Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/g1CollectorPolicy.cpp @ 4829:9509c20bba28
6976060: G1: humongous object allocations should initiate marking cycles when necessary
Reviewed-by: tonyp, johnc
author | brutisso |
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date | Mon, 16 Jan 2012 22:10:05 +0100 |
parents | 2ace1c4ee8da |
children | 6a78aa6ac1ff |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, 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 // Different defaults for different number of GC threads | |
40 // They were chosen by running GCOld and SPECjbb on debris with different | |
41 // numbers of GC threads and choosing them based on the results | |
42 | |
43 // all the same | |
44 static double rs_length_diff_defaults[] = { | |
45 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 | |
46 }; | |
47 | |
48 static double cost_per_card_ms_defaults[] = { | |
49 0.01, 0.005, 0.005, 0.003, 0.003, 0.002, 0.002, 0.0015 | |
50 }; | |
51 | |
52 // all the same | |
4710 | 53 static double young_cards_per_entry_ratio_defaults[] = { |
342 | 54 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 |
55 }; | |
56 | |
57 static double cost_per_entry_ms_defaults[] = { | |
58 0.015, 0.01, 0.01, 0.008, 0.008, 0.0055, 0.0055, 0.005 | |
59 }; | |
60 | |
61 static double cost_per_byte_ms_defaults[] = { | |
62 0.00006, 0.00003, 0.00003, 0.000015, 0.000015, 0.00001, 0.00001, 0.000009 | |
63 }; | |
64 | |
65 // these should be pretty consistent | |
66 static double constant_other_time_ms_defaults[] = { | |
67 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0, 5.0 | |
68 }; | |
69 | |
70 | |
71 static double young_other_cost_per_region_ms_defaults[] = { | |
72 0.3, 0.2, 0.2, 0.15, 0.15, 0.12, 0.12, 0.1 | |
73 }; | |
74 | |
75 static double non_young_other_cost_per_region_ms_defaults[] = { | |
76 1.0, 0.7, 0.7, 0.5, 0.5, 0.42, 0.42, 0.30 | |
77 }; | |
78 | |
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79 // Help class for avoiding interleaved logging |
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80 class LineBuffer: public StackObj { |
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81 |
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82 private: |
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83 static const int BUFFER_LEN = 1024; |
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84 static const int INDENT_CHARS = 3; |
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85 char _buffer[BUFFER_LEN]; |
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86 int _indent_level; |
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87 int _cur; |
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88 |
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89 void vappend(const char* format, va_list ap) { |
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90 int res = vsnprintf(&_buffer[_cur], BUFFER_LEN - _cur, format, ap); |
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91 if (res != -1) { |
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92 _cur += res; |
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93 } else { |
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94 DEBUG_ONLY(warning("buffer too small in LineBuffer");) |
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95 _buffer[BUFFER_LEN -1] = 0; |
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96 _cur = BUFFER_LEN; // vsnprintf above should not add to _buffer if we are called again |
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97 } |
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98 } |
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99 |
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100 public: |
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101 explicit LineBuffer(int indent_level): _indent_level(indent_level), _cur(0) { |
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102 for (; (_cur < BUFFER_LEN && _cur < (_indent_level * INDENT_CHARS)); _cur++) { |
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103 _buffer[_cur] = ' '; |
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104 } |
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105 } |
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106 |
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107 #ifndef PRODUCT |
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108 ~LineBuffer() { |
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109 assert(_cur == _indent_level * INDENT_CHARS, "pending data in buffer - append_and_print_cr() not called?"); |
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110 } |
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111 #endif |
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112 |
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113 void append(const char* format, ...) { |
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114 va_list ap; |
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115 va_start(ap, format); |
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116 vappend(format, ap); |
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117 va_end(ap); |
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118 } |
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119 |
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120 void append_and_print_cr(const char* format, ...) { |
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121 va_list ap; |
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122 va_start(ap, format); |
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123 vappend(format, ap); |
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124 va_end(ap); |
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125 gclog_or_tty->print_cr("%s", _buffer); |
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126 _cur = _indent_level * INDENT_CHARS; |
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127 } |
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128 }; |
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129 |
342 | 130 G1CollectorPolicy::G1CollectorPolicy() : |
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131 _parallel_gc_threads(G1CollectedHeap::use_parallel_gc_threads() |
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132 ? ParallelGCThreads : 1), |
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133 |
342 | 134 _recent_gc_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), |
135 _all_pause_times_ms(new NumberSeq()), | |
136 _stop_world_start(0.0), | |
137 _all_stop_world_times_ms(new NumberSeq()), | |
138 _all_yield_times_ms(new NumberSeq()), | |
139 | |
677 | 140 _summary(new Summary()), |
342 | 141 |
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142 _cur_clear_ct_time_ms(0.0), |
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143 _mark_closure_time_ms(0.0), |
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144 |
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145 _cur_ref_proc_time_ms(0.0), |
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146 _cur_ref_enq_time_ms(0.0), |
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147 |
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148 #ifndef PRODUCT |
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149 _min_clear_cc_time_ms(-1.0), |
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150 _max_clear_cc_time_ms(-1.0), |
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151 _cur_clear_cc_time_ms(0.0), |
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152 _cum_clear_cc_time_ms(0.0), |
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153 _num_cc_clears(0L), |
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154 #endif |
342 | 155 |
156 _aux_num(10), | |
157 _all_aux_times_ms(new NumberSeq[_aux_num]), | |
158 _cur_aux_start_times_ms(new double[_aux_num]), | |
159 _cur_aux_times_ms(new double[_aux_num]), | |
160 _cur_aux_times_set(new bool[_aux_num]), | |
161 | |
162 _concurrent_mark_remark_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
163 _concurrent_mark_cleanup_times_ms(new TruncatedSeq(NumPrevPausesForHeuristics)), | |
164 | |
165 _alloc_rate_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
166 _prev_collection_pause_end_ms(0.0), | |
167 _pending_card_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
168 _rs_length_diff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
169 _cost_per_card_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
4710 | 170 _young_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), |
171 _mixed_cards_per_entry_ratio_seq(new TruncatedSeq(TruncatedSeqLength)), | |
342 | 172 _cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
4710 | 173 _mixed_cost_per_entry_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
342 | 174 _cost_per_byte_ms_seq(new TruncatedSeq(TruncatedSeqLength)), |
175 _cost_per_byte_ms_during_cm_seq(new TruncatedSeq(TruncatedSeqLength)), | |
176 _constant_other_time_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
177 _young_other_cost_per_region_ms_seq(new TruncatedSeq(TruncatedSeqLength)), | |
178 _non_young_other_cost_per_region_ms_seq( | |
179 new TruncatedSeq(TruncatedSeqLength)), | |
180 | |
181 _pending_cards_seq(new TruncatedSeq(TruncatedSeqLength)), | |
182 _rs_lengths_seq(new TruncatedSeq(TruncatedSeqLength)), | |
183 | |
751 | 184 _pause_time_target_ms((double) MaxGCPauseMillis), |
342 | 185 |
4710 | 186 _gcs_are_young(true), |
187 _young_pause_num(0), | |
188 _mixed_pause_num(0), | |
342 | 189 |
190 _during_marking(false), | |
191 _in_marking_window(false), | |
192 _in_marking_window_im(false), | |
193 | |
194 _known_garbage_ratio(0.0), | |
195 _known_garbage_bytes(0), | |
196 | |
197 _young_gc_eff_seq(new TruncatedSeq(TruncatedSeqLength)), | |
198 | |
4710 | 199 _recent_prev_end_times_for_all_gcs_sec( |
200 new TruncatedSeq(NumPrevPausesForHeuristics)), | |
342 | 201 |
202 _recent_avg_pause_time_ratio(0.0), | |
203 | |
204 _all_full_gc_times_ms(new NumberSeq()), | |
205 | |
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206 _initiate_conc_mark_if_possible(false), |
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207 _during_initial_mark_pause(false), |
4710 | 208 _should_revert_to_young_gcs(false), |
209 _last_young_gc(false), | |
210 _last_gc_was_young(false), | |
342 | 211 |
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212 _eden_bytes_before_gc(0), |
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213 _survivor_bytes_before_gc(0), |
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214 _capacity_before_gc(0), |
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215 |
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216 _eden_cset_region_length(0), |
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217 _survivor_cset_region_length(0), |
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218 _old_cset_region_length(0), |
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219 |
342 | 220 _collection_set(NULL), |
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221 _collection_set_bytes_used_before(0), |
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222 |
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223 // Incremental CSet attributes |
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224 _inc_cset_build_state(Inactive), |
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225 _inc_cset_head(NULL), |
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226 _inc_cset_tail(NULL), |
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227 _inc_cset_bytes_used_before(0), |
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228 _inc_cset_max_finger(NULL), |
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229 _inc_cset_recorded_rs_lengths(0), |
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230 _inc_cset_recorded_rs_lengths_diffs(0), |
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231 _inc_cset_predicted_elapsed_time_ms(0.0), |
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232 _inc_cset_predicted_elapsed_time_ms_diffs(0.0), |
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233 |
342 | 234 #ifdef _MSC_VER // the use of 'this' below gets a warning, make it go away |
235 #pragma warning( disable:4355 ) // 'this' : used in base member initializer list | |
236 #endif // _MSC_VER | |
237 | |
238 _short_lived_surv_rate_group(new SurvRateGroup(this, "Short Lived", | |
239 G1YoungSurvRateNumRegionsSummary)), | |
240 _survivor_surv_rate_group(new SurvRateGroup(this, "Survivor", | |
545 | 241 G1YoungSurvRateNumRegionsSummary)), |
342 | 242 // add here any more surv rate groups |
545 | 243 _recorded_survivor_regions(0), |
244 _recorded_survivor_head(NULL), | |
245 _recorded_survivor_tail(NULL), | |
1356 | 246 _survivors_age_table(true), |
247 | |
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248 _gc_overhead_perc(0.0) { |
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249 |
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250 // Set up the region size and associated fields. Given that the |
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251 // policy is created before the heap, we have to set this up here, |
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252 // so it's done as soon as possible. |
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253 HeapRegion::setup_heap_region_size(Arguments::min_heap_size()); |
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254 HeapRegionRemSet::setup_remset_size(); |
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255 |
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256 G1ErgoVerbose::initialize(); |
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257 if (PrintAdaptiveSizePolicy) { |
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258 // Currently, we only use a single switch for all the heuristics. |
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259 G1ErgoVerbose::set_enabled(true); |
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260 // Given that we don't currently have a verboseness level |
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261 // parameter, we'll hardcode this to high. This can be easily |
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262 // changed in the future. |
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263 G1ErgoVerbose::set_level(ErgoHigh); |
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264 } else { |
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265 G1ErgoVerbose::set_enabled(false); |
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266 } |
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267 |
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268 // Verify PLAB sizes |
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269 const size_t region_size = HeapRegion::GrainWords; |
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270 if (YoungPLABSize > region_size || OldPLABSize > region_size) { |
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271 char buffer[128]; |
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272 jio_snprintf(buffer, sizeof(buffer), "%sPLABSize should be at most "SIZE_FORMAT, |
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273 OldPLABSize > region_size ? "Old" : "Young", region_size); |
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274 vm_exit_during_initialization(buffer); |
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275 } |
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276 |
342 | 277 _recent_prev_end_times_for_all_gcs_sec->add(os::elapsedTime()); |
278 _prev_collection_pause_end_ms = os::elapsedTime() * 1000.0; | |
279 | |
1611 | 280 _par_last_gc_worker_start_times_ms = new double[_parallel_gc_threads]; |
342 | 281 _par_last_ext_root_scan_times_ms = new double[_parallel_gc_threads]; |
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282 _par_last_satb_filtering_times_ms = new double[_parallel_gc_threads]; |
342 | 283 |
284 _par_last_update_rs_times_ms = new double[_parallel_gc_threads]; | |
285 _par_last_update_rs_processed_buffers = new double[_parallel_gc_threads]; | |
286 | |
287 _par_last_scan_rs_times_ms = new double[_parallel_gc_threads]; | |
288 | |
289 _par_last_obj_copy_times_ms = new double[_parallel_gc_threads]; | |
290 | |
291 _par_last_termination_times_ms = new double[_parallel_gc_threads]; | |
1611 | 292 _par_last_termination_attempts = new double[_parallel_gc_threads]; |
293 _par_last_gc_worker_end_times_ms = new double[_parallel_gc_threads]; | |
2430 | 294 _par_last_gc_worker_times_ms = new double[_parallel_gc_threads]; |
4023 | 295 _par_last_gc_worker_other_times_ms = new double[_parallel_gc_threads]; |
342 | 296 |
297 // start conservatively | |
751 | 298 _expensive_region_limit_ms = 0.5 * (double) MaxGCPauseMillis; |
342 | 299 |
300 int index; | |
301 if (ParallelGCThreads == 0) | |
302 index = 0; | |
303 else if (ParallelGCThreads > 8) | |
304 index = 7; | |
305 else | |
306 index = ParallelGCThreads - 1; | |
307 | |
308 _pending_card_diff_seq->add(0.0); | |
309 _rs_length_diff_seq->add(rs_length_diff_defaults[index]); | |
310 _cost_per_card_ms_seq->add(cost_per_card_ms_defaults[index]); | |
4710 | 311 _young_cards_per_entry_ratio_seq->add( |
312 young_cards_per_entry_ratio_defaults[index]); | |
342 | 313 _cost_per_entry_ms_seq->add(cost_per_entry_ms_defaults[index]); |
314 _cost_per_byte_ms_seq->add(cost_per_byte_ms_defaults[index]); | |
315 _constant_other_time_ms_seq->add(constant_other_time_ms_defaults[index]); | |
316 _young_other_cost_per_region_ms_seq->add( | |
317 young_other_cost_per_region_ms_defaults[index]); | |
318 _non_young_other_cost_per_region_ms_seq->add( | |
319 non_young_other_cost_per_region_ms_defaults[index]); | |
320 | |
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321 // Below, we might need to calculate the pause time target based on |
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322 // the pause interval. When we do so we are going to give G1 maximum |
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323 // flexibility and allow it to do pauses when it needs to. So, we'll |
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324 // arrange that the pause interval to be pause time target + 1 to |
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325 // ensure that a) the pause time target is maximized with respect to |
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326 // the pause interval and b) we maintain the invariant that pause |
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327 // time target < pause interval. If the user does not want this |
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328 // maximum flexibility, they will have to set the pause interval |
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329 // explicitly. |
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330 |
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331 // First make sure that, if either parameter is set, its value is |
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332 // reasonable. |
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333 if (!FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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334 if (MaxGCPauseMillis < 1) { |
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335 vm_exit_during_initialization("MaxGCPauseMillis should be " |
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336 "greater than 0"); |
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337 } |
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338 } |
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339 if (!FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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340 if (GCPauseIntervalMillis < 1) { |
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341 vm_exit_during_initialization("GCPauseIntervalMillis should be " |
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342 "greater than 0"); |
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343 } |
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344 } |
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345 |
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346 // Then, if the pause time target parameter was not set, set it to |
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347 // the default value. |
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348 if (FLAG_IS_DEFAULT(MaxGCPauseMillis)) { |
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349 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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350 // The default pause time target in G1 is 200ms |
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351 FLAG_SET_DEFAULT(MaxGCPauseMillis, 200); |
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352 } else { |
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353 // We do not allow the pause interval to be set without the |
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354 // pause time target |
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355 vm_exit_during_initialization("GCPauseIntervalMillis cannot be set " |
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356 "without setting MaxGCPauseMillis"); |
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357 } |
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358 } |
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359 |
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360 // Then, if the interval parameter was not set, set it according to |
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361 // the pause time target (this will also deal with the case when the |
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362 // pause time target is the default value). |
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363 if (FLAG_IS_DEFAULT(GCPauseIntervalMillis)) { |
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364 FLAG_SET_DEFAULT(GCPauseIntervalMillis, MaxGCPauseMillis + 1); |
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365 } |
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366 |
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367 // Finally, make sure that the two parameters are consistent. |
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368 if (MaxGCPauseMillis >= GCPauseIntervalMillis) { |
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369 char buffer[256]; |
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370 jio_snprintf(buffer, 256, |
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371 "MaxGCPauseMillis (%u) should be less than " |
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372 "GCPauseIntervalMillis (%u)", |
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373 MaxGCPauseMillis, GCPauseIntervalMillis); |
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374 vm_exit_during_initialization(buffer); |
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375 } |
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376 |
751 | 377 double max_gc_time = (double) MaxGCPauseMillis / 1000.0; |
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378 double time_slice = (double) GCPauseIntervalMillis / 1000.0; |
342 | 379 _mmu_tracker = new G1MMUTrackerQueue(time_slice, max_gc_time); |
751 | 380 _sigma = (double) G1ConfidencePercent / 100.0; |
342 | 381 |
382 // start conservatively (around 50ms is about right) | |
383 _concurrent_mark_remark_times_ms->add(0.05); | |
384 _concurrent_mark_cleanup_times_ms->add(0.20); | |
385 _tenuring_threshold = MaxTenuringThreshold; | |
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386 // _max_survivor_regions will be calculated by |
