | |
2576 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2577 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2578 _invokes(0) | |
2579 {} | |
2580 | |
2581 bool doHeapRegion(HeapRegion* r) { | |
2582 // We only include humongous regions in collection | |
2583 // sets when concurrent mark shows that their contained object is | |
2584 // unreachable. | |
2585 _invokes++; | |
2586 | |
2587 // Do we have any marking information for this region? | |
2588 if (r->is_marked()) { | |
2589 // We don't include humongous regions in collection | |
2590 // sets because we collect them immediately at the end of a marking | |
2591 // cycle. | |
2592 // We also do not include young regions in collection sets | |
2593 if (!r->isHumongous() && !r->is_young()) { | |
2594 add_region(r); | |
2595 } | |
2596 } | |
2597 return false; | |
2598 } | |
2599 jint marked_regions_added() { return _marked_regions_added; } | |
2600 int invokes() { return _invokes; } | |
2601 }; | |
2602 | |
2603 class ParKnownGarbageTask: public AbstractGangTask { | |
2604 CollectionSetChooser* _hrSorted; | |
2605 jint _chunk_size; | |
2606 G1CollectedHeap* _g1; | |
2607 public: | |
2608 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2609 AbstractGangTask("ParKnownGarbageTask"), | |
2610 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2611 _g1(G1CollectedHeap::heap()) | |
2612 {} | |
2613 | |
2614 void work(int i) { | |
2615 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, _chunk_size, i); | |
2616 // Back to zero for the claim value. | |
355 | 2617 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, i, |
2618 HeapRegion::InitialClaimValue); | |
342 | 2619 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2620 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2621 if (G1PrintParCleanupStats) { | |
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2622 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
342 | 2623 i, parKnownGarbageCl.invokes(), regions_added); |
2624 } | |
2625 } | |
2626 }; | |
2627 | |
2628 void | |
2629 G1CollectorPolicy_BestRegionsFirst:: | |
2630 record_concurrent_mark_cleanup_end(size_t freed_bytes, | |
2631 size_t max_live_bytes) { | |
2632 double start; | |
2633 if (G1PrintParCleanupStats) start = os::elapsedTime(); | |
2634 record_concurrent_mark_cleanup_end_work1(freed_bytes, max_live_bytes); | |
2635 | |
2636 _collectionSetChooser->clearMarkedHeapRegions(); | |
2637 double clear_marked_end; | |
2638 if (G1PrintParCleanupStats) { | |
2639 clear_marked_end = os::elapsedTime(); | |
2640 gclog_or_tty->print_cr(" clear marked regions + work1: %8.3f ms.", | |
2641 (clear_marked_end - start)*1000.0); | |
2642 } | |
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2643 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2644 const size_t OverpartitionFactor = 4; |
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2645 const size_t MinWorkUnit = 8; |
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2646 const size_t WorkUnit = |
342 | 2647 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2648 MinWorkUnit); |
342 | 2649 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2650 WorkUnit); |
342 | 2651 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2652 (int) WorkUnit); |
342 | 2653 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2654 |
2655 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2656 "sanity check"); | |
342 | 2657 } else { |
2658 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2659 _g1->heap_region_iterate(&knownGarbagecl); | |
2660 } | |
2661 double known_garbage_end; | |
2662 if (G1PrintParCleanupStats) { | |
2663 known_garbage_end = os::elapsedTime(); | |
2664 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", | |
2665 (known_garbage_end - clear_marked_end)*1000.0); | |
2666 } | |
2667 _collectionSetChooser->sortMarkedHeapRegions(); | |
2668 double sort_end; | |
2669 if (G1PrintParCleanupStats) { | |
2670 sort_end = os::elapsedTime(); | |
2671 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
2672 (sort_end - known_garbage_end)*1000.0); | |
2673 } | |
2674 | |
2675 record_concurrent_mark_cleanup_end_work2(); | |
2676 double work2_end; | |
2677 if (G1PrintParCleanupStats) { | |
2678 work2_end = os::elapsedTime(); | |
2679 gclog_or_tty->print_cr(" work2: %8.3f ms.", | |
2680 (work2_end - sort_end)*1000.0); | |
2681 } | |
2682 } | |
2683 | |
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2684 // Add the heap region at the head of the non-incremental collection set |
342 | 2685 void G1CollectorPolicy:: |
2686 add_to_collection_set(HeapRegion* hr) { | |
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2687 assert(_inc_cset_build_state == Active, "Precondition"); |
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2688 assert(!hr->is_young(), "non-incremental add of young region"); |
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2689 |
342 | 2690 if (_g1->mark_in_progress()) |
2691 _g1->concurrent_mark()->registerCSetRegion(hr); | |
2692 | |
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2693 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2694 hr->set_in_collection_set(true); |
2695 hr->set_next_in_collection_set(_collection_set); | |
2696 _collection_set = hr; | |
2697 _collection_set_size++; | |
2698 _collection_set_bytes_used_before += hr->used(); | |
526 | 2699 _g1->register_region_with_in_cset_fast_test(hr); |
342 | 2700 } |
2701 | |
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2702 // Initialize the per-collection-set information |
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2703 void G1CollectorPolicy::start_incremental_cset_building() { |
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2704 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2705 |
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2706 _inc_cset_head = NULL; |
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2707 _inc_cset_tail = NULL; |
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2708 _inc_cset_size = 0; |
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2709 _inc_cset_bytes_used_before = 0; |
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2710 |
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2711 _inc_cset_young_index = 0; |
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2712 |
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2713 _inc_cset_max_finger = 0; |
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2714 _inc_cset_recorded_young_bytes = 0; |
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2715 _inc_cset_recorded_rs_lengths = 0; |
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2716 _inc_cset_predicted_elapsed_time_ms = 0; |
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2717 _inc_cset_predicted_bytes_to_copy = 0; |
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2718 _inc_cset_build_state = Active; |
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2719 } |
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2720 |
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2721 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t rs_length) { |
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2722 // This routine is used when: |
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2723 // * adding survivor regions to the incremental cset at the end of an |
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2724 // evacuation pause, |
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2725 // * adding the current allocation region to the incremental cset |
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2726 // when it is retired, and |
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2727 // * updating existing policy information for a region in the |
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2728 // incremental cset via young list RSet sampling. |
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2729 // Therefore this routine may be called at a safepoint by the |
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2730 // VM thread, or in-between safepoints by mutator threads (when |
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2731 // retiring the current allocation region) or a concurrent |
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2732 // refine thread (RSet sampling). |
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2733 |
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2734 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
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2735 size_t used_bytes = hr->used(); |
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2736 |
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2737 _inc_cset_recorded_rs_lengths += rs_length; |
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2738 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
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2739 |