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387 // update_young_list_target_length() during initialization. |
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388 _max_survivor_regions = 0; |
545 | 389 |
1356 | 390 assert(GCTimeRatio > 0, |
391 "we should have set it to a default value set_g1_gc_flags() " | |
392 "if a user set it to 0"); | |
393 _gc_overhead_perc = 100.0 * (1.0 / (1.0 + GCTimeRatio)); | |
394 | |
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395 uintx reserve_perc = G1ReservePercent; |
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396 // Put an artificial ceiling on this so that it's not set to a silly value. |
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397 if (reserve_perc > 50) { |
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398 reserve_perc = 50; |
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399 warning("G1ReservePercent is set to a value that is too large, " |
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400 "it's been updated to %u", reserve_perc); |
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401 } |
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402 _reserve_factor = (double) reserve_perc / 100.0; |
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403 // This will be set when the heap is expanded |
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404 // for the first time during initialization. |
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405 _reserve_regions = 0; |
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406 |
342 | 407 initialize_all(); |
4013 | 408 _collectionSetChooser = new CollectionSetChooser(); |
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409 _young_gen_sizer = new G1YoungGenSizer(); // Must be after call to initialize_flags |
342 | 410 } |
411 | |
412 void G1CollectorPolicy::initialize_flags() { | |
413 set_min_alignment(HeapRegion::GrainBytes); | |
414 set_max_alignment(GenRemSet::max_alignment_constraint(rem_set_name())); | |
547
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415 if (SurvivorRatio < 1) { |
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416 vm_exit_during_initialization("Invalid survivor ratio specified"); |
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417 } |
342 | 418 CollectorPolicy::initialize_flags(); |
419 } | |
420 | |
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421 G1YoungGenSizer::G1YoungGenSizer() : _sizer_kind(SizerDefaults), _adaptive_size(true) { |
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422 assert(G1DefaultMinNewGenPercent <= G1DefaultMaxNewGenPercent, "Min larger than max"); |
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423 assert(G1DefaultMinNewGenPercent > 0 && G1DefaultMinNewGenPercent < 100, "Min out of bounds"); |
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424 assert(G1DefaultMaxNewGenPercent > 0 && G1DefaultMaxNewGenPercent < 100, "Max out of bounds"); |
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425 |
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426 if (FLAG_IS_CMDLINE(NewRatio)) { |
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427 if (FLAG_IS_CMDLINE(NewSize) || FLAG_IS_CMDLINE(MaxNewSize)) { |
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428 warning("-XX:NewSize and -XX:MaxNewSize override -XX:NewRatio"); |
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429 } else { |
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430 _sizer_kind = SizerNewRatio; |
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431 _adaptive_size = false; |
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432 return; |
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433 } |
3976 | 434 } |
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435 |
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436 if (FLAG_IS_CMDLINE(NewSize)) { |
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437 _min_desired_young_length = MAX2((size_t) 1, NewSize / HeapRegion::GrainBytes); |
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438 if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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439 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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440 _sizer_kind = SizerMaxAndNewSize; |
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441 _adaptive_size = _min_desired_young_length == _max_desired_young_length; |
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442 } else { |
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443 _sizer_kind = SizerNewSizeOnly; |
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444 } |
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445 } else if (FLAG_IS_CMDLINE(MaxNewSize)) { |
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446 _max_desired_young_length = MAX2((size_t) 1, MaxNewSize / HeapRegion::GrainBytes); |
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447 _sizer_kind = SizerMaxNewSizeOnly; |
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448 } |
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449 } |
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450 |
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451 size_t G1YoungGenSizer::calculate_default_min_length(size_t new_number_of_heap_regions) { |
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452 size_t default_value = (new_number_of_heap_regions * G1DefaultMinNewGenPercent) / 100; |
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453 return MAX2((size_t)1, default_value); |
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454 } |
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455 |
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456 size_t G1YoungGenSizer::calculate_default_max_length(size_t new_number_of_heap_regions) { |
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457 size_t default_value = (new_number_of_heap_regions * G1DefaultMaxNewGenPercent) / 100; |
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458 return MAX2((size_t)1, default_value); |
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459 } |
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460 |
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461 void G1YoungGenSizer::heap_size_changed(size_t new_number_of_heap_regions) { |
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462 assert(new_number_of_heap_regions > 0, "Heap must be initialized"); |
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463 |
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464 switch (_sizer_kind) { |
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465 case SizerDefaults: |
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466 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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467 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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468 break; |
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469 case SizerNewSizeOnly: |
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470 _max_desired_young_length = calculate_default_max_length(new_number_of_heap_regions); |
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471 _max_desired_young_length = MAX2(_min_desired_young_length, _max_desired_young_length); |
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472 break; |
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473 case SizerMaxNewSizeOnly: |
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474 _min_desired_young_length = calculate_default_min_length(new_number_of_heap_regions); |
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475 _min_desired_young_length = MIN2(_min_desired_young_length, _max_desired_young_length); |
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476 break; |
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477 case SizerMaxAndNewSize: |
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478 // Do nothing. Values set on the command line, don't update them at runtime. |
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479 break; |
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480 case SizerNewRatio: |
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481 _min_desired_young_length = new_number_of_heap_regions / (NewRatio + 1); |
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482 _max_desired_young_length = _min_desired_young_length; |
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483 break; |
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484 default: |
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485 ShouldNotReachHere(); |
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486 } |
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487 |
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488 assert(_min_desired_young_length <= _max_desired_young_length, "Invalid min/max young gen size values"); |
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489 } |
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490 |
342 | 491 void G1CollectorPolicy::init() { |
492 // Set aside an initial future to_space. | |
493 _g1 = G1CollectedHeap::heap(); | |
494 | |
495 assert(Heap_lock->owned_by_self(), "Locking discipline."); | |
496 | |
545 | 497 initialize_gc_policy_counters(); |
498 | |
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499 if (adaptive_young_list_length()) { |
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500 _young_list_fixed_length = 0; |
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501 } else { |
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502 _young_list_fixed_length = _young_gen_sizer->min_desired_young_length(); |
342 | 503 } |
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504 _free_regions_at_end_of_collection = _g1->free_regions(); |
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505 update_young_list_target_length(); |
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506 _prev_eden_capacity = _young_list_target_length * HeapRegion::GrainBytes; |
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507 |
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508 // We may immediately start allocating regions and placing them on the |
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509 // collection set list. Initialize the per-collection set info |
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510 start_incremental_cset_building(); |
342 | 511 } |
512 | |
545 | 513 // Create the jstat counters for the policy. |
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514 void G1CollectorPolicy::initialize_gc_policy_counters() { |
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515 _gc_policy_counters = new GCPolicyCounters("GarbageFirst", 1, 3); |
545 | 516 } |
517 | |
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518 bool G1CollectorPolicy::predict_will_fit(size_t young_length, |
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519 double base_time_ms, |
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520 size_t base_free_regions, |
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521 double target_pause_time_ms) { |
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522 if (young_length >= base_free_regions) { |
342 | 523 // end condition 1: not enough space for the young regions |
524 return false; | |
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525 } |
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526 |
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527 double accum_surv_rate = accum_yg_surv_rate_pred((int)(young_length - 1)); |
342 | 528 size_t bytes_to_copy = |
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529 (size_t) (accum_surv_rate * (double) HeapRegion::GrainBytes); |
342 | 530 double copy_time_ms = predict_object_copy_time_ms(bytes_to_copy); |
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531 double young_other_time_ms = predict_young_other_time_ms(young_length); |
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532 double pause_time_ms = base_time_ms + copy_time_ms + young_other_time_ms; |
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533 if (pause_time_ms > target_pause_time_ms) { |
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534 // end condition 2: prediction is over the target pause time |
342 | 535 return false; |
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536 } |
342 | 537 |
538 size_t free_bytes = | |
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539 (base_free_regions - young_length) * HeapRegion::GrainBytes; |
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540 if ((2.0 * sigma()) * (double) bytes_to_copy > (double) free_bytes) { |
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541 // end condition 3: out-of-space (conservatively!) |
342 | 542 return false; |
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543 } |
342 | 544 |
545 // success! | |
546 return true; | |
547 } | |
548 | |
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549 void G1CollectorPolicy::record_new_heap_size(size_t new_number_of_regions) { |
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550 // re-calculate the necessary reserve |
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551 double reserve_regions_d = (double) new_number_of_regions * _reserve_factor; |
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552 // We use ceiling so that if reserve_regions_d is > 0.0 (but |
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553 // smaller than 1.0) we'll get 1. |
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554 _reserve_regions = (size_t) ceil(reserve_regions_d); |
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555 |
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556 _young_gen_sizer->heap_size_changed(new_number_of_regions); |
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557 } |
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558 |
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559 size_t G1CollectorPolicy::calculate_young_list_desired_min_length( |
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560 size_t base_min_length) { |
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561 size_t desired_min_length = 0; |
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562 if (adaptive_young_list_length()) { |
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563 if (_alloc_rate_ms_seq->num() > 3) { |
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564 double now_sec = os::elapsedTime(); |
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565 double when_ms = _mmu_tracker->when_max_gc_sec(now_sec) * 1000.0; |
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566 double alloc_rate_ms = predict_alloc_rate_ms(); |
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567 desired_min_length = (size_t) ceil(alloc_rate_ms * when_ms); |
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568 } else { |
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569 // otherwise we don't have enough info to make the prediction |
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570 } |
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571 } |
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572 desired_min_length += base_min_length; |
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573 // make sure we don't go below any user-defined minimum bound |
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574 return MAX2(_young_gen_sizer->min_desired_young_length(), desired_min_length); |
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575 } |
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576 |
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577 size_t G1CollectorPolicy::calculate_young_list_desired_max_length() { |
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578 // Here, we might want to also take into account any additional |
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579 // constraints (i.e., user-defined minimum bound). Currently, we |
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580 // effectively don't set this bound. |
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581 return _young_gen_sizer->max_desired_young_length(); |
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582 } |
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583 |
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584 void G1CollectorPolicy::update_young_list_target_length(size_t rs_lengths) { |
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585 if (rs_lengths == (size_t) -1) { |
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586 // if it's set to the default value (-1), we should predict it; |
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587 // otherwise, use the given value. |
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588 rs_lengths = (size_t) get_new_prediction(_rs_lengths_seq); |
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589 } |
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590 |
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591 // Calculate the absolute and desired min bounds. |
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592 |
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593 // This is how many young regions we already have (currently: the survivors). |
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594 size_t base_min_length = recorded_survivor_regions(); |
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595 // This is the absolute minimum young length, which ensures that we |
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596 // can allocate one eden region in the worst-case. |
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597 size_t absolute_min_length = base_min_length + 1; |
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598 size_t desired_min_length = |
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599 calculate_young_list_desired_min_length(base_min_length); |
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600 if (desired_min_length < absolute_min_length) { |
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601 desired_min_length = absolute_min_length; |
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602 } |
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603 |
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604 // Calculate the absolute and desired max bounds. |
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605 |
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606 // We will try our best not to "eat" into the reserve. |
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607 size_t absolute_max_length = 0; |
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608 if (_free_regions_at_end_of_collection > _reserve_regions) { |
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609 absolute_max_length = _free_regions_at_end_of_collection - _reserve_regions; |
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610 } |
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611 size_t desired_max_length = calculate_young_list_desired_max_length(); |
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612 if (desired_max_length > absolute_max_length) { |
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613 desired_max_length = absolute_max_length; |
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614 } |
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615 |
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616 size_t young_list_target_length = 0; |
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617 if (adaptive_young_list_length()) { |
4710 | 618 if (gcs_are_young()) { |
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619 young_list_target_length = |
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620 calculate_young_list_target_length(rs_lengths, |
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621 base_min_length, |
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622 desired_min_length, |
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623 desired_max_length); |
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624 _rs_lengths_prediction = rs_lengths; |
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625 } else { |
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626 // Don't calculate anything and let the code below bound it to |
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627 // the desired_min_length, i.e., do the next GC as soon as |
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628 // possible to maximize how many old regions we can add to it. |
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629 } |
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630 } else { |
4710 | 631 if (gcs_are_young()) { |
3919
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632 young_list_target_length = _young_list_fixed_length; |
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633 } else { |
4710 | 634 // A bit arbitrary: during mixed GCs we allocate half |
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635 // the young regions to try to add old regions to the CSet. |
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636 young_list_target_length = _young_list_fixed_length / 2; |
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637 // We choose to accept that we might go under the desired min |
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638 // length given that we intentionally ask for a smaller young gen. |
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639 desired_min_length = absolute_min_length; |
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640 } |
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641 } |
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642 |
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643 // Make sure we don't go over the desired max length, nor under the |
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644 // desired min length. In case they clash, desired_min_length wins |
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645 // which is why that test is second. |
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646 if (young_list_target_length > desired_max_length) { |
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647 young_list_target_length = desired_max_length; |
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648 } |
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649 if (young_list_target_length < desired_min_length) { |
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650 young_list_target_length = desired_min_length; |
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651 } |
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652 |
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653 assert(young_list_target_length > recorded_survivor_regions(), |
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654 "we should be able to allocate at least one eden region"); |
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655 assert(young_list_target_length >= absolute_min_length, "post-condition"); |
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656 _young_list_target_length = young_list_target_length; |
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657 |
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658 update_max_gc_locker_expansion(); |
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659 } |
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660 |
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661 size_t |
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662 G1CollectorPolicy::calculate_young_list_target_length(size_t rs_lengths, |
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663 size_t base_min_length, |
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664 size_t desired_min_length, |
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665 size_t desired_max_length) { |
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666 assert(adaptive_young_list_length(), "pre-condition"); |
4710 | 667 assert(gcs_are_young(), "only call this for young GCs"); |
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668 |
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669 // In case some edge-condition makes the desired max length too small... |
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670 if (desired_max_length <= desired_min_length) { |
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671 return desired_min_length; |
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672 } |
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673 |
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674 // We'll adjust min_young_length and max_young_length not to include |
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675 // the already allocated young regions (i.e., so they reflect the |
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676 // min and max eden regions we'll allocate). The base_min_length |
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677 // will be reflected in the predictions by the |
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678 // survivor_regions_evac_time prediction. |
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679 assert(desired_min_length > base_min_length, "invariant"); |
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680 size_t min_young_length = desired_min_length - base_min_length; |
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681 assert(desired_max_length > base_min_length, "invariant"); |
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682 size_t max_young_length = desired_max_length - base_min_length; |
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683 |
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684 double target_pause_time_ms = _mmu_tracker->max_gc_time() * 1000.0; |
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685 double survivor_regions_evac_time = predict_survivor_regions_evac_time(); |
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686 size_t pending_cards = (size_t) get_new_prediction(_pending_cards_seq); |
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687 size_t adj_rs_lengths = rs_lengths + predict_rs_length_diff(); |
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688 size_t scanned_cards = predict_young_card_num(adj_rs_lengths); |
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689 double base_time_ms = |
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690 predict_base_elapsed_time_ms(pending_cards, scanned_cards) + |
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691 survivor_regions_evac_time; |
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692 size_t available_free_regions = _free_regions_at_end_of_collection; |
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693 size_t base_free_regions = 0; |
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694 if (available_free_regions > _reserve_regions) { |
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695 base_free_regions = available_free_regions - _reserve_regions; |
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696 } |
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697 |
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698 // Here, we will make sure that the shortest young length that |
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699 // makes sense fits within the target pause time. |
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700 |
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701 if (predict_will_fit(min_young_length, base_time_ms, |
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702 base_free_regions, target_pause_time_ms)) { |
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703 // The shortest young length will fit into the target pause time; |
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704 // we'll now check whether the absolute maximum number of young |
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705 // regions will fit in the target pause time. If not, we'll do |
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706 // a binary search between min_young_length and max_young_length. |
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707 if (predict_will_fit(max_young_length, base_time_ms, |
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708 base_free_regions, target_pause_time_ms)) { |
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709 // The maximum young length will fit into the target pause time. |
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710 // We are done so set min young length to the maximum length (as |
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711 // the result is assumed to be returned in min_young_length). |
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712 min_young_length = max_young_length; |
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713 } else { |
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714 // The maximum possible number of young regions will not fit within |
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715 // the target pause time so we'll search for the optimal |
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716 // length. The loop invariants are: |
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717 // |
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718 // min_young_length < max_young_length |
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719 // min_young_length is known to fit into the target pause time |
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720 // max_young_length is known not to fit into the target pause time |
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721 // |
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722 // Going into the loop we know the above hold as we've just |
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723 // checked them. Every time around the loop we check whether |
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724 // the middle value between min_young_length and |
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725 // max_young_length fits into the target pause time. If it |
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726 // does, it becomes the new min. If it doesn't, it becomes |
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727 // the new max. This way we maintain the loop invariants. |
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728 |
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729 assert(min_young_length < max_young_length, "invariant"); |
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730 size_t diff = (max_young_length - min_young_length) / 2; |
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731 while (diff > 0) { |
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732 size_t young_length = min_young_length + diff; |
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733 if (predict_will_fit(young_length, base_time_ms, |
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734 base_free_regions, target_pause_time_ms)) { |
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735 min_young_length = young_length; |
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736 } else { |
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737 max_young_length = young_length; |
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738 } |
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739 assert(min_young_length < max_young_length, "invariant"); |
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740 diff = (max_young_length - min_young_length) / 2; |
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741 } |
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742 // The results is min_young_length which, according to the |
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743 // loop invariants, should fit within the target pause time. |
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744 |
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745 // These are the post-conditions of the binary search above: |
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746 assert(min_young_length < max_young_length, |
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747 "otherwise we should have discovered that max_young_length " |
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748 "fits into the pause target and not done the binary search"); |
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749 assert(predict_will_fit(min_young_length, base_time_ms, |
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750 base_free_regions, target_pause_time_ms), |
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751 "min_young_length, the result of the binary search, should " |
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752 "fit into the pause target"); |
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753 assert(!predict_will_fit(min_young_length + 1, base_time_ms, |
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754 base_free_regions, target_pause_time_ms), |
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755 "min_young_length, the result of the binary search, should be " |
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756 "optimal, so no larger length should fit into the pause target"); |
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757 } |
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758 } else { |
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759 // Even the minimum length doesn't fit into the pause time |
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760 // target, return it as the result nevertheless. |
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761 } |
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762 return base_min_length + min_young_length; |
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763 } |
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764 |
545 | 765 double G1CollectorPolicy::predict_survivor_regions_evac_time() { |
766 double survivor_regions_evac_time = 0.0; | |
767 for (HeapRegion * r = _recorded_survivor_head; | |
768 r != NULL && r != _recorded_survivor_tail->get_next_young_region(); | |
769 r = r->get_next_young_region()) { | |
770 survivor_regions_evac_time += predict_region_elapsed_time_ms(r, true); | |
771 } | |
772 return survivor_regions_evac_time; | |
773 } | |
774 | |
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775 void G1CollectorPolicy::revise_young_list_target_length_if_necessary() { |
342 | 776 guarantee( adaptive_young_list_length(), "should not call this otherwise" ); |
777 | |
1394
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778 size_t rs_lengths = _g1->young_list()->sampled_rs_lengths(); |
342 | 779 if (rs_lengths > _rs_lengths_prediction) { |
780 // add 10% to avoid having to recalculate often | |
781 size_t rs_lengths_prediction = rs_lengths * 1100 / 1000; | |
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782 update_young_list_target_length(rs_lengths_prediction); |
342 | 783 } |
784 } | |
785 | |
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786 |
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787 |
342 | 788 HeapWord* G1CollectorPolicy::mem_allocate_work(size_t size, |
789 bool is_tlab, | |
790 bool* gc_overhead_limit_was_exceeded) { | |
791 guarantee(false, "Not using this policy feature yet."); | |
792 return NULL; | |
793 } | |
794 | |
795 // This method controls how a collector handles one or more | |
796 // of its generations being fully allocated. | |
797 HeapWord* G1CollectorPolicy::satisfy_failed_allocation(size_t size, | |
798 bool is_tlab) { | |
799 guarantee(false, "Not using this policy feature yet."); | |
800 return NULL; | |
801 } | |
802 | |
803 | |
804 #ifndef PRODUCT | |
805 bool G1CollectorPolicy::verify_young_ages() { | |
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806 HeapRegion* head = _g1->young_list()->first_region(); |
342 | 807 return |
808 verify_young_ages(head, _short_lived_surv_rate_group); | |
809 // also call verify_young_ages on any additional surv rate groups | |
810 } | |
811 | |
812 bool | |
813 G1CollectorPolicy::verify_young_ages(HeapRegion* head, | |
814 SurvRateGroup *surv_rate_group) { | |
815 guarantee( surv_rate_group != NULL, "pre-condition" ); | |
816 | |
817 const char* name = surv_rate_group->name(); | |
818 bool ret = true; | |
819 int prev_age = -1; | |
820 | |
821 for (HeapRegion* curr = head; | |
822 curr != NULL; | |
823 curr = curr->get_next_young_region()) { | |
824 SurvRateGroup* group = curr->surv_rate_group(); | |
825 if (group == NULL && !curr->is_survivor()) { | |
826 gclog_or_tty->print_cr("## %s: encountered NULL surv_rate_group", name); | |
827 ret = false; | |
828 } | |
829 | |
830 if (surv_rate_group == group) { | |
831 int age = curr->age_in_surv_rate_group(); | |
832 | |
833 if (age < 0) { | |
834 gclog_or_tty->print_cr("## %s: encountered negative age", name); | |
835 ret = false; | |
836 } | |
837 | |
838 if (age <= prev_age) { | |
839 gclog_or_tty->print_cr("## %s: region ages are not strictly increasing " | |
840 "(%d, %d)", name, age, prev_age); | |
841 ret = false; | |
842 } | |
843 prev_age = age; | |
844 } | |
845 } | |
846 | |
847 return ret; | |
848 } | |
849 #endif // PRODUCT | |
850 | |
851 void G1CollectorPolicy::record_full_collection_start() { | |
852 _cur_collection_start_sec = os::elapsedTime(); | |
853 // Release the future to-space so that it is available for compaction into. | |
854 _g1->set_full_collection(); | |
855 } | |
856 | |
857 void G1CollectorPolicy::record_full_collection_end() { | |
858 // Consider this like a collection pause for the purposes of allocation | |
859 // since last pause. | |
860 double end_sec = os::elapsedTime(); | |
861 double full_gc_time_sec = end_sec - _cur_collection_start_sec; | |
862 double full_gc_time_ms = full_gc_time_sec * 1000.0; | |
863 | |
864 _all_full_gc_times_ms->add(full_gc_time_ms); | |
865 | |
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866 update_recent_gc_times(end_sec, full_gc_time_ms); |
342 | 867 |
868 _g1->clear_full_collection(); | |
869 | |
4710 | 870 // "Nuke" the heuristics that control the young/mixed GC |
871 // transitions and make sure we start with young GCs after the Full GC. | |
872 set_gcs_are_young(true); | |
873 _last_young_gc = false; | |
874 _should_revert_to_young_gcs = false; | |
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875 clear_initiate_conc_mark_if_possible(); |
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876 clear_during_initial_mark_pause(); |
342 | 877 _known_garbage_bytes = 0; |
878 _known_garbage_ratio = 0.0; | |
879 _in_marking_window = false; | |
880 _in_marking_window_im = false; | |
881 | |
882 _short_lived_surv_rate_group->start_adding_regions(); | |
883 // also call this on any additional surv rate groups | |
884 | |
545 | 885 record_survivor_regions(0, NULL, NULL); |
886 | |
342 | 887 _free_regions_at_end_of_collection = _g1->free_regions(); |
545 | 888 // Reset survivors SurvRateGroup. |
889 _survivor_surv_rate_group->reset(); | |
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890 update_young_list_target_length(); |
4013 | 891 _collectionSetChooser->updateAfterFullCollection(); |
1973 | 892 } |
342 | 893 |
894 void G1CollectorPolicy::record_stop_world_start() { | |
895 _stop_world_start = os::elapsedTime(); | |
896 } | |
897 | |
898 void G1CollectorPolicy::record_collection_pause_start(double start_time_sec, | |
899 size_t start_used) { | |
900 if (PrintGCDetails) { | |
901 gclog_or_tty->stamp(PrintGCTimeStamps); | |
902 gclog_or_tty->print("[GC pause"); | |
4710 | 903 gclog_or_tty->print(" (%s)", gcs_are_young() ? "young" : "mixed"); |
342 | 904 } |
905 | |
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906 if (!during_initial_mark_pause()) { |
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907 // We only need to do this here as the policy will only be applied |
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908 // to the GC we're about to start. so, no point is calculating this |
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909 // every time we calculate / recalculate the target young length. |
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910 update_survivors_policy(); |
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911 } else { |
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912 // The marking phase has a "we only copy implicitly live |
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913 // objects during marking" invariant. The easiest way to ensure it |
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914 // holds is not to allocate any survivor regions and tenure all |
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915 // objects. In the future we might change this and handle survivor |
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916 // regions specially during marking. |
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917 tenure_all_objects(); |
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918 } |
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919 |
1973 | 920 assert(_g1->used() == _g1->recalculate_used(), |
921 err_msg("sanity, used: "SIZE_FORMAT" recalculate_used: "SIZE_FORMAT, | |
922 _g1->used(), _g1->recalculate_used())); | |
342 | 923 |
924 double s_w_t_ms = (start_time_sec - _stop_world_start) * 1000.0; | |
925 _all_stop_world_times_ms->add(s_w_t_ms); | |
926 _stop_world_start = 0.0; | |
927 | |
928 _cur_collection_start_sec = start_time_sec; | |
929 _cur_collection_pause_used_at_start_bytes = start_used; | |
930 _cur_collection_pause_used_regions_at_start = _g1->used_regions(); | |
931 _pending_cards = _g1->pending_card_num(); | |
932 _max_pending_cards = _g1->max_pending_card_num(); | |
933 | |
934 _bytes_in_collection_set_before_gc = 0; | |
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935 _bytes_copied_during_gc = 0; |
342 | 936 |
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937 YoungList* young_list = _g1->young_list(); |
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938 _eden_bytes_before_gc = young_list->eden_used_bytes(); |
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939 _survivor_bytes_before_gc = young_list->survivor_used_bytes(); |
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940 _capacity_before_gc = _g1->capacity(); |
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941 |
342 | 942 #ifdef DEBUG |
943 // initialise these to something well known so that we can spot | |
944 // if they are not set properly | |
945 | |
946 for (int i = 0; i < _parallel_gc_threads; ++i) { | |
1611 | 947 _par_last_gc_worker_start_times_ms[i] = -1234.0; |
948 _par_last_ext_root_scan_times_ms[i] = -1234.0; | |
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949 _par_last_satb_filtering_times_ms[i] = -1234.0; |
1611 | 950 _par_last_update_rs_times_ms[i] = -1234.0; |
951 _par_last_update_rs_processed_buffers[i] = -1234.0; | |
952 _par_last_scan_rs_times_ms[i] = -1234.0; | |
953 _par_last_obj_copy_times_ms[i] = -1234.0; | |
954 _par_last_termination_times_ms[i] = -1234.0; | |
955 _par_last_termination_attempts[i] = -1234.0; | |
956 _par_last_gc_worker_end_times_ms[i] = -1234.0; | |
2430 | 957 _par_last_gc_worker_times_ms[i] = -1234.0; |
4023 | 958 _par_last_gc_worker_other_times_ms[i] = -1234.0; |
342 | 959 } |
960 #endif | |
961 | |
962 for (int i = 0; i < _aux_num; ++i) { | |
963 _cur_aux_times_ms[i] = 0.0; | |
964 _cur_aux_times_set[i] = false; | |
965 } | |
966 | |
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967 // This is initialized to zero here and is set during |
4023 | 968 // the evacuation pause if marking is in progress. |
969 _cur_satb_drain_time_ms = 0.0; | |
342 | 970 |
4710 | 971 _last_gc_was_young = false; |
342 | 972 |
973 // do that for any other surv rate groups | |
974 _short_lived_surv_rate_group->stop_adding_regions(); | |
1282 | 975 _survivors_age_table.clear(); |
545 | 976 |
342 | 977 assert( verify_young_ages(), "region age verification" ); |
978 } | |
979 | |
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980 void G1CollectorPolicy::record_concurrent_mark_init_end(double |
342 | 981 mark_init_elapsed_time_ms) { |
982 _during_marking = true; | |
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983 assert(!initiate_conc_mark_if_possible(), "we should have cleared it by now"); |
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984 clear_during_initial_mark_pause(); |
342 | 985 _cur_mark_stop_world_time_ms = mark_init_elapsed_time_ms; |
986 } | |
987 | |
988 void G1CollectorPolicy::record_concurrent_mark_remark_start() { | |
989 _mark_remark_start_sec = os::elapsedTime(); | |
990 _during_marking = false; | |
991 } | |
992 | |
993 void G1CollectorPolicy::record_concurrent_mark_remark_end() { | |
994 double end_time_sec = os::elapsedTime(); | |
995 double elapsed_time_ms = (end_time_sec - _mark_remark_start_sec)*1000.0; | |
996 _concurrent_mark_remark_times_ms->add(elapsed_time_ms); | |
997 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
998 _prev_collection_pause_end_ms += elapsed_time_ms; | |
999 | |
1000 _mmu_tracker->add_pause(_mark_remark_start_sec, end_time_sec, true); | |
1001 } | |
1002 | |
1003 void G1CollectorPolicy::record_concurrent_mark_cleanup_start() { | |
1004 _mark_cleanup_start_sec = os::elapsedTime(); | |
1005 } | |
1006 | |
4013 | 1007 void G1CollectorPolicy::record_concurrent_mark_cleanup_completed() { |
4710 | 1008 _should_revert_to_young_gcs = false; |
1009 _last_young_gc = true; | |
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1010 _in_marking_window = false; |
342 | 1011 } |
1012 | |
1013 void G1CollectorPolicy::record_concurrent_pause() { | |
1014 if (_stop_world_start > 0.0) { | |
1015 double yield_ms = (os::elapsedTime() - _stop_world_start) * 1000.0; | |
1016 _all_yield_times_ms->add(yield_ms); | |
1017 } | |
1018 } | |
1019 | |
1020 void G1CollectorPolicy::record_concurrent_pause_end() { | |
1021 } | |
1022 | |
1023 template<class T> | |
1024 T sum_of(T* sum_arr, int start, int n, int N) { | |
1025 T sum = (T)0; | |
1026 for (int i = 0; i < n; i++) { | |
1027 int j = (start + i) % N; | |
1028 sum += sum_arr[j]; | |
1029 } | |
1030 return sum; | |
1031 } | |
1032 | |
1611 | 1033 void G1CollectorPolicy::print_par_stats(int level, |
1034 const char* str, | |
2430 | 1035 double* data) { |
342 | 1036 double min = data[0], max = data[0]; |
1037 double total = 0.0; | |
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1038 LineBuffer buf(level); |
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1039 buf.append("[%s (ms):", str); |
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1040 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1041 double val = data[i]; |
1042 if (val < min) | |
1043 min = val; | |
1044 if (val > max) | |
1045 max = val; | |
1046 total += val; | |
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1047 buf.append(" %3.1lf", val); |
342 | 1048 } |
2430 | 1049 buf.append_and_print_cr(""); |
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1050 double avg = total / (double) no_of_gc_threads(); |