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2740 _inc_cset_bytes_used_before += used_bytes; |
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2741 |
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2742 // Cache the values we have added to the aggregated informtion |
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2743 // in the heap region in case we have to remove this region from |
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|
2744 // 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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diff
changeset
|
2745 // rset sampling code |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2746 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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|
2747 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
|
2748 |
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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
|
2749 #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
|
2750 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
|
2751 _inc_cset_predicted_bytes_to_copy += bytes_to_copy; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2752 |
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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
|
2753 // 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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changeset
|
2754 _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
|
2755 |
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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
|
2756 // 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
|
2757 // 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
|
2758 // 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
|
2759 // 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
|
2760 hr->set_predicted_bytes_to_copy(bytes_to_copy); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2761 #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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diff
changeset
|
2762 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2763 |
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6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2764 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
|
2765 // This routine is currently only called as part of the updating of |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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changeset
|
2766 // existing policy information for regions in the incremental cset that |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2767 // is performed by the concurrent refine thread(s) as part of young list |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2768 // RSet sampling. Therefore we should not be at a safepoint. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2769 |
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
|
2770 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
|
2771 assert(hr->is_young(), "it should be"); |
1316cec51b4d
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diff
changeset
|
2772 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2773 size_t used_bytes = hr->used(); |
1316cec51b4d
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changeset
|
2774 size_t old_rs_length = hr->recorded_rs_length(); |
1316cec51b4d
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changeset
|
2775 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
|
2776 |
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
|
2777 // 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
|
2778 // 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
|
2779 _inc_cset_recorded_rs_lengths -= old_rs_length; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
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diff
changeset
|
2780 _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
|
2781 |
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 _inc_cset_bytes_used_before -= used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
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diff
changeset
|
2783 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2784 // Clear the values cached in the heap region |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2785 hr->set_recorded_rs_length(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2786 hr->set_predicted_elapsed_time_ms(0); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
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 #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
|
2789 size_t old_predicted_bytes_to_copy = hr->predicted_bytes_to_copy(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2790 _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
|
2791 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2792 // 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
|
2793 _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
|
2794 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2795 // 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
|
2796 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
|
2797 #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
|
2798 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2799 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2800 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
|
2801 // 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
|
2802 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
|
2803 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2804 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
|
2805 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
|
2806 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2807 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2808 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
|
2809 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
|
2810 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
|
2811 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
|
2812 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2813 // 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
|
2814 // 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
|
2815 // 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
|
2816 // 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
|
2817 // 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
|
2818 // 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
|
2819 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2820 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
|
2821 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
|
2822 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2823 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
|
2824 _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
|
2825 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2826 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
|
2827 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
|
2828 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
|
2829 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2830 _inc_cset_size++; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2831 _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
|
2832 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2833 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
|
2834 ++_inc_cset_young_index; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2835 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2836 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2837 // 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
|
2838 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
|
2839 // 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
|
2840 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
|
2841 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2842 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2843 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
|
2844 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2845 // 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
|
2846 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
|
2847 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
|
2848 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2849 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2850 _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
|
2851 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2852 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2853 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2854 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2855 // 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
|