2430 | 1051 buf.append_and_print_cr(" Avg: %5.1lf, Min: %5.1lf, Max: %5.1lf, Diff: %5.1lf]", |
1052 avg, min, max, max - min); | |
342 | 1053 } |
1054 | |
1611 | 1055 void G1CollectorPolicy::print_par_sizes(int level, |
1056 const char* str, | |
2430 | 1057 double* data) { |
342 | 1058 double min = data[0], max = data[0]; |
1059 double total = 0.0; | |
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1060 LineBuffer buf(level); |
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1061 buf.append("[%s :", str); |
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1062 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1063 double val = data[i]; |
1064 if (val < min) | |
1065 min = val; | |
1066 if (val > max) | |
1067 max = val; | |
1068 total += val; | |
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1069 buf.append(" %d", (int) val); |
342 | 1070 } |
2430 | 1071 buf.append_and_print_cr(""); |
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1072 double avg = total / (double) no_of_gc_threads(); |
2430 | 1073 buf.append_and_print_cr(" Sum: %d, Avg: %d, Min: %d, Max: %d, Diff: %d]", |
1074 (int)total, (int)avg, (int)min, (int)max, (int)max - (int)min); | |
342 | 1075 } |
1076 | |
4023 | 1077 void G1CollectorPolicy::print_stats(int level, |
1078 const char* str, | |
1079 double value) { | |
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1080 LineBuffer(level).append_and_print_cr("[%s: %5.1lf ms]", str, value); |
342 | 1081 } |
1082 | |
4023 | 1083 void G1CollectorPolicy::print_stats(int level, |
1084 const char* str, | |
1085 int value) { | |
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1086 LineBuffer(level).append_and_print_cr("[%s: %d]", str, value); |
342 | 1087 } |
1088 | |
4023 | 1089 double G1CollectorPolicy::avg_value(double* data) { |
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1090 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1091 double ret = 0.0; |
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1092 for (uint i = 0; i < no_of_gc_threads(); ++i) { |
342 | 1093 ret += data[i]; |
4023 | 1094 } |
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1095 return ret / (double) no_of_gc_threads(); |
342 | 1096 } else { |
1097 return data[0]; | |
1098 } | |
1099 } | |
1100 | |
4023 | 1101 double G1CollectorPolicy::max_value(double* data) { |
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1102 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1103 double ret = data[0]; |
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1104 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
4023 | 1105 if (data[i] > ret) { |
342 | 1106 ret = data[i]; |
4023 | 1107 } |
1108 } | |
342 | 1109 return ret; |
1110 } else { | |
1111 return data[0]; | |
1112 } | |
1113 } | |
1114 | |
4023 | 1115 double G1CollectorPolicy::sum_of_values(double* data) { |
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1116 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 1117 double sum = 0.0; |
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1118 for (uint i = 0; i < no_of_gc_threads(); i++) { |
342 | 1119 sum += data[i]; |
4023 | 1120 } |
342 | 1121 return sum; |
1122 } else { | |
1123 return data[0]; | |
1124 } | |
1125 } | |
1126 | |
4023 | 1127 double G1CollectorPolicy::max_sum(double* data1, double* data2) { |
342 | 1128 double ret = data1[0] + data2[0]; |
1129 | |
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1130 if (G1CollectedHeap::use_parallel_gc_threads()) { |
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1131 for (uint i = 1; i < no_of_gc_threads(); ++i) { |
342 | 1132 double data = data1[i] + data2[i]; |
4023 | 1133 if (data > ret) { |
342 | 1134 ret = data; |
4023 | 1135 } |
342 | 1136 } |
1137 } | |
1138 return ret; | |
1139 } | |
1140 | |
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1141 bool G1CollectorPolicy::need_to_start_conc_mark(const char* source) { |
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1142 if (_g1->mark_in_progress()) { |
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1143 return false; |
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1144 } |
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1145 |
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1146 size_t marking_initiating_used_threshold = |
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1147 (_g1->capacity() / 100) * InitiatingHeapOccupancyPercent; |
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1148 size_t cur_used_bytes = _g1->non_young_capacity_bytes(); |
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1149 |
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1150 if (cur_used_bytes > marking_initiating_used_threshold) { |
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1151 if (gcs_are_young()) { |
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1152 ergo_verbose4(ErgoConcCycles, |
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1153 "request concurrent cycle initiation", |
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1154 ergo_format_reason("occupancy higher than threshold") |
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1155 ergo_format_byte("occupancy") |
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1156 ergo_format_byte_perc("threshold") |
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1157 ergo_format_str("source"), |
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1158 cur_used_bytes, |
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1159 marking_initiating_used_threshold, |
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1160 (double) InitiatingHeapOccupancyPercent, |
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1161 source); |
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1162 return true; |
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1163 } else { |
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1164 ergo_verbose4(ErgoConcCycles, |
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1165 "do not request concurrent cycle initiation", |
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1166 ergo_format_reason("still doing mixed collections") |
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1167 ergo_format_byte("occupancy") |
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1168 ergo_format_byte_perc("threshold") |
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1169 ergo_format_str("source"), |
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1170 cur_used_bytes, |
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1171 marking_initiating_used_threshold, |
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1172 (double) InitiatingHeapOccupancyPercent, |
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1173 source); |
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1174 } |
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1175 } |
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1176 |
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1177 return false; |
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1178 } |
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1179 |
342 | 1180 // Anything below that is considered to be zero |
1181 #define MIN_TIMER_GRANULARITY 0.0000001 | |
1182 | |
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1183 void G1CollectorPolicy::record_collection_pause_end(int no_of_gc_threads) { |
342 | 1184 double end_time_sec = os::elapsedTime(); |
1185 double elapsed_ms = _last_pause_time_ms; | |
1833
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1186 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
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1187 assert(_cur_collection_pause_used_regions_at_start >= cset_region_length(), |
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1188 "otherwise, the subtraction below does not make sense"); |
342 | 1189 size_t rs_size = |
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1190 _cur_collection_pause_used_regions_at_start - cset_region_length(); |
342 | 1191 size_t cur_used_bytes = _g1->used(); |
1192 assert(cur_used_bytes == _g1->recalculate_used(), "It should!"); | |
1193 bool last_pause_included_initial_mark = false; | |
1707 | 1194 bool update_stats = !_g1->evacuation_failed(); |
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1195 set_no_of_gc_threads(no_of_gc_threads); |
342 | 1196 |
1197 #ifndef PRODUCT | |
1198 if (G1YoungSurvRateVerbose) { | |
1199 gclog_or_tty->print_cr(""); | |
1200 _short_lived_surv_rate_group->print(); | |
1201 // do that for any other surv rate groups too | |
1202 } | |
1203 #endif // PRODUCT | |
1204 | |
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1205 last_pause_included_initial_mark = during_initial_mark_pause(); |
4829
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1206 if (last_pause_included_initial_mark) { |
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1207 record_concurrent_mark_init_end(0.0); |
342 | 1208 } |
1209 | |
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1210 if (!_last_young_gc && need_to_start_conc_mark("end of GC")) { |
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1211 // Note: this might have already been set, if during the last |
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1212 // pause we decided to start a cycle but at the beginning of |
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1213 // this pause we decided to postpone it. That's OK. |
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1214 set_initiate_conc_mark_if_possible(); |
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1215 } |
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1216 |
342 | 1217 _mmu_tracker->add_pause(end_time_sec - elapsed_ms/1000.0, |
1218 end_time_sec, false); | |
1219 | |
1220 // This assert is exempted when we're doing parallel collection pauses, | |
1221 // because the fragmentation caused by the parallel GC allocation buffers | |
1222 // can lead to more memory being used during collection than was used | |
1223 // before. Best leave this out until the fragmentation problem is fixed. | |
1224 // Pauses in which evacuation failed can also lead to negative | |
1225 // collections, since no space is reclaimed from a region containing an | |
1226 // object whose evacuation failed. | |
1227 // Further, we're now always doing parallel collection. But I'm still | |
1228 // leaving this here as a placeholder for a more precise assertion later. | |
1229 // (DLD, 10/05.) | |
1230 assert((true || parallel) // Always using GC LABs now. | |
1231 || _g1->evacuation_failed() | |
1232 || _cur_collection_pause_used_at_start_bytes >= cur_used_bytes, | |
1233 "Negative collection"); | |
1234 | |
1235 size_t freed_bytes = | |
1236 _cur_collection_pause_used_at_start_bytes - cur_used_bytes; | |
1237 size_t surviving_bytes = _collection_set_bytes_used_before - freed_bytes; | |
1394
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1238 |
342 | 1239 double survival_fraction = |
1240 (double)surviving_bytes/ | |
1241 (double)_collection_set_bytes_used_before; | |
1242 | |
4023 | 1243 // These values are used to update the summary information that is |
1244 // displayed when TraceGen0Time is enabled, and are output as part | |
1245 // of the PrintGCDetails output, in the non-parallel case. | |
1246 | |
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1247 double ext_root_scan_time = avg_value(_par_last_ext_root_scan_times_ms); |
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1248 double satb_filtering_time = avg_value(_par_last_satb_filtering_times_ms); |
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1249 double update_rs_time = avg_value(_par_last_update_rs_times_ms); |
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1250 double update_rs_processed_buffers = |
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1251 sum_of_values(_par_last_update_rs_processed_buffers); |
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1252 double scan_rs_time = avg_value(_par_last_scan_rs_times_ms); |
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1253 double obj_copy_time = avg_value(_par_last_obj_copy_times_ms); |
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1254 double termination_time = avg_value(_par_last_termination_times_ms); |
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1255 |
4023 | 1256 double known_time = ext_root_scan_time + |
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1257 satb_filtering_time + |
4023 | 1258 update_rs_time + |
1259 scan_rs_time + | |
1260 obj_copy_time; | |
1261 | |
1262 double other_time_ms = elapsed_ms; | |
1263 | |
1264 // Subtract the SATB drain time. It's initialized to zero at the | |
1265 // start of the pause and is updated during the pause if marking | |
1266 // is in progress. | |
1267 other_time_ms -= _cur_satb_drain_time_ms; | |
1268 | |
1269 if (parallel) { | |
1270 other_time_ms -= _cur_collection_par_time_ms; | |
1271 } else { | |
1272 other_time_ms -= known_time; | |
1273 } | |
1274 | |
1275 // Subtract the time taken to clean the card table from the | |
1276 // current value of "other time" | |
1277 other_time_ms -= _cur_clear_ct_time_ms; | |
1278 | |
4097
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1279 // Subtract the time spent completing marking in the collection |
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1280 // set. Note if marking is not in progress during the pause |
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1281 // the value of _mark_closure_time_ms will be zero. |
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1282 other_time_ms -= _mark_closure_time_ms; |
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1283 |
4023 | 1284 // TraceGen0Time and TraceGen1Time summary info updating. |
1285 _all_pause_times_ms->add(elapsed_ms); | |
3823
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1286 |
595
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1287 if (update_stats) { |
4023 | 1288 _summary->record_total_time_ms(elapsed_ms); |
1289 _summary->record_other_time_ms(other_time_ms); | |
1290 | |
1291 MainBodySummary* body_summary = _summary->main_body_summary(); | |
1292 assert(body_summary != NULL, "should not be null!"); | |
1293 | |
1294 // This will be non-zero iff marking is currently in progress (i.e. | |
1295 // _g1->mark_in_progress() == true) and the currrent pause was not | |
1296 // an initial mark pause. Since the body_summary items are NumberSeqs, | |
1297 // however, they have to be consistent and updated in lock-step with | |
1298 // each other. Therefore we unconditionally record the SATB drain | |
1299 // time - even if it's zero. | |
1300 body_summary->record_satb_drain_time_ms(_cur_satb_drain_time_ms); | |
3823
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1301 |
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1302 body_summary->record_ext_root_scan_time_ms(ext_root_scan_time); |
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1303 body_summary->record_satb_filtering_time_ms(satb_filtering_time); |
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1304 body_summary->record_update_rs_time_ms(update_rs_time); |
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1305 body_summary->record_scan_rs_time_ms(scan_rs_time); |
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1306 body_summary->record_obj_copy_time_ms(obj_copy_time); |
4023 | 1307 |
3823
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1308 if (parallel) { |
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1309 body_summary->record_parallel_time_ms(_cur_collection_par_time_ms); |
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1310 body_summary->record_termination_time_ms(termination_time); |
4023 | 1311 |
1312 double parallel_known_time = known_time + termination_time; | |
1313 double parallel_other_time = _cur_collection_par_time_ms - parallel_known_time; | |
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1314 body_summary->record_parallel_other_time_ms(parallel_other_time); |
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1315 } |
4023 | 1316 |
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1317 body_summary->record_mark_closure_time_ms(_mark_closure_time_ms); |
4023 | 1318 body_summary->record_clear_ct_time_ms(_cur_clear_ct_time_ms); |
3823
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1319 |
342 | 1320 // We exempt parallel collection from this check because Alloc Buffer |
1321 // fragmentation can produce negative collections. Same with evac | |
1322 // failure. | |
1323 // Further, we're now always doing parallel collection. But I'm still | |
1324 // leaving this here as a placeholder for a more precise assertion later. | |
1325 // (DLD, 10/05. | |
1326 assert((true || parallel) | |
1327 || _g1->evacuation_failed() | |
1328 || surviving_bytes <= _collection_set_bytes_used_before, | |
1329 "Or else negative collection!"); | |
4023 | 1330 |
342 | 1331 // this is where we update the allocation rate of the application |
1332 double app_time_ms = | |
1333 (_cur_collection_start_sec * 1000.0 - _prev_collection_pause_end_ms); | |
1334 if (app_time_ms < MIN_TIMER_GRANULARITY) { | |
1335 // This usually happens due to the timer not having the required | |
1336 // granularity. Some Linuxes are the usual culprits. | |
1337 // We'll just set it to something (arbitrarily) small. | |
1338 app_time_ms = 1.0; | |
1339 } | |
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1340 // We maintain the invariant that all objects allocated by mutator |
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1341 // threads will be allocated out of eden regions. So, we can use |
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1342 // the eden region number allocated since the previous GC to |
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1343 // calculate the application's allocate rate. The only exception |
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1344 // to that is humongous objects that are allocated separately. But |
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1345 // given that humongous object allocations do not really affect |
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1346 // either the pause's duration nor when the next pause will take |
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1347 // place we can safely ignore them here. |
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1348 size_t regions_allocated = eden_cset_region_length(); |
342 | 1349 double alloc_rate_ms = (double) regions_allocated / app_time_ms; |
1350 _alloc_rate_ms_seq->add(alloc_rate_ms); | |
1351 | |
1352 double interval_ms = | |
1353 (end_time_sec - _recent_prev_end_times_for_all_gcs_sec->oldest()) * 1000.0; | |
1354 update_recent_gc_times(end_time_sec, elapsed_ms); | |
1355 _recent_avg_pause_time_ratio = _recent_gc_times_ms->sum()/interval_ms; | |
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1356 if (recent_avg_pause_time_ratio() < 0.0 || |
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1357 (recent_avg_pause_time_ratio() - 1.0 > 0.0)) { |
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1358 #ifndef PRODUCT |
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1359 // Dump info to allow post-facto debugging |
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1360 gclog_or_tty->print_cr("recent_avg_pause_time_ratio() out of bounds"); |
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1361 gclog_or_tty->print_cr("-------------------------------------------"); |
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1362 gclog_or_tty->print_cr("Recent GC Times (ms):"); |
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1363 _recent_gc_times_ms->dump(); |
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1364 gclog_or_tty->print_cr("(End Time=%3.3f) Recent GC End Times (s):", end_time_sec); |
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1365 _recent_prev_end_times_for_all_gcs_sec->dump(); |
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1366 gclog_or_tty->print_cr("GC = %3.3f, Interval = %3.3f, Ratio = %3.3f", |
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1367 _recent_gc_times_ms->sum(), interval_ms, recent_avg_pause_time_ratio()); |
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1368 // In debug mode, terminate the JVM if the user wants to debug at this point. |
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1369 assert(!G1FailOnFPError, "Debugging data for CR 6898948 has been dumped above"); |
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1370 #endif // !PRODUCT |
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1371 // Clip ratio between 0.0 and 1.0, and continue. This will be fixed in |
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1372 // CR 6902692 by redoing the manner in which the ratio is incrementally computed. |
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1373 if (_recent_avg_pause_time_ratio < 0.0) { |
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1374 _recent_avg_pause_time_ratio = 0.0; |
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1375 } else { |
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1376 assert(_recent_avg_pause_time_ratio - 1.0 > 0.0, "Ctl-point invariant"); |
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1377 _recent_avg_pause_time_ratio = 1.0; |
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1378 } |
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1379 } |
342 | 1380 } |
1381 | |
4023 | 1382 for (int i = 0; i < _aux_num; ++i) { |
1383 if (_cur_aux_times_set[i]) { | |
1384 _all_aux_times_ms[i].add(_cur_aux_times_ms[i]); | |
1385 } | |
1386 } | |
1387 | |
1388 // PrintGCDetails output | |
342 | 1389 if (PrintGCDetails) { |
4023 | 1390 bool print_marking_info = |
1391 _g1->mark_in_progress() && !last_pause_included_initial_mark; | |
1392 | |
1707 | 1393 gclog_or_tty->print_cr("%s, %1.8lf secs]", |
342 | 1394 (last_pause_included_initial_mark) ? " (initial-mark)" : "", |
1395 elapsed_ms / 1000.0); | |
1396 | |
1707 | 1397 if (parallel) { |
1398 print_stats(1, "Parallel Time", _cur_collection_par_time_ms); | |
4023 | 1399 print_par_stats(2, "GC Worker Start", _par_last_gc_worker_start_times_ms); |
1400 print_par_stats(2, "Ext Root Scanning", _par_last_ext_root_scan_times_ms); | |
1401 if (print_marking_info) { | |
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1402 print_par_stats(2, "SATB Filtering", _par_last_satb_filtering_times_ms); |
4023 | 1403 } |
1707 | 1404 print_par_stats(2, "Update RS", _par_last_update_rs_times_ms); |
2430 | 1405 print_par_sizes(3, "Processed Buffers", _par_last_update_rs_processed_buffers); |
1707 | 1406 print_par_stats(2, "Scan RS", _par_last_scan_rs_times_ms); |
1407 print_par_stats(2, "Object Copy", _par_last_obj_copy_times_ms); | |
1408 print_par_stats(2, "Termination", _par_last_termination_times_ms); | |
2430 | 1409 print_par_sizes(3, "Termination Attempts", _par_last_termination_attempts); |
4023 | 1410 print_par_stats(2, "GC Worker End", _par_last_gc_worker_end_times_ms); |
2430 | 1411 |
1412 for (int i = 0; i < _parallel_gc_threads; i++) { | |
1413 _par_last_gc_worker_times_ms[i] = _par_last_gc_worker_end_times_ms[i] - _par_last_gc_worker_start_times_ms[i]; | |
4023 | 1414 |
1415 double worker_known_time = _par_last_ext_root_scan_times_ms[i] + | |
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1416 _par_last_satb_filtering_times_ms[i] + |
4023 | 1417 _par_last_update_rs_times_ms[i] + |
1418 _par_last_scan_rs_times_ms[i] + | |
1419 _par_last_obj_copy_times_ms[i] + | |
1420 _par_last_termination_times_ms[i]; | |
1421 | |
1422 _par_last_gc_worker_other_times_ms[i] = _cur_collection_par_time_ms - worker_known_time; | |
2430 | 1423 } |
4023 | 1424 print_par_stats(2, "GC Worker", _par_last_gc_worker_times_ms); |
1425 print_par_stats(2, "GC Worker Other", _par_last_gc_worker_other_times_ms); | |
1707 | 1426 } else { |
4023 | 1427 print_stats(1, "Ext Root Scanning", ext_root_scan_time); |
1428 if (print_marking_info) { | |
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1429 print_stats(1, "SATB Filtering", satb_filtering_time); |
4023 | 1430 } |
1707 | 1431 print_stats(1, "Update RS", update_rs_time); |
4023 | 1432 print_stats(2, "Processed Buffers", (int)update_rs_processed_buffers); |
1707 | 1433 print_stats(1, "Scan RS", scan_rs_time); |
1434 print_stats(1, "Object Copying", obj_copy_time); | |
342 | 1435 } |
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1436 if (print_marking_info) { |
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1437 print_stats(1, "Complete CSet Marking", _mark_closure_time_ms); |
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1438 } |
4023 | 1439 print_stats(1, "Clear CT", _cur_clear_ct_time_ms); |
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1440 #ifndef PRODUCT |
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1441 print_stats(1, "Cur Clear CC", _cur_clear_cc_time_ms); |
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1442 print_stats(1, "Cum Clear CC", _cum_clear_cc_time_ms); |
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1443 print_stats(1, "Min Clear CC", _min_clear_cc_time_ms); |
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1444 print_stats(1, "Max Clear CC", _max_clear_cc_time_ms); |
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1445 if (_num_cc_clears > 0) { |
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1446 print_stats(1, "Avg Clear CC", _cum_clear_cc_time_ms / ((double)_num_cc_clears)); |
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1447 } |
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1448 #endif |
342 | 1449 print_stats(1, "Other", other_time_ms); |
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1450 print_stats(2, "Choose CSet", |
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1451 (_recorded_young_cset_choice_time_ms + |
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1452 _recorded_non_young_cset_choice_time_ms)); |
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1453 print_stats(2, "Ref Proc", _cur_ref_proc_time_ms); |
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1454 print_stats(2, "Ref Enq", _cur_ref_enq_time_ms); |
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1455 print_stats(2, "Free CSet", |
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1456 (_recorded_young_free_cset_time_ms + |
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1457 _recorded_non_young_free_cset_time_ms)); |
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1458 |
342 | 1459 for (int i = 0; i < _aux_num; ++i) { |
1460 if (_cur_aux_times_set[i]) { | |
1461 char buffer[96]; | |
1462 sprintf(buffer, "Aux%d", i); | |
1463 print_stats(1, buffer, _cur_aux_times_ms[i]); | |
1464 } | |
1465 } | |
1466 } | |
1467 | |
1468 // Update the efficiency-since-mark vars. | |
1469 double proc_ms = elapsed_ms * (double) _parallel_gc_threads; | |
1470 if (elapsed_ms < MIN_TIMER_GRANULARITY) { | |
1471 // This usually happens due to the timer not having the required | |
1472 // granularity. Some Linuxes are the usual culprits. | |
1473 // We'll just set it to something (arbitrarily) small. | |
1474 proc_ms = 1.0; | |
1475 } | |
1476 double cur_efficiency = (double) freed_bytes / proc_ms; | |
1477 | |
1478 bool new_in_marking_window = _in_marking_window; | |
1479 bool new_in_marking_window_im = false; | |
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1480 if (during_initial_mark_pause()) { |
342 | 1481 new_in_marking_window = true; |
1482 new_in_marking_window_im = true; | |
1483 } | |
1484 | |
4710 | 1485 if (_last_young_gc) { |
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1486 if (!last_pause_included_initial_mark) { |
4710 | 1487 ergo_verbose2(ErgoMixedGCs, |
1488 "start mixed GCs", | |
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1489 ergo_format_byte_perc("known garbage"), |
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1490 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
4710 | 1491 set_gcs_are_young(false); |
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1492 } else { |
4710 | 1493 ergo_verbose0(ErgoMixedGCs, |
1494 "do not start mixed GCs", | |
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1495 ergo_format_reason("concurrent cycle is about to start")); |
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1496 } |
4710 | 1497 _last_young_gc = false; |
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1498 } |
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1499 |
4710 | 1500 if (!_last_gc_was_young) { |
1501 if (_should_revert_to_young_gcs) { | |
1502 ergo_verbose2(ErgoMixedGCs, | |
1503 "end mixed GCs", | |
1504 ergo_format_reason("mixed GCs end requested") | |
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1505 ergo_format_byte_perc("known garbage"), |
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1506 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
4710 | 1507 set_gcs_are_young(true); |
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1508 } else if (_known_garbage_ratio < 0.05) { |
4710 | 1509 ergo_verbose3(ErgoMixedGCs, |
1510 "end mixed GCs", | |
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1511 ergo_format_reason("known garbage percent lower than threshold") |
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1512 ergo_format_byte_perc("known garbage") |
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1513 ergo_format_perc("threshold"), |
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1514 _known_garbage_bytes, _known_garbage_ratio * 100.0, |
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1515 0.05 * 100.0); |
4710 | 1516 set_gcs_are_young(true); |
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1517 } else if (adaptive_young_list_length() && |
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1518 (get_gc_eff_factor() * cur_efficiency < predict_young_gc_eff())) { |
4710 | 1519 ergo_verbose5(ErgoMixedGCs, |
1520 "end mixed GCs", | |
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1521 ergo_format_reason("current GC efficiency lower than " |
4710 | 1522 "predicted young GC efficiency") |
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1523 ergo_format_double("GC efficiency factor") |
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1524 ergo_format_double("current GC efficiency") |
4710 | 1525 ergo_format_double("predicted young GC efficiency") |
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1526 ergo_format_byte_perc("known garbage"), |
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1527 get_gc_eff_factor(), cur_efficiency, |
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1528 predict_young_gc_eff(), |
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1529 _known_garbage_bytes, _known_garbage_ratio * 100.0); |
4710 | 1530 set_gcs_are_young(true); |
342 | 1531 } |
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1532 } |
4710 | 1533 _should_revert_to_young_gcs = false; |
1534 | |
1535 if (_last_gc_was_young && !_during_marking) { | |
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1536 _young_gc_eff_seq->add(cur_efficiency); |
342 | 1537 } |
1538 | |
1539 _short_lived_surv_rate_group->start_adding_regions(); | |
1540 // do that for any other surv rate groupsx | |
1541 | |
677 | 1542 if (update_stats) { |
342 | 1543 double pause_time_ms = elapsed_ms; |
1544 | |
1545 size_t diff = 0; | |
1546 if (_max_pending_cards >= _pending_cards) | |
1547 diff = _max_pending_cards - _pending_cards; | |
1548 _pending_card_diff_seq->add((double) diff); | |
1549 | |
1550 double cost_per_card_ms = 0.0; | |
1551 if (_pending_cards > 0) { | |
1552 cost_per_card_ms = update_rs_time / (double) _pending_cards; | |
1553 _cost_per_card_ms_seq->add(cost_per_card_ms); | |
1554 } | |
1555 | |
1556 size_t cards_scanned = _g1->cards_scanned(); | |
1557 | |
1558 double cost_per_entry_ms = 0.0; | |
1559 if (cards_scanned > 10) { | |
1560 cost_per_entry_ms = scan_rs_time / (double) cards_scanned; | |
4710 | 1561 if (_last_gc_was_young) { |
342 | 1562 _cost_per_entry_ms_seq->add(cost_per_entry_ms); |
4710 | 1563 } else { |
1564 _mixed_cost_per_entry_ms_seq->add(cost_per_entry_ms); | |
1565 } | |
342 | 1566 } |
1567 | |
1568 if (_max_rs_lengths > 0) { | |
1569 double cards_per_entry_ratio = | |
1570 (double) cards_scanned / (double) _max_rs_lengths; | |
4710 | 1571 if (_last_gc_was_young) { |
1572 _young_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1573 } else { | |
1574 _mixed_cards_per_entry_ratio_seq->add(cards_per_entry_ratio); | |
1575 } | |
342 | 1576 } |
1577 | |
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1578 // This is defensive. For a while _max_rs_lengths could get |
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1579 // smaller than _recorded_rs_lengths which was causing |
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1580 // rs_length_diff to get very large and mess up the RSet length |
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1581 // predictions. The reason was unsafe concurrent updates to the |
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1582 // _inc_cset_recorded_rs_lengths field which the code below guards |
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1583 // against (see CR 7118202). This bug has now been fixed (see CR |
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1584 // 7119027). However, I'm still worried that |
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1585 // _inc_cset_recorded_rs_lengths might still end up somewhat |
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1586 // inaccurate. The concurrent refinement thread calculates an |
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1587 // RSet's length concurrently with other CR threads updating it |
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1588 // which might cause it to calculate the length incorrectly (if, |
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1589 // say, it's in mid-coarsening). So I'll leave in the defensive |
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1590 // conditional below just in case. |
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1591 size_t rs_length_diff = 0; |
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1592 if (_max_rs_lengths > _recorded_rs_lengths) { |
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1593 rs_length_diff = _max_rs_lengths - _recorded_rs_lengths; |
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1594 } |
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1595 _rs_length_diff_seq->add((double) rs_length_diff); |
342 | 1596 |
1597 size_t copied_bytes = surviving_bytes; | |
1598 double cost_per_byte_ms = 0.0; | |
1599 if (copied_bytes > 0) { | |
1600 cost_per_byte_ms = obj_copy_time / (double) copied_bytes; | |
4710 | 1601 if (_in_marking_window) { |
342 | 1602 _cost_per_byte_ms_during_cm_seq->add(cost_per_byte_ms); |
4710 | 1603 } else { |
342 | 1604 _cost_per_byte_ms_seq->add(cost_per_byte_ms); |
4710 | 1605 } |
342 | 1606 } |
1607 | |
1608 double all_other_time_ms = pause_time_ms - | |
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1609 (update_rs_time + scan_rs_time + obj_copy_time + |
342 | 1610 _mark_closure_time_ms + termination_time); |
1611 | |
1612 double young_other_time_ms = 0.0; | |
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1613 if (young_cset_region_length() > 0) { |
342 | 1614 young_other_time_ms = |
1615 _recorded_young_cset_choice_time_ms + | |
1616 _recorded_young_free_cset_time_ms; | |
1617 _young_other_cost_per_region_ms_seq->add(young_other_time_ms / | |
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1618 (double) young_cset_region_length()); |
342 | 1619 } |
1620 double non_young_other_time_ms = 0.0; | |
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1621 if (old_cset_region_length() > 0) { |
342 | 1622 non_young_other_time_ms = |
1623 _recorded_non_young_cset_choice_time_ms + | |
1624 _recorded_non_young_free_cset_time_ms; | |
1625 | |
1626 _non_young_other_cost_per_region_ms_seq->add(non_young_other_time_ms / | |
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1627 (double) old_cset_region_length()); |
342 | 1628 } |
1629 | |
1630 double constant_other_time_ms = all_other_time_ms - | |
1631 (young_other_time_ms + non_young_other_time_ms); | |
1632 _constant_other_time_ms_seq->add(constant_other_time_ms); | |
1633 | |
1634 double survival_ratio = 0.0; | |
1635 if (_bytes_in_collection_set_before_gc > 0) { | |
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1636 survival_ratio = (double) _bytes_copied_during_gc / |
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1637 (double) _bytes_in_collection_set_before_gc; |
342 | 1638 } |
1639 | |
1640 _pending_cards_seq->add((double) _pending_cards); | |
1641 _rs_lengths_seq->add((double) _max_rs_lengths); | |
1642 | |
1643 double expensive_region_limit_ms = | |
751 | 1644 (double) MaxGCPauseMillis - predict_constant_other_time_ms(); |
342 | 1645 if (expensive_region_limit_ms < 0.0) { |
1646 // this means that the other time was predicted to be longer than | |
1647 // than the max pause time | |
751 | 1648 expensive_region_limit_ms = (double) MaxGCPauseMillis; |
342 | 1649 } |
1650 _expensive_region_limit_ms = expensive_region_limit_ms; | |
1651 } | |
1652 | |
1653 _in_marking_window = new_in_marking_window; | |
1654 _in_marking_window_im = new_in_marking_window_im; | |
1655 _free_regions_at_end_of_collection = _g1->free_regions(); | |
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1656 update_young_list_target_length(); |
342 | 1657 |
1111 | 1658 // Note that _mmu_tracker->max_gc_time() returns the time in seconds. |
1282 | 1659 double update_rs_time_goal_ms = _mmu_tracker->max_gc_time() * MILLIUNITS * G1RSetUpdatingPauseTimePercent / 100.0; |
1111 | 1660 adjust_concurrent_refinement(update_rs_time, update_rs_processed_buffers, update_rs_time_goal_ms); |
4013 | 1661 |
1662 assert(assertMarkedBytesDataOK(), "Marked regions not OK at pause end."); | |
342 | 1663 } |
1664 | |
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1665 #define EXT_SIZE_FORMAT "%d%s" |
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1666 #define EXT_SIZE_PARAMS(bytes) \ |
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1667 byte_size_in_proper_unit((bytes)), \ |
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1668 proper_unit_for_byte_size((bytes)) |
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1669 |
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1670 void G1CollectorPolicy::print_heap_transition() { |
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1671 if (PrintGCDetails) { |
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1672 YoungList* young_list = _g1->young_list(); |
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1673 size_t eden_bytes = young_list->eden_used_bytes(); |
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1674 size_t survivor_bytes = young_list->survivor_used_bytes(); |
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1675 size_t used_before_gc = _cur_collection_pause_used_at_start_bytes; |
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1676 size_t used = _g1->used(); |
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1677 size_t capacity = _g1->capacity(); |
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1678 size_t eden_capacity = |
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1679 (_young_list_target_length * HeapRegion::GrainBytes) - survivor_bytes; |
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1680 |
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1681 gclog_or_tty->print_cr( |
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1682 " [Eden: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->"EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT") " |
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1683 "Survivors: "EXT_SIZE_FORMAT"->"EXT_SIZE_FORMAT" " |
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1684 "Heap: "EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")->" |
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1685 EXT_SIZE_FORMAT"("EXT_SIZE_FORMAT")]", |
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1686 EXT_SIZE_PARAMS(_eden_bytes_before_gc), |
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1687 EXT_SIZE_PARAMS(_prev_eden_capacity), |
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1688 EXT_SIZE_PARAMS(eden_bytes), |
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1689 EXT_SIZE_PARAMS(eden_capacity), |
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1690 EXT_SIZE_PARAMS(_survivor_bytes_before_gc), |
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1691 EXT_SIZE_PARAMS(survivor_bytes), |
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1692 EXT_SIZE_PARAMS(used_before_gc), |
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1693 EXT_SIZE_PARAMS(_capacity_before_gc), |
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1694 EXT_SIZE_PARAMS(used), |
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1695 EXT_SIZE_PARAMS(capacity)); |
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1696 |
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1697 _prev_eden_capacity = eden_capacity; |
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1698 } else if (PrintGC) { |
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1699 _g1->print_size_transition(gclog_or_tty, |
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1700 _cur_collection_pause_used_at_start_bytes, |
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1701 _g1->used(), _g1->capacity()); |
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1702 } |
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1703 } |
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1704 |
1111 | 1705 void G1CollectorPolicy::adjust_concurrent_refinement(double update_rs_time, |
1706 double update_rs_processed_buffers, | |
1707 double goal_ms) { | |
1708 DirtyCardQueueSet& dcqs = JavaThread::dirty_card_queue_set(); | |
1709 ConcurrentG1Refine *cg1r = G1CollectedHeap::heap()->concurrent_g1_refine(); | |
1710 | |
1282 | 1711 if (G1UseAdaptiveConcRefinement) { |
1111 | 1712 const int k_gy = 3, k_gr = 6; |
1713 const double inc_k = 1.1, dec_k = 0.9; | |
1714 | |
1715 int g = cg1r->green_zone(); | |
1716 if (update_rs_time > goal_ms) { | |
1717 g = (int)(g * dec_k); // Can become 0, that's OK. That would mean a mutator-only processing. | |
1718 } else { | |
1719 if (update_rs_time < goal_ms && update_rs_processed_buffers > g) { | |
1720 g = (int)MAX2(g * inc_k, g + 1.0); | |
1721 } | |
1722 } | |
1723 // Change the refinement threads params | |
1724 cg1r->set_green_zone(g); | |
1725 cg1r->set_yellow_zone(g * k_gy); | |
1726 cg1r->set_red_zone(g * k_gr); | |
1727 cg1r->reinitialize_threads(); | |
1728 | |
1729 int processing_threshold_delta = MAX2((int)(cg1r->green_zone() * sigma()), 1); | |
1730 int processing_threshold = MIN2(cg1r->green_zone() + processing_threshold_delta, | |
1731 cg1r->yellow_zone()); | |
1732 // Change the barrier params | |
1733 dcqs.set_process_completed_threshold(processing_threshold); | |
1734 dcqs.set_max_completed_queue(cg1r->red_zone()); | |
1735 } | |
1736 | |
1737 int curr_queue_size = dcqs.completed_buffers_num(); | |
1738 if (curr_queue_size >= cg1r->yellow_zone()) { | |
1739 dcqs.set_completed_queue_padding(curr_queue_size); | |
1740 } else { | |
1741 dcqs.set_completed_queue_padding(0); | |
1742 } | |
1743 dcqs.notify_if_necessary(); | |
1744 } | |
1745 | |
342 | 1746 double |
1747 G1CollectorPolicy:: | |
1748 predict_young_collection_elapsed_time_ms(size_t adjustment) { | |
1749 guarantee( adjustment == 0 || adjustment == 1, "invariant" ); | |
1750 | |
1751 G1CollectedHeap* g1h = G1CollectedHeap::heap(); | |
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1752 size_t young_num = g1h->young_list()->length(); |
342 | 1753 if (young_num == 0) |
1754 return 0.0; | |
1755 | |
1756 young_num += adjustment; | |
1757 size_t pending_cards = predict_pending_cards(); | |
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1758 size_t rs_lengths = g1h->young_list()->sampled_rs_lengths() + |
342 | 1759 predict_rs_length_diff(); |
1760 size_t card_num; | |
4710 | 1761 if (gcs_are_young()) { |
342 | 1762 card_num = predict_young_card_num(rs_lengths); |
4710 | 1763 } else { |
342 | 1764 card_num = predict_non_young_card_num(rs_lengths); |
4710 | 1765 } |
342 | 1766 size_t young_byte_size = young_num * HeapRegion::GrainBytes; |
1767 double accum_yg_surv_rate = | |
1768 _short_lived_surv_rate_group->accum_surv_rate(adjustment); | |
1769 | |
1770 size_t bytes_to_copy = | |
1771 (size_t) (accum_yg_surv_rate * (double) HeapRegion::GrainBytes); | |
1772 | |
1773 return | |
1774 predict_rs_update_time_ms(pending_cards) + | |
1775 predict_rs_scan_time_ms(card_num) + | |
1776 predict_object_copy_time_ms(bytes_to_copy) + | |
1777 predict_young_other_time_ms(young_num) + | |
1778 predict_constant_other_time_ms(); | |
1779 } | |
1780 | |
1781 double | |
1782 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards) { | |
1783 size_t rs_length = predict_rs_length_diff(); | |
1784 size_t card_num; | |
4710 | 1785 if (gcs_are_young()) { |
342 | 1786 card_num = predict_young_card_num(rs_length); |
4710 | 1787 } else { |
342 | 1788 card_num = predict_non_young_card_num(rs_length); |
4710 | 1789 } |
342 | 1790 return predict_base_elapsed_time_ms(pending_cards, card_num); |
1791 } | |
1792 | |
1793 double | |
1794 G1CollectorPolicy::predict_base_elapsed_time_ms(size_t pending_cards, | |
1795 size_t scanned_cards) { | |
1796 return | |
1797 predict_rs_update_time_ms(pending_cards) + | |
1798 predict_rs_scan_time_ms(scanned_cards) + | |
1799 predict_constant_other_time_ms(); | |
1800 } | |
1801 | |
1802 double | |
1803 G1CollectorPolicy::predict_region_elapsed_time_ms(HeapRegion* hr, | |
1804 bool young) { | |
1805 size_t rs_length = hr->rem_set()->occupied(); | |
1806 size_t card_num; | |
4710 | 1807 if (gcs_are_young()) { |
342 | 1808 card_num = predict_young_card_num(rs_length); |
4710 | 1809 } else { |
342 | 1810 card_num = predict_non_young_card_num(rs_length); |
4710 | 1811 } |
342 | 1812 size_t bytes_to_copy = predict_bytes_to_copy(hr); |
1813 | |
1814 double region_elapsed_time_ms = | |
1815 predict_rs_scan_time_ms(card_num) + | |
1816 predict_object_copy_time_ms(bytes_to_copy); | |
1817 | |
1818 if (young) | |
1819 region_elapsed_time_ms += predict_young_other_time_ms(1); | |
1820 else | |
1821 region_elapsed_time_ms += predict_non_young_other_time_ms(1); | |
1822 | |
1823 return region_elapsed_time_ms; | |
1824 } | |
1825 | |
1826 size_t | |
1827 G1CollectorPolicy::predict_bytes_to_copy(HeapRegion* hr) { | |
1828 size_t bytes_to_copy; | |
1829 if (hr->is_marked()) | |
1830 bytes_to_copy = hr->max_live_bytes(); | |
1831 else { | |
1832 guarantee( hr->is_young() && hr->age_in_surv_rate_group() != -1, | |
1833 "invariant" ); | |
1834 int age = hr->age_in_surv_rate_group(); | |
545 | 1835 double yg_surv_rate = predict_yg_surv_rate(age, hr->surv_rate_group()); |
342 | 1836 bytes_to_copy = (size_t) ((double) hr->used() * yg_surv_rate); |
1837 } | |
1838 | |
1839 return bytes_to_copy; | |
1840 } | |
1841 | |
1842 void | |
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1843 G1CollectorPolicy::init_cset_region_lengths(size_t eden_cset_region_length, |
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1844 size_t survivor_cset_region_length) { |