2856 void G1CollectorPolicy::add_region_to_incremental_cset_lhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2857 // Survivors should be added to the RHS at the end of a pause |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2858 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
|
2859 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2860 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2861 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
|
2862 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2863 // 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
|
2864 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
|
2865 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
|
2866 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
|
2867 _inc_cset_tail = 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
johnc
parents:
1391
diff
changeset
|
2869 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2870 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2871 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2872 #ifndef PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2873 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2874 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2875 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2876 st->print_cr("\nCollection_set:"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2877 HeapRegion* csr = list_head; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2878 while (csr != NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2879 HeapRegion* next = csr->next_in_collection_set(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2880 assert(csr->in_collection_set(), "bad CS"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2881 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2882 "age: %4d, y: %d, surv: %d", |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2883 csr->bottom(), csr->end(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2884 csr->top(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2885 csr->prev_top_at_mark_start(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2886 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
|
2887 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
|
2888 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
|
2889 csr->is_young(), |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2890 csr->is_survivor()); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2891 csr = next; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2892 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2893 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2894 #endif // !PRODUCT |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2895 |
1707 | 2896 void |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2897 G1CollectorPolicy_BestRegionsFirst::choose_collection_set( |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2898 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
|
2899 // 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
|
2900 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
|
2901 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2902 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
|
2903 |
342 | 2904 start_recording_regions(); |
2905 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2906 guarantee(target_pause_time_ms > 0.0, |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2907 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
|
2908 target_pause_time_ms)); |
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2909 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2910 |
2911 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2912 double predicted_pause_time_ms = base_time_ms; | |
2913 | |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2914 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2915 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2916 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2917 "start choosing CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2918 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
|
2919 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2920 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
|
2921 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
|
2922 |
342 | 2923 // 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
|
2924 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
|
2925 if (time_remaining_ms < threshold) { |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2926 double prev_time_remaining_ms = time_remaining_ms; |
1656
4e5661ba9d98
6944166: G1: explicit GCs are not always handled correctly
tonyp
parents:
1611
diff
changeset
|
2927 time_remaining_ms = 0.50 * target_pause_time_ms; |
342 | 2928 _within_target = false; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2929 ergo_verbose3(ErgoCSetConstruction, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2930 "adjust remaining time", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2931 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
|
2932 ergo_format_ms("remaining time") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2933 ergo_format_ms("threshold") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2934 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
|
2935 prev_time_remaining_ms, threshold, time_remaining_ms); |
342 | 2936 } else { |
2937 _within_target = true; | |
2938 } | |
2939 | |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2940 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
|
2941 |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2942 HeapRegion* hr; |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2943 double young_start_time_sec = os::elapsedTime(); |
342 | 2944 |
677 | 2945 _collection_set_bytes_used_before = 0; |
2946 _collection_set_size = 0; | |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2947 _young_cset_length = 0; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2948 _last_young_gc_full = full_young_gcs() ? true : false; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2949 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2950 if (_last_young_gc_full) { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2951 ++_full_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2952 } else { |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2953 ++_partial_young_pause_num; |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2954 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2955 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2956 // 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
|
2957 // 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
|
2958 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2959 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2960 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
|
2961 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
|
2962 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
|
2963 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2964 while (hr != NULL) { |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2965 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2966 hr->set_young(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2967 hr = hr->get_next_young_region(); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2968 } |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2969 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2970 // 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
|
2971 young_list->clear_survivors(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2972 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2973 if (_g1->mark_in_progress()) |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2974 _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
|
2975 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2976 _young_cset_length = _inc_cset_young_index; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2977 _collection_set = _inc_cset_head; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2978 _collection_set_size = _inc_cset_size; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2979 _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
|
2980 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2981 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
|
2982 |
3914
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2983 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2984 "add young regions to CSet", |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2985 ergo_format_region("eden") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2986 ergo_format_region("survivors") |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2987 ergo_format_ms("predicted young region time"), |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2988 eden_region_num, survivor_region_num, |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2989 _inc_cset_predicted_elapsed_time_ms); |
20213c8a3c40
7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