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1845 _eden_cset_region_length = eden_cset_region_length; |
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1846 _survivor_cset_region_length = survivor_cset_region_length; |
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1847 _old_cset_region_length = 0; |
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1848 } |
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1849 |
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1850 void G1CollectorPolicy::set_recorded_rs_lengths(size_t rs_lengths) { |
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1851 _recorded_rs_lengths = rs_lengths; |
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1852 } |
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1853 |
342 | 1854 void G1CollectorPolicy::check_if_region_is_too_expensive(double |
1855 predicted_time_ms) { | |
1856 // I don't think we need to do this when in young GC mode since | |
1857 // marking will be initiated next time we hit the soft limit anyway... | |
1858 if (predicted_time_ms > _expensive_region_limit_ms) { | |
4710 | 1859 ergo_verbose2(ErgoMixedGCs, |
1860 "request mixed GCs end", | |
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1861 ergo_format_reason("predicted region time higher than threshold") |
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1862 ergo_format_ms("predicted region time") |
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1863 ergo_format_ms("threshold"), |
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1864 predicted_time_ms, _expensive_region_limit_ms); |
4710 | 1865 // no point in doing another mixed GC |
1866 _should_revert_to_young_gcs = true; | |
342 | 1867 } |
1868 } | |
1869 | |
1870 void G1CollectorPolicy::update_recent_gc_times(double end_time_sec, | |
1871 double elapsed_ms) { | |
1872 _recent_gc_times_ms->add(elapsed_ms); | |
1873 _recent_prev_end_times_for_all_gcs_sec->add(end_time_sec); | |
1874 _prev_collection_pause_end_ms = end_time_sec * 1000.0; | |
1875 } | |
1876 | |
1877 size_t G1CollectorPolicy::expansion_amount() { | |
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1878 double recent_gc_overhead = recent_avg_pause_time_ratio() * 100.0; |
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1879 double threshold = _gc_overhead_perc; |
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1880 if (recent_gc_overhead > threshold) { |
751 | 1881 // We will double the existing space, or take |
1882 // G1ExpandByPercentOfAvailable % of the available expansion | |
1883 // space, whichever is smaller, bounded below by a minimum | |
1884 // expansion (unless that's all that's left.) | |
342 | 1885 const size_t min_expand_bytes = 1*M; |
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1886 size_t reserved_bytes = _g1->max_capacity(); |
342 | 1887 size_t committed_bytes = _g1->capacity(); |
1888 size_t uncommitted_bytes = reserved_bytes - committed_bytes; | |
1889 size_t expand_bytes; | |
1890 size_t expand_bytes_via_pct = | |
751 | 1891 uncommitted_bytes * G1ExpandByPercentOfAvailable / 100; |
342 | 1892 expand_bytes = MIN2(expand_bytes_via_pct, committed_bytes); |
1893 expand_bytes = MAX2(expand_bytes, min_expand_bytes); | |
1894 expand_bytes = MIN2(expand_bytes, uncommitted_bytes); | |
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1895 |
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1896 ergo_verbose5(ErgoHeapSizing, |
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1897 "attempt heap expansion", |
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1898 ergo_format_reason("recent GC overhead higher than " |
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1899 "threshold after GC") |
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1900 ergo_format_perc("recent GC overhead") |
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1901 ergo_format_perc("threshold") |
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1902 ergo_format_byte("uncommitted") |
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1903 ergo_format_byte_perc("calculated expansion amount"), |
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1904 recent_gc_overhead, threshold, |
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1905 uncommitted_bytes, |
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1906 expand_bytes_via_pct, (double) G1ExpandByPercentOfAvailable); |
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1907 |
342 | 1908 return expand_bytes; |
1909 } else { | |
1910 return 0; | |
1911 } | |
1912 } | |
1913 | |
1914 class CountCSClosure: public HeapRegionClosure { | |
1915 G1CollectorPolicy* _g1_policy; | |
1916 public: | |
1917 CountCSClosure(G1CollectorPolicy* g1_policy) : | |
1918 _g1_policy(g1_policy) {} | |
1919 bool doHeapRegion(HeapRegion* r) { | |
1920 _g1_policy->_bytes_in_collection_set_before_gc += r->used(); | |
1921 return false; | |
1922 } | |
1923 }; | |
1924 | |
1925 void G1CollectorPolicy::count_CS_bytes_used() { | |
1926 CountCSClosure cs_closure(this); | |
1927 _g1->collection_set_iterate(&cs_closure); | |
1928 } | |
1929 | |
4023 | 1930 void G1CollectorPolicy::print_summary(int level, |
1931 const char* str, | |
1932 NumberSeq* seq) const { | |
342 | 1933 double sum = seq->sum(); |
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1934 LineBuffer(level + 1).append_and_print_cr("%-24s = %8.2lf s (avg = %8.2lf ms)", |
342 | 1935 str, sum / 1000.0, seq->avg()); |
1936 } | |
1937 | |
4023 | 1938 void G1CollectorPolicy::print_summary_sd(int level, |
1939 const char* str, | |
1940 NumberSeq* seq) const { | |
342 | 1941 print_summary(level, str, seq); |
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1942 LineBuffer(level + 6).append_and_print_cr("(num = %5d, std dev = %8.2lf ms, max = %8.2lf ms)", |
342 | 1943 seq->num(), seq->sd(), seq->maximum()); |
1944 } | |
1945 | |
1946 void G1CollectorPolicy::check_other_times(int level, | |
1947 NumberSeq* other_times_ms, | |
1948 NumberSeq* calc_other_times_ms) const { | |
1949 bool should_print = false; | |
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1950 LineBuffer buf(level + 2); |
342 | 1951 |
1952 double max_sum = MAX2(fabs(other_times_ms->sum()), | |
1953 fabs(calc_other_times_ms->sum())); | |
1954 double min_sum = MIN2(fabs(other_times_ms->sum()), | |
1955 fabs(calc_other_times_ms->sum())); | |
1956 double sum_ratio = max_sum / min_sum; | |
1957 if (sum_ratio > 1.1) { | |
1958 should_print = true; | |
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1959 buf.append_and_print_cr("## CALCULATED OTHER SUM DOESN'T MATCH RECORDED ###"); |
342 | 1960 } |
1961 | |
1962 double max_avg = MAX2(fabs(other_times_ms->avg()), | |
1963 fabs(calc_other_times_ms->avg())); | |
1964 double min_avg = MIN2(fabs(other_times_ms->avg()), | |
1965 fabs(calc_other_times_ms->avg())); | |
1966 double avg_ratio = max_avg / min_avg; | |
1967 if (avg_ratio > 1.1) { | |
1968 should_print = true; | |
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1969 buf.append_and_print_cr("## CALCULATED OTHER AVG DOESN'T MATCH RECORDED ###"); |
342 | 1970 } |
1971 | |
1972 if (other_times_ms->sum() < -0.01) { | |
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1973 buf.append_and_print_cr("## RECORDED OTHER SUM IS NEGATIVE ###"); |
342 | 1974 } |
1975 | |
1976 if (other_times_ms->avg() < -0.01) { | |
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1977 buf.append_and_print_cr("## RECORDED OTHER AVG IS NEGATIVE ###"); |
342 | 1978 } |
1979 | |
1980 if (calc_other_times_ms->sum() < -0.01) { | |
1981 should_print = true; | |
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1982 buf.append_and_print_cr("## CALCULATED OTHER SUM IS NEGATIVE ###"); |
342 | 1983 } |
1984 | |
1985 if (calc_other_times_ms->avg() < -0.01) { | |
1986 should_print = true; | |
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1987 buf.append_and_print_cr("## CALCULATED OTHER AVG IS NEGATIVE ###"); |
342 | 1988 } |
1989 | |
1990 if (should_print) | |
1991 print_summary(level, "Other(Calc)", calc_other_times_ms); | |
1992 } | |
1993 | |
1994 void G1CollectorPolicy::print_summary(PauseSummary* summary) const { | |
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1995 bool parallel = G1CollectedHeap::use_parallel_gc_threads(); |
342 | 1996 MainBodySummary* body_summary = summary->main_body_summary(); |
1997 if (summary->get_total_seq()->num() > 0) { | |
677 | 1998 print_summary_sd(0, "Evacuation Pauses", summary->get_total_seq()); |
342 | 1999 if (body_summary != NULL) { |
2000 if (parallel) { | |
2001 print_summary(1, "Parallel Time", body_summary->get_parallel_seq()); | |
4023 | 2002 print_summary(2, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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2003 print_summary(2, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 2004 print_summary(2, "Update RS", body_summary->get_update_rs_seq()); |
2005 print_summary(2, "Scan RS", body_summary->get_scan_rs_seq()); | |
2006 print_summary(2, "Object Copy", body_summary->get_obj_copy_seq()); | |
2007 print_summary(2, "Termination", body_summary->get_termination_seq()); | |
4023 | 2008 print_summary(2, "Parallel Other", body_summary->get_parallel_other_seq()); |
342 | 2009 { |
2010 NumberSeq* other_parts[] = { | |
2011 body_summary->get_ext_root_scan_seq(), | |
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2012 body_summary->get_satb_filtering_seq(), |
4023 | 2013 body_summary->get_update_rs_seq(), |
342 | 2014 body_summary->get_scan_rs_seq(), |
2015 body_summary->get_obj_copy_seq(), | |
2016 body_summary->get_termination_seq() | |
2017 }; | |
2018 NumberSeq calc_other_times_ms(body_summary->get_parallel_seq(), | |
1779 | 2019 6, other_parts); |
342 | 2020 check_other_times(2, body_summary->get_parallel_other_seq(), |
2021 &calc_other_times_ms); | |
2022 } | |
2023 } else { | |
4023 | 2024 print_summary(1, "Ext Root Scanning", body_summary->get_ext_root_scan_seq()); |
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2025 print_summary(1, "SATB Filtering", body_summary->get_satb_filtering_seq()); |
342 | 2026 print_summary(1, "Update RS", body_summary->get_update_rs_seq()); |
2027 print_summary(1, "Scan RS", body_summary->get_scan_rs_seq()); | |
2028 print_summary(1, "Object Copy", body_summary->get_obj_copy_seq()); | |
2029 } | |
2030 } | |
4023 | 2031 print_summary(1, "Mark Closure", body_summary->get_mark_closure_seq()); |
2032 print_summary(1, "Clear CT", body_summary->get_clear_ct_seq()); | |
342 | 2033 print_summary(1, "Other", summary->get_other_seq()); |
2034 { | |
1779 | 2035 if (body_summary != NULL) { |
2036 NumberSeq calc_other_times_ms; | |
2037 if (parallel) { | |
2038 // parallel | |
2039 NumberSeq* other_parts[] = { | |
2040 body_summary->get_satb_drain_seq(), | |
2041 body_summary->get_parallel_seq(), | |
2042 body_summary->get_clear_ct_seq() | |
2043 }; | |
2044 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2045 3, other_parts); | |
2046 } else { | |
2047 // serial | |
2048 NumberSeq* other_parts[] = { | |
2049 body_summary->get_satb_drain_seq(), | |
2050 body_summary->get_update_rs_seq(), | |
2051 body_summary->get_ext_root_scan_seq(), | |
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2052 body_summary->get_satb_filtering_seq(), |
1779 | 2053 body_summary->get_scan_rs_seq(), |
2054 body_summary->get_obj_copy_seq() | |
2055 }; | |
2056 calc_other_times_ms = NumberSeq(summary->get_total_seq(), | |
2057 6, other_parts); | |
2058 } | |
2059 check_other_times(1, summary->get_other_seq(), &calc_other_times_ms); | |
342 | 2060 } |
2061 } | |
2062 } else { | |
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2063 LineBuffer(1).append_and_print_cr("none"); |
342 | 2064 } |
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2065 LineBuffer(0).append_and_print_cr(""); |
342 | 2066 } |
2067 | |
2068 void G1CollectorPolicy::print_tracing_info() const { | |
2069 if (TraceGen0Time) { | |
2070 gclog_or_tty->print_cr("ALL PAUSES"); | |
2071 print_summary_sd(0, "Total", _all_pause_times_ms); | |
2072 gclog_or_tty->print_cr(""); | |
2073 gclog_or_tty->print_cr(""); | |
4710 | 2074 gclog_or_tty->print_cr(" Young GC Pauses: %8d", _young_pause_num); |
2075 gclog_or_tty->print_cr(" Mixed GC Pauses: %8d", _mixed_pause_num); | |
342 | 2076 gclog_or_tty->print_cr(""); |
2077 | |
677 | 2078 gclog_or_tty->print_cr("EVACUATION PAUSES"); |
2079 print_summary(_summary); | |
342 | 2080 |
2081 gclog_or_tty->print_cr("MISC"); | |
2082 print_summary_sd(0, "Stop World", _all_stop_world_times_ms); | |
2083 print_summary_sd(0, "Yields", _all_yield_times_ms); | |
2084 for (int i = 0; i < _aux_num; ++i) { | |
2085 if (_all_aux_times_ms[i].num() > 0) { | |
2086 char buffer[96]; | |
2087 sprintf(buffer, "Aux%d", i); | |
2088 print_summary_sd(0, buffer, &_all_aux_times_ms[i]); | |
2089 } | |
2090 } | |
2091 } | |
2092 if (TraceGen1Time) { | |
2093 if (_all_full_gc_times_ms->num() > 0) { | |
2094 gclog_or_tty->print("\n%4d full_gcs: total time = %8.2f s", | |
2095 _all_full_gc_times_ms->num(), | |
2096 _all_full_gc_times_ms->sum() / 1000.0); | |
2097 gclog_or_tty->print_cr(" (avg = %8.2fms).", _all_full_gc_times_ms->avg()); | |
2098 gclog_or_tty->print_cr(" [std. dev = %8.2f ms, max = %8.2f ms]", | |
2099 _all_full_gc_times_ms->sd(), | |
2100 _all_full_gc_times_ms->maximum()); | |
2101 } | |
2102 } | |
2103 } | |
2104 | |
2105 void G1CollectorPolicy::print_yg_surv_rate_info() const { | |
2106 #ifndef PRODUCT | |
2107 _short_lived_surv_rate_group->print_surv_rate_summary(); | |
2108 // add this call for any other surv rate groups | |
2109 #endif // PRODUCT | |
2110 } | |
2111 | |
2112 #ifndef PRODUCT | |
2113 // for debugging, bit of a hack... | |
2114 static char* | |
2115 region_num_to_mbs(int length) { | |
2116 static char buffer[64]; | |
2117 double bytes = (double) (length * HeapRegion::GrainBytes); | |
2118 double mbs = bytes / (double) (1024 * 1024); | |
2119 sprintf(buffer, "%7.2lfMB", mbs); | |
2120 return buffer; | |
2121 } | |
2122 #endif // PRODUCT | |
2123 | |
545 | 2124 size_t G1CollectorPolicy::max_regions(int purpose) { |
342 | 2125 switch (purpose) { |
2126 case GCAllocForSurvived: | |
545 | 2127 return _max_survivor_regions; |
342 | 2128 case GCAllocForTenured: |
545 | 2129 return REGIONS_UNLIMITED; |
342 | 2130 default: |
545 | 2131 ShouldNotReachHere(); |
2132 return REGIONS_UNLIMITED; | |
342 | 2133 }; |
2134 } | |
2135 | |
3919
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2136 void G1CollectorPolicy::update_max_gc_locker_expansion() { |
1991
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2137 size_t expansion_region_num = 0; |
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2138 if (GCLockerEdenExpansionPercent > 0) { |
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2139 double perc = (double) GCLockerEdenExpansionPercent / 100.0; |
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2140 double expansion_region_num_d = perc * (double) _young_list_target_length; |
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2141 // We use ceiling so that if expansion_region_num_d is > 0.0 (but |
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2142 // less than 1.0) we'll get 1. |
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2143 expansion_region_num = (size_t) ceil(expansion_region_num_d); |
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2144 } else { |
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2145 assert(expansion_region_num == 0, "sanity"); |
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2146 } |
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2147 _young_list_max_length = _young_list_target_length + expansion_region_num; |
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2148 assert(_young_list_target_length <= _young_list_max_length, "post-condition"); |
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2149 } |
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2150 |
545 | 2151 // Calculates survivor space parameters. |
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2152 void G1CollectorPolicy::update_survivors_policy() { |
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2153 double max_survivor_regions_d = |
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2154 (double) _young_list_target_length / (double) SurvivorRatio; |
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2155 // We use ceiling so that if max_survivor_regions_d is > 0.0 (but |
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2156 // smaller than 1.0) we'll get 1. |
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2157 _max_survivor_regions = (size_t) ceil(max_survivor_regions_d); |
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2158 |
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2159 _tenuring_threshold = _survivors_age_table.compute_tenuring_threshold( |
545 | 2160 HeapRegion::GrainWords * _max_survivor_regions); |
2161 } | |
2162 | |
342 | 2163 #ifndef PRODUCT |
2164 class HRSortIndexIsOKClosure: public HeapRegionClosure { | |
2165 CollectionSetChooser* _chooser; | |
2166 public: | |
2167 HRSortIndexIsOKClosure(CollectionSetChooser* chooser) : | |
2168 _chooser(chooser) {} | |
2169 | |
2170 bool doHeapRegion(HeapRegion* r) { | |
2171 if (!r->continuesHumongous()) { | |
2172 assert(_chooser->regionProperlyOrdered(r), "Ought to be."); | |
2173 } | |
2174 return false; | |
2175 } | |
2176 }; | |
2177 | |
4013 | 2178 bool G1CollectorPolicy::assertMarkedBytesDataOK() { |
342 | 2179 HRSortIndexIsOKClosure cl(_collectionSetChooser); |
2180 _g1->heap_region_iterate(&cl); | |
2181 return true; | |
2182 } | |
2183 #endif | |
2184 | |
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2185 bool G1CollectorPolicy::force_initial_mark_if_outside_cycle( |
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2186 GCCause::Cause gc_cause) { |
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2187 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2188 if (!during_cycle) { |
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2189 ergo_verbose1(ErgoConcCycles, |
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2190 "request concurrent cycle initiation", |
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2191 ergo_format_reason("requested by GC cause") |
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2192 ergo_format_str("GC cause"), |
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2193 GCCause::to_string(gc_cause)); |
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2194 set_initiate_conc_mark_if_possible(); |
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2195 return true; |
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2196 } else { |
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2197 ergo_verbose1(ErgoConcCycles, |
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2198 "do not request concurrent cycle initiation", |
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2199 ergo_format_reason("concurrent cycle already in progress") |
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2200 ergo_format_str("GC cause"), |
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2201 GCCause::to_string(gc_cause)); |
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2202 return false; |
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|
2203 } |
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|
2204 } |
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2205 |
342 | 2206 void |
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2207 G1CollectorPolicy::decide_on_conc_mark_initiation() { |
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2208 // We are about to decide on whether this pause will be an |
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2209 // initial-mark pause. |
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2210 |
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2211 // First, during_initial_mark_pause() should not be already set. We |
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2212 // will set it here if we have to. However, it should be cleared by |
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2213 // the end of the pause (it's only set for the duration of an |
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2214 // initial-mark pause). |
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2215 assert(!during_initial_mark_pause(), "pre-condition"); |
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2216 |
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2217 if (initiate_conc_mark_if_possible()) { |
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2218 // We had noticed on a previous pause that the heap occupancy has |
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2219 // gone over the initiating threshold and we should start a |
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2220 // concurrent marking cycle. So we might initiate one. |
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2221 |
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2222 bool during_cycle = _g1->concurrent_mark()->cmThread()->during_cycle(); |
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2223 if (!during_cycle) { |
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2224 // The concurrent marking thread is not "during a cycle", i.e., |
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2225 // it has completed the last one. So we can go ahead and |
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2226 // initiate a new cycle. |
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2227 |
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2228 set_during_initial_mark_pause(); |
4710 | 2229 // We do not allow mixed GCs during marking. |
2230 if (!gcs_are_young()) { | |
2231 set_gcs_are_young(true); | |
2232 ergo_verbose0(ErgoMixedGCs, | |
2233 "end mixed GCs", | |
3982
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|
2234 ergo_format_reason("concurrent cycle is about to start")); |
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2235 } |
1359
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2236 |
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2237 // And we can now clear initiate_conc_mark_if_possible() as |
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2238 // we've already acted on it. |
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|
2239 clear_initiate_conc_mark_if_possible(); |
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|
2240 |
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2241 ergo_verbose0(ErgoConcCycles, |
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2242 "initiate concurrent cycle", |
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|
2243 ergo_format_reason("concurrent cycle initiation requested")); |
1359
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2244 } else { |
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2245 // The concurrent marking thread is still finishing up the |
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2246 // previous cycle. If we start one right now the two cycles |
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2247 // overlap. In particular, the concurrent marking thread might |
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2248 // be in the process of clearing the next marking bitmap (which |
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2249 // we will use for the next cycle if we start one). Starting a |
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2250 // cycle now will be bad given that parts of the marking |
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2251 // information might get cleared by the marking thread. And we |
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2252 // cannot wait for the marking thread to finish the cycle as it |
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2253 // periodically yields while clearing the next marking bitmap |
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2254 // and, if it's in a yield point, it's waiting for us to |
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2255 // finish. So, at this point we will not start a cycle and we'll |
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2256 // let the concurrent marking thread complete the last one. |
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2257 ergo_verbose0(ErgoConcCycles, |
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2258 "do not initiate concurrent cycle", |
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|
2259 ergo_format_reason("concurrent cycle already in progress")); |
1359
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2260 } |
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2261 } |
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2262 } |
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2263 |
342 | 2264 class KnownGarbageClosure: public HeapRegionClosure { |
2265 CollectionSetChooser* _hrSorted; | |
2266 | |
2267 public: | |
2268 KnownGarbageClosure(CollectionSetChooser* hrSorted) : | |
2269 _hrSorted(hrSorted) | |
2270 {} | |
2271 | |
2272 bool doHeapRegion(HeapRegion* r) { | |
2273 // We only include humongous regions in collection | |
2274 // sets when concurrent mark shows that their contained object is | |
2275 // unreachable. | |
2276 | |
2277 // Do we have any marking information for this region? | |
2278 if (r->is_marked()) { | |
2279 // We don't include humongous regions in collection | |
2280 // sets because we collect them immediately at the end of a marking | |
2281 // cycle. We also don't include young regions because we *must* | |
2282 // include them in the next collection pause. | |
2283 if (!r->isHumongous() && !r->is_young()) { | |
2284 _hrSorted->addMarkedHeapRegion(r); | |
2285 } | |
2286 } | |
2287 return false; | |
2288 } | |
2289 }; | |
2290 | |
2291 class ParKnownGarbageHRClosure: public HeapRegionClosure { | |
2292 CollectionSetChooser* _hrSorted; | |
2293 jint _marked_regions_added; | |
2294 jint _chunk_size; | |
2295 jint _cur_chunk_idx; | |
2296 jint _cur_chunk_end; // Cur chunk [_cur_chunk_idx, _cur_chunk_end) | |
2297 int _worker; | |
2298 int _invokes; | |
2299 | |
2300 void get_new_chunk() { | |
2301 _cur_chunk_idx = _hrSorted->getParMarkedHeapRegionChunk(_chunk_size); | |
2302 _cur_chunk_end = _cur_chunk_idx + _chunk_size; | |
2303 } | |
2304 void add_region(HeapRegion* r) { | |
2305 if (_cur_chunk_idx == _cur_chunk_end) { | |
2306 get_new_chunk(); | |
2307 } | |
2308 assert(_cur_chunk_idx < _cur_chunk_end, "postcondition"); | |
2309 _hrSorted->setMarkedHeapRegion(_cur_chunk_idx, r); | |
2310 _marked_regions_added++; | |
2311 _cur_chunk_idx++; | |
2312 } | |
2313 | |
2314 public: | |
2315 ParKnownGarbageHRClosure(CollectionSetChooser* hrSorted, | |
2316 jint chunk_size, | |
2317 int worker) : | |
2318 _hrSorted(hrSorted), _chunk_size(chunk_size), _worker(worker), | |
2319 _marked_regions_added(0), _cur_chunk_idx(0), _cur_chunk_end(0), | |
2320 _invokes(0) | |
2321 {} | |
2322 | |
2323 bool doHeapRegion(HeapRegion* r) { | |
2324 // We only include humongous regions in collection | |
2325 // sets when concurrent mark shows that their contained object is | |
2326 // unreachable. | |
2327 _invokes++; | |
2328 | |
2329 // Do we have any marking information for this region? | |
2330 if (r->is_marked()) { | |
2331 // We don't include humongous regions in collection | |
2332 // sets because we collect them immediately at the end of a marking | |
2333 // cycle. | |
2334 // We also do not include young regions in collection sets | |
2335 if (!r->isHumongous() && !r->is_young()) { | |
2336 add_region(r); | |
2337 } | |
2338 } | |
2339 return false; | |
2340 } | |
2341 jint marked_regions_added() { return _marked_regions_added; } | |
2342 int invokes() { return _invokes; } | |
2343 }; | |
2344 | |
2345 class ParKnownGarbageTask: public AbstractGangTask { | |
2346 CollectionSetChooser* _hrSorted; | |
2347 jint _chunk_size; | |
2348 G1CollectedHeap* _g1; | |
2349 public: | |
2350 ParKnownGarbageTask(CollectionSetChooser* hrSorted, jint chunk_size) : | |
2351 AbstractGangTask("ParKnownGarbageTask"), | |
2352 _hrSorted(hrSorted), _chunk_size(chunk_size), | |
2353 _g1(G1CollectedHeap::heap()) | |
2354 {} | |
2355 | |
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2356 void work(uint worker_id) { |
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2357 ParKnownGarbageHRClosure parKnownGarbageCl(_hrSorted, |
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2358 _chunk_size, |
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2359 worker_id); |
342 | 2360 // Back to zero for the claim value. |
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2361 _g1->heap_region_par_iterate_chunked(&parKnownGarbageCl, worker_id, |
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2362 _g1->workers()->active_workers(), |
355 | 2363 HeapRegion::InitialClaimValue); |
342 | 2364 jint regions_added = parKnownGarbageCl.marked_regions_added(); |
2365 _hrSorted->incNumMarkedHeapRegions(regions_added); | |
2366 if (G1PrintParCleanupStats) { | |
2363
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2367 gclog_or_tty->print_cr(" Thread %d called %d times, added %d regions to list.", |
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2368 worker_id, parKnownGarbageCl.invokes(), regions_added); |
342 | 2369 } |
2370 } | |
2371 }; | |
2372 | |
2373 void | |
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2374 G1CollectorPolicy::record_concurrent_mark_cleanup_end(int no_of_gc_threads) { |
4013 | 2375 double start_sec; |
2376 if (G1PrintParCleanupStats) { | |
2377 start_sec = os::elapsedTime(); | |
2378 } | |
342 | 2379 |
2380 _collectionSetChooser->clearMarkedHeapRegions(); | |
4013 | 2381 double clear_marked_end_sec; |
342 | 2382 if (G1PrintParCleanupStats) { |
4013 | 2383 clear_marked_end_sec = os::elapsedTime(); |
2384 gclog_or_tty->print_cr(" clear marked regions: %8.3f ms.", | |
2385 (clear_marked_end_sec - start_sec) * 1000.0); | |
342 | 2386 } |
4013 | 2387 |
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2388 if (G1CollectedHeap::use_parallel_gc_threads()) { |
342 | 2389 const size_t OverpartitionFactor = 4; |
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2390 size_t WorkUnit; |
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2391 // The use of MinChunkSize = 8 in the original code |
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2392 // causes some assertion failures when the total number of |
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2393 // region is less than 8. The code here tries to fix that. |
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2394 // Should the original code also be fixed? |
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2395 if (no_of_gc_threads > 0) { |
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2396 const size_t MinWorkUnit = |
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2397 MAX2(_g1->n_regions() / no_of_gc_threads, (size_t) 1U); |
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2398 WorkUnit = |
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2399 MAX2(_g1->n_regions() / (no_of_gc_threads * OverpartitionFactor), |
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2400 MinWorkUnit); |
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2401 } else { |
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2402 assert(no_of_gc_threads > 0, |
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2403 "The active gc workers should be greater than 0"); |
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2404 // In a product build do something reasonable to avoid a crash. |
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2405 const size_t MinWorkUnit = |
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2406 MAX2(_g1->n_regions() / ParallelGCThreads, (size_t) 1U); |
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2407 WorkUnit = |
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2408 MAX2(_g1->n_regions() / (ParallelGCThreads * OverpartitionFactor), |
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2409 MinWorkUnit); |
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2410 } |
342 | 2411 _collectionSetChooser->prepareForAddMarkedHeapRegionsPar(_g1->n_regions(), |
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2412 WorkUnit); |
342 | 2413 ParKnownGarbageTask parKnownGarbageTask(_collectionSetChooser, |
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2414 (int) WorkUnit); |
342 | 2415 _g1->workers()->run_task(&parKnownGarbageTask); |
355 | 2416 |
2417 assert(_g1->check_heap_region_claim_values(HeapRegion::InitialClaimValue), | |
2418 "sanity check"); | |
342 | 2419 } else { |
2420 KnownGarbageClosure knownGarbagecl(_collectionSetChooser); | |
2421 _g1->heap_region_iterate(&knownGarbagecl); | |
2422 } | |
4013 | 2423 double known_garbage_end_sec; |
342 | 2424 if (G1PrintParCleanupStats) { |
4013 | 2425 known_garbage_end_sec = os::elapsedTime(); |
342 | 2426 gclog_or_tty->print_cr(" compute known garbage: %8.3f ms.", |
4013 | 2427 (known_garbage_end_sec - clear_marked_end_sec) * 1000.0); |
342 | 2428 } |
4013 | 2429 |
342 | 2430 _collectionSetChooser->sortMarkedHeapRegions(); |
4013 | 2431 double end_sec = os::elapsedTime(); |
342 | 2432 if (G1PrintParCleanupStats) { |
2433 gclog_or_tty->print_cr(" sorting: %8.3f ms.", | |
4013 | 2434 (end_sec - known_garbage_end_sec) * 1000.0); |
342 | 2435 } |
2436 | |
4013 | 2437 double elapsed_time_ms = (end_sec - _mark_cleanup_start_sec) * 1000.0; |
2438 _concurrent_mark_cleanup_times_ms->add(elapsed_time_ms); | |
2439 _cur_mark_stop_world_time_ms += elapsed_time_ms; | |
2440 _prev_collection_pause_end_ms += elapsed_time_ms; | |
2441 _mmu_tracker->add_pause(_mark_cleanup_start_sec, end_sec, true); | |
342 | 2442 } |
2443 | |
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2444 // Add the heap region at the head of the non-incremental collection set |
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2445 void G1CollectorPolicy::add_old_region_to_cset(HeapRegion* hr) { |
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2446 assert(_inc_cset_build_state == Active, "Precondition"); |
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2447 assert(!hr->is_young(), "non-incremental add of young region"); |
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2448 |
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2449 assert(!hr->in_collection_set(), "should not already be in the CSet"); |
342 | 2450 hr->set_in_collection_set(true); |
2451 hr->set_next_in_collection_set(_collection_set); | |
2452 _collection_set = hr; | |
2453 _collection_set_bytes_used_before += hr->used(); | |
526 | 2454 _g1->register_region_with_in_cset_fast_test(hr); |
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2455 size_t rs_length = hr->rem_set()->occupied(); |
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2456 _recorded_rs_lengths += rs_length; |
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2457 _old_cset_region_length += 1; |
342 | 2458 } |
2459 | |
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2460 // Initialize the per-collection-set information |
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2461 void G1CollectorPolicy::start_incremental_cset_building() { |
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2462 assert(_inc_cset_build_state == Inactive, "Precondition"); |
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2463 |
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2464 _inc_cset_head = NULL; |
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2465 _inc_cset_tail = NULL; |
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2466 _inc_cset_bytes_used_before = 0; |
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2467 |
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2468 _inc_cset_max_finger = 0; |
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2469 _inc_cset_recorded_rs_lengths = 0; |
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2470 _inc_cset_recorded_rs_lengths_diffs = 0; |
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2471 _inc_cset_predicted_elapsed_time_ms = 0.0; |
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2472 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
1394
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2473 _inc_cset_build_state = Active; |
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2474 } |
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2475 |
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2476 void G1CollectorPolicy::finalize_incremental_cset_building() { |
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2477 assert(_inc_cset_build_state == Active, "Precondition"); |
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2478 assert(SafepointSynchronize::is_at_safepoint(), "should be at a safepoint"); |
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2479 |
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2480 // The two "main" fields, _inc_cset_recorded_rs_lengths and |
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2481 // _inc_cset_predicted_elapsed_time_ms, are updated by the thread |
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2482 // that adds a new region to the CSet. Further updates by the |
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2483 // concurrent refinement thread that samples the young RSet lengths |
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2484 // are accumulated in the *_diffs fields. Here we add the diffs to |
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2485 // the "main" fields. |
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2486 |
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2487 if (_inc_cset_recorded_rs_lengths_diffs >= 0) { |
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2488 _inc_cset_recorded_rs_lengths += _inc_cset_recorded_rs_lengths_diffs; |
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2489 } else { |
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2490 // This is defensive. The diff should in theory be always positive |
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2491 // as RSets can only grow between GCs. However, given that we |
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2492 // sample their size concurrently with other threads updating them |
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2493 // it's possible that we might get the wrong size back, which |
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2494 // could make the calculations somewhat inaccurate. |
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|
2495 size_t diffs = (size_t) (-_inc_cset_recorded_rs_lengths_diffs); |
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2496 if (_inc_cset_recorded_rs_lengths >= diffs) { |
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|
2497 _inc_cset_recorded_rs_lengths -= diffs; |
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|
2498 } else { |
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|
2499 _inc_cset_recorded_rs_lengths = 0; |
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|
2500 } |
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|
2501 } |
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|
2502 _inc_cset_predicted_elapsed_time_ms += |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2503 _inc_cset_predicted_elapsed_time_ms_diffs; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
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|
2504 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2505 _inc_cset_recorded_rs_lengths_diffs = 0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2506 _inc_cset_predicted_elapsed_time_ms_diffs = 0.0; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
changeset
|
2507 } |
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7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
changeset
|
2508 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2509 void G1CollectorPolicy::add_to_incremental_cset_info(HeapRegion* hr, size_t 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
|
2510 // This routine is used when: |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2511 // * adding survivor regions to the incremental cset at the end of an |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2512 // evacuation pause, |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2513 // * adding the current allocation region to the incremental cset |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2514 // when it is retired, and |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2515 // * updating existing policy information for a region in the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2516 // incremental cset via young list RSet sampling. |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2517 // Therefore this routine may be called at a safepoint by the |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2518 // VM thread, or in-between safepoints by mutator threads (when |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2519 // retiring the current allocation region) or a concurrent |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2520 // refine thread (RSet sampling). |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2521 |
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
|
2522 double region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2523 size_t used_bytes = hr->used(); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2524 _inc_cset_recorded_rs_lengths += 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
|
2525 _inc_cset_predicted_elapsed_time_ms += region_elapsed_time_ms; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2526 _inc_cset_bytes_used_before += used_bytes; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2527 |
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
|
2528 // Cache the values we have added to the aggregated informtion |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2529 // 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
|
2530 // 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:
1391
diff
changeset
|
2531 // rset sampling code |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2532 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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diff
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|
2533 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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1391
diff
changeset
|
2534 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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diff
changeset
|
2535 |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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diff
changeset
|
2536 void G1CollectorPolicy::update_incremental_cset_info(HeapRegion* hr, |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
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|
2537 size_t new_rs_length) { |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
changeset
|
2538 // Update the CSet information that is dependent on the new RS length |
67fdcb391461
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parents:
4710
diff
changeset
|
2539 assert(hr->is_young(), "Precondition"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
changeset
|
2540 assert(!SafepointSynchronize::is_at_safepoint(), |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
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|
2541 "should not be at a safepoint"); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
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diff
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|
2542 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
changeset
|
2543 // We could have updated _inc_cset_recorded_rs_lengths and |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
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|
2544 // _inc_cset_predicted_elapsed_time_ms directly but we'd need to do |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2545 // that atomically, as this code is executed by a concurrent |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
changeset
|
2546 // refinement thread, potentially concurrently with a mutator thread |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2547 // allocating a new region and also updating the same fields. To |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2548 // avoid the atomic operations we accumulate these updates on two |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2549 // separate fields (*_diffs) and we'll just add them to the "main" |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2550 // fields at the start of a GC. |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2551 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2552 ssize_t old_rs_length = (ssize_t) hr->recorded_rs_length(); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2553 ssize_t rs_lengths_diff = (ssize_t) new_rs_length - old_rs_length; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2554 _inc_cset_recorded_rs_lengths_diffs += rs_lengths_diff; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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parents:
4710
diff
changeset
|
2555 |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2556 double old_elapsed_time_ms = hr->predicted_elapsed_time_ms(); |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2557 double new_region_elapsed_time_ms = predict_region_elapsed_time_ms(hr, true); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
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diff
changeset
|
2558 double elapsed_ms_diff = new_region_elapsed_time_ms - old_elapsed_time_ms; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2559 _inc_cset_predicted_elapsed_time_ms_diffs += elapsed_ms_diff; |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2560 |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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4710
diff
changeset
|
2561 hr->set_recorded_rs_length(new_rs_length); |
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
tonyp
parents:
4710
diff
changeset
|
2562 hr->set_predicted_elapsed_time_ms(new_region_elapsed_time_ms); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2563 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2564 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2565 void G1CollectorPolicy::add_region_to_incremental_cset_common(HeapRegion* hr) { |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2566 assert(hr->is_young(), "invariant"); |
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
tonyp
parents:
4072
diff
changeset
|
2567 assert(hr->young_index_in_cset() > -1, "should have already been set"); |
1394
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2568 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
|
2569 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2570 // 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
|
2571 // 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
|
2572 // 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
|
2573 // 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
|
2574 // 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
|