tonyp
parents:
3868
diff
changeset
|
2990 |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2991 // The number of recorded young regions is the incremental |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2992 // collection set's current size |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
parents:
3830
diff
changeset
|
2993 set_recorded_young_regions(_inc_cset_size); |
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2994 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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2995 set_recorded_young_bytes(_inc_cset_recorded_young_bytes); |
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2996 #if PREDICTIONS_VERBOSE |
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2997 set_predicted_bytes_to_copy(_inc_cset_predicted_bytes_to_copy); |
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2998 #endif // PREDICTIONS_VERBOSE |
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2999 |
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3000 assert(_inc_cset_size == young_list->length(), "Invariant"); |
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3001 |
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3002 double young_end_time_sec = os::elapsedTime(); |
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3003 _recorded_young_cset_choice_time_ms = |
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3004 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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3005 |
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3006 // We are doing young collections so reset this. |
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3007 non_young_start_time_sec = young_end_time_sec; |
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3008 |
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3009 if (!full_young_gcs()) { |
342 | 3010 bool should_continue = true; |
3011 NumberSeq seq; | |
3012 double avg_prediction = 100000000000000000.0; // something very large | |
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3013 |
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3014 size_t prev_collection_set_size = _collection_set_size; |
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3015 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
342 | 3016 do { |
3017 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, | |
3018 avg_prediction); | |
677 | 3019 if (hr != NULL) { |
342 | 3020 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
3021 time_remaining_ms -= predicted_time_ms; | |
3022 predicted_pause_time_ms += predicted_time_ms; | |
3023 add_to_collection_set(hr); | |
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3024 record_non_young_cset_region(hr); |
342 | 3025 seq.add(predicted_time_ms); |
3026 avg_prediction = seq.avg() + seq.sd(); | |
3027 } | |
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3028 |
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3029 should_continue = true; |
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3030 if (hr == NULL) { |
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3031 // No need for an ergo verbose message here, |
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3032 // getNextMarkRegion() does this when it returns NULL. |
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3033 should_continue = false; |
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3034 } else { |
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3035 if (adaptive_young_list_length()) { |
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3036 if (time_remaining_ms < 0.0) { |
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3037 ergo_verbose1(ErgoCSetConstruction, |
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3038 "stop adding old regions to CSet", |
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3039 ergo_format_reason("remaining time is lower than 0") |
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3040 ergo_format_ms("remaining time"), |
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3041 time_remaining_ms); |
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3042 should_continue = false; |
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3043 } |
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3044 } else { |
3927
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3045 if (_collection_set_size >= _young_list_fixed_length) { |
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3046 ergo_verbose2(ErgoCSetConstruction, |
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3047 "stop adding old regions to CSet", |
3927
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3048 ergo_format_reason("CSet length reached target") |
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3049 ergo_format_region("CSet") |
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3050 ergo_format_region("young target"), |
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3051 _collection_set_size, _young_list_fixed_length); |
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3052 should_continue = false; |
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3053 } |
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3054 } |
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3055 } |
342 | 3056 } while (should_continue); |
3057 | |
3058 if (!adaptive_young_list_length() && | |
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3059 _collection_set_size < _young_list_fixed_length) { |
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3060 ergo_verbose2(ErgoCSetConstruction, |
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3061 "request partially-young GCs end", |
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3062 ergo_format_reason("CSet length lower than target") |
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3063 ergo_format_region("CSet") |
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3064 ergo_format_region("young target"), |
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3065 _collection_set_size, _young_list_fixed_length); |
342 | 3066 _should_revert_to_full_young_gcs = true; |
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3067 } |
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|
3068 |
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3069 old_region_num = _collection_set_size - prev_collection_set_size; |
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3070 |
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3071 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
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3072 "add old regions to CSet", |
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3073 ergo_format_region("old") |
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3074 ergo_format_ms("predicted old region time"), |
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3075 old_region_num, |
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3076 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
342 | 3077 } |
3078 | |
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3079 stop_incremental_cset_building(); |
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3080 |
342 | 3081 count_CS_bytes_used(); |
3082 | |
3083 end_recording_regions(); | |
3084 | |
3914
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3085 ergo_verbose5(ErgoCSetConstruction, |
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|
3086 "finish choosing CSet", |
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|
3087 ergo_format_region("eden") |
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3088 ergo_format_region("survivors") |
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|
3089 ergo_format_region("old") |
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|
3090 ergo_format_ms("predicted pause time") |
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|
3091 ergo_format_ms("target pause time"), |
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|
3092 eden_region_num, survivor_region_num, old_region_num, |
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|
3093 predicted_pause_time_ms, target_pause_time_ms); |
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3094 |
342 | 3095 double non_young_end_time_sec = os::elapsedTime(); |
3096 _recorded_non_young_cset_choice_time_ms = | |
3097 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
3098 } | |
3099 | |
3100 void G1CollectorPolicy_BestRegionsFirst::record_full_collection_end() { | |
3101 G1CollectorPolicy::record_full_collection_end(); | |
3102 _collectionSetChooser->updateAfterFullCollection(); | |
3103 } | |
3104 | |
3105 void G1CollectorPolicy_BestRegionsFirst:: | |
1707 | 3106 record_collection_pause_end() { |
3107 G1CollectorPolicy::record_collection_pause_end(); | |
342 | 3108 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); |
3109 } |