2575 // 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
|
2576 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2577 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
|
2578 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
|
2579 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
johnc
parents:
1391
diff
changeset
|
2580 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
|
2581 _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
|
2582 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2583 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
|
2584 hr->set_in_collection_set(true); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2585 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
|
2586 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2587 _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
|
2588 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2589 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2590 // 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
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parents:
1391
diff
changeset
|
2591 void G1CollectorPolicy::add_region_to_incremental_cset_rhs(HeapRegion* hr) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2592 // 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
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parents:
1391
diff
changeset
|
2593 assert( hr->is_survivor(), "Logic"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2594 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2595 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2596 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2597 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2598 // Now add the region at the right hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2599 if (_inc_cset_tail == NULL) { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2600 assert(_inc_cset_head == NULL, "invariant"); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2601 _inc_cset_head = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2602 } else { |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2603 _inc_cset_tail->set_next_in_collection_set(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2604 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2605 _inc_cset_tail = hr; |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2606 } |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2607 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2608 // 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
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parents:
1391
diff
changeset
|
2609 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
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parents:
1391
diff
changeset
|
2610 // Survivors should be added to the RHS at the end of a pause |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2611 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
|
2612 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2613 // Do the 'common' stuff |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2614 add_region_to_incremental_cset_common(hr); |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2615 |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2616 // Add the region at the left hand side |
1316cec51b4d
6819061: G1: eliminate serial Other times that are proportional to the collection set length
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parents:
1391
diff
changeset
|
2617 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
|
2618 if (_inc_cset_head == NULL) { |
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2619 assert(_inc_cset_tail == NULL, "Invariant"); |
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2620 _inc_cset_tail = hr; |
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|
2621 } |
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2622 _inc_cset_head = hr; |
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|
2623 } |
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|
2624 |
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|
2625 #ifndef PRODUCT |
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|
2626 void G1CollectorPolicy::print_collection_set(HeapRegion* list_head, outputStream* st) { |
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|
2627 assert(list_head == inc_cset_head() || list_head == collection_set(), "must be"); |
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|
2628 |
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|
2629 st->print_cr("\nCollection_set:"); |
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2630 HeapRegion* csr = list_head; |
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2631 while (csr != NULL) { |
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2632 HeapRegion* next = csr->next_in_collection_set(); |
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|
2633 assert(csr->in_collection_set(), "bad CS"); |
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2634 st->print_cr(" [%08x-%08x], t: %08x, P: %08x, N: %08x, C: %08x, " |
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2635 "age: %4d, y: %d, surv: %d", |
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2636 csr->bottom(), csr->end(), |
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|
2637 csr->top(), |
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|
2638 csr->prev_top_at_mark_start(), |
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|
2639 csr->next_top_at_mark_start(), |
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|
2640 csr->top_at_conc_mark_count(), |
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|
2641 csr->age_in_surv_rate_group_cond(), |
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|
2642 csr->is_young(), |
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|
2643 csr->is_survivor()); |
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|
2644 csr = next; |
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|
2645 } |
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|
2646 } |
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|
2647 #endif // !PRODUCT |
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|
2648 |
4013 | 2649 void G1CollectorPolicy::choose_collection_set(double target_pause_time_ms) { |
1394
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2650 // Set this here - in case we're not doing young collections. |
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2651 double non_young_start_time_sec = os::elapsedTime(); |
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|
2652 |
3914
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|
2653 YoungList* young_list = _g1->young_list(); |
4727
67fdcb391461
7119027: G1: use atomics to update RS length / predict time of inc CSet
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|
2654 finalize_incremental_cset_building(); |
3914
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|
2655 |
1656
4e5661ba9d98
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|
2656 guarantee(target_pause_time_ms > 0.0, |
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|
2657 err_msg("target_pause_time_ms = %1.6lf should be positive", |
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|
2658 target_pause_time_ms)); |
4e5661ba9d98
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|
2659 guarantee(_collection_set == NULL, "Precondition"); |
342 | 2660 |
2661 double base_time_ms = predict_base_elapsed_time_ms(_pending_cards); | |
2662 double predicted_pause_time_ms = base_time_ms; | |
2663 | |
1656
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|
2664 double time_remaining_ms = target_pause_time_ms - base_time_ms; |
342 | 2665 |
3914
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|
2666 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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|
2667 "start choosing CSet", |
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|
2668 ergo_format_ms("predicted base time") |
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|
2669 ergo_format_ms("remaining time") |
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|
2670 ergo_format_ms("target pause time"), |
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|
2671 base_time_ms, time_remaining_ms, target_pause_time_ms); |
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|
2672 |
342 | 2673 // the 10% and 50% values are arbitrary... |
3914
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|
2674 double threshold = 0.10 * target_pause_time_ms; |
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|
2675 if (time_remaining_ms < threshold) { |
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|
2676 double prev_time_remaining_ms = time_remaining_ms; |
1656
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|
2677 time_remaining_ms = 0.50 * target_pause_time_ms; |
3914
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|
2678 ergo_verbose3(ErgoCSetConstruction, |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2679 "adjust remaining time", |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2680 ergo_format_reason("remaining time lower than threshold") |
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|
2681 ergo_format_ms("remaining time") |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2682 ergo_format_ms("threshold") |
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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|
2683 ergo_format_ms("adjusted remaining time"), |
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|
2684 prev_time_remaining_ms, threshold, time_remaining_ms); |
342 | 2685 } |
2686 | |
3914
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|
2687 size_t expansion_bytes = _g1->expansion_regions() * HeapRegion::GrainBytes; |
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|
2688 |
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|
2689 HeapRegion* hr; |
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|
2690 double young_start_time_sec = os::elapsedTime(); |
342 | 2691 |
677 | 2692 _collection_set_bytes_used_before = 0; |
4710 | 2693 _last_gc_was_young = gcs_are_young() ? true : false; |
2694 | |
2695 if (_last_gc_was_young) { | |
2696 ++_young_pause_num; | |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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diff
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|
2697 } else { |
4710 | 2698 ++_mixed_pause_num; |
3914
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|
2699 } |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
changeset
|
2700 |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
2701 // The young list is laid with the survivor regions from the previous |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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diff
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|
2702 // pause are appended to the RHS of the young list, i.e. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
2703 // [Newly Young Regions ++ Survivors from last pause]. |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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|
2704 |
4090
a88de71c4e3a
7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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4072
diff
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|
2705 size_t survivor_region_length = young_list->survivor_length(); |
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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diff
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|
2706 size_t eden_region_length = young_list->length() - survivor_region_length; |
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7097002: G1: remove a lot of unused / redundant code from the G1CollectorPolicy class
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diff
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|
2707 init_cset_region_lengths(eden_region_length, survivor_region_length); |
3914
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7050392: G1: Introduce flag to generate a log of the G1 ergonomic decisions
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3868
diff
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|
2708 hr = young_list->first_survivor_region(); |
3867
ff53346271fe
6814390: G1: remove the concept of non-generational G1
brutisso
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3830
diff
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|
2709 while (hr != NULL) { |
ff53346271fe
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diff
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|
2710 assert(hr->is_survivor(), "badly formed young list"); |
ff53346271fe
6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
2711 hr->set_young(); |
ff53346271fe
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3830
diff
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|
2712 hr = hr->get_next_young_region(); |
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6814390: G1: remove the concept of non-generational G1
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3830
diff
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|
2713 } |
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diff
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|
2714 |
3914
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diff
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|
2715 // Clear the fields that point to the survivor list - they are all young now. |
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|
2716 young_list->clear_survivors(); |
3867
ff53346271fe
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|
2717 |
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diff
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|
2718 _collection_set = _inc_cset_head; |
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|
2719 _collection_set_bytes_used_before = _inc_cset_bytes_used_before; |
ff53346271fe
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|
2720 time_remaining_ms -= _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
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|
2721 predicted_pause_time_ms += _inc_cset_predicted_elapsed_time_ms; |
ff53346271fe
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|
2722 |
3914
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|
2723 ergo_verbose3(ErgoCSetConstruction | ErgoHigh, |
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3868
diff
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|
2724 "add young regions to CSet", |
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|
2725 ergo_format_region("eden") |
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|
2726 ergo_format_region("survivors") |
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diff
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|
2727 ergo_format_ms("predicted young region time"), |
4090
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|
2728 eden_region_length, survivor_region_length, |
3914
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|
2729 _inc_cset_predicted_elapsed_time_ms); |
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|
2730 |
3867
ff53346271fe
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diff
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|
2731 // The number of recorded young regions is the incremental |
ff53346271fe
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|
2732 // collection set's current size |
ff53346271fe
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|
2733 set_recorded_rs_lengths(_inc_cset_recorded_rs_lengths); |
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|
2734 |
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|
2735 double young_end_time_sec = os::elapsedTime(); |
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|
2736 _recorded_young_cset_choice_time_ms = |
ff53346271fe
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|
2737 (young_end_time_sec - young_start_time_sec) * 1000.0; |
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|
2738 |
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|
2739 // We are doing young collections so reset this. |
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|
2740 non_young_start_time_sec = young_end_time_sec; |
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diff
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|
2741 |
4710 | 2742 if (!gcs_are_young()) { |
342 | 2743 bool should_continue = true; |
2744 NumberSeq seq; | |
2745 double avg_prediction = 100000000000000000.0; // something very large | |
1394
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|
2746 |
3914
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changeset
|
2747 double prev_predicted_pause_time_ms = predicted_pause_time_ms; |
342 | 2748 do { |
4090
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|
2749 // Note that add_old_region_to_cset() increments the |
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|
2750 // _old_cset_region_length field and cset_region_length() returns the |
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2751 // sum of _eden_cset_region_length, _survivor_cset_region_length, and |
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2752 // _old_cset_region_length. So, as old regions are added to the |
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2753 // CSet, _old_cset_region_length will be incremented and |
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2754 // cset_region_length(), which is used below, will always reflect |
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2755 // the the total number of regions added up to this point to the CSet. |
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2756 |
342 | 2757 hr = _collectionSetChooser->getNextMarkedRegion(time_remaining_ms, |
2758 avg_prediction); | |
677 | 2759 if (hr != NULL) { |
4072 | 2760 _g1->old_set_remove(hr); |
342 | 2761 double predicted_time_ms = predict_region_elapsed_time_ms(hr, false); |
2762 time_remaining_ms -= predicted_time_ms; | |
2763 predicted_pause_time_ms += predicted_time_ms; | |
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2764 add_old_region_to_cset(hr); |
342 | 2765 seq.add(predicted_time_ms); |
2766 avg_prediction = seq.avg() + seq.sd(); | |
2767 } | |
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2768 |
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2769 should_continue = true; |
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2770 if (hr == NULL) { |
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2771 // No need for an ergo verbose message here, |
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2772 // getNextMarkRegion() does this when it returns NULL. |
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2773 should_continue = false; |
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2774 } else { |
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2775 if (adaptive_young_list_length()) { |
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2776 if (time_remaining_ms < 0.0) { |
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2777 ergo_verbose1(ErgoCSetConstruction, |
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2778 "stop adding old regions to CSet", |
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2779 ergo_format_reason("remaining time is lower than 0") |
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2780 ergo_format_ms("remaining time"), |
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2781 time_remaining_ms); |
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2782 should_continue = false; |
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2783 } |
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2784 } else { |
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2785 if (cset_region_length() >= _young_list_fixed_length) { |
3914
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2786 ergo_verbose2(ErgoCSetConstruction, |
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2787 "stop adding old regions to CSet", |
3927
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2788 ergo_format_reason("CSet length reached target") |
3914
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2789 ergo_format_region("CSet") |
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2790 ergo_format_region("young target"), |
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2791 cset_region_length(), _young_list_fixed_length); |
3914
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2792 should_continue = false; |
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2793 } |
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2794 } |
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2795 } |
342 | 2796 } while (should_continue); |
2797 | |
2798 if (!adaptive_young_list_length() && | |
4710 | 2799 cset_region_length() < _young_list_fixed_length) { |
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2800 ergo_verbose2(ErgoCSetConstruction, |
4710 | 2801 "request mixed GCs end", |
3914
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2802 ergo_format_reason("CSet length lower than target") |
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2803 ergo_format_region("CSet") |
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2804 ergo_format_region("young target"), |
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2805 cset_region_length(), _young_list_fixed_length); |
4710 | 2806 _should_revert_to_young_gcs = true; |
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2807 } |
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2808 |
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2809 ergo_verbose2(ErgoCSetConstruction | ErgoHigh, |
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2810 "add old regions to CSet", |
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2811 ergo_format_region("old") |
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2812 ergo_format_ms("predicted old region time"), |
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2813 old_cset_region_length(), |
3914
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2814 predicted_pause_time_ms - prev_predicted_pause_time_ms); |
342 | 2815 } |
2816 | |
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2817 stop_incremental_cset_building(); |
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2818 |
342 | 2819 count_CS_bytes_used(); |
2820 | |
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2821 ergo_verbose5(ErgoCSetConstruction, |
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2822 "finish choosing CSet", |
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2823 ergo_format_region("eden") |
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2824 ergo_format_region("survivors") |
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2825 ergo_format_region("old") |
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2826 ergo_format_ms("predicted pause time") |
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2827 ergo_format_ms("target pause time"), |
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2828 eden_region_length, survivor_region_length, |
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2829 old_cset_region_length(), |
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2830 predicted_pause_time_ms, target_pause_time_ms); |
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2831 |
342 | 2832 double non_young_end_time_sec = os::elapsedTime(); |
2833 _recorded_non_young_cset_choice_time_ms = | |
2834 (non_young_end_time_sec - non_young_start_time_sec) * 1000.0; | |
2835 } |